diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2026-01-20 15:58:31 +0100 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2026-02-06 13:48:23 +0100 |
| commit | 869056dbbd636f8f256b695f39c102eb3ce2edd0 (patch) | |
| tree | 55cc6687fe5806b44f21bac26caa10e3130bc524 /Documentation | |
| parent | fcb70a56f4d81450114034b2c61f48ce7444a0e2 (diff) | |
ovl: relax requirement for uuid=off,index=on
uuid=off,index=on required that all upper/lower directories are on the
same filesystem.
Relax the requirement so that only all the lower directories need to be
on the same filesystem.
Reported-by: André Almeida <andrealmeid@igalia.com>
Link: https://lore.kernel.org/r/20260114-tonyk-get_disk_uuid-v1-3-e6a319e25d57@igalia.com/
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/overlayfs.rst | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst index ab989807a2cb..af5a69f87da4 100644 --- a/Documentation/filesystems/overlayfs.rst +++ b/Documentation/filesystems/overlayfs.rst @@ -753,9 +753,9 @@ Note: the mount options index=off,nfs_export=on are conflicting for a read-write mount and will result in an error. Note: the mount option uuid=off can be used to replace UUID of the underlying -filesystem in file handles with null, and effectively disable UUID checks. This +filesystem in file handles with null, in order to relax the UUID checks. This can be useful in case the underlying disk is copied and the UUID of this copy -is changed. This is only applicable if all lower/upper/work directories are on +is changed. This is only applicable if all lower directories are on the same filesystem, otherwise it will fallback to normal behaviour. @@ -769,7 +769,7 @@ controlled by the "uuid" mount option, which supports these values: UUID of overlayfs is null. fsid is taken from upper most filesystem. - "off": UUID of overlayfs is null. fsid is taken from upper most filesystem. - UUID of underlying layers is ignored. + UUID of underlying layers is ignored and null used instead. - "on": UUID of overlayfs is generated and used to report a unique fsid. UUID is stored in xattr "trusted.overlay.uuid", making overlayfs fsid |