[PATCH 0/2] xfs: more shutdown/recovery fixes

[Dave Chinner <david@fromorbit.com>]

Hi folks,

These two patches are followups to my recent series of
shutdown/recovery fixes. The cluster buffer lock patch addresses a
race condition that started to show up regularly once the fixes in
the previous series were done - it is a regression from the async
inode reclaim work that was done almost 2 years ago now.

The second patch is something I'm really surprised has taken this
long to uncover. There is a check in intent recovery/cancellation
that checks that there are no intent items in the AIL after the
first non-intent item is found. This behaviour was correct back when
we only had standalone intent items (i.e. EFI/EFD), but when we
started to chain complex operations by intents, the recovery of an
incomplete intent can log and commit new intents and they can end up
in the AIL before log recovery is complete and finished processing
the deferred items. Hence the ASSERT() check that no intents
exist in the AIL after the first non-intent item is simply invalid.

With these two patches, I'm back to being able to run hundreds of
cycles of g/388 or -g recoveryloop without seeing any failures.

-Dave.