diff --git a/[refs] b/[refs]
index 89f7fd7c88e2..fe01ad7ed52e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 688f869ce3bdc892daa993534dc6df18c95df931
+refs/heads/master: c2cc7028e41c76e44b6e247c4b495c7523b23c87
diff --git a/trunk/include/linux/journal-head.h b/trunk/include/linux/journal-head.h
index 525aac3c97df..44e95d0a721f 100644
--- a/trunk/include/linux/journal-head.h
+++ b/trunk/include/linux/journal-head.h
@@ -40,6 +40,13 @@ struct journal_head {
 	 */
 	unsigned b_modified;
 
+	/*
+	 * This feild tracks the last transaction id in which this buffer
+	 * has been cowed
+	 * [jbd_lock_bh_state()]
+	 */
+	unsigned b_cow_tid;
+
 	/*
 	 * Copy of the buffer data frozen for writing to the log.
 	 * [jbd_lock_bh_state()]