* [PATCH v2 01/53] fscache_old: Move the old fscache driver to one side
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
@ 2021-10-22 18:58 ` David Howells
2021-10-22 18:59 ` [PATCH v2 02/53] fscache_old: Rename CONFIG_FSCACHE* to CONFIG_FSCACHE_OLD* David Howells
` (53 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 18:58 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Move the old fscache driver to fs/fscache_old/ and rename its header files
to match. This leaves fs/fscache/ free for a rewritten driver.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/9p/cache.h | 2
fs/Kconfig | 2
fs/Makefile | 2
fs/afs/internal.h | 2
fs/afs/write.c | 2
fs/cachefiles/internal.h | 2
fs/ceph/super.h | 2
fs/cifs/fscache.h | 2
fs/fscache/Kconfig | 40 -
fs/fscache/Makefile | 20 -
fs/fscache/cache.c | 410 -------------
fs/fscache/cookie.c | 1061 ----------------------------------
fs/fscache/fsdef.c | 98 ---
fs/fscache/internal.h | 409 -------------
fs/fscache/io.c | 224 -------
fs/fscache/main.c | 230 -------
fs/fscache/netfs.c | 74 --
fs/fscache/object.c | 1123 ------------------------------------
fs/fscache/operation.c | 633 --------------------
fs/fscache/page.c | 176 ------
fs/fscache/proc.c | 71 --
fs/fscache/stats.c | 226 -------
fs/fscache_old/Kconfig | 40 +
fs/fscache_old/Makefile | 20 +
fs/fscache_old/cache.c | 410 +++++++++++++
fs/fscache_old/cookie.c | 1061 ++++++++++++++++++++++++++++++++++
fs/fscache_old/fsdef.c | 98 +++
fs/fscache_old/internal.h | 409 +++++++++++++
fs/fscache_old/io.c | 224 +++++++
fs/fscache_old/main.c | 230 +++++++
fs/fscache_old/netfs.c | 74 ++
fs/fscache_old/object.c | 1123 ++++++++++++++++++++++++++++++++++++
fs/fscache_old/operation.c | 633 ++++++++++++++++++++
fs/fscache_old/page.c | 92 +++
fs/fscache_old/proc.c | 71 ++
fs/fscache_old/stats.c | 226 +++++++
fs/nfs/fscache.h | 2
include/linux/fscache-cache.h | 434 --------------
include/linux/fscache.h | 645 ---------------------
include/linux/fscache_old-cache.h | 434 ++++++++++++++
include/linux/fscache_old.h | 645 +++++++++++++++++++++
include/trace/events/fscache.h | 523 -----------------
include/trace/events/fscache_old.h | 523 +++++++++++++++++
43 files changed, 6322 insertions(+), 6406 deletions(-)
delete mode 100644 fs/fscache/Kconfig
delete mode 100644 fs/fscache/Makefile
delete mode 100644 fs/fscache/cache.c
delete mode 100644 fs/fscache/cookie.c
delete mode 100644 fs/fscache/fsdef.c
delete mode 100644 fs/fscache/internal.h
delete mode 100644 fs/fscache/io.c
delete mode 100644 fs/fscache/main.c
delete mode 100644 fs/fscache/netfs.c
delete mode 100644 fs/fscache/object.c
delete mode 100644 fs/fscache/operation.c
delete mode 100644 fs/fscache/page.c
delete mode 100644 fs/fscache/proc.c
delete mode 100644 fs/fscache/stats.c
create mode 100644 fs/fscache_old/Kconfig
create mode 100644 fs/fscache_old/Makefile
create mode 100644 fs/fscache_old/cache.c
create mode 100644 fs/fscache_old/cookie.c
create mode 100644 fs/fscache_old/fsdef.c
create mode 100644 fs/fscache_old/internal.h
create mode 100644 fs/fscache_old/io.c
create mode 100644 fs/fscache_old/main.c
create mode 100644 fs/fscache_old/netfs.c
create mode 100644 fs/fscache_old/object.c
create mode 100644 fs/fscache_old/operation.c
create mode 100644 fs/fscache_old/page.c
create mode 100644 fs/fscache_old/proc.c
create mode 100644 fs/fscache_old/stats.c
delete mode 100644 include/linux/fscache-cache.h
delete mode 100644 include/linux/fscache.h
create mode 100644 include/linux/fscache_old-cache.h
create mode 100644 include/linux/fscache_old.h
delete mode 100644 include/trace/events/fscache.h
create mode 100644 include/trace/events/fscache_old.h
diff --git a/fs/9p/cache.h b/fs/9p/cache.h
index cfafa89b972c..b940c5ffd9e3 100644
--- a/fs/9p/cache.h
+++ b/fs/9p/cache.h
@@ -9,7 +9,7 @@
#define _9P_CACHE_H
#define FSCACHE_USE_NEW_IO_API
-#include <linux/fscache.h>
+#include <linux/fscache_old.h>
#ifdef CONFIG_9P_FSCACHE
diff --git a/fs/Kconfig b/fs/Kconfig
index a6313a969bc5..966361e471bc 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -131,7 +131,7 @@ source "fs/overlayfs/Kconfig"
menu "Caches"
source "fs/netfs/Kconfig"
-source "fs/fscache/Kconfig"
+source "fs/fscache_old/Kconfig"
source "fs/cachefiles/Kconfig"
endmenu
diff --git a/fs/Makefile b/fs/Makefile
index 84c5e4cdfee5..8b87c9406ecc 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -67,7 +67,7 @@ obj-$(CONFIG_DLM) += dlm/
# Do not add any filesystems before this line
obj-$(CONFIG_NETFS_SUPPORT) += netfs/
-obj-$(CONFIG_FSCACHE) += fscache/
+obj-$(CONFIG_FSCACHE) += fscache_old/
obj-$(CONFIG_REISERFS_FS) += reiserfs/
obj-$(CONFIG_EXT4_FS) += ext4/
# We place ext4 before ext2 so that clean ext3 root fs's do NOT mount using the
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 0ad97a8fc0d4..a70451bf5b33 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -15,7 +15,7 @@
#include <linux/workqueue.h>
#include <linux/sched.h>
#define FSCACHE_USE_NEW_IO_API
-#include <linux/fscache.h>
+#include <linux/fscache_old.h>
#include <linux/backing-dev.h>
#include <linux/uuid.h>
#include <linux/mm_types.h>
diff --git a/fs/afs/write.c b/fs/afs/write.c
index f24370f5c774..8e9cb1fcb412 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -12,7 +12,7 @@
#include <linux/writeback.h>
#include <linux/pagevec.h>
#include <linux/netfs.h>
-#include <linux/fscache.h>
+#include <linux/fscache_old.h>
#include "internal.h"
/*
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index de982f4f513f..7dee24d1c6f2 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -12,7 +12,7 @@
#define pr_fmt(fmt) "CacheFiles: " fmt
-#include <linux/fscache-cache.h>
+#include <linux/fscache_old-cache.h>
#include <linux/timer.h>
#include <linux/wait_bit.h>
#include <linux/cred.h>
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index a40eb14c282a..b523dc41ff36 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -22,7 +22,7 @@
#ifdef CONFIG_CEPH_FSCACHE
#define FSCACHE_USE_NEW_IO_API
-#include <linux/fscache.h>
+#include <linux/fscache_old.h>
#endif
/* f_type in struct statfs */
diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h
index 081481645b77..704c7354ace1 100644
--- a/fs/cifs/fscache.h
+++ b/fs/cifs/fscache.h
@@ -10,7 +10,7 @@
#define _CIFS_FSCACHE_H
#define FSCACHE_USE_FALLBACK_IO_API
-#include <linux/fscache.h>
+#include <linux/fscache_old.h>
#include "cifsglob.h"
diff --git a/fs/fscache/Kconfig b/fs/fscache/Kconfig
deleted file mode 100644
index b313a978ae0a..000000000000
--- a/fs/fscache/Kconfig
+++ /dev/null
@@ -1,40 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-
-config FSCACHE
- tristate "General filesystem local caching manager"
- select NETFS_SUPPORT
- help
- This option enables a generic filesystem caching manager that can be
- used by various network and other filesystems to cache data locally.
- Different sorts of caches can be plugged in, depending on the
- resources available.
-
- See Documentation/filesystems/caching/fscache.rst for more information.
-
-config FSCACHE_STATS
- bool "Gather statistical information on local caching"
- depends on FSCACHE && PROC_FS
- select NETFS_STATS
- help
- This option causes statistical information to be gathered on local
- caching and exported through file:
-
- /proc/fs/fscache/stats
-
- The gathering of statistics adds a certain amount of overhead to
- execution as there are a quite a few stats gathered, and on a
- multi-CPU system these may be on cachelines that keep bouncing
- between CPUs. On the other hand, the stats are very useful for
- debugging purposes. Saying 'Y' here is recommended.
-
- See Documentation/filesystems/caching/fscache.rst for more information.
-
-config FSCACHE_DEBUG
- bool "Debug FS-Cache"
- depends on FSCACHE
- help
- This permits debugging to be dynamically enabled in the local caching
- management module. If this is set, the debugging output may be
- enabled by setting bits in /sys/modules/fscache/parameter/debug.
-
- See Documentation/filesystems/caching/fscache.rst for more information.
diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile
deleted file mode 100644
index 03a871d689bb..000000000000
--- a/fs/fscache/Makefile
+++ /dev/null
@@ -1,20 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for general filesystem caching code
-#
-
-fscache-y := \
- cache.o \
- cookie.o \
- fsdef.o \
- io.o \
- main.o \
- netfs.o \
- object.o \
- operation.o \
- page.o
-
-fscache-$(CONFIG_PROC_FS) += proc.o
-fscache-$(CONFIG_FSCACHE_STATS) += stats.o
-
-obj-$(CONFIG_FSCACHE) := fscache.o
diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
deleted file mode 100644
index cfa60c2faf68..000000000000
--- a/fs/fscache/cache.c
+++ /dev/null
@@ -1,410 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache cache handling
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL CACHE
-#include <linux/module.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-LIST_HEAD(fscache_cache_list);
-DECLARE_RWSEM(fscache_addremove_sem);
-DECLARE_WAIT_QUEUE_HEAD(fscache_cache_cleared_wq);
-EXPORT_SYMBOL(fscache_cache_cleared_wq);
-
-static LIST_HEAD(fscache_cache_tag_list);
-
-/*
- * look up a cache tag
- */
-struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *name)
-{
- struct fscache_cache_tag *tag, *xtag;
-
- /* firstly check for the existence of the tag under read lock */
- down_read(&fscache_addremove_sem);
-
- list_for_each_entry(tag, &fscache_cache_tag_list, link) {
- if (strcmp(tag->name, name) == 0) {
- atomic_inc(&tag->usage);
- up_read(&fscache_addremove_sem);
- return tag;
- }
- }
-
- up_read(&fscache_addremove_sem);
-
- /* the tag does not exist - create a candidate */
- xtag = kzalloc(sizeof(*xtag) + strlen(name) + 1, GFP_KERNEL);
- if (!xtag)
- /* return a dummy tag if out of memory */
- return ERR_PTR(-ENOMEM);
-
- atomic_set(&xtag->usage, 1);
- strcpy(xtag->name, name);
-
- /* write lock, search again and add if still not present */
- down_write(&fscache_addremove_sem);
-
- list_for_each_entry(tag, &fscache_cache_tag_list, link) {
- if (strcmp(tag->name, name) == 0) {
- atomic_inc(&tag->usage);
- up_write(&fscache_addremove_sem);
- kfree(xtag);
- return tag;
- }
- }
-
- list_add_tail(&xtag->link, &fscache_cache_tag_list);
- up_write(&fscache_addremove_sem);
- return xtag;
-}
-
-/*
- * release a reference to a cache tag
- */
-void __fscache_release_cache_tag(struct fscache_cache_tag *tag)
-{
- if (tag != ERR_PTR(-ENOMEM)) {
- down_write(&fscache_addremove_sem);
-
- if (atomic_dec_and_test(&tag->usage))
- list_del_init(&tag->link);
- else
- tag = NULL;
-
- up_write(&fscache_addremove_sem);
-
- kfree(tag);
- }
-}
-
-/*
- * select a cache in which to store an object
- * - the cache addremove semaphore must be at least read-locked by the caller
- * - the object will never be an index
- */
-struct fscache_cache *fscache_select_cache_for_object(
- struct fscache_cookie *cookie)
-{
- struct fscache_cache_tag *tag;
- struct fscache_object *object;
- struct fscache_cache *cache;
-
- _enter("");
-
- if (list_empty(&fscache_cache_list)) {
- _leave(" = NULL [no cache]");
- return NULL;
- }
-
- /* we check the parent to determine the cache to use */
- spin_lock(&cookie->lock);
-
- /* the first in the parent's backing list should be the preferred
- * cache */
- if (!hlist_empty(&cookie->backing_objects)) {
- object = hlist_entry(cookie->backing_objects.first,
- struct fscache_object, cookie_link);
-
- cache = object->cache;
- if (fscache_object_is_dying(object) ||
- test_bit(FSCACHE_IOERROR, &cache->flags))
- cache = NULL;
-
- spin_unlock(&cookie->lock);
- _leave(" = %s [parent]", cache ? cache->tag->name : "NULL");
- return cache;
- }
-
- /* the parent is unbacked */
- if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
- /* cookie not an index and is unbacked */
- spin_unlock(&cookie->lock);
- _leave(" = NULL [cookie ub,ni]");
- return NULL;
- }
-
- spin_unlock(&cookie->lock);
-
- if (!cookie->def->select_cache)
- goto no_preference;
-
- /* ask the netfs for its preference */
- tag = cookie->def->select_cache(cookie->parent->netfs_data,
- cookie->netfs_data);
- if (!tag)
- goto no_preference;
-
- if (tag == ERR_PTR(-ENOMEM)) {
- _leave(" = NULL [nomem tag]");
- return NULL;
- }
-
- if (!tag->cache) {
- _leave(" = NULL [unbacked tag]");
- return NULL;
- }
-
- if (test_bit(FSCACHE_IOERROR, &tag->cache->flags))
- return NULL;
-
- _leave(" = %s [specific]", tag->name);
- return tag->cache;
-
-no_preference:
- /* netfs has no preference - just select first cache */
- cache = list_entry(fscache_cache_list.next,
- struct fscache_cache, link);
- _leave(" = %s [first]", cache->tag->name);
- return cache;
-}
-
-/**
- * fscache_init_cache - Initialise a cache record
- * @cache: The cache record to be initialised
- * @ops: The cache operations to be installed in that record
- * @idfmt: Format string to define identifier
- * @...: sprintf-style arguments
- *
- * Initialise a record of a cache and fill in the name.
- *
- * See Documentation/filesystems/caching/backend-api.rst for a complete
- * description.
- */
-void fscache_init_cache(struct fscache_cache *cache,
- const struct fscache_cache_ops *ops,
- const char *idfmt,
- ...)
-{
- va_list va;
-
- memset(cache, 0, sizeof(*cache));
-
- cache->ops = ops;
-
- va_start(va, idfmt);
- vsnprintf(cache->identifier, sizeof(cache->identifier), idfmt, va);
- va_end(va);
-
- INIT_WORK(&cache->op_gc, fscache_operation_gc);
- INIT_LIST_HEAD(&cache->link);
- INIT_LIST_HEAD(&cache->object_list);
- INIT_LIST_HEAD(&cache->op_gc_list);
- spin_lock_init(&cache->object_list_lock);
- spin_lock_init(&cache->op_gc_list_lock);
-}
-EXPORT_SYMBOL(fscache_init_cache);
-
-/**
- * fscache_add_cache - Declare a cache as being open for business
- * @cache: The record describing the cache
- * @ifsdef: The record of the cache object describing the top-level index
- * @tagname: The tag describing this cache
- *
- * Add a cache to the system, making it available for netfs's to use.
- *
- * See Documentation/filesystems/caching/backend-api.rst for a complete
- * description.
- */
-int fscache_add_cache(struct fscache_cache *cache,
- struct fscache_object *ifsdef,
- const char *tagname)
-{
- struct fscache_cache_tag *tag;
-
- ASSERTCMP(ifsdef->cookie, ==, &fscache_fsdef_index);
- BUG_ON(!cache->ops);
- BUG_ON(!ifsdef);
-
- cache->flags = 0;
- ifsdef->event_mask =
- ((1 << NR_FSCACHE_OBJECT_EVENTS) - 1) &
- ~(1 << FSCACHE_OBJECT_EV_CLEARED);
- __set_bit(FSCACHE_OBJECT_IS_AVAILABLE, &ifsdef->flags);
-
- if (!tagname)
- tagname = cache->identifier;
-
- BUG_ON(!tagname[0]);
-
- _enter("{%s.%s},,%s", cache->ops->name, cache->identifier, tagname);
-
- /* we use the cache tag to uniquely identify caches */
- tag = __fscache_lookup_cache_tag(tagname);
- if (IS_ERR(tag))
- goto nomem;
-
- if (test_and_set_bit(FSCACHE_TAG_RESERVED, &tag->flags))
- goto tag_in_use;
-
- cache->kobj = kobject_create_and_add(tagname, fscache_root);
- if (!cache->kobj)
- goto error;
-
- ifsdef->cache = cache;
- cache->fsdef = ifsdef;
-
- down_write(&fscache_addremove_sem);
-
- tag->cache = cache;
- cache->tag = tag;
-
- /* add the cache to the list */
- list_add(&cache->link, &fscache_cache_list);
-
- /* add the cache's netfs definition index object to the cache's
- * list */
- spin_lock(&cache->object_list_lock);
- list_add_tail(&ifsdef->cache_link, &cache->object_list);
- spin_unlock(&cache->object_list_lock);
-
- /* add the cache's netfs definition index object to the top level index
- * cookie as a known backing object */
- spin_lock(&fscache_fsdef_index.lock);
-
- hlist_add_head(&ifsdef->cookie_link,
- &fscache_fsdef_index.backing_objects);
-
- refcount_inc(&fscache_fsdef_index.ref);
-
- /* done */
- spin_unlock(&fscache_fsdef_index.lock);
- up_write(&fscache_addremove_sem);
-
- pr_notice("Cache \"%s\" added (type %s)\n",
- cache->tag->name, cache->ops->name);
- kobject_uevent(cache->kobj, KOBJ_ADD);
-
- _leave(" = 0 [%s]", cache->identifier);
- return 0;
-
-tag_in_use:
- pr_err("Cache tag '%s' already in use\n", tagname);
- __fscache_release_cache_tag(tag);
- _leave(" = -EXIST");
- return -EEXIST;
-
-error:
- __fscache_release_cache_tag(tag);
- _leave(" = -EINVAL");
- return -EINVAL;
-
-nomem:
- _leave(" = -ENOMEM");
- return -ENOMEM;
-}
-EXPORT_SYMBOL(fscache_add_cache);
-
-/**
- * fscache_io_error - Note a cache I/O error
- * @cache: The record describing the cache
- *
- * Note that an I/O error occurred in a cache and that it should no longer be
- * used for anything. This also reports the error into the kernel log.
- *
- * See Documentation/filesystems/caching/backend-api.rst for a complete
- * description.
- */
-void fscache_io_error(struct fscache_cache *cache)
-{
- if (!test_and_set_bit(FSCACHE_IOERROR, &cache->flags))
- pr_err("Cache '%s' stopped due to I/O error\n",
- cache->ops->name);
-}
-EXPORT_SYMBOL(fscache_io_error);
-
-/*
- * request withdrawal of all the objects in a cache
- * - all the objects being withdrawn are moved onto the supplied list
- */
-static void fscache_withdraw_all_objects(struct fscache_cache *cache,
- struct list_head *dying_objects)
-{
- struct fscache_object *object;
-
- while (!list_empty(&cache->object_list)) {
- spin_lock(&cache->object_list_lock);
-
- if (!list_empty(&cache->object_list)) {
- object = list_entry(cache->object_list.next,
- struct fscache_object, cache_link);
- list_move_tail(&object->cache_link, dying_objects);
-
- _debug("withdraw %x", object->cookie->debug_id);
-
- /* This must be done under object_list_lock to prevent
- * a race with fscache_drop_object().
- */
- fscache_raise_event(object, FSCACHE_OBJECT_EV_KILL);
- }
-
- spin_unlock(&cache->object_list_lock);
- cond_resched();
- }
-}
-
-/**
- * fscache_withdraw_cache - Withdraw a cache from the active service
- * @cache: The record describing the cache
- *
- * Withdraw a cache from service, unbinding all its cache objects from the
- * netfs cookies they're currently representing.
- *
- * See Documentation/filesystems/caching/backend-api.rst for a complete
- * description.
- */
-void fscache_withdraw_cache(struct fscache_cache *cache)
-{
- LIST_HEAD(dying_objects);
-
- _enter("");
-
- pr_notice("Withdrawing cache \"%s\"\n",
- cache->tag->name);
-
- /* make the cache unavailable for cookie acquisition */
- if (test_and_set_bit(FSCACHE_CACHE_WITHDRAWN, &cache->flags))
- BUG();
-
- down_write(&fscache_addremove_sem);
- list_del_init(&cache->link);
- cache->tag->cache = NULL;
- up_write(&fscache_addremove_sem);
-
- /* make sure all pages pinned by operations on behalf of the netfs are
- * written to disk */
- fscache_stat(&fscache_n_cop_sync_cache);
- cache->ops->sync_cache(cache);
- fscache_stat_d(&fscache_n_cop_sync_cache);
-
- /* we now have to destroy all the active objects pertaining to this
- * cache - which we do by passing them off to thread pool to be
- * disposed of */
- _debug("destroy");
-
- fscache_withdraw_all_objects(cache, &dying_objects);
-
- /* wait for all extant objects to finish their outstanding operations
- * and go away */
- _debug("wait for finish");
- wait_event(fscache_cache_cleared_wq,
- atomic_read(&cache->object_count) == 0);
- _debug("wait for clearance");
- wait_event(fscache_cache_cleared_wq,
- list_empty(&cache->object_list));
- _debug("cleared");
- ASSERT(list_empty(&dying_objects));
-
- kobject_put(cache->kobj);
-
- clear_bit(FSCACHE_TAG_RESERVED, &cache->tag->flags);
- fscache_release_cache_tag(cache->tag);
- cache->tag = NULL;
-
- _leave("");
-}
-EXPORT_SYMBOL(fscache_withdraw_cache);
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
deleted file mode 100644
index 8a850c3d0775..000000000000
--- a/fs/fscache/cookie.c
+++ /dev/null
@@ -1,1061 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* netfs cookie management
- *
- * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * See Documentation/filesystems/caching/netfs-api.rst for more information on
- * the netfs API.
- */
-
-#define FSCACHE_DEBUG_LEVEL COOKIE
-#include <linux/module.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-struct kmem_cache *fscache_cookie_jar;
-
-static atomic_t fscache_object_debug_id = ATOMIC_INIT(0);
-
-#define fscache_cookie_hash_shift 15
-static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift];
-static LIST_HEAD(fscache_cookies);
-static DEFINE_RWLOCK(fscache_cookies_lock);
-
-static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie,
- loff_t object_size);
-static int fscache_alloc_object(struct fscache_cache *cache,
- struct fscache_cookie *cookie);
-static int fscache_attach_object(struct fscache_cookie *cookie,
- struct fscache_object *object);
-
-static void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
-{
- struct fscache_object *object;
- struct hlist_node *o;
- const u8 *k;
- unsigned loop;
-
- pr_err("%c-cookie c=%08x [p=%08x fl=%lx nc=%u na=%u]\n",
- prefix,
- cookie->debug_id,
- cookie->parent ? cookie->parent->debug_id : 0,
- cookie->flags,
- atomic_read(&cookie->n_children),
- atomic_read(&cookie->n_active));
- pr_err("%c-cookie d=%p{%s} n=%p\n",
- prefix,
- cookie->def,
- cookie->def ? cookie->def->name : "?",
- cookie->netfs_data);
-
- o = READ_ONCE(cookie->backing_objects.first);
- if (o) {
- object = hlist_entry(o, struct fscache_object, cookie_link);
- pr_err("%c-cookie o=%u\n", prefix, object->debug_id);
- }
-
- pr_err("%c-key=[%u] '", prefix, cookie->key_len);
- k = (cookie->key_len <= sizeof(cookie->inline_key)) ?
- cookie->inline_key : cookie->key;
- for (loop = 0; loop < cookie->key_len; loop++)
- pr_cont("%02x", k[loop]);
- pr_cont("'\n");
-}
-
-void fscache_free_cookie(struct fscache_cookie *cookie)
-{
- if (cookie) {
- BUG_ON(!hlist_empty(&cookie->backing_objects));
- write_lock(&fscache_cookies_lock);
- list_del(&cookie->proc_link);
- write_unlock(&fscache_cookies_lock);
- if (cookie->aux_len > sizeof(cookie->inline_aux))
- kfree(cookie->aux);
- if (cookie->key_len > sizeof(cookie->inline_key))
- kfree(cookie->key);
- kmem_cache_free(fscache_cookie_jar, cookie);
- }
-}
-
-/*
- * Set the index key in a cookie. The cookie struct has space for a 16-byte
- * key plus length and hash, but if that's not big enough, it's instead a
- * pointer to a buffer containing 3 bytes of hash, 1 byte of length and then
- * the key data.
- */
-static int fscache_set_key(struct fscache_cookie *cookie,
- const void *index_key, size_t index_key_len)
-{
- u32 *buf;
- int bufs;
-
- bufs = DIV_ROUND_UP(index_key_len, sizeof(*buf));
-
- if (index_key_len > sizeof(cookie->inline_key)) {
- buf = kcalloc(bufs, sizeof(*buf), GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- cookie->key = buf;
- } else {
- buf = (u32 *)cookie->inline_key;
- }
-
- memcpy(buf, index_key, index_key_len);
- cookie->key_hash = fscache_hash(0, buf, bufs);
- return 0;
-}
-
-static long fscache_compare_cookie(const struct fscache_cookie *a,
- const struct fscache_cookie *b)
-{
- const void *ka, *kb;
-
- if (a->key_hash != b->key_hash)
- return (long)a->key_hash - (long)b->key_hash;
- if (a->parent != b->parent)
- return (long)a->parent - (long)b->parent;
- if (a->key_len != b->key_len)
- return (long)a->key_len - (long)b->key_len;
- if (a->type != b->type)
- return (long)a->type - (long)b->type;
-
- if (a->key_len <= sizeof(a->inline_key)) {
- ka = &a->inline_key;
- kb = &b->inline_key;
- } else {
- ka = a->key;
- kb = b->key;
- }
- return memcmp(ka, kb, a->key_len);
-}
-
-static atomic_t fscache_cookie_debug_id = ATOMIC_INIT(1);
-
-/*
- * Allocate a cookie.
- */
-struct fscache_cookie *fscache_alloc_cookie(
- struct fscache_cookie *parent,
- const struct fscache_cookie_def *def,
- const void *index_key, size_t index_key_len,
- const void *aux_data, size_t aux_data_len,
- void *netfs_data,
- loff_t object_size)
-{
- struct fscache_cookie *cookie;
-
- /* allocate and initialise a cookie */
- cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
- if (!cookie)
- return NULL;
-
- cookie->key_len = index_key_len;
- cookie->aux_len = aux_data_len;
-
- if (fscache_set_key(cookie, index_key, index_key_len) < 0)
- goto nomem;
-
- if (cookie->aux_len <= sizeof(cookie->inline_aux)) {
- memcpy(cookie->inline_aux, aux_data, cookie->aux_len);
- } else {
- cookie->aux = kmemdup(aux_data, cookie->aux_len, GFP_KERNEL);
- if (!cookie->aux)
- goto nomem;
- }
-
- refcount_set(&cookie->ref, 1);
- atomic_set(&cookie->n_children, 0);
- cookie->debug_id = atomic_inc_return(&fscache_cookie_debug_id);
-
- /* We keep the active count elevated until relinquishment to prevent an
- * attempt to wake up every time the object operations queue quiesces.
- */
- atomic_set(&cookie->n_active, 1);
-
- cookie->def = def;
- cookie->parent = parent;
- cookie->netfs_data = netfs_data;
- cookie->flags = (1 << FSCACHE_COOKIE_NO_DATA_YET);
- cookie->type = def->type;
- spin_lock_init(&cookie->lock);
- INIT_HLIST_HEAD(&cookie->backing_objects);
-
- write_lock(&fscache_cookies_lock);
- list_add_tail(&cookie->proc_link, &fscache_cookies);
- write_unlock(&fscache_cookies_lock);
- return cookie;
-
-nomem:
- fscache_free_cookie(cookie);
- return NULL;
-}
-
-/*
- * Attempt to insert the new cookie into the hash. If there's a collision, we
- * return the old cookie if it's not in use and an error otherwise.
- */
-struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *candidate)
-{
- struct fscache_cookie *cursor;
- struct hlist_bl_head *h;
- struct hlist_bl_node *p;
- unsigned int bucket;
-
- bucket = candidate->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
- h = &fscache_cookie_hash[bucket];
-
- hlist_bl_lock(h);
- hlist_bl_for_each_entry(cursor, p, h, hash_link) {
- if (fscache_compare_cookie(candidate, cursor) == 0)
- goto collision;
- }
-
- __set_bit(FSCACHE_COOKIE_ACQUIRED, &candidate->flags);
- fscache_cookie_get(candidate->parent, fscache_cookie_get_acquire_parent);
- atomic_inc(&candidate->parent->n_children);
- hlist_bl_add_head(&candidate->hash_link, h);
- hlist_bl_unlock(h);
- return candidate;
-
-collision:
- if (test_and_set_bit(FSCACHE_COOKIE_ACQUIRED, &cursor->flags)) {
- trace_fscache_cookie(cursor->debug_id, refcount_read(&cursor->ref),
- fscache_cookie_collision);
- pr_err("Duplicate cookie detected\n");
- fscache_print_cookie(cursor, 'O');
- fscache_print_cookie(candidate, 'N');
- hlist_bl_unlock(h);
- return NULL;
- }
-
- fscache_cookie_get(cursor, fscache_cookie_get_reacquire);
- hlist_bl_unlock(h);
- return cursor;
-}
-
-/*
- * request a cookie to represent an object (index, datafile, xattr, etc)
- * - parent specifies the parent object
- * - the top level index cookie for each netfs is stored in the fscache_netfs
- * struct upon registration
- * - def points to the definition
- * - the netfs_data will be passed to the functions pointed to in *def
- * - all attached caches will be searched to see if they contain this object
- * - index objects aren't stored on disk until there's a dependent file that
- * needs storing
- * - other objects are stored in a selected cache immediately, and all the
- * indices forming the path to it are instantiated if necessary
- * - we never let on to the netfs about errors
- * - we may set a negative cookie pointer, but that's okay
- */
-struct fscache_cookie *__fscache_acquire_cookie(
- struct fscache_cookie *parent,
- const struct fscache_cookie_def *def,
- const void *index_key, size_t index_key_len,
- const void *aux_data, size_t aux_data_len,
- void *netfs_data,
- loff_t object_size,
- bool enable)
-{
- struct fscache_cookie *candidate, *cookie;
-
- BUG_ON(!def);
-
- _enter("{%s},{%s},%p,%u",
- parent ? (char *) parent->def->name : "<no-parent>",
- def->name, netfs_data, enable);
-
- if (!index_key || !index_key_len || index_key_len > 255 || aux_data_len > 255)
- return NULL;
- if (!aux_data || !aux_data_len) {
- aux_data = NULL;
- aux_data_len = 0;
- }
-
- fscache_stat(&fscache_n_acquires);
-
- /* if there's no parent cookie, then we don't create one here either */
- if (!parent) {
- fscache_stat(&fscache_n_acquires_null);
- _leave(" [no parent]");
- return NULL;
- }
-
- /* validate the definition */
- BUG_ON(!def->name[0]);
-
- BUG_ON(def->type == FSCACHE_COOKIE_TYPE_INDEX &&
- parent->type != FSCACHE_COOKIE_TYPE_INDEX);
-
- candidate = fscache_alloc_cookie(parent, def,
- index_key, index_key_len,
- aux_data, aux_data_len,
- netfs_data, object_size);
- if (!candidate) {
- fscache_stat(&fscache_n_acquires_oom);
- _leave(" [ENOMEM]");
- return NULL;
- }
-
- cookie = fscache_hash_cookie(candidate);
- if (!cookie) {
- trace_fscache_cookie(candidate->debug_id, 1,
- fscache_cookie_discard);
- goto out;
- }
-
- if (cookie == candidate)
- candidate = NULL;
-
- switch (cookie->type) {
- case FSCACHE_COOKIE_TYPE_INDEX:
- fscache_stat(&fscache_n_cookie_index);
- break;
- case FSCACHE_COOKIE_TYPE_DATAFILE:
- fscache_stat(&fscache_n_cookie_data);
- break;
- default:
- fscache_stat(&fscache_n_cookie_special);
- break;
- }
-
- trace_fscache_acquire(cookie);
-
- if (enable) {
- /* if the object is an index then we need do nothing more here
- * - we create indices on disk when we need them as an index
- * may exist in multiple caches */
- if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
- if (fscache_acquire_non_index_cookie(cookie, object_size) == 0) {
- set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
- } else {
- atomic_dec(&parent->n_children);
- fscache_cookie_put(cookie,
- fscache_cookie_put_acquire_nobufs);
- fscache_stat(&fscache_n_acquires_nobufs);
- _leave(" = NULL");
- return NULL;
- }
- } else {
- set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
- }
- }
-
- fscache_stat(&fscache_n_acquires_ok);
-
-out:
- fscache_free_cookie(candidate);
- return cookie;
-}
-EXPORT_SYMBOL(__fscache_acquire_cookie);
-
-/*
- * Enable a cookie to permit it to accept new operations.
- */
-void __fscache_enable_cookie(struct fscache_cookie *cookie,
- const void *aux_data,
- loff_t object_size,
- bool (*can_enable)(void *data),
- void *data)
-{
- _enter("%x", cookie->debug_id);
-
- trace_fscache_enable(cookie);
-
- wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
- TASK_UNINTERRUPTIBLE);
-
- fscache_update_aux(cookie, aux_data);
-
- if (test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
- goto out_unlock;
-
- if (can_enable && !can_enable(data)) {
- /* The netfs decided it didn't want to enable after all */
- } else if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
- /* Wait for outstanding disablement to complete */
- __fscache_wait_on_invalidate(cookie);
-
- if (fscache_acquire_non_index_cookie(cookie, object_size) == 0)
- set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
- } else {
- set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
- }
-
-out_unlock:
- clear_bit_unlock(FSCACHE_COOKIE_ENABLEMENT_LOCK, &cookie->flags);
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK);
-}
-EXPORT_SYMBOL(__fscache_enable_cookie);
-
-/*
- * acquire a non-index cookie
- * - this must make sure the index chain is instantiated and instantiate the
- * object representation too
- */
-static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie,
- loff_t object_size)
-{
- struct fscache_object *object;
- struct fscache_cache *cache;
- int ret;
-
- _enter("");
-
- set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
-
- /* now we need to see whether the backing objects for this cookie yet
- * exist, if not there'll be nothing to search */
- down_read(&fscache_addremove_sem);
-
- if (list_empty(&fscache_cache_list)) {
- up_read(&fscache_addremove_sem);
- _leave(" = 0 [no caches]");
- return 0;
- }
-
- /* select a cache in which to store the object */
- cache = fscache_select_cache_for_object(cookie->parent);
- if (!cache) {
- up_read(&fscache_addremove_sem);
- fscache_stat(&fscache_n_acquires_no_cache);
- _leave(" = -ENOMEDIUM [no cache]");
- return -ENOMEDIUM;
- }
-
- _debug("cache %s", cache->tag->name);
-
- set_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
-
- /* ask the cache to allocate objects for this cookie and its parent
- * chain */
- ret = fscache_alloc_object(cache, cookie);
- if (ret < 0) {
- up_read(&fscache_addremove_sem);
- _leave(" = %d", ret);
- return ret;
- }
-
- spin_lock(&cookie->lock);
- if (hlist_empty(&cookie->backing_objects)) {
- spin_unlock(&cookie->lock);
- goto unavailable;
- }
-
- object = hlist_entry(cookie->backing_objects.first,
- struct fscache_object, cookie_link);
-
- fscache_set_store_limit(object, object_size);
-
- /* initiate the process of looking up all the objects in the chain
- * (done by fscache_initialise_object()) */
- fscache_raise_event(object, FSCACHE_OBJECT_EV_NEW_CHILD);
-
- spin_unlock(&cookie->lock);
-
- /* we may be required to wait for lookup to complete at this point */
- if (!fscache_defer_lookup) {
- wait_on_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP,
- TASK_UNINTERRUPTIBLE);
- if (test_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags))
- goto unavailable;
- }
-
- up_read(&fscache_addremove_sem);
- _leave(" = 0 [deferred]");
- return 0;
-
-unavailable:
- up_read(&fscache_addremove_sem);
- _leave(" = -ENOBUFS");
- return -ENOBUFS;
-}
-
-/*
- * recursively allocate cache object records for a cookie/cache combination
- * - caller must be holding the addremove sem
- */
-static int fscache_alloc_object(struct fscache_cache *cache,
- struct fscache_cookie *cookie)
-{
- struct fscache_object *object;
- int ret;
-
- _enter("%s,%x{%s}", cache->tag->name, cookie->debug_id, cookie->def->name);
-
- spin_lock(&cookie->lock);
- hlist_for_each_entry(object, &cookie->backing_objects,
- cookie_link) {
- if (object->cache == cache)
- goto object_already_extant;
- }
- spin_unlock(&cookie->lock);
-
- /* ask the cache to allocate an object (we may end up with duplicate
- * objects at this stage, but we sort that out later) */
- fscache_stat(&fscache_n_cop_alloc_object);
- object = cache->ops->alloc_object(cache, cookie);
- fscache_stat_d(&fscache_n_cop_alloc_object);
- if (IS_ERR(object)) {
- fscache_stat(&fscache_n_object_no_alloc);
- ret = PTR_ERR(object);
- goto error;
- }
-
- ASSERTCMP(object->cookie, ==, cookie);
- fscache_stat(&fscache_n_object_alloc);
-
- object->debug_id = atomic_inc_return(&fscache_object_debug_id);
-
- _debug("ALLOC OBJ%x: %s {%lx}",
- object->debug_id, cookie->def->name, object->events);
-
- ret = fscache_alloc_object(cache, cookie->parent);
- if (ret < 0)
- goto error_put;
-
- /* only attach if we managed to allocate all we needed, otherwise
- * discard the object we just allocated and instead use the one
- * attached to the cookie */
- if (fscache_attach_object(cookie, object) < 0) {
- fscache_stat(&fscache_n_cop_put_object);
- cache->ops->put_object(object, fscache_obj_put_attach_fail);
- fscache_stat_d(&fscache_n_cop_put_object);
- }
-
- _leave(" = 0");
- return 0;
-
-object_already_extant:
- ret = -ENOBUFS;
- if (fscache_object_is_dying(object) ||
- fscache_cache_is_broken(object)) {
- spin_unlock(&cookie->lock);
- goto error;
- }
- spin_unlock(&cookie->lock);
- _leave(" = 0 [found]");
- return 0;
-
-error_put:
- fscache_stat(&fscache_n_cop_put_object);
- cache->ops->put_object(object, fscache_obj_put_alloc_fail);
- fscache_stat_d(&fscache_n_cop_put_object);
-error:
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * attach a cache object to a cookie
- */
-static int fscache_attach_object(struct fscache_cookie *cookie,
- struct fscache_object *object)
-{
- struct fscache_object *p;
- struct fscache_cache *cache = object->cache;
- int ret;
-
- _enter("{%s},{OBJ%x}", cookie->def->name, object->debug_id);
-
- ASSERTCMP(object->cookie, ==, cookie);
-
- spin_lock(&cookie->lock);
-
- /* there may be multiple initial creations of this object, but we only
- * want one */
- ret = -EEXIST;
- hlist_for_each_entry(p, &cookie->backing_objects, cookie_link) {
- if (p->cache == object->cache) {
- if (fscache_object_is_dying(p))
- ret = -ENOBUFS;
- goto cant_attach_object;
- }
- }
-
- /* pin the parent object */
- spin_lock_nested(&cookie->parent->lock, 1);
- hlist_for_each_entry(p, &cookie->parent->backing_objects,
- cookie_link) {
- if (p->cache == object->cache) {
- if (fscache_object_is_dying(p)) {
- ret = -ENOBUFS;
- spin_unlock(&cookie->parent->lock);
- goto cant_attach_object;
- }
- object->parent = p;
- spin_lock(&p->lock);
- p->n_children++;
- spin_unlock(&p->lock);
- break;
- }
- }
- spin_unlock(&cookie->parent->lock);
-
- /* attach to the cache's object list */
- if (list_empty(&object->cache_link)) {
- spin_lock(&cache->object_list_lock);
- list_add(&object->cache_link, &cache->object_list);
- spin_unlock(&cache->object_list_lock);
- }
-
- /* Attach to the cookie. The object already has a ref on it. */
- hlist_add_head(&object->cookie_link, &cookie->backing_objects);
- ret = 0;
-
-cant_attach_object:
- spin_unlock(&cookie->lock);
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * Invalidate an object. Callable with spinlocks held.
- */
-void __fscache_invalidate(struct fscache_cookie *cookie)
-{
- struct fscache_object *object;
-
- _enter("{%s}", cookie->def->name);
-
- fscache_stat(&fscache_n_invalidates);
-
- /* Only permit invalidation of data files. Invalidating an index will
- * require the caller to release all its attachments to the tree rooted
- * there, and if it's doing that, it may as well just retire the
- * cookie.
- */
- ASSERTCMP(cookie->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
-
- /* If there's an object, we tell the object state machine to handle the
- * invalidation on our behalf, otherwise there's nothing to do.
- */
- if (!hlist_empty(&cookie->backing_objects)) {
- spin_lock(&cookie->lock);
-
- if (fscache_cookie_enabled(cookie) &&
- !hlist_empty(&cookie->backing_objects) &&
- !test_and_set_bit(FSCACHE_COOKIE_INVALIDATING,
- &cookie->flags)) {
- object = hlist_entry(cookie->backing_objects.first,
- struct fscache_object,
- cookie_link);
- if (fscache_object_is_live(object))
- fscache_raise_event(
- object, FSCACHE_OBJECT_EV_INVALIDATE);
- }
-
- spin_unlock(&cookie->lock);
- }
-
- _leave("");
-}
-EXPORT_SYMBOL(__fscache_invalidate);
-
-/*
- * Wait for object invalidation to complete.
- */
-void __fscache_wait_on_invalidate(struct fscache_cookie *cookie)
-{
- _enter("%x", cookie->debug_id);
-
- wait_on_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING,
- TASK_UNINTERRUPTIBLE);
-
- _leave("");
-}
-EXPORT_SYMBOL(__fscache_wait_on_invalidate);
-
-/*
- * update the index entries backing a cookie
- */
-void __fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data)
-{
- struct fscache_object *object;
-
- fscache_stat(&fscache_n_updates);
-
- if (!cookie) {
- fscache_stat(&fscache_n_updates_null);
- _leave(" [no cookie]");
- return;
- }
-
- _enter("{%s}", cookie->def->name);
-
- spin_lock(&cookie->lock);
-
- fscache_update_aux(cookie, aux_data);
-
- if (fscache_cookie_enabled(cookie)) {
- /* update the index entry on disk in each cache backing this
- * cookie.
- */
- hlist_for_each_entry(object,
- &cookie->backing_objects, cookie_link) {
- fscache_raise_event(object, FSCACHE_OBJECT_EV_UPDATE);
- }
- }
-
- spin_unlock(&cookie->lock);
- _leave("");
-}
-EXPORT_SYMBOL(__fscache_update_cookie);
-
-/*
- * Disable a cookie to stop it from accepting new requests from the netfs.
- */
-void __fscache_disable_cookie(struct fscache_cookie *cookie,
- const void *aux_data,
- bool invalidate)
-{
- struct fscache_object *object;
- bool awaken = false;
-
- _enter("%x,%u", cookie->debug_id, invalidate);
-
- trace_fscache_disable(cookie);
-
- ASSERTCMP(atomic_read(&cookie->n_active), >, 0);
-
- if (atomic_read(&cookie->n_children) != 0) {
- pr_err("Cookie '%s' still has children\n",
- cookie->def->name);
- BUG();
- }
-
- wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
- TASK_UNINTERRUPTIBLE);
-
- fscache_update_aux(cookie, aux_data);
-
- if (!test_and_clear_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
- goto out_unlock_enable;
-
- /* If the cookie is being invalidated, wait for that to complete first
- * so that we can reuse the flag.
- */
- __fscache_wait_on_invalidate(cookie);
-
- /* Dispose of the backing objects */
- set_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags);
-
- spin_lock(&cookie->lock);
- if (!hlist_empty(&cookie->backing_objects)) {
- hlist_for_each_entry(object, &cookie->backing_objects, cookie_link) {
- if (invalidate)
- set_bit(FSCACHE_OBJECT_RETIRED, &object->flags);
- clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
- fscache_raise_event(object, FSCACHE_OBJECT_EV_KILL);
- }
- } else {
- if (test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
- awaken = true;
- }
- spin_unlock(&cookie->lock);
- if (awaken)
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
-
- /* Wait for cessation of activity requiring access to the netfs (when
- * n_active reaches 0). This makes sure outstanding reads and writes
- * have completed.
- */
- if (!atomic_dec_and_test(&cookie->n_active)) {
- wait_var_event(&cookie->n_active,
- !atomic_read(&cookie->n_active));
- }
-
- /* Reset the cookie state if it wasn't relinquished */
- if (!test_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags)) {
- atomic_inc(&cookie->n_active);
- set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
- }
-
-out_unlock_enable:
- clear_bit_unlock(FSCACHE_COOKIE_ENABLEMENT_LOCK, &cookie->flags);
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK);
- _leave("");
-}
-EXPORT_SYMBOL(__fscache_disable_cookie);
-
-/*
- * release a cookie back to the cache
- * - the object will be marked as recyclable on disk if retire is true
- * - all dependents of this cookie must have already been unregistered
- * (indices/files/pages)
- */
-void __fscache_relinquish_cookie(struct fscache_cookie *cookie,
- const void *aux_data,
- bool retire)
-{
- fscache_stat(&fscache_n_relinquishes);
- if (retire)
- fscache_stat(&fscache_n_relinquishes_retire);
-
- if (!cookie) {
- fscache_stat(&fscache_n_relinquishes_null);
- _leave(" [no cookie]");
- return;
- }
-
- _enter("%x{%s,%d},%d",
- cookie->debug_id, cookie->def->name,
- atomic_read(&cookie->n_active), retire);
-
- trace_fscache_relinquish(cookie, retire);
-
- /* No further netfs-accessing operations on this cookie permitted */
- if (test_and_set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags))
- BUG();
-
- __fscache_disable_cookie(cookie, aux_data, retire);
-
- /* Clear pointers back to the netfs */
- cookie->netfs_data = NULL;
- cookie->def = NULL;
-
- if (cookie->parent) {
- ASSERTCMP(refcount_read(&cookie->parent->ref), >, 0);
- ASSERTCMP(atomic_read(&cookie->parent->n_children), >, 0);
- atomic_dec(&cookie->parent->n_children);
- }
-
- /* Dispose of the netfs's link to the cookie */
- fscache_cookie_put(cookie, fscache_cookie_put_relinquish);
-
- _leave("");
-}
-EXPORT_SYMBOL(__fscache_relinquish_cookie);
-
-/*
- * Remove a cookie from the hash table.
- */
-static void fscache_unhash_cookie(struct fscache_cookie *cookie)
-{
- struct hlist_bl_head *h;
- unsigned int bucket;
-
- bucket = cookie->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
- h = &fscache_cookie_hash[bucket];
-
- hlist_bl_lock(h);
- hlist_bl_del(&cookie->hash_link);
- hlist_bl_unlock(h);
-}
-
-/*
- * Drop a reference to a cookie.
- */
-void fscache_cookie_put(struct fscache_cookie *cookie,
- enum fscache_cookie_trace where)
-{
- struct fscache_cookie *parent;
- int ref;
-
- _enter("%x", cookie->debug_id);
-
- do {
- unsigned int cookie_debug_id = cookie->debug_id;
- bool zero = __refcount_dec_and_test(&cookie->ref, &ref);
-
- trace_fscache_cookie(cookie_debug_id, ref - 1, where);
- if (!zero)
- return;
-
- parent = cookie->parent;
- fscache_unhash_cookie(cookie);
- fscache_free_cookie(cookie);
-
- cookie = parent;
- where = fscache_cookie_put_parent;
- } while (cookie);
-
- _leave("");
-}
-
-/*
- * Get a reference to a cookie.
- */
-struct fscache_cookie *fscache_cookie_get(struct fscache_cookie *cookie,
- enum fscache_cookie_trace where)
-{
- int ref;
-
- __refcount_inc(&cookie->ref, &ref);
- trace_fscache_cookie(cookie->debug_id, ref + 1, where);
- return cookie;
-}
-
-/*
- * check the consistency between the netfs inode and the backing cache
- *
- * NOTE: it only serves no-index type
- */
-int __fscache_check_consistency(struct fscache_cookie *cookie,
- const void *aux_data)
-{
- struct fscache_operation *op;
- struct fscache_object *object;
- bool wake_cookie = false;
- int ret;
-
- _enter("%p,", cookie);
-
- ASSERTCMP(cookie->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
-
- if (fscache_wait_for_deferred_lookup(cookie) < 0)
- return -ERESTARTSYS;
-
- if (hlist_empty(&cookie->backing_objects))
- return 0;
-
- op = kzalloc(sizeof(*op), GFP_NOIO | __GFP_NOMEMALLOC | __GFP_NORETRY);
- if (!op)
- return -ENOMEM;
-
- fscache_operation_init(cookie, op, NULL, NULL, NULL);
- op->flags = FSCACHE_OP_MYTHREAD |
- (1 << FSCACHE_OP_WAITING) |
- (1 << FSCACHE_OP_UNUSE_COOKIE);
- trace_fscache_page_op(cookie, NULL, op, fscache_page_op_check_consistency);
-
- spin_lock(&cookie->lock);
-
- fscache_update_aux(cookie, aux_data);
-
- if (!fscache_cookie_enabled(cookie) ||
- hlist_empty(&cookie->backing_objects))
- goto inconsistent;
- object = hlist_entry(cookie->backing_objects.first,
- struct fscache_object, cookie_link);
- if (test_bit(FSCACHE_IOERROR, &object->cache->flags))
- goto inconsistent;
-
- op->debug_id = atomic_inc_return(&fscache_op_debug_id);
-
- __fscache_use_cookie(cookie);
- if (fscache_submit_op(object, op) < 0)
- goto submit_failed;
-
- /* the work queue now carries its own ref on the object */
- spin_unlock(&cookie->lock);
-
- ret = fscache_wait_for_operation_activation(object, op, NULL, NULL);
- if (ret == 0) {
- /* ask the cache to honour the operation */
- ret = object->cache->ops->check_consistency(op);
- fscache_op_complete(op, false);
- } else if (ret == -ENOBUFS) {
- ret = 0;
- }
-
- fscache_put_operation(op);
- _leave(" = %d", ret);
- return ret;
-
-submit_failed:
- wake_cookie = __fscache_unuse_cookie(cookie);
-inconsistent:
- spin_unlock(&cookie->lock);
- if (wake_cookie)
- __fscache_wake_unused_cookie(cookie);
- kfree(op);
- _leave(" = -ESTALE");
- return -ESTALE;
-}
-EXPORT_SYMBOL(__fscache_check_consistency);
-
-/*
- * Generate a list of extant cookies in /proc/fs/fscache/cookies
- */
-static int fscache_cookies_seq_show(struct seq_file *m, void *v)
-{
- struct fscache_cookie *cookie;
- unsigned int keylen = 0, auxlen = 0;
- char _type[3], *type;
- u8 *p;
-
- if (v == &fscache_cookies) {
- seq_puts(m,
- "COOKIE PARENT USAGE CHILD ACT TY FL DEF NETFS_DATA\n"
- "======== ======== ===== ===== === == === ================ ==========\n"
- );
- return 0;
- }
-
- cookie = list_entry(v, struct fscache_cookie, proc_link);
-
- switch (cookie->type) {
- case 0:
- type = "IX";
- break;
- case 1:
- type = "DT";
- break;
- default:
- snprintf(_type, sizeof(_type), "%02u",
- cookie->type);
- type = _type;
- break;
- }
-
- seq_printf(m,
- "%08x %08x %5u %5u %3u %s %03lx %-16s %px",
- cookie->debug_id,
- cookie->parent ? cookie->parent->debug_id : 0,
- refcount_read(&cookie->ref),
- atomic_read(&cookie->n_children),
- atomic_read(&cookie->n_active),
- type,
- cookie->flags,
- cookie->def->name,
- cookie->netfs_data);
-
- keylen = cookie->key_len;
- auxlen = cookie->aux_len;
-
- if (keylen > 0 || auxlen > 0) {
- seq_puts(m, " ");
- p = keylen <= sizeof(cookie->inline_key) ?
- cookie->inline_key : cookie->key;
- for (; keylen > 0; keylen--)
- seq_printf(m, "%02x", *p++);
- if (auxlen > 0) {
- seq_puts(m, ", ");
- p = auxlen <= sizeof(cookie->inline_aux) ?
- cookie->inline_aux : cookie->aux;
- for (; auxlen > 0; auxlen--)
- seq_printf(m, "%02x", *p++);
- }
- }
-
- seq_puts(m, "\n");
- return 0;
-}
-
-static void *fscache_cookies_seq_start(struct seq_file *m, loff_t *_pos)
- __acquires(fscache_cookies_lock)
-{
- read_lock(&fscache_cookies_lock);
- return seq_list_start_head(&fscache_cookies, *_pos);
-}
-
-static void *fscache_cookies_seq_next(struct seq_file *m, void *v, loff_t *_pos)
-{
- return seq_list_next(v, &fscache_cookies, _pos);
-}
-
-static void fscache_cookies_seq_stop(struct seq_file *m, void *v)
- __releases(rcu)
-{
- read_unlock(&fscache_cookies_lock);
-}
-
-
-const struct seq_operations fscache_cookies_seq_ops = {
- .start = fscache_cookies_seq_start,
- .next = fscache_cookies_seq_next,
- .stop = fscache_cookies_seq_stop,
- .show = fscache_cookies_seq_show,
-};
diff --git a/fs/fscache/fsdef.c b/fs/fscache/fsdef.c
deleted file mode 100644
index 0402673c680e..000000000000
--- a/fs/fscache/fsdef.c
+++ /dev/null
@@ -1,98 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Filesystem index definition
- *
- * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL CACHE
-#include <linux/module.h>
-#include "internal.h"
-
-static
-enum fscache_checkaux fscache_fsdef_netfs_check_aux(void *cookie_netfs_data,
- const void *data,
- uint16_t datalen,
- loff_t object_size);
-
-/*
- * The root index is owned by FS-Cache itself.
- *
- * When a netfs requests caching facilities, FS-Cache will, if one doesn't
- * already exist, create an entry in the root index with the key being the name
- * of the netfs ("AFS" for example), and the auxiliary data holding the index
- * structure version supplied by the netfs:
- *
- * FSDEF
- * |
- * +-----------+
- * | |
- * NFS AFS
- * [v=1] [v=1]
- *
- * If an entry with the appropriate name does already exist, the version is
- * compared. If the version is different, the entire subtree from that entry
- * will be discarded and a new entry created.
- *
- * The new entry will be an index, and a cookie referring to it will be passed
- * to the netfs. This is then the root handle by which the netfs accesses the
- * cache. It can create whatever objects it likes in that index, including
- * further indices.
- */
-static struct fscache_cookie_def fscache_fsdef_index_def = {
- .name = ".FS-Cache",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-
-struct fscache_cookie fscache_fsdef_index = {
- .debug_id = 1,
- .ref = REFCOUNT_INIT(1),
- .n_active = ATOMIC_INIT(1),
- .lock = __SPIN_LOCK_UNLOCKED(fscache_fsdef_index.lock),
- .backing_objects = HLIST_HEAD_INIT,
- .def = &fscache_fsdef_index_def,
- .flags = 1 << FSCACHE_COOKIE_ENABLED,
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-EXPORT_SYMBOL(fscache_fsdef_index);
-
-/*
- * Definition of an entry in the root index. Each entry is an index, keyed to
- * a specific netfs and only applicable to a particular version of the index
- * structure used by that netfs.
- */
-struct fscache_cookie_def fscache_fsdef_netfs_def = {
- .name = "FSDEF.netfs",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
- .check_aux = fscache_fsdef_netfs_check_aux,
-};
-
-/*
- * check that the index structure version number stored in the auxiliary data
- * matches the one the netfs gave us
- */
-static enum fscache_checkaux fscache_fsdef_netfs_check_aux(
- void *cookie_netfs_data,
- const void *data,
- uint16_t datalen,
- loff_t object_size)
-{
- struct fscache_netfs *netfs = cookie_netfs_data;
- uint32_t version;
-
- _enter("{%s},,%hu", netfs->name, datalen);
-
- if (datalen != sizeof(version)) {
- _leave(" = OBSOLETE [dl=%d v=%zu]", datalen, sizeof(version));
- return FSCACHE_CHECKAUX_OBSOLETE;
- }
-
- memcpy(&version, data, sizeof(version));
- if (version != netfs->version) {
- _leave(" = OBSOLETE [ver=%x net=%x]", version, netfs->version);
- return FSCACHE_CHECKAUX_OBSOLETE;
- }
-
- _leave(" = OKAY");
- return FSCACHE_CHECKAUX_OKAY;
-}
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
deleted file mode 100644
index 6eb3f51d7275..000000000000
--- a/fs/fscache/internal.h
+++ /dev/null
@@ -1,409 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* Internal definitions for FS-Cache
- *
- * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-/*
- * Lock order, in the order in which multiple locks should be obtained:
- * - fscache_addremove_sem
- * - cookie->lock
- * - cookie->parent->lock
- * - cache->object_list_lock
- * - object->lock
- * - object->parent->lock
- * - cookie->stores_lock
- * - fscache_thread_lock
- *
- */
-
-#ifdef pr_fmt
-#undef pr_fmt
-#endif
-
-#define pr_fmt(fmt) "FS-Cache: " fmt
-
-#include <linux/fscache-cache.h>
-#include <trace/events/fscache.h>
-#include <linux/sched.h>
-#include <linux/seq_file.h>
-
-#define FSCACHE_MIN_THREADS 4
-#define FSCACHE_MAX_THREADS 32
-
-/*
- * cache.c
- */
-extern struct list_head fscache_cache_list;
-extern struct rw_semaphore fscache_addremove_sem;
-
-extern struct fscache_cache *fscache_select_cache_for_object(
- struct fscache_cookie *);
-
-/*
- * cookie.c
- */
-extern struct kmem_cache *fscache_cookie_jar;
-extern const struct seq_operations fscache_cookies_seq_ops;
-
-extern void fscache_free_cookie(struct fscache_cookie *);
-extern struct fscache_cookie *fscache_alloc_cookie(struct fscache_cookie *,
- const struct fscache_cookie_def *,
- const void *, size_t,
- const void *, size_t,
- void *, loff_t);
-extern struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *);
-extern struct fscache_cookie *fscache_cookie_get(struct fscache_cookie *,
- enum fscache_cookie_trace);
-extern void fscache_cookie_put(struct fscache_cookie *,
- enum fscache_cookie_trace);
-
-static inline void fscache_cookie_see(struct fscache_cookie *cookie,
- enum fscache_cookie_trace where)
-{
- trace_fscache_cookie(cookie->debug_id, refcount_read(&cookie->ref),
- where);
-}
-
-/*
- * fsdef.c
- */
-extern struct fscache_cookie fscache_fsdef_index;
-extern struct fscache_cookie_def fscache_fsdef_netfs_def;
-
-/*
- * main.c
- */
-extern unsigned fscache_defer_lookup;
-extern unsigned fscache_defer_create;
-extern unsigned fscache_debug;
-extern struct kobject *fscache_root;
-extern struct workqueue_struct *fscache_object_wq;
-extern struct workqueue_struct *fscache_op_wq;
-DECLARE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
-
-extern unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n);
-
-static inline bool fscache_object_congested(void)
-{
- return workqueue_congested(WORK_CPU_UNBOUND, fscache_object_wq);
-}
-
-/*
- * object.c
- */
-extern void fscache_enqueue_object(struct fscache_object *);
-
-/*
- * operation.c
- */
-extern int fscache_submit_exclusive_op(struct fscache_object *,
- struct fscache_operation *);
-extern int fscache_submit_op(struct fscache_object *,
- struct fscache_operation *);
-extern int fscache_cancel_op(struct fscache_operation *, bool);
-extern void fscache_cancel_all_ops(struct fscache_object *);
-extern void fscache_abort_object(struct fscache_object *);
-extern void fscache_start_operations(struct fscache_object *);
-extern void fscache_operation_gc(struct work_struct *);
-
-/*
- * page.c
- */
-extern int fscache_wait_for_deferred_lookup(struct fscache_cookie *);
-extern int fscache_wait_for_operation_activation(struct fscache_object *,
- struct fscache_operation *,
- atomic_t *,
- atomic_t *);
-
-/*
- * proc.c
- */
-#ifdef CONFIG_PROC_FS
-extern int __init fscache_proc_init(void);
-extern void fscache_proc_cleanup(void);
-#else
-#define fscache_proc_init() (0)
-#define fscache_proc_cleanup() do {} while (0)
-#endif
-
-/*
- * stats.c
- */
-#ifdef CONFIG_FSCACHE_STATS
-extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
-extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];
-
-extern atomic_t fscache_n_op_pend;
-extern atomic_t fscache_n_op_run;
-extern atomic_t fscache_n_op_enqueue;
-extern atomic_t fscache_n_op_deferred_release;
-extern atomic_t fscache_n_op_initialised;
-extern atomic_t fscache_n_op_release;
-extern atomic_t fscache_n_op_gc;
-extern atomic_t fscache_n_op_cancelled;
-extern atomic_t fscache_n_op_rejected;
-
-extern atomic_t fscache_n_attr_changed;
-extern atomic_t fscache_n_attr_changed_ok;
-extern atomic_t fscache_n_attr_changed_nobufs;
-extern atomic_t fscache_n_attr_changed_nomem;
-extern atomic_t fscache_n_attr_changed_calls;
-
-extern atomic_t fscache_n_retrievals;
-extern atomic_t fscache_n_retrievals_ok;
-extern atomic_t fscache_n_retrievals_wait;
-extern atomic_t fscache_n_retrievals_nodata;
-extern atomic_t fscache_n_retrievals_nobufs;
-extern atomic_t fscache_n_retrievals_intr;
-extern atomic_t fscache_n_retrievals_nomem;
-extern atomic_t fscache_n_retrievals_object_dead;
-extern atomic_t fscache_n_retrieval_ops;
-extern atomic_t fscache_n_retrieval_op_waits;
-
-extern atomic_t fscache_n_stores;
-extern atomic_t fscache_n_stores_ok;
-extern atomic_t fscache_n_stores_again;
-extern atomic_t fscache_n_stores_nobufs;
-extern atomic_t fscache_n_stores_intr;
-extern atomic_t fscache_n_stores_oom;
-extern atomic_t fscache_n_store_ops;
-extern atomic_t fscache_n_stores_object_dead;
-extern atomic_t fscache_n_store_op_waits;
-
-extern atomic_t fscache_n_acquires;
-extern atomic_t fscache_n_acquires_null;
-extern atomic_t fscache_n_acquires_no_cache;
-extern atomic_t fscache_n_acquires_ok;
-extern atomic_t fscache_n_acquires_nobufs;
-extern atomic_t fscache_n_acquires_oom;
-
-extern atomic_t fscache_n_invalidates;
-extern atomic_t fscache_n_invalidates_run;
-
-extern atomic_t fscache_n_updates;
-extern atomic_t fscache_n_updates_null;
-extern atomic_t fscache_n_updates_run;
-
-extern atomic_t fscache_n_relinquishes;
-extern atomic_t fscache_n_relinquishes_null;
-extern atomic_t fscache_n_relinquishes_waitcrt;
-extern atomic_t fscache_n_relinquishes_retire;
-
-extern atomic_t fscache_n_cookie_index;
-extern atomic_t fscache_n_cookie_data;
-extern atomic_t fscache_n_cookie_special;
-
-extern atomic_t fscache_n_object_alloc;
-extern atomic_t fscache_n_object_no_alloc;
-extern atomic_t fscache_n_object_lookups;
-extern atomic_t fscache_n_object_lookups_negative;
-extern atomic_t fscache_n_object_lookups_positive;
-extern atomic_t fscache_n_object_lookups_timed_out;
-extern atomic_t fscache_n_object_created;
-extern atomic_t fscache_n_object_avail;
-extern atomic_t fscache_n_object_dead;
-
-extern atomic_t fscache_n_checkaux_none;
-extern atomic_t fscache_n_checkaux_okay;
-extern atomic_t fscache_n_checkaux_update;
-extern atomic_t fscache_n_checkaux_obsolete;
-
-extern atomic_t fscache_n_cop_alloc_object;
-extern atomic_t fscache_n_cop_lookup_object;
-extern atomic_t fscache_n_cop_lookup_complete;
-extern atomic_t fscache_n_cop_grab_object;
-extern atomic_t fscache_n_cop_invalidate_object;
-extern atomic_t fscache_n_cop_update_object;
-extern atomic_t fscache_n_cop_drop_object;
-extern atomic_t fscache_n_cop_put_object;
-extern atomic_t fscache_n_cop_sync_cache;
-extern atomic_t fscache_n_cop_attr_changed;
-
-extern atomic_t fscache_n_cache_no_space_reject;
-extern atomic_t fscache_n_cache_stale_objects;
-extern atomic_t fscache_n_cache_retired_objects;
-extern atomic_t fscache_n_cache_culled_objects;
-
-static inline void fscache_stat(atomic_t *stat)
-{
- atomic_inc(stat);
-}
-
-static inline void fscache_stat_d(atomic_t *stat)
-{
- atomic_dec(stat);
-}
-
-#define __fscache_stat(stat) (stat)
-
-int fscache_stats_show(struct seq_file *m, void *v);
-#else
-
-#define __fscache_stat(stat) (NULL)
-#define fscache_stat(stat) do {} while (0)
-#define fscache_stat_d(stat) do {} while (0)
-#endif
-
-/*
- * raise an event on an object
- * - if the event is not masked for that object, then the object is
- * queued for attention by the thread pool.
- */
-static inline void fscache_raise_event(struct fscache_object *object,
- unsigned event)
-{
- BUG_ON(event >= NR_FSCACHE_OBJECT_EVENTS);
-#if 0
- printk("*** fscache_raise_event(OBJ%d{%lx},%x)\n",
- object->debug_id, object->event_mask, (1 << event));
-#endif
- if (!test_and_set_bit(event, &object->events) &&
- test_bit(event, &object->event_mask))
- fscache_enqueue_object(object);
-}
-
-/*
- * Update the auxiliary data on a cookie.
- */
-static inline
-void fscache_update_aux(struct fscache_cookie *cookie, const void *aux_data)
-{
- void *p;
-
- if (!aux_data)
- return;
- if (cookie->aux_len <= sizeof(cookie->inline_aux))
- p = cookie->inline_aux;
- else
- p = cookie->aux;
-
- if (memcmp(p, aux_data, cookie->aux_len) != 0) {
- memcpy(p, aux_data, cookie->aux_len);
- set_bit(FSCACHE_COOKIE_AUX_UPDATED, &cookie->flags);
- }
-}
-
-/*****************************************************************************/
-/*
- * debug tracing
- */
-#define dbgprintk(FMT, ...) \
- printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
-
-#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
-#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
-#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
-
-#define kjournal(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
-
-#ifdef __KDEBUG
-#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
-#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
-#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
-
-#elif defined(CONFIG_FSCACHE_DEBUG)
-#define _enter(FMT, ...) \
-do { \
- if (__do_kdebug(ENTER)) \
- kenter(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#define _leave(FMT, ...) \
-do { \
- if (__do_kdebug(LEAVE)) \
- kleave(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#define _debug(FMT, ...) \
-do { \
- if (__do_kdebug(DEBUG)) \
- kdebug(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#else
-#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
-#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
-#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
-#endif
-
-/*
- * determine whether a particular optional debugging point should be logged
- * - we need to go through three steps to persuade cpp to correctly join the
- * shorthand in FSCACHE_DEBUG_LEVEL with its prefix
- */
-#define ____do_kdebug(LEVEL, POINT) \
- unlikely((fscache_debug & \
- (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
-#define ___do_kdebug(LEVEL, POINT) \
- ____do_kdebug(LEVEL, POINT)
-#define __do_kdebug(POINT) \
- ___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
-
-#define FSCACHE_DEBUG_CACHE 0
-#define FSCACHE_DEBUG_COOKIE 1
-#define FSCACHE_DEBUG_PAGE 2
-#define FSCACHE_DEBUG_OPERATION 3
-
-#define FSCACHE_POINT_ENTER 1
-#define FSCACHE_POINT_LEAVE 2
-#define FSCACHE_POINT_DEBUG 4
-
-#ifndef FSCACHE_DEBUG_LEVEL
-#define FSCACHE_DEBUG_LEVEL CACHE
-#endif
-
-/*
- * assertions
- */
-#if 1 /* defined(__KDEBUGALL) */
-
-#define ASSERT(X) \
-do { \
- if (unlikely(!(X))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTCMP(X, OP, Y) \
-do { \
- if (unlikely(!((X) OP (Y)))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- pr_err("%lx " #OP " %lx is false\n", \
- (unsigned long)(X), (unsigned long)(Y)); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTIF(C, X) \
-do { \
- if (unlikely((C) && !(X))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTIFCMP(C, X, OP, Y) \
-do { \
- if (unlikely((C) && !((X) OP (Y)))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- pr_err("%lx " #OP " %lx is false\n", \
- (unsigned long)(X), (unsigned long)(Y)); \
- BUG(); \
- } \
-} while (0)
-
-#else
-
-#define ASSERT(X) do {} while (0)
-#define ASSERTCMP(X, OP, Y) do {} while (0)
-#define ASSERTIF(C, X) do {} while (0)
-#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
-
-#endif /* assert or not */
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
deleted file mode 100644
index e633808ba813..000000000000
--- a/fs/fscache/io.c
+++ /dev/null
@@ -1,224 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Cache data I/O routines
- *
- * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL PAGE
-#include <linux/module.h>
-#define FSCACHE_USE_NEW_IO_API
-#define FSCACHE_USE_FALLBACK_IO_API
-#include <linux/fscache-cache.h>
-#include <linux/uio.h>
-#include <linux/bvec.h>
-#include <linux/slab.h>
-#include <linux/netfs.h>
-#include "internal.h"
-
-/*
- * Start a cache operation.
- * - we return:
- * -ENOMEM - out of memory, some pages may be being read
- * -ERESTARTSYS - interrupted, some pages may be being read
- * -ENOBUFS - no backing object or space available in which to cache any
- * pages not being read
- * -ENODATA - no data available in the backing object for some or all of
- * the pages
- * 0 - dispatched a read on all pages
- */
-int __fscache_begin_operation(struct netfs_cache_resources *cres,
- struct fscache_cookie *cookie,
- bool for_write)
-{
- struct fscache_operation *op;
- struct fscache_object *object;
- bool wake_cookie = false;
- int ret;
-
- _enter("c=%08x", cres->debug_id);
-
- if (for_write)
- fscache_stat(&fscache_n_stores);
- else
- fscache_stat(&fscache_n_retrievals);
-
- if (hlist_empty(&cookie->backing_objects))
- goto nobufs;
-
- if (test_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags)) {
- _leave(" = -ENOBUFS [invalidating]");
- return -ENOBUFS;
- }
-
- ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX);
-
- if (fscache_wait_for_deferred_lookup(cookie) < 0)
- return -ERESTARTSYS;
-
- op = kzalloc(sizeof(*op), GFP_KERNEL);
- if (!op)
- return -ENOMEM;
-
- fscache_operation_init(cookie, op, NULL, NULL, NULL);
- op->flags = FSCACHE_OP_MYTHREAD |
- (1UL << FSCACHE_OP_WAITING) |
- (1UL << FSCACHE_OP_UNUSE_COOKIE);
-
- trace_fscache_page_op(cookie, NULL, op, fscache_page_op_retr_multi);
-
- spin_lock(&cookie->lock);
-
- if (!fscache_cookie_enabled(cookie) ||
- hlist_empty(&cookie->backing_objects))
- goto nobufs_unlock;
- object = hlist_entry(cookie->backing_objects.first,
- struct fscache_object, cookie_link);
-
- __fscache_use_cookie(cookie);
- atomic_inc(&object->n_reads);
- __set_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags);
-
- if (fscache_submit_op(object, op) < 0)
- goto nobufs_unlock_dec;
- spin_unlock(&cookie->lock);
-
- /* we wait for the operation to become active, and then process it
- * *here*, in this thread, and not in the thread pool */
- if (for_write) {
- fscache_stat(&fscache_n_store_ops);
-
- ret = fscache_wait_for_operation_activation(
- object, op,
- __fscache_stat(&fscache_n_store_op_waits),
- __fscache_stat(&fscache_n_stores_object_dead));
- } else {
- fscache_stat(&fscache_n_retrieval_ops);
-
- ret = fscache_wait_for_operation_activation(
- object, op,
- __fscache_stat(&fscache_n_retrieval_op_waits),
- __fscache_stat(&fscache_n_retrievals_object_dead));
- }
- if (ret < 0)
- goto error;
-
- /* ask the cache to honour the operation */
- ret = object->cache->ops->begin_operation(cres, op);
-
-error:
- if (for_write) {
- if (ret == -ENOMEM)
- fscache_stat(&fscache_n_stores_oom);
- else if (ret == -ERESTARTSYS)
- fscache_stat(&fscache_n_stores_intr);
- else if (ret < 0)
- fscache_stat(&fscache_n_stores_nobufs);
- else
- fscache_stat(&fscache_n_stores_ok);
- } else {
- if (ret == -ENOMEM)
- fscache_stat(&fscache_n_retrievals_nomem);
- else if (ret == -ERESTARTSYS)
- fscache_stat(&fscache_n_retrievals_intr);
- else if (ret == -ENODATA)
- fscache_stat(&fscache_n_retrievals_nodata);
- else if (ret < 0)
- fscache_stat(&fscache_n_retrievals_nobufs);
- else
- fscache_stat(&fscache_n_retrievals_ok);
- }
-
- fscache_put_operation(op);
- _leave(" = %d", ret);
- return ret;
-
-nobufs_unlock_dec:
- atomic_dec(&object->n_reads);
- wake_cookie = __fscache_unuse_cookie(cookie);
-nobufs_unlock:
- spin_unlock(&cookie->lock);
- fscache_put_operation(op);
- if (wake_cookie)
- __fscache_wake_unused_cookie(cookie);
-nobufs:
- if (for_write)
- fscache_stat(&fscache_n_stores_nobufs);
- else
- fscache_stat(&fscache_n_retrievals_nobufs);
- _leave(" = -ENOBUFS");
- return -ENOBUFS;
-}
-EXPORT_SYMBOL(__fscache_begin_operation);
-
-/*
- * Clean up an operation.
- */
-static void fscache_end_operation(struct netfs_cache_resources *cres)
-{
- cres->ops->end_operation(cres);
-}
-
-/*
- * Fallback page reading interface.
- */
-int __fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page)
-{
- struct netfs_cache_resources cres;
- struct iov_iter iter;
- struct bio_vec bvec[1];
- int ret;
-
- _enter("%lx", page->index);
-
- memset(&cres, 0, sizeof(cres));
- bvec[0].bv_page = page;
- bvec[0].bv_offset = 0;
- bvec[0].bv_len = PAGE_SIZE;
- iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
-
- ret = fscache_begin_read_operation(&cres, cookie);
- if (ret < 0)
- return ret;
-
- ret = fscache_read(&cres, page_offset(page), &iter, NETFS_READ_HOLE_FAIL,
- NULL, NULL);
- fscache_end_operation(&cres);
- _leave(" = %d", ret);
- return ret;
-}
-EXPORT_SYMBOL(__fscache_fallback_read_page);
-
-/*
- * Fallback page writing interface.
- */
-int __fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page)
-{
- struct netfs_cache_resources cres;
- struct iov_iter iter;
- struct bio_vec bvec[1];
- int ret;
-
- _enter("%lx", page->index);
-
- memset(&cres, 0, sizeof(cres));
- bvec[0].bv_page = page;
- bvec[0].bv_offset = 0;
- bvec[0].bv_len = PAGE_SIZE;
- iov_iter_bvec(&iter, WRITE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
-
- ret = __fscache_begin_operation(&cres, cookie, true);
- if (ret < 0)
- return ret;
-
- ret = cres.ops->prepare_fallback_write(&cres, page_index(page));
- if (ret < 0)
- goto out;
-
- ret = fscache_write(&cres, page_offset(page), &iter, NULL, NULL);
-out:
- fscache_end_operation(&cres);
- _leave(" = %d", ret);
- return ret;
-}
-EXPORT_SYMBOL(__fscache_fallback_write_page);
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
deleted file mode 100644
index 4207f98e405f..000000000000
--- a/fs/fscache/main.c
+++ /dev/null
@@ -1,230 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* General filesystem local caching manager
- *
- * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL CACHE
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/seq_file.h>
-#define CREATE_TRACE_POINTS
-#include "internal.h"
-
-MODULE_DESCRIPTION("FS Cache Manager");
-MODULE_AUTHOR("Red Hat, Inc.");
-MODULE_LICENSE("GPL");
-
-unsigned fscache_defer_lookup = 1;
-module_param_named(defer_lookup, fscache_defer_lookup, uint,
- S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(fscache_defer_lookup,
- "Defer cookie lookup to background thread");
-
-unsigned fscache_defer_create = 1;
-module_param_named(defer_create, fscache_defer_create, uint,
- S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(fscache_defer_create,
- "Defer cookie creation to background thread");
-
-unsigned fscache_debug;
-module_param_named(debug, fscache_debug, uint,
- S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(fscache_debug,
- "FS-Cache debugging mask");
-
-struct kobject *fscache_root;
-struct workqueue_struct *fscache_object_wq;
-struct workqueue_struct *fscache_op_wq;
-
-DEFINE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
-
-/* these values serve as lower bounds, will be adjusted in fscache_init() */
-static unsigned fscache_object_max_active = 4;
-static unsigned fscache_op_max_active = 2;
-
-#ifdef CONFIG_SYSCTL
-static struct ctl_table_header *fscache_sysctl_header;
-
-static int fscache_max_active_sysctl(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- struct workqueue_struct **wqp = table->extra1;
- unsigned int *datap = table->data;
- int ret;
-
- ret = proc_dointvec(table, write, buffer, lenp, ppos);
- if (ret == 0)
- workqueue_set_max_active(*wqp, *datap);
- return ret;
-}
-
-static struct ctl_table fscache_sysctls[] = {
- {
- .procname = "object_max_active",
- .data = &fscache_object_max_active,
- .maxlen = sizeof(unsigned),
- .mode = 0644,
- .proc_handler = fscache_max_active_sysctl,
- .extra1 = &fscache_object_wq,
- },
- {
- .procname = "operation_max_active",
- .data = &fscache_op_max_active,
- .maxlen = sizeof(unsigned),
- .mode = 0644,
- .proc_handler = fscache_max_active_sysctl,
- .extra1 = &fscache_op_wq,
- },
- {}
-};
-
-static struct ctl_table fscache_sysctls_root[] = {
- {
- .procname = "fscache",
- .mode = 0555,
- .child = fscache_sysctls,
- },
- {}
-};
-#endif
-
-/*
- * Mixing scores (in bits) for (7,20):
- * Input delta: 1-bit 2-bit
- * 1 round: 330.3 9201.6
- * 2 rounds: 1246.4 25475.4
- * 3 rounds: 1907.1 31295.1
- * 4 rounds: 2042.3 31718.6
- * Perfect: 2048 31744
- * (32*64) (32*31/2 * 64)
- */
-#define HASH_MIX(x, y, a) \
- ( x ^= (a), \
- y ^= x, x = rol32(x, 7),\
- x += y, y = rol32(y,20),\
- y *= 9 )
-
-static inline unsigned int fold_hash(unsigned long x, unsigned long y)
-{
- /* Use arch-optimized multiply if one exists */
- return __hash_32(y ^ __hash_32(x));
-}
-
-/*
- * Generate a hash. This is derived from full_name_hash(), but we want to be
- * sure it is arch independent and that it doesn't change as bits of the
- * computed hash value might appear on disk. The caller also guarantees that
- * the hashed data will be a series of aligned 32-bit words.
- */
-unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n)
-{
- unsigned int a, x = 0, y = salt;
-
- for (; n; n--) {
- a = *data++;
- HASH_MIX(x, y, a);
- }
- return fold_hash(x, y);
-}
-
-/*
- * initialise the fs caching module
- */
-static int __init fscache_init(void)
-{
- unsigned int nr_cpus = num_possible_cpus();
- unsigned int cpu;
- int ret;
-
- fscache_object_max_active =
- clamp_val(nr_cpus,
- fscache_object_max_active, WQ_UNBOUND_MAX_ACTIVE);
-
- ret = -ENOMEM;
- fscache_object_wq = alloc_workqueue("fscache_object", WQ_UNBOUND,
- fscache_object_max_active);
- if (!fscache_object_wq)
- goto error_object_wq;
-
- fscache_op_max_active =
- clamp_val(fscache_object_max_active / 2,
- fscache_op_max_active, WQ_UNBOUND_MAX_ACTIVE);
-
- ret = -ENOMEM;
- fscache_op_wq = alloc_workqueue("fscache_operation", WQ_UNBOUND,
- fscache_op_max_active);
- if (!fscache_op_wq)
- goto error_op_wq;
-
- for_each_possible_cpu(cpu)
- init_waitqueue_head(&per_cpu(fscache_object_cong_wait, cpu));
-
- ret = fscache_proc_init();
- if (ret < 0)
- goto error_proc;
-
-#ifdef CONFIG_SYSCTL
- ret = -ENOMEM;
- fscache_sysctl_header = register_sysctl_table(fscache_sysctls_root);
- if (!fscache_sysctl_header)
- goto error_sysctl;
-#endif
-
- fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar",
- sizeof(struct fscache_cookie),
- 0, 0, NULL);
- if (!fscache_cookie_jar) {
- pr_notice("Failed to allocate a cookie jar\n");
- ret = -ENOMEM;
- goto error_cookie_jar;
- }
-
- fscache_root = kobject_create_and_add("fscache", kernel_kobj);
- if (!fscache_root)
- goto error_kobj;
-
- pr_notice("Loaded\n");
- return 0;
-
-error_kobj:
- kmem_cache_destroy(fscache_cookie_jar);
-error_cookie_jar:
-#ifdef CONFIG_SYSCTL
- unregister_sysctl_table(fscache_sysctl_header);
-error_sysctl:
-#endif
- fscache_proc_cleanup();
-error_proc:
- destroy_workqueue(fscache_op_wq);
-error_op_wq:
- destroy_workqueue(fscache_object_wq);
-error_object_wq:
- return ret;
-}
-
-fs_initcall(fscache_init);
-
-/*
- * clean up on module removal
- */
-static void __exit fscache_exit(void)
-{
- _enter("");
-
- kobject_put(fscache_root);
- kmem_cache_destroy(fscache_cookie_jar);
-#ifdef CONFIG_SYSCTL
- unregister_sysctl_table(fscache_sysctl_header);
-#endif
- fscache_proc_cleanup();
- destroy_workqueue(fscache_op_wq);
- destroy_workqueue(fscache_object_wq);
- pr_notice("Unloaded\n");
-}
-
-module_exit(fscache_exit);
diff --git a/fs/fscache/netfs.c b/fs/fscache/netfs.c
deleted file mode 100644
index d6bdb7b5e723..000000000000
--- a/fs/fscache/netfs.c
+++ /dev/null
@@ -1,74 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache netfs (client) registration
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL COOKIE
-#include <linux/module.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-/*
- * register a network filesystem for caching
- */
-int __fscache_register_netfs(struct fscache_netfs *netfs)
-{
- struct fscache_cookie *candidate, *cookie;
-
- _enter("{%s}", netfs->name);
-
- /* allocate a cookie for the primary index */
- candidate = fscache_alloc_cookie(&fscache_fsdef_index,
- &fscache_fsdef_netfs_def,
- netfs->name, strlen(netfs->name),
- &netfs->version, sizeof(netfs->version),
- netfs, 0);
- if (!candidate) {
- _leave(" = -ENOMEM");
- return -ENOMEM;
- }
-
- candidate->flags = 1 << FSCACHE_COOKIE_ENABLED;
-
- /* check the netfs type is not already present */
- cookie = fscache_hash_cookie(candidate);
- if (!cookie)
- goto already_registered;
- if (cookie != candidate) {
- trace_fscache_cookie(candidate->debug_id, 1, fscache_cookie_discard);
- fscache_free_cookie(candidate);
- }
-
- fscache_cookie_get(cookie->parent, fscache_cookie_get_register_netfs);
- atomic_inc(&cookie->parent->n_children);
-
- netfs->primary_index = cookie;
-
- pr_notice("Netfs '%s' registered for caching\n", netfs->name);
- trace_fscache_netfs(netfs);
- _leave(" = 0");
- return 0;
-
-already_registered:
- fscache_cookie_put(candidate, fscache_cookie_put_dup_netfs);
- _leave(" = -EEXIST");
- return -EEXIST;
-}
-EXPORT_SYMBOL(__fscache_register_netfs);
-
-/*
- * unregister a network filesystem from the cache
- * - all cookies must have been released first
- */
-void __fscache_unregister_netfs(struct fscache_netfs *netfs)
-{
- _enter("{%s.%u}", netfs->name, netfs->version);
-
- fscache_relinquish_cookie(netfs->primary_index, NULL, false);
- pr_notice("Netfs '%s' unregistered from caching\n", netfs->name);
-
- _leave("");
-}
-EXPORT_SYMBOL(__fscache_unregister_netfs);
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
deleted file mode 100644
index 86ad941726f7..000000000000
--- a/fs/fscache/object.c
+++ /dev/null
@@ -1,1123 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache object state machine handler
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * See Documentation/filesystems/caching/object.rst for a description of the
- * object state machine and the in-kernel representations.
- */
-
-#define FSCACHE_DEBUG_LEVEL COOKIE
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/prefetch.h>
-#include "internal.h"
-
-static const struct fscache_state *fscache_abort_initialisation(struct fscache_object *, int);
-static const struct fscache_state *fscache_kill_dependents(struct fscache_object *, int);
-static const struct fscache_state *fscache_drop_object(struct fscache_object *, int);
-static const struct fscache_state *fscache_initialise_object(struct fscache_object *, int);
-static const struct fscache_state *fscache_invalidate_object(struct fscache_object *, int);
-static const struct fscache_state *fscache_jumpstart_dependents(struct fscache_object *, int);
-static const struct fscache_state *fscache_kill_object(struct fscache_object *, int);
-static const struct fscache_state *fscache_lookup_failure(struct fscache_object *, int);
-static const struct fscache_state *fscache_look_up_object(struct fscache_object *, int);
-static const struct fscache_state *fscache_object_available(struct fscache_object *, int);
-static const struct fscache_state *fscache_parent_ready(struct fscache_object *, int);
-static const struct fscache_state *fscache_update_object(struct fscache_object *, int);
-static const struct fscache_state *fscache_object_dead(struct fscache_object *, int);
-
-#define __STATE_NAME(n) fscache_osm_##n
-#define STATE(n) (&__STATE_NAME(n))
-
-/*
- * Define a work state. Work states are execution states. No event processing
- * is performed by them. The function attached to a work state returns a
- * pointer indicating the next state to which the state machine should
- * transition. Returning NO_TRANSIT repeats the current state, but goes back
- * to the scheduler first.
- */
-#define WORK_STATE(n, sn, f) \
- const struct fscache_state __STATE_NAME(n) = { \
- .name = #n, \
- .short_name = sn, \
- .work = f \
- }
-
-/*
- * Returns from work states.
- */
-#define transit_to(state) ({ prefetch(&STATE(state)->work); STATE(state); })
-
-#define NO_TRANSIT ((struct fscache_state *)NULL)
-
-/*
- * Define a wait state. Wait states are event processing states. No execution
- * is performed by them. Wait states are just tables of "if event X occurs,
- * clear it and transition to state Y". The dispatcher returns to the
- * scheduler if none of the events in which the wait state has an interest are
- * currently pending.
- */
-#define WAIT_STATE(n, sn, ...) \
- const struct fscache_state __STATE_NAME(n) = { \
- .name = #n, \
- .short_name = sn, \
- .work = NULL, \
- .transitions = { __VA_ARGS__, { 0, NULL } } \
- }
-
-#define TRANSIT_TO(state, emask) \
- { .events = (emask), .transit_to = STATE(state) }
-
-/*
- * The object state machine.
- */
-static WORK_STATE(INIT_OBJECT, "INIT", fscache_initialise_object);
-static WORK_STATE(PARENT_READY, "PRDY", fscache_parent_ready);
-static WORK_STATE(ABORT_INIT, "ABRT", fscache_abort_initialisation);
-static WORK_STATE(LOOK_UP_OBJECT, "LOOK", fscache_look_up_object);
-static WORK_STATE(OBJECT_AVAILABLE, "AVBL", fscache_object_available);
-static WORK_STATE(JUMPSTART_DEPS, "JUMP", fscache_jumpstart_dependents);
-
-static WORK_STATE(INVALIDATE_OBJECT, "INVL", fscache_invalidate_object);
-static WORK_STATE(UPDATE_OBJECT, "UPDT", fscache_update_object);
-
-static WORK_STATE(LOOKUP_FAILURE, "LCFL", fscache_lookup_failure);
-static WORK_STATE(KILL_OBJECT, "KILL", fscache_kill_object);
-static WORK_STATE(KILL_DEPENDENTS, "KDEP", fscache_kill_dependents);
-static WORK_STATE(DROP_OBJECT, "DROP", fscache_drop_object);
-static WORK_STATE(OBJECT_DEAD, "DEAD", fscache_object_dead);
-
-static WAIT_STATE(WAIT_FOR_INIT, "?INI",
- TRANSIT_TO(INIT_OBJECT, 1 << FSCACHE_OBJECT_EV_NEW_CHILD));
-
-static WAIT_STATE(WAIT_FOR_PARENT, "?PRN",
- TRANSIT_TO(PARENT_READY, 1 << FSCACHE_OBJECT_EV_PARENT_READY));
-
-static WAIT_STATE(WAIT_FOR_CMD, "?CMD",
- TRANSIT_TO(INVALIDATE_OBJECT, 1 << FSCACHE_OBJECT_EV_INVALIDATE),
- TRANSIT_TO(UPDATE_OBJECT, 1 << FSCACHE_OBJECT_EV_UPDATE),
- TRANSIT_TO(JUMPSTART_DEPS, 1 << FSCACHE_OBJECT_EV_NEW_CHILD));
-
-static WAIT_STATE(WAIT_FOR_CLEARANCE, "?CLR",
- TRANSIT_TO(KILL_OBJECT, 1 << FSCACHE_OBJECT_EV_CLEARED));
-
-/*
- * Out-of-band event transition tables. These are for handling unexpected
- * events, such as an I/O error. If an OOB event occurs, the state machine
- * clears and disables the event and forces a transition to the nominated work
- * state (acurrently executing work states will complete first).
- *
- * In such a situation, object->state remembers the state the machine should
- * have been in/gone to and returning NO_TRANSIT returns to that.
- */
-static const struct fscache_transition fscache_osm_init_oob[] = {
- TRANSIT_TO(ABORT_INIT,
- (1 << FSCACHE_OBJECT_EV_ERROR) |
- (1 << FSCACHE_OBJECT_EV_KILL)),
- { 0, NULL }
-};
-
-static const struct fscache_transition fscache_osm_lookup_oob[] = {
- TRANSIT_TO(LOOKUP_FAILURE,
- (1 << FSCACHE_OBJECT_EV_ERROR) |
- (1 << FSCACHE_OBJECT_EV_KILL)),
- { 0, NULL }
-};
-
-static const struct fscache_transition fscache_osm_run_oob[] = {
- TRANSIT_TO(KILL_OBJECT,
- (1 << FSCACHE_OBJECT_EV_ERROR) |
- (1 << FSCACHE_OBJECT_EV_KILL)),
- { 0, NULL }
-};
-
-static int fscache_get_object(struct fscache_object *,
- enum fscache_obj_ref_trace);
-static void fscache_put_object(struct fscache_object *,
- enum fscache_obj_ref_trace);
-static bool fscache_enqueue_dependents(struct fscache_object *, int);
-static void fscache_dequeue_object(struct fscache_object *);
-static void fscache_update_aux_data(struct fscache_object *);
-
-/*
- * we need to notify the parent when an op completes that we had outstanding
- * upon it
- */
-static inline void fscache_done_parent_op(struct fscache_object *object)
-{
- struct fscache_object *parent = object->parent;
-
- _enter("OBJ%x {OBJ%x,%x}",
- object->debug_id, parent->debug_id, parent->n_ops);
-
- spin_lock_nested(&parent->lock, 1);
- parent->n_obj_ops--;
- parent->n_ops--;
- if (parent->n_ops == 0)
- fscache_raise_event(parent, FSCACHE_OBJECT_EV_CLEARED);
- spin_unlock(&parent->lock);
-}
-
-/*
- * Object state machine dispatcher.
- */
-static void fscache_object_sm_dispatcher(struct fscache_object *object)
-{
- const struct fscache_transition *t;
- const struct fscache_state *state, *new_state;
- unsigned long events, event_mask;
- bool oob;
- int event = -1;
-
- ASSERT(object != NULL);
-
- _enter("{OBJ%x,%s,%lx}",
- object->debug_id, object->state->name, object->events);
-
- event_mask = object->event_mask;
-restart:
- object->event_mask = 0; /* Mask normal event handling */
- state = object->state;
-restart_masked:
- events = object->events;
-
- /* Handle any out-of-band events (typically an error) */
- if (events & object->oob_event_mask) {
- _debug("{OBJ%x} oob %lx",
- object->debug_id, events & object->oob_event_mask);
- oob = true;
- for (t = object->oob_table; t->events; t++) {
- if (events & t->events) {
- state = t->transit_to;
- ASSERT(state->work != NULL);
- event = fls(events & t->events) - 1;
- __clear_bit(event, &object->oob_event_mask);
- clear_bit(event, &object->events);
- goto execute_work_state;
- }
- }
- }
- oob = false;
-
- /* Wait states are just transition tables */
- if (!state->work) {
- if (events & event_mask) {
- for (t = state->transitions; t->events; t++) {
- if (events & t->events) {
- new_state = t->transit_to;
- event = fls(events & t->events) - 1;
- trace_fscache_osm(object, state,
- true, false, event);
- clear_bit(event, &object->events);
- _debug("{OBJ%x} ev %d: %s -> %s",
- object->debug_id, event,
- state->name, new_state->name);
- object->state = state = new_state;
- goto execute_work_state;
- }
- }
-
- /* The event mask didn't include all the tabled bits */
- BUG();
- }
- /* Randomly woke up */
- goto unmask_events;
- }
-
-execute_work_state:
- _debug("{OBJ%x} exec %s", object->debug_id, state->name);
-
- trace_fscache_osm(object, state, false, oob, event);
- new_state = state->work(object, event);
- event = -1;
- if (new_state == NO_TRANSIT) {
- _debug("{OBJ%x} %s notrans", object->debug_id, state->name);
- if (unlikely(state == STATE(OBJECT_DEAD))) {
- _leave(" [dead]");
- return;
- }
- fscache_enqueue_object(object);
- event_mask = object->oob_event_mask;
- goto unmask_events;
- }
-
- _debug("{OBJ%x} %s -> %s",
- object->debug_id, state->name, new_state->name);
- object->state = state = new_state;
-
- if (state->work) {
- if (unlikely(state == STATE(OBJECT_DEAD))) {
- _leave(" [dead]");
- return;
- }
- goto restart_masked;
- }
-
- /* Transited to wait state */
- event_mask = object->oob_event_mask;
- for (t = state->transitions; t->events; t++)
- event_mask |= t->events;
-
-unmask_events:
- object->event_mask = event_mask;
- smp_mb();
- events = object->events;
- if (events & event_mask)
- goto restart;
- _leave(" [msk %lx]", event_mask);
-}
-
-/*
- * execute an object
- */
-static void fscache_object_work_func(struct work_struct *work)
-{
- struct fscache_object *object =
- container_of(work, struct fscache_object, work);
-
- _enter("{OBJ%x}", object->debug_id);
-
- fscache_object_sm_dispatcher(object);
- fscache_put_object(object, fscache_obj_put_work);
-}
-
-/**
- * fscache_object_init - Initialise a cache object description
- * @object: Object description
- * @cookie: Cookie object will be attached to
- * @cache: Cache in which backing object will be found
- *
- * Initialise a cache object description to its basic values.
- *
- * See Documentation/filesystems/caching/backend-api.rst for a complete
- * description.
- */
-void fscache_object_init(struct fscache_object *object,
- struct fscache_cookie *cookie,
- struct fscache_cache *cache)
-{
- const struct fscache_transition *t;
-
- atomic_inc(&cache->object_count);
-
- object->state = STATE(WAIT_FOR_INIT);
- object->oob_table = fscache_osm_init_oob;
- object->flags = 1 << FSCACHE_OBJECT_IS_LIVE;
- spin_lock_init(&object->lock);
- INIT_LIST_HEAD(&object->cache_link);
- INIT_HLIST_NODE(&object->cookie_link);
- INIT_WORK(&object->work, fscache_object_work_func);
- INIT_LIST_HEAD(&object->dependents);
- INIT_LIST_HEAD(&object->dep_link);
- INIT_LIST_HEAD(&object->pending_ops);
- object->n_children = 0;
- object->n_ops = object->n_in_progress = object->n_exclusive = 0;
- object->events = 0;
- object->store_limit = 0;
- object->store_limit_l = 0;
- object->cache = cache;
- object->cookie = cookie;
- fscache_cookie_get(cookie, fscache_cookie_get_attach_object);
- object->parent = NULL;
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
- RB_CLEAR_NODE(&object->objlist_link);
-#endif
-
- object->oob_event_mask = 0;
- for (t = object->oob_table; t->events; t++)
- object->oob_event_mask |= t->events;
- object->event_mask = object->oob_event_mask;
- for (t = object->state->transitions; t->events; t++)
- object->event_mask |= t->events;
-}
-EXPORT_SYMBOL(fscache_object_init);
-
-/*
- * Mark the object as no longer being live, making sure that we synchronise
- * against op submission.
- */
-static inline void fscache_mark_object_dead(struct fscache_object *object)
-{
- spin_lock(&object->lock);
- clear_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
- spin_unlock(&object->lock);
-}
-
-/*
- * Abort object initialisation before we start it.
- */
-static const struct fscache_state *fscache_abort_initialisation(struct fscache_object *object,
- int event)
-{
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- object->oob_event_mask = 0;
- fscache_dequeue_object(object);
- return transit_to(KILL_OBJECT);
-}
-
-/*
- * initialise an object
- * - check the specified object's parent to see if we can make use of it
- * immediately to do a creation
- * - we may need to start the process of creating a parent and we need to wait
- * for the parent's lookup and creation to complete if it's not there yet
- */
-static const struct fscache_state *fscache_initialise_object(struct fscache_object *object,
- int event)
-{
- struct fscache_object *parent;
- bool success;
-
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- ASSERT(list_empty(&object->dep_link));
-
- parent = object->parent;
- if (!parent) {
- _leave(" [no parent]");
- return transit_to(DROP_OBJECT);
- }
-
- _debug("parent: %s of:%lx", parent->state->name, parent->flags);
-
- if (fscache_object_is_dying(parent)) {
- _leave(" [bad parent]");
- return transit_to(DROP_OBJECT);
- }
-
- if (fscache_object_is_available(parent)) {
- _leave(" [ready]");
- return transit_to(PARENT_READY);
- }
-
- _debug("wait");
-
- spin_lock(&parent->lock);
- fscache_stat(&fscache_n_cop_grab_object);
- success = false;
- if (fscache_object_is_live(parent) &&
- object->cache->ops->grab_object(object, fscache_obj_get_add_to_deps)) {
- list_add(&object->dep_link, &parent->dependents);
- success = true;
- }
- fscache_stat_d(&fscache_n_cop_grab_object);
- spin_unlock(&parent->lock);
- if (!success) {
- _leave(" [grab failed]");
- return transit_to(DROP_OBJECT);
- }
-
- /* fscache_acquire_non_index_cookie() uses this
- * to wake the chain up */
- fscache_raise_event(parent, FSCACHE_OBJECT_EV_NEW_CHILD);
- _leave(" [wait]");
- return transit_to(WAIT_FOR_PARENT);
-}
-
-/*
- * Once the parent object is ready, we should kick off our lookup op.
- */
-static const struct fscache_state *fscache_parent_ready(struct fscache_object *object,
- int event)
-{
- struct fscache_object *parent = object->parent;
-
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- ASSERT(parent != NULL);
-
- spin_lock(&parent->lock);
- parent->n_ops++;
- parent->n_obj_ops++;
- spin_unlock(&parent->lock);
-
- _leave("");
- return transit_to(LOOK_UP_OBJECT);
-}
-
-/*
- * look an object up in the cache from which it was allocated
- * - we hold an "access lock" on the parent object, so the parent object cannot
- * be withdrawn by either party till we've finished
- */
-static const struct fscache_state *fscache_look_up_object(struct fscache_object *object,
- int event)
-{
- struct fscache_cookie *cookie = object->cookie;
- struct fscache_object *parent = object->parent;
- int ret;
-
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- object->oob_table = fscache_osm_lookup_oob;
-
- ASSERT(parent != NULL);
- ASSERTCMP(parent->n_ops, >, 0);
- ASSERTCMP(parent->n_obj_ops, >, 0);
-
- /* make sure the parent is still available */
- ASSERT(fscache_object_is_available(parent));
-
- if (fscache_object_is_dying(parent) ||
- test_bit(FSCACHE_IOERROR, &object->cache->flags) ||
- !fscache_use_cookie(object)) {
- _leave(" [unavailable]");
- return transit_to(LOOKUP_FAILURE);
- }
-
- _debug("LOOKUP \"%s\" in \"%s\"",
- cookie->def->name, object->cache->tag->name);
-
- fscache_stat(&fscache_n_object_lookups);
- fscache_stat(&fscache_n_cop_lookup_object);
- ret = object->cache->ops->lookup_object(object);
- fscache_stat_d(&fscache_n_cop_lookup_object);
-
- fscache_unuse_cookie(object);
-
- if (ret == -ETIMEDOUT) {
- /* probably stuck behind another object, so move this one to
- * the back of the queue */
- fscache_stat(&fscache_n_object_lookups_timed_out);
- _leave(" [timeout]");
- return NO_TRANSIT;
- }
-
- if (ret < 0) {
- _leave(" [error]");
- return transit_to(LOOKUP_FAILURE);
- }
-
- _leave(" [ok]");
- return transit_to(OBJECT_AVAILABLE);
-}
-
-/**
- * fscache_object_lookup_negative - Note negative cookie lookup
- * @object: Object pointing to cookie to mark
- *
- * Note negative lookup, permitting those waiting to read data from an already
- * existing backing object to continue as there's no data for them to read.
- */
-void fscache_object_lookup_negative(struct fscache_object *object)
-{
- struct fscache_cookie *cookie = object->cookie;
-
- _enter("{OBJ%x,%s}", object->debug_id, object->state->name);
-
- if (!test_and_set_bit(FSCACHE_OBJECT_IS_LOOKED_UP, &object->flags)) {
- fscache_stat(&fscache_n_object_lookups_negative);
-
- /* Allow write requests to begin stacking up and read requests to begin
- * returning ENODATA.
- */
- set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
- clear_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
-
- clear_bit_unlock(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
- }
- _leave("");
-}
-EXPORT_SYMBOL(fscache_object_lookup_negative);
-
-/**
- * fscache_obtained_object - Note successful object lookup or creation
- * @object: Object pointing to cookie to mark
- *
- * Note successful lookup and/or creation, permitting those waiting to write
- * data to a backing object to continue.
- *
- * Note that after calling this, an object's cookie may be relinquished by the
- * netfs, and so must be accessed with object lock held.
- */
-void fscache_obtained_object(struct fscache_object *object)
-{
- struct fscache_cookie *cookie = object->cookie;
-
- _enter("{OBJ%x,%s}", object->debug_id, object->state->name);
-
- /* if we were still looking up, then we must have a positive lookup
- * result, in which case there may be data available */
- if (!test_and_set_bit(FSCACHE_OBJECT_IS_LOOKED_UP, &object->flags)) {
- fscache_stat(&fscache_n_object_lookups_positive);
-
- /* We do (presumably) have data */
- clear_bit_unlock(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
- clear_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
-
- /* Allow write requests to begin stacking up and read requests
- * to begin shovelling data.
- */
- clear_bit_unlock(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
- } else {
- fscache_stat(&fscache_n_object_created);
- }
-
- set_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
- _leave("");
-}
-EXPORT_SYMBOL(fscache_obtained_object);
-
-/*
- * handle an object that has just become available
- */
-static const struct fscache_state *fscache_object_available(struct fscache_object *object,
- int event)
-{
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- object->oob_table = fscache_osm_run_oob;
-
- spin_lock(&object->lock);
-
- fscache_done_parent_op(object);
- if (object->n_in_progress == 0) {
- if (object->n_ops > 0) {
- ASSERTCMP(object->n_ops, >=, object->n_obj_ops);
- fscache_start_operations(object);
- } else {
- ASSERT(list_empty(&object->pending_ops));
- }
- }
- spin_unlock(&object->lock);
-
- fscache_stat(&fscache_n_cop_lookup_complete);
- object->cache->ops->lookup_complete(object);
- fscache_stat_d(&fscache_n_cop_lookup_complete);
-
- fscache_stat(&fscache_n_object_avail);
-
- _leave("");
- return transit_to(JUMPSTART_DEPS);
-}
-
-/*
- * Wake up this object's dependent objects now that we've become available.
- */
-static const struct fscache_state *fscache_jumpstart_dependents(struct fscache_object *object,
- int event)
-{
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- if (!fscache_enqueue_dependents(object, FSCACHE_OBJECT_EV_PARENT_READY))
- return NO_TRANSIT; /* Not finished; requeue */
- return transit_to(WAIT_FOR_CMD);
-}
-
-/*
- * Handle lookup or creation failute.
- */
-static const struct fscache_state *fscache_lookup_failure(struct fscache_object *object,
- int event)
-{
- struct fscache_cookie *cookie;
-
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- object->oob_event_mask = 0;
-
- fscache_stat(&fscache_n_cop_lookup_complete);
- object->cache->ops->lookup_complete(object);
- fscache_stat_d(&fscache_n_cop_lookup_complete);
-
- set_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->flags);
-
- cookie = object->cookie;
- set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
- if (test_and_clear_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags))
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
-
- fscache_done_parent_op(object);
- return transit_to(KILL_OBJECT);
-}
-
-/*
- * Wait for completion of all active operations on this object and the death of
- * all child objects of this object.
- */
-static const struct fscache_state *fscache_kill_object(struct fscache_object *object,
- int event)
-{
- _enter("{OBJ%x,%d,%d},%d",
- object->debug_id, object->n_ops, object->n_children, event);
-
- fscache_mark_object_dead(object);
- object->oob_event_mask = 0;
-
- if (test_bit(FSCACHE_OBJECT_RETIRED, &object->flags)) {
- /* Reject any new read/write ops and abort any that are pending. */
- clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
- fscache_cancel_all_ops(object);
- }
-
- if (list_empty(&object->dependents) &&
- object->n_ops == 0 &&
- object->n_children == 0)
- return transit_to(DROP_OBJECT);
-
- if (object->n_in_progress == 0) {
- spin_lock(&object->lock);
- if (object->n_ops > 0 && object->n_in_progress == 0)
- fscache_start_operations(object);
- spin_unlock(&object->lock);
- }
-
- if (!list_empty(&object->dependents))
- return transit_to(KILL_DEPENDENTS);
-
- return transit_to(WAIT_FOR_CLEARANCE);
-}
-
-/*
- * Kill dependent objects.
- */
-static const struct fscache_state *fscache_kill_dependents(struct fscache_object *object,
- int event)
-{
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- if (!fscache_enqueue_dependents(object, FSCACHE_OBJECT_EV_KILL))
- return NO_TRANSIT; /* Not finished */
- return transit_to(WAIT_FOR_CLEARANCE);
-}
-
-/*
- * Drop an object's attachments
- */
-static const struct fscache_state *fscache_drop_object(struct fscache_object *object,
- int event)
-{
- struct fscache_object *parent = object->parent;
- struct fscache_cookie *cookie = object->cookie;
- struct fscache_cache *cache = object->cache;
- bool awaken = false;
-
- _enter("{OBJ%x,%d},%d", object->debug_id, object->n_children, event);
-
- ASSERT(cookie != NULL);
- ASSERT(!hlist_unhashed(&object->cookie_link));
-
- if (test_bit(FSCACHE_COOKIE_AUX_UPDATED, &cookie->flags)) {
- _debug("final update");
- fscache_update_aux_data(object);
- }
-
- /* Make sure the cookie no longer points here and that the netfs isn't
- * waiting for us.
- */
- spin_lock(&cookie->lock);
- hlist_del_init(&object->cookie_link);
- if (hlist_empty(&cookie->backing_objects) &&
- test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
- awaken = true;
- spin_unlock(&cookie->lock);
-
- if (awaken)
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
- if (test_and_clear_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags))
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
-
-
- /* Prevent a race with our last child, which has to signal EV_CLEARED
- * before dropping our spinlock.
- */
- spin_lock(&object->lock);
- spin_unlock(&object->lock);
-
- /* Discard from the cache's collection of objects */
- spin_lock(&cache->object_list_lock);
- list_del_init(&object->cache_link);
- spin_unlock(&cache->object_list_lock);
-
- fscache_stat(&fscache_n_cop_drop_object);
- cache->ops->drop_object(object);
- fscache_stat_d(&fscache_n_cop_drop_object);
-
- /* The parent object wants to know when all it dependents have gone */
- if (parent) {
- _debug("release parent OBJ%x {%d}",
- parent->debug_id, parent->n_children);
-
- spin_lock(&parent->lock);
- parent->n_children--;
- if (parent->n_children == 0)
- fscache_raise_event(parent, FSCACHE_OBJECT_EV_CLEARED);
- spin_unlock(&parent->lock);
- object->parent = NULL;
- }
-
- /* this just shifts the object release to the work processor */
- fscache_put_object(object, fscache_obj_put_drop_obj);
- fscache_stat(&fscache_n_object_dead);
-
- _leave("");
- return transit_to(OBJECT_DEAD);
-}
-
-/*
- * get a ref on an object
- */
-static int fscache_get_object(struct fscache_object *object,
- enum fscache_obj_ref_trace why)
-{
- int ret;
-
- fscache_stat(&fscache_n_cop_grab_object);
- ret = object->cache->ops->grab_object(object, why) ? 0 : -EAGAIN;
- fscache_stat_d(&fscache_n_cop_grab_object);
- return ret;
-}
-
-/*
- * Discard a ref on an object
- */
-static void fscache_put_object(struct fscache_object *object,
- enum fscache_obj_ref_trace why)
-{
- fscache_stat(&fscache_n_cop_put_object);
- object->cache->ops->put_object(object, why);
- fscache_stat_d(&fscache_n_cop_put_object);
-}
-
-/**
- * fscache_object_destroy - Note that a cache object is about to be destroyed
- * @object: The object to be destroyed
- *
- * Note the imminent destruction and deallocation of a cache object record.
- */
-void fscache_object_destroy(struct fscache_object *object)
-{
- /* We can get rid of the cookie now */
- fscache_cookie_put(object->cookie, fscache_cookie_put_object);
- object->cookie = NULL;
-}
-EXPORT_SYMBOL(fscache_object_destroy);
-
-/*
- * enqueue an object for metadata-type processing
- */
-void fscache_enqueue_object(struct fscache_object *object)
-{
- _enter("{OBJ%x}", object->debug_id);
-
- if (fscache_get_object(object, fscache_obj_get_queue) >= 0) {
- wait_queue_head_t *cong_wq =
- &get_cpu_var(fscache_object_cong_wait);
-
- if (queue_work(fscache_object_wq, &object->work)) {
- if (fscache_object_congested())
- wake_up(cong_wq);
- } else
- fscache_put_object(object, fscache_obj_put_queue);
-
- put_cpu_var(fscache_object_cong_wait);
- }
-}
-
-/**
- * fscache_object_sleep_till_congested - Sleep until object wq is congested
- * @timeoutp: Scheduler sleep timeout
- *
- * Allow an object handler to sleep until the object workqueue is congested.
- *
- * The caller must set up a wake up event before calling this and must have set
- * the appropriate sleep mode (such as TASK_UNINTERRUPTIBLE) and tested its own
- * condition before calling this function as no test is made here.
- *
- * %true is returned if the object wq is congested, %false otherwise.
- */
-bool fscache_object_sleep_till_congested(signed long *timeoutp)
-{
- wait_queue_head_t *cong_wq = this_cpu_ptr(&fscache_object_cong_wait);
- DEFINE_WAIT(wait);
-
- if (fscache_object_congested())
- return true;
-
- add_wait_queue_exclusive(cong_wq, &wait);
- if (!fscache_object_congested())
- *timeoutp = schedule_timeout(*timeoutp);
- finish_wait(cong_wq, &wait);
-
- return fscache_object_congested();
-}
-EXPORT_SYMBOL_GPL(fscache_object_sleep_till_congested);
-
-/*
- * Enqueue the dependents of an object for metadata-type processing.
- *
- * If we don't manage to finish the list before the scheduler wants to run
- * again then return false immediately. We return true if the list was
- * cleared.
- */
-static bool fscache_enqueue_dependents(struct fscache_object *object, int event)
-{
- struct fscache_object *dep;
- bool ret = true;
-
- _enter("{OBJ%x}", object->debug_id);
-
- if (list_empty(&object->dependents))
- return true;
-
- spin_lock(&object->lock);
-
- while (!list_empty(&object->dependents)) {
- dep = list_entry(object->dependents.next,
- struct fscache_object, dep_link);
- list_del_init(&dep->dep_link);
-
- fscache_raise_event(dep, event);
- fscache_put_object(dep, fscache_obj_put_enq_dep);
-
- if (!list_empty(&object->dependents) && need_resched()) {
- ret = false;
- break;
- }
- }
-
- spin_unlock(&object->lock);
- return ret;
-}
-
-/*
- * remove an object from whatever queue it's waiting on
- */
-static void fscache_dequeue_object(struct fscache_object *object)
-{
- _enter("{OBJ%x}", object->debug_id);
-
- if (!list_empty(&object->dep_link)) {
- spin_lock(&object->parent->lock);
- list_del_init(&object->dep_link);
- spin_unlock(&object->parent->lock);
- }
-
- _leave("");
-}
-
-/**
- * fscache_check_aux - Ask the netfs whether an object on disk is still valid
- * @object: The object to ask about
- * @data: The auxiliary data for the object
- * @datalen: The size of the auxiliary data
- * @object_size: The size of the object according to the server.
- *
- * This function consults the netfs about the coherency state of an object.
- * The caller must be holding a ref on cookie->n_active (held by
- * fscache_look_up_object() on behalf of the cache backend during object lookup
- * and creation).
- */
-enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
- const void *data, uint16_t datalen,
- loff_t object_size)
-{
- enum fscache_checkaux result;
-
- if (!object->cookie->def->check_aux) {
- fscache_stat(&fscache_n_checkaux_none);
- return FSCACHE_CHECKAUX_OKAY;
- }
-
- result = object->cookie->def->check_aux(object->cookie->netfs_data,
- data, datalen, object_size);
- switch (result) {
- /* entry okay as is */
- case FSCACHE_CHECKAUX_OKAY:
- fscache_stat(&fscache_n_checkaux_okay);
- break;
-
- /* entry requires update */
- case FSCACHE_CHECKAUX_NEEDS_UPDATE:
- fscache_stat(&fscache_n_checkaux_update);
- break;
-
- /* entry requires deletion */
- case FSCACHE_CHECKAUX_OBSOLETE:
- fscache_stat(&fscache_n_checkaux_obsolete);
- break;
-
- default:
- BUG();
- }
-
- return result;
-}
-EXPORT_SYMBOL(fscache_check_aux);
-
-/*
- * Asynchronously invalidate an object.
- */
-static const struct fscache_state *_fscache_invalidate_object(struct fscache_object *object,
- int event)
-{
- struct fscache_operation *op;
- struct fscache_cookie *cookie = object->cookie;
-
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- /* We're going to need the cookie. If the cookie is not available then
- * retire the object instead.
- */
- if (!fscache_use_cookie(object)) {
- set_bit(FSCACHE_OBJECT_RETIRED, &object->flags);
- _leave(" [no cookie]");
- return transit_to(KILL_OBJECT);
- }
-
- /* Reject any new read/write ops and abort any that are pending. */
- clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
- fscache_cancel_all_ops(object);
-
- /* Now we have to wait for in-progress reads and writes */
- op = kzalloc(sizeof(*op), GFP_KERNEL);
- if (!op)
- goto nomem;
-
- fscache_operation_init(cookie, op, object->cache->ops->invalidate_object,
- NULL, NULL);
- op->flags = FSCACHE_OP_ASYNC |
- (1 << FSCACHE_OP_EXCLUSIVE) |
- (1 << FSCACHE_OP_UNUSE_COOKIE);
- trace_fscache_page_op(cookie, NULL, op, fscache_page_op_invalidate);
-
- spin_lock(&cookie->lock);
- if (fscache_submit_exclusive_op(object, op) < 0)
- goto submit_op_failed;
- spin_unlock(&cookie->lock);
- fscache_put_operation(op);
-
- /* Once we've completed the invalidation, we know there will be no data
- * stored in the cache and thus we can reinstate the data-check-skip
- * optimisation.
- */
- set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
-
- /* We can allow read and write requests to come in once again. They'll
- * queue up behind our exclusive invalidation operation.
- */
- if (test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
- wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
- _leave(" [ok]");
- return transit_to(UPDATE_OBJECT);
-
-nomem:
- fscache_mark_object_dead(object);
- fscache_unuse_cookie(object);
- _leave(" [ENOMEM]");
- return transit_to(KILL_OBJECT);
-
-submit_op_failed:
- fscache_mark_object_dead(object);
- spin_unlock(&cookie->lock);
- fscache_unuse_cookie(object);
- kfree(op);
- _leave(" [EIO]");
- return transit_to(KILL_OBJECT);
-}
-
-static const struct fscache_state *fscache_invalidate_object(struct fscache_object *object,
- int event)
-{
- const struct fscache_state *s;
-
- fscache_stat(&fscache_n_invalidates_run);
- fscache_stat(&fscache_n_cop_invalidate_object);
- s = _fscache_invalidate_object(object, event);
- fscache_stat_d(&fscache_n_cop_invalidate_object);
- return s;
-}
-
-/*
- * Update auxiliary data.
- */
-static void fscache_update_aux_data(struct fscache_object *object)
-{
- fscache_stat(&fscache_n_updates_run);
- fscache_stat(&fscache_n_cop_update_object);
- object->cache->ops->update_object(object);
- fscache_stat_d(&fscache_n_cop_update_object);
-}
-
-/*
- * Asynchronously update an object.
- */
-static const struct fscache_state *fscache_update_object(struct fscache_object *object,
- int event)
-{
- _enter("{OBJ%x},%d", object->debug_id, event);
-
- fscache_update_aux_data(object);
-
- _leave("");
- return transit_to(WAIT_FOR_CMD);
-}
-
-/**
- * fscache_object_retrying_stale - Note retrying stale object
- * @object: The object that will be retried
- *
- * Note that an object lookup found an on-disk object that was adjudged to be
- * stale and has been deleted. The lookup will be retried.
- */
-void fscache_object_retrying_stale(struct fscache_object *object)
-{
- fscache_stat(&fscache_n_cache_no_space_reject);
-}
-EXPORT_SYMBOL(fscache_object_retrying_stale);
-
-/**
- * fscache_object_mark_killed - Note that an object was killed
- * @object: The object that was culled
- * @why: The reason the object was killed.
- *
- * Note that an object was killed. Returns true if the object was
- * already marked killed, false if it wasn't.
- */
-void fscache_object_mark_killed(struct fscache_object *object,
- enum fscache_why_object_killed why)
-{
- if (test_and_set_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->flags)) {
- pr_err("Error: Object already killed by cache [%s]\n",
- object->cache->identifier);
- return;
- }
-
- switch (why) {
- case FSCACHE_OBJECT_NO_SPACE:
- fscache_stat(&fscache_n_cache_no_space_reject);
- break;
- case FSCACHE_OBJECT_IS_STALE:
- fscache_stat(&fscache_n_cache_stale_objects);
- break;
- case FSCACHE_OBJECT_WAS_RETIRED:
- fscache_stat(&fscache_n_cache_retired_objects);
- break;
- case FSCACHE_OBJECT_WAS_CULLED:
- fscache_stat(&fscache_n_cache_culled_objects);
- break;
- }
-}
-EXPORT_SYMBOL(fscache_object_mark_killed);
-
-/*
- * The object is dead. We can get here if an object gets queued by an event
- * that would lead to its death (such as EV_KILL) when the dispatcher is
- * already running (and so can be requeued) but hasn't yet cleared the event
- * mask.
- */
-static const struct fscache_state *fscache_object_dead(struct fscache_object *object,
- int event)
-{
- if (!test_and_set_bit(FSCACHE_OBJECT_RUN_AFTER_DEAD,
- &object->flags))
- return NO_TRANSIT;
-
- WARN(true, "FS-Cache object redispatched after death");
- return NO_TRANSIT;
-}
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
deleted file mode 100644
index e002cdfaf3cc..000000000000
--- a/fs/fscache/operation.c
+++ /dev/null
@@ -1,633 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache worker operation management routines
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * See Documentation/filesystems/caching/operations.rst
- */
-
-#define FSCACHE_DEBUG_LEVEL OPERATION
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-atomic_t fscache_op_debug_id;
-EXPORT_SYMBOL(fscache_op_debug_id);
-
-static void fscache_operation_dummy_cancel(struct fscache_operation *op)
-{
-}
-
-/**
- * fscache_operation_init - Do basic initialisation of an operation
- * @cookie: The cookie to operate on
- * @op: The operation to initialise
- * @processor: The function to perform the operation
- * @cancel: A function to handle operation cancellation
- * @release: The release function to assign
- *
- * Do basic initialisation of an operation. The caller must still set flags,
- * object and processor if needed.
- */
-void fscache_operation_init(struct fscache_cookie *cookie,
- struct fscache_operation *op,
- fscache_operation_processor_t processor,
- fscache_operation_cancel_t cancel,
- fscache_operation_release_t release)
-{
- INIT_WORK(&op->work, fscache_op_work_func);
- atomic_set(&op->usage, 1);
- op->state = FSCACHE_OP_ST_INITIALISED;
- op->debug_id = atomic_inc_return(&fscache_op_debug_id);
- op->processor = processor;
- op->cancel = cancel ?: fscache_operation_dummy_cancel;
- op->release = release;
- INIT_LIST_HEAD(&op->pend_link);
- fscache_stat(&fscache_n_op_initialised);
- trace_fscache_op(cookie, op, fscache_op_init);
-}
-EXPORT_SYMBOL(fscache_operation_init);
-
-/**
- * fscache_enqueue_operation - Enqueue an operation for processing
- * @op: The operation to enqueue
- *
- * Enqueue an operation for processing by the FS-Cache thread pool.
- *
- * This will get its own ref on the object.
- */
-void fscache_enqueue_operation(struct fscache_operation *op)
-{
- struct fscache_cookie *cookie = op->object->cookie;
-
- _enter("{OBJ%x OP%x,%u}",
- op->object->debug_id, op->debug_id, atomic_read(&op->usage));
-
- ASSERT(list_empty(&op->pend_link));
- ASSERT(op->processor != NULL);
- ASSERT(fscache_object_is_available(op->object));
- ASSERTCMP(atomic_read(&op->usage), >, 0);
- ASSERTIFCMP(op->state != FSCACHE_OP_ST_IN_PROGRESS,
- op->state, ==, FSCACHE_OP_ST_CANCELLED);
-
- fscache_stat(&fscache_n_op_enqueue);
- switch (op->flags & FSCACHE_OP_TYPE) {
- case FSCACHE_OP_ASYNC:
- trace_fscache_op(cookie, op, fscache_op_enqueue_async);
- _debug("queue async");
- atomic_inc(&op->usage);
- if (!queue_work(fscache_op_wq, &op->work))
- fscache_put_operation(op);
- break;
- case FSCACHE_OP_MYTHREAD:
- trace_fscache_op(cookie, op, fscache_op_enqueue_mythread);
- _debug("queue for caller's attention");
- break;
- default:
- pr_err("Unexpected op type %lx", op->flags);
- BUG();
- break;
- }
-}
-EXPORT_SYMBOL(fscache_enqueue_operation);
-
-/*
- * start an op running
- */
-static void fscache_run_op(struct fscache_object *object,
- struct fscache_operation *op)
-{
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
-
- op->state = FSCACHE_OP_ST_IN_PROGRESS;
- object->n_in_progress++;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- if (op->processor)
- fscache_enqueue_operation(op);
- else
- trace_fscache_op(object->cookie, op, fscache_op_run);
- fscache_stat(&fscache_n_op_run);
-}
-
-/*
- * report an unexpected submission
- */
-static void fscache_report_unexpected_submission(struct fscache_object *object,
- struct fscache_operation *op,
- const struct fscache_state *ostate)
-{
- static bool once_only;
- struct fscache_operation *p;
- unsigned n;
-
- if (once_only)
- return;
- once_only = true;
-
- kdebug("unexpected submission OP%x [OBJ%x %s]",
- op->debug_id, object->debug_id, object->state->name);
- kdebug("objstate=%s [%s]", object->state->name, ostate->name);
- kdebug("objflags=%lx", object->flags);
- kdebug("objevent=%lx [%lx]", object->events, object->event_mask);
- kdebug("ops=%u inp=%u exc=%u",
- object->n_ops, object->n_in_progress, object->n_exclusive);
-
- if (!list_empty(&object->pending_ops)) {
- n = 0;
- list_for_each_entry(p, &object->pending_ops, pend_link) {
- ASSERTCMP(p->object, ==, object);
- kdebug("%p %p", op->processor, op->release);
- n++;
- }
-
- kdebug("n=%u", n);
- }
-
- dump_stack();
-}
-
-/*
- * submit an exclusive operation for an object
- * - other ops are excluded from running simultaneously with this one
- * - this gets any extra refs it needs on an op
- */
-int fscache_submit_exclusive_op(struct fscache_object *object,
- struct fscache_operation *op)
-{
- const struct fscache_state *ostate;
- unsigned long flags;
- int ret;
-
- _enter("{OBJ%x OP%x},", object->debug_id, op->debug_id);
-
- trace_fscache_op(object->cookie, op, fscache_op_submit_ex);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- spin_lock(&object->lock);
- ASSERTCMP(object->n_ops, >=, object->n_in_progress);
- ASSERTCMP(object->n_ops, >=, object->n_exclusive);
- ASSERT(list_empty(&op->pend_link));
-
- ostate = object->state;
- smp_rmb();
-
- op->state = FSCACHE_OP_ST_PENDING;
- flags = READ_ONCE(object->flags);
- if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) {
- fscache_stat(&fscache_n_op_rejected);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else if (unlikely(fscache_cache_is_broken(object))) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -EIO;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) {
- op->object = object;
- object->n_ops++;
- object->n_exclusive++; /* reads and writes must wait */
-
- if (object->n_in_progress > 0) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- } else if (!list_empty(&object->pending_ops)) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- fscache_start_operations(object);
- } else {
- ASSERTCMP(object->n_in_progress, ==, 0);
- fscache_run_op(object, op);
- }
-
- /* need to issue a new write op after this */
- clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) {
- op->object = object;
- object->n_ops++;
- object->n_exclusive++; /* reads and writes must wait */
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else {
- fscache_report_unexpected_submission(object, op, ostate);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- }
-
- spin_unlock(&object->lock);
- return ret;
-}
-
-/*
- * submit an operation for an object
- * - objects may be submitted only in the following states:
- * - during object creation (write ops may be submitted)
- * - whilst the object is active
- * - after an I/O error incurred in one of the two above states (op rejected)
- * - this gets any extra refs it needs on an op
- */
-int fscache_submit_op(struct fscache_object *object,
- struct fscache_operation *op)
-{
- const struct fscache_state *ostate;
- unsigned long flags;
- int ret;
-
- _enter("{OBJ%x OP%x},{%u}",
- object->debug_id, op->debug_id, atomic_read(&op->usage));
-
- trace_fscache_op(object->cookie, op, fscache_op_submit);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- spin_lock(&object->lock);
- ASSERTCMP(object->n_ops, >=, object->n_in_progress);
- ASSERTCMP(object->n_ops, >=, object->n_exclusive);
- ASSERT(list_empty(&op->pend_link));
-
- ostate = object->state;
- smp_rmb();
-
- op->state = FSCACHE_OP_ST_PENDING;
- flags = READ_ONCE(object->flags);
- if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) {
- fscache_stat(&fscache_n_op_rejected);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else if (unlikely(fscache_cache_is_broken(object))) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -EIO;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) {
- op->object = object;
- object->n_ops++;
-
- if (object->n_exclusive > 0) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- } else if (!list_empty(&object->pending_ops)) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- fscache_start_operations(object);
- } else {
- ASSERTCMP(object->n_exclusive, ==, 0);
- fscache_run_op(object, op);
- }
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) {
- op->object = object;
- object->n_ops++;
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else {
- fscache_report_unexpected_submission(object, op, ostate);
- ASSERT(!fscache_object_is_active(object));
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- }
-
- spin_unlock(&object->lock);
- return ret;
-}
-
-/*
- * queue an object for withdrawal on error, aborting all following asynchronous
- * operations
- */
-void fscache_abort_object(struct fscache_object *object)
-{
- _enter("{OBJ%x}", object->debug_id);
-
- fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR);
-}
-
-/*
- * Jump start the operation processing on an object. The caller must hold
- * object->lock.
- */
-void fscache_start_operations(struct fscache_object *object)
-{
- struct fscache_operation *op;
- bool stop = false;
-
- while (!list_empty(&object->pending_ops) && !stop) {
- op = list_entry(object->pending_ops.next,
- struct fscache_operation, pend_link);
-
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) {
- if (object->n_in_progress > 0)
- break;
- stop = true;
- }
- list_del_init(&op->pend_link);
- fscache_run_op(object, op);
-
- /* the pending queue was holding a ref on the object */
- fscache_put_operation(op);
- }
-
- ASSERTCMP(object->n_in_progress, <=, object->n_ops);
-
- _debug("woke %d ops on OBJ%x",
- object->n_in_progress, object->debug_id);
-}
-
-/*
- * cancel an operation that's pending on an object
- */
-int fscache_cancel_op(struct fscache_operation *op,
- bool cancel_in_progress_op)
-{
- struct fscache_object *object = op->object;
- bool put = false;
- int ret;
-
- _enter("OBJ%x OP%x}", op->object->debug_id, op->debug_id);
-
- trace_fscache_op(object->cookie, op, fscache_op_cancel);
-
- ASSERTCMP(op->state, >=, FSCACHE_OP_ST_PENDING);
- ASSERTCMP(op->state, !=, FSCACHE_OP_ST_CANCELLED);
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- spin_lock(&object->lock);
-
- ret = -EBUSY;
- if (op->state == FSCACHE_OP_ST_PENDING) {
- ASSERT(!list_empty(&op->pend_link));
- list_del_init(&op->pend_link);
- put = true;
-
- fscache_stat(&fscache_n_op_cancelled);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- ret = 0;
- } else if (op->state == FSCACHE_OP_ST_IN_PROGRESS && cancel_in_progress_op) {
- ASSERTCMP(object->n_in_progress, >, 0);
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- object->n_in_progress--;
- if (object->n_in_progress == 0)
- fscache_start_operations(object);
-
- fscache_stat(&fscache_n_op_cancelled);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- ret = 0;
- }
-
- if (put)
- fscache_put_operation(op);
- spin_unlock(&object->lock);
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * Cancel all pending operations on an object
- */
-void fscache_cancel_all_ops(struct fscache_object *object)
-{
- struct fscache_operation *op;
-
- _enter("OBJ%x", object->debug_id);
-
- spin_lock(&object->lock);
-
- while (!list_empty(&object->pending_ops)) {
- op = list_entry(object->pending_ops.next,
- struct fscache_operation, pend_link);
- fscache_stat(&fscache_n_op_cancelled);
- list_del_init(&op->pend_link);
-
- trace_fscache_op(object->cookie, op, fscache_op_cancel_all);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
-
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- fscache_put_operation(op);
- cond_resched_lock(&object->lock);
- }
-
- spin_unlock(&object->lock);
- _leave("");
-}
-
-/*
- * Record the completion or cancellation of an in-progress operation.
- */
-void fscache_op_complete(struct fscache_operation *op, bool cancelled)
-{
- struct fscache_object *object = op->object;
-
- _enter("OBJ%x", object->debug_id);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS);
- ASSERTCMP(object->n_in_progress, >, 0);
- ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags),
- object->n_exclusive, >, 0);
- ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags),
- object->n_in_progress, ==, 1);
-
- spin_lock(&object->lock);
-
- if (!cancelled) {
- trace_fscache_op(object->cookie, op, fscache_op_completed);
- op->state = FSCACHE_OP_ST_COMPLETE;
- } else {
- op->cancel(op);
- trace_fscache_op(object->cookie, op, fscache_op_cancelled);
- op->state = FSCACHE_OP_ST_CANCELLED;
- }
-
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- object->n_in_progress--;
- if (object->n_in_progress == 0)
- fscache_start_operations(object);
-
- spin_unlock(&object->lock);
- _leave("");
-}
-EXPORT_SYMBOL(fscache_op_complete);
-
-/*
- * release an operation
- * - queues pending ops if this is the last in-progress op
- */
-void fscache_put_operation(struct fscache_operation *op)
-{
- struct fscache_object *object;
- struct fscache_cache *cache;
-
- _enter("{OBJ%x OP%x,%d}",
- op->object ? op->object->debug_id : 0,
- op->debug_id, atomic_read(&op->usage));
-
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- if (!atomic_dec_and_test(&op->usage))
- return;
-
- trace_fscache_op(op->object ? op->object->cookie : NULL, op, fscache_op_put);
-
- _debug("PUT OP");
- ASSERTIFCMP(op->state != FSCACHE_OP_ST_INITIALISED &&
- op->state != FSCACHE_OP_ST_COMPLETE,
- op->state, ==, FSCACHE_OP_ST_CANCELLED);
-
- fscache_stat(&fscache_n_op_release);
-
- if (op->release) {
- op->release(op);
- op->release = NULL;
- }
- op->state = FSCACHE_OP_ST_DEAD;
-
- object = op->object;
- if (likely(object)) {
- if (test_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags))
- atomic_dec(&object->n_reads);
- if (test_bit(FSCACHE_OP_UNUSE_COOKIE, &op->flags))
- fscache_unuse_cookie(object);
-
- /* now... we may get called with the object spinlock held, so we
- * complete the cleanup here only if we can immediately acquire the
- * lock, and defer it otherwise */
- if (!spin_trylock(&object->lock)) {
- _debug("defer put");
- fscache_stat(&fscache_n_op_deferred_release);
-
- cache = object->cache;
- spin_lock(&cache->op_gc_list_lock);
- list_add_tail(&op->pend_link, &cache->op_gc_list);
- spin_unlock(&cache->op_gc_list_lock);
- schedule_work(&cache->op_gc);
- _leave(" [defer]");
- return;
- }
-
- ASSERTCMP(object->n_ops, >, 0);
- object->n_ops--;
- if (object->n_ops == 0)
- fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED);
-
- spin_unlock(&object->lock);
- }
-
- kfree(op);
- _leave(" [done]");
-}
-EXPORT_SYMBOL(fscache_put_operation);
-
-/*
- * garbage collect operations that have had their release deferred
- */
-void fscache_operation_gc(struct work_struct *work)
-{
- struct fscache_operation *op;
- struct fscache_object *object;
- struct fscache_cache *cache =
- container_of(work, struct fscache_cache, op_gc);
- int count = 0;
-
- _enter("");
-
- do {
- spin_lock(&cache->op_gc_list_lock);
- if (list_empty(&cache->op_gc_list)) {
- spin_unlock(&cache->op_gc_list_lock);
- break;
- }
-
- op = list_entry(cache->op_gc_list.next,
- struct fscache_operation, pend_link);
- list_del(&op->pend_link);
- spin_unlock(&cache->op_gc_list_lock);
-
- object = op->object;
- trace_fscache_op(object->cookie, op, fscache_op_gc);
-
- spin_lock(&object->lock);
-
- _debug("GC DEFERRED REL OBJ%x OP%x",
- object->debug_id, op->debug_id);
- fscache_stat(&fscache_n_op_gc);
-
- ASSERTCMP(atomic_read(&op->usage), ==, 0);
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_DEAD);
-
- ASSERTCMP(object->n_ops, >, 0);
- object->n_ops--;
- if (object->n_ops == 0)
- fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED);
-
- spin_unlock(&object->lock);
- kfree(op);
-
- } while (count++ < 20);
-
- if (!list_empty(&cache->op_gc_list))
- schedule_work(&cache->op_gc);
-
- _leave("");
-}
-
-/*
- * execute an operation using fs_op_wq to provide processing context -
- * the caller holds a ref to this object, so we don't need to hold one
- */
-void fscache_op_work_func(struct work_struct *work)
-{
- struct fscache_operation *op =
- container_of(work, struct fscache_operation, work);
-
- _enter("{OBJ%x OP%x,%d}",
- op->object->debug_id, op->debug_id, atomic_read(&op->usage));
-
- trace_fscache_op(op->object->cookie, op, fscache_op_work);
-
- ASSERT(op->processor != NULL);
- op->processor(op);
- fscache_put_operation(op);
-
- _leave("");
-}
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
deleted file mode 100644
index 3fd6a2b45fed..000000000000
--- a/fs/fscache/page.c
+++ /dev/null
@@ -1,176 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Cache page management and data I/O routines
- *
- * Copyright (C) 2004-2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL PAGE
-#include <linux/module.h>
-#include <linux/fscache-cache.h>
-#include <linux/buffer_head.h>
-#include <linux/pagevec.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-/*
- * actually apply the changed attributes to a cache object
- */
-static void fscache_attr_changed_op(struct fscache_operation *op)
-{
- struct fscache_object *object = op->object;
- int ret;
-
- _enter("{OBJ%x OP%x}", object->debug_id, op->debug_id);
-
- fscache_stat(&fscache_n_attr_changed_calls);
-
- if (fscache_object_is_active(object)) {
- fscache_stat(&fscache_n_cop_attr_changed);
- ret = object->cache->ops->attr_changed(object);
- fscache_stat_d(&fscache_n_cop_attr_changed);
- if (ret < 0)
- fscache_abort_object(object);
- fscache_op_complete(op, ret < 0);
- } else {
- fscache_op_complete(op, true);
- }
-
- _leave("");
-}
-
-/*
- * notification that the attributes on an object have changed
- */
-int __fscache_attr_changed(struct fscache_cookie *cookie)
-{
- struct fscache_operation *op;
- struct fscache_object *object;
- bool wake_cookie = false;
-
- _enter("%p", cookie);
-
- ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX);
-
- fscache_stat(&fscache_n_attr_changed);
-
- op = kzalloc(sizeof(*op), GFP_KERNEL);
- if (!op) {
- fscache_stat(&fscache_n_attr_changed_nomem);
- _leave(" = -ENOMEM");
- return -ENOMEM;
- }
-
- fscache_operation_init(cookie, op, fscache_attr_changed_op, NULL, NULL);
- trace_fscache_page_op(cookie, NULL, op, fscache_page_op_attr_changed);
- op->flags = FSCACHE_OP_ASYNC |
- (1 << FSCACHE_OP_EXCLUSIVE) |
- (1 << FSCACHE_OP_UNUSE_COOKIE);
-
- spin_lock(&cookie->lock);
-
- if (!fscache_cookie_enabled(cookie) ||
- hlist_empty(&cookie->backing_objects))
- goto nobufs;
- object = hlist_entry(cookie->backing_objects.first,
- struct fscache_object, cookie_link);
-
- __fscache_use_cookie(cookie);
- if (fscache_submit_exclusive_op(object, op) < 0)
- goto nobufs_dec;
- spin_unlock(&cookie->lock);
- fscache_stat(&fscache_n_attr_changed_ok);
- fscache_put_operation(op);
- _leave(" = 0");
- return 0;
-
-nobufs_dec:
- wake_cookie = __fscache_unuse_cookie(cookie);
-nobufs:
- spin_unlock(&cookie->lock);
- fscache_put_operation(op);
- if (wake_cookie)
- __fscache_wake_unused_cookie(cookie);
- fscache_stat(&fscache_n_attr_changed_nobufs);
- _leave(" = %d", -ENOBUFS);
- return -ENOBUFS;
-}
-EXPORT_SYMBOL(__fscache_attr_changed);
-
-/*
- * wait for a deferred lookup to complete
- */
-int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
-{
- _enter("");
-
- if (!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags)) {
- _leave(" = 0 [imm]");
- return 0;
- }
-
- fscache_stat(&fscache_n_retrievals_wait);
-
- if (wait_on_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP,
- TASK_INTERRUPTIBLE) != 0) {
- fscache_stat(&fscache_n_retrievals_intr);
- _leave(" = -ERESTARTSYS");
- return -ERESTARTSYS;
- }
-
- ASSERT(!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags));
-
- smp_rmb();
- _leave(" = 0 [dly]");
- return 0;
-}
-
-/*
- * wait for an object to become active (or dead)
- */
-int fscache_wait_for_operation_activation(struct fscache_object *object,
- struct fscache_operation *op,
- atomic_t *stat_op_waits,
- atomic_t *stat_object_dead)
-{
- int ret;
-
- if (!test_bit(FSCACHE_OP_WAITING, &op->flags))
- goto check_if_dead;
-
- _debug(">>> WT");
- if (stat_op_waits)
- fscache_stat(stat_op_waits);
- if (wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
- TASK_INTERRUPTIBLE) != 0) {
- trace_fscache_op(object->cookie, op, fscache_op_signal);
- ret = fscache_cancel_op(op, false);
- if (ret == 0)
- return -ERESTARTSYS;
-
- /* it's been removed from the pending queue by another party,
- * so we should get to run shortly */
- wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
- TASK_UNINTERRUPTIBLE);
- }
- _debug("<<< GO");
-
-check_if_dead:
- if (op->state == FSCACHE_OP_ST_CANCELLED) {
- if (stat_object_dead)
- fscache_stat(stat_object_dead);
- _leave(" = -ENOBUFS [cancelled]");
- return -ENOBUFS;
- }
- if (unlikely(fscache_object_is_dying(object) ||
- fscache_cache_is_broken(object))) {
- enum fscache_operation_state state = op->state;
- trace_fscache_op(object->cookie, op, fscache_op_signal);
- fscache_cancel_op(op, true);
- if (stat_object_dead)
- fscache_stat(stat_object_dead);
- _leave(" = -ENOBUFS [obj dead %d]", state);
- return -ENOBUFS;
- }
- return 0;
-}
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
deleted file mode 100644
index 061df8f61ffc..000000000000
--- a/fs/fscache/proc.c
+++ /dev/null
@@ -1,71 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache statistics viewing interface
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL OPERATION
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include "internal.h"
-
-/*
- * initialise the /proc/fs/fscache/ directory
- */
-int __init fscache_proc_init(void)
-{
- _enter("");
-
- if (!proc_mkdir("fs/fscache", NULL))
- goto error_dir;
-
- if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
- &fscache_cookies_seq_ops))
- goto error_cookies;
-
-#ifdef CONFIG_FSCACHE_STATS
- if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
- fscache_stats_show))
- goto error_stats;
-#endif
-
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
- if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
- &fscache_objlist_proc_ops))
- goto error_objects;
-#endif
-
- _leave(" = 0");
- return 0;
-
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
-error_objects:
-#endif
-#ifdef CONFIG_FSCACHE_STATS
- remove_proc_entry("fs/fscache/stats", NULL);
-error_stats:
-#endif
- remove_proc_entry("fs/fscache/cookies", NULL);
-error_cookies:
- remove_proc_entry("fs/fscache", NULL);
-error_dir:
- _leave(" = -ENOMEM");
- return -ENOMEM;
-}
-
-/*
- * clean up the /proc/fs/fscache/ directory
- */
-void fscache_proc_cleanup(void)
-{
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
- remove_proc_entry("fs/fscache/objects", NULL);
-#endif
-#ifdef CONFIG_FSCACHE_STATS
- remove_proc_entry("fs/fscache/stats", NULL);
-#endif
- remove_proc_entry("fs/fscache/cookies", NULL);
- remove_proc_entry("fs/fscache", NULL);
-}
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
deleted file mode 100644
index 2449aa459140..000000000000
--- a/fs/fscache/stats.c
+++ /dev/null
@@ -1,226 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache statistics
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL THREAD
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include "internal.h"
-
-/*
- * operation counters
- */
-atomic_t fscache_n_op_pend;
-atomic_t fscache_n_op_run;
-atomic_t fscache_n_op_enqueue;
-atomic_t fscache_n_op_deferred_release;
-atomic_t fscache_n_op_initialised;
-atomic_t fscache_n_op_release;
-atomic_t fscache_n_op_gc;
-atomic_t fscache_n_op_cancelled;
-atomic_t fscache_n_op_rejected;
-
-atomic_t fscache_n_attr_changed;
-atomic_t fscache_n_attr_changed_ok;
-atomic_t fscache_n_attr_changed_nobufs;
-atomic_t fscache_n_attr_changed_nomem;
-atomic_t fscache_n_attr_changed_calls;
-
-atomic_t fscache_n_retrievals;
-atomic_t fscache_n_retrievals_ok;
-atomic_t fscache_n_retrievals_wait;
-atomic_t fscache_n_retrievals_nodata;
-atomic_t fscache_n_retrievals_nobufs;
-atomic_t fscache_n_retrievals_intr;
-atomic_t fscache_n_retrievals_nomem;
-atomic_t fscache_n_retrievals_object_dead;
-atomic_t fscache_n_retrieval_ops;
-atomic_t fscache_n_retrieval_op_waits;
-
-atomic_t fscache_n_stores;
-atomic_t fscache_n_stores_ok;
-atomic_t fscache_n_stores_again;
-atomic_t fscache_n_stores_nobufs;
-atomic_t fscache_n_stores_intr;
-atomic_t fscache_n_stores_oom;
-atomic_t fscache_n_store_ops;
-atomic_t fscache_n_stores_object_dead;
-atomic_t fscache_n_store_op_waits;
-
-atomic_t fscache_n_acquires;
-atomic_t fscache_n_acquires_null;
-atomic_t fscache_n_acquires_no_cache;
-atomic_t fscache_n_acquires_ok;
-atomic_t fscache_n_acquires_nobufs;
-atomic_t fscache_n_acquires_oom;
-
-atomic_t fscache_n_invalidates;
-atomic_t fscache_n_invalidates_run;
-
-atomic_t fscache_n_updates;
-atomic_t fscache_n_updates_null;
-atomic_t fscache_n_updates_run;
-
-atomic_t fscache_n_relinquishes;
-atomic_t fscache_n_relinquishes_null;
-atomic_t fscache_n_relinquishes_waitcrt;
-atomic_t fscache_n_relinquishes_retire;
-
-atomic_t fscache_n_cookie_index;
-atomic_t fscache_n_cookie_data;
-atomic_t fscache_n_cookie_special;
-
-atomic_t fscache_n_object_alloc;
-atomic_t fscache_n_object_no_alloc;
-atomic_t fscache_n_object_lookups;
-atomic_t fscache_n_object_lookups_negative;
-atomic_t fscache_n_object_lookups_positive;
-atomic_t fscache_n_object_lookups_timed_out;
-atomic_t fscache_n_object_created;
-atomic_t fscache_n_object_avail;
-atomic_t fscache_n_object_dead;
-
-atomic_t fscache_n_checkaux_none;
-atomic_t fscache_n_checkaux_okay;
-atomic_t fscache_n_checkaux_update;
-atomic_t fscache_n_checkaux_obsolete;
-
-atomic_t fscache_n_cop_alloc_object;
-atomic_t fscache_n_cop_lookup_object;
-atomic_t fscache_n_cop_lookup_complete;
-atomic_t fscache_n_cop_grab_object;
-atomic_t fscache_n_cop_invalidate_object;
-atomic_t fscache_n_cop_update_object;
-atomic_t fscache_n_cop_drop_object;
-atomic_t fscache_n_cop_put_object;
-atomic_t fscache_n_cop_sync_cache;
-atomic_t fscache_n_cop_attr_changed;
-
-atomic_t fscache_n_cache_no_space_reject;
-atomic_t fscache_n_cache_stale_objects;
-atomic_t fscache_n_cache_retired_objects;
-atomic_t fscache_n_cache_culled_objects;
-
-/*
- * display the general statistics
- */
-int fscache_stats_show(struct seq_file *m, void *v)
-{
- seq_puts(m, "FS-Cache statistics\n");
-
- seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n",
- atomic_read(&fscache_n_cookie_index),
- atomic_read(&fscache_n_cookie_data),
- atomic_read(&fscache_n_cookie_special));
-
- seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u\n",
- atomic_read(&fscache_n_object_alloc),
- atomic_read(&fscache_n_object_no_alloc),
- atomic_read(&fscache_n_object_avail),
- atomic_read(&fscache_n_object_dead));
- seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u\n",
- atomic_read(&fscache_n_checkaux_none),
- atomic_read(&fscache_n_checkaux_okay),
- atomic_read(&fscache_n_checkaux_update),
- atomic_read(&fscache_n_checkaux_obsolete));
-
- seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u"
- " oom=%u\n",
- atomic_read(&fscache_n_acquires),
- atomic_read(&fscache_n_acquires_null),
- atomic_read(&fscache_n_acquires_no_cache),
- atomic_read(&fscache_n_acquires_ok),
- atomic_read(&fscache_n_acquires_nobufs),
- atomic_read(&fscache_n_acquires_oom));
-
- seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u tmo=%u\n",
- atomic_read(&fscache_n_object_lookups),
- atomic_read(&fscache_n_object_lookups_negative),
- atomic_read(&fscache_n_object_lookups_positive),
- atomic_read(&fscache_n_object_created),
- atomic_read(&fscache_n_object_lookups_timed_out));
-
- seq_printf(m, "Invals : n=%u run=%u\n",
- atomic_read(&fscache_n_invalidates),
- atomic_read(&fscache_n_invalidates_run));
-
- seq_printf(m, "Updates: n=%u nul=%u run=%u\n",
- atomic_read(&fscache_n_updates),
- atomic_read(&fscache_n_updates_null),
- atomic_read(&fscache_n_updates_run));
-
- seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u rtr=%u\n",
- atomic_read(&fscache_n_relinquishes),
- atomic_read(&fscache_n_relinquishes_null),
- atomic_read(&fscache_n_relinquishes_waitcrt),
- atomic_read(&fscache_n_relinquishes_retire));
-
- seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u\n",
- atomic_read(&fscache_n_attr_changed),
- atomic_read(&fscache_n_attr_changed_ok),
- atomic_read(&fscache_n_attr_changed_nobufs),
- atomic_read(&fscache_n_attr_changed_nomem),
- atomic_read(&fscache_n_attr_changed_calls));
-
- seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
- " int=%u oom=%u\n",
- atomic_read(&fscache_n_retrievals),
- atomic_read(&fscache_n_retrievals_ok),
- atomic_read(&fscache_n_retrievals_wait),
- atomic_read(&fscache_n_retrievals_nodata),
- atomic_read(&fscache_n_retrievals_nobufs),
- atomic_read(&fscache_n_retrievals_intr),
- atomic_read(&fscache_n_retrievals_nomem));
- seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u\n",
- atomic_read(&fscache_n_retrieval_ops),
- atomic_read(&fscache_n_retrieval_op_waits),
- atomic_read(&fscache_n_retrievals_object_dead));
-
- seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u int=%u oom=%u\n",
- atomic_read(&fscache_n_stores),
- atomic_read(&fscache_n_stores_ok),
- atomic_read(&fscache_n_stores_again),
- atomic_read(&fscache_n_stores_nobufs),
- atomic_read(&fscache_n_stores_intr),
- atomic_read(&fscache_n_stores_oom));
- seq_printf(m, "Stores : ops=%u owt=%u abt=%u\n",
- atomic_read(&fscache_n_store_ops),
- atomic_read(&fscache_n_store_op_waits),
- atomic_read(&fscache_n_stores_object_dead));
-
- seq_printf(m, "Ops : pend=%u run=%u enq=%u can=%u rej=%u\n",
- atomic_read(&fscache_n_op_pend),
- atomic_read(&fscache_n_op_run),
- atomic_read(&fscache_n_op_enqueue),
- atomic_read(&fscache_n_op_cancelled),
- atomic_read(&fscache_n_op_rejected));
- seq_printf(m, "Ops : ini=%u dfr=%u rel=%u gc=%u\n",
- atomic_read(&fscache_n_op_initialised),
- atomic_read(&fscache_n_op_deferred_release),
- atomic_read(&fscache_n_op_release),
- atomic_read(&fscache_n_op_gc));
-
- seq_printf(m, "CacheOp: alo=%d luo=%d luc=%d gro=%d\n",
- atomic_read(&fscache_n_cop_alloc_object),
- atomic_read(&fscache_n_cop_lookup_object),
- atomic_read(&fscache_n_cop_lookup_complete),
- atomic_read(&fscache_n_cop_grab_object));
- seq_printf(m, "CacheOp: inv=%d upo=%d dro=%d pto=%d atc=%d syn=%d\n",
- atomic_read(&fscache_n_cop_invalidate_object),
- atomic_read(&fscache_n_cop_update_object),
- atomic_read(&fscache_n_cop_drop_object),
- atomic_read(&fscache_n_cop_put_object),
- atomic_read(&fscache_n_cop_attr_changed),
- atomic_read(&fscache_n_cop_sync_cache));
- seq_printf(m, "CacheEv: nsp=%d stl=%d rtr=%d cul=%d\n",
- atomic_read(&fscache_n_cache_no_space_reject),
- atomic_read(&fscache_n_cache_stale_objects),
- atomic_read(&fscache_n_cache_retired_objects),
- atomic_read(&fscache_n_cache_culled_objects));
- netfs_stats_show(m);
- return 0;
-}
diff --git a/fs/fscache_old/Kconfig b/fs/fscache_old/Kconfig
new file mode 100644
index 000000000000..b313a978ae0a
--- /dev/null
+++ b/fs/fscache_old/Kconfig
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config FSCACHE
+ tristate "General filesystem local caching manager"
+ select NETFS_SUPPORT
+ help
+ This option enables a generic filesystem caching manager that can be
+ used by various network and other filesystems to cache data locally.
