** Tags added: patch
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https://bugs.launchpad.net/bugs/1967924
Title:
re-apply missing overlayfs SAUCE patch
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Impish:
Fix Released
Status in linux source package in Jammy:
Fix Released
Bug description:
[Impact]
Starting with 5.13 we've incorrectly dropped the following sauce
patch:
UBUNTU: SAUCE: overlayfs: fix incorrect mnt_id of files opened
from map_files
This patch seems to be required to use overlayfs on top of shiftfs and
without this patch we may break containers that rely on shiftfs (using
zfs/ceph as storage pool w/ shiftfs enabled).
[Test case]
No specific test case provided.
[Fix]
The original SAUCE patch relies on AUFS in order to use
vma->vm_prfile, but we're not providing AUFS anymore in jammy,.
The fix consists of re-apply this patch with a little refactoring to
be dependent on CONFIG_AUFS_FS.
[Regression potential]
This patch is touching overlayfs, so we may see potential regressions
in overlayfs.
[Original bug report]
The next patch has not been ported to the the 5.13 branch:
$ git show Ubuntu-azure-5.8-5.8.0-1033.35_20.04.1~656
commit 5f5716d1f7ece06c66d7d8145dd6b3a5886b3e56
Author: Alexander Mikhalitsyn <[email protected]>
Date: Mon Apr 26 10:11:00 2021 +0200
UBUNTU: SAUCE: overlayfs: fix incorrect mnt_id of files opened
from map_files
BugLink: https://bugs.launchpad.net/bugs/1857257
...
Fixes: d24b8a5 ("UBUNTU: SAUCE: overlayfs: allow with shiftfs as
underlay")
But it isn't in the 5.13 branch:
$ git log --pretty=oneline origin/azure-5.13-next fs/overlayfs/file.c
1e6145d8708c831d2aa5c26aa15eb98e1a1683b9 ovl: fix use after free in struct
ovl_aio_req
7b5bda27d1fc4d7bde20cf6ed203fe88c458169a ovl: fix IOCB_DIRECT if underlying
fs doesn't support direct IO
1626e7f7ab7eb74e142fec7fe6b7c9614972a56b ovl: fix deadlock in splice write
1443bc4a25ca84d60d39a8ae1dc6215abdd637a4 UBUNTU: SAUCE: overlayfs: allow with
shiftfs as underlay
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