From: David Howells <dhowells@redhat.com>
To: Trond Myklebust <trondmy@hammerspace.com>,
Anna Schumaker <anna.schumaker@netapp.com>,
Steve French <sfrench@samba.org>,
Dominique Martinet <asmadeus@codewreck.org>
Cc: dhowells@redhat.com, Jeff Layton <jlayton@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-cachefs@redhat.com, linux-afs@lists.infradead.org,
linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 44/76] cachefiles: Implement read and write parts of new I/O API
Date: Fri, 20 Nov 2020 15:12:02 +0000 [thread overview]
Message-ID: <160588512294.3465195.3303829406395432321.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk>
Implement writing into the cache and reading back from the cache inside
cachefiles using asynchronous direct I/O from the specified iterator. The
size and position of the request should be aligned to the reported
dio_block_size.
Errors and completion are reported by callback.
Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/cachefiles/interface.c | 20 ++-
fs/cachefiles/internal.h | 2
fs/cachefiles/io.c | 270 ++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 277 insertions(+), 15 deletions(-)
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 0e3d5b5ffc55..c14e2b4f5b24 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -12,8 +12,6 @@
#include "internal.h"
static int cachefiles_attr_changed(struct cachefiles_object *object);
-static void cachefiles_put_object(struct fscache_object *_object,
- enum fscache_obj_ref_trace why);
/*
* Allocate an object record for a cookie lookup and prepare the lookup data.
@@ -160,7 +158,8 @@ static void cachefiles_update_object(struct fscache_object *_object)
struct cachefiles_object *object;
struct cachefiles_cache *cache;
const struct cred *saved_cred;
- loff_t object_size;
+ struct inode *inode;
+ loff_t object_size, i_size;
int ret;
_enter("{OBJ%x}", _object->debug_id);
@@ -172,12 +171,14 @@ static void cachefiles_update_object(struct fscache_object *_object)
cachefiles_begin_secure(cache, &saved_cred);
object_size = object->fscache.cookie->object_size;
- if (i_size_read(d_inode(object->dentry)) > object_size) {
+ inode = d_inode(object->dentry);
+ i_size = i_size_read(inode);
+ if (i_size > object_size) {
struct path path = {
.mnt = cache->mnt,
.dentry = object->dentry
};
- _debug("trunc %llx -> %llx", i_size_read(d_inode(object->dentry)), object_size);
+ _debug("trunc %llx -> %llx", i_size, object_size);
ret = vfs_truncate(&path, object_size);
if (ret < 0) {
cachefiles_io_error_obj(object, "Trunc-to-size failed");
@@ -186,8 +187,9 @@ static void cachefiles_update_object(struct fscache_object *_object)
}
object_size = round_up(object_size, CACHEFILES_DIO_BLOCK_SIZE);
- _debug("trunc %llx -> %llx", i_size_read(d_inode(object->dentry)), object_size);
- if (i_size_read(d_inode(object->dentry)) < object_size) {
+ i_size = i_size_read(inode);
+ _debug("trunc %llx -> %llx", i_size, object_size);
+ if (i_size < object_size) {
ret = vfs_truncate(&path, object_size);
if (ret < 0) {
cachefiles_io_error_obj(object, "Trunc-to-dio-size failed");
@@ -283,8 +285,8 @@ static void cachefiles_drop_object(struct fscache_object *_object,
/*
* dispose of a reference to an object
*/
-static void cachefiles_put_object(struct fscache_object *_object,
- enum fscache_obj_ref_trace why)
+void cachefiles_put_object(struct fscache_object *_object,
