diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index 237a35b..f721d47 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -88,6 +88,15 @@
 	uint			bt_hashmask;
 	uint			bt_hashshift;
 	xfs_bufhash_t		*bt_hash;
+
+	/* per device delwri queue */
+	struct task_struct	*bt_task;
+	struct list_head	bt_list;
+	struct list_head	bt_delwrite_queue;
+	spinlock_t		bt_delwrite_lock;
+	uint			bt_flags;
+#define BT_FORCE_SLEEP		1
+#define BT_FORCE_FLUSH		2
 } xfs_buftarg_t;
 
 /*