Index: kernel/generic/include/mm/as.h
===================================================================
--- kernel/generic/include/mm/as.h	(revision 0b378820b4861f67ea1335ef6260a5c98a59c64c)
+++ kernel/generic/include/mm/as.h	(revision d06090069a203d5f9fd83e13255addd4175a807b)
@@ -238,7 +238,11 @@
 /** Address space area backend structure. */
 typedef struct mem_backend {
+	bool (* create)(as_area_t *);
+	bool (* resize)(as_area_t *, size_t);
+	void (* share)(as_area_t *);
+	void (* destroy)(as_area_t *);
+
 	int (* page_fault)(as_area_t *, uintptr_t, pf_access_t);
 	void (* frame_free)(as_area_t *, uintptr_t, uintptr_t);
-	void (* share)(as_area_t *);
 } mem_backend_t;