Create.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@suse.de>
  23  */
  24
  25 #include        "mdadm.h"
  26 #include        "md_u.h"
  27 #include        "md_p.h"
  28 #include        <ctype.h>
  29 #include        <fcntl.h>
  30 #include        <signal.h>
  31 #include        <sys/signalfd.h>
  32 #include        <sys/wait.h>
  33
  34 static int round_size_and_verify(unsigned long long *size, int chunk)
  35 {
  36         if (*size == 0)
  37                 return 0;
  38         *size &= ~(unsigned long long)(chunk - 1);
  39         if (*size == 0) {
  40                 pr_err("Size cannot be smaller than chunk.\n");
  41                 return 1;
  42         }
  43         return 0;
  44 }
  45
  46 /**
  47  * default_layout() - Get default layout for level.
  48  * @st: metadata requested, could be NULL.
  49  * @level: raid level requested.
  50  * @verbose: verbose level.
  51  *
  52  * Try to ask metadata handler first, otherwise use global defaults.
  53  *
  54  * Return: Layout or &UnSet, return value meaning depends of level used.
  55  */
  56 int default_layout(struct supertype *st, int level, int verbose)
  57 {
  58         int layout = UnSet;
  59         mapping_t *layout_map = NULL;
  60         char *layout_name = NULL;
  61
  62         if (st && st->ss->default_geometry)
  63                 st->ss->default_geometry(st, &level, &layout, NULL);
  64
  65         if (layout != UnSet)
  66                 return layout;
  67
  68         switch (level) {
  69         default: /* no layout */
  70                 layout = 0;
  71                 break;
  72         case 0:
  73                 layout = RAID0_ORIG_LAYOUT;
  74                 break;
  75         case 10:
  76                 layout = 0x102; /* near=2, far=1 */
  77                 layout_name = "n2";
  78                 break;
  79         case 5:
  80         case 6:
  81                 layout_map = r5layout;
  82                 break;
  83         case LEVEL_FAULTY:
  84                 layout_map = faultylayout;
  85                 break;
  86         }
  87
  88         if (layout_map) {
  89                 layout = map_name(layout_map, "default");
  90                 layout_name = map_num_s(layout_map, layout);
  91         }
  92         if (layout_name && verbose > 0)
  93                 pr_err("layout defaults to %s\n", layout_name);
  94
  95         return layout;
  96 }
  97
  98 static pid_t write_zeroes_fork(int fd, struct shape *s, struct supertype *st,
  99                                struct mddev_dev *dv)
 100
 101 {
 102         const unsigned long long req_size = 1 << 30;
 103         unsigned long long offset_bytes, size_bytes, sz;
 104         sigset_t sigset;
 105         int ret = 0;
 106         pid_t pid;
 107
 108         size_bytes = KIB_TO_BYTES(s->size);
 109
 110         /*
 111          * If size_bytes is zero, this is a zoned raid array where
 112          * each disk is of a different size and uses its full
 113          * disk. Thus zero the entire disk.
 114          */
 115         if (!size_bytes && !get_dev_size(fd, dv->devname, &size_bytes))
 116                 return -1;
 117
 118         if (dv->data_offset != INVALID_SECTORS)
 119                 offset_bytes = SEC_TO_BYTES(dv->data_offset);
 120         else
 121                 offset_bytes = SEC_TO_BYTES(st->data_offset);
 122
 123         pr_info("zeroing data from %lld to %lld on: %s\n",
 124                 offset_bytes, size_bytes, dv->devname);
 125
 126         pid = fork();
 127         if (pid < 0) {
 128                 pr_err("Could not fork to zero disks: %s\n", strerror(errno));
 129                 return pid;
 130         } else if (pid != 0) {
 131                 return pid;
 132         }
 133
 134         sigemptyset(&sigset);
 135         sigaddset(&sigset, SIGINT);
 136         sigprocmask(SIG_UNBLOCK, &sigset, NULL);
 137
 138         while (size_bytes) {
 139                 /*
 140                  * Split requests to the kernel into 1GB chunks seeing the
 141                  * fallocate() call is not interruptible and blocking a
 142                  * ctrl-c for several minutes is not desirable.
 143                  *
 144                  * 1GB is chosen as a compromise: the user may still have
 145                  * to wait several seconds if they ctrl-c on devices that
 146                  * zero slowly, but will reduce the number of requests
 147                  * required and thus the overhead on devices that perform
 148                  * better.
