* fhandler.h (fhandler_base::utimes_fs): New method.

* fhandler.cc (fhandler_base::utimes): Call utimes_fs if on-disk special file.
* fhandler_disk_file.cc (fhandler_disk_file::utimes): Use utimes_fs.
(fhandler_base::utimes_fs): Handle on-disk device files.

winsup/cygwin/fhandler.cc

@@ -1635,6 +1635,9 @@ fhandler_base::link (const char *newpath)
 int
 fhandler_base::utimes (const struct timeval *tvp)
 {
+  if (is_fs_special ())
+    return utimes_fs (tvp);
+
   set_errno (EINVAL);
   return -1;
 }