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authorChristoph Hellwig <hch@infradead.org>2011-12-06 21:58:20 +0000
committerBen Myers <bpm@sgi.com>2011-12-15 10:04:31 -0600
commitab680bb739ca0e969148951c2e127f6683dcb933 (patch)
tree10422c5507bd48bf6029a03e6a89b94a356de735 /fs/xfs
parentbf72de3194e73fa210a904b0bd951135286bb385 (diff)
xfs: simplify xfs_qm_dqattach_grouphint
No need to play games with the qlock now that the freelist lock nests inside it. Also clean up various outdated comments. 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')
-rw-r--r--fs/xfs/xfs_qm.c64
1 files changed, 16 insertions, 48 deletions
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 22360bb26af..3c553454443 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -650,11 +650,7 @@ xfs_qm_dqattach_one(
/*
* Given a udquot and gdquot, attach a ptr to the group dquot in the
- * udquot as a hint for future lookups. The idea sounds simple, but the
- * execution isn't, because the udquot might have a group dquot attached
- * already and getting rid of that gets us into lock ordering constraints.
- * The process is complicated more by the fact that the dquots may or may not
- * be locked on entry.
+ * udquot as a hint for future lookups.
*/
STATIC void
xfs_qm_dqattach_grouphint(
@@ -665,45 +661,21 @@ xfs_qm_dqattach_grouphint(
xfs_dqlock(udq);
- if ((tmp = udq->q_gdquot)) {
- if (tmp == gdq) {
- xfs_dqunlock(udq);
- return;
- }
+ tmp = udq->q_gdquot;
+ if (tmp) {
+ if (tmp == gdq)
+ goto done;
udq->q_gdquot = NULL;
- /*
- * We can't keep any dqlocks when calling dqrele,
- * because the freelist lock comes before dqlocks.
- */
- xfs_dqunlock(udq);
- /*
- * we took a hard reference once upon a time in dqget,
- * so give it back when the udquot no longer points at it
- * dqput() does the unlocking of the dquot.
- */
xfs_qm_dqrele(tmp);
-
- xfs_dqlock(udq);
- xfs_dqlock(gdq);
-
- } else {
- ASSERT(XFS_DQ_IS_LOCKED(udq));
- xfs_dqlock(gdq);
- }
-
- ASSERT(XFS_DQ_IS_LOCKED(udq));
- ASSERT(XFS_DQ_IS_LOCKED(gdq));
- /*
- * Somebody could have attached a gdquot here,
- * when we dropped the uqlock. If so, just do nothing.
- */
- if (udq->q_gdquot == NULL) {
- XFS_DQHOLD(gdq);
- udq->q_gdquot = gdq;
}
+ xfs_dqlock(gdq);
+ XFS_DQHOLD(gdq);
xfs_dqunlock(gdq);
+
+ udq->q_gdquot = gdq;
+done:
xfs_dqunlock(udq);
}
@@ -770,17 +742,13 @@ xfs_qm_dqattach_locked(
ASSERT(ip->i_gdquot);
/*
- * We may or may not have the i_udquot locked at this point,
- * but this check is OK since we don't depend on the i_gdquot to
- * be accurate 100% all the time. It is just a hint, and this
- * will succeed in general.
- */
- if (ip->i_udquot->q_gdquot == ip->i_gdquot)
- goto done;
- /*
- * Attach i_gdquot to the gdquot hint inside the i_udquot.
+ * We do not have i_udquot locked at this point, but this check
+ * is OK since we don't depend on the i_gdquot to be accurate
+ * 100% all the time. It is just a hint, and this will
+ * succeed in general.
*/
- xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
+ if (ip->i_udquot->q_gdquot != ip->i_gdquot)
+ xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
}
done: