diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index e03c560..c2443a4 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -96,6 +96,13 @@
 	/* number of bytes that still need writing */
 	u64 bytes_left;
 
+	/*
+	 * the end of the ordered extent which is behind it but
+	 * didn't update disk_i_size. Please see the comment of
+	 * btrfs_ordered_update_i_size();
+	 */
+	u64 outstanding_isize;
+
 	/* flags (described above) */
 	unsigned long flags;