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xfs: online repair of realtime summaries [v30.3 05/16]

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We now have all the infrastructure we need to repair file metadata.
 We'll begin with the realtime summary file, because it is the least
 complex data structure.  To support this we need to add three more
 pieces to the temporary file code from the previous patchset --
 preallocating space in the temp file, formatting metadata into that
 space and writing the blocks to disk, and swapping the fork mappings
 atomically.
 
 After that, the actual reconstruction of the realtime summary
 information is pretty simple, since we can simply write the incore
 copy computed by the rtsummary scrubber to the temporary file, swap the
 contents, and reap the old blocks.
 
 This has been running on the djcloud for months with no problems.  Enjoy!
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'repair-rtsummary-6.10_2024-04-15' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.10-mergeA

xfs: online repair of realtime summaries

We now have all the infrastructure we need to repair file metadata.
We'll begin with the realtime summary file, because it is the least
complex data structure.  To support this we need to add three more
pieces to the temporary file code from the previous patchset --
preallocating space in the temp file, formatting metadata into that
space and writing the blocks to disk, and swapping the fork mappings
atomically.

After that, the actual reconstruction of the realtime summary
information is pretty simple, since we can simply write the incore
copy computed by the rtsummary scrubber to the temporary file, swap the
contents, and reap the old blocks.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

* tag 'repair-rtsummary-6.10_2024-04-15' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux:
  xfs: online repair of realtime summaries
  xfs: teach the tempfile to set up atomic file content exchanges
  xfs: support preallocating and copying content into temporary files
This commit is contained in:
Chandan Babu R 2024-04-16 11:45:33 +05:30
commit 8b309acd10
12 changed files with 715 additions and 19 deletions
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