int lu_object_invariant(const struct lu_object *o);
/*
+ * Finalize and free devices in the device stack.
+ */
+void lu_stack_fini(const struct lu_env *env, struct lu_device *top);
+
+/*
* Returns 1 iff object @o exists on the stable storage,
* returns -1 iff object @o is on remote server.
*/