From: David Howells <dhowells@redhat.com>
To: linux-cachefs@redhat.com
Cc: dhowells@redhat.com, Trond Myklebust <trondmy@hammerspace.com>,
Anna Schumaker <anna.schumaker@netapp.com>,
Steve French <sfrench@samba.org>,
Dominique Martinet <asmadeus@codewreck.org>,
Jeff Layton <jlayton@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Omar Sandoval <osandov@osandov.com>,
JeffleXu <jefflexu@linux.alibaba.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
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: [PATCH v4 40/68] cachefiles: Implement cache registration and withdrawal
Date: Wed, 22 Dec 2021 23:23:58 +0000 [thread overview]
Message-ID: <164021543872.640689.14370017789605073222.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <164021479106.640689.17404516570194656552.stgit@warthog.procyon.org.uk>
Do the following:
(1) Fill out cachefiles_daemon_add_cache() so that it sets up the cache
directories and registers the cache with cachefiles.
(2) Add a function to do the top-level part of cache withdrawal and
unregistration.
(3) Add a function to sync a cache.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819633175.215744.10857127598041268340.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906935445.143852.15545194974036410029.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967142904.1823006.244055483596047072.stgit@warthog.procyon.org.uk/ # v3
---
fs/cachefiles/Makefile | 1
fs/cachefiles/cache.c | 207 +++++++++++++++++++++++++++++++++++++++++++++
fs/cachefiles/daemon.c | 8 +-
fs/cachefiles/interface.c | 18 ++++
fs/cachefiles/internal.h | 9 ++
5 files changed, 240 insertions(+), 3 deletions(-)
create mode 100644 fs/cachefiles/interface.c
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index e0b092ca077f..92af5daee8ce 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -6,6 +6,7 @@
cachefiles-y := \
cache.o \
daemon.o \
+ interface.o \
main.o \
namei.o \
security.o
diff --git a/fs/cachefiles/cache.c b/fs/cachefiles/cache.c
index 73636f89eefa..0462e7af87fb 100644
--- a/fs/cachefiles/cache.c
+++ b/fs/cachefiles/cache.c
@@ -10,6 +10,166 @@
#include <linux/namei.h>
#include "internal.h"
+/*
+ * Bring a cache online.
+ */
+int cachefiles_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);
+
+ /* 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", NULL);
+ 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", NULL);
+ 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:
+ cachefiles_put_directory(cache->graveyard);
+ cache->graveyard = NULL;
+error_unsupported:
+ cachefiles_put_directory(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_relinquish_cache(cache_cookie);
+ cache->cache = NULL;
+ pr_err("Failed to register: %d\n", ret);
+ return ret;
+}
+
/*
* See if we have space for a number of pages and/or a number of files in the
* cache
@@ -101,3 +261,50 @@ int cachefiles_has_space(struct cachefiles_cache *cache,
_leave(" = %d", ret);
return ret;
}
+
+/*
+ * Sync a cache to backing disk.
+ */
+static 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);
+}
+
+/*
+ * Withdraw cache objects.
+ */
+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
+ fscache_wait_for_objects(fscache);
+
+ // PLACEHOLDER: Withdraw volume
+ cachefiles_sync_cache(cache);
+ cache->cache = NULL;
+ fscache_relinquish_cache(fscache);
+}
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 7d4691614cec..a449ee661987 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -702,6 +702,7 @@ static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
pr_warn("Cache is disabled for development\n");
return -ENOANO; // Don't allow the cache to operate yet
+ //return cachefiles_add_cache(cache);
}
/*
@@ -711,10 +712,11 @@ static void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
{
_enter("");
- if (test_bit(CACHEFILES_READY, &cache->flags)) {
- // PLACEHOLDER: Withdraw cache
- }
+ if (test_bit(CACHEFILES_READY, &cache->flags))
+ cachefiles_withdraw_cache(cache);
+ cachefiles_put_directory(cache->graveyard);
+ cachefiles_put_directory(cache->store);
mntput(cache->mnt);
kfree(cache->rootdirname);
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
new file mode 100644
index 000000000000..564ea8fa6641
--- /dev/null
+++ b/fs/cachefiles/interface.c
@@ -0,0 +1,18 @@
+// 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"
+
+const struct fscache_cache_ops cachefiles_cache_ops = {
+ .name = "cachefiles",
+};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 48768a3ab105..77e874c2bbe7 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -32,6 +32,8 @@ struct cachefiles_object {
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 */
