linux/fs/overlayfs
Amir Goldstein ffb24e3c65 ovl: relax lookup error on mismatch origin ftype
We get occasional reports of lookup errors due to mismatched
origin ftype from users that re-format a lower squashfs image.

Commit 13c6ad0f45 ("ovl: document lower modification caveats")
tries to discourage the practice of re-formating lower layers and
describes the expected behavior as undefined.

Commit b0e0f69731 ("ovl: restrict lower null uuid for "xino=auto"")
limits the configurations in which origin file handles are followed.

In addition to these measures, change the behavior in case of detecting
a mismatch origin ftype in lookup to issue a warning, not follow origin,
but not fail the lookup operation either.

That should make overall more users happy without any big consequences.

Link: https://lore.kernel.org/linux-unionfs/CAOQ4uxgPq9E9xxwU2CDyHy-_yCZZeymg+3n+-6AqkGGE1YtwvQ@mail.gmail.com/
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2021-08-17 11:47:44 +02:00
..
copy_up.c ovl: consistent behavior for immutable/append-only inodes 2021-08-17 11:47:43 +02:00
dir.c ovl: do not set overlay.opaque for new directories 2021-08-17 11:47:44 +02:00
export.c ovl: fix uninitialized pointer read in ovl_lookup_real_one() 2021-08-10 10:21:30 +02:00
file.c ovl: fix deadlock in splice write 2021-08-10 10:21:30 +02:00
inode.c ovl: consistent behavior for immutable/append-only inodes 2021-08-17 11:47:43 +02:00
Kconfig docs: fix broken references to text files 2020-04-20 15:35:59 -06:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
namei.c ovl: relax lookup error on mismatch origin ftype 2021-08-17 11:47:44 +02:00
overlayfs.h ovl: add ovl_allow_offline_changes() helper 2021-08-17 11:47:44 +02:00
ovl_entry.h ovl: implement volatile-specific fsync error behaviour 2021-01-28 10:22:48 +01:00
readdir.c ovl: skip stale entries in merge dir cache iteration 2021-08-10 10:21:30 +02:00
super.c ovl: add ovl_allow_offline_changes() helper 2021-08-17 11:47:44 +02:00
util.c ovl: consistent behavior for immutable/append-only inodes 2021-08-17 11:47:43 +02:00