2021-11-18 08:58:08 +00:00
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2021-10-21 08:34:55 +01:00
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2021-11-18 08:58:08 +00:00
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2022-09-24 06:59:59 +02:00
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2021-11-18 08:58:08 +00:00
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2022-01-14 11:05:13 +00:00
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2021-11-18 08:58:08 +00:00
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2021-11-18 08:58:08 +00:00
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2022-09-24 06:59:59 +02:00
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2021-11-18 08:58:08 +00:00
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2022-09-24 06:59:59 +02:00
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2021-11-18 08:58:08 +00:00
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2021-11-18 08:58:08 +00:00
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2022-09-24 06:59:59 +02:00
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2021-11-18 08:58:08 +00:00
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2021-10-21 08:34:55 +01:00
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2022-03-30 17:47:59 +08:00
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2022-09-24 06:59:59 +02:00
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2022-03-30 17:47:59 +08:00
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2022-09-24 06:59:59 +02:00
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2022-03-30 17:47:59 +08:00
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2021-11-18 08:58:08 +00:00
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2022-09-24 06:59:59 +02:00
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2021-11-18 08:58:08 +00:00
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2022-09-24 06:59:59 +02:00
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2021-11-18 08:58:08 +00:00
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2021-10-21 08:34:55 +01:00
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2025-11-13 11:18:27 +11:00
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2021-10-21 08:34:55 +01:00
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2022-01-14 11:44:54 +00:00
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2021-10-21 08:34:55 +01:00
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2021-10-21 21:58:29 +01:00
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2021-10-21 08:34:55 +01:00
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2025-03-25 09:59:05 -03:00
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2025-11-13 11:18:37 +11:00
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2025-11-11 09:12:47 -05:00
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2025-11-13 11:18:37 +11:00
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2025-03-25 09:59:05 -03:00
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2025-11-13 11:18:37 +11:00
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VFS: Change vfs_mkdir() to return the dentry.
vfs_mkdir() does not guarantee to leave the child dentry hashed or make
it positive on success, and in many such cases the filesystem had to use
a different dentry which it can now return.
This patch changes vfs_mkdir() to return the dentry provided by the
filesystems which is hashed and positive when provided. This reduces
the number of cases where the resulting dentry is not positive to a
handful which don't deserve extra efforts.
The only callers of vfs_mkdir() which are interested in the resulting
inode are in-kernel filesystem clients: cachefiles, nfsd, smb/server.
The only filesystems that don't reliably provide the inode are:
- kernfs, tracefs which these clients are unlikely to be interested in
- cifs in some configurations would need to do a lookup to find the
created inode, but doesn't. cifs cannot be exported via NFS, is
unlikely to be used by cachefiles, and smb/server only has a soft
requirement for the inode, so this is unlikely to be a problem in
practice.
- hostfs, nfs, cifs may need to do a lookup (rarely for NFS) and it is
possible for a race to make that lookup fail. Actual failure
is unlikely and providing callers handle negative dentries graceful
they will fail-safe.
So this patch removes the lookup code in nfsd and smb/server and adjusts
them to fail safe if a negative dentry is provided:
- cache-files already fails safe by restarting the task from the
top - it still does with this change, though it no longer calls
cachefiles_put_directory() as that will crash if the dentry is
negative.
- nfsd reports "Server-fault" which it what it used to do if the lookup
failed. This will never happen on any file-systems that it can actually
export, so this is of no consequence. I removed the fh_update()
call as that is not needed and out-of-place. A subsequent
nfsd_create_setattr() call will call fh_update() when needed.
- smb/server only wants the inode to call ksmbd_smb_inherit_owner()
which updates ->i_uid (without calling notify_change() or similar)
which can be safely skipping on cifs (I hope).
If a different dentry is returned, the first one is put. If necessary
the fact that it is new can be determined by comparing pointers. A new
dentry will certainly have a new pointer (as the old is put after the
new is obtained).
Similarly if an error is returned (via ERR_PTR()) the original dentry is
put.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20250227013949.536172-7-neilb@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>
2025-02-27 12:32:58 +11:00
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2021-10-21 08:34:55 +01:00
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2022-01-14 11:44:54 +00:00
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2021-10-21 08:34:55 +01:00
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|
VFS: Change vfs_mkdir() to return the dentry.
vfs_mkdir() does not guarantee to leave the child dentry hashed or make
it positive on success, and in many such cases the filesystem had to use
a different dentry which it can now return.
