Index: contrib/arch/uspace/lib/libfs/fnc.libfs_lookup
===================================================================
--- contrib/arch/uspace/lib/libfs/fnc.libfs_lookup	(revision 704311becfa19a305a40a299ef9d6b02d6d6b2e6)
+++ contrib/arch/uspace/lib/libfs/fnc.libfs_lookup	(revision cf7b3e025e3db101a36b0419103a3b43b6675127)
@@ -1,1 +1,5 @@
-!fs.lookup*
+(
+	alternative fs tmpfs fat devfs {
+		!fs.lookup
+	}
+)*
Index: contrib/arch/uspace/lib/libfs/fnc.libfs_mount
===================================================================
--- contrib/arch/uspace/lib/libfs/fnc.libfs_mount	(revision 704311becfa19a305a40a299ef9d6b02d6d6b2e6)
+++ contrib/arch/uspace/lib/libfs/fnc.libfs_mount	(revision cf7b3e025e3db101a36b0419103a3b43b6675127)
@@ -1,6 +1,8 @@
-?fs.ipc_m_connection_clone ;
-?fs.ipc_m_data_write /* mount options */ {
-	!fs.ipc_m_connect_to_me ;
-	!fs.mounted ;
-	!fs.ipc_m_data_write /* forward */
+?ipc_m_connection_clone ;
+?ipc_m_data_write /* mount options */ {
+	alternative fs tmpfs fat devfs {
+		!fs.ipc_m_connect_to_me ;
+		!fs.mounted ;
+		!fs.ipc_m_data_write /* forward */
+	}
 }