Index: uspace/srv/fs/fat/fat.c
===================================================================
--- uspace/srv/fs/fat/fat.c	(revision dc9162b9185e5bbf68a810f11aed714183f91ffd)
+++ uspace/srv/fs/fat/fat.c	(revision ce8c8488338a4fa1477e364ebbfa582bc5919554)
@@ -100,4 +100,10 @@
 			fat_mount(callid, &call);
 			break;
+		case VFS_OUT_UNMOUNTED:
+			fat_unmounted(callid, &call);
+			break;
+		case VFS_OUT_UNMOUNT:
+			fat_unmount(callid, &call);
+			break;
 		case VFS_OUT_LOOKUP:
 			fat_lookup(callid, &call);
Index: uspace/srv/fs/fat/fat.h
===================================================================
--- uspace/srv/fs/fat/fat.h	(revision dc9162b9185e5bbf68a810f11aed714183f91ffd)
+++ uspace/srv/fs/fat/fat.h	(revision ce8c8488338a4fa1477e364ebbfa582bc5919554)
@@ -204,4 +204,6 @@
 extern void fat_mounted(ipc_callid_t, ipc_call_t *);
 extern void fat_mount(ipc_callid_t, ipc_call_t *);
+extern void fat_unmounted(ipc_callid_t, ipc_call_t *);
+extern void fat_unmount(ipc_callid_t, ipc_call_t *);
 extern void fat_lookup(ipc_callid_t, ipc_call_t *);
 extern void fat_read(ipc_callid_t, ipc_call_t *);
Index: uspace/srv/fs/fat/fat_ops.c
===================================================================
--- uspace/srv/fs/fat/fat_ops.c	(revision dc9162b9185e5bbf68a810f11aed714183f91ffd)
+++ uspace/srv/fs/fat/fat_ops.c	(revision ce8c8488338a4fa1477e364ebbfa582bc5919554)
@@ -1117,4 +1117,14 @@
 }
 
+void fat_unmounted(ipc_callid_t rid, ipc_call_t *request)
+{
+	ipc_answer_0(rid, ENOTSUP);
+}
+
+void fat_unmount(ipc_callid_t rid, ipc_call_t *request)
+{
+	libfs_unmount(&fat_libfs_ops, rid, request);
+}
+
 void fat_lookup(ipc_callid_t rid, ipc_call_t *request)
 {