This patch changes vfs_mkdir() to return the dentry provided by the
filesystems which is hashed and positive when provided. This reduces
the number of cases where the resulting dentry is not positive to a
handful which don't deserve extra efforts.
The only callers of vfs_mkdir() which are interested in the resulting
inode are in-kernel filesystem clients: cachefiles, nfsd, smb/server.
The only filesystems that don't reliably provide the inode are:
- kernfs, tracefs which these clients are unlikely to be interested in
- cifs in some configurations would need to do a lookup to find the
created inode, but doesn't. cifs cannot be exported via NFS, is
unlikely to be used by cachefiles, and smb/server only has a soft
requirement for the inode, so this is unlikely to be a problem in
practice.
- hostfs, nfs, cifs may need to do a lookup (rarely for NFS) and it is
possible for a race to make that lookup fail. Actual failure
is unlikely and providing callers handle negative dentries graceful
they will fail-safe.
So this patch removes the lookup code in nfsd and smb/server and adjusts
them to fail safe if a negative dentry is provided:
- cache-files already fails safe by restarting the task from the
top - it still does with this change, though it no longer calls
cachefiles_put_directory() as that will crash if the dentry is
negative.
- nfsd reports "Server-fault" which it what it used to do if the lookup
failed. This will never happen on any file-systems that it can actually
export, so this is of no consequence. I removed the fh_update()
call as that is not needed and out-of-place. A subsequent
nfsd_create_setattr() call will call fh_update() when needed.
- smb/server only wants the inode to call ksmbd_smb_inherit_owner()
which updates ->i_uid (without calling notify_change() or similar)
which can be safely skipping on cifs (I hope).
If a different dentry is returned, the first one is put. If necessary
the fact that it is new can be determined by comparing pointers. A new
dentry will certainly have a new pointer (as the old is put after the
new is obtained).
Similarly if an error is returned (via ERR_PTR()) the original dentry is
put.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20250227013949.536172-7-neilb@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>
2025-02-27 12:32:58 +11:00
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2025-11-13 11:18:37 +11:00
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2021-10-21 08:34:55 +01:00
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2025-11-13 11:18:38 +11:00
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2021-10-21 08:34:55 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:34:55 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:34:55 +01:00
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2025-11-13 11:18:37 +11:00
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2021-10-21 08:34:55 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:34:55 +01:00
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2021-10-21 08:50:10 +01:00
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2022-01-14 11:44:54 +00:00
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2021-10-21 08:50:10 +01:00
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2023-01-13 12:49:10 +01:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2025-11-13 11:18:31 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2021-10-21 08:50:10 +01:00
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2023-11-20 20:02:11 -05:00
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2021-10-21 08:50:10 +01:00
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2025-03-19 14:01:34 +11:00
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2021-10-21 08:50:10 +01:00
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2025-09-22 14:29:50 +10:00
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2025-06-13 09:28:10 +10:00
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2021-10-21 08:50:10 +01:00
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2025-06-13 09:28:10 +10:00
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2021-10-21 08:50:10 +01:00
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2022-01-14 11:44:54 +00:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:31 +11:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 07:00:00 +02:00
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cachefiles: notify the user daemon when looking up cookie
Fscache/CacheFiles used to serve as a local cache for a remote
networking fs. A new on-demand read mode will be introduced for
CacheFiles, which can boost the scenario where on-demand read semantics
are needed, e.g. container image distribution.
The essential difference between these two modes is seen when a cache
miss occurs: In the original mode, the netfs will fetch the data from
the remote server and then write it to the cache file; in on-demand
read mode, fetching the data and writing it into the cache is delegated
to a user daemon.
As the first step, notify the user daemon when looking up cookie. In
this case, an anonymous fd is sent to the user daemon, through which the
user daemon can write the fetched data to the cache file. Since the user
daemon may move the anonymous fd around, e.g. through dup(), an object
ID uniquely identifying the cache file is also attached.