 149                  */
 150                 sz = size_bytes;
 151                 if (sz >= req_size)
 152                         sz = req_size;
 153
 154                 if (fallocate(fd, FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
 155                               offset_bytes, sz)) {
 156                         pr_err("zeroing %s failed: %s\n", dv->devname,
 157                                strerror(errno));
 158                         ret = 1;
 159                         break;
 160                 }
 161
 162                 offset_bytes += sz;
 163                 size_bytes -= sz;
 164         }
 165
 166         exit(ret);
 167 }
 168
 169 static int wait_for_zero_forks(int *zero_pids, int count)
 170 {
 171         int wstatus, ret = 0, i, sfd, wait_count = 0;
 172         struct signalfd_siginfo fdsi;
 173         bool interrupted = false;
 174         sigset_t sigset;
 175         ssize_t s;
 176
 177         for (i = 0; i < count; i++)
 178                 if (zero_pids[i])
 179                         wait_count++;
 180         if (!wait_count)
 181                 return 0;
 182
 183         sigemptyset(&sigset);
 184         sigaddset(&sigset, SIGINT);
 185         sigaddset(&sigset, SIGCHLD);
 186         sigprocmask(SIG_BLOCK, &sigset, NULL);
 187
 188         sfd = signalfd(-1, &sigset, 0);
 189         if (sfd < 0) {
 190                 pr_err("Unable to create signalfd: %s\n", strerror(errno));
 191                 return 1;
 192         }
 193
 194         while (1) {
 195                 s = read(sfd, &fdsi, sizeof(fdsi));
 196                 if (s != sizeof(fdsi)) {
 197                         pr_err("Invalid signalfd read: %s\n", strerror(errno));
 198                         close(sfd);
 199                         return 1;
 200                 }
 201
 202                 if (fdsi.ssi_signo == SIGINT) {
 203                         printf("\n");
 204                         pr_info("Interrupting zeroing processes, please wait...\n");
 205                         interrupted = true;
 206                 } else if (fdsi.ssi_signo == SIGCHLD) {
 207                         if (!--wait_count)
 208                                 break;
 209                 }
 210         }
 211
 212         close(sfd);
 213
 214         for (i = 0; i < count; i++) {
 215                 if (!zero_pids[i])
 216                         continue;
 217
 218                 waitpid(zero_pids[i], &wstatus, 0);
 219                 zero_pids[i] = 0;
 220                 if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus))
 221                         ret = 1;
 222         }
 223
 224         if (interrupted) {
 225                 pr_err("zeroing interrupted!\n");
 226                 return 1;
 227         }
 228
 229         if (ret)
 230                 pr_err("zeroing failed!\n");
 231         else
 232                 pr_info("zeroing finished\n");
 233
 234         return ret;
 235 }
 236
 237 static int add_disk_to_super(int mdfd, struct shape *s, struct context *c,
 238                 struct supertype *st, struct mddev_dev *dv,
 239                 struct mdinfo *info, int have_container, int major_num,
 240                 int *zero_pid)
 241 {
 242         dev_t rdev;
 243         int fd;
 244
 245         if (dv->disposition == 'j') {
 246                 info->disk.raid_disk = MD_DISK_ROLE_JOURNAL;
 247                 info->disk.state = (1<<MD_DISK_JOURNAL);
 248         } else if (info->disk.raid_disk < s->raiddisks) {
 249                 info->disk.state = (1<<MD_DISK_ACTIVE) |
 250                         (1<<MD_DISK_SYNC);
 251         } else {
 252                 info->disk.state = 0;
 253         }
 254
 255         if (dv->writemostly == FlagSet) {
 256                 if (major_num == BITMAP_MAJOR_CLUSTERED) {
 257                         pr_err("Can not set %s --write-mostly with a clustered bitmap\n",dv->devname);
 258                         return 1;
 259                 } else {
 260                         info->disk.state |= (1<<MD_DISK_WRITEMOSTLY);
 261                 }
 262
 263         }
 264
 265         if (dv->failfast == FlagSet)
 266                 info->disk.state |= (1<<MD_DISK_FAILFAST);
 267
 268         if (have_container) {
 269                 fd = -1;
 270         } else {
 271                 if (st->ss->external && st->container_devnm[0])
 272                         fd = open(dv->devname, O_RDWR);
 273                 else
 274                         fd = open(dv->devname, O_RDWR|O_EXCL);
 275
 276                 if (fd < 0) {
