Improve --re-add documentation

[thirdparty/mdadm.git] / Manage.c

diff --git a/Manage.c b/Manage.c
index c9a3705200467523a4a1f0bb12427f11e97bef72..3680d6841c53098121646ccd5fddb578c81e4473 100644 (file)
--- a/Manage.c
+++ b/Manage.c
@@ -1005,4 +1005,57 @@ int autodetect(void)
        }
        return rv;
 }
+
+int Update_subarray(char *dev, char *subarray, char *update, mddev_ident_t ident, int quiet)
+{
+       struct supertype supertype, *st = &supertype;
+       int fd, rv = 2;
+
+       memset(st, 0, sizeof(*st));
+       if (snprintf(st->subarray, sizeof(st->subarray), "%s", subarray) >=
+           sizeof(st->subarray)) {
+               if (!quiet)
+                       fprintf(stderr,
+                               Name ": Input overflow for subarray '%s' > %zu bytes\n",
+                               subarray, sizeof(st->subarray) - 1);
+               return 2;
+       }
+
+       fd = open_subarray(dev, st, quiet);
+       if (fd < 0)
+               return 2;
+
+       if (!st->ss->update_subarray) {
+               if (!quiet)
+                       fprintf(stderr,
+                               Name ": Operation not supported for %s metadata\n",
+                               st->ss->name);
+               goto free_super;
+       }
+
+       if (mdmon_running(st->devnum))
+               st->update_tail = &st->updates;
+
+       rv = st->ss->update_subarray(st, update, ident);
+
+       if (rv) {
+               if (!quiet)
+                       fprintf(stderr, Name ": Failed to update %s of subarray-%s in %s\n",
+                               update, subarray, dev);
+       } else if (st->update_tail)
+               flush_metadata_updates(st);
+       else
+               st->ss->sync_metadata(st);
+
+       if (rv == 0 && strcmp(update, "name") == 0 && !quiet)
+               fprintf(stderr,
+                       Name ": Updated subarray-%s name from %s, UUIDs may have changed\n",
+                       subarray, dev);
+
+ free_super:
+       st->ss->free_super(st);
+       close(fd);
+
+       return rv;
+}
 #endif