Index: uspace/lib/fs/libfs.c
===================================================================
--- uspace/lib/fs/libfs.c	(revision efcebe1bce63b6779458eadc2fd6f252ab7cd703)
+++ uspace/lib/fs/libfs.c	(revision 7eb0fed89435279831404b521cf4bb3b30d02cd6)
@@ -93,6 +93,7 @@
 	rc = vfs_out_ops->mounted(devmap_handle, opts, &index, &size, &lnkcnt);
 
-	if (rc == EOK)	// FIXME: size is 64-bit
-		async_answer_3(rid, EOK, index, size, lnkcnt);
+	if (rc == EOK)
+		async_answer_4(rid, EOK, index, LOWER32(size), UPPER32(size),
+		    lnkcnt);
 	else
 		async_answer_0(rid, rc);
@@ -434,6 +435,6 @@
 	 * Do not release the FS node so that it stays in memory.
 	 */
-	async_answer_3(rid, rc, IPC_GET_ARG1(answer), IPC_GET_ARG2(answer),
-	    IPC_GET_ARG3(answer));
+	async_answer_4(rid, rc, IPC_GET_ARG1(answer), IPC_GET_ARG2(answer),
+	    IPC_GET_ARG3(answer), IPC_GET_ARG4(answer));
 }