xfs: nest qm_dqfrlist_lock inside the dquot qlock

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Allow xfs_qm_dqput to work without trylock loops by nesting the freelist lock
inside the dquot qlock.  In turn that requires trylocks in the reclaim path
instead, but given it's a classic tradeoff between fast and slow path, and
we follow the model of the inode and dentry caches.

Document our new lock order now that it has settled.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

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Christoph Hellwig 2011-12-06 21:58:19 +00:00 • committed by Ben Myers

parent 92678554ab

commit bf72de3194

2 changed files with 41 additions and 60 deletions

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103

fs/xfs/xfs_dquot.c

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4

fs/xfs/xfs_qm.c

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