Also add one advisory flag (FSCACHE_ADV_WANT_CACHE_SIZE) suggesting that
the cache file size shall be retrieved at runtime. This helps the
scenario where one cache file contains multiple netfs files, e.g. for
the purpose of deduplication. In this case, netfs itself has no idea the
size of the cache file, whilst the user daemon should give the hint on
it.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-3-jefflexu@linux.alibaba.com
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
2022-04-25 20:21:24 +08:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2023-06-26 10:14:36 -07:00
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2023-06-15 14:22:25 +03:00
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2022-09-24 07:00:00 +02:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 07:00:00 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2022-09-24 07:00:00 +02:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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cachefiles: notify the user daemon when looking up cookie
Fscache/CacheFiles used to serve as a local cache for a remote
networking fs. A new on-demand read mode will be introduced for
CacheFiles, which can boost the scenario where on-demand read semantics
are needed, e.g. container image distribution.
The essential difference between these two modes is seen when a cache
miss occurs: In the original mode, the netfs will fetch the data from
the remote server and then write it to the cache file; in on-demand
read mode, fetching the data and writing it into the cache is delegated
to a user daemon.
As the first step, notify the user daemon when looking up cookie. In
this case, an anonymous fd is sent to the user daemon, through which the
user daemon can write the fetched data to the cache file. Since the user
daemon may move the anonymous fd around, e.g. through dup(), an object
ID uniquely identifying the cache file is also attached.
Also add one advisory flag (FSCACHE_ADV_WANT_CACHE_SIZE) suggesting that
the cache file size shall be retrieved at runtime. This helps the
scenario where one cache file contains multiple netfs files, e.g. for
the purpose of deduplication. In this case, netfs itself has no idea the
size of the cache file, whilst the user daemon should give the hint on
it.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-3-jefflexu@linux.alibaba.com
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
2022-04-25 20:21:24 +08:00
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2022-09-24 06:59:59 +02:00
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|
cachefiles: notify the user daemon when looking up cookie
Fscache/CacheFiles used to serve as a local cache for a remote
networking fs. A new on-demand read mode will be introduced for
CacheFiles, which can boost the scenario where on-demand read semantics
are needed, e.g. container image distribution.
The essential difference between these two modes is seen when a cache
miss occurs: In the original mode, the netfs will fetch the data from
the remote server and then write it to the cache file; in on-demand
read mode, fetching the data and writing it into the cache is delegated
to a user daemon.
As the first step, notify the user daemon when looking up cookie. In
this case, an anonymous fd is sent to the user daemon, through which the
user daemon can write the fetched data to the cache file. Since the user
daemon may move the anonymous fd around, e.g. through dup(), an object
ID uniquely identifying the cache file is also attached.
Also add one advisory flag (FSCACHE_ADV_WANT_CACHE_SIZE) suggesting that
the cache file size shall be retrieved at runtime. This helps the
scenario where one cache file contains multiple netfs files, e.g. for
the purpose of deduplication. In this case, netfs itself has no idea the
size of the cache file, whilst the user daemon should give the hint on
it.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-3-jefflexu@linux.alibaba.com
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
2022-04-25 20:21:24 +08:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 07:00:00 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 07:00:00 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 07:00:00 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2022-09-24 07:00:00 +02:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2021-10-21 21:58:29 +01:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2024-01-20 06:24:55 -05:00
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2021-10-21 08:50:10 +01:00
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cachefiles: notify the user daemon when looking up cookie
Fscache/CacheFiles used to serve as a local cache for a remote
networking fs. A new on-demand read mode will be introduced for
CacheFiles, which can boost the scenario where on-demand read semantics
are needed, e.g. container image distribution.
The essential difference between these two modes is seen when a cache
miss occurs: In the original mode, the netfs will fetch the data from
the remote server and then write it to the cache file; in on-demand
read mode, fetching the data and writing it into the cache is delegated
to a user daemon.
As the first step, notify the user daemon when looking up cookie. In
this case, an anonymous fd is sent to the user daemon, through which the
user daemon can write the fetched data to the cache file. Since the user
daemon may move the anonymous fd around, e.g. through dup(), an object
ID uniquely identifying the cache file is also attached.