+ Different sorts of caches can be plugged in, depending on the
+ resources available.
+
+ See Documentation/filesystems/caching/fscache.rst for more information.
+
+config FSCACHE_STATS
+ bool "Gather statistical information on local caching"
+ depends on FSCACHE && PROC_FS
+ select NETFS_STATS
+ help
+ This option causes statistical information to be gathered on local
+ caching and exported through file:
+
+ /proc/fs/fscache/stats
+
+ The gathering of statistics adds a certain amount of overhead to
+ execution as there are a quite a few stats gathered, and on a
+ multi-CPU system these may be on cachelines that keep bouncing
+ between CPUs. On the other hand, the stats are very useful for
+ debugging purposes. Saying 'Y' here is recommended.
+
+ See Documentation/filesystems/caching/fscache.rst for more information.
+
+config FSCACHE_DEBUG
+ bool "Debug FS-Cache"
+ depends on FSCACHE
+ help
+ This permits debugging to be dynamically enabled in the local caching
+ management module. If this is set, the debugging output may be
+ enabled by setting bits in /sys/modules/fscache/parameter/debug.
+
+ See Documentation/filesystems/caching/fscache.rst for more information.
diff --git a/fs/fscache_old/Makefile b/fs/fscache_old/Makefile
new file mode 100644
index 000000000000..03a871d689bb
--- /dev/null
+++ b/fs/fscache_old/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for general filesystem caching code
+#
+
+fscache-y := \
+ cache.o \
+ cookie.o \
+ fsdef.o \
+ io.o \
+ main.o \
+ netfs.o \
+ object.o \
+ operation.o \
+ page.o
+
+fscache-$(CONFIG_PROC_FS) += proc.o
+fscache-$(CONFIG_FSCACHE_STATS) += stats.o
+
+obj-$(CONFIG_FSCACHE) := fscache.o
diff --git a/fs/fscache_old/cache.c b/fs/fscache_old/cache.c
new file mode 100644
index 000000000000..cfa60c2faf68
--- /dev/null
+++ b/fs/fscache_old/cache.c
@@ -0,0 +1,410 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache cache handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+LIST_HEAD(fscache_cache_list);
+DECLARE_RWSEM(fscache_addremove_sem);
+DECLARE_WAIT_QUEUE_HEAD(fscache_cache_cleared_wq);
+EXPORT_SYMBOL(fscache_cache_cleared_wq);
+
+static LIST_HEAD(fscache_cache_tag_list);
+
+/*
+ * look up a cache tag
+ */
+struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *name)
+{
+ struct fscache_cache_tag *tag, *xtag;
+
+ /* firstly check for the existence of the tag under read lock */
+ down_read(&fscache_addremove_sem);
+
+ list_for_each_entry(tag, &fscache_cache_tag_list, link) {
+ if (strcmp(tag->name, name) == 0) {
+ atomic_inc(&tag->usage);
+ up_read(&fscache_addremove_sem);
+ return tag;
+ }
+ }
+
+ up_read(&fscache_addremove_sem);
+
+ /* the tag does not exist - create a candidate */
+ xtag = kzalloc(sizeof(*xtag) + strlen(name) + 1, GFP_KERNEL);
+ if (!xtag)
+ /* return a dummy tag if out of memory */
+ return ERR_PTR(-ENOMEM);
+
+ atomic_set(&xtag->usage, 1);
+ strcpy(xtag->name, name);
+
+ /* write lock, search again and add if still not present */
+ down_write(&fscache_addremove_sem);
+
+ list_for_each_entry(tag, &fscache_cache_tag_list, link) {
+ if (strcmp(tag->name, name) == 0) {
+ atomic_inc(&tag->usage);
+ up_write(&fscache_addremove_sem);
+ kfree(xtag);
+ return tag;
+ }
+ }
+
+ list_add_tail(&xtag->link, &fscache_cache_tag_list);
+ up_write(&fscache_addremove_sem);
+ return xtag;
+}
+
+/*
+ * release a reference to a cache tag
+ */
+void __fscache_release_cache_tag(struct fscache_cache_tag *tag)
+{
+ if (tag != ERR_PTR(-ENOMEM)) {
+ down_write(&fscache_addremove_sem);
+
+ if (atomic_dec_and_test(&tag->usage))
+ list_del_init(&tag->link);
+ else
+ tag = NULL;
+
+ up_write(&fscache_addremove_sem);
+
+ kfree(tag);
+ }
+}
+
+/*
+ * select a cache in which to store an object
+ * - the cache addremove semaphore must be at least read-locked by the caller
+ * - the object will never be an index
+ */
+struct fscache_cache *fscache_select_cache_for_object(
+ struct fscache_cookie *cookie)
+{
+ struct fscache_cache_tag *tag;
+ struct fscache_object *object;
+ struct fscache_cache *cache;
+
+ _enter("");
+
+ if (list_empty(&fscache_cache_list)) {
+ _leave(" = NULL [no cache]");
+ return NULL;
+ }
+
+ /* we check the parent to determine the cache to use */
+ spin_lock(&cookie->lock);
+
+ /* the first in the parent's backing list should be the preferred
+ * cache */
+ if (!hlist_empty(&cookie->backing_objects)) {
+ object = hlist_entry(cookie->backing_objects.first,
+ struct fscache_object, cookie_link);
+
+ cache = object->cache;
+ if (fscache_object_is_dying(object) ||
+ test_bit(FSCACHE_IOERROR, &cache->flags))
+ cache = NULL;
+
+ spin_unlock(&cookie->lock);
+ _leave(" = %s [parent]", cache ? cache->tag->name : "NULL");
+ return cache;
+ }
+
+ /* the parent is unbacked */
+ if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ /* cookie not an index and is unbacked */
+ spin_unlock(&cookie->lock);
+ _leave(" = NULL [cookie ub,ni]");
+ return NULL;
+ }
+
+ spin_unlock(&cookie->lock);
+
+ if (!cookie->def->select_cache)
+ goto no_preference;
+
+ /* ask the netfs for its preference */
+ tag = cookie->def->select_cache(cookie->parent->netfs_data,
+ cookie->netfs_data);
+ if (!tag)
+ goto no_preference;
+
+ if (tag == ERR_PTR(-ENOMEM)) {
+ _leave(" = NULL [nomem tag]");
+ return NULL;
+ }
+
+ if (!tag->cache) {
+ _leave(" = NULL [unbacked tag]");
+ return NULL;
+ }
+
+ if (test_bit(FSCACHE_IOERROR, &tag->cache->flags))
+ return NULL;
+
+ _leave(" = %s [specific]", tag->name);
+ return tag->cache;
+
+no_preference:
+ /* netfs has no preference - just select first cache */
+ cache = list_entry(fscache_cache_list.next,
+ struct fscache_cache, link);
+ _leave(" = %s [first]", cache->tag->name);
+ return cache;
+}
+
+/**
+ * fscache_init_cache - Initialise a cache record
+ * @cache: The cache record to be initialised
+ * @ops: The cache operations to be installed in that record
+ * @idfmt: Format string to define identifier
+ * @...: sprintf-style arguments
+ *
+ * Initialise a record of a cache and fill in the name.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+void fscache_init_cache(struct fscache_cache *cache,
+ const struct fscache_cache_ops *ops,
+ const char *idfmt,
+ ...)
+{
+ va_list va;
+
+ memset(cache, 0, sizeof(*cache));
+
+ cache->ops = ops;
+
+ va_start(va, idfmt);
+ vsnprintf(cache->identifier, sizeof(cache->identifier), idfmt, va);
+ va_end(va);
+
+ INIT_WORK(&cache->op_gc, fscache_operation_gc);
+ INIT_LIST_HEAD(&cache->link);
+ INIT_LIST_HEAD(&cache->object_list);
+ INIT_LIST_HEAD(&cache->op_gc_list);
+ spin_lock_init(&cache->object_list_lock);
+ spin_lock_init(&cache->op_gc_list_lock);
+}
+EXPORT_SYMBOL(fscache_init_cache);
+
+/**
+ * fscache_add_cache - Declare a cache as being open for business
+ * @cache: The record describing the cache
+ * @ifsdef: The record of the cache object describing the top-level index
+ * @tagname: The tag describing this cache
+ *
+ * Add a cache to the system, making it available for netfs's to use.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+int fscache_add_cache(struct fscache_cache *cache,
+ struct fscache_object *ifsdef,
+ const char *tagname)
+{
+ struct fscache_cache_tag *tag;
+
+ ASSERTCMP(ifsdef->cookie, ==, &fscache_fsdef_index);
+ BUG_ON(!cache->ops);
+ BUG_ON(!ifsdef);
+
+ cache->flags = 0;
+ ifsdef->event_mask =
+ ((1 << NR_FSCACHE_OBJECT_EVENTS) - 1) &
+ ~(1 << FSCACHE_OBJECT_EV_CLEARED);
+ __set_bit(FSCACHE_OBJECT_IS_AVAILABLE, &ifsdef->flags);
+
+ if (!tagname)
+ tagname = cache->identifier;
+
+ BUG_ON(!tagname[0]);
+
+ _enter("{%s.%s},,%s", cache->ops->name, cache->identifier, tagname);
+
+ /* we use the cache tag to uniquely identify caches */
+ tag = __fscache_lookup_cache_tag(tagname);
+ if (IS_ERR(tag))
+ goto nomem;
+
+ if (test_and_set_bit(FSCACHE_TAG_RESERVED, &tag->flags))
+ goto tag_in_use;
+
+ cache->kobj = kobject_create_and_add(tagname, fscache_root);
+ if (!cache->kobj)
+ goto error;
+
+ ifsdef->cache = cache;
+ cache->fsdef = ifsdef;
+
+ down_write(&fscache_addremove_sem);
+
+ tag->cache = cache;
+ cache->tag = tag;
+
+ /* add the cache to the list */
+ list_add(&cache->link, &fscache_cache_list);
+
+ /* add the cache's netfs definition index object to the cache's
+ * list */
+ spin_lock(&cache->object_list_lock);
+ list_add_tail(&ifsdef->cache_link, &cache->object_list);
+ spin_unlock(&cache->object_list_lock);
+
+ /* add the cache's netfs definition index object to the top level index
+ * cookie as a known backing object */
+ spin_lock(&fscache_fsdef_index.lock);
+
+ hlist_add_head(&ifsdef->cookie_link,
+ &fscache_fsdef_index.backing_objects);
+
+ refcount_inc(&fscache_fsdef_index.ref);
+
+ /* done */
+ spin_unlock(&fscache_fsdef_index.lock);
+ up_write(&fscache_addremove_sem);
+
+ pr_notice("Cache \"%s\" added (type %s)\n",
+ cache->tag->name, cache->ops->name);
+ kobject_uevent(cache->kobj, KOBJ_ADD);
+
+ _leave(" = 0 [%s]", cache->identifier);
+ return 0;
+
+tag_in_use:
+ pr_err("Cache tag '%s' already in use\n", tagname);
+ __fscache_release_cache_tag(tag);
+ _leave(" = -EXIST");
+ return -EEXIST;
+
+error:
+ __fscache_release_cache_tag(tag);
+ _leave(" = -EINVAL");
+ return -EINVAL;
+
+nomem:
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+}
+EXPORT_SYMBOL(fscache_add_cache);
+
+/**
+ * fscache_io_error - Note a cache I/O error
+ * @cache: The record describing the cache
+ *
+ * Note that an I/O error occurred in a cache and that it should no longer be
+ * used for anything. This also reports the error into the kernel log.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+void fscache_io_error(struct fscache_cache *cache)
+{
+ if (!test_and_set_bit(FSCACHE_IOERROR, &cache->flags))
+ pr_err("Cache '%s' stopped due to I/O error\n",
+ cache->ops->name);
+}
+EXPORT_SYMBOL(fscache_io_error);
+
+/*
+ * request withdrawal of all the objects in a cache
+ * - all the objects being withdrawn are moved onto the supplied list
+ */
+static void fscache_withdraw_all_objects(struct fscache_cache *cache,
+ struct list_head *dying_objects)
+{
+ struct fscache_object *object;
+
+ while (!list_empty(&cache->object_list)) {
+ spin_lock(&cache->object_list_lock);
+
+ if (!list_empty(&cache->object_list)) {
+ object = list_entry(cache->object_list.next,
+ struct fscache_object, cache_link);
+ list_move_tail(&object->cache_link, dying_objects);
+
+ _debug("withdraw %x", object->cookie->debug_id);
+
+ /* This must be done under object_list_lock to prevent
+ * a race with fscache_drop_object().
+ */
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_KILL);
+ }
+
+ spin_unlock(&cache->object_list_lock);
+ cond_resched();
+ }
+}
+
+/**
+ * fscache_withdraw_cache - Withdraw a cache from the active service
+ * @cache: The record describing the cache
+ *
+ * Withdraw a cache from service, unbinding all its cache objects from the
+ * netfs cookies they're currently representing.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+void fscache_withdraw_cache(struct fscache_cache *cache)
+{
+ LIST_HEAD(dying_objects);
+
+ _enter("");
+
+ pr_notice("Withdrawing cache \"%s\"\n",
+ cache->tag->name);
+
+ /* make the cache unavailable for cookie acquisition */
+ if (test_and_set_bit(FSCACHE_CACHE_WITHDRAWN, &cache->flags))
+ BUG();
+
+ down_write(&fscache_addremove_sem);
+ list_del_init(&cache->link);
+ cache->tag->cache = NULL;
+ up_write(&fscache_addremove_sem);
+
+ /* make sure all pages pinned by operations on behalf of the netfs are
+ * written to disk */
+ fscache_stat(&fscache_n_cop_sync_cache);
+ cache->ops->sync_cache(cache);
+ fscache_stat_d(&fscache_n_cop_sync_cache);
+
+ /* we now have to destroy all the active objects pertaining to this
+ * cache - which we do by passing them off to thread pool to be
+ * disposed of */
+ _debug("destroy");
+
+ fscache_withdraw_all_objects(cache, &dying_objects);
+
+ /* wait for all extant objects to finish their outstanding operations
+ * and go away */
+ _debug("wait for finish");
+ wait_event(fscache_cache_cleared_wq,
+ atomic_read(&cache->object_count) == 0);
+ _debug("wait for clearance");
+ wait_event(fscache_cache_cleared_wq,
+ list_empty(&cache->object_list));
+ _debug("cleared");
+ ASSERT(list_empty(&dying_objects));
+
+ kobject_put(cache->kobj);
+
+ clear_bit(FSCACHE_TAG_RESERVED, &cache->tag->flags);
+ fscache_release_cache_tag(cache->tag);
+ cache->tag = NULL;
+
+ _leave("");
+}
+EXPORT_SYMBOL(fscache_withdraw_cache);
diff --git a/fs/fscache_old/cookie.c b/fs/fscache_old/cookie.c
new file mode 100644
index 000000000000..8a850c3d0775
--- /dev/null
+++ b/fs/fscache_old/cookie.c
@@ -0,0 +1,1061 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* netfs cookie management
+ *
+ * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for more information on
+ * the netfs API.
+ */
+
+#define FSCACHE_DEBUG_LEVEL COOKIE
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+struct kmem_cache *fscache_cookie_jar;
+
+static atomic_t fscache_object_debug_id = ATOMIC_INIT(0);
+
+#define fscache_cookie_hash_shift 15
+static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift];
+static LIST_HEAD(fscache_cookies);
+static DEFINE_RWLOCK(fscache_cookies_lock);
+
+static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie,
+ loff_t object_size);
+static int fscache_alloc_object(struct fscache_cache *cache,
+ struct fscache_cookie *cookie);
+static int fscache_attach_object(struct fscache_cookie *cookie,
+ struct fscache_object *object);
+
+static void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
+{
+ struct fscache_object *object;
+ struct hlist_node *o;
+ const u8 *k;
+ unsigned loop;
+
+ pr_err("%c-cookie c=%08x [p=%08x fl=%lx nc=%u na=%u]\n",
+ prefix,
+ cookie->debug_id,
+ cookie->parent ? cookie->parent->debug_id : 0,
+ cookie->flags,
+ atomic_read(&cookie->n_children),
+ atomic_read(&cookie->n_active));
+ pr_err("%c-cookie d=%p{%s} n=%p\n",
+ prefix,
+ cookie->def,
+ cookie->def ? cookie->def->name : "?",
+ cookie->netfs_data);
+
+ o = READ_ONCE(cookie->backing_objects.first);
+ if (o) {
+ object = hlist_entry(o, struct fscache_object, cookie_link);
+ pr_err("%c-cookie o=%u\n", prefix, object->debug_id);
+ }
+
+ pr_err("%c-key=[%u] '", prefix, cookie->key_len);
+ k = (cookie->key_len <= sizeof(cookie->inline_key)) ?
+ cookie->inline_key : cookie->key;
+ for (loop = 0; loop < cookie->key_len; loop++)
+ pr_cont("%02x", k[loop]);
+ pr_cont("'\n");
+}
+
+void fscache_free_cookie(struct fscache_cookie *cookie)
+{
+ if (cookie) {
+ BUG_ON(!hlist_empty(&cookie->backing_objects));
+ write_lock(&fscache_cookies_lock);
+ list_del(&cookie->proc_link);
+ write_unlock(&fscache_cookies_lock);
+ if (cookie->aux_len > sizeof(cookie->inline_aux))
+ kfree(cookie->aux);
+ if (cookie->key_len > sizeof(cookie->inline_key))
+ kfree(cookie->key);
+ kmem_cache_free(fscache_cookie_jar, cookie);
+ }
+}
+
+/*
+ * Set the index key in a cookie. The cookie struct has space for a 16-byte
+ * key plus length and hash, but if that's not big enough, it's instead a
+ * pointer to a buffer containing 3 bytes of hash, 1 byte of length and then
+ * the key data.
+ */
+static int fscache_set_key(struct fscache_cookie *cookie,
+ const void *index_key, size_t index_key_len)
+{
+ u32 *buf;
+ int bufs;
+
+ bufs = DIV_ROUND_UP(index_key_len, sizeof(*buf));
+
+ if (index_key_len > sizeof(cookie->inline_key)) {
+ buf = kcalloc(bufs, sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ cookie->key = buf;
+ } else {
+ buf = (u32 *)cookie->inline_key;
+ }
+
+ memcpy(buf, index_key, index_key_len);
+ cookie->key_hash = fscache_hash(0, buf, bufs);
+ return 0;
+}
+
+static long fscache_compare_cookie(const struct fscache_cookie *a,
+ const struct fscache_cookie *b)
+{
+ const void *ka, *kb;
+
+ if (a->key_hash != b->key_hash)
+ return (long)a->key_hash - (long)b->key_hash;
+ if (a->parent != b->parent)
+ return (long)a->parent - (long)b->parent;
+ if (a->key_len != b->key_len)
+ return (long)a->key_len - (long)b->key_len;
+ if (a->type != b->type)
+ return (long)a->type - (long)b->type;
+
+ if (a->key_len <= sizeof(a->inline_key)) {
+ ka = &a->inline_key;
+ kb = &b->inline_key;
+ } else {
+ ka = a->key;
+ kb = b->key;
+ }
+ return memcmp(ka, kb, a->key_len);
+}
+
+static atomic_t fscache_cookie_debug_id = ATOMIC_INIT(1);
+
+/*
+ * Allocate a cookie.
+ */
+struct fscache_cookie *fscache_alloc_cookie(
+ struct fscache_cookie *parent,
+ const struct fscache_cookie_def *def,
+ const void *index_key, size_t index_key_len,
+ const void *aux_data, size_t aux_data_len,
+ void *netfs_data,
+ loff_t object_size)
+{
+ struct fscache_cookie *cookie;
+
+ /* allocate and initialise a cookie */
+ cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
+ if (!cookie)
+ return NULL;
+
+ cookie->key_len = index_key_len;
+ cookie->aux_len = aux_data_len;
+
+ if (fscache_set_key(cookie, index_key, index_key_len) < 0)
+ goto nomem;
+
+ if (cookie->aux_len <= sizeof(cookie->inline_aux)) {
+ memcpy(cookie->inline_aux, aux_data, cookie->aux_len);
+ } else {
+ cookie->aux = kmemdup(aux_data, cookie->aux_len, GFP_KERNEL);
+ if (!cookie->aux)
+ goto nomem;
+ }
+
+ refcount_set(&cookie->ref, 1);
+ atomic_set(&cookie->n_children, 0);
+ cookie->debug_id = atomic_inc_return(&fscache_cookie_debug_id);
+
+ /* We keep the active count elevated until relinquishment to prevent an
+ * attempt to wake up every time the object operations queue quiesces.
+ */
+ atomic_set(&cookie->n_active, 1);
+
+ cookie->def = def;
+ cookie->parent = parent;
+ cookie->netfs_data = netfs_data;
+ cookie->flags = (1 << FSCACHE_COOKIE_NO_DATA_YET);
+ cookie->type = def->type;
+ spin_lock_init(&cookie->lock);
+ INIT_HLIST_HEAD(&cookie->backing_objects);
+
+ write_lock(&fscache_cookies_lock);
+ list_add_tail(&cookie->proc_link, &fscache_cookies);
+ write_unlock(&fscache_cookies_lock);
+ return cookie;
+
+nomem:
+ fscache_free_cookie(cookie);
+ return NULL;
+}
+
+/*
+ * Attempt to insert the new cookie into the hash. If there's a collision, we
+ * return the old cookie if it's not in use and an error otherwise.
+ */
+struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *candidate)
+{
+ struct fscache_cookie *cursor;
+ struct hlist_bl_head *h;
+ struct hlist_bl_node *p;
+ unsigned int bucket;
+
+ bucket = candidate->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
+ h = &fscache_cookie_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_for_each_entry(cursor, p, h, hash_link) {
+ if (fscache_compare_cookie(candidate, cursor) == 0)
+ goto collision;
+ }
+
+ __set_bit(FSCACHE_COOKIE_ACQUIRED, &candidate->flags);
+ fscache_cookie_get(candidate->parent, fscache_cookie_get_acquire_parent);
+ atomic_inc(&candidate->parent->n_children);
+ hlist_bl_add_head(&candidate->hash_link, h);
+ hlist_bl_unlock(h);
+ return candidate;
+
+collision:
+ if (test_and_set_bit(FSCACHE_COOKIE_ACQUIRED, &cursor->flags)) {
+ trace_fscache_cookie(cursor->debug_id, refcount_read(&cursor->ref),
+ fscache_cookie_collision);
+ pr_err("Duplicate cookie detected\n");
+ fscache_print_cookie(cursor, 'O');
+ fscache_print_cookie(candidate, 'N');
+ hlist_bl_unlock(h);
+ return NULL;
+ }
+
+ fscache_cookie_get(cursor, fscache_cookie_get_reacquire);
+ hlist_bl_unlock(h);
+ return cursor;
+}
+
+/*
+ * request a cookie to represent an object (index, datafile, xattr, etc)
+ * - parent specifies the parent object
+ * - the top level index cookie for each netfs is stored in the fscache_netfs
+ * struct upon registration
+ * - def points to the definition
+ * - the netfs_data will be passed to the functions pointed to in *def
+ * - all attached caches will be searched to see if they contain this object
+ * - index objects aren't stored on disk until there's a dependent file that
+ * needs storing
+ * - other objects are stored in a selected cache immediately, and all the
+ * indices forming the path to it are instantiated if necessary
+ * - we never let on to the netfs about errors
+ * - we may set a negative cookie pointer, but that's okay
+ */
+struct fscache_cookie *__fscache_acquire_cookie(
+ struct fscache_cookie *parent,
+ const struct fscache_cookie_def *def,
+ const void *index_key, size_t index_key_len,
+ const void *aux_data, size_t aux_data_len,
+ void *netfs_data,
+ loff_t object_size,
+ bool enable)
+{
+ struct fscache_cookie *candidate, *cookie;
+
+ BUG_ON(!def);
+
+ _enter("{%s},{%s},%p,%u",
+ parent ? (char *) parent->def->name : "<no-parent>",
+ def->name, netfs_data, enable);
+
+ if (!index_key || !index_key_len || index_key_len > 255 || aux_data_len > 255)
+ return NULL;
+ if (!aux_data || !aux_data_len) {
+ aux_data = NULL;
+ aux_data_len = 0;
+ }
+
+ fscache_stat(&fscache_n_acquires);
+
+ /* if there's no parent cookie, then we don't create one here either */
+ if (!parent) {
+ fscache_stat(&fscache_n_acquires_null);
+ _leave(" [no parent]");
+ return NULL;
+ }
+
+ /* validate the definition */
+ BUG_ON(!def->name[0]);
+
+ BUG_ON(def->type == FSCACHE_COOKIE_TYPE_INDEX &&
+ parent->type != FSCACHE_COOKIE_TYPE_INDEX);
+
+ candidate = fscache_alloc_cookie(parent, def,
+ index_key, index_key_len,
+ aux_data, aux_data_len,
+ netfs_data, object_size);
+ if (!candidate) {
+ fscache_stat(&fscache_n_acquires_oom);
+ _leave(" [ENOMEM]");
+ return NULL;
+ }
+
+ cookie = fscache_hash_cookie(candidate);
+ if (!cookie) {
+ trace_fscache_cookie(candidate->debug_id, 1,
+ fscache_cookie_discard);
+ goto out;
+ }
+
+ if (cookie == candidate)
+ candidate = NULL;
+
+ switch (cookie->type) {
+ case FSCACHE_COOKIE_TYPE_INDEX:
+ fscache_stat(&fscache_n_cookie_index);
+ break;
+ case FSCACHE_COOKIE_TYPE_DATAFILE:
+ fscache_stat(&fscache_n_cookie_data);
+ break;
+ default:
+ fscache_stat(&fscache_n_cookie_special);
+ break;
+ }
+
+ trace_fscache_acquire(cookie);
+
+ if (enable) {
+ /* if the object is an index then we need do nothing more here
+ * - we create indices on disk when we need them as an index
+ * may exist in multiple caches */
+ if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ if (fscache_acquire_non_index_cookie(cookie, object_size) == 0) {
+ set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
+ } else {
+ atomic_dec(&parent->n_children);
+ fscache_cookie_put(cookie,
+ fscache_cookie_put_acquire_nobufs);
+ fscache_stat(&fscache_n_acquires_nobufs);
+ _leave(" = NULL");
+ return NULL;
+ }
+ } else {
+ set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
+ }
+ }
+
+ fscache_stat(&fscache_n_acquires_ok);
+
+out:
+ fscache_free_cookie(candidate);
+ return cookie;
+}
+EXPORT_SYMBOL(__fscache_acquire_cookie);
+
+/*
+ * Enable a cookie to permit it to accept new operations.
+ */
+void __fscache_enable_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ loff_t object_size,
+ bool (*can_enable)(void *data),
+ void *data)
+{
+ _enter("%x", cookie->debug_id);
+
+ trace_fscache_enable(cookie);
+
+ wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
+ TASK_UNINTERRUPTIBLE);
+
+ fscache_update_aux(cookie, aux_data);
+
+ if (test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
+ goto out_unlock;
+
+ if (can_enable && !can_enable(data)) {
+ /* The netfs decided it didn't want to enable after all */
+ } else if (cookie->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ /* Wait for outstanding disablement to complete */
+ __fscache_wait_on_invalidate(cookie);
+
+ if (fscache_acquire_non_index_cookie(cookie, object_size) == 0)
+ set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
+ } else {
+ set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
+ }
+
+out_unlock:
+ clear_bit_unlock(FSCACHE_COOKIE_ENABLEMENT_LOCK, &cookie->flags);
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK);
+}
+EXPORT_SYMBOL(__fscache_enable_cookie);
+
+/*
+ * acquire a non-index cookie
+ * - this must make sure the index chain is instantiated and instantiate the
+ * object representation too
+ */
+static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie,
+ loff_t object_size)
+{
+ struct fscache_object *object;
+ struct fscache_cache *cache;
+ int ret;
+
+ _enter("");
+
+ set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
+
+ /* now we need to see whether the backing objects for this cookie yet
+ * exist, if not there'll be nothing to search */
+ down_read(&fscache_addremove_sem);
+
+ if (list_empty(&fscache_cache_list)) {
+ up_read(&fscache_addremove_sem);
+ _leave(" = 0 [no caches]");
+ return 0;
+ }
+
+ /* select a cache in which to store the object */
+ cache = fscache_select_cache_for_object(cookie->parent);
+ if (!cache) {
+ up_read(&fscache_addremove_sem);
+ fscache_stat(&fscache_n_acquires_no_cache);
+ _leave(" = -ENOMEDIUM [no cache]");
+ return -ENOMEDIUM;
+ }
+
+ _debug("cache %s", cache->tag->name);
+
+ set_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
+
+ /* ask the cache to allocate objects for this cookie and its parent
+ * chain */
+ ret = fscache_alloc_object(cache, cookie);
+ if (ret < 0) {
+ up_read(&fscache_addremove_sem);
+ _leave(" = %d", ret);
+ return ret;
+ }
+
+ spin_lock(&cookie->lock);
+ if (hlist_empty(&cookie->backing_objects)) {
+ spin_unlock(&cookie->lock);
+ goto unavailable;
+ }
+
+ object = hlist_entry(cookie->backing_objects.first,
+ struct fscache_object, cookie_link);
+
+ fscache_set_store_limit(object, object_size);
+
+ /* initiate the process of looking up all the objects in the chain
+ * (done by fscache_initialise_object()) */
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_NEW_CHILD);
+
+ spin_unlock(&cookie->lock);
+
+ /* we may be required to wait for lookup to complete at this point */
+ if (!fscache_defer_lookup) {
+ wait_on_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP,
+ TASK_UNINTERRUPTIBLE);
+ if (test_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags))
+ goto unavailable;
+ }
+
+ up_read(&fscache_addremove_sem);
+ _leave(" = 0 [deferred]");
+ return 0;
+
+unavailable:
+ up_read(&fscache_addremove_sem);
+ _leave(" = -ENOBUFS");
+ return -ENOBUFS;
+}
+
+/*
+ * recursively allocate cache object records for a cookie/cache combination
+ * - caller must be holding the addremove sem
+ */
+static int fscache_alloc_object(struct fscache_cache *cache,
+ struct fscache_cookie *cookie)
+{
+ struct fscache_object *object;
+ int ret;
+
+ _enter("%s,%x{%s}", cache->tag->name, cookie->debug_id, cookie->def->name);
+
+ spin_lock(&cookie->lock);
+ hlist_for_each_entry(object, &cookie->backing_objects,
+ cookie_link) {
+ if (object->cache == cache)
+ goto object_already_extant;
+ }
+ spin_unlock(&cookie->lock);
+
+ /* ask the cache to allocate an object (we may end up with duplicate
+ * objects at this stage, but we sort that out later) */
+ fscache_stat(&fscache_n_cop_alloc_object);
+ object = cache->ops->alloc_object(cache, cookie);
+ fscache_stat_d(&fscache_n_cop_alloc_object);
+ if (IS_ERR(object)) {
+ fscache_stat(&fscache_n_object_no_alloc);
+ ret = PTR_ERR(object);
+ goto error;
+ }
+
+ ASSERTCMP(object->cookie, ==, cookie);
+ fscache_stat(&fscache_n_object_alloc);
+
+ object->debug_id = atomic_inc_return(&fscache_object_debug_id);
+
+ _debug("ALLOC OBJ%x: %s {%lx}",
+ object->debug_id, cookie->def->name, object->events);
+
+ ret = fscache_alloc_object(cache, cookie->parent);
+ if (ret < 0)
+ goto error_put;
+
+ /* only attach if we managed to allocate all we needed, otherwise
+ * discard the object we just allocated and instead use the one
+ * attached to the cookie */
+ if (fscache_attach_object(cookie, object) < 0) {
+ fscache_stat(&fscache_n_cop_put_object);
+ cache->ops->put_object(object, fscache_obj_put_attach_fail);
+ fscache_stat_d(&fscache_n_cop_put_object);
+ }
+
+ _leave(" = 0");
+ return 0;
+
+object_already_extant:
+ ret = -ENOBUFS;
+ if (fscache_object_is_dying(object) ||
+ fscache_cache_is_broken(object)) {
+ spin_unlock(&cookie->lock);
+ goto error;
+ }
+ spin_unlock(&cookie->lock);
+ _leave(" = 0 [found]");
+ return 0;
+
+error_put:
+ fscache_stat(&fscache_n_cop_put_object);
+ cache->ops->put_object(object, fscache_obj_put_alloc_fail);
+ fscache_stat_d(&fscache_n_cop_put_object);
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * attach a cache object to a cookie
+ */
+static int fscache_attach_object(struct fscache_cookie *cookie,
+ struct fscache_object *object)
+{
+ struct fscache_object *p;
+ struct fscache_cache *cache = object->cache;
+ int ret;
+
+ _enter("{%s},{OBJ%x}", cookie->def->name, object->debug_id);
+
+ ASSERTCMP(object->cookie, ==, cookie);
+
+ spin_lock(&cookie->lock);
+
+ /* there may be multiple initial creations of this object, but we only
+ * want one */
+ ret = -EEXIST;
+ hlist_for_each_entry(p, &cookie->backing_objects, cookie_link) {
+ if (p->cache == object->cache) {
+ if (fscache_object_is_dying(p))
+ ret = -ENOBUFS;
+ goto cant_attach_object;
+ }
+ }
+
+ /* pin the parent object */
+ spin_lock_nested(&cookie->parent->lock, 1);
+ hlist_for_each_entry(p, &cookie->parent->backing_objects,
+ cookie_link) {
+ if (p->cache == object->cache) {
+ if (fscache_object_is_dying(p)) {
+ ret = -ENOBUFS;
+ spin_unlock(&cookie->parent->lock);
+ goto cant_attach_object;
+ }
+ object->parent = p;
+ spin_lock(&p->lock);
+ p->n_children++;
+ spin_unlock(&p->lock);
+ break;
+ }
+ }
+ spin_unlock(&cookie->parent->lock);
+
+ /* attach to the cache's object list */
+ if (list_empty(&object->cache_link)) {
+ spin_lock(&cache->object_list_lock);
+ list_add(&object->cache_link, &cache->object_list);
+ spin_unlock(&cache->object_list_lock);
+ }
+
+ /* Attach to the cookie. The object already has a ref on it. */
+ hlist_add_head(&object->cookie_link, &cookie->backing_objects);
+ ret = 0;
+
+cant_attach_object:
+ spin_unlock(&cookie->lock);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Invalidate an object. Callable with spinlocks held.
+ */
+void __fscache_invalidate(struct fscache_cookie *cookie)
+{
+ struct fscache_object *object;
+
+ _enter("{%s}", cookie->def->name);
+
+ fscache_stat(&fscache_n_invalidates);
+
+ /* Only permit invalidation of data files. Invalidating an index will
+ * require the caller to release all its attachments to the tree rooted
+ * there, and if it's doing that, it may as well just retire the
+ * cookie.
+ */
+ ASSERTCMP(cookie->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
+
+ /* If there's an object, we tell the object state machine to handle the
+ * invalidation on our behalf, otherwise there's nothing to do.
+ */
+ if (!hlist_empty(&cookie->backing_objects)) {
+ spin_lock(&cookie->lock);
+
+ if (fscache_cookie_enabled(cookie) &&
+ !hlist_empty(&cookie->backing_objects) &&
+ !test_and_set_bit(FSCACHE_COOKIE_INVALIDATING,
+ &cookie->flags)) {
+ object = hlist_entry(cookie->backing_objects.first,
+ struct fscache_object,
+ cookie_link);
+ if (fscache_object_is_live(object))
+ fscache_raise_event(
+ object, FSCACHE_OBJECT_EV_INVALIDATE);
+ }
+
+ spin_unlock(&cookie->lock);
+ }
+
+ _leave("");
+}
+EXPORT_SYMBOL(__fscache_invalidate);
+
+/*
+ * Wait for object invalidation to complete.
+ */
+void __fscache_wait_on_invalidate(struct fscache_cookie *cookie)
+{
+ _enter("%x", cookie->debug_id);
+
+ wait_on_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING,
+ TASK_UNINTERRUPTIBLE);
+
+ _leave("");
+}
+EXPORT_SYMBOL(__fscache_wait_on_invalidate);
+
+/*
+ * update the index entries backing a cookie
+ */
+void __fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data)
+{
+ struct fscache_object *object;
+
+ fscache_stat(&fscache_n_updates);
+
+ if (!cookie) {
+ fscache_stat(&fscache_n_updates_null);
+ _leave(" [no cookie]");
+ return;
+ }
+
+ _enter("{%s}", cookie->def->name);
+
+ spin_lock(&cookie->lock);
+
+ fscache_update_aux(cookie, aux_data);
+
+ if (fscache_cookie_enabled(cookie)) {
+ /* update the index entry on disk in each cache backing this
+ * cookie.
+ */
+ hlist_for_each_entry(object,
+ &cookie->backing_objects, cookie_link) {
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_UPDATE);
+ }
+ }
+
+ spin_unlock(&cookie->lock);
+ _leave("");
+}
+EXPORT_SYMBOL(__fscache_update_cookie);
+
+/*
+ * Disable a cookie to stop it from accepting new requests from the netfs.
+ */
+void __fscache_disable_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ bool invalidate)
+{
+ struct fscache_object *object;
+ bool awaken = false;
+
+ _enter("%x,%u", cookie->debug_id, invalidate);
+
+ trace_fscache_disable(cookie);
+
+ ASSERTCMP(atomic_read(&cookie->n_active), >, 0);
+
+ if (atomic_read(&cookie->n_children) != 0) {
+ pr_err("Cookie '%s' still has children\n",
+ cookie->def->name);
+ BUG();
+ }
+
+ wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
+ TASK_UNINTERRUPTIBLE);
+
+ fscache_update_aux(cookie, aux_data);
+
+ if (!test_and_clear_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
+ goto out_unlock_enable;
+
+ /* If the cookie is being invalidated, wait for that to complete first
+ * so that we can reuse the flag.
+ */
+ __fscache_wait_on_invalidate(cookie);
+
+ /* Dispose of the backing objects */
+ set_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags);
+
+ spin_lock(&cookie->lock);
+ if (!hlist_empty(&cookie->backing_objects)) {
+ hlist_for_each_entry(object, &cookie->backing_objects, cookie_link) {
+ if (invalidate)
+ set_bit(FSCACHE_OBJECT_RETIRED, &object->flags);
+ clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_KILL);
+ }
+ } else {
+ if (test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
+ awaken = true;
+ }
+ spin_unlock(&cookie->lock);
+ if (awaken)
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
+
+ /* Wait for cessation of activity requiring access to the netfs (when
+ * n_active reaches 0). This makes sure outstanding reads and writes
+ * have completed.
+ */
+ if (!atomic_dec_and_test(&cookie->n_active)) {
+ wait_var_event(&cookie->n_active,
+ !atomic_read(&cookie->n_active));
+ }
+
+ /* Reset the cookie state if it wasn't relinquished */
+ if (!test_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags)) {
+ atomic_inc(&cookie->n_active);
+ set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
+ }
+
+out_unlock_enable:
+ clear_bit_unlock(FSCACHE_COOKIE_ENABLEMENT_LOCK, &cookie->flags);
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK);
+ _leave("");
+}
+EXPORT_SYMBOL(__fscache_disable_cookie);
+
+/*
+ * release a cookie back to the cache
+ * - the object will be marked as recyclable on disk if retire is true
+ * - all dependents of this cookie must have already been unregistered
+ * (indices/files/pages)
+ */
+void __fscache_relinquish_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ bool retire)
+{
+ fscache_stat(&fscache_n_relinquishes);
+ if (retire)
+ fscache_stat(&fscache_n_relinquishes_retire);
+
+ if (!cookie) {
+ fscache_stat(&fscache_n_relinquishes_null);
+ _leave(" [no cookie]");
+ return;
+ }
+
+ _enter("%x{%s,%d},%d",
+ cookie->debug_id, cookie->def->name,
+ atomic_read(&cookie->n_active), retire);
+
+ trace_fscache_relinquish(cookie, retire);
+
+ /* No further netfs-accessing operations on this cookie permitted */
+ if (test_and_set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags))
+ BUG();
+
+ __fscache_disable_cookie(cookie, aux_data, retire);
+
+ /* Clear pointers back to the netfs */
+ cookie->netfs_data = NULL;
+ cookie->def = NULL;
+
+ if (cookie->parent) {
+ ASSERTCMP(refcount_read(&cookie->parent->ref), >, 0);
+ ASSERTCMP(atomic_read(&cookie->parent->n_children), >, 0);
+ atomic_dec(&cookie->parent->n_children);
+ }
+
+ /* Dispose of the netfs's link to the cookie */
+ fscache_cookie_put(cookie, fscache_cookie_put_relinquish);
+
+ _leave("");
+}
+EXPORT_SYMBOL(__fscache_relinquish_cookie);
+
+/*
+ * Remove a cookie from the hash table.
+ */
+static void fscache_unhash_cookie(struct fscache_cookie *cookie)
+{
+ struct hlist_bl_head *h;
+ unsigned int bucket;
+
+ bucket = cookie->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
+ h = &fscache_cookie_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_del(&cookie->hash_link);
+ hlist_bl_unlock(h);
+}
+
+/*
+ * Drop a reference to a cookie.
+ */
+void fscache_cookie_put(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
+{
+ struct fscache_cookie *parent;
+ int ref;
+
+ _enter("%x", cookie->debug_id);
+
+ do {
+ unsigned int cookie_debug_id = cookie->debug_id;
+ bool zero = __refcount_dec_and_test(&cookie->ref, &ref);
+
+ trace_fscache_cookie(cookie_debug_id, ref - 1, where);
+ if (!zero)
+ return;
+
+ parent = cookie->parent;
+ fscache_unhash_cookie(cookie);
+ fscache_free_cookie(cookie);
+
+ cookie = parent;
+ where = fscache_cookie_put_parent;
+ } while (cookie);
+
+ _leave("");
+}
+
+/*
+ * Get a reference to a cookie.
+ */
+struct fscache_cookie *fscache_cookie_get(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
+{
+ int ref;
+
+ __refcount_inc(&cookie->ref, &ref);
+ trace_fscache_cookie(cookie->debug_id, ref + 1, where);
+ return cookie;
+}
+
+/*
+ * check the consistency between the netfs inode and the backing cache
+ *
+ * NOTE: it only serves no-index type
+ */
+int __fscache_check_consistency(struct fscache_cookie *cookie,
+ const void *aux_data)
+{
+ struct fscache_operation *op;
+ struct fscache_object *object;
+ bool wake_cookie = false;
+ int ret;
+
+ _enter("%p,", cookie);
+
+ ASSERTCMP(cookie->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
+
+ if (fscache_wait_for_deferred_lookup(cookie) < 0)
+ return -ERESTARTSYS;
+
+ if (hlist_empty(&cookie->backing_objects))
+ return 0;
+
+ op = kzalloc(sizeof(*op), GFP_NOIO | __GFP_NOMEMALLOC | __GFP_NORETRY);
+ if (!op)
+ return -ENOMEM;
+
+ fscache_operation_init(cookie, op, NULL, NULL, NULL);
+ op->flags = FSCACHE_OP_MYTHREAD |
+ (1 << FSCACHE_OP_WAITING) |
+ (1 << FSCACHE_OP_UNUSE_COOKIE);
+ trace_fscache_page_op(cookie, NULL, op, fscache_page_op_check_consistency);
+
+ spin_lock(&cookie->lock);
+
+ fscache_update_aux(cookie, aux_data);
+
+ if (!fscache_cookie_enabled(cookie) ||
+ hlist_empty(&cookie->backing_objects))
+ goto inconsistent;
+ object = hlist_entry(cookie->backing_objects.first,
+ struct fscache_object, cookie_link);
+ if (test_bit(FSCACHE_IOERROR, &object->cache->flags))
+ goto inconsistent;
+
+ op->debug_id = atomic_inc_return(&fscache_op_debug_id);
+
+ __fscache_use_cookie(cookie);
+ if (fscache_submit_op(object, op) < 0)
+ goto submit_failed;
+
+ /* the work queue now carries its own ref on the object */
+ spin_unlock(&cookie->lock);
+
+ ret = fscache_wait_for_operation_activation(object, op, NULL, NULL);
+ if (ret == 0) {
+ /* ask the cache to honour the operation */
+ ret = object->cache->ops->check_consistency(op);
+ fscache_op_complete(op, false);
+ } else if (ret == -ENOBUFS) {
+ ret = 0;
+ }
+
+ fscache_put_operation(op);
+ _leave(" = %d", ret);
+ return ret;
+
+submit_failed:
+ wake_cookie = __fscache_unuse_cookie(cookie);
+inconsistent:
+ spin_unlock(&cookie->lock);
+ if (wake_cookie)
+ __fscache_wake_unused_cookie(cookie);
+ kfree(op);
+ _leave(" = -ESTALE");
+ return -ESTALE;
+}
+EXPORT_SYMBOL(__fscache_check_consistency);
+
+/*
+ * Generate a list of extant cookies in /proc/fs/fscache/cookies
+ */
+static int fscache_cookies_seq_show(struct seq_file *m, void *v)
+{
+ struct fscache_cookie *cookie;
+ unsigned int keylen = 0, auxlen = 0;
+ char _type[3], *type;
+ u8 *p;
+
+ if (v == &fscache_cookies) {
+ seq_puts(m,
+ "COOKIE PARENT USAGE CHILD ACT TY FL DEF NETFS_DATA\n"
+ "======== ======== ===== ===== === == === ================ ==========\n"
+ );
+ return 0;
+ }
+
+ cookie = list_entry(v, struct fscache_cookie, proc_link);
+
+ switch (cookie->type) {
+ case 0:
+ type = "IX";
+ break;
+ case 1:
+ type = "DT";
+ break;
+ default:
+ snprintf(_type, sizeof(_type), "%02u",
+ cookie->type);
+ type = _type;
+ break;
+ }
+
+ seq_printf(m,
+ "%08x %08x %5u %5u %3u %s %03lx %-16s %px",
+ cookie->debug_id,
+ cookie->parent ? cookie->parent->debug_id : 0,
+ refcount_read(&cookie->ref),
+ atomic_read(&cookie->n_children),
+ atomic_read(&cookie->n_active),
+ type,
+ cookie->flags,
+ cookie->def->name,
+ cookie->netfs_data);
+
+ keylen = cookie->key_len;
+ auxlen = cookie->aux_len;
+
+ if (keylen > 0 || auxlen > 0) {
+ seq_puts(m, " ");
+ p = keylen <= sizeof(cookie->inline_key) ?
+ cookie->inline_key : cookie->key;
+ for (; keylen > 0; keylen--)
+ seq_printf(m, "%02x", *p++);
+ if (auxlen > 0) {
+ seq_puts(m, ", ");
+ p = auxlen <= sizeof(cookie->inline_aux) ?
+ cookie->inline_aux : cookie->aux;
+ for (; auxlen > 0; auxlen--)
+ seq_printf(m, "%02x", *p++);
+ }
+ }
+
+ seq_puts(m, "\n");
+ return 0;
+}
+
+static void *fscache_cookies_seq_start(struct seq_file *m, loff_t *_pos)
+ __acquires(fscache_cookies_lock)
+{
+ read_lock(&fscache_cookies_lock);
+ return seq_list_start_head(&fscache_cookies, *_pos);
+}
+
+static void *fscache_cookies_seq_next(struct seq_file *m, void *v, loff_t *_pos)
+{
+ return seq_list_next(v, &fscache_cookies, _pos);
+}
+
+static void fscache_cookies_seq_stop(struct seq_file *m, void *v)
+ __releases(rcu)
+{
+ read_unlock(&fscache_cookies_lock);
+}
+
+
+const struct seq_operations fscache_cookies_seq_ops = {
+ .start = fscache_cookies_seq_start,
+ .next = fscache_cookies_seq_next,
+ .stop = fscache_cookies_seq_stop,
+ .show = fscache_cookies_seq_show,
+};
diff --git a/fs/fscache_old/fsdef.c b/fs/fscache_old/fsdef.c
new file mode 100644
index 000000000000..0402673c680e
--- /dev/null
+++ b/fs/fscache_old/fsdef.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Filesystem index definition
+ *
+ * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/module.h>
+#include "internal.h"
+
+static
+enum fscache_checkaux fscache_fsdef_netfs_check_aux(void *cookie_netfs_data,
+ const void *data,
+ uint16_t datalen,
+ loff_t object_size);
+
+/*
+ * The root index is owned by FS-Cache itself.
+ *
+ * When a netfs requests caching facilities, FS-Cache will, if one doesn't
+ * already exist, create an entry in the root index with the key being the name
+ * of the netfs ("AFS" for example), and the auxiliary data holding the index
+ * structure version supplied by the netfs:
+ *
+ * FSDEF
+ * |
+ * +-----------+
+ * | |
+ * NFS AFS
+ * [v=1] [v=1]
+ *
+ * If an entry with the appropriate name does already exist, the version is
+ * compared. If the version is different, the entire subtree from that entry
+ * will be discarded and a new entry created.
+ *
+ * The new entry will be an index, and a cookie referring to it will be passed
+ * to the netfs. This is then the root handle by which the netfs accesses the
+ * cache. It can create whatever objects it likes in that index, including
+ * further indices.
+ */
+static struct fscache_cookie_def fscache_fsdef_index_def = {
+ .name = ".FS-Cache",
+ .type = FSCACHE_COOKIE_TYPE_INDEX,
+};
+
+struct fscache_cookie fscache_fsdef_index = {
+ .debug_id = 1,
+ .ref = REFCOUNT_INIT(1),
+ .n_active = ATOMIC_INIT(1),
+ .lock = __SPIN_LOCK_UNLOCKED(fscache_fsdef_index.lock),
+ .backing_objects = HLIST_HEAD_INIT,
+ .def = &fscache_fsdef_index_def,
+ .flags = 1 << FSCACHE_COOKIE_ENABLED,
+ .type = FSCACHE_COOKIE_TYPE_INDEX,
+};
+EXPORT_SYMBOL(fscache_fsdef_index);
+
+/*
+ * Definition of an entry in the root index. Each entry is an index, keyed to
+ * a specific netfs and only applicable to a particular version of the index
+ * structure used by that netfs.
+ */
+struct fscache_cookie_def fscache_fsdef_netfs_def = {
+ .name = "FSDEF.netfs",
+ .type = FSCACHE_COOKIE_TYPE_INDEX,
+ .check_aux = fscache_fsdef_netfs_check_aux,
+};
+
+/*
+ * check that the index structure version number stored in the auxiliary data
+ * matches the one the netfs gave us
+ */
+static enum fscache_checkaux fscache_fsdef_netfs_check_aux(
+ void *cookie_netfs_data,
+ const void *data,
+ uint16_t datalen,
+ loff_t object_size)
+{
+ struct fscache_netfs *netfs = cookie_netfs_data;
+ uint32_t version;
+
+ _enter("{%s},,%hu", netfs->name, datalen);
+
+ if (datalen != sizeof(version)) {
+ _leave(" = OBSOLETE [dl=%d v=%zu]", datalen, sizeof(version));
+ return FSCACHE_CHECKAUX_OBSOLETE;
+ }
+
+ memcpy(&version, data, sizeof(version));
+ if (version != netfs->version) {
+ _leave(" = OBSOLETE [ver=%x net=%x]", version, netfs->version);
+ return FSCACHE_CHECKAUX_OBSOLETE;
+ }
+
+ _leave(" = OKAY");
+ return FSCACHE_CHECKAUX_OKAY;
+}
diff --git a/fs/fscache_old/internal.h b/fs/fscache_old/internal.h
new file mode 100644
index 000000000000..7288622cf2c3
--- /dev/null
+++ b/fs/fscache_old/internal.h
@@ -0,0 +1,409 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Internal definitions for FS-Cache
+ *
+ * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+/*
+ * Lock order, in the order in which multiple locks should be obtained:
+ * - fscache_addremove_sem
+ * - cookie->lock
+ * - cookie->parent->lock
+ * - cache->object_list_lock
+ * - object->lock
+ * - object->parent->lock
+ * - cookie->stores_lock
+ * - fscache_thread_lock
+ *
+ */
+
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+
+#define pr_fmt(fmt) "FS-Cache: " fmt
+
+#include <linux/fscache_old-cache.h>
+#include <trace/events/fscache_old.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+
+#define FSCACHE_MIN_THREADS 4
+#define FSCACHE_MAX_THREADS 32
+
+/*
+ * cache.c
+ */
+extern struct list_head fscache_cache_list;
+extern struct rw_semaphore fscache_addremove_sem;
+
+extern struct fscache_cache *fscache_select_cache_for_object(
+ struct fscache_cookie *);
+
+/*
+ * cookie.c
+ */
+extern struct kmem_cache *fscache_cookie_jar;
+extern const struct seq_operations fscache_cookies_seq_ops;
+
+extern void fscache_free_cookie(struct fscache_cookie *);
+extern struct fscache_cookie *fscache_alloc_cookie(struct fscache_cookie *,
+ const struct fscache_cookie_def *,
+ const void *, size_t,
+ const void *, size_t,
+ void *, loff_t);
+extern struct fscache_cookie *fscache_hash_cookie(struct fscache_cookie *);
+extern struct fscache_cookie *fscache_cookie_get(struct fscache_cookie *,
+ enum fscache_cookie_trace);
+extern void fscache_cookie_put(struct fscache_cookie *,
+ enum fscache_cookie_trace);
+
+static inline void fscache_cookie_see(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
+{
+ trace_fscache_cookie(cookie->debug_id, refcount_read(&cookie->ref),
+ where);
+}
+
+/*
+ * fsdef.c
+ */
+extern struct fscache_cookie fscache_fsdef_index;
+extern struct fscache_cookie_def fscache_fsdef_netfs_def;
+
+/*
+ * main.c
+ */
+extern unsigned fscache_defer_lookup;
+extern unsigned fscache_defer_create;
+extern unsigned fscache_debug;
+extern struct kobject *fscache_root;
+extern struct workqueue_struct *fscache_object_wq;
+extern struct workqueue_struct *fscache_op_wq;
+DECLARE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
+
+extern unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n);
+
+static inline bool fscache_object_congested(void)
+{
+ return workqueue_congested(WORK_CPU_UNBOUND, fscache_object_wq);
+}
+
+/*
+ * object.c
+ */
+extern void fscache_enqueue_object(struct fscache_object *);
+
+/*
+ * operation.c
+ */
+extern int fscache_submit_exclusive_op(struct fscache_object *,
+ struct fscache_operation *);
+extern int fscache_submit_op(struct fscache_object *,
+ struct fscache_operation *);
+extern int fscache_cancel_op(struct fscache_operation *, bool);
+extern void fscache_cancel_all_ops(struct fscache_object *);
+extern void fscache_abort_object(struct fscache_object *);
+extern void fscache_start_operations(struct fscache_object *);
+extern void fscache_operation_gc(struct work_struct *);
+
+/*
+ * page.c
+ */
+extern int fscache_wait_for_deferred_lookup(struct fscache_cookie *);
+extern int fscache_wait_for_operation_activation(struct fscache_object *,
+ struct fscache_operation *,
+ atomic_t *,
+ atomic_t *);
+
+/*
+ * proc.c
+ */
+#ifdef CONFIG_PROC_FS
+extern int __init fscache_proc_init(void);
+extern void fscache_proc_cleanup(void);
+#else
+#define fscache_proc_init() (0)
+#define fscache_proc_cleanup() do {} while (0)
+#endif
+
+/*
+ * stats.c
+ */
+#ifdef CONFIG_FSCACHE_STATS
+extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
+extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];
+
+extern atomic_t fscache_n_op_pend;
+extern atomic_t fscache_n_op_run;
+extern atomic_t fscache_n_op_enqueue;
+extern atomic_t fscache_n_op_deferred_release;
+extern atomic_t fscache_n_op_initialised;
+extern atomic_t fscache_n_op_release;
+extern atomic_t fscache_n_op_gc;
+extern atomic_t fscache_n_op_cancelled;
+extern atomic_t fscache_n_op_rejected;
+
+extern atomic_t fscache_n_attr_changed;
+extern atomic_t fscache_n_attr_changed_ok;
+extern atomic_t fscache_n_attr_changed_nobufs;
+extern atomic_t fscache_n_attr_changed_nomem;
+extern atomic_t fscache_n_attr_changed_calls;
+
+extern atomic_t fscache_n_retrievals;
+extern atomic_t fscache_n_retrievals_ok;
+extern atomic_t fscache_n_retrievals_wait;
+extern atomic_t fscache_n_retrievals_nodata;
+extern atomic_t fscache_n_retrievals_nobufs;
+extern atomic_t fscache_n_retrievals_intr;
+extern atomic_t fscache_n_retrievals_nomem;
+extern atomic_t fscache_n_retrievals_object_dead;
+extern atomic_t fscache_n_retrieval_ops;
+extern atomic_t fscache_n_retrieval_op_waits;
+
+extern atomic_t fscache_n_stores;
+extern atomic_t fscache_n_stores_ok;
+extern atomic_t fscache_n_stores_again;
+extern atomic_t fscache_n_stores_nobufs;
+extern atomic_t fscache_n_stores_intr;
+extern atomic_t fscache_n_stores_oom;
+extern atomic_t fscache_n_store_ops;
+extern atomic_t fscache_n_stores_object_dead;
+extern atomic_t fscache_n_store_op_waits;
+
+extern atomic_t fscache_n_acquires;
+extern atomic_t fscache_n_acquires_null;
+extern atomic_t fscache_n_acquires_no_cache;
+extern atomic_t fscache_n_acquires_ok;
+extern atomic_t fscache_n_acquires_nobufs;
+extern atomic_t fscache_n_acquires_oom;
+
+extern atomic_t fscache_n_invalidates;
+extern atomic_t fscache_n_invalidates_run;
+
+extern atomic_t fscache_n_updates;
+extern atomic_t fscache_n_updates_null;
+extern atomic_t fscache_n_updates_run;
+
+extern atomic_t fscache_n_relinquishes;
+extern atomic_t fscache_n_relinquishes_null;
+extern atomic_t fscache_n_relinquishes_waitcrt;
+extern atomic_t fscache_n_relinquishes_retire;
+
+extern atomic_t fscache_n_cookie_index;
+extern atomic_t fscache_n_cookie_data;
+extern atomic_t fscache_n_cookie_special;
+
+extern atomic_t fscache_n_object_alloc;
+extern atomic_t fscache_n_object_no_alloc;
+extern atomic_t fscache_n_object_lookups;
+extern atomic_t fscache_n_object_lookups_negative;
+extern atomic_t fscache_n_object_lookups_positive;
+extern atomic_t fscache_n_object_lookups_timed_out;
+extern atomic_t fscache_n_object_created;
+extern atomic_t fscache_n_object_avail;
+extern atomic_t fscache_n_object_dead;
+
+extern atomic_t fscache_n_checkaux_none;
+extern atomic_t fscache_n_checkaux_okay;
+extern atomic_t fscache_n_checkaux_update;
+extern atomic_t fscache_n_checkaux_obsolete;
+
+extern atomic_t fscache_n_cop_alloc_object;
+extern atomic_t fscache_n_cop_lookup_object;
+extern atomic_t fscache_n_cop_lookup_complete;
+extern atomic_t fscache_n_cop_grab_object;
+extern atomic_t fscache_n_cop_invalidate_object;
+extern atomic_t fscache_n_cop_update_object;
+extern atomic_t fscache_n_cop_drop_object;
+extern atomic_t fscache_n_cop_put_object;
+extern atomic_t fscache_n_cop_sync_cache;
+extern atomic_t fscache_n_cop_attr_changed;
+
+extern atomic_t fscache_n_cache_no_space_reject;
+extern atomic_t fscache_n_cache_stale_objects;
+extern atomic_t fscache_n_cache_retired_objects;
+extern atomic_t fscache_n_cache_culled_objects;
+
+static inline void fscache_stat(atomic_t *stat)
+{
+ atomic_inc(stat);
+}
+
+static inline void fscache_stat_d(atomic_t *stat)
+{
+ atomic_dec(stat);
+}
+
+#define __fscache_stat(stat) (stat)
+
+int fscache_stats_show(struct seq_file *m, void *v);
+#else
+
+#define __fscache_stat(stat) (NULL)
+#define fscache_stat(stat) do {} while (0)
+#define fscache_stat_d(stat) do {} while (0)
+#endif
+
+/*
+ * raise an event on an object
+ * - if the event is not masked for that object, then the object is
+ * queued for attention by the thread pool.
+ */
+static inline void fscache_raise_event(struct fscache_object *object,
+ unsigned event)
+{
+ BUG_ON(event >= NR_FSCACHE_OBJECT_EVENTS);
+#if 0
+ printk("*** fscache_raise_event(OBJ%d{%lx},%x)\n",
+ object->debug_id, object->event_mask, (1 << event));
+#endif
+ if (!test_and_set_bit(event, &object->events) &&
+ test_bit(event, &object->event_mask))
+ fscache_enqueue_object(object);
+}
+
+/*
+ * Update the auxiliary data on a cookie.
+ */
+static inline
+void fscache_update_aux(struct fscache_cookie *cookie, const void *aux_data)
+{
+ void *p;
+
+ if (!aux_data)
+ return;
+ if (cookie->aux_len <= sizeof(cookie->inline_aux))
+ p = cookie->inline_aux;
+ else
+ p = cookie->aux;
+
+ if (memcmp(p, aux_data, cookie->aux_len) != 0) {
+ memcpy(p, aux_data, cookie->aux_len);
+ set_bit(FSCACHE_COOKIE_AUX_UPDATED, &cookie->flags);
+ }
+}
+
+/*****************************************************************************/
+/*
+ * debug tracing
+ */
+#define dbgprintk(FMT, ...) \
+ printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
+
+#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
+
+#define kjournal(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
+
+#ifdef __KDEBUG
+#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
+#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
+#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
+
+#elif defined(CONFIG_FSCACHE_DEBUG)
+#define _enter(FMT, ...) \
+do { \
+ if (__do_kdebug(ENTER)) \
+ kenter(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _leave(FMT, ...) \
+do { \
+ if (__do_kdebug(LEAVE)) \
+ kleave(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _debug(FMT, ...) \
+do { \
+ if (__do_kdebug(DEBUG)) \
+ kdebug(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#else
+#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
+#endif
+
+/*
+ * determine whether a particular optional debugging point should be logged
+ * - we need to go through three steps to persuade cpp to correctly join the
+ * shorthand in FSCACHE_DEBUG_LEVEL with its prefix
+ */
+#define ____do_kdebug(LEVEL, POINT) \
+ unlikely((fscache_debug & \
+ (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
+#define ___do_kdebug(LEVEL, POINT) \
+ ____do_kdebug(LEVEL, POINT)
+#define __do_kdebug(POINT) \
+ ___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
+
+#define FSCACHE_DEBUG_CACHE 0
+#define FSCACHE_DEBUG_COOKIE 1
+#define FSCACHE_DEBUG_PAGE 2
+#define FSCACHE_DEBUG_OPERATION 3
+
+#define FSCACHE_POINT_ENTER 1
+#define FSCACHE_POINT_LEAVE 2
+#define FSCACHE_POINT_DEBUG 4
+
+#ifndef FSCACHE_DEBUG_LEVEL
+#define FSCACHE_DEBUG_LEVEL CACHE
+#endif
+
+/*
+ * assertions
+ */
+#if 1 /* defined(__KDEBUGALL) */
+
+#define ASSERT(X) \
+do { \
+ if (unlikely(!(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+ if (unlikely(!((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIF(C, X) \
+do { \
+ if (unlikely((C) && !(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+ if (unlikely((C) && !((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#else
+
+#define ASSERT(X) do {} while (0)
+#define ASSERTCMP(X, OP, Y) do {} while (0)
+#define ASSERTIF(C, X) do {} while (0)
+#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
+
+#endif /* assert or not */
diff --git a/fs/fscache_old/io.c b/fs/fscache_old/io.c
new file mode 100644
index 000000000000..4443ec957138
--- /dev/null
+++ b/fs/fscache_old/io.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Cache data I/O routines
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL PAGE
+#include <linux/module.h>
+#define FSCACHE_USE_NEW_IO_API
+#define FSCACHE_USE_FALLBACK_IO_API
+#include <linux/fscache_old-cache.h>
+#include <linux/uio.h>
+#include <linux/bvec.h>
+#include <linux/slab.h>
+#include <linux/netfs.h>
+#include "internal.h"
+
+/*
+ * Start a cache operation.
+ * - we return:
+ * -ENOMEM - out of memory, some pages may be being read
+ * -ERESTARTSYS - interrupted, some pages may be being read
+ * -ENOBUFS - no backing object or space available in which to cache any
+ * pages not being read
+ * -ENODATA - no data available in the backing object for some or all of
+ * the pages
+ * 0 - dispatched a read on all pages
+ */
+int __fscache_begin_operation(struct netfs_cache_resources *cres,
+ struct fscache_cookie *cookie,
+ bool for_write)
+{
+ struct fscache_operation *op;
+ struct fscache_object *object;
+ bool wake_cookie = false;
+ int ret;
+
+ _enter("c=%08x", cres->debug_id);
+
+ if (for_write)
+ fscache_stat(&fscache_n_stores);
+ else
+ fscache_stat(&fscache_n_retrievals);
+
+ if (hlist_empty(&cookie->backing_objects))
+ goto nobufs;
+
+ if (test_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags)) {
+ _leave(" = -ENOBUFS [invalidating]");
+ return -ENOBUFS;
+ }
+
+ ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX);
+
+ if (fscache_wait_for_deferred_lookup(cookie) < 0)
+ return -ERESTARTSYS;
+
+ op = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ fscache_operation_init(cookie, op, NULL, NULL, NULL);
+ op->flags = FSCACHE_OP_MYTHREAD |
+ (1UL << FSCACHE_OP_WAITING) |
+ (1UL << FSCACHE_OP_UNUSE_COOKIE);
+
+ trace_fscache_page_op(cookie, NULL, op, fscache_page_op_retr_multi);
+
+ spin_lock(&cookie->lock);
+
+ if (!fscache_cookie_enabled(cookie) ||
+ hlist_empty(&cookie->backing_objects))
+ goto nobufs_unlock;
+ object = hlist_entry(cookie->backing_objects.first,
+ struct fscache_object, cookie_link);
+
+ __fscache_use_cookie(cookie);
+ atomic_inc(&object->n_reads);
+ __set_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags);
+
+ if (fscache_submit_op(object, op) < 0)
+ goto nobufs_unlock_dec;
+ spin_unlock(&cookie->lock);
+
+ /* we wait for the operation to become active, and then process it
+ * *here*, in this thread, and not in the thread pool */
+ if (for_write) {
+ fscache_stat(&fscache_n_store_ops);
+
+ ret = fscache_wait_for_operation_activation(
+ object, op,
+ __fscache_stat(&fscache_n_store_op_waits),
+ __fscache_stat(&fscache_n_stores_object_dead));
+ } else {
+ fscache_stat(&fscache_n_retrieval_ops);
+
+ ret = fscache_wait_for_operation_activation(
+ object, op,
+ __fscache_stat(&fscache_n_retrieval_op_waits),
+ __fscache_stat(&fscache_n_retrievals_object_dead));
+ }
+ if (ret < 0)
+ goto error;
+
+ /* ask the cache to honour the operation */
+ ret = object->cache->ops->begin_operation(cres, op);
+
+error:
+ if (for_write) {
+ if (ret == -ENOMEM)
+ fscache_stat(&fscache_n_stores_oom);
+ else if (ret == -ERESTARTSYS)
+ fscache_stat(&fscache_n_stores_intr);
+ else if (ret < 0)
+ fscache_stat(&fscache_n_stores_nobufs);
+ else
+ fscache_stat(&fscache_n_stores_ok);
+ } else {
+ if (ret == -ENOMEM)
+ fscache_stat(&fscache_n_retrievals_nomem);
+ else if (ret == -ERESTARTSYS)
+ fscache_stat(&fscache_n_retrievals_intr);
+ else if (ret == -ENODATA)
+ fscache_stat(&fscache_n_retrievals_nodata);
+ else if (ret < 0)
+ fscache_stat(&fscache_n_retrievals_nobufs);
+ else
+ fscache_stat(&fscache_n_retrievals_ok);
+ }
+
+ fscache_put_operation(op);
+ _leave(" = %d", ret);
+ return ret;
+
+nobufs_unlock_dec:
+ atomic_dec(&object->n_reads);
+ wake_cookie = __fscache_unuse_cookie(cookie);
+nobufs_unlock:
+ spin_unlock(&cookie->lock);
+ fscache_put_operation(op);
+ if (wake_cookie)
+ __fscache_wake_unused_cookie(cookie);
+nobufs:
+ if (for_write)
+ fscache_stat(&fscache_n_stores_nobufs);
+ else
+ fscache_stat(&fscache_n_retrievals_nobufs);
+ _leave(" = -ENOBUFS");
+ return -ENOBUFS;
+}
+EXPORT_SYMBOL(__fscache_begin_operation);
+
+/*
+ * Clean up an operation.
+ */
+static void fscache_end_operation(struct netfs_cache_resources *cres)
+{
+ cres->ops->end_operation(cres);
+}
+
+/*
+ * Fallback page reading interface.
+ */
+int __fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page)
+{
+ struct netfs_cache_resources cres;
+ struct iov_iter iter;
+ struct bio_vec bvec[1];
+ int ret;
+
+ _enter("%lx", page->index);
+
+ memset(&cres, 0, sizeof(cres));
+ bvec[0].bv_page = page;
+ bvec[0].bv_offset = 0;
+ bvec[0].bv_len = PAGE_SIZE;
+ iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+
+ ret = fscache_begin_read_operation(&cres, cookie);
+ if (ret < 0)
+ return ret;
+
+ ret = fscache_read(&cres, page_offset(page), &iter, NETFS_READ_HOLE_FAIL,
+ NULL, NULL);
+ fscache_end_operation(&cres);
+ _leave(" = %d", ret);
+ return ret;
+}
+EXPORT_SYMBOL(__fscache_fallback_read_page);
+
+/*
+ * Fallback page writing interface.
+ */
+int __fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page)
+{
+ struct netfs_cache_resources cres;
+ struct iov_iter iter;
+ struct bio_vec bvec[1];
+ int ret;
+
+ _enter("%lx", page->index);
+
+ memset(&cres, 0, sizeof(cres));
+ bvec[0].bv_page = page;
+ bvec[0].bv_offset = 0;
+ bvec[0].bv_len = PAGE_SIZE;
+ iov_iter_bvec(&iter, WRITE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+
+ ret = __fscache_begin_operation(&cres, cookie, true);
+ if (ret < 0)
+ return ret;
+
+ ret = cres.ops->prepare_fallback_write(&cres, page_index(page));
+ if (ret < 0)
+ goto out;
+
+ ret = fscache_write(&cres, page_offset(page), &iter, NULL, NULL);
+out:
+ fscache_end_operation(&cres);
+ _leave(" = %d", ret);
+ return ret;
+}
+EXPORT_SYMBOL(__fscache_fallback_write_page);
diff --git a/fs/fscache_old/main.c b/fs/fscache_old/main.c
new file mode 100644
index 000000000000..4207f98e405f
--- /dev/null
+++ b/fs/fscache_old/main.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* General filesystem local caching manager
+ *
+ * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#define CREATE_TRACE_POINTS
+#include "internal.h"
+
+MODULE_DESCRIPTION("FS Cache Manager");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+unsigned fscache_defer_lookup = 1;
+module_param_named(defer_lookup, fscache_defer_lookup, uint,
+ S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(fscache_defer_lookup,
+ "Defer cookie lookup to background thread");
+
+unsigned fscache_defer_create = 1;
+module_param_named(defer_create, fscache_defer_create, uint,
+ S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(fscache_defer_create,
+ "Defer cookie creation to background thread");
+
+unsigned fscache_debug;
+module_param_named(debug, fscache_debug, uint,
+ S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(fscache_debug,
+ "FS-Cache debugging mask");
+
+struct kobject *fscache_root;
+struct workqueue_struct *fscache_object_wq;
+struct workqueue_struct *fscache_op_wq;
+
+DEFINE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
+
+/* these values serve as lower bounds, will be adjusted in fscache_init() */
+static unsigned fscache_object_max_active = 4;
+static unsigned fscache_op_max_active = 2;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table_header *fscache_sysctl_header;
+
+static int fscache_max_active_sysctl(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct workqueue_struct **wqp = table->extra1;
+ unsigned int *datap = table->data;
+ int ret;
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+ if (ret == 0)
+ workqueue_set_max_active(*wqp, *datap);
+ return ret;
+}
+
+static struct ctl_table fscache_sysctls[] = {
+ {
+ .procname = "object_max_active",
+ .data = &fscache_object_max_active,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = fscache_max_active_sysctl,
+ .extra1 = &fscache_object_wq,
+ },
+ {
+ .procname = "operation_max_active",
+ .data = &fscache_op_max_active,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = fscache_max_active_sysctl,
+ .extra1 = &fscache_op_wq,
+ },
+ {}
+};
+
+static struct ctl_table fscache_sysctls_root[] = {
+ {
+ .procname = "fscache",
+ .mode = 0555,
+ .child = fscache_sysctls,
+ },
+ {}
+};
+#endif
+
+/*
+ * Mixing scores (in bits) for (7,20):
+ * Input delta: 1-bit 2-bit
+ * 1 round: 330.3 9201.6
+ * 2 rounds: 1246.4 25475.4
+ * 3 rounds: 1907.1 31295.1
+ * 4 rounds: 2042.3 31718.6
+ * Perfect: 2048 31744
+ * (32*64) (32*31/2 * 64)
+ */
+#define HASH_MIX(x, y, a) \
+ ( x ^= (a), \
+ y ^= x, x = rol32(x, 7),\
+ x += y, y = rol32(y,20),\
+ y *= 9 )
+
+static inline unsigned int fold_hash(unsigned long x, unsigned long y)
+{
+ /* Use arch-optimized multiply if one exists */
+ return __hash_32(y ^ __hash_32(x));
+}
+
+/*
+ * Generate a hash. This is derived from full_name_hash(), but we want to be
+ * sure it is arch independent and that it doesn't change as bits of the
+ * computed hash value might appear on disk. The caller also guarantees that
+ * the hashed data will be a series of aligned 32-bit words.
+ */
+unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n)
+{
+ unsigned int a, x = 0, y = salt;
+
+ for (; n; n--) {
+ a = *data++;
+ HASH_MIX(x, y, a);
+ }
+ return fold_hash(x, y);
+}
+
+/*
+ * initialise the fs caching module
+ */
+static int __init fscache_init(void)
+{
+ unsigned int nr_cpus = num_possible_cpus();
+ unsigned int cpu;
+ int ret;
+
+ fscache_object_max_active =
+ clamp_val(nr_cpus,
+ fscache_object_max_active, WQ_UNBOUND_MAX_ACTIVE);
+
+ ret = -ENOMEM;
+ fscache_object_wq = alloc_workqueue("fscache_object", WQ_UNBOUND,
+ fscache_object_max_active);
+ if (!fscache_object_wq)
+ goto error_object_wq;
+
+ fscache_op_max_active =
+ clamp_val(fscache_object_max_active / 2,
+ fscache_op_max_active, WQ_UNBOUND_MAX_ACTIVE);
+
+ ret = -ENOMEM;
+ fscache_op_wq = alloc_workqueue("fscache_operation", WQ_UNBOUND,
+ fscache_op_max_active);
+ if (!fscache_op_wq)
+ goto error_op_wq;
+
+ for_each_possible_cpu(cpu)
+ init_waitqueue_head(&per_cpu(fscache_object_cong_wait, cpu));
+
+ ret = fscache_proc_init();
+ if (ret < 0)
+ goto error_proc;
+
+#ifdef CONFIG_SYSCTL
+ ret = -ENOMEM;
+ fscache_sysctl_header = register_sysctl_table(fscache_sysctls_root);
+ if (!fscache_sysctl_header)
+ goto error_sysctl;
+#endif
+
+ fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar",
+ sizeof(struct fscache_cookie),
+ 0, 0, NULL);
+ if (!fscache_cookie_jar) {
+ pr_notice("Failed to allocate a cookie jar\n");
+ ret = -ENOMEM;
+ goto error_cookie_jar;
+ }
+
+ fscache_root = kobject_create_and_add("fscache", kernel_kobj);
+ if (!fscache_root)
+ goto error_kobj;
+
+ pr_notice("Loaded\n");
+ return 0;
+
+error_kobj:
+ kmem_cache_destroy(fscache_cookie_jar);
+error_cookie_jar:
+#ifdef CONFIG_SYSCTL
+ unregister_sysctl_table(fscache_sysctl_header);
+error_sysctl:
+#endif
+ fscache_proc_cleanup();
+error_proc:
+ destroy_workqueue(fscache_op_wq);
+error_op_wq:
+ destroy_workqueue(fscache_object_wq);
+error_object_wq:
+ return ret;
+}
+
+fs_initcall(fscache_init);
+
+/*
+ * clean up on module removal
+ */
+static void __exit fscache_exit(void)
+{
+ _enter("");
+
+ kobject_put(fscache_root);
+ kmem_cache_destroy(fscache_cookie_jar);
+#ifdef CONFIG_SYSCTL
+ unregister_sysctl_table(fscache_sysctl_header);
+#endif
+ fscache_proc_cleanup();
+ destroy_workqueue(fscache_op_wq);
+ destroy_workqueue(fscache_object_wq);
+ pr_notice("Unloaded\n");
+}
+
+module_exit(fscache_exit);
diff --git a/fs/fscache_old/netfs.c b/fs/fscache_old/netfs.c
new file mode 100644
index 000000000000..d6bdb7b5e723
--- /dev/null
+++ b/fs/fscache_old/netfs.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache netfs (client) registration
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL COOKIE
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+/*
+ * register a network filesystem for caching
+ */
+int __fscache_register_netfs(struct fscache_netfs *netfs)
+{
+ struct fscache_cookie *candidate, *cookie;
+
+ _enter("{%s}", netfs->name);
+
+ /* allocate a cookie for the primary index */
+ candidate = fscache_alloc_cookie(&fscache_fsdef_index,
+ &fscache_fsdef_netfs_def,
+ netfs->name, strlen(netfs->name),
+ &netfs->version, sizeof(netfs->version),
+ netfs, 0);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ candidate->flags = 1 << FSCACHE_COOKIE_ENABLED;
+
+ /* check the netfs type is not already present */
+ cookie = fscache_hash_cookie(candidate);
+ if (!cookie)
+ goto already_registered;
+ if (cookie != candidate) {
+ trace_fscache_cookie(candidate->debug_id, 1, fscache_cookie_discard);
+ fscache_free_cookie(candidate);
+ }
+
+ fscache_cookie_get(cookie->parent, fscache_cookie_get_register_netfs);
+ atomic_inc(&cookie->parent->n_children);
+
+ netfs->primary_index = cookie;
+
+ pr_notice("Netfs '%s' registered for caching\n", netfs->name);
+ trace_fscache_netfs(netfs);
+ _leave(" = 0");
+ return 0;
+
+already_registered:
+ fscache_cookie_put(candidate, fscache_cookie_put_dup_netfs);
+ _leave(" = -EEXIST");
+ return -EEXIST;
+}
+EXPORT_SYMBOL(__fscache_register_netfs);
+
+/*
+ * unregister a network filesystem from the cache
+ * - all cookies must have been released first
+ */
+void __fscache_unregister_netfs(struct fscache_netfs *netfs)
+{
+ _enter("{%s.%u}", netfs->name, netfs->version);
+
+ fscache_relinquish_cookie(netfs->primary_index, NULL, false);
+ pr_notice("Netfs '%s' unregistered from caching\n", netfs->name);
+
+ _leave("");
+}
+EXPORT_SYMBOL(__fscache_unregister_netfs);
diff --git a/fs/fscache_old/object.c b/fs/fscache_old/object.c
new file mode 100644
index 000000000000..86ad941726f7
--- /dev/null
+++ b/fs/fscache_old/object.c
@@ -0,0 +1,1123 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache object state machine handler
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * See Documentation/filesystems/caching/object.rst for a description of the
+ * object state machine and the in-kernel representations.
+ */
+
+#define FSCACHE_DEBUG_LEVEL COOKIE
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/prefetch.h>
+#include "internal.h"
+
+static const struct fscache_state *fscache_abort_initialisation(struct fscache_object *, int);
+static const struct fscache_state *fscache_kill_dependents(struct fscache_object *, int);
+static const struct fscache_state *fscache_drop_object(struct fscache_object *, int);
+static const struct fscache_state *fscache_initialise_object(struct fscache_object *, int);
+static const struct fscache_state *fscache_invalidate_object(struct fscache_object *, int);
+static const struct fscache_state *fscache_jumpstart_dependents(struct fscache_object *, int);
+static const struct fscache_state *fscache_kill_object(struct fscache_object *, int);
+static const struct fscache_state *fscache_lookup_failure(struct fscache_object *, int);
+static const struct fscache_state *fscache_look_up_object(struct fscache_object *, int);
+static const struct fscache_state *fscache_object_available(struct fscache_object *, int);
+static const struct fscache_state *fscache_parent_ready(struct fscache_object *, int);
+static const struct fscache_state *fscache_update_object(struct fscache_object *, int);
+static const struct fscache_state *fscache_object_dead(struct fscache_object *, int);
+
+#define __STATE_NAME(n) fscache_osm_##n
+#define STATE(n) (&__STATE_NAME(n))
+
+/*
+ * Define a work state. Work states are execution states. No event processing
+ * is performed by them. The function attached to a work state returns a
+ * pointer indicating the next state to which the state machine should
+ * transition. Returning NO_TRANSIT repeats the current state, but goes back
+ * to the scheduler first.
+ */
+#define WORK_STATE(n, sn, f) \
+ const struct fscache_state __STATE_NAME(n) = { \
+ .name = #n, \
+ .short_name = sn, \
+ .work = f \
+ }
+
+/*
+ * Returns from work states.
+ */
+#define transit_to(state) ({ prefetch(&STATE(state)->work); STATE(state); })
+
+#define NO_TRANSIT ((struct fscache_state *)NULL)
+
+/*
+ * Define a wait state. Wait states are event processing states. No execution
+ * is performed by them. Wait states are just tables of "if event X occurs,
+ * clear it and transition to state Y". The dispatcher returns to the
+ * scheduler if none of the events in which the wait state has an interest are
+ * currently pending.
+ */
+#define WAIT_STATE(n, sn, ...) \
+ const struct fscache_state __STATE_NAME(n) = { \
+ .name = #n, \
+ .short_name = sn, \
+ .work = NULL, \
+ .transitions = { __VA_ARGS__, { 0, NULL } } \
+ }
+
+#define TRANSIT_TO(state, emask) \
+ { .events = (emask), .transit_to = STATE(state) }
+
+/*
+ * The object state machine.
+ */
+static WORK_STATE(INIT_OBJECT, "INIT", fscache_initialise_object);
+static WORK_STATE(PARENT_READY, "PRDY", fscache_parent_ready);
+static WORK_STATE(ABORT_INIT, "ABRT", fscache_abort_initialisation);
+static WORK_STATE(LOOK_UP_OBJECT, "LOOK", fscache_look_up_object);
+static WORK_STATE(OBJECT_AVAILABLE, "AVBL", fscache_object_available);
+static WORK_STATE(JUMPSTART_DEPS, "JUMP", fscache_jumpstart_dependents);
+
+static WORK_STATE(INVALIDATE_OBJECT, "INVL", fscache_invalidate_object);
+static WORK_STATE(UPDATE_OBJECT, "UPDT", fscache_update_object);
+
+static WORK_STATE(LOOKUP_FAILURE, "LCFL", fscache_lookup_failure);
+static WORK_STATE(KILL_OBJECT, "KILL", fscache_kill_object);
+static WORK_STATE(KILL_DEPENDENTS, "KDEP", fscache_kill_dependents);
+static WORK_STATE(DROP_OBJECT, "DROP", fscache_drop_object);
+static WORK_STATE(OBJECT_DEAD, "DEAD", fscache_object_dead);
+
+static WAIT_STATE(WAIT_FOR_INIT, "?INI",
+ TRANSIT_TO(INIT_OBJECT, 1 << FSCACHE_OBJECT_EV_NEW_CHILD));
+
+static WAIT_STATE(WAIT_FOR_PARENT, "?PRN",
+ TRANSIT_TO(PARENT_READY, 1 << FSCACHE_OBJECT_EV_PARENT_READY));
+
+static WAIT_STATE(WAIT_FOR_CMD, "?CMD",
+ TRANSIT_TO(INVALIDATE_OBJECT, 1 << FSCACHE_OBJECT_EV_INVALIDATE),
+ TRANSIT_TO(UPDATE_OBJECT, 1 << FSCACHE_OBJECT_EV_UPDATE),
+ TRANSIT_TO(JUMPSTART_DEPS, 1 << FSCACHE_OBJECT_EV_NEW_CHILD));
+
+static WAIT_STATE(WAIT_FOR_CLEARANCE, "?CLR",
+ TRANSIT_TO(KILL_OBJECT, 1 << FSCACHE_OBJECT_EV_CLEARED));
+
+/*
+ * Out-of-band event transition tables. These are for handling unexpected
+ * events, such as an I/O error. If an OOB event occurs, the state machine
+ * clears and disables the event and forces a transition to the nominated work
+ * state (acurrently executing work states will complete first).
+ *
+ * In such a situation, object->state remembers the state the machine should
+ * have been in/gone to and returning NO_TRANSIT returns to that.
+ */
+static const struct fscache_transition fscache_osm_init_oob[] = {
+ TRANSIT_TO(ABORT_INIT,
+ (1 << FSCACHE_OBJECT_EV_ERROR) |
+ (1 << FSCACHE_OBJECT_EV_KILL)),
+ { 0, NULL }
+};
+
+static const struct fscache_transition fscache_osm_lookup_oob[] = {
+ TRANSIT_TO(LOOKUP_FAILURE,
+ (1 << FSCACHE_OBJECT_EV_ERROR) |
+ (1 << FSCACHE_OBJECT_EV_KILL)),
+ { 0, NULL }
+};
+
+static const struct fscache_transition fscache_osm_run_oob[] = {
+ TRANSIT_TO(KILL_OBJECT,
+ (1 << FSCACHE_OBJECT_EV_ERROR) |
+ (1 << FSCACHE_OBJECT_EV_KILL)),
+ { 0, NULL }
+};
+
+static int fscache_get_object(struct fscache_object *,
+ enum fscache_obj_ref_trace);
+static void fscache_put_object(struct fscache_object *,
+ enum fscache_obj_ref_trace);
+static bool fscache_enqueue_dependents(struct fscache_object *, int);
+static void fscache_dequeue_object(struct fscache_object *);
+static void fscache_update_aux_data(struct fscache_object *);
+
+/*
+ * we need to notify the parent when an op completes that we had outstanding
+ * upon it
+ */
+static inline void fscache_done_parent_op(struct fscache_object *object)
+{
+ struct fscache_object *parent = object->parent;
+
+ _enter("OBJ%x {OBJ%x,%x}",
+ object->debug_id, parent->debug_id, parent->n_ops);
+
+ spin_lock_nested(&parent->lock, 1);
+ parent->n_obj_ops--;
+ parent->n_ops--;
+ if (parent->n_ops == 0)
+ fscache_raise_event(parent, FSCACHE_OBJECT_EV_CLEARED);
+ spin_unlock(&parent->lock);
+}
+
+/*
+ * Object state machine dispatcher.
+ */
+static void fscache_object_sm_dispatcher(struct fscache_object *object)
+{
+ const struct fscache_transition *t;
+ const struct fscache_state *state, *new_state;
+ unsigned long events, event_mask;
+ bool oob;
+ int event = -1;
+
+ ASSERT(object != NULL);
+
+ _enter("{OBJ%x,%s,%lx}",
+ object->debug_id, object->state->name, object->events);
+
+ event_mask = object->event_mask;
+restart:
+ object->event_mask = 0; /* Mask normal event handling */
+ state = object->state;
+restart_masked:
+ events = object->events;
+
+ /* Handle any out-of-band events (typically an error) */
+ if (events & object->oob_event_mask) {
+ _debug("{OBJ%x} oob %lx",
+ object->debug_id, events & object->oob_event_mask);
+ oob = true;
+ for (t = object->oob_table; t->events; t++) {
+ if (events & t->events) {
+ state = t->transit_to;
+ ASSERT(state->work != NULL);
+ event = fls(events & t->events) - 1;
+ __clear_bit(event, &object->oob_event_mask);
+ clear_bit(event, &object->events);
+ goto execute_work_state;
+ }
+ }
+ }
+ oob = false;
+
+ /* Wait states are just transition tables */
+ if (!state->work) {
+ if (events & event_mask) {
+ for (t = state->transitions; t->events; t++) {
+ if (events & t->events) {
+ new_state = t->transit_to;
+ event = fls(events & t->events) - 1;
+ trace_fscache_osm(object, state,
+ true, false, event);
+ clear_bit(event, &object->events);
+ _debug("{OBJ%x} ev %d: %s -> %s",
+ object->debug_id, event,
+ state->name, new_state->name);
+ object->state = state = new_state;
+ goto execute_work_state;
+ }
+ }
+
+ /* The event mask didn't include all the tabled bits */
+ BUG();
+ }
+ /* Randomly woke up */
+ goto unmask_events;
+ }
+
+execute_work_state:
+ _debug("{OBJ%x} exec %s", object->debug_id, state->name);
+
+ trace_fscache_osm(object, state, false, oob, event);
+ new_state = state->work(object, event);
+ event = -1;
+ if (new_state == NO_TRANSIT) {
+ _debug("{OBJ%x} %s notrans", object->debug_id, state->name);
+ if (unlikely(state == STATE(OBJECT_DEAD))) {
+ _leave(" [dead]");
+ return;
+ }
+ fscache_enqueue_object(object);
+ event_mask = object->oob_event_mask;
+ goto unmask_events;
+ }
+
+ _debug("{OBJ%x} %s -> %s",
+ object->debug_id, state->name, new_state->name);
+ object->state = state = new_state;
+
+ if (state->work) {
+ if (unlikely(state == STATE(OBJECT_DEAD))) {
+ _leave(" [dead]");
+ return;
+ }
+ goto restart_masked;
+ }
+
+ /* Transited to wait state */
+ event_mask = object->oob_event_mask;
+ for (t = state->transitions; t->events; t++)
+ event_mask |= t->events;
+
+unmask_events:
+ object->event_mask = event_mask;
+ smp_mb();
+ events = object->events;
+ if (events & event_mask)
+ goto restart;
+ _leave(" [msk %lx]", event_mask);
+}
+
+/*
+ * execute an object
+ */
+static void fscache_object_work_func(struct work_struct *work)
+{
+ struct fscache_object *object =
+ container_of(work, struct fscache_object, work);
+
+ _enter("{OBJ%x}", object->debug_id);
+
+ fscache_object_sm_dispatcher(object);
+ fscache_put_object(object, fscache_obj_put_work);
+}
+
+/**
+ * fscache_object_init - Initialise a cache object description
+ * @object: Object description
+ * @cookie: Cookie object will be attached to
+ * @cache: Cache in which backing object will be found
+ *
+ * Initialise a cache object description to its basic values.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+void fscache_object_init(struct fscache_object *object,
+ struct fscache_cookie *cookie,
+ struct fscache_cache *cache)
+{
+ const struct fscache_transition *t;
+
+ atomic_inc(&cache->object_count);
+
+ object->state = STATE(WAIT_FOR_INIT);
+ object->oob_table = fscache_osm_init_oob;
+ object->flags = 1 << FSCACHE_OBJECT_IS_LIVE;
+ spin_lock_init(&object->lock);
+ INIT_LIST_HEAD(&object->cache_link);
+ INIT_HLIST_NODE(&object->cookie_link);
+ INIT_WORK(&object->work, fscache_object_work_func);
+ INIT_LIST_HEAD(&object->dependents);
+ INIT_LIST_HEAD(&object->dep_link);
+ INIT_LIST_HEAD(&object->pending_ops);
+ object->n_children = 0;
+ object->n_ops = object->n_in_progress = object->n_exclusive = 0;
+ object->events = 0;
+ object->store_limit = 0;
+ object->store_limit_l = 0;
+ object->cache = cache;
+ object->cookie = cookie;
+ fscache_cookie_get(cookie, fscache_cookie_get_attach_object);
+ object->parent = NULL;
+#ifdef CONFIG_FSCACHE_OBJECT_LIST
+ RB_CLEAR_NODE(&object->objlist_link);
+#endif
+
+ object->oob_event_mask = 0;
+ for (t = object->oob_table; t->events; t++)
+ object->oob_event_mask |= t->events;
+ object->event_mask = object->oob_event_mask;
+ for (t = object->state->transitions; t->events; t++)
+ object->event_mask |= t->events;
+}
+EXPORT_SYMBOL(fscache_object_init);
+
+/*
+ * Mark the object as no longer being live, making sure that we synchronise
+ * against op submission.
+ */
+static inline void fscache_mark_object_dead(struct fscache_object *object)
+{
+ spin_lock(&object->lock);
+ clear_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
+ spin_unlock(&object->lock);
+}
+
+/*
+ * Abort object initialisation before we start it.
+ */
+static const struct fscache_state *fscache_abort_initialisation(struct fscache_object *object,
+ int event)
+{
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ object->oob_event_mask = 0;
+ fscache_dequeue_object(object);
+ return transit_to(KILL_OBJECT);
+}
+
+/*
+ * initialise an object
+ * - check the specified object's parent to see if we can make use of it
+ * immediately to do a creation
+ * - we may need to start the process of creating a parent and we need to wait
+ * for the parent's lookup and creation to complete if it's not there yet
+ */
+static const struct fscache_state *fscache_initialise_object(struct fscache_object *object,
+ int event)
+{
+ struct fscache_object *parent;
+ bool success;
+
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ ASSERT(list_empty(&object->dep_link));
+
+ parent = object->parent;
+ if (!parent) {
+ _leave(" [no parent]");
+ return transit_to(DROP_OBJECT);
+ }
+
+ _debug("parent: %s of:%lx", parent->state->name, parent->flags);
+
+ if (fscache_object_is_dying(parent)) {
+ _leave(" [bad parent]");
+ return transit_to(DROP_OBJECT);
+ }
+
+ if (fscache_object_is_available(parent)) {
+ _leave(" [ready]");
+ return transit_to(PARENT_READY);
+ }
+
+ _debug("wait");
+
+ spin_lock(&parent->lock);
+ fscache_stat(&fscache_n_cop_grab_object);
+ success = false;
+ if (fscache_object_is_live(parent) &&
+ object->cache->ops->grab_object(object, fscache_obj_get_add_to_deps)) {
+ list_add(&object->dep_link, &parent->dependents);
+ success = true;
+ }
+ fscache_stat_d(&fscache_n_cop_grab_object);
+ spin_unlock(&parent->lock);
+ if (!success) {
+ _leave(" [grab failed]");
+ return transit_to(DROP_OBJECT);
+ }
+
+ /* fscache_acquire_non_index_cookie() uses this
+ * to wake the chain up */
+ fscache_raise_event(parent, FSCACHE_OBJECT_EV_NEW_CHILD);
+ _leave(" [wait]");
+ return transit_to(WAIT_FOR_PARENT);
+}
+
+/*
+ * Once the parent object is ready, we should kick off our lookup op.
+ */
+static const struct fscache_state *fscache_parent_ready(struct fscache_object *object,
+ int event)
+{
+ struct fscache_object *parent = object->parent;
+
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ ASSERT(parent != NULL);
+
+ spin_lock(&parent->lock);
+ parent->n_ops++;
+ parent->n_obj_ops++;
+ spin_unlock(&parent->lock);
+
+ _leave("");
+ return transit_to(LOOK_UP_OBJECT);
+}
+
+/*
+ * look an object up in the cache from which it was allocated
+ * - we hold an "access lock" on the parent object, so the parent object cannot
+ * be withdrawn by either party till we've finished
+ */
+static const struct fscache_state *fscache_look_up_object(struct fscache_object *object,
+ int event)
+{
+ struct fscache_cookie *cookie = object->cookie;
+ struct fscache_object *parent = object->parent;
+ int ret;
+
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ object->oob_table = fscache_osm_lookup_oob;
+
+ ASSERT(parent != NULL);
+ ASSERTCMP(parent->n_ops, >, 0);
+ ASSERTCMP(parent->n_obj_ops, >, 0);
+
+ /* make sure the parent is still available */
+ ASSERT(fscache_object_is_available(parent));
+
+ if (fscache_object_is_dying(parent) ||
+ test_bit(FSCACHE_IOERROR, &object->cache->flags) ||
+ !fscache_use_cookie(object)) {
+ _leave(" [unavailable]");
+ return transit_to(LOOKUP_FAILURE);
+ }
+
+ _debug("LOOKUP \"%s\" in \"%s\"",
+ cookie->def->name, object->cache->tag->name);
+
+ fscache_stat(&fscache_n_object_lookups);
+ fscache_stat(&fscache_n_cop_lookup_object);
+ ret = object->cache->ops->lookup_object(object);
+ fscache_stat_d(&fscache_n_cop_lookup_object);
+
+ fscache_unuse_cookie(object);
+
+ if (ret == -ETIMEDOUT) {
+ /* probably stuck behind another object, so move this one to
+ * the back of the queue */
+ fscache_stat(&fscache_n_object_lookups_timed_out);
+ _leave(" [timeout]");
+ return NO_TRANSIT;
+ }
+
+ if (ret < 0) {
+ _leave(" [error]");
+ return transit_to(LOOKUP_FAILURE);
+ }
+
+ _leave(" [ok]");
+ return transit_to(OBJECT_AVAILABLE);
+}
+
+/**
+ * fscache_object_lookup_negative - Note negative cookie lookup
+ * @object: Object pointing to cookie to mark
+ *
+ * Note negative lookup, permitting those waiting to read data from an already
+ * existing backing object to continue as there's no data for them to read.
+ */
+void fscache_object_lookup_negative(struct fscache_object *object)
+{
+ struct fscache_cookie *cookie = object->cookie;
+
+ _enter("{OBJ%x,%s}", object->debug_id, object->state->name);
+
+ if (!test_and_set_bit(FSCACHE_OBJECT_IS_LOOKED_UP, &object->flags)) {
+ fscache_stat(&fscache_n_object_lookups_negative);
+
+ /* Allow write requests to begin stacking up and read requests to begin
+ * returning ENODATA.
+ */
+ set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
+ clear_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
+
+ clear_bit_unlock(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
+ }
+ _leave("");
+}
+EXPORT_SYMBOL(fscache_object_lookup_negative);
+
+/**
+ * fscache_obtained_object - Note successful object lookup or creation
+ * @object: Object pointing to cookie to mark
+ *
+ * Note successful lookup and/or creation, permitting those waiting to write
+ * data to a backing object to continue.
+ *
+ * Note that after calling this, an object's cookie may be relinquished by the
+ * netfs, and so must be accessed with object lock held.
+ */
+void fscache_obtained_object(struct fscache_object *object)
+{
+ struct fscache_cookie *cookie = object->cookie;
+
+ _enter("{OBJ%x,%s}", object->debug_id, object->state->name);
+
+ /* if we were still looking up, then we must have a positive lookup
+ * result, in which case there may be data available */
+ if (!test_and_set_bit(FSCACHE_OBJECT_IS_LOOKED_UP, &object->flags)) {
+ fscache_stat(&fscache_n_object_lookups_positive);
+
+ /* We do (presumably) have data */
+ clear_bit_unlock(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
+ clear_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
+
+ /* Allow write requests to begin stacking up and read requests
+ * to begin shovelling data.
+ */
+ clear_bit_unlock(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
+ } else {
+ fscache_stat(&fscache_n_object_created);
+ }
+
+ set_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
+ _leave("");
+}
+EXPORT_SYMBOL(fscache_obtained_object);
+
+/*
+ * handle an object that has just become available
+ */
+static const struct fscache_state *fscache_object_available(struct fscache_object *object,
+ int event)
+{
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ object->oob_table = fscache_osm_run_oob;
+
+ spin_lock(&object->lock);
+
+ fscache_done_parent_op(object);
+ if (object->n_in_progress == 0) {
+ if (object->n_ops > 0) {
+ ASSERTCMP(object->n_ops, >=, object->n_obj_ops);
+ fscache_start_operations(object);
+ } else {
+ ASSERT(list_empty(&object->pending_ops));
+ }
+ }
+ spin_unlock(&object->lock);
+
+ fscache_stat(&fscache_n_cop_lookup_complete);
+ object->cache->ops->lookup_complete(object);
+ fscache_stat_d(&fscache_n_cop_lookup_complete);
+
+ fscache_stat(&fscache_n_object_avail);
+
+ _leave("");
+ return transit_to(JUMPSTART_DEPS);
+}
+
+/*
+ * Wake up this object's dependent objects now that we've become available.
+ */
+static const struct fscache_state *fscache_jumpstart_dependents(struct fscache_object *object,
+ int event)
+{
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ if (!fscache_enqueue_dependents(object, FSCACHE_OBJECT_EV_PARENT_READY))
+ return NO_TRANSIT; /* Not finished; requeue */
+ return transit_to(WAIT_FOR_CMD);
+}
+
+/*
+ * Handle lookup or creation failute.
+ */
+static const struct fscache_state *fscache_lookup_failure(struct fscache_object *object,
+ int event)
+{
+ struct fscache_cookie *cookie;
+
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ object->oob_event_mask = 0;
+
+ fscache_stat(&fscache_n_cop_lookup_complete);
+ object->cache->ops->lookup_complete(object);
+ fscache_stat_d(&fscache_n_cop_lookup_complete);
+
+ set_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->flags);
+
+ cookie = object->cookie;
+ set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
+ if (test_and_clear_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags))
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
+
+ fscache_done_parent_op(object);
+ return transit_to(KILL_OBJECT);
+}
+
+/*
+ * Wait for completion of all active operations on this object and the death of
+ * all child objects of this object.
+ */
+static const struct fscache_state *fscache_kill_object(struct fscache_object *object,
+ int event)
+{
+ _enter("{OBJ%x,%d,%d},%d",
+ object->debug_id, object->n_ops, object->n_children, event);
+
+ fscache_mark_object_dead(object);
+ object->oob_event_mask = 0;
+
+ if (test_bit(FSCACHE_OBJECT_RETIRED, &object->flags)) {
+ /* Reject any new read/write ops and abort any that are pending. */
+ clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
+ fscache_cancel_all_ops(object);
+ }
+
+ if (list_empty(&object->dependents) &&
+ object->n_ops == 0 &&
+ object->n_children == 0)
+ return transit_to(DROP_OBJECT);
+
+ if (object->n_in_progress == 0) {
+ spin_lock(&object->lock);
+ if (object->n_ops > 0 && object->n_in_progress == 0)
+ fscache_start_operations(object);
+ spin_unlock(&object->lock);
+ }
+
+ if (!list_empty(&object->dependents))
+ return transit_to(KILL_DEPENDENTS);
+
+ return transit_to(WAIT_FOR_CLEARANCE);
+}
+
+/*
+ * Kill dependent objects.
+ */
+static const struct fscache_state *fscache_kill_dependents(struct fscache_object *object,
+ int event)
+{
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ if (!fscache_enqueue_dependents(object, FSCACHE_OBJECT_EV_KILL))
+ return NO_TRANSIT; /* Not finished */
+ return transit_to(WAIT_FOR_CLEARANCE);
+}
+
+/*
+ * Drop an object's attachments
+ */
+static const struct fscache_state *fscache_drop_object(struct fscache_object *object,
+ int event)
+{
+ struct fscache_object *parent = object->parent;
+ struct fscache_cookie *cookie = object->cookie;
+ struct fscache_cache *cache = object->cache;
+ bool awaken = false;
+
+ _enter("{OBJ%x,%d},%d", object->debug_id, object->n_children, event);
+
+ ASSERT(cookie != NULL);
+ ASSERT(!hlist_unhashed(&object->cookie_link));
+
+ if (test_bit(FSCACHE_COOKIE_AUX_UPDATED, &cookie->flags)) {
+ _debug("final update");
+ fscache_update_aux_data(object);
+ }
+
+ /* Make sure the cookie no longer points here and that the netfs isn't
+ * waiting for us.
+ */
+ spin_lock(&cookie->lock);
+ hlist_del_init(&object->cookie_link);
+ if (hlist_empty(&cookie->backing_objects) &&
+ test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
+ awaken = true;
+ spin_unlock(&cookie->lock);
+
+ if (awaken)
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
+ if (test_and_clear_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags))
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP);
+
+
+ /* Prevent a race with our last child, which has to signal EV_CLEARED
+ * before dropping our spinlock.
+ */
+ spin_lock(&object->lock);
+ spin_unlock(&object->lock);
+
+ /* Discard from the cache's collection of objects */
+ spin_lock(&cache->object_list_lock);
+ list_del_init(&object->cache_link);
+ spin_unlock(&cache->object_list_lock);
+
+ fscache_stat(&fscache_n_cop_drop_object);
+ cache->ops->drop_object(object);
+ fscache_stat_d(&fscache_n_cop_drop_object);
+
+ /* The parent object wants to know when all it dependents have gone */
+ if (parent) {
+ _debug("release parent OBJ%x {%d}",
+ parent->debug_id, parent->n_children);
+
+ spin_lock(&parent->lock);
+ parent->n_children--;
+ if (parent->n_children == 0)
+ fscache_raise_event(parent, FSCACHE_OBJECT_EV_CLEARED);
+ spin_unlock(&parent->lock);
+ object->parent = NULL;
+ }
+
+ /* this just shifts the object release to the work processor */
+ fscache_put_object(object, fscache_obj_put_drop_obj);
+ fscache_stat(&fscache_n_object_dead);
+
+ _leave("");
+ return transit_to(OBJECT_DEAD);
+}
+
+/*
+ * get a ref on an object
+ */
+static int fscache_get_object(struct fscache_object *object,
+ enum fscache_obj_ref_trace why)
+{
+ int ret;
+
+ fscache_stat(&fscache_n_cop_grab_object);
+ ret = object->cache->ops->grab_object(object, why) ? 0 : -EAGAIN;
+ fscache_stat_d(&fscache_n_cop_grab_object);
+ return ret;
+}
+
+/*
+ * Discard a ref on an object
+ */
+static void fscache_put_object(struct fscache_object *object,
+ enum fscache_obj_ref_trace why)
+{
+ fscache_stat(&fscache_n_cop_put_object);
+ object->cache->ops->put_object(object, why);
+ fscache_stat_d(&fscache_n_cop_put_object);
+}
+
+/**
+ * fscache_object_destroy - Note that a cache object is about to be destroyed
+ * @object: The object to be destroyed
+ *
+ * Note the imminent destruction and deallocation of a cache object record.
+ */
+void fscache_object_destroy(struct fscache_object *object)
+{
+ /* We can get rid of the cookie now */
+ fscache_cookie_put(object->cookie, fscache_cookie_put_object);
+ object->cookie = NULL;
+}
+EXPORT_SYMBOL(fscache_object_destroy);
+
+/*
+ * enqueue an object for metadata-type processing
+ */
+void fscache_enqueue_object(struct fscache_object *object)
+{
+ _enter("{OBJ%x}", object->debug_id);
+
+ if (fscache_get_object(object, fscache_obj_get_queue) >= 0) {
+ wait_queue_head_t *cong_wq =
+ &get_cpu_var(fscache_object_cong_wait);
+
+ if (queue_work(fscache_object_wq, &object->work)) {
+ if (fscache_object_congested())
+ wake_up(cong_wq);
+ } else
+ fscache_put_object(object, fscache_obj_put_queue);
+
+ put_cpu_var(fscache_object_cong_wait);
+ }
+}
+
+/**
+ * fscache_object_sleep_till_congested - Sleep until object wq is congested
+ * @timeoutp: Scheduler sleep timeout
+ *
+ * Allow an object handler to sleep until the object workqueue is congested.
+ *
+ * The caller must set up a wake up event before calling this and must have set
+ * the appropriate sleep mode (such as TASK_UNINTERRUPTIBLE) and tested its own
+ * condition before calling this function as no test is made here.
+ *
+ * %true is returned if the object wq is congested, %false otherwise.
+ */
+bool fscache_object_sleep_till_congested(signed long *timeoutp)
+{
+ wait_queue_head_t *cong_wq = this_cpu_ptr(&fscache_object_cong_wait);
+ DEFINE_WAIT(wait);
+
+ if (fscache_object_congested())
+ return true;
+
+ add_wait_queue_exclusive(cong_wq, &wait);
+ if (!fscache_object_congested())
+ *timeoutp = schedule_timeout(*timeoutp);
+ finish_wait(cong_wq, &wait);
+
+ return fscache_object_congested();
+}
+EXPORT_SYMBOL_GPL(fscache_object_sleep_till_congested);
+
+/*
+ * Enqueue the dependents of an object for metadata-type processing.
+ *
+ * If we don't manage to finish the list before the scheduler wants to run
+ * again then return false immediately. We return true if the list was
+ * cleared.
+ */
+static bool fscache_enqueue_dependents(struct fscache_object *object, int event)
+{
+ struct fscache_object *dep;
+ bool ret = true;
+
+ _enter("{OBJ%x}", object->debug_id);
+
+ if (list_empty(&object->dependents))
+ return true;
+
+ spin_lock(&object->lock);
+
+ while (!list_empty(&object->dependents)) {
+ dep = list_entry(object->dependents.next,
+ struct fscache_object, dep_link);
+ list_del_init(&dep->dep_link);
+
+ fscache_raise_event(dep, event);
+ fscache_put_object(dep, fscache_obj_put_enq_dep);
+
+ if (!list_empty(&object->dependents) && need_resched()) {
+ ret = false;
+ break;
+ }
+ }
+
+ spin_unlock(&object->lock);
+ return ret;
+}
+
+/*
+ * remove an object from whatever queue it's waiting on
+ */
+static void fscache_dequeue_object(struct fscache_object *object)
+{
+ _enter("{OBJ%x}", object->debug_id);
+
+ if (!list_empty(&object->dep_link)) {
+ spin_lock(&object->parent->lock);
+ list_del_init(&object->dep_link);
+ spin_unlock(&object->parent->lock);
+ }
+
+ _leave("");
+}
+
+/**
+ * fscache_check_aux - Ask the netfs whether an object on disk is still valid
+ * @object: The object to ask about
+ * @data: The auxiliary data for the object
+ * @datalen: The size of the auxiliary data
+ * @object_size: The size of the object according to the server.
+ *
+ * This function consults the netfs about the coherency state of an object.
+ * The caller must be holding a ref on cookie->n_active (held by
+ * fscache_look_up_object() on behalf of the cache backend during object lookup
+ * and creation).
+ */
+enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
+ const void *data, uint16_t datalen,
+ loff_t object_size)
+{
+ enum fscache_checkaux result;
+
+ if (!object->cookie->def->check_aux) {
+ fscache_stat(&fscache_n_checkaux_none);
+ return FSCACHE_CHECKAUX_OKAY;
+ }
+
+ result = object->cookie->def->check_aux(object->cookie->netfs_data,
+ data, datalen, object_size);
+ switch (result) {
+ /* entry okay as is */
+ case FSCACHE_CHECKAUX_OKAY:
+ fscache_stat(&fscache_n_checkaux_okay);
+ break;
+
+ /* entry requires update */
+ case FSCACHE_CHECKAUX_NEEDS_UPDATE:
+ fscache_stat(&fscache_n_checkaux_update);
+ break;
+
+ /* entry requires deletion */
+ case FSCACHE_CHECKAUX_OBSOLETE:
+ fscache_stat(&fscache_n_checkaux_obsolete);
+ break;
+
+ default:
+ BUG();
+ }
+
+ return result;
+}
+EXPORT_SYMBOL(fscache_check_aux);
+
+/*
+ * Asynchronously invalidate an object.
+ */
+static const struct fscache_state *_fscache_invalidate_object(struct fscache_object *object,
+ int event)
+{
+ struct fscache_operation *op;
+ struct fscache_cookie *cookie = object->cookie;
+
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ /* We're going to need the cookie. If the cookie is not available then
+ * retire the object instead.
+ */
+ if (!fscache_use_cookie(object)) {
+ set_bit(FSCACHE_OBJECT_RETIRED, &object->flags);
+ _leave(" [no cookie]");
+ return transit_to(KILL_OBJECT);
+ }
+
+ /* Reject any new read/write ops and abort any that are pending. */
+ clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
+ fscache_cancel_all_ops(object);
+
+ /* Now we have to wait for in-progress reads and writes */
+ op = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ goto nomem;
+
+ fscache_operation_init(cookie, op, object->cache->ops->invalidate_object,
+ NULL, NULL);
+ op->flags = FSCACHE_OP_ASYNC |
+ (1 << FSCACHE_OP_EXCLUSIVE) |
+ (1 << FSCACHE_OP_UNUSE_COOKIE);
+ trace_fscache_page_op(cookie, NULL, op, fscache_page_op_invalidate);
+
+ spin_lock(&cookie->lock);
+ if (fscache_submit_exclusive_op(object, op) < 0)
+ goto submit_op_failed;
+ spin_unlock(&cookie->lock);
+ fscache_put_operation(op);
+
+ /* Once we've completed the invalidation, we know there will be no data
+ * stored in the cache and thus we can reinstate the data-check-skip
+ * optimisation.
+ */
+ set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
+
+ /* We can allow read and write requests to come in once again. They'll
+ * queue up behind our exclusive invalidation operation.
+ */
+ if (test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
+ wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
+ _leave(" [ok]");
+ return transit_to(UPDATE_OBJECT);
+
+nomem:
+ fscache_mark_object_dead(object);
+ fscache_unuse_cookie(object);
+ _leave(" [ENOMEM]");
+ return transit_to(KILL_OBJECT);
+
+submit_op_failed:
+ fscache_mark_object_dead(object);
+ spin_unlock(&cookie->lock);
+ fscache_unuse_cookie(object);
+ kfree(op);
+ _leave(" [EIO]");
+ return transit_to(KILL_OBJECT);
+}
+
+static const struct fscache_state *fscache_invalidate_object(struct fscache_object *object,
+ int event)
+{
+ const struct fscache_state *s;
+
+ fscache_stat(&fscache_n_invalidates_run);
+ fscache_stat(&fscache_n_cop_invalidate_object);
+ s = _fscache_invalidate_object(object, event);
+ fscache_stat_d(&fscache_n_cop_invalidate_object);
+ return s;
+}
+
+/*
+ * Update auxiliary data.
+ */
+static void fscache_update_aux_data(struct fscache_object *object)
+{
+ fscache_stat(&fscache_n_updates_run);
+ fscache_stat(&fscache_n_cop_update_object);
+ object->cache->ops->update_object(object);
+ fscache_stat_d(&fscache_n_cop_update_object);
+}
+
+/*
+ * Asynchronously update an object.
+ */
+static const struct fscache_state *fscache_update_object(struct fscache_object *object,
+ int event)
+{
+ _enter("{OBJ%x},%d", object->debug_id, event);
+
+ fscache_update_aux_data(object);
+
+ _leave("");
+ return transit_to(WAIT_FOR_CMD);
+}
+
+/**
+ * fscache_object_retrying_stale - Note retrying stale object
+ * @object: The object that will be retried
+ *
+ * Note that an object lookup found an on-disk object that was adjudged to be
+ * stale and has been deleted. The lookup will be retried.
+ */
+void fscache_object_retrying_stale(struct fscache_object *object)
+{
+ fscache_stat(&fscache_n_cache_no_space_reject);
+}
+EXPORT_SYMBOL(fscache_object_retrying_stale);
+
+/**
+ * fscache_object_mark_killed - Note that an object was killed
+ * @object: The object that was culled
+ * @why: The reason the object was killed.
+ *
+ * Note that an object was killed. Returns true if the object was
+ * already marked killed, false if it wasn't.
+ */
+void fscache_object_mark_killed(struct fscache_object *object,
+ enum fscache_why_object_killed why)
+{
+ if (test_and_set_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->flags)) {
+ pr_err("Error: Object already killed by cache [%s]\n",
+ object->cache->identifier);
+ return;
+ }
+
+ switch (why) {
+ case FSCACHE_OBJECT_NO_SPACE:
+ fscache_stat(&fscache_n_cache_no_space_reject);
+ break;
+ case FSCACHE_OBJECT_IS_STALE:
+ fscache_stat(&fscache_n_cache_stale_objects);
+ break;
+ case FSCACHE_OBJECT_WAS_RETIRED:
+ fscache_stat(&fscache_n_cache_retired_objects);
+ break;
+ case FSCACHE_OBJECT_WAS_CULLED:
+ fscache_stat(&fscache_n_cache_culled_objects);
+ break;
+ }
+}
+EXPORT_SYMBOL(fscache_object_mark_killed);
+
+/*
+ * The object is dead. We can get here if an object gets queued by an event
+ * that would lead to its death (such as EV_KILL) when the dispatcher is
+ * already running (and so can be requeued) but hasn't yet cleared the event
+ * mask.
+ */
+static const struct fscache_state *fscache_object_dead(struct fscache_object *object,
+ int event)
+{
+ if (!test_and_set_bit(FSCACHE_OBJECT_RUN_AFTER_DEAD,
+ &object->flags))
+ return NO_TRANSIT;
+
+ WARN(true, "FS-Cache object redispatched after death");
+ return NO_TRANSIT;
+}
diff --git a/fs/fscache_old/operation.c b/fs/fscache_old/operation.c
new file mode 100644
index 000000000000..e002cdfaf3cc
--- /dev/null
+++ b/fs/fscache_old/operation.c
@@ -0,0 +1,633 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache worker operation management routines
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * See Documentation/filesystems/caching/operations.rst
+ */
+
+#define FSCACHE_DEBUG_LEVEL OPERATION
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+atomic_t fscache_op_debug_id;
+EXPORT_SYMBOL(fscache_op_debug_id);
+
+static void fscache_operation_dummy_cancel(struct fscache_operation *op)
+{
+}
+
+/**
+ * fscache_operation_init - Do basic initialisation of an operation
+ * @cookie: The cookie to operate on
+ * @op: The operation to initialise
+ * @processor: The function to perform the operation
+ * @cancel: A function to handle operation cancellation
+ * @release: The release function to assign
+ *
+ * Do basic initialisation of an operation. The caller must still set flags,
+ * object and processor if needed.
+ */
+void fscache_operation_init(struct fscache_cookie *cookie,
+ struct fscache_operation *op,
+ fscache_operation_processor_t processor,
+ fscache_operation_cancel_t cancel,
+ fscache_operation_release_t release)
+{
+ INIT_WORK(&op->work, fscache_op_work_func);
+ atomic_set(&op->usage, 1);
+ op->state = FSCACHE_OP_ST_INITIALISED;
+ op->debug_id = atomic_inc_return(&fscache_op_debug_id);
+ op->processor = processor;
+ op->cancel = cancel ?: fscache_operation_dummy_cancel;
+ op->release = release;
+ INIT_LIST_HEAD(&op->pend_link);
+ fscache_stat(&fscache_n_op_initialised);
+ trace_fscache_op(cookie, op, fscache_op_init);
+}
+EXPORT_SYMBOL(fscache_operation_init);
+
+/**
+ * fscache_enqueue_operation - Enqueue an operation for processing
+ * @op: The operation to enqueue
+ *
+ * Enqueue an operation for processing by the FS-Cache thread pool.
+ *
+ * This will get its own ref on the object.
+ */
+void fscache_enqueue_operation(struct fscache_operation *op)
+{
+ struct fscache_cookie *cookie = op->object->cookie;
+
+ _enter("{OBJ%x OP%x,%u}",
+ op->object->debug_id, op->debug_id, atomic_read(&op->usage));
+
+ ASSERT(list_empty(&op->pend_link));
+ ASSERT(op->processor != NULL);
+ ASSERT(fscache_object_is_available(op->object));
+ ASSERTCMP(atomic_read(&op->usage), >, 0);
+ ASSERTIFCMP(op->state != FSCACHE_OP_ST_IN_PROGRESS,
+ op->state, ==, FSCACHE_OP_ST_CANCELLED);
+
+ fscache_stat(&fscache_n_op_enqueue);
+ switch (op->flags & FSCACHE_OP_TYPE) {
+ case FSCACHE_OP_ASYNC:
+ trace_fscache_op(cookie, op, fscache_op_enqueue_async);
+ _debug("queue async");
+ atomic_inc(&op->usage);
+ if (!queue_work(fscache_op_wq, &op->work))
+ fscache_put_operation(op);
+ break;
+ case FSCACHE_OP_MYTHREAD:
+ trace_fscache_op(cookie, op, fscache_op_enqueue_mythread);
+ _debug("queue for caller's attention");
+ break;
+ default:
+ pr_err("Unexpected op type %lx", op->flags);
+ BUG();
+ break;
+ }
+}
+EXPORT_SYMBOL(fscache_enqueue_operation);
+
+/*
+ * start an op running
+ */
+static void fscache_run_op(struct fscache_object *object,
+ struct fscache_operation *op)
+{
+ ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
+
+ op->state = FSCACHE_OP_ST_IN_PROGRESS;
+ object->n_in_progress++;
+ if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
+ wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
+ if (op->processor)
+ fscache_enqueue_operation(op);
+ else
+ trace_fscache_op(object->cookie, op, fscache_op_run);
+ fscache_stat(&fscache_n_op_run);
+}
+
+/*
+ * report an unexpected submission
+ */
+static void fscache_report_unexpected_submission(struct fscache_object *object,
+ struct fscache_operation *op,
+ const struct fscache_state *ostate)
+{
+ static bool once_only;
+ struct fscache_operation *p;
+ unsigned n;
+
+ if (once_only)
+ return;
+ once_only = true;
+
+ kdebug("unexpected submission OP%x [OBJ%x %s]",
+ op->debug_id, object->debug_id, object->state->name);
+ kdebug("objstate=%s [%s]", object->state->name, ostate->name);
+ kdebug("objflags=%lx", object->flags);
+ kdebug("objevent=%lx [%lx]", object->events, object->event_mask);
+ kdebug("ops=%u inp=%u exc=%u",
+ object->n_ops, object->n_in_progress, object->n_exclusive);
+
+ if (!list_empty(&object->pending_ops)) {
+ n = 0;
+ list_for_each_entry(p, &object->pending_ops, pend_link) {
+ ASSERTCMP(p->object, ==, object);
+ kdebug("%p %p", op->processor, op->release);
+ n++;
+ }
+
+ kdebug("n=%u", n);
+ }
+
+ dump_stack();
+}
+
+/*
+ * submit an exclusive operation for an object
+ * - other ops are excluded from running simultaneously with this one
+ * - this gets any extra refs it needs on an op
+ */
+int fscache_submit_exclusive_op(struct fscache_object *object,
+ struct fscache_operation *op)
+{
+ const struct fscache_state *ostate;
+ unsigned long flags;
+ int ret;
+
+ _enter("{OBJ%x OP%x},", object->debug_id, op->debug_id);
+
+ trace_fscache_op(object->cookie, op, fscache_op_submit_ex);
+
+ ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
+ ASSERTCMP(atomic_read(&op->usage), >, 0);
+
+ spin_lock(&object->lock);
+ ASSERTCMP(object->n_ops, >=, object->n_in_progress);
+ ASSERTCMP(object->n_ops, >=, object->n_exclusive);
+ ASSERT(list_empty(&op->pend_link));
+
+ ostate = object->state;
+ smp_rmb();
+
+ op->state = FSCACHE_OP_ST_PENDING;
+ flags = READ_ONCE(object->flags);
+ if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) {
+ fscache_stat(&fscache_n_op_rejected);
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
+ } else if (unlikely(fscache_cache_is_broken(object))) {
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -EIO;
+ } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) {
+ op->object = object;
+ object->n_ops++;
+ object->n_exclusive++; /* reads and writes must wait */
+
+ if (object->n_in_progress > 0) {
+ atomic_inc(&op->usage);
+ list_add_tail(&op->pend_link, &object->pending_ops);
+ fscache_stat(&fscache_n_op_pend);
+ } else if (!list_empty(&object->pending_ops)) {
+ atomic_inc(&op->usage);
+ list_add_tail(&op->pend_link, &object->pending_ops);
+ fscache_stat(&fscache_n_op_pend);
+ fscache_start_operations(object);
+ } else {
+ ASSERTCMP(object->n_in_progress, ==, 0);
+ fscache_run_op(object, op);
+ }
+
+ /* need to issue a new write op after this */
+ clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
+ ret = 0;
+ } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) {
+ op->object = object;
+ object->n_ops++;
+ object->n_exclusive++; /* reads and writes must wait */
+ atomic_inc(&op->usage);
+ list_add_tail(&op->pend_link, &object->pending_ops);
+ fscache_stat(&fscache_n_op_pend);
+ ret = 0;
+ } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
+ } else {
+ fscache_report_unexpected_submission(object, op, ostate);
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
+ }
+
+ spin_unlock(&object->lock);
+ return ret;
+}
+
+/*
+ * submit an operation for an object
+ * - objects may be submitted only in the following states:
+ * - during object creation (write ops may be submitted)
+ * - whilst the object is active
+ * - after an I/O error incurred in one of the two above states (op rejected)
+ * - this gets any extra refs it needs on an op
+ */
+int fscache_submit_op(struct fscache_object *object,
+ struct fscache_operation *op)
+{
+ const struct fscache_state *ostate;
+ unsigned long flags;
+ int ret;
+
+ _enter("{OBJ%x OP%x},{%u}",
+ object->debug_id, op->debug_id, atomic_read(&op->usage));
+
+ trace_fscache_op(object->cookie, op, fscache_op_submit);
+
+ ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
+ ASSERTCMP(atomic_read(&op->usage), >, 0);
+
+ spin_lock(&object->lock);
+ ASSERTCMP(object->n_ops, >=, object->n_in_progress);
+ ASSERTCMP(object->n_ops, >=, object->n_exclusive);
+ ASSERT(list_empty(&op->pend_link));
+
+ ostate = object->state;
+ smp_rmb();
+
+ op->state = FSCACHE_OP_ST_PENDING;
+ flags = READ_ONCE(object->flags);
+ if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) {
+ fscache_stat(&fscache_n_op_rejected);
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
+ } else if (unlikely(fscache_cache_is_broken(object))) {
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -EIO;
+ } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) {
+ op->object = object;
+ object->n_ops++;
+
+ if (object->n_exclusive > 0) {
+ atomic_inc(&op->usage);
+ list_add_tail(&op->pend_link, &object->pending_ops);
+ fscache_stat(&fscache_n_op_pend);
+ } else if (!list_empty(&object->pending_ops)) {
+ atomic_inc(&op->usage);
+ list_add_tail(&op->pend_link, &object->pending_ops);
+ fscache_stat(&fscache_n_op_pend);
+ fscache_start_operations(object);
+ } else {
+ ASSERTCMP(object->n_exclusive, ==, 0);
+ fscache_run_op(object, op);
+ }
+ ret = 0;
+ } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) {
+ op->object = object;
+ object->n_ops++;
+ atomic_inc(&op->usage);
+ list_add_tail(&op->pend_link, &object->pending_ops);
+ fscache_stat(&fscache_n_op_pend);
+ ret = 0;
+ } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
+ } else {
+ fscache_report_unexpected_submission(object, op, ostate);
+ ASSERT(!fscache_object_is_active(object));
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ ret = -ENOBUFS;
+ }
+
+ spin_unlock(&object->lock);
+ return ret;
+}
+
+/*
+ * queue an object for withdrawal on error, aborting all following asynchronous
+ * operations
+ */
+void fscache_abort_object(struct fscache_object *object)
+{
+ _enter("{OBJ%x}", object->debug_id);
+
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR);
+}
+
+/*
+ * Jump start the operation processing on an object. The caller must hold
+ * object->lock.
+ */
+void fscache_start_operations(struct fscache_object *object)
+{
+ struct fscache_operation *op;
+ bool stop = false;
+
+ while (!list_empty(&object->pending_ops) && !stop) {
+ op = list_entry(object->pending_ops.next,
+ struct fscache_operation, pend_link);
+
+ if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) {
+ if (object->n_in_progress > 0)
+ break;
+ stop = true;
+ }
+ list_del_init(&op->pend_link);
+ fscache_run_op(object, op);
+
+ /* the pending queue was holding a ref on the object */
+ fscache_put_operation(op);
+ }
+
+ ASSERTCMP(object->n_in_progress, <=, object->n_ops);
+
+ _debug("woke %d ops on OBJ%x",
+ object->n_in_progress, object->debug_id);
+}
+
+/*
+ * cancel an operation that's pending on an object
+ */
+int fscache_cancel_op(struct fscache_operation *op,
+ bool cancel_in_progress_op)
+{
+ struct fscache_object *object = op->object;
+ bool put = false;
+ int ret;
+
+ _enter("OBJ%x OP%x}", op->object->debug_id, op->debug_id);
+
+ trace_fscache_op(object->cookie, op, fscache_op_cancel);
+
+ ASSERTCMP(op->state, >=, FSCACHE_OP_ST_PENDING);
+ ASSERTCMP(op->state, !=, FSCACHE_OP_ST_CANCELLED);
+ ASSERTCMP(atomic_read(&op->usage), >, 0);
+
+ spin_lock(&object->lock);
+
+ ret = -EBUSY;
+ if (op->state == FSCACHE_OP_ST_PENDING) {
+ ASSERT(!list_empty(&op->pend_link));
+ list_del_init(&op->pend_link);
+ put = true;
+
+ fscache_stat(&fscache_n_op_cancelled);
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
+ object->n_exclusive--;
+ if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
+ wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
+ ret = 0;
+ } else if (op->state == FSCACHE_OP_ST_IN_PROGRESS && cancel_in_progress_op) {
+ ASSERTCMP(object->n_in_progress, >, 0);
+ if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
+ object->n_exclusive--;
+ object->n_in_progress--;
+ if (object->n_in_progress == 0)
+ fscache_start_operations(object);
+
+ fscache_stat(&fscache_n_op_cancelled);
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
+ object->n_exclusive--;
+ if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
+ wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
+ ret = 0;
+ }
+
+ if (put)
+ fscache_put_operation(op);
+ spin_unlock(&object->lock);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Cancel all pending operations on an object
+ */
+void fscache_cancel_all_ops(struct fscache_object *object)
+{
+ struct fscache_operation *op;
+
+ _enter("OBJ%x", object->debug_id);
+
+ spin_lock(&object->lock);
+
+ while (!list_empty(&object->pending_ops)) {
+ op = list_entry(object->pending_ops.next,
+ struct fscache_operation, pend_link);
+ fscache_stat(&fscache_n_op_cancelled);
+ list_del_init(&op->pend_link);
+
+ trace_fscache_op(object->cookie, op, fscache_op_cancel_all);
+
+ ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
+ op->cancel(op);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+
+ if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
+ object->n_exclusive--;
+ if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
+ wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
+ fscache_put_operation(op);
+ cond_resched_lock(&object->lock);
+ }
+
+ spin_unlock(&object->lock);
+ _leave("");
+}
+
+/*
+ * Record the completion or cancellation of an in-progress operation.
+ */
+void fscache_op_complete(struct fscache_operation *op, bool cancelled)
+{
+ struct fscache_object *object = op->object;
+
+ _enter("OBJ%x", object->debug_id);
+
+ ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS);
+ ASSERTCMP(object->n_in_progress, >, 0);
+ ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags),
+ object->n_exclusive, >, 0);
+ ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags),
+ object->n_in_progress, ==, 1);
+
+ spin_lock(&object->lock);
+
+ if (!cancelled) {
+ trace_fscache_op(object->cookie, op, fscache_op_completed);
+ op->state = FSCACHE_OP_ST_COMPLETE;
+ } else {
+ op->cancel(op);
+ trace_fscache_op(object->cookie, op, fscache_op_cancelled);
+ op->state = FSCACHE_OP_ST_CANCELLED;
+ }
+
+ if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
+ object->n_exclusive--;
+ object->n_in_progress--;
+ if (object->n_in_progress == 0)
+ fscache_start_operations(object);
+
+ spin_unlock(&object->lock);
+ _leave("");
+}
+EXPORT_SYMBOL(fscache_op_complete);
+
+/*
+ * release an operation
+ * - queues pending ops if this is the last in-progress op
+ */
+void fscache_put_operation(struct fscache_operation *op)
+{
+ struct fscache_object *object;
+ struct fscache_cache *cache;
+
+ _enter("{OBJ%x OP%x,%d}",
+ op->object ? op->object->debug_id : 0,
+ op->debug_id, atomic_read(&op->usage));
+
+ ASSERTCMP(atomic_read(&op->usage), >, 0);
+
+ if (!atomic_dec_and_test(&op->usage))
+ return;
+
+ trace_fscache_op(op->object ? op->object->cookie : NULL, op, fscache_op_put);
+
+ _debug("PUT OP");
+ ASSERTIFCMP(op->state != FSCACHE_OP_ST_INITIALISED &&
+ op->state != FSCACHE_OP_ST_COMPLETE,
+ op->state, ==, FSCACHE_OP_ST_CANCELLED);
+
+ fscache_stat(&fscache_n_op_release);
+
+ if (op->release) {
+ op->release(op);
+ op->release = NULL;
+ }
+ op->state = FSCACHE_OP_ST_DEAD;
+
+ object = op->object;
+ if (likely(object)) {
+ if (test_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags))
+ atomic_dec(&object->n_reads);
+ if (test_bit(FSCACHE_OP_UNUSE_COOKIE, &op->flags))
+ fscache_unuse_cookie(object);
+
+ /* now... we may get called with the object spinlock held, so we
+ * complete the cleanup here only if we can immediately acquire the
+ * lock, and defer it otherwise */
+ if (!spin_trylock(&object->lock)) {
+ _debug("defer put");
+ fscache_stat(&fscache_n_op_deferred_release);
+
+ cache = object->cache;
+ spin_lock(&cache->op_gc_list_lock);
+ list_add_tail(&op->pend_link, &cache->op_gc_list);
+ spin_unlock(&cache->op_gc_list_lock);
+ schedule_work(&cache->op_gc);
+ _leave(" [defer]");
+ return;
+ }
+
+ ASSERTCMP(object->n_ops, >, 0);
+ object->n_ops--;
+ if (object->n_ops == 0)
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED);
+
+ spin_unlock(&object->lock);
+ }
+
+ kfree(op);
+ _leave(" [done]");
+}
+EXPORT_SYMBOL(fscache_put_operation);
+
+/*
+ * garbage collect operations that have had their release deferred
+ */
+void fscache_operation_gc(struct work_struct *work)
+{
+ struct fscache_operation *op;
+ struct fscache_object *object;
+ struct fscache_cache *cache =
+ container_of(work, struct fscache_cache, op_gc);
+ int count = 0;
+
+ _enter("");
+
+ do {
+ spin_lock(&cache->op_gc_list_lock);
+ if (list_empty(&cache->op_gc_list)) {
+ spin_unlock(&cache->op_gc_list_lock);
+ break;
+ }
+
+ op = list_entry(cache->op_gc_list.next,
+ struct fscache_operation, pend_link);
+ list_del(&op->pend_link);
+ spin_unlock(&cache->op_gc_list_lock);
+
+ object = op->object;
+ trace_fscache_op(object->cookie, op, fscache_op_gc);
+
+ spin_lock(&object->lock);
+
+ _debug("GC DEFERRED REL OBJ%x OP%x",
+ object->debug_id, op->debug_id);
+ fscache_stat(&fscache_n_op_gc);
+
+ ASSERTCMP(atomic_read(&op->usage), ==, 0);
+ ASSERTCMP(op->state, ==, FSCACHE_OP_ST_DEAD);
+
+ ASSERTCMP(object->n_ops, >, 0);
+ object->n_ops--;
+ if (object->n_ops == 0)
+ fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED);
+
+ spin_unlock(&object->lock);
+ kfree(op);
+
+ } while (count++ < 20);
+
+ if (!list_empty(&cache->op_gc_list))
+ schedule_work(&cache->op_gc);
+
+ _leave("");
+}
+
+/*
+ * execute an operation using fs_op_wq to provide processing context -
+ * the caller holds a ref to this object, so we don't need to hold one
+ */
+void fscache_op_work_func(struct work_struct *work)
+{
+ struct fscache_operation *op =
+ container_of(work, struct fscache_operation, work);
+
+ _enter("{OBJ%x OP%x,%d}",
+ op->object->debug_id, op->debug_id, atomic_read(&op->usage));
+
+ trace_fscache_op(op->object->cookie, op, fscache_op_work);
+
+ ASSERT(op->processor != NULL);
+ op->processor(op);
+ fscache_put_operation(op);
+
+ _leave("");
+}
diff --git a/fs/fscache_old/page.c b/fs/fscache_old/page.c
new file mode 100644
index 000000000000..1d86c8a2a8c4
--- /dev/null
+++ b/fs/fscache_old/page.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Cache page management and data I/O routines
+ *
+ * Copyright (C) 2004-2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL PAGE
+#include <linux/module.h>
+#include <linux/fscache-cache.h>
+#include <linux/buffer_head.h>
+#include <linux/pagevec.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+/*
+ * wait for a deferred lookup to complete
+ */
+int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
+{
+ _enter("");
+
+ if (!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags)) {
+ _leave(" = 0 [imm]");
+ return 0;
+ }
+
+ fscache_stat(&fscache_n_retrievals_wait);
+
+ if (wait_on_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP,
+ TASK_INTERRUPTIBLE) != 0) {
+ fscache_stat(&fscache_n_retrievals_intr);
+ _leave(" = -ERESTARTSYS");
+ return -ERESTARTSYS;
+ }
+
+ ASSERT(!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags));
+
+ smp_rmb();
+ _leave(" = 0 [dly]");
+ return 0;
+}
+
+/*
+ * wait for an object to become active (or dead)
+ */
+int fscache_wait_for_operation_activation(struct fscache_object *object,
+ struct fscache_operation *op,
+ atomic_t *stat_op_waits,
+ atomic_t *stat_object_dead)
+{
+ int ret;
+
+ if (!test_bit(FSCACHE_OP_WAITING, &op->flags))
+ goto check_if_dead;
+
+ _debug(">>> WT");
+ if (stat_op_waits)
+ fscache_stat(stat_op_waits);
+ if (wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
+ TASK_INTERRUPTIBLE) != 0) {
+ trace_fscache_op(object->cookie, op, fscache_op_signal);
+ ret = fscache_cancel_op(op, false);
+ if (ret == 0)
+ return -ERESTARTSYS;
+
+ /* it's been removed from the pending queue by another party,
+ * so we should get to run shortly */
+ wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
+ TASK_UNINTERRUPTIBLE);
+ }
+ _debug("<<< GO");
+
+check_if_dead:
+ if (op->state == FSCACHE_OP_ST_CANCELLED) {
+ if (stat_object_dead)
+ fscache_stat(stat_object_dead);
+ _leave(" = -ENOBUFS [cancelled]");
+ return -ENOBUFS;
+ }
+ if (unlikely(fscache_object_is_dying(object) ||
+ fscache_cache_is_broken(object))) {
+ enum fscache_operation_state state = op->state;
+ trace_fscache_op(object->cookie, op, fscache_op_signal);
+ fscache_cancel_op(op, true);
+ if (stat_object_dead)
+ fscache_stat(stat_object_dead);
+ _leave(" = -ENOBUFS [obj dead %d]", state);
+ return -ENOBUFS;
+ }
+ return 0;
+}
diff --git a/fs/fscache_old/proc.c b/fs/fscache_old/proc.c
new file mode 100644
index 000000000000..061df8f61ffc
--- /dev/null
+++ b/fs/fscache_old/proc.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache statistics viewing interface
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL OPERATION
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include "internal.h"
+
+/*
+ * initialise the /proc/fs/fscache/ directory
+ */
+int __init fscache_proc_init(void)
+{
+ _enter("");
+
+ if (!proc_mkdir("fs/fscache", NULL))
+ goto error_dir;
+
+ if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
+ &fscache_cookies_seq_ops))
+ goto error_cookies;
+
+#ifdef CONFIG_FSCACHE_STATS
+ if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
+ fscache_stats_show))
+ goto error_stats;
+#endif
+
+#ifdef CONFIG_FSCACHE_OBJECT_LIST
+ if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
+ &fscache_objlist_proc_ops))
+ goto error_objects;
+#endif
+
+ _leave(" = 0");
+ return 0;
+
+#ifdef CONFIG_FSCACHE_OBJECT_LIST
+error_objects:
+#endif
+#ifdef CONFIG_FSCACHE_STATS
+ remove_proc_entry("fs/fscache/stats", NULL);
+error_stats:
+#endif
+ remove_proc_entry("fs/fscache/cookies", NULL);
+error_cookies:
+ remove_proc_entry("fs/fscache", NULL);
+error_dir:
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+}
+
+/*
+ * clean up the /proc/fs/fscache/ directory
+ */
+void fscache_proc_cleanup(void)
+{
+#ifdef CONFIG_FSCACHE_OBJECT_LIST
+ remove_proc_entry("fs/fscache/objects", NULL);
+#endif
+#ifdef CONFIG_FSCACHE_STATS
+ remove_proc_entry("fs/fscache/stats", NULL);
+#endif
+ remove_proc_entry("fs/fscache/cookies", NULL);
+ remove_proc_entry("fs/fscache", NULL);
+}
diff --git a/fs/fscache_old/stats.c b/fs/fscache_old/stats.c
new file mode 100644
index 000000000000..2449aa459140
--- /dev/null
+++ b/fs/fscache_old/stats.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache statistics
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL THREAD
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include "internal.h"
+
+/*
+ * operation counters
+ */
+atomic_t fscache_n_op_pend;
+atomic_t fscache_n_op_run;
+atomic_t fscache_n_op_enqueue;
+atomic_t fscache_n_op_deferred_release;
+atomic_t fscache_n_op_initialised;
+atomic_t fscache_n_op_release;
+atomic_t fscache_n_op_gc;
+atomic_t fscache_n_op_cancelled;
+atomic_t fscache_n_op_rejected;
+
+atomic_t fscache_n_attr_changed;
+atomic_t fscache_n_attr_changed_ok;
+atomic_t fscache_n_attr_changed_nobufs;
+atomic_t fscache_n_attr_changed_nomem;
+atomic_t fscache_n_attr_changed_calls;
+
+atomic_t fscache_n_retrievals;
+atomic_t fscache_n_retrievals_ok;
+atomic_t fscache_n_retrievals_wait;
+atomic_t fscache_n_retrievals_nodata;
+atomic_t fscache_n_retrievals_nobufs;
+atomic_t fscache_n_retrievals_intr;
+atomic_t fscache_n_retrievals_nomem;
+atomic_t fscache_n_retrievals_object_dead;
+atomic_t fscache_n_retrieval_ops;
+atomic_t fscache_n_retrieval_op_waits;
+
+atomic_t fscache_n_stores;
+atomic_t fscache_n_stores_ok;
+atomic_t fscache_n_stores_again;
+atomic_t fscache_n_stores_nobufs;
+atomic_t fscache_n_stores_intr;
+atomic_t fscache_n_stores_oom;
+atomic_t fscache_n_store_ops;
+atomic_t fscache_n_stores_object_dead;
+atomic_t fscache_n_store_op_waits;
+
+atomic_t fscache_n_acquires;
+atomic_t fscache_n_acquires_null;
+atomic_t fscache_n_acquires_no_cache;
+atomic_t fscache_n_acquires_ok;
+atomic_t fscache_n_acquires_nobufs;
+atomic_t fscache_n_acquires_oom;
+
+atomic_t fscache_n_invalidates;
+atomic_t fscache_n_invalidates_run;
+
+atomic_t fscache_n_updates;
+atomic_t fscache_n_updates_null;
+atomic_t fscache_n_updates_run;
+
+atomic_t fscache_n_relinquishes;
+atomic_t fscache_n_relinquishes_null;
+atomic_t fscache_n_relinquishes_waitcrt;
+atomic_t fscache_n_relinquishes_retire;
+
+atomic_t fscache_n_cookie_index;
+atomic_t fscache_n_cookie_data;
+atomic_t fscache_n_cookie_special;
+
+atomic_t fscache_n_object_alloc;
+atomic_t fscache_n_object_no_alloc;
+atomic_t fscache_n_object_lookups;
+atomic_t fscache_n_object_lookups_negative;
+atomic_t fscache_n_object_lookups_positive;
+atomic_t fscache_n_object_lookups_timed_out;
+atomic_t fscache_n_object_created;
+atomic_t fscache_n_object_avail;
+atomic_t fscache_n_object_dead;
+
+atomic_t fscache_n_checkaux_none;
+atomic_t fscache_n_checkaux_okay;
+atomic_t fscache_n_checkaux_update;
+atomic_t fscache_n_checkaux_obsolete;
+
+atomic_t fscache_n_cop_alloc_object;
+atomic_t fscache_n_cop_lookup_object;
+atomic_t fscache_n_cop_lookup_complete;
+atomic_t fscache_n_cop_grab_object;
+atomic_t fscache_n_cop_invalidate_object;
+atomic_t fscache_n_cop_update_object;
+atomic_t fscache_n_cop_drop_object;
+atomic_t fscache_n_cop_put_object;
+atomic_t fscache_n_cop_sync_cache;
+atomic_t fscache_n_cop_attr_changed;
+
+atomic_t fscache_n_cache_no_space_reject;
+atomic_t fscache_n_cache_stale_objects;
+atomic_t fscache_n_cache_retired_objects;
+atomic_t fscache_n_cache_culled_objects;
+
+/*
+ * display the general statistics
+ */
+int fscache_stats_show(struct seq_file *m, void *v)
+{
+ seq_puts(m, "FS-Cache statistics\n");
+
+ seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n",
+ atomic_read(&fscache_n_cookie_index),
+ atomic_read(&fscache_n_cookie_data),
+ atomic_read(&fscache_n_cookie_special));
+
+ seq_printf(m, "Objects: alc=%u nal=%u avl=%u ded=%u\n",
+ atomic_read(&fscache_n_object_alloc),
+ atomic_read(&fscache_n_object_no_alloc),
+ atomic_read(&fscache_n_object_avail),
+ atomic_read(&fscache_n_object_dead));
+ seq_printf(m, "ChkAux : non=%u ok=%u upd=%u obs=%u\n",
+ atomic_read(&fscache_n_checkaux_none),
+ atomic_read(&fscache_n_checkaux_okay),
+ atomic_read(&fscache_n_checkaux_update),
+ atomic_read(&fscache_n_checkaux_obsolete));
+
+ seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u nbf=%u"
+ " oom=%u\n",
+ atomic_read(&fscache_n_acquires),
+ atomic_read(&fscache_n_acquires_null),
+ atomic_read(&fscache_n_acquires_no_cache),
+ atomic_read(&fscache_n_acquires_ok),
+ atomic_read(&fscache_n_acquires_nobufs),
+ atomic_read(&fscache_n_acquires_oom));
+
+ seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u tmo=%u\n",
+ atomic_read(&fscache_n_object_lookups),
+ atomic_read(&fscache_n_object_lookups_negative),
+ atomic_read(&fscache_n_object_lookups_positive),
+ atomic_read(&fscache_n_object_created),
+ atomic_read(&fscache_n_object_lookups_timed_out));
+
+ seq_printf(m, "Invals : n=%u run=%u\n",
+ atomic_read(&fscache_n_invalidates),
+ atomic_read(&fscache_n_invalidates_run));
+
+ seq_printf(m, "Updates: n=%u nul=%u run=%u\n",
+ atomic_read(&fscache_n_updates),
+ atomic_read(&fscache_n_updates_null),
+ atomic_read(&fscache_n_updates_run));
+
+ seq_printf(m, "Relinqs: n=%u nul=%u wcr=%u rtr=%u\n",
+ atomic_read(&fscache_n_relinquishes),
+ atomic_read(&fscache_n_relinquishes_null),
+ atomic_read(&fscache_n_relinquishes_waitcrt),
+ atomic_read(&fscache_n_relinquishes_retire));
+
+ seq_printf(m, "AttrChg: n=%u ok=%u nbf=%u oom=%u run=%u\n",
+ atomic_read(&fscache_n_attr_changed),
+ atomic_read(&fscache_n_attr_changed_ok),
+ atomic_read(&fscache_n_attr_changed_nobufs),
+ atomic_read(&fscache_n_attr_changed_nomem),
+ atomic_read(&fscache_n_attr_changed_calls));
+
+ seq_printf(m, "Retrvls: n=%u ok=%u wt=%u nod=%u nbf=%u"
+ " int=%u oom=%u\n",
+ atomic_read(&fscache_n_retrievals),
+ atomic_read(&fscache_n_retrievals_ok),
+ atomic_read(&fscache_n_retrievals_wait),
+ atomic_read(&fscache_n_retrievals_nodata),
+ atomic_read(&fscache_n_retrievals_nobufs),
+ atomic_read(&fscache_n_retrievals_intr),
+ atomic_read(&fscache_n_retrievals_nomem));
+ seq_printf(m, "Retrvls: ops=%u owt=%u abt=%u\n",
+ atomic_read(&fscache_n_retrieval_ops),
+ atomic_read(&fscache_n_retrieval_op_waits),
+ atomic_read(&fscache_n_retrievals_object_dead));
+
+ seq_printf(m, "Stores : n=%u ok=%u agn=%u nbf=%u int=%u oom=%u\n",
+ atomic_read(&fscache_n_stores),
+ atomic_read(&fscache_n_stores_ok),
+ atomic_read(&fscache_n_stores_again),
+ atomic_read(&fscache_n_stores_nobufs),
+ atomic_read(&fscache_n_stores_intr),
+ atomic_read(&fscache_n_stores_oom));
+ seq_printf(m, "Stores : ops=%u owt=%u abt=%u\n",
+ atomic_read(&fscache_n_store_ops),
+ atomic_read(&fscache_n_store_op_waits),
+ atomic_read(&fscache_n_stores_object_dead));
+
+ seq_printf(m, "Ops : pend=%u run=%u enq=%u can=%u rej=%u\n",
+ atomic_read(&fscache_n_op_pend),
+ atomic_read(&fscache_n_op_run),
+ atomic_read(&fscache_n_op_enqueue),
+ atomic_read(&fscache_n_op_cancelled),
+ atomic_read(&fscache_n_op_rejected));
+ seq_printf(m, "Ops : ini=%u dfr=%u rel=%u gc=%u\n",
+ atomic_read(&fscache_n_op_initialised),
+ atomic_read(&fscache_n_op_deferred_release),
+ atomic_read(&fscache_n_op_release),
+ atomic_read(&fscache_n_op_gc));
+
+ seq_printf(m, "CacheOp: alo=%d luo=%d luc=%d gro=%d\n",
+ atomic_read(&fscache_n_cop_alloc_object),
+ atomic_read(&fscache_n_cop_lookup_object),
+ atomic_read(&fscache_n_cop_lookup_complete),
+ atomic_read(&fscache_n_cop_grab_object));
+ seq_printf(m, "CacheOp: inv=%d upo=%d dro=%d pto=%d atc=%d syn=%d\n",
+ atomic_read(&fscache_n_cop_invalidate_object),
+ atomic_read(&fscache_n_cop_update_object),
+ atomic_read(&fscache_n_cop_drop_object),
+ atomic_read(&fscache_n_cop_put_object),
+ atomic_read(&fscache_n_cop_attr_changed),
+ atomic_read(&fscache_n_cop_sync_cache));
+ seq_printf(m, "CacheEv: nsp=%d stl=%d rtr=%d cul=%d\n",
+ atomic_read(&fscache_n_cache_no_space_reject),
+ atomic_read(&fscache_n_cache_stale_objects),
+ atomic_read(&fscache_n_cache_retired_objects),
+ atomic_read(&fscache_n_cache_culled_objects));
+ netfs_stats_show(m);
+ return 0;
+}
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index 679055720dae..a87c51063aa1 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h
@@ -12,7 +12,7 @@
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#define FSCACHE_USE_FALLBACK_IO_API
-#include <linux/fscache.h>
+#include <linux/fscache_old.h>
#ifdef CONFIG_NFS_FSCACHE
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
deleted file mode 100644
index 5e610f9a524c..000000000000
--- a/include/linux/fscache-cache.h
+++ /dev/null
@@ -1,434 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* General filesystem caching backing cache interface
- *
- * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * NOTE!!! See:
- *
- * Documentation/filesystems/caching/backend-api.rst
- *
- * for a description of the cache backend interface declared here.
