[PATCH 0/3] btrfs-progs: introduce a skeleton version of "btrfs rescue fix-data-csums"

[Qu Wenruo <wqu@suse.com>]

We have a long history of data csum mismatch, caused by direct IO and
buffered being modified during writeback.

Although the problem is worked around in v6.15 (and being backported),
for the affected fs there is no good way to fix them, other than complex
manually find out which files are affected and delete them.

This series introduce the initial implementation of "btrfs rescue
fix-data-csums", which is designed to fix such problem by either:

- Delete the affected files
- Update the csum items using the data from specified copy

But for the first step, just detect such csum mismatch (pretty much the
same as "btrfs check --check-data-csum"), and print out the affected
files.

No real repair is done yet, only dry run is supported (the default and
only mode yet).

Qu Wenruo (3):
  btrfs-progs: introduce "btrfs rescue fix-data-csums"
  btrfs-progs: fix a bug in btrfs_find_item()
  btrfs-progs: fix-data-csums: show affected files

 Documentation/btrfs-rescue.rst |  19 ++
 Makefile                       |   2 +-
 cmds/rescue-fix-data-csums.c   | 379 +++++++++++++++++++++++++++++++++
 cmds/rescue.c                  |  44 ++++
 cmds/rescue.h                  |   6 +
 kernel-shared/ctree.c          |  17 +-
 6 files changed, 463 insertions(+), 4 deletions(-)
 create mode 100644 cmds/rescue-fix-data-csums.c

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2.49.0