Rearrange the code to avoid the conditional locking around the
flist_locked variable. This means we lose a (rather pointless)
assert, and hold the freelist lock a bit longer for one corner
case.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Index: xfs/fs/xfs/xfs_dquot.c
===================================================================
--- xfs.orig/fs/xfs/xfs_dquot.c 2011-08-29 18:16:23.349023464 +0200
+++ xfs/fs/xfs/xfs_dquot.c 2011-08-29 18:23:23.256748629 +0200
@@ -707,12 +707,9 @@ xfs_qm_dqlookup(
xfs_dquot_t **O_dqpp)
{
xfs_dquot_t *dqp;
- uint flist_locked;
ASSERT(mutex_is_locked(&qh->qh_lock));
- flist_locked = B_FALSE;
-
/*
* Traverse the hashchain looking for a match
*/
@@ -747,31 +744,19 @@ xfs_qm_dqlookup(
xfs_dqlock(dqp);
dqp->dq_flags &= ~(XFS_DQ_WANT);
}
- flist_locked = B_TRUE;
- }
-
- /*
- * id couldn't have changed; we had the hashlock all
- * along
- */
- ASSERT(be32_to_cpu(dqp->q_core.d_id) == id);
- if (flist_locked) {
- if (dqp->q_nrefs != 0) {
- mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
- flist_locked = B_FALSE;
- } else {
+ if (dqp->q_nrefs == 0) {
/* take it off the freelist */
trace_xfs_dqlookup_freelist(dqp);
list_del_init(&dqp->q_freelist);
xfs_Gqm->qm_dqfrlist_cnt--;
}
+ XFS_DQHOLD(dqp);
+ mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
+ } else {
+ XFS_DQHOLD(dqp);
}
- XFS_DQHOLD(dqp);
-
- if (flist_locked)
- mutex_unlock(&xfs_Gqm->qm_dqfrlist_lock);
/*
* move the dquot to the front of the hashchain
*/
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