- */
-
-#ifndef _LINUX_FSCACHE_CACHE_H
-#define _LINUX_FSCACHE_CACHE_H
-
-#include <linux/fscache.h>
-#include <linux/sched.h>
-#include <linux/workqueue.h>
-
-#define NR_MAXCACHES BITS_PER_LONG
-
-struct fscache_cache;
-struct fscache_cache_ops;
-struct fscache_object;
-struct fscache_operation;
-
-enum fscache_obj_ref_trace {
- fscache_obj_get_add_to_deps,
- fscache_obj_get_queue,
- fscache_obj_put_alloc_fail,
- fscache_obj_put_attach_fail,
- fscache_obj_put_drop_obj,
- fscache_obj_put_enq_dep,
- fscache_obj_put_queue,
- fscache_obj_put_work,
- fscache_obj_ref__nr_traces
-};
-
-/*
- * cache tag definition
- */
-struct fscache_cache_tag {
- struct list_head link;
- struct fscache_cache *cache; /* cache referred to by this tag */
- unsigned long flags;
-#define FSCACHE_TAG_RESERVED 0 /* T if tag is reserved for a cache */
- atomic_t usage;
- char name[]; /* tag name */
-};
-
-/*
- * cache definition
- */
-struct fscache_cache {
- const struct fscache_cache_ops *ops;
- struct fscache_cache_tag *tag; /* tag representing this cache */
- struct kobject *kobj; /* system representation of this cache */
- struct list_head link; /* link in list of caches */
- size_t max_index_size; /* maximum size of index data */
- char identifier[36]; /* cache label */
-
- /* node management */
- struct work_struct op_gc; /* operation garbage collector */
- struct list_head object_list; /* list of data/index objects */
- struct list_head op_gc_list; /* list of ops to be deleted */
- spinlock_t object_list_lock;
- spinlock_t op_gc_list_lock;
- atomic_t object_count; /* no. of live objects in this cache */
- struct fscache_object *fsdef; /* object for the fsdef index */
- unsigned long flags;
-#define FSCACHE_IOERROR 0 /* cache stopped on I/O error */
-#define FSCACHE_CACHE_WITHDRAWN 1 /* cache has been withdrawn */
-};
-
-extern wait_queue_head_t fscache_cache_cleared_wq;
-
-/*
- * operation to be applied to a cache object
- * - retrieval initiation operations are done in the context of the process
- * that issued them, and not in an async thread pool
- */
-typedef void (*fscache_operation_release_t)(struct fscache_operation *op);
-typedef void (*fscache_operation_processor_t)(struct fscache_operation *op);
-typedef void (*fscache_operation_cancel_t)(struct fscache_operation *op);
-
-enum fscache_operation_state {
- FSCACHE_OP_ST_BLANK, /* Op is not yet submitted */
- FSCACHE_OP_ST_INITIALISED, /* Op is initialised */
- FSCACHE_OP_ST_PENDING, /* Op is blocked from running */
- FSCACHE_OP_ST_IN_PROGRESS, /* Op is in progress */
- FSCACHE_OP_ST_COMPLETE, /* Op is complete */
- FSCACHE_OP_ST_CANCELLED, /* Op has been cancelled */
- FSCACHE_OP_ST_DEAD /* Op is now dead */
-};
-
-struct fscache_operation {
- struct work_struct work; /* record for async ops */
- struct list_head pend_link; /* link in object->pending_ops */
- struct fscache_object *object; /* object to be operated upon */
-
- unsigned long flags;
-#define FSCACHE_OP_TYPE 0x000f /* operation type */
-#define FSCACHE_OP_ASYNC 0x0001 /* - async op, processor may sleep for disk */
-#define FSCACHE_OP_MYTHREAD 0x0002 /* - processing is done be issuing thread, not pool */
-#define FSCACHE_OP_WAITING 4 /* cleared when op is woken */
-#define FSCACHE_OP_EXCLUSIVE 5 /* exclusive op, other ops must wait */
-#define FSCACHE_OP_DEC_READ_CNT 6 /* decrement object->n_reads on destruction */
-#define FSCACHE_OP_UNUSE_COOKIE 7 /* call fscache_unuse_cookie() on completion */
-#define FSCACHE_OP_KEEP_FLAGS 0x00f0 /* flags to keep when repurposing an op */
-
- enum fscache_operation_state state;
- atomic_t usage;
- unsigned debug_id; /* debugging ID */
-
- /* operation processor callback
- * - can be NULL if FSCACHE_OP_WAITING is going to be used to perform
- * the op in a non-pool thread */
- fscache_operation_processor_t processor;
-
- /* Operation cancellation cleanup (optional) */
- fscache_operation_cancel_t cancel;
-
- /* operation releaser */
- fscache_operation_release_t release;
-};
-
-extern atomic_t fscache_op_debug_id;
-extern void fscache_op_work_func(struct work_struct *work);
-
-extern void fscache_enqueue_operation(struct fscache_operation *);
-extern void fscache_op_complete(struct fscache_operation *, bool);
-extern void fscache_put_operation(struct fscache_operation *);
-extern void fscache_operation_init(struct fscache_cookie *,
- struct fscache_operation *,
- fscache_operation_processor_t,
- fscache_operation_cancel_t,
- fscache_operation_release_t);
-
-/*
- * cache operations
- */
-struct fscache_cache_ops {
- /* name of cache provider */
- const char *name;
-
- /* allocate an object record for a cookie */
- struct fscache_object *(*alloc_object)(struct fscache_cache *cache,
- struct fscache_cookie *cookie);
-
- /* look up the object for a cookie
- * - return -ETIMEDOUT to be requeued
- */
- int (*lookup_object)(struct fscache_object *object);
-
- /* finished looking up */
- void (*lookup_complete)(struct fscache_object *object);
-
- /* increment the usage count on this object (may fail if unmounting) */
- struct fscache_object *(*grab_object)(struct fscache_object *object,
- enum fscache_obj_ref_trace why);
-
- /* pin an object in the cache */
- int (*pin_object)(struct fscache_object *object);
-
- /* unpin an object in the cache */
- void (*unpin_object)(struct fscache_object *object);
-
- /* check the consistency between the backing cache and the FS-Cache
- * cookie */
- int (*check_consistency)(struct fscache_operation *op);
-
- /* store the updated auxiliary data on an object */
- void (*update_object)(struct fscache_object *object);
-
- /* Invalidate an object */
- void (*invalidate_object)(struct fscache_operation *op);
-
- /* discard the resources pinned by an object and effect retirement if
- * necessary */
- void (*drop_object)(struct fscache_object *object);
-
- /* dispose of a reference to an object */
- void (*put_object)(struct fscache_object *object,
- enum fscache_obj_ref_trace why);
-
- /* sync a cache */
- void (*sync_cache)(struct fscache_cache *cache);
-
- /* notification that the attributes of a non-index object (such as
- * i_size) have changed */
- int (*attr_changed)(struct fscache_object *object);
-
- /* reserve space for an object's data and associated metadata */
- int (*reserve_space)(struct fscache_object *object, loff_t i_size);
-
- /* Begin an operation for the netfs lib */
- int (*begin_operation)(struct netfs_cache_resources *cres,
- struct fscache_operation *op);
-};
-
-extern struct fscache_cookie fscache_fsdef_index;
-
-/*
- * Event list for fscache_object::{event_mask,events}
- */
-enum {
- FSCACHE_OBJECT_EV_NEW_CHILD, /* T if object has a new child */
- FSCACHE_OBJECT_EV_PARENT_READY, /* T if object's parent is ready */
- FSCACHE_OBJECT_EV_UPDATE, /* T if object should be updated */
- FSCACHE_OBJECT_EV_INVALIDATE, /* T if cache requested object invalidation */
- FSCACHE_OBJECT_EV_CLEARED, /* T if accessors all gone */
- FSCACHE_OBJECT_EV_ERROR, /* T if fatal error occurred during processing */
- FSCACHE_OBJECT_EV_KILL, /* T if netfs relinquished or cache withdrew object */
- NR_FSCACHE_OBJECT_EVENTS
-};
-
-#define FSCACHE_OBJECT_EVENTS_MASK ((1UL << NR_FSCACHE_OBJECT_EVENTS) - 1)
-
-/*
- * States for object state machine.
- */
-struct fscache_transition {
- unsigned long events;
- const struct fscache_state *transit_to;
-};
-
-struct fscache_state {
- char name[24];
- char short_name[8];
- const struct fscache_state *(*work)(struct fscache_object *object,
- int event);
- const struct fscache_transition transitions[];
-};
-
-/*
- * on-disk cache file or index handle
- */
-struct fscache_object {
- const struct fscache_state *state; /* Object state machine state */
- const struct fscache_transition *oob_table; /* OOB state transition table */
- int debug_id; /* debugging ID */
- int n_children; /* number of child objects */
- int n_ops; /* number of extant ops on object */
- int n_obj_ops; /* number of object ops outstanding on object */
- int n_in_progress; /* number of ops in progress */
- int n_exclusive; /* number of exclusive ops queued or in progress */
- atomic_t n_reads; /* number of read ops in progress */
- spinlock_t lock; /* state and operations lock */
-
- unsigned long lookup_jif; /* time at which lookup started */
- unsigned long oob_event_mask; /* OOB events this object is interested in */
- unsigned long event_mask; /* events this object is interested in */
- unsigned long events; /* events to be processed by this object
- * (order is important - using fls) */
-
- unsigned long flags;
-#define FSCACHE_OBJECT_LOCK 0 /* T if object is busy being processed */
-#define FSCACHE_OBJECT_PENDING_WRITE 1 /* T if object has pending write */
-#define FSCACHE_OBJECT_WAITING 2 /* T if object is waiting on its parent */
-#define FSCACHE_OBJECT_IS_LIVE 3 /* T if object is not withdrawn or relinquished */
-#define FSCACHE_OBJECT_IS_LOOKED_UP 4 /* T if object has been looked up */
-#define FSCACHE_OBJECT_IS_AVAILABLE 5 /* T if object has become active */
-#define FSCACHE_OBJECT_RETIRED 6 /* T if object was retired on relinquishment */
-#define FSCACHE_OBJECT_KILLED_BY_CACHE 7 /* T if object was killed by the cache */
-#define FSCACHE_OBJECT_RUN_AFTER_DEAD 8 /* T if object has been dispatched after death */
-
- struct list_head cache_link; /* link in cache->object_list */
- struct hlist_node cookie_link; /* link in cookie->backing_objects */
- struct fscache_cache *cache; /* cache that supplied this object */
- struct fscache_cookie *cookie; /* netfs's file/index object */
- struct fscache_object *parent; /* parent object */
- struct work_struct work; /* attention scheduling record */
- struct list_head dependents; /* FIFO of dependent objects */
- struct list_head dep_link; /* link in parent's dependents list */
- struct list_head pending_ops; /* unstarted operations on this object */
- pgoff_t store_limit; /* current storage limit */
- loff_t store_limit_l; /* current storage limit */
-};
-
-extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *,
- struct fscache_cache *);
-extern void fscache_object_destroy(struct fscache_object *);
-
-extern void fscache_object_lookup_negative(struct fscache_object *object);
-extern void fscache_obtained_object(struct fscache_object *object);
-
-static inline bool fscache_object_is_live(struct fscache_object *object)
-{
- return test_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
-}
-
-static inline bool fscache_object_is_dying(struct fscache_object *object)
-{
- return !fscache_object_is_live(object);
-}
-
-static inline bool fscache_object_is_available(struct fscache_object *object)
-{
- return test_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
-}
-
-static inline bool fscache_cache_is_broken(struct fscache_object *object)
-{
- return test_bit(FSCACHE_IOERROR, &object->cache->flags);
-}
-
-static inline bool fscache_object_is_active(struct fscache_object *object)
-{
- return fscache_object_is_available(object) &&
- fscache_object_is_live(object) &&
- !fscache_cache_is_broken(object);
-}
-
-/**
- * fscache_object_destroyed - Note destruction of an object in a cache
- * @cache: The cache from which the object came
- *
- * Note the destruction and deallocation of an object record in a cache.
- */
-static inline void fscache_object_destroyed(struct fscache_cache *cache)
-{
- if (atomic_dec_and_test(&cache->object_count))
- wake_up_all(&fscache_cache_cleared_wq);
-}
-
-/**
- * fscache_object_lookup_error - Note an object encountered an error
- * @object: The object on which the error was encountered
- *
- * Note that an object encountered a fatal error (usually an I/O error) and
- * that it should be withdrawn as soon as possible.
- */
-static inline void fscache_object_lookup_error(struct fscache_object *object)
-{
- set_bit(FSCACHE_OBJECT_EV_ERROR, &object->events);
-}
-
-/**
- * fscache_set_store_limit - Set the maximum size to be stored in an object
- * @object: The object to set the maximum on
- * @i_size: The limit to set in bytes
- *
- * Set the maximum size an object is permitted to reach, implying the highest
- * byte that may be written. Intended to be called by the attr_changed() op.
- *
- * See Documentation/filesystems/caching/backend-api.rst for a complete
- * description.
- */
-static inline
-void fscache_set_store_limit(struct fscache_object *object, loff_t i_size)
-{
- object->store_limit_l = i_size;
- object->store_limit = i_size >> PAGE_SHIFT;
- if (i_size & ~PAGE_MASK)
- object->store_limit++;
-}
-
-static inline void __fscache_use_cookie(struct fscache_cookie *cookie)
-{
- atomic_inc(&cookie->n_active);
-}
-
-/**
- * fscache_use_cookie - Request usage of cookie attached to an object
- * @object: Object description
- *
- * Request usage of the cookie attached to an object. NULL is returned if the
- * relinquishment had reduced the cookie usage count to 0.
- */
-static inline bool fscache_use_cookie(struct fscache_object *object)
-{
- struct fscache_cookie *cookie = object->cookie;
- return atomic_inc_not_zero(&cookie->n_active) != 0;
-}
-
-static inline bool __fscache_unuse_cookie(struct fscache_cookie *cookie)
-{
- return atomic_dec_and_test(&cookie->n_active);
-}
-
-static inline void __fscache_wake_unused_cookie(struct fscache_cookie *cookie)
-{
- wake_up_var(&cookie->n_active);
-}
-
-/**
- * fscache_unuse_cookie - Cease usage of cookie attached to an object
- * @object: Object description
- *
- * Cease usage of the cookie attached to an object. When the users count
- * reaches zero then the cookie relinquishment will be permitted to proceed.
- */
-static inline void fscache_unuse_cookie(struct fscache_object *object)
-{
- struct fscache_cookie *cookie = object->cookie;
- if (__fscache_unuse_cookie(cookie))
- __fscache_wake_unused_cookie(cookie);
-}
-
-/*
- * out-of-line cache backend functions
- */
-extern __printf(3, 4)
-void fscache_init_cache(struct fscache_cache *cache,
- const struct fscache_cache_ops *ops,
- const char *idfmt, ...);
-
-extern int fscache_add_cache(struct fscache_cache *cache,
- struct fscache_object *fsdef,
- const char *tagname);
-extern void fscache_withdraw_cache(struct fscache_cache *cache);
-
-extern void fscache_io_error(struct fscache_cache *cache);
-
-extern bool fscache_object_sleep_till_congested(signed long *timeoutp);
-
-extern enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
- const void *data,
- uint16_t datalen,
- loff_t object_size);
-
-extern void fscache_object_retrying_stale(struct fscache_object *object);
-
-enum fscache_why_object_killed {
- FSCACHE_OBJECT_IS_STALE,
- FSCACHE_OBJECT_NO_SPACE,
- FSCACHE_OBJECT_WAS_RETIRED,
- FSCACHE_OBJECT_WAS_CULLED,
-};
-extern void fscache_object_mark_killed(struct fscache_object *object,
- enum fscache_why_object_killed why);
-
-#endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
deleted file mode 100644
index 01558d155799..000000000000
--- a/include/linux/fscache.h
+++ /dev/null
@@ -1,645 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* General filesystem caching interface
- *
- * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * NOTE!!! See:
- *
- * Documentation/filesystems/caching/netfs-api.rst
- *
- * for a description of the network filesystem interface declared here.
- */
-
-#ifndef _LINUX_FSCACHE_H
-#define _LINUX_FSCACHE_H
-
-#include <linux/fs.h>
-#include <linux/list.h>
-#include <linux/pagemap.h>
-#include <linux/pagevec.h>
-#include <linux/list_bl.h>
-#include <linux/netfs.h>
-
-#if defined(CONFIG_FSCACHE) || defined(CONFIG_FSCACHE_MODULE)
-#define fscache_available() (1)
-#define fscache_cookie_valid(cookie) (cookie)
-#define fscache_resources_valid(cres) ((cres)->cache_priv)
-#else
-#define fscache_available() (0)
-#define fscache_cookie_valid(cookie) (0)
-#define fscache_resources_valid(cres) (false)
-#endif
-
-struct pagevec;
-struct fscache_cache_tag;
-struct fscache_cookie;
-struct fscache_netfs;
-struct netfs_read_request;
-
-/* result of index entry consultation */
-enum fscache_checkaux {
- FSCACHE_CHECKAUX_OKAY, /* entry okay as is */
- FSCACHE_CHECKAUX_NEEDS_UPDATE, /* entry requires update */
- FSCACHE_CHECKAUX_OBSOLETE, /* entry requires deletion */
-};
-
-/*
- * fscache cookie definition
- */
-struct fscache_cookie_def {
- /* name of cookie type */
- char name[16];
-
- /* cookie type */
- uint8_t type;
-#define FSCACHE_COOKIE_TYPE_INDEX 0
-#define FSCACHE_COOKIE_TYPE_DATAFILE 1
-
- /* select the cache into which to insert an entry in this index
- * - optional
- * - should return a cache identifier or NULL to cause the cache to be
- * inherited from the parent if possible or the first cache picked
- * for a non-index file if not
- */
- struct fscache_cache_tag *(*select_cache)(
- const void *parent_netfs_data,
- const void *cookie_netfs_data);
-
- /* consult the netfs about the state of an object
- * - this function can be absent if the index carries no state data
- * - the netfs data from the cookie being used as the target is
- * presented, as is the auxiliary data and the object size
- */
- enum fscache_checkaux (*check_aux)(void *cookie_netfs_data,
- const void *data,
- uint16_t datalen,
- loff_t object_size);
-};
-
-/*
- * fscache cached network filesystem type
- * - name, version and ops must be filled in before registration
- * - all other fields will be set during registration
- */
-struct fscache_netfs {
- uint32_t version; /* indexing version */
- const char *name; /* filesystem name */
- struct fscache_cookie *primary_index;
-};
-
-/*
- * data file or index object cookie
- * - a file will only appear in one cache
- * - a request to cache a file may or may not be honoured, subject to
- * constraints such as disk space
- * - indices are created on disk just-in-time
- */
-struct fscache_cookie {
- refcount_t ref; /* number of users of this cookie */
- atomic_t n_children; /* number of children of this cookie */
- atomic_t n_active; /* number of active users of netfs ptrs */
- unsigned int debug_id;
- spinlock_t lock;
- struct hlist_head backing_objects; /* object(s) backing this file/index */
- const struct fscache_cookie_def *def; /* definition */
- struct fscache_cookie *parent; /* parent of this entry */
- struct hlist_bl_node hash_link; /* Link in hash table */
- struct list_head proc_link; /* Link in proc list */
- void *netfs_data; /* back pointer to netfs */
-
- unsigned long flags;
-#define FSCACHE_COOKIE_LOOKING_UP 0 /* T if non-index cookie being looked up still */
-#define FSCACHE_COOKIE_NO_DATA_YET 1 /* T if new object with no cached data yet */
-#define FSCACHE_COOKIE_UNAVAILABLE 2 /* T if cookie is unavailable (error, etc) */
-#define FSCACHE_COOKIE_INVALIDATING 3 /* T if cookie is being invalidated */
-#define FSCACHE_COOKIE_RELINQUISHED 4 /* T if cookie has been relinquished */
-#define FSCACHE_COOKIE_ENABLED 5 /* T if cookie is enabled */
-#define FSCACHE_COOKIE_ENABLEMENT_LOCK 6 /* T if cookie is being en/disabled */
-#define FSCACHE_COOKIE_AUX_UPDATED 8 /* T if the auxiliary data was updated */
-#define FSCACHE_COOKIE_ACQUIRED 9 /* T if cookie is in use */
-#define FSCACHE_COOKIE_RELINQUISHING 10 /* T if cookie is being relinquished */
-
- u8 type; /* Type of object */
- u8 key_len; /* Length of index key */
- u8 aux_len; /* Length of auxiliary data */
- u32 key_hash; /* Hash of parent, type, key, len */
- union {
- void *key; /* Index key */
- u8 inline_key[16]; /* - If the key is short enough */
- };
- union {
- void *aux; /* Auxiliary data */
- u8 inline_aux[8]; /* - If the aux data is short enough */
- };
-};
-
-static inline bool fscache_cookie_enabled(struct fscache_cookie *cookie)
-{
- return (fscache_cookie_valid(cookie) &&
- test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags));
-}
-
-/*
- * slow-path functions for when there is actually caching available, and the
- * netfs does actually have a valid token
- * - these are not to be called directly
- * - these are undefined symbols when FS-Cache is not configured and the
- * optimiser takes care of not using them
- */
-extern int __fscache_register_netfs(struct fscache_netfs *);
-extern void __fscache_unregister_netfs(struct fscache_netfs *);
-extern struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *);
-extern void __fscache_release_cache_tag(struct fscache_cache_tag *);
-
-extern struct fscache_cookie *__fscache_acquire_cookie(
- struct fscache_cookie *,
- const struct fscache_cookie_def *,
- const void *, size_t,
- const void *, size_t,
- void *, loff_t, bool);
-extern void __fscache_relinquish_cookie(struct fscache_cookie *, const void *, bool);
-extern int __fscache_check_consistency(struct fscache_cookie *, const void *);
-extern void __fscache_update_cookie(struct fscache_cookie *, const void *);
-extern int __fscache_attr_changed(struct fscache_cookie *);
-extern void __fscache_invalidate(struct fscache_cookie *);
-extern void __fscache_wait_on_invalidate(struct fscache_cookie *);
-#ifdef FSCACHE_USE_NEW_IO_API
-extern int __fscache_begin_operation(struct netfs_cache_resources *, struct fscache_cookie *,
- bool);
-#endif
-#ifdef FSCACHE_USE_FALLBACK_IO_API
-extern int __fscache_fallback_read_page(struct fscache_cookie *, struct page *);
-extern int __fscache_fallback_write_page(struct fscache_cookie *, struct page *);
-#endif
-extern void __fscache_disable_cookie(struct fscache_cookie *, const void *, bool);
-extern void __fscache_enable_cookie(struct fscache_cookie *, const void *, loff_t,
- bool (*)(void *), void *);
-
-/**
- * fscache_register_netfs - Register a filesystem as desiring caching services
- * @netfs: The description of the filesystem
- *
- * Register a filesystem as desiring caching services if they're available.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-int fscache_register_netfs(struct fscache_netfs *netfs)
-{
- if (fscache_available())
- return __fscache_register_netfs(netfs);
- else
- return 0;
-}
-
-/**
- * fscache_unregister_netfs - Indicate that a filesystem no longer desires
- * caching services
- * @netfs: The description of the filesystem
- *
- * Indicate that a filesystem no longer desires caching services for the
- * moment.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-void fscache_unregister_netfs(struct fscache_netfs *netfs)
-{
- if (fscache_available())
- __fscache_unregister_netfs(netfs);
-}
-
-/**
- * fscache_lookup_cache_tag - Look up a cache tag
- * @name: The name of the tag to search for
- *
- * Acquire a specific cache referral tag that can be used to select a specific
- * cache in which to cache an index.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-struct fscache_cache_tag *fscache_lookup_cache_tag(const char *name)
-{
- if (fscache_available())
- return __fscache_lookup_cache_tag(name);
- else
- return NULL;
-}
-
-/**
- * fscache_release_cache_tag - Release a cache tag
- * @tag: The tag to release
- *
- * Release a reference to a cache referral tag previously looked up.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-void fscache_release_cache_tag(struct fscache_cache_tag *tag)
-{
- if (fscache_available())
- __fscache_release_cache_tag(tag);
-}
-
-/**
- * fscache_acquire_cookie - Acquire a cookie to represent a cache object
- * @parent: The cookie that's to be the parent of this one
- * @def: A description of the cache object, including callback operations
- * @index_key: The index key for this cookie
- * @index_key_len: Size of the index key
- * @aux_data: The auxiliary data for the cookie (may be NULL)
- * @aux_data_len: Size of the auxiliary data buffer
- * @netfs_data: An arbitrary piece of data to be kept in the cookie to
- * represent the cache object to the netfs
- * @object_size: The initial size of object
- * @enable: Whether or not to enable a data cookie immediately
- *
- * This function is used to inform FS-Cache about part of an index hierarchy
- * that can be used to locate files. This is done by requesting a cookie for
- * each index in the path to the file.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-struct fscache_cookie *fscache_acquire_cookie(
- struct fscache_cookie *parent,
- const struct fscache_cookie_def *def,
- const void *index_key,
- size_t index_key_len,
- const void *aux_data,
- size_t aux_data_len,
- void *netfs_data,
- loff_t object_size,
- bool enable)
-{
- if (fscache_cookie_valid(parent) && fscache_cookie_enabled(parent))
- return __fscache_acquire_cookie(parent, def,
- index_key, index_key_len,
- aux_data, aux_data_len,
- netfs_data, object_size, enable);
- else
- return NULL;
-}
-
-/**
- * fscache_relinquish_cookie - Return the cookie to the cache, maybe discarding
- * it
- * @cookie: The cookie being returned
- * @aux_data: The updated auxiliary data for the cookie (may be NULL)
- * @retire: True if the cache object the cookie represents is to be discarded
- *
- * This function returns a cookie to the cache, forcibly discarding the
- * associated cache object if retire is set to true. The opportunity is
- * provided to update the auxiliary data in the cache before the object is
- * disconnected.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-void fscache_relinquish_cookie(struct fscache_cookie *cookie,
- const void *aux_data,
- bool retire)
-{
- if (fscache_cookie_valid(cookie))
- __fscache_relinquish_cookie(cookie, aux_data, retire);
-}
-
-/**
- * fscache_check_consistency - Request validation of a cache's auxiliary data
- * @cookie: The cookie representing the cache object
- * @aux_data: The updated auxiliary data for the cookie (may be NULL)
- *
- * Request an consistency check from fscache, which passes the request to the
- * backing cache. The auxiliary data on the cookie will be updated first if
- * @aux_data is set.
- *
- * Returns 0 if consistent and -ESTALE if inconsistent. May also
- * return -ENOMEM and -ERESTARTSYS.
- */
-static inline
-int fscache_check_consistency(struct fscache_cookie *cookie,
- const void *aux_data)
-{
- if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
- return __fscache_check_consistency(cookie, aux_data);
- else
- return 0;
-}
-
-/**
- * fscache_update_cookie - Request that a cache object be updated
- * @cookie: The cookie representing the cache object
- * @aux_data: The updated auxiliary data for the cookie (may be NULL)
- *
- * Request an update of the index data for the cache object associated with the
- * cookie. The auxiliary data on the cookie will be updated first if @aux_data
- * is set.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-void fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data)
-{
- if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
- __fscache_update_cookie(cookie, aux_data);
-}
-
-/**
- * fscache_pin_cookie - Pin a data-storage cache object in its cache
- * @cookie: The cookie representing the cache object
- *
- * Permit data-storage cache objects to be pinned in the cache.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-int fscache_pin_cookie(struct fscache_cookie *cookie)
-{
- return -ENOBUFS;
-}
-
-/**
- * fscache_pin_cookie - Unpin a data-storage cache object in its cache
- * @cookie: The cookie representing the cache object
- *
- * Permit data-storage cache objects to be unpinned from the cache.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-void fscache_unpin_cookie(struct fscache_cookie *cookie)
-{
-}
-
-/**
- * fscache_attr_changed - Notify cache that an object's attributes changed
- * @cookie: The cookie representing the cache object
- *
- * Send a notification to the cache indicating that an object's attributes have
- * changed. This includes the data size. These attributes will be obtained
- * through the get_attr() cookie definition op.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-int fscache_attr_changed(struct fscache_cookie *cookie)
-{
- if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
- return __fscache_attr_changed(cookie);
- else
- return -ENOBUFS;
-}
-
-/**
- * fscache_invalidate - Notify cache that an object needs invalidation
- * @cookie: The cookie representing the cache object
- *
- * Notify the cache that an object is needs to be invalidated and that it
- * should abort any retrievals or stores it is doing on the cache. The object
- * is then marked non-caching until such time as the invalidation is complete.
- *
- * This can be called with spinlocks held.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-void fscache_invalidate(struct fscache_cookie *cookie)
-{
- if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
- __fscache_invalidate(cookie);
-}
-
-/**
- * fscache_wait_on_invalidate - Wait for invalidation to complete
- * @cookie: The cookie representing the cache object
- *
- * Wait for the invalidation of an object to complete.
- *
- * See Documentation/filesystems/caching/netfs-api.rst for a complete
- * description.
- */
-static inline
-void fscache_wait_on_invalidate(struct fscache_cookie *cookie)
-{
- if (fscache_cookie_valid(cookie))
- __fscache_wait_on_invalidate(cookie);
-}
-
-#ifdef FSCACHE_USE_NEW_IO_API
-
-/**
- * fscache_begin_read_operation - Begin a read operation for the netfs lib
- * @cres: The cache resources for the read being performed
- * @cookie: The cookie representing the cache object
- *
- * Begin a read operation on behalf of the netfs helper library. @cres
- * indicates the cache resources to which the operation state should be
- * attached; @cookie indicates the cache object that will be accessed.
- *
- * This is intended to be called from the ->begin_cache_operation() netfs lib
- * operation as implemented by the network filesystem.
- *
- * Returns:
- * * 0 - Success
- * * -ENOBUFS - No caching available
- * * Other error code from the cache, such as -ENOMEM.
- */
-static inline
-int fscache_begin_read_operation(struct netfs_cache_resources *cres,
- struct fscache_cookie *cookie)
-{
- if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
- return __fscache_begin_operation(cres, cookie, false);
- return -ENOBUFS;
-}
-
-/**
- * fscache_operation_valid - Return true if operations resources are usable
- * @cres: The resources to check.
- *
- * Returns a pointer to the operations table if usable or NULL if not.
- */
-static inline
-const struct netfs_cache_ops *fscache_operation_valid(const struct netfs_cache_resources *cres)
-{
- return fscache_resources_valid(cres) ? cres->ops : NULL;
-}
-
-/**
- * fscache_read - Start a read from the cache.
- * @cres: The cache resources to use
- * @start_pos: The beginning file offset in the cache file
- * @iter: The buffer to fill - and also the length
- * @read_hole: How to handle a hole in the data.
- * @term_func: The function to call upon completion
- * @term_func_priv: The private data for @term_func
- *
- * Start a read from the cache. @cres indicates the cache object to read from
- * and must be obtained by a call to fscache_begin_operation() beforehand.
- *
- * The data is read into the iterator, @iter, and that also indicates the size
- * of the operation. @start_pos is the start position in the file, though if
- * @seek_data is set appropriately, the cache can use SEEK_DATA to find the
- * next piece of data, writing zeros for the hole into the iterator.
- *
- * Upon termination of the operation, @term_func will be called and supplied
- * with @term_func_priv plus the amount of data written, if successful, or the
- * error code otherwise.
- */
-static inline
-int fscache_read(struct netfs_cache_resources *cres,
- loff_t start_pos,
- struct iov_iter *iter,
- enum netfs_read_from_hole read_hole,
- netfs_io_terminated_t term_func,
- void *term_func_priv)
-{
- const struct netfs_cache_ops *ops = fscache_operation_valid(cres);
- return ops->read(cres, start_pos, iter, read_hole,
- term_func, term_func_priv);
-}
-
-/**
- * fscache_write - Start a write to the cache.
- * @cres: The cache resources to use
- * @start_pos: The beginning file offset in the cache file
- * @iter: The data to write - and also the length
- * @term_func: The function to call upon completion
- * @term_func_priv: The private data for @term_func
- *
- * Start a write to the cache. @cres indicates the cache object to write to and
- * must be obtained by a call to fscache_begin_operation() beforehand.
- *
- * The data to be written is obtained from the iterator, @iter, and that also
- * indicates the size of the operation. @start_pos is the start position in
- * the file.
- *
- * Upon termination of the operation, @term_func will be called and supplied
- * with @term_func_priv plus the amount of data written, if successful, or the
- * error code otherwise.
- */
-static inline
-int fscache_write(struct netfs_cache_resources *cres,
- loff_t start_pos,
- struct iov_iter *iter,
- netfs_io_terminated_t term_func,
- void *term_func_priv)
-{
- const struct netfs_cache_ops *ops = fscache_operation_valid(cres);
- return ops->write(cres, start_pos, iter, term_func, term_func_priv);
-}
-
-#endif /* FSCACHE_USE_NEW_IO_API */
-
-/**
- * fscache_disable_cookie - Disable a cookie
- * @cookie: The cookie representing the cache object
- * @aux_data: The updated auxiliary data for the cookie (may be NULL)
- * @invalidate: Invalidate the backing object
- *
- * Disable a cookie from accepting further alloc, read, write, invalidate,
- * update or acquire operations. Outstanding operations can still be waited
- * upon and pages can still be uncached and the cookie relinquished.
- *
- * This will not return until all outstanding operations have completed.
- *
- * If @invalidate is set, then the backing object will be invalidated and
- * detached, otherwise it will just be detached.
- *
- * If @aux_data is set, then auxiliary data will be updated from that.
- */
-static inline
-void fscache_disable_cookie(struct fscache_cookie *cookie,
- const void *aux_data,
- bool invalidate)
-{
- if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
- __fscache_disable_cookie(cookie, aux_data, invalidate);
-}
-
-/**
- * fscache_enable_cookie - Reenable a cookie
- * @cookie: The cookie representing the cache object
- * @aux_data: The updated auxiliary data for the cookie (may be NULL)
- * @object_size: Current size of object
- * @can_enable: A function to permit enablement once lock is held
- * @data: Data for can_enable()
- *
- * Reenable a previously disabled cookie, allowing it to accept further alloc,
- * read, write, invalidate, update or acquire operations. An attempt will be
- * made to immediately reattach the cookie to a backing object. If @aux_data
- * is set, the auxiliary data attached to the cookie will be updated.
- *
- * The can_enable() function is called (if not NULL) once the enablement lock
- * is held to rule on whether enablement is still permitted to go ahead.
- */
-static inline
-void fscache_enable_cookie(struct fscache_cookie *cookie,
- const void *aux_data,
- loff_t object_size,
- bool (*can_enable)(void *data),
- void *data)
-{
- if (fscache_cookie_valid(cookie) && !fscache_cookie_enabled(cookie))
- __fscache_enable_cookie(cookie, aux_data, object_size,
- can_enable, data);
-}
-
-#ifdef FSCACHE_USE_FALLBACK_IO_API
-
-/**
- * fscache_fallback_read_page - Read a page from a cache object (DANGEROUS)
- * @cookie: The cookie representing the cache object
- * @page: The page to be read to
- *
- * Synchronously read a page from the cache. The page's offset is used to
- * indicate where to read.
- *
- * This is dangerous and should be moved away from as it relies on the
- * assumption that the backing filesystem will exactly record the blocks we
- * have stored there.
- */
-static inline
-int fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page)
-{
- if (fscache_cookie_enabled(cookie))
- return __fscache_fallback_read_page(cookie, page);
- return -ENOBUFS;
-}
-
-/**
- * fscache_fallback_write_page - Write a page to a cache object (DANGEROUS)
- * @cookie: The cookie representing the cache object
- * @page: The page to be written from
- *
- * Synchronously write a page to the cache. The page's offset is used to
- * indicate where to write.
- *
- * This is dangerous and should be moved away from as it relies on the
- * assumption that the backing filesystem will exactly record the blocks we
- * have stored there.
- */
-static inline
-int fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page)
-{
- if (fscache_cookie_enabled(cookie))
- return __fscache_fallback_write_page(cookie, page);
- return -ENOBUFS;
-}
-
-#endif /* FSCACHE_USE_FALLBACK_IO_API */
-
-#endif /* _LINUX_FSCACHE_H */
diff --git a/include/linux/fscache_old-cache.h b/include/linux/fscache_old-cache.h
new file mode 100644
index 000000000000..39ccd7eff62e
--- /dev/null
+++ b/include/linux/fscache_old-cache.h
@@ -0,0 +1,434 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* General filesystem caching backing cache interface
+ *
+ * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * NOTE!!! See:
+ *
+ * Documentation/filesystems/caching/backend-api.rst
+ *
+ * for a description of the cache backend interface declared here.
+ */
+
+#ifndef _LINUX_FSCACHE_CACHE_H
+#define _LINUX_FSCACHE_CACHE_H
+
+#include <linux/fscache_old.h>
+#include <linux/sched.h>
+#include <linux/workqueue.h>
+
+#define NR_MAXCACHES BITS_PER_LONG
+
+struct fscache_cache;
+struct fscache_cache_ops;
+struct fscache_object;
+struct fscache_operation;
+
+enum fscache_obj_ref_trace {
+ fscache_obj_get_add_to_deps,
+ fscache_obj_get_queue,
+ fscache_obj_put_alloc_fail,
+ fscache_obj_put_attach_fail,
+ fscache_obj_put_drop_obj,
+ fscache_obj_put_enq_dep,
+ fscache_obj_put_queue,
+ fscache_obj_put_work,
+ fscache_obj_ref__nr_traces
+};
+
+/*
+ * cache tag definition
+ */
+struct fscache_cache_tag {
+ struct list_head link;
+ struct fscache_cache *cache; /* cache referred to by this tag */
+ unsigned long flags;
+#define FSCACHE_TAG_RESERVED 0 /* T if tag is reserved for a cache */
+ atomic_t usage;
+ char name[]; /* tag name */
+};
+
+/*
+ * cache definition
+ */
+struct fscache_cache {
+ const struct fscache_cache_ops *ops;
+ struct fscache_cache_tag *tag; /* tag representing this cache */
+ struct kobject *kobj; /* system representation of this cache */
+ struct list_head link; /* link in list of caches */
+ size_t max_index_size; /* maximum size of index data */
+ char identifier[36]; /* cache label */
+
+ /* node management */
+ struct work_struct op_gc; /* operation garbage collector */
+ struct list_head object_list; /* list of data/index objects */
+ struct list_head op_gc_list; /* list of ops to be deleted */
+ spinlock_t object_list_lock;
+ spinlock_t op_gc_list_lock;
+ atomic_t object_count; /* no. of live objects in this cache */
+ struct fscache_object *fsdef; /* object for the fsdef index */
+ unsigned long flags;
+#define FSCACHE_IOERROR 0 /* cache stopped on I/O error */
+#define FSCACHE_CACHE_WITHDRAWN 1 /* cache has been withdrawn */
+};
+
+extern wait_queue_head_t fscache_cache_cleared_wq;
+
+/*
+ * operation to be applied to a cache object
+ * - retrieval initiation operations are done in the context of the process
+ * that issued them, and not in an async thread pool
+ */
+typedef void (*fscache_operation_release_t)(struct fscache_operation *op);
+typedef void (*fscache_operation_processor_t)(struct fscache_operation *op);
+typedef void (*fscache_operation_cancel_t)(struct fscache_operation *op);
+
+enum fscache_operation_state {
+ FSCACHE_OP_ST_BLANK, /* Op is not yet submitted */
+ FSCACHE_OP_ST_INITIALISED, /* Op is initialised */
+ FSCACHE_OP_ST_PENDING, /* Op is blocked from running */
+ FSCACHE_OP_ST_IN_PROGRESS, /* Op is in progress */
+ FSCACHE_OP_ST_COMPLETE, /* Op is complete */
+ FSCACHE_OP_ST_CANCELLED, /* Op has been cancelled */
+ FSCACHE_OP_ST_DEAD /* Op is now dead */
+};
+
+struct fscache_operation {
+ struct work_struct work; /* record for async ops */
+ struct list_head pend_link; /* link in object->pending_ops */
+ struct fscache_object *object; /* object to be operated upon */
+
+ unsigned long flags;
+#define FSCACHE_OP_TYPE 0x000f /* operation type */
+#define FSCACHE_OP_ASYNC 0x0001 /* - async op, processor may sleep for disk */
+#define FSCACHE_OP_MYTHREAD 0x0002 /* - processing is done be issuing thread, not pool */
+#define FSCACHE_OP_WAITING 4 /* cleared when op is woken */
+#define FSCACHE_OP_EXCLUSIVE 5 /* exclusive op, other ops must wait */
+#define FSCACHE_OP_DEC_READ_CNT 6 /* decrement object->n_reads on destruction */
+#define FSCACHE_OP_UNUSE_COOKIE 7 /* call fscache_unuse_cookie() on completion */
+#define FSCACHE_OP_KEEP_FLAGS 0x00f0 /* flags to keep when repurposing an op */
+
+ enum fscache_operation_state state;
+ atomic_t usage;
+ unsigned debug_id; /* debugging ID */
+
+ /* operation processor callback
+ * - can be NULL if FSCACHE_OP_WAITING is going to be used to perform
+ * the op in a non-pool thread */
+ fscache_operation_processor_t processor;
+
+ /* Operation cancellation cleanup (optional) */
+ fscache_operation_cancel_t cancel;
+
+ /* operation releaser */
+ fscache_operation_release_t release;
+};
+
+extern atomic_t fscache_op_debug_id;
+extern void fscache_op_work_func(struct work_struct *work);
+
+extern void fscache_enqueue_operation(struct fscache_operation *);
+extern void fscache_op_complete(struct fscache_operation *, bool);
+extern void fscache_put_operation(struct fscache_operation *);
+extern void fscache_operation_init(struct fscache_cookie *,
+ struct fscache_operation *,
+ fscache_operation_processor_t,
+ fscache_operation_cancel_t,
+ fscache_operation_release_t);
+
+/*
+ * cache operations
+ */
+struct fscache_cache_ops {
+ /* name of cache provider */
+ const char *name;
+
+ /* allocate an object record for a cookie */
+ struct fscache_object *(*alloc_object)(struct fscache_cache *cache,
+ struct fscache_cookie *cookie);
+
+ /* look up the object for a cookie
+ * - return -ETIMEDOUT to be requeued
+ */
+ int (*lookup_object)(struct fscache_object *object);
+
+ /* finished looking up */
+ void (*lookup_complete)(struct fscache_object *object);
+
+ /* increment the usage count on this object (may fail if unmounting) */
+ struct fscache_object *(*grab_object)(struct fscache_object *object,
+ enum fscache_obj_ref_trace why);
+
+ /* pin an object in the cache */
+ int (*pin_object)(struct fscache_object *object);
+
+ /* unpin an object in the cache */
+ void (*unpin_object)(struct fscache_object *object);
+
+ /* check the consistency between the backing cache and the FS-Cache
+ * cookie */
+ int (*check_consistency)(struct fscache_operation *op);
+
+ /* store the updated auxiliary data on an object */
+ void (*update_object)(struct fscache_object *object);
+
+ /* Invalidate an object */
+ void (*invalidate_object)(struct fscache_operation *op);
+
+ /* discard the resources pinned by an object and effect retirement if
+ * necessary */
+ void (*drop_object)(struct fscache_object *object);
+
+ /* dispose of a reference to an object */
+ void (*put_object)(struct fscache_object *object,
+ enum fscache_obj_ref_trace why);
+
+ /* sync a cache */
+ void (*sync_cache)(struct fscache_cache *cache);
+
+ /* notification that the attributes of a non-index object (such as
+ * i_size) have changed */
+ int (*attr_changed)(struct fscache_object *object);
+
+ /* reserve space for an object's data and associated metadata */
+ int (*reserve_space)(struct fscache_object *object, loff_t i_size);
+
+ /* Begin an operation for the netfs lib */
+ int (*begin_operation)(struct netfs_cache_resources *cres,
+ struct fscache_operation *op);
+};
+
+extern struct fscache_cookie fscache_fsdef_index;
+
+/*
+ * Event list for fscache_object::{event_mask,events}
+ */
+enum {
+ FSCACHE_OBJECT_EV_NEW_CHILD, /* T if object has a new child */
+ FSCACHE_OBJECT_EV_PARENT_READY, /* T if object's parent is ready */
+ FSCACHE_OBJECT_EV_UPDATE, /* T if object should be updated */
+ FSCACHE_OBJECT_EV_INVALIDATE, /* T if cache requested object invalidation */
+ FSCACHE_OBJECT_EV_CLEARED, /* T if accessors all gone */
+ FSCACHE_OBJECT_EV_ERROR, /* T if fatal error occurred during processing */
+ FSCACHE_OBJECT_EV_KILL, /* T if netfs relinquished or cache withdrew object */
+ NR_FSCACHE_OBJECT_EVENTS
+};
+
+#define FSCACHE_OBJECT_EVENTS_MASK ((1UL << NR_FSCACHE_OBJECT_EVENTS) - 1)
+
+/*
+ * States for object state machine.
+ */
+struct fscache_transition {
+ unsigned long events;
+ const struct fscache_state *transit_to;
+};
+
+struct fscache_state {
+ char name[24];
+ char short_name[8];
+ const struct fscache_state *(*work)(struct fscache_object *object,
+ int event);
+ const struct fscache_transition transitions[];
+};
+
+/*
+ * on-disk cache file or index handle
+ */
+struct fscache_object {
+ const struct fscache_state *state; /* Object state machine state */
+ const struct fscache_transition *oob_table; /* OOB state transition table */
+ int debug_id; /* debugging ID */
+ int n_children; /* number of child objects */
+ int n_ops; /* number of extant ops on object */
+ int n_obj_ops; /* number of object ops outstanding on object */
+ int n_in_progress; /* number of ops in progress */
+ int n_exclusive; /* number of exclusive ops queued or in progress */
+ atomic_t n_reads; /* number of read ops in progress */
+ spinlock_t lock; /* state and operations lock */
+
+ unsigned long lookup_jif; /* time at which lookup started */
+ unsigned long oob_event_mask; /* OOB events this object is interested in */
+ unsigned long event_mask; /* events this object is interested in */
+ unsigned long events; /* events to be processed by this object
+ * (order is important - using fls) */
+
+ unsigned long flags;
+#define FSCACHE_OBJECT_LOCK 0 /* T if object is busy being processed */
+#define FSCACHE_OBJECT_PENDING_WRITE 1 /* T if object has pending write */
+#define FSCACHE_OBJECT_WAITING 2 /* T if object is waiting on its parent */
+#define FSCACHE_OBJECT_IS_LIVE 3 /* T if object is not withdrawn or relinquished */
+#define FSCACHE_OBJECT_IS_LOOKED_UP 4 /* T if object has been looked up */
+#define FSCACHE_OBJECT_IS_AVAILABLE 5 /* T if object has become active */
+#define FSCACHE_OBJECT_RETIRED 6 /* T if object was retired on relinquishment */
+#define FSCACHE_OBJECT_KILLED_BY_CACHE 7 /* T if object was killed by the cache */
+#define FSCACHE_OBJECT_RUN_AFTER_DEAD 8 /* T if object has been dispatched after death */
+
+ struct list_head cache_link; /* link in cache->object_list */
+ struct hlist_node cookie_link; /* link in cookie->backing_objects */
+ struct fscache_cache *cache; /* cache that supplied this object */
+ struct fscache_cookie *cookie; /* netfs's file/index object */
+ struct fscache_object *parent; /* parent object */
+ struct work_struct work; /* attention scheduling record */
+ struct list_head dependents; /* FIFO of dependent objects */
+ struct list_head dep_link; /* link in parent's dependents list */
+ struct list_head pending_ops; /* unstarted operations on this object */
+ pgoff_t store_limit; /* current storage limit */
+ loff_t store_limit_l; /* current storage limit */
+};
+
+extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *,
+ struct fscache_cache *);
+extern void fscache_object_destroy(struct fscache_object *);
+
+extern void fscache_object_lookup_negative(struct fscache_object *object);
+extern void fscache_obtained_object(struct fscache_object *object);
+
+static inline bool fscache_object_is_live(struct fscache_object *object)
+{
+ return test_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
+}
+
+static inline bool fscache_object_is_dying(struct fscache_object *object)
+{
+ return !fscache_object_is_live(object);
+}
+
+static inline bool fscache_object_is_available(struct fscache_object *object)
+{
+ return test_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
+}
+
+static inline bool fscache_cache_is_broken(struct fscache_object *object)
+{
+ return test_bit(FSCACHE_IOERROR, &object->cache->flags);
+}
+
+static inline bool fscache_object_is_active(struct fscache_object *object)
+{
+ return fscache_object_is_available(object) &&
+ fscache_object_is_live(object) &&
+ !fscache_cache_is_broken(object);
+}
+
+/**
+ * fscache_object_destroyed - Note destruction of an object in a cache
+ * @cache: The cache from which the object came
+ *
+ * Note the destruction and deallocation of an object record in a cache.
+ */
+static inline void fscache_object_destroyed(struct fscache_cache *cache)
+{
+ if (atomic_dec_and_test(&cache->object_count))
+ wake_up_all(&fscache_cache_cleared_wq);
+}
+
+/**
+ * fscache_object_lookup_error - Note an object encountered an error
+ * @object: The object on which the error was encountered
+ *
+ * Note that an object encountered a fatal error (usually an I/O error) and
+ * that it should be withdrawn as soon as possible.
+ */
+static inline void fscache_object_lookup_error(struct fscache_object *object)
+{
+ set_bit(FSCACHE_OBJECT_EV_ERROR, &object->events);
+}
+
+/**
+ * fscache_set_store_limit - Set the maximum size to be stored in an object
+ * @object: The object to set the maximum on
+ * @i_size: The limit to set in bytes
+ *
+ * Set the maximum size an object is permitted to reach, implying the highest
+ * byte that may be written. Intended to be called by the attr_changed() op.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_set_store_limit(struct fscache_object *object, loff_t i_size)
+{
+ object->store_limit_l = i_size;
+ object->store_limit = i_size >> PAGE_SHIFT;
+ if (i_size & ~PAGE_MASK)
+ object->store_limit++;
+}
+
+static inline void __fscache_use_cookie(struct fscache_cookie *cookie)
+{
+ atomic_inc(&cookie->n_active);
+}
+
+/**
+ * fscache_use_cookie - Request usage of cookie attached to an object
+ * @object: Object description
+ *
+ * Request usage of the cookie attached to an object. NULL is returned if the
+ * relinquishment had reduced the cookie usage count to 0.
+ */
+static inline bool fscache_use_cookie(struct fscache_object *object)
+{
+ struct fscache_cookie *cookie = object->cookie;
+ return atomic_inc_not_zero(&cookie->n_active) != 0;
+}
+
+static inline bool __fscache_unuse_cookie(struct fscache_cookie *cookie)
+{
+ return atomic_dec_and_test(&cookie->n_active);
+}
+
+static inline void __fscache_wake_unused_cookie(struct fscache_cookie *cookie)
+{
+ wake_up_var(&cookie->n_active);
+}
+
+/**
+ * fscache_unuse_cookie - Cease usage of cookie attached to an object
+ * @object: Object description
+ *
+ * Cease usage of the cookie attached to an object. When the users count
+ * reaches zero then the cookie relinquishment will be permitted to proceed.
+ */
+static inline void fscache_unuse_cookie(struct fscache_object *object)
+{
+ struct fscache_cookie *cookie = object->cookie;
+ if (__fscache_unuse_cookie(cookie))
+ __fscache_wake_unused_cookie(cookie);
+}
+
+/*
+ * out-of-line cache backend functions
+ */
+extern __printf(3, 4)
+void fscache_init_cache(struct fscache_cache *cache,
+ const struct fscache_cache_ops *ops,
+ const char *idfmt, ...);
+
+extern int fscache_add_cache(struct fscache_cache *cache,
+ struct fscache_object *fsdef,
+ const char *tagname);
+extern void fscache_withdraw_cache(struct fscache_cache *cache);
+
+extern void fscache_io_error(struct fscache_cache *cache);
+
+extern bool fscache_object_sleep_till_congested(signed long *timeoutp);
+
+extern enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
+ const void *data,
+ uint16_t datalen,
+ loff_t object_size);
+
+extern void fscache_object_retrying_stale(struct fscache_object *object);
+
+enum fscache_why_object_killed {
+ FSCACHE_OBJECT_IS_STALE,
+ FSCACHE_OBJECT_NO_SPACE,
+ FSCACHE_OBJECT_WAS_RETIRED,
+ FSCACHE_OBJECT_WAS_CULLED,
+};
+extern void fscache_object_mark_killed(struct fscache_object *object,
+ enum fscache_why_object_killed why);
+
+#endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/linux/fscache_old.h b/include/linux/fscache_old.h
new file mode 100644
index 000000000000..01558d155799
--- /dev/null
+++ b/include/linux/fscache_old.h
@@ -0,0 +1,645 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* General filesystem caching interface
+ *
+ * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * NOTE!!! See:
+ *
+ * Documentation/filesystems/caching/netfs-api.rst
+ *
+ * for a description of the network filesystem interface declared here.
+ */
+
+#ifndef _LINUX_FSCACHE_H
+#define _LINUX_FSCACHE_H
+
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/pagemap.h>
+#include <linux/pagevec.h>
+#include <linux/list_bl.h>
+#include <linux/netfs.h>
+
+#if defined(CONFIG_FSCACHE) || defined(CONFIG_FSCACHE_MODULE)
+#define fscache_available() (1)
+#define fscache_cookie_valid(cookie) (cookie)
+#define fscache_resources_valid(cres) ((cres)->cache_priv)
+#else
+#define fscache_available() (0)
+#define fscache_cookie_valid(cookie) (0)
+#define fscache_resources_valid(cres) (false)
+#endif
+
+struct pagevec;
+struct fscache_cache_tag;
+struct fscache_cookie;
+struct fscache_netfs;
+struct netfs_read_request;
+
+/* result of index entry consultation */
+enum fscache_checkaux {
+ FSCACHE_CHECKAUX_OKAY, /* entry okay as is */
+ FSCACHE_CHECKAUX_NEEDS_UPDATE, /* entry requires update */
+ FSCACHE_CHECKAUX_OBSOLETE, /* entry requires deletion */
+};
+
+/*
+ * fscache cookie definition
+ */
+struct fscache_cookie_def {
+ /* name of cookie type */
+ char name[16];
+
+ /* cookie type */
+ uint8_t type;
+#define FSCACHE_COOKIE_TYPE_INDEX 0
+#define FSCACHE_COOKIE_TYPE_DATAFILE 1
+
+ /* select the cache into which to insert an entry in this index
+ * - optional
+ * - should return a cache identifier or NULL to cause the cache to be
+ * inherited from the parent if possible or the first cache picked
+ * for a non-index file if not
+ */
+ struct fscache_cache_tag *(*select_cache)(
+ const void *parent_netfs_data,
+ const void *cookie_netfs_data);
+
+ /* consult the netfs about the state of an object
+ * - this function can be absent if the index carries no state data
+ * - the netfs data from the cookie being used as the target is
+ * presented, as is the auxiliary data and the object size
+ */
+ enum fscache_checkaux (*check_aux)(void *cookie_netfs_data,
+ const void *data,
+ uint16_t datalen,
+ loff_t object_size);
+};
+
+/*
+ * fscache cached network filesystem type
+ * - name, version and ops must be filled in before registration
+ * - all other fields will be set during registration
+ */
+struct fscache_netfs {
+ uint32_t version; /* indexing version */
+ const char *name; /* filesystem name */
+ struct fscache_cookie *primary_index;
+};
+
+/*
+ * data file or index object cookie
+ * - a file will only appear in one cache
+ * - a request to cache a file may or may not be honoured, subject to
+ * constraints such as disk space
+ * - indices are created on disk just-in-time
+ */
+struct fscache_cookie {
+ refcount_t ref; /* number of users of this cookie */
+ atomic_t n_children; /* number of children of this cookie */
+ atomic_t n_active; /* number of active users of netfs ptrs */
+ unsigned int debug_id;
+ spinlock_t lock;
+ struct hlist_head backing_objects; /* object(s) backing this file/index */
+ const struct fscache_cookie_def *def; /* definition */
+ struct fscache_cookie *parent; /* parent of this entry */
+ struct hlist_bl_node hash_link; /* Link in hash table */
+ struct list_head proc_link; /* Link in proc list */
+ void *netfs_data; /* back pointer to netfs */
+
+ unsigned long flags;
+#define FSCACHE_COOKIE_LOOKING_UP 0 /* T if non-index cookie being looked up still */
+#define FSCACHE_COOKIE_NO_DATA_YET 1 /* T if new object with no cached data yet */
+#define FSCACHE_COOKIE_UNAVAILABLE 2 /* T if cookie is unavailable (error, etc) */
+#define FSCACHE_COOKIE_INVALIDATING 3 /* T if cookie is being invalidated */
+#define FSCACHE_COOKIE_RELINQUISHED 4 /* T if cookie has been relinquished */
+#define FSCACHE_COOKIE_ENABLED 5 /* T if cookie is enabled */
+#define FSCACHE_COOKIE_ENABLEMENT_LOCK 6 /* T if cookie is being en/disabled */
+#define FSCACHE_COOKIE_AUX_UPDATED 8 /* T if the auxiliary data was updated */
+#define FSCACHE_COOKIE_ACQUIRED 9 /* T if cookie is in use */
+#define FSCACHE_COOKIE_RELINQUISHING 10 /* T if cookie is being relinquished */
+
+ u8 type; /* Type of object */
+ u8 key_len; /* Length of index key */
+ u8 aux_len; /* Length of auxiliary data */
+ u32 key_hash; /* Hash of parent, type, key, len */
+ union {
+ void *key; /* Index key */
+ u8 inline_key[16]; /* - If the key is short enough */
+ };
+ union {
+ void *aux; /* Auxiliary data */
+ u8 inline_aux[8]; /* - If the aux data is short enough */
+ };
+};
+
+static inline bool fscache_cookie_enabled(struct fscache_cookie *cookie)
+{
+ return (fscache_cookie_valid(cookie) &&
+ test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags));
+}
+
+/*
+ * slow-path functions for when there is actually caching available, and the
+ * netfs does actually have a valid token
+ * - these are not to be called directly
+ * - these are undefined symbols when FS-Cache is not configured and the
+ * optimiser takes care of not using them
+ */
+extern int __fscache_register_netfs(struct fscache_netfs *);
+extern void __fscache_unregister_netfs(struct fscache_netfs *);
+extern struct fscache_cache_tag *__fscache_lookup_cache_tag(const char *);
+extern void __fscache_release_cache_tag(struct fscache_cache_tag *);
+
+extern struct fscache_cookie *__fscache_acquire_cookie(
+ struct fscache_cookie *,
+ const struct fscache_cookie_def *,
+ const void *, size_t,
+ const void *, size_t,
+ void *, loff_t, bool);
+extern void __fscache_relinquish_cookie(struct fscache_cookie *, const void *, bool);
+extern int __fscache_check_consistency(struct fscache_cookie *, const void *);
+extern void __fscache_update_cookie(struct fscache_cookie *, const void *);
+extern int __fscache_attr_changed(struct fscache_cookie *);
+extern void __fscache_invalidate(struct fscache_cookie *);
+extern void __fscache_wait_on_invalidate(struct fscache_cookie *);
+#ifdef FSCACHE_USE_NEW_IO_API
+extern int __fscache_begin_operation(struct netfs_cache_resources *, struct fscache_cookie *,
+ bool);
+#endif
+#ifdef FSCACHE_USE_FALLBACK_IO_API
+extern int __fscache_fallback_read_page(struct fscache_cookie *, struct page *);
+extern int __fscache_fallback_write_page(struct fscache_cookie *, struct page *);
+#endif
+extern void __fscache_disable_cookie(struct fscache_cookie *, const void *, bool);
+extern void __fscache_enable_cookie(struct fscache_cookie *, const void *, loff_t,
+ bool (*)(void *), void *);
+
+/**
+ * fscache_register_netfs - Register a filesystem as desiring caching services
+ * @netfs: The description of the filesystem
+ *
+ * Register a filesystem as desiring caching services if they're available.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+int fscache_register_netfs(struct fscache_netfs *netfs)
+{
+ if (fscache_available())
+ return __fscache_register_netfs(netfs);
+ else
+ return 0;
+}
+
+/**
+ * fscache_unregister_netfs - Indicate that a filesystem no longer desires
+ * caching services
+ * @netfs: The description of the filesystem
+ *
+ * Indicate that a filesystem no longer desires caching services for the
+ * moment.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_unregister_netfs(struct fscache_netfs *netfs)
+{
+ if (fscache_available())
+ __fscache_unregister_netfs(netfs);
+}
+
+/**
+ * fscache_lookup_cache_tag - Look up a cache tag
+ * @name: The name of the tag to search for
+ *
+ * Acquire a specific cache referral tag that can be used to select a specific
+ * cache in which to cache an index.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+struct fscache_cache_tag *fscache_lookup_cache_tag(const char *name)
+{
+ if (fscache_available())
+ return __fscache_lookup_cache_tag(name);
+ else
+ return NULL;
+}
+
+/**
+ * fscache_release_cache_tag - Release a cache tag
+ * @tag: The tag to release
+ *
+ * Release a reference to a cache referral tag previously looked up.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_release_cache_tag(struct fscache_cache_tag *tag)
+{
+ if (fscache_available())
+ __fscache_release_cache_tag(tag);
+}
+
+/**
+ * fscache_acquire_cookie - Acquire a cookie to represent a cache object
+ * @parent: The cookie that's to be the parent of this one
+ * @def: A description of the cache object, including callback operations
+ * @index_key: The index key for this cookie
+ * @index_key_len: Size of the index key
+ * @aux_data: The auxiliary data for the cookie (may be NULL)
+ * @aux_data_len: Size of the auxiliary data buffer
+ * @netfs_data: An arbitrary piece of data to be kept in the cookie to
+ * represent the cache object to the netfs
+ * @object_size: The initial size of object
+ * @enable: Whether or not to enable a data cookie immediately
+ *
+ * This function is used to inform FS-Cache about part of an index hierarchy
+ * that can be used to locate files. This is done by requesting a cookie for
+ * each index in the path to the file.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+struct fscache_cookie *fscache_acquire_cookie(
+ struct fscache_cookie *parent,
+ const struct fscache_cookie_def *def,
+ const void *index_key,
+ size_t index_key_len,
+ const void *aux_data,
+ size_t aux_data_len,
+ void *netfs_data,
+ loff_t object_size,
+ bool enable)
+{
+ if (fscache_cookie_valid(parent) && fscache_cookie_enabled(parent))
+ return __fscache_acquire_cookie(parent, def,
+ index_key, index_key_len,
+ aux_data, aux_data_len,
+ netfs_data, object_size, enable);
+ else
+ return NULL;
+}
+
+/**
+ * fscache_relinquish_cookie - Return the cookie to the cache, maybe discarding
+ * it
+ * @cookie: The cookie being returned
+ * @aux_data: The updated auxiliary data for the cookie (may be NULL)
+ * @retire: True if the cache object the cookie represents is to be discarded
+ *
+ * This function returns a cookie to the cache, forcibly discarding the
+ * associated cache object if retire is set to true. The opportunity is
+ * provided to update the auxiliary data in the cache before the object is
+ * disconnected.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_relinquish_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ bool retire)
+{
+ if (fscache_cookie_valid(cookie))
+ __fscache_relinquish_cookie(cookie, aux_data, retire);
+}
+
+/**
+ * fscache_check_consistency - Request validation of a cache's auxiliary data
+ * @cookie: The cookie representing the cache object
+ * @aux_data: The updated auxiliary data for the cookie (may be NULL)
+ *
+ * Request an consistency check from fscache, which passes the request to the
+ * backing cache. The auxiliary data on the cookie will be updated first if
+ * @aux_data is set.
+ *
+ * Returns 0 if consistent and -ESTALE if inconsistent. May also
+ * return -ENOMEM and -ERESTARTSYS.
+ */
+static inline
+int fscache_check_consistency(struct fscache_cookie *cookie,
+ const void *aux_data)
+{
+ if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
+ return __fscache_check_consistency(cookie, aux_data);
+ else
+ return 0;
+}
+
+/**
+ * fscache_update_cookie - Request that a cache object be updated
+ * @cookie: The cookie representing the cache object
+ * @aux_data: The updated auxiliary data for the cookie (may be NULL)
+ *
+ * Request an update of the index data for the cache object associated with the
+ * cookie. The auxiliary data on the cookie will be updated first if @aux_data
+ * is set.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data)
+{
+ if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
+ __fscache_update_cookie(cookie, aux_data);
+}
+
+/**
+ * fscache_pin_cookie - Pin a data-storage cache object in its cache
+ * @cookie: The cookie representing the cache object
+ *
+ * Permit data-storage cache objects to be pinned in the cache.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+int fscache_pin_cookie(struct fscache_cookie *cookie)
+{
+ return -ENOBUFS;
+}
+
+/**
+ * fscache_pin_cookie - Unpin a data-storage cache object in its cache
+ * @cookie: The cookie representing the cache object
+ *
+ * Permit data-storage cache objects to be unpinned from the cache.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_unpin_cookie(struct fscache_cookie *cookie)
+{
+}
+
+/**
+ * fscache_attr_changed - Notify cache that an object's attributes changed
+ * @cookie: The cookie representing the cache object
+ *
+ * Send a notification to the cache indicating that an object's attributes have
+ * changed. This includes the data size. These attributes will be obtained
+ * through the get_attr() cookie definition op.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+int fscache_attr_changed(struct fscache_cookie *cookie)
+{
+ if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
+ return __fscache_attr_changed(cookie);
+ else
+ return -ENOBUFS;
+}
+
+/**
+ * fscache_invalidate - Notify cache that an object needs invalidation
+ * @cookie: The cookie representing the cache object
+ *
+ * Notify the cache that an object is needs to be invalidated and that it
+ * should abort any retrievals or stores it is doing on the cache. The object
+ * is then marked non-caching until such time as the invalidation is complete.
+ *
+ * This can be called with spinlocks held.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_invalidate(struct fscache_cookie *cookie)
+{
+ if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
+ __fscache_invalidate(cookie);
+}
+
+/**
+ * fscache_wait_on_invalidate - Wait for invalidation to complete
+ * @cookie: The cookie representing the cache object
+ *
+ * Wait for the invalidation of an object to complete.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_wait_on_invalidate(struct fscache_cookie *cookie)
+{
+ if (fscache_cookie_valid(cookie))
+ __fscache_wait_on_invalidate(cookie);
+}
+
+#ifdef FSCACHE_USE_NEW_IO_API
+
+/**
+ * fscache_begin_read_operation - Begin a read operation for the netfs lib
+ * @cres: The cache resources for the read being performed
+ * @cookie: The cookie representing the cache object
+ *
+ * Begin a read operation on behalf of the netfs helper library. @cres
+ * indicates the cache resources to which the operation state should be
+ * attached; @cookie indicates the cache object that will be accessed.
+ *
+ * This is intended to be called from the ->begin_cache_operation() netfs lib
+ * operation as implemented by the network filesystem.
+ *
+ * Returns:
+ * * 0 - Success
+ * * -ENOBUFS - No caching available
+ * * Other error code from the cache, such as -ENOMEM.
+ */
+static inline
+int fscache_begin_read_operation(struct netfs_cache_resources *cres,
+ struct fscache_cookie *cookie)
+{
+ if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
+ return __fscache_begin_operation(cres, cookie, false);
+ return -ENOBUFS;
+}
+
+/**
+ * fscache_operation_valid - Return true if operations resources are usable
+ * @cres: The resources to check.
+ *
+ * Returns a pointer to the operations table if usable or NULL if not.
+ */
+static inline
+const struct netfs_cache_ops *fscache_operation_valid(const struct netfs_cache_resources *cres)
+{
+ return fscache_resources_valid(cres) ? cres->ops : NULL;
+}
+
+/**
+ * fscache_read - Start a read from the cache.
+ * @cres: The cache resources to use
+ * @start_pos: The beginning file offset in the cache file
+ * @iter: The buffer to fill - and also the length
+ * @read_hole: How to handle a hole in the data.
+ * @term_func: The function to call upon completion
+ * @term_func_priv: The private data for @term_func
+ *
+ * Start a read from the cache. @cres indicates the cache object to read from
+ * and must be obtained by a call to fscache_begin_operation() beforehand.
+ *
+ * The data is read into the iterator, @iter, and that also indicates the size
+ * of the operation. @start_pos is the start position in the file, though if
+ * @seek_data is set appropriately, the cache can use SEEK_DATA to find the
+ * next piece of data, writing zeros for the hole into the iterator.
+ *
+ * Upon termination of the operation, @term_func will be called and supplied
+ * with @term_func_priv plus the amount of data written, if successful, or the
+ * error code otherwise.
+ */
+static inline
+int fscache_read(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ enum netfs_read_from_hole read_hole,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ const struct netfs_cache_ops *ops = fscache_operation_valid(cres);
+ return ops->read(cres, start_pos, iter, read_hole,
+ term_func, term_func_priv);
+}
+
+/**
+ * fscache_write - Start a write to the cache.
+ * @cres: The cache resources to use
+ * @start_pos: The beginning file offset in the cache file
+ * @iter: The data to write - and also the length
+ * @term_func: The function to call upon completion
+ * @term_func_priv: The private data for @term_func
+ *
+ * Start a write to the cache. @cres indicates the cache object to write to and
+ * must be obtained by a call to fscache_begin_operation() beforehand.
+ *
+ * The data to be written is obtained from the iterator, @iter, and that also
+ * indicates the size of the operation. @start_pos is the start position in
+ * the file.
+ *
+ * Upon termination of the operation, @term_func will be called and supplied
+ * with @term_func_priv plus the amount of data written, if successful, or the
+ * error code otherwise.
+ */
+static inline
+int fscache_write(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ const struct netfs_cache_ops *ops = fscache_operation_valid(cres);
+ return ops->write(cres, start_pos, iter, term_func, term_func_priv);
+}
+
+#endif /* FSCACHE_USE_NEW_IO_API */
+
+/**
+ * fscache_disable_cookie - Disable a cookie
+ * @cookie: The cookie representing the cache object
+ * @aux_data: The updated auxiliary data for the cookie (may be NULL)
+ * @invalidate: Invalidate the backing object
+ *
+ * Disable a cookie from accepting further alloc, read, write, invalidate,
+ * update or acquire operations. Outstanding operations can still be waited
+ * upon and pages can still be uncached and the cookie relinquished.
+ *
+ * This will not return until all outstanding operations have completed.
+ *
+ * If @invalidate is set, then the backing object will be invalidated and
+ * detached, otherwise it will just be detached.
+ *
+ * If @aux_data is set, then auxiliary data will be updated from that.
+ */
+static inline
+void fscache_disable_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ bool invalidate)
+{
+ if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie))
+ __fscache_disable_cookie(cookie, aux_data, invalidate);
+}
+
+/**
+ * fscache_enable_cookie - Reenable a cookie
+ * @cookie: The cookie representing the cache object
+ * @aux_data: The updated auxiliary data for the cookie (may be NULL)
+ * @object_size: Current size of object
+ * @can_enable: A function to permit enablement once lock is held
+ * @data: Data for can_enable()
+ *
+ * Reenable a previously disabled cookie, allowing it to accept further alloc,
+ * read, write, invalidate, update or acquire operations. An attempt will be
+ * made to immediately reattach the cookie to a backing object. If @aux_data
+ * is set, the auxiliary data attached to the cookie will be updated.
+ *
+ * The can_enable() function is called (if not NULL) once the enablement lock
+ * is held to rule on whether enablement is still permitted to go ahead.
+ */
+static inline
+void fscache_enable_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ loff_t object_size,
+ bool (*can_enable)(void *data),
+ void *data)
+{
+ if (fscache_cookie_valid(cookie) && !fscache_cookie_enabled(cookie))
+ __fscache_enable_cookie(cookie, aux_data, object_size,
+ can_enable, data);
+}
+
+#ifdef FSCACHE_USE_FALLBACK_IO_API
+
+/**
+ * fscache_fallback_read_page - Read a page from a cache object (DANGEROUS)
+ * @cookie: The cookie representing the cache object
+ * @page: The page to be read to
+ *
+ * Synchronously read a page from the cache. The page's offset is used to
+ * indicate where to read.
+ *
+ * This is dangerous and should be moved away from as it relies on the
+ * assumption that the backing filesystem will exactly record the blocks we
+ * have stored there.
+ */
+static inline
+int fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page)
+{
+ if (fscache_cookie_enabled(cookie))
+ return __fscache_fallback_read_page(cookie, page);
+ return -ENOBUFS;
+}
+
+/**
+ * fscache_fallback_write_page - Write a page to a cache object (DANGEROUS)
+ * @cookie: The cookie representing the cache object
+ * @page: The page to be written from
+ *
+ * Synchronously write a page to the cache. The page's offset is used to
+ * indicate where to write.
+ *
+ * This is dangerous and should be moved away from as it relies on the
+ * assumption that the backing filesystem will exactly record the blocks we
+ * have stored there.
+ */
+static inline
+int fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page)
+{
+ if (fscache_cookie_enabled(cookie))
+ return __fscache_fallback_write_page(cookie, page);
+ return -ENOBUFS;
+}
+
+#endif /* FSCACHE_USE_FALLBACK_IO_API */
+
+#endif /* _LINUX_FSCACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
deleted file mode 100644
index 446392f5ba83..000000000000
--- a/include/trace/events/fscache.h
+++ /dev/null
@@ -1,523 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* FS-Cache tracepoints
- *
- * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM fscache
-
-#if !defined(_TRACE_FSCACHE_H) || defined(TRACE_HEADER_MULTI_READ)
-#define _TRACE_FSCACHE_H
-
-#include <linux/fscache.h>
-#include <linux/tracepoint.h>
-
-/*
- * Define enums for tracing information.
- */
-#ifndef __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
-#define __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
-
-enum fscache_cookie_trace {
- fscache_cookie_collision,
- fscache_cookie_discard,
- fscache_cookie_get_acquire_parent,
- fscache_cookie_get_attach_object,
- fscache_cookie_get_reacquire,
- fscache_cookie_get_register_netfs,
- fscache_cookie_put_acquire_nobufs,
- fscache_cookie_put_dup_netfs,
- fscache_cookie_put_relinquish,
- fscache_cookie_put_object,
- fscache_cookie_put_parent,
-};
-
-enum fscache_page_trace {
- fscache_page_cached,
- fscache_page_inval,
- fscache_page_maybe_release,
- fscache_page_radix_clear_store,
- fscache_page_radix_delete,
- fscache_page_radix_insert,
- fscache_page_radix_pend2store,
- fscache_page_radix_set_pend,
- fscache_page_uncache,
- fscache_page_write,
- fscache_page_write_end,
- fscache_page_write_end_pend,
- fscache_page_write_end_noc,
- fscache_page_write_wait,
- fscache_page_trace__nr
-};
-
-enum fscache_op_trace {
- fscache_op_cancel,
- fscache_op_cancel_all,
- fscache_op_cancelled,
- fscache_op_completed,
- fscache_op_enqueue_async,
- fscache_op_enqueue_mythread,
- fscache_op_gc,
- fscache_op_init,
- fscache_op_put,
- fscache_op_run,
- fscache_op_signal,
- fscache_op_submit,
- fscache_op_submit_ex,
- fscache_op_work,
- fscache_op_trace__nr
-};
-
-enum fscache_page_op_trace {
- fscache_page_op_alloc_one,
- fscache_page_op_attr_changed,
- fscache_page_op_check_consistency,
- fscache_page_op_invalidate,
- fscache_page_op_retr_multi,
- fscache_page_op_retr_one,
- fscache_page_op_write_one,
- fscache_page_op_trace__nr
-};
-
-#endif
-
-/*
- * Declare tracing information enums and their string mappings for display.
- */
-#define fscache_cookie_traces \
- EM(fscache_cookie_collision, "*COLLISION*") \
- EM(fscache_cookie_discard, "DISCARD") \
- EM(fscache_cookie_get_acquire_parent, "GET prn") \
- EM(fscache_cookie_get_attach_object, "GET obj") \
- EM(fscache_cookie_get_reacquire, "GET raq") \
- EM(fscache_cookie_get_register_netfs, "GET net") \
- EM(fscache_cookie_put_acquire_nobufs, "PUT nbf") \
- EM(fscache_cookie_put_dup_netfs, "PUT dnt") \
- EM(fscache_cookie_put_relinquish, "PUT rlq") \
- EM(fscache_cookie_put_object, "PUT obj") \
- E_(fscache_cookie_put_parent, "PUT prn")
-
-#define fscache_page_traces \
- EM(fscache_page_cached, "Cached ") \
- EM(fscache_page_inval, "InvalPg") \
- EM(fscache_page_maybe_release, "MayRels") \
- EM(fscache_page_uncache, "Uncache") \
- EM(fscache_page_radix_clear_store, "RxCStr ") \
- EM(fscache_page_radix_delete, "RxDel ") \
- EM(fscache_page_radix_insert, "RxIns ") \
- EM(fscache_page_radix_pend2store, "RxP2S ") \
- EM(fscache_page_radix_set_pend, "RxSPend ") \
- EM(fscache_page_write, "WritePg") \
- EM(fscache_page_write_end, "EndPgWr") \
- EM(fscache_page_write_end_pend, "EndPgWP") \
- EM(fscache_page_write_end_noc, "EndPgNC") \
- E_(fscache_page_write_wait, "WtOnWrt")
-
-#define fscache_op_traces \
- EM(fscache_op_cancel, "Cancel1") \
- EM(fscache_op_cancel_all, "CancelA") \
- EM(fscache_op_cancelled, "Canclld") \
- EM(fscache_op_completed, "Complet") \
- EM(fscache_op_enqueue_async, "EnqAsyn") \
- EM(fscache_op_enqueue_mythread, "EnqMyTh") \
- EM(fscache_op_gc, "GC ") \
- EM(fscache_op_init, "Init ") \
- EM(fscache_op_put, "Put ") \
- EM(fscache_op_run, "Run ") \
- EM(fscache_op_signal, "Signal ") \
- EM(fscache_op_submit, "Submit ") \
- EM(fscache_op_submit_ex, "SubmitX") \
- E_(fscache_op_work, "Work ")
-
-#define fscache_page_op_traces \
- EM(fscache_page_op_alloc_one, "Alloc1 ") \
- EM(fscache_page_op_attr_changed, "AttrChg") \
- EM(fscache_page_op_check_consistency, "CheckCn") \
- EM(fscache_page_op_invalidate, "Inval ") \
- EM(fscache_page_op_retr_multi, "RetrMul") \
- EM(fscache_page_op_retr_one, "Retr1 ") \
- E_(fscache_page_op_write_one, "Write1 ")
-
-/*
- * Export enum symbols via userspace.
- */
-#undef EM
-#undef E_
-#define EM(a, b) TRACE_DEFINE_ENUM(a);
-#define E_(a, b) TRACE_DEFINE_ENUM(a);
-
-fscache_cookie_traces;
-
-/*
- * Now redefine the EM() and E_() macros to map the enums to the strings that
- * will be printed in the output.
- */
-#undef EM
-#undef E_
-#define EM(a, b) { a, b },
-#define E_(a, b) { a, b }
-
-
-TRACE_EVENT(fscache_cookie,
- TP_PROTO(unsigned int cookie_debug_id,
- int ref,
- enum fscache_cookie_trace where),
-
- TP_ARGS(cookie_debug_id, ref, where),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(enum fscache_cookie_trace, where )
- __field(int, ref )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie_debug_id;
- __entry->where = where;
- __entry->ref = ref;
- ),
-
- TP_printk("%s c=%08x r=%d",
- __print_symbolic(__entry->where, fscache_cookie_traces),
- __entry->cookie, __entry->ref)
- );
-
-TRACE_EVENT(fscache_netfs,
- TP_PROTO(struct fscache_netfs *netfs),
-
- TP_ARGS(netfs),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __array(char, name, 8 )
- ),
-
- TP_fast_assign(
- __entry->cookie = netfs->primary_index->debug_id;
- strncpy(__entry->name, netfs->name, 8);
- __entry->name[7] = 0;
- ),
-
- TP_printk("c=%08x n=%s",
- __entry->cookie, __entry->name)
- );
-
-TRACE_EVENT(fscache_acquire,
- TP_PROTO(struct fscache_cookie *cookie),
-
- TP_ARGS(cookie),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(unsigned int, parent )
- __array(char, name, 8 )
- __field(int, p_ref )
- __field(int, p_n_children )
- __field(u8, p_flags )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->parent = cookie->parent->debug_id;
- __entry->p_ref = refcount_read(&cookie->parent->ref);
- __entry->p_n_children = atomic_read(&cookie->parent->n_children);
- __entry->p_flags = cookie->parent->flags;
- memcpy(__entry->name, cookie->def->name, 8);
- __entry->name[7] = 0;
- ),
-
- TP_printk("c=%08x p=%08x pr=%d pc=%d pf=%02x n=%s",
- __entry->cookie, __entry->parent, __entry->p_ref,
- __entry->p_n_children, __entry->p_flags, __entry->name)
- );
-
-TRACE_EVENT(fscache_relinquish,
- TP_PROTO(struct fscache_cookie *cookie, bool retire),
-
- TP_ARGS(cookie, retire),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(unsigned int, parent )
- __field(int, ref )
- __field(int, n_children )
- __field(int, n_active )
- __field(u8, flags )
- __field(bool, retire )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->parent = cookie->parent->debug_id;
- __entry->ref = refcount_read(&cookie->ref);
- __entry->n_children = atomic_read(&cookie->n_children);
- __entry->n_active = atomic_read(&cookie->n_active);
- __entry->flags = cookie->flags;
- __entry->retire = retire;
- ),
-
- TP_printk("c=%08x r=%d p=%08x Nc=%d Na=%d f=%02x r=%u",
- __entry->cookie, __entry->ref,
- __entry->parent, __entry->n_children, __entry->n_active,
- __entry->flags, __entry->retire)
- );
-
-TRACE_EVENT(fscache_enable,
- TP_PROTO(struct fscache_cookie *cookie),
-
- TP_ARGS(cookie),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(int, ref )
- __field(int, n_children )
- __field(int, n_active )
- __field(u8, flags )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->ref = refcount_read(&cookie->ref);
- __entry->n_children = atomic_read(&cookie->n_children);
- __entry->n_active = atomic_read(&cookie->n_active);
- __entry->flags = cookie->flags;
- ),
-
- TP_printk("c=%08x r=%d Nc=%d Na=%d f=%02x",
- __entry->cookie, __entry->ref,
- __entry->n_children, __entry->n_active, __entry->flags)
- );
-
-TRACE_EVENT(fscache_disable,
- TP_PROTO(struct fscache_cookie *cookie),
-
- TP_ARGS(cookie),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(int, ref )
- __field(int, n_children )
- __field(int, n_active )
- __field(u8, flags )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->ref = refcount_read(&cookie->ref);
- __entry->n_children = atomic_read(&cookie->n_children);
- __entry->n_active = atomic_read(&cookie->n_active);
- __entry->flags = cookie->flags;
- ),
-
- TP_printk("c=%08x r=%d Nc=%d Na=%d f=%02x",
- __entry->cookie, __entry->ref,
- __entry->n_children, __entry->n_active, __entry->flags)
- );
-
-TRACE_EVENT(fscache_osm,
- TP_PROTO(struct fscache_object *object,
- const struct fscache_state *state,
- bool wait, bool oob, s8 event_num),
-
- TP_ARGS(object, state, wait, oob, event_num),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(unsigned int, object )
- __array(char, state, 8 )
- __field(bool, wait )
- __field(bool, oob )
- __field(s8, event_num )
- ),
-
- TP_fast_assign(
- __entry->cookie = object->cookie->debug_id;
- __entry->object = object->debug_id;
- __entry->wait = wait;
- __entry->oob = oob;
- __entry->event_num = event_num;
- memcpy(__entry->state, state->short_name, 8);
- ),
-
- TP_printk("c=%08x o=%08d %s %s%sev=%d",
- __entry->cookie,
- __entry->object,
- __entry->state,
- __print_symbolic(__entry->wait,
- { true, "WAIT" },
- { false, "WORK" }),
- __print_symbolic(__entry->oob,
- { true, " OOB " },
- { false, " " }),
- __entry->event_num)
- );
-
-TRACE_EVENT(fscache_page,
- TP_PROTO(struct fscache_cookie *cookie, struct page *page,
- enum fscache_page_trace why),
-
- TP_ARGS(cookie, page, why),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(pgoff_t, page )
- __field(enum fscache_page_trace, why )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->page = page->index;
- __entry->why = why;
- ),
-
- TP_printk("c=%08x %s pg=%lx",
- __entry->cookie,
- __print_symbolic(__entry->why, fscache_page_traces),
- __entry->page)
- );
-
-TRACE_EVENT(fscache_check_page,
- TP_PROTO(struct fscache_cookie *cookie, struct page *page,
- void *val, int n),
-
- TP_ARGS(cookie, page, val, n),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(void *, page )
- __field(void *, val )
- __field(int, n )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->page = page;
- __entry->val = val;
- __entry->n = n;
- ),
-
- TP_printk("c=%08x pg=%p val=%p n=%d",
- __entry->cookie, __entry->page, __entry->val, __entry->n)
- );
-
-TRACE_EVENT(fscache_wake_cookie,
- TP_PROTO(struct fscache_cookie *cookie),
-
- TP_ARGS(cookie),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- ),
-
- TP_printk("c=%08x", __entry->cookie)
- );
-
-TRACE_EVENT(fscache_op,
- TP_PROTO(struct fscache_cookie *cookie, struct fscache_operation *op,
- enum fscache_op_trace why),
-
- TP_ARGS(cookie, op, why),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(unsigned int, op )
- __field(enum fscache_op_trace, why )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie ? cookie->debug_id : 0;
- __entry->op = op->debug_id;
- __entry->why = why;
- ),
-
- TP_printk("c=%08x op=%08x %s",
- __entry->cookie, __entry->op,
- __print_symbolic(__entry->why, fscache_op_traces))
- );
-
-TRACE_EVENT(fscache_page_op,
- TP_PROTO(struct fscache_cookie *cookie, struct page *page,
- struct fscache_operation *op, enum fscache_page_op_trace what),
-
- TP_ARGS(cookie, page, op, what),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(unsigned int, op )
- __field(pgoff_t, page )
- __field(enum fscache_page_op_trace, what )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->page = page ? page->index : 0;
- __entry->op = op->debug_id;
- __entry->what = what;
- ),
-
- TP_printk("c=%08x %s pg=%lx op=%08x",
- __entry->cookie,
- __print_symbolic(__entry->what, fscache_page_op_traces),
- __entry->page, __entry->op)
- );
-
-TRACE_EVENT(fscache_wrote_page,
- TP_PROTO(struct fscache_cookie *cookie, struct page *page,
- struct fscache_operation *op, int ret),
-
- TP_ARGS(cookie, page, op, ret),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(unsigned int, op )
- __field(pgoff_t, page )
- __field(int, ret )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->page = page->index;
- __entry->op = op->debug_id;
- __entry->ret = ret;
- ),
-
- TP_printk("c=%08x pg=%lx op=%08x ret=%d",
- __entry->cookie, __entry->page, __entry->op, __entry->ret)
- );
-
-TRACE_EVENT(fscache_gang_lookup,
- TP_PROTO(struct fscache_cookie *cookie, struct fscache_operation *op,
- void **results, int n, pgoff_t store_limit),
-
- TP_ARGS(cookie, op, results, n, store_limit),
-
- TP_STRUCT__entry(
- __field(unsigned int, cookie )
- __field(unsigned int, op )
- __field(pgoff_t, results0 )
- __field(int, n )
- __field(pgoff_t, store_limit )
- ),
-
- TP_fast_assign(
- __entry->cookie = cookie->debug_id;
- __entry->op = op->debug_id;
- __entry->results0 = results[0] ? ((struct page *)results[0])->index : (pgoff_t)-1;
- __entry->n = n;
- __entry->store_limit = store_limit;
- ),
-
- TP_printk("c=%08x op=%08x r0=%lx n=%d sl=%lx",
- __entry->cookie, __entry->op, __entry->results0, __entry->n,
- __entry->store_limit)
- );
-
-#endif /* _TRACE_FSCACHE_H */
-
-/* This part must be outside protection */
-#include <trace/define_trace.h>
diff --git a/include/trace/events/fscache_old.h b/include/trace/events/fscache_old.h
new file mode 100644
index 000000000000..2408f3c5554b
--- /dev/null
+++ b/include/trace/events/fscache_old.h
@@ -0,0 +1,523 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* FS-Cache tracepoints
+ *
+ * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fscache_old
+
+#if !defined(_TRACE_FSCACHE_OLD_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FSCACHE_OLD_H
+
+#include <linux/fscache_old.h>
+#include <linux/tracepoint.h>
+
+/*
+ * Define enums for tracing information.
+ */
+#ifndef __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
+#define __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
+
+enum fscache_cookie_trace {
+ fscache_cookie_collision,
+ fscache_cookie_discard,
+ fscache_cookie_get_acquire_parent,
+ fscache_cookie_get_attach_object,
+ fscache_cookie_get_reacquire,
+ fscache_cookie_get_register_netfs,
+ fscache_cookie_put_acquire_nobufs,
+ fscache_cookie_put_dup_netfs,
+ fscache_cookie_put_relinquish,
+ fscache_cookie_put_object,
+ fscache_cookie_put_parent,
+};
+
+enum fscache_page_trace {
+ fscache_page_cached,
+ fscache_page_inval,
+ fscache_page_maybe_release,
+ fscache_page_radix_clear_store,
+ fscache_page_radix_delete,
+ fscache_page_radix_insert,
+ fscache_page_radix_pend2store,
+ fscache_page_radix_set_pend,
+ fscache_page_uncache,
+ fscache_page_write,
+ fscache_page_write_end,
+ fscache_page_write_end_pend,
+ fscache_page_write_end_noc,
+ fscache_page_write_wait,
+ fscache_page_trace__nr
+};
+
+enum fscache_op_trace {
+ fscache_op_cancel,
+ fscache_op_cancel_all,
+ fscache_op_cancelled,
+ fscache_op_completed,
+ fscache_op_enqueue_async,
+ fscache_op_enqueue_mythread,
+ fscache_op_gc,
+ fscache_op_init,
+ fscache_op_put,
+ fscache_op_run,
+ fscache_op_signal,
+ fscache_op_submit,
+ fscache_op_submit_ex,
+ fscache_op_work,
+ fscache_op_trace__nr
+};
+
+enum fscache_page_op_trace {
+ fscache_page_op_alloc_one,
+ fscache_page_op_attr_changed,
+ fscache_page_op_check_consistency,
+ fscache_page_op_invalidate,
+ fscache_page_op_retr_multi,
+ fscache_page_op_retr_one,
+ fscache_page_op_write_one,
+ fscache_page_op_trace__nr
+};
+
+#endif
+
+/*
+ * Declare tracing information enums and their string mappings for display.
+ */
+#define fscache_cookie_traces \
+ EM(fscache_cookie_collision, "*COLLISION*") \
+ EM(fscache_cookie_discard, "DISCARD") \
+ EM(fscache_cookie_get_acquire_parent, "GET prn") \
+ EM(fscache_cookie_get_attach_object, "GET obj") \
+ EM(fscache_cookie_get_reacquire, "GET raq") \
+ EM(fscache_cookie_get_register_netfs, "GET net") \
+ EM(fscache_cookie_put_acquire_nobufs, "PUT nbf") \
+ EM(fscache_cookie_put_dup_netfs, "PUT dnt") \
+ EM(fscache_cookie_put_relinquish, "PUT rlq") \
+ EM(fscache_cookie_put_object, "PUT obj") \
+ E_(fscache_cookie_put_parent, "PUT prn")
+
+#define fscache_page_traces \
+ EM(fscache_page_cached, "Cached ") \
+ EM(fscache_page_inval, "InvalPg") \
+ EM(fscache_page_maybe_release, "MayRels") \
+ EM(fscache_page_uncache, "Uncache") \
+ EM(fscache_page_radix_clear_store, "RxCStr ") \
+ EM(fscache_page_radix_delete, "RxDel ") \
+ EM(fscache_page_radix_insert, "RxIns ") \
+ EM(fscache_page_radix_pend2store, "RxP2S ") \
+ EM(fscache_page_radix_set_pend, "RxSPend ") \
+ EM(fscache_page_write, "WritePg") \
+ EM(fscache_page_write_end, "EndPgWr") \
+ EM(fscache_page_write_end_pend, "EndPgWP") \
+ EM(fscache_page_write_end_noc, "EndPgNC") \
+ E_(fscache_page_write_wait, "WtOnWrt")
+
+#define fscache_op_traces \
+ EM(fscache_op_cancel, "Cancel1") \
+ EM(fscache_op_cancel_all, "CancelA") \
+ EM(fscache_op_cancelled, "Canclld") \
+ EM(fscache_op_completed, "Complet") \
+ EM(fscache_op_enqueue_async, "EnqAsyn") \
+ EM(fscache_op_enqueue_mythread, "EnqMyTh") \
+ EM(fscache_op_gc, "GC ") \
+ EM(fscache_op_init, "Init ") \
+ EM(fscache_op_put, "Put ") \
+ EM(fscache_op_run, "Run ") \
+ EM(fscache_op_signal, "Signal ") \
+ EM(fscache_op_submit, "Submit ") \
+ EM(fscache_op_submit_ex, "SubmitX") \
+ E_(fscache_op_work, "Work ")
+
+#define fscache_page_op_traces \
+ EM(fscache_page_op_alloc_one, "Alloc1 ") \
+ EM(fscache_page_op_attr_changed, "AttrChg") \
+ EM(fscache_page_op_check_consistency, "CheckCn") \
+ EM(fscache_page_op_invalidate, "Inval ") \
+ EM(fscache_page_op_retr_multi, "RetrMul") \
+ EM(fscache_page_op_retr_one, "Retr1 ") \
+ E_(fscache_page_op_write_one, "Write1 ")
+
+/*
+ * Export enum symbols via userspace.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) TRACE_DEFINE_ENUM(a);
+#define E_(a, b) TRACE_DEFINE_ENUM(a);
+
+fscache_cookie_traces;
+
+/*
+ * Now redefine the EM() and E_() macros to map the enums to the strings that
+ * will be printed in the output.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) { a, b },
+#define E_(a, b) { a, b }
+
+
+TRACE_EVENT(fscache_cookie,
+ TP_PROTO(unsigned int cookie_debug_id,
+ int ref,
+ enum fscache_cookie_trace where),
+
+ TP_ARGS(cookie_debug_id, ref, where),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(enum fscache_cookie_trace, where )
+ __field(int, ref )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie_debug_id;
+ __entry->where = where;
+ __entry->ref = ref;
+ ),
+
+ TP_printk("%s c=%08x r=%d",
+ __print_symbolic(__entry->where, fscache_cookie_traces),
+ __entry->cookie, __entry->ref)
+ );
+
+TRACE_EVENT(fscache_netfs,
+ TP_PROTO(struct fscache_netfs *netfs),
+
+ TP_ARGS(netfs),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __array(char, name, 8 )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = netfs->primary_index->debug_id;
+ strncpy(__entry->name, netfs->name, 8);
+ __entry->name[7] = 0;
+ ),
+
+ TP_printk("c=%08x n=%s",
+ __entry->cookie, __entry->name)
+ );
+
+TRACE_EVENT(fscache_acquire,
+ TP_PROTO(struct fscache_cookie *cookie),
+
+ TP_ARGS(cookie),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, parent )
+ __array(char, name, 8 )
+ __field(int, p_ref )
+ __field(int, p_n_children )
+ __field(u8, p_flags )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->parent = cookie->parent->debug_id;
+ __entry->p_ref = refcount_read(&cookie->parent->ref);
+ __entry->p_n_children = atomic_read(&cookie->parent->n_children);
+ __entry->p_flags = cookie->parent->flags;
+ memcpy(__entry->name, cookie->def->name, 8);
+ __entry->name[7] = 0;
+ ),
+
+ TP_printk("c=%08x p=%08x pr=%d pc=%d pf=%02x n=%s",
+ __entry->cookie, __entry->parent, __entry->p_ref,
+ __entry->p_n_children, __entry->p_flags, __entry->name)
+ );
+
+TRACE_EVENT(fscache_relinquish,
+ TP_PROTO(struct fscache_cookie *cookie, bool retire),
+
+ TP_ARGS(cookie, retire),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, parent )
+ __field(int, ref )
+ __field(int, n_children )
+ __field(int, n_active )
+ __field(u8, flags )
+ __field(bool, retire )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->parent = cookie->parent->debug_id;
+ __entry->ref = refcount_read(&cookie->ref);
+ __entry->n_children = atomic_read(&cookie->n_children);
+ __entry->n_active = atomic_read(&cookie->n_active);
+ __entry->flags = cookie->flags;
+ __entry->retire = retire;
+ ),
+
+ TP_printk("c=%08x r=%d p=%08x Nc=%d Na=%d f=%02x r=%u",
+ __entry->cookie, __entry->ref,
+ __entry->parent, __entry->n_children, __entry->n_active,
+ __entry->flags, __entry->retire)
+ );
+
+TRACE_EVENT(fscache_enable,
+ TP_PROTO(struct fscache_cookie *cookie),
+
+ TP_ARGS(cookie),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(int, ref )
+ __field(int, n_children )
+ __field(int, n_active )
+ __field(u8, flags )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->ref = refcount_read(&cookie->ref);
+ __entry->n_children = atomic_read(&cookie->n_children);
+ __entry->n_active = atomic_read(&cookie->n_active);
+ __entry->flags = cookie->flags;
+ ),
+
+ TP_printk("c=%08x r=%d Nc=%d Na=%d f=%02x",
+ __entry->cookie, __entry->ref,
+ __entry->n_children, __entry->n_active, __entry->flags)
+ );
+
+TRACE_EVENT(fscache_disable,
+ TP_PROTO(struct fscache_cookie *cookie),
+
+ TP_ARGS(cookie),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(int, ref )
+ __field(int, n_children )
+ __field(int, n_active )
+ __field(u8, flags )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->ref = refcount_read(&cookie->ref);
+ __entry->n_children = atomic_read(&cookie->n_children);
+ __entry->n_active = atomic_read(&cookie->n_active);
+ __entry->flags = cookie->flags;
+ ),
+
+ TP_printk("c=%08x r=%d Nc=%d Na=%d f=%02x",
+ __entry->cookie, __entry->ref,
+ __entry->n_children, __entry->n_active, __entry->flags)
+ );
+
+TRACE_EVENT(fscache_osm,
+ TP_PROTO(struct fscache_object *object,
+ const struct fscache_state *state,
+ bool wait, bool oob, s8 event_num),
+
+ TP_ARGS(object, state, wait, oob, event_num),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, object )
+ __array(char, state, 8 )
+ __field(bool, wait )
+ __field(bool, oob )
+ __field(s8, event_num )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = object->cookie->debug_id;
+ __entry->object = object->debug_id;
+ __entry->wait = wait;
+ __entry->oob = oob;
+ __entry->event_num = event_num;
+ memcpy(__entry->state, state->short_name, 8);
+ ),
+
+ TP_printk("c=%08x o=%08d %s %s%sev=%d",
+ __entry->cookie,
+ __entry->object,
+ __entry->state,
+ __print_symbolic(__entry->wait,
+ { true, "WAIT" },
+ { false, "WORK" }),
+ __print_symbolic(__entry->oob,
+ { true, " OOB " },
+ { false, " " }),
+ __entry->event_num)
+ );
+
+TRACE_EVENT(fscache_page,
+ TP_PROTO(struct fscache_cookie *cookie, struct page *page,
+ enum fscache_page_trace why),
+
+ TP_ARGS(cookie, page, why),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(pgoff_t, page )
+ __field(enum fscache_page_trace, why )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->page = page->index;
+ __entry->why = why;
+ ),
+
+ TP_printk("c=%08x %s pg=%lx",
+ __entry->cookie,
+ __print_symbolic(__entry->why, fscache_page_traces),
+ __entry->page)
+ );
+
+TRACE_EVENT(fscache_check_page,
+ TP_PROTO(struct fscache_cookie *cookie, struct page *page,
+ void *val, int n),
+
+ TP_ARGS(cookie, page, val, n),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(void *, page )
+ __field(void *, val )
+ __field(int, n )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->page = page;
+ __entry->val = val;
+ __entry->n = n;
+ ),
+
+ TP_printk("c=%08x pg=%p val=%p n=%d",
+ __entry->cookie, __entry->page, __entry->val, __entry->n)
+ );
+
+TRACE_EVENT(fscache_wake_cookie,
+ TP_PROTO(struct fscache_cookie *cookie),
+
+ TP_ARGS(cookie),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ ),
+
+ TP_printk("c=%08x", __entry->cookie)
+ );
+
+TRACE_EVENT(fscache_op,
+ TP_PROTO(struct fscache_cookie *cookie, struct fscache_operation *op,
+ enum fscache_op_trace why),
+
+ TP_ARGS(cookie, op, why),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, op )
+ __field(enum fscache_op_trace, why )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie ? cookie->debug_id : 0;
+ __entry->op = op->debug_id;
+ __entry->why = why;
+ ),
+
+ TP_printk("c=%08x op=%08x %s",
+ __entry->cookie, __entry->op,
+ __print_symbolic(__entry->why, fscache_op_traces))
+ );
+
+TRACE_EVENT(fscache_page_op,
+ TP_PROTO(struct fscache_cookie *cookie, struct page *page,
+ struct fscache_operation *op, enum fscache_page_op_trace what),
+
+ TP_ARGS(cookie, page, op, what),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, op )
+ __field(pgoff_t, page )
+ __field(enum fscache_page_op_trace, what )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->page = page ? page->index : 0;
+ __entry->op = op->debug_id;
+ __entry->what = what;
+ ),
+
+ TP_printk("c=%08x %s pg=%lx op=%08x",
+ __entry->cookie,
+ __print_symbolic(__entry->what, fscache_page_op_traces),
+ __entry->page, __entry->op)
+ );
+
+TRACE_EVENT(fscache_wrote_page,
+ TP_PROTO(struct fscache_cookie *cookie, struct page *page,
+ struct fscache_operation *op, int ret),
+
+ TP_ARGS(cookie, page, op, ret),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, op )
+ __field(pgoff_t, page )
+ __field(int, ret )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->page = page->index;
+ __entry->op = op->debug_id;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("c=%08x pg=%lx op=%08x ret=%d",
+ __entry->cookie, __entry->page, __entry->op, __entry->ret)
+ );
+
+TRACE_EVENT(fscache_gang_lookup,
+ TP_PROTO(struct fscache_cookie *cookie, struct fscache_operation *op,
+ void **results, int n, pgoff_t store_limit),
+
+ TP_ARGS(cookie, op, results, n, store_limit),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, op )
+ __field(pgoff_t, results0 )
+ __field(int, n )
+ __field(pgoff_t, store_limit )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->op = op->debug_id;
+ __entry->results0 = results[0] ? ((struct page *)results[0])->index : (pgoff_t)-1;
+ __entry->n = n;
+ __entry->store_limit = store_limit;
+ ),
+
+ TP_printk("c=%08x op=%08x r0=%lx n=%d sl=%lx",
+ __entry->cookie, __entry->op, __entry->results0, __entry->n,
+ __entry->store_limit)
+ );
+
+#endif /* _TRACE_FSCACHE_OLD_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 02/53] fscache_old: Rename CONFIG_FSCACHE* to CONFIG_FSCACHE_OLD*
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
2021-10-22 18:58 ` [PATCH v2 01/53] fscache_old: Move the old fscache driver to one side David Howells
@ 2021-10-22 18:59 ` David Howells
2021-10-22 18:59 ` [PATCH v2 03/53] cachefiles_old: Move the old cachefiles driver to one side David Howells
` (52 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 18:59 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Rename the CONFIG_FSCACHE* config symbols to CONFIG_FSCACHE_OLD*.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/9p/Kconfig | 2 +-
fs/Makefile | 2 +-
fs/afs/Kconfig | 2 +-
fs/cachefiles/Kconfig | 2 +-
fs/ceph/Kconfig | 2 +-
fs/cifs/Kconfig | 2 +-
fs/fscache_old/Kconfig | 12 ++++++------
fs/fscache_old/Makefile | 4 ++--
fs/fscache_old/internal.h | 4 ++--
fs/fscache_old/object.c | 2 +-
fs/fscache_old/proc.c | 12 ++++++------
fs/nfs/Kconfig | 2 +-
12 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/fs/9p/Kconfig b/fs/9p/Kconfig
index d7bc93447c85..b11c15c30bac 100644
--- a/fs/9p/Kconfig
+++ b/fs/9p/Kconfig
@@ -14,7 +14,7 @@ config 9P_FS
if 9P_FS
config 9P_FSCACHE
bool "Enable 9P client caching support"
- depends on 9P_FS=m && FSCACHE || 9P_FS=y && FSCACHE=y
+ depends on 9P_FS=m && FSCACHE_OLD || 9P_FS=y && FSCACHE_OLD=y
help
Choose Y here to enable persistent, read-only local
caching support for 9p clients using FS-Cache
diff --git a/fs/Makefile b/fs/Makefile
index 8b87c9406ecc..21cf51dbf8b2 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -67,7 +67,7 @@ obj-$(CONFIG_DLM) += dlm/
# Do not add any filesystems before this line
obj-$(CONFIG_NETFS_SUPPORT) += netfs/
-obj-$(CONFIG_FSCACHE) += fscache_old/
+obj-$(CONFIG_FSCACHE_OLD) += fscache_old/
obj-$(CONFIG_REISERFS_FS) += reiserfs/
obj-$(CONFIG_EXT4_FS) += ext4/
# We place ext4 before ext2 so that clean ext3 root fs's do NOT mount using the
diff --git a/fs/afs/Kconfig b/fs/afs/Kconfig
index fc8ba9142f2f..dbb1ee5fb261 100644
--- a/fs/afs/Kconfig
+++ b/fs/afs/Kconfig
@@ -25,7 +25,7 @@ config AFS_DEBUG
config AFS_FSCACHE
bool "Provide AFS client caching support"
- depends on AFS_FS=m && FSCACHE || AFS_FS=y && FSCACHE=y
+ depends on AFS_FS=m && FSCACHE_OLD || AFS_FS=y && FSCACHE_OLD=y
help
Say Y here if you want AFS data to be cached locally on disk through
the generic filesystem cache manager
diff --git a/fs/cachefiles/Kconfig b/fs/cachefiles/Kconfig
index 6827b40f7ddc..7f3e1881fb21 100644
--- a/fs/cachefiles/Kconfig
+++ b/fs/cachefiles/Kconfig
@@ -2,7 +2,7 @@
config CACHEFILES
tristate "Filesystem caching on files"
- depends on FSCACHE && BLOCK
+ depends on FSCACHE_OLD && BLOCK
help
This permits use of a mounted filesystem as a cache for other
filesystems - primarily networking filesystems - thus allowing fast
diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig
index 94df854147d3..77ad452337ee 100644
--- a/fs/ceph/Kconfig
+++ b/fs/ceph/Kconfig
@@ -21,7 +21,7 @@ config CEPH_FS
if CEPH_FS
config CEPH_FSCACHE
bool "Enable Ceph client caching support"
- depends on CEPH_FS=m && FSCACHE || CEPH_FS=y && FSCACHE=y
+ depends on CEPH_FS=m && FSCACHE_OLD || CEPH_FS=y && FSCACHE_OLD=y
help
Choose Y here to enable persistent, read-only local
caching support for Ceph clients using FS-Cache
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index 3b7e3b9e4fd2..c5477abbcff0 100644
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -188,7 +188,7 @@ config CIFS_SMB_DIRECT
config CIFS_FSCACHE
bool "Provide CIFS client caching support"
- depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
+ depends on CIFS=m && FSCACHE_OLD || CIFS=y && FSCACHE_OLD=y
help
Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
to be cached locally on disk through the general filesystem cache
diff --git a/fs/fscache_old/Kconfig b/fs/fscache_old/Kconfig
index b313a978ae0a..a5a657246df8 100644
--- a/fs/fscache_old/Kconfig
+++ b/fs/fscache_old/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
-config FSCACHE
- tristate "General filesystem local caching manager"
+config FSCACHE_OLD
+ tristate "General filesystem local caching manager (old driver)"
select NETFS_SUPPORT
help
This option enables a generic filesystem caching manager that can be
@@ -11,9 +11,9 @@ config FSCACHE
See Documentation/filesystems/caching/fscache.rst for more information.
-config FSCACHE_STATS
+config FSCACHE_OLD_STATS
bool "Gather statistical information on local caching"
- depends on FSCACHE && PROC_FS
+ depends on FSCACHE_OLD && PROC_FS
select NETFS_STATS
help
This option causes statistical information to be gathered on local
@@ -29,9 +29,9 @@ config FSCACHE_STATS
See Documentation/filesystems/caching/fscache.rst for more information.
-config FSCACHE_DEBUG
+config FSCACHE_OLD_DEBUG
bool "Debug FS-Cache"
- depends on FSCACHE
+ depends on FSCACHE_OLD
help
This permits debugging to be dynamically enabled in the local caching
management module. If this is set, the debugging output may be
diff --git a/fs/fscache_old/Makefile b/fs/fscache_old/Makefile
index 03a871d689bb..55d5ef397e8c 100644
--- a/fs/fscache_old/Makefile
+++ b/fs/fscache_old/Makefile
@@ -15,6 +15,6 @@ fscache-y := \
page.o
fscache-$(CONFIG_PROC_FS) += proc.o
-fscache-$(CONFIG_FSCACHE_STATS) += stats.o
+fscache-$(CONFIG_FSCACHE_OLD_STATS) += stats.o
-obj-$(CONFIG_FSCACHE) := fscache.o
+obj-$(CONFIG_FSCACHE_OLD) := fscache.o
diff --git a/fs/fscache_old/internal.h b/fs/fscache_old/internal.h
index 7288622cf2c3..07cc997d6832 100644
--- a/fs/fscache_old/internal.h
+++ b/fs/fscache_old/internal.h
@@ -131,7 +131,7 @@ extern void fscache_proc_cleanup(void);
/*
* stats.c
*/
-#ifdef CONFIG_FSCACHE_STATS
+#ifdef CONFIG_FSCACHE_OLD_STATS
extern atomic_t fscache_n_ops_processed[FSCACHE_MAX_THREADS];
extern atomic_t fscache_n_objs_processed[FSCACHE_MAX_THREADS];
@@ -303,7 +303,7 @@ void fscache_update_aux(struct fscache_cookie *cookie, const void *aux_data)
#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
-#elif defined(CONFIG_FSCACHE_DEBUG)
+#elif defined(CONFIG_FSCACHE_OLD_DEBUG)
#define _enter(FMT, ...) \
do { \
if (__do_kdebug(ENTER)) \
diff --git a/fs/fscache_old/object.c b/fs/fscache_old/object.c
index 86ad941726f7..365ba306397a 100644
--- a/fs/fscache_old/object.c
+++ b/fs/fscache_old/object.c
@@ -321,7 +321,7 @@ void fscache_object_init(struct fscache_object *object,
object->cookie = cookie;
fscache_cookie_get(cookie, fscache_cookie_get_attach_object);
object->parent = NULL;
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
+#ifdef CONFIG_FSCACHE_OLD_OBJECT_LIST
RB_CLEAR_NODE(&object->objlist_link);
#endif
diff --git a/fs/fscache_old/proc.c b/fs/fscache_old/proc.c
index 061df8f61ffc..a96f67b57e0c 100644
--- a/fs/fscache_old/proc.c
+++ b/fs/fscache_old/proc.c
@@ -25,13 +25,13 @@ int __init fscache_proc_init(void)
&fscache_cookies_seq_ops))
goto error_cookies;
-#ifdef CONFIG_FSCACHE_STATS
+#ifdef CONFIG_FSCACHE_OLD_STATS
if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
fscache_stats_show))
goto error_stats;
#endif
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
+#ifdef CONFIG_FSCACHE_OLD_OBJECT_LIST
if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
&fscache_objlist_proc_ops))
goto error_objects;
@@ -40,10 +40,10 @@ int __init fscache_proc_init(void)
_leave(" = 0");
return 0;
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
+#ifdef CONFIG_FSCACHE_OLD_OBJECT_LIST
error_objects:
#endif
-#ifdef CONFIG_FSCACHE_STATS
+#ifdef CONFIG_FSCACHE_OLD_STATS
remove_proc_entry("fs/fscache/stats", NULL);
error_stats:
#endif
@@ -60,10 +60,10 @@ int __init fscache_proc_init(void)
*/
void fscache_proc_cleanup(void)
{
-#ifdef CONFIG_FSCACHE_OBJECT_LIST
+#ifdef CONFIG_FSCACHE_OLD_OBJECT_LIST
remove_proc_entry("fs/fscache/objects", NULL);
#endif
-#ifdef CONFIG_FSCACHE_STATS
+#ifdef CONFIG_FSCACHE_OLD_STATS
remove_proc_entry("fs/fscache/stats", NULL);
#endif
remove_proc_entry("fs/fscache/cookies", NULL);
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 14a72224b657..a8b73c90aa00 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -170,7 +170,7 @@ config ROOT_NFS
config NFS_FSCACHE
bool "Provide NFS client caching support"
- depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
+ depends on NFS_FS=m && FSCACHE_OLD || NFS_FS=y && FSCACHE_OLD=y
help
Say Y here if you want NFS data to be cached locally on disc through
the general filesystem cache manager
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 03/53] cachefiles_old: Move the old cachefiles driver to one side
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
2021-10-22 18:58 ` [PATCH v2 01/53] fscache_old: Move the old fscache driver to one side David Howells
2021-10-22 18:59 ` [PATCH v2 02/53] fscache_old: Rename CONFIG_FSCACHE* to CONFIG_FSCACHE_OLD* David Howells
@ 2021-10-22 18:59 ` David Howells
2021-10-22 18:59 ` [PATCH v2 04/53] cachefiles_old: Rename CONFIG_CACHEFILES* to CONFIG_CACHEFILES_OLD* David Howells
` (51 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 18:59 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Move the old cachefiles driver to fs/cachefiles_old/. This leaves
fs/cachefiles/ free for a rewritten driver.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/Kconfig | 2
fs/Makefile | 2
fs/cachefiles/Kconfig | 21 -
fs/cachefiles/Makefile | 17 -
fs/cachefiles/bind.c | 278 ---------
fs/cachefiles/daemon.c | 748 ------------------------
fs/cachefiles/interface.c | 557 ------------------
fs/cachefiles/internal.h | 312 ----------
fs/cachefiles/io.c | 445 --------------
fs/cachefiles/key.c | 155 -----
fs/cachefiles/main.c | 94 ---
fs/cachefiles/namei.c | 1018 ---------------------------------
fs/cachefiles/security.c | 112 ----
fs/cachefiles/xattr.c | 324 -----------
fs/cachefiles_old/Kconfig | 21 +
fs/cachefiles_old/Makefile | 17 +
fs/cachefiles_old/bind.c | 278 +++++++++
fs/cachefiles_old/daemon.c | 748 ++++++++++++++++++++++++
fs/cachefiles_old/interface.c | 557 ++++++++++++++++++
fs/cachefiles_old/internal.h | 312 ++++++++++
fs/cachefiles_old/io.c | 445 ++++++++++++++
fs/cachefiles_old/key.c | 155 +++++
fs/cachefiles_old/main.c | 94 +++
fs/cachefiles_old/namei.c | 1018 +++++++++++++++++++++++++++++++++
fs/cachefiles_old/security.c | 112 ++++
fs/cachefiles_old/xattr.c | 324 +++++++++++
include/trace/events/cachefiles.h | 321 ----------
include/trace/events/cachefiles_old.h | 321 ++++++++++
28 files changed, 4404 insertions(+), 4404 deletions(-)
delete mode 100644 fs/cachefiles/Kconfig
delete mode 100644 fs/cachefiles/Makefile
delete mode 100644 fs/cachefiles/bind.c
delete mode 100644 fs/cachefiles/daemon.c
delete mode 100644 fs/cachefiles/interface.c
delete mode 100644 fs/cachefiles/internal.h
delete mode 100644 fs/cachefiles/io.c
delete mode 100644 fs/cachefiles/key.c
delete mode 100644 fs/cachefiles/main.c
delete mode 100644 fs/cachefiles/namei.c
delete mode 100644 fs/cachefiles/security.c
delete mode 100644 fs/cachefiles/xattr.c
create mode 100644 fs/cachefiles_old/Kconfig
create mode 100644 fs/cachefiles_old/Makefile
create mode 100644 fs/cachefiles_old/bind.c
create mode 100644 fs/cachefiles_old/daemon.c
create mode 100644 fs/cachefiles_old/interface.c
create mode 100644 fs/cachefiles_old/internal.h
create mode 100644 fs/cachefiles_old/io.c
create mode 100644 fs/cachefiles_old/key.c
create mode 100644 fs/cachefiles_old/main.c
create mode 100644 fs/cachefiles_old/namei.c
create mode 100644 fs/cachefiles_old/security.c
create mode 100644 fs/cachefiles_old/xattr.c
delete mode 100644 include/trace/events/cachefiles.h
create mode 100644 include/trace/events/cachefiles_old.h
diff --git a/fs/Kconfig b/fs/Kconfig
index 966361e471bc..944f8b21f17c 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -132,7 +132,7 @@ menu "Caches"
source "fs/netfs/Kconfig"
source "fs/fscache_old/Kconfig"
-source "fs/cachefiles/Kconfig"
+source "fs/cachefiles_old/Kconfig"
endmenu
diff --git a/fs/Makefile b/fs/Makefile
index 21cf51dbf8b2..6e6dbcd04cae 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -125,7 +125,7 @@ obj-$(CONFIG_AFS_FS) += afs/
obj-$(CONFIG_NILFS2_FS) += nilfs2/
obj-$(CONFIG_BEFS_FS) += befs/
obj-$(CONFIG_HOSTFS) += hostfs/
-obj-$(CONFIG_CACHEFILES) += cachefiles/
+obj-$(CONFIG_CACHEFILES) += cachefiles_old/
obj-$(CONFIG_DEBUG_FS) += debugfs/
obj-$(CONFIG_TRACING) += tracefs/
obj-$(CONFIG_OCFS2_FS) += ocfs2/
diff --git a/fs/cachefiles/Kconfig b/fs/cachefiles/Kconfig
deleted file mode 100644
index 7f3e1881fb21..000000000000
--- a/fs/cachefiles/Kconfig
+++ /dev/null
@@ -1,21 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-
-config CACHEFILES
- tristate "Filesystem caching on files"
- depends on FSCACHE_OLD && BLOCK
- help
- This permits use of a mounted filesystem as a cache for other
- filesystems - primarily networking filesystems - thus allowing fast
- local disk to enhance the speed of slower devices.
-
- See Documentation/filesystems/caching/cachefiles.rst for more
- information.
-
-config CACHEFILES_DEBUG
- bool "Debug CacheFiles"
- depends on CACHEFILES
- help
- This permits debugging to be dynamically enabled in the filesystem
- caching on files module. If this is set, the debugging output may be
- enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
- by including a debugging specifier in /etc/cachefilesd.conf.
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
deleted file mode 100644
index 714e84b3ca24..000000000000
--- a/fs/cachefiles/Makefile
+++ /dev/null
@@ -1,17 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for caching in a mounted filesystem
-#
-
-cachefiles-y := \
- bind.o \
- daemon.o \
- interface.o \
- io.o \
- key.o \
- main.o \
- namei.o \
- security.o \
- xattr.o
-
-obj-$(CONFIG_CACHEFILES) := cachefiles.o
diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c
deleted file mode 100644
index d463d89f5db8..000000000000
--- a/fs/cachefiles/bind.c
+++ /dev/null
@@ -1,278 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Bind and unbind a cache from the filesystem backing it
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/namei.h>
-#include <linux/mount.h>
-#include <linux/statfs.h>
-#include <linux/ctype.h>
-#include <linux/xattr.h>
-#include "internal.h"
-
-static int cachefiles_daemon_add_cache(struct cachefiles_cache *caches);
-
-/*
- * bind a directory as a cache
- */
-int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
-{
- _enter("{%u,%u,%u,%u,%u,%u},%s",
- cache->frun_percent,
- cache->fcull_percent,
- cache->fstop_percent,
- cache->brun_percent,
- cache->bcull_percent,
- cache->bstop_percent,
- args);
-
- /* start by checking things over */
- ASSERT(cache->fstop_percent >= 0 &&
- cache->fstop_percent < cache->fcull_percent &&
- cache->fcull_percent < cache->frun_percent &&
- cache->frun_percent < 100);
-
- ASSERT(cache->bstop_percent >= 0 &&
- cache->bstop_percent < cache->bcull_percent &&
- cache->bcull_percent < cache->brun_percent &&
- cache->brun_percent < 100);
-
- if (*args) {
- pr_err("'bind' command doesn't take an argument\n");
- return -EINVAL;
- }
-
- if (!cache->rootdirname) {
- pr_err("No cache directory specified\n");
- return -EINVAL;
- }
-
- /* don't permit already bound caches to be re-bound */
- if (test_bit(CACHEFILES_READY, &cache->flags)) {
- pr_err("Cache already bound\n");
- return -EBUSY;
- }
-
- /* make sure we have copies of the tag and dirname strings */
- if (!cache->tag) {
- /* the tag string is released by the fops->release()
- * function, so we don't release it on error here */
- cache->tag = kstrdup("CacheFiles", GFP_KERNEL);
- if (!cache->tag)
- return -ENOMEM;
- }
-
- /* add the cache */
- return cachefiles_daemon_add_cache(cache);
-}
-
-/*
- * add a cache
- */
-static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
-{
- struct cachefiles_object *fsdef;
- struct path path;
- struct kstatfs stats;
- struct dentry *graveyard, *cachedir, *root;
- const struct cred *saved_cred;
- int ret;
-
- _enter("");
-
- /* we want to work under the module's security ID */
- ret = cachefiles_get_security_ID(cache);
- if (ret < 0)
- return ret;
-
- cachefiles_begin_secure(cache, &saved_cred);
-
- /* allocate the root index object */
- ret = -ENOMEM;
-
- fsdef = kmem_cache_alloc(cachefiles_object_jar, GFP_KERNEL);
- if (!fsdef)
- goto error_root_object;
-
- ASSERTCMP(fsdef->backer, ==, NULL);
-
- atomic_set(&fsdef->usage, 1);
- fsdef->type = FSCACHE_COOKIE_TYPE_INDEX;
-
- /* look up the directory at the root of the cache */
- ret = kern_path(cache->rootdirname, LOOKUP_DIRECTORY, &path);
- if (ret < 0)
- goto error_open_root;
-
- cache->mnt = path.mnt;
- root = path.dentry;
-
- ret = -EINVAL;
- if (mnt_user_ns(path.mnt) != &init_user_ns) {
- pr_warn("File cache on idmapped mounts not supported");
- goto error_unsupported;
- }
-
- /* check parameters */
- ret = -EOPNOTSUPP;
- if (d_is_negative(root) ||
- !d_backing_inode(root)->i_op->lookup ||
- !d_backing_inode(root)->i_op->mkdir ||
- !(d_backing_inode(root)->i_opflags & IOP_XATTR) ||
- !root->d_sb->s_op->statfs ||
- !root->d_sb->s_op->sync_fs)
- goto error_unsupported;
-
- ret = -EROFS;
- if (sb_rdonly(root->d_sb))
- goto error_unsupported;
-
- /* determine the security of the on-disk cache as this governs
- * security ID of files we create */
- ret = cachefiles_determine_cache_security(cache, root, &saved_cred);
- if (ret < 0)
- goto error_unsupported;
-
- /* get the cache size and blocksize */
- ret = vfs_statfs(&path, &stats);
- if (ret < 0)
- goto error_unsupported;
-
- ret = -ERANGE;
- if (stats.f_bsize <= 0)
- goto error_unsupported;
-
- ret = -EOPNOTSUPP;
- if (stats.f_bsize > PAGE_SIZE)
- goto error_unsupported;
-
- cache->bsize = stats.f_bsize;
- cache->bshift = 0;
- if (stats.f_bsize < PAGE_SIZE)
- cache->bshift = PAGE_SHIFT - ilog2(stats.f_bsize);
-
- _debug("blksize %u (shift %u)",
- cache->bsize, cache->bshift);
-
- _debug("size %llu, avail %llu",
- (unsigned long long) stats.f_blocks,
- (unsigned long long) stats.f_bavail);
-
- /* set up caching limits */
- do_div(stats.f_files, 100);
- cache->fstop = stats.f_files * cache->fstop_percent;
- cache->fcull = stats.f_files * cache->fcull_percent;
- cache->frun = stats.f_files * cache->frun_percent;
-
- _debug("limits {%llu,%llu,%llu} files",
- (unsigned long long) cache->frun,
- (unsigned long long) cache->fcull,
- (unsigned long long) cache->fstop);
-
- stats.f_blocks >>= cache->bshift;
- do_div(stats.f_blocks, 100);
- cache->bstop = stats.f_blocks * cache->bstop_percent;
- cache->bcull = stats.f_blocks * cache->bcull_percent;
- cache->brun = stats.f_blocks * cache->brun_percent;
-
- _debug("limits {%llu,%llu,%llu} blocks",
- (unsigned long long) cache->brun,
- (unsigned long long) cache->bcull,
- (unsigned long long) cache->bstop);
-
- /* get the cache directory and check its type */
- cachedir = cachefiles_get_directory(cache, root, "cache");
- if (IS_ERR(cachedir)) {
- ret = PTR_ERR(cachedir);
- goto error_unsupported;
- }
-
- fsdef->dentry = cachedir;
- fsdef->fscache.cookie = NULL;
-
- ret = cachefiles_check_object_type(fsdef);
- if (ret < 0)
- goto error_unsupported;
-
- /* get the graveyard directory */
- graveyard = cachefiles_get_directory(cache, root, "graveyard");
- if (IS_ERR(graveyard)) {
- ret = PTR_ERR(graveyard);
- goto error_unsupported;
- }
-
- cache->graveyard = graveyard;
-
- /* publish the cache */
- fscache_init_cache(&cache->cache,
- &cachefiles_cache_ops,
- "%s",
- fsdef->dentry->d_sb->s_id);
-
- fscache_object_init(&fsdef->fscache, &fscache_fsdef_index,
- &cache->cache);
-
- ret = fscache_add_cache(&cache->cache, &fsdef->fscache, cache->tag);
- if (ret < 0)
- goto error_add_cache;
-
- /* done */
- set_bit(CACHEFILES_READY, &cache->flags);
- dput(root);
-
- pr_info("File cache on %s registered\n", cache->cache.identifier);
-
- /* check how much space the cache has */
- cachefiles_has_space(cache, 0, 0);
- cachefiles_end_secure(cache, saved_cred);
- return 0;
-
-error_add_cache:
- dput(cache->graveyard);
- cache->graveyard = NULL;
-error_unsupported:
- mntput(cache->mnt);
- cache->mnt = NULL;
- dput(fsdef->dentry);
- fsdef->dentry = NULL;
- dput(root);
-error_open_root:
- kmem_cache_free(cachefiles_object_jar, fsdef);
-error_root_object:
- cachefiles_end_secure(cache, saved_cred);
- pr_err("Failed to register: %d\n", ret);
- return ret;
-}
-
-/*
- * unbind a cache on fd release
- */
-void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
-{
- _enter("");
-
- if (test_bit(CACHEFILES_READY, &cache->flags)) {
- pr_info("File cache on %s unregistering\n",
- cache->cache.identifier);
-
- fscache_withdraw_cache(&cache->cache);
- }
-
- dput(cache->graveyard);
- mntput(cache->mnt);
-
- kfree(cache->rootdirname);
- kfree(cache->secctx);
- kfree(cache->tag);
-
- _leave("");
-}
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
deleted file mode 100644
index 752c1e43416f..000000000000
--- a/fs/cachefiles/daemon.c
+++ /dev/null
@@ -1,748 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Daemon interface
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/namei.h>
-#include <linux/poll.h>
-#include <linux/mount.h>
-#include <linux/statfs.h>
-#include <linux/ctype.h>
-#include <linux/string.h>
-#include <linux/fs_struct.h>
-#include "internal.h"
-
-static int cachefiles_daemon_open(struct inode *, struct file *);
-static int cachefiles_daemon_release(struct inode *, struct file *);
-static ssize_t cachefiles_daemon_read(struct file *, char __user *, size_t,
- loff_t *);
-static ssize_t cachefiles_daemon_write(struct file *, const char __user *,
- size_t, loff_t *);
-static __poll_t cachefiles_daemon_poll(struct file *,
- struct poll_table_struct *);
-static int cachefiles_daemon_frun(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_fcull(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_fstop(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_brun(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_bcull(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_bstop(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_cull(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_debug(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_dir(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_inuse(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_secctx(struct cachefiles_cache *, char *);
-static int cachefiles_daemon_tag(struct cachefiles_cache *, char *);
-
-static unsigned long cachefiles_open;
-
-const struct file_operations cachefiles_daemon_fops = {
- .owner = THIS_MODULE,
- .open = cachefiles_daemon_open,
- .release = cachefiles_daemon_release,
- .read = cachefiles_daemon_read,
- .write = cachefiles_daemon_write,
- .poll = cachefiles_daemon_poll,
- .llseek = noop_llseek,
-};
-
-struct cachefiles_daemon_cmd {
- char name[8];
- int (*handler)(struct cachefiles_cache *cache, char *args);
-};
-
-static const struct cachefiles_daemon_cmd cachefiles_daemon_cmds[] = {
- { "bind", cachefiles_daemon_bind },
- { "brun", cachefiles_daemon_brun },
- { "bcull", cachefiles_daemon_bcull },
- { "bstop", cachefiles_daemon_bstop },
- { "cull", cachefiles_daemon_cull },
- { "debug", cachefiles_daemon_debug },
- { "dir", cachefiles_daemon_dir },
- { "frun", cachefiles_daemon_frun },
- { "fcull", cachefiles_daemon_fcull },
- { "fstop", cachefiles_daemon_fstop },
- { "inuse", cachefiles_daemon_inuse },
- { "secctx", cachefiles_daemon_secctx },
- { "tag", cachefiles_daemon_tag },
- { "", NULL }
-};
-
-
-/*
- * do various checks
- */
-static int cachefiles_daemon_open(struct inode *inode, struct file *file)
-{
- struct cachefiles_cache *cache;
-
- _enter("");
-
- /* only the superuser may do this */
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- /* the cachefiles device may only be open once at a time */
- if (xchg(&cachefiles_open, 1) == 1)
- return -EBUSY;
-
- /* allocate a cache record */
- cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL);
- if (!cache) {
- cachefiles_open = 0;
- return -ENOMEM;
- }
-
- mutex_init(&cache->daemon_mutex);
- cache->active_nodes = RB_ROOT;
- rwlock_init(&cache->active_lock);
- init_waitqueue_head(&cache->daemon_pollwq);
-
- /* set default caching limits
- * - limit at 1% free space and/or free files
- * - cull below 5% free space and/or free files
- * - cease culling above 7% free space and/or free files
- */
- cache->frun_percent = 7;
- cache->fcull_percent = 5;
- cache->fstop_percent = 1;
- cache->brun_percent = 7;
- cache->bcull_percent = 5;
- cache->bstop_percent = 1;
-
- file->private_data = cache;
- cache->cachefilesd = file;
- return 0;
-}
-
-/*
- * release a cache
- */
-static int cachefiles_daemon_release(struct inode *inode, struct file *file)
-{
- struct cachefiles_cache *cache = file->private_data;
-
- _enter("");
-
- ASSERT(cache);
-
- set_bit(CACHEFILES_DEAD, &cache->flags);
-
- cachefiles_daemon_unbind(cache);
-
- ASSERT(!cache->active_nodes.rb_node);
-
- /* clean up the control file interface */
- cache->cachefilesd = NULL;
- file->private_data = NULL;
- cachefiles_open = 0;
-
- kfree(cache);
-
- _leave("");
- return 0;
-}
-
-/*
- * read the cache state
- */
-static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer,
- size_t buflen, loff_t *pos)
-{
- struct cachefiles_cache *cache = file->private_data;
- unsigned long long b_released;
- unsigned f_released;
- char buffer[256];
- int n;
-
- //_enter(",,%zu,", buflen);
-
- if (!test_bit(CACHEFILES_READY, &cache->flags))
- return 0;
-
- /* check how much space the cache has */
- cachefiles_has_space(cache, 0, 0);
-
- /* summarise */
- f_released = atomic_xchg(&cache->f_released, 0);
- b_released = atomic_long_xchg(&cache->b_released, 0);
- clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
-
- n = snprintf(buffer, sizeof(buffer),
- "cull=%c"
- " frun=%llx"
- " fcull=%llx"
- " fstop=%llx"
- " brun=%llx"
- " bcull=%llx"
- " bstop=%llx"
- " freleased=%x"
- " breleased=%llx",
- test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0',
- (unsigned long long) cache->frun,
- (unsigned long long) cache->fcull,
- (unsigned long long) cache->fstop,
- (unsigned long long) cache->brun,
- (unsigned long long) cache->bcull,
- (unsigned long long) cache->bstop,
- f_released,
- b_released);
-
- if (n > buflen)
- return -EMSGSIZE;
-
- if (copy_to_user(_buffer, buffer, n) != 0)
- return -EFAULT;
-
- return n;
-}
-
-/*
- * command the cache
- */
-static ssize_t cachefiles_daemon_write(struct file *file,
- const char __user *_data,
- size_t datalen,
- loff_t *pos)
-{
- const struct cachefiles_daemon_cmd *cmd;
- struct cachefiles_cache *cache = file->private_data;
- ssize_t ret;
- char *data, *args, *cp;
-
- //_enter(",,%zu,", datalen);
-
- ASSERT(cache);
-
- if (test_bit(CACHEFILES_DEAD, &cache->flags))
- return -EIO;
-
- if (datalen < 0 || datalen > PAGE_SIZE - 1)
- return -EOPNOTSUPP;
-
- /* drag the command string into the kernel so we can parse it */
- data = memdup_user_nul(_data, datalen);
- if (IS_ERR(data))
- return PTR_ERR(data);
-
- ret = -EINVAL;
- if (memchr(data, '\0', datalen))
- goto error;
-
- /* strip any newline */
- cp = memchr(data, '\n', datalen);
- if (cp) {
- if (cp == data)
- goto error;
-
- *cp = '\0';
- }
-
- /* parse the command */
- ret = -EOPNOTSUPP;
-
- for (args = data; *args; args++)
- if (isspace(*args))
- break;
- if (*args) {
- if (args == data)
- goto error;
- *args = '\0';
- args = skip_spaces(++args);
- }
-
- /* run the appropriate command handler */
- for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++)
- if (strcmp(cmd->name, data) == 0)
- goto found_command;
-
-error:
- kfree(data);
- //_leave(" = %zd", ret);
- return ret;
-
-found_command:
- mutex_lock(&cache->daemon_mutex);
-
- ret = -EIO;
- if (!test_bit(CACHEFILES_DEAD, &cache->flags))
- ret = cmd->handler(cache, args);
-
- mutex_unlock(&cache->daemon_mutex);
-
- if (ret == 0)
- ret = datalen;
- goto error;
-}
-
-/*
- * poll for culling state
- * - use EPOLLOUT to indicate culling state
- */
-static __poll_t cachefiles_daemon_poll(struct file *file,
- struct poll_table_struct *poll)
-{
- struct cachefiles_cache *cache = file->private_data;
- __poll_t mask;
-
- poll_wait(file, &cache->daemon_pollwq, poll);
- mask = 0;
-
- if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags))
- mask |= EPOLLIN;
-
- if (test_bit(CACHEFILES_CULLING, &cache->flags))
- mask |= EPOLLOUT;
-
- return mask;
-}
-
-/*
- * give a range error for cache space constraints
- * - can be tail-called
- */
-static int cachefiles_daemon_range_error(struct cachefiles_cache *cache,
- char *args)
-{
- pr_err("Free space limits must be in range 0%%<=stop<cull<run<100%%\n");
-
- return -EINVAL;
-}
-
-/*
- * set the percentage of files at which to stop culling
- * - command: "frun <N>%"
- */
-static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args)
-{
- unsigned long frun;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- frun = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (frun <= cache->fcull_percent || frun >= 100)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->frun_percent = frun;
- return 0;
-}
-
-/*
- * set the percentage of files at which to start culling
- * - command: "fcull <N>%"
- */
-static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args)
-{
- unsigned long fcull;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- fcull = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->fcull_percent = fcull;
- return 0;
-}
-
-/*
- * set the percentage of files at which to stop allocating
- * - command: "fstop <N>%"
- */
-static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)
-{
- unsigned long fstop;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- fstop = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (fstop < 0 || fstop >= cache->fcull_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->fstop_percent = fstop;
- return 0;
-}
-
-/*
- * set the percentage of blocks at which to stop culling
- * - command: "brun <N>%"
- */
-static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args)
-{
- unsigned long brun;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- brun = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (brun <= cache->bcull_percent || brun >= 100)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->brun_percent = brun;
- return 0;
-}
-
-/*
- * set the percentage of blocks at which to start culling
- * - command: "bcull <N>%"
- */
-static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args)
-{
- unsigned long bcull;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- bcull = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->bcull_percent = bcull;
- return 0;
-}
-
-/*
- * set the percentage of blocks at which to stop allocating
- * - command: "bstop <N>%"
- */
-static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)
-{
- unsigned long bstop;
-
- _enter(",%s", args);
-
- if (!*args)
- return -EINVAL;
-
- bstop = simple_strtoul(args, &args, 10);
- if (args[0] != '%' || args[1] != '\0')
- return -EINVAL;
-
- if (bstop < 0 || bstop >= cache->bcull_percent)
- return cachefiles_daemon_range_error(cache, args);
-
- cache->bstop_percent = bstop;
- return 0;
-}
-
-/*
- * set the cache directory
- * - command: "dir <name>"
- */
-static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)
-{
- char *dir;
-
- _enter(",%s", args);
-
- if (!*args) {
- pr_err("Empty directory specified\n");
- return -EINVAL;
- }
-
- if (cache->rootdirname) {
- pr_err("Second cache directory specified\n");
- return -EEXIST;
- }
-
- dir = kstrdup(args, GFP_KERNEL);
- if (!dir)
- return -ENOMEM;
-
- cache->rootdirname = dir;
- return 0;
-}
-
-/*
- * set the cache security context
- * - command: "secctx <ctx>"
- */
-static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)
-{
- char *secctx;
-
- _enter(",%s", args);
-
- if (!*args) {
- pr_err("Empty security context specified\n");
- return -EINVAL;
- }
-
- if (cache->secctx) {
- pr_err("Second security context specified\n");
- return -EINVAL;
- }
-
- secctx = kstrdup(args, GFP_KERNEL);
- if (!secctx)
- return -ENOMEM;
-
- cache->secctx = secctx;
- return 0;
-}
-
-/*
- * set the cache tag
- * - command: "tag <name>"
- */
-static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)
-{
- char *tag;
-
- _enter(",%s", args);
-
- if (!*args) {
- pr_err("Empty tag specified\n");
- return -EINVAL;
- }
-
- if (cache->tag)
- return -EEXIST;
-
- tag = kstrdup(args, GFP_KERNEL);
- if (!tag)
- return -ENOMEM;
-
- cache->tag = tag;
- return 0;
-}
-
-/*
- * request a node in the cache be culled from the current working directory
- * - command: "cull <name>"
- */
-static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
-{
- struct path path;
- const struct cred *saved_cred;
- int ret;
-
- _enter(",%s", args);
-
- if (strchr(args, '/'))
- goto inval;
-
- if (!test_bit(CACHEFILES_READY, &cache->flags)) {
- pr_err("cull applied to unready cache\n");
- return -EIO;
- }
-
- if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
- pr_err("cull applied to dead cache\n");
- return -EIO;
- }
-
- /* extract the directory dentry from the cwd */
- get_fs_pwd(current->fs, &path);
-
- if (!d_can_lookup(path.dentry))
- goto notdir;
-
- cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_cull(cache, path.dentry, args);
- cachefiles_end_secure(cache, saved_cred);
-
- path_put(&path);
- _leave(" = %d", ret);
- return ret;
-
-notdir:
- path_put(&path);
- pr_err("cull command requires dirfd to be a directory\n");
- return -ENOTDIR;
-
-inval:
- pr_err("cull command requires dirfd and filename\n");
- return -EINVAL;
-}
-
-/*
- * set debugging mode
- * - command: "debug <mask>"
- */
-static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)
-{
- unsigned long mask;
-
- _enter(",%s", args);
-
- mask = simple_strtoul(args, &args, 0);
- if (args[0] != '\0')
- goto inval;
-
- cachefiles_debug = mask;
- _leave(" = 0");
- return 0;
-
-inval:
- pr_err("debug command requires mask\n");
- return -EINVAL;
-}
-
-/*
- * find out whether an object in the current working directory is in use or not
- * - command: "inuse <name>"
- */
-static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
-{
- struct path path;
- const struct cred *saved_cred;
- int ret;
-
- //_enter(",%s", args);
-
- if (strchr(args, '/'))
- goto inval;
-
- if (!test_bit(CACHEFILES_READY, &cache->flags)) {
- pr_err("inuse applied to unready cache\n");
- return -EIO;
- }
-
- if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
- pr_err("inuse applied to dead cache\n");
- return -EIO;
- }
-
- /* extract the directory dentry from the cwd */
- get_fs_pwd(current->fs, &path);
-
- if (!d_can_lookup(path.dentry))
- goto notdir;
-
- cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_check_in_use(cache, path.dentry, args);
- cachefiles_end_secure(cache, saved_cred);
-
- path_put(&path);
- //_leave(" = %d", ret);
- return ret;
-
-notdir:
- path_put(&path);
- pr_err("inuse command requires dirfd to be a directory\n");
- return -ENOTDIR;
-
-inval:
- pr_err("inuse command requires dirfd and filename\n");
- return -EINVAL;
-}
-
-/*
- * see if we have space for a number of pages and/or a number of files in the
- * cache
- */
-int cachefiles_has_space(struct cachefiles_cache *cache,
- unsigned fnr, unsigned bnr)
-{
- struct kstatfs stats;
- struct path path = {
- .mnt = cache->mnt,
- .dentry = cache->mnt->mnt_root,
- };
- int ret;
-
- //_enter("{%llu,%llu,%llu,%llu,%llu,%llu},%u,%u",
- // (unsigned long long) cache->frun,
- // (unsigned long long) cache->fcull,
- // (unsigned long long) cache->fstop,
- // (unsigned long long) cache->brun,
- // (unsigned long long) cache->bcull,
- // (unsigned long long) cache->bstop,
- // fnr, bnr);
-
- /* find out how many pages of blockdev are available */
- memset(&stats, 0, sizeof(stats));
-
- ret = vfs_statfs(&path, &stats);
- if (ret < 0) {
- if (ret == -EIO)
- cachefiles_io_error(cache, "statfs failed");
- _leave(" = %d", ret);
- return ret;
- }
-
- stats.f_bavail >>= cache->bshift;
-
- //_debug("avail %llu,%llu",
- // (unsigned long long) stats.f_ffree,
- // (unsigned long long) stats.f_bavail);
-
- /* see if there is sufficient space */
- if (stats.f_ffree > fnr)
- stats.f_ffree -= fnr;
- else
- stats.f_ffree = 0;
-
- if (stats.f_bavail > bnr)
- stats.f_bavail -= bnr;
- else
- stats.f_bavail = 0;
-
- ret = -ENOBUFS;
- if (stats.f_ffree < cache->fstop ||
- stats.f_bavail < cache->bstop)
- goto begin_cull;
-
- ret = 0;
- if (stats.f_ffree < cache->fcull ||
- stats.f_bavail < cache->bcull)
- goto begin_cull;
-
- if (test_bit(CACHEFILES_CULLING, &cache->flags) &&
- stats.f_ffree >= cache->frun &&
- stats.f_bavail >= cache->brun &&
- test_and_clear_bit(CACHEFILES_CULLING, &cache->flags)
- ) {
- _debug("cease culling");
- cachefiles_state_changed(cache);
- }
-
- //_leave(" = 0");
- return 0;
-
-begin_cull:
- if (!test_and_set_bit(CACHEFILES_CULLING, &cache->flags)) {
- _debug("### CULL CACHE ###");
- cachefiles_state_changed(cache);
- }
-
- _leave(" = %d", ret);
- return ret;
-}
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
deleted file mode 100644
index 83671488a323..000000000000
--- a/fs/cachefiles/interface.c
+++ /dev/null
@@ -1,557 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache interface to CacheFiles
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/slab.h>
-#include <linux/mount.h>
-#include "internal.h"
-
-struct cachefiles_lookup_data {
- struct cachefiles_xattr *auxdata; /* auxiliary data */
- char *key; /* key path */
-};
-
-static int cachefiles_attr_changed(struct fscache_object *_object);
-
-/*
- * allocate an object record for a cookie lookup and prepare the lookup data
- */
-static struct fscache_object *cachefiles_alloc_object(
- struct fscache_cache *_cache,
- struct fscache_cookie *cookie)
-{
- struct cachefiles_lookup_data *lookup_data;
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- struct cachefiles_xattr *auxdata;
- unsigned keylen, auxlen;
- void *buffer, *p;
- char *key;
-
- cache = container_of(_cache, struct cachefiles_cache, cache);
-
- _enter("{%s},%x,", cache->cache.identifier, cookie->debug_id);
-
- lookup_data = kmalloc(sizeof(*lookup_data), cachefiles_gfp);
- if (!lookup_data)
- goto nomem_lookup_data;
-
- /* create a new object record and a temporary leaf image */
- object = kmem_cache_alloc(cachefiles_object_jar, cachefiles_gfp);
- if (!object)
- goto nomem_object;
-
- ASSERTCMP(object->backer, ==, NULL);
-
- BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
- atomic_set(&object->usage, 1);
-
- fscache_object_init(&object->fscache, cookie, &cache->cache);
-
- object->type = cookie->def->type;
-
- /* get hold of the raw key
- * - stick the length on the front and leave space on the back for the
- * encoder
- */
- buffer = kmalloc((2 + 512) + 3, cachefiles_gfp);
- if (!buffer)
- goto nomem_buffer;
-
- keylen = cookie->key_len;
- if (keylen <= sizeof(cookie->inline_key))
- p = cookie->inline_key;
- else
- p = cookie->key;
- memcpy(buffer + 2, p, keylen);
-
- *(uint16_t *)buffer = keylen;
- ((char *)buffer)[keylen + 2] = 0;
- ((char *)buffer)[keylen + 3] = 0;
- ((char *)buffer)[keylen + 4] = 0;
-
- /* turn the raw key into something that can work with as a filename */
- key = cachefiles_cook_key(buffer, keylen + 2, object->type);
- if (!key)
- goto nomem_key;
-
- /* get hold of the auxiliary data and prepend the object type */
- auxdata = buffer;
- auxlen = cookie->aux_len;
- if (auxlen) {
- if (auxlen <= sizeof(cookie->inline_aux))
- p = cookie->inline_aux;
- else
- p = cookie->aux;
- memcpy(auxdata->data, p, auxlen);
- }
-
- auxdata->len = auxlen + 1;
- auxdata->type = cookie->type;
-
- lookup_data->auxdata = auxdata;
- lookup_data->key = key;
- object->lookup_data = lookup_data;
-
- _leave(" = %x [%p]", object->fscache.debug_id, lookup_data);
- return &object->fscache;
-
-nomem_key:
- kfree(buffer);
-nomem_buffer:
- BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
- kmem_cache_free(cachefiles_object_jar, object);
- fscache_object_destroyed(&cache->cache);
-nomem_object:
- kfree(lookup_data);
-nomem_lookup_data:
- _leave(" = -ENOMEM");
- return ERR_PTR(-ENOMEM);
-}
-
-/*
- * attempt to look up the nominated node in this cache
- * - return -ETIMEDOUT to be scheduled again
- */
-static int cachefiles_lookup_object(struct fscache_object *_object)
-{
- struct cachefiles_lookup_data *lookup_data;
- struct cachefiles_object *parent, *object;
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- int ret;
-
- _enter("{OBJ%x}", _object->debug_id);
-
- cache = container_of(_object->cache, struct cachefiles_cache, cache);
- parent = container_of(_object->parent,
- struct cachefiles_object, fscache);
- object = container_of(_object, struct cachefiles_object, fscache);
- lookup_data = object->lookup_data;
-
- ASSERTCMP(lookup_data, !=, NULL);
-
- /* look up the key, creating any missing bits */
- cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_walk_to_object(parent, object,
- lookup_data->key,
- lookup_data->auxdata);
- cachefiles_end_secure(cache, saved_cred);
-
- /* polish off by setting the attributes of non-index files */
- if (ret == 0 &&
- object->fscache.cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX)
- cachefiles_attr_changed(&object->fscache);
-
- if (ret < 0 && ret != -ETIMEDOUT) {
- if (ret != -ENOBUFS)
- pr_warn("Lookup failed error %d\n", ret);
- fscache_object_lookup_error(&object->fscache);
- }
-
- _leave(" [%d]", ret);
- return ret;
-}
-
-/*
- * indication of lookup completion
- */
-static void cachefiles_lookup_complete(struct fscache_object *_object)
-{
- struct cachefiles_object *object;
-
- object = container_of(_object, struct cachefiles_object, fscache);
-
- _enter("{OBJ%x,%p}", object->fscache.debug_id, object->lookup_data);
-
- if (object->lookup_data) {
- kfree(object->lookup_data->key);
- kfree(object->lookup_data->auxdata);
- kfree(object->lookup_data);
- object->lookup_data = NULL;
- }
-}
-
-/*
- * increment the usage count on an inode object (may fail if unmounting)
- */
-static
-struct fscache_object *cachefiles_grab_object(struct fscache_object *_object,
- enum fscache_obj_ref_trace why)
-{
- struct cachefiles_object *object =
- container_of(_object, struct cachefiles_object, fscache);
- int u;
-
- _enter("{OBJ%x,%d}", _object->debug_id, atomic_read(&object->usage));
-
-#ifdef CACHEFILES_DEBUG_SLAB
- ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
-#endif
-
- u = atomic_inc_return(&object->usage);
- trace_cachefiles_ref(object, _object->cookie,
- (enum cachefiles_obj_ref_trace)why, u);
- return &object->fscache;
-}
-
-/*
- * update the auxiliary data for an object object on disk
- */
-static void cachefiles_update_object(struct fscache_object *_object)
-{
- struct cachefiles_object *object;
- struct cachefiles_xattr *auxdata;
- struct cachefiles_cache *cache;
- struct fscache_cookie *cookie;
- const struct cred *saved_cred;
- const void *aux;
- unsigned auxlen;
-
- _enter("{OBJ%x}", _object->debug_id);
-
- object = container_of(_object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache, struct cachefiles_cache,
- cache);
-
- if (!fscache_use_cookie(_object)) {
- _leave(" [relinq]");
- return;
- }
-
- cookie = object->fscache.cookie;
- auxlen = cookie->aux_len;
-
- if (!auxlen) {
- fscache_unuse_cookie(_object);
- _leave(" [no aux]");
- return;
- }
-
- auxdata = kmalloc(2 + auxlen + 3, cachefiles_gfp);
- if (!auxdata) {
- fscache_unuse_cookie(_object);
- _leave(" [nomem]");
- return;
- }
-
- aux = (auxlen <= sizeof(cookie->inline_aux)) ?
