WTF: [SRU][J/I][PATCH v2 0/1] re-apply missing overlayfs SAUCE patch

[Andrea Righi]

On Tue, Apr 19, 2022 at 09:22:27AM +0200, Stefan Bader wrote:
> On 14.04.22 17:57, Andrea Righi wrote:
> > BugLink: https://bugs.launchpad.net/bugs/1967924
> 
> The bug report is against linux-azure and without any series nomination. The
> submission against linux. What is that meant to be for?
> 
> -Stefan

Tracking bug fixed, that was obviously incorrect. Thanks for noticing
it, Stefan, the bug is against jammy/linux and impish/linux, in practice
this patch should be applied to all kernels >= 5.13.

-Andrea

> 
> > 
> > [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.
> > 
> > ChangeLog (v1 -> v2):
> >   - missing cover letter email
> > 
> > 
>