+
+ if (array.not_persistent == 0) {
+
+ /* Make sure device is large enough */
+ if (st->ss->avail_size(st, ldsize/512) <
+ array.size) {
+ fprintf(stderr, Name ": %s not large enough to join array\n",
+ dv->devname);
+ return 1;
+ }
+
+ /* need to find a sample superblock to copy, and
+ * a spare slot to use
+ */
+ for (j=0; j<st->max_devs; j++) {
+ char *dev;
+ int dfd;
+ disc.number = j;
+ if (ioctl(fd, GET_DISK_INFO, &disc))
+ continue;
+ if (disc.major==0 && disc.minor==0)
+ continue;
+ if ((disc.state & 4)==0) continue; /* sync */
+ /* Looks like a good device to try */
+ dev = map_dev(disc.major, disc.minor, 1);
+ if (!dev) continue;
+ dfd = dev_open(dev, O_RDONLY);
+ if (dfd < 0) continue;
+ if (st->ss->load_super(st, dfd, &dsuper, NULL)) {
+ close(dfd);
+ continue;
+ }
+ close(dfd);
+ break;
+ }
+ if (!dsuper) {
+ fprintf(stderr, Name ": cannot find valid superblock in this array - HELP\n");
+ return 1;
+ }
+ /* Possibly this device was recently part of the array
+ * and was temporarily removed, and is now being re-added.
+ * If so, we can simply re-add it.
+ */
+ st->ss->uuid_from_super(st, duuid, dsuper);
+
+ /* re-add doesn't work for version-1 superblocks
+ * before 2.6.18 :-(
+ */
+ if (array.major_version == 1 &&
+ get_linux_version() <= 2006018)
+ ;
+ else if (osuper) {
+ st->ss->uuid_from_super(st, ouuid, osuper);
+ if (memcmp(duuid, ouuid, sizeof(ouuid))==0) {
+ /* looks close enough for now. Kernel
+ * will worry about whether a bitmap
+ * based reconstruction is possible.
+ */
+ struct mdinfo mdi;
+ st->ss->getinfo_super(st, &mdi, osuper);
+ disc.major = major(stb.st_rdev);
+ disc.minor = minor(stb.st_rdev);
+ disc.number = mdi.disk.number;
+ disc.raid_disk = mdi.disk.raid_disk;
+ disc.state = mdi.disk.state;
+ if (dv->writemostly)
+ disc.state |= 1 << MD_DISK_WRITEMOSTLY;
+ if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) {
+ if (verbose >= 0)
+ fprintf(stderr, Name ": re-added %s\n", dv->devname);
+ continue;
+ }
+ /* fall back on normal-add */
+ }
+ }
+ } else {
+ /* non-persistent. Must ensure that new drive
+ * is at least array.size big.
+ */
+ if (ldsize/512 < array.size) {
+ fprintf(stderr, Name ": %s not large enough to join array\n",
+ dv->devname);
+ return 1;
+ }
+ }
+ /* in 2.6.17 and earlier, version-1 superblocks won't
+ * use the number we write, but will choose a free number.
+ * we must choose the same free number, which requires
+ * starting at 'raid_disks' and counting up