- cookie->inline_aux : cookie->aux;
-
- memcpy(auxdata->data, aux, auxlen);
- fscache_unuse_cookie(_object);
-
- auxdata->len = auxlen + 1;
- auxdata->type = cookie->type;
-
- cachefiles_begin_secure(cache, &saved_cred);
- cachefiles_update_object_xattr(object, auxdata);
- cachefiles_end_secure(cache, saved_cred);
- kfree(auxdata);
- _leave("");
-}
-
-/*
- * discard the resources pinned by an object and effect retirement if
- * requested
- */
-static void cachefiles_drop_object(struct fscache_object *_object)
-{
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- struct inode *inode;
- blkcnt_t i_blocks = 0;
-
- ASSERT(_object);
-
- object = container_of(_object, struct cachefiles_object, fscache);
-
- _enter("{OBJ%x,%d}",
- object->fscache.debug_id, atomic_read(&object->usage));
-
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
-
-#ifdef CACHEFILES_DEBUG_SLAB
- ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
-#endif
-
- /* We need to tidy the object up if we did in fact manage to open it.
- * It's possible for us to get here before the object is fully
- * initialised if the parent goes away or the object gets retired
- * before we set it up.
- */
- if (object->dentry) {
- /* delete retired objects */
- if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
- _object != cache->cache.fsdef
- ) {
- _debug("- retire object OBJ%x", object->fscache.debug_id);
- inode = d_backing_inode(object->dentry);
- if (inode)
- i_blocks = inode->i_blocks;
-
- cachefiles_begin_secure(cache, &saved_cred);
- cachefiles_delete_object(cache, object);
- cachefiles_end_secure(cache, saved_cred);
- }
-
- /* close the filesystem stuff attached to the object */
- if (object->backer != object->dentry)
- dput(object->backer);
- object->backer = NULL;
- }
-
- /* note that the object is now inactive */
- if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags))
- cachefiles_mark_object_inactive(cache, object, i_blocks);
-
- dput(object->dentry);
- object->dentry = NULL;
-
- _leave("");
-}
-
-/*
- * dispose of a reference to an object
- */
-void cachefiles_put_object(struct fscache_object *_object,
- enum fscache_obj_ref_trace why)
-{
- struct cachefiles_object *object;
- struct fscache_cache *cache;
- int u;
-
- ASSERT(_object);
-
- object = container_of(_object, struct cachefiles_object, fscache);
-
- _enter("{OBJ%x,%d}",
- object->fscache.debug_id, atomic_read(&object->usage));
-
-#ifdef CACHEFILES_DEBUG_SLAB
- ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
-#endif
-
- ASSERTIFCMP(object->fscache.parent,
- object->fscache.parent->n_children, >, 0);
-
- u = atomic_dec_return(&object->usage);
- trace_cachefiles_ref(object, _object->cookie,
- (enum cachefiles_obj_ref_trace)why, u);
- ASSERTCMP(u, !=, -1);
- if (u == 0) {
- _debug("- kill object OBJ%x", object->fscache.debug_id);
-
- ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
- ASSERTCMP(object->fscache.parent, ==, NULL);
- ASSERTCMP(object->backer, ==, NULL);
- ASSERTCMP(object->dentry, ==, NULL);
- ASSERTCMP(object->fscache.n_ops, ==, 0);
- ASSERTCMP(object->fscache.n_children, ==, 0);
-
- if (object->lookup_data) {
- kfree(object->lookup_data->key);
- kfree(object->lookup_data->auxdata);
- kfree(object->lookup_data);
- object->lookup_data = NULL;
- }
-
- cache = object->fscache.cache;
- fscache_object_destroy(&object->fscache);
- kmem_cache_free(cachefiles_object_jar, object);
- fscache_object_destroyed(cache);
- }
-
- _leave("");
-}
-
-/*
- * sync a cache
- */
-static void cachefiles_sync_cache(struct fscache_cache *_cache)
-{
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- int ret;
-
- _enter("%s", _cache->tag->name);
-
- cache = container_of(_cache, struct cachefiles_cache, cache);
-
- /* make sure all pages pinned by operations on behalf of the netfs are
- * written to disc */
- cachefiles_begin_secure(cache, &saved_cred);
- down_read(&cache->mnt->mnt_sb->s_umount);
- ret = sync_filesystem(cache->mnt->mnt_sb);
- up_read(&cache->mnt->mnt_sb->s_umount);
- cachefiles_end_secure(cache, saved_cred);
-
- if (ret == -EIO)
- cachefiles_io_error(cache,
- "Attempt to sync backing fs superblock"
- " returned error %d",
- ret);
-}
-
-/*
- * check if the backing cache is updated to FS-Cache
- * - called by FS-Cache when evaluates if need to invalidate the cache
- */
-static int cachefiles_check_consistency(struct fscache_operation *op)
-{
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- int ret;
-
- _enter("{OBJ%x}", op->object->debug_id);
-
- object = container_of(op->object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
-
- cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_check_auxdata(object);
- cachefiles_end_secure(cache, saved_cred);
-
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * notification the attributes on an object have changed
- * - called with reads/writes excluded by FS-Cache
- */
-static int cachefiles_attr_changed(struct fscache_object *_object)
-{
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- struct iattr newattrs;
- uint64_t ni_size;
- loff_t oi_size;
- int ret;
-
- ni_size = _object->store_limit_l;
-
- _enter("{OBJ%x},[%llu]",
- _object->debug_id, (unsigned long long) ni_size);
-
- object = container_of(_object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
-
- if (ni_size == object->i_size)
- return 0;
-
- if (!object->backer)
- return -ENOBUFS;
-
- ASSERT(d_is_reg(object->backer));
-
- fscache_set_store_limit(&object->fscache, ni_size);
-
- oi_size = i_size_read(d_backing_inode(object->backer));
- if (oi_size == ni_size)
- return 0;
-
- cachefiles_begin_secure(cache, &saved_cred);
- inode_lock(d_inode(object->backer));
-
- /* if there's an extension to a partial page at the end of the backing
- * file, we need to discard the partial page so that we pick up new
- * data after it */
- if (oi_size & ~PAGE_MASK && ni_size > oi_size) {
- _debug("discard tail %llx", oi_size);
- newattrs.ia_valid = ATTR_SIZE;
- newattrs.ia_size = oi_size & PAGE_MASK;
- ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
- if (ret < 0)
- goto truncate_failed;
- }
-
- newattrs.ia_valid = ATTR_SIZE;
- newattrs.ia_size = ni_size;
- ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
-
-truncate_failed:
- inode_unlock(d_inode(object->backer));
- cachefiles_end_secure(cache, saved_cred);
-
- if (ret == -EIO) {
- fscache_set_store_limit(&object->fscache, 0);
- cachefiles_io_error_obj(object, "Size set failed");
- ret = -ENOBUFS;
- }
-
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * Invalidate an object
- */
-static void cachefiles_invalidate_object(struct fscache_operation *op)
-{
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- struct path path;
- uint64_t ni_size;
- int ret;
-
- object = container_of(op->object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
-
- ni_size = op->object->store_limit_l;
-
- _enter("{OBJ%x},[%llu]",
- op->object->debug_id, (unsigned long long)ni_size);
-
- if (object->backer) {
- ASSERT(d_is_reg(object->backer));
-
- fscache_set_store_limit(&object->fscache, ni_size);
-
- path.dentry = object->backer;
- path.mnt = cache->mnt;
-
- cachefiles_begin_secure(cache, &saved_cred);
- ret = vfs_truncate(&path, 0);
- if (ret == 0)
- ret = vfs_truncate(&path, ni_size);
- cachefiles_end_secure(cache, saved_cred);
-
- if (ret != 0) {
- fscache_set_store_limit(&object->fscache, 0);
- if (ret == -EIO)
- cachefiles_io_error_obj(object,
- "Invalidate failed");
- }
- }
-
- fscache_op_complete(op, true);
- _leave("");
-}
-
-const struct fscache_cache_ops cachefiles_cache_ops = {
- .name = "cachefiles",
- .alloc_object = cachefiles_alloc_object,
- .lookup_object = cachefiles_lookup_object,
- .lookup_complete = cachefiles_lookup_complete,
- .grab_object = cachefiles_grab_object,
- .update_object = cachefiles_update_object,
- .invalidate_object = cachefiles_invalidate_object,
- .drop_object = cachefiles_drop_object,
- .put_object = cachefiles_put_object,
- .sync_cache = cachefiles_sync_cache,
- .attr_changed = cachefiles_attr_changed,
- .check_consistency = cachefiles_check_consistency,
- .begin_operation = cachefiles_begin_operation,
-};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
deleted file mode 100644
index 7dee24d1c6f2..000000000000
--- a/fs/cachefiles/internal.h
+++ /dev/null
@@ -1,312 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* General netfs cache on cache files internal defs
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#ifdef pr_fmt
-#undef pr_fmt
-#endif
-
-#define pr_fmt(fmt) "CacheFiles: " fmt
-
-
-#include <linux/fscache_old-cache.h>
-#include <linux/timer.h>
-#include <linux/wait_bit.h>
-#include <linux/cred.h>
-#include <linux/workqueue.h>
-#include <linux/security.h>
-
-struct cachefiles_cache;
-struct cachefiles_object;
-
-extern unsigned cachefiles_debug;
-#define CACHEFILES_DEBUG_KENTER 1
-#define CACHEFILES_DEBUG_KLEAVE 2
-#define CACHEFILES_DEBUG_KDEBUG 4
-
-#define cachefiles_gfp (__GFP_RECLAIM | __GFP_NORETRY | __GFP_NOMEMALLOC)
-
-/*
- * node records
- */
-struct cachefiles_object {
- struct fscache_object fscache; /* fscache handle */
- struct cachefiles_lookup_data *lookup_data; /* cached lookup data */
- struct dentry *dentry; /* the file/dir representing this object */
- struct dentry *backer; /* backing file */
- loff_t i_size; /* object size */
- unsigned long flags;
-#define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */
- atomic_t usage; /* object usage count */
- uint8_t type; /* object type */
- uint8_t new; /* T if object new */
- struct rb_node active_node; /* link in active tree (dentry is key) */
-};
-
-extern struct kmem_cache *cachefiles_object_jar;
-
-/*
- * Cache files cache definition
- */
-struct cachefiles_cache {
- struct fscache_cache cache; /* FS-Cache record */
- struct vfsmount *mnt; /* mountpoint holding the cache */
- struct dentry *graveyard; /* directory into which dead objects go */
- struct file *cachefilesd; /* manager daemon handle */
- const struct cred *cache_cred; /* security override for accessing cache */
- struct mutex daemon_mutex; /* command serialisation mutex */
- wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
- struct rb_root active_nodes; /* active nodes (can't be culled) */
- rwlock_t active_lock; /* lock for active_nodes */
- atomic_t gravecounter; /* graveyard uniquifier */
- atomic_t f_released; /* number of objects released lately */
- atomic_long_t b_released; /* number of blocks released lately */
- unsigned frun_percent; /* when to stop culling (% files) */
- unsigned fcull_percent; /* when to start culling (% files) */
- unsigned fstop_percent; /* when to stop allocating (% files) */
- unsigned brun_percent; /* when to stop culling (% blocks) */
- unsigned bcull_percent; /* when to start culling (% blocks) */
- unsigned bstop_percent; /* when to stop allocating (% blocks) */
- unsigned bsize; /* cache's block size */
- unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
- uint64_t frun; /* when to stop culling */
- uint64_t fcull; /* when to start culling */
- uint64_t fstop; /* when to stop allocating */
- sector_t brun; /* when to stop culling */
- sector_t bcull; /* when to start culling */
- sector_t bstop; /* when to stop allocating */
- unsigned long flags;
-#define CACHEFILES_READY 0 /* T if cache prepared */
-#define CACHEFILES_DEAD 1 /* T if cache dead */
-#define CACHEFILES_CULLING 2 /* T if cull engaged */
-#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
- char *rootdirname; /* name of cache root directory */
- char *secctx; /* LSM security context */
- char *tag; /* cache binding tag */
-};
-
-/*
- * auxiliary data xattr buffer
- */
-struct cachefiles_xattr {
- uint16_t len;
- uint8_t type;
- uint8_t data[];
-};
-
-#include <trace/events/cachefiles.h>
-
-/*
- * note change of state for daemon
- */
-static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
-{
- set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
- wake_up_all(&cache->daemon_pollwq);
-}
-
-/*
- * bind.c
- */
-extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args);
-extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
-
-/*
- * daemon.c
- */
-extern const struct file_operations cachefiles_daemon_fops;
-
-extern int cachefiles_has_space(struct cachefiles_cache *cache,
- unsigned fnr, unsigned bnr);
-
-/*
- * interface.c
- */
-extern const struct fscache_cache_ops cachefiles_cache_ops;
-
-void cachefiles_put_object(struct fscache_object *_object,
- enum fscache_obj_ref_trace why);
-
-/*
- * key.c
- */
-extern char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type);
-
-/*
- * namei.c
- */
-extern void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
- struct cachefiles_object *object,
- blkcnt_t i_blocks);
-extern int cachefiles_delete_object(struct cachefiles_cache *cache,
- struct cachefiles_object *object);
-extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
- struct cachefiles_object *object,
- const char *key,
- struct cachefiles_xattr *auxdata);
-extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
- struct dentry *dir,
- const char *name);
-
-extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
- char *filename);
-
-extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
- struct dentry *dir, char *filename);
-
-/*
- * rdwr2.c
- */
-extern int cachefiles_begin_operation(struct netfs_cache_resources *,
- struct fscache_operation *);
-
-/*
- * security.c
- */
-extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
-extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
- struct dentry *root,
- const struct cred **_saved_cred);
-
-static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
- const struct cred **_saved_cred)
-{
- *_saved_cred = override_creds(cache->cache_cred);
-}
-
-static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
- const struct cred *saved_cred)
-{
- revert_creds(saved_cred);
-}
-
-/*
- * xattr.c
- */
-extern int cachefiles_check_object_type(struct cachefiles_object *object);
-extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
- struct cachefiles_xattr *auxdata);
-extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
- struct cachefiles_xattr *auxdata);
-extern int cachefiles_check_auxdata(struct cachefiles_object *object);
-extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
- struct cachefiles_xattr *auxdata);
-extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
- struct dentry *dentry);
-
-
-/*
- * error handling
- */
-
-#define cachefiles_io_error(___cache, FMT, ...) \
-do { \
- pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \
- fscache_io_error(&(___cache)->cache); \
- set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
-} while (0)
-
-#define cachefiles_io_error_obj(object, FMT, ...) \
-do { \
- struct cachefiles_cache *___cache; \
- \
- ___cache = container_of((object)->fscache.cache, \
- struct cachefiles_cache, cache); \
- cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
-} while (0)
-
-
-/*
- * debug tracing
- */
-#define dbgprintk(FMT, ...) \
- printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
-
-#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
-#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
-#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
-
-
-#if defined(__KDEBUG)
-#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
-#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
-#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
-
-#elif defined(CONFIG_CACHEFILES_DEBUG)
-#define _enter(FMT, ...) \
-do { \
- if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
- kenter(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#define _leave(FMT, ...) \
-do { \
- if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
- kleave(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#define _debug(FMT, ...) \
-do { \
- if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
- kdebug(FMT, ##__VA_ARGS__); \
-} while (0)
-
-#else
-#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
-#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
-#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
-#endif
-
-#if 1 /* defined(__KDEBUGALL) */
-
-#define ASSERT(X) \
-do { \
- if (unlikely(!(X))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTCMP(X, OP, Y) \
-do { \
- if (unlikely(!((X) OP (Y)))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- pr_err("%lx " #OP " %lx is false\n", \
- (unsigned long)(X), (unsigned long)(Y)); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTIF(C, X) \
-do { \
- if (unlikely((C) && !(X))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- BUG(); \
- } \
-} while (0)
-
-#define ASSERTIFCMP(C, X, OP, Y) \
-do { \
- if (unlikely((C) && !((X) OP (Y)))) { \
- pr_err("\n"); \
- pr_err("Assertion failed\n"); \
- pr_err("%lx " #OP " %lx is false\n", \
- (unsigned long)(X), (unsigned long)(Y)); \
- BUG(); \
- } \
-} while (0)
-
-#else
-
-#define ASSERT(X) do {} while (0)
-#define ASSERTCMP(X, OP, Y) do {} while (0)
-#define ASSERTIF(C, X) do {} while (0)
-#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
-
-#endif
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
deleted file mode 100644
index 5ead97de4bb7..000000000000
--- a/fs/cachefiles/io.c
+++ /dev/null
@@ -1,445 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* kiocb-using read/write
- *
- * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/mount.h>
-#include <linux/slab.h>
-#include <linux/file.h>
-#include <linux/uio.h>
-#include <linux/sched/mm.h>
-#include <linux/netfs.h>
-#include "internal.h"
-
-struct cachefiles_kiocb {
- struct kiocb iocb;
- refcount_t ki_refcnt;
- loff_t start;
- union {
- size_t skipped;
- size_t len;
- };
- netfs_io_terminated_t term_func;
- void *term_func_priv;
- bool was_async;
-};
-
-static inline void cachefiles_put_kiocb(struct cachefiles_kiocb *ki)
-{
- if (refcount_dec_and_test(&ki->ki_refcnt)) {
- fput(ki->iocb.ki_filp);
- kfree(ki);
- }
-}
-
-/*
- * Handle completion of a read from the cache.
- */
-static void cachefiles_read_complete(struct kiocb *iocb, long ret, long ret2)
-{
- struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb);
-
- _enter("%ld,%ld", ret, ret2);
-
- if (ki->term_func) {
- if (ret >= 0)
- ret += ki->skipped;
- ki->term_func(ki->term_func_priv, ret, ki->was_async);
- }
-
- cachefiles_put_kiocb(ki);
-}
-
-/*
- * Initiate a read from the cache.
- */
-static int cachefiles_read(struct netfs_cache_resources *cres,
- loff_t start_pos,
- struct iov_iter *iter,
- enum netfs_read_from_hole read_hole,
- netfs_io_terminated_t term_func,
- void *term_func_priv)
-{
- struct cachefiles_kiocb *ki;
- struct file *file = cres->cache_priv2;
- unsigned int old_nofs;
- ssize_t ret = -ENODATA;
- size_t len = iov_iter_count(iter), skipped = 0;
-
- _enter("%pD,%li,%llx,%zx/%llx",
- file, file_inode(file)->i_ino, start_pos, len,
- i_size_read(file_inode(file)));
-
- /* If the caller asked us to seek for data before doing the read, then
- * we should do that now. If we find a gap, we fill it with zeros.
- */
- if (read_hole != NETFS_READ_HOLE_IGNORE) {
- loff_t off = start_pos, off2;
-
- off2 = vfs_llseek(file, off, SEEK_DATA);
- if (off2 < 0 && off2 >= (loff_t)-MAX_ERRNO && off2 != -ENXIO) {
- skipped = 0;
- ret = off2;
- goto presubmission_error;
- }
-
- if (off2 == -ENXIO || off2 >= start_pos + len) {
- /* The region is beyond the EOF or there's no more data
- * in the region, so clear the rest of the buffer and
- * return success.
- */
- if (read_hole == NETFS_READ_HOLE_FAIL)
- goto presubmission_error;
-
- iov_iter_zero(len, iter);
- skipped = len;
- ret = 0;
- goto presubmission_error;
- }
-
- skipped = off2 - off;
- iov_iter_zero(skipped, iter);
- }
-
- ret = -ENOBUFS;
- ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
- if (!ki)
- goto presubmission_error;
-
- refcount_set(&ki->ki_refcnt, 2);
- ki->iocb.ki_filp = file;
- ki->iocb.ki_pos = start_pos + skipped;
- ki->iocb.ki_flags = IOCB_DIRECT;
- ki->iocb.ki_hint = ki_hint_validate(file_write_hint(file));
- ki->iocb.ki_ioprio = get_current_ioprio();
- ki->skipped = skipped;
- ki->term_func = term_func;
- ki->term_func_priv = term_func_priv;
- ki->was_async = true;
-
- if (ki->term_func)
- ki->iocb.ki_complete = cachefiles_read_complete;
-
- get_file(ki->iocb.ki_filp);
-
- old_nofs = memalloc_nofs_save();
- ret = vfs_iocb_iter_read(file, &ki->iocb, iter);
- memalloc_nofs_restore(old_nofs);
- switch (ret) {
- case -EIOCBQUEUED:
- goto in_progress;
-
- case -ERESTARTSYS:
- case -ERESTARTNOINTR:
- case -ERESTARTNOHAND:
- case -ERESTART_RESTARTBLOCK:
- /* There's no easy way to restart the syscall since other AIO's
- * may be already running. Just fail this IO with EINTR.
- */
- ret = -EINTR;
- fallthrough;
- default:
- ki->was_async = false;
- cachefiles_read_complete(&ki->iocb, ret, 0);
- if (ret > 0)
- ret = 0;
- break;
- }
-
-in_progress:
- cachefiles_put_kiocb(ki);
- _leave(" = %zd", ret);
- return ret;
-
-presubmission_error:
- if (term_func)
- term_func(term_func_priv, ret < 0 ? ret : skipped, false);
- return ret;
-}
-
-/*
- * Handle completion of a write to the cache.
- */
-static void cachefiles_write_complete(struct kiocb *iocb, long ret, long ret2)
-{
- struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb);
- struct inode *inode = file_inode(ki->iocb.ki_filp);
-
- _enter("%ld,%ld", ret, ret2);
-
- /* Tell lockdep we inherited freeze protection from submission thread */
- __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
- __sb_end_write(inode->i_sb, SB_FREEZE_WRITE);
-
- if (ki->term_func)
- ki->term_func(ki->term_func_priv, ret, ki->was_async);
-
- cachefiles_put_kiocb(ki);
-}
-
-/*
- * Initiate a write to the cache.
- */
-static int cachefiles_write(struct netfs_cache_resources *cres,
- loff_t start_pos,
- struct iov_iter *iter,
- netfs_io_terminated_t term_func,
- void *term_func_priv)
-{
- struct cachefiles_kiocb *ki;
- struct inode *inode;
- struct file *file = cres->cache_priv2;
- unsigned int old_nofs;
- ssize_t ret = -ENOBUFS;
- size_t len = iov_iter_count(iter);
-
- _enter("%pD,%li,%llx,%zx/%llx",
- file, file_inode(file)->i_ino, start_pos, len,
- i_size_read(file_inode(file)));
-
- ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
- if (!ki)
- goto presubmission_error;
-
- refcount_set(&ki->ki_refcnt, 2);
- ki->iocb.ki_filp = file;
- ki->iocb.ki_pos = start_pos;
- ki->iocb.ki_flags = IOCB_DIRECT | IOCB_WRITE;
- ki->iocb.ki_hint = ki_hint_validate(file_write_hint(file));
- ki->iocb.ki_ioprio = get_current_ioprio();
- ki->start = start_pos;
- ki->len = len;
- ki->term_func = term_func;
- ki->term_func_priv = term_func_priv;
- ki->was_async = true;
-
- if (ki->term_func)
- ki->iocb.ki_complete = cachefiles_write_complete;
-
- /* Open-code file_start_write here to grab freeze protection, which
- * will be released by another thread in aio_complete_rw(). Fool
- * lockdep by telling it the lock got released so that it doesn't
- * complain about the held lock when we return to userspace.
- */
- inode = file_inode(file);
- __sb_start_write(inode->i_sb, SB_FREEZE_WRITE);
- __sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);
-
- get_file(ki->iocb.ki_filp);
-
- old_nofs = memalloc_nofs_save();
- ret = vfs_iocb_iter_write(file, &ki->iocb, iter);
- memalloc_nofs_restore(old_nofs);
- switch (ret) {
- case -EIOCBQUEUED:
- goto in_progress;
-
- case -ERESTARTSYS:
- case -ERESTARTNOINTR:
- case -ERESTARTNOHAND:
- case -ERESTART_RESTARTBLOCK:
- /* There's no easy way to restart the syscall since other AIO's
- * may be already running. Just fail this IO with EINTR.
- */
- ret = -EINTR;
- fallthrough;
- default:
- ki->was_async = false;
- cachefiles_write_complete(&ki->iocb, ret, 0);
- if (ret > 0)
- ret = 0;
- break;
- }
-
-in_progress:
- cachefiles_put_kiocb(ki);
- _leave(" = %zd", ret);
- return ret;
-
-presubmission_error:
- if (term_func)
- term_func(term_func_priv, -ENOMEM, false);
- return -ENOMEM;
-}
-
-/*
- * Prepare a read operation, shortening it to a cached/uncached
- * boundary as appropriate.
- */
-static enum netfs_read_source cachefiles_prepare_read(struct netfs_read_subrequest *subreq,
- loff_t i_size)
-{
- struct fscache_operation *op = subreq->rreq->cache_resources.cache_priv;
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- const struct cred *saved_cred;
- struct file *file = subreq->rreq->cache_resources.cache_priv2;
- enum netfs_read_source ret = NETFS_DOWNLOAD_FROM_SERVER;
- loff_t off, to;
-
- _enter("%zx @%llx/%llx", subreq->len, subreq->start, i_size);
-
- object = container_of(op->object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
-
- cachefiles_begin_secure(cache, &saved_cred);
-
- if (subreq->start >= i_size) {
- ret = NETFS_FILL_WITH_ZEROES;
- goto out;
- }
-
- if (!file)
- goto out;
-
- if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->fscache.cookie->flags))
- goto download_and_store;
-
- off = vfs_llseek(file, subreq->start, SEEK_DATA);
- if (off < 0 && off >= (loff_t)-MAX_ERRNO) {
- if (off == (loff_t)-ENXIO)
- goto download_and_store;
- goto out;
- }
-
- if (off >= subreq->start + subreq->len)
- goto download_and_store;
-
- if (off > subreq->start) {
- off = round_up(off, cache->bsize);
- subreq->len = off - subreq->start;
- goto download_and_store;
- }
-
- to = vfs_llseek(file, subreq->start, SEEK_HOLE);
- if (to < 0 && to >= (loff_t)-MAX_ERRNO)
- goto out;
-
- if (to < subreq->start + subreq->len) {
- if (subreq->start + subreq->len >= i_size)
- to = round_up(to, cache->bsize);
- else
- to = round_down(to, cache->bsize);
- subreq->len = to - subreq->start;
- }
-
- ret = NETFS_READ_FROM_CACHE;
- goto out;
-
-download_and_store:
- if (cachefiles_has_space(cache, 0, (subreq->len + PAGE_SIZE - 1) / PAGE_SIZE) == 0)
- __set_bit(NETFS_SREQ_WRITE_TO_CACHE, &subreq->flags);
-out:
- cachefiles_end_secure(cache, saved_cred);
- return ret;
-}
-
-/*
- * Prepare for a write to occur.
- */
-static int cachefiles_prepare_write(struct netfs_cache_resources *cres,
- loff_t *_start, size_t *_len, loff_t i_size)
-{
- loff_t start = *_start;
- size_t len = *_len, down;
-
- /* Round to DIO size */
- down = start - round_down(start, PAGE_SIZE);
- *_start = start - down;
- *_len = round_up(down + len, PAGE_SIZE);
- return 0;
-}
-
-/*
- * Prepare for a write to occur from the fallback I/O API.
- */
-static int cachefiles_prepare_fallback_write(struct netfs_cache_resources *cres,
- pgoff_t index)
-{
- struct fscache_operation *op = cres->cache_priv;
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
-
- _enter("%lx", index);
-
- object = container_of(op->object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
- return cachefiles_has_space(cache, 0, 1);
-}
-
-/*
- * Clean up an operation.
- */
-static void cachefiles_end_operation(struct netfs_cache_resources *cres)
-{
- struct fscache_operation *op = cres->cache_priv;
- struct file *file = cres->cache_priv2;
-
- _enter("");
-
- if (file)
- fput(file);
- if (op) {
- fscache_op_complete(op, false);
- fscache_put_operation(op);
- }
-
- _leave("");
-}
-
-static const struct netfs_cache_ops cachefiles_netfs_cache_ops = {
- .end_operation = cachefiles_end_operation,
- .read = cachefiles_read,
- .write = cachefiles_write,
- .prepare_read = cachefiles_prepare_read,
- .prepare_write = cachefiles_prepare_write,
- .prepare_fallback_write = cachefiles_prepare_fallback_write,
-};
-
-/*
- * Open the cache file when beginning a cache operation.
- */
-int cachefiles_begin_operation(struct netfs_cache_resources *cres,
- struct fscache_operation *op)
-{
- struct cachefiles_object *object;
- struct cachefiles_cache *cache;
- struct path path;
- struct file *file;
-
- _enter("");
-
- object = container_of(op->object, struct cachefiles_object, fscache);
- cache = container_of(object->fscache.cache,
- struct cachefiles_cache, cache);
-
- path.mnt = cache->mnt;
- path.dentry = object->backer;
- file = open_with_fake_path(&path, O_RDWR | O_LARGEFILE | O_DIRECT,
- d_inode(object->backer), cache->cache_cred);
- if (IS_ERR(file))
- return PTR_ERR(file);
- if (!S_ISREG(file_inode(file)->i_mode))
- goto error_file;
- if (unlikely(!file->f_op->read_iter) ||
- unlikely(!file->f_op->write_iter)) {
- pr_notice("Cache does not support read_iter and write_iter\n");
- goto error_file;
- }
-
- atomic_inc(&op->usage);
- cres->cache_priv = op;
- cres->cache_priv2 = file;
- cres->ops = &cachefiles_netfs_cache_ops;
- cres->debug_id = object->fscache.debug_id;
- _leave("");
- return 0;
-
-error_file:
- fput(file);
- return -EIO;
-}
diff --git a/fs/cachefiles/key.c b/fs/cachefiles/key.c
deleted file mode 100644
index 7f94efc97e23..000000000000
--- a/fs/cachefiles/key.c
+++ /dev/null
@@ -1,155 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Key to pathname encoder
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/slab.h>
-#include "internal.h"
-
-static const char cachefiles_charmap[64] =
- "0123456789" /* 0 - 9 */
- "abcdefghijklmnopqrstuvwxyz" /* 10 - 35 */
- "ABCDEFGHIJKLMNOPQRSTUVWXYZ" /* 36 - 61 */
- "_-" /* 62 - 63 */
- ;
-
-static const char cachefiles_filecharmap[256] = {
- /* we skip space and tab and control chars */
- [33 ... 46] = 1, /* '!' -> '.' */
- /* we skip '/' as it's significant to pathwalk */
- [48 ... 127] = 1, /* '0' -> '~' */
-};
-
-/*
- * turn the raw key into something cooked
- * - the raw key should include the length in the two bytes at the front
- * - the key may be up to 514 bytes in length (including the length word)
- * - "base64" encode the strange keys, mapping 3 bytes of raw to four of
- * cooked
- * - need to cut the cooked key into 252 char lengths (189 raw bytes)
- */
-char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type)
-{
- unsigned char csum, ch;
- unsigned int acc;
- char *key;
- int loop, len, max, seg, mark, print;
-
- _enter(",%d", keylen);
-
- BUG_ON(keylen < 2 || keylen > 514);
-
- csum = raw[0] + raw[1];
- print = 1;
- for (loop = 2; loop < keylen; loop++) {
- ch = raw[loop];
- csum += ch;
- print &= cachefiles_filecharmap[ch];
- }
-
- if (print) {
- /* if the path is usable ASCII, then we render it directly */
- max = keylen - 2;
- max += 2; /* two base64'd length chars on the front */
- max += 5; /* @checksum/M */
- max += 3 * 2; /* maximum number of segment dividers (".../M")
- * is ((514 + 251) / 252) = 3
- */
- max += 1; /* NUL on end */
- } else {
- /* calculate the maximum length of the cooked key */
- keylen = (keylen + 2) / 3;
-
- max = keylen * 4;
- max += 5; /* @checksum/M */
- max += 3 * 2; /* maximum number of segment dividers (".../M")
- * is ((514 + 188) / 189) = 3
- */
- max += 1; /* NUL on end */
- }
-
- max += 1; /* 2nd NUL on end */
-
- _debug("max: %d", max);
-
- key = kmalloc(max, cachefiles_gfp);
- if (!key)
- return NULL;
-
- len = 0;
-
- /* build the cooked key */
- sprintf(key, "@%02x%c+", (unsigned) csum, 0);
- len = 5;
- mark = len - 1;
-
- if (print) {
- acc = *(uint16_t *) raw;
- raw += 2;
-
- key[len + 1] = cachefiles_charmap[acc & 63];
- acc >>= 6;
- key[len] = cachefiles_charmap[acc & 63];
- len += 2;
-
- seg = 250;
- for (loop = keylen; loop > 0; loop--) {
- if (seg <= 0) {
- key[len++] = '\0';
- mark = len;
- key[len++] = '+';
- seg = 252;
- }
-
- key[len++] = *raw++;
- ASSERT(len < max);
- }
-
- switch (type) {
- case FSCACHE_COOKIE_TYPE_INDEX: type = 'I'; break;
- case FSCACHE_COOKIE_TYPE_DATAFILE: type = 'D'; break;
- default: type = 'S'; break;
- }
- } else {
- seg = 252;
- for (loop = keylen; loop > 0; loop--) {
- if (seg <= 0) {
- key[len++] = '\0';
- mark = len;
- key[len++] = '+';
- seg = 252;
- }
-
- acc = *raw++;
- acc |= *raw++ << 8;
- acc |= *raw++ << 16;
-
- _debug("acc: %06x", acc);
-
- key[len++] = cachefiles_charmap[acc & 63];
- acc >>= 6;
- key[len++] = cachefiles_charmap[acc & 63];
- acc >>= 6;
- key[len++] = cachefiles_charmap[acc & 63];
- acc >>= 6;
- key[len++] = cachefiles_charmap[acc & 63];
-
- ASSERT(len < max);
- }
-
- switch (type) {
- case FSCACHE_COOKIE_TYPE_INDEX: type = 'J'; break;
- case FSCACHE_COOKIE_TYPE_DATAFILE: type = 'E'; break;
- default: type = 'T'; break;
- }
- }
-
- key[mark] = type;
- key[len++] = 0;
- key[len] = 0;
-
- _leave(" = %s %d", key, len);
- return key;
-}
diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c
deleted file mode 100644
index d3115106b22b..000000000000
--- a/fs/cachefiles/main.c
+++ /dev/null
@@ -1,94 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* Network filesystem caching backend to use cache files on a premounted
- * filesystem
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/namei.h>
-#include <linux/mount.h>
-#include <linux/statfs.h>
-#include <linux/sysctl.h>
-#include <linux/miscdevice.h>
-#define CREATE_TRACE_POINTS
-#include "internal.h"
-
-unsigned cachefiles_debug;
-module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
-
-MODULE_DESCRIPTION("Mounted-filesystem based cache");
-MODULE_AUTHOR("Red Hat, Inc.");
-MODULE_LICENSE("GPL");
-
-struct kmem_cache *cachefiles_object_jar;
-
-static struct miscdevice cachefiles_dev = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "cachefiles",
- .fops = &cachefiles_daemon_fops,
-};
-
-static void cachefiles_object_init_once(void *_object)
-{
- struct cachefiles_object *object = _object;
-
- memset(object, 0, sizeof(*object));
-}
-
-/*
- * initialise the fs caching module
- */
-static int __init cachefiles_init(void)
-{
- int ret;
-
- ret = misc_register(&cachefiles_dev);
- if (ret < 0)
- goto error_dev;
-
- /* create an object jar */
- ret = -ENOMEM;
- cachefiles_object_jar =
- kmem_cache_create("cachefiles_object_jar",
- sizeof(struct cachefiles_object),
- 0,
- SLAB_HWCACHE_ALIGN,
- cachefiles_object_init_once);
- if (!cachefiles_object_jar) {
- pr_notice("Failed to allocate an object jar\n");
- goto error_object_jar;
- }
-
- pr_info("Loaded\n");
- return 0;
-
-error_object_jar:
- misc_deregister(&cachefiles_dev);
-error_dev:
- pr_err("failed to register: %d\n", ret);
- return ret;
-}
-
-fs_initcall(cachefiles_init);
-
-/*
- * clean up on module removal
- */
-static void __exit cachefiles_exit(void)
-{
- pr_info("Unloading\n");
-
- kmem_cache_destroy(cachefiles_object_jar);
- misc_deregister(&cachefiles_dev);
-}
-
-module_exit(cachefiles_exit);
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
deleted file mode 100644
index a9aca5ab5970..000000000000
--- a/fs/cachefiles/namei.c
+++ /dev/null
@@ -1,1018 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* CacheFiles path walking and related routines
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/fsnotify.h>
-#include <linux/quotaops.h>
-#include <linux/xattr.h>
-#include <linux/mount.h>
-#include <linux/namei.h>
-#include <linux/security.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-#define CACHEFILES_KEYBUF_SIZE 512
-
-/*
- * dump debugging info about an object
- */
-static noinline
-void __cachefiles_printk_object(struct cachefiles_object *object,
- const char *prefix)
-{
- struct fscache_cookie *cookie;
- const u8 *k;
- unsigned loop;
-
- pr_err("%sobject: OBJ%x\n", prefix, object->fscache.debug_id);
- pr_err("%sobjstate=%s fl=%lx wbusy=%x ev=%lx[%lx]\n",
- prefix, object->fscache.state->name,
- object->fscache.flags, work_busy(&object->fscache.work),
- object->fscache.events, object->fscache.event_mask);
- pr_err("%sops=%u inp=%u exc=%u\n",
- prefix, object->fscache.n_ops, object->fscache.n_in_progress,
- object->fscache.n_exclusive);
- pr_err("%sparent=%x\n",
- prefix, object->fscache.parent ? object->fscache.parent->debug_id : 0);
-
- spin_lock(&object->fscache.lock);
- cookie = object->fscache.cookie;
- if (cookie) {
- pr_err("%scookie=%x [pr=%x nd=%p fl=%lx]\n",
- prefix,
- cookie->debug_id,
- cookie->parent ? cookie->parent->debug_id : 0,
- cookie->netfs_data,
- cookie->flags);
- pr_err("%skey=[%u] '", prefix, cookie->key_len);
- k = (cookie->key_len <= sizeof(cookie->inline_key)) ?
- cookie->inline_key : cookie->key;
- for (loop = 0; loop < cookie->key_len; loop++)
- pr_cont("%02x", k[loop]);
- pr_cont("'\n");
- } else {
- pr_err("%scookie=NULL\n", prefix);
- }
- spin_unlock(&object->fscache.lock);
-}
-
-/*
- * dump debugging info about a pair of objects
- */
-static noinline void cachefiles_printk_object(struct cachefiles_object *object,
- struct cachefiles_object *xobject)
-{
- if (object)
- __cachefiles_printk_object(object, "");
- if (xobject)
- __cachefiles_printk_object(xobject, "x");
-}
-
-/*
- * mark the owner of a dentry, if there is one, to indicate that that dentry
- * has been preemptively deleted
- * - the caller must hold the i_mutex on the dentry's parent as required to
- * call vfs_unlink(), vfs_rmdir() or vfs_rename()
- */
-static void cachefiles_mark_object_buried(struct cachefiles_cache *cache,
- struct dentry *dentry,
- enum fscache_why_object_killed why)
-{
- struct cachefiles_object *object;
- struct rb_node *p;
-
- _enter(",'%pd'", dentry);
-
- write_lock(&cache->active_lock);
-
- p = cache->active_nodes.rb_node;
- while (p) {
- object = rb_entry(p, struct cachefiles_object, active_node);
- if (object->dentry > dentry)
- p = p->rb_left;
- else if (object->dentry < dentry)
- p = p->rb_right;
- else
- goto found_dentry;
- }
-
- write_unlock(&cache->active_lock);
- trace_cachefiles_mark_buried(NULL, dentry, why);
- _leave(" [no owner]");
- return;
-
- /* found the dentry for */
-found_dentry:
- kdebug("preemptive burial: OBJ%x [%s] %pd",
- object->fscache.debug_id,
- object->fscache.state->name,
- dentry);
-
- trace_cachefiles_mark_buried(object, dentry, why);
-
- if (fscache_object_is_live(&object->fscache)) {
- pr_err("\n");
- pr_err("Error: Can't preemptively bury live object\n");
- cachefiles_printk_object(object, NULL);
- } else {
- if (why != FSCACHE_OBJECT_IS_STALE)
- fscache_object_mark_killed(&object->fscache, why);
- }
-
- write_unlock(&cache->active_lock);
- _leave(" [owner marked]");
-}
-
-/*
- * record the fact that an object is now active
- */
-static int cachefiles_mark_object_active(struct cachefiles_cache *cache,
- struct cachefiles_object *object)
-{
- struct cachefiles_object *xobject;
- struct rb_node **_p, *_parent = NULL;
- struct dentry *dentry;
-
- _enter(",%x", object->fscache.debug_id);
-
-try_again:
- write_lock(&cache->active_lock);
-
- dentry = object->dentry;
- trace_cachefiles_mark_active(object, dentry);
-
- if (test_and_set_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)) {
- pr_err("Error: Object already active\n");
- cachefiles_printk_object(object, NULL);
- BUG();
- }
-
- _p = &cache->active_nodes.rb_node;
- while (*_p) {
- _parent = *_p;
- xobject = rb_entry(_parent,
- struct cachefiles_object, active_node);
-
- ASSERT(xobject != object);
-
- if (xobject->dentry > dentry)
- _p = &(*_p)->rb_left;
- else if (xobject->dentry < dentry)
- _p = &(*_p)->rb_right;
- else
- goto wait_for_old_object;
- }
-
- rb_link_node(&object->active_node, _parent, _p);
- rb_insert_color(&object->active_node, &cache->active_nodes);
-
- write_unlock(&cache->active_lock);
- _leave(" = 0");
- return 0;
-
- /* an old object from a previous incarnation is hogging the slot - we
- * need to wait for it to be destroyed */
-wait_for_old_object:
- trace_cachefiles_wait_active(object, dentry, xobject);
- clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
-
- if (fscache_object_is_live(&xobject->fscache)) {
- pr_err("\n");
- pr_err("Error: Unexpected object collision\n");
- cachefiles_printk_object(object, xobject);
- }
- atomic_inc(&xobject->usage);
- write_unlock(&cache->active_lock);
-
- if (test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags)) {
- wait_queue_head_t *wq;
-
- signed long timeout = 60 * HZ;
- wait_queue_entry_t wait;
- bool requeue;
-
- /* if the object we're waiting for is queued for processing,
- * then just put ourselves on the queue behind it */
- if (work_pending(&xobject->fscache.work)) {
- _debug("queue OBJ%x behind OBJ%x immediately",
- object->fscache.debug_id,
- xobject->fscache.debug_id);
- goto requeue;
- }
-
- /* otherwise we sleep until either the object we're waiting for
- * is done, or the fscache_object is congested */
- wq = bit_waitqueue(&xobject->flags, CACHEFILES_OBJECT_ACTIVE);
- init_wait(&wait);
- requeue = false;
- do {
- prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
- if (!test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags))
- break;
-
- requeue = fscache_object_sleep_till_congested(&timeout);
- } while (timeout > 0 && !requeue);
- finish_wait(wq, &wait);
-
- if (requeue &&
- test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags)) {
- _debug("queue OBJ%x behind OBJ%x after wait",
- object->fscache.debug_id,
- xobject->fscache.debug_id);
- goto requeue;
- }
-
- if (timeout <= 0) {
- pr_err("\n");
- pr_err("Error: Overlong wait for old active object to go away\n");
- cachefiles_printk_object(object, xobject);
- goto requeue;
- }
- }
-
- ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags));
-
- cache->cache.ops->put_object(&xobject->fscache,
- (enum fscache_obj_ref_trace)cachefiles_obj_put_wait_retry);
- goto try_again;
-
-requeue:
- cache->cache.ops->put_object(&xobject->fscache,
- (enum fscache_obj_ref_trace)cachefiles_obj_put_wait_timeo);
- _leave(" = -ETIMEDOUT");
- return -ETIMEDOUT;
-}
-
-/*
- * Mark an object as being inactive.
- */
-void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
- struct cachefiles_object *object,
- blkcnt_t i_blocks)
-{
- struct dentry *dentry = object->dentry;
- struct inode *inode = d_backing_inode(dentry);
-
- trace_cachefiles_mark_inactive(object, dentry, inode);
-
- write_lock(&cache->active_lock);
- rb_erase(&object->active_node, &cache->active_nodes);
- clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
- write_unlock(&cache->active_lock);
-
- wake_up_bit(&object->flags, CACHEFILES_OBJECT_ACTIVE);
-
- /* This object can now be culled, so we need to let the daemon know
- * that there is something it can remove if it needs to.
- */
- atomic_long_add(i_blocks, &cache->b_released);
- if (atomic_inc_return(&cache->f_released))
- cachefiles_state_changed(cache);
-}
-
-/*
- * delete an object representation from the cache
- * - file backed objects are unlinked
- * - directory backed objects are stuffed into the graveyard for userspace to
- * delete
- * - unlocks the directory mutex
- */
-static int cachefiles_bury_object(struct cachefiles_cache *cache,
- struct cachefiles_object *object,
- struct dentry *dir,
- struct dentry *rep,
- bool preemptive,
- enum fscache_why_object_killed why)
-{
- struct dentry *grave, *trap;
- struct path path, path_to_graveyard;
- char nbuffer[8 + 8 + 1];
- int ret;
-
- _enter(",'%pd','%pd'", dir, rep);
-
- /* non-directories can just be unlinked */
- if (!d_is_dir(rep)) {
- _debug("unlink stale object");
-
- path.mnt = cache->mnt;
- path.dentry = dir;
- ret = security_path_unlink(&path, rep);
- if (ret < 0) {
- cachefiles_io_error(cache, "Unlink security error");
- } else {
- trace_cachefiles_unlink(object, rep, why);
- ret = vfs_unlink(&init_user_ns, d_inode(dir), rep,
- NULL);
-
- if (preemptive)
- cachefiles_mark_object_buried(cache, rep, why);
- }
-
- inode_unlock(d_inode(dir));
-
- if (ret == -EIO)
- cachefiles_io_error(cache, "Unlink failed");
-
- _leave(" = %d", ret);
- return ret;
- }
-
- /* directories have to be moved to the graveyard */
- _debug("move stale object to graveyard");
- inode_unlock(d_inode(dir));
-
-try_again:
- /* first step is to make up a grave dentry in the graveyard */
- sprintf(nbuffer, "%08x%08x",
- (uint32_t) ktime_get_real_seconds(),
- (uint32_t) atomic_inc_return(&cache->gravecounter));
-
- /* do the multiway lock magic */
- trap = lock_rename(cache->graveyard, dir);
-
- /* do some checks before getting the grave dentry */
- if (rep->d_parent != dir || IS_DEADDIR(d_inode(rep))) {
- /* the entry was probably culled when we dropped the parent dir
- * lock */
- unlock_rename(cache->graveyard, dir);
- _leave(" = 0 [culled?]");
- return 0;
- }
-
- if (!d_can_lookup(cache->graveyard)) {
- unlock_rename(cache->graveyard, dir);
- cachefiles_io_error(cache, "Graveyard no longer a directory");
- return -EIO;
- }
-
- if (trap == rep) {
- unlock_rename(cache->graveyard, dir);
- cachefiles_io_error(cache, "May not make directory loop");
- return -EIO;
- }
-
- if (d_mountpoint(rep)) {
- unlock_rename(cache->graveyard, dir);
- cachefiles_io_error(cache, "Mountpoint in cache");
- return -EIO;
- }
-
- grave = lookup_one_len(nbuffer, cache->graveyard, strlen(nbuffer));
- if (IS_ERR(grave)) {
- unlock_rename(cache->graveyard, dir);
-
- if (PTR_ERR(grave) == -ENOMEM) {
- _leave(" = -ENOMEM");
- return -ENOMEM;
- }
-
- cachefiles_io_error(cache, "Lookup error %ld",
- PTR_ERR(grave));
- return -EIO;
- }
-
- if (d_is_positive(grave)) {
- unlock_rename(cache->graveyard, dir);
- dput(grave);
- grave = NULL;
- cond_resched();
- goto try_again;
- }
-
- if (d_mountpoint(grave)) {
- unlock_rename(cache->graveyard, dir);
- dput(grave);
- cachefiles_io_error(cache, "Mountpoint in graveyard");
- return -EIO;
- }
-
- /* target should not be an ancestor of source */
- if (trap == grave) {
- unlock_rename(cache->graveyard, dir);
- dput(grave);
- cachefiles_io_error(cache, "May not make directory loop");
- return -EIO;
- }
-
- /* attempt the rename */
- path.mnt = cache->mnt;
- path.dentry = dir;
- path_to_graveyard.mnt = cache->mnt;
- path_to_graveyard.dentry = cache->graveyard;
- ret = security_path_rename(&path, rep, &path_to_graveyard, grave, 0);
- if (ret < 0) {
- cachefiles_io_error(cache, "Rename security error %d", ret);
- } else {
- struct renamedata rd = {
- .old_mnt_userns = &init_user_ns,
- .old_dir = d_inode(dir),
- .old_dentry = rep,
- .new_mnt_userns = &init_user_ns,
- .new_dir = d_inode(cache->graveyard),
- .new_dentry = grave,
- };
- trace_cachefiles_rename(object, rep, grave, why);
- ret = vfs_rename(&rd);
- if (ret != 0 && ret != -ENOMEM)
- cachefiles_io_error(cache,
- "Rename failed with error %d", ret);
-
- if (preemptive)
- cachefiles_mark_object_buried(cache, rep, why);
- }
-
- unlock_rename(cache->graveyard, dir);
- dput(grave);
- _leave(" = 0");
- return 0;
-}
-
-/*
- * delete an object representation from the cache
- */
-int cachefiles_delete_object(struct cachefiles_cache *cache,
- struct cachefiles_object *object)
-{
- struct dentry *dir;
- int ret;
-
- _enter(",OBJ%x{%pd}", object->fscache.debug_id, object->dentry);
-
- ASSERT(object->dentry);
- ASSERT(d_backing_inode(object->dentry));
- ASSERT(object->dentry->d_parent);
-
- dir = dget_parent(object->dentry);
-
- inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
-
- if (test_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->fscache.flags)) {
- /* object allocation for the same key preemptively deleted this
- * object's file so that it could create its own file */
- _debug("object preemptively buried");
- inode_unlock(d_inode(dir));
- ret = 0;
- } else {
- /* we need to check that our parent is _still_ our parent - it
- * may have been renamed */
- if (dir == object->dentry->d_parent) {
- ret = cachefiles_bury_object(cache, object, dir,
- object->dentry, false,
- FSCACHE_OBJECT_WAS_RETIRED);
- } else {
- /* it got moved, presumably by cachefilesd culling it,
- * so it's no longer in the key path and we can ignore
- * it */
- inode_unlock(d_inode(dir));
- ret = 0;
- }
- }
-
- dput(dir);
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * walk from the parent object to the child object through the backing
- * filesystem, creating directories as we go
- */
-int cachefiles_walk_to_object(struct cachefiles_object *parent,
- struct cachefiles_object *object,
- const char *key,
- struct cachefiles_xattr *auxdata)
-{
- struct cachefiles_cache *cache;
- struct dentry *dir, *next = NULL;
- struct inode *inode;
- struct path path;
- const char *name;
- int ret, nlen;
-
- _enter("OBJ%x{%pd},OBJ%x,%s,",
- parent->fscache.debug_id, parent->dentry,
- object->fscache.debug_id, key);
-
- cache = container_of(parent->fscache.cache,
- struct cachefiles_cache, cache);
- path.mnt = cache->mnt;
-
- ASSERT(parent->dentry);
- ASSERT(d_backing_inode(parent->dentry));
-
- if (!(d_is_dir(parent->dentry))) {
- // TODO: convert file to dir
- _leave("looking up in none directory");
- return -ENOBUFS;
- }
-
- dir = dget(parent->dentry);
-
-advance:
- /* attempt to transit the first directory component */
- name = key;
- nlen = strlen(key);
-
- /* key ends in a double NUL */
- key = key + nlen + 1;
- if (!*key)
- key = NULL;
-
-lookup_again:
- /* search the current directory for the element name */
- _debug("lookup '%s'", name);
-
- inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
-
- next = lookup_one_len(name, dir, nlen);
- if (IS_ERR(next)) {
- trace_cachefiles_lookup(object, next, NULL);
- goto lookup_error;
- }
-
- inode = d_backing_inode(next);
- trace_cachefiles_lookup(object, next, inode);
- _debug("next -> %pd %s", next, inode ? "positive" : "negative");
-
- if (!key)
- object->new = !inode;
-
- /* if this element of the path doesn't exist, then the lookup phase
- * failed, and we can release any readers in the certain knowledge that
- * there's nothing for them to actually read */
- if (d_is_negative(next))
- fscache_object_lookup_negative(&object->fscache);
-
- /* we need to create the object if it's negative */
- if (key || object->type == FSCACHE_COOKIE_TYPE_INDEX) {
- /* index objects and intervening tree levels must be subdirs */
- if (d_is_negative(next)) {
- ret = cachefiles_has_space(cache, 1, 0);
- if (ret < 0)
- goto no_space_error;
-
- path.dentry = dir;
- ret = security_path_mkdir(&path, next, 0);
- if (ret < 0)
- goto create_error;
- ret = vfs_mkdir(&init_user_ns, d_inode(dir), next, 0);
- if (!key)
- trace_cachefiles_mkdir(object, next, ret);
- if (ret < 0)
- goto create_error;
-
- if (unlikely(d_unhashed(next))) {
- dput(next);
- inode_unlock(d_inode(dir));
- goto lookup_again;
- }
- ASSERT(d_backing_inode(next));
-
- _debug("mkdir -> %pd{ino=%lu}",
- next, d_backing_inode(next)->i_ino);
-
- } else if (!d_can_lookup(next)) {
- pr_err("inode %lu is not a directory\n",
- d_backing_inode(next)->i_ino);
- ret = -ENOBUFS;
- goto error;
- }
-
- } else {
- /* non-index objects start out life as files */
- if (d_is_negative(next)) {
- ret = cachefiles_has_space(cache, 1, 0);
- if (ret < 0)
- goto no_space_error;
-
- path.dentry = dir;
- ret = security_path_mknod(&path, next, S_IFREG, 0);
- if (ret < 0)
- goto create_error;
- ret = vfs_create(&init_user_ns, d_inode(dir), next,
- S_IFREG, true);
- trace_cachefiles_create(object, next, ret);
- if (ret < 0)
- goto create_error;
-
- ASSERT(d_backing_inode(next));
-
- _debug("create -> %pd{ino=%lu}",
- next, d_backing_inode(next)->i_ino);
-
- } else if (!d_can_lookup(next) &&
- !d_is_reg(next)
- ) {
- pr_err("inode %lu is not a file or directory\n",
- d_backing_inode(next)->i_ino);
- ret = -ENOBUFS;
- goto error;
- }
- }
-
- /* process the next component */
- if (key) {
- _debug("advance");
- inode_unlock(d_inode(dir));
- dput(dir);
- dir = next;
- next = NULL;
- goto advance;
- }
-
- /* we've found the object we were looking for */
- object->dentry = next;
-
- /* if we've found that the terminal object exists, then we need to
- * check its attributes and delete it if it's out of date */
- if (!object->new) {
- _debug("validate '%pd'", next);
-
- ret = cachefiles_check_object_xattr(object, auxdata);
- if (ret == -ESTALE) {
- /* delete the object (the deleter drops the directory
- * mutex) */
- object->dentry = NULL;
-
- ret = cachefiles_bury_object(cache, object, dir, next,
- true,
- FSCACHE_OBJECT_IS_STALE);
- dput(next);
- next = NULL;
-
- if (ret < 0)
- goto delete_error;
-
- _debug("redo lookup");
- fscache_object_retrying_stale(&object->fscache);
- goto lookup_again;
- }
- }
-
- /* note that we're now using this object */
- ret = cachefiles_mark_object_active(cache, object);
-
- inode_unlock(d_inode(dir));
- dput(dir);
- dir = NULL;
-
- if (ret == -ETIMEDOUT)
- goto mark_active_timed_out;
-
- _debug("=== OBTAINED_OBJECT ===");
-
- if (object->new) {
- /* attach data to a newly constructed terminal object */
- ret = cachefiles_set_object_xattr(object, auxdata);
- if (ret < 0)
- goto check_error;
- } else {
- /* always update the atime on an object we've just looked up
- * (this is used to keep track of culling, and atimes are only
- * updated by read, write and readdir but not lookup or
- * open) */
- path.dentry = next;
- touch_atime(&path);
- }
-
- /* open a file interface onto a data file */
- if (object->type != FSCACHE_COOKIE_TYPE_INDEX) {
- if (d_is_reg(object->dentry)) {
- const struct address_space_operations *aops;
-
- ret = -EPERM;
- aops = d_backing_inode(object->dentry)->i_mapping->a_ops;
- if (!aops->bmap)
- goto check_error;
- if (object->dentry->d_sb->s_blocksize > PAGE_SIZE)
- goto check_error;
-
- object->backer = object->dentry;
- } else {
- BUG(); // TODO: open file in data-class subdir
- }
- }
-
- object->new = 0;
- fscache_obtained_object(&object->fscache);
-
- _leave(" = 0 [%lu]", d_backing_inode(object->dentry)->i_ino);
- return 0;
-
-no_space_error:
- fscache_object_mark_killed(&object->fscache, FSCACHE_OBJECT_NO_SPACE);
-create_error:
- _debug("create error %d", ret);
- if (ret == -EIO)
- cachefiles_io_error(cache, "Create/mkdir failed");
- goto error;
-
-mark_active_timed_out:
- _debug("mark active timed out");
- goto release_dentry;
-
-check_error:
- _debug("check error %d", ret);
- cachefiles_mark_object_inactive(
- cache, object, d_backing_inode(object->dentry)->i_blocks);
-release_dentry:
- dput(object->dentry);
- object->dentry = NULL;
- goto error_out;
-
-delete_error:
- _debug("delete error %d", ret);
- goto error_out2;
-
-lookup_error:
- _debug("lookup error %ld", PTR_ERR(next));
- ret = PTR_ERR(next);
- if (ret == -EIO)
- cachefiles_io_error(cache, "Lookup failed");
- next = NULL;
-error:
- inode_unlock(d_inode(dir));
- dput(next);
-error_out2:
- dput(dir);
-error_out:
- _leave(" = error %d", -ret);
- return ret;
-}
-
-/*
- * get a subdirectory
- */
-struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
- struct dentry *dir,
- const char *dirname)
-{
- struct dentry *subdir;
- struct path path;
- int ret;
-
- _enter(",,%s", dirname);
-
- /* search the current directory for the element name */
- inode_lock(d_inode(dir));
-
-retry:
- subdir = lookup_one_len(dirname, dir, strlen(dirname));
- if (IS_ERR(subdir)) {
- if (PTR_ERR(subdir) == -ENOMEM)
- goto nomem_d_alloc;
- goto lookup_error;
- }
-
- _debug("subdir -> %pd %s",
- subdir, d_backing_inode(subdir) ? "positive" : "negative");
-
- /* we need to create the subdir if it doesn't exist yet */
- if (d_is_negative(subdir)) {
- ret = cachefiles_has_space(cache, 1, 0);
- if (ret < 0)
- goto mkdir_error;
-
- _debug("attempt mkdir");
-
- path.mnt = cache->mnt;
- path.dentry = dir;
- ret = security_path_mkdir(&path, subdir, 0700);
- if (ret < 0)
- goto mkdir_error;
- ret = vfs_mkdir(&init_user_ns, d_inode(dir), subdir, 0700);
- if (ret < 0)
- goto mkdir_error;
-
- if (unlikely(d_unhashed(subdir))) {
- dput(subdir);
- goto retry;
- }
- ASSERT(d_backing_inode(subdir));
-
- _debug("mkdir -> %pd{ino=%lu}",
- subdir, d_backing_inode(subdir)->i_ino);
- }
-
- inode_unlock(d_inode(dir));
-
- /* we need to make sure the subdir is a directory */
- ASSERT(d_backing_inode(subdir));
-
- if (!d_can_lookup(subdir)) {
- pr_err("%s is not a directory\n", dirname);
- ret = -EIO;
- goto check_error;
- }
-
- ret = -EPERM;
- if (!(d_backing_inode(subdir)->i_opflags & IOP_XATTR) ||
- !d_backing_inode(subdir)->i_op->lookup ||
- !d_backing_inode(subdir)->i_op->mkdir ||
- !d_backing_inode(subdir)->i_op->create ||
- !d_backing_inode(subdir)->i_op->rename ||
- !d_backing_inode(subdir)->i_op->rmdir ||
- !d_backing_inode(subdir)->i_op->unlink)
- goto check_error;
-
- _leave(" = [%lu]", d_backing_inode(subdir)->i_ino);
- return subdir;
-
-check_error:
- dput(subdir);
- _leave(" = %d [check]", ret);
- return ERR_PTR(ret);
-
-mkdir_error:
- inode_unlock(d_inode(dir));
- dput(subdir);
- pr_err("mkdir %s failed with error %d\n", dirname, ret);
- return ERR_PTR(ret);
-
-lookup_error:
- inode_unlock(d_inode(dir));
- ret = PTR_ERR(subdir);
- pr_err("Lookup %s failed with error %d\n", dirname, ret);
- return ERR_PTR(ret);
-
-nomem_d_alloc:
- inode_unlock(d_inode(dir));
- _leave(" = -ENOMEM");
- return ERR_PTR(-ENOMEM);
-}
-
-/*
- * find out if an object is in use or not
- * - if finds object and it's not in use:
- * - returns a pointer to the object and a reference on it
- * - returns with the directory locked
- */
-static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
- struct dentry *dir,
- char *filename)
-{
- struct cachefiles_object *object;
- struct rb_node *_n;
- struct dentry *victim;
- int ret;
-
- //_enter(",%pd/,%s",
- // dir, filename);
-
- /* look up the victim */
- inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
-
- victim = lookup_one_len(filename, dir, strlen(filename));
- if (IS_ERR(victim))
- goto lookup_error;
-
- //_debug("victim -> %pd %s",
- // victim, d_backing_inode(victim) ? "positive" : "negative");
-
- /* if the object is no longer there then we probably retired the object
- * at the netfs's request whilst the cull was in progress
- */
- if (d_is_negative(victim)) {
- inode_unlock(d_inode(dir));
- dput(victim);
- _leave(" = -ENOENT [absent]");
- return ERR_PTR(-ENOENT);
- }
-
- /* check to see if we're using this object */
- read_lock(&cache->active_lock);
-
- _n = cache->active_nodes.rb_node;
-
- while (_n) {
- object = rb_entry(_n, struct cachefiles_object, active_node);
-
- if (object->dentry > victim)
- _n = _n->rb_left;
- else if (object->dentry < victim)
- _n = _n->rb_right;
- else
- goto object_in_use;
- }
-
- read_unlock(&cache->active_lock);
-
- //_leave(" = %pd", victim);
- return victim;
-
-object_in_use:
- read_unlock(&cache->active_lock);
- inode_unlock(d_inode(dir));
- dput(victim);
- //_leave(" = -EBUSY [in use]");
- return ERR_PTR(-EBUSY);
-
-lookup_error:
- inode_unlock(d_inode(dir));
- ret = PTR_ERR(victim);
- if (ret == -ENOENT) {
- /* file or dir now absent - probably retired by netfs */
- _leave(" = -ESTALE [absent]");
- return ERR_PTR(-ESTALE);
- }
-
- if (ret == -EIO) {
- cachefiles_io_error(cache, "Lookup failed");
- } else if (ret != -ENOMEM) {
- pr_err("Internal error: %d\n", ret);
- ret = -EIO;
- }
-
- _leave(" = %d", ret);
- return ERR_PTR(ret);
-}
-
-/*
- * cull an object if it's not in use
- * - called only by cache manager daemon
- */
-int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
- char *filename)
-{
- struct dentry *victim;
- int ret;
-
- _enter(",%pd/,%s", dir, filename);
-
- victim = cachefiles_check_active(cache, dir, filename);
- if (IS_ERR(victim))
- return PTR_ERR(victim);
-
- _debug("victim -> %pd %s",
- victim, d_backing_inode(victim) ? "positive" : "negative");
-
- /* okay... the victim is not being used so we can cull it
- * - start by marking it as stale
- */
- _debug("victim is cullable");
-
- ret = cachefiles_remove_object_xattr(cache, victim);
- if (ret < 0)
- goto error_unlock;
-
- /* actually remove the victim (drops the dir mutex) */
- _debug("bury");
-
- ret = cachefiles_bury_object(cache, NULL, dir, victim, false,
- FSCACHE_OBJECT_WAS_CULLED);
- if (ret < 0)
- goto error;
-
- dput(victim);
- _leave(" = 0");
- return 0;
-
-error_unlock:
- inode_unlock(d_inode(dir));
-error:
- dput(victim);
- if (ret == -ENOENT) {
- /* file or dir now absent - probably retired by netfs */
- _leave(" = -ESTALE [absent]");
- return -ESTALE;
- }
-
- if (ret != -ENOMEM) {
- pr_err("Internal error: %d\n", ret);
- ret = -EIO;
- }
-
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * find out if an object is in use or not
- * - called only by cache manager daemon
- * - returns -EBUSY or 0 to indicate whether an object is in use or not
- */
-int cachefiles_check_in_use(struct cachefiles_cache *cache, struct dentry *dir,
- char *filename)
-{
- struct dentry *victim;
-
- //_enter(",%pd/,%s",
- // dir, filename);
-
- victim = cachefiles_check_active(cache, dir, filename);
- if (IS_ERR(victim))
- return PTR_ERR(victim);
-
- inode_unlock(d_inode(dir));
- dput(victim);
- //_leave(" = 0");
- return 0;
-}
diff --git a/fs/cachefiles/security.c b/fs/cachefiles/security.c
deleted file mode 100644
index aec13fd94692..000000000000
--- a/fs/cachefiles/security.c
+++ /dev/null
@@ -1,112 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* CacheFiles security management
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/fs.h>
-#include <linux/cred.h>
-#include "internal.h"
-
-/*
- * determine the security context within which we access the cache from within
- * the kernel
- */
-int cachefiles_get_security_ID(struct cachefiles_cache *cache)
-{
- struct cred *new;
- int ret;
-
- _enter("{%s}", cache->secctx);
-
- new = prepare_kernel_cred(current);
- if (!new) {
- ret = -ENOMEM;
- goto error;
- }
-
- if (cache->secctx) {
- ret = set_security_override_from_ctx(new, cache->secctx);
- if (ret < 0) {
- put_cred(new);
- pr_err("Security denies permission to nominate security context: error %d\n",
- ret);
- goto error;
- }
- }
-
- cache->cache_cred = new;
- ret = 0;
-error:
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * see if mkdir and create can be performed in the root directory
- */
-static int cachefiles_check_cache_dir(struct cachefiles_cache *cache,
- struct dentry *root)
-{
- int ret;
-
- ret = security_inode_mkdir(d_backing_inode(root), root, 0);
- if (ret < 0) {
- pr_err("Security denies permission to make dirs: error %d",
- ret);
- return ret;
- }
-
- ret = security_inode_create(d_backing_inode(root), root, 0);
- if (ret < 0)
- pr_err("Security denies permission to create files: error %d",
- ret);
-
- return ret;
-}
-
-/*
- * check the security details of the on-disk cache
- * - must be called with security override in force
- * - must return with a security override in force - even in the case of an
- * error
- */
-int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
- struct dentry *root,
- const struct cred **_saved_cred)
-{
- struct cred *new;
- int ret;
-
- _enter("");
-
- /* duplicate the cache creds for COW (the override is currently in
- * force, so we can use prepare_creds() to do this) */
- new = prepare_creds();
- if (!new)
- return -ENOMEM;
-
- cachefiles_end_secure(cache, *_saved_cred);
-
- /* use the cache root dir's security context as the basis with
- * which create files */
- ret = set_create_files_as(new, d_backing_inode(root));
- if (ret < 0) {
- abort_creds(new);
- cachefiles_begin_secure(cache, _saved_cred);
- _leave(" = %d [cfa]", ret);
- return ret;
- }
-
- put_cred(cache->cache_cred);
- cache->cache_cred = new;
-
- cachefiles_begin_secure(cache, _saved_cred);
- ret = cachefiles_check_cache_dir(cache, root);
-
- if (ret == -EOPNOTSUPP)
- ret = 0;
- _leave(" = %d", ret);
- return ret;
-}
diff --git a/fs/cachefiles/xattr.c b/fs/cachefiles/xattr.c
deleted file mode 100644
index 9e82de668595..000000000000
--- a/fs/cachefiles/xattr.c
+++ /dev/null
@@ -1,324 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* CacheFiles extended attribute management
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/fsnotify.h>
-#include <linux/quotaops.h>
-#include <linux/xattr.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-static const char cachefiles_xattr_cache[] =
- XATTR_USER_PREFIX "CacheFiles.cache";
-
-/*
- * check the type label on an object
- * - done using xattrs
- */
-int cachefiles_check_object_type(struct cachefiles_object *object)
-{
- struct dentry *dentry = object->dentry;
- char type[3], xtype[3];
- int ret;
-
- ASSERT(dentry);
- ASSERT(d_backing_inode(dentry));
-
- if (!object->fscache.cookie)
- strcpy(type, "C3");
- else
- snprintf(type, 3, "%02x", object->fscache.cookie->def->type);
-
- _enter("%x{%s}", object->fscache.debug_id, type);
-
- /* attempt to install a type label directly */
- ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache, type,
- 2, XATTR_CREATE);
- if (ret == 0) {
- _debug("SET"); /* we succeeded */
- goto error;
- }
-
- if (ret != -EEXIST) {
- pr_err("Can't set xattr on %pd [%lu] (err %d)\n",
- dentry, d_backing_inode(dentry)->i_ino,
- -ret);
- goto error;
- }
-
- /* read the current type label */
- ret = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache, xtype,
- 3);
- if (ret < 0) {
- if (ret == -ERANGE)
- goto bad_type_length;
-
- pr_err("Can't read xattr on %pd [%lu] (err %d)\n",
- dentry, d_backing_inode(dentry)->i_ino,
- -ret);
- goto error;
- }
-
- /* check the type is what we're expecting */
- if (ret != 2)
- goto bad_type_length;
-
- if (xtype[0] != type[0] || xtype[1] != type[1])
- goto bad_type;
-
- ret = 0;
-
-error:
- _leave(" = %d", ret);
- return ret;
-
-bad_type_length:
- pr_err("Cache object %lu type xattr length incorrect\n",
- d_backing_inode(dentry)->i_ino);
- ret = -EIO;
- goto error;
-
-bad_type:
- xtype[2] = 0;
- pr_err("Cache object %pd [%lu] type %s not %s\n",
- dentry, d_backing_inode(dentry)->i_ino,
- xtype, type);
- ret = -EIO;
- goto error;
-}
-
-/*
- * set the state xattr on a cache file
- */
-int cachefiles_set_object_xattr(struct cachefiles_object *object,
- struct cachefiles_xattr *auxdata)
-{
- struct dentry *dentry = object->dentry;
- int ret;
-
- ASSERT(dentry);
-
- _enter("%p,#%d", object, auxdata->len);
-
- /* attempt to install the cache metadata directly */
- _debug("SET #%u", auxdata->len);
-
- clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
- ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
- &auxdata->type, auxdata->len, XATTR_CREATE);
- if (ret < 0 && ret != -ENOMEM)
- cachefiles_io_error_obj(
- object,
- "Failed to set xattr with error %d", ret);
-
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * update the state xattr on a cache file
- */
-int cachefiles_update_object_xattr(struct cachefiles_object *object,
- struct cachefiles_xattr *auxdata)
-{
- struct dentry *dentry = object->dentry;
- int ret;
-
- if (!dentry)
- return -ESTALE;
-
- _enter("%x,#%d", object->fscache.debug_id, auxdata->len);
-
- /* attempt to install the cache metadata directly */
- _debug("SET #%u", auxdata->len);
-
- clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
- ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
- &auxdata->type, auxdata->len, XATTR_REPLACE);
- if (ret < 0 && ret != -ENOMEM)
- cachefiles_io_error_obj(
- object,
- "Failed to update xattr with error %d", ret);
-
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * check the consistency between the backing cache and the FS-Cache cookie
- */
-int cachefiles_check_auxdata(struct cachefiles_object *object)
-{
- struct cachefiles_xattr *auxbuf;
- enum fscache_checkaux validity;
- struct dentry *dentry = object->dentry;
- ssize_t xlen;
- int ret;
-
- ASSERT(dentry);
- ASSERT(d_backing_inode(dentry));
- ASSERT(object->fscache.cookie->def->check_aux);
-
- auxbuf = kmalloc(sizeof(struct cachefiles_xattr) + 512, GFP_KERNEL);
- if (!auxbuf)
- return -ENOMEM;
-
- xlen = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
- &auxbuf->type, 512 + 1);
- ret = -ESTALE;
- if (xlen < 1 ||
- auxbuf->type != object->fscache.cookie->def->type)
- goto error;
-
- xlen--;
- validity = fscache_check_aux(&object->fscache, &auxbuf->data, xlen,
- i_size_read(d_backing_inode(dentry)));
- if (validity != FSCACHE_CHECKAUX_OKAY)
- goto error;
-
- ret = 0;
-error:
- kfree(auxbuf);
- return ret;
-}
-
-/*
- * check the state xattr on a cache file
- * - return -ESTALE if the object should be deleted
- */
-int cachefiles_check_object_xattr(struct cachefiles_object *object,
- struct cachefiles_xattr *auxdata)
-{
- struct cachefiles_xattr *auxbuf;
- struct dentry *dentry = object->dentry;
- int ret;
-
- _enter("%p,#%d", object, auxdata->len);
-
- ASSERT(dentry);
- ASSERT(d_backing_inode(dentry));
-
- auxbuf = kmalloc(sizeof(struct cachefiles_xattr) + 512, cachefiles_gfp);
- if (!auxbuf) {
- _leave(" = -ENOMEM");
- return -ENOMEM;
- }
-
- /* read the current type label */
- ret = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
- &auxbuf->type, 512 + 1);
- if (ret < 0) {
- if (ret == -ENODATA)
- goto stale; /* no attribute - power went off
- * mid-cull? */
-
- if (ret == -ERANGE)
- goto bad_type_length;
-
- cachefiles_io_error_obj(object,
- "Can't read xattr on %lu (err %d)",
- d_backing_inode(dentry)->i_ino, -ret);
- goto error;
- }
-
- /* check the on-disk object */
- if (ret < 1)
- goto bad_type_length;
-
- if (auxbuf->type != auxdata->type)
- goto stale;
-
- auxbuf->len = ret;
-
- /* consult the netfs */
- if (object->fscache.cookie->def->check_aux) {
- enum fscache_checkaux result;
- unsigned int dlen;
-
- dlen = auxbuf->len - 1;
-
- _debug("checkaux %s #%u",
- object->fscache.cookie->def->name, dlen);
-
- result = fscache_check_aux(&object->fscache,
- &auxbuf->data, dlen,
- i_size_read(d_backing_inode(dentry)));
-
- switch (result) {
- /* entry okay as is */
- case FSCACHE_CHECKAUX_OKAY:
- goto okay;
-
- /* entry requires update */
- case FSCACHE_CHECKAUX_NEEDS_UPDATE:
- break;
-
- /* entry requires deletion */
- case FSCACHE_CHECKAUX_OBSOLETE:
- goto stale;
-
- default:
- BUG();
- }
-
- /* update the current label */
- ret = vfs_setxattr(&init_user_ns, dentry,
- cachefiles_xattr_cache, &auxdata->type,
- auxdata->len, XATTR_REPLACE);
- if (ret < 0) {
- cachefiles_io_error_obj(object,
- "Can't update xattr on %lu"
- " (error %d)",
- d_backing_inode(dentry)->i_ino, -ret);
- goto error;
- }
- }
-
-okay:
- ret = 0;
-
-error:
- kfree(auxbuf);
- _leave(" = %d", ret);
- return ret;
-
-bad_type_length:
- pr_err("Cache object %lu xattr length incorrect\n",
- d_backing_inode(dentry)->i_ino);
- ret = -EIO;
- goto error;
-
-stale:
- ret = -ESTALE;
- goto error;
-}
-
-/*
- * remove the object's xattr to mark it stale
- */
-int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
- struct dentry *dentry)
-{
- int ret;
-
- ret = vfs_removexattr(&init_user_ns, dentry, cachefiles_xattr_cache);
- if (ret < 0) {
- if (ret == -ENOENT || ret == -ENODATA)
- ret = 0;
- else if (ret != -ENOMEM)
- cachefiles_io_error(cache,
- "Can't remove xattr from %lu"
- " (error %d)",
- d_backing_inode(dentry)->i_ino, -ret);
- }
-
- _leave(" = %d", ret);
- return ret;
-}
diff --git a/fs/cachefiles_old/Kconfig b/fs/cachefiles_old/Kconfig
new file mode 100644
index 000000000000..7f3e1881fb21
--- /dev/null
+++ b/fs/cachefiles_old/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config CACHEFILES
+ tristate "Filesystem caching on files"
+ depends on FSCACHE_OLD && BLOCK
+ help
+ This permits use of a mounted filesystem as a cache for other
+ filesystems - primarily networking filesystems - thus allowing fast
+ local disk to enhance the speed of slower devices.
+
+ See Documentation/filesystems/caching/cachefiles.rst for more
+ information.
+
+config CACHEFILES_DEBUG
+ bool "Debug CacheFiles"
+ depends on CACHEFILES
+ help
+ This permits debugging to be dynamically enabled in the filesystem
+ caching on files module. If this is set, the debugging output may be
+ enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
+ by including a debugging specifier in /etc/cachefilesd.conf.
diff --git a/fs/cachefiles_old/Makefile b/fs/cachefiles_old/Makefile
new file mode 100644
index 000000000000..714e84b3ca24
--- /dev/null
+++ b/fs/cachefiles_old/Makefile
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for caching in a mounted filesystem
+#
+
+cachefiles-y := \
+ bind.o \
+ daemon.o \
+ interface.o \
+ io.o \
+ key.o \
+ main.o \
+ namei.o \
+ security.o \
+ xattr.o
+
+obj-$(CONFIG_CACHEFILES) := cachefiles.o
diff --git a/fs/cachefiles_old/bind.c b/fs/cachefiles_old/bind.c
new file mode 100644
index 000000000000..d463d89f5db8
--- /dev/null
+++ b/fs/cachefiles_old/bind.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Bind and unbind a cache from the filesystem backing it
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/ctype.h>
+#include <linux/xattr.h>
+#include "internal.h"
+
+static int cachefiles_daemon_add_cache(struct cachefiles_cache *caches);
+
+/*
+ * bind a directory as a cache
+ */
+int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
+{
+ _enter("{%u,%u,%u,%u,%u,%u},%s",
+ cache->frun_percent,
+ cache->fcull_percent,
+ cache->fstop_percent,
+ cache->brun_percent,
+ cache->bcull_percent,
+ cache->bstop_percent,
+ args);
+
+ /* start by checking things over */
+ ASSERT(cache->fstop_percent >= 0 &&
+ cache->fstop_percent < cache->fcull_percent &&
+ cache->fcull_percent < cache->frun_percent &&
+ cache->frun_percent < 100);
+
+ ASSERT(cache->bstop_percent >= 0 &&
+ cache->bstop_percent < cache->bcull_percent &&
+ cache->bcull_percent < cache->brun_percent &&
+ cache->brun_percent < 100);
+
+ if (*args) {
+ pr_err("'bind' command doesn't take an argument\n");
+ return -EINVAL;
+ }
+
+ if (!cache->rootdirname) {
+ pr_err("No cache directory specified\n");
+ return -EINVAL;
+ }
+
+ /* don't permit already bound caches to be re-bound */
+ if (test_bit(CACHEFILES_READY, &cache->flags)) {
+ pr_err("Cache already bound\n");
+ return -EBUSY;
+ }
+
+ /* make sure we have copies of the tag and dirname strings */
+ if (!cache->tag) {
+ /* the tag string is released by the fops->release()
+ * function, so we don't release it on error here */
+ cache->tag = kstrdup("CacheFiles", GFP_KERNEL);
+ if (!cache->tag)
+ return -ENOMEM;
+ }
+
+ /* add the cache */
+ return cachefiles_daemon_add_cache(cache);
+}
+
+/*
+ * add a cache
+ */
+static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
+{
+ struct cachefiles_object *fsdef;
+ struct path path;
+ struct kstatfs stats;
+ struct dentry *graveyard, *cachedir, *root;
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter("");
+
+ /* we want to work under the module's security ID */
+ ret = cachefiles_get_security_ID(cache);
+ if (ret < 0)
+ return ret;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+
+ /* allocate the root index object */
+ ret = -ENOMEM;
+
+ fsdef = kmem_cache_alloc(cachefiles_object_jar, GFP_KERNEL);
+ if (!fsdef)
+ goto error_root_object;
+
+ ASSERTCMP(fsdef->backer, ==, NULL);
+
+ atomic_set(&fsdef->usage, 1);
+ fsdef->type = FSCACHE_COOKIE_TYPE_INDEX;
+
+ /* look up the directory at the root of the cache */
+ ret = kern_path(cache->rootdirname, LOOKUP_DIRECTORY, &path);
+ if (ret < 0)
+ goto error_open_root;
+
+ cache->mnt = path.mnt;
+ root = path.dentry;
+
+ ret = -EINVAL;
+ if (mnt_user_ns(path.mnt) != &init_user_ns) {
+ pr_warn("File cache on idmapped mounts not supported");
+ goto error_unsupported;
+ }
+
+ /* check parameters */
+ ret = -EOPNOTSUPP;
+ if (d_is_negative(root) ||
+ !d_backing_inode(root)->i_op->lookup ||
+ !d_backing_inode(root)->i_op->mkdir ||
+ !(d_backing_inode(root)->i_opflags & IOP_XATTR) ||
+ !root->d_sb->s_op->statfs ||
+ !root->d_sb->s_op->sync_fs)
+ goto error_unsupported;
+
+ ret = -EROFS;
+ if (sb_rdonly(root->d_sb))
+ goto error_unsupported;
+
+ /* determine the security of the on-disk cache as this governs
+ * security ID of files we create */
+ ret = cachefiles_determine_cache_security(cache, root, &saved_cred);
+ if (ret < 0)
+ goto error_unsupported;
+
+ /* get the cache size and blocksize */
+ ret = vfs_statfs(&path, &stats);
+ if (ret < 0)
+ goto error_unsupported;
+
+ ret = -ERANGE;
+ if (stats.f_bsize <= 0)
+ goto error_unsupported;
+
+ ret = -EOPNOTSUPP;
+ if (stats.f_bsize > PAGE_SIZE)
+ goto error_unsupported;
+
+ cache->bsize = stats.f_bsize;
+ cache->bshift = 0;
+ if (stats.f_bsize < PAGE_SIZE)
+ cache->bshift = PAGE_SHIFT - ilog2(stats.f_bsize);
+
+ _debug("blksize %u (shift %u)",
+ cache->bsize, cache->bshift);
+
+ _debug("size %llu, avail %llu",
+ (unsigned long long) stats.f_blocks,
+ (unsigned long long) stats.f_bavail);
+
+ /* set up caching limits */
+ do_div(stats.f_files, 100);
+ cache->fstop = stats.f_files * cache->fstop_percent;
+ cache->fcull = stats.f_files * cache->fcull_percent;
+ cache->frun = stats.f_files * cache->frun_percent;
+
+ _debug("limits {%llu,%llu,%llu} files",
+ (unsigned long long) cache->frun,
+ (unsigned long long) cache->fcull,
+ (unsigned long long) cache->fstop);
+
+ stats.f_blocks >>= cache->bshift;
+ do_div(stats.f_blocks, 100);
+ cache->bstop = stats.f_blocks * cache->bstop_percent;
+ cache->bcull = stats.f_blocks * cache->bcull_percent;
+ cache->brun = stats.f_blocks * cache->brun_percent;
+
+ _debug("limits {%llu,%llu,%llu} blocks",
+ (unsigned long long) cache->brun,
+ (unsigned long long) cache->bcull,
+ (unsigned long long) cache->bstop);
+
+ /* get the cache directory and check its type */
+ cachedir = cachefiles_get_directory(cache, root, "cache");
+ if (IS_ERR(cachedir)) {
+ ret = PTR_ERR(cachedir);
+ goto error_unsupported;
+ }
+
+ fsdef->dentry = cachedir;
+ fsdef->fscache.cookie = NULL;
+
+ ret = cachefiles_check_object_type(fsdef);
+ if (ret < 0)
+ goto error_unsupported;
+
+ /* get the graveyard directory */
+ graveyard = cachefiles_get_directory(cache, root, "graveyard");
+ if (IS_ERR(graveyard)) {
+ ret = PTR_ERR(graveyard);
+ goto error_unsupported;
+ }
+
+ cache->graveyard = graveyard;
+
+ /* publish the cache */
+ fscache_init_cache(&cache->cache,
+ &cachefiles_cache_ops,
+ "%s",
+ fsdef->dentry->d_sb->s_id);
+
+ fscache_object_init(&fsdef->fscache, &fscache_fsdef_index,
+ &cache->cache);
+
+ ret = fscache_add_cache(&cache->cache, &fsdef->fscache, cache->tag);
+ if (ret < 0)
+ goto error_add_cache;
+
+ /* done */
+ set_bit(CACHEFILES_READY, &cache->flags);
+ dput(root);
+
+ pr_info("File cache on %s registered\n", cache->cache.identifier);
+
+ /* check how much space the cache has */
+ cachefiles_has_space(cache, 0, 0);
+ cachefiles_end_secure(cache, saved_cred);
+ return 0;
+
+error_add_cache:
+ dput(cache->graveyard);
+ cache->graveyard = NULL;
+error_unsupported:
+ mntput(cache->mnt);
+ cache->mnt = NULL;
+ dput(fsdef->dentry);
+ fsdef->dentry = NULL;
+ dput(root);
+error_open_root:
+ kmem_cache_free(cachefiles_object_jar, fsdef);
+error_root_object:
+ cachefiles_end_secure(cache, saved_cred);
+ pr_err("Failed to register: %d\n", ret);
+ return ret;
+}
+
+/*
+ * unbind a cache on fd release
+ */
+void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
+{
+ _enter("");
+
+ if (test_bit(CACHEFILES_READY, &cache->flags)) {
+ pr_info("File cache on %s unregistering\n",
+ cache->cache.identifier);
+
+ fscache_withdraw_cache(&cache->cache);
+ }
+
+ dput(cache->graveyard);
+ mntput(cache->mnt);
+
+ kfree(cache->rootdirname);
+ kfree(cache->secctx);
+ kfree(cache->tag);
+
+ _leave("");
+}
diff --git a/fs/cachefiles_old/daemon.c b/fs/cachefiles_old/daemon.c
new file mode 100644
index 000000000000..752c1e43416f
--- /dev/null
+++ b/fs/cachefiles_old/daemon.c
@@ -0,0 +1,748 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Daemon interface
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/namei.h>
+#include <linux/poll.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/fs_struct.h>
+#include "internal.h"
+
+static int cachefiles_daemon_open(struct inode *, struct file *);
+static int cachefiles_daemon_release(struct inode *, struct file *);
+static ssize_t cachefiles_daemon_read(struct file *, char __user *, size_t,
+ loff_t *);
+static ssize_t cachefiles_daemon_write(struct file *, const char __user *,
+ size_t, loff_t *);
+static __poll_t cachefiles_daemon_poll(struct file *,
+ struct poll_table_struct *);
+static int cachefiles_daemon_frun(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_fcull(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_fstop(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_brun(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_bcull(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_bstop(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_cull(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_debug(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_dir(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_inuse(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_secctx(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_tag(struct cachefiles_cache *, char *);
+
+static unsigned long cachefiles_open;
+
+const struct file_operations cachefiles_daemon_fops = {
+ .owner = THIS_MODULE,
+ .open = cachefiles_daemon_open,
+ .release = cachefiles_daemon_release,
+ .read = cachefiles_daemon_read,
+ .write = cachefiles_daemon_write,
+ .poll = cachefiles_daemon_poll,
+ .llseek = noop_llseek,
+};
+
+struct cachefiles_daemon_cmd {
+ char name[8];
+ int (*handler)(struct cachefiles_cache *cache, char *args);
+};
+
+static const struct cachefiles_daemon_cmd cachefiles_daemon_cmds[] = {
+ { "bind", cachefiles_daemon_bind },
+ { "brun", cachefiles_daemon_brun },
+ { "bcull", cachefiles_daemon_bcull },
+ { "bstop", cachefiles_daemon_bstop },
+ { "cull", cachefiles_daemon_cull },
+ { "debug", cachefiles_daemon_debug },
+ { "dir", cachefiles_daemon_dir },
+ { "frun", cachefiles_daemon_frun },
+ { "fcull", cachefiles_daemon_fcull },
+ { "fstop", cachefiles_daemon_fstop },
+ { "inuse", cachefiles_daemon_inuse },
+ { "secctx", cachefiles_daemon_secctx },
+ { "tag", cachefiles_daemon_tag },
+ { "", NULL }
+};
+
+
+/*
+ * do various checks
+ */
+static int cachefiles_daemon_open(struct inode *inode, struct file *file)
+{
+ struct cachefiles_cache *cache;
+
+ _enter("");
+
+ /* only the superuser may do this */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ /* the cachefiles device may only be open once at a time */
+ if (xchg(&cachefiles_open, 1) == 1)
+ return -EBUSY;
+
+ /* allocate a cache record */
+ cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL);
+ if (!cache) {
+ cachefiles_open = 0;
+ return -ENOMEM;
+ }
+
+ mutex_init(&cache->daemon_mutex);
+ cache->active_nodes = RB_ROOT;
+ rwlock_init(&cache->active_lock);
+ init_waitqueue_head(&cache->daemon_pollwq);
+
+ /* set default caching limits
+ * - limit at 1% free space and/or free files
+ * - cull below 5% free space and/or free files
+ * - cease culling above 7% free space and/or free files
+ */
+ cache->frun_percent = 7;
+ cache->fcull_percent = 5;
+ cache->fstop_percent = 1;
+ cache->brun_percent = 7;
+ cache->bcull_percent = 5;
+ cache->bstop_percent = 1;
+
+ file->private_data = cache;
+ cache->cachefilesd = file;
+ return 0;
+}
+
+/*
+ * release a cache
+ */
+static int cachefiles_daemon_release(struct inode *inode, struct file *file)
+{
+ struct cachefiles_cache *cache = file->private_data;
+
+ _enter("");
+
+ ASSERT(cache);
+
+ set_bit(CACHEFILES_DEAD, &cache->flags);
+
+ cachefiles_daemon_unbind(cache);
+
+ ASSERT(!cache->active_nodes.rb_node);
+
+ /* clean up the control file interface */
+ cache->cachefilesd = NULL;
+ file->private_data = NULL;
+ cachefiles_open = 0;
+
+ kfree(cache);
+
+ _leave("");
+ return 0;
+}
+
+/*
+ * read the cache state
+ */
+static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer,
+ size_t buflen, loff_t *pos)
+{
+ struct cachefiles_cache *cache = file->private_data;
+ unsigned long long b_released;
+ unsigned f_released;
+ char buffer[256];
+ int n;
+
+ //_enter(",,%zu,", buflen);
+
+ if (!test_bit(CACHEFILES_READY, &cache->flags))
+ return 0;
+
+ /* check how much space the cache has */
+ cachefiles_has_space(cache, 0, 0);
+
+ /* summarise */
+ f_released = atomic_xchg(&cache->f_released, 0);
+ b_released = atomic_long_xchg(&cache->b_released, 0);
+ clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
+
+ n = snprintf(buffer, sizeof(buffer),
+ "cull=%c"
+ " frun=%llx"
+ " fcull=%llx"
+ " fstop=%llx"
+ " brun=%llx"
+ " bcull=%llx"
+ " bstop=%llx"
+ " freleased=%x"
+ " breleased=%llx",
+ test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0',
+ (unsigned long long) cache->frun,
+ (unsigned long long) cache->fcull,
+ (unsigned long long) cache->fstop,
+ (unsigned long long) cache->brun,
+ (unsigned long long) cache->bcull,
+ (unsigned long long) cache->bstop,
+ f_released,
+ b_released);
+
+ if (n > buflen)
+ return -EMSGSIZE;
+
+ if (copy_to_user(_buffer, buffer, n) != 0)
+ return -EFAULT;
+
+ return n;
+}
+
+/*
+ * command the cache
+ */
+static ssize_t cachefiles_daemon_write(struct file *file,
+ const char __user *_data,
+ size_t datalen,
+ loff_t *pos)
+{
+ const struct cachefiles_daemon_cmd *cmd;
+ struct cachefiles_cache *cache = file->private_data;
+ ssize_t ret;
+ char *data, *args, *cp;
+
+ //_enter(",,%zu,", datalen);
+
+ ASSERT(cache);
+
+ if (test_bit(CACHEFILES_DEAD, &cache->flags))
+ return -EIO;
+
+ if (datalen < 0 || datalen > PAGE_SIZE - 1)
+ return -EOPNOTSUPP;
+
+ /* drag the command string into the kernel so we can parse it */
+ data = memdup_user_nul(_data, datalen);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ ret = -EINVAL;
+ if (memchr(data, '\0', datalen))
+ goto error;
+
+ /* strip any newline */
+ cp = memchr(data, '\n', datalen);
+ if (cp) {
+ if (cp == data)
+ goto error;
+
+ *cp = '\0';
+ }
+
+ /* parse the command */
+ ret = -EOPNOTSUPP;
+
+ for (args = data; *args; args++)
+ if (isspace(*args))
+ break;
+ if (*args) {
+ if (args == data)
+ goto error;
+ *args = '\0';
+ args = skip_spaces(++args);
+ }
+
+ /* run the appropriate command handler */
+ for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++)
+ if (strcmp(cmd->name, data) == 0)
+ goto found_command;
+
+error:
+ kfree(data);
+ //_leave(" = %zd", ret);
+ return ret;
+
+found_command:
+ mutex_lock(&cache->daemon_mutex);
+
+ ret = -EIO;
+ if (!test_bit(CACHEFILES_DEAD, &cache->flags))
+ ret = cmd->handler(cache, args);
+
+ mutex_unlock(&cache->daemon_mutex);
+
+ if (ret == 0)
+ ret = datalen;
+ goto error;
+}
+
+/*
+ * poll for culling state
+ * - use EPOLLOUT to indicate culling state
+ */
+static __poll_t cachefiles_daemon_poll(struct file *file,
+ struct poll_table_struct *poll)
+{
+ struct cachefiles_cache *cache = file->private_data;
+ __poll_t mask;
+
+ poll_wait(file, &cache->daemon_pollwq, poll);
+ mask = 0;
+
+ if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags))
+ mask |= EPOLLIN;
+
+ if (test_bit(CACHEFILES_CULLING, &cache->flags))
+ mask |= EPOLLOUT;
+
+ return mask;
+}
+
+/*
+ * give a range error for cache space constraints
+ * - can be tail-called
+ */
+static int cachefiles_daemon_range_error(struct cachefiles_cache *cache,
+ char *args)
+{
+ pr_err("Free space limits must be in range 0%%<=stop<cull<run<100%%\n");
+
+ return -EINVAL;
+}
+
+/*
+ * set the percentage of files at which to stop culling
+ * - command: "frun <N>%"
+ */
+static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long frun;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ frun = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (frun <= cache->fcull_percent || frun >= 100)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->frun_percent = frun;
+ return 0;
+}
+
+/*
+ * set the percentage of files at which to start culling
+ * - command: "fcull <N>%"
+ */
+static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long fcull;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ fcull = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->fcull_percent = fcull;
+ return 0;
+}
+
+/*
+ * set the percentage of files at which to stop allocating
+ * - command: "fstop <N>%"
+ */
+static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long fstop;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ fstop = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (fstop < 0 || fstop >= cache->fcull_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->fstop_percent = fstop;
+ return 0;
+}
+
+/*
+ * set the percentage of blocks at which to stop culling
+ * - command: "brun <N>%"
+ */
+static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long brun;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ brun = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (brun <= cache->bcull_percent || brun >= 100)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->brun_percent = brun;
+ return 0;
+}
+
+/*
+ * set the percentage of blocks at which to start culling
+ * - command: "bcull <N>%"
+ */
+static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long bcull;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ bcull = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->bcull_percent = bcull;
+ return 0;
+}
+
+/*
+ * set the percentage of blocks at which to stop allocating
+ * - command: "bstop <N>%"
+ */
+static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long bstop;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ bstop = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (bstop < 0 || bstop >= cache->bcull_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->bstop_percent = bstop;
+ return 0;
+}
+
+/*
+ * set the cache directory
+ * - command: "dir <name>"
+ */
+static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)
+{
+ char *dir;
+
+ _enter(",%s", args);
+
+ if (!*args) {
+ pr_err("Empty directory specified\n");
+ return -EINVAL;
+ }
+
+ if (cache->rootdirname) {
+ pr_err("Second cache directory specified\n");
+ return -EEXIST;
+ }
+
+ dir = kstrdup(args, GFP_KERNEL);
+ if (!dir)
+ return -ENOMEM;
+
+ cache->rootdirname = dir;
+ return 0;
+}
+
+/*
+ * set the cache security context
+ * - command: "secctx <ctx>"
+ */
+static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)
+{
+ char *secctx;
+
+ _enter(",%s", args);
+
+ if (!*args) {
+ pr_err("Empty security context specified\n");
+ return -EINVAL;
+ }
+
+ if (cache->secctx) {
+ pr_err("Second security context specified\n");
+ return -EINVAL;
+ }
+
+ secctx = kstrdup(args, GFP_KERNEL);
+ if (!secctx)
+ return -ENOMEM;
+
+ cache->secctx = secctx;
+ return 0;
+}
+
+/*
+ * set the cache tag
+ * - command: "tag <name>"
+ */
+static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)
+{
+ char *tag;
+
+ _enter(",%s", args);
+
+ if (!*args) {
+ pr_err("Empty tag specified\n");
+ return -EINVAL;
+ }
+
+ if (cache->tag)
+ return -EEXIST;
+
+ tag = kstrdup(args, GFP_KERNEL);
+ if (!tag)
+ return -ENOMEM;
+
+ cache->tag = tag;
+ return 0;
+}
+
+/*
+ * request a node in the cache be culled from the current working directory
+ * - command: "cull <name>"
+ */
+static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
+{
+ struct path path;
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter(",%s", args);
+
+ if (strchr(args, '/'))
+ goto inval;
+
+ if (!test_bit(CACHEFILES_READY, &cache->flags)) {
+ pr_err("cull applied to unready cache\n");
+ return -EIO;
+ }
+
+ if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
+ pr_err("cull applied to dead cache\n");
+ return -EIO;
+ }
+
+ /* extract the directory dentry from the cwd */
+ get_fs_pwd(current->fs, &path);
+
+ if (!d_can_lookup(path.dentry))
+ goto notdir;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = cachefiles_cull(cache, path.dentry, args);
+ cachefiles_end_secure(cache, saved_cred);
+
+ path_put(&path);
+ _leave(" = %d", ret);
+ return ret;
+
+notdir:
+ path_put(&path);
+ pr_err("cull command requires dirfd to be a directory\n");
+ return -ENOTDIR;
+
+inval:
+ pr_err("cull command requires dirfd and filename\n");
+ return -EINVAL;
+}
+
+/*
+ * set debugging mode
+ * - command: "debug <mask>"
+ */
+static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long mask;
+
+ _enter(",%s", args);
+
+ mask = simple_strtoul(args, &args, 0);
+ if (args[0] != '\0')
+ goto inval;
+
+ cachefiles_debug = mask;
+ _leave(" = 0");
+ return 0;
+
+inval:
+ pr_err("debug command requires mask\n");
+ return -EINVAL;
+}
+
+/*
+ * find out whether an object in the current working directory is in use or not
+ * - command: "inuse <name>"
+ */
+static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
+{
+ struct path path;
+ const struct cred *saved_cred;
+ int ret;
+
+ //_enter(",%s", args);
+
+ if (strchr(args, '/'))
+ goto inval;
+
+ if (!test_bit(CACHEFILES_READY, &cache->flags)) {
+ pr_err("inuse applied to unready cache\n");
+ return -EIO;
+ }
+
+ if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
+ pr_err("inuse applied to dead cache\n");
+ return -EIO;
+ }
+
+ /* extract the directory dentry from the cwd */
+ get_fs_pwd(current->fs, &path);
+
+ if (!d_can_lookup(path.dentry))
+ goto notdir;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = cachefiles_check_in_use(cache, path.dentry, args);
+ cachefiles_end_secure(cache, saved_cred);
+
+ path_put(&path);
+ //_leave(" = %d", ret);
+ return ret;
+
+notdir:
+ path_put(&path);
+ pr_err("inuse command requires dirfd to be a directory\n");
+ return -ENOTDIR;
+
+inval:
+ pr_err("inuse command requires dirfd and filename\n");
+ return -EINVAL;
+}
+
+/*
+ * see if we have space for a number of pages and/or a number of files in the
+ * cache
+ */
+int cachefiles_has_space(struct cachefiles_cache *cache,
+ unsigned fnr, unsigned bnr)
+{
+ struct kstatfs stats;
+ struct path path = {
+ .mnt = cache->mnt,
+ .dentry = cache->mnt->mnt_root,
+ };
+ int ret;
+
+ //_enter("{%llu,%llu,%llu,%llu,%llu,%llu},%u,%u",
+ // (unsigned long long) cache->frun,
+ // (unsigned long long) cache->fcull,
+ // (unsigned long long) cache->fstop,
+ // (unsigned long long) cache->brun,
+ // (unsigned long long) cache->bcull,
+ // (unsigned long long) cache->bstop,
+ // fnr, bnr);
+
+ /* find out how many pages of blockdev are available */
+ memset(&stats, 0, sizeof(stats));
+
+ ret = vfs_statfs(&path, &stats);
+ if (ret < 0) {
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "statfs failed");
+ _leave(" = %d", ret);
+ return ret;
+ }
+
+ stats.f_bavail >>= cache->bshift;
+
+ //_debug("avail %llu,%llu",
+ // (unsigned long long) stats.f_ffree,
+ // (unsigned long long) stats.f_bavail);
+
+ /* see if there is sufficient space */
+ if (stats.f_ffree > fnr)
+ stats.f_ffree -= fnr;
+ else
+ stats.f_ffree = 0;
+
+ if (stats.f_bavail > bnr)
+ stats.f_bavail -= bnr;
+ else
+ stats.f_bavail = 0;
+
+ ret = -ENOBUFS;
+ if (stats.f_ffree < cache->fstop ||
+ stats.f_bavail < cache->bstop)
+ goto begin_cull;
+
+ ret = 0;
+ if (stats.f_ffree < cache->fcull ||
+ stats.f_bavail < cache->bcull)
+ goto begin_cull;
+
+ if (test_bit(CACHEFILES_CULLING, &cache->flags) &&
+ stats.f_ffree >= cache->frun &&
+ stats.f_bavail >= cache->brun &&
+ test_and_clear_bit(CACHEFILES_CULLING, &cache->flags)
+ ) {
+ _debug("cease culling");
+ cachefiles_state_changed(cache);
+ }
+
+ //_leave(" = 0");
+ return 0;
+
+begin_cull:
+ if (!test_and_set_bit(CACHEFILES_CULLING, &cache->flags)) {
+ _debug("### CULL CACHE ###");
+ cachefiles_state_changed(cache);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
diff --git a/fs/cachefiles_old/interface.c b/fs/cachefiles_old/interface.c
new file mode 100644
index 000000000000..83671488a323
--- /dev/null
+++ b/fs/cachefiles_old/interface.c
@@ -0,0 +1,557 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache interface to CacheFiles
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/slab.h>
+#include <linux/mount.h>
+#include "internal.h"
+
+struct cachefiles_lookup_data {
+ struct cachefiles_xattr *auxdata; /* auxiliary data */
+ char *key; /* key path */
+};
+
+static int cachefiles_attr_changed(struct fscache_object *_object);
+
+/*
+ * allocate an object record for a cookie lookup and prepare the lookup data
+ */
+static struct fscache_object *cachefiles_alloc_object(
+ struct fscache_cache *_cache,
+ struct fscache_cookie *cookie)
+{
+ struct cachefiles_lookup_data *lookup_data;
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ struct cachefiles_xattr *auxdata;
+ unsigned keylen, auxlen;
+ void *buffer, *p;
+ char *key;
+
+ cache = container_of(_cache, struct cachefiles_cache, cache);
+
+ _enter("{%s},%x,", cache->cache.identifier, cookie->debug_id);
+
+ lookup_data = kmalloc(sizeof(*lookup_data), cachefiles_gfp);
+ if (!lookup_data)
+ goto nomem_lookup_data;
+
+ /* create a new object record and a temporary leaf image */
+ object = kmem_cache_alloc(cachefiles_object_jar, cachefiles_gfp);
+ if (!object)
+ goto nomem_object;
+
+ ASSERTCMP(object->backer, ==, NULL);
+
+ BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
+ atomic_set(&object->usage, 1);
+
+ fscache_object_init(&object->fscache, cookie, &cache->cache);
+
+ object->type = cookie->def->type;
+
+ /* get hold of the raw key
+ * - stick the length on the front and leave space on the back for the
+ * encoder
+ */
+ buffer = kmalloc((2 + 512) + 3, cachefiles_gfp);
+ if (!buffer)
+ goto nomem_buffer;
+
+ keylen = cookie->key_len;
+ if (keylen <= sizeof(cookie->inline_key))
+ p = cookie->inline_key;
+ else
+ p = cookie->key;
+ memcpy(buffer + 2, p, keylen);
+
+ *(uint16_t *)buffer = keylen;
+ ((char *)buffer)[keylen + 2] = 0;
+ ((char *)buffer)[keylen + 3] = 0;
+ ((char *)buffer)[keylen + 4] = 0;
+
+ /* turn the raw key into something that can work with as a filename */
+ key = cachefiles_cook_key(buffer, keylen + 2, object->type);
+ if (!key)
+ goto nomem_key;
+
+ /* get hold of the auxiliary data and prepend the object type */
+ auxdata = buffer;
+ auxlen = cookie->aux_len;
+ if (auxlen) {
+ if (auxlen <= sizeof(cookie->inline_aux))
+ p = cookie->inline_aux;
+ else
+ p = cookie->aux;
+ memcpy(auxdata->data, p, auxlen);
+ }
+
+ auxdata->len = auxlen + 1;
+ auxdata->type = cookie->type;
+
+ lookup_data->auxdata = auxdata;
+ lookup_data->key = key;
+ object->lookup_data = lookup_data;
+
+ _leave(" = %x [%p]", object->fscache.debug_id, lookup_data);
+ return &object->fscache;
+
+nomem_key:
+ kfree(buffer);
+nomem_buffer:
+ BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
+ kmem_cache_free(cachefiles_object_jar, object);
+ fscache_object_destroyed(&cache->cache);
+nomem_object:
+ kfree(lookup_data);
+nomem_lookup_data:
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * attempt to look up the nominated node in this cache
+ * - return -ETIMEDOUT to be scheduled again
+ */
+static int cachefiles_lookup_object(struct fscache_object *_object)
+{
+ struct cachefiles_lookup_data *lookup_data;
+ struct cachefiles_object *parent, *object;
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter("{OBJ%x}", _object->debug_id);
+
+ cache = container_of(_object->cache, struct cachefiles_cache, cache);
+ parent = container_of(_object->parent,
+ struct cachefiles_object, fscache);
+ object = container_of(_object, struct cachefiles_object, fscache);
+ lookup_data = object->lookup_data;
+
+ ASSERTCMP(lookup_data, !=, NULL);
+
+ /* look up the key, creating any missing bits */
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = cachefiles_walk_to_object(parent, object,
+ lookup_data->key,
+ lookup_data->auxdata);
+ cachefiles_end_secure(cache, saved_cred);
+
+ /* polish off by setting the attributes of non-index files */
+ if (ret == 0 &&
+ object->fscache.cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX)
+ cachefiles_attr_changed(&object->fscache);
+
+ if (ret < 0 && ret != -ETIMEDOUT) {
+ if (ret != -ENOBUFS)
+ pr_warn("Lookup failed error %d\n", ret);
+ fscache_object_lookup_error(&object->fscache);
+ }
+
+ _leave(" [%d]", ret);
+ return ret;
+}
+
+/*
+ * indication of lookup completion
+ */
+static void cachefiles_lookup_complete(struct fscache_object *_object)
+{
+ struct cachefiles_object *object;
+
+ object = container_of(_object, struct cachefiles_object, fscache);
+
+ _enter("{OBJ%x,%p}", object->fscache.debug_id, object->lookup_data);
+
+ if (object->lookup_data) {
+ kfree(object->lookup_data->key);
+ kfree(object->lookup_data->auxdata);
+ kfree(object->lookup_data);
+ object->lookup_data = NULL;
+ }
+}
+
+/*
+ * increment the usage count on an inode object (may fail if unmounting)
+ */
+static
+struct fscache_object *cachefiles_grab_object(struct fscache_object *_object,
+ enum fscache_obj_ref_trace why)
+{
+ struct cachefiles_object *object =
+ container_of(_object, struct cachefiles_object, fscache);
+ int u;
+
+ _enter("{OBJ%x,%d}", _object->debug_id, atomic_read(&object->usage));
+
+#ifdef CACHEFILES_DEBUG_SLAB
+ ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
+#endif
+
+ u = atomic_inc_return(&object->usage);
+ trace_cachefiles_ref(object, _object->cookie,
+ (enum cachefiles_obj_ref_trace)why, u);
+ return &object->fscache;
+}
+
+/*
+ * update the auxiliary data for an object object on disk
+ */
+static void cachefiles_update_object(struct fscache_object *_object)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_xattr *auxdata;
+ struct cachefiles_cache *cache;
+ struct fscache_cookie *cookie;
+ const struct cred *saved_cred;
+ const void *aux;
+ unsigned auxlen;
+
+ _enter("{OBJ%x}", _object->debug_id);
+
+ object = container_of(_object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache, struct cachefiles_cache,
+ cache);
+
+ if (!fscache_use_cookie(_object)) {
+ _leave(" [relinq]");
+ return;
+ }
+
+ cookie = object->fscache.cookie;
+ auxlen = cookie->aux_len;
+
+ if (!auxlen) {
+ fscache_unuse_cookie(_object);
+ _leave(" [no aux]");
+ return;
+ }
+
+ auxdata = kmalloc(2 + auxlen + 3, cachefiles_gfp);
+ if (!auxdata) {
+ fscache_unuse_cookie(_object);
+ _leave(" [nomem]");
+ return;
+ }
+
+ aux = (auxlen <= sizeof(cookie->inline_aux)) ?
+ cookie->inline_aux : cookie->aux;
+
+ memcpy(auxdata->data, aux, auxlen);
+ fscache_unuse_cookie(_object);
+
+ auxdata->len = auxlen + 1;
+ auxdata->type = cookie->type;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ cachefiles_update_object_xattr(object, auxdata);
+ cachefiles_end_secure(cache, saved_cred);
+ kfree(auxdata);
+ _leave("");
+}
+
+/*
+ * discard the resources pinned by an object and effect retirement if
+ * requested
+ */
+static void cachefiles_drop_object(struct fscache_object *_object)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ struct inode *inode;
+ blkcnt_t i_blocks = 0;
+
+ ASSERT(_object);
+
+ object = container_of(_object, struct cachefiles_object, fscache);
+
+ _enter("{OBJ%x,%d}",
+ object->fscache.debug_id, atomic_read(&object->usage));
+
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+
+#ifdef CACHEFILES_DEBUG_SLAB
+ ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
+#endif
+
+ /* We need to tidy the object up if we did in fact manage to open it.
+ * It's possible for us to get here before the object is fully
+ * initialised if the parent goes away or the object gets retired
+ * before we set it up.
+ */
+ if (object->dentry) {
+ /* delete retired objects */
+ if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
+ _object != cache->cache.fsdef
+ ) {
+ _debug("- retire object OBJ%x", object->fscache.debug_id);
+ inode = d_backing_inode(object->dentry);
+ if (inode)
+ i_blocks = inode->i_blocks;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ cachefiles_delete_object(cache, object);
+ cachefiles_end_secure(cache, saved_cred);
+ }
+
+ /* close the filesystem stuff attached to the object */
+ if (object->backer != object->dentry)
+ dput(object->backer);
+ object->backer = NULL;
+ }
+
+ /* note that the object is now inactive */
+ if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags))
+ cachefiles_mark_object_inactive(cache, object, i_blocks);
+
+ dput(object->dentry);
+ object->dentry = NULL;
+
+ _leave("");
+}
+
+/*
+ * dispose of a reference to an object
+ */
+void cachefiles_put_object(struct fscache_object *_object,
+ enum fscache_obj_ref_trace why)
+{
+ struct cachefiles_object *object;
+ struct fscache_cache *cache;
+ int u;
+
+ ASSERT(_object);
+
+ object = container_of(_object, struct cachefiles_object, fscache);
+
+ _enter("{OBJ%x,%d}",
+ object->fscache.debug_id, atomic_read(&object->usage));
+
+#ifdef CACHEFILES_DEBUG_SLAB
+ ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
+#endif
+
+ ASSERTIFCMP(object->fscache.parent,
+ object->fscache.parent->n_children, >, 0);
+
+ u = atomic_dec_return(&object->usage);
+ trace_cachefiles_ref(object, _object->cookie,
+ (enum cachefiles_obj_ref_trace)why, u);
+ ASSERTCMP(u, !=, -1);
+ if (u == 0) {
+ _debug("- kill object OBJ%x", object->fscache.debug_id);
+
+ ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
+ ASSERTCMP(object->fscache.parent, ==, NULL);
+ ASSERTCMP(object->backer, ==, NULL);
+ ASSERTCMP(object->dentry, ==, NULL);
+ ASSERTCMP(object->fscache.n_ops, ==, 0);
+ ASSERTCMP(object->fscache.n_children, ==, 0);
+
+ if (object->lookup_data) {
+ kfree(object->lookup_data->key);
+ kfree(object->lookup_data->auxdata);
+ kfree(object->lookup_data);
+ object->lookup_data = NULL;
+ }
+
+ cache = object->fscache.cache;
+ fscache_object_destroy(&object->fscache);
+ kmem_cache_free(cachefiles_object_jar, object);
+ fscache_object_destroyed(cache);
+ }
+
+ _leave("");
+}
+
+/*
+ * sync a cache
+ */
+static void cachefiles_sync_cache(struct fscache_cache *_cache)
+{
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter("%s", _cache->tag->name);
+
+ cache = container_of(_cache, struct cachefiles_cache, cache);
+
+ /* make sure all pages pinned by operations on behalf of the netfs are
+ * written to disc */
+ cachefiles_begin_secure(cache, &saved_cred);
+ down_read(&cache->mnt->mnt_sb->s_umount);
+ ret = sync_filesystem(cache->mnt->mnt_sb);
+ up_read(&cache->mnt->mnt_sb->s_umount);
+ cachefiles_end_secure(cache, saved_cred);
+
+ if (ret == -EIO)
+ cachefiles_io_error(cache,
+ "Attempt to sync backing fs superblock"
+ " returned error %d",
+ ret);
+}
+
+/*
+ * check if the backing cache is updated to FS-Cache
+ * - called by FS-Cache when evaluates if need to invalidate the cache
+ */
+static int cachefiles_check_consistency(struct fscache_operation *op)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter("{OBJ%x}", op->object->debug_id);
+
+ object = container_of(op->object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = cachefiles_check_auxdata(object);
+ cachefiles_end_secure(cache, saved_cred);
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * notification the attributes on an object have changed
+ * - called with reads/writes excluded by FS-Cache
+ */
+static int cachefiles_attr_changed(struct fscache_object *_object)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ struct iattr newattrs;
+ uint64_t ni_size;
+ loff_t oi_size;
+ int ret;
+
+ ni_size = _object->store_limit_l;
+
+ _enter("{OBJ%x},[%llu]",
+ _object->debug_id, (unsigned long long) ni_size);
+
+ object = container_of(_object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+
+ if (ni_size == object->i_size)
+ return 0;
+
+ if (!object->backer)
+ return -ENOBUFS;
+
+ ASSERT(d_is_reg(object->backer));
+
+ fscache_set_store_limit(&object->fscache, ni_size);
+
+ oi_size = i_size_read(d_backing_inode(object->backer));
+ if (oi_size == ni_size)
+ return 0;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ inode_lock(d_inode(object->backer));
+
+ /* if there's an extension to a partial page at the end of the backing
+ * file, we need to discard the partial page so that we pick up new
+ * data after it */
+ if (oi_size & ~PAGE_MASK && ni_size > oi_size) {
+ _debug("discard tail %llx", oi_size);
+ newattrs.ia_valid = ATTR_SIZE;
+ newattrs.ia_size = oi_size & PAGE_MASK;
+ ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
+ if (ret < 0)
+ goto truncate_failed;
+ }
+
+ newattrs.ia_valid = ATTR_SIZE;
+ newattrs.ia_size = ni_size;
+ ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
+
+truncate_failed:
+ inode_unlock(d_inode(object->backer));
+ cachefiles_end_secure(cache, saved_cred);
+
+ if (ret == -EIO) {
+ fscache_set_store_limit(&object->fscache, 0);
+ cachefiles_io_error_obj(object, "Size set failed");
+ ret = -ENOBUFS;
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Invalidate an object
+ */
+static void cachefiles_invalidate_object(struct fscache_operation *op)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ struct path path;
+ uint64_t ni_size;
+ int ret;
+
+ object = container_of(op->object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+
+ ni_size = op->object->store_limit_l;
+
+ _enter("{OBJ%x},[%llu]",
+ op->object->debug_id, (unsigned long long)ni_size);
+
+ if (object->backer) {
+ ASSERT(d_is_reg(object->backer));
+
+ fscache_set_store_limit(&object->fscache, ni_size);
+
+ path.dentry = object->backer;
+ path.mnt = cache->mnt;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = vfs_truncate(&path, 0);
+ if (ret == 0)
+ ret = vfs_truncate(&path, ni_size);
+ cachefiles_end_secure(cache, saved_cred);
+
+ if (ret != 0) {
+ fscache_set_store_limit(&object->fscache, 0);
+ if (ret == -EIO)
+ cachefiles_io_error_obj(object,
+ "Invalidate failed");
+ }
+ }
+
+ fscache_op_complete(op, true);
+ _leave("");
+}
+
+const struct fscache_cache_ops cachefiles_cache_ops = {
+ .name = "cachefiles",
+ .alloc_object = cachefiles_alloc_object,
+ .lookup_object = cachefiles_lookup_object,
+ .lookup_complete = cachefiles_lookup_complete,
+ .grab_object = cachefiles_grab_object,
+ .update_object = cachefiles_update_object,
+ .invalidate_object = cachefiles_invalidate_object,
+ .drop_object = cachefiles_drop_object,
+ .put_object = cachefiles_put_object,
+ .sync_cache = cachefiles_sync_cache,
+ .attr_changed = cachefiles_attr_changed,
+ .check_consistency = cachefiles_check_consistency,
+ .begin_operation = cachefiles_begin_operation,
+};
diff --git a/fs/cachefiles_old/internal.h b/fs/cachefiles_old/internal.h
new file mode 100644
index 000000000000..28351d62d8d2
--- /dev/null
+++ b/fs/cachefiles_old/internal.h
@@ -0,0 +1,312 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* General netfs cache on cache files internal defs
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+
+#define pr_fmt(fmt) "CacheFiles: " fmt
+
+
+#include <linux/fscache_old-cache.h>
+#include <linux/timer.h>
+#include <linux/wait_bit.h>
+#include <linux/cred.h>
+#include <linux/workqueue.h>
+#include <linux/security.h>
+
+struct cachefiles_cache;
+struct cachefiles_object;
+
+extern unsigned cachefiles_debug;
+#define CACHEFILES_DEBUG_KENTER 1
+#define CACHEFILES_DEBUG_KLEAVE 2
+#define CACHEFILES_DEBUG_KDEBUG 4
+
+#define cachefiles_gfp (__GFP_RECLAIM | __GFP_NORETRY | __GFP_NOMEMALLOC)
+
+/*
+ * node records
+ */
+struct cachefiles_object {
+ struct fscache_object fscache; /* fscache handle */
+ struct cachefiles_lookup_data *lookup_data; /* cached lookup data */
+ struct dentry *dentry; /* the file/dir representing this object */
+ struct dentry *backer; /* backing file */
+ loff_t i_size; /* object size */
+ unsigned long flags;
+#define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */
+ atomic_t usage; /* object usage count */
+ uint8_t type; /* object type */
+ uint8_t new; /* T if object new */
+ struct rb_node active_node; /* link in active tree (dentry is key) */
+};
+
+extern struct kmem_cache *cachefiles_object_jar;
+
+/*
+ * Cache files cache definition
+ */
+struct cachefiles_cache {
+ struct fscache_cache cache; /* FS-Cache record */
+ struct vfsmount *mnt; /* mountpoint holding the cache */
+ struct dentry *graveyard; /* directory into which dead objects go */
+ struct file *cachefilesd; /* manager daemon handle */
+ const struct cred *cache_cred; /* security override for accessing cache */
+ struct mutex daemon_mutex; /* command serialisation mutex */
+ wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
+ struct rb_root active_nodes; /* active nodes (can't be culled) */
+ rwlock_t active_lock; /* lock for active_nodes */
+ atomic_t gravecounter; /* graveyard uniquifier */
+ atomic_t f_released; /* number of objects released lately */
+ atomic_long_t b_released; /* number of blocks released lately */
+ unsigned frun_percent; /* when to stop culling (% files) */
+ unsigned fcull_percent; /* when to start culling (% files) */
+ unsigned fstop_percent; /* when to stop allocating (% files) */
+ unsigned brun_percent; /* when to stop culling (% blocks) */
+ unsigned bcull_percent; /* when to start culling (% blocks) */
+ unsigned bstop_percent; /* when to stop allocating (% blocks) */
+ unsigned bsize; /* cache's block size */
+ unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
+ uint64_t frun; /* when to stop culling */
+ uint64_t fcull; /* when to start culling */
+ uint64_t fstop; /* when to stop allocating */
+ sector_t brun; /* when to stop culling */
+ sector_t bcull; /* when to start culling */
+ sector_t bstop; /* when to stop allocating */
+ unsigned long flags;
+#define CACHEFILES_READY 0 /* T if cache prepared */
+#define CACHEFILES_DEAD 1 /* T if cache dead */
+#define CACHEFILES_CULLING 2 /* T if cull engaged */
+#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
+ char *rootdirname; /* name of cache root directory */
+ char *secctx; /* LSM security context */
+ char *tag; /* cache binding tag */
+};
+
+/*
+ * auxiliary data xattr buffer
+ */
+struct cachefiles_xattr {
+ uint16_t len;
+ uint8_t type;
+ uint8_t data[];
+};
+
+#include <trace/events/cachefiles_old.h>
+
+/*
+ * note change of state for daemon
+ */
+static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
+{
+ set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
+ wake_up_all(&cache->daemon_pollwq);
+}
+
+/*
+ * bind.c
+ */
+extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args);
+extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
+
+/*
+ * daemon.c
+ */
+extern const struct file_operations cachefiles_daemon_fops;
+
+extern int cachefiles_has_space(struct cachefiles_cache *cache,
+ unsigned fnr, unsigned bnr);
+
+/*
+ * interface.c
+ */
+extern const struct fscache_cache_ops cachefiles_cache_ops;
+
+void cachefiles_put_object(struct fscache_object *_object,
+ enum fscache_obj_ref_trace why);
+
+/*
+ * key.c
+ */
+extern char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type);
+
+/*
+ * namei.c
+ */
+extern void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
+ struct cachefiles_object *object,
+ blkcnt_t i_blocks);
+extern int cachefiles_delete_object(struct cachefiles_cache *cache,
+ struct cachefiles_object *object);
+extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
+ struct cachefiles_object *object,
+ const char *key,
+ struct cachefiles_xattr *auxdata);
+extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
+ struct dentry *dir,
+ const char *name);
+
+extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
+ char *filename);
+
+extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
+ struct dentry *dir, char *filename);
+
+/*
+ * rdwr2.c
+ */
+extern int cachefiles_begin_operation(struct netfs_cache_resources *,
+ struct fscache_operation *);
+
+/*
+ * security.c
+ */
+extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
+extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
+ struct dentry *root,
+ const struct cred **_saved_cred);
+
+static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
+ const struct cred **_saved_cred)
+{
+ *_saved_cred = override_creds(cache->cache_cred);
+}
+
+static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
+ const struct cred *saved_cred)
+{
+ revert_creds(saved_cred);
+}
+
+/*
+ * xattr.c
+ */
+extern int cachefiles_check_object_type(struct cachefiles_object *object);
+extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
+ struct cachefiles_xattr *auxdata);
+extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
+ struct cachefiles_xattr *auxdata);
+extern int cachefiles_check_auxdata(struct cachefiles_object *object);
+extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
+ struct cachefiles_xattr *auxdata);
+extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
+ struct dentry *dentry);
+
+
+/*
+ * error handling
+ */
+
+#define cachefiles_io_error(___cache, FMT, ...) \
+do { \
+ pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \
+ fscache_io_error(&(___cache)->cache); \
+ set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
+} while (0)
+
+#define cachefiles_io_error_obj(object, FMT, ...) \
+do { \
+ struct cachefiles_cache *___cache; \
+ \
+ ___cache = container_of((object)->fscache.cache, \
+ struct cachefiles_cache, cache); \
+ cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
+} while (0)
+
+
+/*
+ * debug tracing
+ */
+#define dbgprintk(FMT, ...) \
+ printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
+
+#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
+
+
+#if defined(__KDEBUG)
+#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
+#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
+#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
+
+#elif defined(CONFIG_CACHEFILES_DEBUG)
+#define _enter(FMT, ...) \
+do { \
+ if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
+ kenter(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _leave(FMT, ...) \
+do { \
+ if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
+ kleave(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _debug(FMT, ...) \
+do { \
+ if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
+ kdebug(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#else
+#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
+#endif
+
+#if 1 /* defined(__KDEBUGALL) */
+
+#define ASSERT(X) \
+do { \
+ if (unlikely(!(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+ if (unlikely(!((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIF(C, X) \
+do { \
+ if (unlikely((C) && !(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+ if (unlikely((C) && !((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#else
+
+#define ASSERT(X) do {} while (0)
+#define ASSERTCMP(X, OP, Y) do {} while (0)
+#define ASSERTIF(C, X) do {} while (0)
+#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
+
+#endif
diff --git a/fs/cachefiles_old/io.c b/fs/cachefiles_old/io.c
new file mode 100644
index 000000000000..5ead97de4bb7
--- /dev/null
+++ b/fs/cachefiles_old/io.c
@@ -0,0 +1,445 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* kiocb-using read/write
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/uio.h>
+#include <linux/sched/mm.h>
+#include <linux/netfs.h>
+#include "internal.h"
+
+struct cachefiles_kiocb {
+ struct kiocb iocb;
+ refcount_t ki_refcnt;
+ loff_t start;
+ union {
+ size_t skipped;
+ size_t len;
+ };
+ netfs_io_terminated_t term_func;
+ void *term_func_priv;
+ bool was_async;
+};
+
+static inline void cachefiles_put_kiocb(struct cachefiles_kiocb *ki)
+{
+ if (refcount_dec_and_test(&ki->ki_refcnt)) {
+ fput(ki->iocb.ki_filp);
+ kfree(ki);
+ }
+}
+
+/*
+ * Handle completion of a read from the cache.
+ */
+static void cachefiles_read_complete(struct kiocb *iocb, long ret, long ret2)
+{
+ struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb);
+
+ _enter("%ld,%ld", ret, ret2);
+
+ if (ki->term_func) {
+ if (ret >= 0)
+ ret += ki->skipped;
+ ki->term_func(ki->term_func_priv, ret, ki->was_async);
+ }
+
+ cachefiles_put_kiocb(ki);
+}
+
+/*
+ * Initiate a read from the cache.
+ */
+static int cachefiles_read(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ enum netfs_read_from_hole read_hole,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ struct cachefiles_kiocb *ki;
+ struct file *file = cres->cache_priv2;
+ unsigned int old_nofs;
+ ssize_t ret = -ENODATA;
+ size_t len = iov_iter_count(iter), skipped = 0;
+
+ _enter("%pD,%li,%llx,%zx/%llx",
+ file, file_inode(file)->i_ino, start_pos, len,
+ i_size_read(file_inode(file)));
+
+ /* If the caller asked us to seek for data before doing the read, then
+ * we should do that now. If we find a gap, we fill it with zeros.
+ */
+ if (read_hole != NETFS_READ_HOLE_IGNORE) {
+ loff_t off = start_pos, off2;
+
+ off2 = vfs_llseek(file, off, SEEK_DATA);
+ if (off2 < 0 && off2 >= (loff_t)-MAX_ERRNO && off2 != -ENXIO) {
+ skipped = 0;
+ ret = off2;
+ goto presubmission_error;
+ }
+
+ if (off2 == -ENXIO || off2 >= start_pos + len) {
+ /* The region is beyond the EOF or there's no more data
+ * in the region, so clear the rest of the buffer and
+ * return success.
+ */
+ if (read_hole == NETFS_READ_HOLE_FAIL)
+ goto presubmission_error;
+
+ iov_iter_zero(len, iter);
+ skipped = len;
+ ret = 0;
+ goto presubmission_error;
+ }
+
+ skipped = off2 - off;
+ iov_iter_zero(skipped, iter);
+ }
+
+ ret = -ENOBUFS;
+ ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
+ if (!ki)
+ goto presubmission_error;
+
+ refcount_set(&ki->ki_refcnt, 2);
+ ki->iocb.ki_filp = file;
+ ki->iocb.ki_pos = start_pos + skipped;
+ ki->iocb.ki_flags = IOCB_DIRECT;
+ ki->iocb.ki_hint = ki_hint_validate(file_write_hint(file));
+ ki->iocb.ki_ioprio = get_current_ioprio();
+ ki->skipped = skipped;
+ ki->term_func = term_func;
+ ki->term_func_priv = term_func_priv;
+ ki->was_async = true;
+
+ if (ki->term_func)
+ ki->iocb.ki_complete = cachefiles_read_complete;
+
+ get_file(ki->iocb.ki_filp);
+
+ old_nofs = memalloc_nofs_save();
+ ret = vfs_iocb_iter_read(file, &ki->iocb, iter);
+ memalloc_nofs_restore(old_nofs);
+ switch (ret) {
+ case -EIOCBQUEUED:
+ goto in_progress;
+
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ case -ERESTARTNOHAND:
+ case -ERESTART_RESTARTBLOCK:
+ /* There's no easy way to restart the syscall since other AIO's
+ * may be already running. Just fail this IO with EINTR.
+ */
+ ret = -EINTR;
+ fallthrough;
+ default:
+ ki->was_async = false;
+ cachefiles_read_complete(&ki->iocb, ret, 0);
+ if (ret > 0)
+ ret = 0;
+ break;
+ }
+
+in_progress:
+ cachefiles_put_kiocb(ki);
+ _leave(" = %zd", ret);
+ return ret;
+
+presubmission_error:
+ if (term_func)
+ term_func(term_func_priv, ret < 0 ? ret : skipped, false);
+ return ret;
+}
+
+/*
+ * Handle completion of a write to the cache.
+ */
+static void cachefiles_write_complete(struct kiocb *iocb, long ret, long ret2)
+{
+ struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb);
+ struct inode *inode = file_inode(ki->iocb.ki_filp);
+
+ _enter("%ld,%ld", ret, ret2);
+
+ /* Tell lockdep we inherited freeze protection from submission thread */
+ __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
+ __sb_end_write(inode->i_sb, SB_FREEZE_WRITE);
+
+ if (ki->term_func)
+ ki->term_func(ki->term_func_priv, ret, ki->was_async);
+
+ cachefiles_put_kiocb(ki);
+}
+
+/*
+ * Initiate a write to the cache.
+ */
+static int cachefiles_write(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ struct cachefiles_kiocb *ki;
+ struct inode *inode;
+ struct file *file = cres->cache_priv2;
+ unsigned int old_nofs;
+ ssize_t ret = -ENOBUFS;
+ size_t len = iov_iter_count(iter);
+
+ _enter("%pD,%li,%llx,%zx/%llx",
+ file, file_inode(file)->i_ino, start_pos, len,
+ i_size_read(file_inode(file)));
+
+ ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
+ if (!ki)
+ goto presubmission_error;
+
+ refcount_set(&ki->ki_refcnt, 2);
+ ki->iocb.ki_filp = file;
+ ki->iocb.ki_pos = start_pos;
+ ki->iocb.ki_flags = IOCB_DIRECT | IOCB_WRITE;
+ ki->iocb.ki_hint = ki_hint_validate(file_write_hint(file));
+ ki->iocb.ki_ioprio = get_current_ioprio();
+ ki->start = start_pos;
+ ki->len = len;
+ ki->term_func = term_func;
+ ki->term_func_priv = term_func_priv;
+ ki->was_async = true;
+
+ if (ki->term_func)
+ ki->iocb.ki_complete = cachefiles_write_complete;
+
+ /* Open-code file_start_write here to grab freeze protection, which
+ * will be released by another thread in aio_complete_rw(). Fool
+ * lockdep by telling it the lock got released so that it doesn't
+ * complain about the held lock when we return to userspace.
+ */
+ inode = file_inode(file);
+ __sb_start_write(inode->i_sb, SB_FREEZE_WRITE);
+ __sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);
+
+ get_file(ki->iocb.ki_filp);
+
+ old_nofs = memalloc_nofs_save();
+ ret = vfs_iocb_iter_write(file, &ki->iocb, iter);
+ memalloc_nofs_restore(old_nofs);
+ switch (ret) {
+ case -EIOCBQUEUED:
+ goto in_progress;
+
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ case -ERESTARTNOHAND:
+ case -ERESTART_RESTARTBLOCK:
+ /* There's no easy way to restart the syscall since other AIO's
+ * may be already running. Just fail this IO with EINTR.
+ */
+ ret = -EINTR;
+ fallthrough;
+ default:
+ ki->was_async = false;
+ cachefiles_write_complete(&ki->iocb, ret, 0);
+ if (ret > 0)
+ ret = 0;
+ break;
+ }
+
+in_progress:
+ cachefiles_put_kiocb(ki);
+ _leave(" = %zd", ret);
+ return ret;
+
+presubmission_error:
+ if (term_func)
+ term_func(term_func_priv, -ENOMEM, false);
+ return -ENOMEM;
+}
+
+/*
+ * Prepare a read operation, shortening it to a cached/uncached
+ * boundary as appropriate.
+ */
+static enum netfs_read_source cachefiles_prepare_read(struct netfs_read_subrequest *subreq,
+ loff_t i_size)
+{
+ struct fscache_operation *op = subreq->rreq->cache_resources.cache_priv;
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ struct file *file = subreq->rreq->cache_resources.cache_priv2;
+ enum netfs_read_source ret = NETFS_DOWNLOAD_FROM_SERVER;
+ loff_t off, to;
+
+ _enter("%zx @%llx/%llx", subreq->len, subreq->start, i_size);
+
+ object = container_of(op->object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+
+ cachefiles_begin_secure(cache, &saved_cred);
+
+ if (subreq->start >= i_size) {
+ ret = NETFS_FILL_WITH_ZEROES;
+ goto out;
+ }
+
+ if (!file)
+ goto out;
+
+ if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->fscache.cookie->flags))
+ goto download_and_store;
+
+ off = vfs_llseek(file, subreq->start, SEEK_DATA);
+ if (off < 0 && off >= (loff_t)-MAX_ERRNO) {
+ if (off == (loff_t)-ENXIO)
+ goto download_and_store;
+ goto out;
+ }
+
+ if (off >= subreq->start + subreq->len)
+ goto download_and_store;
+
+ if (off > subreq->start) {
+ off = round_up(off, cache->bsize);
+ subreq->len = off - subreq->start;
+ goto download_and_store;
+ }
+
+ to = vfs_llseek(file, subreq->start, SEEK_HOLE);
+ if (to < 0 && to >= (loff_t)-MAX_ERRNO)
+ goto out;
+
+ if (to < subreq->start + subreq->len) {
+ if (subreq->start + subreq->len >= i_size)
+ to = round_up(to, cache->bsize);
+ else
+ to = round_down(to, cache->bsize);
+ subreq->len = to - subreq->start;
+ }
+
+ ret = NETFS_READ_FROM_CACHE;
+ goto out;
+
+download_and_store:
+ if (cachefiles_has_space(cache, 0, (subreq->len + PAGE_SIZE - 1) / PAGE_SIZE) == 0)
+ __set_bit(NETFS_SREQ_WRITE_TO_CACHE, &subreq->flags);
+out:
+ cachefiles_end_secure(cache, saved_cred);
+ return ret;
+}
+
+/*
+ * Prepare for a write to occur.
+ */
+static int cachefiles_prepare_write(struct netfs_cache_resources *cres,
+ loff_t *_start, size_t *_len, loff_t i_size)
+{
+ loff_t start = *_start;
+ size_t len = *_len, down;
+
+ /* Round to DIO size */
+ down = start - round_down(start, PAGE_SIZE);
+ *_start = start - down;
+ *_len = round_up(down + len, PAGE_SIZE);
+ return 0;
+}
+
+/*
+ * Prepare for a write to occur from the fallback I/O API.
+ */
+static int cachefiles_prepare_fallback_write(struct netfs_cache_resources *cres,
+ pgoff_t index)
+{
+ struct fscache_operation *op = cres->cache_priv;
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+
+ _enter("%lx", index);
+
+ object = container_of(op->object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+ return cachefiles_has_space(cache, 0, 1);
+}
+
+/*
+ * Clean up an operation.
+ */
+static void cachefiles_end_operation(struct netfs_cache_resources *cres)
+{
+ struct fscache_operation *op = cres->cache_priv;
+ struct file *file = cres->cache_priv2;
+
+ _enter("");
+
+ if (file)
+ fput(file);
+ if (op) {
+ fscache_op_complete(op, false);
+ fscache_put_operation(op);
+ }
+
+ _leave("");
+}
+
+static const struct netfs_cache_ops cachefiles_netfs_cache_ops = {
+ .end_operation = cachefiles_end_operation,
+ .read = cachefiles_read,
+ .write = cachefiles_write,
+ .prepare_read = cachefiles_prepare_read,
+ .prepare_write = cachefiles_prepare_write,
+ .prepare_fallback_write = cachefiles_prepare_fallback_write,
+};
+
+/*
+ * Open the cache file when beginning a cache operation.
+ */
+int cachefiles_begin_operation(struct netfs_cache_resources *cres,
+ struct fscache_operation *op)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ struct path path;
+ struct file *file;
+
+ _enter("");
+
+ object = container_of(op->object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+
+ path.mnt = cache->mnt;
+ path.dentry = object->backer;
+ file = open_with_fake_path(&path, O_RDWR | O_LARGEFILE | O_DIRECT,
+ d_inode(object->backer), cache->cache_cred);
+ if (IS_ERR(file))
+ return PTR_ERR(file);
+ if (!S_ISREG(file_inode(file)->i_mode))
+ goto error_file;
+ if (unlikely(!file->f_op->read_iter) ||
+ unlikely(!file->f_op->write_iter)) {
+ pr_notice("Cache does not support read_iter and write_iter\n");
+ goto error_file;
+ }
+
+ atomic_inc(&op->usage);
+ cres->cache_priv = op;
+ cres->cache_priv2 = file;
+ cres->ops = &cachefiles_netfs_cache_ops;
+ cres->debug_id = object->fscache.debug_id;
+ _leave("");
+ return 0;
+
+error_file:
+ fput(file);
+ return -EIO;
+}
diff --git a/fs/cachefiles_old/key.c b/fs/cachefiles_old/key.c
new file mode 100644
index 000000000000..7f94efc97e23
--- /dev/null
+++ b/fs/cachefiles_old/key.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Key to pathname encoder
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/slab.h>
+#include "internal.h"
+
+static const char cachefiles_charmap[64] =
+ "0123456789" /* 0 - 9 */
+ "abcdefghijklmnopqrstuvwxyz" /* 10 - 35 */
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" /* 36 - 61 */
+ "_-" /* 62 - 63 */
+ ;
+
+static const char cachefiles_filecharmap[256] = {
+ /* we skip space and tab and control chars */
+ [33 ... 46] = 1, /* '!' -> '.' */
+ /* we skip '/' as it's significant to pathwalk */
+ [48 ... 127] = 1, /* '0' -> '~' */
+};
+
+/*
+ * turn the raw key into something cooked
+ * - the raw key should include the length in the two bytes at the front
+ * - the key may be up to 514 bytes in length (including the length word)
+ * - "base64" encode the strange keys, mapping 3 bytes of raw to four of
+ * cooked
+ * - need to cut the cooked key into 252 char lengths (189 raw bytes)
+ */
+char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type)
+{
+ unsigned char csum, ch;
+ unsigned int acc;
+ char *key;
+ int loop, len, max, seg, mark, print;
+
+ _enter(",%d", keylen);
+
+ BUG_ON(keylen < 2 || keylen > 514);
+
+ csum = raw[0] + raw[1];
+ print = 1;
+ for (loop = 2; loop < keylen; loop++) {
+ ch = raw[loop];
+ csum += ch;
+ print &= cachefiles_filecharmap[ch];
+ }
+
+ if (print) {
+ /* if the path is usable ASCII, then we render it directly */
+ max = keylen - 2;
+ max += 2; /* two base64'd length chars on the front */
+ max += 5; /* @checksum/M */
+ max += 3 * 2; /* maximum number of segment dividers (".../M")
+ * is ((514 + 251) / 252) = 3
+ */
+ max += 1; /* NUL on end */
+ } else {
+ /* calculate the maximum length of the cooked key */
+ keylen = (keylen + 2) / 3;
+
+ max = keylen * 4;
+ max += 5; /* @checksum/M */
+ max += 3 * 2; /* maximum number of segment dividers (".../M")
+ * is ((514 + 188) / 189) = 3
+ */
+ max += 1; /* NUL on end */
+ }
+
+ max += 1; /* 2nd NUL on end */
+
+ _debug("max: %d", max);
+
+ key = kmalloc(max, cachefiles_gfp);
+ if (!key)
+ return NULL;
+
+ len = 0;
+
+ /* build the cooked key */
+ sprintf(key, "@%02x%c+", (unsigned) csum, 0);
+ len = 5;
+ mark = len - 1;
+
+ if (print) {
+ acc = *(uint16_t *) raw;
+ raw += 2;
+
+ key[len + 1] = cachefiles_charmap[acc & 63];
+ acc >>= 6;
+ key[len] = cachefiles_charmap[acc & 63];
+ len += 2;
+
+ seg = 250;
+ for (loop = keylen; loop > 0; loop--) {
+ if (seg <= 0) {
+ key[len++] = '\0';
+ mark = len;
+ key[len++] = '+';
+ seg = 252;
+ }
+
+ key[len++] = *raw++;
+ ASSERT(len < max);
+ }
+
+ switch (type) {
+ case FSCACHE_COOKIE_TYPE_INDEX: type = 'I'; break;
+ case FSCACHE_COOKIE_TYPE_DATAFILE: type = 'D'; break;
+ default: type = 'S'; break;
+ }
+ } else {
+ seg = 252;
+ for (loop = keylen; loop > 0; loop--) {
+ if (seg <= 0) {
+ key[len++] = '\0';
+ mark = len;
+ key[len++] = '+';
+ seg = 252;
+ }
+
+ acc = *raw++;
+ acc |= *raw++ << 8;
+ acc |= *raw++ << 16;
+
+ _debug("acc: %06x", acc);
+
+ key[len++] = cachefiles_charmap[acc & 63];
+ acc >>= 6;
+ key[len++] = cachefiles_charmap[acc & 63];
+ acc >>= 6;
+ key[len++] = cachefiles_charmap[acc & 63];
+ acc >>= 6;
+ key[len++] = cachefiles_charmap[acc & 63];
+
+ ASSERT(len < max);
+ }
+
+ switch (type) {
+ case FSCACHE_COOKIE_TYPE_INDEX: type = 'J'; break;
+ case FSCACHE_COOKIE_TYPE_DATAFILE: type = 'E'; break;
+ default: type = 'T'; break;
+ }
+ }
+
+ key[mark] = type;
+ key[len++] = 0;
+ key[len] = 0;
+
+ _leave(" = %s %d", key, len);
+ return key;
+}
diff --git a/fs/cachefiles_old/main.c b/fs/cachefiles_old/main.c
new file mode 100644
index 000000000000..d3115106b22b
--- /dev/null
+++ b/fs/cachefiles_old/main.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Network filesystem caching backend to use cache files on a premounted
+ * filesystem
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/sysctl.h>
+#include <linux/miscdevice.h>
+#define CREATE_TRACE_POINTS
+#include "internal.h"
+
+unsigned cachefiles_debug;
+module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
+
+MODULE_DESCRIPTION("Mounted-filesystem based cache");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+struct kmem_cache *cachefiles_object_jar;
+
+static struct miscdevice cachefiles_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "cachefiles",
+ .fops = &cachefiles_daemon_fops,
+};
+
+static void cachefiles_object_init_once(void *_object)
+{
+ struct cachefiles_object *object = _object;
+
+ memset(object, 0, sizeof(*object));
+}
+
+/*
+ * initialise the fs caching module
+ */
+static int __init cachefiles_init(void)
+{
+ int ret;
+
+ ret = misc_register(&cachefiles_dev);
+ if (ret < 0)
+ goto error_dev;
+
+ /* create an object jar */
+ ret = -ENOMEM;
+ cachefiles_object_jar =
+ kmem_cache_create("cachefiles_object_jar",
+ sizeof(struct cachefiles_object),
+ 0,
+ SLAB_HWCACHE_ALIGN,
+ cachefiles_object_init_once);
+ if (!cachefiles_object_jar) {
+ pr_notice("Failed to allocate an object jar\n");
+ goto error_object_jar;
+ }
+
+ pr_info("Loaded\n");
+ return 0;
+
+error_object_jar:
+ misc_deregister(&cachefiles_dev);
+error_dev:
+ pr_err("failed to register: %d\n", ret);
+ return ret;
+}
+
+fs_initcall(cachefiles_init);
+
+/*
+ * clean up on module removal
+ */
+static void __exit cachefiles_exit(void)
+{
+ pr_info("Unloading\n");
+
+ kmem_cache_destroy(cachefiles_object_jar);
+ misc_deregister(&cachefiles_dev);
+}
+
+module_exit(cachefiles_exit);
diff --git a/fs/cachefiles_old/namei.c b/fs/cachefiles_old/namei.c
new file mode 100644
index 000000000000..a9aca5ab5970
--- /dev/null
+++ b/fs/cachefiles_old/namei.c
@@ -0,0 +1,1018 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* CacheFiles path walking and related routines
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/fsnotify.h>
+#include <linux/quotaops.h>
+#include <linux/xattr.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+#define CACHEFILES_KEYBUF_SIZE 512
+
+/*
+ * dump debugging info about an object
+ */
+static noinline
+void __cachefiles_printk_object(struct cachefiles_object *object,
+ const char *prefix)
+{
+ struct fscache_cookie *cookie;
+ const u8 *k;
+ unsigned loop;
+
+ pr_err("%sobject: OBJ%x\n", prefix, object->fscache.debug_id);
+ pr_err("%sobjstate=%s fl=%lx wbusy=%x ev=%lx[%lx]\n",
+ prefix, object->fscache.state->name,
+ object->fscache.flags, work_busy(&object->fscache.work),
+ object->fscache.events, object->fscache.event_mask);
+ pr_err("%sops=%u inp=%u exc=%u\n",
+ prefix, object->fscache.n_ops, object->fscache.n_in_progress,
+ object->fscache.n_exclusive);
+ pr_err("%sparent=%x\n",
+ prefix, object->fscache.parent ? object->fscache.parent->debug_id : 0);
+
+ spin_lock(&object->fscache.lock);
+ cookie = object->fscache.cookie;
+ if (cookie) {
+ pr_err("%scookie=%x [pr=%x nd=%p fl=%lx]\n",
+ prefix,
+ cookie->debug_id,
+ cookie->parent ? cookie->parent->debug_id : 0,
+ cookie->netfs_data,
+ cookie->flags);
+ pr_err("%skey=[%u] '", prefix, cookie->key_len);
+ k = (cookie->key_len <= sizeof(cookie->inline_key)) ?