+ enum fscache_obj_ref_trace why)
{
struct cachefiles_object *object;
struct fscache_cache *cache;
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index e9f45d5053b1..24a8aed2600d 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -150,6 +150,8 @@ extern int cachefiles_has_space(struct cachefiles_cache *cache,
extern const struct fscache_cache_ops cachefiles_cache_ops;
extern struct fscache_object *cachefiles_grab_object(struct fscache_object *_object,
enum fscache_obj_ref_trace why);
+extern void cachefiles_put_object(struct fscache_object *_object,
+ enum fscache_obj_ref_trace why);
/*
* io.c
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index bf1930699636..4c66b9183dd6 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -10,9 +10,52 @@
#include <linux/file.h>
#include <linux/uio.h>
#include <linux/xattr.h>
+#include <linux/sched/mm.h>
#include "internal.h"
#include <trace/events/fscache.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;
+ fscache_io_terminated_t term_func;
+ void *term_func_priv;
+};
+
+static inline void cachefiles_put_kiocb(struct cachefiles_kiocb *ki)
+{
+ if (refcount_dec_and_test(&ki->ki_refcnt)) {
+ cachefiles_put_object(&ki->object->fscache, fscache_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);
+
+ _enter("%ld,%ld", ret, ret2);
+
+ if (ki->term_func) {
+ if (ret < 0)
+ ki->term_func(ki->term_func_priv, ret);
+ else
+ ki->term_func(ki->term_func_priv, ki->skipped + ret);
+ }
+
+ fscache_uncount_io_operation(ki->object->fscache.cookie);
+ cachefiles_put_kiocb(ki);
+}
+
/*
* Initiate a read from the cache.
*/
@@ -23,11 +66,142 @@ int cachefiles_read(struct fscache_op_resources *opr,
fscache_io_terminated_t term_func,
void *term_func_priv)
{
- fscache_wait_for_operation(opr, FSCACHE_WANT_READ);
+ struct cachefiles_object *object =
+ container_of(opr->object, struct cachefiles_object, fscache);
+ struct cachefiles_kiocb *ki;
+ struct file *file;
+ unsigned int old_nofs;
+ ssize_t ret = -ENOBUFS;
+ size_t len = iov_iter_count(iter), skipped = 0;
+
+ spin_lock(&object->fscache.lock);
+ file = get_file(object->backing_file);
+ spin_unlock(&object->fscache.lock);
+
+ _enter("%pD,%li,%llx,%zx/%llx",
+ file, file_inode(file)->i_ino, start_pos, len,
+ i_size_read(file->f_inode));
+
+ __fscache_wait_for_operation(opr, FSCACHE_WANT_READ);
fscache_count_io_operation(opr->object->cookie);
+
+ /* 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 (seek_data) {
+ 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.
+ */
+ iov_iter_zero(len, iter);
+ skipped = len;
+ fscache_uncount_io_operation(object->fscache.cookie);
+ 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->object = object;
+ ki->term_func = term_func;
+ ki->term_func_priv = term_func_priv;
+
+ if (ki->term_func)
+ ki->iocb.ki_complete = cachefiles_read_complete;
+
+ ret = rw_verify_area(READ, file, &ki->iocb.ki_pos, len - skipped);
+ if (ret < 0)
+ goto presubmission_error_free;
+
+ cachefiles_grab_object(&object->fscache, fscache_obj_get_ioreq);
+
+ old_nofs = memalloc_nofs_save();
+ ret = call_read_iter(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:
+ 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_free:
+ kfree(ki);
+presubmission_error:
+ fput(file);
if (term_func)
- term_func(term_func_priv, -ENODATA);
- return -ENODATA;
+ term_func(term_func_priv, ret < 0 ? ret : skipped);
+ 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) {
