+
+int Update_subarray(char *dev, char *subarray, char *update, struct mddev_ident *ident, int quiet)
+{
+ struct supertype supertype, *st = &supertype;
+ int fd, rv = 2;
+
+ memset(st, 0, sizeof(*st));
+
+ fd = open_subarray(dev, subarray, 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, subarray, 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;
+}
+
+/* Move spare from one array to another
+ * If adding to destination array fails
+ * add back to original array
+ * Returns 1 on success, 0 on failure */
+int move_spare(char *from_devname, char *to_devname, dev_t devid)
+{
+ struct mddev_dev devlist;
+ char devname[20];
+
+ /* try to remove and add */
+ int fd1 = open(to_devname, O_RDONLY);
+ int fd2 = open(from_devname, O_RDONLY);
+
+ if (fd1 < 0 || fd2 < 0) {
+ if (fd1>=0) close(fd1);
+ if (fd2>=0) close(fd2);
+ return 0;
+ }
+
+ devlist.next = NULL;
+ devlist.used = 0;
+ devlist.re_add = 0;
+ devlist.writemostly = 0;
+ devlist.devname = devname;
+ sprintf(devname, "%d:%d", major(devid), minor(devid));
+
+ devlist.disposition = 'r';
+ if (Manage_subdevs(from_devname, fd2, &devlist, -1, 0, NULL) == 0) {
+ devlist.disposition = 'a';
+ if (Manage_subdevs(to_devname, fd1, &devlist, -1, 0, NULL) == 0) {
+ /* make sure manager is aware of changes */
+ ping_manager(to_devname);
+ ping_manager(from_devname);
+ close(fd1);
+ close(fd2);
+ return 1;
+ }
+ else Manage_subdevs(from_devname, fd2, &devlist, -1, 0, NULL);
+ }
+ close(fd1);
+ close(fd2);
+ return 0;
+}