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xfs: add helpers to deal with transaction allocation and rolling

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For repairs, we need to reserve at least as many blocks as we think
we're going to need to rebuild the data structure, and we're going to
need some helpers to roll transactions while maintaining locks on the AG
headers so that other threads cannot wander into the middle of a repair.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
This commit is contained in:
Darrick J. Wong 2018-05-29 22:18:08 -07:00
commit 0a9633fa2f
6 changed files with 194 additions and 7 deletions
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