+ if (ki->term_func)
+ ki->term_func(ki->term_func_priv, ret);
+ } else {
+ if (ret == ki->len)
+ cachefiles_mark_content_map(ki->object, ki->start, ki->len);
+ if (ki->term_func)
+ ki->term_func(ki->term_func_priv, ret);
+ }
+
+ fscache_uncount_io_operation(ki->object->fscache.cookie);
+ cachefiles_put_kiocb(ki);
}
/*
@@ -39,11 +213,95 @@ int cachefiles_write(struct fscache_op_resources *opr,
fscache_io_terminated_t term_func,
void *term_func_priv)
{
- fscache_wait_for_operation(opr, FSCACHE_WANT_WRITE);
+ struct cachefiles_object *object =
+ container_of(opr->object, struct cachefiles_object, fscache);
+ 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);
+
+ spin_lock(&object->fscache.lock);
+ file = get_file(object->backing_file);
+ spin_unlock(&object->fscache.lock);
+
+ _enter("%pD,%li,%llx,%zx/%llx",
+ file, file_inode(file)->i_ino, start_pos, len,
+ i_size_read(file->f_inode));
+
+ __fscache_wait_for_operation(opr, FSCACHE_WANT_WRITE);
fscache_count_io_operation(opr->object->cookie);
+
+ 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->object = object;
+ ki->term_func = term_func;
+ ki->term_func_priv = term_func_priv;
+
+ if (ki->term_func)
+ ki->iocb.ki_complete = cachefiles_write_complete;
+
+ ret = rw_verify_area(WRITE, file, &ki->iocb.ki_pos, iov_iter_count(iter));
+ if (ret < 0)
+ goto presubmission_error_free;
+
+ /* 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);
+
+ cachefiles_grab_object(&object->fscache, fscache_obj_get_ioreq);
+
+ old_nofs = memalloc_nofs_save();
+ ret = call_write_iter(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;
+ /* Fall through */
+ default:
+ 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_free:
+ kfree(ki);
+presubmission_error:
+ fput(file);
if (term_func)
- term_func(term_func_priv, -ENOBUFS);
- return -ENOBUFS;
+ term_func(term_func_priv, -ENOMEM);
+ return -ENOMEM;
}
/*
next prev parent reply other threads:[~2020-11-20 15:12 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 15:02 [RFC PATCH 00/76] fscache: Modernisation David Howells
2020-11-20 15:02 ` [RFC PATCH 01/76] nfs, cifs, ceph, 9p: Disable use of fscache prior to its rewrite David Howells
2020-11-20 15:02 ` [RFC PATCH 02/76] afs: Disable use of the fscache I/O routines David Howells
2020-11-20 15:03 ` [RFC PATCH 03/76] fscache: Add a cookie debug ID and use that in traces David Howells
2020-11-20 15:03 ` [RFC PATCH 04/76] fscache: Procfile to display cookies David Howells
2020-11-20 15:03 ` [RFC PATCH 05/76] fscache: Remove the old I/O API David Howells
2020-11-20 15:03 ` [RFC PATCH 06/76] fscache: Remove the netfs data from the cookie David Howells
2020-11-20 15:04 ` [RFC PATCH 07/76] fscache: Remove struct fscache_cookie_def David Howells
2020-11-20 15:04 ` [RFC PATCH 08/76] fscache: Remove store_limit* from struct fscache_object David Howells
2020-11-20 15:04 ` [RFC PATCH 09/76] fscache: Remove fscache_check_consistency() David Howells
2020-11-20 15:04 ` [RFC PATCH 10/76] fscache: Remove fscache_attr_changed() David Howells
2020-11-20 15:04 ` [RFC PATCH 11/76] fscache: Remove obsolete stats David Howells
2020-11-20 15:05 ` [RFC PATCH 12/76] fscache: Remove old I/O tracepoints David Howells
2020-11-20 15:05 ` [RFC PATCH 13/76] fscache: Temporarily disable fscache_invalidate() David Howells
2020-11-20 15:05 ` [RFC PATCH 14/76] fscache: Remove the I/O operation manager David Howells
