diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 2f89af2..d8d0906 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -2371,7 +2371,7 @@
 	 * Lock out other modifications to the RT bitmap inode.
 	 */
 	error = xfs_trans_iget(mp, ap->tp, mp->m_sb.sb_rbmino, 0,
-			       XFS_ILOCK_EXCL, &ip);
+			       XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP, &ip);
 	if (error)
 		return error;
 	ASSERT(ip == mp->m_rbmip);
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 5c95fa8..f753200 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -409,28 +409,35 @@
 /*
  * Flags for lockdep annotations.
  *
- * XFS_I[O]LOCK_PARENT - for operations that require locking two inodes
- * (ie directory operations that require locking a directory inode and
- * an entry inode).  The first inode gets locked with this flag so it
- * gets a lockdep subclass of 1 and the second lock will have a lockdep
- * subclass of 0.
+ * XFS_LOCK_PARENT - for directory operations that require locking a
+ * parent directory inode and a child entry inode.  The parent gets locked
+ * with this flag so it gets a lockdep subclass of 1 and the child entry
+ * lock will have a lockdep subclass of 0.
+ *
+ * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
+ * inodes do not participate in the normal lock order, and thus have their
+ * own subclasses.
  *
  * XFS_LOCK_INUMORDER - for locking several inodes at the some time
  * with xfs_lock_inodes().  This flag is used as the starting subclass
  * and each subsequent lock acquired will increment the subclass by one.
- * So the first lock acquired will have a lockdep subclass of 2, the
- * second lock will have a lockdep subclass of 3, and so on. It is
+ * So the first lock acquired will have a lockdep subclass of 4, the
+ * second lock will have a lockdep subclass of 5, and so on. It is
  * the responsibility of the class builder to shift this to the correct
  * portion of the lock_mode lockdep mask.
  */
 #define XFS_LOCK_PARENT		1
-#define XFS_LOCK_INUMORDER	2
+#define XFS_LOCK_RTBITMAP	2
+#define XFS_LOCK_RTSUM		3
+#define XFS_LOCK_INUMORDER	4
 
 #define XFS_IOLOCK_SHIFT	16
 #define	XFS_IOLOCK_PARENT	(XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)
 
 #define XFS_ILOCK_SHIFT		24
 #define	XFS_ILOCK_PARENT	(XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
+#define	XFS_ILOCK_RTBITMAP	(XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
+#define	XFS_ILOCK_RTSUM		(XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)
 
 #define XFS_IOLOCK_DEP_MASK	0x00ff0000
 #define XFS_ILOCK_DEP_MASK	0xff000000
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 037fab1..f592ac9 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1972,8 +1972,10 @@
 		/*
 		 * Lock out other callers by grabbing the bitmap inode lock.
 		 */
-		if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
-						XFS_ILOCK_EXCL, &ip)))
+		error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
+				       XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP,
+				       &ip);
+		if (error)
 			goto error_cancel;
 		ASSERT(ip == mp->m_rbmip);
 		/*
@@ -1986,8 +1988,9 @@
 		/*
 		 * Get the summary inode into the transaction.
 		 */
-		if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino, 0,
-						XFS_ILOCK_EXCL, &ip)))
+		error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino, 0,
+				       XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM, &ip);
+		if (error)
 			goto error_cancel;
 		ASSERT(ip == mp->m_rsumip);
 		/*
@@ -2160,8 +2163,9 @@
 	/*
 	 * Synchronize by locking the bitmap inode.
 	 */
-	if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
-					XFS_ILOCK_EXCL, &ip)))
+	error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
+			       XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP, &ip);
+	if (error)
 		return error;
 #if defined(__KERNEL__) && defined(DEBUG)
 	/*