 277                         pr_err("failed to open %s after earlier success - aborting\n",
 278                                dv->devname);
 279                         return 1;
 280                 }
 281                 if (!fstat_is_blkdev(fd, dv->devname, &rdev))
 282                         return 1;
 283                 info->disk.major = major(rdev);
 284                 info->disk.minor = minor(rdev);
 285         }
 286         if (fd >= 0)
 287                 remove_partitions(fd);
 288         if (st->ss->add_to_super(st, &info->disk, fd, dv->devname,
 289                                  dv->data_offset)) {
 290                 ioctl(mdfd, STOP_ARRAY, NULL);
 291                 return 1;
 292         }
 293         st->ss->getinfo_super(st, info, NULL);
 294
 295         if (fd >= 0 && s->write_zeroes) {
 296                 *zero_pid = write_zeroes_fork(fd, s, st, dv);
 297                 if (*zero_pid <= 0) {
 298                         ioctl(mdfd, STOP_ARRAY, NULL);
 299                         return 1;
 300                 }
 301         }
 302
 303         if (have_container && c->verbose > 0)
 304                 pr_err("Using %s for device %d\n",
 305                        map_dev(info->disk.major, info->disk.minor, 0),
 306                        info->disk.number);
 307
 308         if (!have_container) {
 309                 /* getinfo_super might have lost these ... */
 310                 info->disk.major = major(rdev);
 311                 info->disk.minor = minor(rdev);
 312         }
 313
 314         return 0;
 315 }
 316
 317 static int update_metadata(int mdfd, struct shape *s, struct supertype *st,
 318                            struct map_ent **map, struct mdinfo *info,
 319                            char *chosen_name)
 320 {
 321         struct mdinfo info_new;
 322         struct map_ent *me = NULL;
 323
 324         /* check to see if the uuid has changed due to these
 325          * metadata changes, and if so update the member array
 326          * and container uuid.  Note ->write_init_super clears
 327          * the subarray cursor such that ->getinfo_super once
 328          * again returns container info.
 329          */
 330         st->ss->getinfo_super(st, &info_new, NULL);
 331         if (st->ss->external && !is_container(s->level) &&
 332             !same_uuid(info_new.uuid, info->uuid, 0)) {
 333                 map_update(map, fd2devnm(mdfd),
 334                            info_new.text_version,
 335                            info_new.uuid, chosen_name);
 336                 me = map_by_devnm(map, st->container_devnm);
 337         }
 338
 339         if (st->ss->write_init_super(st)) {
 340                 st->ss->free_super(st);
 341                 return 1;
 342         }
 343
 344         /*
 345          * Before activating the array, perform extra steps
 346          * required to configure the internal write-intent
 347          * bitmap.
 348          */
 349         if (info_new.consistency_policy == CONSISTENCY_POLICY_BITMAP &&
 350             st->ss->set_bitmap && st->ss->set_bitmap(st, info)) {
 351                 st->ss->free_super(st);
 352                 return 1;
 353         }
 354
 355         /* update parent container uuid */
 356         if (me) {
 357                 char *path = xstrdup(me->path);
 358
 359                 st->ss->getinfo_super(st, &info_new, NULL);
 360                 map_update(map, st->container_devnm, info_new.text_version,
 361                            info_new.uuid, path);
 362                 free(path);
 363         }
 364
 365         flush_metadata_updates(st);
 366         st->ss->free_super(st);
 367
 368         return 0;
 369 }
 370
 371 static int add_disks(int mdfd, struct mdinfo *info, struct shape *s,
 372                      struct context *c, struct supertype *st,
 373                      struct map_ent **map, struct mddev_dev *devlist,
 374                      int total_slots, int have_container, int insert_point,
 375                      int major_num, char *chosen_name)
 376 {
 377         struct mddev_dev *moved_disk = NULL;
 378         int pass, raid_disk_num, dnum;
 379         int zero_pids[total_slots];
 380         struct mddev_dev *dv;
 381         struct mdinfo *infos;
 382         sigset_t sigset, orig_sigset;
 383         int ret = 0;
 384
 385         /*
 386          * Block SIGINT so the main thread will always wait for the
 387          * zeroing processes when being interrupted. Otherwise the
 388          * zeroing processes will finish their work in the background
 389          * keeping the disk busy.