const struct cred *cache_cred; /* security override for accessing cache */
struct mutex daemon_mutex; /* command serialisation mutex */
@@ -78,8 +80,10 @@ static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
/*
* cache.c
*/
+extern int cachefiles_add_cache(struct cachefiles_cache *cache);
extern int cachefiles_has_space(struct cachefiles_cache *cache,
unsigned fnr, unsigned bnr);
+extern void cachefiles_withdraw_cache(struct cachefiles_cache *cache);
/*
* daemon.c
@@ -125,6 +129,11 @@ 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;
+
/*
* namei.c
*/
next prev parent reply other threads:[~2021-12-22 23:24 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 23:13 [PATCH v4 00/68] fscache, cachefiles: Rewrite David Howells
2021-12-22 23:13 ` [PATCH v4 01/68] fscache, cachefiles: Disable configuration David Howells
2021-12-22 23:13 ` [PATCH v4 02/68] cachefiles: Delete the cachefiles driver pending rewrite David Howells
2021-12-22 23:14 ` [PATCH v4 03/68] fscache: Remove the contents of the fscache driver, " David Howells
2021-12-22 23:14 ` [PATCH v4 04/68] netfs: Display the netfs inode number in the netfs_read tracepoint David Howells
2021-12-22 23:14 ` [PATCH v4 05/68] netfs: Pass a flag to ->prepare_write() to say if there's no alloc'd space David Howells
2021-12-22 23:15 ` [PATCH v4 06/68] fscache: Introduce new driver David Howells
2021-12-22 23:15 ` [PATCH v4 07/68] fscache: Implement a hash function David Howells
2021-12-22 23:15 ` [PATCH v4 08/68] fscache: Implement cache registration David Howells
2021-12-22 23:15 ` [PATCH v4 09/68] fscache: Implement volume registration David Howells
2021-12-22 23:16 ` [PATCH v4 10/68] fscache: Implement cookie registration David Howells
2021-12-22 23:16 ` [PATCH v4 11/68] fscache: Implement cache-level access helpers David Howells
2021-12-22 23:16 ` [PATCH v4 12/68] fscache: Implement volume-level " David Howells
2021-12-22 23:17 ` [PATCH v4 13/68] fscache: Implement cookie-level " David Howells
2021-12-22 23:17 ` [PATCH v4 14/68] fscache: Implement functions add/remove a cache David Howells
2021-12-22 23:17 ` [PATCH v4 15/68] fscache: Provide and use cache methods to lookup/create/free a volume David Howells
2021-12-22 23:18 ` [PATCH v4 16/68] fscache: Add a function for a cache backend to note an I/O error David Howells
2021-12-22 23:18 ` [PATCH v4 17/68] fscache: Implement simple cookie state machine David Howells
2021-12-22 23:18 ` [PATCH v4 18/68] fscache: Implement cookie user counting and resource pinning David Howells
2021-12-22 23:18 ` [PATCH v4 19/68] fscache: Implement cookie invalidation David Howells
2021-12-22 23:18 ` [PATCH v4 20/68] fscache: Provide a means to begin an operation David Howells
2021-12-22 23:19 ` [PATCH v4 21/68] fscache: Count data storage objects in a cache David Howells
2021-12-22 23:19 ` [PATCH v4 22/68] fscache: Provide read/write stat counters for the cache David Howells
2021-12-22 23:19 ` [PATCH v4 23/68] fscache: Provide a function to let the netfs update its coherency data David Howells
2021-12-22 23:19 ` [PATCH v4 24/68] netfs: Pass more information on how to deal with a hole in the cache David Howells
2021-12-22 23:20 ` [PATCH v4 25/68] fscache: Implement raw I/O interface David Howells
2021-12-22 23:20 ` [PATCH v4 26/68] fscache: Implement higher-level write " David Howells
2021-12-22 23:20 ` [PATCH v4 27/68] vfs, fscache: Implement pinning of cache usage for writeback David Howells
2021-12-22 23:20 ` [PATCH v4 28/68] fscache: Provide a function to note the release of a page David Howells
2022-01-06 15:55 ` Jeff Layton
2022-01-06 16:26 ` David Howells
2021-12-22 23:21 ` [PATCH v4 29/68] fscache: Provide a function to resize a cookie David Howells
2021-12-22 23:21 ` [PATCH v4 30/68] cachefiles: Introduce rewritten driver David Howells
2021-12-22 23:21 ` [PATCH v4 31/68] cachefiles: Define structs David Howells
2021-12-22 23:22 ` [PATCH v4 32/68] cachefiles: Add some error injection support David Howells
2021-12-22 23:22 ` [PATCH v4 33/68] cachefiles: Add a couple of tracepoints for logging errors David Howells
2021-12-22 23:22 ` [PATCH v4 34/68] cachefiles: Add cache error reporting macro David Howells
2021-12-22 23:22 ` [PATCH v4 35/68] cachefiles: Add security derivation David Howells
2021-12-22 23:23 ` [PATCH v4 36/68] cachefiles: Register a miscdev and parse commands over it David Howells
2021-12-22 23:23 ` [PATCH v4 37/68] cachefiles: Provide a function to check how much space there is David Howells
2021-12-22 23:23 ` [PATCH v4 38/68] vfs, cachefiles: Mark a backing file in use with an inode flag David Howells