+ cookie->inline_key : cookie->key;
+ for (loop = 0; loop < cookie->key_len; loop++)
+ pr_cont("%02x", k[loop]);
+ pr_cont("'\n");
+ } else {
+ pr_err("%scookie=NULL\n", prefix);
+ }
+ spin_unlock(&object->fscache.lock);
+}
+
+/*
+ * dump debugging info about a pair of objects
+ */
+static noinline void cachefiles_printk_object(struct cachefiles_object *object,
+ struct cachefiles_object *xobject)
+{
+ if (object)
+ __cachefiles_printk_object(object, "");
+ if (xobject)
+ __cachefiles_printk_object(xobject, "x");
+}
+
+/*
+ * mark the owner of a dentry, if there is one, to indicate that that dentry
+ * has been preemptively deleted
+ * - the caller must hold the i_mutex on the dentry's parent as required to
+ * call vfs_unlink(), vfs_rmdir() or vfs_rename()
+ */
+static void cachefiles_mark_object_buried(struct cachefiles_cache *cache,
+ struct dentry *dentry,
+ enum fscache_why_object_killed why)
+{
+ struct cachefiles_object *object;
+ struct rb_node *p;
+
+ _enter(",'%pd'", dentry);
+
+ write_lock(&cache->active_lock);
+
+ p = cache->active_nodes.rb_node;
+ while (p) {
+ object = rb_entry(p, struct cachefiles_object, active_node);
+ if (object->dentry > dentry)
+ p = p->rb_left;
+ else if (object->dentry < dentry)
+ p = p->rb_right;
+ else
+ goto found_dentry;
+ }
+
+ write_unlock(&cache->active_lock);
+ trace_cachefiles_mark_buried(NULL, dentry, why);
+ _leave(" [no owner]");
+ return;
+
+ /* found the dentry for */
+found_dentry:
+ kdebug("preemptive burial: OBJ%x [%s] %pd",
+ object->fscache.debug_id,
+ object->fscache.state->name,
+ dentry);
+
+ trace_cachefiles_mark_buried(object, dentry, why);
+
+ if (fscache_object_is_live(&object->fscache)) {
+ pr_err("\n");
+ pr_err("Error: Can't preemptively bury live object\n");
+ cachefiles_printk_object(object, NULL);
+ } else {
+ if (why != FSCACHE_OBJECT_IS_STALE)
+ fscache_object_mark_killed(&object->fscache, why);
+ }
+
+ write_unlock(&cache->active_lock);
+ _leave(" [owner marked]");
+}
+
+/*
+ * record the fact that an object is now active
+ */
+static int cachefiles_mark_object_active(struct cachefiles_cache *cache,
+ struct cachefiles_object *object)
+{
+ struct cachefiles_object *xobject;
+ struct rb_node **_p, *_parent = NULL;
+ struct dentry *dentry;
+
+ _enter(",%x", object->fscache.debug_id);
+
+try_again:
+ write_lock(&cache->active_lock);
+
+ dentry = object->dentry;
+ trace_cachefiles_mark_active(object, dentry);
+
+ if (test_and_set_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)) {
+ pr_err("Error: Object already active\n");
+ cachefiles_printk_object(object, NULL);
+ BUG();
+ }
+
+ _p = &cache->active_nodes.rb_node;
+ while (*_p) {
+ _parent = *_p;
+ xobject = rb_entry(_parent,
+ struct cachefiles_object, active_node);
+
+ ASSERT(xobject != object);
+
+ if (xobject->dentry > dentry)
+ _p = &(*_p)->rb_left;
+ else if (xobject->dentry < dentry)
+ _p = &(*_p)->rb_right;
+ else
+ goto wait_for_old_object;
+ }
+
+ rb_link_node(&object->active_node, _parent, _p);
+ rb_insert_color(&object->active_node, &cache->active_nodes);
+
+ write_unlock(&cache->active_lock);
+ _leave(" = 0");
+ return 0;
+
+ /* an old object from a previous incarnation is hogging the slot - we
+ * need to wait for it to be destroyed */
+wait_for_old_object:
+ trace_cachefiles_wait_active(object, dentry, xobject);
+ clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
+
+ if (fscache_object_is_live(&xobject->fscache)) {
+ pr_err("\n");
+ pr_err("Error: Unexpected object collision\n");
+ cachefiles_printk_object(object, xobject);
+ }
+ atomic_inc(&xobject->usage);
+ write_unlock(&cache->active_lock);
+
+ if (test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags)) {
+ wait_queue_head_t *wq;
+
+ signed long timeout = 60 * HZ;
+ wait_queue_entry_t wait;
+ bool requeue;
+
+ /* if the object we're waiting for is queued for processing,
+ * then just put ourselves on the queue behind it */
+ if (work_pending(&xobject->fscache.work)) {
+ _debug("queue OBJ%x behind OBJ%x immediately",
+ object->fscache.debug_id,
+ xobject->fscache.debug_id);
+ goto requeue;
+ }
+
+ /* otherwise we sleep until either the object we're waiting for
+ * is done, or the fscache_object is congested */
+ wq = bit_waitqueue(&xobject->flags, CACHEFILES_OBJECT_ACTIVE);
+ init_wait(&wait);
+ requeue = false;
+ do {
+ prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
+ if (!test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags))
+ break;
+
+ requeue = fscache_object_sleep_till_congested(&timeout);
+ } while (timeout > 0 && !requeue);
+ finish_wait(wq, &wait);
+
+ if (requeue &&
+ test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags)) {
+ _debug("queue OBJ%x behind OBJ%x after wait",
+ object->fscache.debug_id,
+ xobject->fscache.debug_id);
+ goto requeue;
+ }
+
+ if (timeout <= 0) {
+ pr_err("\n");
+ pr_err("Error: Overlong wait for old active object to go away\n");
+ cachefiles_printk_object(object, xobject);
+ goto requeue;
+ }
+ }
+
+ ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &xobject->flags));
+
+ cache->cache.ops->put_object(&xobject->fscache,
+ (enum fscache_obj_ref_trace)cachefiles_obj_put_wait_retry);
+ goto try_again;
+
+requeue:
+ cache->cache.ops->put_object(&xobject->fscache,
+ (enum fscache_obj_ref_trace)cachefiles_obj_put_wait_timeo);
+ _leave(" = -ETIMEDOUT");
+ return -ETIMEDOUT;
+}
+
+/*
+ * Mark an object as being inactive.
+ */
+void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
+ struct cachefiles_object *object,
+ blkcnt_t i_blocks)
+{
+ struct dentry *dentry = object->dentry;
+ struct inode *inode = d_backing_inode(dentry);
+
+ trace_cachefiles_mark_inactive(object, dentry, inode);
+
+ write_lock(&cache->active_lock);
+ rb_erase(&object->active_node, &cache->active_nodes);
+ clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
+ write_unlock(&cache->active_lock);
+
+ wake_up_bit(&object->flags, CACHEFILES_OBJECT_ACTIVE);
+
+ /* This object can now be culled, so we need to let the daemon know
+ * that there is something it can remove if it needs to.
+ */
+ atomic_long_add(i_blocks, &cache->b_released);
+ if (atomic_inc_return(&cache->f_released))
+ cachefiles_state_changed(cache);
+}
+
+/*
+ * delete an object representation from the cache
+ * - file backed objects are unlinked
+ * - directory backed objects are stuffed into the graveyard for userspace to
+ * delete
+ * - unlocks the directory mutex
+ */
+static int cachefiles_bury_object(struct cachefiles_cache *cache,
+ struct cachefiles_object *object,
+ struct dentry *dir,
+ struct dentry *rep,
+ bool preemptive,
+ enum fscache_why_object_killed why)
+{
+ struct dentry *grave, *trap;
+ struct path path, path_to_graveyard;
+ char nbuffer[8 + 8 + 1];
+ int ret;
+
+ _enter(",'%pd','%pd'", dir, rep);
+
+ /* non-directories can just be unlinked */
+ if (!d_is_dir(rep)) {
+ _debug("unlink stale object");
+
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ ret = security_path_unlink(&path, rep);
+ if (ret < 0) {
+ cachefiles_io_error(cache, "Unlink security error");
+ } else {
+ trace_cachefiles_unlink(object, rep, why);
+ ret = vfs_unlink(&init_user_ns, d_inode(dir), rep,
+ NULL);
+
+ if (preemptive)
+ cachefiles_mark_object_buried(cache, rep, why);
+ }
+
+ inode_unlock(d_inode(dir));
+
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Unlink failed");
+
+ _leave(" = %d", ret);
+ return ret;
+ }
+
+ /* directories have to be moved to the graveyard */
+ _debug("move stale object to graveyard");
+ inode_unlock(d_inode(dir));
+
+try_again:
+ /* first step is to make up a grave dentry in the graveyard */
+ sprintf(nbuffer, "%08x%08x",
+ (uint32_t) ktime_get_real_seconds(),
+ (uint32_t) atomic_inc_return(&cache->gravecounter));
+
+ /* do the multiway lock magic */
+ trap = lock_rename(cache->graveyard, dir);
+
+ /* do some checks before getting the grave dentry */
+ if (rep->d_parent != dir || IS_DEADDIR(d_inode(rep))) {
+ /* the entry was probably culled when we dropped the parent dir
+ * lock */
+ unlock_rename(cache->graveyard, dir);
+ _leave(" = 0 [culled?]");
+ return 0;
+ }
+
+ if (!d_can_lookup(cache->graveyard)) {
+ unlock_rename(cache->graveyard, dir);
+ cachefiles_io_error(cache, "Graveyard no longer a directory");
+ return -EIO;
+ }
+
+ if (trap == rep) {
+ unlock_rename(cache->graveyard, dir);
+ cachefiles_io_error(cache, "May not make directory loop");
+ return -EIO;
+ }
+
+ if (d_mountpoint(rep)) {
+ unlock_rename(cache->graveyard, dir);
+ cachefiles_io_error(cache, "Mountpoint in cache");
+ return -EIO;
+ }
+
+ grave = lookup_one_len(nbuffer, cache->graveyard, strlen(nbuffer));
+ if (IS_ERR(grave)) {
+ unlock_rename(cache->graveyard, dir);
+
+ if (PTR_ERR(grave) == -ENOMEM) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ cachefiles_io_error(cache, "Lookup error %ld",
+ PTR_ERR(grave));
+ return -EIO;
+ }
+
+ if (d_is_positive(grave)) {
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ grave = NULL;
+ cond_resched();
+ goto try_again;
+ }
+
+ if (d_mountpoint(grave)) {
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ cachefiles_io_error(cache, "Mountpoint in graveyard");
+ return -EIO;
+ }
+
+ /* target should not be an ancestor of source */
+ if (trap == grave) {
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ cachefiles_io_error(cache, "May not make directory loop");
+ return -EIO;
+ }
+
+ /* attempt the rename */
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ path_to_graveyard.mnt = cache->mnt;
+ path_to_graveyard.dentry = cache->graveyard;
+ ret = security_path_rename(&path, rep, &path_to_graveyard, grave, 0);
+ if (ret < 0) {
+ cachefiles_io_error(cache, "Rename security error %d", ret);
+ } else {
+ struct renamedata rd = {
+ .old_mnt_userns = &init_user_ns,
+ .old_dir = d_inode(dir),
+ .old_dentry = rep,
+ .new_mnt_userns = &init_user_ns,
+ .new_dir = d_inode(cache->graveyard),
+ .new_dentry = grave,
+ };
+ trace_cachefiles_rename(object, rep, grave, why);
+ ret = vfs_rename(&rd);
+ if (ret != 0 && ret != -ENOMEM)
+ cachefiles_io_error(cache,
+ "Rename failed with error %d", ret);
+
+ if (preemptive)
+ cachefiles_mark_object_buried(cache, rep, why);
+ }
+
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * delete an object representation from the cache
+ */
+int cachefiles_delete_object(struct cachefiles_cache *cache,
+ struct cachefiles_object *object)
+{
+ struct dentry *dir;
+ int ret;
+
+ _enter(",OBJ%x{%pd}", object->fscache.debug_id, object->dentry);
+
+ ASSERT(object->dentry);
+ ASSERT(d_backing_inode(object->dentry));
+ ASSERT(object->dentry->d_parent);
+
+ dir = dget_parent(object->dentry);
+
+ inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
+
+ if (test_bit(FSCACHE_OBJECT_KILLED_BY_CACHE, &object->fscache.flags)) {
+ /* object allocation for the same key preemptively deleted this
+ * object's file so that it could create its own file */
+ _debug("object preemptively buried");
+ inode_unlock(d_inode(dir));
+ ret = 0;
+ } else {
+ /* we need to check that our parent is _still_ our parent - it
+ * may have been renamed */
+ if (dir == object->dentry->d_parent) {
+ ret = cachefiles_bury_object(cache, object, dir,
+ object->dentry, false,
+ FSCACHE_OBJECT_WAS_RETIRED);
+ } else {
+ /* it got moved, presumably by cachefilesd culling it,
+ * so it's no longer in the key path and we can ignore
+ * it */
+ inode_unlock(d_inode(dir));
+ ret = 0;
+ }
+ }
+
+ dput(dir);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * walk from the parent object to the child object through the backing
+ * filesystem, creating directories as we go
+ */
+int cachefiles_walk_to_object(struct cachefiles_object *parent,
+ struct cachefiles_object *object,
+ const char *key,
+ struct cachefiles_xattr *auxdata)
+{
+ struct cachefiles_cache *cache;
+ struct dentry *dir, *next = NULL;
+ struct inode *inode;
+ struct path path;
+ const char *name;
+ int ret, nlen;
+
+ _enter("OBJ%x{%pd},OBJ%x,%s,",
+ parent->fscache.debug_id, parent->dentry,
+ object->fscache.debug_id, key);
+
+ cache = container_of(parent->fscache.cache,
+ struct cachefiles_cache, cache);
+ path.mnt = cache->mnt;
+
+ ASSERT(parent->dentry);
+ ASSERT(d_backing_inode(parent->dentry));
+
+ if (!(d_is_dir(parent->dentry))) {
+ // TODO: convert file to dir
+ _leave("looking up in none directory");
+ return -ENOBUFS;
+ }
+
+ dir = dget(parent->dentry);
+
+advance:
+ /* attempt to transit the first directory component */
+ name = key;
+ nlen = strlen(key);
+
+ /* key ends in a double NUL */
+ key = key + nlen + 1;
+ if (!*key)
+ key = NULL;
+
+lookup_again:
+ /* search the current directory for the element name */
+ _debug("lookup '%s'", name);
+
+ inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
+
+ next = lookup_one_len(name, dir, nlen);
+ if (IS_ERR(next)) {
+ trace_cachefiles_lookup(object, next, NULL);
+ goto lookup_error;
+ }
+
+ inode = d_backing_inode(next);
+ trace_cachefiles_lookup(object, next, inode);
+ _debug("next -> %pd %s", next, inode ? "positive" : "negative");
+
+ if (!key)
+ object->new = !inode;
+
+ /* if this element of the path doesn't exist, then the lookup phase
+ * failed, and we can release any readers in the certain knowledge that
+ * there's nothing for them to actually read */
+ if (d_is_negative(next))
+ fscache_object_lookup_negative(&object->fscache);
+
+ /* we need to create the object if it's negative */
+ if (key || object->type == FSCACHE_COOKIE_TYPE_INDEX) {
+ /* index objects and intervening tree levels must be subdirs */
+ if (d_is_negative(next)) {
+ ret = cachefiles_has_space(cache, 1, 0);
+ if (ret < 0)
+ goto no_space_error;
+
+ path.dentry = dir;
+ ret = security_path_mkdir(&path, next, 0);
+ if (ret < 0)
+ goto create_error;
+ ret = vfs_mkdir(&init_user_ns, d_inode(dir), next, 0);
+ if (!key)
+ trace_cachefiles_mkdir(object, next, ret);
+ if (ret < 0)
+ goto create_error;
+
+ if (unlikely(d_unhashed(next))) {
+ dput(next);
+ inode_unlock(d_inode(dir));
+ goto lookup_again;
+ }
+ ASSERT(d_backing_inode(next));
+
+ _debug("mkdir -> %pd{ino=%lu}",
+ next, d_backing_inode(next)->i_ino);
+
+ } else if (!d_can_lookup(next)) {
+ pr_err("inode %lu is not a directory\n",
+ d_backing_inode(next)->i_ino);
+ ret = -ENOBUFS;
+ goto error;
+ }
+
+ } else {
+ /* non-index objects start out life as files */
+ if (d_is_negative(next)) {
+ ret = cachefiles_has_space(cache, 1, 0);
+ if (ret < 0)
+ goto no_space_error;
+
+ path.dentry = dir;
+ ret = security_path_mknod(&path, next, S_IFREG, 0);
+ if (ret < 0)
+ goto create_error;
+ ret = vfs_create(&init_user_ns, d_inode(dir), next,
+ S_IFREG, true);
+ trace_cachefiles_create(object, next, ret);
+ if (ret < 0)
+ goto create_error;
+
+ ASSERT(d_backing_inode(next));
+
+ _debug("create -> %pd{ino=%lu}",
+ next, d_backing_inode(next)->i_ino);
+
+ } else if (!d_can_lookup(next) &&
+ !d_is_reg(next)
+ ) {
+ pr_err("inode %lu is not a file or directory\n",
+ d_backing_inode(next)->i_ino);
+ ret = -ENOBUFS;
+ goto error;
+ }
+ }
+
+ /* process the next component */
+ if (key) {
+ _debug("advance");
+ inode_unlock(d_inode(dir));
+ dput(dir);
+ dir = next;
+ next = NULL;
+ goto advance;
+ }
+
+ /* we've found the object we were looking for */
+ object->dentry = next;
+
+ /* if we've found that the terminal object exists, then we need to
+ * check its attributes and delete it if it's out of date */
+ if (!object->new) {
+ _debug("validate '%pd'", next);
+
+ ret = cachefiles_check_object_xattr(object, auxdata);
+ if (ret == -ESTALE) {
+ /* delete the object (the deleter drops the directory
+ * mutex) */
+ object->dentry = NULL;
+
+ ret = cachefiles_bury_object(cache, object, dir, next,
+ true,
+ FSCACHE_OBJECT_IS_STALE);
+ dput(next);
+ next = NULL;
+
+ if (ret < 0)
+ goto delete_error;
+
+ _debug("redo lookup");
+ fscache_object_retrying_stale(&object->fscache);
+ goto lookup_again;
+ }
+ }
+
+ /* note that we're now using this object */
+ ret = cachefiles_mark_object_active(cache, object);
+
+ inode_unlock(d_inode(dir));
+ dput(dir);
+ dir = NULL;
+
+ if (ret == -ETIMEDOUT)
+ goto mark_active_timed_out;
+
+ _debug("=== OBTAINED_OBJECT ===");
+
+ if (object->new) {
+ /* attach data to a newly constructed terminal object */
+ ret = cachefiles_set_object_xattr(object, auxdata);
+ if (ret < 0)
+ goto check_error;
+ } else {
+ /* always update the atime on an object we've just looked up
+ * (this is used to keep track of culling, and atimes are only
+ * updated by read, write and readdir but not lookup or
+ * open) */
+ path.dentry = next;
+ touch_atime(&path);
+ }
+
+ /* open a file interface onto a data file */
+ if (object->type != FSCACHE_COOKIE_TYPE_INDEX) {
+ if (d_is_reg(object->dentry)) {
+ const struct address_space_operations *aops;
+
+ ret = -EPERM;
+ aops = d_backing_inode(object->dentry)->i_mapping->a_ops;
+ if (!aops->bmap)
+ goto check_error;
+ if (object->dentry->d_sb->s_blocksize > PAGE_SIZE)
+ goto check_error;
+
+ object->backer = object->dentry;
+ } else {
+ BUG(); // TODO: open file in data-class subdir
+ }
+ }
+
+ object->new = 0;
+ fscache_obtained_object(&object->fscache);
+
+ _leave(" = 0 [%lu]", d_backing_inode(object->dentry)->i_ino);
+ return 0;
+
+no_space_error:
+ fscache_object_mark_killed(&object->fscache, FSCACHE_OBJECT_NO_SPACE);
+create_error:
+ _debug("create error %d", ret);
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Create/mkdir failed");
+ goto error;
+
+mark_active_timed_out:
+ _debug("mark active timed out");
+ goto release_dentry;
+
+check_error:
+ _debug("check error %d", ret);
+ cachefiles_mark_object_inactive(
+ cache, object, d_backing_inode(object->dentry)->i_blocks);
+release_dentry:
+ dput(object->dentry);
+ object->dentry = NULL;
+ goto error_out;
+
+delete_error:
+ _debug("delete error %d", ret);
+ goto error_out2;
+
+lookup_error:
+ _debug("lookup error %ld", PTR_ERR(next));
+ ret = PTR_ERR(next);
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Lookup failed");
+ next = NULL;
+error:
+ inode_unlock(d_inode(dir));
+ dput(next);
+error_out2:
+ dput(dir);
+error_out:
+ _leave(" = error %d", -ret);
+ return ret;
+}
+
+/*
+ * get a subdirectory
+ */
+struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
+ struct dentry *dir,
+ const char *dirname)
+{
+ struct dentry *subdir;
+ struct path path;
+ int ret;
+
+ _enter(",,%s", dirname);
+
+ /* search the current directory for the element name */
+ inode_lock(d_inode(dir));
+
+retry:
+ subdir = lookup_one_len(dirname, dir, strlen(dirname));
+ if (IS_ERR(subdir)) {
+ if (PTR_ERR(subdir) == -ENOMEM)
+ goto nomem_d_alloc;
+ goto lookup_error;
+ }
+
+ _debug("subdir -> %pd %s",
+ subdir, d_backing_inode(subdir) ? "positive" : "negative");
+
+ /* we need to create the subdir if it doesn't exist yet */
+ if (d_is_negative(subdir)) {
+ ret = cachefiles_has_space(cache, 1, 0);
+ if (ret < 0)
+ goto mkdir_error;
+
+ _debug("attempt mkdir");
+
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ ret = security_path_mkdir(&path, subdir, 0700);
+ if (ret < 0)
+ goto mkdir_error;
+ ret = vfs_mkdir(&init_user_ns, d_inode(dir), subdir, 0700);
+ if (ret < 0)
+ goto mkdir_error;
+
+ if (unlikely(d_unhashed(subdir))) {
+ dput(subdir);
+ goto retry;
+ }
+ ASSERT(d_backing_inode(subdir));
+
+ _debug("mkdir -> %pd{ino=%lu}",
+ subdir, d_backing_inode(subdir)->i_ino);
+ }
+
+ inode_unlock(d_inode(dir));
+
+ /* we need to make sure the subdir is a directory */
+ ASSERT(d_backing_inode(subdir));
+
+ if (!d_can_lookup(subdir)) {
+ pr_err("%s is not a directory\n", dirname);
+ ret = -EIO;
+ goto check_error;
+ }
+
+ ret = -EPERM;
+ if (!(d_backing_inode(subdir)->i_opflags & IOP_XATTR) ||
+ !d_backing_inode(subdir)->i_op->lookup ||
+ !d_backing_inode(subdir)->i_op->mkdir ||
+ !d_backing_inode(subdir)->i_op->create ||
+ !d_backing_inode(subdir)->i_op->rename ||
+ !d_backing_inode(subdir)->i_op->rmdir ||
+ !d_backing_inode(subdir)->i_op->unlink)
+ goto check_error;
+
+ _leave(" = [%lu]", d_backing_inode(subdir)->i_ino);
+ return subdir;
+
+check_error:
+ dput(subdir);
+ _leave(" = %d [check]", ret);
+ return ERR_PTR(ret);
+
+mkdir_error:
+ inode_unlock(d_inode(dir));
+ dput(subdir);
+ pr_err("mkdir %s failed with error %d\n", dirname, ret);
+ return ERR_PTR(ret);
+
+lookup_error:
+ inode_unlock(d_inode(dir));
+ ret = PTR_ERR(subdir);
+ pr_err("Lookup %s failed with error %d\n", dirname, ret);
+ return ERR_PTR(ret);
+
+nomem_d_alloc:
+ inode_unlock(d_inode(dir));
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * find out if an object is in use or not
+ * - if finds object and it's not in use:
+ * - returns a pointer to the object and a reference on it
+ * - returns with the directory locked
+ */
+static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
+ struct dentry *dir,
+ char *filename)
+{
+ struct cachefiles_object *object;
+ struct rb_node *_n;
+ struct dentry *victim;
+ int ret;
+
+ //_enter(",%pd/,%s",
+ // dir, filename);
+
+ /* look up the victim */
+ inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
+
+ victim = lookup_one_len(filename, dir, strlen(filename));
+ if (IS_ERR(victim))
+ goto lookup_error;
+
+ //_debug("victim -> %pd %s",
+ // victim, d_backing_inode(victim) ? "positive" : "negative");
+
+ /* if the object is no longer there then we probably retired the object
+ * at the netfs's request whilst the cull was in progress
+ */
+ if (d_is_negative(victim)) {
+ inode_unlock(d_inode(dir));
+ dput(victim);
+ _leave(" = -ENOENT [absent]");
+ return ERR_PTR(-ENOENT);
+ }
+
+ /* check to see if we're using this object */
+ read_lock(&cache->active_lock);
+
+ _n = cache->active_nodes.rb_node;
+
+ while (_n) {
+ object = rb_entry(_n, struct cachefiles_object, active_node);
+
+ if (object->dentry > victim)
+ _n = _n->rb_left;
+ else if (object->dentry < victim)
+ _n = _n->rb_right;
+ else
+ goto object_in_use;
+ }
+
+ read_unlock(&cache->active_lock);
+
+ //_leave(" = %pd", victim);
+ return victim;
+
+object_in_use:
+ read_unlock(&cache->active_lock);
+ inode_unlock(d_inode(dir));
+ dput(victim);
+ //_leave(" = -EBUSY [in use]");
+ return ERR_PTR(-EBUSY);
+
+lookup_error:
+ inode_unlock(d_inode(dir));
+ ret = PTR_ERR(victim);
+ if (ret == -ENOENT) {
+ /* file or dir now absent - probably retired by netfs */
+ _leave(" = -ESTALE [absent]");
+ return ERR_PTR(-ESTALE);
+ }
+
+ if (ret == -EIO) {
+ cachefiles_io_error(cache, "Lookup failed");
+ } else if (ret != -ENOMEM) {
+ pr_err("Internal error: %d\n", ret);
+ ret = -EIO;
+ }
+
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+}
+
+/*
+ * cull an object if it's not in use
+ * - called only by cache manager daemon
+ */
+int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
+ char *filename)
+{
+ struct dentry *victim;
+ int ret;
+
+ _enter(",%pd/,%s", dir, filename);
+
+ victim = cachefiles_check_active(cache, dir, filename);
+ if (IS_ERR(victim))
+ return PTR_ERR(victim);
+
+ _debug("victim -> %pd %s",
+ victim, d_backing_inode(victim) ? "positive" : "negative");
+
+ /* okay... the victim is not being used so we can cull it
+ * - start by marking it as stale
+ */
+ _debug("victim is cullable");
+
+ ret = cachefiles_remove_object_xattr(cache, victim);
+ if (ret < 0)
+ goto error_unlock;
+
+ /* actually remove the victim (drops the dir mutex) */
+ _debug("bury");
+
+ ret = cachefiles_bury_object(cache, NULL, dir, victim, false,
+ FSCACHE_OBJECT_WAS_CULLED);
+ if (ret < 0)
+ goto error;
+
+ dput(victim);
+ _leave(" = 0");
+ return 0;
+
+error_unlock:
+ inode_unlock(d_inode(dir));
+error:
+ dput(victim);
+ if (ret == -ENOENT) {
+ /* file or dir now absent - probably retired by netfs */
+ _leave(" = -ESTALE [absent]");
+ return -ESTALE;
+ }
+
+ if (ret != -ENOMEM) {
+ pr_err("Internal error: %d\n", ret);
+ ret = -EIO;
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * find out if an object is in use or not
+ * - called only by cache manager daemon
+ * - returns -EBUSY or 0 to indicate whether an object is in use or not
+ */
+int cachefiles_check_in_use(struct cachefiles_cache *cache, struct dentry *dir,
+ char *filename)
+{
+ struct dentry *victim;
+
+ //_enter(",%pd/,%s",
+ // dir, filename);
+
+ victim = cachefiles_check_active(cache, dir, filename);
+ if (IS_ERR(victim))
+ return PTR_ERR(victim);
+
+ inode_unlock(d_inode(dir));
+ dput(victim);
+ //_leave(" = 0");
+ return 0;
+}
diff --git a/fs/cachefiles_old/security.c b/fs/cachefiles_old/security.c
new file mode 100644
index 000000000000..aec13fd94692
--- /dev/null
+++ b/fs/cachefiles_old/security.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* CacheFiles security management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/fs.h>
+#include <linux/cred.h>
+#include "internal.h"
+
+/*
+ * determine the security context within which we access the cache from within
+ * the kernel
+ */
+int cachefiles_get_security_ID(struct cachefiles_cache *cache)
+{
+ struct cred *new;
+ int ret;
+
+ _enter("{%s}", cache->secctx);
+
+ new = prepare_kernel_cred(current);
+ if (!new) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ if (cache->secctx) {
+ ret = set_security_override_from_ctx(new, cache->secctx);
+ if (ret < 0) {
+ put_cred(new);
+ pr_err("Security denies permission to nominate security context: error %d\n",
+ ret);
+ goto error;
+ }
+ }
+
+ cache->cache_cred = new;
+ ret = 0;
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * see if mkdir and create can be performed in the root directory
+ */
+static int cachefiles_check_cache_dir(struct cachefiles_cache *cache,
+ struct dentry *root)
+{
+ int ret;
+
+ ret = security_inode_mkdir(d_backing_inode(root), root, 0);
+ if (ret < 0) {
+ pr_err("Security denies permission to make dirs: error %d",
+ ret);
+ return ret;
+ }
+
+ ret = security_inode_create(d_backing_inode(root), root, 0);
+ if (ret < 0)
+ pr_err("Security denies permission to create files: error %d",
+ ret);
+
+ return ret;
+}
+
+/*
+ * check the security details of the on-disk cache
+ * - must be called with security override in force
+ * - must return with a security override in force - even in the case of an
+ * error
+ */
+int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
+ struct dentry *root,
+ const struct cred **_saved_cred)
+{
+ struct cred *new;
+ int ret;
+
+ _enter("");
+
+ /* duplicate the cache creds for COW (the override is currently in
+ * force, so we can use prepare_creds() to do this) */
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ cachefiles_end_secure(cache, *_saved_cred);
+
+ /* use the cache root dir's security context as the basis with
+ * which create files */
+ ret = set_create_files_as(new, d_backing_inode(root));
+ if (ret < 0) {
+ abort_creds(new);
+ cachefiles_begin_secure(cache, _saved_cred);
+ _leave(" = %d [cfa]", ret);
+ return ret;
+ }
+
+ put_cred(cache->cache_cred);
+ cache->cache_cred = new;
+
+ cachefiles_begin_secure(cache, _saved_cred);
+ ret = cachefiles_check_cache_dir(cache, root);
+
+ if (ret == -EOPNOTSUPP)
+ ret = 0;
+ _leave(" = %d", ret);
+ return ret;
+}
diff --git a/fs/cachefiles_old/xattr.c b/fs/cachefiles_old/xattr.c
new file mode 100644
index 000000000000..9e82de668595
--- /dev/null
+++ b/fs/cachefiles_old/xattr.c
@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* CacheFiles extended attribute management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/fsnotify.h>
+#include <linux/quotaops.h>
+#include <linux/xattr.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+static const char cachefiles_xattr_cache[] =
+ XATTR_USER_PREFIX "CacheFiles.cache";
+
+/*
+ * check the type label on an object
+ * - done using xattrs
+ */
+int cachefiles_check_object_type(struct cachefiles_object *object)
+{
+ struct dentry *dentry = object->dentry;
+ char type[3], xtype[3];
+ int ret;
+
+ ASSERT(dentry);
+ ASSERT(d_backing_inode(dentry));
+
+ if (!object->fscache.cookie)
+ strcpy(type, "C3");
+ else
+ snprintf(type, 3, "%02x", object->fscache.cookie->def->type);
+
+ _enter("%x{%s}", object->fscache.debug_id, type);
+
+ /* attempt to install a type label directly */
+ ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache, type,
+ 2, XATTR_CREATE);
+ if (ret == 0) {
+ _debug("SET"); /* we succeeded */
+ goto error;
+ }
+
+ if (ret != -EEXIST) {
+ pr_err("Can't set xattr on %pd [%lu] (err %d)\n",
+ dentry, d_backing_inode(dentry)->i_ino,
+ -ret);
+ goto error;
+ }
+
+ /* read the current type label */
+ ret = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache, xtype,
+ 3);
+ if (ret < 0) {
+ if (ret == -ERANGE)
+ goto bad_type_length;
+
+ pr_err("Can't read xattr on %pd [%lu] (err %d)\n",
+ dentry, d_backing_inode(dentry)->i_ino,
+ -ret);
+ goto error;
+ }
+
+ /* check the type is what we're expecting */
+ if (ret != 2)
+ goto bad_type_length;
+
+ if (xtype[0] != type[0] || xtype[1] != type[1])
+ goto bad_type;
+
+ ret = 0;
+
+error:
+ _leave(" = %d", ret);
+ return ret;
+
+bad_type_length:
+ pr_err("Cache object %lu type xattr length incorrect\n",
+ d_backing_inode(dentry)->i_ino);
+ ret = -EIO;
+ goto error;
+
+bad_type:
+ xtype[2] = 0;
+ pr_err("Cache object %pd [%lu] type %s not %s\n",
+ dentry, d_backing_inode(dentry)->i_ino,
+ xtype, type);
+ ret = -EIO;
+ goto error;
+}
+
+/*
+ * set the state xattr on a cache file
+ */
+int cachefiles_set_object_xattr(struct cachefiles_object *object,
+ struct cachefiles_xattr *auxdata)
+{
+ struct dentry *dentry = object->dentry;
+ int ret;
+
+ ASSERT(dentry);
+
+ _enter("%p,#%d", object, auxdata->len);
+
+ /* attempt to install the cache metadata directly */
+ _debug("SET #%u", auxdata->len);
+
+ clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
+ ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
+ &auxdata->type, auxdata->len, XATTR_CREATE);
+ if (ret < 0 && ret != -ENOMEM)
+ cachefiles_io_error_obj(
+ object,
+ "Failed to set xattr with error %d", ret);
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * update the state xattr on a cache file
+ */
+int cachefiles_update_object_xattr(struct cachefiles_object *object,
+ struct cachefiles_xattr *auxdata)
+{
+ struct dentry *dentry = object->dentry;
+ int ret;
+
+ if (!dentry)
+ return -ESTALE;
+
+ _enter("%x,#%d", object->fscache.debug_id, auxdata->len);
+
+ /* attempt to install the cache metadata directly */
+ _debug("SET #%u", auxdata->len);
+
+ clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
+ ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
+ &auxdata->type, auxdata->len, XATTR_REPLACE);
+ if (ret < 0 && ret != -ENOMEM)
+ cachefiles_io_error_obj(
+ object,
+ "Failed to update xattr with error %d", ret);
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * check the consistency between the backing cache and the FS-Cache cookie
+ */
+int cachefiles_check_auxdata(struct cachefiles_object *object)
+{
+ struct cachefiles_xattr *auxbuf;
+ enum fscache_checkaux validity;
+ struct dentry *dentry = object->dentry;
+ ssize_t xlen;
+ int ret;
+
+ ASSERT(dentry);
+ ASSERT(d_backing_inode(dentry));
+ ASSERT(object->fscache.cookie->def->check_aux);
+
+ auxbuf = kmalloc(sizeof(struct cachefiles_xattr) + 512, GFP_KERNEL);
+ if (!auxbuf)
+ return -ENOMEM;
+
+ xlen = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
+ &auxbuf->type, 512 + 1);
+ ret = -ESTALE;
+ if (xlen < 1 ||
+ auxbuf->type != object->fscache.cookie->def->type)
+ goto error;
+
+ xlen--;
+ validity = fscache_check_aux(&object->fscache, &auxbuf->data, xlen,
+ i_size_read(d_backing_inode(dentry)));
+ if (validity != FSCACHE_CHECKAUX_OKAY)
+ goto error;
+
+ ret = 0;
+error:
+ kfree(auxbuf);
+ return ret;
+}
+
+/*
+ * check the state xattr on a cache file
+ * - return -ESTALE if the object should be deleted
+ */
+int cachefiles_check_object_xattr(struct cachefiles_object *object,
+ struct cachefiles_xattr *auxdata)
+{
+ struct cachefiles_xattr *auxbuf;
+ struct dentry *dentry = object->dentry;
+ int ret;
+
+ _enter("%p,#%d", object, auxdata->len);
+
+ ASSERT(dentry);
+ ASSERT(d_backing_inode(dentry));
+
+ auxbuf = kmalloc(sizeof(struct cachefiles_xattr) + 512, cachefiles_gfp);
+ if (!auxbuf) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ /* read the current type label */
+ ret = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
+ &auxbuf->type, 512 + 1);
+ if (ret < 0) {
+ if (ret == -ENODATA)
+ goto stale; /* no attribute - power went off
+ * mid-cull? */
+
+ if (ret == -ERANGE)
+ goto bad_type_length;
+
+ cachefiles_io_error_obj(object,
+ "Can't read xattr on %lu (err %d)",
+ d_backing_inode(dentry)->i_ino, -ret);
+ goto error;
+ }
+
+ /* check the on-disk object */
+ if (ret < 1)
+ goto bad_type_length;
+
+ if (auxbuf->type != auxdata->type)
+ goto stale;
+
+ auxbuf->len = ret;
+
+ /* consult the netfs */
+ if (object->fscache.cookie->def->check_aux) {
+ enum fscache_checkaux result;
+ unsigned int dlen;
+
+ dlen = auxbuf->len - 1;
+
+ _debug("checkaux %s #%u",
+ object->fscache.cookie->def->name, dlen);
+
+ result = fscache_check_aux(&object->fscache,
+ &auxbuf->data, dlen,
+ i_size_read(d_backing_inode(dentry)));
+
+ switch (result) {
+ /* entry okay as is */
+ case FSCACHE_CHECKAUX_OKAY:
+ goto okay;
+
+ /* entry requires update */
+ case FSCACHE_CHECKAUX_NEEDS_UPDATE:
+ break;
+
+ /* entry requires deletion */
+ case FSCACHE_CHECKAUX_OBSOLETE:
+ goto stale;
+
+ default:
+ BUG();
+ }
+
+ /* update the current label */
+ ret = vfs_setxattr(&init_user_ns, dentry,
+ cachefiles_xattr_cache, &auxdata->type,
+ auxdata->len, XATTR_REPLACE);
+ if (ret < 0) {
+ cachefiles_io_error_obj(object,
+ "Can't update xattr on %lu"
+ " (error %d)",
+ d_backing_inode(dentry)->i_ino, -ret);
+ goto error;
+ }
+ }
+
+okay:
+ ret = 0;
+
+error:
+ kfree(auxbuf);
+ _leave(" = %d", ret);
+ return ret;
+
+bad_type_length:
+ pr_err("Cache object %lu xattr length incorrect\n",
+ d_backing_inode(dentry)->i_ino);
+ ret = -EIO;
+ goto error;
+
+stale:
+ ret = -ESTALE;
+ goto error;
+}
+
+/*
+ * remove the object's xattr to mark it stale
+ */
+int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
+ struct dentry *dentry)
+{
+ int ret;
+
+ ret = vfs_removexattr(&init_user_ns, dentry, cachefiles_xattr_cache);
+ if (ret < 0) {
+ if (ret == -ENOENT || ret == -ENODATA)
+ ret = 0;
+ else if (ret != -ENOMEM)
+ cachefiles_io_error(cache,
+ "Can't remove xattr from %lu"
+ " (error %d)",
+ d_backing_inode(dentry)->i_ino, -ret);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h
deleted file mode 100644
index 920b6a303d60..000000000000
--- a/include/trace/events/cachefiles.h
+++ /dev/null
@@ -1,321 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* CacheFiles tracepoints
- *
- * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM cachefiles
-
-#if !defined(_TRACE_CACHEFILES_H) || defined(TRACE_HEADER_MULTI_READ)
-#define _TRACE_CACHEFILES_H
-
-#include <linux/tracepoint.h>
-
-/*
- * Define enums for tracing information.
- */
-#ifndef __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
-#define __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
-
-enum cachefiles_obj_ref_trace {
- cachefiles_obj_put_wait_retry = fscache_obj_ref__nr_traces,
- cachefiles_obj_put_wait_timeo,
- cachefiles_obj_ref__nr_traces
-};
-
-#endif
-
-/*
- * Define enum -> string mappings for display.
- */
-#define cachefiles_obj_kill_traces \
- EM(FSCACHE_OBJECT_IS_STALE, "stale") \
- EM(FSCACHE_OBJECT_NO_SPACE, "no_space") \
- EM(FSCACHE_OBJECT_WAS_RETIRED, "was_retired") \
- E_(FSCACHE_OBJECT_WAS_CULLED, "was_culled")
-
-#define cachefiles_obj_ref_traces \
- EM(fscache_obj_get_add_to_deps, "GET add_to_deps") \
- EM(fscache_obj_get_queue, "GET queue") \
- EM(fscache_obj_put_alloc_fail, "PUT alloc_fail") \
- EM(fscache_obj_put_attach_fail, "PUT attach_fail") \
- EM(fscache_obj_put_drop_obj, "PUT drop_obj") \
- EM(fscache_obj_put_enq_dep, "PUT enq_dep") \
- EM(fscache_obj_put_queue, "PUT queue") \
- EM(fscache_obj_put_work, "PUT work") \
- EM(cachefiles_obj_put_wait_retry, "PUT wait_retry") \
- E_(cachefiles_obj_put_wait_timeo, "PUT wait_timeo")
-
-/*
- * Export enum symbols via userspace.
- */
-#undef EM
-#undef E_
-#define EM(a, b) TRACE_DEFINE_ENUM(a);
-#define E_(a, b) TRACE_DEFINE_ENUM(a);
-
-cachefiles_obj_kill_traces;
-cachefiles_obj_ref_traces;
-
-/*
- * Now redefine the EM() and E_() macros to map the enums to the strings that
- * will be printed in the output.
- */
-#undef EM
-#undef E_
-#define EM(a, b) { a, b },
-#define E_(a, b) { a, b }
-
-
-TRACE_EVENT(cachefiles_ref,
- TP_PROTO(struct cachefiles_object *obj,
- struct fscache_cookie *cookie,
- enum cachefiles_obj_ref_trace why,
- int usage),
-
- TP_ARGS(obj, cookie, why, usage),
-
- /* Note that obj may be NULL */
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(unsigned int, cookie )
- __field(enum cachefiles_obj_ref_trace, why )
- __field(int, usage )
- ),
-
- TP_fast_assign(
- __entry->obj = obj->fscache.debug_id;
- __entry->cookie = cookie->debug_id;
- __entry->usage = usage;
- __entry->why = why;
- ),
-
- TP_printk("c=%08x o=%08x u=%d %s",
- __entry->cookie, __entry->obj, __entry->usage,
- __print_symbolic(__entry->why, cachefiles_obj_ref_traces))
- );
-
-TRACE_EVENT(cachefiles_lookup,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de,
- struct inode *inode),
-
- TP_ARGS(obj, de, inode),
-
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- __field(struct inode *, inode )
- ),
-
- TP_fast_assign(
- __entry->obj = obj->fscache.debug_id;
- __entry->de = de;
- __entry->inode = inode;
- ),
-
- TP_printk("o=%08x d=%p i=%p",
- __entry->obj, __entry->de, __entry->inode)
- );
-
-TRACE_EVENT(cachefiles_mkdir,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de, int ret),
-
- TP_ARGS(obj, de, ret),
-
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- __field(int, ret )
- ),
-
- TP_fast_assign(
- __entry->obj = obj->fscache.debug_id;
- __entry->de = de;
- __entry->ret = ret;
- ),
-
- TP_printk("o=%08x d=%p r=%u",
- __entry->obj, __entry->de, __entry->ret)
- );
-
-TRACE_EVENT(cachefiles_create,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de, int ret),
-
- TP_ARGS(obj, de, ret),
-
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- __field(int, ret )
- ),
-
- TP_fast_assign(
- __entry->obj = obj->fscache.debug_id;
- __entry->de = de;
- __entry->ret = ret;
- ),
-
- TP_printk("o=%08x d=%p r=%u",
- __entry->obj, __entry->de, __entry->ret)
- );
-
-TRACE_EVENT(cachefiles_unlink,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de,
- enum fscache_why_object_killed why),
-
- TP_ARGS(obj, de, why),
-
- /* Note that obj may be NULL */
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- __field(enum fscache_why_object_killed, why )
- ),
-
- TP_fast_assign(
- __entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
- __entry->de = de;
- __entry->why = why;
- ),
-
- TP_printk("o=%08x d=%p w=%s",
- __entry->obj, __entry->de,
- __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
- );
-
-TRACE_EVENT(cachefiles_rename,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de,
- struct dentry *to,
- enum fscache_why_object_killed why),
-
- TP_ARGS(obj, de, to, why),
-
- /* Note that obj may be NULL */
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- __field(struct dentry *, to )
- __field(enum fscache_why_object_killed, why )
- ),
-
- TP_fast_assign(
- __entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
- __entry->de = de;
- __entry->to = to;
- __entry->why = why;
- ),
-
- TP_printk("o=%08x d=%p t=%p w=%s",
- __entry->obj, __entry->de, __entry->to,
- __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
- );
-
-TRACE_EVENT(cachefiles_mark_active,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de),
-
- TP_ARGS(obj, de),
-
- /* Note that obj may be NULL */
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- ),
-
- TP_fast_assign(
- __entry->obj = obj->fscache.debug_id;
- __entry->de = de;
- ),
-
- TP_printk("o=%08x d=%p",
- __entry->obj, __entry->de)
- );
-
-TRACE_EVENT(cachefiles_wait_active,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de,
- struct cachefiles_object *xobj),
-
- TP_ARGS(obj, de, xobj),
-
- /* Note that obj may be NULL */
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(unsigned int, xobj )
- __field(struct dentry *, de )
- __field(u16, flags )
- __field(u16, fsc_flags )
- ),
-
- TP_fast_assign(
- __entry->obj = obj->fscache.debug_id;
- __entry->de = de;
- __entry->xobj = xobj->fscache.debug_id;
- __entry->flags = xobj->flags;
- __entry->fsc_flags = xobj->fscache.flags;
- ),
-
- TP_printk("o=%08x d=%p wo=%08x wf=%x wff=%x",
- __entry->obj, __entry->de, __entry->xobj,
- __entry->flags, __entry->fsc_flags)
- );
-
-TRACE_EVENT(cachefiles_mark_inactive,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de,
- struct inode *inode),
-
- TP_ARGS(obj, de, inode),
-
- /* Note that obj may be NULL */
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- __field(struct inode *, inode )
- ),
-
- TP_fast_assign(
- __entry->obj = obj->fscache.debug_id;
- __entry->de = de;
- __entry->inode = inode;
- ),
-
- TP_printk("o=%08x d=%p i=%p",
- __entry->obj, __entry->de, __entry->inode)
- );
-
-TRACE_EVENT(cachefiles_mark_buried,
- TP_PROTO(struct cachefiles_object *obj,
- struct dentry *de,
- enum fscache_why_object_killed why),
-
- TP_ARGS(obj, de, why),
-
- /* Note that obj may be NULL */
- TP_STRUCT__entry(
- __field(unsigned int, obj )
- __field(struct dentry *, de )
- __field(enum fscache_why_object_killed, why )
- ),
-
- TP_fast_assign(
- __entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
- __entry->de = de;
- __entry->why = why;
- ),
-
- TP_printk("o=%08x d=%p w=%s",
- __entry->obj, __entry->de,
- __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
- );
-
-#endif /* _TRACE_CACHEFILES_H */
-
-/* This part must be outside protection */
-#include <trace/define_trace.h>
diff --git a/include/trace/events/cachefiles_old.h b/include/trace/events/cachefiles_old.h
new file mode 100644
index 000000000000..bffe2ce6de0e
--- /dev/null
+++ b/include/trace/events/cachefiles_old.h
@@ -0,0 +1,321 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* CacheFiles tracepoints
+ *
+ * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cachefiles_old
+
+#if !defined(_TRACE_CACHEFILES_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CACHEFILES_H
+
+#include <linux/tracepoint.h>
+
+/*
+ * Define enums for tracing information.
+ */
+#ifndef __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
+#define __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
+
+enum cachefiles_obj_ref_trace {
+ cachefiles_obj_put_wait_retry = fscache_obj_ref__nr_traces,
+ cachefiles_obj_put_wait_timeo,
+ cachefiles_obj_ref__nr_traces
+};
+
+#endif
+
+/*
+ * Define enum -> string mappings for display.
+ */
+#define cachefiles_obj_kill_traces \
+ EM(FSCACHE_OBJECT_IS_STALE, "stale") \
+ EM(FSCACHE_OBJECT_NO_SPACE, "no_space") \
+ EM(FSCACHE_OBJECT_WAS_RETIRED, "was_retired") \
+ E_(FSCACHE_OBJECT_WAS_CULLED, "was_culled")
+
+#define cachefiles_obj_ref_traces \
+ EM(fscache_obj_get_add_to_deps, "GET add_to_deps") \
+ EM(fscache_obj_get_queue, "GET queue") \
+ EM(fscache_obj_put_alloc_fail, "PUT alloc_fail") \
+ EM(fscache_obj_put_attach_fail, "PUT attach_fail") \
+ EM(fscache_obj_put_drop_obj, "PUT drop_obj") \
+ EM(fscache_obj_put_enq_dep, "PUT enq_dep") \
+ EM(fscache_obj_put_queue, "PUT queue") \
+ EM(fscache_obj_put_work, "PUT work") \
+ EM(cachefiles_obj_put_wait_retry, "PUT wait_retry") \
+ E_(cachefiles_obj_put_wait_timeo, "PUT wait_timeo")
+
+/*
+ * Export enum symbols via userspace.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) TRACE_DEFINE_ENUM(a);
+#define E_(a, b) TRACE_DEFINE_ENUM(a);
+
+cachefiles_obj_kill_traces;
+cachefiles_obj_ref_traces;
+
+/*
+ * Now redefine the EM() and E_() macros to map the enums to the strings that
+ * will be printed in the output.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) { a, b },
+#define E_(a, b) { a, b }
+
+
+TRACE_EVENT(cachefiles_ref,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct fscache_cookie *cookie,
+ enum cachefiles_obj_ref_trace why,
+ int usage),
+
+ TP_ARGS(obj, cookie, why, usage),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, cookie )
+ __field(enum cachefiles_obj_ref_trace, why )
+ __field(int, usage )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->fscache.debug_id;
+ __entry->cookie = cookie->debug_id;
+ __entry->usage = usage;
+ __entry->why = why;
+ ),
+
+ TP_printk("c=%08x o=%08x u=%d %s",
+ __entry->cookie, __entry->obj, __entry->usage,
+ __print_symbolic(__entry->why, cachefiles_obj_ref_traces))
+ );
+
+TRACE_EVENT(cachefiles_lookup,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ struct inode *inode),
+
+ TP_ARGS(obj, de, inode),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(struct inode *, inode )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->fscache.debug_id;
+ __entry->de = de;
+ __entry->inode = inode;
+ ),
+
+ TP_printk("o=%08x d=%p i=%p",
+ __entry->obj, __entry->de, __entry->inode)
+ );
+
+TRACE_EVENT(cachefiles_mkdir,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de, int ret),
+
+ TP_ARGS(obj, de, ret),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(int, ret )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->fscache.debug_id;
+ __entry->de = de;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("o=%08x d=%p r=%u",
+ __entry->obj, __entry->de, __entry->ret)
+ );
+
+TRACE_EVENT(cachefiles_create,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de, int ret),
+
+ TP_ARGS(obj, de, ret),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(int, ret )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->fscache.debug_id;
+ __entry->de = de;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("o=%08x d=%p r=%u",
+ __entry->obj, __entry->de, __entry->ret)
+ );
+
+TRACE_EVENT(cachefiles_unlink,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ enum fscache_why_object_killed why),
+
+ TP_ARGS(obj, de, why),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(enum fscache_why_object_killed, why )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
+ __entry->de = de;
+ __entry->why = why;
+ ),
+
+ TP_printk("o=%08x d=%p w=%s",
+ __entry->obj, __entry->de,
+ __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
+ );
+
+TRACE_EVENT(cachefiles_rename,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ struct dentry *to,
+ enum fscache_why_object_killed why),
+
+ TP_ARGS(obj, de, to, why),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(struct dentry *, to )
+ __field(enum fscache_why_object_killed, why )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
+ __entry->de = de;
+ __entry->to = to;
+ __entry->why = why;
+ ),
+
+ TP_printk("o=%08x d=%p t=%p w=%s",
+ __entry->obj, __entry->de, __entry->to,
+ __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
+ );
+
+TRACE_EVENT(cachefiles_mark_active,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de),
+
+ TP_ARGS(obj, de),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->fscache.debug_id;
+ __entry->de = de;
+ ),
+
+ TP_printk("o=%08x d=%p",
+ __entry->obj, __entry->de)
+ );
+
+TRACE_EVENT(cachefiles_wait_active,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ struct cachefiles_object *xobj),
+
+ TP_ARGS(obj, de, xobj),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, xobj )
+ __field(struct dentry *, de )
+ __field(u16, flags )
+ __field(u16, fsc_flags )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->fscache.debug_id;
+ __entry->de = de;
+ __entry->xobj = xobj->fscache.debug_id;
+ __entry->flags = xobj->flags;
+ __entry->fsc_flags = xobj->fscache.flags;
+ ),
+
+ TP_printk("o=%08x d=%p wo=%08x wf=%x wff=%x",
+ __entry->obj, __entry->de, __entry->xobj,
+ __entry->flags, __entry->fsc_flags)
+ );
+
+TRACE_EVENT(cachefiles_mark_inactive,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ struct inode *inode),
+
+ TP_ARGS(obj, de, inode),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(struct inode *, inode )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->fscache.debug_id;
+ __entry->de = de;
+ __entry->inode = inode;
+ ),
+
+ TP_printk("o=%08x d=%p i=%p",
+ __entry->obj, __entry->de, __entry->inode)
+ );
+
+TRACE_EVENT(cachefiles_mark_buried,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ enum fscache_why_object_killed why),
+
+ TP_ARGS(obj, de, why),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(enum fscache_why_object_killed, why )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
+ __entry->de = de;
+ __entry->why = why;
+ ),
+
+ TP_printk("o=%08x d=%p w=%s",
+ __entry->obj, __entry->de,
+ __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
+ );
+
+#endif /* _TRACE_CACHEFILES_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 04/53] cachefiles_old: Rename CONFIG_CACHEFILES* to CONFIG_CACHEFILES_OLD*
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (2 preceding siblings ...)
2021-10-22 18:59 ` [PATCH v2 03/53] cachefiles_old: Move the old cachefiles driver to one side David Howells
@ 2021-10-22 18:59 ` David Howells
2021-10-22 18:59 ` [PATCH v2 05/53] netfs: Display the netfs inode number in the netfs_read tracepoint David Howells
` (50 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 18:59 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Rename the CONFIG_CACHEFILES* config symbols to CONFIG_CACHEFILES_OLD*.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/Makefile | 2 +-
fs/cachefiles_old/Kconfig | 8 ++++----
fs/cachefiles_old/Makefile | 2 +-
fs/cachefiles_old/internal.h | 2 +-
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/fs/Makefile b/fs/Makefile
index 6e6dbcd04cae..e5cb91ecb29f 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -125,7 +125,7 @@ obj-$(CONFIG_AFS_FS) += afs/
obj-$(CONFIG_NILFS2_FS) += nilfs2/
obj-$(CONFIG_BEFS_FS) += befs/
obj-$(CONFIG_HOSTFS) += hostfs/
-obj-$(CONFIG_CACHEFILES) += cachefiles_old/
+obj-$(CONFIG_CACHEFILES_OLD) += cachefiles_old/
obj-$(CONFIG_DEBUG_FS) += debugfs/
obj-$(CONFIG_TRACING) += tracefs/
obj-$(CONFIG_OCFS2_FS) += ocfs2/
diff --git a/fs/cachefiles_old/Kconfig b/fs/cachefiles_old/Kconfig
index 7f3e1881fb21..48977018c64e 100644
--- a/fs/cachefiles_old/Kconfig
+++ b/fs/cachefiles_old/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
-config CACHEFILES
- tristate "Filesystem caching on files"
+config CACHEFILES_OLD
+ tristate "Filesystem caching on files (old driver)"
depends on FSCACHE_OLD && BLOCK
help
This permits use of a mounted filesystem as a cache for other
@@ -11,9 +11,9 @@ config CACHEFILES
See Documentation/filesystems/caching/cachefiles.rst for more
information.
-config CACHEFILES_DEBUG
+config CACHEFILES_OLD_DEBUG
bool "Debug CacheFiles"
- depends on CACHEFILES
+ depends on CACHEFILES_OLD
help
This permits debugging to be dynamically enabled in the filesystem
caching on files module. If this is set, the debugging output may be
diff --git a/fs/cachefiles_old/Makefile b/fs/cachefiles_old/Makefile
index 714e84b3ca24..e0c2e69ddf50 100644
--- a/fs/cachefiles_old/Makefile
+++ b/fs/cachefiles_old/Makefile
@@ -14,4 +14,4 @@ cachefiles-y := \
security.o \
xattr.o
-obj-$(CONFIG_CACHEFILES) := cachefiles.o
+obj-$(CONFIG_CACHEFILES_OLD) := cachefiles.o
diff --git a/fs/cachefiles_old/internal.h b/fs/cachefiles_old/internal.h
index 28351d62d8d2..9e3a8d6894db 100644
--- a/fs/cachefiles_old/internal.h
+++ b/fs/cachefiles_old/internal.h
@@ -235,7 +235,7 @@ do { \
#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
-#elif defined(CONFIG_CACHEFILES_DEBUG)
+#elif defined(CONFIG_CACHEFILES_OLD_DEBUG)
#define _enter(FMT, ...) \
do { \
if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 05/53] netfs: Display the netfs inode number in the netfs_read tracepoint
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (3 preceding siblings ...)
2021-10-22 18:59 ` [PATCH v2 04/53] cachefiles_old: Rename CONFIG_CACHEFILES* to CONFIG_CACHEFILES_OLD* David Howells
@ 2021-10-22 18:59 ` David Howells
2021-10-22 19:00 ` [PATCH v2 06/53] netfs: Pass a flag to ->prepare_write() to say if there's no alloc'd space David Howells
` (49 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 18:59 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Display the netfs inode number in the netfs_read tracepoint so that this
can be used to correlate with the cachefiles_prep_read tracepoint.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
include/trace/events/netfs.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index 4d470bffd9f1..e6f4ebbb4c69 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -135,6 +135,7 @@ TRACE_EVENT(netfs_read,
__field(loff_t, start )
__field(size_t, len )
__field(enum netfs_read_trace, what )
+ __field(unsigned int, netfs_inode )
),
TP_fast_assign(
@@ -143,12 +144,14 @@ TRACE_EVENT(netfs_read,
__entry->start = start;
__entry->len = len;
__entry->what = what;
+ __entry->netfs_inode = rreq->inode->i_ino;
),
- TP_printk("R=%08x %s c=%08x s=%llx %zx",
+ TP_printk("R=%08x %s c=%08x ni=%x s=%llx %zx",
__entry->rreq,
__print_symbolic(__entry->what, netfs_read_traces),
__entry->cookie,
+ __entry->netfs_inode,
__entry->start, __entry->len)
);
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 06/53] netfs: Pass a flag to ->prepare_write() to say if there's no alloc'd space
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (4 preceding siblings ...)
2021-10-22 18:59 ` [PATCH v2 05/53] netfs: Display the netfs inode number in the netfs_read tracepoint David Howells
@ 2021-10-22 19:00 ` David Howells
2021-10-22 19:00 ` [PATCH v2 07/53] fscache: Introduce new driver David Howells
` (48 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:00 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Pass a flag to ->prepare_write() to indicate if there's definitely no
space allocated in the cache yet (for instance if we've already checked as
we were asked to do a read).
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles_old/io.c | 3 ++-
fs/netfs/read_helper.c | 2 +-
include/linux/netfs.h | 3 ++-
3 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/cachefiles_old/io.c b/fs/cachefiles_old/io.c
index 5ead97de4bb7..eab8641de994 100644
--- a/fs/cachefiles_old/io.c
+++ b/fs/cachefiles_old/io.c
@@ -341,7 +341,8 @@ static enum netfs_read_source cachefiles_prepare_read(struct netfs_read_subreque
* Prepare for a write to occur.
*/
static int cachefiles_prepare_write(struct netfs_cache_resources *cres,
- loff_t *_start, size_t *_len, loff_t i_size)
+ loff_t *_start, size_t *_len, loff_t i_size,
+ bool no_space_allocated_yet)
{
loff_t start = *_start;
size_t len = *_len, down;
diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index dfc60c79a9f3..80f8e334371d 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -323,7 +323,7 @@ static void netfs_rreq_do_write_to_cache(struct netfs_read_request *rreq)
}
ret = cres->ops->prepare_write(cres, &subreq->start, &subreq->len,
- rreq->i_size);
+ rreq->i_size, true);
if (ret < 0) {
trace_netfs_failure(rreq, subreq, ret, netfs_fail_prepare_write);
trace_netfs_sreq(subreq, netfs_sreq_trace_write_skip);
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 014fb502fd91..99137486d351 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -220,7 +220,8 @@ struct netfs_cache_ops {
* actually do.
*/
int (*prepare_write)(struct netfs_cache_resources *cres,
- loff_t *_start, size_t *_len, loff_t i_size);
+ loff_t *_start, size_t *_len, loff_t i_size,
+ bool no_space_allocated_yet);
/* Prepare a write operation for the fallback fscache API, working out
* whether we can cache a page or not.
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 07/53] fscache: Introduce new driver
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (5 preceding siblings ...)
2021-10-22 19:00 ` [PATCH v2 06/53] netfs: Pass a flag to ->prepare_write() to say if there's no alloc'd space David Howells
@ 2021-10-22 19:00 ` David Howells
2021-10-22 19:01 ` [PATCH v2 08/53] fscache: Implement a hash function David Howells
` (47 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:00 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Introduce basic skeleton of the new, rewritten fscache driver.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/Kconfig | 1
fs/Makefile | 1
fs/cachefiles_old/Kconfig | 6 +
fs/fscache/Kconfig | 40 +++++++++
fs/fscache/Makefile | 12 +++
fs/fscache/internal.h | 183 ++++++++++++++++++++++++++++++++++++++++
fs/fscache/main.c | 65 ++++++++++++++
fs/fscache/proc.c | 42 +++++++++
fs/fscache/stats.c | 22 +++++
fs/fscache_old/Kconfig | 4 +
include/linux/fscache-cache.h | 21 +++++
include/linux/fscache.h | 33 +++++++
include/trace/events/fscache.h | 49 +++++++++++
13 files changed, 478 insertions(+), 1 deletion(-)
create mode 100644 fs/fscache/Kconfig
create mode 100644 fs/fscache/Makefile
create mode 100644 fs/fscache/internal.h
create mode 100644 fs/fscache/main.c
create mode 100644 fs/fscache/proc.c
create mode 100644 fs/fscache/stats.c
create mode 100644 include/linux/fscache-cache.h
create mode 100644 include/linux/fscache.h
create mode 100644 include/trace/events/fscache.h
diff --git a/fs/Kconfig b/fs/Kconfig
index 944f8b21f17c..68f662c09a8d 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -131,6 +131,7 @@ source "fs/overlayfs/Kconfig"
menu "Caches"
source "fs/netfs/Kconfig"
+source "fs/fscache/Kconfig"
source "fs/fscache_old/Kconfig"
source "fs/cachefiles_old/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index e5cb91ecb29f..0dd8a4d526ad 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_DLM) += dlm/
# Do not add any filesystems before this line
obj-$(CONFIG_NETFS_SUPPORT) += netfs/
+obj-$(CONFIG_FSCACHE) += fscache/
obj-$(CONFIG_FSCACHE_OLD) += fscache_old/
obj-$(CONFIG_REISERFS_FS) += reiserfs/
obj-$(CONFIG_EXT4_FS) += ext4/
diff --git a/fs/cachefiles_old/Kconfig b/fs/cachefiles_old/Kconfig
index 48977018c64e..f1a657df6edd 100644
--- a/fs/cachefiles_old/Kconfig
+++ b/fs/cachefiles_old/Kconfig
@@ -2,12 +2,16 @@
config CACHEFILES_OLD
tristate "Filesystem caching on files (old driver)"
- depends on FSCACHE_OLD && BLOCK
+ depends on FSCACHE_OLD && BLOCK && !FSCACHE
help
This permits use of a mounted filesystem as a cache for other
filesystems - primarily networking filesystems - thus allowing fast
local disk to enhance the speed of slower devices.
+ [!] Note that this is mutually exclusive with the new cachefiles
+ driver. Only one may be built as they share a lot of the same
+ symbols and also want to register the same device file.
+
See Documentation/filesystems/caching/cachefiles.rst for more
information.
diff --git a/fs/fscache/Kconfig b/fs/fscache/Kconfig
new file mode 100644
index 000000000000..b313a978ae0a
--- /dev/null
+++ b/fs/fscache/Kconfig
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config FSCACHE
+ tristate "General filesystem local caching manager"
+ select NETFS_SUPPORT
+ help
+ This option enables a generic filesystem caching manager that can be
+ used by various network and other filesystems to cache data locally.
+ Different sorts of caches can be plugged in, depending on the
+ resources available.
+
+ See Documentation/filesystems/caching/fscache.rst for more information.
+
+config FSCACHE_STATS
+ bool "Gather statistical information on local caching"
+ depends on FSCACHE && PROC_FS
+ select NETFS_STATS
+ help
+ This option causes statistical information to be gathered on local
+ caching and exported through file:
+
+ /proc/fs/fscache/stats
+
+ The gathering of statistics adds a certain amount of overhead to
+ execution as there are a quite a few stats gathered, and on a
+ multi-CPU system these may be on cachelines that keep bouncing
+ between CPUs. On the other hand, the stats are very useful for
+ debugging purposes. Saying 'Y' here is recommended.
+
+ See Documentation/filesystems/caching/fscache.rst for more information.
+
+config FSCACHE_DEBUG
+ bool "Debug FS-Cache"
+ depends on FSCACHE
+ help
+ This permits debugging to be dynamically enabled in the local caching
+ management module. If this is set, the debugging output may be
+ enabled by setting bits in /sys/modules/fscache/parameter/debug.
+
+ See Documentation/filesystems/caching/fscache.rst for more information.
diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile
new file mode 100644
index 000000000000..f9722de32247
--- /dev/null
+++ b/fs/fscache/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for general filesystem caching code
+#
+
+fscache-y := \
+ main.o
+
+fscache-$(CONFIG_PROC_FS) += proc.o
+fscache-$(CONFIG_FSCACHE_STATS) += stats.o
+
+obj-$(CONFIG_FSCACHE) := fscache.o
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
new file mode 100644
index 000000000000..ea52f8594a77
--- /dev/null
+++ b/fs/fscache/internal.h
@@ -0,0 +1,183 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Internal definitions for FS-Cache
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+
+#define pr_fmt(fmt) "FS-Cache: " fmt
+
+#include <linux/slab.h>
+#include <linux/fscache-cache.h>
+#include <trace/events/fscache.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+
+/*
+ * main.c
+ */
+extern unsigned fscache_debug;
+
+/*
+ * proc.c
+ */
+#ifdef CONFIG_PROC_FS
+extern int __init fscache_proc_init(void);
+extern void fscache_proc_cleanup(void);
+#else
+#define fscache_proc_init() (0)
+#define fscache_proc_cleanup() do {} while (0)
+#endif
+
+/*
+ * stats.c
+ */
+#ifdef CONFIG_FSCACHE_STATS
+
+static inline void fscache_stat(atomic_t *stat)
+{
+ atomic_inc(stat);
+}
+
+static inline void fscache_stat_d(atomic_t *stat)
+{
+ atomic_dec(stat);
+}
+
+#define __fscache_stat(stat) (stat)
+
+int fscache_stats_show(struct seq_file *m, void *v);
+#else
+
+#define __fscache_stat(stat) (NULL)
+#define fscache_stat(stat) do {} while (0)
+#define fscache_stat_d(stat) do {} while (0)
+#endif
+
+
+/*****************************************************************************/
+/*
+ * debug tracing
+ */
+#define dbgprintk(FMT, ...) \
+ printk("[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
+
+#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
+
+#define kjournal(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
+
+#ifdef __KDEBUG
+#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
+#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
+#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
+
+#elif defined(CONFIG_FSCACHE_DEBUG)
+#define _enter(FMT, ...) \
+do { \
+ if (__do_kdebug(ENTER)) \
+ kenter(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _leave(FMT, ...) \
+do { \
+ if (__do_kdebug(LEAVE)) \
+ kleave(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _debug(FMT, ...) \
+do { \
+ if (__do_kdebug(DEBUG)) \
+ kdebug(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#else
+#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
+#endif
+
+/*
+ * determine whether a particular optional debugging point should be logged
+ * - we need to go through three steps to persuade cpp to correctly join the
+ * shorthand in FSCACHE_DEBUG_LEVEL with its prefix
+ */
+#define ____do_kdebug(LEVEL, POINT) \
+ unlikely((fscache_debug & \
+ (FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
+#define ___do_kdebug(LEVEL, POINT) \
+ ____do_kdebug(LEVEL, POINT)
+#define __do_kdebug(POINT) \
+ ___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
+
+#define FSCACHE_DEBUG_CACHE 0
+#define FSCACHE_DEBUG_COOKIE 1
+#define FSCACHE_DEBUG_OBJECT 2
+#define FSCACHE_DEBUG_OPERATION 3
+
+#define FSCACHE_POINT_ENTER 1
+#define FSCACHE_POINT_LEAVE 2
+#define FSCACHE_POINT_DEBUG 4
+
+#ifndef FSCACHE_DEBUG_LEVEL
+#define FSCACHE_DEBUG_LEVEL CACHE
+#endif
+
+/*
+ * assertions
+ */
+#if 1 /* defined(__KDEBUGALL) */
+
+#define ASSERT(X) \
+do { \
+ if (unlikely(!(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+ if (unlikely(!((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIF(C, X) \
+do { \
+ if (unlikely((C) && !(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+ if (unlikely((C) && !((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#else
+
+#define ASSERT(X) do {} while (0)
+#define ASSERTCMP(X, OP, Y) do {} while (0)
+#define ASSERTIF(C, X) do {} while (0)
+#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
+
+#endif /* assert or not */
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
new file mode 100644
index 000000000000..819de2ee1276
--- /dev/null
+++ b/fs/fscache/main.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* General filesystem local caching manager
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/module.h>
+#include <linux/init.h>
+#define CREATE_TRACE_POINTS
+#include "internal.h"
+
+MODULE_DESCRIPTION("FS Cache Manager");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+unsigned fscache_debug;
+module_param_named(debug, fscache_debug, uint,
+ S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(fscache_debug,
+ "FS-Cache debugging mask");
+
+struct workqueue_struct *fscache_wq;
+EXPORT_SYMBOL(fscache_wq);
+
+/*
+ * initialise the fs caching module
+ */
+static int __init fscache_init(void)
+{
+ int ret = -ENOMEM;
+
+ fscache_wq = alloc_workqueue("fscache", WQ_UNBOUND | WQ_FREEZABLE, 0);
+ if (!fscache_wq)
+ goto error_wq;
+
+ ret = fscache_proc_init();
+ if (ret < 0)
+ goto error_proc;
+
+ pr_notice("Loaded\n");
+ return 0;
+
+error_proc:
+ destroy_workqueue(fscache_wq);
+error_wq:
+ return ret;
+}
+
+fs_initcall(fscache_init);
+
+/*
+ * clean up on module removal
+ */
+static void __exit fscache_exit(void)
+{
+ _enter("");
+
+ fscache_proc_cleanup();
+ destroy_workqueue(fscache_wq);
+ pr_notice("Unloaded\n");
+}
+
+module_exit(fscache_exit);
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
new file mode 100644
index 000000000000..b28003d7d63f
--- /dev/null
+++ b/fs/fscache/proc.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache statistics viewing interface
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include "internal.h"
+
+/*
+ * initialise the /proc/fs/fscache/ directory
+ */
+int __init fscache_proc_init(void)
+{
+ if (!proc_mkdir("fs/fscache", NULL))
+ goto error_dir;
+
+#ifdef CONFIG_FSCACHE_STATS
+ if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
+ fscache_stats_show))
+ goto error;
+#endif
+
+ return 0;
+
+error:
+ remove_proc_entry("fs/fscache", NULL);
+error_dir:
+ return -ENOMEM;
+}
+
+/*
+ * clean up the /proc/fs/fscache/ directory
+ */
+void fscache_proc_cleanup(void)
+{
+ remove_proc_entry("fs/fscache", NULL);
+}
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
new file mode 100644
index 000000000000..bd92f93e1680
--- /dev/null
+++ b/fs/fscache/stats.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache statistics
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include "internal.h"
+
+/*
+ * display the general statistics
+ */
+int fscache_stats_show(struct seq_file *m, void *v)
+{
+ seq_puts(m, "FS-Cache statistics\n");
+
+ netfs_stats_show(m);
+ return 0;
+}
diff --git a/fs/fscache_old/Kconfig b/fs/fscache_old/Kconfig
index a5a657246df8..1e2e804e96f6 100644
--- a/fs/fscache_old/Kconfig
+++ b/fs/fscache_old/Kconfig
@@ -2,6 +2,7 @@
config FSCACHE_OLD
tristate "General filesystem local caching manager (old driver)"
+ depends on FSCACHE=n
select NETFS_SUPPORT
help
This option enables a generic filesystem caching manager that can be
@@ -9,6 +10,9 @@ config FSCACHE_OLD
Different sorts of caches can be plugged in, depending on the
resources available.
+ [!] Note that this is mutually exclusive with the new fscache driver.
+ Only one may be built as they share a lot of the same symbols.
+
See Documentation/filesystems/caching/fscache.rst for more information.
config FSCACHE_OLD_STATS
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
new file mode 100644
index 000000000000..d6910a913918
--- /dev/null
+++ b/include/linux/fscache-cache.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* General filesystem caching backing cache interface
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * NOTE!!! See:
+ *
+ * Documentation/filesystems/caching/backend-api.rst
+ *
+ * for a description of the cache backend interface declared here.
+ */
+
+#ifndef _LINUX_FSCACHE_CACHE_H
+#define _LINUX_FSCACHE_CACHE_H
+
+#include <linux/fscache.h>
+
+extern struct workqueue_struct *fscache_wq;
+
+#endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
new file mode 100644
index 000000000000..18c5336e41a5
--- /dev/null
+++ b/include/linux/fscache.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* General filesystem caching interface
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * NOTE!!! See:
+ *
+ * Documentation/filesystems/caching/netfs-api.rst
+ *
+ * for a description of the network filesystem interface declared here.
+ */
+
+#ifndef _LINUX_FSCACHE_H
+#define _LINUX_FSCACHE_H
+
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/pagemap.h>
+#include <linux/pagevec.h>
+#include <linux/list_bl.h>
+#include <linux/writeback.h>
+#include <linux/netfs.h>
+
+#if defined(CONFIG_FSCACHE) || defined(CONFIG_FSCACHE_MODULE)
+#define __fscache_available (1)
+#define fscache_available() (1)
+#else
+#define __fscache_available (0)
+#define fscache_available() (0)
+#endif
+
+#endif /* _LINUX_FSCACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
new file mode 100644
index 000000000000..fe214c5cc87f
--- /dev/null
+++ b/include/trace/events/fscache.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* FS-Cache tracepoints
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fscache
+
+#if !defined(_TRACE_FSCACHE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FSCACHE_H
+
+#include <linux/fscache.h>
+#include <linux/tracepoint.h>
+
+/*
+ * Define enums for tracing information.
+ */
+#ifndef __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
+#define __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
+
+#endif
+
+/*
+ * Declare tracing information enums and their string mappings for display.
+ */
+
+/*
+ * Export enum symbols via userspace.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) TRACE_DEFINE_ENUM(a);
+#define E_(a, b) TRACE_DEFINE_ENUM(a);
+
+/*
+ * Now redefine the EM() and E_() macros to map the enums to the strings that
+ * will be printed in the output.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) { a, b },
+#define E_(a, b) { a, b }
+
+
+#endif /* _TRACE_FSCACHE_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 08/53] fscache: Implement a hash function
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (6 preceding siblings ...)
2021-10-22 19:00 ` [PATCH v2 07/53] fscache: Introduce new driver David Howells
@ 2021-10-22 19:01 ` David Howells
2021-10-22 19:01 ` [PATCH v2 09/53] fscache: Implement cache registration David Howells
` (46 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:01 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement a function to generate hashes. It needs to be stable over time
and endianness-independent as the hashes will appear on disk in future
patches. It can assume that its input is a multiple of four bytes in size
and alignment.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/internal.h | 2 ++
fs/fscache/main.c | 39 +++++++++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index ea52f8594a77..64767992bd15 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -22,6 +22,8 @@
*/
extern unsigned fscache_debug;
+extern unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n);
+
/*
* proc.c
*/
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index 819de2ee1276..a4afba1b9d3b 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -24,6 +24,45 @@ MODULE_PARM_DESC(fscache_debug,
struct workqueue_struct *fscache_wq;
EXPORT_SYMBOL(fscache_wq);
+/*
+ * Mixing scores (in bits) for (7,20):
+ * Input delta: 1-bit 2-bit
+ * 1 round: 330.3 9201.6
+ * 2 rounds: 1246.4 25475.4
+ * 3 rounds: 1907.1 31295.1
+ * 4 rounds: 2042.3 31718.6
+ * Perfect: 2048 31744
+ * (32*64) (32*31/2 * 64)
+ */
+#define HASH_MIX(x, y, a) \
+ ( x ^= (a), \
+ y ^= x, x = rol32(x, 7),\
+ x += y, y = rol32(y,20),\
+ y *= 9 )
+
+static inline unsigned int fold_hash(unsigned long x, unsigned long y)
+{
+ /* Use arch-optimized multiply if one exists */
+ return __hash_32(y ^ __hash_32(x));
+}
+
+/*
+ * Generate a hash. This is derived from full_name_hash(), but we want to be
+ * sure it is arch independent and that it doesn't change as bits of the
+ * computed hash value might appear on disk. The caller also guarantees that
+ * the hashed data will be a series of aligned 32-bit words.
+ */
+unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n)
+{
+ unsigned int a, x = 0, y = salt;
+
+ for (; n; n--) {
+ a = *data++;
+ HASH_MIX(x, y, a);
+ }
+ return fold_hash(x, y);
+}
+
/*
* initialise the fs caching module
*/
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 09/53] fscache: Implement cache registration
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (7 preceding siblings ...)
2021-10-22 19:01 ` [PATCH v2 08/53] fscache: Implement a hash function David Howells
@ 2021-10-22 19:01 ` David Howells
2021-10-22 19:01 ` [PATCH v2 10/53] fscache: Implement volume registration David Howells
` (45 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:01 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement helper functions to acquire a cache record and put a reference on
it. These are used both as part of cache registration by the cache backend
and as part of cache request by the network filesystem.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/Makefile | 1
fs/fscache/cache.c | 229 ++++++++++++++++++++++++++++++++++++++++
fs/fscache/internal.h | 8 +
fs/fscache/proc.c | 4 +
include/linux/fscache-cache.h | 60 ++++++++++
include/trace/events/fscache.h | 37 ++++++
6 files changed, 339 insertions(+)
create mode 100644 fs/fscache/cache.c
diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile
index f9722de32247..d9fc22c18090 100644
--- a/fs/fscache/Makefile
+++ b/fs/fscache/Makefile
@@ -4,6 +4,7 @@
#
fscache-y := \
+ cache.o \
main.o
fscache-$(CONFIG_PROC_FS) += proc.o
diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
new file mode 100644
index 000000000000..da08e29ee5b9
--- /dev/null
+++ b/fs/fscache/cache.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache cache handling
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL CACHE
+#include <linux/export.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+static LIST_HEAD(fscache_caches);
+DECLARE_RWSEM(fscache_addremove_sem);
+EXPORT_SYMBOL(fscache_addremove_sem);
+
+static atomic_t fscache_cache_debug_id;
+
+/*
+ * Allocate a cache cookie.
+ */
+static struct fscache_cache *fscache_alloc_cache(const char *name)
+{
+ struct fscache_cache *cache;
+
+ cache = kzalloc(sizeof(*cache), GFP_KERNEL);
+ if (cache) {
+ if (name) {
+ cache->name = kstrdup(name, GFP_KERNEL);
+ if (!cache->name) {
+ kfree(cache);
+ return NULL;
+ }
+ }
+ refcount_set(&cache->ref, 1);
+ INIT_LIST_HEAD(&cache->cache_link);
+ cache->debug_id = atomic_inc_return(&fscache_cache_debug_id);
+ }
+ return cache;
+}
+
+static bool fscache_get_cache_maybe(struct fscache_cache *cache,
+ enum fscache_cache_trace where)
+{
+ bool success;
+ int ref;
+
+ success = __refcount_inc_not_zero(&cache->ref, &ref);
+ if (success)
+ trace_fscache_cache(cache->debug_id, ref + 1, where);
+ return success;
+}
+
+/*
+ * Look up a cache cookie.
+ */
+struct fscache_cache *fscache_lookup_cache(const char *name, bool is_cache)
+{
+ struct fscache_cache *candidate, *cache, *unnamed = NULL;
+
+ /* firstly check for the existence of the cache under read lock */
+ down_read(&fscache_addremove_sem);
+
+ list_for_each_entry(cache, &fscache_caches, cache_link) {
+ if (cache->name && name && strcmp(cache->name, name) == 0 &&
+ fscache_get_cache_maybe(cache, fscache_cache_get_acquire))
+ goto got_cache_r;
+ if (!cache->name && !name &&
+ fscache_get_cache_maybe(cache, fscache_cache_get_acquire))
+ goto got_cache_r;
+ }
+
+ if (!name) {
+ list_for_each_entry(cache, &fscache_caches, cache_link) {
+ if (cache->name &&
+ fscache_get_cache_maybe(cache, fscache_cache_get_acquire))
+ goto got_cache_r;
+ }
+ }
+
+ up_read(&fscache_addremove_sem);
+
+ /* the cache does not exist - create a candidate */
+ candidate = fscache_alloc_cache(name);
+ if (!candidate)
+ return ERR_PTR(-ENOMEM);
+
+ /* write lock, search again and add if still not present */
+ down_write(&fscache_addremove_sem);
+
+ list_for_each_entry(cache, &fscache_caches, cache_link) {
+ if (cache->name && name && strcmp(cache->name, name) == 0 &&
+ fscache_get_cache_maybe(cache, fscache_cache_get_acquire))
+ goto got_cache_w;
+ if (!cache->name) {
+ unnamed = cache;
+ if (!name &&
+ fscache_get_cache_maybe(cache, fscache_cache_get_acquire))
+ goto got_cache_w;
+ }
+ }
+
+ if (unnamed && is_cache &&
+ fscache_get_cache_maybe(unnamed, fscache_cache_get_acquire))
+ goto use_unnamed_cache;
+
+ if (!name) {
+ list_for_each_entry(cache, &fscache_caches, cache_link) {
+ if (cache->name &&
+ fscache_get_cache_maybe(cache, fscache_cache_get_acquire))
+ goto got_cache_w;
+ }
+ }
+
+ list_add_tail(&candidate->cache_link, &fscache_caches);
+ trace_fscache_cache(candidate->debug_id,
+ refcount_read(&candidate->ref),
+ fscache_cache_new_acquire);
+ up_write(&fscache_addremove_sem);
+ return candidate;
+
+got_cache_r:
+ up_read(&fscache_addremove_sem);
+ return cache;
+use_unnamed_cache:
+ cache = unnamed;
+ cache->name = candidate->name;
+ candidate->name = NULL;
+got_cache_w:
+ up_write(&fscache_addremove_sem);
+ kfree(candidate->name);
+ kfree(candidate);
+ return cache;
+}
+
+/**
+ * fscache_acquire_cache - Acquire a cache record for a cache.
+ * @name: The name of the cache.
+ *
+ * Get a cache record for a cache. If there is a nameless cache record
+ * available, this will acquire that and set its name, directing all the
+ * volumes using it to this cache.
+ */
+struct fscache_cache *fscache_acquire_cache(const char *name)
+{
+ ASSERT(name);
+ return fscache_lookup_cache(name, true);
+}
+EXPORT_SYMBOL(fscache_acquire_cache);
+
+void fscache_put_cache(struct fscache_cache *cache,
+ enum fscache_cache_trace where)
+{
+ unsigned int debug_id = cache->debug_id;
+ bool zero;
+ int ref;
+
+ if (IS_ERR_OR_NULL(cache))
+ return;
+
+ zero = __refcount_dec_and_test(&cache->ref, &ref);
+ trace_fscache_cache(debug_id, ref - 1, where);
+
+ if (zero) {
+ down_write(&fscache_addremove_sem);
+ list_del_init(&cache->cache_link);
+ up_write(&fscache_addremove_sem);
+ kfree(cache->name);
+ kfree(cache);
+ }
+}
+EXPORT_SYMBOL(fscache_put_cache);
+
+#ifdef CONFIG_PROC_FS
+static const char fscache_cache_states[NR__FSCACHE_CACHE_STATE] = "-PAEW";
+
+/*
+ * Generate a list of caches in /proc/fs/fscache/caches
+ */
+static int fscache_caches_seq_show(struct seq_file *m, void *v)
+{
+ struct fscache_cache *cache;
+
+ if (v == &fscache_caches) {
+ seq_puts(m,
+ "CACHE REF VOLS OBJS ACCES S NAME\n"
+ "======== ===== ===== ===== ===== = ===============\n"
+ );
+ return 0;
+ }
+
+ cache = list_entry(v, struct fscache_cache, cache_link);
+ seq_printf(m,
+ "%08x %5d %5d %5d %5d %c %s\n",
+ cache->debug_id,
+ refcount_read(&cache->ref),
+ atomic_read(&cache->n_volumes),
+ atomic_read(&cache->object_count),
+ atomic_read(&cache->n_accesses),
+ fscache_cache_states[cache->state],
+ cache->name ?: "-");
+ return 0;
+}
+
+static void *fscache_caches_seq_start(struct seq_file *m, loff_t *_pos)
+ __acquires(fscache_addremove_sem)
+{
+ down_read(&fscache_addremove_sem);
+ return seq_list_start_head(&fscache_caches, *_pos);
+}
+
+static void *fscache_caches_seq_next(struct seq_file *m, void *v, loff_t *_pos)
+{
+ return seq_list_next(v, &fscache_caches, _pos);
+}
+
+static void fscache_caches_seq_stop(struct seq_file *m, void *v)
+ __releases(fscache_addremove_sem)
+{
+ up_read(&fscache_addremove_sem);
+}
+
+const struct seq_operations fscache_caches_seq_ops = {
+ .start = fscache_caches_seq_start,
+ .next = fscache_caches_seq_next,
+ .stop = fscache_caches_seq_stop,
+ .show = fscache_caches_seq_show,
+};
+#endif /* CONFIG_PROC_FS */
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 64767992bd15..8ac81294e43e 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -17,6 +17,14 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
+/*
+ * cache.c
+ */
+#ifdef CONFIG_PROC_FS
+extern const struct seq_operations fscache_caches_seq_ops;
+#endif
+struct fscache_cache *fscache_lookup_cache(const char *name, bool is_cache);
+
/*
* main.c
*/
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
index b28003d7d63f..7400568bf85e 100644
--- a/fs/fscache/proc.c
+++ b/fs/fscache/proc.c
@@ -19,6 +19,10 @@ int __init fscache_proc_init(void)
if (!proc_mkdir("fs/fscache", NULL))
goto error_dir;
+ if (!proc_create_seq("fs/fscache/caches", S_IFREG | 0444, NULL,
+ &fscache_caches_seq_ops))
+ goto error;
+
#ifdef CONFIG_FSCACHE_STATS
if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
fscache_stats_show))
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index d6910a913918..f6429e5ba6e7 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -16,6 +16,66 @@
#include <linux/fscache.h>
+struct fscache_cache;
+enum fscache_cache_trace;
+enum fscache_access_trace;
+
+enum fscache_cache_state {
+ FSCACHE_CACHE_IS_NOT_PRESENT, /* No cache is present for this name */
+ FSCACHE_CACHE_IS_PREPARING, /* A cache is preparing to come live */
+ FSCACHE_CACHE_IS_ACTIVE, /* Attached cache is active and can be used */
+ FSCACHE_CACHE_GOT_IOERROR, /* Attached cache stopped on I/O error */
+ FSCACHE_CACHE_IS_WITHDRAWN, /* Attached cache is being withdrawn */
+#define NR__FSCACHE_CACHE_STATE (FSCACHE_CACHE_IS_WITHDRAWN + 1)
+};
+
+/*
+ * Cache cookie.
+ */
+struct fscache_cache {
+ struct list_head cache_link; /* Link in cache list */
+ void *cache_priv; /* Private cache data (or NULL) */
+ refcount_t ref;
+ atomic_t n_volumes; /* Number of active volumes; */
+ atomic_t n_accesses; /* Number of in-progress accesses on the cache */
+ atomic_t object_count; /* no. of live objects in this cache */
+ unsigned int debug_id;
+ enum fscache_cache_state state;
+ char *name;
+};
+
+static inline enum fscache_cache_state fscache_cache_state(const struct fscache_cache *cache)
+{
+ return smp_load_acquire(&cache->state);
+}
+
+static inline bool fscache_cache_is_live(const struct fscache_cache *cache)
+{
+ return fscache_cache_state(cache) == FSCACHE_CACHE_IS_ACTIVE;
+}
+
+static inline void fscache_set_cache_state(struct fscache_cache *cache,
+ enum fscache_cache_state new_state)
+{
+ smp_store_release(&cache->state, new_state);
+
+}
+
+static inline bool fscache_set_cache_state_maybe(struct fscache_cache *cache,
+ enum fscache_cache_state old_state,
+ enum fscache_cache_state new_state)
+{
+ return try_cmpxchg_release(&cache->state, &old_state, new_state);
+}
+
+/*
+ * out-of-line cache backend functions
+ */
+extern struct rw_semaphore fscache_addremove_sem;
+extern struct fscache_cache *fscache_acquire_cache(const char *name);
+extern void fscache_put_cache(struct fscache_cache *cache,
+ enum fscache_cache_trace where);
+
extern struct workqueue_struct *fscache_wq;
#endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index fe214c5cc87f..3263cbf32961 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -19,11 +19,21 @@
#ifndef __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
#define __FSCACHE_DECLARE_TRACE_ENUMS_ONCE_ONLY
+enum fscache_cache_trace {
+ fscache_cache_collision,
+ fscache_cache_get_acquire,
+ fscache_cache_new_acquire,
+};
+
#endif
/*
* Declare tracing information enums and their string mappings for display.
*/
+#define fscache_cache_traces \
+ EM(fscache_cache_collision, "*COLLIDE*") \
+ EM(fscache_cache_get_acquire, "GET acq ") \
+ E_(fscache_cache_new_acquire, "NEW acq ")
/*
* Export enum symbols via userspace.
@@ -33,6 +43,8 @@
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define E_(a, b) TRACE_DEFINE_ENUM(a);
+fscache_cache_traces;
+
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
* will be printed in the output.
@@ -43,6 +55,31 @@
#define E_(a, b) { a, b }
+TRACE_EVENT(fscache_cache,
+ TP_PROTO(unsigned int cache_debug_id,
+ int usage,
+ enum fscache_cache_trace where),
+
+ TP_ARGS(cache_debug_id, usage, where),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cache )
+ __field(int, usage )
+ __field(enum fscache_cache_trace, where )
+ ),
+
+ TP_fast_assign(
+ __entry->cache = cache_debug_id;
+ __entry->usage = usage;
+ __entry->where = where;
+ ),
+
+ TP_printk("C=%08x %s r=%d",
+ __entry->cache,
+ __print_symbolic(__entry->where, fscache_cache_traces),
+ __entry->usage)
+ );
+
#endif /* _TRACE_FSCACHE_H */
/* This part must be outside protection */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 10/53] fscache: Implement volume registration
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (8 preceding siblings ...)
2021-10-22 19:01 ` [PATCH v2 09/53] fscache: Implement cache registration David Howells
@ 2021-10-22 19:01 ` David Howells
2021-10-22 19:01 ` [PATCH v2 11/53] fscache: Implement cookie registration David Howells
` (44 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:01 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add functions to the fscache API to allow volume indices to be acquired and
relinquished by the network filesystem. The filesystem would typically
create a volume index for a superblock and then create per-inode cookies
within it.
When it requests a volume, it uses:
struct fscache_volume *
fscache_acquire_volume(const char *volume_key,
const char *cache_name,
u64 coherency_data)
The volume_key is a printable string that is used to look up a volume in
the cache. It should not contain any '/' characters. For AFS, for
example, this would be "afs,<cellname>,<volume_id>",
e.g. "afs,example.com,523001".
The cache_name can be NULL, but if not it should be a string indicating the
name of the cache to use if there's more than one available.
The coherency data is a 64-bit integer that's attached to the volume and is
compared when the volume is looked up. If it doesn't match, the old volume
is judged out of date and it and everything within it is discarded.
This function disallows a volume from being acquired twice in parallel,
though it will cause the second user to wait if the first is busy
relinquishing its volume.
When a network filesystem has finished with a volume, it should call:
void
fscache_relinquish_volume(struct fscache_volume *volume,
u64 coherency_data,
bool invalidate)
If invalidate is true, the entire volume will be discarded; if false, the
volume will be synced and the coherency_data will be set.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/Makefile | 3
fs/fscache/internal.h | 14 ++
fs/fscache/proc.c | 4
fs/fscache/stats.c | 12 +
fs/fscache/volume.c | 342 ++++++++++++++++++++++++++++++++++++++++
include/linux/fscache.h | 77 +++++++++
include/trace/events/fscache.h | 61 +++++++
7 files changed, 511 insertions(+), 2 deletions(-)
create mode 100644 fs/fscache/volume.c
diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile
index d9fc22c18090..bb5282ae682f 100644
--- a/fs/fscache/Makefile
+++ b/fs/fscache/Makefile
@@ -5,7 +5,8 @@
fscache-y := \
cache.o \
- main.o
+ main.o \
+ volume.o
fscache-$(CONFIG_PROC_FS) += proc.o
fscache-$(CONFIG_FSCACHE_STATS) += stats.o
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 8ac81294e43e..18c099363b62 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -47,6 +47,9 @@ extern void fscache_proc_cleanup(void);
* stats.c
*/
#ifdef CONFIG_FSCACHE_STATS
+extern atomic_t fscache_n_volumes;
+extern atomic_t fscache_n_volumes_collision;
+extern atomic_t fscache_n_volumes_nomem;
static inline void fscache_stat(atomic_t *stat)
{
@@ -68,6 +71,17 @@ int fscache_stats_show(struct seq_file *m, void *v);
#define fscache_stat_d(stat) do {} while (0)
#endif
+/*
+ * volume.c
+ */
+extern const struct seq_operations fscache_volumes_seq_ops;
+
+struct fscache_volume *fscache_get_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where);
+void fscache_put_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where);
+void fscache_create_volume(struct fscache_volume *volume, bool wait);
+
/*****************************************************************************/
/*
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
index 7400568bf85e..c6970d4a44f1 100644
--- a/fs/fscache/proc.c
+++ b/fs/fscache/proc.c
@@ -23,6 +23,10 @@ int __init fscache_proc_init(void)
&fscache_caches_seq_ops))
goto error;
+ if (!proc_create_seq("fs/fscache/volumes", S_IFREG | 0444, NULL,
+ &fscache_volumes_seq_ops))
+ goto error;
+
#ifdef CONFIG_FSCACHE_STATS
if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
fscache_stats_show))
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index bd92f93e1680..b811a4d03585 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -10,12 +10,24 @@
#include <linux/seq_file.h>
#include "internal.h"
+/*
+ * operation counters
+ */
+atomic_t fscache_n_volumes;
+atomic_t fscache_n_volumes_collision;
+atomic_t fscache_n_volumes_nomem;
+
/*
* display the general statistics
*/
int fscache_stats_show(struct seq_file *m, void *v)
{
seq_puts(m, "FS-Cache statistics\n");
+ seq_printf(m, "Cookies: v=%d vcol=%u voom=%u\n",
+ atomic_read(&fscache_n_volumes),
+ atomic_read(&fscache_n_volumes_collision),
+ atomic_read(&fscache_n_volumes_nomem)
+ );
netfs_stats_show(m);
return 0;
diff --git a/fs/fscache/volume.c b/fs/fscache/volume.c
new file mode 100644
index 000000000000..924851888f18
--- /dev/null
+++ b/fs/fscache/volume.c
@@ -0,0 +1,342 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Volume-level cache cookie handling.
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define FSCACHE_DEBUG_LEVEL COOKIE
+#include <linux/export.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+#define fscache_volume_hash_shift 10
+static struct hlist_bl_head fscache_volume_hash[1 << fscache_volume_hash_shift];
+static atomic_t fscache_volume_debug_id;
+static LIST_HEAD(fscache_volumes);
+
+struct fscache_volume *fscache_get_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where)
+{
+ int ref;
+
+ __refcount_inc(&volume->ref, &ref);
+ trace_fscache_volume(volume->debug_id, ref + 1, where);
+ return volume;
+}
+
+static void fscache_see_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where)
+{
+ int ref = refcount_read(&volume->ref);
+
+ trace_fscache_volume(volume->debug_id, ref, where);
+}
+
+static long fscache_compare_volume(const struct fscache_volume *a,
+ const struct fscache_volume *b)
+{
+ size_t klen;
+
+ if (a->key_hash != b->key_hash)
+ return (long)a->key_hash - (long)b->key_hash;
+ if (a->cache != b->cache)
+ return (long)a->cache - (long)b->cache;
+ if (a->key[0] != b->key[0])
+ return (long)a->key[0] - (long)b->key[0];
+
+ klen = round_up(a->key[0] + 1, sizeof(unsigned int));
+ return memcmp(a->key, b->key, klen);
+}
+
+static bool fscache_is_acquire_pending(struct fscache_volume *volume)
+{
+ return test_bit(FSCACHE_VOLUME_ACQUIRE_PENDING, &volume->flags);
+}
+
+static void fscache_wait_on_volume_collision(struct fscache_volume *candidate,
+ unsigned int collidee_debug_id)
+{
+ wait_var_event_timeout(&candidate->flags,
+ fscache_is_acquire_pending(candidate), 20 * HZ);
+ if (!fscache_is_acquire_pending(candidate)) {
+ pr_notice("Potential volume collision new=%08x old=%08x",
+ candidate->debug_id, collidee_debug_id);
+ fscache_stat(&fscache_n_volumes_collision);
+ wait_var_event(&candidate->flags, fscache_is_acquire_pending(candidate));
+ }
+}
+
+/*
+ * Attempt to insert the new volume into the hash. If there's a collision, we
+ * wait for the old volume to complete if it's being relinquished and an error
+ * otherwise.
+ */
+static struct fscache_volume *fscache_hash_volume(struct fscache_volume *candidate)
+{
+ struct fscache_volume *cursor;
+ struct hlist_bl_head *h;
+ struct hlist_bl_node *p;
+ unsigned int bucket, collidee_debug_id = 0;
+
+ bucket = candidate->key_hash & (ARRAY_SIZE(fscache_volume_hash) - 1);
+ h = &fscache_volume_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_for_each_entry(cursor, p, h, hash_link) {
+ if (fscache_compare_volume(candidate, cursor) == 0) {
+ if (!test_bit(FSCACHE_VOLUME_RELINQUISHED, &cursor->flags))
+ goto collision;
+ fscache_see_volume(cursor, fscache_volume_get_hash_collision);
+ set_bit(FSCACHE_VOLUME_COLLIDED_WITH, &cursor->flags);
+ set_bit(FSCACHE_VOLUME_ACQUIRE_PENDING, &candidate->flags);
+ collidee_debug_id = cursor->debug_id;
+ break;
+ }
+ }
+
+ hlist_bl_add_head(&candidate->hash_link, h);
+ hlist_bl_unlock(h);
+
+ if (test_bit(FSCACHE_VOLUME_ACQUIRE_PENDING, &candidate->flags))
+ fscache_wait_on_volume_collision(candidate, collidee_debug_id);
+ return candidate;
+
+collision:
+ fscache_see_volume(cursor, fscache_volume_collision);
+ pr_err("Cache volume already in use\n");
+ hlist_bl_unlock(h);
+ return NULL;
+}
+
+/*
+ * Allocate and initialise a volume representation cookie.
+ */
+static struct fscache_volume *fscache_alloc_volume(const char *volume_key,
+ const char *cache_name,
+ u64 coherency_data)
+{
+ struct fscache_volume *volume;
+ struct fscache_cache *cache;
+ size_t klen, hlen;
+ char *key;
+
+ cache = fscache_lookup_cache(cache_name, false);
+ if (!cache)
+ return NULL;
+
+ volume = kzalloc(sizeof(*volume), GFP_KERNEL);
+ if (!volume)
+ goto err_cache;
+
+ volume->cache = cache;
+ volume->coherency = coherency_data;
+ INIT_LIST_HEAD(&volume->proc_link);
+ INIT_WORK(&volume->work, NULL /* PLACEHOLDER */);
+ refcount_set(&volume->ref, 1);
+ spin_lock_init(&volume->lock);
+
+ /* Stick the length on the front of the key and pad it out to make
+ * hashing easier.
+ */
+ klen = strlen(volume_key);
+ hlen = round_up(1 + klen + 1, sizeof(unsigned int));
+ key = kzalloc(hlen, GFP_KERNEL);
+ if (!key)
+ goto err_vol;
+ key[0] = klen;
+ memcpy(key + 1, volume_key, klen);
+
+ volume->key = key;
+ volume->key_hash = fscache_hash(0, (unsigned int *)key,
+ hlen / sizeof(unsigned int));
+
+ volume->debug_id = atomic_inc_return(&fscache_volume_debug_id);
+ down_write(&fscache_addremove_sem);
+ atomic_inc(&cache->n_volumes);
+ list_add_tail(&volume->proc_link, &fscache_volumes);
+ fscache_see_volume(volume, fscache_volume_new_acquire);
+ fscache_stat(&fscache_n_volumes);
+ up_write(&fscache_addremove_sem);
+ _leave(" = v=%x", volume->debug_id);
+ return volume;
+
+err_vol:
+ kfree(volume);
+err_cache:
+ fscache_put_cache(cache, fscache_cache_put_alloc_volume);
+ fscache_stat(&fscache_n_volumes_nomem);
+ return NULL;
+}
+
+/*
+ * Acquire a volume representation cookie and link it to a (proposed) cache.
+ */
+struct fscache_volume *__fscache_acquire_volume(const char *volume_key,
+ const char *cache_name,
+ u64 coherency_data)
+{
+ struct fscache_volume *volume;
+
+ volume = fscache_alloc_volume(volume_key, cache_name, coherency_data);
+ if (!volume)
+ return NULL;
+
+ if (!fscache_hash_volume(volume)) {
+ fscache_put_volume(volume, fscache_volume_put_hash_collision);
+ return NULL;
+ }
+
+ // PLACEHOLDER: Create the volume if we have a cache available
+ return volume;
+}
+EXPORT_SYMBOL(__fscache_acquire_volume);
+
+static void fscache_wake_pending_volume(struct fscache_volume *volume,
+ struct hlist_bl_head *h)
+{
+ struct fscache_volume *cursor;
+ struct hlist_bl_node *p;
+
+ hlist_bl_for_each_entry(cursor, p, h, hash_link) {
+ if (fscache_compare_volume(cursor, volume) == 0) {
+ fscache_see_volume(cursor, fscache_volume_see_hash_wake);
+ clear_bit(FSCACHE_VOLUME_ACQUIRE_PENDING, &cursor->flags);
+ wake_up_bit(&cursor->flags, FSCACHE_VOLUME_ACQUIRE_PENDING);
+ return;
+ }
+ }
+}
+
+/*
+ * Remove a volume cookie from the hash table.
+ */
+static void fscache_unhash_volume(struct fscache_volume *volume)
+{
+ struct hlist_bl_head *h;
+ unsigned int bucket;
+
+ bucket = volume->key_hash & (ARRAY_SIZE(fscache_volume_hash) - 1);
+ h = &fscache_volume_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_del(&volume->hash_link);
+ if (test_bit(FSCACHE_VOLUME_COLLIDED_WITH, &volume->flags))
+ fscache_wake_pending_volume(volume, h);
+ hlist_bl_unlock(h);
+}
+
+/*
+ * Drop a cache's volume attachments.
+ */
+static void fscache_free_volume(struct fscache_volume *volume)
+{
+ struct fscache_cache *cache = volume->cache;
+
+ if (volume->cache_priv) {
+ // PLACEHOLDER: Detach any attached cache
+ }
+
+ down_write(&fscache_addremove_sem);
+ list_del_init(&volume->proc_link);
+ atomic_dec(&volume->cache->n_volumes);
+ up_write(&fscache_addremove_sem);
+
+ if (!hlist_bl_unhashed(&volume->hash_link))
+ fscache_unhash_volume(volume);
+
+ trace_fscache_volume(volume->debug_id, 0, fscache_volume_free);
+ kfree(volume->key);
+ kfree(volume);
+ fscache_stat_d(&fscache_n_volumes);
+ fscache_put_cache(cache, fscache_cache_put_volume);
+}
+
+/*
+ * Drop a reference to a volume cookie.
+ */
+void fscache_put_volume(struct fscache_volume *volume,
+ enum fscache_volume_trace where)
+{
+ if (volume) {
+ unsigned int debug_id = volume->debug_id;
+ bool zero;
+ int ref;
+
+ zero = __refcount_dec_and_test(&volume->ref, &ref);
+ trace_fscache_volume(debug_id, ref - 1, where);
+ if (zero)
+ fscache_free_volume(volume);
+ }
+}
+
+/*
+ * Relinquish a volume representation cookie.
+ */
+void __fscache_relinquish_volume(struct fscache_volume *volume,
+ u64 coherency_data,
+ bool invalidate)
+{
+ if (WARN_ON(test_and_set_bit(FSCACHE_VOLUME_RELINQUISHED, &volume->flags)))
+ return;
+
+ if (invalidate)
+ set_bit(FSCACHE_VOLUME_INVALIDATE, &volume->flags);
+
+ fscache_put_volume(volume, fscache_volume_put_relinquish);
+}
+EXPORT_SYMBOL(__fscache_relinquish_volume);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * Generate a list of volumes in /proc/fs/fscache/volumes
+ */
+static int fscache_volumes_seq_show(struct seq_file *m, void *v)
+{
+ struct fscache_volume *volume;
+
+ if (v == &fscache_volumes) {
+ seq_puts(m,
+ "VOLUME REF nCOOK ACC FL CACHE KEY\n"
+ "======== ===== ===== === == =============== ================\n");
+ return 0;
+ }
+
+ volume = list_entry(v, struct fscache_volume, proc_link);
+ seq_printf(m,
+ "%08x %5d %5d %3d %02lx %-15.15s %s\n",
+ volume->debug_id,
+ refcount_read(&volume->ref),
+ atomic_read(&volume->n_cookies),
+ atomic_read(&volume->n_accesses),
+ volume->flags,
+ volume->cache->name ?: "-",
+ volume->key + 1);
+ return 0;
+}
+
+static void *fscache_volumes_seq_start(struct seq_file *m, loff_t *_pos)
+ __acquires(&fscache_addremove_sem)
+{
+ down_read(&fscache_addremove_sem);
+ return seq_list_start_head(&fscache_volumes, *_pos);
+}
+
+static void *fscache_volumes_seq_next(struct seq_file *m, void *v, loff_t *_pos)
+{
+ return seq_list_next(v, &fscache_volumes, _pos);
+}
+
+static void fscache_volumes_seq_stop(struct seq_file *m, void *v)
+ __releases(&fscache_addremove_sem)
+{
+ up_read(&fscache_addremove_sem);
+}
+
+const struct seq_operations fscache_volumes_seq_ops = {
+ .start = fscache_volumes_seq_start,
+ .next = fscache_volumes_seq_next,
+ .stop = fscache_volumes_seq_stop,
+ .show = fscache_volumes_seq_show,
+};
+#endif /* CONFIG_PROC_FS */
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 18c5336e41a5..d1ad94e936fc 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -25,9 +25,86 @@
#if defined(CONFIG_FSCACHE) || defined(CONFIG_FSCACHE_MODULE)
#define __fscache_available (1)
#define fscache_available() (1)
+#define fscache_volume_valid(volume) (volume)
#else
#define __fscache_available (0)
#define fscache_available() (0)
+#define fscache_volume_valid(volume) (0)
#endif
+/*
+ * Volume representation cookie.
+ */
+struct fscache_volume {
+ refcount_t ref;
+ atomic_t n_cookies; /* Number of data cookies in volume */
+ atomic_t n_accesses; /* Number of cache accesses in progress */
+ unsigned int debug_id;
+ unsigned int key_hash; /* Hash of key string */
+ char *key; /* Volume ID, eg. "afs@example.com@1234" */
+ struct list_head proc_link; /* Link in /proc/fs/fscache/volumes */
+ struct hlist_bl_node hash_link; /* Link in hash table */
+ struct work_struct work;
+ struct fscache_cache *cache; /* The cache in which this resides */
+ void *cache_priv; /* Cache private data */
+ u64 coherency; /* Coherency data */
+ spinlock_t lock;
+ unsigned long flags;
+#define FSCACHE_VOLUME_RELINQUISHED 0 /* Volume is being cleaned up */
+#define FSCACHE_VOLUME_INVALIDATE 1 /* Volume was invalidated */
+#define FSCACHE_VOLUME_COLLIDED_WITH 2 /* Volume was collided with */
+#define FSCACHE_VOLUME_ACQUIRE_PENDING 3 /* Volume is waiting to complete acquisition */
+#define FSCACHE_VOLUME_CREATING 4 /* Volume is being created on disk */
+};
+
+/*
+ * slow-path functions for when there is actually caching available, and the
+ * netfs does actually have a valid token
+ * - these are not to be called directly
+ * - these are undefined symbols when FS-Cache is not configured and the
+ * optimiser takes care of not using them
+ */
+extern struct fscache_volume *__fscache_acquire_volume(const char *, const char *, u64);
+extern void __fscache_relinquish_volume(struct fscache_volume *, u64, bool);
+
+/**
+ * fscache_acquire_volume - Register a volume as desiring caching services
+ * @volume_key: An identification string for the volume
+ * @cache_name: The name of the cache to use (or NULL for the default)
+ * @coherency_data: Piece of arbitrary coherency data to check
+ *
+ * Register a volume as desiring caching services if they're available. The
+ * caller must provide an identifier for the volume and may also indicate which
+ * cache it should be in. If a preexisting volume entry is found in the cache,
+ * the coherency data must match otherwise the entry will be invalidated.
+ */
+static inline
+struct fscache_volume *fscache_acquire_volume(const char *volume_key,
+ const char *cache_name,
+ u64 coherency_data)
+{
+ if (!fscache_available())
+ return NULL;
+ return __fscache_acquire_volume(volume_key, cache_name, coherency_data);
+}
+
+/**
+ * fscache_relinquish_volume - Cease caching a volume
+ * @volume: The volume cookie
+ * @coherency_data: Piece of arbitrary coherency data to set
+ * @invalidate: True if the volume should be invalidated
+ *
+ * Indicate that a filesystem no longer desires caching services for a volume.
+ * The caller must have relinquished all file cookies prior to calling this.
+ * The coherency data stored is updated.
+ */
+static inline
+void fscache_relinquish_volume(struct fscache_volume *volume,
+ u64 coherency_data,
+ bool invalidate)
+{
+ if (fscache_volume_valid(volume))
+ __fscache_relinquish_volume(volume, coherency_data, invalidate);
+}
+
#endif /* _LINUX_FSCACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 3263cbf32961..420fd02264f2 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -23,6 +23,23 @@ enum fscache_cache_trace {
fscache_cache_collision,
fscache_cache_get_acquire,
fscache_cache_new_acquire,
+ fscache_cache_put_alloc_volume,
+ fscache_cache_put_volume,
+};
+
+enum fscache_volume_trace {
+ fscache_volume_collision,
+ fscache_volume_get_cookie,
+ fscache_volume_get_create_work,
+ fscache_volume_get_hash_collision,
+ fscache_volume_free,
+ fscache_volume_new_acquire,
+ fscache_volume_put_cookie,
+ fscache_volume_put_create_work,
+ fscache_volume_put_hash_collision,
+ fscache_volume_put_relinquish,
+ fscache_volume_see_create_work,
+ fscache_volume_see_hash_wake,
};
#endif
@@ -33,7 +50,23 @@ enum fscache_cache_trace {
#define fscache_cache_traces \
EM(fscache_cache_collision, "*COLLIDE*") \
EM(fscache_cache_get_acquire, "GET acq ") \
- E_(fscache_cache_new_acquire, "NEW acq ")
+ EM(fscache_cache_new_acquire, "NEW acq ") \
+ EM(fscache_cache_put_alloc_volume, "PUT alvol") \
+ E_(fscache_cache_put_volume, "PUT vol ")
+
+#define fscache_volume_traces \
+ EM(fscache_volume_collision, "*COLLIDE*") \
+ EM(fscache_volume_get_cookie, "GET cook ") \
+ EM(fscache_volume_get_create_work, "GET creat") \
+ EM(fscache_volume_get_hash_collision, "GET hcoll") \
+ EM(fscache_volume_free, "FREE ") \
+ EM(fscache_volume_new_acquire, "NEW acq ") \
+ EM(fscache_volume_put_cookie, "PUT cook ") \
+ EM(fscache_volume_put_create_work, "PUT creat") \
+ EM(fscache_volume_put_hash_collision, "PUT hcoll") \
+ EM(fscache_volume_put_relinquish, "PUT relnq") \
+ EM(fscache_volume_see_create_work, "SEE creat") \
+ E_(fscache_volume_see_hash_wake, "SEE hwake")
/*
* Export enum symbols via userspace.
@@ -44,6 +77,7 @@ enum fscache_cache_trace {
#define E_(a, b) TRACE_DEFINE_ENUM(a);
fscache_cache_traces;
+fscache_volume_traces;
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
@@ -80,6 +114,31 @@ TRACE_EVENT(fscache_cache,
__entry->usage)
);
+TRACE_EVENT(fscache_volume,
+ TP_PROTO(unsigned int volume_debug_id,
+ int usage,
+ enum fscache_volume_trace where),
+
+ TP_ARGS(volume_debug_id, usage, where),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, volume )
+ __field(int, usage )
+ __field(enum fscache_volume_trace, where )
+ ),
+
+ TP_fast_assign(
+ __entry->volume = volume_debug_id;
+ __entry->usage = usage;
+ __entry->where = where;
+ ),
+
+ TP_printk("V=%08x %s u=%d",
+ __entry->volume,
+ __print_symbolic(__entry->where, fscache_volume_traces),
+ __entry->usage)
+ );
+
#endif /* _TRACE_FSCACHE_H */
/* This part must be outside protection */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 11/53] fscache: Implement cookie registration
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (9 preceding siblings ...)
2021-10-22 19:01 ` [PATCH v2 10/53] fscache: Implement volume registration David Howells
@ 2021-10-22 19:01 ` David Howells
2021-10-22 19:02 ` [PATCH v2 12/53] fscache: Implement cache-level access helpers David Howells
` (43 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:01 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add functions to the fscache API to allow data file cookies to be acquired
and relinquished by the network filesystem. It is intended that the
filesystem will create such cookies per-inode under a volume.
To request a cookie, it uses:
struct fscache_cookie *
fscache_acquire_cookie(struct fscache_volume *volume,
u8 advice,
const void *index_key,
size_t index_key_len,
const void *aux_data,
size_t aux_data_len,
loff_t object_size)
The filesystem must first create a volume cookie, which is passed in here.
If it passes in NULL then the function will do nothing other than just
return a NULL cookie.
A binary key should be passed in index_key and is of size index_key_len.
This is saved in the cookie and is used to locate the associated data in
the cache.
A coherency data buffer of size aux_data_len will be allocated and
initialised from the buffer pointed to by aux_data. This is used to
validate cache objects when they're opened and is stored on disk with them
when they're committed. The data is stored in the cookie and will be
updateable by various functions in later patches.
The object_size must also be given. This is also used to perform a
coherency check and to size the backing storage appropriately.
This function disallows a cookie from being acquired twice in parallel,
though it will cause the second user to wait if the first is busy
relinquishing its cookie.
When a network filesystem has finished with a cookie, it should call:
void
fscache_relinquish_cookie(struct fscache_volume *volume,
bool retire)
If retire is true, any backing data will be discarded immediately.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/Makefile | 1
fs/fscache/cookie.c | 491 ++++++++++++++++++++++++++++++++++++++++
fs/fscache/internal.h | 25 ++
fs/fscache/main.c | 12 +
fs/fscache/proc.c | 4
fs/fscache/stats.c | 32 +++
include/linux/fscache-cache.h | 19 ++
include/linux/fscache.h | 136 +++++++++++
include/trace/events/fscache.h | 112 +++++++++
9 files changed, 831 insertions(+), 1 deletion(-)
create mode 100644 fs/fscache/cookie.c
diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile
index bb5282ae682f..bcc79615f93a 100644
--- a/fs/fscache/Makefile
+++ b/fs/fscache/Makefile
@@ -5,6 +5,7 @@
fscache-y := \
cache.o \
+ cookie.o \
main.o \
volume.o
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
new file mode 100644
index 000000000000..87ee8b666765
--- /dev/null
+++ b/fs/fscache/cookie.c
@@ -0,0 +1,491 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* netfs cookie management
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for more information on
+ * the netfs API.
+ */
+
+#define FSCACHE_DEBUG_LEVEL COOKIE
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+struct kmem_cache *fscache_cookie_jar;
+
+static void fscache_drop_cookie(struct fscache_cookie *cookie);
+
+#define fscache_cookie_hash_shift 15
+static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift];
+static LIST_HEAD(fscache_cookies);
+static DEFINE_RWLOCK(fscache_cookies_lock);
+static const char fscache_cookie_stages[FSCACHE_COOKIE_STAGE__NR] = "-LCAFWRD";
+
+void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
+{
+ const u8 *k;
+
+ pr_err("%c-cookie c=%08x [fl=%lx na=%u nA=%u s=%c]\n",
+ prefix,
+ cookie->debug_id,
+ cookie->flags,
+ atomic_read(&cookie->n_active),
+ atomic_read(&cookie->n_accesses),
+ fscache_cookie_stages[cookie->stage]);
+ pr_err("%c-cookie V=%08x [%s]\n",
+ prefix,
+ cookie->volume->debug_id,
+ cookie->volume->key);
+
+ k = (cookie->key_len <= sizeof(cookie->inline_key)) ?
+ cookie->inline_key : cookie->key;
+ pr_err("%c-key=[%u] '%*phN'\n", prefix, cookie->key_len, cookie->key_len, k);
+}
+
+static void fscache_free_cookie(struct fscache_cookie *cookie)
+{
+ write_lock(&fscache_cookies_lock);
+ list_del(&cookie->proc_link);
+ write_unlock(&fscache_cookies_lock);
+ if (cookie->aux_len > sizeof(cookie->inline_aux))
+ kfree(cookie->aux);
+ if (cookie->key_len > sizeof(cookie->inline_key))
+ kfree(cookie->key);
+ fscache_stat_d(&fscache_n_cookies);
+ kmem_cache_free(fscache_cookie_jar, cookie);
+}
+
+static inline void wake_up_cookie_stage(struct fscache_cookie *cookie)
+{
+ /* Use a barrier to ensure that waiters see the stage variable
+ * change, as spin_unlock doesn't guarantee a barrier.
+ *
+ * See comments over wake_up_bit() and waitqueue_active().
+ */
+ smp_mb();
+ wake_up_var(&cookie->stage);
+}
+
+static void __fscache_set_cookie_stage(struct fscache_cookie *cookie,
+ enum fscache_cookie_stage stage)
+{
+ cookie->stage = stage;
+}
+
+/*
+ * Change the stage a cookie is at and wake up anyone waiting for that - but
+ * only if the cookie isn't already marked as being in a cleanup state.
+ */
+void fscache_set_cookie_stage(struct fscache_cookie *cookie,
+ enum fscache_cookie_stage stage)
+{
+ bool changed = false;
+
+ spin_lock(&cookie->lock);
+ switch (cookie->stage) {
+ case FSCACHE_COOKIE_STAGE_RELINQUISHING:
+ break;
+ default:
+ __fscache_set_cookie_stage(cookie, stage);
+ changed = true;
+ break;
+ }
+ spin_unlock(&cookie->lock);
+ if (changed)
+ wake_up_cookie_stage(cookie);
+}
+EXPORT_SYMBOL(fscache_set_cookie_stage);
+
+/*
+ * Set the index key in a cookie. The cookie struct has space for a 16-byte
+ * key plus length and hash, but if that's not big enough, it's instead a
+ * pointer to a buffer containing 3 bytes of hash, 1 byte of length and then
+ * the key data.
+ */
+static int fscache_set_key(struct fscache_cookie *cookie,
+ const void *index_key, size_t index_key_len)
+{
+ u32 *buf;
+ int bufs;
+
+ bufs = DIV_ROUND_UP(index_key_len, sizeof(*buf));
+
+ if (index_key_len > sizeof(cookie->inline_key)) {
+ buf = kcalloc(bufs, sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ cookie->key = buf;
+ } else {
+ buf = (u32 *)cookie->inline_key;
+ }
+
+ memcpy(buf, index_key, index_key_len);
+ cookie->key_hash = fscache_hash(cookie->volume->key_hash, buf, bufs);
+ return 0;
+}
+
+static long fscache_compare_cookie(const struct fscache_cookie *a,
+ const struct fscache_cookie *b)
+{
+ const void *ka, *kb;
+
+ if (a->key_hash != b->key_hash)
+ return (long)a->key_hash - (long)b->key_hash;
+ if (a->volume != b->volume)
+ return (long)a->volume - (long)b->volume;
+ if (a->key_len != b->key_len)
+ return (long)a->key_len - (long)b->key_len;
+
+ if (a->key_len <= sizeof(a->inline_key)) {
+ ka = &a->inline_key;
+ kb = &b->inline_key;
+ } else {
+ ka = a->key;
+ kb = b->key;
+ }
+ return memcmp(ka, kb, a->key_len);
+}
+
+static atomic_t fscache_cookie_debug_id = ATOMIC_INIT(1);
+
+/*
+ * Allocate a cookie.
+ */
+static struct fscache_cookie *fscache_alloc_cookie(
+ struct fscache_volume *volume,
+ u8 advice,
+ const void *index_key, size_t index_key_len,
+ const void *aux_data, size_t aux_data_len,
+ loff_t object_size)
+{
+ struct fscache_cookie *cookie;
+
+ /* allocate and initialise a cookie */
+ cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);
+ if (!cookie)
+ return NULL;
+ fscache_stat(&fscache_n_cookies);
+
+ cookie->volume = volume;
+ cookie->advice = advice;
+ cookie->key_len = index_key_len;
+ cookie->aux_len = aux_data_len;
+ cookie->object_size = object_size;
+ if (object_size == 0)
+ __set_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags);
+
+ if (fscache_set_key(cookie, index_key, index_key_len) < 0)
+ goto nomem;
+
+ if (cookie->aux_len <= sizeof(cookie->inline_aux)) {
+ memcpy(cookie->inline_aux, aux_data, cookie->aux_len);
+ } else {
+ cookie->aux = kmemdup(aux_data, cookie->aux_len, GFP_KERNEL);
+ if (!cookie->aux)
+ goto nomem;
+ }
+
+ refcount_set(&cookie->ref, 1);
+ cookie->debug_id = atomic_inc_return(&fscache_cookie_debug_id);
+ cookie->stage = FSCACHE_COOKIE_STAGE_QUIESCENT;
+ spin_lock_init(&cookie->lock);
+ INIT_LIST_HEAD(&cookie->commit_link);
+ INIT_WORK(&cookie->work, NULL /* PLACEHOLDER */);
+
+ write_lock(&fscache_cookies_lock);
+ list_add_tail(&cookie->proc_link, &fscache_cookies);
+ write_unlock(&fscache_cookies_lock);
+ fscache_see_cookie(cookie, fscache_cookie_new_acquire);
+ return cookie;
+
+nomem:
+ fscache_free_cookie(cookie);
+ return NULL;
+}
+
+static void fscache_wait_on_collision(struct fscache_cookie *candidate,
+ struct fscache_cookie *wait_for)
+{
+ enum fscache_cookie_stage *stagep = &wait_for->stage;
+
+ wait_var_event_timeout(stagep, READ_ONCE(*stagep) == FSCACHE_COOKIE_STAGE_DROPPED,
+ 20 * HZ);
+ if (READ_ONCE(*stagep) != FSCACHE_COOKIE_STAGE_DROPPED) {
+ pr_notice("Potential collision c=%08x old: c=%08x",
+ candidate->debug_id, wait_for->debug_id);
+ wait_var_event(stagep, READ_ONCE(*stagep) == FSCACHE_COOKIE_STAGE_DROPPED);
+ }
+}
+
+/*
+ * Attempt to insert the new cookie into the hash. If there's a collision, we
+ * wait for the old cookie to complete if it's being relinquished and an error
+ * otherwise.
+ */
+static bool fscache_hash_cookie(struct fscache_cookie *candidate)
+{
+ struct fscache_cookie *cursor, *wait_for = NULL;
+ struct hlist_bl_head *h;
+ struct hlist_bl_node *p;
+ unsigned int bucket;
+
+ bucket = candidate->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
+ h = &fscache_cookie_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_for_each_entry(cursor, p, h, hash_link) {
+ if (fscache_compare_cookie(candidate, cursor) == 0) {
+ if (!test_bit(FSCACHE_COOKIE_RELINQUISHED, &cursor->flags))
+ goto collision;
+ wait_for = fscache_get_cookie(cursor,
+ fscache_cookie_get_hash_collision);
+ break;
+ }
+ }
+
+ fscache_get_volume(candidate->volume, fscache_volume_get_cookie);
+ atomic_inc(&candidate->volume->n_cookies);
+ hlist_bl_add_head(&candidate->hash_link, h);
+ hlist_bl_unlock(h);
+
+ if (wait_for) {
+ fscache_wait_on_collision(candidate, wait_for);
+ fscache_put_cookie(wait_for, fscache_cookie_put_hash_collision);
+ }
+ return true;
+
+collision:
+ trace_fscache_cookie(cursor->debug_id, refcount_read(&cursor->ref),
+ fscache_cookie_collision);
+ pr_err("Duplicate cookie detected\n");
+ fscache_print_cookie(cursor, 'O');
+ fscache_print_cookie(candidate, 'N');
+ hlist_bl_unlock(h);
+ return false;
+}
+
+/*
+ * Request a cookie to represent a data storage object within a volume.
+ *
+ * We never let on to the netfs about errors. We may set a negative cookie
+ * pointer, but that's okay
+ */
+struct fscache_cookie *__fscache_acquire_cookie(
+ struct fscache_volume *volume,
+ u8 advice,
+ const void *index_key, size_t index_key_len,
+ const void *aux_data, size_t aux_data_len,
+ loff_t object_size)
+{
+ struct fscache_cookie *cookie;
+
+ _enter("V=%x", volume->debug_id);
+
+ if (!index_key || !index_key_len || index_key_len > 255 || aux_data_len > 255)
+ return NULL;
+ if (!aux_data || !aux_data_len) {
+ aux_data = NULL;
+ aux_data_len = 0;
+ }
+
+ fscache_stat(&fscache_n_acquires);
+
+ cookie = fscache_alloc_cookie(volume, advice,
+ index_key, index_key_len,
+ aux_data, aux_data_len,
+ object_size);
+ if (!cookie) {
+ fscache_stat(&fscache_n_acquires_oom);
+ return NULL;
+ }
+
+ if (!fscache_hash_cookie(cookie)) {
+ fscache_see_cookie(cookie, fscache_cookie_discard);
+ fscache_free_cookie(cookie);
+ return NULL;
+ }
+
+ trace_fscache_acquire(cookie);
+ fscache_stat(&fscache_n_acquires_ok);
+ _leave(" = c=%08x", cookie->debug_id);
+ return cookie;
+}
+EXPORT_SYMBOL(__fscache_acquire_cookie);
+
+/*
+ * Remove a cookie from the hash table.
+ */
+static void fscache_unhash_cookie(struct fscache_cookie *cookie)
+{
+ struct hlist_bl_head *h;
+ unsigned int bucket;
+
+ bucket = cookie->key_hash & (ARRAY_SIZE(fscache_cookie_hash) - 1);
+ h = &fscache_cookie_hash[bucket];
+
+ hlist_bl_lock(h);
+ hlist_bl_del(&cookie->hash_link);
+ hlist_bl_unlock(h);
+}
+
+/*
+ * Finalise a cookie after all its resources have been disposed of.
+ */
+static void fscache_drop_cookie(struct fscache_cookie *cookie)
+{
+ spin_lock(&cookie->lock);
+ __fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_DROPPED);
+ spin_unlock(&cookie->lock);
+ wake_up_cookie_stage(cookie);
+
+ fscache_unhash_cookie(cookie);
+ fscache_stat(&fscache_n_relinquishes_dropped);
+}
+
+/*
+ * Allow the netfs to release a cookie back to the cache.
+ * - the object will be marked as recyclable on disk if retire is true
+ */
+void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
+{
+ fscache_stat(&fscache_n_relinquishes);
+ if (retire)
+ fscache_stat(&fscache_n_relinquishes_retire);
+
+ _enter("c=%08x{%d},%d",
+ cookie->debug_id, atomic_read(&cookie->n_active), retire);
+
+ if (WARN(test_and_set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags),
+ "Cookie c=%x already relinquished\n", cookie->debug_id))
+ return;
+
+ if (retire)
+ set_bit(FSCACHE_COOKIE_RETIRED, &cookie->flags);
+ trace_fscache_relinquish(cookie, retire);
+
+ ASSERTCMP(atomic_read(&cookie->n_active), ==, 0);
+ ASSERTCMP(atomic_read(&cookie->volume->n_cookies), >, 0);
+ atomic_dec(&cookie->volume->n_cookies);
+
+ set_bit(FSCACHE_COOKIE_DO_RELINQUISH, &cookie->flags);
+
+ if (test_bit(FSCACHE_COOKIE_HAS_BEEN_CACHED, &cookie->flags))
+ ; // PLACEHOLDER: Do something here if the cookie was cached
+ else
+ fscache_drop_cookie(cookie);
+ fscache_put_cookie(cookie, fscache_cookie_put_relinquish);
+}
+EXPORT_SYMBOL(__fscache_relinquish_cookie);
+
+/*
+ * Drop a reference to a cookie.
+ */
+void fscache_put_cookie(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
+{
+ struct fscache_volume *volume = cookie->volume;
+ unsigned int cookie_debug_id = cookie->debug_id;
+ bool zero;
+ int ref;
+
+ zero = __refcount_dec_and_test(&cookie->ref, &ref);
+ trace_fscache_cookie(cookie_debug_id, ref - 1, where);
+ if (zero) {
+ fscache_free_cookie(cookie);
+ fscache_put_volume(volume, fscache_volume_put_cookie);
+ }
+}
+EXPORT_SYMBOL(fscache_put_cookie);
+
+/*
+ * Get a reference to a cookie.
+ */
+struct fscache_cookie *fscache_get_cookie(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
+{
+ int ref;
+
+ __refcount_inc(&cookie->ref, &ref);
+ trace_fscache_cookie(cookie->debug_id, ref + 1, where);
+ return cookie;
+}
+EXPORT_SYMBOL(fscache_get_cookie);
+
+/*
+ * Generate a list of extant cookies in /proc/fs/fscache/cookies
+ */
+static int fscache_cookies_seq_show(struct seq_file *m, void *v)
+{
+ struct fscache_cookie *cookie;
+ unsigned int keylen = 0, auxlen = 0;
+ u8 *p;
+
+ if (v == &fscache_cookies) {
+ seq_puts(m,
+ "COOKIE VOLUME REF ACT ACC S FL DEF \n"
+ "======== ======== === === === = == ================\n"
+ );
+ return 0;
+ }
+
+ cookie = list_entry(v, struct fscache_cookie, proc_link);
+
+ seq_printf(m,
+ "%08x %08x %3d %3d %3d %c %02lx",
+ cookie->debug_id,
+ cookie->volume->debug_id,
+ refcount_read(&cookie->ref),
+ atomic_read(&cookie->n_active),
+ atomic_read(&cookie->n_accesses) - 1,
+ fscache_cookie_stages[cookie->stage],
+ cookie->flags);
+
+ keylen = cookie->key_len;
+ auxlen = cookie->aux_len;
+
+ if (keylen > 0 || auxlen > 0) {
+ seq_puts(m, " ");
+ p = keylen <= sizeof(cookie->inline_key) ?
+ cookie->inline_key : cookie->key;
+ for (; keylen > 0; keylen--)
+ seq_printf(m, "%02x", *p++);
+ if (auxlen > 0) {
+ seq_puts(m, ", ");
+ p = auxlen <= sizeof(cookie->inline_aux) ?
+ cookie->inline_aux : cookie->aux;
+ for (; auxlen > 0; auxlen--)
+ seq_printf(m, "%02x", *p++);
+ }
+ }
+
+ seq_puts(m, "\n");
+ return 0;
+}
+
+static void *fscache_cookies_seq_start(struct seq_file *m, loff_t *_pos)
+ __acquires(fscache_cookies_lock)
+{
+ read_lock(&fscache_cookies_lock);
+ return seq_list_start_head(&fscache_cookies, *_pos);
+}
+
+static void *fscache_cookies_seq_next(struct seq_file *m, void *v, loff_t *_pos)
+{
+ return seq_list_next(v, &fscache_cookies, _pos);
+}
+
+static void fscache_cookies_seq_stop(struct seq_file *m, void *v)
+ __releases(rcu)
+{
+ read_unlock(&fscache_cookies_lock);
+}
+
+
+const struct seq_operations fscache_cookies_seq_ops = {
+ .start = fscache_cookies_seq_start,
+ .next = fscache_cookies_seq_next,
+ .stop = fscache_cookies_seq_stop,
+ .show = fscache_cookies_seq_show,
+};
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 18c099363b62..9daacd7de9ea 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -25,6 +25,20 @@ extern const struct seq_operations fscache_caches_seq_ops;
#endif
struct fscache_cache *fscache_lookup_cache(const char *name, bool is_cache);
+/*
+ * cookie.c
+ */
+extern struct kmem_cache *fscache_cookie_jar;
+extern const struct seq_operations fscache_cookies_seq_ops;
+
+extern void fscache_print_cookie(struct fscache_cookie *cookie, char prefix);
+static inline void fscache_see_cookie(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
+{
+ trace_fscache_cookie(cookie->debug_id, refcount_read(&cookie->ref),
+ where);
+}
+
/*
* main.c
*/
@@ -50,6 +64,17 @@ extern void fscache_proc_cleanup(void);
extern atomic_t fscache_n_volumes;
extern atomic_t fscache_n_volumes_collision;
extern atomic_t fscache_n_volumes_nomem;
+extern atomic_t fscache_n_cookies;
+
+extern atomic_t fscache_n_acquires;
+extern atomic_t fscache_n_acquires_null;
+extern atomic_t fscache_n_acquires_no_cache;
+extern atomic_t fscache_n_acquires_ok;
+extern atomic_t fscache_n_acquires_oom;
+
+extern atomic_t fscache_n_relinquishes;
+extern atomic_t fscache_n_relinquishes_retire;
+extern atomic_t fscache_n_relinquishes_dropped;
static inline void fscache_stat(atomic_t *stat)
{
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index a4afba1b9d3b..fad9c1933987 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -78,9 +78,20 @@ static int __init fscache_init(void)
if (ret < 0)
goto error_proc;
+ fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar",
+ sizeof(struct fscache_cookie),
+ 0, 0, NULL);
+ if (!fscache_cookie_jar) {
+ pr_notice("Failed to allocate a cookie jar\n");
+ ret = -ENOMEM;
+ goto error_cookie_jar;
+ }
+
pr_notice("Loaded\n");
return 0;
+error_cookie_jar:
+ fscache_proc_cleanup();
error_proc:
destroy_workqueue(fscache_wq);
error_wq:
@@ -96,6 +107,7 @@ static void __exit fscache_exit(void)
{
_enter("");
+ kmem_cache_destroy(fscache_cookie_jar);
fscache_proc_cleanup();
destroy_workqueue(fscache_wq);
pr_notice("Unloaded\n");
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
index c6970d4a44f1..9d31daae947b 100644
--- a/fs/fscache/proc.c
+++ b/fs/fscache/proc.c
@@ -27,6 +27,10 @@ int __init fscache_proc_init(void)
&fscache_volumes_seq_ops))
goto error;
+ if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
+ &fscache_cookies_seq_ops))
+ goto error;
+
#ifdef CONFIG_FSCACHE_STATS
if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
fscache_stats_show))
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index b811a4d03585..fd2bd08c1ecb 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -16,6 +16,20 @@
atomic_t fscache_n_volumes;
atomic_t fscache_n_volumes_collision;
atomic_t fscache_n_volumes_nomem;
+atomic_t fscache_n_cookies;
+
+atomic_t fscache_n_acquires;
+atomic_t fscache_n_acquires_null;
+atomic_t fscache_n_acquires_no_cache;
+atomic_t fscache_n_acquires_ok;
+atomic_t fscache_n_acquires_oom;
+
+atomic_t fscache_n_updates;
+EXPORT_SYMBOL(fscache_n_updates);
+
+atomic_t fscache_n_relinquishes;
+atomic_t fscache_n_relinquishes_retire;
+atomic_t fscache_n_relinquishes_dropped;
/*
* display the general statistics
@@ -23,12 +37,28 @@ atomic_t fscache_n_volumes_nomem;
int fscache_stats_show(struct seq_file *m, void *v)
{
seq_puts(m, "FS-Cache statistics\n");
- seq_printf(m, "Cookies: v=%d vcol=%u voom=%u\n",
+ seq_printf(m, "Cookies: n=%d v=%d vcol=%u voom=%u\n",
+ atomic_read(&fscache_n_cookies),
atomic_read(&fscache_n_volumes),
atomic_read(&fscache_n_volumes_collision),
atomic_read(&fscache_n_volumes_nomem)
);
+ seq_printf(m, "Acquire: n=%u nul=%u noc=%u ok=%u oom=%u\n",
+ atomic_read(&fscache_n_acquires),
+ atomic_read(&fscache_n_acquires_null),
+ atomic_read(&fscache_n_acquires_no_cache),
+ atomic_read(&fscache_n_acquires_ok),
+ atomic_read(&fscache_n_acquires_oom));
+
+ seq_printf(m, "Updates: n=%u\n",
+ atomic_read(&fscache_n_updates));
+
+ seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
+ atomic_read(&fscache_n_relinquishes),
+ atomic_read(&fscache_n_relinquishes_retire),
+ atomic_read(&fscache_n_relinquishes_dropped));
+
netfs_stats_show(m);
return 0;
}
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index f6429e5ba6e7..e075cca1a30d 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -18,6 +18,7 @@
struct fscache_cache;
enum fscache_cache_trace;
+enum fscache_cookie_trace;
enum fscache_access_trace;
enum fscache_cache_state {
@@ -76,6 +77,24 @@ extern struct fscache_cache *fscache_acquire_cache(const char *name);
extern void fscache_put_cache(struct fscache_cache *cache,
enum fscache_cache_trace where);
+extern struct fscache_cookie *fscache_get_cookie(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where);
+extern void fscache_put_cookie(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where);
+extern void fscache_set_cookie_stage(struct fscache_cookie *cookie,
+ enum fscache_cookie_stage stage);
+
+/*
+ * Find the key on a cookie.
+ */
+static inline void *fscache_get_key(struct fscache_cookie *cookie)
+{
+ if (cookie->key_len <= sizeof(cookie->inline_key))
+ return cookie->inline_key;
+ else
+ return cookie->key;
+}
+
extern struct workqueue_struct *fscache_wq;
#endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index d1ad94e936fc..ebdc0fd1f309 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -26,12 +26,36 @@
#define __fscache_available (1)
#define fscache_available() (1)
#define fscache_volume_valid(volume) (volume)
+#define fscache_cookie_valid(cookie) (cookie)
#else
#define __fscache_available (0)
#define fscache_available() (0)
#define fscache_volume_valid(volume) (0)
+#define fscache_cookie_valid(cookie) (0)
#endif
+struct fscache_cookie;
+
+#define FSCACHE_ADV_SINGLE_CHUNK 0x01 /* The object is a single chunk of data */
+#define FSCACHE_ADV_WRITE_CACHE 0x00 /* Do cache if written to locally */
+#define FSCACHE_ADV_WRITE_NOCACHE 0x02 /* Don't cache if written to locally */
+#define FSCACHE_ADV_FALLBACK_IO 0x04 /* Going to use the fallback I/O API (dangerous) */
+
+/*
+ * Data object state.
+ */
+enum fscache_cookie_stage {
+ FSCACHE_COOKIE_STAGE_QUIESCENT, /* The cookie is uncached */
+ FSCACHE_COOKIE_STAGE_LOOKING_UP, /* The cache object is being looked up */
+ FSCACHE_COOKIE_STAGE_CREATING, /* The cache object is being created */
+ FSCACHE_COOKIE_STAGE_ACTIVE, /* The cache is active, readable and writable */
+ FSCACHE_COOKIE_STAGE_FAILED, /* The cache failed, withdraw to clear */
+ FSCACHE_COOKIE_STAGE_WITHDRAWING, /* The cookie is being withdrawn */
+ FSCACHE_COOKIE_STAGE_RELINQUISHING, /* The cookie is being relinquished */
+ FSCACHE_COOKIE_STAGE_DROPPED, /* The cookie has been dropped */
+#define FSCACHE_COOKIE_STAGE__NR (FSCACHE_COOKIE_STAGE_DROPPED + 1)
+} __attribute__((mode(byte)));
+
/*
* Volume representation cookie.
*/
@@ -57,6 +81,59 @@ struct fscache_volume {
#define FSCACHE_VOLUME_CREATING 4 /* Volume is being created on disk */
};
+/*
+ * Data file representation cookie.
+ * - a file will only appear in one cache
+ * - a request to cache a file may or may not be honoured, subject to
+ * constraints such as disk space
+ * - indices are created on disk just-in-time
+ */
+struct fscache_cookie {
+ refcount_t ref;
+ atomic_t n_active; /* number of active users of cookie */
+ atomic_t n_accesses; /* Number of cache accesses in progress */
+ unsigned int debug_id;
+ unsigned int inval_counter; /* Number of invalidations made */
+ spinlock_t lock;
+ struct fscache_volume *volume; /* Parent volume of this file. */
+ void *cache_priv; /* Cache-side representation */
+ struct hlist_bl_node hash_link; /* Link in hash table */
+ struct list_head proc_link; /* Link in proc list */
+ struct list_head commit_link; /* Link in commit queue */
+ struct work_struct work; /* Commit/relinq/withdraw work */
+ loff_t object_size; /* Size of the netfs object */
+ unsigned long unused_at; /* Time at which unused (jiffies) */
+ unsigned long flags;
+#define FSCACHE_COOKIE_RELINQUISHED 0 /* T if cookie has been relinquished */
+#define FSCACHE_COOKIE_RETIRED 1 /* T if this cookie has retired on relinq */
+#define FSCACHE_COOKIE_IS_CACHING 2 /* T if this cookie is cached */
+#define FSCACHE_COOKIE_NO_DATA_TO_READ 3 /* T if this cookie has nothing to read */
+#define FSCACHE_COOKIE_NEEDS_UPDATE 4 /* T if attrs have been updated */
+#define FSCACHE_COOKIE_HAS_BEEN_CACHED 5 /* T if cookie needs withdraw-on-relinq */
+#define FSCACHE_COOKIE_DISABLED 6 /* T if cookie has been disabled */
+#define FSCACHE_COOKIE_LOCAL_WRITE 7 /* T if cookie has been modified locally */
+#define FSCACHE_COOKIE_NACC_ELEVATED 8 /* T if n_accesses is incremented */
+#define FSCACHE_COOKIE_DO_RELINQUISH 9 /* T if this cookie needs relinquishment */
+#define FSCACHE_COOKIE_DO_WITHDRAW 10 /* T if this cookie needs withdrawing */
+#define FSCACHE_COOKIE_DO_COMMIT 11 /* T if this cookie needs committing */
+#define FSCACHE_COOKIE_DO_PREP_TO_WRITE 12 /* T if cookie needs write preparation */
+#define FSCACHE_COOKIE_HAVE_DATA 13 /* T if this cookie has data stored */
+
+ enum fscache_cookie_stage stage;
+ u8 advice; /* FSCACHE_ADV_* */
+ u8 key_len; /* Length of index key */
+ u8 aux_len; /* Length of auxiliary data */
+ u32 key_hash; /* Hash of volume, key, len */
+ union {
+ void *key; /* Index key */
+ u8 inline_key[16]; /* - If the key is short enough */
+ };
+ union {
+ void *aux; /* Auxiliary data */
+ u8 inline_aux[8]; /* - If the aux data is short enough */
+ };
+};
+
/*
* slow-path functions for when there is actually caching available, and the
* netfs does actually have a valid token
@@ -67,6 +144,14 @@ struct fscache_volume {
extern struct fscache_volume *__fscache_acquire_volume(const char *, const char *, u64);
extern void __fscache_relinquish_volume(struct fscache_volume *, u64, bool);
+extern struct fscache_cookie *__fscache_acquire_cookie(
+ struct fscache_volume *,
+ u8,
+ const void *, size_t,
+ const void *, size_t,
+ loff_t);
+extern void __fscache_relinquish_cookie(struct fscache_cookie *, bool);
+
/**
* fscache_acquire_volume - Register a volume as desiring caching services
* @volume_key: An identification string for the volume
@@ -107,4 +192,55 @@ void fscache_relinquish_volume(struct fscache_volume *volume,
__fscache_relinquish_volume(volume, coherency_data, invalidate);
}
+/**
+ * fscache_acquire_cookie - Acquire a cookie to represent a cache object
+ * @volume: The volume in which to locate/create this cookie
+ * @advice: Advice flags (FSCACHE_COOKIE_ADV_*)
+ * @index_key: The index key for this cookie
+ * @index_key_len: Size of the index key
+ * @aux_data: The auxiliary data for the cookie (may be NULL)
+ * @aux_data_len: Size of the auxiliary data buffer
+ * @object_size: The initial size of object
+ *
+ * Acquire a cookie to represent a data file within the given cache volume.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+struct fscache_cookie *fscache_acquire_cookie(struct fscache_volume *volume,
+ u8 advice,
+ const void *index_key,
+ size_t index_key_len,
+ const void *aux_data,
+ size_t aux_data_len,
+ loff_t object_size)
+{
+ if (!fscache_volume_valid(volume))
+ return NULL;
+ return __fscache_acquire_cookie(volume, advice,
+ index_key, index_key_len,
+ aux_data, aux_data_len,
+ object_size);
+}
+
+/**
+ * fscache_relinquish_cookie - Return the cookie to the cache, maybe discarding
+ * it
+ * @cookie: The cookie being returned
+ * @retire: True if the cache object the cookie represents is to be discarded
+ *
+ * This function returns a cookie to the cache, forcibly discarding the
+ * associated cache object if retire is set to true.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
+{
+ if (fscache_cookie_valid(cookie))
+ __fscache_relinquish_cookie(cookie, retire);
+}
+
#endif /* _LINUX_FSCACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 420fd02264f2..cfa4c153c72b 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -42,6 +42,23 @@ enum fscache_volume_trace {
fscache_volume_see_hash_wake,
};
+enum fscache_cookie_trace {
+ fscache_cookie_collision,
+ fscache_cookie_discard,
+ fscache_cookie_get_end_access,
+ fscache_cookie_get_hash_collision,
+ fscache_cookie_new_acquire,
+ fscache_cookie_put_hash_collision,
+ fscache_cookie_put_over_queued,
+ fscache_cookie_put_relinquish,
+ fscache_cookie_put_withdrawn,
+ fscache_cookie_put_work,
+ fscache_cookie_see_active,
+ fscache_cookie_see_relinquish,
+ fscache_cookie_see_withdraw,
+ fscache_cookie_see_work,
+};
+
#endif
/*
@@ -68,6 +85,22 @@ enum fscache_volume_trace {
EM(fscache_volume_see_create_work, "SEE creat") \
E_(fscache_volume_see_hash_wake, "SEE hwake")
+#define fscache_cookie_traces \
+ EM(fscache_cookie_collision, "*COLLIDE*") \
+ EM(fscache_cookie_discard, "DISCARD ") \
+ EM(fscache_cookie_get_hash_collision, "GET hcoll") \
+ EM(fscache_cookie_get_end_access, "GQ endac") \
+ EM(fscache_cookie_new_acquire, "NEW acq ") \
+ EM(fscache_cookie_put_hash_collision, "PUT hcoll") \
+ EM(fscache_cookie_put_over_queued, "PQ overq") \
+ EM(fscache_cookie_put_relinquish, "PUT relnq") \
+ EM(fscache_cookie_put_withdrawn, "PUT wthdn") \
+ EM(fscache_cookie_put_work, "PQ work ") \
+ EM(fscache_cookie_see_active, "- active") \
+ EM(fscache_cookie_see_relinquish, "- x-rlq") \
+ EM(fscache_cookie_see_withdraw, "- x-wth") \
+ E_(fscache_cookie_see_work, "- work ")
+
/*
* Export enum symbols via userspace.
*/
@@ -78,6 +111,7 @@ enum fscache_volume_trace {
fscache_cache_traces;
fscache_volume_traces;
+fscache_cookie_traces;
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
@@ -139,6 +173,84 @@ TRACE_EVENT(fscache_volume,
__entry->usage)
);
+TRACE_EVENT(fscache_cookie,
+ TP_PROTO(unsigned int cookie_debug_id,
+ int ref,
+ enum fscache_cookie_trace where),
+
+ TP_ARGS(cookie_debug_id, ref, where),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(int, ref )
+ __field(enum fscache_cookie_trace, where )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie_debug_id;
+ __entry->ref = ref;
+ __entry->where = where;
+ ),
+
+ TP_printk("c=%08x %s r=%d",
+ __entry->cookie,
+ __print_symbolic(__entry->where, fscache_cookie_traces),
+ __entry->ref)
+ );
+
+TRACE_EVENT(fscache_acquire,
+ TP_PROTO(struct fscache_cookie *cookie),
+
+ TP_ARGS(cookie),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, volume )
+ __field(int, v_ref )
+ __field(int, v_n_cookies )
+ __field(struct fscache_cookie *, cookie_p )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->volume = cookie->volume->debug_id;
+ __entry->v_ref = refcount_read(&cookie->volume->ref);
+ __entry->v_n_cookies = atomic_read(&cookie->volume->n_cookies);
+ ),
+
+ TP_printk("c=%08x V=%08x vr=%d vc=%d",
+ __entry->cookie,
+ __entry->volume, __entry->v_ref, __entry->v_n_cookies)
+ );
+
+TRACE_EVENT(fscache_relinquish,
+ TP_PROTO(struct fscache_cookie *cookie, bool retire),
+
+ TP_ARGS(cookie, retire),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(unsigned int, volume )
+ __field(int, ref )
+ __field(int, n_active )
+ __field(u8, flags )
+ __field(bool, retire )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->volume = cookie->volume->debug_id;
+ __entry->ref = refcount_read(&cookie->ref);
+ __entry->n_active = atomic_read(&cookie->n_active);
+ __entry->flags = cookie->flags;
+ __entry->retire = retire;
+ ),
+
+ TP_printk("c=%08x V=%08x r=%d U=%d f=%02x rt=%u",
+ __entry->cookie, __entry->volume, __entry->ref,
+ __entry->n_active, __entry->flags, __entry->retire)
+ );
+
#endif /* _TRACE_FSCACHE_H */
/* This part must be outside protection */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 12/53] fscache: Implement cache-level access helpers
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (10 preceding siblings ...)
2021-10-22 19:01 ` [PATCH v2 11/53] fscache: Implement cookie registration David Howells
@ 2021-10-22 19:02 ` David Howells
2021-10-22 19:02 ` [PATCH v2 13/53] fscache: Implement volume-level " David Howells
` (42 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:02 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add a pair of helper functions to pin/unpin a cache that we're wanting to
do a high-level access to (such as creating or removing a volume).
