[SRU][J][PATCH 0/4] Fix regression in ext4 online resize

[Khalid Elmously]

BugLink: https://bugs.launchpad.net/bugs/2003816

A regression was introduced with de394a8665 "ext4: update s_overhead_clusters in the superblock during an on-line resize" in the 5.15 kernels. The issue was reported on AWS and on GCP but I believe all Jammy 5.15 kernels are affected.

3 ext4 fixes were applied at the same time upstream. The actual fix for the reported issue is "ext4: fix bad checksum after online resize" change. I have not reproduced/tested the bigalloc or group descriptors issues but they fix regressions introduced by the same commit and seemed simple enough so I grabbed them as well. The group descriptors fix required a complicated pre-requisite patch which would have brought in a lot of unnecessary code, so I applied a much smaller version of it as a SAUCE patch instead.


Confirmed that the reported issue is no longer reproducible with these changes.



Baokun Li (3):
  ext4: fix bad checksum after online resize
  ext4: fix corruption when online resizing a 1K bigalloc fs
  ext4: fix corrupt backup group descriptors after online resize

Khalid Elmously (1):
  UBUNTU: SAUCE: Export ext4_superblock_csum function

 fs/ext4/ext4.h   |  2 ++
 fs/ext4/resize.c | 27 ++++++++++++++++++++-------
 fs/ext4/super.c  |  2 +-
 3 files changed, 23 insertions(+), 8 deletions(-)

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2.34.1