diff -r a28a5ccc894b -r d7b276de183b src/server/daemon/vfs.c
--- a/src/server/daemon/vfs.c	Sat Dec 03 18:00:35 2022 +0100
+++ b/src/server/daemon/vfs.c	Sun Dec 04 09:09:55 2022 +0100
@@ -780,6 +780,12 @@
     return 0;
 }
 
+NSAPI_PUBLIC int vfs_is_sys(VFS *vfs) {
+    if(!vfs) return 1;
+    if(vfs == &sys_vfs) return 1;
+    return 0;
+}
+
 // AIO API
 
 NSAPI_PUBLIC int system_aio_read(aiocb_s *aiocb) {