2020-11-20 15:05 ` [RFC PATCH 15/76] fscache: Change %p in format strings to something else David Howells
2020-11-20 15:06 ` [RFC PATCH 16/76] cachefiles: " David Howells
2020-11-20 15:06 ` [RFC PATCH 17/76] iov_iter: Add ITER_XARRAY David Howells
2020-11-20 15:06 ` [RFC PATCH 18/76] vm: Add wait/unlock functions for PG_fscache David Howells
2020-11-20 15:06 ` [RFC PATCH 19/76] mm: Implement readahead_control pageset expansion David Howells
2020-11-20 15:06 ` [RFC PATCH 20/76] mm: Stop generic_file_buffered_read() from grabbing a superfluous page David Howells
2020-11-20 15:07 ` [RFC PATCH 21/76] vfs: Export rw_verify_area() for use by cachefiles David Howells
2020-11-20 15:07 ` [RFC PATCH 22/76] vfs: Provide S_CACHE_FILE inode flag David Howells
2020-11-20 15:07 ` [RFC PATCH 23/76] cachefiles: Remove tree of active files and use " David Howells
2020-11-20 15:07 ` [RFC PATCH 24/76] fscache: Provide a simple thread pool for running ops asynchronously David Howells
2020-11-20 15:08 ` [RFC PATCH 26/76] fscache: Rewrite the I/O API based on iov_iter David Howells
2020-11-20 15:08 ` [RFC PATCH 27/76] fscache: Keep track of size of a file last set independently on the server David Howells
2020-11-20 15:08 ` [RFC PATCH 28/76] fscache, cachefiles: Fix disabled histogram warnings David Howells
2020-11-20 15:08 ` [RFC PATCH 29/76] fscache: Recast assertion in terms of cookie not being an index David Howells
2020-11-20 15:08 ` [RFC PATCH 30/76] vfs, fscache: Force ->write_inode() to occur if cookie pinned for writeback David Howells
2020-11-20 15:09 ` [RFC PATCH 31/76] fscache: Allow ->put_super() to be used to wait for cache operations David Howells
2020-11-20 15:09 ` [RFC PATCH 32/76] netfs: Make a netfs helper module David Howells
2020-11-20 15:09 ` [RFC PATCH 33/76] netfs: Provide readahead and readpage netfs helpers David Howells
2020-11-20 15:09 ` [RFC PATCH 34/76] netfs: Use the cache David Howells
2020-11-20 15:10 ` [RFC PATCH 35/76] fscache: read-helper: Add tracepoints David Howells
2020-11-20 15:10 ` [RFC PATCH 36/76] cachefiles: Remove some redundant checks on unsigned values David Howells
2020-11-20 15:10 ` [RFC PATCH 37/76] cachefiles: trace: Log coherency checks David Howells
2020-11-20 15:10 ` [RFC PATCH 38/76] cachefiles: Split cachefiles_drop_object() up a bit David Howells
2020-11-20 15:11 ` [RFC PATCH 39/76] cachefiles: Implement new fscache I/O backend API David Howells
2020-11-20 15:11 ` [RFC PATCH 40/76] cachefiles: Merge object->backer into object->dentry David Howells
2020-11-20 15:11 ` [RFC PATCH 41/76] cachefiles: Implement a content-present indicator and bitmap David Howells
2020-11-20 15:11 ` [RFC PATCH 42/76] cachefiles: Shape requests from the fscache read helper David Howells
2020-11-20 15:11 ` [RFC PATCH 43/76] cachefiles: Round the cachefile size up to DIO block size David Howells
2020-11-20 15:12 ` David Howells [this message]
2020-11-20 15:12 ` [RFC PATCH 45/76] cachefiles: Add I/O tracepoints David Howells
2020-11-20 15:12 ` [RFC PATCH 46/76] fscache: Display cache-specific data in /proc/fs/fscache/objects David Howells
2020-11-20 15:12 ` [RFC PATCH 47/76] fscache: Remove more obsolete stats David Howells
2020-11-20 15:12 ` [RFC PATCH 48/76] fscache: Always create /proc/fs/fscache/stats if configured David Howells
2020-11-20 15:13 ` [RFC PATCH 49/76] netfs: Stats David Howells
