Btrfs: early fsync support

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 4f1496a..3cc2990 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -8,6 +8,7 @@
 	int use_count;
 	int commit_done;
 	int magic;
+	struct list_head list;
 	wait_queue_head_t writer_wait;
 	wait_queue_head_t commit_wait;
 };