Also add one advisory flag (FSCACHE_ADV_WANT_CACHE_SIZE) suggesting that
the cache file size shall be retrieved at runtime. This helps the
scenario where one cache file contains multiple netfs files, e.g. for
the purpose of deduplication. In this case, netfs itself has no idea the
size of the cache file, whilst the user daemon should give the hint on
it.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-3-jefflexu@linux.alibaba.com
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
2022-04-25 20:21:24 +08:00
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2021-10-21 08:50:10 +01:00
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mm, netfs, fscache: stop read optimisation when folio removed from pagecache
Fscache has an optimisation by which reads from the cache are skipped
until we know that (a) there's data there to be read and (b) that data
isn't entirely covered by pages resident in the netfs pagecache. This is
done with two flags manipulated by fscache_note_page_release():
if (...
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);
where the NO_DATA_TO_READ flag causes cachefiles_prepare_read() to
indicate that netfslib should download from the server or clear the page
instead.
The fscache_note_page_release() function is intended to be called from
->releasepage() - but that only gets called if PG_private or PG_private_2
is set - and currently the former is at the discretion of the network
filesystem and the latter is only set whilst a page is being written to
the cache, so sometimes we miss clearing the optimisation.
Fix this by following Willy's suggestion[1] and adding an address_space
flag, AS_RELEASE_ALWAYS, that causes filemap_release_folio() to always call
->release_folio() if it's set, even if PG_private or PG_private_2 aren't
set.
Note that this would require folio_test_private() and page_has_private() to
become more complicated. To avoid that, in the places[*] where these are
used to conditionalise calls to filemap_release_folio() and
try_to_release_page(), the tests are removed the those functions just
jumped to unconditionally and the test is performed there.
[*] There are some exceptions in vmscan.c where the check guards more than
just a call to the releaser. I've added a function, folio_needs_release()
to wrap all the checks for that.
AS_RELEASE_ALWAYS should be set if a non-NULL cookie is obtained from
fscache and cleared in ->evict_inode() before truncate_inode_pages_final()
is called.
Additionally, the FSCACHE_COOKIE_NO_DATA_TO_READ flag needs to be cleared
and the optimisation cancelled if a cachefiles object already contains data
when we open it.
[dwysocha@redhat.com: call folio_mapping() inside folio_needs_release()]
Link: https://github.com/DaveWysochanskiRH/kernel/commit/902c990e311120179fa5de99d68364b2947b79ec
Link: https://lkml.kernel.org/r/20230628104852.3391651-3-dhowells@redhat.com
Fixes: 1f67e6d0b188 ("fscache: Provide a function to note the release of a page")
Fixes: 047487c947e8 ("cachefiles: Implement the I/O routines")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Reported-by: Rohith Surabattula <rohiths.msft@gmail.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Tested-by: SeongJae Park <sj@kernel.org>
Cc: Daire Byrne <daire.byrne@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Steve French <sfrench@samba.org>
Cc: Shyam Prasad N <nspmangalore@gmail.com>
Cc: Rohith Surabattula <rohiths.msft@gmail.com>
Cc: Dave Wysochanski <dwysocha@redhat.com>
Cc: Dominique Martinet <asmadeus@codewreck.org>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Jingbo Xu <jefflexu@linux.alibaba.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-06-28 11:48:52 +01:00
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2021-10-21 08:50:10 +01:00
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2022-03-30 17:47:59 +08:00
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2021-10-21 08:50:10 +01:00
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2022-03-30 17:47:59 +08:00
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2021-10-21 08:50:10 +01:00
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2022-09-24 06:59:59 +02:00
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2021-10-21 08:50:10 +01:00
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2025-03-19 14:01:34 +11:00
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2021-10-21 08:50:10 +01:00
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2022-01-14 11:44:54 +00:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:31 +11:00
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2021-10-21 08:50:10 +01:00
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2024-08-29 16:34:09 +08:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:27 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:27 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:27 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:27 +11:00
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2025-11-13 11:18:37 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:27 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:27 +11:00
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2021-10-21 08:50:10 +01:00
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2023-01-13 12:49:10 +01:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:27 +11:00
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2025-11-13 11:18:37 +11:00
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2025-11-13 11:18:27 +11:00
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2021-10-21 08:50:10 +01:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2021-10-21 08:50:10 +01:00
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2021-10-22 09:17:58 +01:00
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2021-10-21 08:50:10 +01:00
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2025-11-13 11:18:28 +11:00
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2021-10-21 08:50:10 +01:00
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