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/cache.c | 37 ++++++++++++++++++++++++++++++++++++
fs/fscache/internal.h | 2 ++
fs/fscache/main.c | 2 ++
include/trace/events/fscache.h | 41 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 82 insertions(+)
diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
index da08e29ee5b9..3cde698c5015 100644
--- a/fs/fscache/cache.c
+++ b/fs/fscache/cache.c
@@ -171,6 +171,43 @@ void fscache_put_cache(struct fscache_cache *cache,
}
EXPORT_SYMBOL(fscache_put_cache);
+/*
+ * Get an increment on a cache's access counter if the cache is live to prevent
+ * it from going away whilst we're accessing it.
+ */
+bool fscache_begin_cache_access(struct fscache_cache *cache, enum fscache_access_trace why)
+{
+ int n_accesses;
+
+ if (!fscache_cache_is_live(cache))
+ return false;
+
+ n_accesses = atomic_inc_return(&cache->n_accesses);
+ smp_mb__after_atomic(); /* Reread live flag after n_accesses */
+ trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),
+ n_accesses, why);
+ if (!fscache_cache_is_live(cache)) {
+ fscache_end_cache_access(cache, fscache_access_unlive);
+ return false;
+ }
+ return true;
+}
+
+/*
+ * Drop an increment on a cache's access counter.
+ */
+void fscache_end_cache_access(struct fscache_cache *cache, enum fscache_access_trace why)
+{
+ int n_accesses;
+
+ smp_mb__before_atomic();
+ n_accesses = atomic_dec_return(&cache->n_accesses);
+ trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),
+ n_accesses, why);
+ if (n_accesses == 0)
+ wake_up_var(&cache->n_accesses);
+}
+
#ifdef CONFIG_PROC_FS
static const char fscache_cache_states[NR__FSCACHE_CACHE_STATE] = "-PAEW";
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 9daacd7de9ea..5546c24d18d8 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -23,6 +23,8 @@
#ifdef CONFIG_PROC_FS
extern const struct seq_operations fscache_caches_seq_ops;
#endif
+bool fscache_begin_cache_access(struct fscache_cache *cache, enum fscache_access_trace why);
+void fscache_end_cache_access(struct fscache_cache *cache, enum fscache_access_trace why);
struct fscache_cache *fscache_lookup_cache(const char *name, bool is_cache);
/*
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index fad9c1933987..e1f14b29cff4 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -21,6 +21,8 @@ module_param_named(debug, fscache_debug, uint,
MODULE_PARM_DESC(fscache_debug,
"FS-Cache debugging mask");
+EXPORT_TRACEPOINT_SYMBOL(fscache_access_cache);
+
struct workqueue_struct *fscache_wq;
EXPORT_SYMBOL(fscache_wq);
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index cfa4c153c72b..d09d7e3ac86c 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -59,6 +59,12 @@ enum fscache_cookie_trace {
fscache_cookie_see_work,
};
+enum fscache_access_trace {
+ fscache_access_cache_pin,
+ fscache_access_cache_unpin,
+ fscache_access_unlive,
+};
+
#endif
/*
@@ -101,6 +107,11 @@ enum fscache_cookie_trace {
EM(fscache_cookie_see_withdraw, "- x-wth") \
E_(fscache_cookie_see_work, "- work ")
+#define fscache_access_traces \
+ EM(fscache_access_cache_pin, "PIN cache ") \
+ EM(fscache_access_cache_unpin, "UNPIN cache ") \
+ E_(fscache_access_unlive, "END unlive ")
+
/*
* Export enum symbols via userspace.
*/
@@ -112,6 +123,7 @@ enum fscache_cookie_trace {
fscache_cache_traces;
fscache_volume_traces;
fscache_cookie_traces;
+fscache_access_traces;
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
@@ -198,6 +210,35 @@ TRACE_EVENT(fscache_cookie,
__entry->ref)
);
+TRACE_EVENT(fscache_access_cache,
+ TP_PROTO(unsigned int cache_debug_id,
+ int ref,
+ int n_accesses,
+ enum fscache_access_trace why),
+
+ TP_ARGS(cache_debug_id, ref, n_accesses, why),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cache )
+ __field(int, ref )
+ __field(int, n_accesses )
+ __field(enum fscache_access_trace, why )
+ ),
+
+ TP_fast_assign(
+ __entry->cache = cache_debug_id;
+ __entry->ref = ref;
+ __entry->n_accesses = n_accesses;
+ __entry->why = why;
+ ),
+
+ TP_printk("C=%08x %s r=%d a=%d",
+ __entry->cache,
+ __print_symbolic(__entry->why, fscache_access_traces),
+ __entry->ref,
+ __entry->n_accesses)
+ );
+
TRACE_EVENT(fscache_acquire,
TP_PROTO(struct fscache_cookie *cookie),
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 13/53] fscache: Implement volume-level access helpers
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (11 preceding siblings ...)
2021-10-22 19:02 ` [PATCH v2 12/53] fscache: Implement cache-level access helpers David Howells
@ 2021-10-22 19:02 ` David Howells
2021-10-22 19:02 ` [PATCH v2 14/53] fscache: Implement cookie-level " David Howells
` (41 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:02 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add a pair of helper functions to manage access to a volume, pinning the
volume in place for the duration to prevent cache withdrawal from removing
it:
bool fscache_begin_volume_access(struct fscache_volume *volume,
enum fscache_access_trace why);
void fscache_end_volume_access(struct fscache_volume *volume,
enum fscache_access_trace why);
The first is intended for internal use only, but the second will be used by
the cache backend also.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/internal.h | 2 ++
fs/fscache/main.c | 1 +
fs/fscache/volume.c | 47 ++++++++++++++++++++++++++++++++++++++++
include/linux/fscache-cache.h | 3 +++
include/trace/events/fscache.h | 30 ++++++++++++++++++++++++++
5 files changed, 83 insertions(+)
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 5546c24d18d8..18f9a408a4f4 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -107,6 +107,8 @@ struct fscache_volume *fscache_get_volume(struct fscache_volume *volume,
enum fscache_volume_trace where);
void fscache_put_volume(struct fscache_volume *volume,
enum fscache_volume_trace where);
+bool fscache_begin_volume_access(struct fscache_volume *volume,
+ enum fscache_access_trace why);
void fscache_create_volume(struct fscache_volume *volume, bool wait);
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index e1f14b29cff4..6a024c45eb0b 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -22,6 +22,7 @@ MODULE_PARM_DESC(fscache_debug,
"FS-Cache debugging mask");
EXPORT_TRACEPOINT_SYMBOL(fscache_access_cache);
+EXPORT_TRACEPOINT_SYMBOL(fscache_access_volume);
struct workqueue_struct *fscache_wq;
EXPORT_SYMBOL(fscache_wq);
diff --git a/fs/fscache/volume.c b/fs/fscache/volume.c
index 924851888f18..d539d6ec2664 100644
--- a/fs/fscache/volume.c
+++ b/fs/fscache/volume.c
@@ -33,6 +33,53 @@ static void fscache_see_volume(struct fscache_volume *volume,
trace_fscache_volume(volume->debug_id, ref, where);
}
+/*
+ * Pin the cache behind a volume so that we can access it.
+ */
+static void __fscache_begin_volume_access(struct fscache_volume *volume,
+ enum fscache_access_trace why)
+{
+ int n_accesses;
+
+ n_accesses = atomic_inc_return(&volume->n_accesses);
+ smp_mb__after_atomic();
+ trace_fscache_access_volume(volume->debug_id, refcount_read(&volume->ref),
+ n_accesses, why);
+}
+
+/*
+ * If the cache behind a volume is live, pin it so that we can access it.
+ */
+bool fscache_begin_volume_access(struct fscache_volume *volume,
+ enum fscache_access_trace why)
+{
+ if (!fscache_cache_is_live(volume->cache))
+ return false;
+ __fscache_begin_volume_access(volume, why);
+ if (!fscache_cache_is_live(volume->cache)) {
+ fscache_end_volume_access(volume, fscache_access_unlive);
+ return false;
+ }
+ return true;
+}
+
+/*
+ * Mark the end of an access on a volume.
+ */
+void fscache_end_volume_access(struct fscache_volume *volume,
+ enum fscache_access_trace why)
+{
+ int n_accesses;
+
+ smp_mb__before_atomic();
+ n_accesses = atomic_dec_return(&volume->n_accesses);
+ trace_fscache_access_volume(volume->debug_id, refcount_read(&volume->ref),
+ n_accesses, why);
+ if (n_accesses == 0)
+ wake_up_var(&volume->n_accesses);
+}
+EXPORT_SYMBOL(fscache_end_volume_access);
+
static long fscache_compare_volume(const struct fscache_volume *a,
const struct fscache_volume *b)
{
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index e075cca1a30d..7db4dda74951 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -77,6 +77,9 @@ extern struct fscache_cache *fscache_acquire_cache(const char *name);
extern void fscache_put_cache(struct fscache_cache *cache,
enum fscache_cache_trace where);
+extern void fscache_end_volume_access(struct fscache_volume *volume,
+ enum fscache_access_trace why);
+
extern struct fscache_cookie *fscache_get_cookie(struct fscache_cookie *cookie,
enum fscache_cookie_trace where);
extern void fscache_put_cookie(struct fscache_cookie *cookie,
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index d09d7e3ac86c..4b35fe9cd906 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -40,6 +40,7 @@ enum fscache_volume_trace {
fscache_volume_put_relinquish,
fscache_volume_see_create_work,
fscache_volume_see_hash_wake,
+ fscache_volume_wait_create_work,
};
enum fscache_cookie_trace {
@@ -239,6 +240,35 @@ TRACE_EVENT(fscache_access_cache,
__entry->n_accesses)
);
+TRACE_EVENT(fscache_access_volume,
+ TP_PROTO(unsigned int volume_debug_id,
+ int ref,
+ int n_accesses,
+ enum fscache_access_trace why),
+
+ TP_ARGS(volume_debug_id, ref, n_accesses, why),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, volume )
+ __field(int, ref )
+ __field(int, n_accesses )
+ __field(enum fscache_access_trace, why )
+ ),
+
+ TP_fast_assign(
+ __entry->volume = volume_debug_id;
+ __entry->ref = ref;
+ __entry->n_accesses = n_accesses;
+ __entry->why = why;
+ ),
+
+ TP_printk("V=%08x %s r=%d a=%d",
+ __entry->volume,
+ __print_symbolic(__entry->why, fscache_access_traces),
+ __entry->ref,
+ __entry->n_accesses)
+ );
+
TRACE_EVENT(fscache_acquire,
TP_PROTO(struct fscache_cookie *cookie),
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 14/53] fscache: Implement cookie-level access helpers
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (12 preceding siblings ...)
2021-10-22 19:02 ` [PATCH v2 13/53] fscache: Implement volume-level " David Howells
@ 2021-10-22 19:02 ` David Howells
2021-10-22 19:02 ` [PATCH v2 15/53] fscache: Implement functions add/remove a cache David Howells
` (40 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:02 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add a pair of helper functions to manage access to a cookie, pinning the
cache object in place for the duration to prevent cache withdrawal from
removing it:
bool fscache_begin_cookie_access(struct fscache_cookie *cookie,
enum fscache_access_trace why);
void fscache_end_cookie_access(struct fscache_cookie *cookie,
enum fscache_access_trace why);
The first is intended for internal use only, but the second will be used by
the cache backend also.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/cookie.c | 60 ++++++++++++++++++++++++++++++++++++++++
fs/fscache/internal.h | 3 ++
fs/fscache/main.c | 1 +
include/linux/fscache-cache.h | 2 +
include/trace/events/fscache.h | 29 +++++++++++++++++++
5 files changed, 95 insertions(+)
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index 87ee8b666765..9b6ddbc01825 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -57,6 +57,66 @@ static void fscache_free_cookie(struct fscache_cookie *cookie)
kmem_cache_free(fscache_cookie_jar, cookie);
}
+static void __fscache_end_cookie_access(struct fscache_cookie *cookie)
+{
+ if (test_bit(FSCACHE_COOKIE_DO_RELINQUISH, &cookie->flags))
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_RELINQUISHING);
+ else if (test_bit(FSCACHE_COOKIE_DO_WITHDRAW, &cookie->flags))
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_WITHDRAWING);
+ // PLACEHOLDER: Schedule cookie cleanup
+}
+
+/*
+ * Mark the end of an access on a cookie. This brings a deferred
+ * relinquishment or withdrawal stage into effect.
+ */
+void fscache_end_cookie_access(struct fscache_cookie *cookie,
+ enum fscache_access_trace why)
+{
+ int n_accesses;
+
+ smp_mb__before_atomic();
+ n_accesses = atomic_dec_return(&cookie->n_accesses);
+ trace_fscache_access(cookie->debug_id, refcount_read(&cookie->ref),
+ n_accesses, why);
+ if (n_accesses == 0)
+ __fscache_end_cookie_access(cookie);
+}
+EXPORT_SYMBOL(fscache_end_cookie_access);
+
+/*
+ * Pin the cache behind a cookie so that we can access it.
+ */
+static void __fscache_begin_cookie_access(struct fscache_cookie *cookie,
+ enum fscache_access_trace why)
+{
+ int n_accesses;
+
+ n_accesses = atomic_inc_return(&cookie->n_accesses);
+ smp_mb__after_atomic(); /* (Future) read stage after is-caching.
+ * Reread n_accesses after is-caching
+ */
+ trace_fscache_access(cookie->debug_id, refcount_read(&cookie->ref),
+ n_accesses, why);
+}
+
+/*
+ * Pin the cache behind a cookie so that we can access it.
+ */
+bool fscache_begin_cookie_access(struct fscache_cookie *cookie,
+ enum fscache_access_trace why)
+{
+ if (!test_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags))
+ return false;
+ __fscache_begin_cookie_access(cookie, why);
+ if (!test_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags) ||
+ !fscache_cache_is_live(cookie->volume->cache)) {
+ fscache_end_cookie_access(cookie, fscache_access_unlive);
+ return false;
+ }
+ return true;
+}
+
static inline void wake_up_cookie_stage(struct fscache_cookie *cookie)
{
/* Use a barrier to ensure that waiters see the stage variable
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 18f9a408a4f4..5669ba4bc8a9 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -34,6 +34,9 @@ extern struct kmem_cache *fscache_cookie_jar;
extern const struct seq_operations fscache_cookies_seq_ops;
extern void fscache_print_cookie(struct fscache_cookie *cookie, char prefix);
+extern bool fscache_begin_cookie_access(struct fscache_cookie *cookie,
+ enum fscache_access_trace why);
+
static inline void fscache_see_cookie(struct fscache_cookie *cookie,
enum fscache_cookie_trace where)
{
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index 6a024c45eb0b..01d57433702c 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -23,6 +23,7 @@ MODULE_PARM_DESC(fscache_debug,
EXPORT_TRACEPOINT_SYMBOL(fscache_access_cache);
EXPORT_TRACEPOINT_SYMBOL(fscache_access_volume);
+EXPORT_TRACEPOINT_SYMBOL(fscache_access);
struct workqueue_struct *fscache_wq;
EXPORT_SYMBOL(fscache_wq);
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 7db4dda74951..a10f87421438 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -84,6 +84,8 @@ extern struct fscache_cookie *fscache_get_cookie(struct fscache_cookie *cookie,
enum fscache_cookie_trace where);
extern void fscache_put_cookie(struct fscache_cookie *cookie,
enum fscache_cookie_trace where);
+extern void fscache_end_cookie_access(struct fscache_cookie *cookie,
+ enum fscache_access_trace why);
extern void fscache_set_cookie_stage(struct fscache_cookie *cookie,
enum fscache_cookie_stage stage);
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 4b35fe9cd906..132381921be9 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -269,6 +269,35 @@ TRACE_EVENT(fscache_access_volume,
__entry->n_accesses)
);
+TRACE_EVENT(fscache_access,
+ TP_PROTO(unsigned int cookie_debug_id,
+ int ref,
+ int n_accesses,
+ enum fscache_access_trace why),
+
+ TP_ARGS(cookie_debug_id, ref, n_accesses, why),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(int, ref )
+ __field(int, n_accesses )
+ __field(enum fscache_access_trace, why )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie_debug_id;
+ __entry->ref = ref;
+ __entry->n_accesses = n_accesses;
+ __entry->why = why;
+ ),
+
+ TP_printk("c=%08x %s r=%d a=%d",
+ __entry->cookie,
+ __print_symbolic(__entry->why, fscache_access_traces),
+ __entry->ref,
+ __entry->n_accesses)
+ );
+
TRACE_EVENT(fscache_acquire,
TP_PROTO(struct fscache_cookie *cookie),
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 15/53] fscache: Implement functions add/remove a cache
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (13 preceding siblings ...)
2021-10-22 19:02 ` [PATCH v2 14/53] fscache: Implement cookie-level " David Howells
@ 2021-10-22 19:02 ` David Howells
2021-10-22 19:02 ` [PATCH v2 16/53] fscache: Provide and use cache methods to lookup/create/free a volume David Howells
` (39 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:02 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement functions to allow the cache backend to add or remove a cache.
Signed-off-by: David Howells <dhowells@redhat.com>cc: linux-cachefs@redhat.com
---
fs/fscache/cache.c | 67 ++++++++++++++++++++++++++++++++++++++++
include/linux/fscache-cache.h | 14 ++++++++
include/trace/events/fscache.h | 6 +++-
3 files changed, 86 insertions(+), 1 deletion(-)
diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
index 3cde698c5015..bed491c99834 100644
--- a/fs/fscache/cache.c
+++ b/fs/fscache/cache.c
@@ -171,6 +171,48 @@ void fscache_put_cache(struct fscache_cache *cache,
}
EXPORT_SYMBOL(fscache_put_cache);
+/**
+ * fscache_add_cache - Declare a cache as being open for business
+ * @cache: The record describing the cache
+ * @ops: Table of cache operations to use
+ * @cache_priv: Private data for the cache record
+ *
+ * Add a cache to the system, making it available for netfs's to use.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+int fscache_add_cache(struct fscache_cache *cache,
+ const struct fscache_cache_ops *ops,
+ void *cache_priv)
+{
+ int n_accesses;
+
+ _enter("{%s,%s}", ops->name, cache->name);
+
+ BUG_ON(fscache_cache_state(cache) != FSCACHE_CACHE_IS_PREPARING);
+
+ /* Get a ref on the cache cookie and keep its n_accesses counter raised
+ * by 1 to prevent wakeups from transitioning it to 0 until we're
+ * withdrawing caching services from it.
+ */
+ n_accesses = atomic_inc_return(&cache->n_accesses);
+ trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),
+ n_accesses, fscache_access_cache_pin);
+
+ down_write(&fscache_addremove_sem);
+
+ cache->ops = ops;
+ cache->cache_priv = cache_priv;
+ fscache_set_cache_state(cache, FSCACHE_CACHE_IS_ACTIVE);
+
+ up_write(&fscache_addremove_sem);
+ pr_notice("Cache \"%s\" added (type %s)\n", cache->name, ops->name);
+ _leave(" = 0 [%s]", cache->name);
+ return 0;
+}
+EXPORT_SYMBOL(fscache_add_cache);
+
/*
* Get an increment on a cache's access counter if the cache is live to prevent
* it from going away whilst we're accessing it.
@@ -208,6 +250,31 @@ void fscache_end_cache_access(struct fscache_cache *cache, enum fscache_access_t
wake_up_var(&cache->n_accesses);
}
+/**
+ * fscache_withdraw_cache - Withdraw a cache from the active service
+ * @cache: The cache cookie
+ *
+ * Begin the process of withdrawing a cache from service.
+ */
+void fscache_withdraw_cache(struct fscache_cache *cache)
+{
+ int n_accesses;
+
+ pr_notice("Withdrawing cache \"%s\" (%u objs)\n",
+ cache->name, atomic_read(&cache->object_count));
+
+ fscache_set_cache_state(cache, FSCACHE_CACHE_IS_WITHDRAWN);
+
+ /* Allow wakeups on dec-to-0 */
+ n_accesses = atomic_dec_return(&cache->n_accesses);
+ trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),
+ n_accesses, fscache_access_cache_unpin);
+
+ wait_var_event(&cache->n_accesses,
+ atomic_read(&cache->n_accesses) == 0);
+}
+EXPORT_SYMBOL(fscache_withdraw_cache);
+
#ifdef CONFIG_PROC_FS
static const char fscache_cache_states[NR__FSCACHE_CACHE_STATE] = "-PAEW";
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index a10f87421438..d2301ec88ff9 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -17,6 +17,7 @@
#include <linux/fscache.h>
struct fscache_cache;
+struct fscache_cache_ops;
enum fscache_cache_trace;
enum fscache_cookie_trace;
enum fscache_access_trace;
@@ -34,6 +35,7 @@ enum fscache_cache_state {
* Cache cookie.
*/
struct fscache_cache {
+ const struct fscache_cache_ops *ops;
struct list_head cache_link; /* Link in cache list */
void *cache_priv; /* Private cache data (or NULL) */
refcount_t ref;
@@ -45,6 +47,14 @@ struct fscache_cache {
char *name;
};
+/*
+ * cache operations
+ */
+struct fscache_cache_ops {
+ /* name of cache provider */
+ const char *name;
+};
+
static inline enum fscache_cache_state fscache_cache_state(const struct fscache_cache *cache)
{
return smp_load_acquire(&cache->state);
@@ -74,8 +84,12 @@ static inline bool fscache_set_cache_state_maybe(struct fscache_cache *cache,
*/
extern struct rw_semaphore fscache_addremove_sem;
extern struct fscache_cache *fscache_acquire_cache(const char *name);
+extern int fscache_add_cache(struct fscache_cache *cache,
+ const struct fscache_cache_ops *ops,
+ void *cache_priv);
extern void fscache_put_cache(struct fscache_cache *cache,
enum fscache_cache_trace where);
+extern void fscache_withdraw_cache(struct fscache_cache *cache);
extern void fscache_end_volume_access(struct fscache_volume *volume,
enum fscache_access_trace why);
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 132381921be9..c256f30d4dd4 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -24,7 +24,9 @@ enum fscache_cache_trace {
fscache_cache_get_acquire,
fscache_cache_new_acquire,
fscache_cache_put_alloc_volume,
+ fscache_cache_put_cache,
fscache_cache_put_volume,
+ fscache_cache_put_withdraw,
};
enum fscache_volume_trace {
@@ -76,7 +78,9 @@ enum fscache_access_trace {
EM(fscache_cache_get_acquire, "GET acq ") \
EM(fscache_cache_new_acquire, "NEW acq ") \
EM(fscache_cache_put_alloc_volume, "PUT alvol") \
- E_(fscache_cache_put_volume, "PUT vol ")
+ EM(fscache_cache_put_cache, "PUT cache") \
+ EM(fscache_cache_put_volume, "PUT vol ") \
+ E_(fscache_cache_put_withdraw, "PUT withd")
#define fscache_volume_traces \
EM(fscache_volume_collision, "*COLLIDE*") \
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 16/53] fscache: Provide and use cache methods to lookup/create/free a volume
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (14 preceding siblings ...)
2021-10-22 19:02 ` [PATCH v2 15/53] fscache: Implement functions add/remove a cache David Howells
@ 2021-10-22 19:02 ` David Howells
2021-10-22 19:03 ` [PATCH v2 17/53] fscache: Add a function for a cache backend to note an I/O error David Howells
` (38 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:02 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add cache methods to lookup, create and remove a volume.
Looking up or creating the volume requires the cache pinning for access;
freeing the volume requires the volume pinning for access.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/volume.c | 66 ++++++++++++++++++++++++++++++++++++++--
include/linux/fscache-cache.h | 6 ++++
include/trace/events/fscache.h | 11 ++++++-
3 files changed, 79 insertions(+), 4 deletions(-)
diff --git a/fs/fscache/volume.c b/fs/fscache/volume.c
index d539d6ec2664..d1e57ce95b72 100644
--- a/fs/fscache/volume.c
+++ b/fs/fscache/volume.c
@@ -15,6 +15,8 @@ static struct hlist_bl_head fscache_volume_hash[1 << fscache_volume_hash_shift];
static atomic_t fscache_volume_debug_id;
static LIST_HEAD(fscache_volumes);
+static void fscache_create_volume_work(struct work_struct *work);
+
struct fscache_volume *fscache_get_volume(struct fscache_volume *volume,
enum fscache_volume_trace where)
{
@@ -179,7 +181,7 @@ static struct fscache_volume *fscache_alloc_volume(const char *volume_key,
volume->cache = cache;
volume->coherency = coherency_data;
INIT_LIST_HEAD(&volume->proc_link);
- INIT_WORK(&volume->work, NULL /* PLACEHOLDER */);
+ INIT_WORK(&volume->work, fscache_create_volume_work);
refcount_set(&volume->ref, 1);
spin_lock_init(&volume->lock);
@@ -216,6 +218,58 @@ static struct fscache_volume *fscache_alloc_volume(const char *volume_key,
return NULL;
}
+/*
+ * Create a volume's representation on disk. Have a volume ref and a cache
+ * access we have to release.
+ */
+static void fscache_create_volume_work(struct work_struct *work)
+{
+ const struct fscache_cache_ops *ops;
+ struct fscache_volume *volume =
+ container_of(work, struct fscache_volume, work);
+
+ fscache_see_volume(volume, fscache_volume_see_create_work);
+
+ ops = volume->cache->ops;
+ if (ops->acquire_volume)
+ ops->acquire_volume(volume);
+ fscache_end_cache_access(volume->cache,
+ fscache_access_acquire_volume_end);
+
+ clear_bit_unlock(FSCACHE_VOLUME_CREATING, &volume->flags);
+ wake_up_bit(&volume->flags, FSCACHE_VOLUME_CREATING);
+ fscache_put_volume(volume, fscache_volume_put_create_work);
+}
+
+/*
+ * Dispatch a worker thread to create a volume's representation on disk.
+ */
+void fscache_create_volume(struct fscache_volume *volume, bool wait)
+{
+ if (test_and_set_bit(FSCACHE_VOLUME_CREATING, &volume->flags))
+ goto maybe_wait;
+ if (volume->cache_priv)
+ goto no_wait; /* We raced */
+ if (!fscache_begin_cache_access(volume->cache,
+ fscache_access_acquire_volume))
+ goto no_wait;
+
+ fscache_get_volume(volume, fscache_volume_get_create_work);
+ if (!schedule_work(&volume->work))
+ fscache_put_volume(volume, fscache_volume_put_create_work);
+
+maybe_wait:
+ if (wait) {
+ fscache_see_volume(volume, fscache_volume_wait_create_work);
+ wait_on_bit(&volume->flags, FSCACHE_VOLUME_CREATING,
+ TASK_UNINTERRUPTIBLE);
+ }
+ return;
+no_wait:
+ clear_bit_unlock(FSCACHE_VOLUME_CREATING, &volume->flags);
+ wake_up_bit(&volume->flags, FSCACHE_VOLUME_CREATING);
+}
+
/*
* Acquire a volume representation cookie and link it to a (proposed) cache.
*/
@@ -234,7 +288,7 @@ struct fscache_volume *__fscache_acquire_volume(const char *volume_key,
return NULL;
}
- // PLACEHOLDER: Create the volume if we have a cache available
+ fscache_create_volume(volume, false);
return volume;
}
EXPORT_SYMBOL(__fscache_acquire_volume);
@@ -281,7 +335,13 @@ static void fscache_free_volume(struct fscache_volume *volume)
struct fscache_cache *cache = volume->cache;
if (volume->cache_priv) {
- // PLACEHOLDER: Detach any attached cache
+ __fscache_begin_volume_access(volume, fscache_access_relinquish_volume);
+ if (volume->cache_priv) {
+ const struct fscache_cache_ops *ops = cache->ops;
+ if (ops->free_volume)
+ ops->free_volume(volume);
+ }
+ fscache_end_volume_access(volume, fscache_access_relinquish_volume_end);
}
down_write(&fscache_addremove_sem);
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index d2301ec88ff9..558d4bbbe486 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -53,6 +53,12 @@ struct fscache_cache {
struct fscache_cache_ops {
/* name of cache provider */
const char *name;
+
+ /* Acquire a volume */
+ void (*acquire_volume)(struct fscache_volume *volume);
+
+ /* Free the cache's data attached to a volume */
+ void (*free_volume)(struct fscache_volume *volume);
};
static inline enum fscache_cache_state fscache_cache_state(const struct fscache_cache *cache)
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index c256f30d4dd4..3476cc7fdb25 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -63,8 +63,12 @@ enum fscache_cookie_trace {
};
enum fscache_access_trace {
+ fscache_access_acquire_volume,
+ fscache_access_acquire_volume_end,
fscache_access_cache_pin,
fscache_access_cache_unpin,
+ fscache_access_relinquish_volume,
+ fscache_access_relinquish_volume_end,
fscache_access_unlive,
};
@@ -94,7 +98,8 @@ enum fscache_access_trace {
EM(fscache_volume_put_hash_collision, "PUT hcoll") \
EM(fscache_volume_put_relinquish, "PUT relnq") \
EM(fscache_volume_see_create_work, "SEE creat") \
- E_(fscache_volume_see_hash_wake, "SEE hwake")
+ EM(fscache_volume_see_hash_wake, "SEE hwake") \
+ E_(fscache_volume_wait_create_work, "WAIT crea")
#define fscache_cookie_traces \
EM(fscache_cookie_collision, "*COLLIDE*") \
@@ -113,8 +118,12 @@ enum fscache_access_trace {
E_(fscache_cookie_see_work, "- work ")
#define fscache_access_traces \
+ EM(fscache_access_acquire_volume, "BEGIN acq_vol") \
+ EM(fscache_access_acquire_volume_end, "END acq_vol") \
EM(fscache_access_cache_pin, "PIN cache ") \
EM(fscache_access_cache_unpin, "UNPIN cache ") \
+ EM(fscache_access_relinquish_volume, "BEGIN rlq_vol") \
+ EM(fscache_access_relinquish_volume_end,"END rlq_vol") \
E_(fscache_access_unlive, "END unlive ")
/*
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 17/53] fscache: Add a function for a cache backend to note an I/O error
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (15 preceding siblings ...)
2021-10-22 19:02 ` [PATCH v2 16/53] fscache: Provide and use cache methods to lookup/create/free a volume David Howells
@ 2021-10-22 19:03 ` David Howells
2021-10-22 19:03 ` [PATCH v2 18/53] fscache: Implement simple cookie state machine David Howells
` (37 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:03 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add a function to the backend API to note an I/O error in a cache.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/cache.c | 20 ++++++++++++++++++++
include/linux/fscache-cache.h | 2 ++
2 files changed, 22 insertions(+)
diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c
index bed491c99834..bfe33104ba02 100644
--- a/fs/fscache/cache.c
+++ b/fs/fscache/cache.c
@@ -250,6 +250,26 @@ void fscache_end_cache_access(struct fscache_cache *cache, enum fscache_access_t
wake_up_var(&cache->n_accesses);
}
+/**
+ * fscache_io_error - Note a cache I/O error
+ * @cache: The record describing the cache
+ *
+ * Note that an I/O error occurred in a cache and that it should no longer be
+ * used for anything. This also reports the error into the kernel log.
+ *
+ * See Documentation/filesystems/caching/backend-api.rst for a complete
+ * description.
+ */
+void fscache_io_error(struct fscache_cache *cache)
+{
+ if (fscache_set_cache_state_maybe(cache,
+ FSCACHE_CACHE_IS_ACTIVE,
+ FSCACHE_CACHE_GOT_IOERROR))
+ pr_err("Cache '%s' stopped due to I/O error\n",
+ cache->name);
+}
+EXPORT_SYMBOL(fscache_io_error);
+
/**
* fscache_withdraw_cache - Withdraw a cache from the active service
* @cache: The cache cookie
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 558d4bbbe486..dfecabfd4a0e 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -97,6 +97,8 @@ extern void fscache_put_cache(struct fscache_cache *cache,
enum fscache_cache_trace where);
extern void fscache_withdraw_cache(struct fscache_cache *cache);
+extern void fscache_io_error(struct fscache_cache *cache);
+
extern void fscache_end_volume_access(struct fscache_volume *volume,
enum fscache_access_trace why);
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 18/53] fscache: Implement simple cookie state machine
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (16 preceding siblings ...)
2021-10-22 19:03 ` [PATCH v2 17/53] fscache: Add a function for a cache backend to note an I/O error David Howells
@ 2021-10-22 19:03 ` David Howells
2021-10-22 19:03 ` [PATCH v2 19/53] fscache: Implement cookie user counting and resource pinning David Howells
` (36 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:03 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement a very simple cookie state machine to handle lookup, withdrawal,
relinquishment and, eventually, timed committing and invalidation.
Changes
=======
ver #2)
- Fix a number of oopses when the cache tries to access cookie->object,
but the cache withdrew the object due to lookup failure at just the
wrong time (fscache_lookup_cookie() should call
fscache_withdraw_cookie() rather than calling the cache directly).
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/CAB9dFdumxi0U_339S3PfC4TL83Srqn+qGz2AAbJ995NiLhbxnw@mail.gmail.com/
---
fs/fscache/cookie.c | 170 +++++++++++++++++++++++++++++++++++++++-
include/linux/fscache-cache.h | 10 ++
include/trace/events/fscache.h | 2
3 files changed, 179 insertions(+), 3 deletions(-)
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index 9b6ddbc01825..b7373ebcaf56 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -15,7 +15,9 @@
struct kmem_cache *fscache_cookie_jar;
+static void fscache_cookie_worker(struct work_struct *work);
static void fscache_drop_cookie(struct fscache_cookie *cookie);
+static void fscache_lookup_cookie(struct fscache_cookie *cookie);
#define fscache_cookie_hash_shift 15
static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift];
@@ -57,13 +59,26 @@ static void fscache_free_cookie(struct fscache_cookie *cookie)
kmem_cache_free(fscache_cookie_jar, cookie);
}
+static void __fscache_queue_cookie(struct fscache_cookie *cookie)
+{
+ if (!queue_work(fscache_wq, &cookie->work))
+ fscache_put_cookie(cookie, fscache_cookie_put_over_queued);
+}
+
+static void fscache_queue_cookie(struct fscache_cookie *cookie,
+ enum fscache_cookie_trace where)
+{
+ fscache_get_cookie(cookie, where);
+ __fscache_queue_cookie(cookie);
+}
+
static void __fscache_end_cookie_access(struct fscache_cookie *cookie)
{
if (test_bit(FSCACHE_COOKIE_DO_RELINQUISH, &cookie->flags))
fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_RELINQUISHING);
else if (test_bit(FSCACHE_COOKIE_DO_WITHDRAW, &cookie->flags))
fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_WITHDRAWING);
- // PLACEHOLDER: Schedule cookie cleanup
+ fscache_queue_cookie(cookie, fscache_cookie_get_end_access);
}
/*
@@ -252,7 +267,7 @@ static struct fscache_cookie *fscache_alloc_cookie(
cookie->stage = FSCACHE_COOKIE_STAGE_QUIESCENT;
spin_lock_init(&cookie->lock);
INIT_LIST_HEAD(&cookie->commit_link);
- INIT_WORK(&cookie->work, NULL /* PLACEHOLDER */);
+ INIT_WORK(&cookie->work, fscache_cookie_worker);
write_lock(&fscache_cookies_lock);
list_add_tail(&cookie->proc_link, &fscache_cookies);
@@ -374,6 +389,136 @@ struct fscache_cookie *__fscache_acquire_cookie(
}
EXPORT_SYMBOL(__fscache_acquire_cookie);
+/*
+ * Prepare a cache object to be written to.
+ */
+static void fscache_prepare_to_write(struct fscache_cookie *cookie)
+{
+ cookie->volume->cache->ops->prepare_to_write(cookie);
+}
+
+/*
+ * Look up a cookie to the cache.
+ */
+static void fscache_lookup_cookie(struct fscache_cookie *cookie)
+{
+ bool changed_stage = false, need_withdraw = false, prep_write = false;
+
+ _enter("");
+
+ if (!cookie->volume->cache_priv) {
+ fscache_create_volume(cookie->volume, true);
+ if (!cookie->volume->cache_priv) {
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_QUIESCENT);
+ goto out;
+ }
+ }
+
+ if (!cookie->volume->cache->ops->lookup_cookie(cookie)) {
+ if (cookie->stage != FSCACHE_COOKIE_STAGE_FAILED)
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_QUIESCENT);
+ need_withdraw = true;
+ _leave(" [fail]");
+ goto out;
+ }
+
+ spin_lock(&cookie->lock);
+ if (cookie->stage != FSCACHE_COOKIE_STAGE_RELINQUISHING) {
+ prep_write = test_bit(FSCACHE_COOKIE_LOCAL_WRITE, &cookie->flags);
+ __fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_ACTIVE);
+ fscache_see_cookie(cookie, fscache_cookie_see_active);
+ changed_stage = true;
+ }
+ spin_unlock(&cookie->lock);
+ if (changed_stage)
+ wake_up_cookie_stage(cookie);
+ if (prep_write)
+ fscache_prepare_to_write(cookie);
+
+out:
+ fscache_end_cookie_access(cookie, fscache_access_lookup_cookie_end);
+ if (need_withdraw)
+ fscache_withdraw_cookie(cookie);
+ fscache_end_volume_access(cookie->volume, fscache_access_lookup_cookie_end);
+}
+
+/*
+ * Perform work upon the cookie, such as committing its cache state,
+ * relinquishing it or withdrawing the backing cache. We're protected from the
+ * cache going away under us as object withdrawal must come through this
+ * non-reentrant work item.
+ */
+static void __fscache_cookie_worker(struct fscache_cookie *cookie)
+{
+ _enter("c=%x", cookie->debug_id);
+
+again:
+ switch (READ_ONCE(cookie->stage)) {
+ case FSCACHE_COOKIE_STAGE_ACTIVE:
+ if (test_and_clear_bit(FSCACHE_COOKIE_DO_PREP_TO_WRITE, &cookie->flags))
+ fscache_prepare_to_write(cookie);
+ break;
+
+ case FSCACHE_COOKIE_STAGE_LOOKING_UP:
+ fscache_lookup_cookie(cookie);
+ goto again;
+
+ case FSCACHE_COOKIE_STAGE_CREATING:
+ WARN_ONCE(1, "Cookie %x in unexpected stage %u\n",
+ cookie->debug_id, cookie->stage);
+ break;
+
+ case FSCACHE_COOKIE_STAGE_FAILED:
+ break;
+
+ case FSCACHE_COOKIE_STAGE_RELINQUISHING:
+ case FSCACHE_COOKIE_STAGE_WITHDRAWING:
+ if (test_and_clear_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags) &&
+ cookie->cache_priv)
+ cookie->volume->cache->ops->withdraw_cookie(cookie);
+ if (cookie->stage == FSCACHE_COOKIE_STAGE_RELINQUISHING) {
+ fscache_see_cookie(cookie, fscache_cookie_see_relinquish);
+ fscache_drop_cookie(cookie);
+ break;
+ } else {
+ fscache_see_cookie(cookie, fscache_cookie_see_withdraw);
+ }
+ fallthrough;
+
+ case FSCACHE_COOKIE_STAGE_QUIESCENT:
+ case FSCACHE_COOKIE_STAGE_DROPPED:
+ clear_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
+ clear_bit(FSCACHE_COOKIE_DO_WITHDRAW, &cookie->flags);
+ clear_bit(FSCACHE_COOKIE_DO_COMMIT, &cookie->flags);
+ clear_bit(FSCACHE_COOKIE_DO_PREP_TO_WRITE, &cookie->flags);
+ set_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags);
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_QUIESCENT);
+ break;
+ }
+ _leave("");
+}
+
+static void fscache_cookie_worker(struct work_struct *work)
+{
+ struct fscache_cookie *cookie = container_of(work, struct fscache_cookie, work);
+
+ fscache_see_cookie(cookie, fscache_cookie_see_work);
+ __fscache_cookie_worker(cookie);
+ fscache_put_cookie(cookie, fscache_cookie_put_work);
+}
+
+/*
+ * Wait for the object to become inactive. The cookie's work item will be
+ * scheduled when someone transitions n_accesses to 0.
+ */
+static void __fscache_withdraw_cookie(struct fscache_cookie *cookie)
+{
+ if (test_and_clear_bit(FSCACHE_COOKIE_NACC_ELEVATED, &cookie->flags))
+ fscache_end_cookie_access(cookie, fscache_access_cache_unpin);
+ else
+ __fscache_end_cookie_access(cookie);
+}
+
/*
* Remove a cookie from the hash table.
*/
@@ -404,6 +549,25 @@ static void fscache_drop_cookie(struct fscache_cookie *cookie)
fscache_stat(&fscache_n_relinquishes_dropped);
}
+static void fscache_drop_withdraw_cookie(struct fscache_cookie *cookie)
+{
+ __fscache_withdraw_cookie(cookie);
+}
+
+/**
+ * fscache_withdraw_cookie - Mark a cookie for withdrawal
+ * @cookie: The cookie to be withdrawn.
+ *
+ * Allow the cache backend to withdraw the backing for a cookie for its own
+ * reasons, even if that cookie is in active use.
+ */
+void fscache_withdraw_cookie(struct fscache_cookie *cookie)
+{
+ set_bit(FSCACHE_COOKIE_DO_WITHDRAW, &cookie->flags);
+ fscache_drop_withdraw_cookie(cookie);
+}
+EXPORT_SYMBOL(fscache_withdraw_cookie);
+
/*
* Allow the netfs to release a cookie back to the cache.
* - the object will be marked as recyclable on disk if retire is true
@@ -432,7 +596,7 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
set_bit(FSCACHE_COOKIE_DO_RELINQUISH, &cookie->flags);
if (test_bit(FSCACHE_COOKIE_HAS_BEEN_CACHED, &cookie->flags))
- ; // PLACEHOLDER: Do something here if the cookie was cached
+ fscache_drop_withdraw_cookie(cookie);
else
fscache_drop_cookie(cookie);
fscache_put_cookie(cookie, fscache_cookie_put_relinquish);
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index dfecabfd4a0e..f6d63dc0ffa9 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -59,6 +59,15 @@ struct fscache_cache_ops {
/* Free the cache's data attached to a volume */
void (*free_volume)(struct fscache_volume *volume);
+
+ /* Look up a cookie in the cache */
+ bool (*lookup_cookie)(struct fscache_cookie *cookie);
+
+ /* Withdraw an object without any cookie access counts held */
+ void (*withdraw_cookie)(struct fscache_cookie *cookie);
+
+ /* Prepare to write to a live cache object */
+ void (*prepare_to_write)(struct fscache_cookie *cookie);
};
static inline enum fscache_cache_state fscache_cache_state(const struct fscache_cache *cache)
@@ -96,6 +105,7 @@ extern int fscache_add_cache(struct fscache_cache *cache,
extern void fscache_put_cache(struct fscache_cache *cache,
enum fscache_cache_trace where);
extern void fscache_withdraw_cache(struct fscache_cache *cache);
+extern void fscache_withdraw_cookie(struct fscache_cookie *cookie);
extern void fscache_io_error(struct fscache_cache *cache);
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 3476cc7fdb25..00ffe0f8e6d3 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -67,6 +67,7 @@ enum fscache_access_trace {
fscache_access_acquire_volume_end,
fscache_access_cache_pin,
fscache_access_cache_unpin,
+ fscache_access_lookup_cookie_end,
fscache_access_relinquish_volume,
fscache_access_relinquish_volume_end,
fscache_access_unlive,
@@ -122,6 +123,7 @@ enum fscache_access_trace {
EM(fscache_access_acquire_volume_end, "END acq_vol") \
EM(fscache_access_cache_pin, "PIN cache ") \
EM(fscache_access_cache_unpin, "UNPIN cache ") \
+ EM(fscache_access_lookup_cookie_end, "END lookup ") \
EM(fscache_access_relinquish_volume, "BEGIN rlq_vol") \
EM(fscache_access_relinquish_volume_end,"END rlq_vol") \
E_(fscache_access_unlive, "END unlive ")
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 19/53] fscache: Implement cookie user counting and resource pinning
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (17 preceding siblings ...)
2021-10-22 19:03 ` [PATCH v2 18/53] fscache: Implement simple cookie state machine David Howells
@ 2021-10-22 19:03 ` David Howells
2021-10-22 19:03 ` [PATCH v2 20/53] fscache: Implement cookie invalidation David Howells
` (35 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:03 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide a pair of functions to count the number of users of a cookie
(open files, writeback, invalidation, resizing, reads, writes) and to pin
cache resources for the whilst there are users.
The first function gets a usage on a cookie:
void fscache_use_cookie(struct fscache_cookie *cookie,
bool will_modify);
The caller should indicate the cookie to use and whether or not the caller
is in a context that may modify the cookie (e.g. a file open O_RDWR).
If not already open, this will trigger lookup and/or creation of the
backing store in the background and resources may be pinned to the cookie
by the cache.
The second function drops a usage on a cookie and, optionally, updates the
coherency data:
void fscache_unuse_cookie(struct fscache_cookie *cookie,
const void *aux_data,
const loff_t *object_size);
If non-NULL, the aux_data buffer and/or the object_size will be saved into
the cookie and will be set on the backing store when the object is
committed.
If this removes the last usage on a cookie, the cookie is placed onto an
LRU list from which it will be removed and closed after a couple of seconds
if it doesn't get reused. This prevents resource overload in the cache -
in particular it prevents it from holding too many files open.
Changes
=======
ver #2:
- Fix fscache_unuse_cookie() to use atomic_dec_and_lock() to avoid a
potential race if the cookie gets reused before it completes the
unusement.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/cookie.c | 207 ++++++++++++++++++++++++++++++++++++++++
fs/fscache/internal.h | 5 +
fs/fscache/stats.c | 12 ++
include/linux/fscache-cache.h | 14 +++
include/linux/fscache.h | 82 ++++++++++++++++
include/trace/events/fscache.h | 12 ++
6 files changed, 331 insertions(+), 1 deletion(-)
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index b7373ebcaf56..cf987756534c 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -15,6 +15,8 @@
struct kmem_cache *fscache_cookie_jar;
+static void fscache_cookie_lru_timed_out(struct timer_list *timer);
+static void fscache_cookie_lru_worker(struct work_struct *work);
static void fscache_cookie_worker(struct work_struct *work);
static void fscache_drop_cookie(struct fscache_cookie *cookie);
static void fscache_lookup_cookie(struct fscache_cookie *cookie);
@@ -23,7 +25,12 @@ static void fscache_lookup_cookie(struct fscache_cookie *cookie);
static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift];
static LIST_HEAD(fscache_cookies);
static DEFINE_RWLOCK(fscache_cookies_lock);
-static const char fscache_cookie_stages[FSCACHE_COOKIE_STAGE__NR] = "-LCAFWRD";
+static LIST_HEAD(fscache_cookie_lru);
+static DEFINE_SPINLOCK(fscache_cookie_lru_lock);
+DEFINE_TIMER(fscache_cookie_lru_timer, fscache_cookie_lru_timed_out);
+static DECLARE_WORK(fscache_cookie_lru_work, fscache_cookie_lru_worker);
+static const char fscache_cookie_stages[FSCACHE_COOKIE_STAGE__NR] = "-LCAFMWRD";
+unsigned int fscache_lru_cookie_timeout = 10 * HZ;
void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
{
@@ -48,6 +55,13 @@ void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
static void fscache_free_cookie(struct fscache_cookie *cookie)
{
+ if (WARN_ON_ONCE(!list_empty(&cookie->commit_link))) {
+ spin_lock(&fscache_cookie_lru_lock);
+ list_del_init(&cookie->commit_link);
+ spin_unlock(&fscache_cookie_lru_lock);
+ fscache_stat_d(&fscache_n_cookies_lru);
+ fscache_stat(&fscache_n_cookies_lru_removed);
+ }
write_lock(&fscache_cookies_lock);
list_del(&cookie->proc_link);
write_unlock(&fscache_cookies_lock);
@@ -442,6 +456,122 @@ static void fscache_lookup_cookie(struct fscache_cookie *cookie)
fscache_end_volume_access(cookie->volume, fscache_access_lookup_cookie_end);
}
+/*
+ * Start using the cookie for I/O. This prevents the backing object from being
+ * reaped by VM pressure.
+ */
+void __fscache_use_cookie(struct fscache_cookie *cookie, bool will_modify)
+{
+ enum fscache_cookie_stage stage;
+ bool changed_stage = false, queue = false;
+
+ _enter("c=%08x", cookie->debug_id);
+
+ if (WARN(test_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags),
+ "Trying to use relinquished cookie\n"))
+ return;
+
+ spin_lock(&cookie->lock);
+
+ atomic_inc(&cookie->n_active);
+
+again:
+ stage = cookie->stage;
+ switch (stage) {
+ case FSCACHE_COOKIE_STAGE_QUIESCENT:
+ if (will_modify) {
+ set_bit(FSCACHE_COOKIE_LOCAL_WRITE, &cookie->flags);
+ set_bit(FSCACHE_COOKIE_DO_PREP_TO_WRITE, &cookie->flags);
+ }
+ if (!fscache_begin_volume_access(cookie->volume,
+ fscache_access_lookup_cookie))
+ break;
+
+ __fscache_begin_cookie_access(cookie, fscache_access_lookup_cookie);
+ __fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_LOOKING_UP);
+ smp_mb__before_atomic(); /* Set stage before is-caching
+ * vs __fscache_begin_cookie_access()
+ */
+ set_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags);
+ set_bit(FSCACHE_COOKIE_HAS_BEEN_CACHED, &cookie->flags);
+ changed_stage = true;
+ queue = true;
+ break;
+
+ case FSCACHE_COOKIE_STAGE_LOOKING_UP:
+ case FSCACHE_COOKIE_STAGE_CREATING:
+ if (will_modify)
+ set_bit(FSCACHE_COOKIE_LOCAL_WRITE, &cookie->flags);
+ break;
+ case FSCACHE_COOKIE_STAGE_ACTIVE:
+ if (will_modify &&
+ !test_and_set_bit(FSCACHE_COOKIE_LOCAL_WRITE, &cookie->flags)) {
+ set_bit(FSCACHE_COOKIE_DO_PREP_TO_WRITE, &cookie->flags);
+ queue = true;
+ }
+ break;
+
+ case FSCACHE_COOKIE_STAGE_FAILED:
+ case FSCACHE_COOKIE_STAGE_WITHDRAWING:
+ break;
+
+ case FSCACHE_COOKIE_STAGE_COMMITTING:
+ spin_unlock(&cookie->lock);
+ wait_var_event(&cookie->stage,
+ READ_ONCE(cookie->stage) != FSCACHE_COOKIE_STAGE_COMMITTING);
+ spin_lock(&cookie->lock);
+ goto again;
+
+ case FSCACHE_COOKIE_STAGE_DROPPED:
+ case FSCACHE_COOKIE_STAGE_RELINQUISHING:
+ WARN(1, "Can't use cookie in stage %u\n", cookie->stage);
+ break;
+ }
+
+ spin_unlock(&cookie->lock);
+ if (changed_stage)
+ wake_up_cookie_stage(cookie);
+ if (queue)
+ fscache_queue_cookie(cookie, fscache_cookie_get_use_work);
+ _leave("");
+}
+EXPORT_SYMBOL(__fscache_use_cookie);
+
+static void fscache_unuse_cookie_locked(struct fscache_cookie *cookie)
+{
+ clear_bit(FSCACHE_COOKIE_DISABLED, &cookie->flags);
+ if (!test_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags))
+ return;
+
+ cookie->unused_at = jiffies;
+ spin_lock(&fscache_cookie_lru_lock);
+ if (list_empty(&cookie->commit_link)) {
+ fscache_get_cookie(cookie, fscache_cookie_get_lru);
+ fscache_stat(&fscache_n_cookies_lru);
+ }
+ list_move_tail(&cookie->commit_link, &fscache_cookie_lru);
+
+ spin_unlock(&fscache_cookie_lru_lock);
+ timer_reduce(&fscache_cookie_lru_timer,
+ jiffies + fscache_lru_cookie_timeout);
+}
+
+/*
+ * Stop using the cookie for I/O.
+ */
+void __fscache_unuse_cookie(struct fscache_cookie *cookie,
+ const void *aux_data, const loff_t *object_size)
+{
+ if (aux_data || object_size)
+ __fscache_update_cookie(cookie, aux_data, object_size);
+
+ if (atomic_dec_and_lock(&cookie->n_active, &cookie->lock)) {
+ fscache_unuse_cookie_locked(cookie);
+ spin_unlock(&cookie->lock);
+ }
+}
+EXPORT_SYMBOL(__fscache_unuse_cookie);
+
/*
* Perform work upon the cookie, such as committing its cache state,
* relinquishing it or withdrawing the backing cache. We're protected from the
@@ -471,6 +601,7 @@ static void __fscache_cookie_worker(struct fscache_cookie *cookie)
case FSCACHE_COOKIE_STAGE_FAILED:
break;
+ case FSCACHE_COOKIE_STAGE_COMMITTING:
case FSCACHE_COOKIE_STAGE_RELINQUISHING:
case FSCACHE_COOKIE_STAGE_WITHDRAWING:
if (test_and_clear_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags) &&
@@ -480,6 +611,8 @@ static void __fscache_cookie_worker(struct fscache_cookie *cookie)
fscache_see_cookie(cookie, fscache_cookie_see_relinquish);
fscache_drop_cookie(cookie);
break;
+ } else if (cookie->stage == FSCACHE_COOKIE_STAGE_COMMITTING) {
+ fscache_see_cookie(cookie, fscache_cookie_see_committing);
} else {
fscache_see_cookie(cookie, fscache_cookie_see_withdraw);
}
@@ -519,6 +652,77 @@ static void __fscache_withdraw_cookie(struct fscache_cookie *cookie)
__fscache_end_cookie_access(cookie);
}
+static void fscache_cookie_lru_do_one(struct fscache_cookie *cookie)
+{
+ fscache_see_cookie(cookie, fscache_cookie_see_lru_do_one);
+
+ spin_lock(&cookie->lock);
+ if (cookie->stage != FSCACHE_COOKIE_STAGE_ACTIVE ||
+ time_before(jiffies, cookie->unused_at + fscache_lru_cookie_timeout) ||
+ atomic_read(&cookie->n_active) > 0) {
+ spin_unlock(&cookie->lock);
+ fscache_stat(&fscache_n_cookies_lru_removed);
+ } else {
+ __fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_COMMITTING);
+ set_bit(FSCACHE_COOKIE_DO_COMMIT, &cookie->flags);
+ spin_unlock(&cookie->lock);
+ fscache_stat(&fscache_n_cookies_lru_expired);
+ _debug("lru c=%x", cookie->debug_id);
+ __fscache_withdraw_cookie(cookie);
+ }
+
+ fscache_put_cookie(cookie, fscache_cookie_put_lru);
+}
+
+static void fscache_cookie_lru_worker(struct work_struct *work)
+{
+ struct fscache_cookie *cookie;
+ unsigned long unused_at;
+
+ spin_lock(&fscache_cookie_lru_lock);
+
+ while (!list_empty(&fscache_cookie_lru)) {
+ cookie = list_first_entry(&fscache_cookie_lru,
+ struct fscache_cookie, commit_link);
+ unused_at = cookie->unused_at + fscache_lru_cookie_timeout;
+ if (time_before(jiffies, unused_at)) {
+ timer_reduce(&fscache_cookie_lru_timer, unused_at);
+ break;
+ }
+
+ list_del_init(&cookie->commit_link);
+ fscache_stat_d(&fscache_n_cookies_lru);
+ spin_unlock(&fscache_cookie_lru_lock);
+ fscache_cookie_lru_do_one(cookie);
+ spin_lock(&fscache_cookie_lru_lock);
+ }
+
+ spin_unlock(&fscache_cookie_lru_lock);
+}
+
+static void fscache_cookie_lru_timed_out(struct timer_list *timer)
+{
+ queue_work(fscache_wq, &fscache_cookie_lru_work);
+}
+
+static void fscache_cookie_drop_from_lru(struct fscache_cookie *cookie)
+{
+ bool need_put = false;
+
+ if (!list_empty(&cookie->commit_link)) {
+ spin_lock(&fscache_cookie_lru_lock);
+ if (!list_empty(&cookie->commit_link)) {
+ list_del_init(&cookie->commit_link);
+ fscache_stat_d(&fscache_n_cookies_lru);
+ fscache_stat(&fscache_n_cookies_lru_dropped);
+ need_put = true;
+ }
+ spin_unlock(&fscache_cookie_lru_lock);
+ if (need_put)
+ fscache_put_cookie(cookie, fscache_cookie_put_lru);
+ }
+}
+
/*
* Remove a cookie from the hash table.
*/
@@ -551,6 +755,7 @@ static void fscache_drop_cookie(struct fscache_cookie *cookie)
static void fscache_drop_withdraw_cookie(struct fscache_cookie *cookie)
{
+ fscache_cookie_drop_from_lru(cookie);
__fscache_withdraw_cookie(cookie);
}
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 5669ba4bc8a9..5aff9c143616 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -32,6 +32,7 @@ struct fscache_cache *fscache_lookup_cache(const char *name, bool is_cache);
*/
extern struct kmem_cache *fscache_cookie_jar;
extern const struct seq_operations fscache_cookies_seq_ops;
+extern struct timer_list fscache_cookie_lru_timer;
extern void fscache_print_cookie(struct fscache_cookie *cookie, char prefix);
extern bool fscache_begin_cookie_access(struct fscache_cookie *cookie,
@@ -70,6 +71,10 @@ extern atomic_t fscache_n_volumes;
extern atomic_t fscache_n_volumes_collision;
extern atomic_t fscache_n_volumes_nomem;
extern atomic_t fscache_n_cookies;
+extern atomic_t fscache_n_cookies_lru;
+extern atomic_t fscache_n_cookies_lru_expired;
+extern atomic_t fscache_n_cookies_lru_removed;
+extern atomic_t fscache_n_cookies_lru_dropped;
extern atomic_t fscache_n_acquires;
extern atomic_t fscache_n_acquires_null;
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index fd2bd08c1ecb..17bf57374595 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -17,6 +17,10 @@ atomic_t fscache_n_volumes;
atomic_t fscache_n_volumes_collision;
atomic_t fscache_n_volumes_nomem;
atomic_t fscache_n_cookies;
+atomic_t fscache_n_cookies_lru;
+atomic_t fscache_n_cookies_lru_expired;
+atomic_t fscache_n_cookies_lru_removed;
+atomic_t fscache_n_cookies_lru_dropped;
atomic_t fscache_n_acquires;
atomic_t fscache_n_acquires_null;
@@ -51,6 +55,14 @@ int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_acquires_ok),
atomic_read(&fscache_n_acquires_oom));
+ seq_printf(m, "LRU : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
+ atomic_read(&fscache_n_cookies_lru),
+ atomic_read(&fscache_n_cookies_lru_expired),
+ atomic_read(&fscache_n_cookies_lru_removed),
+ atomic_read(&fscache_n_cookies_lru_dropped),
+ timer_pending(&fscache_cookie_lru_timer) ?
+ fscache_cookie_lru_timer.expires - jiffies : 0);
+
seq_printf(m, "Updates: n=%u\n",
atomic_read(&fscache_n_updates));
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index f6d63dc0ffa9..a67c29207ad5 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -132,6 +132,20 @@ static inline void *fscache_get_key(struct fscache_cookie *cookie)
return cookie->key;
}
+/**
+ * fscache_cookie_lookup_negative - Note negative lookup
+ * @cookie: The cookie that was being looked up
+ *
+ * Note that some part of the metadata path in the cache doesn't exist and so
+ * we can release any waiting readers in the certain knowledge that there's
+ * nothing for them to actually read.
+ */
+static inline void fscache_cookie_lookup_negative(struct fscache_cookie *cookie)
+{
+ set_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags);
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_CREATING);
+}
+
extern struct workqueue_struct *fscache_wq;
#endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index ebdc0fd1f309..df985507fa5e 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -27,11 +27,15 @@
#define fscache_available() (1)
#define fscache_volume_valid(volume) (volume)
#define fscache_cookie_valid(cookie) (cookie)
+#define fscache_resources_valid(cres) ((cres)->cache_priv)
+#define fscache_cookie_enabled(cookie) (cookie && !test_bit(FSCACHE_COOKIE_DISABLED, &cookie->flags))
#else
#define __fscache_available (0)
#define fscache_available() (0)
#define fscache_volume_valid(volume) (0)
#define fscache_cookie_valid(cookie) (0)
+#define fscache_resources_valid(cres) (false)
+#define fscache_cookie_enabled(cookie) (0)
#endif
struct fscache_cookie;
@@ -50,6 +54,7 @@ enum fscache_cookie_stage {
FSCACHE_COOKIE_STAGE_CREATING, /* The cache object is being created */
FSCACHE_COOKIE_STAGE_ACTIVE, /* The cache is active, readable and writable */
FSCACHE_COOKIE_STAGE_FAILED, /* The cache failed, withdraw to clear */
+ FSCACHE_COOKIE_STAGE_COMMITTING, /* The cookie is being committed */
FSCACHE_COOKIE_STAGE_WITHDRAWING, /* The cookie is being withdrawn */
FSCACHE_COOKIE_STAGE_RELINQUISHING, /* The cookie is being relinquished */
FSCACHE_COOKIE_STAGE_DROPPED, /* The cookie has been dropped */
@@ -150,6 +155,8 @@ extern struct fscache_cookie *__fscache_acquire_cookie(
const void *, size_t,
const void *, size_t,
loff_t);
+extern void __fscache_use_cookie(struct fscache_cookie *, bool);
+extern void __fscache_unuse_cookie(struct fscache_cookie *, const void *, const loff_t *);
extern void __fscache_relinquish_cookie(struct fscache_cookie *, bool);
/**
@@ -224,6 +231,39 @@ struct fscache_cookie *fscache_acquire_cookie(struct fscache_volume *volume,
object_size);
}
+/**
+ * fscache_use_cookie - Request usage of cookie attached to an object
+ * @object: Object description
+ * @will_modify: If cache is expected to be modified locally
+ *
+ * Request usage of the cookie attached to an object. The caller should tell
+ * the cache if the object's contents are about to be modified locally and then
+ * the cache can apply the policy that has been set to handle this case.
+ */
+static inline void fscache_use_cookie(struct fscache_cookie *cookie,
+ bool will_modify)
+{
+ if (fscache_cookie_valid(cookie))
+ __fscache_use_cookie(cookie, will_modify);
+}
+
+/**
+ * fscache_unuse_cookie - Cease usage of cookie attached to an object
+ * @object: Object description
+ * @aux_data: Updated auxiliary data (or NULL)
+ * @object_size: Revised size of the object (or NULL)
+ *
+ * Cease usage of the cookie attached to an object. When the users count
+ * reaches zero then the cookie relinquishment will be permitted to proceed.
+ */
+static inline void fscache_unuse_cookie(struct fscache_cookie *cookie,
+ const void *aux_data,
+ const loff_t *object_size)
+{
+ if (fscache_cookie_valid(cookie))
+ __fscache_unuse_cookie(cookie, aux_data, object_size);
+}
+
/**
* fscache_relinquish_cookie - Return the cookie to the cache, maybe discarding
* it
@@ -243,4 +283,46 @@ void fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
__fscache_relinquish_cookie(cookie, retire);
}
+/*
+ * Find the auxiliary data on a cookie.
+ */
+static inline void *fscache_get_aux(struct fscache_cookie *cookie)
+{
+ if (cookie->aux_len <= sizeof(cookie->inline_aux))
+ return cookie->inline_aux;
+ else
+ return cookie->aux;
+}
+
+/*
+ * Update the auxiliary data on a cookie.
+ */
+static inline
+void fscache_update_aux(struct fscache_cookie *cookie,
+ const void *aux_data, const loff_t *object_size)
+{
+ void *p = fscache_get_aux(cookie);
+
+ if (aux_data && p)
+ memcpy(p, aux_data, cookie->aux_len);
+ if (object_size)
+ cookie->object_size = *object_size;
+}
+
+#ifdef CONFIG_FSCACHE_STATS
+extern atomic_t fscache_n_updates;
+#endif
+
+static inline
+void __fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data,
+ const loff_t *object_size)
+{
+#ifdef CONFIG_FSCACHE_STATS
+ atomic_inc(&fscache_n_updates);
+#endif
+ fscache_update_aux(cookie, aux_data, object_size);
+ smp_wmb();
+ set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
+}
+
#endif /* _LINUX_FSCACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 00ffe0f8e6d3..2b31ef34efa2 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -50,13 +50,18 @@ enum fscache_cookie_trace {
fscache_cookie_discard,
fscache_cookie_get_end_access,
fscache_cookie_get_hash_collision,
+ fscache_cookie_get_lru,
+ fscache_cookie_get_use_work,
fscache_cookie_new_acquire,
fscache_cookie_put_hash_collision,
+ fscache_cookie_put_lru,
fscache_cookie_put_over_queued,
fscache_cookie_put_relinquish,
fscache_cookie_put_withdrawn,
fscache_cookie_put_work,
fscache_cookie_see_active,
+ fscache_cookie_see_lru_do_one,
+ fscache_cookie_see_committing,
fscache_cookie_see_relinquish,
fscache_cookie_see_withdraw,
fscache_cookie_see_work,
@@ -67,6 +72,7 @@ enum fscache_access_trace {
fscache_access_acquire_volume_end,
fscache_access_cache_pin,
fscache_access_cache_unpin,
+ fscache_access_lookup_cookie,
fscache_access_lookup_cookie_end,
fscache_access_relinquish_volume,
fscache_access_relinquish_volume_end,
@@ -107,13 +113,18 @@ enum fscache_access_trace {
EM(fscache_cookie_discard, "DISCARD ") \
EM(fscache_cookie_get_hash_collision, "GET hcoll") \
EM(fscache_cookie_get_end_access, "GQ endac") \
+ EM(fscache_cookie_get_lru, "GET lru ") \
+ EM(fscache_cookie_get_use_work, "GQ use ") \
EM(fscache_cookie_new_acquire, "NEW acq ") \
EM(fscache_cookie_put_hash_collision, "PUT hcoll") \
+ EM(fscache_cookie_put_lru, "PUT lru ") \
EM(fscache_cookie_put_over_queued, "PQ overq") \
EM(fscache_cookie_put_relinquish, "PUT relnq") \
EM(fscache_cookie_put_withdrawn, "PUT wthdn") \
EM(fscache_cookie_put_work, "PQ work ") \
EM(fscache_cookie_see_active, "- active") \
+ EM(fscache_cookie_see_lru_do_one, "- lrudo") \
+ EM(fscache_cookie_see_committing, "- x-cmt") \
EM(fscache_cookie_see_relinquish, "- x-rlq") \
EM(fscache_cookie_see_withdraw, "- x-wth") \
E_(fscache_cookie_see_work, "- work ")
@@ -123,6 +134,7 @@ enum fscache_access_trace {
EM(fscache_access_acquire_volume_end, "END acq_vol") \
EM(fscache_access_cache_pin, "PIN cache ") \
EM(fscache_access_cache_unpin, "UNPIN cache ") \
+ EM(fscache_access_lookup_cookie, "BEGIN lookup ") \
EM(fscache_access_lookup_cookie_end, "END lookup ") \
EM(fscache_access_relinquish_volume, "BEGIN rlq_vol") \
EM(fscache_access_relinquish_volume_end,"END rlq_vol") \
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 20/53] fscache: Implement cookie invalidation
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (18 preceding siblings ...)
2021-10-22 19:03 ` [PATCH v2 19/53] fscache: Implement cookie user counting and resource pinning David Howells
@ 2021-10-22 19:03 ` David Howells
2021-10-22 19:03 ` [PATCH v2 21/53] fscache: Provide a means to begin an operation David Howells
` (34 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:03 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add a function to invalidate the cache behind a cookie:
void fscache_invalidate(struct fscache_cookie *cookie,
const void *aux_data,
loff_t size,
unsigned int flags)
If there is one, any cached data for the specified cookie is discarded. If
the cookie is marked as being in use, a new cache object will be created if
possible and future I/O will use that instead. In-flight I/O will be
abandoned (writes) or reperformed (reads).
The coherency data attached to the cookie can be updated and the cookie
size should be reset. One flag is available, FSCACHE_INVAL_DIO_WRITE,
which should be used to indicate invalidation due to a DIO write on a
file. This will temporarily disable caching for this cookie.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/cookie.c | 72 +++++++++++++++++++++++++++++++++++++++-
fs/fscache/internal.h | 2 +
fs/fscache/stats.c | 5 +++
include/linux/fscache-cache.h | 3 ++
include/linux/fscache.h | 33 ++++++++++++++++++
include/linux/netfs.h | 1 +
include/trace/events/fscache.h | 25 ++++++++++++++
7 files changed, 140 insertions(+), 1 deletion(-)
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index cf987756534c..2ad889f20430 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -20,6 +20,7 @@ static void fscache_cookie_lru_worker(struct work_struct *work);
static void fscache_cookie_worker(struct work_struct *work);
static void fscache_drop_cookie(struct fscache_cookie *cookie);
static void fscache_lookup_cookie(struct fscache_cookie *cookie);
+static void fscache_invalidate_cookie(struct fscache_cookie *cookie);
#define fscache_cookie_hash_shift 15
static struct hlist_bl_head fscache_cookie_hash[1 << fscache_cookie_hash_shift];
@@ -29,7 +30,7 @@ static LIST_HEAD(fscache_cookie_lru);
static DEFINE_SPINLOCK(fscache_cookie_lru_lock);
DEFINE_TIMER(fscache_cookie_lru_timer, fscache_cookie_lru_timed_out);
static DECLARE_WORK(fscache_cookie_lru_work, fscache_cookie_lru_worker);
-static const char fscache_cookie_stages[FSCACHE_COOKIE_STAGE__NR] = "-LCAFMWRD";
+static const char fscache_cookie_stages[FSCACHE_COOKIE_STAGE__NR] = "-LCAIFMWRD";
unsigned int fscache_lru_cookie_timeout = 10 * HZ;
void fscache_print_cookie(struct fscache_cookie *cookie, char prefix)
@@ -504,6 +505,7 @@ void __fscache_use_cookie(struct fscache_cookie *cookie, bool will_modify)
set_bit(FSCACHE_COOKIE_LOCAL_WRITE, &cookie->flags);
break;
case FSCACHE_COOKIE_STAGE_ACTIVE:
+ case FSCACHE_COOKIE_STAGE_INVALIDATING:
if (will_modify &&
!test_and_set_bit(FSCACHE_COOKIE_LOCAL_WRITE, &cookie->flags)) {
set_bit(FSCACHE_COOKIE_DO_PREP_TO_WRITE, &cookie->flags);
@@ -598,6 +600,10 @@ static void __fscache_cookie_worker(struct fscache_cookie *cookie)
cookie->debug_id, cookie->stage);
break;
+ case FSCACHE_COOKIE_STAGE_INVALIDATING:
+ fscache_invalidate_cookie(cookie);
+ goto again;
+
case FSCACHE_COOKIE_STAGE_FAILED:
break;
@@ -723,6 +729,70 @@ static void fscache_cookie_drop_from_lru(struct fscache_cookie *cookie)
}
}
+/*
+ * Ask the cache to effect invalidation of a cookie.
+ */
+static void fscache_invalidate_cookie(struct fscache_cookie *cookie)
+{
+ cookie->volume->cache->ops->invalidate_cookie(cookie);
+ fscache_end_cookie_access(cookie, fscache_access_invalidate_cookie_end);
+}
+
+/*
+ * Invalidate an object.
+ */
+void __fscache_invalidate(struct fscache_cookie *cookie,
+ const void *aux_data, loff_t new_size,
+ unsigned int flags)
+{
+ bool is_caching;
+
+ _enter("c=%x", cookie->debug_id);
+
+ fscache_stat(&fscache_n_invalidates);
+
+ if (WARN(test_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags),
+ "Trying to invalidate relinquished cookie\n"))
+ return;
+
+ if ((flags & FSCACHE_INVAL_DIO_WRITE) &&
+ test_and_set_bit(FSCACHE_COOKIE_DISABLED, &cookie->flags))
+ return;
+
+ spin_lock(&cookie->lock);
+ set_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags);
+ fscache_update_aux(cookie, aux_data, &new_size);
+ cookie->inval_counter++;
+ trace_fscache_invalidate(cookie, new_size);
+
+ switch (cookie->stage) {
+ case FSCACHE_COOKIE_STAGE_INVALIDATING: /* is_still_valid will catch it */
+ default:
+ spin_unlock(&cookie->lock);
+ _leave(" [no %u]", cookie->stage);
+ return;
+
+ case FSCACHE_COOKIE_STAGE_LOOKING_UP:
+ case FSCACHE_COOKIE_STAGE_CREATING:
+ spin_unlock(&cookie->lock);
+ _leave(" [look %x]", cookie->inval_counter);
+ return;
+
+ case FSCACHE_COOKIE_STAGE_ACTIVE:
+ __fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_INVALIDATING);
+ is_caching = fscache_begin_cookie_access(
+ cookie, fscache_access_invalidate_cookie);
+ spin_unlock(&cookie->lock);
+ wake_up_cookie_stage(cookie);
+
+ if (is_caching)
+ fscache_queue_cookie(cookie, fscache_cookie_get_inval_work);
+ _leave(" [inv]");
+ return;
+ }
+}
+EXPORT_SYMBOL(__fscache_invalidate);
+
/*
* Remove a cookie from the hash table.
*/
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 5aff9c143616..4c45d2af7160 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -82,6 +82,8 @@ extern atomic_t fscache_n_acquires_no_cache;
extern atomic_t fscache_n_acquires_ok;
extern atomic_t fscache_n_acquires_oom;
+extern atomic_t fscache_n_invalidates;
+
extern atomic_t fscache_n_relinquishes;
extern atomic_t fscache_n_relinquishes_retire;
extern atomic_t fscache_n_relinquishes_dropped;
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 17bf57374595..45b7636c7737 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -28,6 +28,8 @@ atomic_t fscache_n_acquires_no_cache;
atomic_t fscache_n_acquires_ok;
atomic_t fscache_n_acquires_oom;
+atomic_t fscache_n_invalidates;
+
atomic_t fscache_n_updates;
EXPORT_SYMBOL(fscache_n_updates);
@@ -63,6 +65,9 @@ int fscache_stats_show(struct seq_file *m, void *v)
timer_pending(&fscache_cookie_lru_timer) ?
fscache_cookie_lru_timer.expires - jiffies : 0);
+ seq_printf(m, "Invals : n=%u\n",
+ atomic_read(&fscache_n_invalidates));
+
seq_printf(m, "Updates: n=%u\n",
atomic_read(&fscache_n_updates));
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index a67c29207ad5..46d77a1840cd 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -66,6 +66,9 @@ struct fscache_cache_ops {
/* Withdraw an object without any cookie access counts held */
void (*withdraw_cookie)(struct fscache_cookie *cookie);
+ /* Invalidate an object */
+ bool (*invalidate_cookie)(struct fscache_cookie *cookie);
+
/* Prepare to write to a live cache object */
void (*prepare_to_write)(struct fscache_cookie *cookie);
};
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index df985507fa5e..0b01eaaef44c 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -45,6 +45,8 @@ struct fscache_cookie;
#define FSCACHE_ADV_WRITE_NOCACHE 0x02 /* Don't cache if written to locally */
#define FSCACHE_ADV_FALLBACK_IO 0x04 /* Going to use the fallback I/O API (dangerous) */
+#define FSCACHE_INVAL_DIO_WRITE 0x01 /* Invalidate due to DIO write */
+
/*
* Data object state.
*/
@@ -53,6 +55,7 @@ enum fscache_cookie_stage {
FSCACHE_COOKIE_STAGE_LOOKING_UP, /* The cache object is being looked up */
FSCACHE_COOKIE_STAGE_CREATING, /* The cache object is being created */
FSCACHE_COOKIE_STAGE_ACTIVE, /* The cache is active, readable and writable */
+ FSCACHE_COOKIE_STAGE_INVALIDATING, /* The cache is being invalidated */
FSCACHE_COOKIE_STAGE_FAILED, /* The cache failed, withdraw to clear */
FSCACHE_COOKIE_STAGE_COMMITTING, /* The cookie is being committed */
FSCACHE_COOKIE_STAGE_WITHDRAWING, /* The cookie is being withdrawn */
@@ -158,6 +161,7 @@ extern struct fscache_cookie *__fscache_acquire_cookie(
extern void __fscache_use_cookie(struct fscache_cookie *, bool);
extern void __fscache_unuse_cookie(struct fscache_cookie *, const void *, const loff_t *);
extern void __fscache_relinquish_cookie(struct fscache_cookie *, bool);
+extern void __fscache_invalidate(struct fscache_cookie *, const void *, loff_t, unsigned int);
/**
* fscache_acquire_volume - Register a volume as desiring caching services
@@ -325,4 +329,33 @@ void __fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data
set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
}
+/**
+ * fscache_invalidate - Notify cache that an object needs invalidation
+ * @cookie: The cookie representing the cache object
+ * @aux_data: The updated auxiliary data for the cookie (may be NULL)
+ * @size: The revised size of the object.
+ * @flags: Invalidation flags (FSCACHE_INVAL_*)
+ *
+ * Notify the cache that an object is needs to be invalidated and that it
+ * should abort any retrievals or stores it is doing on the cache. The object
+ * is then marked non-caching until such time as the invalidation is complete.
+ *
+ * FSCACHE_INVAL_LIGHT indicates that if the object has been invalidated and
+ * replaced by a temporary object, the temporary object need not be replaced
+ * again. This is primarily intended for use with FSCACHE_ADV_SINGLE_CHUNK.
+ *
+ * FSCACHE_INVAL_DIO_WRITE indicates that this is due to a direct I/O write and
+ * may cause caching to be suspended on this cookie.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_invalidate(struct fscache_cookie *cookie,
+ const void *aux_data, loff_t size, unsigned int flags)
+{
+ if (fscache_cookie_enabled(cookie))
+ __fscache_invalidate(cookie, aux_data, size, flags);
+}
+
#endif /* _LINUX_FSCACHE_H */
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 99137486d351..3c70eef56599 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -103,6 +103,7 @@ struct netfs_cache_resources {
void *cache_priv;
void *cache_priv2;
unsigned int debug_id; /* Cookie debug ID */
+ unsigned int inval_counter; /* object->inval_counter at begin_op */
};
/*
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 2b31ef34efa2..b705ff36bddc 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -50,6 +50,7 @@ enum fscache_cookie_trace {
fscache_cookie_discard,
fscache_cookie_get_end_access,
fscache_cookie_get_hash_collision,
+ fscache_cookie_get_inval_work,
fscache_cookie_get_lru,
fscache_cookie_get_use_work,
fscache_cookie_new_acquire,
@@ -72,6 +73,8 @@ enum fscache_access_trace {
fscache_access_acquire_volume_end,
fscache_access_cache_pin,
fscache_access_cache_unpin,
+ fscache_access_invalidate_cookie,
+ fscache_access_invalidate_cookie_end,
fscache_access_lookup_cookie,
fscache_access_lookup_cookie_end,
fscache_access_relinquish_volume,
@@ -113,6 +116,7 @@ enum fscache_access_trace {
EM(fscache_cookie_discard, "DISCARD ") \
EM(fscache_cookie_get_hash_collision, "GET hcoll") \
EM(fscache_cookie_get_end_access, "GQ endac") \
+ EM(fscache_cookie_get_inval_work, "GQ inval") \
EM(fscache_cookie_get_lru, "GET lru ") \
EM(fscache_cookie_get_use_work, "GQ use ") \
EM(fscache_cookie_new_acquire, "NEW acq ") \
@@ -134,6 +138,8 @@ enum fscache_access_trace {
EM(fscache_access_acquire_volume_end, "END acq_vol") \
EM(fscache_access_cache_pin, "PIN cache ") \
EM(fscache_access_cache_unpin, "UNPIN cache ") \
+ EM(fscache_access_invalidate_cookie, "BEGIN inval ") \
+ EM(fscache_access_invalidate_cookie_end,"END inval ") \
EM(fscache_access_lookup_cookie, "BEGIN lookup ") \
EM(fscache_access_lookup_cookie_end, "END lookup ") \
EM(fscache_access_relinquish_volume, "BEGIN rlq_vol") \
@@ -378,6 +384,25 @@ TRACE_EVENT(fscache_relinquish,
__entry->n_active, __entry->flags, __entry->retire)
);
+TRACE_EVENT(fscache_invalidate,
+ TP_PROTO(struct fscache_cookie *cookie, loff_t new_size),
+
+ TP_ARGS(cookie, new_size),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(loff_t, new_size )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->new_size = new_size;
+ ),
+
+ TP_printk("c=%08x sz=%llx",
+ __entry->cookie, __entry->new_size)
+ );
+
#endif /* _TRACE_FSCACHE_H */
/* This part must be outside protection */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 21/53] fscache: Provide a means to begin an operation
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (19 preceding siblings ...)
2021-10-22 19:03 ` [PATCH v2 20/53] fscache: Implement cookie invalidation David Howells
@ 2021-10-22 19:03 ` David Howells
2021-10-22 19:04 ` [PATCH v2 22/53] fscache: Provide read/write stat counters for the cache David Howells
` (33 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:03 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide a function to begin a read operation:
int fscache_begin_read_operation(
struct netfs_cache_resources *cres,
struct fscache_cookie *cookie)
This may be called by the network filesystem on behalf of netfslib, but may
also be called to use the I/O access functions directly. It attaches the
resources required by the cache to cres struct from the supplied cookie.
This holds access to the cache behind the cookie for the duration of the
operation and forces cache withdrawal and cookie invalidation to perform
some sort of synchronisation on the operation.
Note that this does not guarantee that the cache state is fully set up and
able to perform I/O immediately; looking up and creation may be left
proceeding in the background. The operations intended to be called by the
network filesystem, such as reading and writing, are expected to wait for
the cookie to move to the correct state.
This will, however, potentially sleep, waiting for a certain minimum state
to be set or for operations such as invalidate to advance far enough that
I/O can resume.
A function is also provided for the cache to call to wait for the cache
object to get to a state where it can be used for certain things:
bool fscache_wait_for_operation(struct netfs_cache_resources *cres,
enum fscache_want_stage stage);
This looks at the cache resources provided by the begin function and waits
for them to get to an appropriate stage. There's a choice of wanting just
some parameters (FSCACHE_WANT_PARAM) or the ability to do I/O
(FSCACHE_WANT_READ or FSCACHE_WANT_WRITE).
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/Makefile | 1
fs/fscache/io.c | 152 ++++++++++++++++++++++++++++++++++++++++
include/linux/fscache-cache.h | 23 ++++++
include/linux/fscache.h | 51 +++++++++++++
include/trace/events/fscache.h | 6 ++
5 files changed, 233 insertions(+)
create mode 100644 fs/fscache/io.c
diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile
index bcc79615f93a..afb090ea16c4 100644
--- a/fs/fscache/Makefile
+++ b/fs/fscache/Makefile
@@ -6,6 +6,7 @@
fscache-y := \
cache.o \
cookie.o \
+ io.o \
main.o \
volume.o
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
new file mode 100644
index 000000000000..9c747069b923
--- /dev/null
+++ b/fs/fscache/io.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Cache data I/O routines
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#define FSCACHE_DEBUG_LEVEL OPERATION
+#define FSCACHE_USE_NEW_IO_API
+#define FSCACHE_USE_FALLBACK_IO_API
+#include <linux/fscache-cache.h>
+#include <linux/uio.h>
+#include <linux/bvec.h>
+#include <linux/slab.h>
+#include <linux/uio.h>
+#include "internal.h"
+
+/**
+ * fscache_wait_for_operation - Wait for an object become accessible
+ * @cres: The cache resources for the operation being performed
+ * @want_stage: The minimum stage the object must be at
+ *
+ * See if the target cache object is at the specified minimum stage of
+ * accessibility yet, and if not, wait for it.
+ */
+bool fscache_wait_for_operation(struct netfs_cache_resources *cres,
+ enum fscache_want_stage want_stage)
+{
+ struct fscache_cookie *cookie = fscache_cres_cookie(cres);
+ enum fscache_cookie_stage stage;
+
+again:
+ if (!fscache_cache_is_live(cookie->volume->cache)) {
+ _leave(" [broken]");
+ return false;
+ }
+
+ stage = READ_ONCE(cookie->stage);
+ _enter("c=%08x{%u},%x", cookie->debug_id, stage, want_stage);
+
+ switch (stage) {
+ case FSCACHE_COOKIE_STAGE_CREATING:
+ case FSCACHE_COOKIE_STAGE_INVALIDATING:
+ if (want_stage == FSCACHE_WANT_PARAMS)
+ goto ready; /* There can be no content */
+ fallthrough;
+ case FSCACHE_COOKIE_STAGE_LOOKING_UP:
+ case FSCACHE_COOKIE_STAGE_COMMITTING:
+ wait_var_event(&cookie->stage, READ_ONCE(cookie->stage) != stage);
+ goto again;
+
+ case FSCACHE_COOKIE_STAGE_ACTIVE:
+ goto ready;
+ case FSCACHE_COOKIE_STAGE_DROPPED:
+ case FSCACHE_COOKIE_STAGE_RELINQUISHING:
+ default:
+ _leave(" [not live]");
+ return false;
+ }
+
+ready:
+ if (!cres->cache_priv2)
+ return cookie->volume->cache->ops->begin_operation(cres, want_stage);
+ return true;
+}
+EXPORT_SYMBOL(fscache_wait_for_operation);
+
+/*
+ * Begin an I/O operation on the cache, waiting till we reach the right state.
+ *
+ * Attaches the resources required to the operation resources record.
+ */
+static int fscache_begin_operation(struct netfs_cache_resources *cres,
+ struct fscache_cookie *cookie,
+ enum fscache_want_stage want_stage,
+ enum fscache_access_trace why)
+{
+ enum fscache_cookie_stage stage;
+ long timeo;
+ bool once_only = false;
+
+ cres->ops = NULL;
+ cres->cache_priv = cookie;
+ cres->cache_priv2 = NULL;
+ cres->debug_id = cookie->debug_id;
+ cres->inval_counter = cookie->inval_counter;
+
+ if (!fscache_begin_cookie_access(cookie, why))
+ return -ENOBUFS;
+
+again:
+ spin_lock(&cookie->lock);
+
+ stage = cookie->stage;
+ _enter("c=%08x{%u},%x", cookie->debug_id, stage, want_stage);
+
+ switch (stage) {
+ case FSCACHE_COOKIE_STAGE_LOOKING_UP:
+ case FSCACHE_COOKIE_STAGE_COMMITTING:
+ goto wait_and_validate;
+ case FSCACHE_COOKIE_STAGE_INVALIDATING:
+ case FSCACHE_COOKIE_STAGE_CREATING:
+ if (want_stage == FSCACHE_WANT_PARAMS)
+ goto ready; /* There can be no content */
+ goto wait_and_validate;
+ case FSCACHE_COOKIE_STAGE_ACTIVE:
+ goto ready;
+ case FSCACHE_COOKIE_STAGE_DROPPED:
+ case FSCACHE_COOKIE_STAGE_RELINQUISHING:
+ WARN(1, "Can't use cookie in stage %u\n", cookie->stage);
+ goto not_live;
+ default:
+ goto not_live;
+ }
+
+ready:
+ spin_unlock(&cookie->lock);
+ if (!cookie->volume->cache->ops->begin_operation(cres, want_stage))
+ goto failed;
+ return 0;
+
+wait_and_validate:
+ spin_unlock(&cookie->lock);
+ trace_fscache_access(cookie->debug_id, refcount_read(&cookie->ref),
+ atomic_read(&cookie->n_accesses),
+ fscache_access_io_wait);
+ timeo = wait_var_event_timeout(&cookie->stage,
+ READ_ONCE(cookie->stage) != stage, 20 * HZ);
+ if (timeo <= 1 && !once_only) {
+ pr_warn("%s: cookie stage change wait timed out: cookie->stage=%u stage=%u",
+ __func__, READ_ONCE(cookie->stage), stage);
+ fscache_print_cookie(cookie, 'O');
+ once_only = true;
+ }
+ goto again;
+
+not_live:
+ spin_unlock(&cookie->lock);
+failed:
+ cres->cache_priv = NULL;
+ cres->ops = NULL;
+ fscache_end_cookie_access(cookie, fscache_access_io_not_live);
+ _leave(" = -ENOBUFS");
+ return -ENOBUFS;
+}
+
+int __fscache_begin_read_operation(struct netfs_cache_resources *cres,
+ struct fscache_cookie *cookie)
+{
+ return fscache_begin_operation(cres, cookie, FSCACHE_WANT_PARAMS,
+ fscache_access_io_read);
+}
+EXPORT_SYMBOL(__fscache_begin_read_operation);
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 46d77a1840cd..2d57b85cfde3 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -69,6 +69,10 @@ struct fscache_cache_ops {
/* Invalidate an object */
bool (*invalidate_cookie)(struct fscache_cookie *cookie);
+ /* Begin an operation for the netfs lib */
+ bool (*begin_operation)(struct netfs_cache_resources *cres,
+ enum fscache_want_stage want_stage);
+
/* Prepare to write to a live cache object */
void (*prepare_to_write)(struct fscache_cookie *cookie);
};
@@ -123,6 +127,8 @@ extern void fscache_end_cookie_access(struct fscache_cookie *cookie,
enum fscache_access_trace why);
extern void fscache_set_cookie_stage(struct fscache_cookie *cookie,
enum fscache_cookie_stage stage);
+extern bool fscache_wait_for_operation(struct netfs_cache_resources *cred,
+ enum fscache_want_stage stage);
/*
* Find the key on a cookie.
@@ -149,6 +155,23 @@ static inline void fscache_cookie_lookup_negative(struct fscache_cookie *cookie)
fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_CREATING);
}
+static inline struct fscache_cookie *fscache_cres_cookie(struct netfs_cache_resources *cres)
+{
+ return cres->cache_priv;
+}
+
+/**
+ * fscache_end_operation - End an fscache I/O operation.
+ * @cres: The resources to dispose of.
+ */
+static inline
+void fscache_end_operation(struct netfs_cache_resources *cres)
+{
+ const struct netfs_cache_ops *ops = fscache_operation_valid(cres);
+ if (ops)
+ ops->end_operation(cres);
+}
+
extern struct workqueue_struct *fscache_wq;
#endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 0b01eaaef44c..ba55717f81ca 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -47,6 +47,12 @@ struct fscache_cookie;
#define FSCACHE_INVAL_DIO_WRITE 0x01 /* Invalidate due to DIO write */
+enum fscache_want_stage {
+ FSCACHE_WANT_PARAMS,
+ FSCACHE_WANT_WRITE,
+ FSCACHE_WANT_READ,
+};
+
/*
* Data object state.
*/
@@ -162,6 +168,9 @@ extern void __fscache_use_cookie(struct fscache_cookie *, bool);
extern void __fscache_unuse_cookie(struct fscache_cookie *, const void *, const loff_t *);
extern void __fscache_relinquish_cookie(struct fscache_cookie *, bool);
extern void __fscache_invalidate(struct fscache_cookie *, const void *, loff_t, unsigned int);
+#ifdef FSCACHE_USE_NEW_IO_API
+extern int __fscache_begin_read_operation(struct netfs_cache_resources *, struct fscache_cookie *);
+#endif
/**
* fscache_acquire_volume - Register a volume as desiring caching services
@@ -358,4 +367,46 @@ void fscache_invalidate(struct fscache_cookie *cookie,
__fscache_invalidate(cookie, aux_data, size, flags);
}
+/**
+ * fscache_operation_valid - Return true if operations resources are usable
+ * @cres: The resources to check.
+ *
+ * Returns a pointer to the operations table if usable or NULL if not.
+ */
+static inline
+const struct netfs_cache_ops *fscache_operation_valid(const struct netfs_cache_resources *cres)
+{
+ return fscache_resources_valid(cres) ? cres->ops : NULL;
+}
+
+#ifdef FSCACHE_USE_NEW_IO_API
+
+/**
+ * fscache_begin_read_operation - Begin a read operation for the netfs lib
+ * @cres: The cache resources for the read being performed
+ * @cookie: The cookie representing the cache object
+ *
+ * Begin a read operation on behalf of the netfs helper library. @cres
+ * indicates the cache resources to which the operation state should be
+ * attached; @cookie indicates the cache object that will be accessed.
+ *
+ * This is intended to be called from the ->begin_cache_operation() netfs lib
+ * operation as implemented by the network filesystem.
+ *
+ * Returns:
+ * * 0 - Success
+ * * -ENOBUFS - No caching available
+ * * Other error code from the cache, such as -ENOMEM.
+ */
+static inline
+int fscache_begin_read_operation(struct netfs_cache_resources *cres,
+ struct fscache_cookie *cookie)
+{
+ if (fscache_cookie_enabled(cookie))
+ return __fscache_begin_read_operation(cres, cookie);
+ return -ENOBUFS;
+}
+
+#endif /* FSCACHE_USE_NEW_IO_API */
+
#endif /* _LINUX_FSCACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index b705ff36bddc..4ccaf4490b1b 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -75,6 +75,9 @@ enum fscache_access_trace {
fscache_access_cache_unpin,
fscache_access_invalidate_cookie,
fscache_access_invalidate_cookie_end,
+ fscache_access_io_not_live,
+ fscache_access_io_read,
+ fscache_access_io_wait,
fscache_access_lookup_cookie,
fscache_access_lookup_cookie_end,
fscache_access_relinquish_volume,
@@ -140,6 +143,9 @@ enum fscache_access_trace {
EM(fscache_access_cache_unpin, "UNPIN cache ") \
EM(fscache_access_invalidate_cookie, "BEGIN inval ") \
EM(fscache_access_invalidate_cookie_end,"END inval ") \
+ EM(fscache_access_io_not_live, "END io_notl") \
+ EM(fscache_access_io_read, "BEGIN io_read") \
+ EM(fscache_access_io_wait, "WAIT io ") \
EM(fscache_access_lookup_cookie, "BEGIN lookup ") \
EM(fscache_access_lookup_cookie_end, "END lookup ") \
EM(fscache_access_relinquish_volume, "BEGIN rlq_vol") \
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 22/53] fscache: Provide read/write stat counters for the cache
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (20 preceding siblings ...)
2021-10-22 19:03 ` [PATCH v2 21/53] fscache: Provide a means to begin an operation David Howells
@ 2021-10-22 19:04 ` David Howells
2021-10-22 19:04 ` [PATCH v2 23/53] fscache: Provide a function to let the netfs update its coherency data David Howells
` (32 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:04 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide read/write stat counters for the cache backend to use.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/stats.c | 9 +++++++++
include/linux/fscache-cache.h | 10 ++++++++++
2 files changed, 19 insertions(+)
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 45b7636c7737..8d5ad6771498 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -37,6 +37,11 @@ atomic_t fscache_n_relinquishes;
atomic_t fscache_n_relinquishes_retire;
atomic_t fscache_n_relinquishes_dropped;
+atomic_t fscache_n_read;
+EXPORT_SYMBOL(fscache_n_read);
+atomic_t fscache_n_write;
+EXPORT_SYMBOL(fscache_n_write);
+
/*
* display the general statistics
*/
@@ -76,6 +81,10 @@ int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_relinquishes_retire),
atomic_read(&fscache_n_relinquishes_dropped));
+ seq_printf(m, "IO : rd=%u wr=%u\n",
+ atomic_read(&fscache_n_read),
+ atomic_read(&fscache_n_write));
+
netfs_stats_show(m);
return 0;
}
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 2d57b85cfde3..6830f91ebaf4 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -172,6 +172,16 @@ void fscache_end_operation(struct netfs_cache_resources *cres)
ops->end_operation(cres);
}
+#ifdef CONFIG_FSCACHE_STATS
+extern atomic_t fscache_n_read;
+extern atomic_t fscache_n_write;
+#define fscache_count_read() atomic_inc(&fscache_n_read)
+#define fscache_count_write() atomic_inc(&fscache_n_write)
+#else
+#define fscache_count_read() do {} while(0)
+#define fscache_count_write() do {} while(0)
+#endif
+
extern struct workqueue_struct *fscache_wq;
#endif /* _LINUX_FSCACHE_CACHE_H */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 23/53] fscache: Provide a function to let the netfs update its coherency data
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (21 preceding siblings ...)
2021-10-22 19:04 ` [PATCH v2 22/53] fscache: Provide read/write stat counters for the cache David Howells
@ 2021-10-22 19:04 ` David Howells
2021-10-22 19:04 ` [PATCH v2 24/53] fscache: Implement I/O interface David Howells
` (31 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:04 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide a function to let the netfs update its coherency data:
void fscache_update_cookie(struct fscache_cookie *cookie,
const void *aux_data,
const loff_t *object_size);
This will update the auxiliary data and/or the size of the object attached
to a cookie if either pointer is not-NULL and flag that the disk needs to
be updated.
Note that fscache_unuse_cookie() also allows this to be done.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
include/linux/fscache.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index ba55717f81ca..f24604f0f818 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -338,6 +338,28 @@ void __fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data
set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
}
+/**
+ * fscache_update_cookie - Request that a cache object be updated
+ * @cookie: The cookie representing the cache object
+ * @aux_data: The updated auxiliary data for the cookie (may be NULL)
+ * @object_size: The current size of the object (may be NULL)
+ *
+ * Request an update of the index data for the cache object associated with the
+ * cookie. The auxiliary data on the cookie will be updated first if @aux_data
+ * is set and the object size will be updated and the object possibly trimmed
+ * if @object_size is set.
+ *
+ * See Documentation/filesystems/caching/netfs-api.rst for a complete
+ * description.
+ */
+static inline
+void fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data,
+ const loff_t *object_size)
+{
+ if (fscache_cookie_enabled(cookie))
+ __fscache_update_cookie(cookie, aux_data, object_size);
+}
+
/**
* fscache_invalidate - Notify cache that an object needs invalidation
* @cookie: The cookie representing the cache object
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 24/53] fscache: Implement I/O interface
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (22 preceding siblings ...)
2021-10-22 19:04 ` [PATCH v2 23/53] fscache: Provide a function to let the netfs update its coherency data David Howells
@ 2021-10-22 19:04 ` David Howells
2021-10-22 19:04 ` [PATCH v2 25/53] fscache: Provide fallback I/O functions David Howells
` (30 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:04 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide three functions to perform I/O to the cache and a helper function
for use with them.
The first function allows an arbitrary asynchronous direct-IO read to be
made against a cache object, though the read should be aligned and sized
appropriately for the backing device:
int fscache_read(struct netfs_cache_resources *cres,
loff_t start_pos,
struct iov_iter *iter,
enum netfs_read_from_hole read_hole,
netfs_io_terminated_t term_func,
void *term_func_priv);
The cache resources must have been previously initialised by
fscache_begin_read_operation(). A read operation is sent to the backing
filesystem, starting at start_pos within the file. The size of the read is
specified by the iterator, as is the location of the output buffer.
If there is a hole in the data it can be ignored (NETFS_READ_HOLE_IGNORE)
and the data padded with zeros, the area of the read can be excised
(NETFS_READ_HOLE_CLEAR) or -ENODATA can be given (NETFS_READ_HOLE_FAIL).
If term_func is given, the operation may be done asynchronously; in such a
case (*term_func)() will be called upon completion, successful or
otherwise, of the I/O operation and passed term_func_priv. If the op is
asynchronous and doesn't complete before this returns, -EIOCBQUEUED will be
returned.
The second function allows an arbitrary asynchronous direct-IO write to be
made against a cache object, though the write should be aligned and sized
appropriately for the backing device:
int fscache_write(struct netfs_cache_resources *cres,
loff_t start_pos,
struct iov_iter *iter,
netfs_io_terminated_t term_func,
void *term_func_priv);
This works in very similar way to fscache_read(), except that there's no
need to deal with holes (they're just overwritten).
The third function is a bit higher level than that and allows a write to be
made from the pagecache of an inode:
void fscache_write_to_cache(struct fscache_cookie *cookie,
struct address_space *mapping,
loff_t start,
size_t len,
loff_t i_size,
netfs_io_terminated_t term_func,
void *term_func_priv);
If cookie is NULL, this function does nothing except call (*term_func)() if
given. It assumes that, in such a case, PG_fscache will not have been set
on the pages.
Otherwise, this function requires the pages to be written from to have
PG_fscache set on them before it is called. start and len define the
region of the file to be modified and i_size indicates the new file size.
The source data is expected to be on pages attached to mapping.
term_func and term_func_priv work as for fscache_write(). The PG_fscache
bits will be set at the end of the operation, before term_func is called or
the function otherwise returns.
There is an additonal helper function to clear the PG_fscache bits from a
range of pages:
void fscache_clear_page_bits(struct fscache_cookie *cookie,
struct address_space *mapping,
loff_t start, size_t len);
The pages to be modified are expected to be located on mapping in the range
defined by start and len. If cookie is NULL, it does nothing.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/io.c | 100 ++++++++++++++++++++++++++++++++
include/linux/fscache.h | 124 ++++++++++++++++++++++++++++++++++++++++
include/trace/events/fscache.h | 2 +
3 files changed, 226 insertions(+)
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
index 9c747069b923..0c74dbb91fea 100644
--- a/fs/fscache/io.c
+++ b/fs/fscache/io.c
@@ -150,3 +150,103 @@ int __fscache_begin_read_operation(struct netfs_cache_resources *cres,
fscache_access_io_read);
}
EXPORT_SYMBOL(__fscache_begin_read_operation);
+
+struct fscache_write_request {
+ struct netfs_cache_resources cache_resources;
+ struct address_space *mapping;
+ loff_t start;
+ size_t len;
+ netfs_io_terminated_t term_func;
+ void *term_func_priv;
+};
+
+void __fscache_clear_page_bits(struct address_space *mapping,
+ loff_t start, size_t len)
+{
+ pgoff_t first = start / PAGE_SIZE;
+ pgoff_t last = (start + len - 1) / PAGE_SIZE;
+ struct page *page;
+
+ if (len) {
+ XA_STATE(xas, &mapping->i_pages, first);
+
+ rcu_read_lock();
+ xas_for_each(&xas, page, last) {
+ end_page_fscache(page);
+ }
+ rcu_read_unlock();
+ }
+}
+EXPORT_SYMBOL(__fscache_clear_page_bits);
+
+/*
+ * Deal with the completion of writing the data to the cache.
+ */
+static void fscache_wreq_done(void *priv, ssize_t transferred_or_error,
+ bool was_async)
+{
+ struct fscache_write_request *wreq = priv;
+
+ fscache_clear_page_bits(fscache_cres_cookie(&wreq->cache_resources),
+ wreq->mapping, wreq->start, wreq->len);
+
+ if (wreq->term_func)
+ wreq->term_func(wreq->term_func_priv, transferred_or_error,
+ was_async);
+ fscache_end_operation(&wreq->cache_resources);
+ kfree(wreq);
+}
+
+void __fscache_write_to_cache(struct fscache_cookie *cookie,
+ struct address_space *mapping,
+ loff_t start, size_t len, loff_t i_size,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ struct fscache_write_request *wreq;
+ struct netfs_cache_resources *cres;
+ struct iov_iter iter;
+ int ret = -ENOBUFS;
+
+ if (!fscache_cookie_valid(cookie) || len == 0)
+ goto abandon;
+
+ _enter("%llx,%zx", start, len);
+
+ wreq = kzalloc(sizeof(struct fscache_write_request), GFP_NOFS);
+ if (!wreq)
+ goto abandon;
+ wreq->mapping = mapping;
+ wreq->start = start;
+ wreq->len = len;
+ wreq->term_func = term_func;
+ wreq->term_func_priv = term_func_priv;
+
+ cres = &wreq->cache_resources;
+ if (fscache_begin_operation(cres, cookie, FSCACHE_WANT_WRITE,
+ fscache_access_io_write) < 0)
+ goto abandon_free;
+
+ ret = cres->ops->prepare_write(cres, &start, &len, i_size, false);
+ if (ret < 0)
+ goto abandon_end;
+
+ /* TODO: Consider clearing page bits now for space the write isn't
+ * covering. This is more complicated than it appears when THPs are
+ * taken into account.
+ */
+
+ iov_iter_xarray(&iter, WRITE, &mapping->i_pages, start, len);
+ fscache_write(cres, start, &iter, fscache_wreq_done, wreq);
+ return;
+
+abandon_end:
+ return fscache_wreq_done(wreq, ret, false);
+abandon_free:
+ kfree(wreq);
+abandon:
+ fscache_clear_page_bits(cookie, mapping, start, len);
+ if (term_func)
+ term_func(term_func_priv, ret, false);
+}
+EXPORT_SYMBOL(__fscache_write_to_cache);
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index f24604f0f818..b3b625d0834c 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -172,6 +172,10 @@ extern void __fscache_invalidate(struct fscache_cookie *, const void *, loff_t,
extern int __fscache_begin_read_operation(struct netfs_cache_resources *, struct fscache_cookie *);
#endif
+extern void __fscache_write_to_cache(struct fscache_cookie *, struct address_space *,
+ loff_t, size_t, loff_t, netfs_io_terminated_t, void *);
+extern void __fscache_clear_page_bits(struct address_space *, loff_t, size_t);
+
/**
* fscache_acquire_volume - Register a volume as desiring caching services
* @volume_key: An identification string for the volume
@@ -429,6 +433,126 @@ int fscache_begin_read_operation(struct netfs_cache_resources *cres,
return -ENOBUFS;
}
+/**
+ * fscache_read - Start a read from the cache.
+ * @cres: The cache resources to use
+ * @start_pos: The beginning file offset in the cache file
+ * @iter: The buffer to fill - and also the length
+ * @read_hole: How to handle a hole in the data.
+ * @term_func: The function to call upon completion
+ * @term_func_priv: The private data for @term_func
+ *
+ * Start a read from the cache. @cres indicates the cache object to read from
+ * and must be obtained by a call to fscache_begin_operation() beforehand.
+ *
+ * The data is read into the iterator, @iter, and that also indicates the size
+ * of the operation. @start_pos is the start position in the file, though if
+ * @seek_data is set appropriately, the cache can use SEEK_DATA to find the
+ * next piece of data, writing zeros for the hole into the iterator.
+ *
+ * Upon termination of the operation, @term_func will be called and supplied
+ * with @term_func_priv plus the amount of data written, if successful, or the
+ * error code otherwise.
+ */
+static inline
+int fscache_read(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ enum netfs_read_from_hole read_hole,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ const struct netfs_cache_ops *ops = fscache_operation_valid(cres);
+ return ops->read(cres, start_pos, iter, read_hole,
+ term_func, term_func_priv);
+}
+
+/**
+ * fscache_write - Start a write to the cache.
+ * @cres: The cache resources to use
+ * @start_pos: The beginning file offset in the cache file
+ * @iter: The data to write - and also the length
+ * @term_func: The function to call upon completion
+ * @term_func_priv: The private data for @term_func
+ *
+ * Start a write to the cache. @cres indicates the cache object to write to and
+ * must be obtained by a call to fscache_begin_operation() beforehand.
+ *
+ * The data to be written is obtained from the iterator, @iter, and that also
+ * indicates the size of the operation. @start_pos is the start position in
+ * the file.
+ *
+ * Upon termination of the operation, @term_func will be called and supplied
+ * with @term_func_priv plus the amount of data written, if successful, or the
+ * error code otherwise.
+ */
+static inline
+int fscache_write(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ const struct netfs_cache_ops *ops = fscache_operation_valid(cres);
+ return ops->write(cres, start_pos, iter, term_func, term_func_priv);
+}
+
+/**
+ * fscache_clear_page_bits - Clear the PG_fscache bits from a set of pages
+ * @cookie: The cookie representing the cache object
+ * @mapping: The netfs inode to use as the source
+ * @start: The start position in @mapping
+ * @len: The amount of data to unlock
+ *
+ * Clear the PG_fscache flag from a sequence of pages and wake up anyone who's
+ * waiting.
+ */
+static inline void fscache_clear_page_bits(struct fscache_cookie *cookie,
+ struct address_space *mapping,
+ loff_t start, size_t len)
+{
+ if (fscache_cookie_valid(cookie))
+ __fscache_clear_page_bits(mapping, start, len);
+}
+
+/**
+ * fscache_write_to_cache - Save a write to the cache and clear PG_fscache
+ * @cookie: The cookie representing the cache object
+ * @mapping: The netfs inode to use as the source
+ * @start: The start position in @mapping
+ * @len: The amount of data to write back
+ * @i_size: The new size of the inode
+ * @term_func: The function to call upon completion
+ * @term_func_priv: The private data for @term_func
+ *
+ * Helper function for a netfs to write dirty data from an inode into the cache
+ * object that's backing it.
+ *
+ * @start and @len describe the range of the data. This does not need to be
+ * page-aligned, but to satisfy DIO requirements, the cache may expand it up to
+ * the page boundaries on either end. All the pages covering the range must be
+ * marked with PG_fscache.
+ *
+ * If given, @term_func will be called upon completion and supplied with
+ * @term_func_priv. Note that the PG_fscache flags will have been cleared by
+ * this point, so the netfs must retain its own pin on the mapping.
+ */
+static inline void fscache_write_to_cache(struct fscache_cookie *cookie,
+ struct address_space *mapping,
+ loff_t start, size_t len, loff_t i_size,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ if (fscache_cookie_valid(cookie)) {
+ __fscache_write_to_cache(cookie, mapping, start, len, i_size,
+ term_func, term_func_priv);
+ } else {
+ fscache_clear_page_bits(cookie, mapping, start, len);
+ if (term_func)
+ term_func(term_func_priv, -ENOBUFS, false);
+ }
+
+}
#endif /* FSCACHE_USE_NEW_IO_API */
#endif /* _LINUX_FSCACHE_H */
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 4ccaf4490b1b..63820b807494 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -78,6 +78,7 @@ enum fscache_access_trace {
fscache_access_io_not_live,
fscache_access_io_read,
fscache_access_io_wait,
+ fscache_access_io_write,
fscache_access_lookup_cookie,
fscache_access_lookup_cookie_end,
fscache_access_relinquish_volume,
@@ -146,6 +147,7 @@ enum fscache_access_trace {
EM(fscache_access_io_not_live, "END io_notl") \
EM(fscache_access_io_read, "BEGIN io_read") \
EM(fscache_access_io_wait, "WAIT io ") \
+ EM(fscache_access_io_write, "BEGIN io_writ") \
EM(fscache_access_lookup_cookie, "BEGIN lookup ") \
EM(fscache_access_lookup_cookie_end, "END lookup ") \
EM(fscache_access_relinquish_volume, "BEGIN rlq_vol") \
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 25/53] fscache: Provide fallback I/O functions
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (23 preceding siblings ...)
2021-10-22 19:04 ` [PATCH v2 24/53] fscache: Implement I/O interface David Howells
@ 2021-10-22 19:04 ` David Howells
2021-10-22 19:05 ` [PATCH v2 26/53] vfs, fscache: Implement pinning of cache usage for writeback David Howells
` (29 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:04 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide functions to perform fallback I/O:
int fscache_fallback_read_page(struct fscache_cookie *cookie,
struct page *page);
int fscache_fallback_write_page(struct fscache_cookie *cookie,
struct page *page);
These read and write a page to the cache described by the cookie. The page
index and size indicate the size and location of the operation. They operate
synchronously.
[!] NOTE: These should be considered dangerous and may malfunction if the
cache is backed by an extent-based filesystem such as ext4, xfs or btrfs due
to the disk filesystem inserting or removing bridging blocks of zeros to
optimise the extent layout. This can cause data corruption.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/io.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/fscache.h | 48 ++++++++++++++++++++++++++++++++++
2 files changed, 114 insertions(+)
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
index 0c74dbb91fea..0c128e61df81 100644
--- a/fs/fscache/io.c
+++ b/fs/fscache/io.c
@@ -151,6 +151,72 @@ int __fscache_begin_read_operation(struct netfs_cache_resources *cres,
}
EXPORT_SYMBOL(__fscache_begin_read_operation);
+/*
+ * Fallback page reading interface.
+ */
+int __fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page)
+{
+ struct netfs_cache_resources cres;
+ struct iov_iter iter;
+ struct bio_vec bvec[1];
+ int ret;
+
+ _enter("%lx", page->index);
+
+ memset(&cres, 0, sizeof(cres));
+ bvec[0].bv_page = page;
+ bvec[0].bv_offset = 0;
+ bvec[0].bv_len = PAGE_SIZE;
+ iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+
+ ret = fscache_begin_operation(&cres, cookie, FSCACHE_WANT_READ,
+ fscache_access_io_write);
+ if (ret < 0)
+ return ret;
+
+ ret = fscache_read(&cres, page_offset(page), &iter, NETFS_READ_HOLE_FAIL,
+ NULL, NULL);
+ fscache_end_operation(&cres);
+ _leave(" = %d", ret);
+ return ret;
+}
+EXPORT_SYMBOL(__fscache_fallback_read_page);
+
+/*
+ * Fallback page writing interface.
+ */
+int __fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page)
+{
+ struct netfs_cache_resources cres;
+ struct iov_iter iter;
+ struct bio_vec bvec[1];
+ int ret;
+
+ _enter("%lx", page->index);
+
+ memset(&cres, 0, sizeof(cres));
+ bvec[0].bv_page = page;
+ bvec[0].bv_offset = 0;
+ bvec[0].bv_len = PAGE_SIZE;
+ iov_iter_bvec(&iter, WRITE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE);
+
+ ret = fscache_begin_operation(&cres, cookie, FSCACHE_WANT_WRITE,
+ fscache_access_io_write);
+ if (ret < 0)
+ return ret;
+
+ ret = cres.ops->prepare_fallback_write(&cres, page_index(page));
+ if (ret < 0)
+ goto out;
+
+ ret = fscache_write(&cres, page_offset(page), &iter, NULL, NULL);
+out:
+ fscache_end_operation(&cres);
+ _leave(" = %d", ret);
+ return ret;
+}
+EXPORT_SYMBOL(__fscache_fallback_write_page);
+
struct fscache_write_request {
struct netfs_cache_resources cache_resources;
struct address_space *mapping;
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index b3b625d0834c..2996b417c5d0 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -171,6 +171,10 @@ extern void __fscache_invalidate(struct fscache_cookie *, const void *, loff_t,
#ifdef FSCACHE_USE_NEW_IO_API
extern int __fscache_begin_read_operation(struct netfs_cache_resources *, struct fscache_cookie *);
#endif
+#ifdef FSCACHE_USE_FALLBACK_IO_API
+extern int __fscache_fallback_read_page(struct fscache_cookie *, struct page *);
+extern int __fscache_fallback_write_page(struct fscache_cookie *, struct page *);
+#endif
extern void __fscache_write_to_cache(struct fscache_cookie *, struct address_space *,
loff_t, size_t, loff_t, netfs_io_terminated_t, void *);
@@ -555,4 +559,48 @@ static inline void fscache_write_to_cache(struct fscache_cookie *cookie,
}
#endif /* FSCACHE_USE_NEW_IO_API */
+#ifdef FSCACHE_USE_FALLBACK_IO_API
+
+/**
+ * fscache_fallback_read_page - Read a page from a cache object (DANGEROUS)
+ * @cookie: The cookie representing the cache object
+ * @page: The page to be read to
+ *
+ * Synchronously read a page from the cache. The page's offset is used to
+ * indicate where to read.
+ *
+ * This is dangerous and should be moved away from as it relies on the
+ * assumption that the backing filesystem will exactly record the blocks we
+ * have stored there.
+ */
+static inline
+int fscache_fallback_read_page(struct fscache_cookie *cookie, struct page *page)
+{
+ if (fscache_cookie_enabled(cookie))
+ return __fscache_fallback_read_page(cookie, page);
+ return -ENOBUFS;
+}
+
+/**
+ * fscache_fallback_write_page - Write a page to a cache object (DANGEROUS)
+ * @cookie: The cookie representing the cache object
+ * @page: The page to be written from
+ *
+ * Synchronously write a page to the cache. The page's offset is used to
+ * indicate where to write.
+ *
+ * This is dangerous and should be moved away from as it relies on the
+ * assumption that the backing filesystem will exactly record the blocks we
+ * have stored there.
+ */
+static inline
+int fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *page)
+{
+ if (fscache_cookie_enabled(cookie))
+ return __fscache_fallback_write_page(cookie, page);
+ return -ENOBUFS;
+}
+
+#endif /* FSCACHE_USE_FALLBACK_IO_API */
+
#endif /* _LINUX_FSCACHE_H */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 26/53] vfs, fscache: Implement pinning of cache usage for writeback
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (24 preceding siblings ...)
2021-10-22 19:04 ` [PATCH v2 25/53] fscache: Provide fallback I/O functions David Howells
@ 2021-10-22 19:05 ` David Howells
2021-10-22 19:05 ` [PATCH v2 27/53] fscache: Provide a function to note the release of a page David Howells
` (28 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:05 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Cachefiles has a problem in that it needs to keep the backing file for a
cookie open whilst there are local modifications pending that need to be
written to it. However, we don't want to keep the file open indefinitely,
as that causes EMFILE/ENFILE/ENOMEM problems.
Reopening the cache file, however, is a problem if this is being done due
to writeback triggered by exit(). Some filesystems will oops if we try to
open a file in that context because they want to access current->fs or
other resources that have already been dismantled.
To get around this, I added the following:
(1) An inode flag, I_PINNING_FSCACHE_WB, to be set on a network filesystem
inode to indicate that we have a usage count on the cookie caching
that inode.
(2) A flag in struct writeback_control, unpinned_fscache_wb, that is set
when __writeback_single_inode() clears the last dirty page from
i_pages - at which point it clears I_PINNING_FSCACHE_WB and sets this
flag.
This has to be done here so that clearing I_PINNING_FSCACHE_WB can be
done atomically with the check of PAGECACHE_TAG_DIRTY that clears
I_DIRTY_PAGES.
(3) A function, fscache_set_page_dirty(), which if it is not set, sets
I_PINNING_FSCACHE_WB and calls fscache_use_cookie() to pin the cache
resources.
(4) A function, fscache_unpin_writeback(), to be called by ->write_inode()
to unuse the cookie.
(5) A function, fscache_clear_inode_writeback(), to be called when the
inode is evicted, before clear_inode() is called. This cleans up any
lingering I_PINNING_FSCACHE_WB.
The network filesystem can then use these tools to make sure that
fscache_write_to_cache() can write locally modified data to the cache as
well as to the server.
For the future, I'm working on write helpers for netfs lib that should
allow this facility to be removed by keeping track of the dirty regions
separately - but that's incomplete at the moment and is also going to be
affected by folios, one way or another, since it deals with pages
Signed-off-by: David Howells <dhowells@redhat.com>cc: linux-cachefs@redhat.com
---
fs/fs-writeback.c | 8 ++++++++
fs/fscache/io.c | 38 ++++++++++++++++++++++++++++++++++++++
include/linux/fs.h | 3 +++
include/linux/fscache.h | 40 ++++++++++++++++++++++++++++++++++++++++
include/linux/fscache_old.h | 1 +
include/linux/writeback.h | 1 +
6 files changed, 91 insertions(+)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 81ec192ce067..f3122831c4fe 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1666,6 +1666,13 @@ __writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
inode->i_state |= I_DIRTY_PAGES;
+ else if (unlikely(inode->i_state & I_PINNING_FSCACHE_WB)) {
+ if (!(inode->i_state & I_DIRTY_PAGES)) {
+ inode->i_state &= ~I_PINNING_FSCACHE_WB;
+ wbc->unpinned_fscache_wb = true;
+ dirty |= I_PINNING_FSCACHE_WB; /* Cause write_inode */
+ }
+ }
spin_unlock(&inode->i_lock);
@@ -1675,6 +1682,7 @@ __writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
if (ret == 0)
ret = err;
}
+ wbc->unpinned_fscache_wb = false;
trace_writeback_single_inode(inode, wbc, nr_to_write);
return ret;
}
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
index 0c128e61df81..5b7ecb8a205b 100644
--- a/fs/fscache/io.c
+++ b/fs/fscache/io.c
@@ -217,6 +217,44 @@ int __fscache_fallback_write_page(struct fscache_cookie *cookie, struct page *pa
}
EXPORT_SYMBOL(__fscache_fallback_write_page);
+/**
+ * fscache_set_page_dirty - Mark page dirty and pin a cache object for writeback
+ * @page: The page being dirtied
+ * @cookie: The cookie referring to the cache object
+ *
+ * Set the dirty flag on a page and pin an in-use cache object in memory when
+ * dirtying a page so that writeback can later write to it. This is intended
+ * to be called from the filesystem's ->set_page_dirty() method.
+ *
+ * Returns 1 if PG_dirty was set on the page, 0 otherwise.
+ */
+int fscache_set_page_dirty(struct page *page, struct fscache_cookie *cookie)
+{
+ struct inode *inode = page->mapping->host;
+ bool need_use = false;
+
+ _enter("");
+
+ if (!__set_page_dirty_nobuffers(page))
+ return 0;
+ if (!fscache_cookie_valid(cookie))
+ return 1;
+
+ if (!(inode->i_state & I_PINNING_FSCACHE_WB)) {
+ spin_lock(&inode->i_lock);
+ if (!(inode->i_state & I_PINNING_FSCACHE_WB)) {
+ inode->i_state |= I_PINNING_FSCACHE_WB;
+ need_use = true;
+ }
+ spin_unlock(&inode->i_lock);
+
+ if (need_use)
+ fscache_use_cookie(cookie, true);
+ }
+ return 1;
+}
+EXPORT_SYMBOL(fscache_set_page_dirty);
+
struct fscache_write_request {
struct netfs_cache_resources cache_resources;
struct address_space *mapping;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e7a633353fd2..908ea452a2cf 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2419,6 +2419,8 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
* Used to detect that mark_inode_dirty() should not move
* inode between dirty lists.
*
+ * I_PINNING_FSCACHE_WB Inode is pinning an fscache object for writeback.
+ *
* Q: What is the difference between I_WILL_FREE and I_FREEING?
*/
#define I_DIRTY_SYNC (1 << 0)
@@ -2441,6 +2443,7 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
#define I_CREATING (1 << 15)
#define I_DONTCACHE (1 << 16)
#define I_SYNC_QUEUED (1 << 17)
+#define I_PINNING_FSCACHE_WB (1 << 18)
#define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
#define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 2996b417c5d0..46a89b5d7cfb 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -559,6 +559,46 @@ static inline void fscache_write_to_cache(struct fscache_cookie *cookie,
}
#endif /* FSCACHE_USE_NEW_IO_API */
+#if __fscache_available
+extern int fscache_set_page_dirty(struct page *page, struct fscache_cookie *cookie);
+#else
+#define fscache_set_page_dirty(PAGE, COOKIE) (__set_page_dirty_nobuffers((PAGE)))
+#endif
+
+/**
+ * fscache_unpin_writeback - Unpin writeback resources
+ * @wbc: The writeback control
+ * @cookie: The cookie referring to the cache object
+ *
+ * Unpin the writeback resources pinned by fscache_set_page_dirty(). This is
+ * intended to be called by the netfs's ->write_inode() method.
+ */
+static inline void fscache_unpin_writeback(struct writeback_control *wbc,
+ struct fscache_cookie *cookie)
+{
+ if (wbc->unpinned_fscache_wb)
+ fscache_unuse_cookie(cookie, NULL, NULL);
+}
+
+/**
+ * fscache_clear_inode_writeback - Clear writeback resources pinned by an inode
+ * @cookie: The cookie referring to the cache object
+ * @inode: The inode to clean up
+ * @aux: Auxiliary data to apply to the inode
+ *
+ * Clear any writeback resources held by an inode when the inode is evicted.
+ * This must be called before clear_inode() is called.
+ */
+static inline void fscache_clear_inode_writeback(struct fscache_cookie *cookie,
+ struct inode *inode,
+ const void *aux)
+{
+ if (inode->i_state & I_PINNING_FSCACHE_WB) {
+ loff_t i_size = i_size_read(inode);
+ fscache_unuse_cookie(cookie, aux, &i_size);
+ }
+}
+
#ifdef FSCACHE_USE_FALLBACK_IO_API
/**
diff --git a/include/linux/fscache_old.h b/include/linux/fscache_old.h
index 01558d155799..ba4878b56717 100644
--- a/include/linux/fscache_old.h
+++ b/include/linux/fscache_old.h
@@ -19,6 +19,7 @@
#include <linux/pagemap.h>
#include <linux/pagevec.h>
#include <linux/list_bl.h>
+#include <linux/writeback.h>
#include <linux/netfs.h>
#if defined(CONFIG_FSCACHE) || defined(CONFIG_FSCACHE_MODULE)
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index d1f65adf6a26..2fda288600d3 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -69,6 +69,7 @@ struct writeback_control {
unsigned for_reclaim:1; /* Invoked from the page allocator */
unsigned range_cyclic:1; /* range_start is cyclic */
unsigned for_sync:1; /* sync(2) WB_SYNC_ALL writeback */
+ unsigned unpinned_fscache_wb:1; /* Cleared I_PINNING_FSCACHE_WB */
/*
* When writeback IOs are bounced through async layers, only the
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 27/53] fscache: Provide a function to note the release of a page
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (25 preceding siblings ...)
2021-10-22 19:05 ` [PATCH v2 26/53] vfs, fscache: Implement pinning of cache usage for writeback David Howells
@ 2021-10-22 19:05 ` David Howells
2021-10-22 19:05 ` [PATCH v2 28/53] fscache: Provide a function to resize a cookie David Howells
` (27 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:05 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide a function to be called from a network filesystem's releasepage
method to indicate that a page has been released that might have been a
reflection of data upon the server - and now that data must be reloaded
from the server or the cache.
This is used to end an optimisation for empty files, in particular files
that have just been created locally, whereby we know there cannot yet be
any data that we would need to read from the server or the cache.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
include/linux/fscache.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 46a89b5d7cfb..2b118e517c1d 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -599,6 +599,22 @@ static inline void fscache_clear_inode_writeback(struct fscache_cookie *cookie,
}
}
+/**
+ * fscache_note_page_release - Note that a netfs page got released
+ * @cookie: The cookie corresponding to the file
+ *
+ * Note that a page that has been copied to the cache has been released. This
+ * means that future reads will need to look in the cache to see if it's there.
+ */
+static inline
+void fscache_note_page_release(struct fscache_cookie *cookie)
+{
+ if (cookie &&
+ test_bit(FSCACHE_COOKIE_HAVE_DATA, &cookie->flags) &&
+ test_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags))
+ clear_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags);
+}
+
#ifdef FSCACHE_USE_FALLBACK_IO_API
/**
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 28/53] fscache: Provide a function to resize a cookie
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (26 preceding siblings ...)
2021-10-22 19:05 ` [PATCH v2 27/53] fscache: Provide a function to note the release of a page David Howells
@ 2021-10-22 19:05 ` David Howells
2021-10-22 19:05 ` [PATCH v2 29/53] cachefiles: Introduce new driver David Howells
` (26 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:05 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide a function to change the size of the storage attached to a cookie,
to match the size of the file being cached when it's changed by truncate or
fallocate:
void fscache_resize_cookie(struct fscache_cookie *cookie,
loff_t new_size);
This acts synchronously and is expected to run under the inode lock of the
caller.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/fscache/internal.h | 3 +++
fs/fscache/io.c | 25 +++++++++++++++++++++++++
fs/fscache/stats.c | 9 +++++++--
include/linux/fscache-cache.h | 4 ++++
include/linux/fscache.h | 18 ++++++++++++++++++
include/trace/events/fscache.h | 25 +++++++++++++++++++++++++
6 files changed, 82 insertions(+), 2 deletions(-)
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 4c45d2af7160..9ccbbd793ea3 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -88,6 +88,9 @@ extern atomic_t fscache_n_relinquishes;
extern atomic_t fscache_n_relinquishes_retire;
extern atomic_t fscache_n_relinquishes_dropped;
+extern atomic_t fscache_n_resizes;
+extern atomic_t fscache_n_resizes_null;
+
static inline void fscache_stat(atomic_t *stat)
{
atomic_inc(stat);
diff --git a/fs/fscache/io.c b/fs/fscache/io.c
index 5b7ecb8a205b..bc8d1ac0e85c 100644
--- a/fs/fscache/io.c
+++ b/fs/fscache/io.c
@@ -255,6 +255,31 @@ int fscache_set_page_dirty(struct page *page, struct fscache_cookie *cookie)
}
EXPORT_SYMBOL(fscache_set_page_dirty);
+/*
+ * Change the size of a backing object.
+ */
+void __fscache_resize_cookie(struct fscache_cookie *cookie, loff_t new_size)
+{
+ struct netfs_cache_resources cres;
+
+ trace_fscache_resize(cookie, new_size);
+ if (fscache_begin_operation(&cres, cookie, FSCACHE_WANT_WRITE,
+ fscache_access_io_resize) == 0) {
+ fscache_stat(&fscache_n_resizes);
+ set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
+
+ /* We cannot defer a resize as we need to do it inside the
+ * netfs's inode lock so that we're serialised with respect to
+ * writes.
+ */
+ cookie->volume->cache->ops->resize_cookie(&cres, new_size);
+ fscache_end_operation(&cres);
+ } else {
+ fscache_stat(&fscache_n_resizes_null);
+ }
+}
+EXPORT_SYMBOL(__fscache_resize_cookie);
+
struct fscache_write_request {
struct netfs_cache_resources cache_resources;
struct address_space *mapping;
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 8d5ad6771498..225bba60b617 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -37,6 +37,9 @@ atomic_t fscache_n_relinquishes;
atomic_t fscache_n_relinquishes_retire;
atomic_t fscache_n_relinquishes_dropped;
+atomic_t fscache_n_resizes;
+atomic_t fscache_n_resizes_null;
+
atomic_t fscache_n_read;
EXPORT_SYMBOL(fscache_n_read);
atomic_t fscache_n_write;
@@ -73,8 +76,10 @@ int fscache_stats_show(struct seq_file *m, void *v)
seq_printf(m, "Invals : n=%u\n",
atomic_read(&fscache_n_invalidates));
- seq_printf(m, "Updates: n=%u\n",
- atomic_read(&fscache_n_updates));
+ seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
+ atomic_read(&fscache_n_updates),
+ atomic_read(&fscache_n_resizes),
+ atomic_read(&fscache_n_resizes_null));
seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
atomic_read(&fscache_n_relinquishes),
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 6830f91ebaf4..d5f6b636175e 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -66,6 +66,10 @@ struct fscache_cache_ops {
/* Withdraw an object without any cookie access counts held */
void (*withdraw_cookie)(struct fscache_cookie *cookie);
+ /* Change the size of a data object */
+ void (*resize_cookie)(struct netfs_cache_resources *cres,
+ loff_t new_size);
+
/* Invalidate an object */
bool (*invalidate_cookie)(struct fscache_cookie *cookie);
diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 2b118e517c1d..877594fc057b 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -167,6 +167,7 @@ extern struct fscache_cookie *__fscache_acquire_cookie(
extern void __fscache_use_cookie(struct fscache_cookie *, bool);
extern void __fscache_unuse_cookie(struct fscache_cookie *, const void *, const loff_t *);
extern void __fscache_relinquish_cookie(struct fscache_cookie *, bool);
+extern void __fscache_resize_cookie(struct fscache_cookie *, loff_t);
extern void __fscache_invalidate(struct fscache_cookie *, const void *, loff_t, unsigned int);
#ifdef FSCACHE_USE_NEW_IO_API
extern int __fscache_begin_read_operation(struct netfs_cache_resources *, struct fscache_cookie *);
@@ -368,6 +369,23 @@ void fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data,
__fscache_update_cookie(cookie, aux_data, object_size);
}
+/**
+ * fscache_resize_cookie - Request that a cache object be resized
+ * @cookie: The cookie representing the cache object
+ * @new_size: The new size of the object (may be NULL)
+ *
+ * Request that the size of an object be changed.
+ *
+ * See Documentation/filesystems/caching/netfs-api.txt for a complete
+ * description.
+ */
+static inline
+void fscache_resize_cookie(struct fscache_cookie *cookie, loff_t new_size)
+{
+ if (fscache_cookie_enabled(cookie))
+ __fscache_resize_cookie(cookie, new_size);
+}
+
/**
* fscache_invalidate - Notify cache that an object needs invalidation
* @cookie: The cookie representing the cache object
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 63820b807494..b01784370963 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -77,6 +77,7 @@ enum fscache_access_trace {
fscache_access_invalidate_cookie_end,
fscache_access_io_not_live,
fscache_access_io_read,
+ fscache_access_io_resize,
fscache_access_io_wait,
fscache_access_io_write,
fscache_access_lookup_cookie,
@@ -146,6 +147,7 @@ enum fscache_access_trace {
EM(fscache_access_invalidate_cookie_end,"END inval ") \
EM(fscache_access_io_not_live, "END io_notl") \
EM(fscache_access_io_read, "BEGIN io_read") \
+ EM(fscache_access_io_resize, "BEGIN io_resz") \
EM(fscache_access_io_wait, "WAIT io ") \
EM(fscache_access_io_write, "BEGIN io_writ") \
EM(fscache_access_lookup_cookie, "BEGIN lookup ") \
@@ -411,6 +413,29 @@ TRACE_EVENT(fscache_invalidate,
__entry->cookie, __entry->new_size)
);
+TRACE_EVENT(fscache_resize,
+ TP_PROTO(struct fscache_cookie *cookie, loff_t new_size),
+
+ TP_ARGS(cookie, new_size),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, cookie )
+ __field(loff_t, old_size )
+ __field(loff_t, new_size )
+ ),
+
+ TP_fast_assign(
+ __entry->cookie = cookie->debug_id;
+ __entry->old_size = cookie->object_size;
+ __entry->new_size = new_size;
+ ),
+
+ TP_printk("c=%08x os=%08llx sz=%08llx",
+ __entry->cookie,
+ __entry->old_size,
+ __entry->new_size)
+ );
+
#endif /* _TRACE_FSCACHE_H */
/* This part must be outside protection */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 29/53] cachefiles: Introduce new driver
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (27 preceding siblings ...)
2021-10-22 19:05 ` [PATCH v2 28/53] fscache: Provide a function to resize a cookie David Howells
@ 2021-10-22 19:05 ` David Howells
2021-10-22 19:06 ` [PATCH v2 30/53] cachefiles: Add some error injection support David Howells
` (25 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:05 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Introduce basic skeleton of the new, rewritten cachefiles driver.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/Kconfig | 1
fs/Makefile | 1
fs/cachefiles/Kconfig | 21 +++++++
fs/cachefiles/Makefile | 9 +++
fs/cachefiles/internal.h | 118 +++++++++++++++++++++++++++++++++++++
fs/cachefiles/main.c | 53 +++++++++++++++++
include/trace/events/cachefiles.h | 49 +++++++++++++++
7 files changed, 252 insertions(+)
create mode 100644 fs/cachefiles/Kconfig
create mode 100644 fs/cachefiles/Makefile
create mode 100644 fs/cachefiles/internal.h
create mode 100644 fs/cachefiles/main.c
create mode 100644 include/trace/events/cachefiles.h
diff --git a/fs/Kconfig b/fs/Kconfig
index 68f662c09a8d..001fd1a9115c 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -132,6 +132,7 @@ menu "Caches"
source "fs/netfs/Kconfig"
source "fs/fscache/Kconfig"
+source "fs/cachefiles/Kconfig"
source "fs/fscache_old/Kconfig"
source "fs/cachefiles_old/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index 0dd8a4d526ad..09703d49ac90 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -126,6 +126,7 @@ obj-$(CONFIG_AFS_FS) += afs/
obj-$(CONFIG_NILFS2_FS) += nilfs2/
obj-$(CONFIG_BEFS_FS) += befs/
obj-$(CONFIG_HOSTFS) += hostfs/
+obj-$(CONFIG_CACHEFILES) += cachefiles/
obj-$(CONFIG_CACHEFILES_OLD) += cachefiles_old/
obj-$(CONFIG_DEBUG_FS) += debugfs/
obj-$(CONFIG_TRACING) += tracefs/
diff --git a/fs/cachefiles/Kconfig b/fs/cachefiles/Kconfig
new file mode 100644
index 000000000000..6827b40f7ddc
--- /dev/null
+++ b/fs/cachefiles/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config CACHEFILES
+ tristate "Filesystem caching on files"
+ depends on FSCACHE && BLOCK
+ help
+ This permits use of a mounted filesystem as a cache for other
+ filesystems - primarily networking filesystems - thus allowing fast
+ local disk to enhance the speed of slower devices.
+
+ See Documentation/filesystems/caching/cachefiles.rst for more
+ information.
+
+config CACHEFILES_DEBUG
+ bool "Debug CacheFiles"
+ depends on CACHEFILES
+ help
+ This permits debugging to be dynamically enabled in the filesystem
+ caching on files module. If this is set, the debugging output may be
+ enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
+ by including a debugging specifier in /etc/cachefilesd.conf.
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
new file mode 100644
index 000000000000..a7f3e982e249
--- /dev/null
+++ b/fs/cachefiles/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for caching in a mounted filesystem
+#
+
+cachefiles-y := \
+ main.o
+
+obj-$(CONFIG_CACHEFILES) := cachefiles.o
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
new file mode 100644
index 000000000000..55da223e49a9
--- /dev/null
+++ b/fs/cachefiles/internal.h
@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* General netfs cache on cache files internal defs
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+
+#define pr_fmt(fmt) "CacheFiles: " fmt
+
+
+#include <linux/fscache-cache.h>
+#include <linux/timer.h>
+#include <linux/wait_bit.h>
+#include <linux/cred.h>
+#include <linux/workqueue.h>
+#include <linux/security.h>
+
+extern unsigned cachefiles_debug;
+#define CACHEFILES_DEBUG_KENTER 1
+#define CACHEFILES_DEBUG_KLEAVE 2
+#define CACHEFILES_DEBUG_KDEBUG 4
+
+
+/*
+ * debug tracing
+ */
+#define dbgprintk(FMT, ...) \
+ printk("[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
+
+#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
+
+
+#if defined(__KDEBUG)
+#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
+#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
+#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
+
+#elif defined(CONFIG_CACHEFILES_DEBUG)
+#define _enter(FMT, ...) \
+do { \
+ if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
+ kenter(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _leave(FMT, ...) \
+do { \
+ if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
+ kleave(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#define _debug(FMT, ...) \
+do { \
+ if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
+ kdebug(FMT, ##__VA_ARGS__); \
+} while (0)
+
+#else
+#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
+#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
+#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
+#endif
+
+#if 1 /* defined(__KDEBUGALL) */
+
+#define ASSERT(X) \
+do { \
+ if (unlikely(!(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+ if (unlikely(!((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIF(C, X) \
+do { \
+ if (unlikely((C) && !(X))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ BUG(); \
+ } \
+} while (0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+ if (unlikely((C) && !((X) OP (Y)))) { \
+ pr_err("\n"); \
+ pr_err("Assertion failed\n"); \
+ pr_err("%lx " #OP " %lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while (0)
+
+#else
+
+#define ASSERT(X) do {} while (0)
+#define ASSERTCMP(X, OP, Y) do {} while (0)
+#define ASSERTIF(C, X) do {} while (0)
+#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
+
+#endif
diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c
new file mode 100644
index 000000000000..47bc1cc078de
--- /dev/null
+++ b/fs/cachefiles/main.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Network filesystem caching backend to use cache files on a premounted
+ * filesystem
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/sysctl.h>
+#include <linux/miscdevice.h>
+#include <linux/netfs.h>
+#include <trace/events/netfs.h>
+#define CREATE_TRACE_POINTS
+#include "internal.h"
+
+unsigned cachefiles_debug;
+module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
+
+MODULE_DESCRIPTION("Mounted-filesystem based cache");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+/*
+ * initialise the fs caching module
+ */
+static int __init cachefiles_init(void)
+{
+ pr_info("Loaded\n");
+ return 0;
+}
+
+fs_initcall(cachefiles_init);
+
+/*
+ * clean up on module removal
+ */
+static void __exit cachefiles_exit(void)
+{
+ pr_info("Unloading\n");
+}
+
+module_exit(cachefiles_exit);
diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h
new file mode 100644
index 000000000000..5ee0aabb20be
--- /dev/null
+++ b/include/trace/events/cachefiles.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* CacheFiles tracepoints
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cachefiles
+
+#if !defined(_TRACE_CACHEFILES_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CACHEFILES_H
+
+#include <linux/tracepoint.h>
+
+/*
+ * Define enums for tracing information.
+ */
+#ifndef __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
+#define __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
+
+#endif
+
+/*
+ * Define enum -> string mappings for display.
+ */
+
+
+/*
+ * Export enum symbols via userspace.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) TRACE_DEFINE_ENUM(a);
+#define E_(a, b) TRACE_DEFINE_ENUM(a);
+
+/*
+ * Now redefine the EM() and E_() macros to map the enums to the strings that
+ * will be printed in the output.
+ */
+#undef EM
+#undef E_
+#define EM(a, b) { a, b },
+#define E_(a, b) { a, b }
+
+
+#endif /* _TRACE_CACHEFILES_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 30/53] cachefiles: Add some error injection support
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (28 preceding siblings ...)
2021-10-22 19:05 ` [PATCH v2 29/53] cachefiles: Introduce new driver David Howells
@ 2021-10-22 19:06 ` David Howells
2021-10-22 19:06 ` [PATCH v2 31/53] cachefiles: Define structs David Howells
` (24 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:06 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add support for injecting ENOSPC or EIO errors. This needs to be enabled
by CONFIG_CACHEFILES_ERROR_INJECTION=y. Once enabled, ENOSPC on things
like write and mkdir can be triggered by:
echo 1 >/proc/sys/cachefiles/error_injection
and EIO can be triggered on most operations by:
echo 2 >/proc/sys/cachefiles/error_injection
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/Kconfig | 7 ++++++
fs/cachefiles/Makefile | 2 ++
fs/cachefiles/error_inject.c | 46 ++++++++++++++++++++++++++++++++++++++++++
fs/cachefiles/internal.h | 39 ++++++++++++++++++++++++++++++++++++
fs/cachefiles/main.c | 12 +++++++++++
5 files changed, 106 insertions(+)
create mode 100644 fs/cachefiles/error_inject.c
diff --git a/fs/cachefiles/Kconfig b/fs/cachefiles/Kconfig
index 6827b40f7ddc..719faeeda168 100644
--- a/fs/cachefiles/Kconfig
+++ b/fs/cachefiles/Kconfig
@@ -19,3 +19,10 @@ config CACHEFILES_DEBUG
caching on files module. If this is set, the debugging output may be
enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
by including a debugging specifier in /etc/cachefilesd.conf.
+
+config CACHEFILES_ERROR_INJECTION
+ bool "Provide error injection for cachefiles"
+ depends on CACHEFILES && SYSCTL
+ help
+ This permits error injection to be enabled in cachefiles whilst a
+ cache is in service.
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index a7f3e982e249..183fb5f3b8b1 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -6,4 +6,6 @@
cachefiles-y := \
main.o
+cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o
+
obj-$(CONFIG_CACHEFILES) := cachefiles.o
diff --git a/fs/cachefiles/error_inject.c b/fs/cachefiles/error_inject.c
new file mode 100644
index 000000000000..58f8aec964e4
--- /dev/null
+++ b/fs/cachefiles/error_inject.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Error injection handling.
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/sysctl.h>
+#include "internal.h"
+
+unsigned int cachefiles_error_injection_state;
+
+static struct ctl_table_header *cachefiles_sysctl;
+static struct ctl_table cachefiles_sysctls[] = {
+ {
+ .procname = "error_injection",
+ .data = &cachefiles_error_injection_state,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_douintvec,
+ },
+ {}
+};
+
+static struct ctl_table cachefiles_sysctls_root[] = {
+ {
+ .procname = "cachefiles",
+ .mode = 0555,
+ .child = cachefiles_sysctls,
+ },
+ {}
+};
+
+int __init cachefiles_register_error_injection(void)
+{
+ cachefiles_sysctl = register_sysctl_table(cachefiles_sysctls_root);
+ if (!cachefiles_sysctl)
+ return -ENOMEM;
+ return 0;
+
+}
+
+void cachefiles_unregister_error_injection(void)
+{
+ unregister_sysctl_table(cachefiles_sysctl);
+}
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 55da223e49a9..2f8e2835a785 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -24,6 +24,45 @@ extern unsigned cachefiles_debug;
#define CACHEFILES_DEBUG_KLEAVE 2
#define CACHEFILES_DEBUG_KDEBUG 4
+/*
+ * error_inject.c
+ */
+#ifdef CONFIG_CACHEFILES_ERROR_INJECTION
+extern unsigned int cachefiles_error_injection_state;
+extern int cachefiles_register_error_injection(void);
+extern void cachefiles_unregister_error_injection(void);
+
+#else
+#define cachefiles_error_injection_state 0
+
+static inline int cachefiles_register_error_injection(void)
+{
+ return 0;
+}
+
+static inline void cachefiles_unregister_error_injection(void)
+{
+}
+#endif
+
+
+static inline int cachefiles_inject_read_error(void)
+{
+ return cachefiles_error_injection_state & 2 ? -EIO : 0;
+}
+
+static inline int cachefiles_inject_write_error(void)
+{
+ return cachefiles_error_injection_state & 2 ? -EIO :
+ cachefiles_error_injection_state & 1 ? -ENOSPC :
+ 0;
+}
+
+static inline int cachefiles_inject_remove_error(void)
+{
+ return cachefiles_error_injection_state & 2 ? -EIO : 0;
+}
+
/*
* debug tracing
diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c
index 47bc1cc078de..387d42c7185f 100644
--- a/fs/cachefiles/main.c
+++ b/fs/cachefiles/main.c
@@ -36,8 +36,18 @@ MODULE_LICENSE("GPL");
*/
static int __init cachefiles_init(void)
{
+ int ret;
+
+ ret = cachefiles_register_error_injection();
+ if (ret < 0)
+ goto error_einj;
+
pr_info("Loaded\n");
return 0;
+
+error_einj:
+ pr_err("failed to register: %d\n", ret);
+ return ret;
}
fs_initcall(cachefiles_init);
@@ -48,6 +58,8 @@ fs_initcall(cachefiles_init);
static void __exit cachefiles_exit(void)
{
pr_info("Unloading\n");
+
+ cachefiles_unregister_error_injection();
}
module_exit(cachefiles_exit);
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 31/53] cachefiles: Define structs
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (29 preceding siblings ...)
2021-10-22 19:06 ` [PATCH v2 30/53] cachefiles: Add some error injection support David Howells
@ 2021-10-22 19:06 ` David Howells
2021-10-22 19:06 ` [PATCH v2 32/53] cachefiles: Add a couple of tracepoints for logging errors David Howells
` (23 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:06 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Define structures to represent the state inside cachefiles. There are
three structures:
(1) struct cachefiles_cache.
This represents the cache as a whole and is used to keep track of the
cache parameters and security, the communication channel to the
controlling daemon and various directories in the cache filesystem.
(2) struct cachefiles_volume.
This represents a volume in the cache. It keeps track of the
directory for the volume and the fanout subdirs that form a hash
table.
(3) struct cachefiles_object.
This represents a data file in the cache. It keeps track of the
filename and the open file handle for the relevant file.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/internal.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 2f8e2835a785..11dcf9dbcf05 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -19,11 +19,97 @@
#include <linux/workqueue.h>
#include <linux/security.h>
+struct cachefiles_cache;
+struct cachefiles_object;
+
extern unsigned cachefiles_debug;
#define CACHEFILES_DEBUG_KENTER 1
#define CACHEFILES_DEBUG_KLEAVE 2
#define CACHEFILES_DEBUG_KDEBUG 4
+enum cachefiles_content {
+ /* These values are saved on disk */
+ CACHEFILES_CONTENT_NO_DATA = 0, /* No content stored */
+ CACHEFILES_CONTENT_SINGLE = 1, /* Content is monolithic, all is present */
+ CACHEFILES_CONTENT_ALL = 2, /* Content is all present, no map */
+ CACHEFILES_CONTENT_BACKFS_MAP = 3, /* Content is piecemeal, mapped through backing fs */
+ CACHEFILES_CONTENT_DIRTY = 4, /* Content is dirty (only seen on disk) */
+ nr__cachefiles_content
+};
+
+/*
+ * Cached volume representation.
+ */
+struct cachefiles_volume {
+ struct cachefiles_cache *cache;
+ struct list_head cache_link; /* Link in cache->volumes */
+ struct fscache_volume *vcookie; /* The netfs's representation */
+ struct dentry *dentry; /* The volume dentry */
+ struct dentry *fanout[256]; /* Fanout subdirs */
+};
+
+/*
+ * node records
+ */
+struct cachefiles_object {
+ int debug_id; /* debugging ID */
+ spinlock_t lock; /* state and operations lock */
+
+ struct list_head cache_link; /* Link in cache->*_list */
+ struct cachefiles_volume *volume; /* Cache volume that holds this object */
+ struct fscache_cookie *cookie; /* netfs's file/index object */
+ struct file *file; /* The file representing this object */
+ char *d_name; /* Filename */
+ atomic_t usage; /* object usage count */
+ u8 d_name_len; /* Length of filename */
+ u8 key_hash; /* Hash of object key */
+ unsigned long flags;
+#define CACHEFILES_OBJECT_USING_TMPFILE 0 /* Have an unlinked tmpfile */
+ enum cachefiles_content content_info:8; /* Info about content presence */
+};
+
+/*
+ * Cache files cache definition
+ */
+struct cachefiles_cache {
+ struct fscache_cache *cache; /* Cache cookie */
+ struct vfsmount *mnt; /* mountpoint holding the cache */
+ struct dentry *store; /* Directory into which live objects go */
+ struct dentry *graveyard; /* directory into which dead objects go */
+ struct file *cachefilesd; /* manager daemon handle */
+ struct list_head volumes; /* List of volume objects */
+ struct list_head object_list; /* List of active objects */
+ spinlock_t object_list_lock;
+ const struct cred *cache_cred; /* security override for accessing cache */
+ struct mutex daemon_mutex; /* command serialisation mutex */
+ wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
+ atomic_t gravecounter; /* graveyard uniquifier */
+ atomic_t f_released; /* number of objects released lately */
+ atomic_long_t b_released; /* number of blocks released lately */
+ unsigned frun_percent; /* when to stop culling (% files) */
+ unsigned fcull_percent; /* when to start culling (% files) */
+ unsigned fstop_percent; /* when to stop allocating (% files) */
+ unsigned brun_percent; /* when to stop culling (% blocks) */
+ unsigned bcull_percent; /* when to start culling (% blocks) */
+ unsigned bstop_percent; /* when to stop allocating (% blocks) */
+ unsigned bsize; /* cache's block size */
+ unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
+ uint64_t frun; /* when to stop culling */
+ uint64_t fcull; /* when to start culling */
+ uint64_t fstop; /* when to stop allocating */
+ sector_t brun; /* when to stop culling */
+ sector_t bcull; /* when to start culling */
+ sector_t bstop; /* when to stop allocating */
+ unsigned long flags;
+#define CACHEFILES_READY 0 /* T if cache prepared */
+#define CACHEFILES_DEAD 1 /* T if cache dead */
+#define CACHEFILES_CULLING 2 /* T if cull engaged */
+#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
+ char *rootdirname; /* name of cache root directory */
+ char *secctx; /* LSM security context */
+ char *tag; /* cache binding tag */
+};
+
/*
* error_inject.c
*/
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 32/53] cachefiles: Add a couple of tracepoints for logging errors
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (30 preceding siblings ...)
