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xfs: fix EFI recovery livelocks

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This series fixes a customer-reported transaction reservation bug
 introduced ten years ago that could result in livelocks during log
 recovery.  Log intent item recovery single-steps each step of a deferred
 op chain, which means that each step only needs to allocate one
 transaction's worth of space in the log, not an entire chain all at
 once.  This single-stepping is critical to unpinning the log tail since
 there's nobody else to do it for us.
 
 This has been lightly tested with fstests.  Enjoy!
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'fix-efi-recovery-6.6_2023-09-12' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.6-fixesA

xfs: fix EFI recovery livelocks

This series fixes a customer-reported transaction reservation bug
introduced ten years ago that could result in livelocks during log
recovery.  Log intent item recovery single-steps each step of a deferred
op chain, which means that each step only needs to allocate one
transaction's worth of space in the log, not an entire chain all at
once.  This single-stepping is critical to unpinning the log tail since
there's nobody else to do it for us.

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

* tag 'fix-efi-recovery-6.6_2023-09-12' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux:
  xfs: reserve less log space when recovering log intent items
This commit is contained in:
Chandan Babu R 2023-09-13 10:22:26 +05:30
commit b6c2b6378d
6 changed files with 40 additions and 9 deletions
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