2020-11-20 15:13 ` [RFC PATCH 50/76] fscache: New stats David Howells
2020-11-20 15:13 ` [RFC PATCH 51/76] fscache, cachefiles: Rewrite invalidation David Howells
2020-11-20 15:13 ` [RFC PATCH 52/76] fscache: disable cookie when doing an invalidation for DIO write David Howells
2020-11-20 15:13 ` [RFC PATCH 53/76] fscache: Implement "will_modify" parameter on fscache_use_cookie() David Howells
2020-11-20 15:14 ` [RFC PATCH 54/76] fscache: Provide resize operation David Howells
2020-11-20 15:14 ` [RFC PATCH 55/76] fscache: Remove the update operation David Howells
2020-11-20 15:14 ` [RFC PATCH 56/76] afs: Pass page into dirty region helpers to provide THP size David Howells
2020-11-20 15:14 ` [RFC PATCH 57/76] afs: Print the operation debug_id when logging an unexpected data version David Howells
2020-11-20 15:14 ` [RFC PATCH 58/76] afs: Move key to afs_read struct David Howells
2020-11-20 15:15 ` [RFC PATCH 59/76] afs: Don't truncate iter during data fetch David Howells
2020-11-20 15:15 ` [RFC PATCH 60/76] afs: Log remote unmarshalling errors David Howells
2020-11-20 15:15 ` [RFC PATCH 61/76] afs: Set up the iov_iter before calling afs_extract_data() David Howells
2020-11-20 15:15 ` [RFC PATCH 62/76] afs: Use ITER_XARRAY for writing David Howells
2020-11-20 15:16 ` [RFC PATCH 63/76] afs: Wait on PG_fscache before modifying/releasing a page David Howells
2020-11-20 15:16 ` [RFC PATCH 64/76] afs: Extract writeback extension into its own function David Howells
2020-11-20 15:16 ` [RFC PATCH 65/76] afs: Prepare for use of THPs David Howells
2020-11-20 15:16 ` [RFC PATCH 66/76] afs: Use the fs operation ops to handle FetchData completion David Howells
2020-11-20 15:17 ` [RFC PATCH 67/76] afs: Use new fscache read helper API David Howells
2020-11-20 15:17 ` [RFC PATCH 68/76] netfs: Add write_begin helper David Howells
2020-11-20 15:17 ` [RFC PATCH 69/76] fscache: Add support for writing to the cache David Howells
2020-11-20 15:17 ` [RFC PATCH 70/76] afs: Use the fscache_write_begin() helper David Howells
2020-11-20 15:18 ` [RFC PATCH 71/76] afs: Copy local writes to the cache when writing to the server David Howells
2020-11-20 15:18 ` [RFC PATCH 72/76] afs: Invoke fscache_resize_cookie() when handling ATTR_SIZE for setattr David Howells
2020-11-20 15:18 ` [RFC PATCH 73/76] afs: Add O_DIRECT read support David Howells
2020-11-20 15:18 ` [RFC PATCH 74/76] afs: Skip truncation on the server of data we haven't written yet David Howells
2020-11-20 15:19 ` [RFC PATCH 75/76] afs: Make afs_write_begin() return the THP subpage David Howells
2020-11-20 15:19 ` [RFC PATCH 76/76] afs: Fix speculative status fetch going out of order wrt to modifications David Howells
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--in-reply-to=160588512294.3465195.3303829406395432321.stgit@warthog.procyon.org.uk \
--to=dhowells@redhat.com \
--cc=anna.schumaker@netapp.com \
--cc=asmadeus@codewreck.org \
--cc=ceph-devel@vger.kernel.org \
--cc=jlayton@redhat.com \
--cc=linux-afs@lists.infradead.org \
--cc=linux-cachefs@redhat.com \
--cc=linux-cifs@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nfs@vger.kernel.org \
--cc=sfrench@samba.org \
--cc=trondmy@hammerspace.com \
--cc=v9fs-developer@lists.sourceforge.net \
--cc=viro@zeniv.linux.org.uk \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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