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authorPeter Leckie <pleckie@sgi.com>2008-10-30 17:05:04 +1100
committerLachlan McIlroy <lachlan@sgi.com>2008-10-30 17:05:04 +1100
commitbc3048e3cd3806ccfd5b16b1a30e5d6013abbd3d (patch)
treec6e27010cb66cc52f41bc696def885cb672fb61f /fs/xfs/quota/xfs_dquot.c
parentd112f2984592acb774187b3adddc107fb0825500 (diff)
[XFS] Clean up dquot pincount code.
This is a code cleanup and optimization that removes a per mount point spinlock from the quota code and cleans up the code. The patch changes the pincount from being an int protected by a spinlock to an atomic_t allowing the pincount to be manipulated without holding the spinlock. This cleanup also protects against random wakup's of both the aild and xfssyncd by reevaluating the pincount after been woken. Two latter patches will address the Spurious wakeups. SGI-PV: 986789 SGI-Modid: xfs-linux-melb:xfs-kern:32215a Signed-off-by: Peter Leckie <pleckie@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: David Chinner <david@fromorbit.com> Signed-off-by: Donald Douwsma <donaldd@sgi.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs/quota/xfs_dquot.c')
-rw-r--r--fs/xfs/quota/xfs_dquot.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c
index f2705f2fd43..d3f4fbbe248 100644
--- a/fs/xfs/quota/xfs_dquot.c
+++ b/fs/xfs/quota/xfs_dquot.c
@@ -101,7 +101,7 @@ xfs_qm_dqinit(
if (brandnewdquot) {
dqp->dq_flnext = dqp->dq_flprev = dqp;
mutex_init(&dqp->q_qlock);
- sv_init(&dqp->q_pinwait, SV_DEFAULT, "pdq");
+ init_waitqueue_head(&dqp->q_pinwait);
/*
* Because we want to use a counting completion, complete
@@ -131,7 +131,7 @@ xfs_qm_dqinit(
dqp->q_res_bcount = 0;
dqp->q_res_icount = 0;
dqp->q_res_rtbcount = 0;
- dqp->q_pincount = 0;
+ atomic_set(&dqp->q_pincount, 0);
dqp->q_hash = NULL;
ASSERT(dqp->dq_flnext == dqp->dq_flprev);
@@ -1489,7 +1489,7 @@ xfs_qm_dqpurge(
"xfs_qm_dqpurge: dquot %p flush failed", dqp);
xfs_dqflock(dqp);
}
- ASSERT(dqp->q_pincount == 0);
+ ASSERT(atomic_read(&dqp->q_pincount) == 0);
ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
!(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));