[GIT PULL] xfs: bug fixes for 5.16-rc4

[Darrick J. Wong]

Hi Linus,

Please pull this branch for 5.16-rc4 that fixes a race between a
readonly remount process and other processes that hold a file IOLOCK on
files that previously experienced copy on write, that could result in
severe filesystem corruption if the filesystem is then remounted rw.  I
think this is fairly rare (since the only reliable reproducer I have
that fits the second criteria is the experimental xfs_scrub program),
but the race is clear, so we still need to fix this.

The branch merges cleanly against upstream as of a few minutes ago.
Please let me know if anything else strange happens during the merge
process.

--D

The following changes since commit e445976537ad139162980bee015b7364e5b64fff:

  xfs: remove incorrect ASSERT in xfs_rename (2021-12-01 17:27:48 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git tags/xfs-5.16-fixes-3

for you to fetch changes up to 089558bc7ba785c03815a49c89e28ad9b8de51f9:

  xfs: remove all COW fork extents when remounting readonly (2021-12-07 10:17:29 -0800)

----------------------------------------------------------------
Fixes for 5.16-rc4:
 - Fix a data corruption vector that can result from the ro remount
   process failing to clear all speculative preallocations from files
   and the rw remount process not noticing the incomplete cleanup.

----------------------------------------------------------------
Darrick J. Wong (1):
      xfs: remove all COW fork extents when remounting readonly

 fs/xfs/xfs_super.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)