2021-10-22 19:06 ` [PATCH v2 31/53] cachefiles: Define structs David Howells
@ 2021-10-22 19:06 ` David Howells
2021-10-22 19:06 ` [PATCH v2 33/53] cachefiles: Add I/O error reporting macros David Howells
` (22 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:06 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add two trace points to log errors, one for vfs operations like mkdir or
create, and one for I/O operations, like read, write or truncate.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/internal.h | 4 ++
include/trace/events/cachefiles.h | 94 +++++++++++++++++++++++++++++++++++++
2 files changed, 98 insertions(+)
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 11dcf9dbcf05..d615213a2fa1 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -68,6 +68,8 @@ struct cachefiles_object {
enum cachefiles_content content_info:8; /* Info about content presence */
};
+extern struct kmem_cache *cachefiles_object_jar;
+
/*
* Cache files cache definition
*/
@@ -110,6 +112,8 @@ struct cachefiles_cache {
char *tag; /* cache binding tag */
};
+#include <trace/events/cachefiles.h>
+
/*
* error_inject.c
*/
diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h
index 5ee0aabb20be..9bd5a8a60801 100644
--- a/include/trace/events/cachefiles.h
+++ b/include/trace/events/cachefiles.h
@@ -18,11 +18,49 @@
#ifndef __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
#define __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
+enum cachefiles_error_trace {
+ cachefiles_trace_fallocate_error,
+ cachefiles_trace_getxattr_error,
+ cachefiles_trace_link_error,
+ cachefiles_trace_lookup_error,
+ cachefiles_trace_mkdir_error,
+ cachefiles_trace_notify_change_error,
+ cachefiles_trace_open_error,
+ cachefiles_trace_read_error,
+ cachefiles_trace_remxattr_error,
+ cachefiles_trace_rename_error,
+ cachefiles_trace_seek_error,
+ cachefiles_trace_setxattr_error,
+ cachefiles_trace_statfs_error,
+ cachefiles_trace_tmpfile_error,
+ cachefiles_trace_trunc_error,
+ cachefiles_trace_unlink_error,
+ cachefiles_trace_write_error,
+};
+
#endif
/*
* Define enum -> string mappings for display.
*/
+#define cachefiles_error_traces \
+ EM(cachefiles_trace_fallocate_error, "fallocate") \
+ EM(cachefiles_trace_getxattr_error, "getxattr") \
+ EM(cachefiles_trace_link_error, "link") \
+ EM(cachefiles_trace_lookup_error, "lookup") \
+ EM(cachefiles_trace_mkdir_error, "mkdir") \
+ EM(cachefiles_trace_notify_change_error, "notify_change") \
+ EM(cachefiles_trace_open_error, "open") \
+ EM(cachefiles_trace_read_error, "read") \
+ EM(cachefiles_trace_remxattr_error, "remxattr") \
+ EM(cachefiles_trace_rename_error, "rename") \
+ EM(cachefiles_trace_seek_error, "seek") \
+ EM(cachefiles_trace_setxattr_error, "setxattr") \
+ EM(cachefiles_trace_statfs_error, "statfs") \
+ EM(cachefiles_trace_tmpfile_error, "tmpfile") \
+ EM(cachefiles_trace_trunc_error, "trunc") \
+ EM(cachefiles_trace_unlink_error, "unlink") \
+ E_(cachefiles_trace_write_error, "write")
/*
@@ -33,6 +71,8 @@
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define E_(a, b) TRACE_DEFINE_ENUM(a);
+cachefiles_error_traces;
+
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
* will be printed in the output.
@@ -43,6 +83,60 @@
#define E_(a, b) { a, b }
+TRACE_EVENT(cachefiles_vfs_error,
+ TP_PROTO(struct cachefiles_object *obj, struct inode *backer,
+ int error, enum cachefiles_error_trace where),
+
+ TP_ARGS(obj, backer, error, where),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, backer )
+ __field(enum cachefiles_error_trace, where )
+ __field(short, error )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj ? obj->debug_id : 0;
+ __entry->backer = backer->i_ino;
+ __entry->error = error;
+ __entry->where = where;
+ ),
+
+ TP_printk("o=%08x b=%08x %s e=%d",
+ __entry->obj,
+ __entry->backer,
+ __print_symbolic(__entry->where, cachefiles_error_traces),
+ __entry->error)
+ );
+
+TRACE_EVENT(cachefiles_io_error,
+ TP_PROTO(struct cachefiles_object *obj, struct inode *backer,
+ int error, enum cachefiles_error_trace where),
+
+ TP_ARGS(obj, backer, error, where),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, backer )
+ __field(enum cachefiles_error_trace, where )
+ __field(short, error )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj ? obj->debug_id : 0;
+ __entry->backer = backer->i_ino;
+ __entry->error = error;
+ __entry->where = where;
+ ),
+
+ TP_printk("o=%08x b=%08x %s e=%d",
+ __entry->obj,
+ __entry->backer,
+ __print_symbolic(__entry->where, cachefiles_error_traces),
+ __entry->error)
+ );
+
#endif /* _TRACE_CACHEFILES_H */
/* This part must be outside protection */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 33/53] cachefiles: Add I/O error reporting macros
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (31 preceding siblings ...)
2021-10-22 19:06 ` [PATCH v2 32/53] cachefiles: Add a couple of tracepoints for logging errors David Howells
@ 2021-10-22 19:06 ` David Howells
2021-10-22 19:06 ` [PATCH v2 34/53] cachefiles: Provide a function to check how much space there is David Howells
` (21 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:06 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add a couple of macros to report I/O errors and to tell fscache that the
cache is in trouble.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/internal.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index d615213a2fa1..230a1a2bf01d 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -153,6 +153,26 @@ static inline int cachefiles_inject_remove_error(void)
return cachefiles_error_injection_state & 2 ? -EIO : 0;
}
+/*
+ * error handling
+ */
+
+#define cachefiles_io_error(___cache, FMT, ...) \
+do { \
+ pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \
+ fscache_io_error((___cache)->cache); \
+ set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
+} while (0)
+
+#define cachefiles_io_error_obj(object, FMT, ...) \
+do { \
+ struct cachefiles_cache *___cache; \
+ \
+ ___cache = (object)->volume->cache; \
+ cachefiles_io_error(___cache, FMT " [o=%08x]", ##__VA_ARGS__, \
+ (object)->debug_id); \
+} while (0)
+
/*
* debug tracing
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 34/53] cachefiles: Provide a function to check how much space there is
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (32 preceding siblings ...)
2021-10-22 19:06 ` [PATCH v2 33/53] cachefiles: Add I/O error reporting macros David Howells
@ 2021-10-22 19:06 ` David Howells
2021-10-22 19:07 ` [PATCH v2 35/53] cachefiles: Implement a function to get/create a directory in the cache David Howells
` (20 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:06 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide a function to check how much space there is. This also flips the
state on the cache and will signal the daemon to inform it of the change
and to ask it to do some culling if necessary.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/Makefile | 1
fs/cachefiles/daemon.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++
fs/cachefiles/internal.h | 15 ++++++
3 files changed, 124 insertions(+)
create mode 100644 fs/cachefiles/daemon.c
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index 183fb5f3b8b1..4c80d9af151f 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -4,6 +4,7 @@
#
cachefiles-y := \
+ daemon.o \
main.o
cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
new file mode 100644
index 000000000000..dca2520a14ee
--- /dev/null
+++ b/fs/cachefiles/daemon.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Daemon interface
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/namei.h>
+#include <linux/poll.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/fs_struct.h>
+#include "internal.h"
+
+/*
+ * see if we have space for a number of pages and/or a number of files in the
+ * cache
+ */
+int cachefiles_has_space(struct cachefiles_cache *cache,
+ unsigned fnr, unsigned bnr)
+{
+ struct kstatfs stats;
+ int ret;
+
+ struct path path = {
+ .mnt = cache->mnt,
+ .dentry = cache->store,
+ };
+
+ //_enter("{%llu,%llu,%llu,%llu,%llu,%llu},%u,%u",
+ // (unsigned long long) cache->frun,
+ // (unsigned long long) cache->fcull,
+ // (unsigned long long) cache->fstop,
+ // (unsigned long long) cache->brun,
+ // (unsigned long long) cache->bcull,
+ // (unsigned long long) cache->bstop,
+ // fnr, bnr);
+
+ /* find out how many pages of blockdev are available */
+ memset(&stats, 0, sizeof(stats));
+
+ ret = vfs_statfs(&path, &stats);
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(NULL, d_inode(cache->store), ret,
+ cachefiles_trace_statfs_error);
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "statfs failed");
+ _leave(" = %d", ret);
+ return ret;
+ }
+
+ stats.f_bavail >>= cache->bshift;
+
+ //_debug("avail %llu,%llu",
+ // (unsigned long long) stats.f_ffree,
+ // (unsigned long long) stats.f_bavail);
+
+ /* see if there is sufficient space */
+ if (stats.f_ffree > fnr)
+ stats.f_ffree -= fnr;
+ else
+ stats.f_ffree = 0;
+
+ if (stats.f_bavail > bnr)
+ stats.f_bavail -= bnr;
+ else
+ stats.f_bavail = 0;
+
+ ret = -ENOBUFS;
+ if (stats.f_ffree < cache->fstop ||
+ stats.f_bavail < cache->bstop)
+ goto begin_cull;
+
+ ret = 0;
+ if (stats.f_ffree < cache->fcull ||
+ stats.f_bavail < cache->bcull)
+ goto begin_cull;
+
+ if (test_bit(CACHEFILES_CULLING, &cache->flags) &&
+ stats.f_ffree >= cache->frun &&
+ stats.f_bavail >= cache->brun &&
+ test_and_clear_bit(CACHEFILES_CULLING, &cache->flags)
+ ) {
+ _debug("cease culling");
+ cachefiles_state_changed(cache);
+ }
+
+ //_leave(" = 0");
+ return 0;
+
+begin_cull:
+ if (!test_and_set_bit(CACHEFILES_CULLING, &cache->flags)) {
+ _debug("### CULL CACHE ###");
+ cachefiles_state_changed(cache);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 230a1a2bf01d..3ccc8411c502 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -114,6 +114,21 @@ struct cachefiles_cache {
#include <trace/events/cachefiles.h>
+/*
+ * note change of state for daemon
+ */
+static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
+{
+ set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
+ wake_up_all(&cache->daemon_pollwq);
+}
+
+/*
+ * daemon.c
+ */
+extern int cachefiles_has_space(struct cachefiles_cache *cache,
+ unsigned fnr, unsigned bnr);
+
/*
* error_inject.c
*/
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 35/53] cachefiles: Implement a function to get/create a directory in the cache
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (33 preceding siblings ...)
2021-10-22 19:06 ` [PATCH v2 34/53] cachefiles: Provide a function to check how much space there is David Howells
@ 2021-10-22 19:07 ` David Howells
2021-10-22 19:07 ` [PATCH v2 36/53] cachefiles: Implement daemon UAPI and cache registration David Howells
` (19 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:07 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement a function to get/create structural directories in the cache.
This is used for setting up a cache and creating volume substructures.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/Makefile | 3 +
fs/cachefiles/internal.h | 7 ++
fs/cachefiles/namei.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 142 insertions(+), 1 deletion(-)
create mode 100644 fs/cachefiles/namei.c
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index 4c80d9af151f..06a87f78b88c 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -5,7 +5,8 @@
cachefiles-y := \
daemon.o \
- main.o
+ main.o \
+ namei.o
cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 3ccc8411c502..4e77c3004d98 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -168,6 +168,13 @@ static inline int cachefiles_inject_remove_error(void)
return cachefiles_error_injection_state & 2 ? -EIO : 0;
}
+/*
+ * namei.c
+ */
+extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
+ struct dentry *dir,
+ const char *name);
+
/*
* error handling
*/
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
new file mode 100644
index 000000000000..69915dde0a83
--- /dev/null
+++ b/fs/cachefiles/namei.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* CacheFiles path walking and related routines
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/fsnotify.h>
+#include <linux/quotaops.h>
+#include <linux/xattr.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+/*
+ * get a subdirectory
+ */
+struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
+ struct dentry *dir,
+ const char *dirname)
+{
+ struct dentry *subdir;
+ struct path path;
+ int ret;
+
+ _enter(",,%s", dirname);
+
+ /* search the current directory for the element name */
+ inode_lock(d_inode(dir));
+
+retry:
+ ret = cachefiles_inject_read_error();
+ if (ret == 0)
+ subdir = lookup_one_len(dirname, dir, strlen(dirname));
+ else
+ subdir = ERR_PTR(ret);
+ if (IS_ERR(subdir)) {
+ trace_cachefiles_vfs_error(NULL, d_backing_inode(dir),
+ PTR_ERR(subdir),
+ cachefiles_trace_lookup_error);
+ if (PTR_ERR(subdir) == -ENOMEM)
+ goto nomem_d_alloc;
+ goto lookup_error;
+ }
+
+ _debug("subdir -> %pd %s",
+ subdir, d_backing_inode(subdir) ? "positive" : "negative");
+
+ /* we need to create the subdir if it doesn't exist yet */
+ if (d_is_negative(subdir)) {
+ if (cache->store) {
+ ret = cachefiles_has_space(cache, 1, 0);
+ if (ret < 0)
+ goto mkdir_error;
+ }
+
+ _debug("attempt mkdir");
+
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ ret = security_path_mkdir(&path, subdir, 0700);
+ if (ret < 0)
+ goto mkdir_error;
+ ret = cachefiles_inject_write_error();
+ if (ret == 0)
+ ret = vfs_mkdir(&init_user_ns, d_inode(dir), subdir, 0700);
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(NULL, d_inode(dir), ret,
+ cachefiles_trace_mkdir_error);
+ goto mkdir_error;
+ }
+
+ if (unlikely(d_unhashed(subdir))) {
+ dput(subdir);
+ goto retry;
+ }
+ ASSERT(d_backing_inode(subdir));
+
+ _debug("mkdir -> %pd{ino=%lu}",
+ subdir, d_backing_inode(subdir)->i_ino);
+ }
+
+ inode_unlock(d_inode(dir));
+
+ /* we need to make sure the subdir is a directory */
+ ASSERT(d_backing_inode(subdir));
+
+ if (!d_can_lookup(subdir)) {
+ pr_err("%s is not a directory\n", dirname);
+ ret = -EIO;
+ goto check_error;
+ }
+
+ ret = -EPERM;
+ if (!(d_backing_inode(subdir)->i_opflags & IOP_XATTR) ||
+ !d_backing_inode(subdir)->i_op->lookup ||
+ !d_backing_inode(subdir)->i_op->mkdir ||
+ !d_backing_inode(subdir)->i_op->rename ||
+ !d_backing_inode(subdir)->i_op->rmdir ||
+ !d_backing_inode(subdir)->i_op->unlink)
+ goto check_error;
+
+ _leave(" = [%lu]", d_backing_inode(subdir)->i_ino);
+ return subdir;
+
+check_error:
+ dput(subdir);
+ _leave(" = %d [check]", ret);
+ return ERR_PTR(ret);
+
+mkdir_error:
+ inode_unlock(d_inode(dir));
+ dput(subdir);
+ pr_err("mkdir %s failed with error %d\n", dirname, ret);
+ return ERR_PTR(ret);
+
+lookup_error:
+ inode_unlock(d_inode(dir));
+ ret = PTR_ERR(subdir);
+ pr_err("Lookup %s failed with error %d\n", dirname, ret);
+ return ERR_PTR(ret);
+
+nomem_d_alloc:
+ inode_unlock(d_inode(dir));
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+}
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 36/53] cachefiles: Implement daemon UAPI and cache registration
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (34 preceding siblings ...)
2021-10-22 19:07 ` [PATCH v2 35/53] cachefiles: Implement a function to get/create a directory in the cache David Howells
@ 2021-10-22 19:07 ` David Howells
2021-10-22 19:07 ` [PATCH v2 37/53] cachefiles: Implement volume support David Howells
` (18 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:07 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Provide a number of parts of the cachefiles driver. Firstly, the daemon
UAPI interface:
(1) The miscdev file that is the point of contact with the cachefiled
daemon.
(2) An open method that will create a cache record.
(3) A write method by which the daemon can issue commands, a parser to
parse those commands and implementations for most of the commands (the
culling management is deferred to a separate patch).
(4) A read method by which the state of a cache can be queried.
(5) A release method that will cause the cache to be withdrawn from
service.
(6) A poll method that allows the daemon to check for culling state
changes.
Secondly, dealing with security and cache registration:
(1) Getting the cache cookie from fscache, preventing other caches from
trying to set it up for themselves, adding and withdrawing the cache.
(2) Looking up/creating the directories that form the structure of the
cache.
(3) Computing the credentials that will be used for cache access,
including security labels.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/Makefile | 5
fs/cachefiles/bind.c | 296 ++++++++++++++++++++++
fs/cachefiles/daemon.c | 600 +++++++++++++++++++++++++++++++++++++++++++++
fs/cachefiles/interface.c | 42 +++
fs/cachefiles/internal.h | 36 +++
fs/cachefiles/main.c | 13 +
fs/cachefiles/security.c | 112 ++++++++
7 files changed, 1103 insertions(+), 1 deletion(-)
create mode 100644 fs/cachefiles/bind.c
create mode 100644 fs/cachefiles/interface.c
create mode 100644 fs/cachefiles/security.c
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index 06a87f78b88c..7017c9113074 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -4,9 +4,12 @@
#
cachefiles-y := \
+ bind.o \
daemon.o \
+ interface.o \
main.o \
- namei.o
+ namei.o \
+ security.o
cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o
diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c
new file mode 100644
index 000000000000..9ca10290064b
--- /dev/null
+++ b/fs/cachefiles/bind.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Bind and unbind a cache from the filesystem backing it
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/statfs.h>
+#include <linux/ctype.h>
+#include <linux/xattr.h>
+#include <trace/events/fscache.h>
+#include "internal.h"
+
+DECLARE_WAIT_QUEUE_HEAD(cachefiles_clearance_wq);
+
+static int cachefiles_daemon_add_cache(struct cachefiles_cache *caches);
+
+/*
+ * bind a directory as a cache
+ */
+int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
+{
+ _enter("{%u,%u,%u,%u,%u,%u},%s",
+ cache->frun_percent,
+ cache->fcull_percent,
+ cache->fstop_percent,
+ cache->brun_percent,
+ cache->bcull_percent,
+ cache->bstop_percent,
+ args);
+
+ /* start by checking things over */
+ ASSERT(cache->fstop_percent < cache->fcull_percent &&
+ cache->fcull_percent < cache->frun_percent &&
+ cache->frun_percent < 100);
+
+ ASSERT(cache->bstop_percent < cache->bcull_percent &&
+ cache->bcull_percent < cache->brun_percent &&
+ cache->brun_percent < 100);
+
+ if (*args) {
+ pr_err("'bind' command doesn't take an argument\n");
+ return -EINVAL;
+ }
+
+ if (!cache->rootdirname) {
+ pr_err("No cache directory specified\n");
+ return -EINVAL;
+ }
+
+ /* don't permit already bound caches to be re-bound */
+ if (test_bit(CACHEFILES_READY, &cache->flags)) {
+ pr_err("Cache already bound\n");
+ return -EBUSY;
+ }
+
+ return cachefiles_daemon_add_cache(cache);
+}
+
+/*
+ * add a cache
+ */
+static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
+{
+ struct fscache_cache *cache_cookie;
+ struct path path;
+ struct kstatfs stats;
+ struct dentry *graveyard, *cachedir, *root;
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter("");
+
+ cache_cookie = fscache_acquire_cache(cache->tag);
+ if (IS_ERR(cache_cookie))
+ return PTR_ERR(cache_cookie);
+
+ if (!fscache_set_cache_state_maybe(cache_cookie,
+ FSCACHE_CACHE_IS_NOT_PRESENT,
+ FSCACHE_CACHE_IS_PREPARING)) {
+ pr_warn("Cache tag in use\n");
+ ret = -EBUSY;
+ goto error_preparing;
+ }
+
+ /* we want to work under the module's security ID */
+ ret = cachefiles_get_security_ID(cache);
+ if (ret < 0)
+ goto error_getsec;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+
+ /* look up the directory at the root of the cache */
+ ret = kern_path(cache->rootdirname, LOOKUP_DIRECTORY, &path);
+ if (ret < 0)
+ goto error_open_root;
+
+ cache->mnt = path.mnt;
+ root = path.dentry;
+
+ ret = -EINVAL;
+ if (mnt_user_ns(path.mnt) != &init_user_ns) {
+ pr_warn("File cache on idmapped mounts not supported");
+ goto error_unsupported;
+ }
+
+ /* check parameters */
+ ret = -EOPNOTSUPP;
+ if (d_is_negative(root) ||
+ !d_backing_inode(root)->i_op->lookup ||
+ !d_backing_inode(root)->i_op->mkdir ||
+ !(d_backing_inode(root)->i_opflags & IOP_XATTR) ||
+ !root->d_sb->s_op->statfs ||
+ !root->d_sb->s_op->sync_fs ||
+ root->d_sb->s_blocksize > PAGE_SIZE)
+ goto error_unsupported;
+
+ ret = -EROFS;
+ if (sb_rdonly(root->d_sb))
+ goto error_unsupported;
+
+ /* determine the security of the on-disk cache as this governs
+ * security ID of files we create */
+ ret = cachefiles_determine_cache_security(cache, root, &saved_cred);
+ if (ret < 0)
+ goto error_unsupported;
+
+ /* get the cache size and blocksize */
+ ret = vfs_statfs(&path, &stats);
+ if (ret < 0)
+ goto error_unsupported;
+
+ ret = -ERANGE;
+ if (stats.f_bsize <= 0)
+ goto error_unsupported;
+
+ ret = -EOPNOTSUPP;
+ if (stats.f_bsize > PAGE_SIZE)
+ goto error_unsupported;
+
+ cache->bsize = stats.f_bsize;
+ cache->bshift = 0;
+ if (stats.f_bsize < PAGE_SIZE)
+ cache->bshift = PAGE_SHIFT - ilog2(stats.f_bsize);
+
+ _debug("blksize %u (shift %u)",
+ cache->bsize, cache->bshift);
+
+ _debug("size %llu, avail %llu",
+ (unsigned long long) stats.f_blocks,
+ (unsigned long long) stats.f_bavail);
+
+ /* set up caching limits */
+ do_div(stats.f_files, 100);
+ cache->fstop = stats.f_files * cache->fstop_percent;
+ cache->fcull = stats.f_files * cache->fcull_percent;
+ cache->frun = stats.f_files * cache->frun_percent;
+
+ _debug("limits {%llu,%llu,%llu} files",
+ (unsigned long long) cache->frun,
+ (unsigned long long) cache->fcull,
+ (unsigned long long) cache->fstop);
+
+ stats.f_blocks >>= cache->bshift;
+ do_div(stats.f_blocks, 100);
+ cache->bstop = stats.f_blocks * cache->bstop_percent;
+ cache->bcull = stats.f_blocks * cache->bcull_percent;
+ cache->brun = stats.f_blocks * cache->brun_percent;
+
+ _debug("limits {%llu,%llu,%llu} blocks",
+ (unsigned long long) cache->brun,
+ (unsigned long long) cache->bcull,
+ (unsigned long long) cache->bstop);
+
+ /* get the cache directory and check its type */
+ cachedir = cachefiles_get_directory(cache, root, "cache");
+ if (IS_ERR(cachedir)) {
+ ret = PTR_ERR(cachedir);
+ goto error_unsupported;
+ }
+
+ cache->store = cachedir;
+
+ /* get the graveyard directory */
+ graveyard = cachefiles_get_directory(cache, root, "graveyard");
+ if (IS_ERR(graveyard)) {
+ ret = PTR_ERR(graveyard);
+ goto error_unsupported;
+ }
+
+ cache->graveyard = graveyard;
+ cache->cache = cache_cookie;
+
+ ret = fscache_add_cache(cache_cookie, &cachefiles_cache_ops, cache);
+ if (ret < 0)
+ goto error_add_cache;
+
+ /* done */
+ set_bit(CACHEFILES_READY, &cache->flags);
+ dput(root);
+
+ pr_info("File cache on %s registered\n", cache_cookie->name);
+
+ /* check how much space the cache has */
+ cachefiles_has_space(cache, 0, 0);
+ cachefiles_end_secure(cache, saved_cred);
+ _leave(" = 0 [%px]", cache->cache);
+ return 0;
+
+error_add_cache:
+ dput(cache->graveyard);
+ cache->graveyard = NULL;
+error_unsupported:
+ dput(cache->store);
+ cache->store = NULL;
+ mntput(cache->mnt);
+ cache->mnt = NULL;
+ dput(root);
+error_open_root:
+ cachefiles_end_secure(cache, saved_cred);
+error_getsec:
+ fscache_set_cache_state(cache_cookie, FSCACHE_CACHE_IS_NOT_PRESENT);
+error_preparing:
+ fscache_put_cache(cache_cookie, fscache_cache_put_cache);
+ cache->cache = NULL;
+ pr_err("Failed to register: %d\n", ret);
+ return ret;
+}
+
+/*
+ * Withdraw cache objects.
+ */
+static void cachefiles_withdraw_cache(struct cachefiles_cache *cache)
+{
+ struct fscache_cache *fscache = cache->cache;
+
+ pr_info("File cache on %s unregistering\n", fscache->name);
+
+ fscache_withdraw_cache(fscache);
+
+ /* we now have to destroy all the active objects pertaining to this
+ * cache - which we do by passing them off to thread pool to be
+ * disposed of */
+ // PLACEHOLDER: Withdraw objects
+
+ /* wait for all extant objects to finish their outstanding operations
+ * and go away */
+ _debug("wait for finish %u", atomic_read(&fscache->object_count));
+ wait_event(cachefiles_clearance_wq,
+ atomic_read(&fscache->object_count) == 0);
+ _debug("cleared");
+
+ // PLACEHOLDER: Withdraw volume
+
+ /* make sure all outstanding data is written to disk */
+ cachefiles_sync_cache(cache);
+
+ _debug("wait for clearance");
+ wait_event(cachefiles_clearance_wq, list_empty(&cache->object_list));
+
+ cache->cache = NULL;
+ fscache->ops = NULL;
+ fscache->cache_priv = NULL;
+ fscache_set_cache_state(fscache, FSCACHE_CACHE_IS_NOT_PRESENT);
+ fscache_put_cache(fscache, fscache_cache_put_withdraw);
+}
+
+/*
+ * unbind a cache on fd release
+ */
+void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
+{
+ _enter("%px", cache->cache);
+
+ if (test_bit(CACHEFILES_READY, &cache->flags))
+ cachefiles_withdraw_cache(cache);
+
+ dput(cache->graveyard);
+ dput(cache->store);
+ mntput(cache->mnt);
+
+ kfree(cache->rootdirname);
+ kfree(cache->secctx);
+ kfree(cache->tag);
+
+ _leave("");
+}
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index dca2520a14ee..c23d22a5d4a6 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -21,6 +21,606 @@
#include <linux/fs_struct.h>
#include "internal.h"
+static int cachefiles_daemon_open(struct inode *, struct file *);
+static int cachefiles_daemon_release(struct inode *, struct file *);
+static ssize_t cachefiles_daemon_read(struct file *, char __user *, size_t,
+ loff_t *);
+static ssize_t cachefiles_daemon_write(struct file *, const char __user *,
+ size_t, loff_t *);
+static __poll_t cachefiles_daemon_poll(struct file *,
+ struct poll_table_struct *);
+static int cachefiles_daemon_frun(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_fcull(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_fstop(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_brun(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_bcull(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_bstop(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_cull(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_debug(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_dir(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_inuse(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_secctx(struct cachefiles_cache *, char *);
+static int cachefiles_daemon_tag(struct cachefiles_cache *, char *);
+
+static unsigned long cachefiles_open;
+
+const struct file_operations cachefiles_daemon_fops = {
+ .owner = THIS_MODULE,
+ .open = cachefiles_daemon_open,
+ .release = cachefiles_daemon_release,
+ .read = cachefiles_daemon_read,
+ .write = cachefiles_daemon_write,
+ .poll = cachefiles_daemon_poll,
+ .llseek = noop_llseek,
+};
+
+struct cachefiles_daemon_cmd {
+ char name[8];
+ int (*handler)(struct cachefiles_cache *cache, char *args);
+};
+
+static const struct cachefiles_daemon_cmd cachefiles_daemon_cmds[] = {
+ { "bind", cachefiles_daemon_bind },
+ { "brun", cachefiles_daemon_brun },
+ { "bcull", cachefiles_daemon_bcull },
+ { "bstop", cachefiles_daemon_bstop },
+ { "cull", cachefiles_daemon_cull },
+ { "debug", cachefiles_daemon_debug },
+ { "dir", cachefiles_daemon_dir },
+ { "frun", cachefiles_daemon_frun },
+ { "fcull", cachefiles_daemon_fcull },
+ { "fstop", cachefiles_daemon_fstop },
+ { "inuse", cachefiles_daemon_inuse },
+ { "secctx", cachefiles_daemon_secctx },
+ { "tag", cachefiles_daemon_tag },
+ { "", NULL }
+};
+
+
+/*
+ * do various checks
+ */
+static int cachefiles_daemon_open(struct inode *inode, struct file *file)
+{
+ struct cachefiles_cache *cache;
+
+ _enter("");
+
+ /* only the superuser may do this */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ /* the cachefiles device may only be open once at a time */
+ if (xchg(&cachefiles_open, 1) == 1)
+ return -EBUSY;
+
+ /* allocate a cache record */
+ cache = kzalloc(sizeof(struct cachefiles_cache), GFP_KERNEL);
+ if (!cache) {
+ cachefiles_open = 0;
+ return -ENOMEM;
+ }
+
+ mutex_init(&cache->daemon_mutex);
+ init_waitqueue_head(&cache->daemon_pollwq);
+ INIT_LIST_HEAD(&cache->volumes);
+ INIT_LIST_HEAD(&cache->object_list);
+ spin_lock_init(&cache->object_list_lock);
+
+ /* set default caching limits
+ * - limit at 1% free space and/or free files
+ * - cull below 5% free space and/or free files
+ * - cease culling above 7% free space and/or free files
+ */
+ cache->frun_percent = 7;
+ cache->fcull_percent = 5;
+ cache->fstop_percent = 1;
+ cache->brun_percent = 7;
+ cache->bcull_percent = 5;
+ cache->bstop_percent = 1;
+
+ file->private_data = cache;
+ cache->cachefilesd = file;
+ return 0;
+}
+
+/*
+ * release a cache
+ */
+static int cachefiles_daemon_release(struct inode *inode, struct file *file)
+{
+ struct cachefiles_cache *cache = file->private_data;
+
+ _enter("");
+
+ ASSERT(cache);
+
+ set_bit(CACHEFILES_DEAD, &cache->flags);
+
+ cachefiles_daemon_unbind(cache);
+
+ /* clean up the control file interface */
+ cache->cachefilesd = NULL;
+ file->private_data = NULL;
+ cachefiles_open = 0;
+
+ kfree(cache);
+
+ _leave("");
+ return 0;
+}
+
+/*
+ * read the cache state
+ */
+static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer,
+ size_t buflen, loff_t *pos)
+{
+ struct cachefiles_cache *cache = file->private_data;
+ unsigned long long b_released;
+ unsigned f_released;
+ char buffer[256];
+ int n;
+
+ //_enter(",,%zu,", buflen);
+
+ if (!test_bit(CACHEFILES_READY, &cache->flags))
+ return 0;
+
+ /* check how much space the cache has */
+ cachefiles_has_space(cache, 0, 0);
+
+ /* summarise */
+ f_released = atomic_xchg(&cache->f_released, 0);
+ b_released = atomic_long_xchg(&cache->b_released, 0);
+ clear_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
+
+ n = snprintf(buffer, sizeof(buffer),
+ "cull=%c"
+ " frun=%llx"
+ " fcull=%llx"
+ " fstop=%llx"
+ " brun=%llx"
+ " bcull=%llx"
+ " bstop=%llx"
+ " freleased=%x"
+ " breleased=%llx",
+ test_bit(CACHEFILES_CULLING, &cache->flags) ? '1' : '0',
+ (unsigned long long) cache->frun,
+ (unsigned long long) cache->fcull,
+ (unsigned long long) cache->fstop,
+ (unsigned long long) cache->brun,
+ (unsigned long long) cache->bcull,
+ (unsigned long long) cache->bstop,
+ f_released,
+ b_released);
+
+ if (n > buflen)
+ return -EMSGSIZE;
+
+ if (copy_to_user(_buffer, buffer, n) != 0)
+ return -EFAULT;
+
+ return n;
+}
+
+/*
+ * command the cache
+ */
+static ssize_t cachefiles_daemon_write(struct file *file,
+ const char __user *_data,
+ size_t datalen,
+ loff_t *pos)
+{
+ const struct cachefiles_daemon_cmd *cmd;
+ struct cachefiles_cache *cache = file->private_data;
+ ssize_t ret;
+ char *data, *args, *cp;
+
+ //_enter(",,%zu,", datalen);
+
+ ASSERT(cache);
+
+ if (test_bit(CACHEFILES_DEAD, &cache->flags))
+ return -EIO;
+
+ if (datalen > PAGE_SIZE - 1)
+ return -EOPNOTSUPP;
+
+ /* drag the command string into the kernel so we can parse it */
+ data = memdup_user_nul(_data, datalen);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ ret = -EINVAL;
+ if (memchr(data, '\0', datalen))
+ goto error;
+
+ /* strip any newline */
+ cp = memchr(data, '\n', datalen);
+ if (cp) {
+ if (cp == data)
+ goto error;
+
+ *cp = '\0';
+ }
+
+ /* parse the command */
+ ret = -EOPNOTSUPP;
+
+ for (args = data; *args; args++)
+ if (isspace(*args))
+ break;
+ if (*args) {
+ if (args == data)
+ goto error;
+ *args = '\0';
+ args = skip_spaces(++args);
+ }
+
+ /* run the appropriate command handler */
+ for (cmd = cachefiles_daemon_cmds; cmd->name[0]; cmd++)
+ if (strcmp(cmd->name, data) == 0)
+ goto found_command;
+
+error:
+ kfree(data);
+ //_leave(" = %zd", ret);
+ return ret;
+
+found_command:
+ mutex_lock(&cache->daemon_mutex);
+
+ ret = -EIO;
+ if (!test_bit(CACHEFILES_DEAD, &cache->flags))
+ ret = cmd->handler(cache, args);
+
+ mutex_unlock(&cache->daemon_mutex);
+
+ if (ret == 0)
+ ret = datalen;
+ goto error;
+}
+
+/*
+ * poll for culling state
+ * - use EPOLLOUT to indicate culling state
+ */
+static __poll_t cachefiles_daemon_poll(struct file *file,
+ struct poll_table_struct *poll)
+{
+ struct cachefiles_cache *cache = file->private_data;
+ __poll_t mask;
+
+ poll_wait(file, &cache->daemon_pollwq, poll);
+ mask = 0;
+
+ if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags))
+ mask |= EPOLLIN;
+
+ if (test_bit(CACHEFILES_CULLING, &cache->flags))
+ mask |= EPOLLOUT;
+
+ return mask;
+}
+
+/*
+ * give a range error for cache space constraints
+ * - can be tail-called
+ */
+static int cachefiles_daemon_range_error(struct cachefiles_cache *cache,
+ char *args)
+{
+ pr_err("Free space limits must be in range 0%%<=stop<cull<run<100%%\n");
+
+ return -EINVAL;
+}
+
+/*
+ * set the percentage of files at which to stop culling
+ * - command: "frun <N>%"
+ */
+static int cachefiles_daemon_frun(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long frun;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ frun = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (frun <= cache->fcull_percent || frun >= 100)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->frun_percent = frun;
+ return 0;
+}
+
+/*
+ * set the percentage of files at which to start culling
+ * - command: "fcull <N>%"
+ */
+static int cachefiles_daemon_fcull(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long fcull;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ fcull = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (fcull <= cache->fstop_percent || fcull >= cache->frun_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->fcull_percent = fcull;
+ return 0;
+}
+
+/*
+ * set the percentage of files at which to stop allocating
+ * - command: "fstop <N>%"
+ */
+static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long fstop;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ fstop = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (fstop >= cache->fcull_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->fstop_percent = fstop;
+ return 0;
+}
+
+/*
+ * set the percentage of blocks at which to stop culling
+ * - command: "brun <N>%"
+ */
+static int cachefiles_daemon_brun(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long brun;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ brun = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (brun <= cache->bcull_percent || brun >= 100)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->brun_percent = brun;
+ return 0;
+}
+
+/*
+ * set the percentage of blocks at which to start culling
+ * - command: "bcull <N>%"
+ */
+static int cachefiles_daemon_bcull(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long bcull;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ bcull = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (bcull <= cache->bstop_percent || bcull >= cache->brun_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->bcull_percent = bcull;
+ return 0;
+}
+
+/*
+ * set the percentage of blocks at which to stop allocating
+ * - command: "bstop <N>%"
+ */
+static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long bstop;
+
+ _enter(",%s", args);
+
+ if (!*args)
+ return -EINVAL;
+
+ bstop = simple_strtoul(args, &args, 10);
+ if (args[0] != '%' || args[1] != '\0')
+ return -EINVAL;
+
+ if (bstop >= cache->bcull_percent)
+ return cachefiles_daemon_range_error(cache, args);
+
+ cache->bstop_percent = bstop;
+ return 0;
+}
+
+/*
+ * set the cache directory
+ * - command: "dir <name>"
+ */
+static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)
+{
+ char *dir;
+
+ _enter(",%s", args);
+
+ if (!*args) {
+ pr_err("Empty directory specified\n");
+ return -EINVAL;
+ }
+
+ if (cache->rootdirname) {
+ pr_err("Second cache directory specified\n");
+ return -EEXIST;
+ }
+
+ dir = kstrdup(args, GFP_KERNEL);
+ if (!dir)
+ return -ENOMEM;
+
+ cache->rootdirname = dir;
+ return 0;
+}
+
+/*
+ * set the cache security context
+ * - command: "secctx <ctx>"
+ */
+static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)
+{
+ char *secctx;
+
+ _enter(",%s", args);
+
+ if (!*args) {
+ pr_err("Empty security context specified\n");
+ return -EINVAL;
+ }
+
+ if (cache->secctx) {
+ pr_err("Second security context specified\n");
+ return -EINVAL;
+ }
+
+ secctx = kstrdup(args, GFP_KERNEL);
+ if (!secctx)
+ return -ENOMEM;
+
+ cache->secctx = secctx;
+ return 0;
+}
+
+/*
+ * set the cache tag
+ * - command: "tag <name>"
+ */
+static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)
+{
+ char *tag;
+
+ _enter(",%s", args);
+
+ if (!*args) {
+ pr_err("Empty tag specified\n");
+ return -EINVAL;
+ }
+
+ if (cache->tag)
+ return -EEXIST;
+
+ tag = kstrdup(args, GFP_KERNEL);
+ if (!tag)
+ return -ENOMEM;
+
+ cache->tag = tag;
+ return 0;
+}
+
+/*
+ * request a node in the cache be culled from the current working directory
+ * - command: "cull <name>"
+ */
+static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
+{
+ _enter(",%s", args);
+
+ if (strchr(args, '/'))
+ goto inval;
+
+ if (!test_bit(CACHEFILES_READY, &cache->flags)) {
+ pr_err("cull applied to unready cache\n");
+ return -EIO;
+ }
+
+ if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
+ pr_err("cull applied to dead cache\n");
+ return -EIO;
+ }
+
+ return -EOPNOTSUPP; // PLACEHOLDER: Implement culling
+
+inval:
+ pr_err("cull command requires dirfd and filename\n");
+ return -EINVAL;
+}
+
+/*
+ * set debugging mode
+ * - command: "debug <mask>"
+ */
+static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)
+{
+ unsigned long mask;
+
+ _enter(",%s", args);
+
+ mask = simple_strtoul(args, &args, 0);
+ if (args[0] != '\0')
+ goto inval;
+
+ cachefiles_debug = mask;
+ _leave(" = 0");
+ return 0;
+
+inval:
+ pr_err("debug command requires mask\n");
+ return -EINVAL;
+}
+
+/*
+ * find out whether an object in the current working directory is in use or not
+ * - command: "inuse <name>"
+ */
+static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
+{
+ //_enter(",%s", args);
+
+ if (strchr(args, '/'))
+ goto inval;
+
+ if (!test_bit(CACHEFILES_READY, &cache->flags)) {
+ pr_err("inuse applied to unready cache\n");
+ return -EIO;
+ }
+
+ if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
+ pr_err("inuse applied to dead cache\n");
+ return -EIO;
+ }
+
+ return -EOPNOTSUPP; // PLACEHOLDER: Implement check in use
+
+inval:
+ pr_err("inuse command requires dirfd and filename\n");
+ return -EINVAL;
+}
+
/*
* see if we have space for a number of pages and/or a number of files in the
* cache
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
new file mode 100644
index 000000000000..236d55c13fb1
--- /dev/null
+++ b/fs/cachefiles/interface.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* FS-Cache interface to CacheFiles
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/slab.h>
+#include <linux/mount.h>
+#include <linux/xattr.h>
+#include <linux/file.h>
+#include <linux/falloc.h>
+#include <trace/events/fscache.h>
+#include "internal.h"
+
+/*
+ * sync a cache
+ */
+void cachefiles_sync_cache(struct cachefiles_cache *cache)
+{
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter("%s", cache->cache->name);
+
+ /* make sure all pages pinned by operations on behalf of the netfs are
+ * written to disc */
+ cachefiles_begin_secure(cache, &saved_cred);
+ down_read(&cache->mnt->mnt_sb->s_umount);
+ ret = sync_filesystem(cache->mnt->mnt_sb);
+ up_read(&cache->mnt->mnt_sb->s_umount);
+ cachefiles_end_secure(cache, saved_cred);
+
+ if (ret == -EIO)
+ cachefiles_io_error(cache,
+ "Attempt to sync backing fs superblock returned error %d",
+ ret);
+}
+
+const struct fscache_cache_ops cachefiles_cache_ops = {
+ .name = "cachefiles",
+};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 4e77c3004d98..c472766cdce3 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -123,9 +123,19 @@ static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
wake_up_all(&cache->daemon_pollwq);
}
+/*
+ * bind.c
+ */
+extern wait_queue_head_t cachefiles_clearance_wq;
+
+extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args);
+extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
+
/*
* daemon.c
*/
+extern const struct file_operations cachefiles_daemon_fops;
+
extern int cachefiles_has_space(struct cachefiles_cache *cache,
unsigned fnr, unsigned bnr);
@@ -168,6 +178,12 @@ static inline int cachefiles_inject_remove_error(void)
return cachefiles_error_injection_state & 2 ? -EIO : 0;
}
+/*
+ * interface.c
+ */
+extern const struct fscache_cache_ops cachefiles_cache_ops;
+extern void cachefiles_sync_cache(struct cachefiles_cache *cache);
+
/*
* namei.c
*/
@@ -175,6 +191,26 @@ extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
struct dentry *dir,
const char *name);
+/*
+ * security.c
+ */
+extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
+extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
+ struct dentry *root,
+ const struct cred **_saved_cred);
+
+static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
+ const struct cred **_saved_cred)
+{
+ *_saved_cred = override_creds(cache->cache_cred);
+}
+
+static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
+ const struct cred *saved_cred)
+{
+ revert_creds(saved_cred);
+}
+
/*
* error handling
*/
diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c
index 387d42c7185f..22581099236b 100644
--- a/fs/cachefiles/main.c
+++ b/fs/cachefiles/main.c
@@ -31,6 +31,12 @@ MODULE_DESCRIPTION("Mounted-filesystem based cache");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
+static struct miscdevice cachefiles_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "cachefiles",
+ .fops = &cachefiles_daemon_fops,
+};
+
/*
* initialise the fs caching module
*/
@@ -42,9 +48,15 @@ static int __init cachefiles_init(void)
if (ret < 0)
goto error_einj;
+ ret = misc_register(&cachefiles_dev);
+ if (ret < 0)
+ goto error_dev;
+
pr_info("Loaded\n");
return 0;
+error_dev:
+ cachefiles_unregister_error_injection();
error_einj:
pr_err("failed to register: %d\n", ret);
return ret;
@@ -59,6 +71,7 @@ static void __exit cachefiles_exit(void)
{
pr_info("Unloading\n");
+ misc_deregister(&cachefiles_dev);
cachefiles_unregister_error_injection();
}
diff --git a/fs/cachefiles/security.c b/fs/cachefiles/security.c
new file mode 100644
index 000000000000..51daa986aca3
--- /dev/null
+++ b/fs/cachefiles/security.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* CacheFiles security management
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/fs.h>
+#include <linux/cred.h>
+#include "internal.h"
+
+/*
+ * determine the security context within which we access the cache from within
+ * the kernel
+ */
+int cachefiles_get_security_ID(struct cachefiles_cache *cache)
+{
+ struct cred *new;
+ int ret;
+
+ _enter("{%s}", cache->secctx);
+
+ new = prepare_kernel_cred(current);
+ if (!new) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ if (cache->secctx) {
+ ret = set_security_override_from_ctx(new, cache->secctx);
+ if (ret < 0) {
+ put_cred(new);
+ pr_err("Security denies permission to nominate security context: error %d\n",
+ ret);
+ goto error;
+ }
+ }
+
+ cache->cache_cred = new;
+ ret = 0;
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * see if mkdir and create can be performed in the root directory
+ */
+static int cachefiles_check_cache_dir(struct cachefiles_cache *cache,
+ struct dentry *root)
+{
+ int ret;
+
+ ret = security_inode_mkdir(d_backing_inode(root), root, 0);
+ if (ret < 0) {
+ pr_err("Security denies permission to make dirs: error %d",
+ ret);
+ return ret;
+ }
+
+ ret = security_inode_create(d_backing_inode(root), root, 0);
+ if (ret < 0)
+ pr_err("Security denies permission to create files: error %d",
+ ret);
+
+ return ret;
+}
+
+/*
+ * check the security details of the on-disk cache
+ * - must be called with security override in force
+ * - must return with a security override in force - even in the case of an
+ * error
+ */
+int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
+ struct dentry *root,
+ const struct cred **_saved_cred)
+{
+ struct cred *new;
+ int ret;
+
+ _enter("");
+
+ /* duplicate the cache creds for COW (the override is currently in
+ * force, so we can use prepare_creds() to do this) */
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ cachefiles_end_secure(cache, *_saved_cred);
+
+ /* use the cache root dir's security context as the basis with
+ * which create files */
+ ret = set_create_files_as(new, d_backing_inode(root));
+ if (ret < 0) {
+ abort_creds(new);
+ cachefiles_begin_secure(cache, _saved_cred);
+ _leave(" = %d [cfa]", ret);
+ return ret;
+ }
+
+ put_cred(cache->cache_cred);
+ cache->cache_cred = new;
+
+ cachefiles_begin_secure(cache, _saved_cred);
+ ret = cachefiles_check_cache_dir(cache, root);
+
+ if (ret == -EOPNOTSUPP)
+ ret = 0;
+ _leave(" = %d", ret);
+ return ret;
+}
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 37/53] cachefiles: Implement volume support
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (35 preceding siblings ...)
2021-10-22 19:07 ` [PATCH v2 36/53] cachefiles: Implement daemon UAPI and cache registration David Howells
@ 2021-10-22 19:07 ` David Howells
2021-10-22 19:07 ` [PATCH v2 38/53] cachefiles: Implement data storage object handling David Howells
` (17 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:07 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement support for creating the directory layout for a volume on disk
and setting up and withdrawing volume caching.
Each volume has a directory named for the volume key under the root of the
cache (prefixed with an 'I' to indicate to cachefilesd that it's an index)
and then creates a bunch of hash bucket subdirectories under that (named as
'@' plus a hex number) in which cookie files will be created.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/Makefile | 3 +
fs/cachefiles/bind.c | 28 +++++++++-
fs/cachefiles/interface.c | 2 +
fs/cachefiles/internal.h | 7 ++
fs/cachefiles/volume.c | 128 +++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 166 insertions(+), 2 deletions(-)
create mode 100644 fs/cachefiles/volume.c
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index 7017c9113074..607f7c684a97 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -9,7 +9,8 @@ cachefiles-y := \
interface.o \
main.o \
namei.o \
- security.o
+ security.o \
+ volume.o
cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o
diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c
index 9ca10290064b..70924997b0cc 100644
--- a/fs/cachefiles/bind.c
+++ b/fs/cachefiles/bind.c
@@ -236,6 +236,32 @@ static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
return ret;
}
+/*
+ * Withdraw volumes.
+ */
+static void cachefiles_withdraw_volumes(struct cachefiles_cache *cache)
+{
+ _enter("");
+
+ for (;;) {
+ struct cachefiles_volume *volume = NULL;
+
+ spin_lock(&cache->object_list_lock);
+ if (!list_empty(&cache->volumes)) {
+ volume = list_first_entry(&cache->volumes,
+ struct cachefiles_volume, cache_link);
+ list_del_init(&volume->cache_link);
+ }
+ spin_unlock(&cache->object_list_lock);
+ if (!volume)
+ break;
+
+ cachefiles_withdraw_volume(volume);
+ }
+
+ _leave("");
+}
+
/*
* Withdraw cache objects.
*/
@@ -259,7 +285,7 @@ static void cachefiles_withdraw_cache(struct cachefiles_cache *cache)
atomic_read(&fscache->object_count) == 0);
_debug("cleared");
- // PLACEHOLDER: Withdraw volume
+ cachefiles_withdraw_volumes(cache);
/* make sure all outstanding data is written to disk */
cachefiles_sync_cache(cache);
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 236d55c13fb1..8624ee52b98b 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -39,4 +39,6 @@ void cachefiles_sync_cache(struct cachefiles_cache *cache)
const struct fscache_cache_ops cachefiles_cache_ops = {
.name = "cachefiles",
+ .acquire_volume = cachefiles_acquire_volume,
+ .free_volume = cachefiles_free_volume,
};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index c472766cdce3..828b888a8bf3 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -211,6 +211,13 @@ static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
revert_creds(saved_cred);
}
+/*
+ * volume.c
+ */
+void cachefiles_acquire_volume(struct fscache_volume *volume);
+void cachefiles_free_volume(struct fscache_volume *volume);
+void cachefiles_withdraw_volume(struct cachefiles_volume *volume);
+
/*
* error handling
*/
diff --git a/fs/cachefiles/volume.c b/fs/cachefiles/volume.c
new file mode 100644
index 000000000000..f5e527b56228
--- /dev/null
+++ b/fs/cachefiles/volume.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Volume handling.
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include "internal.h"
+#include <trace/events/fscache.h>
+
+/*
+ * Allocate and set up a volume representation. We make sure all the fanout
+ * directories are created and pinned.
+ */
+void cachefiles_acquire_volume(struct fscache_volume *vcookie)
+{
+ struct cachefiles_volume *volume;
+ struct cachefiles_cache *cache = vcookie->cache->cache_priv;
+ const struct cred *saved_cred;
+ struct dentry *vdentry, *fan;
+ size_t len;
+ char *name;
+ int n_accesses, i;
+
+ _enter("");
+
+ volume = kzalloc(sizeof(struct cachefiles_volume), GFP_KERNEL);
+ if (!volume)
+ return;
+ volume->vcookie = vcookie;
+ volume->cache = cache;
+ INIT_LIST_HEAD(&volume->cache_link);
+
+ cachefiles_begin_secure(cache, &saved_cred);
+
+ len = vcookie->key[0];
+ name = kmalloc(len + 3, GFP_NOFS);
+ if (!name)
+ goto error_vol;
+ name[0] = 'I';
+ memcpy(name + 1, vcookie->key + 1, len);
+ name[len + 1] = 0;
+
+ vdentry = cachefiles_get_directory(cache, cache->store, name);
+ if (IS_ERR(vdentry))
+ goto error_name;
+ volume->dentry = vdentry;
+
+ for (i = 0; i < 256; i++) {
+ sprintf(name, "@%02x", i);
+ fan = cachefiles_get_directory(cache, vdentry, name);
+ if (IS_ERR(fan))
+ goto error_fan;
+ volume->fanout[i] = fan;
+ }
+
+ cachefiles_end_secure(cache, saved_cred);
+
+ vcookie->cache_priv = volume;
+ n_accesses = atomic_inc_return(&vcookie->n_accesses); /* Stop wakeups on dec-to-0 */
+ trace_fscache_access_volume(vcookie->debug_id, refcount_read(&vcookie->ref),
+ n_accesses, fscache_access_cache_pin);
+
+ spin_lock(&cache->object_list_lock);
+ list_add(&volume->cache_link, &volume->cache->volumes);
+ spin_unlock(&cache->object_list_lock);
+
+ kfree(name);
+ return;
+
+error_fan:
+ for (i = 0; i < 256; i++)
+ dput(volume->fanout[i]);
+ dput(volume->dentry);
+error_name:
+ kfree(name);
+error_vol:
+ kfree(volume);
+ cachefiles_end_secure(cache, saved_cred);
+}
+
+/*
+ * Release a volume representation.
+ */
+static void __cachefiles_free_volume(struct cachefiles_volume *volume)
+{
+ int i;
+
+ _enter("");
+
+ volume->vcookie->cache_priv = NULL;
+
+ for (i = 0; i < 256; i++)
+ dput(volume->fanout[i]);
+ dput(volume->dentry);
+ kfree(volume);
+}
+
+void cachefiles_free_volume(struct fscache_volume *vcookie)
+{
+ struct cachefiles_volume *volume = vcookie->cache_priv;
+
+ if (volume) {
+ spin_lock(&volume->cache->object_list_lock);
+ list_del_init(&volume->cache_link);
+ spin_unlock(&volume->cache->object_list_lock);
+ __cachefiles_free_volume(volume);
+ }
+}
+
+void cachefiles_withdraw_volume(struct cachefiles_volume *volume)
+{
+ struct fscache_volume *vcookie = volume->vcookie;
+ int n_accesses;
+
+ _debug("withdraw V=%x", vcookie->debug_id);
+
+ /* Allow wakeups on dec-to-0 */
+ n_accesses = atomic_dec_return(&vcookie->n_accesses);
+ trace_fscache_access_volume(vcookie->debug_id, refcount_read(&vcookie->ref),
+ n_accesses, fscache_access_cache_unpin);
+
+ wait_var_event(&vcookie->n_accesses,
+ atomic_read(&vcookie->n_accesses) == 0);
+ __cachefiles_free_volume(volume);
+}
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 38/53] cachefiles: Implement data storage object handling
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (36 preceding siblings ...)
2021-10-22 19:07 ` [PATCH v2 37/53] cachefiles: Implement volume support David Howells
@ 2021-10-22 19:07 ` David Howells
2021-10-22 19:07 ` [PATCH v2 39/53] cachefiles: Implement begin and end I/O David Howells
` (16 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:07 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement the handling of data storage objects, including the following
pieces:
(1) An S_KERNEL_FILE inode flag is provided that a kernel service,
e.g. cachefiles, can set to ward off other kernel services and drivers
(including itself) from using files it is actively using.
(2) Allocation of a cachefiles_object struct for storing state.
(3) Rendering the binary key into something that can be used as a
filename. A number of encoding are considered, including plain text,
hex rendering of arrays of le32 or be32 words or a base64 encoding.
(4) Lookup and creation of a file on disk, using a tmpfile if the file
isn't yet present. The file is then opened, sized for DIO and the
file handle is attached to the cachefiles_object struct. The inode is
marked S_KERNEL_FILE to indicate that it's in use by a kernel service.
(5) Reading and checking the xattr on a file to check coherency,
(6) Resizing an object, using truncate and/or fallocate to adjust the
object.
(7) Invalidation of an object, creating a tmpfile and switching the file
pointer in the cachefiles object.
(8) Committing a file to disk, including setting the coherency xattr on it
and, if necessary, creating a hard link to it.
Note that this would be a good place to use Omar Sandoval's vfs_link()
with AT_LINK_REPLACE[1] as I may have to unlink an old file before I
can link a tmpfile into place.
(9) Withdrawal of open objects when a cache is being withdrawn or a cookie
is relinquished. This involves committing or discarding the file.
(10) Culling a file at the behest of the daemon.
(11) A method by which the daemon can query to see if a file is in use by
the cache.
Changes
=======
ver #2)
- Disabled a debugging statement.
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/163363935000.1980952.15279841414072653108.stgit@warthog.procyon.org.uk [1]
cc: linux-cachefs@redhat.com
---
fs/cachefiles/Makefile | 4
fs/cachefiles/bind.c | 32 ++
fs/cachefiles/daemon.c | 46 ++
fs/cachefiles/interface.c | 438 ++++++++++++++++++++++
fs/cachefiles/internal.h | 57 +++
fs/cachefiles/key.c | 142 +++++++
fs/cachefiles/main.c | 16 +
fs/cachefiles/namei.c | 739 +++++++++++++++++++++++++++++++++++++
fs/cachefiles/xattr.c | 181 +++++++++
include/linux/fs.h | 1
include/trace/events/cachefiles.h | 354 ++++++++++++++++++
include/trace/events/fscache.h | 4
12 files changed, 2010 insertions(+), 4 deletions(-)
create mode 100644 fs/cachefiles/key.c
create mode 100644 fs/cachefiles/xattr.c
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index 607f7c684a97..5dd99ca8df05 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -7,10 +7,12 @@ cachefiles-y := \
bind.o \
daemon.o \
interface.o \
+ key.o \
main.o \
namei.o \
security.o \
- volume.o
+ volume.o \
+ xattr.o
cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o
diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c
index 70924997b0cc..59c9d141f1fe 100644
--- a/fs/cachefiles/bind.c
+++ b/fs/cachefiles/bind.c
@@ -236,6 +236,36 @@ static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
return ret;
}
+/*
+ * Mark all the objects as being out of service and queue them all for cleanup.
+ */
+static void cachefiles_withdraw_objects(struct cachefiles_cache *cache)
+{
+ struct cachefiles_object *object;
+ unsigned int count = 0;
+
+ _enter("");
+
+ spin_lock(&cache->object_list_lock);
+
+ while (!list_empty(&cache->object_list)) {
+ object = list_first_entry(&cache->object_list,
+ struct cachefiles_object, cache_link);
+ cachefiles_see_object(object, cachefiles_obj_see_withdrawal);
+ list_del_init(&object->cache_link);
+ fscache_withdraw_cookie(object->cookie);
+ count++;
+ if ((count & 63) == 0) {
+ spin_unlock(&cache->object_list_lock);
+ cond_resched();
+ spin_lock(&cache->object_list_lock);
+ }
+ }
+
+ spin_unlock(&cache->object_list_lock);
+ _leave(" [%u objs]", count);
+}
+
/*
* Withdraw volumes.
*/
@@ -276,7 +306,7 @@ static void cachefiles_withdraw_cache(struct cachefiles_cache *cache)
/* we now have to destroy all the active objects pertaining to this
* cache - which we do by passing them off to thread pool to be
* disposed of */
- // PLACEHOLDER: Withdraw objects
+ cachefiles_withdraw_objects(cache);
/* wait for all extant objects to finish their outstanding operations
* and go away */
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index c23d22a5d4a6..50ec292c7213 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -548,6 +548,10 @@ static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)
*/
static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
{
+ struct path path;
+ const struct cred *saved_cred;
+ int ret;
+
_enter(",%s", args);
if (strchr(args, '/'))
@@ -563,7 +567,24 @@ static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
return -EIO;
}
- return -EOPNOTSUPP; // PLACEHOLDER: Implement culling
+ /* extract the directory dentry from the cwd */
+ get_fs_pwd(current->fs, &path);
+
+ if (!d_can_lookup(path.dentry))
+ goto notdir;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = cachefiles_cull(cache, path.dentry, args);
+ cachefiles_end_secure(cache, saved_cred);
+
+ path_put(&path);
+ _leave(" = %d", ret);
+ return ret;
+
+notdir:
+ path_put(&path);
+ pr_err("cull command requires dirfd to be a directory\n");
+ return -ENOTDIR;
inval:
pr_err("cull command requires dirfd and filename\n");
@@ -599,6 +620,10 @@ static int cachefiles_daemon_debug(struct cachefiles_cache *cache, char *args)
*/
static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
{
+ struct path path;
+ const struct cred *saved_cred;
+ int ret;
+
//_enter(",%s", args);
if (strchr(args, '/'))
@@ -614,7 +639,24 @@ static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
return -EIO;
}
- return -EOPNOTSUPP; // PLACEHOLDER: Implement check in use
+ /* extract the directory dentry from the cwd */
+ get_fs_pwd(current->fs, &path);
+
+ if (!d_can_lookup(path.dentry))
+ goto notdir;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = cachefiles_check_in_use(cache, path.dentry, args);
+ cachefiles_end_secure(cache, saved_cred);
+
+ path_put(&path);
+ //_leave(" = %d", ret);
+ return ret;
+
+notdir:
+ path_put(&path);
+ pr_err("inuse command requires dirfd to be a directory\n");
+ return -ENOTDIR;
inval:
pr_err("inuse command requires dirfd and filename\n");
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 8624ee52b98b..b4a0bd2e803f 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -13,6 +13,310 @@
#include <trace/events/fscache.h>
#include "internal.h"
+static atomic_t cachefiles_object_debug_id;
+
+static int cachefiles_attr_changed(struct cachefiles_object *object);
+
+/*
+ * Allocate a cache object record.
+ */
+static
+struct cachefiles_object *cachefiles_alloc_object(struct fscache_cookie *cookie)
+{
+ struct fscache_volume *vcookie = cookie->volume;
+ struct cachefiles_object *object;
+ struct cachefiles_volume *volume = vcookie->cache_priv;
+ int n_accesses;
+
+ _enter("{%s},%x,", vcookie->key, cookie->debug_id);
+
+ object = kmem_cache_zalloc(cachefiles_object_jar, cachefiles_gfp);
+ if (!object)
+ return NULL;
+
+ atomic_set(&object->usage, 1);
+
+ spin_lock_init(&object->lock);
+ INIT_LIST_HEAD(&object->cache_link);
+ object->volume = volume;
+ object->debug_id = atomic_inc_return(&cachefiles_object_debug_id);
+ object->cookie = fscache_get_cookie(cookie, fscache_cookie_get_attach_object);
+
+ atomic_inc(&vcookie->cache->object_count);
+ trace_cachefiles_ref(object->debug_id, cookie->debug_id, 1,
+ cachefiles_obj_new);
+
+ /* Get a ref on the cookie and keep its n_accesses counter raised by 1
+ * to prevent wakeups from transitioning it to 0 until we're
+ * withdrawing caching services from it.
+ */
+ n_accesses = atomic_inc_return(&cookie->n_accesses);
+ trace_fscache_access(cookie->debug_id, refcount_read(&cookie->ref),
+ n_accesses, fscache_access_cache_pin);
+ set_bit(FSCACHE_COOKIE_NACC_ELEVATED, &cookie->flags);
+ return object;
+}
+
+/*
+ * Attempt to look up the nominated node in this cache
+ */
+static bool cachefiles_lookup_cookie(struct fscache_cookie *cookie)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache = cookie->volume->cache->cache_priv;
+ const struct cred *saved_cred;
+ bool success;
+
+ object = cachefiles_alloc_object(cookie);
+ if (!object)
+ goto fail;
+
+ _enter("{OBJ%x}", object->debug_id);
+
+ if (!cachefiles_cook_key(object))
+ goto fail_put;
+
+ cookie->cache_priv = object;
+
+ /* look up the key, creating any missing bits */
+ cachefiles_begin_secure(cache, &saved_cred);
+ success = cachefiles_look_up_object(object);
+ cachefiles_end_secure(cache, saved_cred);
+
+ if (!success)
+ goto fail_withdraw;
+
+ cachefiles_see_object(object, cachefiles_obj_see_lookup_cookie);
+
+ spin_lock(&cache->object_list_lock);
+ list_add(&object->cache_link, &cache->object_list);
+ spin_unlock(&cache->object_list_lock);
+ cachefiles_attr_changed(object);
+ _leave(" = t");
+ return true;
+
+fail_withdraw:
+ cachefiles_see_object(object, cachefiles_obj_see_lookup_failed);
+ clear_bit(FSCACHE_COOKIE_IS_CACHING, &object->flags);
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_FAILED);
+ _debug("failed c=%08x o=%08x", cookie->debug_id, object->debug_id);
+ /* The caller holds an access count on the cookie, so we need them to
+ * drop it before we can withdraw the object.
+ */
+ return false;
+
+fail_put:
+ cachefiles_put_object(object, cachefiles_obj_put_alloc_fail);
+fail:
+ return false;
+}
+
+/*
+ * Note that an object has been seen.
+ */
+void cachefiles_see_object(struct cachefiles_object *object,
+ enum cachefiles_obj_ref_trace why)
+{
+ trace_cachefiles_ref(object->debug_id, object->cookie->debug_id,
+ atomic_read(&object->usage), why);
+}
+
+/*
+ * increment the usage count on an inode object (may fail if unmounting)
+ */
+struct cachefiles_object *cachefiles_grab_object(struct cachefiles_object *object,
+ enum cachefiles_obj_ref_trace why)
+{
+ int u;
+
+ u = atomic_inc_return(&object->usage);
+ trace_cachefiles_ref(object->debug_id, object->cookie->debug_id, u, why);
+ return object;
+}
+
+/*
+ * Shorten the backing object to discard any dirty data and free up
+ * any unused granules.
+ */
+static bool cachefiles_shorten_object(struct cachefiles_object *object,
+ struct file *file, loff_t new_size)
+{
+ struct cachefiles_cache *cache = object->volume->cache;
+ struct inode *inode = file_inode(file);
+ loff_t i_size, dio_size;
+ int ret;
+
+ dio_size = round_up(new_size, CACHEFILES_DIO_BLOCK_SIZE);
+ i_size = i_size_read(inode);
+
+ trace_cachefiles_trunc(object, inode, i_size, dio_size,
+ cachefiles_trunc_shrink);
+ ret = cachefiles_inject_remove_error();
+ if (ret == 0)
+ ret = vfs_truncate(&file->f_path, dio_size);
+ if (ret < 0) {
+ trace_cachefiles_io_error(object, file_inode(file), ret,
+ cachefiles_trace_trunc_error);
+ cachefiles_io_error_obj(object, "Trunc-to-size failed %d", ret);
+ cachefiles_remove_object_xattr(cache, object, file->f_path.dentry);
+ return false;
+ }
+
+ if (new_size < dio_size) {
+ trace_cachefiles_trunc(object, inode, dio_size, new_size,
+ cachefiles_trunc_dio_adjust);
+ ret = cachefiles_inject_write_error();
+ if (ret == 0)
+ ret = vfs_fallocate(file, FALLOC_FL_ZERO_RANGE,
+ new_size, dio_size);
+ if (ret < 0) {
+ trace_cachefiles_io_error(object, file_inode(file), ret,
+ cachefiles_trace_fallocate_error);
+ cachefiles_io_error_obj(object, "Trunc-to-dio-size failed %d", ret);
+ cachefiles_remove_object_xattr(cache, object, file->f_path.dentry);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/*
+ * Resize the backing object.
+ */
+static void cachefiles_resize_cookie(struct netfs_cache_resources *cres,
+ loff_t new_size)
+{
+ struct cachefiles_object *object = cachefiles_cres_object(cres);
+ struct cachefiles_cache *cache = object->volume->cache;
+ struct fscache_cookie *cookie = object->cookie;
+ const struct cred *saved_cred;
+ struct file *file = cachefiles_cres_file(cres);
+ loff_t old_size = cookie->object_size;
+
+ _enter("%llu->%llu", old_size, new_size);
+
+ if (new_size < old_size) {
+ cachefiles_begin_secure(cache, &saved_cred);
+ cachefiles_shorten_object(object, file, new_size);
+ cachefiles_end_secure(cache, saved_cred);
+ object->cookie->object_size = new_size;
+ return;
+ }
+
+ /* The file is being expanded. We don't need to do anything
+ * particularly. cookie->initial_size doesn't change and so the point
+ * at which we have to download before doesn't change.
+ */
+ cookie->object_size = new_size;
+}
+
+/*
+ * Commit changes to the object as we drop it.
+ */
+static void cachefiles_commit_object(struct cachefiles_object *object,
+ struct cachefiles_cache *cache)
+{
+ bool update = false;
+
+ if (test_and_clear_bit(FSCACHE_COOKIE_LOCAL_WRITE, &object->cookie->flags))
+ update = true;
+ if (test_and_clear_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags))
+ update = true;
+ if (update)
+ cachefiles_set_object_xattr(object);
+
+ if (test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags))
+ cachefiles_commit_tmpfile(cache, object);
+}
+
+/*
+ * Finalise and object and close the VFS structs that we have.
+ */
+static void cachefiles_clean_up_object(struct cachefiles_object *object,
+ struct cachefiles_cache *cache)
+{
+ if (test_bit(FSCACHE_COOKIE_RETIRED, &object->cookie->flags)) {
+ if (!test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags)) {
+ cachefiles_see_object(object, cachefiles_obj_see_clean_delete);
+ _debug("- inval object OBJ%x", object->debug_id);
+ cachefiles_delete_object(object, FSCACHE_OBJECT_WAS_RETIRED);
+ } else {
+ cachefiles_see_object(object, cachefiles_obj_see_clean_drop_tmp);
+ _debug("- inval object OBJ%x tmpfile", object->debug_id);
+ }
+ } else {
+ cachefiles_see_object(object, cachefiles_obj_see_clean_commit);
+ cachefiles_commit_object(object, cache);
+ }
+
+ cachefiles_unmark_inode_in_use(object, object->file);
+ if (object->file) {
+ fput(object->file);
+ object->file = NULL;
+ }
+}
+
+/*
+ * Withdraw caching for a cookie.
+ */
+static void cachefiles_withdraw_cookie(struct fscache_cookie *cookie)
+{
+ struct cachefiles_object *object = cookie->cache_priv;
+ struct cachefiles_cache *cache = object->volume->cache;
+ const struct cred *saved_cred;
+
+ _enter("o=%x", object->debug_id);
+ cachefiles_see_object(object, cachefiles_obj_see_withdraw_cookie);
+
+ if (!list_empty(&object->cache_link)) {
+ spin_lock(&cache->object_list_lock);
+ cachefiles_see_object(object, cachefiles_obj_see_withdrawal);
+ list_del_init(&object->cache_link);
+ spin_unlock(&cache->object_list_lock);
+ }
+
+ if (object->file) {
+ cachefiles_begin_secure(cache, &saved_cred);
+ cachefiles_clean_up_object(object, cache);
+ cachefiles_end_secure(cache, saved_cred);
+ }
+
+ cookie->cache_priv = NULL;
+ cachefiles_put_object(object, cachefiles_obj_put_detach);
+}
+
+/*
+ * dispose of a reference to an object
+ */
+void cachefiles_put_object(struct cachefiles_object *object,
+ enum cachefiles_obj_ref_trace why)
+{
+ unsigned int object_debug_id = object->debug_id;
+ unsigned int cookie_debug_id = object->cookie->debug_id;
+ struct fscache_cache *cache;
+ int u;
+
+ u = atomic_dec_return(&object->usage);
+ trace_cachefiles_ref(object_debug_id, cookie_debug_id, u, why);
+ if (u == 0) {
+ _debug("- kill object OBJ%x", object_debug_id);
+
+ ASSERTCMP(object->file, ==, NULL);
+
+ kfree(object->d_name);
+
+ cache = object->volume->cache->cache;
+ fscache_put_cookie(object->cookie, fscache_cookie_put_object);
+ object->cookie = NULL;
+ kmem_cache_free(cachefiles_object_jar, object);
+ if (atomic_dec_and_test(&cache->object_count))
+ wake_up_all(&cachefiles_clearance_wq);
+ }
+
+ _leave("");
+}
+
/*
* sync a cache
*/
@@ -37,8 +341,142 @@ void cachefiles_sync_cache(struct cachefiles_cache *cache)
ret);
}
+/*
+ * notification the attributes on an object have changed
+ * - called with reads/writes excluded by FS-Cache
+ */
+static int cachefiles_attr_changed(struct cachefiles_object *object)
+{
+ struct cachefiles_cache *cache = object->volume->cache;
+ const struct cred *saved_cred;
+ struct iattr newattrs;
+ struct file *file = object->file;
+ uint64_t ni_size;
+ loff_t oi_size;
+ int ret;
+
+ ni_size = object->cookie->object_size;
+ ni_size = round_up(ni_size, CACHEFILES_DIO_BLOCK_SIZE);
+
+ _enter("{OBJ%x},[%llu]",
+ object->debug_id, (unsigned long long) ni_size);
+
+ if (!file)
+ return -ENOBUFS;
+
+ oi_size = i_size_read(file_inode(file));
+ if (oi_size == ni_size)
+ return 0;
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ inode_lock(file_inode(file));
+
+ /* if there's an extension to a partial page at the end of the backing
+ * file, we need to discard the partial page so that we pick up new
+ * data after it */
+ if (oi_size & ~PAGE_MASK && ni_size > oi_size) {
+ _debug("discard tail %llx", oi_size);
+ newattrs.ia_valid = ATTR_SIZE;
+ newattrs.ia_size = oi_size & PAGE_MASK;
+ ret = cachefiles_inject_remove_error();
+ if (ret == 0)
+ ret = notify_change(&init_user_ns, file->f_path.dentry,
+ &newattrs, NULL);
+ if (ret < 0)
+ goto truncate_failed;
+ }
+
+ newattrs.ia_valid = ATTR_SIZE;
+ newattrs.ia_size = ni_size;
+ ret = cachefiles_inject_write_error();
+ if (ret == 0)
+ ret = notify_change(&init_user_ns, file->f_path.dentry,
+ &newattrs, NULL);
+
+truncate_failed:
+ inode_unlock(file_inode(file));
+ cachefiles_end_secure(cache, saved_cred);
+
+ if (ret < 0)
+ trace_cachefiles_io_error(NULL, file_inode(file), ret,
+ cachefiles_trace_notify_change_error);
+ if (ret == -EIO) {
+ cachefiles_io_error_obj(object, "Size set failed");
+ ret = -ENOBUFS;
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Invalidate the storage associated with a cookie.
+ */
+static bool cachefiles_invalidate_cookie(struct fscache_cookie *cookie)
+{
+ struct cachefiles_object *object = cookie->cache_priv;
+ struct file *new_file, *old_file;
+ bool old_tmpfile;
+
+ _enter("o=%x,[%llu]", object->debug_id, object->cookie->object_size);
+
+ old_tmpfile = test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags);
+
+ if (!object->file) {
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_ACTIVE);
+ _leave(" = t [light]");
+ return true;
+ }
+
+ new_file = cachefiles_create_tmpfile(object);
+ if (IS_ERR(new_file))
+ goto failed;
+
+ /* Substitute the VFS target */
+ _debug("sub");
+ spin_lock(&object->lock);
+
+ old_file = object->file;
+ object->file = new_file;
+ object->content_info = CACHEFILES_CONTENT_NO_DATA;
+ set_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags);
+ set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags);
+
+ spin_unlock(&object->lock);
+ _debug("subbed");
+
+ /* Allow I/O to take place again */
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_ACTIVE);
+
+ if (old_file) {
+ if (!old_tmpfile) {
+ struct cachefiles_volume *volume = object->volume;
+ struct dentry *fan = volume->fanout[(u8)object->key_hash];
+
+ inode_lock_nested(d_inode(fan), I_MUTEX_PARENT);
+ cachefiles_bury_object(volume->cache, object, fan,
+ old_file->f_path.dentry,
+ FSCACHE_OBJECT_INVALIDATED);
+ }
+ fput(old_file);
+ }
+
+ _leave(" = t");
+ return true;
+
+failed:
+ fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_FAILED);
+ _leave(" = f");
+ return false;
+}
+
const struct fscache_cache_ops cachefiles_cache_ops = {
.name = "cachefiles",
.acquire_volume = cachefiles_acquire_volume,
.free_volume = cachefiles_free_volume,
+ .lookup_cookie = cachefiles_lookup_cookie,
+ .withdraw_cookie = cachefiles_withdraw_cookie,
+ .invalidate_cookie = cachefiles_invalidate_cookie,
+ .resize_cookie = cachefiles_resize_cookie,
+ .prepare_to_write = cachefiles_prepare_to_write,
};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 828b888a8bf3..3fa23710fc6f 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -19,6 +19,8 @@
#include <linux/workqueue.h>
#include <linux/security.h>
+#define CACHEFILES_DIO_BLOCK_SIZE 4096
+
struct cachefiles_cache;
struct cachefiles_object;
@@ -27,6 +29,8 @@ extern unsigned cachefiles_debug;
#define CACHEFILES_DEBUG_KLEAVE 2
#define CACHEFILES_DEBUG_KDEBUG 4
+#define cachefiles_gfp (__GFP_RECLAIM | __GFP_NORETRY | __GFP_NOMEMALLOC)
+
enum cachefiles_content {
/* These values are saved on disk */
CACHEFILES_CONTENT_NO_DATA = 0, /* No content stored */
@@ -114,6 +118,18 @@ struct cachefiles_cache {
#include <trace/events/cachefiles.h>
+static inline
+struct file *cachefiles_cres_file(struct netfs_cache_resources *cres)
+{
+ return cres->cache_priv2;
+}
+
+static inline
+struct cachefiles_object *cachefiles_cres_object(struct netfs_cache_resources *cres)
+{
+ return fscache_cres_cookie(cres)->cache_priv;
+}
+
/*
* note change of state for daemon
*/
@@ -182,15 +198,45 @@ static inline int cachefiles_inject_remove_error(void)
* interface.c
*/
extern const struct fscache_cache_ops cachefiles_cache_ops;
+extern void cachefiles_see_object(struct cachefiles_object *object,
+ enum cachefiles_obj_ref_trace why);
+extern struct cachefiles_object *cachefiles_grab_object(struct cachefiles_object *object,
+ enum cachefiles_obj_ref_trace why);
+extern void cachefiles_put_object(struct cachefiles_object *object,
+ enum cachefiles_obj_ref_trace why);
extern void cachefiles_sync_cache(struct cachefiles_cache *cache);
+/*
+ * key.c
+ */
+extern bool cachefiles_cook_key(struct cachefiles_object *object);
+
/*
* namei.c
*/
+extern void cachefiles_unmark_inode_in_use(struct cachefiles_object *object,
+ struct file *file);
+extern int cachefiles_bury_object(struct cachefiles_cache *cache,
+ struct cachefiles_object *object,
+ struct dentry *dir,
+ struct dentry *rep,
+ enum fscache_why_object_killed why);
+extern int cachefiles_delete_object(struct cachefiles_object *object,
+ enum fscache_why_object_killed why);
+extern bool cachefiles_look_up_object(struct cachefiles_object *object);
extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
struct dentry *dir,
const char *name);
+extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
+ char *filename);
+
+extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
+ struct dentry *dir, char *filename);
+extern struct file *cachefiles_create_tmpfile(struct cachefiles_object *object);
+extern bool cachefiles_commit_tmpfile(struct cachefiles_cache *cache,
+ struct cachefiles_object *object);
+
/*
* security.c
*/
@@ -218,6 +264,17 @@ void cachefiles_acquire_volume(struct fscache_volume *volume);
void cachefiles_free_volume(struct fscache_volume *volume);
void cachefiles_withdraw_volume(struct cachefiles_volume *volume);
+/*
+ * xattr.c
+ */
+extern int cachefiles_set_object_xattr(struct cachefiles_object *object);
+extern int cachefiles_check_auxdata(struct cachefiles_object *object,
+ struct file *file);
+extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
+ struct cachefiles_object *object,
+ struct dentry *dentry);
+extern void cachefiles_prepare_to_write(struct fscache_cookie *cookie);
+
/*
* error handling
*/
diff --git a/fs/cachefiles/key.c b/fs/cachefiles/key.c
new file mode 100644
index 000000000000..10f2be29f892
--- /dev/null
+++ b/fs/cachefiles/key.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Key to pathname encoder
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/slab.h>
+#include "internal.h"
+
+static const char cachefiles_charmap[64] =
+ "0123456789" /* 0 - 9 */
+ "abcdefghijklmnopqrstuvwxyz" /* 10 - 35 */
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" /* 36 - 61 */
+ "_-" /* 62 - 63 */
+ ;
+
+static const char cachefiles_filecharmap[256] = {
+ /* we skip space and tab and control chars */
+ [33 ... 46] = 1, /* '!' -> '.' */
+ /* we skip '/' as it's significant to pathwalk */
+ [48 ... 127] = 1, /* '0' -> '~' */
+};
+
+static inline unsigned int how_many_hex_digits(unsigned int x)
+{
+ return x ? round_up(ilog2(x) + 1, 4) / 4 : 0;
+}
+
+/*
+ * turn the raw key into something cooked
+ * - the key may be up to NAME_MAX in length (including the length word)
+ * - "base64" encode the strange keys, mapping 3 bytes of raw to four of
+ * cooked
+ * - need to cut the cooked key into 252 char lengths (189 raw bytes)
+ */
+bool cachefiles_cook_key(struct cachefiles_object *object)
+{
+ const u8 *key = fscache_get_key(object->cookie), *kend;
+ unsigned char sum, ch;
+ unsigned int acc, i, n, nle, nbe, keylen = object->cookie->key_len;
+ unsigned int b64len, len, print, pad;
+ char *name, sep;
+
+ _enter(",%u,%*phN", keylen, keylen, key);
+
+ BUG_ON(keylen > NAME_MAX - 3);
+
+ sum = 0;
+ print = 1;
+ for (i = 0; i < keylen; i++) {
+ ch = key[i];
+ sum += ch;
+ print &= cachefiles_filecharmap[ch];
+ }
+ object->key_hash = sum;
+
+ /* If the path is usable ASCII, then we render it directly */
+ if (print) {
+ len = 1 + keylen + 1;
+ name = kmalloc(len, cachefiles_gfp);
+ if (!name)
+ return false;
+
+ name[0] = 'D'; /* Data object type, string encoding */
+ name[1 + keylen] = 0;
+ memcpy(name + 1, key, keylen);
+ goto success;
+ }
+
+ /* See if it makes sense to encode it as "hex,hex,hex" for each 32-bit
+ * chunk. We rely on the key having been padded out to a whole number
+ * of 32-bit words.
+ */
+ n = round_up(keylen, 4);
+ nbe = nle = 0;
+ for (i = 0; i < n; i += 4) {
+ u32 be = be32_to_cpu(*(__be32 *)(key + i));
+ u32 le = le32_to_cpu(*(__le32 *)(key + i));
+
+ nbe += 1 + how_many_hex_digits(be);
+ nle += 1 + how_many_hex_digits(le);
+ }
+
+ b64len = DIV_ROUND_UP(keylen, 3);
+ pad = b64len * 3 - keylen;
+ b64len = 2 + b64len * 4; /* Length if we base64-encode it */
+ _debug("len=%u nbe=%u nle=%u b64=%u", keylen, nbe, nle, b64len);
+ if (nbe < b64len || nle < b64len) {
+ unsigned int nlen = min(nbe, nle) + 1;
+ name = kmalloc(nlen, cachefiles_gfp);
+ if (!name)
+ return false;
+ sep = (nbe <= nle) ? 'S' : 'T'; /* Encoding indicator */
+ len = 0;
+ for (i = 0; i < n; i += 4) {
+ u32 x;
+ if (nbe <= nle)
+ x = be32_to_cpu(*(__be32 *)(key + i));
+ else
+ x = le32_to_cpu(*(__le32 *)(key + i));
+ name[len++] = sep;
+ if (x != 0)
+ len += snprintf(name + len, nlen - len, "%x", x);
+ sep = ',';
+ }
+ goto success;
+ }
+
+ /* We need to base64-encode it */
+ name = kmalloc(b64len + 1, cachefiles_gfp);
+ if (!name)
+ return false;
+
+ name[0] = 'E';
+ name[1] = '0' + pad;
+ len = 2;
+ kend = key + keylen;
+ do {
+ acc = *key++;
+ if (key < kend) {
+ acc |= *key++ << 8;
+ if (key < kend)
+ acc |= *key++ << 16;
+ }
+
+ name[len++] = cachefiles_charmap[acc & 63];
+ acc >>= 6;
+ name[len++] = cachefiles_charmap[acc & 63];
+ acc >>= 6;
+ name[len++] = cachefiles_charmap[acc & 63];
+ acc >>= 6;
+ name[len++] = cachefiles_charmap[acc & 63];
+ } while (key < kend);
+
+success:
+ name[len] = 0;
+ object->d_name = name;
+ object->d_name_len = len;
+ _leave(" = %s", object->d_name);
+ return true;
+}
diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c
index 22581099236b..7a459074d715 100644
--- a/fs/cachefiles/main.c
+++ b/fs/cachefiles/main.c
@@ -31,6 +31,8 @@ MODULE_DESCRIPTION("Mounted-filesystem based cache");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
+struct kmem_cache *cachefiles_object_jar;
+
static struct miscdevice cachefiles_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "cachefiles",
@@ -52,9 +54,22 @@ static int __init cachefiles_init(void)
if (ret < 0)
goto error_dev;
+ /* create an object jar */
+ ret = -ENOMEM;
+ cachefiles_object_jar =
+ kmem_cache_create("cachefiles_object_jar",
+ sizeof(struct cachefiles_object),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!cachefiles_object_jar) {
+ pr_notice("Failed to allocate an object jar\n");
+ goto error_object_jar;
+ }
+
pr_info("Loaded\n");
return 0;
+error_object_jar:
+ misc_deregister(&cachefiles_dev);
error_dev:
cachefiles_unregister_error_injection();
error_einj:
@@ -71,6 +86,7 @@ static void __exit cachefiles_exit(void)
{
pr_info("Unloading\n");
+ kmem_cache_destroy(cachefiles_object_jar);
misc_deregister(&cachefiles_dev);
cachefiles_unregister_error_injection();
}
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 69915dde0a83..ad87fb28b602 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -18,6 +18,431 @@
#include <linux/slab.h>
#include "internal.h"
+/*
+ * Mark the backing file as being a cache file if it's not already in use so.
+ */
+static bool cachefiles_mark_inode_in_use(struct cachefiles_object *object,
+ struct dentry *dentry)
+{
+ struct inode *inode = d_backing_inode(dentry);
+ bool can_use = false;
+
+ _enter(",%x", object->debug_id);
+
+ inode_lock(inode);
+
+ if (!(inode->i_flags & S_KERNEL_FILE)) {
+ inode->i_flags |= S_KERNEL_FILE;
+ trace_cachefiles_mark_active(object, inode);
+ can_use = true;
+ } else {
+ pr_notice("cachefiles: Inode already in use: %pD\n", object->file);
+ }
+
+ inode_unlock(inode);
+ return can_use;
+}
+
+/*
+ * Unmark a backing inode.
+ */
+void cachefiles_unmark_inode_in_use(struct cachefiles_object *object,
+ struct file *file)
+{
+ struct inode *inode = file_inode(file);
+
+ if (!inode)
+ return;
+
+ inode_lock(inode);
+ inode->i_flags &= ~S_KERNEL_FILE;
+ inode_unlock(inode);
+ trace_cachefiles_mark_inactive(object, inode);
+}
+
+/*
+ * Mark an object as being inactive.
+ */
+static void cachefiles_mark_object_inactive(struct cachefiles_object *object,
+ struct file *file)
+{
+ struct cachefiles_cache *cache = object->volume->cache;
+ blkcnt_t i_blocks = file_inode(file)->i_blocks;
+
+ /* This object can now be culled, so we need to let the daemon know
+ * that there is something it can remove if it needs to.
+ */
+ atomic_long_add(i_blocks, &cache->b_released);
+ if (atomic_inc_return(&cache->f_released))
+ cachefiles_state_changed(cache);
+}
+
+/*
+ * delete an object representation from the cache
+ * - file backed objects are unlinked
+ * - directory backed objects are stuffed into the graveyard for userspace to
+ * delete
+ */
+int cachefiles_bury_object(struct cachefiles_cache *cache,
+ struct cachefiles_object *object,
+ struct dentry *dir,
+ struct dentry *rep,
+ enum fscache_why_object_killed why)
+{
+ struct dentry *grave, *trap;
+ struct path path, path_to_graveyard;
+ char nbuffer[8 + 8 + 1];
+ int ret;
+
+ _enter(",'%pd','%pd'", dir, rep);
+
+ if (rep->d_parent != dir) {
+ inode_unlock(d_inode(dir));
+ _leave(" = -ESTALE");
+ return -ESTALE;
+ }
+
+ /* non-directories can just be unlinked */
+ if (!d_is_dir(rep)) {
+ _debug("unlink stale object");
+
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ ret = security_path_unlink(&path, rep);
+ if (ret < 0) {
+ cachefiles_io_error(cache, "Unlink security error");
+ } else {
+ trace_cachefiles_unlink(object, rep, why);
+ dget(rep); /* Stop the dentry being negated if it's
+ * only pinned by a file struct.
+ */
+ ret = cachefiles_inject_remove_error();
+ if (ret == 0)
+ ret = vfs_unlink(&init_user_ns, d_inode(dir), rep, NULL);
+ dput(rep);
+ }
+
+ inode_unlock(d_inode(dir));
+
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(object, d_inode(dir), ret,
+ cachefiles_trace_unlink_error);
+ if (ret == -EIO)
+ cachefiles_io_error(cache, "Unlink failed");
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+ }
+
+ /* directories have to be moved to the graveyard */
+ _debug("move stale object to graveyard");
+ inode_unlock(d_inode(dir));
+
+try_again:
+ /* first step is to make up a grave dentry in the graveyard */
+ sprintf(nbuffer, "%08x%08x",
+ (uint32_t) ktime_get_real_seconds(),
+ (uint32_t) atomic_inc_return(&cache->gravecounter));
+
+ /* do the multiway lock magic */
+ trap = lock_rename(cache->graveyard, dir);
+
+ /* do some checks before getting the grave dentry */
+ if (rep->d_parent != dir || IS_DEADDIR(d_inode(rep))) {
+ /* the entry was probably culled when we dropped the parent dir
+ * lock */
+ unlock_rename(cache->graveyard, dir);
+ _leave(" = 0 [culled?]");
+ return 0;
+ }
+
+ if (!d_can_lookup(cache->graveyard)) {
+ unlock_rename(cache->graveyard, dir);
+ cachefiles_io_error(cache, "Graveyard no longer a directory");
+ return -EIO;
+ }
+
+ if (trap == rep) {
+ unlock_rename(cache->graveyard, dir);
+ cachefiles_io_error(cache, "May not make directory loop");
+ return -EIO;
+ }
+
+ if (d_mountpoint(rep)) {
+ unlock_rename(cache->graveyard, dir);
+ cachefiles_io_error(cache, "Mountpoint in cache");
+ return -EIO;
+ }
+
+ grave = lookup_one_len(nbuffer, cache->graveyard, strlen(nbuffer));
+ if (IS_ERR(grave)) {
+ unlock_rename(cache->graveyard, dir);
+ trace_cachefiles_vfs_error(object, d_inode(cache->graveyard),
+ PTR_ERR(grave),
+ cachefiles_trace_lookup_error);
+
+ if (PTR_ERR(grave) == -ENOMEM) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ cachefiles_io_error(cache, "Lookup error %ld", PTR_ERR(grave));
+ return -EIO;
+ }
+
+ if (d_is_positive(grave)) {
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ grave = NULL;
+ cond_resched();
+ goto try_again;
+ }
+
+ if (d_mountpoint(grave)) {
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ cachefiles_io_error(cache, "Mountpoint in graveyard");
+ return -EIO;
+ }
+
+ /* target should not be an ancestor of source */
+ if (trap == grave) {
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ cachefiles_io_error(cache, "May not make directory loop");
+ return -EIO;
+ }
+
+ /* attempt the rename */
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ path_to_graveyard.mnt = cache->mnt;
+ path_to_graveyard.dentry = cache->graveyard;
+ ret = security_path_rename(&path, rep, &path_to_graveyard, grave, 0);
+ if (ret < 0) {
+ cachefiles_io_error(cache, "Rename security error %d", ret);
+ } else {
+ struct renamedata rd = {
+ .old_mnt_userns = &init_user_ns,
+ .old_dir = d_inode(dir),
+ .old_dentry = rep,
+ .new_mnt_userns = &init_user_ns,
+ .new_dir = d_inode(cache->graveyard),
+ .new_dentry = grave,
+ };
+ trace_cachefiles_rename(object, rep, grave, why);
+ ret = cachefiles_inject_read_error();
+ if (ret == 0)
+ ret = vfs_rename(&rd);
+ if (ret != 0)
+ trace_cachefiles_vfs_error(object, d_inode(dir),
+ PTR_ERR(grave),
+ cachefiles_trace_rename_error);
+ if (ret != 0 && ret != -ENOMEM)
+ cachefiles_io_error(cache,
+ "Rename failed with error %d", ret);
+ }
+
+ unlock_rename(cache->graveyard, dir);
+ dput(grave);
+ _leave(" = 0");
+ return 0;
+}
+
+static int cachefiles_unlink(struct cachefiles_object *object,
+ struct dentry *fan, struct dentry *dentry,
+ enum fscache_why_object_killed why)
+{
+ struct path path = {
+ .mnt = object->volume->cache->mnt,
+ .dentry = fan,
+ };
+ int ret;
+
+ trace_cachefiles_unlink(object, dentry, why);
+ ret = security_path_unlink(&path, dentry);
+ if (ret == 0)
+ ret = cachefiles_inject_remove_error();
+ if (ret == 0)
+ ret = vfs_unlink(&init_user_ns, d_backing_inode(fan), dentry, NULL);
+ if (ret != 0)
+ trace_cachefiles_vfs_error(object, d_backing_inode(fan), ret,
+ cachefiles_trace_unlink_error);
+ return ret;
+}
+
+/*
+ * Delete a cache file.
+ */
+int cachefiles_delete_object(struct cachefiles_object *object,
+ enum fscache_why_object_killed why)
+{
+ struct cachefiles_volume *volume = object->volume;
+ struct dentry *dentry = object->file->f_path.dentry;
+ struct dentry *fan = volume->fanout[(u8)object->key_hash];
+ int ret;
+
+ _enter(",OBJ%x{%pD}", object->debug_id, object->file);
+
+ /* Stop the dentry being negated if it's only pinned by a file struct. */
+ dget(dentry);
+
+ inode_lock_nested(d_backing_inode(fan), I_MUTEX_PARENT);
+ ret = cachefiles_unlink(object, fan, dentry, why);
+ inode_unlock(d_backing_inode(fan));
+ dput(dentry);
+
+ if (ret < 0)
+ trace_cachefiles_vfs_error(object, d_backing_inode(fan), ret,
+ cachefiles_trace_unlink_error);
+ if (ret < 0 && ret != -ENOENT)
+ cachefiles_io_error(volume->cache, "Unlink failed");
+ return ret;
+}
+
+/*
+ * Create a new file.
+ */
+static bool cachefiles_create_file(struct cachefiles_object *object)
+{
+ struct file *file;
+ int ret;
+
+ ret = cachefiles_has_space(object->volume->cache, 1, 0);
+ if (ret < 0)
+ return false;
+
+ file = cachefiles_create_tmpfile(object);
+ if (IS_ERR(file))
+ return false;
+
+ set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &object->cookie->flags);
+ set_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags);
+ _debug("create -> %pD{ino=%lu}", file, file_inode(file)->i_ino);
+ object->file = file;
+ return true;
+}
+
+/*
+ * Open an existing file, checking its attributes and replacing it if it is
+ * stale.
+ */
+static bool cachefiles_open_file(struct cachefiles_object *object,
+ struct dentry *dentry)
+{
+ struct cachefiles_cache *cache = object->volume->cache;
+ struct file *file;
+ struct path path;
+ int ret;
+
+ _enter("%pd", dentry);
+
+ if (!cachefiles_mark_inode_in_use(object, dentry))
+ return false;
+
+ /* We need to open a file interface onto a data file now as we can't do
+ * it on demand because writeback called from do_exit() sees
+ * current->fs == NULL - which breaks d_path() called from ext4 open.
+ */
+ path.mnt = cache->mnt;
+ path.dentry = dentry;
+ file = open_with_fake_path(&path, O_RDWR | O_LARGEFILE | O_DIRECT,
+ d_backing_inode(dentry), cache->cache_cred);
+ if (IS_ERR(file)) {
+ trace_cachefiles_vfs_error(object, d_backing_inode(dentry),
+ PTR_ERR(file),
+ cachefiles_trace_open_error);
+ goto error;
+ }
+
+ if (unlikely(!file->f_op->read_iter) ||
+ unlikely(!file->f_op->write_iter)) {
+ pr_notice("Cache does not support read_iter and write_iter\n");
+ goto error_fput;
+ }
+ _debug("file -> %pd positive", dentry);
+
+ ret = cachefiles_check_auxdata(object, file);
+ if (ret < 0)
+ goto check_failed;
+
+ object->file = file;
+
+ /* Always update the atime on an object we've just looked up (this is
+ * used to keep track of culling, and atimes are only updated by read,
+ * write and readdir but not lookup or open).
+ */
+ touch_atime(&file->f_path);
+ dput(dentry);
+ return true;
+
+check_failed:
+ fscache_cookie_lookup_negative(object->cookie);
+ cachefiles_unmark_inode_in_use(object, file);
+ cachefiles_mark_object_inactive(object, file);
+ if (ret == -ESTALE) {
+ fput(file);
+ dput(dentry);
+ return cachefiles_create_file(object);
+ }
+error_fput:
+ fput(file);
+error:
+ dput(dentry);
+ return false;
+}
+
+/*
+ * walk from the parent object to the child object through the backing
+ * filesystem, creating directories as we go
+ */
+bool cachefiles_look_up_object(struct cachefiles_object *object)
+{
+ struct cachefiles_volume *volume = object->volume;
+ struct dentry *dentry, *fan = volume->fanout[(u8)object->key_hash];
+ int ret;
+
+ _enter("OBJ%x,%s,", object->debug_id, object->d_name);
+
+ /* Look up path "cache/vol/fanout/file". */
+ ret = cachefiles_inject_read_error();
+ if (ret == 0)
+ dentry = lookup_positive_unlocked(object->d_name, fan,
+ object->d_name_len);
+ else
+ dentry = ERR_PTR(ret);
+ trace_cachefiles_lookup(object, dentry);
+ if (IS_ERR(dentry)) {
+ if (dentry == ERR_PTR(-ENOENT))
+ goto new_file;
+ if (dentry == ERR_PTR(-EIO))
+ cachefiles_io_error_obj(object, "Lookup failed");
+ return false;
+ }
+
+ if (!d_is_reg(dentry)) {
+ pr_err("%pd is not a file\n", dentry);
+ inode_lock_nested(d_inode(fan), I_MUTEX_PARENT);
+ ret = cachefiles_bury_object(volume->cache, object, fan, dentry,
+ FSCACHE_OBJECT_IS_WEIRD);
+ dput(dentry);
+ if (ret < 0)
+ return false;
+ goto new_file;
+ }
+
+ if (!cachefiles_open_file(object, dentry))
+ return false;
+
+ _leave(" = t [%lu]", file_inode(object->file)->i_ino);
+ return true;
+
+new_file:
+ fscache_cookie_lookup_negative(object->cookie);
+ return cachefiles_create_file(object);
+}
+
/*
* get a subdirectory
*/
@@ -131,3 +556,317 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
+
+/*
+ * find out if an object is in use or not
+ * - if finds object and it's not in use:
+ * - returns a pointer to the object and a reference on it
+ * - returns with the directory locked
+ */
+static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
+ struct dentry *dir,
+ char *filename)
+{
+ struct dentry *victim;
+ int ret;
+
+ //_enter(",%pd/,%s",
+ // dir, filename);
+
+ /* look up the victim */
+ inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
+
+ victim = lookup_one_len(filename, dir, strlen(filename));
+ if (IS_ERR(victim))
+ goto lookup_error;
+
+ //_debug("victim -> %pd %s",
+ // victim, d_backing_inode(victim) ? "positive" : "negative");
+
+ /* if the object is no longer there then we probably retired the object
+ * at the netfs's request whilst the cull was in progress
+ */
+ if (d_is_negative(victim)) {
+ inode_unlock(d_inode(dir));
+ dput(victim);
+ _leave(" = -ENOENT [absent]");
+ return ERR_PTR(-ENOENT);
+ }
+
+ //_leave(" = %pd", victim);
+ return victim;
+
+lookup_error:
+ inode_unlock(d_inode(dir));
+ ret = PTR_ERR(victim);
+ if (ret == -ENOENT) {
+ /* file or dir now absent - probably retired by netfs */
+ _leave(" = -ESTALE [absent]");
+ return ERR_PTR(-ESTALE);
+ }
+
+ if (ret == -EIO) {
+ cachefiles_io_error(cache, "Lookup failed");
+ } else if (ret != -ENOMEM) {
+ pr_err("Internal error: %d\n", ret);
+ ret = -EIO;
+ }
+
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+}
+
+/*
+ * cull an object if it's not in use
+ * - called only by cache manager daemon
+ */
+int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
+ char *filename)
+{
+ struct dentry *victim;
+ struct inode *inode;
+ int ret;
+
+ _enter(",%pd/,%s", dir, filename);
+
+ victim = cachefiles_check_active(cache, dir, filename);
+ if (IS_ERR(victim))
+ return PTR_ERR(victim);
+
+ /* check to see if someone is using this object */
+ inode = d_inode(victim);
+ inode_lock(inode);
+ if (inode->i_flags & S_KERNEL_FILE) {
+ ret = -EBUSY;
+ } else {
+ inode->i_flags |= S_KERNEL_FILE;
+ ret = 0;
+ }
+ inode_unlock(inode);
+ if (ret < 0)
+ goto error_unlock;
+
+ _debug("victim -> %pd %s",
+ victim, d_backing_inode(victim) ? "positive" : "negative");
+
+ /* okay... the victim is not being used so we can cull it
+ * - start by marking it as stale
+ */
+ _debug("victim is cullable");
+
+ ret = cachefiles_remove_object_xattr(cache, NULL, victim);
+ if (ret < 0)
+ goto error_unlock;
+
+ /* actually remove the victim (drops the dir mutex) */
+ _debug("bury");
+
+ ret = cachefiles_bury_object(cache, NULL, dir, victim,
+ FSCACHE_OBJECT_WAS_CULLED);
+ if (ret < 0)
+ goto error;
+
+ dput(victim);
+ _leave(" = 0");
+ return 0;
+
+error_unlock:
+ inode_unlock(d_inode(dir));
+error:
+ dput(victim);
+ if (ret == -ENOENT) {
+ /* file or dir now absent - probably retired by netfs */
+ _leave(" = -ESTALE [absent]");
+ return -ESTALE;
+ }
+
+ if (ret != -ENOMEM) {
+ pr_err("Internal error: %d\n", ret);
+ ret = -EIO;
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * find out if an object is in use or not
+ * - called only by cache manager daemon
+ * - returns -EBUSY or 0 to indicate whether an object is in use or not
+ */
+int cachefiles_check_in_use(struct cachefiles_cache *cache, struct dentry *dir,
+ char *filename)
+{
+ struct dentry *victim;
+ int ret = 0;
+
+ //_enter(",%pd/,%s",
+ // dir, filename);
+
+ victim = cachefiles_check_active(cache, dir, filename);
+ if (IS_ERR(victim))
+ return PTR_ERR(victim);
+
+ inode_unlock(d_inode(dir));
+ if (d_inode(victim)->i_flags & S_KERNEL_FILE)
+ ret = -EBUSY;
+ dput(victim);
+ //_leave(" = 0");
+ return ret;
+}
+
+/*
+ * Create a temporary file and leave it unattached and un-xattr'd until the
+ * time comes to discard the object from memory.
+ */
+struct file *cachefiles_create_tmpfile(struct cachefiles_object *object)
+{
+ struct cachefiles_volume *volume = object->volume;
+ struct cachefiles_cache *cache = volume->cache;
+ const struct cred *saved_cred;
+ struct dentry *fan = volume->fanout[(u8)object->key_hash];
+ struct file *file;
+ struct path path;
+ uint64_t ni_size = object->cookie->object_size;
+ long ret;
+
+ ni_size = round_up(ni_size, CACHEFILES_DIO_BLOCK_SIZE);
+
+ cachefiles_begin_secure(cache, &saved_cred);
+
+ path.mnt = cache->mnt;
+ ret = cachefiles_inject_write_error();
+ if (ret == 0)
+ path.dentry = vfs_tmpfile(&init_user_ns, fan, S_IFREG, O_RDWR);
+ else
+ path.dentry = ERR_PTR(ret);
+ if (IS_ERR(path.dentry)) {
+ trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(path.dentry),
+ cachefiles_trace_tmpfile_error);
+ if (PTR_ERR(path.dentry) == -EIO)
+ cachefiles_io_error_obj(object, "Failed to create tmpfile");
+ file = ERR_CAST(path.dentry);
+ goto out;
+ }
+
+ trace_cachefiles_tmpfile(object, d_backing_inode(path.dentry));
+
+ if (!cachefiles_mark_inode_in_use(object, path.dentry)) {
+ file = ERR_PTR(-EBUSY);
+ goto out_dput;
+ }
+
+ if (ni_size > 0) {
+ trace_cachefiles_trunc(object, d_backing_inode(path.dentry), 0, ni_size,
+ cachefiles_trunc_expand_tmpfile);
+ ret = cachefiles_inject_write_error();
+ if (ret == 0)
+ ret = vfs_truncate(&path, ni_size);
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(
+ object, d_backing_inode(path.dentry), ret,
+ cachefiles_trace_trunc_error);
+ file = ERR_PTR(ret);
+ goto out_dput;
+ }
+ }
+
+ file = open_with_fake_path(&path, O_RDWR | O_LARGEFILE | O_DIRECT,
+ d_backing_inode(path.dentry), cache->cache_cred);
+ if (IS_ERR(file)) {
+ trace_cachefiles_vfs_error(object, d_backing_inode(path.dentry),
+ PTR_ERR(file),
+ cachefiles_trace_open_error);
+ goto out_dput;
+ }
+ if (unlikely(!file->f_op->read_iter) ||
+ unlikely(!file->f_op->write_iter)) {
+ fput(file);
+ pr_notice("Cache does not support read_iter and write_iter\n");
+ file = ERR_PTR(-EINVAL);
+ }
+
+out_dput:
+ dput(path.dentry);
+out:
+ cachefiles_end_secure(cache, saved_cred);
+ return file;
+}
+
+/*
+ * Attempt to link a temporary file into its rightful place in the cache.
+ */
+bool cachefiles_commit_tmpfile(struct cachefiles_cache *cache,
+ struct cachefiles_object *object)
+{
+ struct cachefiles_volume *volume = object->volume;
+ struct dentry *dentry, *fan = volume->fanout[(u8)object->key_hash];
+ bool success = false;
+ int ret;
+
+ _enter(",%pD", object->file);
+
+ inode_lock_nested(d_inode(fan), I_MUTEX_PARENT);
+ ret = cachefiles_inject_read_error();
+ if (ret == 0)
+ dentry = lookup_one_len(object->d_name, fan, object->d_name_len);
+ else
+ dentry = ERR_PTR(ret);
+ if (IS_ERR(dentry)) {
+ trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(dentry),
+ cachefiles_trace_lookup_error);
+ _debug("lookup fail %ld", PTR_ERR(dentry));
+ goto out_unlock;
+ }
+
+ if (!d_is_negative(dentry)) {
+ if (d_backing_inode(dentry) == file_inode(object->file)) {
+ success = true;
+ goto out_dput;
+ }
+
+ ret = cachefiles_unlink(object, fan, dentry, FSCACHE_OBJECT_IS_STALE);
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(object, d_inode(fan), ret,
+ cachefiles_trace_unlink_error);
+ goto out_dput;
+ }
+
+ dput(dentry);
+ ret = cachefiles_inject_read_error();
+ if (ret == 0)
+ dentry = lookup_one_len(object->d_name, fan, object->d_name_len);
+ else
+ dentry = ERR_PTR(ret);
+ if (IS_ERR(dentry)) {
+ trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(dentry),
+ cachefiles_trace_lookup_error);
+ _debug("lookup fail %ld", PTR_ERR(dentry));
+ goto out_unlock;
+ }
+ }
+
+ ret = cachefiles_inject_read_error();
+ if (ret == 0)
+ ret = vfs_link(object->file->f_path.dentry, &init_user_ns,
+ d_inode(fan), dentry, NULL);
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(object, d_inode(fan), PTR_ERR(dentry),
+ cachefiles_trace_link_error);
+ _debug("link fail %d", ret);
+ } else {
+ trace_cachefiles_link(object, file_inode(object->file));
+ spin_lock(&object->lock);
+ /* TODO: Do we want to switch the file pointer to the new dentry? */
+ clear_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags);
+ spin_unlock(&object->lock);
+ success = true;
+ }
+
+out_dput:
+ dput(dentry);
+out_unlock:
+ inode_unlock(d_inode(fan));
+ _leave(" = %u", success);
+ return success;
+}
diff --git a/fs/cachefiles/xattr.c b/fs/cachefiles/xattr.c
new file mode 100644
index 000000000000..0601c46a22ef
--- /dev/null
+++ b/fs/cachefiles/xattr.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* CacheFiles extended attribute management
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/fsnotify.h>
+#include <linux/quotaops.h>
+#include <linux/xattr.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+#define CACHEFILES_COOKIE_TYPE_DATA 1
+
+struct cachefiles_xattr {
+ __be64 object_size; /* Actual size of the object */
+ __be64 zero_point; /* Size after which server has no data not written by us */
+ __u8 type; /* Type of object */
+ __u8 content; /* Content presence (enum cachefiles_content) */
+ __u8 data[]; /* netfs coherency data */
+} __packed;
+
+static const char cachefiles_xattr_cache[] =
+ XATTR_USER_PREFIX "CacheFiles.cache";
+
+/*
+ * set the state xattr on a cache file
+ */
+int cachefiles_set_object_xattr(struct cachefiles_object *object)
+{
+ struct cachefiles_xattr *buf;
+ struct dentry *dentry;
+ struct file *file = object->file;
+ unsigned int len = object->cookie->aux_len;
+ int ret;
+
+ if (!file)
+ return -ESTALE;
+ dentry = file->f_path.dentry;
+
+ _enter("%x,#%d", object->debug_id, len);
+
+ buf = kmalloc(sizeof(struct cachefiles_xattr) + len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ buf->object_size = cpu_to_be64(object->cookie->object_size);
+ buf->zero_point = 0;
+ buf->type = CACHEFILES_COOKIE_TYPE_DATA;
+ buf->content = object->content_info;
+ if (test_bit(FSCACHE_COOKIE_LOCAL_WRITE, &object->cookie->flags))
+ buf->content = CACHEFILES_CONTENT_DIRTY;
+ if (len > 0)
+ memcpy(buf->data, fscache_get_aux(object->cookie), len);
+
+ ret = cachefiles_inject_write_error();
+ if (ret == 0)
+ ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
+ buf, sizeof(struct cachefiles_xattr) + len, 0);
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(object, file_inode(file), ret,
+ cachefiles_trace_setxattr_error);
+ trace_cachefiles_coherency(object, file_inode(file)->i_ino,
+ buf->content,
+ cachefiles_coherency_set_fail);
+ if (ret != -ENOMEM)
+ cachefiles_io_error_obj(
+ object,
+ "Failed to set xattr with error %d", ret);
+ } else {
+ trace_cachefiles_coherency(object, file_inode(file)->i_ino,
+ buf->content,
+ cachefiles_coherency_set_ok);
+ }
+
+ kfree(buf);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * check the consistency between the backing cache and the FS-Cache cookie
+ */
+int cachefiles_check_auxdata(struct cachefiles_object *object, struct file *file)
+{
+ struct cachefiles_xattr *buf;
+ struct dentry *dentry = file->f_path.dentry;
+ unsigned int len = object->cookie->aux_len, tlen;
+ const void *p = fscache_get_aux(object->cookie);
+ enum cachefiles_coherency_trace why;
+ ssize_t xlen;
+ int ret = -ESTALE;
+
+ tlen = sizeof(struct cachefiles_xattr) + len;
+ buf = kmalloc(tlen, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ xlen = cachefiles_inject_read_error();
+ if (xlen == 0)
+ xlen = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache, buf, tlen);
+ if (xlen != tlen) {
+ if (xlen < 0)
+ trace_cachefiles_vfs_error(object, file_inode(file), xlen,
+ cachefiles_trace_getxattr_error);
+ if (xlen == -EIO)
+ cachefiles_io_error_obj(
+ object,
+ "Failed to read aux with error %zd", xlen);
+ why = cachefiles_coherency_check_xattr;
+ } else if (buf->type != CACHEFILES_COOKIE_TYPE_DATA) {
+ why = cachefiles_coherency_check_type;
+ } else if (memcmp(buf->data, p, len) != 0) {
+ why = cachefiles_coherency_check_aux;
+ } else if (be64_to_cpu(buf->object_size) != object->cookie->object_size) {
+ why = cachefiles_coherency_check_objsize;
+ } else if (buf->content == CACHEFILES_CONTENT_DIRTY) {
+ // TODO: Begin conflict resolution
+ pr_warn("Dirty object in cache\n");
+ why = cachefiles_coherency_check_dirty;
+ } else {
+ why = cachefiles_coherency_check_ok;
+ ret = 0;
+ }
+
+ trace_cachefiles_coherency(object, file_inode(file)->i_ino,
+ buf->content, why);
+ kfree(buf);
+ return ret;
+}
+
+/*
+ * remove the object's xattr to mark it stale
+ */
+int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
+ struct cachefiles_object *object,
+ struct dentry *dentry)
+{
+ int ret;
+
+ ret = cachefiles_inject_remove_error();
+ if (ret == 0)
+ ret = vfs_removexattr(&init_user_ns, dentry, cachefiles_xattr_cache);
+ if (ret < 0) {
+ trace_cachefiles_vfs_error(object, d_inode(dentry), ret,
+ cachefiles_trace_remxattr_error);
+ if (ret == -ENOENT || ret == -ENODATA)
+ ret = 0;
+ else if (ret != -ENOMEM)
+ cachefiles_io_error(cache,
+ "Can't remove xattr from %lu"
+ " (error %d)",
+ d_backing_inode(dentry)->i_ino, -ret);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Stick a marker on the cache object to indicate that it's dirty.
+ */
+void cachefiles_prepare_to_write(struct fscache_cookie *cookie)
+{
+ const struct cred *saved_cred;
+ struct cachefiles_object *object = cookie->cache_priv;
+ struct cachefiles_cache *cache = object->volume->cache;
+
+ _enter("c=%08x", object->cookie->debug_id);
+
+ if (!test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags)) {
+ cachefiles_begin_secure(cache, &saved_cred);
+ cachefiles_set_object_xattr(object);
+ cachefiles_end_secure(cache, saved_cred);
+ }
+}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 908ea452a2cf..336739fed3e9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2250,6 +2250,7 @@ struct super_operations {
#define S_ENCRYPTED (1 << 14) /* Encrypted file (using fs/crypto/) */
#define S_CASEFOLD (1 << 15) /* Casefolded file */
#define S_VERITY (1 << 16) /* Verity file (using fs/verity/) */
+#define S_KERNEL_FILE (1 << 17) /* File is in use by the kernel (eg. fs/cachefiles) */
/*
* Note that nosuid etc flags are inode-specific: setting some file-system
diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h
index 9bd5a8a60801..5412991ab5e1 100644
--- a/include/trace/events/cachefiles.h
+++ b/include/trace/events/cachefiles.h
@@ -18,6 +18,60 @@
#ifndef __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
#define __CACHEFILES_DECLARE_TRACE_ENUMS_ONCE_ONLY
+enum cachefiles_obj_ref_trace {
+ cachefiles_obj_get_ioreq,
+ cachefiles_obj_new,
+ cachefiles_obj_put_alloc_fail,
+ cachefiles_obj_put_detach,
+ cachefiles_obj_put_ioreq,
+ cachefiles_obj_see_clean_commit,
+ cachefiles_obj_see_clean_delete,
+ cachefiles_obj_see_clean_drop_tmp,
+ cachefiles_obj_see_lookup_cookie,
+ cachefiles_obj_see_lookup_failed,
+ cachefiles_obj_see_withdraw_cookie,
+ cachefiles_obj_see_withdrawal,
+};
+
+enum fscache_why_object_killed {
+ FSCACHE_OBJECT_IS_STALE,
+ FSCACHE_OBJECT_IS_WEIRD,
+ FSCACHE_OBJECT_INVALIDATED,
+ FSCACHE_OBJECT_NO_SPACE,
+ FSCACHE_OBJECT_WAS_RETIRED,
+ FSCACHE_OBJECT_WAS_CULLED,
+};
+
+enum cachefiles_coherency_trace {
+ cachefiles_coherency_check_aux,
+ cachefiles_coherency_check_content,
+ cachefiles_coherency_check_dirty,
+ cachefiles_coherency_check_len,
+ cachefiles_coherency_check_objsize,
+ cachefiles_coherency_check_ok,
+ cachefiles_coherency_check_type,
+ cachefiles_coherency_check_xattr,
+ cachefiles_coherency_set_fail,
+ cachefiles_coherency_set_ok,
+};
+
+enum cachefiles_trunc_trace {
+ cachefiles_trunc_dio_adjust,
+ cachefiles_trunc_expand_tmpfile,
+ cachefiles_trunc_shrink,
+};
+
+enum cachefiles_prepare_read_trace {
+ cachefiles_trace_read_after_eof,
+ cachefiles_trace_read_found_hole,
+ cachefiles_trace_read_found_part,
+ cachefiles_trace_read_have_data,
+ cachefiles_trace_read_no_data,
+ cachefiles_trace_read_no_file,
+ cachefiles_trace_read_seek_error,
+ cachefiles_trace_read_seek_nxio,
+};
+
enum cachefiles_error_trace {
cachefiles_trace_fallocate_error,
cachefiles_trace_getxattr_error,
@@ -43,6 +97,55 @@ enum cachefiles_error_trace {
/*
* Define enum -> string mappings for display.
*/
+#define cachefiles_obj_kill_traces \
+ EM(FSCACHE_OBJECT_IS_STALE, "stale") \
+ EM(FSCACHE_OBJECT_IS_WEIRD, "weird") \
+ EM(FSCACHE_OBJECT_INVALIDATED, "inval") \
+ EM(FSCACHE_OBJECT_NO_SPACE, "no_space") \
+ EM(FSCACHE_OBJECT_WAS_RETIRED, "was_retired") \
+ E_(FSCACHE_OBJECT_WAS_CULLED, "was_culled")
+
+#define cachefiles_obj_ref_traces \
+ EM(cachefiles_obj_get_ioreq, "GET ioreq") \
+ EM(cachefiles_obj_new, "NEW obj") \
+ EM(cachefiles_obj_put_alloc_fail, "PUT alloc_fail") \
+ EM(cachefiles_obj_put_detach, "PUT detach") \
+ EM(cachefiles_obj_put_ioreq, "PUT ioreq") \
+ EM(cachefiles_obj_see_clean_commit, "SEE clean_commit") \
+ EM(cachefiles_obj_see_clean_delete, "SEE clean_delete") \
+ EM(cachefiles_obj_see_clean_drop_tmp, "SEE clean_drop_tmp") \
+ EM(cachefiles_obj_see_lookup_cookie, "SEE lookup_cookie") \
+ EM(cachefiles_obj_see_lookup_failed, "SEE lookup_failed") \
+ EM(cachefiles_obj_see_withdraw_cookie, "SEE withdraw_cookie") \
+ E_(cachefiles_obj_see_withdrawal, "SEE withdrawal")
+
+#define cachefiles_coherency_traces \
+ EM(cachefiles_coherency_check_aux, "BAD aux ") \
+ EM(cachefiles_coherency_check_content, "BAD cont") \
+ EM(cachefiles_coherency_check_dirty, "BAD dirt") \
+ EM(cachefiles_coherency_check_len, "BAD len ") \
+ EM(cachefiles_coherency_check_objsize, "BAD osiz") \
+ EM(cachefiles_coherency_check_ok, "OK ") \
+ EM(cachefiles_coherency_check_type, "BAD type") \
+ EM(cachefiles_coherency_check_xattr, "BAD xatt") \
+ EM(cachefiles_coherency_set_fail, "SET fail") \
+ E_(cachefiles_coherency_set_ok, "SET ok ")
+
+#define cachefiles_trunc_traces \
+ EM(cachefiles_trunc_dio_adjust, "DIOADJ") \
+ EM(cachefiles_trunc_expand_tmpfile, "EXPTMP") \
+ E_(cachefiles_trunc_shrink, "SHRINK")
+
+#define cachefiles_prepare_read_traces \
+ EM(cachefiles_trace_read_after_eof, "after-eof ") \
+ EM(cachefiles_trace_read_found_hole, "found-hole") \
+ EM(cachefiles_trace_read_found_part, "found-part") \
+ EM(cachefiles_trace_read_have_data, "have-data ") \
+ EM(cachefiles_trace_read_no_data, "no-data ") \
+ EM(cachefiles_trace_read_no_file, "no-file ") \
+ EM(cachefiles_trace_read_seek_error, "seek-error") \
+ E_(cachefiles_trace_read_seek_nxio, "seek-enxio")
+
#define cachefiles_error_traces \
EM(cachefiles_trace_fallocate_error, "fallocate") \
EM(cachefiles_trace_getxattr_error, "getxattr") \
@@ -71,6 +174,11 @@ enum cachefiles_error_trace {
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define E_(a, b) TRACE_DEFINE_ENUM(a);
+cachefiles_obj_kill_traces;
+cachefiles_obj_ref_traces;
+cachefiles_coherency_traces;
+cachefiles_trunc_traces;
+cachefiles_prepare_read_traces;
cachefiles_error_traces;
/*
@@ -83,6 +191,252 @@ cachefiles_error_traces;
#define E_(a, b) { a, b }
+TRACE_EVENT(cachefiles_ref,
+ TP_PROTO(unsigned int object_debug_id,
+ unsigned int cookie_debug_id,
+ int usage,
+ enum cachefiles_obj_ref_trace why),
+
+ TP_ARGS(object_debug_id, cookie_debug_id, usage, why),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, cookie )
+ __field(enum cachefiles_obj_ref_trace, why )
+ __field(int, usage )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = object_debug_id;
+ __entry->cookie = cookie_debug_id;
+ __entry->usage = usage;
+ __entry->why = why;
+ ),
+
+ TP_printk("c=%08x o=%08x u=%d %s",
+ __entry->cookie, __entry->obj, __entry->usage,
+ __print_symbolic(__entry->why, cachefiles_obj_ref_traces))
+ );
+
+TRACE_EVENT(cachefiles_lookup,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de),
+
+ TP_ARGS(obj, de),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(short, error )
+ __field(unsigned long, ino )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->ino = (!IS_ERR(de) && d_backing_inode(de) ?
+ d_backing_inode(de)->i_ino : 0);
+ __entry->error = IS_ERR(de) ? PTR_ERR(de) : 0;
+ ),
+
+ TP_printk("o=%08x i=%lx e=%d",
+ __entry->obj, __entry->ino, __entry->error)
+ );
+
+TRACE_EVENT(cachefiles_tmpfile,
+ TP_PROTO(struct cachefiles_object *obj, struct inode *backer),
+
+ TP_ARGS(obj, backer),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, backer )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->backer = backer->i_ino;
+ ),
+
+ TP_printk("o=%08x b=%08x",
+ __entry->obj,
+ __entry->backer)
+ );
+
+TRACE_EVENT(cachefiles_link,
+ TP_PROTO(struct cachefiles_object *obj, struct inode *backer),
+
+ TP_ARGS(obj, backer),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, backer )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->backer = backer->i_ino;
+ ),
+
+ TP_printk("o=%08x b=%08x",
+ __entry->obj,
+ __entry->backer)
+ );
+
+TRACE_EVENT(cachefiles_unlink,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ enum fscache_why_object_killed why),
+
+ TP_ARGS(obj, de, why),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(enum fscache_why_object_killed, why )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj ? obj->debug_id : UINT_MAX;
+ __entry->de = de;
+ __entry->why = why;
+ ),
+
+ TP_printk("o=%08x d=%p w=%s",
+ __entry->obj, __entry->de,
+ __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
+ );
+
+TRACE_EVENT(cachefiles_rename,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct dentry *de,
+ struct dentry *to,
+ enum fscache_why_object_killed why),
+
+ TP_ARGS(obj, de, to, why),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(struct dentry *, de )
+ __field(struct dentry *, to )
+ __field(enum fscache_why_object_killed, why )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj ? obj->debug_id : UINT_MAX;
+ __entry->de = de;
+ __entry->to = to;
+ __entry->why = why;
+ ),
+
+ TP_printk("o=%08x d=%p t=%p w=%s",
+ __entry->obj, __entry->de, __entry->to,
+ __print_symbolic(__entry->why, cachefiles_obj_kill_traces))
+ );
+
+TRACE_EVENT(cachefiles_mark_active,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct inode *inode),
+
+ TP_ARGS(obj, inode),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(ino_t, inode )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->inode = inode->i_ino;
+ ),
+
+ TP_printk("o=%08x i=%lx",
+ __entry->obj, __entry->inode)
+ );
+
+TRACE_EVENT(cachefiles_mark_inactive,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct inode *inode),
+
+ TP_ARGS(obj, inode),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(ino_t, inode )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->inode = inode->i_ino;
+ ),
+
+ TP_printk("o=%08x i=%lx",
+ __entry->obj, __entry->inode)
+ );
+
+TRACE_EVENT(cachefiles_coherency,
+ TP_PROTO(struct cachefiles_object *obj,
+ ino_t ino,
+ enum cachefiles_content content,
+ enum cachefiles_coherency_trace why),
+
+ TP_ARGS(obj, ino, content, why),
+
+ /* Note that obj may be NULL */
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(enum cachefiles_coherency_trace, why )
+ __field(enum cachefiles_content, content )
+ __field(u64, ino )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->why = why;
+ __entry->content = content;
+ __entry->ino = ino;
+ ),
+
+ TP_printk("o=%08x %s i=%llx c=%u",
+ __entry->obj,
+ __print_symbolic(__entry->why, cachefiles_coherency_traces),
+ __entry->ino,
+ __entry->content)
+ );
+
+TRACE_EVENT(cachefiles_trunc,
+ TP_PROTO(struct cachefiles_object *obj, struct inode *backer,
+ loff_t from, loff_t to, enum cachefiles_trunc_trace why),
+
+ TP_ARGS(obj, backer, from, to, why),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, backer )
+ __field(enum cachefiles_trunc_trace, why )
+ __field(loff_t, from )
+ __field(loff_t, to )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->backer = backer->i_ino;
+ __entry->from = from;
+ __entry->to = to;
+ __entry->why = why;
+ ),
+
+ TP_printk("o=%08x b=%08x %s l=%llx->%llx",
+ __entry->obj,
+ __entry->backer,
+ __print_symbolic(__entry->why, cachefiles_trunc_traces),
+ __entry->from,
+ __entry->to)
+ );
+
TRACE_EVENT(cachefiles_vfs_error,
TP_PROTO(struct cachefiles_object *obj, struct inode *backer,
int error, enum cachefiles_error_trace where),
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index b01784370963..3ebb874b5f0f 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -48,6 +48,7 @@ enum fscache_volume_trace {
enum fscache_cookie_trace {
fscache_cookie_collision,
fscache_cookie_discard,
+ fscache_cookie_get_attach_object,
fscache_cookie_get_end_access,
fscache_cookie_get_hash_collision,
fscache_cookie_get_inval_work,
@@ -56,6 +57,7 @@ enum fscache_cookie_trace {
fscache_cookie_new_acquire,
fscache_cookie_put_hash_collision,
fscache_cookie_put_lru,
+ fscache_cookie_put_object,
fscache_cookie_put_over_queued,
fscache_cookie_put_relinquish,
fscache_cookie_put_withdrawn,
@@ -119,6 +121,7 @@ enum fscache_access_trace {
#define fscache_cookie_traces \
EM(fscache_cookie_collision, "*COLLIDE*") \
EM(fscache_cookie_discard, "DISCARD ") \
+ EM(fscache_cookie_get_attach_object, "GET attch") \
EM(fscache_cookie_get_hash_collision, "GET hcoll") \
EM(fscache_cookie_get_end_access, "GQ endac") \
EM(fscache_cookie_get_inval_work, "GQ inval") \
@@ -127,6 +130,7 @@ enum fscache_access_trace {
EM(fscache_cookie_new_acquire, "NEW acq ") \
EM(fscache_cookie_put_hash_collision, "PUT hcoll") \
EM(fscache_cookie_put_lru, "PUT lru ") \
+ EM(fscache_cookie_put_object, "PUT obj ") \
EM(fscache_cookie_put_over_queued, "PQ overq") \
EM(fscache_cookie_put_relinquish, "PUT relnq") \
EM(fscache_cookie_put_withdrawn, "PUT wthdn") \
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 39/53] cachefiles: Implement begin and end I/O
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (37 preceding siblings ...)
2021-10-22 19:07 ` [PATCH v2 38/53] cachefiles: Implement data storage object handling David Howells
@ 2021-10-22 19:07 ` David Howells
2021-10-22 19:08 ` [PATCH v2 40/53] cachefiles: Implement the I/O routines David Howells
` (15 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:07 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement the routines for beginning and ending an I/O operation.
When beginning an I/O operation, we are guaranteed that the cookie has
reached a certain stage (we're called by fscache after it has done a
suitable wait).
If a file is available, we paste a ref over into the cache resources for
the I/O routines to use. This means that the object can be invalidated
whilst the I/O is ongoing without needing to synchronise as the file
pointer in the object is replaced, but the file pointer in the cache
resources is unaffected.
Ending the operation just requires ditching any refs we have and dropping
the access guarantee that fscache got for us on the cookie.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/Makefile | 1 +
fs/cachefiles/interface.c | 1 +
fs/cachefiles/internal.h | 6 ++++
fs/cachefiles/io.c | 57 ++++++++++++++++++++++++++++++++++++++++
include/trace/events/fscache.h | 2 +
5 files changed, 67 insertions(+)
create mode 100644 fs/cachefiles/io.c
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index 5dd99ca8df05..c0df4c42cb09 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -7,6 +7,7 @@ cachefiles-y := \
bind.o \
daemon.o \
interface.o \
+ io.o \
key.o \
main.o \
namei.o \
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index b4a0bd2e803f..cfbae3ab66db 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -478,5 +478,6 @@ const struct fscache_cache_ops cachefiles_cache_ops = {
.withdraw_cookie = cachefiles_withdraw_cookie,
.invalidate_cookie = cachefiles_invalidate_cookie,
.resize_cookie = cachefiles_resize_cookie,
+ .begin_operation = cachefiles_begin_operation,
.prepare_to_write = cachefiles_prepare_to_write,
};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 3fa23710fc6f..d3c7db3b058e 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -206,6 +206,12 @@ extern void cachefiles_put_object(struct cachefiles_object *object,
enum cachefiles_obj_ref_trace why);
extern void cachefiles_sync_cache(struct cachefiles_cache *cache);
+/*
+ * io.c
+ */
+extern bool cachefiles_begin_operation(struct netfs_cache_resources *cres,
+ enum fscache_want_stage want_stage);
+
/*
* key.c
*/
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
new file mode 100644
index 000000000000..3839d0905a92
--- /dev/null
+++ b/fs/cachefiles/io.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* kiocb-using read/write
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/uio.h>
+#include <linux/falloc.h>
+#include <linux/sched/mm.h>
+#include <trace/events/fscache.h>
+#include "internal.h"
+
+/*
+ * Clean up an operation.
+ */
+static void cachefiles_end_operation(struct netfs_cache_resources *cres)
+{
+ struct file *file = cachefiles_cres_file(cres);
+
+ if (file)
+ fput(file);
+ fscache_end_cookie_access(fscache_cres_cookie(cres), fscache_access_io_end);
+}
+
+static const struct netfs_cache_ops cachefiles_netfs_cache_ops = {
+ .end_operation = cachefiles_end_operation,
+};
+
+/*
+ * Open the cache file when beginning a cache operation.
+ */
+bool cachefiles_begin_operation(struct netfs_cache_resources *cres,
+ enum fscache_want_stage want_stage)
+{
+ struct cachefiles_object *object = cachefiles_cres_object(cres);
+
+ if (!cachefiles_cres_file(cres)) {
+ cres->ops = &cachefiles_netfs_cache_ops;
+ if (object->file) {
+ spin_lock(&object->lock);
+ if (!cres->cache_priv2 && object->file)
+ cres->cache_priv2 = get_file(object->file);
+ spin_unlock(&object->lock);
+ }
+ }
+
+ if (!cachefiles_cres_file(cres) && want_stage != FSCACHE_WANT_PARAMS) {
+ pr_err("failed to get cres->file\n");
+ return false;
+ }
+
+ return true;
+}
diff --git a/include/trace/events/fscache.h b/include/trace/events/fscache.h
index 3ebb874b5f0f..86bf79bd3df8 100644
--- a/include/trace/events/fscache.h
+++ b/include/trace/events/fscache.h
@@ -77,6 +77,7 @@ enum fscache_access_trace {
fscache_access_cache_unpin,
fscache_access_invalidate_cookie,
fscache_access_invalidate_cookie_end,
+ fscache_access_io_end,
fscache_access_io_not_live,
fscache_access_io_read,
fscache_access_io_resize,
@@ -149,6 +150,7 @@ enum fscache_access_trace {
EM(fscache_access_cache_unpin, "UNPIN cache ") \
EM(fscache_access_invalidate_cookie, "BEGIN inval ") \
EM(fscache_access_invalidate_cookie_end,"END inval ") \
+ EM(fscache_access_io_end, "END io ") \
EM(fscache_access_io_not_live, "END io_notl") \
EM(fscache_access_io_read, "BEGIN io_read") \
EM(fscache_access_io_resize, "BEGIN io_resz") \
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 40/53] cachefiles: Implement the I/O routines
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (38 preceding siblings ...)
2021-10-22 19:07 ` [PATCH v2 39/53] cachefiles: Implement begin and end I/O David Howells
@ 2021-10-22 19:08 ` David Howells
2021-10-22 19:08 ` [PATCH v2 41/53] afs: Handle len being extending over page end in write_begin/write_end David Howells
` (14 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:08 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Implement the I/O routines for cachefiles. There are two sets of routines
here: preparation and actual I/O.
Preparation for read involves looking to see whether there is data present,
and how much. Netfslib tells us what it wants us to do and we have the
option of adjusting shrinking and telling it whether to read from the
cache, download from the server or simply clear a region.
Preparation for write involves checking for space and defending against
possibly running short of space, if necessary punching out a hole in the
file so that we don't leave old data in the cache if we update the
coherency information.
Preparation for write from the fallback API doesn't do that. It only
writes single pages and is not expected to write locally-modified data at
this time.
Then there's a read routine and a write routine. They wait for the cookie
state to move to something appropriate and then start a potentially
asynchronous direct I/O operation upon it.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/io.c | 522 +++++++++++++++++++++++++++++++++++++
include/trace/events/cachefiles.h | 99 +++++++
2 files changed, 621 insertions(+)
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 3839d0905a92..78e6ef781f73 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -14,6 +14,523 @@
#include <trace/events/fscache.h>
#include "internal.h"
+struct cachefiles_kiocb {
+ struct kiocb iocb;
+ refcount_t ki_refcnt;
+ loff_t start;
+ union {
+ size_t skipped;
+ size_t len;
+ };
+ struct cachefiles_object *object;
+ netfs_io_terminated_t term_func;
+ void *term_func_priv;
+ bool was_async;
+ unsigned int inval_counter; /* Copy of cookie->inval_counter */
+};
+
+static inline void cachefiles_put_kiocb(struct cachefiles_kiocb *ki)
+{
+ if (refcount_dec_and_test(&ki->ki_refcnt)) {
+ cachefiles_put_object(ki->object, cachefiles_obj_put_ioreq);
+ fput(ki->iocb.ki_filp);
+ kfree(ki);
+ }
+}
+
+/*
+ * Handle completion of a read from the cache.
+ */
+static void cachefiles_read_complete(struct kiocb *iocb, long ret, long ret2)
+{
+ struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb);
+ struct inode *inode = file_inode(ki->iocb.ki_filp);
+
+ _enter("%ld,%ld", ret, ret2);
+
+ if (ret < 0)
+ trace_cachefiles_io_error(ki->object, inode, ret,
+ cachefiles_trace_read_error);
+
+ if (ki->term_func) {
+ if (ret >= 0) {
+ if (ki->object->cookie->inval_counter == ki->inval_counter)
+ ki->skipped += ret;
+ else
+ ret = -ESTALE;
+ }
+
+ ki->term_func(ki->term_func_priv, ret, ki->was_async);
+ }
+
+ cachefiles_put_kiocb(ki);
+}
+
+/*
+ * Initiate a read from the cache.
+ */
+static int cachefiles_read(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ enum netfs_read_from_hole read_hole,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_kiocb *ki;
+ struct file *file;
+ unsigned int old_nofs;
+ ssize_t ret = -ENOBUFS;
+ size_t len = iov_iter_count(iter), skipped = 0;
+
+ if (!fscache_wait_for_operation(cres, FSCACHE_WANT_READ))
+ goto presubmission_error;
+
+ fscache_count_read();
+ object = cachefiles_cres_object(cres);
+ file = cachefiles_cres_file(cres);
+
+ _enter("%pD,%li,%llx,%zx/%llx",
+ file, file_inode(file)->i_ino, start_pos, len,
+ i_size_read(file_inode(file)));
+
+ /* If the caller asked us to seek for data before doing the read, then
+ * we should do that now. If we find a gap, we fill it with zeros.
+ */
+ if (read_hole != NETFS_READ_HOLE_IGNORE) {
+ loff_t off = start_pos, off2;
+
+ off2 = cachefiles_inject_read_error();
+ if (off2 == 0)
+ off2 = vfs_llseek(file, off, SEEK_DATA);
+ if (off2 < 0 && off2 >= (loff_t)-MAX_ERRNO && off2 != -ENXIO) {
+ skipped = 0;
+ ret = off2;
+ goto presubmission_error;
+ }
+
+ if (off2 == -ENXIO || off2 >= start_pos + len) {
+ /* The region is beyond the EOF or there's no more data
+ * in the region, so clear the rest of the buffer and
+ * return success.
+ */
+ ret = -ENODATA;
+ if (read_hole == NETFS_READ_HOLE_FAIL)
+ goto presubmission_error;
+
+ iov_iter_zero(len, iter);
+ skipped = len;
+ ret = 0;
+ goto presubmission_error;
+ }
+
+ skipped = off2 - off;
+ iov_iter_zero(skipped, iter);
+ }
+
+ ret = -ENOMEM;
+ ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
+ if (!ki)
+ goto presubmission_error;
+
+ refcount_set(&ki->ki_refcnt, 2);
+ ki->iocb.ki_filp = file;
+ ki->iocb.ki_pos = start_pos + skipped;
+ ki->iocb.ki_flags = IOCB_DIRECT;
+ ki->iocb.ki_hint = ki_hint_validate(file_write_hint(file));
+ ki->iocb.ki_ioprio = get_current_ioprio();
+ ki->skipped = skipped;
+ ki->object = object;
+ ki->inval_counter = cres->inval_counter;
+ ki->term_func = term_func;
+ ki->term_func_priv = term_func_priv;
+ ki->was_async = true;
+
+ if (ki->term_func)
+ ki->iocb.ki_complete = cachefiles_read_complete;
+
+ get_file(ki->iocb.ki_filp);
+ cachefiles_grab_object(object, cachefiles_obj_get_ioreq);
+
+ trace_cachefiles_read(object, file_inode(file), ki->iocb.ki_pos, len - skipped);
+ old_nofs = memalloc_nofs_save();
+ ret = cachefiles_inject_read_error();
+ if (ret == 0)
+ ret = vfs_iocb_iter_read(file, &ki->iocb, iter);
+ memalloc_nofs_restore(old_nofs);
+ switch (ret) {
+ case -EIOCBQUEUED:
+ goto in_progress;
+
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ case -ERESTARTNOHAND:
+ case -ERESTART_RESTARTBLOCK:
+ /* There's no easy way to restart the syscall since other AIO's
+ * may be already running. Just fail this IO with EINTR.
+ */
+ ret = -EINTR;
+ fallthrough;
+ default:
+ ki->was_async = false;
+ cachefiles_read_complete(&ki->iocb, ret, 0);
+ if (ret > 0)
+ ret = 0;
+ break;
+ }
+
+in_progress:
+ cachefiles_put_kiocb(ki);
+ _leave(" = %zd", ret);
+ return ret;
+
+presubmission_error:
+ if (term_func)
+ term_func(term_func_priv, ret < 0 ? ret : skipped, false);
+ return ret;
+}
+
+/*
+ * Handle completion of a write to the cache.
+ */
+static void cachefiles_write_complete(struct kiocb *iocb, long ret, long ret2)
+{
+ struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb);
+ struct inode *inode = file_inode(ki->iocb.ki_filp);
+
+ _enter("%ld,%ld", ret, ret2);
+
+ /* Tell lockdep we inherited freeze protection from submission thread */
+ __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
+ __sb_end_write(inode->i_sb, SB_FREEZE_WRITE);
+
+ if (ret < 0)
+ trace_cachefiles_io_error(ki->object, inode, ret,
+ cachefiles_trace_write_error);
+
+ set_bit(FSCACHE_COOKIE_HAVE_DATA, &ki->object->cookie->flags);
+ if (ki->term_func)
+ ki->term_func(ki->term_func_priv, ret, ki->was_async);
+ cachefiles_put_kiocb(ki);
+}
+
+/*
+ * Initiate a write to the cache.
+ */
+static int cachefiles_write(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_kiocb *ki;
+ struct inode *inode;
+ struct file *file;
+ unsigned int old_nofs;
+ ssize_t ret = -ENOBUFS;
+ size_t len = iov_iter_count(iter);
+
+ if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE))
+ goto presubmission_error;
+ fscache_count_write();
+ object = cachefiles_cres_object(cres);
+ file = cachefiles_cres_file(cres);
+
+ _enter("%pD,%li,%llx,%zx/%llx",
+ file, file_inode(file)->i_ino, start_pos, len,
+ i_size_read(file_inode(file)));
+
+ ret = -ENOMEM;
+ ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
+ if (!ki)
+ goto presubmission_error;
+
+ refcount_set(&ki->ki_refcnt, 2);
+ ki->iocb.ki_filp = file;
+ ki->iocb.ki_pos = start_pos;
+ ki->iocb.ki_flags = IOCB_DIRECT | IOCB_WRITE;
+ ki->iocb.ki_hint = ki_hint_validate(file_write_hint(file));
+ ki->iocb.ki_ioprio = get_current_ioprio();
+ ki->object = object;
+ ki->inval_counter = cres->inval_counter;
+ ki->start = start_pos;
+ ki->len = len;
+ ki->term_func = term_func;
+ ki->term_func_priv = term_func_priv;
+ ki->was_async = true;
+
+ if (ki->term_func)
+ ki->iocb.ki_complete = cachefiles_write_complete;
+
+ /* Open-code file_start_write here to grab freeze protection, which
+ * will be released by another thread in aio_complete_rw(). Fool
+ * lockdep by telling it the lock got released so that it doesn't
+ * complain about the held lock when we return to userspace.
+ */
+ inode = file_inode(file);
+ __sb_start_write(inode->i_sb, SB_FREEZE_WRITE);
+ __sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);
+
+ get_file(ki->iocb.ki_filp);
+ cachefiles_grab_object(object, cachefiles_obj_get_ioreq);
+
+ trace_cachefiles_write(object, inode, ki->iocb.ki_pos, len);
+ old_nofs = memalloc_nofs_save();
+ ret = cachefiles_inject_write_error();
+ if (ret == 0)
+ ret = vfs_iocb_iter_write(file, &ki->iocb, iter);
+ memalloc_nofs_restore(old_nofs);
+ switch (ret) {
+ case -EIOCBQUEUED:
+ goto in_progress;
+
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ case -ERESTARTNOHAND:
+ case -ERESTART_RESTARTBLOCK:
+ /* There's no easy way to restart the syscall since other AIO's
+ * may be already running. Just fail this IO with EINTR.
+ */
+ ret = -EINTR;
+ fallthrough;
+ default:
+ ki->was_async = false;
+ cachefiles_write_complete(&ki->iocb, ret, 0);
+ if (ret > 0)
+ ret = 0;
+ break;
+ }
+
+in_progress:
+ cachefiles_put_kiocb(ki);
+ _leave(" = %zd", ret);
+ return ret;
+
+presubmission_error:
+ if (term_func)
+ term_func(term_func_priv, ret, false);
+ return ret;
+}
+
+/*
+ * Prepare a read operation, shortening it to a cached/uncached
+ * boundary as appropriate.
+ */
+static enum netfs_read_source cachefiles_prepare_read(struct netfs_read_subrequest *subreq,
+ loff_t i_size)
+{
+ enum cachefiles_prepare_read_trace why;
+ struct netfs_read_request *rreq = subreq->rreq;
+ struct netfs_cache_resources *cres = &rreq->cache_resources;
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ struct fscache_cookie *cookie = fscache_cres_cookie(cres);
+ const struct cred *saved_cred;
+ struct file *file = cachefiles_cres_file(cres);
+ enum netfs_read_source ret = NETFS_DOWNLOAD_FROM_SERVER;
+ loff_t off, to;
+ ino_t ino = file ? file_inode(file)->i_ino : 0;
+
+ _enter("%zx @%llx/%llx", subreq->len, subreq->start, i_size);
+
+ if (subreq->start >= i_size) {
+ ret = NETFS_FILL_WITH_ZEROES;
+ why = cachefiles_trace_read_after_eof;
+ goto out_no_object;
+ }
+
+ if (test_bit(FSCACHE_COOKIE_NO_DATA_TO_READ, &cookie->flags)) {
+ __set_bit(NETFS_SREQ_WRITE_TO_CACHE, &subreq->flags);
+ why = cachefiles_trace_read_no_data;
+ goto out_no_object;
+ }
+
+ /* The object and the file may be being created in the background. */
+ if (!file) {
+ why = cachefiles_trace_read_no_file;
+ if (!fscache_wait_for_operation(cres, FSCACHE_WANT_READ))
+ goto out_no_object;
+ file = cachefiles_cres_file(cres);
+ if (!file)
+ goto out_no_object;
+ ino = file_inode(file)->i_ino;
+ }
+
+ object = cachefiles_cres_object(cres);
+ cache = object->volume->cache;
+ cachefiles_begin_secure(cache, &saved_cred);
+
+ off = cachefiles_inject_read_error();
+ if (off == 0)
+ off = vfs_llseek(file, subreq->start, SEEK_DATA);
+ if (off < 0 && off >= (loff_t)-MAX_ERRNO) {
+ if (off == (loff_t)-ENXIO) {
+ why = cachefiles_trace_read_seek_nxio;
+ goto download_and_store;
+ }
+ trace_cachefiles_io_error(object, file_inode(file), off,
+ cachefiles_trace_seek_error);
+ why = cachefiles_trace_read_seek_error;
+ goto out;
+ }
+
+ if (off >= subreq->start + subreq->len) {
+ why = cachefiles_trace_read_found_hole;
+ goto download_and_store;
+ }
+
+ if (off > subreq->start) {
+ off = round_up(off, cache->bsize);
+ subreq->len = off - subreq->start;
+ why = cachefiles_trace_read_found_part;
+ goto download_and_store;
+ }
+
+ to = cachefiles_inject_read_error();
+ if (to == 0)
+ to = vfs_llseek(file, subreq->start, SEEK_HOLE);
+ if (to < 0 && to >= (loff_t)-MAX_ERRNO) {
+ trace_cachefiles_io_error(object, file_inode(file), to,
+ cachefiles_trace_seek_error);
+ why = cachefiles_trace_read_seek_error;
+ goto out;
+ }
+
+ if (to < subreq->start + subreq->len) {
+ if (subreq->start + subreq->len >= i_size)
+ to = round_up(to, cache->bsize);
+ else
+ to = round_down(to, cache->bsize);
+ subreq->len = to - subreq->start;
+ }
+
+ why = cachefiles_trace_read_have_data;
+ ret = NETFS_READ_FROM_CACHE;
+ goto out;
+
+download_and_store:
+ __set_bit(NETFS_SREQ_WRITE_TO_CACHE, &subreq->flags);
+out:
+ cachefiles_end_secure(cache, saved_cred);
+out_no_object:
+ trace_cachefiles_prep_read(subreq, ret, why, ino);
+ return ret;
+}
+
+/*
+ * Prepare for a write to occur.
+ */
+static int __cachefiles_prepare_write(struct netfs_cache_resources *cres,
+ loff_t *_start, size_t *_len, loff_t i_size,
+ bool no_space_allocated_yet)
+{
+ struct cachefiles_object *object = cachefiles_cres_object(cres);
+ struct cachefiles_cache *cache = object->volume->cache;
+ struct file *file = cachefiles_cres_file(cres);
+ loff_t start = *_start, pos;
+ size_t len = *_len, down;
+ int ret;
+
+ /* Round to DIO size */
+ down = start - round_down(start, PAGE_SIZE);
+ *_start = start - down;
+ *_len = round_up(down + len, PAGE_SIZE);
+
+ /* We need to work out whether there's sufficient disk space to perform
+ * the write - but we can skip that check if we have space already
+ * allocated.
+ */
+ if (no_space_allocated_yet)
+ goto check_space;
+
+ pos = cachefiles_inject_read_error();
+ if (pos == 0)
+ pos = vfs_llseek(file, *_start, SEEK_DATA);
+ if (pos < 0 && pos >= (loff_t)-MAX_ERRNO) {
+ if (pos == -ENXIO)
+ goto check_space; /* Unallocated tail */
+ trace_cachefiles_io_error(object, file_inode(file), pos,
+ cachefiles_trace_seek_error);
+ return pos;
+ }
+ if ((u64)pos >= (u64)*_start + *_len)
+ goto check_space; /* Unallocated region */
+
+ /* We have a block that's at least partially filled - if we're low on
+ * space, we need to see if it's fully allocated. If it's not, we may
+ * want to cull it.
+ */
+ if (cachefiles_has_space(cache, 0, *_len / PAGE_SIZE) == 0)
+ return 0; /* Enough space to simply overwrite the whole block */
+
+ pos = cachefiles_inject_read_error();
+ if (pos == 0)
+ pos = vfs_llseek(file, *_start, SEEK_HOLE);
+ if (pos < 0 && pos >= (loff_t)-MAX_ERRNO) {
+ trace_cachefiles_io_error(object, file_inode(file), pos,
+ cachefiles_trace_seek_error);
+ return pos;
+ }
+ if ((u64)pos >= (u64)*_start + *_len)
+ return 0; /* Fully allocated */
+
+ /* Partially allocated, but insufficient space: cull. */
+ pos = cachefiles_inject_remove_error();
+ if (pos == 0)
+ ret = vfs_fallocate(file, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+ *_start, *_len);
+ if (ret < 0) {
+ trace_cachefiles_io_error(object, file_inode(file), ret,
+ cachefiles_trace_fallocate_error);
+ cachefiles_io_error_obj(object,
+ "CacheFiles: fallocate failed (%d)\n", ret);
+ ret = -EIO;
+ }
+
+ return ret;
+
+check_space:
+ return cachefiles_has_space(cache, 0, *_len / PAGE_SIZE);
+}
+
+static int cachefiles_prepare_write(struct netfs_cache_resources *cres,
+ loff_t *_start, size_t *_len, loff_t i_size,
+ bool no_space_allocated_yet)
+{
+ struct cachefiles_object *object = cachefiles_cres_object(cres);
+ struct cachefiles_cache *cache = object->volume->cache;
+ const struct cred *saved_cred;
+ int ret;
+
+ if (!cachefiles_cres_file(cres)) {
+ if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE))
+ return -ENOBUFS;
+ if (!cachefiles_cres_file(cres))
+ return -ENOBUFS;
+ }
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = __cachefiles_prepare_write(cres, _start, _len, i_size,
+ no_space_allocated_yet);
+ cachefiles_end_secure(cache, saved_cred);
+ return ret;
+}
+
+/*
+ * Prepare for a write to occur from the fallback I/O API.
+ */
+static int cachefiles_prepare_fallback_write(struct netfs_cache_resources *cres,
+ pgoff_t index)
+{
+ struct cachefiles_object *object = cachefiles_cres_object(cres);
+ struct cachefiles_cache *cache = object->volume->cache;
+
+ _enter("%lx", index);
+
+ return cachefiles_has_space(cache, 0, 1);
+}
+
/*
* Clean up an operation.