2022-01-06 17:04 ` Jeff Layton
2022-01-08 7:08 ` Amir Goldstein
2022-01-08 7:17 ` Matthew Wilcox
2022-01-10 7:53 ` Christoph Hellwig
2022-01-10 11:31 ` David Howells
2022-01-08 8:43 ` David Howells
2022-01-08 8:41 ` David Howells
2021-12-22 23:23 ` [PATCH v4 39/68] cachefiles: Implement a function to get/create a directory in the cache David Howells
2021-12-22 23:23 ` David Howells [this message]
2022-01-06 17:17 ` [PATCH v4 40/68] cachefiles: Implement cache registration and withdrawal Jeff Layton
2022-01-06 17:44 ` David Howells
2021-12-22 23:24 ` [PATCH v4 41/68] cachefiles: Implement volume support David Howells
2021-12-22 23:24 ` [PATCH v4 42/68] cachefiles: Add tracepoints for calls to the VFS David Howells
2021-12-22 23:24 ` [PATCH v4 43/68] cachefiles: Implement object lifecycle funcs David Howells
2021-12-22 23:24 ` [PATCH v4 44/68] cachefiles: Implement key to filename encoding David Howells
2022-01-06 17:43 ` Jeff Layton
2022-01-07 11:19 ` David Howells
2021-12-22 23:25 ` [PATCH v4 45/68] cachefiles: Implement metadata/coherency data storage in xattrs David Howells
2021-12-22 23:25 ` [PATCH v4 46/68] cachefiles: Mark a backing file in use with an inode flag David Howells
2022-01-06 18:04 ` Jeff Layton
2022-01-07 11:25 ` David Howells
2021-12-22 23:25 ` [PATCH v4 47/68] cachefiles: Implement culling daemon commands David Howells
2021-12-22 23:26 ` [PATCH v4 48/68] cachefiles: Implement backing file wrangling David Howells
2021-12-22 23:26 ` [PATCH v4 49/68] cachefiles: Implement begin and end I/O operation David Howells
2021-12-22 23:26 ` [PATCH v4 50/68] cachefiles: Implement cookie resize for truncate David Howells
2021-12-22 23:27 ` [PATCH v4 51/68] cachefiles: Implement the I/O routines David Howells
2021-12-22 23:27 ` [PATCH v4 52/68] fscache, cachefiles: Store the volume coherency data David Howells
2021-12-22 23:27 ` [PATCH v4 53/68] cachefiles: Allow cachefiles to actually function David Howells
2021-12-22 23:27 ` [PATCH v4 54/68] fscache, cachefiles: Display stats of no-space events David Howells
2021-12-22 23:27 ` [PATCH v4 55/68] fscache, cachefiles: Display stat of culling events David Howells
2021-12-22 23:28 ` [PATCH v4 56/68] afs: Convert afs to use the new fscache API David Howells
2021-12-22 23:28 ` [PATCH v4 57/68] afs: Copy local writes to the cache when writing to the server David Howells
2021-12-22 23:28 ` [PATCH v4 58/68] afs: Skip truncation on the server of data we haven't written yet David Howells
2021-12-22 23:28 ` [PATCH v4 59/68] 9p: Use fscache indexing rewrite and reenable caching David Howells
2021-12-22 23:29 ` [PATCH v4 60/68] 9p: Copy local writes to the cache when writing to the server David Howells
2021-12-22 23:29 ` [PATCH v4 61/68] nfs: Convert to new fscache volume/cookie API David Howells
2021-12-22 23:29 ` [PATCH v4 62/68] nfs: Implement cache I/O by accessing the cache directly David Howells
2021-12-22 23:29 ` [PATCH v4 63/68] cifs: Support fscache indexing rewrite (untested) David Howells
2021-12-22 23:30 ` [PATCH v4 64/68] ceph: conversion to new fscache API David Howells
2021-12-22 23:30 ` [PATCH v4 65/68] ceph: add fscache writeback support David Howells
2021-12-22 23:30 ` [PATCH v4 66/68] fscache: Rewrite documentation David Howells
2021-12-22 23:31 ` [PATCH v4 67/68] fscache: Add a tracepoint for cookie use/unuse David Howells
2021-12-22 23:31 ` [PATCH v4 68/68] 9p, afs, ceph, cifs, nfs: Use current_is_kswapd() rather than gfpflags_allow_blocking() David Howells
2022-01-04 10:50 ` [PATCH v4 00/68] fscache, cachefiles: Rewrite Jeff Layton
2022-01-04 11:27 ` David Wysochanski
2022-01-06 18:19 ` [Linux-cachefs] " Marc Dionne
2022-01-06 18:29 ` Jeff Layton
2022-01-07 21:52 ` [PATCH v4 63/68] cifs: Support fscache indexing rewrite (untested) David Howells
2022-01-09 15:27 ` Jeff Layton
2022-01-07 22:16 ` [PATCH v5 63/68] cifs: Support fscache indexing rewrite David Howells
2022-01-10 11:21 ` [PATCH v4 00/68] fscache, cachefiles: Rewrite Dominique Martinet
2022-01-12 7:20 ` [PATCH v5 63/68] cifs: Support fscache indexing rewrite David Howells
2022-01-12 21:56 ` [PATCH v6] " David Howells
2022-01-13 16:20 ` David Howells
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=164021543872.640689.14370017789605073222.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=jefflexu@linux.alibaba.com \
--cc=jlayton@kernel.org \
--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=osandov@osandov.com \
--cc=sfrench@samba.org \
--cc=torvalds@linux-foundation.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
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).