diff options
| author | Christoph Hellwig <hch@infradead.org> | 2011-12-07 01:58:19 +0400 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2011-12-15 07:15:42 +0400 |
| commit | bf72de3194e73fa210a904b0bd951135286bb385 (patch) | |
| tree | 408ead179da91befd82e0cc23ed66830ead2fa59 /fs/xfs/xfs_qm.c | |
| parent | 92678554abfc2a2f2727ad168da87d8d434ac904 (diff) | |
| download | linux-bf72de3194e73fa210a904b0bd951135286bb385.tar.xz | |
xfs: nest qm_dqfrlist_lock inside the dquot qlock
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>
Diffstat (limited to 'fs/xfs/xfs_qm.c')
| -rw-r--r-- | fs/xfs/xfs_qm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index f418731e90f4..22360bb26af9 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -1668,7 +1668,9 @@ xfs_qm_dqreclaim_one(void) restart: list_for_each_entry(dqp, &xfs_Gqm->qm_dqfrlist, q_freelist) { struct xfs_mount *mp = dqp->q_mount; - xfs_dqlock(dqp); + + if (!xfs_dqlock_nowait(dqp)) + continue; /* * This dquot has already been grabbed by dqlookup. |