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xfs: drain deferred work items when scrubbing [v24.5]

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The design doc for XFS online fsck contains a long discussion of the
 eventual consistency models in use for XFS metadata.  In that chapter,
 we note that it is possible for scrub to collide with a chain of
 deferred space metadata updates, and proposes a lightweight solution:
 The use of a pending-intents counter so that scrub can wait for the
 system to drain all chains.
 
 This patchset implements that scrub drain.  The first patch implements
 the basic mechanism, and the subsequent patches reduce the runtime
 overhead by converting the implementation to use sloppy counters and
 introducing jump labels to avoid walking into scrub hooks when it isn't
 running.  This last paradigm repeats elsewhere in this megaseries.
 
 v23.1: make intent items take an active ref to the perag structure and
        document why we bump and drop the intent counts when we do
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'scrub-drain-intents-6.4_2023-04-11' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into guilt/xfs-for-next

xfs: drain deferred work items when scrubbing [v24.5]

The design doc for XFS online fsck contains a long discussion of the
eventual consistency models in use for XFS metadata.  In that chapter,
we note that it is possible for scrub to collide with a chain of
deferred space metadata updates, and proposes a lightweight solution:
The use of a pending-intents counter so that scrub can wait for the
system to drain all chains.

This patchset implements that scrub drain.  The first patch implements
the basic mechanism, and the subsequent patches reduce the runtime
overhead by converting the implementation to use sloppy counters and
introducing jump labels to avoid walking into scrub hooks when it isn't
running.  This last paradigm repeats elsewhere in this megaseries.

v23.1: make intent items take an active ref to the perag structure and
       document why we bump and drop the intent counts when we do

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2023-04-14 07:09:09 +10:00 • committed by Dave Chinner
commit b634abac59
31 changed files with 680 additions and 39 deletions
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