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| author | Amir Goldstein <amir73il@gmail.com> | 2021-03-22 18:39:44 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2021-04-19 16:03:48 +0200 |
| commit | 59cda49ecf6c9a32fae4942420701b6e087204f6 (patch) | |
| tree | 8a24983b9d5074a44a9ae419904de8b3dbb4f27e /mm | |
| parent | fs: introduce a wrapper uuid_to_fsid() (diff) | |
| download | linux-59cda49ecf6c9a32fae4942420701b6e087204f6.tar.xz linux-59cda49ecf6c9a32fae4942420701b6e087204f6.zip | |
shmem: allow reporting fanotify events with file handles on tmpfs
Since kernel v5.1, fanotify_init(2) supports the flag FAN_REPORT_FID
for identifying objects using file handle and fsid in events.
fanotify_mark(2) fails with -ENODEV when trying to set a mark on
filesystems that report null f_fsid in stasfs(2).
Use the digest of uuid as f_fsid for tmpfs to uniquely identify tmpfs
objects as best as possible and allow setting an fanotify mark that
reports events with file handles on tmpfs.
Link: https://lore.kernel.org/r/20210322173944.449469-3-amir73il@gmail.com
Acked-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/shmem.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index b2db4ed0fbc7..162d8f8993bb 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2846,6 +2846,9 @@ static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf) buf->f_ffree = sbinfo->free_inodes; } /* else leave those fields 0 like simple_statfs */ + + buf->f_fsid = uuid_to_fsid(dentry->d_sb->s_uuid.b); + return 0; } |