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authorChristoph Hellwig <hch@lst.de>2009-01-19 02:03:11 +0100
committerLachlan McIlroy <lachlan@sgi.com>2009-01-19 14:44:44 +1100
commit080dda7f5e8e8df95bcd17a5345c276e365a2054 (patch)
tree19937537e0c3d623255ccf1e76af36eceb2fb584
parent62e194ecdaf8a1935991c1f8704886328d96a391 (diff)
xfs: add a separate lock class for the per-mount list of dquots
We can have both a a quota hash chain and the per-mount list locked at the same time. But given that both use the same struct dqhash as list head we have to tell lockdep that they are different lock classes. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com>
-rw-r--r--fs/xfs/quota/xfs_qm.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/xfs/quota/xfs_qm.c b/fs/xfs/quota/xfs_qm.c
index 6b13960cf31..7a2beb64314 100644
--- a/fs/xfs/quota/xfs_qm.c
+++ b/fs/xfs/quota/xfs_qm.c
@@ -1070,6 +1070,13 @@ xfs_qm_sync(
return 0;
}
+/*
+ * The hash chains and the mplist use the same xfs_dqhash structure as
+ * their list head, but we can take the mplist qh_lock and one of the
+ * hash qh_locks at the same time without any problem as they aren't
+ * related.
+ */
+static struct lock_class_key xfs_quota_mplist_class;
/*
* This initializes all the quota information that's kept in the
@@ -1105,6 +1112,8 @@ xfs_qm_init_quotainfo(
}
xfs_qm_list_init(&qinf->qi_dqlist, "mpdqlist", 0);
+ lockdep_set_class(&qinf->qi_dqlist.qh_lock, &xfs_quota_mplist_class);
+
qinf->qi_dqreclaims = 0;
/* mutex used to serialize quotaoffs */