Merge branch 'fix/hda' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6

[linux-2.6-omap-h63xx.git] / fs / xfs / quota / xfs_dquot.c

diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c
index 591ca6602bfb6738e4677a43c094aa62d5238254..6543c0b297534a33f1af97d95cda43662a9d700b 100644 (file)
--- a/fs/xfs/quota/xfs_dquot.c
+++ b/fs/xfs/quota/xfs_dquot.c
@@ -73,6 +73,8 @@ int xfs_dqreq_num;
 int xfs_dqerror_mod = 33;
 #endif
 
+static struct lock_class_key xfs_dquot_other_class;
+
 /*
  * Allocate and initialize a dquot. We don't always allocate fresh memory;
  * we try to reclaim a free dquot if the number of incore dquots are above
@@ -139,7 +141,15 @@ xfs_qm_dqinit(
                 ASSERT(dqp->q_trace);
                 xfs_dqtrace_entry(dqp, "DQRECLAIMED_INIT");
 #endif
-        }
+       }
+
+       /*
+        * In either case we need to make sure group quotas have a different
+        * lock class than user quotas, to make sure lockdep knows we can
+        * locks of one of each at the same time.
+        */
+       if (!(type & XFS_DQ_USER))
+               lockdep_set_class(&dqp->q_qlock, &xfs_dquot_other_class);
 
        /*
         * log item gets initialized later
@@ -421,7 +431,7 @@ xfs_qm_dqalloc(
        /*
         * Initialize the bmap freelist prior to calling bmapi code.
         */
-       XFS_BMAP_INIT(&flist, &firstblock);
+       xfs_bmap_init(&flist, &firstblock);
        xfs_ilock(quotip, XFS_ILOCK_EXCL);
        /*
         * Return if this type of quotas is turned off while we didn't
@@ -1383,6 +1393,12 @@ xfs_dqunlock_nonotify(
        mutex_unlock(&(dqp->q_qlock));
 }
 
+/*
+ * Lock two xfs_dquot structures.
+ *
+ * To avoid deadlocks we always lock the quota structure with
+ * the lowerd id first.
+ */
 void
 xfs_dqlock2(
        xfs_dquot_t     *d1,
@@ -1392,18 +1408,16 @@ xfs_dqlock2(
                ASSERT(d1 != d2);
                if (be32_to_cpu(d1->q_core.d_id) >
                    be32_to_cpu(d2->q_core.d_id)) {
-                       xfs_dqlock(d2);
-                       xfs_dqlock(d1);
+                       mutex_lock(&d2->q_qlock);
+                       mutex_lock_nested(&d1->q_qlock, XFS_QLOCK_NESTED);
                } else {
-                       xfs_dqlock(d1);
-                       xfs_dqlock(d2);
-               }
-       } else {
-               if (d1) {
-                       xfs_dqlock(d1);
-               } else if (d2) {
-                       xfs_dqlock(d2);
+                       mutex_lock(&d1->q_qlock);
+                       mutex_lock_nested(&d2->q_qlock, XFS_QLOCK_NESTED);
                }
+       } else if (d1) {
+               mutex_lock(&d1->q_qlock);
+       } else if (d2) {
+               mutex_lock(&d2->q_qlock);
        }
 }