server: Add an open_file() function to the object operations.
diff --git a/server/change.c b/server/change.c
index 4ecbc46..db50342 100644
--- a/server/change.c
+++ b/server/change.c
@@ -177,6 +177,7 @@
     dir_get_fd,               /* get_fd */
     dir_map_access,           /* map_access */
     no_lookup_name,           /* lookup_name */
+    no_open_file,             /* open_file */
     fd_close_handle,          /* close_handle */
     dir_destroy               /* destroy */
 };