[XFS] Add lockdep support for XFS

SGI-PV: 963965
SGI-Modid: xfs-linux-melb:xfs-kern:28485a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/xfs/linux-2.6/mrlock.h b/fs/xfs/linux-2.6/mrlock.h
index af168a1a98c1..c110bb002665 100644
--- a/fs/xfs/linux-2.6/mrlock.h
+++ b/fs/xfs/linux-2.6/mrlock.h
@@ -43,6 +43,18 @@ static inline void mrupdate(mrlock_t *mrp)
         mrp->mr_writer = 1;
 }
 
+static inline void mraccess_nested(mrlock_t *mrp, int subclass)
+{
+        down_read_nested(&mrp->mr_lock, subclass);
+}
+
+static inline void mrupdate_nested(mrlock_t *mrp, int subclass)
+{
+        down_write_nested(&mrp->mr_lock, subclass);
+        mrp->mr_writer = 1;
+}
+
+
 static inline int mrtryaccess(mrlock_t *mrp)
 {
         return down_read_trylock(&mrp->mr_lock);