diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2023-06-26 16:34:25 +0300 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2023-08-12 19:02:50 +0300 |
| commit | b0504bfe1b8acdcfb5ef466581d930835ef3c49e (patch) | |
| tree | 69074291700ec64db7789139faca31b5f5d05f58 /fs/overlayfs/ovl_entry.h | |
| parent | 16aac5ad1fa94894b798dd522c5c3a6a0628d7f0 (diff) | |
ovl: add support for unique fsid per instance
The legacy behavior of ovl_statfs() reports the f_fsid filled by
underlying upper fs. This fsid is not unique among overlayfs instances
on the same upper fs.
With mount option uuid=on, generate a non-persistent uuid per overlayfs
instance and use it as the seed for f_fsid, similar to tmpfs.
This is useful for reporting fanotify events with fid info from different
instances of overlayfs over the same upper fs.
The old behavior of null uuid and upper fs fsid is retained with the
mount option uuid=null, which is the default.
The mount option uuid=off that disables uuid checks in underlying layers
also retains the legacy behavior.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Diffstat (limited to 'fs/overlayfs/ovl_entry.h')
| -rw-r--r-- | fs/overlayfs/ovl_entry.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h index 7a5196c94d75..5d03f449adb1 100644 --- a/fs/overlayfs/ovl_entry.h +++ b/fs/overlayfs/ovl_entry.h @@ -12,7 +12,7 @@ struct ovl_config { int redirect_mode; int verity_mode; bool index; - bool uuid; + int uuid; bool nfs_export; int xino; bool metacopy; |