server: Add get_sd and set_sd object operations to allow the security descriptor to be stored somewhere other than server memory, such as on disk.
diff --git a/server/mapping.c b/server/mapping.c
index 7b99134..8c1e6b0 100644
--- a/server/mapping.c
+++ b/server/mapping.c
@@ -67,6 +67,8 @@
     no_signal,                   /* signal */
     mapping_get_fd,              /* get_fd */
     mapping_map_access,          /* map_access */
+    default_get_sd,              /* get_sd */
+    default_set_sd,              /* set_sd */
     no_lookup_name,              /* lookup_name */
     no_open_file,                /* open_file */
     fd_close_handle,             /* close_handle */