*/
@@ -28,6 +545,11 @@ static void cachefiles_end_operation(struct netfs_cache_resources *cres)
static const struct netfs_cache_ops cachefiles_netfs_cache_ops = {
.end_operation = cachefiles_end_operation,
+ .read = cachefiles_read,
+ .write = cachefiles_write,
+ .prepare_read = cachefiles_prepare_read,
+ .prepare_write = cachefiles_prepare_write,
+ .prepare_fallback_write = cachefiles_prepare_fallback_write,
};
/*
diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h
index 5412991ab5e1..e13e7e452c4d 100644
--- a/include/trace/events/cachefiles.h
+++ b/include/trace/events/cachefiles.h
@@ -407,6 +407,105 @@ TRACE_EVENT(cachefiles_coherency,
__entry->content)
);
+TRACE_EVENT(cachefiles_prep_read,
+ TP_PROTO(struct netfs_read_subrequest *sreq,
+ enum netfs_read_source source,
+ enum cachefiles_prepare_read_trace why,
+ ino_t cache_inode),
+
+ TP_ARGS(sreq, source, why, cache_inode),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, rreq )
+ __field(unsigned short, index )
+ __field(unsigned short, flags )
+ __field(enum netfs_read_source, source )
+ __field(enum cachefiles_prepare_read_trace, why )
+ __field(size_t, len )
+ __field(loff_t, start )
+ __field(unsigned int, netfs_inode )
+ __field(unsigned int, cache_inode )
+ ),
+
+ TP_fast_assign(
+ __entry->rreq = sreq->rreq->debug_id;
+ __entry->index = sreq->debug_index;
+ __entry->flags = sreq->flags;
+ __entry->source = source;
+ __entry->why = why;
+ __entry->len = sreq->len;
+ __entry->start = sreq->start;
+ __entry->netfs_inode = sreq->rreq->inode->i_ino;
+ __entry->cache_inode = cache_inode;
+ ),
+
+ TP_printk("R=%08x[%u] %s %s f=%02x s=%llx %zx ni=%x b=%x",
+ __entry->rreq, __entry->index,
+ __print_symbolic(__entry->source, netfs_sreq_sources),
+ __print_symbolic(__entry->why, cachefiles_prepare_read_traces),
+ __entry->flags,
+ __entry->start, __entry->len,
+ __entry->netfs_inode, __entry->cache_inode)
+ );
+
+TRACE_EVENT(cachefiles_read,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct inode *backer,
+ loff_t start,
+ size_t len),
+
+ TP_ARGS(obj, backer, start, len),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, backer )
+ __field(size_t, len )
+ __field(loff_t, start )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->backer = backer->i_ino;
+ __entry->start = start;
+ __entry->len = len;
+ ),
+
+ TP_printk("o=%08x b=%08x s=%llx l=%zx",
+ __entry->obj,
+ __entry->backer,
+ __entry->start,
+ __entry->len)
+ );
+
+TRACE_EVENT(cachefiles_write,
+ TP_PROTO(struct cachefiles_object *obj,
+ struct inode *backer,
+ loff_t start,
+ size_t len),
+
+ TP_ARGS(obj, backer, start, len),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, obj )
+ __field(unsigned int, backer )
+ __field(size_t, len )
+ __field(loff_t, start )
+ ),
+
+ TP_fast_assign(
+ __entry->obj = obj->debug_id;
+ __entry->backer = backer->i_ino;
+ __entry->start = start;
+ __entry->len = len;
+ ),
+
+ TP_printk("o=%08x b=%08x s=%llx l=%zx",
+ __entry->obj,
+ __entry->backer,
+ __entry->start,
+ __entry->len)
+ );
+
TRACE_EVENT(cachefiles_trunc,
TP_PROTO(struct cachefiles_object *obj, struct inode *backer,
loff_t from, loff_t to, enum cachefiles_trunc_trace why),
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 41/53] afs: Handle len being extending over page end in write_begin/write_end
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (39 preceding siblings ...)
2021-10-22 19:08 ` [PATCH v2 40/53] cachefiles: Implement the I/O routines David Howells
@ 2021-10-22 19:08 ` David Howells
2021-10-22 19:08 ` [PATCH v2 42/53] afs: Fix afs_write_end() to handle len > page size David Howells
` (13 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:08 UTC (permalink / raw)
To: linux-cachefs
Cc: Matthew Wilcox (Oracle),
Jeff Layton, Marc Dionne, linux-afs, dhowells, Trond Myklebust,
Anna Schumaker, Steve French, Dominique Martinet, Jeff Layton,
Matthew Wilcox, Alexander Viro, Omar Sandoval, Linus Torvalds,
linux-afs, linux-nfs, linux-cifs, ceph-devel, v9fs-developer,
linux-fsdevel, linux-kernel
With transparent huge pages, in the future, write_begin() and write_end()
may be passed a length parameter that, in combination with the offset into
the page, exceeds the length of that page. This allows
grab_cache_page_write_begin() to better choose the size of THP to allocate.
Fix afs's functions to handle this by trimming the length as needed after
the page has been allocated.
[Removed the now-unnecessary index var; spotted by kernel test robot]
Fixes: e1b1240c1ff5 ("netfs: Add write_begin helper")
Reported-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/162367681795.460125.11729955608839747375.stgit@warthog.procyon.org.uk/ # v1
---
fs/afs/write.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 8e9cb1fcb412..ced72c6b9a80 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -25,7 +25,8 @@ int afs_set_page_dirty(struct page *page)
}
/*
- * prepare to perform part of a write to a page
+ * Prepare to perform part of a write to a page. Note that len may extend
+ * beyond the end of the page.
*/
int afs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
@@ -36,7 +37,6 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
unsigned long priv;
unsigned f, from;
unsigned t, to;
- pgoff_t index;
int ret;
_enter("{%llx:%llu},%llx,%x",
@@ -51,8 +51,8 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
if (ret < 0)
return ret;
- index = page->index;
- from = pos - index * PAGE_SIZE;
+ from = offset_in_thp(page, pos);
+ len = min_t(size_t, len, thp_size(page) - from);
to = from + len;
try_again:
@@ -103,7 +103,8 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
}
/*
- * finalise part of a write to a page
+ * Finalise part of a write to a page. Note that len may extend beyond the end
+ * of the page.
*/
int afs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
@@ -111,7 +112,7 @@ int afs_write_end(struct file *file, struct address_space *mapping,
{
struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
unsigned long priv;
- unsigned int f, from = pos & (thp_size(page) - 1);
+ unsigned int f, from = offset_in_thp(page, pos);
unsigned int t, to = from + copied;
loff_t i_size, maybe_i_size;
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 42/53] afs: Fix afs_write_end() to handle len > page size
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (40 preceding siblings ...)
2021-10-22 19:08 ` [PATCH v2 41/53] afs: Handle len being extending over page end in write_begin/write_end David Howells
@ 2021-10-22 19:08 ` David Howells
2021-10-22 19:08 ` [PATCH v2 43/53] afs: Make afs_write_begin() return the THP subpage David Howells
` (12 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:08 UTC (permalink / raw)
To: linux-cachefs
Cc: Jeff Layton, Jeff Layton, Marc Dionne, Al Viro, Matthew Wilcox,
linux-afs, dhowells, Trond Myklebust, Anna Schumaker,
Steve French, Dominique Martinet, Jeff Layton, Matthew Wilcox,
Alexander Viro, Omar Sandoval, Linus Torvalds, linux-afs,
linux-nfs, linux-cifs, ceph-devel, v9fs-developer, linux-fsdevel,
linux-kernel
It is possible for the len argument to afs_write_end() to overrun the end
of the page (len is used to key the size of the page in afs_write_start()
when compound pages become a regular thing).
Fix afs_write_end() to correctly trim the write length so that it doesn't
exceed the end of the page.
Fixes: 3003bbd0697b ("afs: Use the netfs_write_begin() helper")
Reported-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Matthew Wilcox <willy@infradead.org>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/162367682522.460125.5652091227576721609.stgit@warthog.procyon.org.uk/ # v1
---
fs/afs/write.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/afs/write.c b/fs/afs/write.c
index ced72c6b9a80..19be3153d610 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -119,6 +119,7 @@ int afs_write_end(struct file *file, struct address_space *mapping,
_enter("{%llx:%llu},{%lx}",
vnode->fid.vid, vnode->fid.vnode, page->index);
+ len = min_t(size_t, len, thp_size(page) - from);
if (!PageUptodate(page)) {
if (copied < len) {
copied = 0;
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 43/53] afs: Make afs_write_begin() return the THP subpage
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (41 preceding siblings ...)
2021-10-22 19:08 ` [PATCH v2 42/53] afs: Fix afs_write_end() to handle len > page size David Howells
@ 2021-10-22 19:08 ` David Howells
2021-10-22 19:08 ` [PATCH v2 44/53] afs: Convert afs to use the new fscache API David Howells
` (11 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:08 UTC (permalink / raw)
To: linux-cachefs
Cc: Marc Dionne, Matthew Wilcox, linux-afs, dhowells,
Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
generic_perform_write() can't handle a THP, so we have to return the
subpage of that THP from afs_write_begin() and then convert it back into
the head on entry to afs_write_end().
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Matthew Wilcox <willy@infradead.org>
cc: linux-afs@lists.infradead.org
---
fs/afs/write.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 19be3153d610..a01b1687a146 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -78,7 +78,7 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
goto flush_conflicting_write;
}
- *_page = page;
+ *_page = find_subpage(page, pos / PAGE_SIZE);
_leave(" = 0");
return 0;
@@ -108,9 +108,10 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
*/
int afs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
+ struct page *subpage, void *fsdata)
{
struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
+ struct page *page = thp_head(subpage);
unsigned long priv;
unsigned int f, from = offset_in_thp(page, pos);
unsigned int t, to = from + copied;
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 44/53] afs: Convert afs to use the new fscache API
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (42 preceding siblings ...)
2021-10-22 19:08 ` [PATCH v2 43/53] afs: Make afs_write_begin() return the THP subpage David Howells
@ 2021-10-22 19:08 ` David Howells
2021-10-22 19:09 ` [PATCH v2 45/53] afs: Copy local writes to the cache when writing to the server David Howells
` (10 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:08 UTC (permalink / raw)
To: linux-cachefs
Cc: Marc Dionne, linux-afs, dhowells, Trond Myklebust,
Anna Schumaker, Steve French, Dominique Martinet, Jeff Layton,
Matthew Wilcox, Alexander Viro, Omar Sandoval, Linus Torvalds,
linux-afs, linux-nfs, linux-cifs, ceph-devel, v9fs-developer,
linux-fsdevel, linux-kernel
Change the afs filesystem to support the new afs driver.
The following changes have been made:
(1) The fscache_netfs struct is no more, and there's no need to register
the filesystem as a whole. There's also no longer a cell cookie.
(2) The volume cookie is now an fscache_volume cookie, allocated with
fscache_acquire_volume(). This function takes three parameters: a
string representing the "volume" in the index, a string naming the
cache to use (or NULL) and a u64 that conveys coherency metadata for
the volume.
For afs, I've made it render the volume name string as:
"afs,<cell>,<volume_id>"
and the coherency data is currently 0.
(3) The fscache_cookie_def is no more and needed information is passed
directly to fscache_acquire_cookie(). The cache no longer calls back
into the filesystem, but rather metadata changes are indicated at
other times.
fscache_acquire_cookie() is passed the same keying and coherency
information as before, except that these are now stored in big endian
form instead of cpu endian. This makes the cache more copyable.
(4) fscache_use_cookie() and fscache_unuse_cookie() are called when a file
is opened or closed to prevent a cache file from being culled and to
keep resources to hand that are needed to do I/O.
fscache_use_cookie() is given an indication if the cache is likely to
be modified locally (e.g. the file is open for writing).
fscache_unuse_cookie() is given a coherency update if we had the file
open for writing and will update that.
(5) fscache_invalidate() is now given uptodate auxiliary data and a file
size. It can also take a flag to indicate if this was due to a DIO
write. This is wrapped into afs_fscache_invalidate() now for
convenience.
(6) fscache_resize() now gets called from the finalisation of
afs_setattr(), and afs_setattr() does use/unuse of the cookie around
the call to support this.
(7) fscache_note_page_release() is called from afs_release_page().
(8) Use a killable wait in nfs_vm_page_mkwrite() when waiting for
PG_fscache to be cleared.
Render the parts of the cookie key for an afs inode cookie as big endian.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-cachefs@redhat.com
---
fs/afs/Kconfig | 2 +-
fs/afs/Makefile | 3 --
fs/afs/cache.c | 68 -----------------------------------------------------
fs/afs/cell.c | 12 ---------
fs/afs/file.c | 18 ++++++++++++--
fs/afs/inode.c | 50 +++++++++++++++++++--------------------
fs/afs/internal.h | 31 ++++++++++++++----------
fs/afs/main.c | 14 -----------
fs/afs/volume.c | 15 +++++++-----
fs/afs/write.c | 1 -
10 files changed, 69 insertions(+), 145 deletions(-)
delete mode 100644 fs/afs/cache.c
diff --git a/fs/afs/Kconfig b/fs/afs/Kconfig
index dbb1ee5fb261..fc8ba9142f2f 100644
--- a/fs/afs/Kconfig
+++ b/fs/afs/Kconfig
@@ -25,7 +25,7 @@ config AFS_DEBUG
config AFS_FSCACHE
bool "Provide AFS client caching support"
- depends on AFS_FS=m && FSCACHE_OLD || AFS_FS=y && FSCACHE_OLD=y
+ depends on AFS_FS=m && FSCACHE || AFS_FS=y && FSCACHE=y
help
Say Y here if you want AFS data to be cached locally on disk through
the generic filesystem cache manager
diff --git a/fs/afs/Makefile b/fs/afs/Makefile
index 75c4e4043d1d..e8956b65d7ff 100644
--- a/fs/afs/Makefile
+++ b/fs/afs/Makefile
@@ -3,10 +3,7 @@
# Makefile for Red Hat Linux AFS client.
#
-afs-cache-$(CONFIG_AFS_FSCACHE) := cache.o
-
kafs-y := \
- $(afs-cache-y) \
addr_list.o \
callback.o \
cell.o \
diff --git a/fs/afs/cache.c b/fs/afs/cache.c
deleted file mode 100644
index 037af93e3aba..000000000000
--- a/fs/afs/cache.c
+++ /dev/null
@@ -1,68 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* AFS caching stuff
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/sched.h>
-#include "internal.h"
-
-static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
- const void *buffer,
- uint16_t buflen,
- loff_t object_size);
-
-struct fscache_netfs afs_cache_netfs = {
- .name = "afs",
- .version = 2,
-};
-
-struct fscache_cookie_def afs_cell_cache_index_def = {
- .name = "AFS.cell",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-
-struct fscache_cookie_def afs_volume_cache_index_def = {
- .name = "AFS.volume",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-
-struct fscache_cookie_def afs_vnode_cache_index_def = {
- .name = "AFS.vnode",
- .type = FSCACHE_COOKIE_TYPE_DATAFILE,
- .check_aux = afs_vnode_cache_check_aux,
-};
-
-/*
- * check that the auxiliary data indicates that the entry is still valid
- */
-static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
- const void *buffer,
- uint16_t buflen,
- loff_t object_size)
-{
- struct afs_vnode *vnode = cookie_netfs_data;
- struct afs_vnode_cache_aux aux;
-
- _enter("{%llx,%x,%llx},%p,%u",
- vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
- buffer, buflen);
-
- memcpy(&aux, buffer, sizeof(aux));
-
- /* check the size of the data is what we're expecting */
- if (buflen != sizeof(aux)) {
- _leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));
- return FSCACHE_CHECKAUX_OBSOLETE;
- }
-
- if (vnode->status.data_version != aux.data_version) {
- _leave(" = OBSOLETE [vers %llx != %llx]",
- aux.data_version, vnode->status.data_version);
- return FSCACHE_CHECKAUX_OBSOLETE;
- }
-
- _leave(" = SUCCESS");
- return FSCACHE_CHECKAUX_OKAY;
-}
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index d88407fb9bc0..07ad744eef77 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -680,13 +680,6 @@ static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell)
return ret;
}
-#ifdef CONFIG_AFS_FSCACHE
- cell->cache = fscache_acquire_cookie(afs_cache_netfs.primary_index,
- &afs_cell_cache_index_def,
- cell->name, strlen(cell->name),
- NULL, 0,
- cell, 0, true);
-#endif
ret = afs_proc_cell_setup(cell);
if (ret < 0)
return ret;
@@ -723,11 +716,6 @@ static void afs_deactivate_cell(struct afs_net *net, struct afs_cell *cell)
afs_dynroot_rmdir(net, cell);
mutex_unlock(&net->proc_cells_lock);
-#ifdef CONFIG_AFS_FSCACHE
- fscache_relinquish_cookie(cell->cache, NULL, false);
- cell->cache = NULL;
-#endif
-
_leave("");
}
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 4d5b6bfcf815..43424af240ab 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -151,7 +151,9 @@ int afs_open(struct inode *inode, struct file *file)
if (file->f_flags & O_TRUNC)
set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
-
+
+ fscache_use_cookie(afs_vnode_cache(vnode), file->f_mode & FMODE_WRITE);
+
file->private_data = af;
_leave(" = 0");
return 0;
@@ -170,8 +172,10 @@ int afs_open(struct inode *inode, struct file *file)
*/
int afs_release(struct inode *inode, struct file *file)
{
+ struct afs_vnode_cache_aux aux;
struct afs_vnode *vnode = AFS_FS_I(inode);
struct afs_file *af = file->private_data;
+ loff_t i_size;
int ret = 0;
_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
@@ -182,6 +186,15 @@ int afs_release(struct inode *inode, struct file *file)
file->private_data = NULL;
if (af->wb)
afs_put_wb_key(af->wb);
+
+ if ((file->f_mode & FMODE_WRITE)) {
+ i_size = i_size_read(&vnode->vfs_inode);
+ afs_set_cache_aux(vnode, &aux);
+ fscache_unuse_cookie(afs_vnode_cache(vnode), &aux, &i_size);
+ } else {
+ fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
+ }
+
key_put(af->key);
kfree(af);
afs_prune_wb_keys(vnode);
@@ -344,7 +357,7 @@ static bool afs_is_cache_enabled(struct inode *inode)
{
struct fscache_cookie *cookie = afs_vnode_cache(AFS_FS_I(inode));
- return fscache_cookie_enabled(cookie) && !hlist_empty(&cookie->backing_objects);
+ return fscache_cookie_enabled(cookie) && cookie->cache_priv;
}
static int afs_begin_cache_operation(struct netfs_read_request *rreq)
@@ -485,6 +498,7 @@ static int afs_releasepage(struct page *page, gfp_t gfp_flags)
return false;
wait_on_page_fscache(page);
}
+ fscache_note_page_release(afs_vnode_cache(vnode));
#endif
if (PagePrivate(page)) {
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 8fcffea2daf5..be5ca9bf49ae 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -413,9 +413,9 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
{
#ifdef CONFIG_AFS_FSCACHE
struct {
- u32 vnode_id;
- u32 unique;
- u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
+ __be32 vnode_id;
+ __be32 unique;
+ __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */
} __packed key;
struct afs_vnode_cache_aux aux;
@@ -424,17 +424,18 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
return;
}
- key.vnode_id = vnode->fid.vnode;
- key.unique = vnode->fid.unique;
- key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
- key.vnode_id_ext[1] = vnode->fid.vnode_hi;
- aux.data_version = vnode->status.data_version;
-
- vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
- &afs_vnode_cache_index_def,
- &key, sizeof(key),
- &aux, sizeof(aux),
- vnode, vnode->status.size, true);
+ key.vnode_id = htonl(vnode->fid.vnode);
+ key.unique = htonl(vnode->fid.unique);
+ key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32);
+ key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi);
+ afs_set_cache_aux(vnode, &aux);
+
+ vnode->cache = fscache_acquire_cookie(
+ vnode->volume->cache,
+ vnode->status.type == AFS_FTYPE_FILE ? 0 : FSCACHE_ADV_SINGLE_CHUNK,
+ &key, sizeof(key),
+ &aux, sizeof(aux),
+ vnode->status.size);
#endif
}
@@ -563,9 +564,7 @@ static void afs_zap_data(struct afs_vnode *vnode)
{
_enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
-#ifdef CONFIG_AFS_FSCACHE
- fscache_invalidate(vnode->cache);
-#endif
+ afs_invalidate_cache(vnode, 0);
/* nuke all the non-dirty pages that aren't locked, mapped or being
* written back in a regular file and completely discard the pages in a
@@ -786,14 +785,9 @@ void afs_evict_inode(struct inode *inode)
}
#ifdef CONFIG_AFS_FSCACHE
- {
- struct afs_vnode_cache_aux aux;
-
- aux.data_version = vnode->status.data_version;
- fscache_relinquish_cookie(vnode->cache, &aux,
- test_bit(AFS_VNODE_DELETED, &vnode->flags));
- vnode->cache = NULL;
- }
+ fscache_relinquish_cookie(vnode->cache,
+ test_bit(AFS_VNODE_DELETED, &vnode->flags));
+ vnode->cache = NULL;
#endif
afs_prune_wb_keys(vnode);
@@ -833,6 +827,9 @@ static void afs_setattr_edit_file(struct afs_operation *op)
if (size < i_size)
truncate_pagecache(inode, size);
+ if (size != i_size)
+ fscache_resize_cookie(afs_vnode_cache(vp->vnode),
+ vp->scb.status.size);
}
}
@@ -876,6 +873,8 @@ int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
attr->ia_valid &= ~ATTR_SIZE;
}
+ fscache_use_cookie(afs_vnode_cache(vnode), true);
+
/* flush any dirty data outstanding on a regular file */
if (S_ISREG(vnode->vfs_inode.i_mode))
filemap_write_and_wait(vnode->vfs_inode.i_mapping);
@@ -907,6 +906,7 @@ int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
out_unlock:
up_write(&vnode->validate_lock);
+ fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
_leave(" = %d", ret);
return ret;
}
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index a70451bf5b33..6c591b7c55f1 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -15,7 +15,7 @@
#include <linux/workqueue.h>
#include <linux/sched.h>
#define FSCACHE_USE_NEW_IO_API
-#include <linux/fscache_old.h>
+#include <linux/fscache.h>
#include <linux/backing-dev.h>
#include <linux/uuid.h>
#include <linux/mm_types.h>
@@ -364,9 +364,6 @@ struct afs_cell {
struct key *anonymous_key; /* anonymous user key for this cell */
struct work_struct manager; /* Manager for init/deinit/dns */
struct hlist_node proc_link; /* /proc cell list link */
-#ifdef CONFIG_AFS_FSCACHE
- struct fscache_cookie *cache; /* caching cookie */
-#endif
time64_t dns_expiry; /* Time AFSDB/SRV record expires */
time64_t last_inactive; /* Time of last drop of usage count */
atomic_t ref; /* Struct refcount */
@@ -590,7 +587,7 @@ struct afs_volume {
#define AFS_VOLUME_BUSY 5 /* - T if volume busy notice given */
#define AFS_VOLUME_MAYBE_NO_IBULK 6 /* - T if some servers don't have InlineBulkStatus */
#ifdef CONFIG_AFS_FSCACHE
- struct fscache_cookie *cache; /* caching cookie */
+ struct fscache_volume *cache; /* Caching cookie */
#endif
struct afs_server_list __rcu *servers; /* List of servers on which volume resides */
rwlock_t servers_lock; /* Lock for ->servers */
@@ -872,9 +869,24 @@ struct afs_operation {
* Cache auxiliary data.
*/
struct afs_vnode_cache_aux {
- u64 data_version;
+ __be64 data_version;
} __packed;
+static inline void afs_set_cache_aux(struct afs_vnode *vnode,
+ struct afs_vnode_cache_aux *aux)
+{
+ aux->data_version = cpu_to_be64(vnode->status.data_version);
+}
+
+static inline void afs_invalidate_cache(struct afs_vnode *vnode, unsigned int flags)
+{
+ struct afs_vnode_cache_aux aux;
+
+ afs_set_cache_aux(vnode, &aux);
+ fscache_invalidate(afs_vnode_cache(vnode), &aux,
+ i_size_read(&vnode->vfs_inode), flags);
+}
+
/*
* We use page->private to hold the amount of the page that we've written to,
* splitting the field into two parts. However, we need to represent a range
@@ -962,13 +974,6 @@ extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
*/
#ifdef CONFIG_AFS_FSCACHE
extern struct fscache_netfs afs_cache_netfs;
-extern struct fscache_cookie_def afs_cell_cache_index_def;
-extern struct fscache_cookie_def afs_volume_cache_index_def;
-extern struct fscache_cookie_def afs_vnode_cache_index_def;
-#else
-#define afs_cell_cache_index_def (*(struct fscache_cookie_def *) NULL)
-#define afs_volume_cache_index_def (*(struct fscache_cookie_def *) NULL)
-#define afs_vnode_cache_index_def (*(struct fscache_cookie_def *) NULL)
#endif
/*
diff --git a/fs/afs/main.c b/fs/afs/main.c
index 179004b15566..eae288c8d40a 100644
--- a/fs/afs/main.c
+++ b/fs/afs/main.c
@@ -186,13 +186,6 @@ static int __init afs_init(void)
if (!afs_lock_manager)
goto error_lockmgr;
-#ifdef CONFIG_AFS_FSCACHE
- /* we want to be able to cache */
- ret = fscache_register_netfs(&afs_cache_netfs);
- if (ret < 0)
- goto error_cache;
-#endif
-
ret = register_pernet_device(&afs_net_ops);
if (ret < 0)
goto error_net;
@@ -215,10 +208,6 @@ static int __init afs_init(void)
error_fs:
unregister_pernet_device(&afs_net_ops);
error_net:
-#ifdef CONFIG_AFS_FSCACHE
- fscache_unregister_netfs(&afs_cache_netfs);
-error_cache:
-#endif
destroy_workqueue(afs_lock_manager);
error_lockmgr:
destroy_workqueue(afs_async_calls);
@@ -245,9 +234,6 @@ static void __exit afs_exit(void)
proc_remove(afs_proc_symlink);
afs_fs_exit();
unregister_pernet_device(&afs_net_ops);
-#ifdef CONFIG_AFS_FSCACHE
- fscache_unregister_netfs(&afs_cache_netfs);
-#endif
destroy_workqueue(afs_lock_manager);
destroy_workqueue(afs_async_calls);
destroy_workqueue(afs_wq);
diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index f84194b791d3..1269ec08170e 100644
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -271,11 +271,14 @@ void afs_put_volume(struct afs_net *net, struct afs_volume *volume,
void afs_activate_volume(struct afs_volume *volume)
{
#ifdef CONFIG_AFS_FSCACHE
- volume->cache = fscache_acquire_cookie(volume->cell->cache,
- &afs_volume_cache_index_def,
- &volume->vid, sizeof(volume->vid),
- NULL, 0,
- volume, 0, true);
+ char *name;
+
+ name = kasprintf(GFP_KERNEL, "afs,%s,%llx",
+ volume->cell->name, volume->vid);
+ if (name) {
+ volume->cache = fscache_acquire_volume(name, NULL, 0);
+ kfree(name);
+ }
#endif
}
@@ -287,7 +290,7 @@ void afs_deactivate_volume(struct afs_volume *volume)
_enter("%s", volume->name);
#ifdef CONFIG_AFS_FSCACHE
- fscache_relinquish_cookie(volume->cache, NULL,
+ fscache_relinquish_volume(volume->cache, 0,
test_bit(AFS_VOLUME_DELETED, &volume->flags));
volume->cache = NULL;
#endif
diff --git a/fs/afs/write.c b/fs/afs/write.c
index a01b1687a146..55c5c963d42d 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -12,7 +12,6 @@
#include <linux/writeback.h>
#include <linux/pagevec.h>
#include <linux/netfs.h>
-#include <linux/fscache_old.h>
#include "internal.h"
/*
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 45/53] afs: Copy local writes to the cache when writing to the server
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (43 preceding siblings ...)
2021-10-22 19:08 ` [PATCH v2 44/53] afs: Convert afs to use the new fscache API David Howells
@ 2021-10-22 19:09 ` David Howells
2021-10-22 19:09 ` [PATCH v2 46/53] afs: Skip truncation on the server of data we haven't written yet David Howells
` (9 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:09 UTC (permalink / raw)
To: linux-cachefs
Cc: Marc Dionne, linux-afs, dhowells, Trond Myklebust,
Anna Schumaker, Steve French, Dominique Martinet, Jeff Layton,
Matthew Wilcox, Alexander Viro, Omar Sandoval, Linus Torvalds,
linux-afs, linux-nfs, linux-cifs, ceph-devel, v9fs-developer,
linux-fsdevel, linux-kernel
When writing to the server from afs_writepage() or afs_writepages(), copy
the data to the cache object too.
To make this possible, the cookie must have its active users count
incremented when the page is dirtied and kept incremented until we manage
to clean up all the pages. This allows the writeback to take place after
the last file struct is released.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-cachefs@redhat.com
---
fs/afs/file.c | 6 ++++
fs/afs/inode.c | 8 +++--
fs/afs/internal.h | 5 +++
fs/afs/super.c | 1 +
fs/afs/write.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++-------
5 files changed, 84 insertions(+), 14 deletions(-)
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 43424af240ab..c0cf8bfa00e8 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -402,6 +402,12 @@ static void afs_readahead(struct readahead_control *ractl)
netfs_readahead(ractl, &afs_req_ops, NULL);
}
+int afs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ fscache_unpin_writeback(wbc, afs_vnode_cache(AFS_FS_I(inode)));
+ return 0;
+}
+
/*
* Adjust the dirty region of the page on truncation or full invalidation,
* getting rid of the markers altogether if the region is entirely invalidated.
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index be5ca9bf49ae..c4af4fda37dd 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -761,9 +761,8 @@ int afs_drop_inode(struct inode *inode)
*/
void afs_evict_inode(struct inode *inode)
{
- struct afs_vnode *vnode;
-
- vnode = AFS_FS_I(inode);
+ struct afs_vnode_cache_aux aux;
+ struct afs_vnode *vnode = AFS_FS_I(inode);
_enter("{%llx:%llu.%d}",
vnode->fid.vid,
@@ -775,6 +774,9 @@ void afs_evict_inode(struct inode *inode)
ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
truncate_inode_pages_final(&inode->i_data);
+
+ afs_set_cache_aux(vnode, &aux);
+ fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux);
clear_inode(inode);
while (!list_empty(&vnode->wb_keys)) {
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 6c591b7c55f1..07d34291bf4f 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1072,6 +1072,7 @@ extern int afs_release(struct inode *, struct file *);
extern int afs_fetch_data(struct afs_vnode *, struct afs_read *);
extern struct afs_read *afs_alloc_read(gfp_t);
extern void afs_put_read(struct afs_read *);
+extern int afs_write_inode(struct inode *, struct writeback_control *);
static inline struct afs_read *afs_get_read(struct afs_read *req)
{
@@ -1519,7 +1520,11 @@ extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);
/*
* write.c
*/
+#ifdef CONFIG_AFS_FSCACHE
extern int afs_set_page_dirty(struct page *);
+#else
+#define afs_set_page_dirty __set_page_dirty_nobuffers
+#endif
extern int afs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata);
diff --git a/fs/afs/super.c b/fs/afs/super.c
index d110def8aa8e..af7cbd9949c5 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -55,6 +55,7 @@ int afs_net_id;
static const struct super_operations afs_super_ops = {
.statfs = afs_statfs,
.alloc_inode = afs_alloc_inode,
+ .write_inode = afs_write_inode,
.drop_inode = afs_drop_inode,
.destroy_inode = afs_destroy_inode,
.free_inode = afs_free_inode,
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 55c5c963d42d..fa96a65d28be 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -14,14 +14,27 @@
#include <linux/netfs.h>
#include "internal.h"
+static void afs_write_to_cache(struct afs_vnode *vnode, loff_t start, size_t len,
+ loff_t i_size);
+
+#ifdef CONFIG_AFS_FSCACHE
/*
- * mark a page as having been made dirty and thus needing writeback
+ * Mark a page as having been made dirty and thus needing writeback. We also
+ * need to pin the cache object to write back to.
*/
int afs_set_page_dirty(struct page *page)
{
- _enter("");
- return __set_page_dirty_nobuffers(page);
+ return fscache_set_page_dirty(page, afs_vnode_cache(AFS_FS_I(page->mapping->host)));
+}
+static void afs_set_page_fscache(struct page *page)
+{
+ set_page_fscache(page);
+}
+#else
+static void afs_set_page_fscache(struct page *page)
+{
}
+#endif
/*
* Prepare to perform part of a write to a page. Note that len may extend
@@ -114,7 +127,7 @@ int afs_write_end(struct file *file, struct address_space *mapping,
unsigned long priv;
unsigned int f, from = offset_in_thp(page, pos);
unsigned int t, to = from + copied;
- loff_t i_size, maybe_i_size;
+ loff_t i_size, write_end_pos;
_enter("{%llx:%llu},{%lx}",
vnode->fid.vid, vnode->fid.vnode, page->index);
@@ -132,15 +145,16 @@ int afs_write_end(struct file *file, struct address_space *mapping,
if (copied == 0)
goto out;
- maybe_i_size = pos + copied;
+ write_end_pos = pos + copied;
i_size = i_size_read(&vnode->vfs_inode);
- if (maybe_i_size > i_size) {
+ if (write_end_pos > i_size) {
write_seqlock(&vnode->cb_lock);
i_size = i_size_read(&vnode->vfs_inode);
- if (maybe_i_size > i_size)
- afs_set_i_size(vnode, maybe_i_size);
+ if (write_end_pos > i_size)
+ afs_set_i_size(vnode, write_end_pos);
write_sequnlock(&vnode->cb_lock);
+ fscache_update_cookie(afs_vnode_cache(vnode), NULL, &write_end_pos);
}
if (PagePrivate(page)) {
@@ -482,7 +496,8 @@ static void afs_extend_writeback(struct address_space *mapping,
put_page(page);
break;
}
- if (!PageDirty(page) || PageWriteback(page)) {
+ if (!PageDirty(page) || PageWriteback(page) ||
+ PageFsCache(page)) {
unlock_page(page);
put_page(page);
break;
@@ -530,6 +545,7 @@ static void afs_extend_writeback(struct address_space *mapping,
BUG();
if (test_set_page_writeback(page))
BUG();
+ afs_set_page_fscache(page);
*_count -= thp_nr_pages(page);
unlock_page(page);
@@ -564,6 +580,7 @@ static ssize_t afs_write_back_from_locked_page(struct address_space *mapping,
if (test_set_page_writeback(page))
BUG();
+ afs_set_page_fscache(page);
count -= thp_nr_pages(page);
@@ -603,12 +620,19 @@ static ssize_t afs_write_back_from_locked_page(struct address_space *mapping,
if (start < i_size) {
_debug("write back %x @%llx [%llx]", len, start, i_size);
+ /* Speculatively write to the cache. We have to fix this up
+ * later if the store fails.
+ */
+ afs_write_to_cache(vnode, start, len, i_size);
+
iov_iter_xarray(&iter, WRITE, &mapping->i_pages, start, len);
ret = afs_store_data(vnode, &iter, start, false);
} else {
_debug("write discard %x @%llx [%llx]", len, start, i_size);
/* The dirty region was entirely beyond the EOF. */
+ fscache_clear_page_bits(afs_vnode_cache(vnode),
+ mapping, start, len);
afs_pages_written_back(vnode, start, len);
ret = 0;
}
@@ -666,6 +690,10 @@ int afs_writepage(struct page *page, struct writeback_control *wbc)
_enter("{%lx},", page->index);
+#ifdef CONFIG_AFS_FSCACHE
+ wait_on_page_fscache(page);
+#endif
+
start = page->index * PAGE_SIZE;
ret = afs_write_back_from_locked_page(page->mapping, wbc, page,
start, LLONG_MAX - start);
@@ -728,10 +756,14 @@ static int afs_writepages_region(struct address_space *mapping,
continue;
}
- if (PageWriteback(page)) {
+ if (PageWriteback(page) || PageFsCache(page)) {
unlock_page(page);
- if (wbc->sync_mode != WB_SYNC_NONE)
+ if (wbc->sync_mode != WB_SYNC_NONE) {
wait_on_page_writeback(page);
+#ifdef CONFIG_AFS_FSCACHE
+ wait_on_page_fscache(page);
+#endif
+ }
put_page(page);
continue;
}
@@ -984,3 +1016,27 @@ int afs_launder_page(struct page *page)
wait_on_page_fscache(page);
return ret;
}
+
+/*
+ * Deal with the completion of writing the data to the cache.
+ */
+static void afs_write_to_cache_done(void *priv, ssize_t transferred_or_error,
+ bool was_async)
+{
+ struct afs_vnode *vnode = priv;
+
+ if (IS_ERR_VALUE(transferred_or_error) &&
+ transferred_or_error != -ENOBUFS)
+ afs_invalidate_cache(vnode, 0);
+}
+
+/*
+ * Save the write to the cache also.
+ */
+static void afs_write_to_cache(struct afs_vnode *vnode,
+ loff_t start, size_t len, loff_t i_size)
+{
+ fscache_write_to_cache(afs_vnode_cache(vnode),
+ vnode->vfs_inode.i_mapping, start, len, i_size,
+ afs_write_to_cache_done, vnode);
+}
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 46/53] afs: Skip truncation on the server of data we haven't written yet
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (44 preceding siblings ...)
2021-10-22 19:09 ` [PATCH v2 45/53] afs: Copy local writes to the cache when writing to the server David Howells
@ 2021-10-22 19:09 ` David Howells
2021-10-22 19:09 ` [PATCH v2 47/53] afs: Add synchronous O_DIRECT support David Howells
` (8 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:09 UTC (permalink / raw)
To: linux-cachefs
Cc: Marc Dionne, linux-afs, dhowells, Trond Myklebust,
Anna Schumaker, Steve French, Dominique Martinet, Jeff Layton,
Matthew Wilcox, Alexander Viro, Omar Sandoval, Linus Torvalds,
linux-afs, linux-nfs, linux-cifs, ceph-devel, v9fs-developer,
linux-fsdevel, linux-kernel
Don't send a truncation RPC to the server if we're only shortening data
that's in the pagecache and is beyond the server's EOF.
Also don't automatically force writeback on setattr, but do wait to store
RPCs that are in the region to be removed on a shortening truncation.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
---
fs/afs/inode.c | 45 +++++++++++++++++++++++++++++++++++----------
1 file changed, 35 insertions(+), 10 deletions(-)
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index c4af4fda37dd..4c66a2b86add 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -848,42 +848,67 @@ static const struct afs_operation_ops afs_setattr_operation = {
int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
struct iattr *attr)
{
+ const unsigned int supported =
+ ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
+ ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
struct afs_operation *op;
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+ struct inode *inode = &vnode->vfs_inode;
+ loff_t i_size;
int ret;
_enter("{%llx:%llu},{n=%pd},%x",
vnode->fid.vid, vnode->fid.vnode, dentry,
attr->ia_valid);
- if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
- ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET |
- ATTR_TOUCH))) {
+ if (!(attr->ia_valid & supported)) {
_leave(" = 0 [unsupported]");
return 0;
}
+ i_size = i_size_read(inode);
if (attr->ia_valid & ATTR_SIZE) {
- if (!S_ISREG(vnode->vfs_inode.i_mode))
+ if (!S_ISREG(inode->i_mode))
return -EISDIR;
- ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size);
+ ret = inode_newsize_ok(inode, attr->ia_size);
if (ret)
return ret;
- if (attr->ia_size == i_size_read(&vnode->vfs_inode))
+ if (attr->ia_size == i_size)
attr->ia_valid &= ~ATTR_SIZE;
}
fscache_use_cookie(afs_vnode_cache(vnode), true);
- /* flush any dirty data outstanding on a regular file */
- if (S_ISREG(vnode->vfs_inode.i_mode))
- filemap_write_and_wait(vnode->vfs_inode.i_mapping);
-
/* Prevent any new writebacks from starting whilst we do this. */
down_write(&vnode->validate_lock);
+ if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
+ loff_t size = attr->ia_size;
+
+ /* Wait for any outstanding writes to the server to complete */
+ loff_t from = min(size, i_size);
+ loff_t to = max(size, i_size);
+ ret = filemap_fdatawait_range(inode->i_mapping, from, to);
+ if (ret < 0)
+ goto out_unlock;
+
+ /* Don't talk to the server if we're just shortening in-memory
+ * writes that haven't gone to the server yet.
+ */
+ if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
+ attr->ia_size < i_size &&
+ attr->ia_size > vnode->status.size) {
+ truncate_pagecache(inode, attr->ia_size);
+ fscache_resize_cookie(afs_vnode_cache(vnode),
+ attr->ia_size);
+ i_size_write(inode, attr->ia_size);
+ ret = 0;
+ goto out_unlock;
+ }
+ }
+
op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
afs_file_key(attr->ia_file) : NULL),
vnode->volume);
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 47/53] afs: Add synchronous O_DIRECT support
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (45 preceding siblings ...)
2021-10-22 19:09 ` [PATCH v2 46/53] afs: Skip truncation on the server of data we haven't written yet David Howells
@ 2021-10-22 19:09 ` David Howells
2021-10-22 19:09 ` [PATCH v2 48/53] 9p: Use fscache indexing rewrite and reenable caching David Howells
` (7 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:09 UTC (permalink / raw)
To: linux-cachefs
Cc: Marc Dionne, linux-afs, dhowells, Trond Myklebust,
Anna Schumaker, Steve French, Dominique Martinet, Jeff Layton,
Matthew Wilcox, Alexander Viro, Omar Sandoval, Linus Torvalds,
linux-afs, linux-nfs, linux-cifs, ceph-devel, v9fs-developer,
linux-fsdevel, linux-kernel
Add synchronous O_DIRECT support to AFS (no AIO yet). It can theoretically
handle reads and writes up to the maximum size describable by an s64 - and
given an iterator with sufficiently capacity to handle that and given
support on the server.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-cachefs@redhat.com
---
fs/afs/file.c | 59 +++++++++++++++++++++++++++++++++++++++++++
fs/afs/fsclient.c | 2 +
fs/afs/internal.h | 1 +
fs/afs/write.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 133 insertions(+), 1 deletion(-)
diff --git a/fs/afs/file.c b/fs/afs/file.c
index c0cf8bfa00e8..7fe57f210259 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -28,6 +28,7 @@ static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter);
static void afs_vm_open(struct vm_area_struct *area);
static void afs_vm_close(struct vm_area_struct *area);
static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff);
+static ssize_t afs_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
const struct file_operations afs_file_operations = {
.open = afs_open,
@@ -56,6 +57,7 @@ const struct address_space_operations afs_fs_aops = {
.launder_page = afs_launder_page,
.releasepage = afs_releasepage,
.invalidatepage = afs_invalidatepage,
+ .direct_IO = afs_direct_IO,
.write_begin = afs_write_begin,
.write_end = afs_write_end,
.writepage = afs_writepage,
@@ -602,3 +604,60 @@ static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
return generic_file_read_iter(iocb, iter);
}
+
+/*
+ * Direct file read operation for an AFS file.
+ *
+ * TODO: To support AIO, the pages in the iterator have to be copied and
+ * refs taken on them. Then -EIOCBQUEUED needs to be returned.
+ * iocb->ki_complete must then be called upon completion of the operation.
+ */
+static ssize_t afs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter)
+{
+ struct file *file = iocb->ki_filp;
+ struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
+ struct afs_read *req;
+ ssize_t ret, transferred;
+
+ _enter("%llx,%zx", iocb->ki_pos, iov_iter_count(iter));
+
+ req = afs_alloc_read(GFP_KERNEL);
+ if (!req)
+ return -ENOMEM;
+
+ req->vnode = vnode;
+ req->key = key_get(afs_file_key(file));
+ req->pos = iocb->ki_pos;
+ req->len = iov_iter_count(iter);
+ req->iter = iter;
+
+ task_io_account_read(req->len);
+
+ // TODO nfs_start_io_direct(inode);
+ ret = afs_fetch_data(vnode, req);
+ if (ret == 0)
+ transferred = req->actual_len;
+ afs_put_read(req);
+
+ // TODO nfs_end_io_direct(inode);
+
+ if (ret == 0)
+ ret = transferred;
+
+ BUG_ON(ret == -EIOCBQUEUED); // TODO
+ //if (iocb->ki_complete)
+ // iocb->ki_complete(iocb, ret, 0); // only if ret == -EIOCBQUEUED
+
+ _leave(" = %zu", ret);
+ return ret;
+}
+
+/*
+ * Do direct I/O.
+ */
+static ssize_t afs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
+{
+ if (iov_iter_rw(iter) == READ)
+ return afs_file_direct_read(iocb, iter);
+ return afs_file_direct_write(iocb, iter);
+}
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 4943413d9c5f..a7273106803c 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -439,7 +439,7 @@ static void afs_fs_fetch_data64(struct afs_operation *op)
bp[3] = htonl(vp->fid.unique);
bp[4] = htonl(upper_32_bits(req->pos));
bp[5] = htonl(lower_32_bits(req->pos));
- bp[6] = 0;
+ bp[6] = htonl(upper_32_bits(req->len));
bp[7] = htonl(lower_32_bits(req->len));
trace_afs_make_fs_call(call, &vp->fid);
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 07d34291bf4f..3d640e84588e 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1538,6 +1538,7 @@ extern int afs_fsync(struct file *, loff_t, loff_t, int);
extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
extern void afs_prune_wb_keys(struct afs_vnode *);
extern int afs_launder_page(struct page *);
+extern ssize_t afs_file_direct_write(struct kiocb *, struct iov_iter *);
/*
* xattr.c
diff --git a/fs/afs/write.c b/fs/afs/write.c
index fa96a65d28be..94a21ee974c0 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -1040,3 +1040,75 @@ static void afs_write_to_cache(struct afs_vnode *vnode,
vnode->vfs_inode.i_mapping, start, len, i_size,
afs_write_to_cache_done, vnode);
}
+
+static void afs_dio_store_data_success(struct afs_operation *op)
+{
+ struct afs_vnode *vnode = op->file[0].vnode;
+
+ op->ctime = op->file[0].scb.status.mtime_client;
+ afs_vnode_commit_status(op, &op->file[0]);
+ if (op->error == 0) {
+ afs_stat_v(vnode, n_stores);
+ atomic_long_add(op->store.size, &afs_v2net(vnode)->n_store_bytes);
+ }
+}
+
+static const struct afs_operation_ops afs_dio_store_data_operation = {
+ .issue_afs_rpc = afs_fs_store_data,
+ .issue_yfs_rpc = yfs_fs_store_data,
+ .success = afs_dio_store_data_success,
+};
+
+/*
+ * Direct file write operation for an AFS file.
+ *
+ * TODO: To support AIO, the pages in the iterator have to be copied and
+ * refs taken on them. Then -EIOCBQUEUED needs to be returned.
+ * iocb->ki_complete must then be called upon completion of the operation.
+ */
+ssize_t afs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
+{
+ struct file *file = iocb->ki_filp;
+ struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
+ struct afs_operation *op;
+ loff_t size = iov_iter_count(iter), i_size;
+ ssize_t ret;
+
+ _enter("%s{%llx:%llu.%u},%llx,%llx",
+ vnode->volume->name,
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ size, iocb->ki_pos);
+
+ op = afs_alloc_operation(afs_file_key(file), vnode->volume);
+ if (IS_ERR(op))
+ return -ENOMEM;
+
+ i_size = i_size_read(&vnode->vfs_inode);
+
+ afs_op_set_vnode(op, 0, vnode);
+ op->file[0].dv_delta = 1;
+ op->file[0].set_size = true;
+ op->file[0].modification = true;
+ op->store.write_iter = iter;
+ op->store.pos = iocb->ki_pos;
+ op->store.size = size;
+ op->store.i_size = max(iocb->ki_pos + size, i_size);
+ op->mtime = current_time(&vnode->vfs_inode);
+ op->ops = &afs_dio_store_data_operation;
+
+ //if (!is_sync_kiocb(iocb)) {
+
+ ret = afs_do_sync_operation(op);
+ if (ret == 0)
+ ret = size;
+
+ afs_invalidate_cache(vnode, FSCACHE_INVAL_DIO_WRITE);
+
+ //if (iocb->ki_complete)
+ // iocb->ki_complete(iocb, ret, 0); // only if ret == -EIOCBQUEUED
+
+ _leave(" = %zd", ret);
+ return ret;
+}
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 48/53] 9p: Use fscache indexing rewrite and reenable caching
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (46 preceding siblings ...)
2021-10-22 19:09 ` [PATCH v2 47/53] afs: Add synchronous O_DIRECT support David Howells
@ 2021-10-22 19:09 ` David Howells
2021-10-22 19:10 ` [PATCH v2 49/53] 9p: Copy local writes to the cache when writing to the server David Howells
` (6 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:09 UTC (permalink / raw)
To: linux-cachefs
Cc: Eric Van Hensbergen, Latchesar Ionkov, Dominique Martinet,
v9fs-developer, dhowells, Trond Myklebust, Anna Schumaker,
Steve French, Dominique Martinet, Jeff Layton, Matthew Wilcox,
Alexander Viro, Omar Sandoval, Linus Torvalds, linux-afs,
linux-nfs, linux-cifs, ceph-devel, v9fs-developer, linux-fsdevel,
linux-kernel
Change the 9p filesystem to take account of the changes to fscache's
indexing rewrite and reenable caching in 9p.
The following changes have been made:
(1) The fscache_netfs struct is no more, and there's no need to register
the filesystem as a whole.
(2) The session cookie is now an fscache_volume cookie, allocated with
fscache_acquire_volume(). That takes three parameters: a string
representing the "volume" in the index, a string naming the cache to
use (or NULL) and a u64 that conveys coherency metadata for the
volume.
For 9p, I've made it render the volume name string as:
"9p,<devname>,<cachetag>"
where the cachetag is replaced by the aname if it wasn't supplied.
This probably needs rethinking a bit as the aname can have slashes in
it. It might be better to hash the cachetag and use the hash or I
could substitute commas for the slashes or something.
(3) The fscache_cookie_def is no more and needed information is passed
directly to fscache_acquire_cookie(). The cache no longer calls back
into the filesystem, but rather metadata changes are indicated at
other times.
fscache_acquire_cookie() is passed the same keying and coherency
information as before.
(4) The functions to set/reset/flush cookies are removed and
fscache_use_cookie() and fscache_unuse_cookie() are used instead.
fscache_use_cookie() is passed a flag to indicate if the cookie is
opened for writing. fscache_unuse_cookie() is passed updates for the
metadata if we changed it (ie. if the file was opened for writing).
These are called when the file is opened or closed.
(5) wait_on_page_bit[_killable]() is replaced with the specific wait
functions for the bits waited upon.
(6) I've got rid of some of the 9p-specific cache helper functions and
called things like fscache_relinquish_cookie() directly as they'll
optimise away if v9fs_inode_cookie() returns an unconditional NULL
(which will be the case if CONFIG_9P_FSCACHE=n).
(7) v9fs_vfs_setattr() is made to call fscache_resize() to change the size
of the cache object.
Notes:
(A) We should call fscache_invalidate() if we detect that the server's
copy of a file got changed by a third party, but I don't know where to
do that. We don't need to do that when allocating the cookie as we
get a check-and-invalidate when we initially bind to the cache object.
(B) The copy-to-cache-on-writeback side of things will be handled in
separate patch.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Eric Van Hensbergen <ericvh@gmail.com>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: v9fs-developer@lists.sourceforge.net
cc: linux-cachefs@redhat.com
---
fs/9p/Kconfig | 2 -
fs/9p/cache.c | 184 ++++++------------------------------------------
fs/9p/cache.h | 25 +------
fs/9p/v9fs.c | 14 +---
fs/9p/v9fs.h | 13 +++
fs/9p/vfs_addr.c | 2 -
fs/9p/vfs_dir.c | 11 +++
fs/9p/vfs_file.c | 7 +-
fs/9p/vfs_inode.c | 22 +++---
fs/9p/vfs_inode_dotl.c | 3 +
10 files changed, 72 insertions(+), 211 deletions(-)
diff --git a/fs/9p/Kconfig b/fs/9p/Kconfig
index b11c15c30bac..d7bc93447c85 100644
--- a/fs/9p/Kconfig
+++ b/fs/9p/Kconfig
@@ -14,7 +14,7 @@ config 9P_FS
if 9P_FS
config 9P_FSCACHE
bool "Enable 9P client caching support"
- depends on 9P_FS=m && FSCACHE_OLD || 9P_FS=y && FSCACHE_OLD=y
+ depends on 9P_FS=m && FSCACHE || 9P_FS=y && FSCACHE=y
help
Choose Y here to enable persistent, read-only local
caching support for 9p clients using FS-Cache
diff --git a/fs/9p/cache.c b/fs/9p/cache.c
index 077f0a40aa01..99662920699d 100644
--- a/fs/9p/cache.c
+++ b/fs/9p/cache.c
@@ -16,89 +16,26 @@
#include "v9fs.h"
#include "cache.h"
-#define CACHETAG_LEN 11
-
-struct fscache_netfs v9fs_cache_netfs = {
- .name = "9p",
- .version = 0,
-};
-
-/*
- * v9fs_random_cachetag - Generate a random tag to be associated
- * with a new cache session.
- *
- * The value of jiffies is used for a fairly randomly cache tag.
- */
-
-static
-int v9fs_random_cachetag(struct v9fs_session_info *v9ses)
-{
- v9ses->cachetag = kmalloc(CACHETAG_LEN, GFP_KERNEL);
- if (!v9ses->cachetag)
- return -ENOMEM;
-
- return scnprintf(v9ses->cachetag, CACHETAG_LEN, "%lu", jiffies);
-}
-
-const struct fscache_cookie_def v9fs_cache_session_index_def = {
- .name = "9P.session",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-
-void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses)
+void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
+ const char *dev_name)
{
- /* If no cache session tag was specified, we generate a random one. */
- if (!v9ses->cachetag) {
- if (v9fs_random_cachetag(v9ses) < 0) {
- v9ses->fscache = NULL;
- kfree(v9ses->cachetag);
- v9ses->cachetag = NULL;
- return;
- }
- }
+ char *name, *p;
- v9ses->fscache = fscache_acquire_cookie(v9fs_cache_netfs.primary_index,
- &v9fs_cache_session_index_def,
- v9ses->cachetag,
- strlen(v9ses->cachetag),
- NULL, 0,
- v9ses, 0, true);
- p9_debug(P9_DEBUG_FSC, "session %p get cookie %p\n",
- v9ses, v9ses->fscache);
-}
-
-void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses)
-{
- p9_debug(P9_DEBUG_FSC, "session %p put cookie %p\n",
- v9ses, v9ses->fscache);
- fscache_relinquish_cookie(v9ses->fscache, NULL, false);
- v9ses->fscache = NULL;
-}
-
-static enum
-fscache_checkaux v9fs_cache_inode_check_aux(void *cookie_netfs_data,
- const void *buffer,
- uint16_t buflen,
- loff_t object_size)
-{
- const struct v9fs_inode *v9inode = cookie_netfs_data;
-
- if (buflen != sizeof(v9inode->qid.version))
- return FSCACHE_CHECKAUX_OBSOLETE;
+ name = kasprintf(GFP_KERNEL, "9p,%s,%s",
+ dev_name, v9ses->cachetag ?: v9ses->aname);
+ if (!name)
+ return;
- if (memcmp(buffer, &v9inode->qid.version,
- sizeof(v9inode->qid.version)))
- return FSCACHE_CHECKAUX_OBSOLETE;
+ for (p = name; *p; p++)
+ if (*p == '/')
+ *p = ';';
- return FSCACHE_CHECKAUX_OKAY;
+ v9ses->fscache = fscache_acquire_volume(name, NULL, 0);
+ p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n",
+ v9ses, v9ses->fscache, name);
+ kfree(name);
}
-const struct fscache_cookie_def v9fs_cache_inode_index_def = {
- .name = "9p.inode",
- .type = FSCACHE_COOKIE_TYPE_DATAFILE,
- .check_aux = v9fs_cache_inode_check_aux,
-};
-
void v9fs_cache_inode_get_cookie(struct inode *inode)
{
struct v9fs_inode *v9inode;
@@ -108,94 +45,19 @@ void v9fs_cache_inode_get_cookie(struct inode *inode)
return;
v9inode = V9FS_I(inode);
- if (v9inode->fscache)
+ if (WARN_ON(v9inode->fscache))
return;
v9ses = v9fs_inode2v9ses(inode);
- v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
- &v9fs_cache_inode_index_def,
- &v9inode->qid.path,
- sizeof(v9inode->qid.path),
- &v9inode->qid.version,
- sizeof(v9inode->qid.version),
- v9inode,
- i_size_read(&v9inode->vfs_inode),
- true);
+ v9inode->fscache =
+ fscache_acquire_cookie(v9fs_session_cache(v9ses),
+ 0,
+ &v9inode->qid.path,
+ sizeof(v9inode->qid.path),
+ &v9inode->qid.version,
+ sizeof(v9inode->qid.version),
+ i_size_read(&v9inode->vfs_inode));
p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
inode, v9inode->fscache);
}
-
-void v9fs_cache_inode_put_cookie(struct inode *inode)
-{
- struct v9fs_inode *v9inode = V9FS_I(inode);
-
- if (!v9inode->fscache)
- return;
- p9_debug(P9_DEBUG_FSC, "inode %p put cookie %p\n",
- inode, v9inode->fscache);
-
- fscache_relinquish_cookie(v9inode->fscache, &v9inode->qid.version,
- false);
- v9inode->fscache = NULL;
-}
-
-void v9fs_cache_inode_flush_cookie(struct inode *inode)
-{
- struct v9fs_inode *v9inode = V9FS_I(inode);
-
- if (!v9inode->fscache)
- return;
- p9_debug(P9_DEBUG_FSC, "inode %p flush cookie %p\n",
- inode, v9inode->fscache);
-
- fscache_relinquish_cookie(v9inode->fscache, NULL, true);
- v9inode->fscache = NULL;
-}
-
-void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp)
-{
- struct v9fs_inode *v9inode = V9FS_I(inode);
-
- if (!v9inode->fscache)
- return;
-
- mutex_lock(&v9inode->fscache_lock);
-
- if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
- v9fs_cache_inode_flush_cookie(inode);
- else
- v9fs_cache_inode_get_cookie(inode);
-
- mutex_unlock(&v9inode->fscache_lock);
-}
-
-void v9fs_cache_inode_reset_cookie(struct inode *inode)
-{
- struct v9fs_inode *v9inode = V9FS_I(inode);
- struct v9fs_session_info *v9ses;
- struct fscache_cookie *old;
-
- if (!v9inode->fscache)
- return;
-
- old = v9inode->fscache;
-
- mutex_lock(&v9inode->fscache_lock);
- fscache_relinquish_cookie(v9inode->fscache, NULL, true);
-
- v9ses = v9fs_inode2v9ses(inode);
- v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
- &v9fs_cache_inode_index_def,
- &v9inode->qid.path,
- sizeof(v9inode->qid.path),
- &v9inode->qid.version,
- sizeof(v9inode->qid.version),
- v9inode,
- i_size_read(&v9inode->vfs_inode),
- true);
- p9_debug(P9_DEBUG_FSC, "inode %p revalidating cookie old %p new %p\n",
- inode, old, v9inode->fscache);
-
- mutex_unlock(&v9inode->fscache_lock);
-}
diff --git a/fs/9p/cache.h b/fs/9p/cache.h
index b940c5ffd9e3..e485049eec85 100644
--- a/fs/9p/cache.h
+++ b/fs/9p/cache.h
@@ -9,25 +9,14 @@
#define _9P_CACHE_H
#define FSCACHE_USE_NEW_IO_API
-#include <linux/fscache_old.h>
+#include <linux/fscache.h>
#ifdef CONFIG_9P_FSCACHE
-extern struct fscache_netfs v9fs_cache_netfs;
-extern const struct fscache_cookie_def v9fs_cache_session_index_def;
-extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
-
-extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
-extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
+extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses,
+ const char *dev_name);
extern void v9fs_cache_inode_get_cookie(struct inode *inode);
-extern void v9fs_cache_inode_put_cookie(struct inode *inode);
-extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
-extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
-extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
-
-extern int __v9fs_cache_register(void);
-extern void __v9fs_cache_unregister(void);
#else /* CONFIG_9P_FSCACHE */
@@ -35,13 +24,5 @@ static inline void v9fs_cache_inode_get_cookie(struct inode *inode)
{
}
-static inline void v9fs_cache_inode_put_cookie(struct inode *inode)
-{
-}
-
-static inline void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *file)
-{
-}
-
#endif /* CONFIG_9P_FSCACHE */
#endif /* _9P_CACHE_H */
diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 2e0fa7c932db..ab5b2069b78d 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -468,7 +468,8 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
#ifdef CONFIG_9P_FSCACHE
/* register the session for caching */
- v9fs_cache_session_get_cookie(v9ses);
+ if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
+ v9fs_cache_session_get_cookie(v9ses, dev_name);
#endif
spin_lock(&v9fs_sessionlist_lock);
list_add(&v9ses->slist, &v9fs_sessionlist);
@@ -501,8 +502,7 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
}
#ifdef CONFIG_9P_FSCACHE
- if (v9ses->fscache)
- v9fs_cache_session_put_cookie(v9ses);
+ fscache_relinquish_volume(v9fs_session_cache(v9ses), 0, false);
kfree(v9ses->cachetag);
#endif
kfree(v9ses->uname);
@@ -662,20 +662,12 @@ static int v9fs_cache_register(void)
ret = v9fs_init_inode_cache();
if (ret < 0)
return ret;
-#ifdef CONFIG_9P_FSCACHE
- ret = fscache_register_netfs(&v9fs_cache_netfs);
- if (ret < 0)
- v9fs_destroy_inode_cache();
-#endif
return ret;
}
static void v9fs_cache_unregister(void)
{
v9fs_destroy_inode_cache();
-#ifdef CONFIG_9P_FSCACHE
- fscache_unregister_netfs(&v9fs_cache_netfs);
-#endif
}
/**
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 92124b235a6d..cf4f645785e0 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -89,7 +89,7 @@ struct v9fs_session_info {
unsigned int cache;
#ifdef CONFIG_9P_FSCACHE
char *cachetag;
- struct fscache_cookie *fscache;
+ struct fscache_volume *fscache;
#endif
char *uname; /* user name to mount as */
@@ -109,7 +109,6 @@ struct v9fs_session_info {
struct v9fs_inode {
#ifdef CONFIG_9P_FSCACHE
- struct mutex fscache_lock;
struct fscache_cookie *fscache;
#endif
struct p9_qid qid;
@@ -133,6 +132,16 @@ static inline struct fscache_cookie *v9fs_inode_cookie(struct v9fs_inode *v9inod
#endif
}
+static inline struct fscache_volume *v9fs_session_cache(struct v9fs_session_info *v9ses)
+{
+#ifdef CONFIG_9P_FSCACHE
+ return v9ses->fscache;
+#else
+ return NULL;
+#endif
+}
+
+
extern int v9fs_show_options(struct seq_file *m, struct dentry *root);
struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index cff99f5c05e3..5bcc2ab5b277 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -80,7 +80,7 @@ static bool v9fs_is_cache_enabled(struct inode *inode)
{
struct fscache_cookie *cookie = v9fs_inode_cookie(V9FS_I(inode));
- return fscache_cookie_enabled(cookie) && !hlist_empty(&cookie->backing_objects);
+ return fscache_cookie_enabled(cookie) && cookie->cache_priv;
}
/**
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index b6a5a0be444d..676b8b00ef20 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -19,6 +19,7 @@
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/uio.h>
+#include <linux/fscache.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
@@ -205,7 +206,9 @@ static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx)
int v9fs_dir_release(struct inode *inode, struct file *filp)
{
+ struct v9fs_inode *v9inode = V9FS_I(inode);
struct p9_fid *fid;
+ loff_t i_size;
fid = filp->private_data;
p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n",
@@ -216,6 +219,14 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
spin_unlock(&inode->i_lock);
p9_client_clunk(fid);
}
+
+ if ((filp->f_mode & FMODE_WRITE)) {
+ i_size = i_size_read(inode);
+ fscache_unuse_cookie(v9fs_inode_cookie(v9inode),
+ &v9inode->qid.version, &i_size);
+ } else {
+ fscache_unuse_cookie(v9fs_inode_cookie(v9inode), NULL, NULL);
+ }
return 0;
}
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 80052497f00f..461a51509300 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -95,7 +95,8 @@ int v9fs_file_open(struct inode *inode, struct file *file)
}
mutex_unlock(&v9inode->v_mutex);
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
- v9fs_cache_inode_set_cookie(inode, file);
+ fscache_use_cookie(v9fs_inode_cookie(v9inode),
+ file->f_mode & FMODE_WRITE);
v9fs_open_fid_add(inode, fid);
return 0;
out_error:
@@ -544,12 +545,12 @@ v9fs_vm_page_mkwrite(struct vm_fault *vmf)
*/
#ifdef CONFIG_9P_FSCACHE
if (PageFsCache(page) &&
- wait_on_page_bit_killable(page, PG_fscache) < 0)
+ wait_on_page_fscache_killable(page) < 0)
return VM_FAULT_RETRY;
#endif
if (PageWriteback(page) &&
- wait_on_page_bit_killable(page, PG_writeback) < 0)
+ wait_on_page_writeback_killable(page) < 0)
return VM_FAULT_RETRY;
/* Update file times before taking page lock */
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 08f48b70a741..83db37bd4252 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -228,7 +228,6 @@ struct inode *v9fs_alloc_inode(struct super_block *sb)
return NULL;
#ifdef CONFIG_9P_FSCACHE
v9inode->fscache = NULL;
- mutex_init(&v9inode->fscache_lock);
#endif
v9inode->writeback_fid = NULL;
v9inode->cache_validity = 0;
@@ -381,7 +380,7 @@ void v9fs_evict_inode(struct inode *inode)
clear_inode(inode);
filemap_fdatawrite(&inode->i_data);
- v9fs_cache_inode_put_cookie(inode);
+ fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
/* clunk the fid stashed in writeback_fid */
if (v9inode->writeback_fid) {
p9_client_clunk(v9inode->writeback_fid);
@@ -862,7 +861,8 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
file->private_data = fid;
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
- v9fs_cache_inode_set_cookie(d_inode(dentry), file);
+ fscache_use_cookie(v9fs_inode_cookie(v9inode),
+ file->f_mode & FMODE_WRITE);
v9fs_open_fid_add(inode, fid);
file->f_mode |= FMODE_CREATED;
@@ -1065,6 +1065,8 @@ static int v9fs_vfs_setattr(struct user_namespace *mnt_userns,
struct dentry *dentry, struct iattr *iattr)
{
int retval, use_dentry = 0;
+ struct inode *inode = d_inode(dentry);
+ struct v9fs_inode *v9inode = V9FS_I(inode);
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL;
struct p9_wstat wstat;
@@ -1110,7 +1112,7 @@ static int v9fs_vfs_setattr(struct user_namespace *mnt_userns,
/* Write all dirty data */
if (d_is_reg(dentry))
- filemap_write_and_wait(d_inode(dentry)->i_mapping);
+ filemap_write_and_wait(inode->i_mapping);
retval = p9_client_wstat(fid, &wstat);
@@ -1121,13 +1123,15 @@ static int v9fs_vfs_setattr(struct user_namespace *mnt_userns,
return retval;
if ((iattr->ia_valid & ATTR_SIZE) &&
- iattr->ia_size != i_size_read(d_inode(dentry)))
- truncate_setsize(d_inode(dentry), iattr->ia_size);
+ iattr->ia_size != i_size_read(inode)) {
+ truncate_setsize(inode, iattr->ia_size);
+ fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
+ }
- v9fs_invalidate_inode_attr(d_inode(dentry));
+ v9fs_invalidate_inode_attr(inode);
- setattr_copy(&init_user_ns, d_inode(dentry), iattr);
- mark_inode_dirty(d_inode(dentry));
+ setattr_copy(&init_user_ns, inode, iattr);
+ mark_inode_dirty(inode);
return 0;
}
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 01b9e1281a29..a5058c9a2ab3 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -346,7 +346,8 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
goto err_clunk_old_fid;
file->private_data = ofid;
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
- v9fs_cache_inode_set_cookie(inode, file);
+ fscache_use_cookie(v9fs_inode_cookie(v9inode),
+ file->f_mode & FMODE_WRITE);
v9fs_open_fid_add(inode, ofid);
file->f_mode |= FMODE_CREATED;
out:
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 49/53] 9p: Copy local writes to the cache when writing to the server
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (47 preceding siblings ...)
2021-10-22 19:09 ` [PATCH v2 48/53] 9p: Use fscache indexing rewrite and reenable caching David Howells
@ 2021-10-22 19:10 ` David Howells
2021-10-22 19:10 ` [PATCH v2 50/53] nfs: Convert to new fscache volume/cookie API David Howells
` (5 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:10 UTC (permalink / raw)
To: linux-cachefs
Cc: Eric Van Hensbergen, Latchesar Ionkov, Dominique Martinet,
v9fs-developer, dhowells, Trond Myklebust, Anna Schumaker,
Steve French, Dominique Martinet, Jeff Layton, Matthew Wilcox,
Alexander Viro, Omar Sandoval, Linus Torvalds, linux-afs,
linux-nfs, linux-cifs, ceph-devel, v9fs-developer, linux-fsdevel,
linux-kernel
When writing to the server from v9fs_vfs_writepage(), copy the data to the
cache object too.
To make this possible, the cookie must have its active users count
incremented when the page is dirtied and kept incremented until we manage
to clean up all the pages. This allows the writeback to take place after
the last file struct is released.
This is done by taking a use on the cookie in v9fs_set_page_dirty() if we
haven't already done so (controlled by the I_PINNING_FSCACHE_WB flag) and
dropping the pin in v9fs_write_inode() if __writeback_single_inode() clears
all the outstanding dirty pages (conveyed by the unpinned_fscache_wb flag
in the writeback_control struct).
Inode eviction must also clear the flag after truncating away all the
outstanding pages.
In the future this will be handled more gracefully by netfslib.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Eric Van Hensbergen <ericvh@gmail.com>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: v9fs-developer@lists.sourceforge.net
cc: linux-cachefs@redhat.com
---
fs/9p/vfs_addr.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++-----
fs/9p/vfs_inode.c | 2 ++
fs/9p/vfs_super.c | 3 +++
3 files changed, 53 insertions(+), 5 deletions(-)
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 5bcc2ab5b277..c02da5be3b32 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -132,15 +132,17 @@ static void v9fs_vfs_readahead(struct readahead_control *ractl)
static int v9fs_release_page(struct page *page, gfp_t gfp)
{
+ struct inode *inode = page->mapping->host;
+ struct v9fs_inode *v9inode = V9FS_I(inode);
+
if (PagePrivate(page))
return 0;
-#ifdef CONFIG_9P_FSCACHE
if (PageFsCache(page)) {
if (!(gfp & __GFP_DIRECT_RECLAIM) || !(gfp & __GFP_FS))
return 0;
wait_on_page_fscache(page);
}
-#endif
+ fscache_note_page_release(v9fs_inode_cookie(v9inode));
return 1;
}
@@ -157,10 +159,23 @@ static void v9fs_invalidate_page(struct page *page, unsigned int offset,
wait_on_page_fscache(page);
}
+static void v9fs_write_to_cache_done(void *priv, ssize_t transferred_or_error,
+ bool was_async)
+{
+ struct v9fs_inode *v9inode = priv;
+
+ if (IS_ERR_VALUE(transferred_or_error) &&
+ transferred_or_error != -ENOBUFS)
+ fscache_invalidate(v9fs_inode_cookie(v9inode),
+ &v9inode->qid.version,
+ i_size_read(&v9inode->vfs_inode), 0);
+}
+
static int v9fs_vfs_writepage_locked(struct page *page)
{
struct inode *inode = page->mapping->host;
struct v9fs_inode *v9inode = V9FS_I(inode);
+ struct fscache_cookie *cookie = v9fs_inode_cookie(v9inode);
loff_t start = page_offset(page);
loff_t size = i_size_read(inode);
struct iov_iter from;
@@ -176,10 +191,21 @@ static int v9fs_vfs_writepage_locked(struct page *page)
/* We should have writeback_fid always set */
BUG_ON(!v9inode->writeback_fid);
+ wait_on_page_fscache(page);
+
set_page_writeback(page);
p9_client_write(v9inode->writeback_fid, start, &from, &err);
+ if (err == 0 &&
+ fscache_cookie_enabled(cookie) &&
+ test_bit(FSCACHE_COOKIE_IS_CACHING, &cookie->flags)) {
+ set_page_fscache(page);
+ fscache_write_to_cache(v9fs_inode_cookie(v9inode),
+ page->mapping, start, len, size,
+ v9fs_write_to_cache_done, v9inode);
+ }
+
end_page_writeback(page);
return err;
}
@@ -290,10 +316,12 @@ static int v9fs_write_begin(struct file *filp, struct address_space *mapping,
static int v9fs_write_end(struct file *filp, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
+ struct page *subpage, void *fsdata)
{
+ struct page *page = thp_head(subpage);
loff_t last_pos = pos + copied;
- struct inode *inode = page->mapping->host;
+ struct inode *inode = mapping->host;
+ struct v9fs_inode *v9inode = V9FS_I(inode);
p9_debug(P9_DEBUG_VFS, "filp %p, mapping %p\n", filp, mapping);
@@ -313,6 +341,7 @@ static int v9fs_write_end(struct file *filp, struct address_space *mapping,
if (last_pos > inode->i_size) {
inode_add_bytes(inode, last_pos - inode->i_size);
i_size_write(inode, last_pos);
+ fscache_update_cookie(v9fs_inode_cookie(v9inode), NULL, &last_pos);
}
set_page_dirty(page);
out:
@@ -322,11 +351,25 @@ static int v9fs_write_end(struct file *filp, struct address_space *mapping,
return copied;
}
+#ifdef CONFIG_9P_FSCACHE
+/*
+ * Mark a page as having been made dirty and thus needing writeback. We also
+ * need to pin the cache object to write back to.
+ */
+static int v9fs_set_page_dirty(struct page *page)
+{
+ struct v9fs_inode *v9inode = V9FS_I(page->mapping->host);
+
+ return fscache_set_page_dirty(page, v9fs_inode_cookie(v9inode));
+}
+#else
+#define v9fs_set_page_dirty __set_page_dirty_nobuffers
+#endif
const struct address_space_operations v9fs_addr_operations = {
.readpage = v9fs_vfs_readpage,
.readahead = v9fs_vfs_readahead,
- .set_page_dirty = __set_page_dirty_nobuffers,
+ .set_page_dirty = v9fs_set_page_dirty,
.writepage = v9fs_vfs_writepage,
.write_begin = v9fs_write_begin,
.write_end = v9fs_write_end,
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 83db37bd4252..a990c50cc27d 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -377,6 +377,8 @@ void v9fs_evict_inode(struct inode *inode)
struct v9fs_inode *v9inode = V9FS_I(inode);
truncate_inode_pages_final(&inode->i_data);
+ fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode,
+ &v9inode->qid.version);
clear_inode(inode);
filemap_fdatawrite(&inode->i_data);
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 5fce6e30bc5a..3721098e0992 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/magic.h>
+#include <linux/fscache.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
@@ -307,6 +308,7 @@ static int v9fs_write_inode(struct inode *inode,
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
return ret;
}
+ fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode));
return 0;
}
@@ -330,6 +332,7 @@ static int v9fs_write_inode_dotl(struct inode *inode,
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
return ret;
}
+ fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode));
return 0;
}
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 50/53] nfs: Convert to new fscache volume/cookie API
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (48 preceding siblings ...)
2021-10-22 19:10 ` [PATCH v2 49/53] 9p: Copy local writes to the cache when writing to the server David Howells
@ 2021-10-22 19:10 ` David Howells
2021-10-22 19:10 ` [PATCH v2 51/53] cifs: Support fscache indexing rewrite (untested) David Howells
` (4 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:10 UTC (permalink / raw)
To: linux-cachefs
Cc: Dave Wysochanski, Trond Myklebust, Anna Schumaker, linux-nfs,
dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
From: Dave Wysochanski <dwysocha@redhat.com>
Change the nfs filesystem to support fscache's indexing rewrite and
reenable caching in nfs.
The following changes have been made:
(1) The fscache_netfs struct is no more, and there's no need to register
the filesystem as a whole.
(2) The session cookie is now an fscache_volume cookie, allocated with
fscache_acquire_volume(). That takes three parameters: a string
representing the "volume" in the index, a string naming the cache to
use (or NULL) and a u64 that conveys coherency metadata for the
volume.
For nfs, I've made it render the volume name string as:
"nfs,<ver>,<family>,<address>,<port>,<fsidH>,<fsidL>*<,param>[,<uniq>]"
(3) The fscache_cookie_def is no more and needed information is passed
directly to fscache_acquire_cookie(). The cache no longer calls back
into the filesystem, but rather metadata changes are indicated at
other times.
fscache_acquire_cookie() is passed the same keying and coherency
information as before.
(4) fscache_enable/disable_cookie() have been removed.
Call fscache_use_cookie() and fscache_unuse_cookie() when a file is
opened or closed to prevent a cache file from being culled and to keep
resources to hand that are needed to do I/O.
Unuse the cookie when a file is opened for writing. This is gated by
the NFS_INO_FSCACHE flag on the nfs_inode.
A better way might be to invalidate it with FSCACHE_INVAL_DIO_WRITE
which will keep it unused until all open files are closed.
(5) fscache_invalidate() now needs to be given uptodate auxiliary data and
a file size. It also takes a flag to indicate if this was due to a
DIO write.
(6) Call nfs_fscache_invalidate() with FSCACHE_INVAL_DIO_WRITE on a file
to which a DIO write is made.
(7) Call fscache_note_page_release() from nfs_release_page().
(8) Use a killable wait in nfs_vm_page_mkwrite() when waiting for
PG_fscache to be cleared.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Co-developed-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Trond Myklebust <trond.myklebust@hammerspace.com>
cc: Anna Schumaker <anna.schumaker@netapp.com>
cc: linux-nfs@vger.kernel.org
cc: linux-cachefs@redhat.com
---
fs/nfs/Kconfig | 2
fs/nfs/Makefile | 2
fs/nfs/client.c | 4 -
fs/nfs/direct.c | 2
fs/nfs/file.c | 7 +
fs/nfs/fscache-index.c | 114 -------------------
fs/nfs/fscache.c | 264 +++++++++++++++------------------------------
fs/nfs/fscache.h | 91 ++++------------
fs/nfs/inode.c | 11 --
fs/nfs/super.c | 7 +
fs/nfs/write.c | 1
include/linux/nfs_fs_sb.h | 9 --
12 files changed, 127 insertions(+), 387 deletions(-)
delete mode 100644 fs/nfs/fscache-index.c
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index a8b73c90aa00..14a72224b657 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -170,7 +170,7 @@ config ROOT_NFS
config NFS_FSCACHE
bool "Provide NFS client caching support"
- depends on NFS_FS=m && FSCACHE_OLD || NFS_FS=y && FSCACHE_OLD=y
+ depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
help
Say Y here if you want NFS data to be cached locally on disc through
the general filesystem cache manager
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 22d11fdc6deb..5f6db37f461e 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -12,7 +12,7 @@ nfs-y := client.o dir.o file.o getroot.o inode.o super.o \
export.o sysfs.o fs_context.o
nfs-$(CONFIG_ROOT_NFS) += nfsroot.o
nfs-$(CONFIG_SYSCTL) += sysctl.o
-nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
+nfs-$(CONFIG_NFS_FSCACHE) += fscache.o
obj-$(CONFIG_NFS_V2) += nfsv2.o
nfsv2-y := nfs2super.o proc.o nfs2xdr.o
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 23e165d5ec9c..8f35e26d8a29 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -183,8 +183,6 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
clp->cl_net = get_net(cl_init->net);
clp->cl_principal = "*";
- nfs_fscache_get_client_cookie(clp);
-
return clp;
error_cleanup:
@@ -238,8 +236,6 @@ static void pnfs_init_server(struct nfs_server *server)
*/
void nfs_free_client(struct nfs_client *clp)
{
- nfs_fscache_release_client_cookie(clp);
-
/* -EIO all pending I/O */
if (!IS_ERR(clp->cl_rpcclient))
rpc_shutdown_client(clp->cl_rpcclient);
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 2e894fec036b..8b4839ef4b0c 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -59,6 +59,7 @@
#include "internal.h"
#include "iostat.h"
#include "pnfs.h"
+#include "fscache.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@@ -959,6 +960,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
} else {
result = requested;
}
+ nfs_fscache_invalidate(inode, FSCACHE_INVAL_DIO_WRITE);
out_release:
nfs_direct_req_release(dreq);
out:
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 209dac208477..0a7f1e9f1203 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -436,6 +436,7 @@ static int nfs_release_page(struct page *page, gfp_t gfp)
if (!(gfp & __GFP_DIRECT_RECLAIM) || !(gfp & __GFP_FS))
return false;
wait_on_page_fscache(page);
+ fscache_note_page_release(nfs_i_fscache(page->mapping->host));
}
return true;
}
@@ -559,7 +560,11 @@ static vm_fault_t nfs_vm_page_mkwrite(struct vm_fault *vmf)
sb_start_pagefault(inode->i_sb);
/* make sure the cache has finished storing the page */
- wait_on_page_fscache(page);
+ if (PageFsCache(page) &&
+ wait_on_page_fscache_killable(vmf->page) < 0) {
+ ret = VM_FAULT_RETRY;
+ goto out;
+ }
wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
nfs_wait_bit_killable, TASK_KILLABLE);
diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
deleted file mode 100644
index 4bd5ce736193..000000000000
--- a/fs/nfs/fscache-index.c
+++ /dev/null
@@ -1,114 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* NFS FS-Cache index structure definition
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/nfs_fs.h>
-#include <linux/nfs_fs_sb.h>
-#include <linux/in6.h>
-#include <linux/iversion.h>
-
-#include "internal.h"
-#include "fscache.h"
-
-#define NFSDBG_FACILITY NFSDBG_FSCACHE
-
-/*
- * Define the NFS filesystem for FS-Cache. Upon registration FS-Cache sticks
- * the cookie for the top-level index object for NFS into here. The top-level
- * index can than have other cache objects inserted into it.
- */
-struct fscache_netfs nfs_fscache_netfs = {
- .name = "nfs",
- .version = 0,
-};
-
-/*
- * Register NFS for caching
- */
-int nfs_fscache_register(void)
-{
- return fscache_register_netfs(&nfs_fscache_netfs);
-}
-
-/*
- * Unregister NFS for caching
- */
-void nfs_fscache_unregister(void)
-{
- fscache_unregister_netfs(&nfs_fscache_netfs);
-}
-
-/*
- * Define the server object for FS-Cache. This is used to describe a server
- * object to fscache_acquire_cookie(). It is keyed by the NFS protocol and
- * server address parameters.
- */
-const struct fscache_cookie_def nfs_fscache_server_index_def = {
- .name = "NFS.server",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-
-/*
- * Define the superblock object for FS-Cache. This is used to describe a
- * superblock object to fscache_acquire_cookie(). It is keyed by all the NFS
- * parameters that might cause a separate superblock.
- */
-const struct fscache_cookie_def nfs_fscache_super_index_def = {
- .name = "NFS.super",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-
-/*
- * Consult the netfs about the state of an object
- * - This function can be absent if the index carries no state data
- * - The netfs data from the cookie being used as the target is
- * presented, as is the auxiliary data
- */
-static
-enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
- const void *data,
- uint16_t datalen,
- loff_t object_size)
-{
- struct nfs_fscache_inode_auxdata auxdata;
- struct nfs_inode *nfsi = cookie_netfs_data;
-
- if (datalen != sizeof(auxdata))
- return FSCACHE_CHECKAUX_OBSOLETE;
-
- memset(&auxdata, 0, sizeof(auxdata));
- auxdata.mtime_sec = nfsi->vfs_inode.i_mtime.tv_sec;
- auxdata.mtime_nsec = nfsi->vfs_inode.i_mtime.tv_nsec;
- auxdata.ctime_sec = nfsi->vfs_inode.i_ctime.tv_sec;
- auxdata.ctime_nsec = nfsi->vfs_inode.i_ctime.tv_nsec;
-
- if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
- auxdata.change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
-
- if (memcmp(data, &auxdata, datalen) != 0)
- return FSCACHE_CHECKAUX_OBSOLETE;
-
- return FSCACHE_CHECKAUX_OKAY;
-}
-
-/*
- * Define the inode object for FS-Cache. This is used to describe an inode
- * object to fscache_acquire_cookie(). It is keyed by the NFS file handle for
- * an inode.
- *
- * Coherency is managed by comparing the copies of i_size, i_mtime and i_ctime
- * held in the cache auxiliary data for the data storage object with those in
- * the inode struct in memory.
- */
-const struct fscache_cookie_def nfs_fscache_inode_object_def = {
- .name = "NFS.fh",
- .type = FSCACHE_COOKIE_TYPE_DATAFILE,
- .check_aux = nfs_fscache_inode_check_aux,
-};
diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index 68e266a37675..c15bdf3606eb 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -22,24 +22,18 @@
#define NFSDBG_FACILITY NFSDBG_FSCACHE
-static struct rb_root nfs_fscache_keys = RB_ROOT;
-static DEFINE_SPINLOCK(nfs_fscache_keys_lock);
+#define NFS_MAX_KEY_LEN 1000
-/*
- * Layout of the key for an NFS server cache object.
- */
-struct nfs_server_key {
- struct {
- uint16_t nfsversion; /* NFS protocol version */
- uint32_t minorversion; /* NFSv4 minor version */
- uint16_t family; /* address family */
- __be16 port; /* IP port */
- } hdr;
- union {
- struct in_addr ipv4_addr; /* IPv4 address */
- struct in6_addr ipv6_addr; /* IPv6 address */
- };
-} __packed;
+static bool nfs_append_int(char *key, int *_len, unsigned long long x)
+{
+ if (*_len > NFS_MAX_KEY_LEN)
+ return false;
+ if (x == 0)
+ key[(*_len)++] = ',';
+ else
+ *_len += sprintf(key + *_len, ",%llx", x);
+ return true;
+}
/*
* Get the per-client index cookie for an NFS client if the appropriate mount
@@ -47,63 +41,43 @@ struct nfs_server_key {
* - We always try and get an index cookie for the client, but get filehandle
* cookies on a per-superblock basis, depending on the mount flags
*/
-void nfs_fscache_get_client_cookie(struct nfs_client *clp)
+static bool nfs_fscache_get_client_key(struct nfs_client *clp,
+ char *key, int *_len)
{
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &clp->cl_addr;
const struct sockaddr_in *sin = (struct sockaddr_in *) &clp->cl_addr;
- struct nfs_server_key key;
- uint16_t len = sizeof(key.hdr);
- memset(&key, 0, sizeof(key));
- key.hdr.nfsversion = clp->rpc_ops->version;
- key.hdr.minorversion = clp->cl_minorversion;
- key.hdr.family = clp->cl_addr.ss_family;
+ *_len += snprintf(key + *_len, NFS_MAX_KEY_LEN - *_len,
+ ",%u.%u,%x",
+ clp->rpc_ops->version,
+ clp->cl_minorversion,
+ clp->cl_addr.ss_family);
switch (clp->cl_addr.ss_family) {
case AF_INET:
- key.hdr.port = sin->sin_port;
- key.ipv4_addr = sin->sin_addr;
- len += sizeof(key.ipv4_addr);
- break;
+ if (!nfs_append_int(key, _len, sin->sin_port) ||
+ !nfs_append_int(key, _len, sin->sin_addr.s_addr))
+ return false;
+ return true;
case AF_INET6:
- key.hdr.port = sin6->sin6_port;
- key.ipv6_addr = sin6->sin6_addr;
- len += sizeof(key.ipv6_addr);
- break;
+ if (!nfs_append_int(key, _len, sin6->sin6_port) ||
+ !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[0]) ||
+ !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[1]) ||
+ !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[2]) ||
+ !nfs_append_int(key, _len, sin6->sin6_addr.s6_addr32[3]))
+ return false;
+ return true;
default:
printk(KERN_WARNING "NFS: Unknown network family '%d'\n",
clp->cl_addr.ss_family);
- clp->fscache = NULL;
- return;
+ return false;
}
-
- /* create a cache index for looking up filehandles */
- clp->fscache = fscache_acquire_cookie(nfs_fscache_netfs.primary_index,
- &nfs_fscache_server_index_def,
- &key, len,
- NULL, 0,
- clp, 0, true);
- dfprintk(FSCACHE, "NFS: get client cookie (0x%p/0x%p)\n",
- clp, clp->fscache);
}
/*
- * Dispose of a per-client cookie
- */
-void nfs_fscache_release_client_cookie(struct nfs_client *clp)
-{
- dfprintk(FSCACHE, "NFS: releasing client cookie (0x%p/0x%p)\n",
- clp, clp->fscache);
-
- fscache_relinquish_cookie(clp->fscache, NULL, false);
- clp->fscache = NULL;
-}
-
-/*
- * Get the cache cookie for an NFS superblock. We have to handle
- * uniquification here because the cache doesn't do it for us.
+ * Get the cache cookie for an NFS superblock.
*
* The default uniquifier is just an empty string, but it may be overridden
* either by the 'fsc=xxx' option to mount, or by inheriting it from the parent
@@ -111,96 +85,53 @@ void nfs_fscache_release_client_cookie(struct nfs_client *clp)
*/
void nfs_fscache_get_super_cookie(struct super_block *sb, const char *uniq, int ulen)
{
- struct nfs_fscache_key *key, *xkey;
struct nfs_server *nfss = NFS_SB(sb);
- struct rb_node **p, *parent;
- int diff;
+ unsigned int len = 3;
+ char *key;
- nfss->fscache_key = NULL;
- nfss->fscache = NULL;
- if (!uniq) {
- uniq = "";
- ulen = 1;
+ if (uniq) {
+ nfss->fscache_uniq = kmemdup_nul(uniq, ulen, GFP_KERNEL);
+ if (!nfss->fscache_uniq)
+ return;
}
- key = kzalloc(sizeof(*key) + ulen, GFP_KERNEL);
+ key = kmalloc(NFS_MAX_KEY_LEN + 24, GFP_KERNEL);
if (!key)
return;
- key->nfs_client = nfss->nfs_client;
- key->key.super.s_flags = sb->s_flags & NFS_SB_MASK;
- key->key.nfs_server.flags = nfss->flags;
- key->key.nfs_server.rsize = nfss->rsize;
- key->key.nfs_server.wsize = nfss->wsize;
- key->key.nfs_server.acregmin = nfss->acregmin;
- key->key.nfs_server.acregmax = nfss->acregmax;
- key->key.nfs_server.acdirmin = nfss->acdirmin;
- key->key.nfs_server.acdirmax = nfss->acdirmax;
- key->key.nfs_server.fsid = nfss->fsid;
- key->key.rpc_auth.au_flavor = nfss->client->cl_auth->au_flavor;
-
- key->key.uniq_len = ulen;
- memcpy(key->key.uniquifier, uniq, ulen);
-
- spin_lock(&nfs_fscache_keys_lock);
- p = &nfs_fscache_keys.rb_node;
- parent = NULL;
- while (*p) {
- parent = *p;
- xkey = rb_entry(parent, struct nfs_fscache_key, node);
-
- if (key->nfs_client < xkey->nfs_client)
- goto go_left;
- if (key->nfs_client > xkey->nfs_client)
- goto go_right;
-
- diff = memcmp(&key->key, &xkey->key, sizeof(key->key));
- if (diff < 0)
- goto go_left;
- if (diff > 0)
- goto go_right;
-
- if (key->key.uniq_len == 0)
- goto non_unique;
- diff = memcmp(key->key.uniquifier,
- xkey->key.uniquifier,
- key->key.uniq_len);
- if (diff < 0)
- goto go_left;
- if (diff > 0)
- goto go_right;
- goto non_unique;
-
- go_left:
- p = &(*p)->rb_left;
- continue;
- go_right:
- p = &(*p)->rb_right;
+ memcpy(key, "nfs", 3);
+ if (!nfs_fscache_get_client_key(nfss->nfs_client, key, &len) ||
+ !nfs_append_int(key, &len, nfss->fsid.major) ||
+ !nfs_append_int(key, &len, nfss->fsid.minor) ||
+ !nfs_append_int(key, &len, sb->s_flags & NFS_SB_MASK) ||
+ !nfs_append_int(key, &len, nfss->flags) ||
+ !nfs_append_int(key, &len, nfss->rsize) ||
+ !nfs_append_int(key, &len, nfss->wsize) ||
+ !nfs_append_int(key, &len, nfss->acregmin) ||
+ !nfs_append_int(key, &len, nfss->acregmax) ||
+ !nfs_append_int(key, &len, nfss->acdirmin) ||
+ !nfs_append_int(key, &len, nfss->acdirmax) ||
+ !nfs_append_int(key, &len, nfss->client->cl_auth->au_flavor))
+ goto out;
+
+ if (ulen > 0) {
+ if (ulen > NFS_MAX_KEY_LEN - len)
+ goto out;
+ key[len++] = ',';
+ memcpy(key + len, uniq, ulen);
+ len += ulen;
}
-
- rb_link_node(&key->node, parent, p);
- rb_insert_color(&key->node, &nfs_fscache_keys);
- spin_unlock(&nfs_fscache_keys_lock);
- nfss->fscache_key = key;
+ key[len] = 0;
/* create a cache index for looking up filehandles */
- nfss->fscache = fscache_acquire_cookie(nfss->nfs_client->fscache,
- &nfs_fscache_super_index_def,
- &key->key,
- sizeof(key->key) + ulen,
- NULL, 0,
- nfss, 0, true);
+ nfss->fscache = fscache_acquire_volume(key,
+ NULL, /* preferred_cache */
+ 0 /* coherency_data */);
dfprintk(FSCACHE, "NFS: get superblock cookie (0x%p/0x%p)\n",
nfss, nfss->fscache);
- return;
-non_unique:
- spin_unlock(&nfs_fscache_keys_lock);
+out:
kfree(key);
- nfss->fscache_key = NULL;
- nfss->fscache = NULL;
- printk(KERN_WARNING "NFS:"
- " Cache request denied due to non-unique superblock keys\n");
}
/*
@@ -213,29 +144,9 @@ void nfs_fscache_release_super_cookie(struct super_block *sb)
dfprintk(FSCACHE, "NFS: releasing superblock cookie (0x%p/0x%p)\n",
nfss, nfss->fscache);
- fscache_relinquish_cookie(nfss->fscache, NULL, false);
+ fscache_relinquish_volume(nfss->fscache, 0, false);
nfss->fscache = NULL;
-
- if (nfss->fscache_key) {
- spin_lock(&nfs_fscache_keys_lock);
- rb_erase(&nfss->fscache_key->node, &nfs_fscache_keys);
- spin_unlock(&nfs_fscache_keys_lock);
- kfree(nfss->fscache_key);
- nfss->fscache_key = NULL;
- }
-}
-
-static void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *auxdata,
- struct nfs_inode *nfsi)
-{
- memset(auxdata, 0, sizeof(*auxdata));
- auxdata->mtime_sec = nfsi->vfs_inode.i_mtime.tv_sec;
- auxdata->mtime_nsec = nfsi->vfs_inode.i_mtime.tv_nsec;
- auxdata->ctime_sec = nfsi->vfs_inode.i_ctime.tv_sec;
- auxdata->ctime_nsec = nfsi->vfs_inode.i_ctime.tv_nsec;
-
- if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
- auxdata->change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
+ kfree(nfss->fscache_uniq);
}
/*
@@ -254,10 +165,12 @@ void nfs_fscache_init_inode(struct inode *inode)
nfs_fscache_update_auxdata(&auxdata, nfsi);
nfsi->fscache = fscache_acquire_cookie(NFS_SB(inode->i_sb)->fscache,
- &nfs_fscache_inode_object_def,
- nfsi->fh.data, nfsi->fh.size,
- &auxdata, sizeof(auxdata),
- nfsi, nfsi->vfs_inode.i_size, false);
+ FSCACHE_ADV_FALLBACK_IO,
+ nfsi->fh.data, /* index_key */
+ nfsi->fh.size,
+ &auxdata, /* aux_data */
+ sizeof(auxdata),
+ i_size_read(&nfsi->vfs_inode));
}
/*
@@ -271,18 +184,14 @@ void nfs_fscache_clear_inode(struct inode *inode)
dfprintk(FSCACHE, "NFS: clear cookie (0x%p/0x%p)\n", nfsi, cookie);
- nfs_fscache_update_auxdata(&auxdata, nfsi);
- fscache_relinquish_cookie(cookie, &auxdata, false);
+ if (test_and_clear_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags)) {
+ nfs_fscache_update_auxdata(&auxdata, nfsi);
+ fscache_unuse_cookie(cookie, &auxdata, NULL);
+ }
+ fscache_relinquish_cookie(cookie, false);
nfsi->fscache = NULL;
}
-static bool nfs_fscache_can_enable(void *data)
-{
- struct inode *inode = data;
-
- return !inode_is_open_for_write(inode);
-}
-
/*
* Enable or disable caching for a file that is being opened as appropriate.
* The cookie is allocated when the inode is initialised, but is not enabled at
@@ -311,18 +220,17 @@ void nfs_fscache_open_file(struct inode *inode, struct file *filp)
if (!fscache_cookie_valid(cookie))
return;
- nfs_fscache_update_auxdata(&auxdata, nfsi);
-
if (inode_is_open_for_write(inode)) {
- dfprintk(FSCACHE, "NFS: nfsi 0x%p disabling cache\n", nfsi);
- clear_bit(NFS_INO_FSCACHE, &nfsi->flags);
- fscache_disable_cookie(cookie, &auxdata, true);
+ if (test_and_clear_bit(NFS_INO_FSCACHE, &nfsi->flags)) {
+ dfprintk(FSCACHE, "NFS: nfsi 0x%p disabling cache\n", nfsi);
+ nfs_fscache_update_auxdata(&auxdata, nfsi);
+ fscache_unuse_cookie(cookie, &auxdata, NULL);
+ }
} else {
- dfprintk(FSCACHE, "NFS: nfsi 0x%p enabling cache\n", nfsi);
- fscache_enable_cookie(cookie, &auxdata, nfsi->vfs_inode.i_size,
- nfs_fscache_can_enable, inode);
- if (fscache_cookie_enabled(cookie))
- set_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
+ if (!test_and_set_bit(NFS_INO_FSCACHE, &nfsi->flags)) {
+ dfprintk(FSCACHE, "NFS: nfsi 0x%p enabling cache\n", nfsi);
+ fscache_use_cookie(cookie, false);
+ }
}
}
EXPORT_SYMBOL_GPL(nfs_fscache_open_file);
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index a87c51063aa1..0cf2fbe30051 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h
@@ -12,47 +12,11 @@
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#define FSCACHE_USE_FALLBACK_IO_API
-#include <linux/fscache_old.h>
+#include <linux/fscache.h>
+#include <linux/iversion.h>
#ifdef CONFIG_NFS_FSCACHE
-/*
- * set of NFS FS-Cache objects that form a superblock key
- */
-struct nfs_fscache_key {
- struct rb_node node;
- struct nfs_client *nfs_client; /* the server */
-
- /* the elements of the unique key - as used by nfs_compare_super() and
- * nfs_compare_mount_options() to distinguish superblocks */
- struct {
- struct {
- unsigned long s_flags; /* various flags
- * (& NFS_MS_MASK) */
- } super;
-
- struct {
- struct nfs_fsid fsid;
- int flags;
- unsigned int rsize; /* read size */
- unsigned int wsize; /* write size */
- unsigned int acregmin; /* attr cache timeouts */
- unsigned int acregmax;
- unsigned int acdirmin;
- unsigned int acdirmax;
- } nfs_server;
-
- struct {
- rpc_authflavor_t au_flavor;
- } rpc_auth;
-
- /* uniquifier - can be used if nfs_server.flags includes
- * NFS_MOUNT_UNSHARED */
- u8 uniq_len;
- char uniquifier[0];
- } key;
-};
-
/*
* Definition of the auxiliary data attached to NFS inode storage objects
* within the cache.
@@ -70,23 +34,9 @@ struct nfs_fscache_inode_auxdata {
u64 change_attr;
};
-/*
- * fscache-index.c
- */
-extern struct fscache_netfs nfs_fscache_netfs;
-extern const struct fscache_cookie_def nfs_fscache_server_index_def;
-extern const struct fscache_cookie_def nfs_fscache_super_index_def;
-extern const struct fscache_cookie_def nfs_fscache_inode_object_def;
-
-extern int nfs_fscache_register(void);
-extern void nfs_fscache_unregister(void);
-
/*
* fscache.c
*/
-extern void nfs_fscache_get_client_cookie(struct nfs_client *);
-extern void nfs_fscache_release_client_cookie(struct nfs_client *);
-
extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
extern void nfs_fscache_release_super_cookie(struct super_block *);
@@ -121,20 +71,32 @@ static inline void nfs_readpage_to_fscache(struct inode *inode,
__nfs_readpage_to_fscache(inode, page);
}
-/*
- * Invalidate the contents of fscache for this inode. This will not sleep.
- */
-static inline void nfs_fscache_invalidate(struct inode *inode)
+static inline void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *auxdata,
+ struct nfs_inode *nfsi)
{
- fscache_invalidate(NFS_I(inode)->fscache);
+ memset(auxdata, 0, sizeof(*auxdata));
+ auxdata->mtime_sec = nfsi->vfs_inode.i_mtime.tv_sec;
+ auxdata->mtime_nsec = nfsi->vfs_inode.i_mtime.tv_nsec;
+ auxdata->ctime_sec = nfsi->vfs_inode.i_ctime.tv_sec;
+ auxdata->ctime_nsec = nfsi->vfs_inode.i_ctime.tv_nsec;
+
+ if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
+ auxdata->change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
}
/*
- * Wait for an object to finish being invalidated.
+ * Invalidate the contents of fscache for this inode. This will not sleep.
*/
-static inline void nfs_fscache_wait_on_invalidate(struct inode *inode)
+static inline void nfs_fscache_invalidate(struct inode *inode, int flags)
{
- fscache_wait_on_invalidate(NFS_I(inode)->fscache);
+ struct nfs_fscache_inode_auxdata auxdata;
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ if (nfsi->fscache) {
+ nfs_fscache_update_auxdata(&auxdata, nfsi);
+ fscache_invalidate(nfsi->fscache, &auxdata,
+ i_size_read(&nfsi->vfs_inode), flags);
+ }
}
/*
@@ -148,12 +110,6 @@ static inline const char *nfs_server_fscache_state(struct nfs_server *server)
}
#else /* CONFIG_NFS_FSCACHE */
-static inline int nfs_fscache_register(void) { return 0; }
-static inline void nfs_fscache_unregister(void) {}
-
-static inline void nfs_fscache_get_client_cookie(struct nfs_client *clp) {}
-static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
-
static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
static inline void nfs_fscache_init_inode(struct inode *inode) {}
@@ -170,8 +126,7 @@ static inline void nfs_readpage_to_fscache(struct inode *inode,
struct page *page) {}
-static inline void nfs_fscache_invalidate(struct inode *inode) {}
-static inline void nfs_fscache_wait_on_invalidate(struct inode *inode) {}
+static inline void nfs_fscache_invalidate(struct inode *inode, int flags) {}
static inline const char *nfs_server_fscache_state(struct nfs_server *server)
{
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 853213b3a209..1cfc8f5c9fe2 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -209,7 +209,7 @@ void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
if (!nfs_has_xattr_cache(nfsi))
flags &= ~NFS_INO_INVALID_XATTR;
if (flags & NFS_INO_INVALID_DATA)
- nfs_fscache_invalidate(inode);
+ nfs_fscache_invalidate(inode, 0);
if (inode->i_mapping->nrpages == 0)
flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
flags &= ~(NFS_INO_REVAL_PAGECACHE | NFS_INO_REVAL_FORCED);
@@ -1281,6 +1281,7 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map
{
int ret;
+ nfs_fscache_invalidate(inode, 0);
if (mapping->nrpages != 0) {
if (S_ISREG(inode->i_mode)) {
ret = nfs_sync_mapping(mapping);
@@ -1292,7 +1293,6 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map
return ret;
}
nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
- nfs_fscache_wait_on_invalidate(inode);
dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
inode->i_sb->s_id,
@@ -2361,10 +2361,6 @@ static int __init init_nfs_fs(void)
if (err < 0)
goto out9;
- err = nfs_fscache_register();
- if (err < 0)
- goto out8;
-
err = nfsiod_start();
if (err)
goto out7;
@@ -2416,8 +2412,6 @@ static int __init init_nfs_fs(void)
out6:
nfsiod_stop();
out7:
- nfs_fscache_unregister();
-out8:
unregister_pernet_subsys(&nfs_net_ops);
out9:
nfs_sysfs_exit();
@@ -2432,7 +2426,6 @@ static void __exit exit_nfs_fs(void)
nfs_destroy_readpagecache();
nfs_destroy_inodecache();
nfs_destroy_nfspagecache();
- nfs_fscache_unregister();
unregister_pernet_subsys(&nfs_net_ops);
rpc_proc_unregister(&init_net, "nfs");
unregister_nfs_fs();
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index e65c83494c05..e73d4adba50f 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1206,7 +1206,6 @@ static void nfs_get_cache_cookie(struct super_block *sb,
char *uniq = NULL;
int ulen = 0;
- nfss->fscache_key = NULL;
nfss->fscache = NULL;
if (!ctx)
@@ -1216,9 +1215,9 @@ static void nfs_get_cache_cookie(struct super_block *sb,
struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
if (!(mnt_s->options & NFS_OPTION_FSCACHE))
return;
- if (mnt_s->fscache_key) {
- uniq = mnt_s->fscache_key->key.uniquifier;
- ulen = mnt_s->fscache_key->key.uniq_len;
+ if (mnt_s->fscache_uniq) {
+ uniq = mnt_s->fscache_uniq;
+ ulen = strlen(uniq);
}
} else {
if (!(ctx->options & NFS_OPTION_FSCACHE))
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 466266a96b2a..cbbf400db126 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -293,6 +293,7 @@ static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int c
nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
out:
spin_unlock(&inode->i_lock);
+ nfs_fscache_invalidate(inode, 0);
}
/* A writeback failed: mark the page as bad, and invalidate the page cache */
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 2a9acbfe00f0..77b2dba27bbb 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -120,11 +120,6 @@ struct nfs_client {
* This is used to generate the mv0 callback address.
*/
char cl_ipaddr[48];
-
-#ifdef CONFIG_NFS_FSCACHE
- struct fscache_cookie *fscache; /* client index cache cookie */
-#endif
-
struct net *cl_net;
struct list_head pending_cb_stateids;
};
@@ -194,8 +189,8 @@ struct nfs_server {
struct nfs_auth_info auth_info; /* parsed auth flavors */
#ifdef CONFIG_NFS_FSCACHE
- struct nfs_fscache_key *fscache_key; /* unique key for superblock */
- struct fscache_cookie *fscache; /* superblock cookie */
+ struct fscache_volume *fscache; /* superblock cookie */
+ char *fscache_uniq; /* Uniquifier (or NULL) */
#endif
u32 pnfs_blksize; /* layout_blksize attr */
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 51/53] cifs: Support fscache indexing rewrite (untested)
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (49 preceding siblings ...)
2021-10-22 19:10 ` [PATCH v2 50/53] nfs: Convert to new fscache volume/cookie API David Howells
@ 2021-10-22 19:10 ` David Howells
2021-10-22 19:10 ` [PATCH v2 52/53] fscache, cachefiles: Display stats of no-space events David Howells
` (3 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:10 UTC (permalink / raw)
To: linux-cachefs
Cc: Jeff Layton, Steve French, Shyam Prasad N, linux-cifs, dhowells,
Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Change the cifs filesystem to take account of the changes to fscache's
indexing rewrite and reenable caching in cifs.
The following changes have been made:
(1) The fscache_netfs struct is no more, and there's no need to register
the filesystem as a whole.
(2) The session cookie is now an fscache_volume cookie, allocated with
fscache_acquire_volume(). That takes three parameters: a string
representing the "volume" in the index, a string naming the cache to
use (or NULL) and a u64 that conveys coherency metadata for the
volume.
For cifs, I've made it render the volume name string as:
"cifs,<ipaddress>,<sharename>"
where the sharename has '/' characters replaced with ';'.
This probably needs rethinking a bit as the total name could exceed
the maximum filename component length.
Further, the coherency data is currently just set to 0. It needs
something else doing with it - I wonder if it would suffice simply to
sum the resource_id, vol_create_time and vol_serial_number or maybe
hash them.
(3) The fscache_cookie_def is no more and needed information is passed
directly to fscache_acquire_cookie(). The cache no longer calls back
into the filesystem, but rather metadata changes are indicated at
other times.
fscache_acquire_cookie() is passed the same keying and coherency
information as before.
(4) The functions to set/reset cookies are removed and
fscache_use_cookie() and fscache_unuse_cookie() are used instead.
fscache_use_cookie() is passed a flag to indicate if the cookie is
opened for writing. fscache_unuse_cookie() is passed updates for the
metadata if we changed it (ie. if the file was opened for writing).
These are called when the file is opened or closed.
(5) cifs_setattr_*() are made to call fscache_resize() to change the size
of the cache object.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: linux-cifs@vger.kernel.org
cc: linux-cachefs@redhat.com
---
fs/cifs/Kconfig | 2 -
fs/cifs/Makefile | 2 -
fs/cifs/cache.c | 105 ---------------------------
fs/cifs/cifsfs.c | 11 +--
fs/cifs/cifsglob.h | 5 -
fs/cifs/connect.c | 3 -
fs/cifs/file.c | 37 ++++++++--
fs/cifs/fscache.c | 201 +++++++++++++---------------------------------------
fs/cifs/fscache.h | 53 +++++---------
fs/cifs/inode.c | 18 +++--
10 files changed, 118 insertions(+), 319 deletions(-)
delete mode 100644 fs/cifs/cache.c
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index c5477abbcff0..3b7e3b9e4fd2 100644
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -188,7 +188,7 @@ config CIFS_SMB_DIRECT
config CIFS_FSCACHE
bool "Provide CIFS client caching support"
- depends on CIFS=m && FSCACHE_OLD || CIFS=y && FSCACHE_OLD=y
+ depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
help
Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
to be cached locally on disk through the general filesystem cache
diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
index 87fcacdf3de7..cc8fdcb35b71 100644
--- a/fs/cifs/Makefile
+++ b/fs/cifs/Makefile
@@ -25,7 +25,7 @@ cifs-$(CONFIG_CIFS_DFS_UPCALL) += cifs_dfs_ref.o dfs_cache.o
cifs-$(CONFIG_CIFS_SWN_UPCALL) += netlink.o cifs_swn.o
-cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
+cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o
cifs-$(CONFIG_CIFS_SMB_DIRECT) += smbdirect.o
diff --git a/fs/cifs/cache.c b/fs/cifs/cache.c
deleted file mode 100644
index 8be57aaedab6..000000000000
--- a/fs/cifs/cache.c
+++ /dev/null
@@ -1,105 +0,0 @@
-// SPDX-License-Identifier: LGPL-2.1
-/*
- * CIFS filesystem cache index structure definitions
- *
- * Copyright (c) 2010 Novell, Inc.
- * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
- *
- */
-#include "fscache.h"
-#include "cifs_debug.h"
-
-/*
- * CIFS filesystem definition for FS-Cache
- */
-struct fscache_netfs cifs_fscache_netfs = {
- .name = "cifs",
- .version = 0,
-};
-
-/*
- * Register CIFS for caching with FS-Cache
- */
-int cifs_fscache_register(void)
-{
- return fscache_register_netfs(&cifs_fscache_netfs);
-}
-
-/*
- * Unregister CIFS for caching
- */
-void cifs_fscache_unregister(void)
-{
- fscache_unregister_netfs(&cifs_fscache_netfs);
-}
-
-/*
- * Server object for FS-Cache
- */
-const struct fscache_cookie_def cifs_fscache_server_index_def = {
- .name = "CIFS.server",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
-};
-
-static enum
-fscache_checkaux cifs_fscache_super_check_aux(void *cookie_netfs_data,
- const void *data,
- uint16_t datalen,
- loff_t object_size)
-{
- struct cifs_fscache_super_auxdata auxdata;
- const struct cifs_tcon *tcon = cookie_netfs_data;
-
- if (datalen != sizeof(auxdata))
- return FSCACHE_CHECKAUX_OBSOLETE;
-
- memset(&auxdata, 0, sizeof(auxdata));
- auxdata.resource_id = tcon->resource_id;
- auxdata.vol_create_time = tcon->vol_create_time;
- auxdata.vol_serial_number = tcon->vol_serial_number;
-
- if (memcmp(data, &auxdata, datalen) != 0)
- return FSCACHE_CHECKAUX_OBSOLETE;
-
- return FSCACHE_CHECKAUX_OKAY;
-}
-
-/*
- * Superblock object for FS-Cache
- */
-const struct fscache_cookie_def cifs_fscache_super_index_def = {
- .name = "CIFS.super",
- .type = FSCACHE_COOKIE_TYPE_INDEX,
- .check_aux = cifs_fscache_super_check_aux,
-};
-
-static enum
-fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
- const void *data,
- uint16_t datalen,
- loff_t object_size)
-{
- struct cifs_fscache_inode_auxdata auxdata;
- struct cifsInodeInfo *cifsi = cookie_netfs_data;
-
- if (datalen != sizeof(auxdata))
- return FSCACHE_CHECKAUX_OBSOLETE;
-
- memset(&auxdata, 0, sizeof(auxdata));
- auxdata.eof = cifsi->server_eof;
- auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
- auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
- auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
- auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
-
- if (memcmp(data, &auxdata, datalen) != 0)
- return FSCACHE_CHECKAUX_OBSOLETE;
-
- return FSCACHE_CHECKAUX_OKAY;
-}
-
-const struct fscache_cookie_def cifs_fscache_inode_object_def = {
- .name = "CIFS.uniqueid",
- .type = FSCACHE_COOKIE_TYPE_DATAFILE,
- .check_aux = cifs_fscache_inode_check_aux,
-};
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 9fa930dfd78d..d44a587a4c32 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -397,6 +397,8 @@ static void
cifs_evict_inode(struct inode *inode)
{
truncate_inode_pages_final(&inode->i_data);
+ if (inode->i_state & I_PINNING_FSCACHE_WB)
+ cifs_fscache_unuse_inode_cookie(inode, true);
clear_inode(inode);
}
@@ -1625,13 +1627,9 @@ init_cifs(void)
goto out_destroy_cifsoplockd_wq;
}
- rc = cifs_fscache_register();
- if (rc)
- goto out_destroy_deferredclose_wq;
-
rc = cifs_init_inodecache();
if (rc)
- goto out_unreg_fscache;
+ goto out_destroy_deferredclose_wq;
rc = cifs_init_mids();
if (rc)
@@ -1693,8 +1691,6 @@ init_cifs(void)
cifs_destroy_mids();
out_destroy_inodecache:
cifs_destroy_inodecache();
-out_unreg_fscache:
- cifs_fscache_unregister();
out_destroy_deferredclose_wq:
destroy_workqueue(deferredclose_wq);
out_destroy_cifsoplockd_wq:
@@ -1730,7 +1726,6 @@ exit_cifs(void)
cifs_destroy_request_bufs();
cifs_destroy_mids();
cifs_destroy_inodecache();
- cifs_fscache_unregister();
destroy_workqueue(deferredclose_wq);
destroy_workqueue(cifsoplockd_wq);
destroy_workqueue(decrypt_wq);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index e916470468ea..d749250af775 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -653,9 +653,6 @@ struct TCP_Server_Info {
unsigned int total_read; /* total amount of data read in this pass */
atomic_t in_send; /* requests trying to send */
atomic_t num_waiters; /* blocked waiting to get in sendrecv */
-#ifdef CONFIG_CIFS_FSCACHE
- struct fscache_cookie *fscache; /* client index cache cookie */
-#endif
#ifdef CONFIG_CIFS_STATS2
atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */
atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */
@@ -1084,7 +1081,7 @@ struct cifs_tcon {
__u32 max_bytes_copy;
#ifdef CONFIG_CIFS_FSCACHE
u64 resource_id; /* server resource id */
- struct fscache_cookie *fscache; /* cookie for share */
+ struct fscache_volume *fscache; /* cookie for share */
#endif
struct list_head pending_opens; /* list of incomplete opens */
struct cached_fid crfid; /* Cached root fid */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index c3b94c1e4591..db13e0f8bc4c 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1331,7 +1331,6 @@ cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
spin_unlock(&GlobalMid_Lock);
cifs_crypto_secmech_release(server);
- cifs_fscache_release_client_cookie(server);
kfree(server->session_key.response);
server->session_key.response = NULL;
@@ -1477,8 +1476,6 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx)
list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
- cifs_fscache_get_client_cookie(tcp_ses);
-
/* queue echo request delayed work */
queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 02894e999c56..04c841354077 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -632,7 +632,18 @@ int cifs_open(struct inode *inode, struct file *file)
goto out;
}
- cifs_fscache_set_inode_cookie(inode, file);
+
+ fscache_use_cookie(cifs_inode_cookie(file_inode(file)),
+ file->f_mode & FMODE_WRITE);
+ if (file->f_flags & O_DIRECT &&
+ (!((file->f_flags & O_ACCMODE) != O_RDONLY) ||
+ file->f_flags & O_APPEND)) {
+ struct cifs_fscache_inode_auxdata auxdata;
+ cifs_fscache_fill_auxdata(file_inode(file), &auxdata);
+ fscache_invalidate(cifs_inode_cookie(file_inode(file)),
+ &auxdata, i_size_read(file_inode(file)),
+ FSCACHE_INVAL_DIO_WRITE);
+ }
if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
/*
@@ -876,6 +887,8 @@ int cifs_close(struct inode *inode, struct file *file)
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_deferred_close *dclose;
+ cifs_fscache_unuse_inode_cookie(inode, file->f_mode & FMODE_WRITE);
+
if (file->private_data != NULL) {
cfile = file->private_data;
file->private_data = NULL;
@@ -886,7 +899,6 @@ int cifs_close(struct inode *inode, struct file *file)
dclose) {
if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) {
inode->i_ctime = inode->i_mtime = current_time(inode);
- cifs_fscache_update_inode_cookie(inode);
}
spin_lock(&cinode->deferred_lock);
cifs_add_deferred_close(cfile, dclose);
@@ -4787,14 +4799,14 @@ static int cifs_release_page(struct page *page, gfp_t gfp)
return false;
wait_on_page_fscache(page);
}
+ fscache_note_page_release(cifs_inode_cookie(page->mapping->host));
return true;
}
static void cifs_invalidate_page(struct page *page, unsigned int offset,
unsigned int length)
{
- if (offset == 0 && length == PAGE_SIZE)
- wait_on_page_fscache(page);
+ wait_on_page_fscache(page);
}
static int cifs_launder_page(struct page *page)
@@ -4971,6 +4983,19 @@ static void cifs_swap_deactivate(struct file *file)
/* do we need to unpin (or unlock) the file */
}
+/*
+ * Mark a page as having been made dirty and thus needing writeback. We also
+ * need to pin the cache object to write back to.
+ */
+#ifdef CONFIG_CIFS_FSCACHE
+static int cifs_set_page_dirty(struct page *page)
+{
+ return fscache_set_page_dirty(page, cifs_inode_cookie(page->mapping->host));
+}
+#else
+#define cifs_set_page_dirty __set_page_dirty_nobuffers
+#endif
+
const struct address_space_operations cifs_addr_ops = {
.readpage = cifs_readpage,
.readpages = cifs_readpages,
@@ -4978,7 +5003,7 @@ const struct address_space_operations cifs_addr_ops = {
.writepages = cifs_writepages,
.write_begin = cifs_write_begin,
.write_end = cifs_write_end,
- .set_page_dirty = __set_page_dirty_nobuffers,
+ .set_page_dirty = cifs_set_page_dirty,
.releasepage = cifs_release_page,
.direct_IO = cifs_direct_io,
.invalidatepage = cifs_invalidate_page,
@@ -5003,7 +5028,7 @@ const struct address_space_operations cifs_addr_ops_smallbuf = {
.writepages = cifs_writepages,
.write_begin = cifs_write_begin,
.write_end = cifs_write_end,
- .set_page_dirty = __set_page_dirty_nobuffers,
+ .set_page_dirty = cifs_set_page_dirty,
.releasepage = cifs_release_page,
.invalidatepage = cifs_invalidate_page,
.launder_page = cifs_launder_page,
diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c
index d6ff668c268a..fa397e734b5c 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -12,217 +12,114 @@
#include "cifs_fs_sb.h"
#include "cifsproto.h"
-/*
- * Key layout of CIFS server cache index object
- */
-struct cifs_server_key {
- struct {
- uint16_t family; /* address family */
- __be16 port; /* IP port */
- } hdr;
- union {
- struct in_addr ipv4_addr;
- struct in6_addr ipv6_addr;
- };
-} __packed;
-
-/*
- * Get a cookie for a server object keyed by {IPaddress,port,family} tuple
- */
-void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
+void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
{
- const struct sockaddr *sa = (struct sockaddr *) &server->dstaddr;
- const struct sockaddr_in *addr = (struct sockaddr_in *) sa;
- const struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) sa;
- struct cifs_server_key key;
- uint16_t key_len = sizeof(key.hdr);
-
- memset(&key, 0, sizeof(key));
+ struct cifs_fscache_super_auxdata auxdata;
+ struct TCP_Server_Info *server = tcon->ses->server;
+ const struct sockaddr *sa = (struct sockaddr *)&server->dstaddr;
+ size_t slen, i;
+ char *sharename;
+ char *key;
- /*
- * Should not be a problem as sin_family/sin6_family overlays
- * sa_family field
- */
- key.hdr.family = sa->sa_family;
+ tcon->fscache = NULL;
switch (sa->sa_family) {
case AF_INET:
- key.hdr.port = addr->sin_port;
- key.ipv4_addr = addr->sin_addr;
- key_len += sizeof(key.ipv4_addr);
- break;
-
case AF_INET6:
- key.hdr.port = addr6->sin6_port;
- key.ipv6_addr = addr6->sin6_addr;
- key_len += sizeof(key.ipv6_addr);
break;
-
default:
cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family);
- server->fscache = NULL;
return;
}
- server->fscache =
- fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
- &cifs_fscache_server_index_def,
- &key, key_len,
- NULL, 0,
- server, 0, true);
- cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
- __func__, server, server->fscache);
-}
-
-void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
-{
- cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
- __func__, server, server->fscache);
- fscache_relinquish_cookie(server->fscache, NULL, false);
- server->fscache = NULL;
-}
-
-void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
-{
- struct TCP_Server_Info *server = tcon->ses->server;
- char *sharename;
- struct cifs_fscache_super_auxdata auxdata;
-
sharename = extract_sharename(tcon->treeName);
if (IS_ERR(sharename)) {
cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);
- tcon->fscache = NULL;
return;
}
+ slen = strlen(sharename);
+ for (i = 0; i < slen; i++)
+ if (sharename[i] == '/')
+ sharename[i] = ';';
+
+ key = kasprintf(GFP_KERNEL, "cifs,%pISpc,%s", sa, sharename);
+ if (!key)
+ goto out;
+
memset(&auxdata, 0, sizeof(auxdata));
auxdata.resource_id = tcon->resource_id;
auxdata.vol_create_time = tcon->vol_create_time;
auxdata.vol_serial_number = tcon->vol_serial_number;
+ // TODO: Do something with the volume coherency data
- tcon->fscache =
- fscache_acquire_cookie(server->fscache,
- &cifs_fscache_super_index_def,
- sharename, strlen(sharename),
- &auxdata, sizeof(auxdata),
- tcon, 0, true);
+ tcon->fscache = fscache_acquire_volume(key,
+ NULL, /* preferred_cache */
+ 0 /* coherency_data */);
+ cifs_dbg(FYI, "%s: (%s/0x%p)\n", __func__, key, tcon->fscache);
+
+ kfree(key);
+out:
kfree(sharename);
- cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
- __func__, server->fscache, tcon->fscache);
}
void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
{
struct cifs_fscache_super_auxdata auxdata;
+ cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
+
memset(&auxdata, 0, sizeof(auxdata));
auxdata.resource_id = tcon->resource_id;
auxdata.vol_create_time = tcon->vol_create_time;
auxdata.vol_serial_number = tcon->vol_serial_number;
+ // TODO: Do something with the volume coherency data
- cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
- fscache_relinquish_cookie(tcon->fscache, &auxdata, false);
+ fscache_relinquish_volume(tcon->fscache,
+ 0, /* coherency_data */
+ false);
tcon->fscache = NULL;
}
-static void cifs_fscache_acquire_inode_cookie(struct cifsInodeInfo *cifsi,
- struct cifs_tcon *tcon)
+void cifs_fscache_get_inode_cookie(struct inode *inode)
{
+ struct cifsInodeInfo *cifsi = CIFS_I(inode);
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct cifs_fscache_inode_auxdata auxdata;
- memset(&auxdata, 0, sizeof(auxdata));
- auxdata.eof = cifsi->server_eof;
- auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
- auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
- auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
- auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
+ cifs_fscache_fill_auxdata(&cifsi->vfs_inode, &auxdata);
cifsi->fscache =
- fscache_acquire_cookie(tcon->fscache,
- &cifs_fscache_inode_object_def,
+ fscache_acquire_cookie(tcon->fscache, 0,
&cifsi->uniqueid, sizeof(cifsi->uniqueid),
&auxdata, sizeof(auxdata),
- cifsi, cifsi->vfs_inode.i_size, true);
+ cifsi->vfs_inode.i_size);
}
-static void cifs_fscache_enable_inode_cookie(struct inode *inode)
+void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update)
{
- struct cifsInodeInfo *cifsi = CIFS_I(inode);
- struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
- struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
-
- if (cifsi->fscache)
- return;
-
- if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE))
- return;
-
- cifs_fscache_acquire_inode_cookie(cifsi, tcon);
-
- cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n",
- __func__, tcon->fscache, cifsi->fscache);
+ if (update) {
+ struct cifs_fscache_inode_auxdata auxdata;
+ loff_t i_size = i_size_read(inode);
+
+ cifs_fscache_fill_auxdata(inode, &auxdata);
+ fscache_unuse_cookie(cifs_inode_cookie(inode), &auxdata, &i_size);
+ } else {
+ fscache_unuse_cookie(cifs_inode_cookie(inode), NULL, NULL);
+ }
}
void cifs_fscache_release_inode_cookie(struct inode *inode)
{
- struct cifs_fscache_inode_auxdata auxdata;
struct cifsInodeInfo *cifsi = CIFS_I(inode);
if (cifsi->fscache) {
- memset(&auxdata, 0, sizeof(auxdata));
- auxdata.eof = cifsi->server_eof;
- auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
- auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
- auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
- auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
-
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
- /* fscache_relinquish_cookie does not seem to update auxdata */
- fscache_update_cookie(cifsi->fscache, &auxdata);
- fscache_relinquish_cookie(cifsi->fscache, &auxdata, false);
+ fscache_relinquish_cookie(cifsi->fscache, false);
cifsi->fscache = NULL;
}
}
-void cifs_fscache_update_inode_cookie(struct inode *inode)
-{
- struct cifs_fscache_inode_auxdata auxdata;
- struct cifsInodeInfo *cifsi = CIFS_I(inode);
-
- if (cifsi->fscache) {
- memset(&auxdata, 0, sizeof(auxdata));
- auxdata.eof = cifsi->server_eof;
- auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
- auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
- auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
- auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
-
- cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
- fscache_update_cookie(cifsi->fscache, &auxdata);
- }
-}
-
-void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
-{
- cifs_fscache_enable_inode_cookie(inode);
-}
-
-void cifs_fscache_reset_inode_cookie(struct inode *inode)
-{
- struct cifsInodeInfo *cifsi = CIFS_I(inode);
- struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
- struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
- struct fscache_cookie *old = cifsi->fscache;
-
- if (cifsi->fscache) {
- /* retire the current fscache cache and get a new one */
- fscache_relinquish_cookie(cifsi->fscache, NULL, true);
-
- cifs_fscache_acquire_inode_cookie(cifsi, tcon);
- cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n",
- __func__, cifsi->fscache, old);
- }
-}
-
/*
* Retrieve a page from FS-Cache
*/
diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h
index 704c7354ace1..886a47a4c409 100644
--- a/fs/cifs/fscache.h
+++ b/fs/cifs/fscache.h
@@ -10,7 +10,7 @@
#define _CIFS_FSCACHE_H
#define FSCACHE_USE_FALLBACK_IO_API
-#include <linux/fscache_old.h>
+#include <linux/fscache.h>
#include "cifsglob.h"
@@ -33,32 +33,31 @@ struct cifs_fscache_inode_auxdata {
u64 last_change_time_sec;
u32 last_write_time_nsec;
u32 last_change_time_nsec;
- u64 eof;
};
-/*
- * cache.c
- */
-extern struct fscache_netfs cifs_fscache_netfs;
-extern const struct fscache_cookie_def cifs_fscache_server_index_def;
-extern const struct fscache_cookie_def cifs_fscache_super_index_def;
-extern const struct fscache_cookie_def cifs_fscache_inode_object_def;
-
-extern int cifs_fscache_register(void);
-extern void cifs_fscache_unregister(void);
-
/*
* fscache.c
*/
-extern void cifs_fscache_get_client_cookie(struct TCP_Server_Info *);
-extern void cifs_fscache_release_client_cookie(struct TCP_Server_Info *);
extern void cifs_fscache_get_super_cookie(struct cifs_tcon *);
extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
+extern void cifs_fscache_get_inode_cookie(struct inode *);
extern void cifs_fscache_release_inode_cookie(struct inode *);
-extern void cifs_fscache_update_inode_cookie(struct inode *inode);
-extern void cifs_fscache_set_inode_cookie(struct inode *, struct file *);
-extern void cifs_fscache_reset_inode_cookie(struct inode *);
+extern void cifs_fscache_unuse_inode_cookie(struct inode *, bool);
+
+static inline
+void cifs_fscache_fill_auxdata(struct inode *inode,
+ struct cifs_fscache_inode_auxdata *auxdata)
+{
+ struct cifsInodeInfo *cifsi = CIFS_I(inode);
+
+ memset(&auxdata, 0, sizeof(auxdata));
+ auxdata->last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
+ auxdata->last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
+ auxdata->last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
+ auxdata->last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
+}
+
extern int __cifs_readpage_from_fscache(struct inode *, struct page *);
extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
@@ -85,23 +84,13 @@ static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
}
#else /* CONFIG_CIFS_FSCACHE */
-static inline int cifs_fscache_register(void) { return 0; }
-static inline void cifs_fscache_unregister(void) {}
-
-static inline void
-cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) {}
-static inline void
-cifs_fscache_release_client_cookie(struct TCP_Server_Info *server) {}
static inline void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) {}
-static inline void
-cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
+static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
+static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
-static inline void cifs_fscache_update_inode_cookie(struct inode *inode) {}
-static inline void cifs_fscache_set_inode_cookie(struct inode *inode,
- struct file *filp) {}
-static inline void cifs_fscache_reset_inode_cookie(struct inode *inode) {}
-
+static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode) {}
+static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
static inline int
cifs_readpage_from_fscache(struct inode *inode, struct page *page)
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 82848412ad85..384d7b8686b1 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1298,10 +1298,7 @@ cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
inode->i_flags |= S_NOATIME | S_NOCMTIME;
if (inode->i_state & I_NEW) {
inode->i_ino = hash;
-#ifdef CONFIG_CIFS_FSCACHE
- /* initialize per-inode cache cookie pointer */
- CIFS_I(inode)->fscache = NULL;
-#endif
+ cifs_fscache_get_inode_cookie(inode);
unlock_new_inode(inode);
}
}
@@ -2263,6 +2260,8 @@ cifs_dentry_needs_reval(struct dentry *dentry)
int
cifs_invalidate_mapping(struct inode *inode)
{
+ struct cifs_fscache_inode_auxdata auxdata;
+ struct cifsInodeInfo *cifsi = CIFS_I(inode);
int rc = 0;
if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
@@ -2272,7 +2271,8 @@ cifs_invalidate_mapping(struct inode *inode)
__func__, inode);
}
- cifs_fscache_reset_inode_cookie(inode);
+ cifs_fscache_fill_auxdata(&cifsi->vfs_inode, &auxdata);
+ fscache_invalidate(cifs_inode_cookie(inode), &auxdata, i_size_read(inode), 0);
return rc;
}
@@ -2777,8 +2777,10 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
goto out;
if ((attrs->ia_valid & ATTR_SIZE) &&
- attrs->ia_size != i_size_read(inode))
+ attrs->ia_size != i_size_read(inode)) {
truncate_setsize(inode, attrs->ia_size);
+ fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
+ }
setattr_copy(&init_user_ns, inode, attrs);
mark_inode_dirty(inode);
@@ -2973,8 +2975,10 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
goto cifs_setattr_exit;
if ((attrs->ia_valid & ATTR_SIZE) &&
- attrs->ia_size != i_size_read(inode))
+ attrs->ia_size != i_size_read(inode)) {
truncate_setsize(inode, attrs->ia_size);
+ fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
+ }
setattr_copy(&init_user_ns, inode, attrs);
mark_inode_dirty(inode);
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 52/53] fscache, cachefiles: Display stats of no-space events
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (50 preceding siblings ...)
2021-10-22 19:10 ` [PATCH v2 51/53] cifs: Support fscache indexing rewrite (untested) David Howells
@ 2021-10-22 19:10 ` David Howells
2021-10-22 19:11 ` [PATCH v2 53/53] fscache, cachefiles: Display stat of culling events David Howells
` (2 subsequent siblings)
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:10 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add stat counters of no-space events that caused caching not to happen and
display in /proc/fs/fscache/stats.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/bind.c | 2 +-
fs/cachefiles/daemon.c | 18 +++++++++++++++---
fs/cachefiles/internal.h | 8 +++++++-
fs/cachefiles/io.c | 9 ++++++---
fs/cachefiles/namei.c | 6 ++++--
fs/fscache/stats.c | 8 ++++++++
include/linux/fscache-cache.h | 6 ++++++
7 files changed, 47 insertions(+), 10 deletions(-)
diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c
index 59c9d141f1fe..a62361e82b20 100644
--- a/fs/cachefiles/bind.c
+++ b/fs/cachefiles/bind.c
@@ -211,7 +211,7 @@ static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
pr_info("File cache on %s registered\n", cache_cookie->name);
/* check how much space the cache has */
- cachefiles_has_space(cache, 0, 0);
+ cachefiles_has_space(cache, 0, 0, cachefiles_has_space_check);
cachefiles_end_secure(cache, saved_cred);
_leave(" = 0 [%px]", cache->cache);
return 0;
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 50ec292c7213..7a7d521aeb83 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -168,7 +168,7 @@ static ssize_t cachefiles_daemon_read(struct file *file, char __user *_buffer,
return 0;
/* check how much space the cache has */
- cachefiles_has_space(cache, 0, 0);
+ cachefiles_has_space(cache, 0, 0, cachefiles_has_space_check);
/* summarise */
f_released = atomic_xchg(&cache->f_released, 0);
@@ -668,7 +668,8 @@ static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
* cache
*/
int cachefiles_has_space(struct cachefiles_cache *cache,
- unsigned fnr, unsigned bnr)
+ unsigned fnr, unsigned bnr,
+ enum cachefiles_has_space_for reason)
{
struct kstatfs stats;
int ret;
@@ -720,7 +721,7 @@ int cachefiles_has_space(struct cachefiles_cache *cache,
ret = -ENOBUFS;
if (stats.f_ffree < cache->fstop ||
stats.f_bavail < cache->bstop)
- goto begin_cull;
+ goto stop_and_begin_cull;
ret = 0;
if (stats.f_ffree < cache->fcull ||
@@ -739,6 +740,17 @@ int cachefiles_has_space(struct cachefiles_cache *cache,
//_leave(" = 0");
return 0;
+stop_and_begin_cull:
+ switch (reason) {
+ case cachefiles_has_space_for_write:
+ fscache_count_no_write_space();
+ break;
+ case cachefiles_has_space_for_create:
+ fscache_count_no_create_space();
+ break;
+ default:
+ break;
+ }
begin_cull:
if (!test_and_set_bit(CACHEFILES_CULLING, &cache->flags)) {
_debug("### CULL CACHE ###");
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index d3c7db3b058e..8d1b1347abb4 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -152,8 +152,14 @@ extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
*/
extern const struct file_operations cachefiles_daemon_fops;
+enum cachefiles_has_space_for {
+ cachefiles_has_space_check,
+ cachefiles_has_space_for_write,
+ cachefiles_has_space_for_create,
+};
extern int cachefiles_has_space(struct cachefiles_cache *cache,
- unsigned fnr, unsigned bnr);
+ unsigned fnr, unsigned bnr,
+ enum cachefiles_has_space_for reason);
/*
* error_inject.c
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 78e6ef781f73..cb531424a64f 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -461,7 +461,8 @@ static int __cachefiles_prepare_write(struct netfs_cache_resources *cres,
* space, we need to see if it's fully allocated. If it's not, we may
* want to cull it.
*/
- if (cachefiles_has_space(cache, 0, *_len / PAGE_SIZE) == 0)
+ if (cachefiles_has_space(cache, 0, *_len / PAGE_SIZE,
+ cachefiles_has_space_check) == 0)
return 0; /* Enough space to simply overwrite the whole block */
pos = cachefiles_inject_read_error();
@@ -476,6 +477,7 @@ static int __cachefiles_prepare_write(struct netfs_cache_resources *cres,
return 0; /* Fully allocated */
/* Partially allocated, but insufficient space: cull. */
+ fscache_count_no_write_space();
pos = cachefiles_inject_remove_error();
if (pos == 0)
ret = vfs_fallocate(file, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
@@ -491,7 +493,8 @@ static int __cachefiles_prepare_write(struct netfs_cache_resources *cres,
return ret;
check_space:
- return cachefiles_has_space(cache, 0, *_len / PAGE_SIZE);
+ return cachefiles_has_space(cache, 0, *_len / PAGE_SIZE,
+ cachefiles_has_space_for_write);
}
static int cachefiles_prepare_write(struct netfs_cache_resources *cres,
@@ -528,7 +531,7 @@ static int cachefiles_prepare_fallback_write(struct netfs_cache_resources *cres,
_enter("%lx", index);
- return cachefiles_has_space(cache, 0, 1);
+ return cachefiles_has_space(cache, 0, 1, cachefiles_has_space_for_write);
}
/*
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index ad87fb28b602..9b0a14e37cfa 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -309,7 +309,8 @@ static bool cachefiles_create_file(struct cachefiles_object *object)
struct file *file;
int ret;
- ret = cachefiles_has_space(object->volume->cache, 1, 0);
+ ret = cachefiles_has_space(object->volume->cache, 1, 0,
+ cachefiles_has_space_for_create);
if (ret < 0)
return false;
@@ -480,7 +481,8 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
/* we need to create the subdir if it doesn't exist yet */
if (d_is_negative(subdir)) {
if (cache->store) {
- ret = cachefiles_has_space(cache, 1, 0);
+ ret = cachefiles_has_space(cache, 1, 0,
+ cachefiles_has_space_for_create);
if (ret < 0)
goto mkdir_error;
}
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 225bba60b617..d34fb6e91d57 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -44,6 +44,10 @@ atomic_t fscache_n_read;
EXPORT_SYMBOL(fscache_n_read);
atomic_t fscache_n_write;
EXPORT_SYMBOL(fscache_n_write);
+atomic_t fscache_n_no_write_space;
+EXPORT_SYMBOL(fscache_n_no_write_space);
+atomic_t fscache_n_no_create_space;
+EXPORT_SYMBOL(fscache_n_no_create_space);
/*
* display the general statistics
@@ -86,6 +90,10 @@ int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_relinquishes_retire),
atomic_read(&fscache_n_relinquishes_dropped));
+ seq_printf(m, "NoSpace: nwr=%u ncr=%u\n",
+ atomic_read(&fscache_n_no_write_space),
+ atomic_read(&fscache_n_no_create_space));
+
seq_printf(m, "IO : rd=%u wr=%u\n",
atomic_read(&fscache_n_read),
atomic_read(&fscache_n_write));
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index d5f6b636175e..7b3225c6c22f 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -179,11 +179,17 @@ void fscache_end_operation(struct netfs_cache_resources *cres)
#ifdef CONFIG_FSCACHE_STATS
extern atomic_t fscache_n_read;
extern atomic_t fscache_n_write;
+extern atomic_t fscache_n_no_write_space;
+extern atomic_t fscache_n_no_create_space;
#define fscache_count_read() atomic_inc(&fscache_n_read)
#define fscache_count_write() atomic_inc(&fscache_n_write)
+#define fscache_count_no_write_space() atomic_inc(&fscache_n_no_write_space)
+#define fscache_count_no_create_space() atomic_inc(&fscache_n_no_create_space)
#else
#define fscache_count_read() do {} while(0)
#define fscache_count_write() do {} while(0)
+#define fscache_count_no_write_space() do {} while(0)
+#define fscache_count_no_create_space() do {} while(0)
#endif
extern struct workqueue_struct *fscache_wq;
^ permalink raw reply related [flat|nested] 58+ messages in thread* [PATCH v2 53/53] fscache, cachefiles: Display stat of culling events
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (51 preceding siblings ...)
2021-10-22 19:10 ` [PATCH v2 52/53] fscache, cachefiles: Display stats of no-space events David Howells
@ 2021-10-22 19:11 ` David Howells
2021-10-22 19:21 ` [PATCH v2 00/53] fscache: Rewrite index API and management system Linus Torvalds
2021-10-22 19:40 ` David Howells
54 siblings, 0 replies; 58+ messages in thread
From: David Howells @ 2021-10-22 19:11 UTC (permalink / raw)
To: linux-cachefs
Cc: dhowells, Trond Myklebust, Anna Schumaker, Steve French,
Dominique Martinet, Jeff Layton, Matthew Wilcox, Alexander Viro,
Omar Sandoval, Linus Torvalds, linux-afs, linux-nfs, linux-cifs,
ceph-devel, v9fs-developer, linux-fsdevel, linux-kernel
Add a stat counter of culling events whereby the cache backend culls a file
to make space (when asked by cachefilesd in this case) and display in
/proc/fs/fscache/stats.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
---
fs/cachefiles/namei.c | 1 +
fs/fscache/stats.c | 7 +++++--
include/linux/fscache-cache.h | 4 +++-
3 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 9b0a14e37cfa..a118074826cd 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -661,6 +661,7 @@ int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
goto error_unlock;
/* actually remove the victim (drops the dir mutex) */
+ fscache_count_culled();
_debug("bury");
ret = cachefiles_bury_object(cache, NULL, dir, victim,
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index d34fb6e91d57..ee1b611e365d 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -48,6 +48,8 @@ atomic_t fscache_n_no_write_space;
EXPORT_SYMBOL(fscache_n_no_write_space);
atomic_t fscache_n_no_create_space;
EXPORT_SYMBOL(fscache_n_no_create_space);
+atomic_t fscache_n_culled;
+EXPORT_SYMBOL(fscache_n_culled);
/*
* display the general statistics
@@ -90,9 +92,10 @@ int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_relinquishes_retire),
atomic_read(&fscache_n_relinquishes_dropped));
- seq_printf(m, "NoSpace: nwr=%u ncr=%u\n",
+ seq_printf(m, "NoSpace: nwr=%u ncr=%u cull=%u\n",
atomic_read(&fscache_n_no_write_space),
- atomic_read(&fscache_n_no_create_space));
+ atomic_read(&fscache_n_no_create_space),
+ atomic_read(&fscache_n_culled));
seq_printf(m, "IO : rd=%u wr=%u\n",
atomic_read(&fscache_n_read),
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 7b3225c6c22f..e12f4163af61 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -181,15 +181,17 @@ extern atomic_t fscache_n_read;
extern atomic_t fscache_n_write;
extern atomic_t fscache_n_no_write_space;
extern atomic_t fscache_n_no_create_space;
+extern atomic_t fscache_n_culled;
#define fscache_count_read() atomic_inc(&fscache_n_read)
#define fscache_count_write() atomic_inc(&fscache_n_write)
#define fscache_count_no_write_space() atomic_inc(&fscache_n_no_write_space)
#define fscache_count_no_create_space() atomic_inc(&fscache_n_no_create_space)
+#define fscache_count_culled() atomic_inc(&fscache_n_culled)
#else
#define fscache_count_read() do {} while(0)
#define fscache_count_write() do {} while(0)
#define fscache_count_no_write_space() do {} while(0)
-#define fscache_count_no_create_space() do {} while(0)
+#define fscache_count_culled() do {} while(0)
#endif
extern struct workqueue_struct *fscache_wq;
^ permalink raw reply related [flat|nested] 58+ messages in thread* Re: [PATCH v2 00/53] fscache: Rewrite index API and management system
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (52 preceding siblings ...)
2021-10-22 19:11 ` [PATCH v2 53/53] fscache, cachefiles: Display stat of culling events David Howells
@ 2021-10-22 19:21 ` Linus Torvalds
2021-10-22 19:40 ` David Howells
54 siblings, 0 replies; 58+ messages in thread
From: Linus Torvalds @ 2021-10-22 19:21 UTC (permalink / raw)
To: David Howells
Cc: linux-cachefs, linux-afs, Marc Dionne, Eric Van Hensbergen,
Matthew Wilcox (Oracle),
Dave Wysochanski, CIFS, Dominique Martinet, Steve French,
Shyam Prasad N, Jeff Layton, Anna Schumaker, open list:NFS,
SUNRPC, AND...,
Latchesar Ionkov, v9fs-developer, Trond Myklebust,
Trond Myklebust, Jeff Layton, Alexander Viro, Omar Sandoval,
ceph-devel, linux-fsdevel, Linux Kernel Mailing List
On Fri, Oct 22, 2021 at 8:58 AM David Howells <dhowells@redhat.com> wrote:
>
> David Howells (52):
> fscache_old: Move the old fscache driver to one side
> fscache_old: Rename CONFIG_FSCACHE* to CONFIG_FSCACHE_OLD*
> cachefiles_old: Move the old cachefiles driver to one side
Honestly, I don't see the point of this when it ends up just being
dead code basically immediately.
You don't actually support picking one or the other at build time,
just a hard switch-over.
That makes the old fscache driver useless. You can't say "use the old
one because I don't trust the new". You just have a legacy
implementation with no users.
Linus
^ permalink raw reply [flat|nested] 58+ messages in thread* Re: [PATCH v2 00/53] fscache: Rewrite index API and management system
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
` (53 preceding siblings ...)
2021-10-22 19:21 ` [PATCH v2 00/53] fscache: Rewrite index API and management system Linus Torvalds
@ 2021-10-22 19:40 ` David Howells
2021-10-22 19:58 ` Linus Torvalds
54 siblings, 1 reply; 58+ messages in thread
From: David Howells @ 2021-10-22 19:40 UTC (permalink / raw)
To: Linus Torvalds
Cc: dhowells, linux-cachefs, linux-afs, Marc Dionne,
Eric Van Hensbergen, Matthew Wilcox (Oracle),
Dave Wysochanski, CIFS, Dominique Martinet, Steve French,
Shyam Prasad N, Jeff Layton, Anna Schumaker, linux-nfs,
Latchesar Ionkov, v9fs-developer, Trond Myklebust,
Trond Myklebust, Jeff Layton, Alexander Viro, Omar Sandoval,
ceph-devel, linux-fsdevel, Linux Kernel Mailing List
Linus Torvalds <torvalds@linux-foundation.org> wrote:
> Honestly, I don't see the point of this when it ends up just being
> dead code basically immediately.
>
> You don't actually support picking one or the other at build time,
> just a hard switch-over.
>
> That makes the old fscache driver useless. You can't say "use the old
> one because I don't trust the new". You just have a legacy
> implementation with no users.
What's the best way to do this? Is it fine to disable caching in all the
network filesystems and then directly remove the fscache and cachefiles
drivers and replace them? It won't stop the network filesystems actually
working - it'll just mean that they don't do any caching until converted and
have caching reenabled.
David
^ permalink raw reply [flat|nested] 58+ messages in thread* Re: [PATCH v2 00/53] fscache: Rewrite index API and management system
2021-10-22 19:40 ` David Howells
@ 2021-10-22 19:58 ` Linus Torvalds
2021-10-22 20:24 ` Linus Torvalds
0 siblings, 1 reply; 58+ messages in thread
From: Linus Torvalds @ 2021-10-22 19:58 UTC (permalink / raw)
To: David Howells
Cc: linux-cachefs, linux-afs, Marc Dionne, Eric Van Hensbergen,
Matthew Wilcox (Oracle),
Dave Wysochanski, CIFS, Dominique Martinet, Steve French,
Shyam Prasad N, Jeff Layton, Anna Schumaker, open list:NFS,
SUNRPC, AND...,
Latchesar Ionkov, v9fs-developer, Trond Myklebust,
Trond Myklebust, Jeff Layton, Alexander Viro, Omar Sandoval,
ceph-devel, linux-fsdevel, Linux Kernel Mailing List
On Fri, Oct 22, 2021 at 9:40 AM David Howells <dhowells@redhat.com> wrote:
>
> What's the best way to do this? Is it fine to disable caching in all the
> network filesystems and then directly remove the fscache and cachefiles
> drivers and replace them?
So the basic issue with this whole "total rewrite" is that there's no
way to bisect anything.
And there's no way for people to say "I don't trust the rewrite, I
want to keep using the old tested model".
Which makes this all painful and generally the wrong way to do
anything like this, and there's fundamentally no "best way".
The real best way would be if the conversion could be done truly
incrementally. Flag-days simply aren't good for development, because
even if the patch to enable the new code might be some trivial
one-liner, that doesn't _help_ anything. The switch-over switches from
one code-base to another, with no help from "this is where the problem
started".
So in order of preference:
(a) actual incremental changes where the code keeps working all the
time, and no flag days
(b) same interfaces, so at least you can do A/B testing and people
can choose one or the other
(c) total rewrite
and if (c) is the thing that all the network filesystem people want,
then what the heck is the point in keeping dead code around? At that
point, all the rename crap is just extra work, extra noise, and only a
distraction. There's no upside that I can see.
Linus
^ permalink raw reply [flat|nested] 58+ messages in thread* Re: [PATCH v2 00/53] fscache: Rewrite index API and management system
2021-10-22 19:58 ` Linus Torvalds
@ 2021-10-22 20:24 ` Linus Torvalds
0 siblings, 0 replies; 58+ messages in thread
From: Linus Torvalds @ 2021-10-22 20:24 UTC (permalink / raw)
To: David Howells
Cc: linux-cachefs, linux-afs, Marc Dionne, Eric Van Hensbergen,
Matthew Wilcox (Oracle),
Dave Wysochanski, CIFS, Dominique Martinet, Steve French,
Shyam Prasad N, Jeff Layton, Anna Schumaker, open list:NFS,
SUNRPC, AND...,
Latchesar Ionkov, v9fs-developer, Trond Myklebust,
Trond Myklebust, Jeff Layton, Alexander Viro, Omar Sandoval,
ceph-devel, linux-fsdevel, Linux Kernel Mailing List
On Fri, Oct 22, 2021 at 9:58 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> and if (c) is the thing that all the network filesystem people want,
> then what the heck is the point in keeping dead code around? At that
> point, all the rename crap is just extra work, extra noise, and only a
> distraction. There's no upside that I can see.
Again, I'm not a fan of (c) as an option, but if done, then the
simplest model would appear to be:
- remove the old fscache code, obviously disabling the Kconfig for it
for each filesystem, all in one fell swoop.
- add the new fscache code (possibly preferably in sane chunks that
explains the parts).
- then do a "convert to new world order and enable" commit
individually for each filesystem
but as mentioned, there's no sane way to bisect things, or have a sane
development history in this kind of situation.
Linus
^ permalink raw reply [flat|nested] 58+ messages in thread