xfs: add the ability to join a held buffer to a defer_ops

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In certain cases, defer_ops callers will lock a buffer and want to hold
the lock across transaction rolls.  Similar to ijoined inodes, we want
to dirty & join the buffer with each transaction roll in defer_finish so
that afterwards the caller still owns the buffer lock and we haven't
inadvertently pinned the log.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

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Darrick J. Wong 2017-12-07 19:07:02 -08:00

parent b7e0b6ff54

commit b7b2846fe2

2 changed files with 40 additions and 4 deletions

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39

fs/xfs/libxfs/xfs_defer.c

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5

fs/xfs/libxfs/xfs_defer.h

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