+ return 0;
+}
+
+/**
+ * block_monitor - prevent mdmon spare assignment
+ * @container - container to block
+ * @freeze - flag to additionally freeze sync_action
+ *
+ * This is used by the reshape code to freeze the container, and the
+ * auto-rebuild implementation to atomically move spares.
+ * In both cases we need to stop mdmon from assigning spares to replace
+ * failed devices as we might have other plans for the spare.
+ * For the reshape case we also need to 'freeze' sync_action so that
+ * no recovery happens until we have fully prepared for the reshape.
+ *
+ * We tell mdmon that the array is frozen by marking the 'metadata' name
+ * with a leading '-'. The previously told mdmon "Don't make this array
+ * read/write, leave it readonly". Now it means a more general "Don't
+ * reconfigure this array at all".
+ * As older versions of mdmon (which might run from initrd) don't understand
+ * this, we first check that the running mdmon is new enough.
+ */
+int block_monitor(char *container, const int freeze)
+{
+ struct mdstat_ent *ent, *e, *e2;
+ struct mdinfo *sra = NULL;
+ char buf[64];
+ int rv = 0;
+
+ if (check_mdmon_version(container))
+ return -1;
+