diff --git a/vfs/callback.h b/vfs/callback.h
new file mode 100644
index 000000000..8fa838ec8
--- /dev/null
+++ b/vfs/callback.h
@@ -0,0 +1,9 @@
+/*
+ * Warning: there's better version of this file somewhere else.
+ */
+
+#define CALL_INFO 0
+#define CALL_BOX 1
+#define CALL_PASSWD 2
+
+#define NUM_CALLBACKS 4