Btrfs: add dir inode index

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
new file mode 100644
index 0000000..ed8b7e2
--- /dev/null
+++ b/fs/btrfs/sysfs.c
@@ -0,0 +1,4 @@
+#include <linux/module.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "transaction.h"