Index: uspace/lib/fs/libfs.h
===================================================================
--- uspace/lib/fs/libfs.h	(revision e8f0158bbed77874dc1a995889e6836262320db3)
+++ uspace/lib/fs/libfs.h	(revision d0a1e9b64b5ef6dfd3ac6d90e0c04dbd1b0ee23e)
@@ -93,7 +93,7 @@
 	bool (* is_file)(fs_node_t *);
 	service_id_t (* service_get)(fs_node_t *);
-	long (* size_block)(service_id_t);
-	long (* total_block)(service_id_t);
-	long (* free_block)(service_id_t);
+	uint32_t (* size_block)(service_id_t);
+	uint64_t (* total_block)(service_id_t);
+	uint64_t (* free_block)(service_id_t);
 } libfs_ops_t;