 390          */
 391         sigemptyset(&sigset);
 392         sigaddset(&sigset, SIGINT);
 393         sigprocmask(SIG_BLOCK, &sigset, &orig_sigset);
 394         memset(zero_pids, 0, sizeof(zero_pids));
 395
 396         infos = xmalloc(sizeof(*infos) * total_slots);
 397         enable_fds(total_slots);
 398         for (pass = 1; pass <= 2; pass++) {
 399                 for (dnum = 0, raid_disk_num = 0, dv = devlist; dv;
 400                      dv = (dv->next) ? (dv->next) : moved_disk, dnum++) {
 401                         if (dnum >= total_slots)
 402                                 abort();
 403                         if (dnum == insert_point) {
 404                                 raid_disk_num += 1;
 405                                 moved_disk = dv;
 406                                 continue;
 407                         }
 408                         if (strcasecmp(dv->devname, "missing") == 0) {
 409                                 raid_disk_num += 1;
 410                                 continue;
 411                         }
 412                         if (have_container)
 413                                 moved_disk = NULL;
 414                         if (have_container && dnum < total_slots - 1)
 415                                 /* repeatedly use the container */
 416                                 moved_disk = dv;
 417
 418                         switch(pass) {
 419                         case 1:
 420                                 infos[dnum] = *info;
 421                                 infos[dnum].disk.number = dnum;
 422                                 infos[dnum].disk.raid_disk = raid_disk_num++;
 423
 424                                 if (dv->disposition == 'j')
 425                                         raid_disk_num--;
 426
 427                                 ret = add_disk_to_super(mdfd, s, c, st, dv,
 428                                                 &infos[dnum], have_container,
 429                                                 major_num, &zero_pids[dnum]);
 430                                 if (ret)
 431                                         goto out;
 432
 433                                 break;
 434                         case 2:
 435                                 infos[dnum].errors = 0;
 436
 437                                 ret = add_disk(mdfd, st, info, &infos[dnum]);
 438                                 if (ret) {
 439                                         pr_err("ADD_NEW_DISK for %s failed: %s\n",
 440                                                dv->devname, strerror(errno));
 441                                         if (errno == EINVAL &&
 442                                             info->array.level == 0) {
 443                                                 pr_err("Possibly your kernel doesn't support RAID0 layouts.\n");
 444                                                 pr_err("Either upgrade, or use --layout=dangerous\n");
 445                                         }
 446                                         goto out;
 447                                 }
 448                                 break;
 449                         }
 450                         if (!have_container &&
 451                             dv == moved_disk && dnum != insert_point) break;
 452                 }
 453
 454                 if (pass == 1) {
 455                         ret = wait_for_zero_forks(zero_pids, total_slots);
 456                         if (ret)
 457                                 goto out;
 458
 459                         ret = update_metadata(mdfd, s, st, map, info,
 460                                               chosen_name);
 461                         if (ret)
 462                                 goto out;
 463                 }
 464         }
 465
 466 out:
 467         if (ret)
 468                 wait_for_zero_forks(zero_pids, total_slots);
 469         free(infos);
 470         sigprocmask(SIG_SETMASK, &orig_sigset, NULL);
 471         return ret;
 472 }
 473
 474 int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 475            struct mddev_dev *devlist, struct shape *s, struct context *c)
 476 {
 477         /*
 478          * Create a new raid array.
 479          *
 480          * First check that necessary details are available
 481          * (i.e. level, raid-disks)
 482          *
 483          * Then check each disk to see what might be on it
 484          * and report anything interesting.
 485          *
 486          * If anything looks odd, and runstop not set,
 487          * abort.
 488          *
 489          * SET_ARRAY_INFO and ADD_NEW_DISK, and
 490          * if runstop==run, or raiddisks disks were used,
 491          * RUN_ARRAY
 492          */
 493         int mdfd;
 494         unsigned long long minsize = 0, maxsize = 0;
 495         char *mindisc = NULL;
 496         char *maxdisc = NULL;
 497         char *name = ident->name;
 498         int *uuid = ident->uuid_set == 1 ? ident->uuid : NULL;
 499         int dnum;
 500         struct mddev_dev *dv;
 501         dev_t rdev;
 502         int fail = 0, warn = 0;
 503         int first_missing = subdevs * 2;
 504         int second_missing = subdevs * 2;
 505         int missing_disks = 0;
 506         int insert_point = subdevs * 2; /* where to insert a missing drive */
 507         int total_slots;
 508         int rv;
 509         int bitmap_fd;
 510         int have_container = 0;
 511         int container_fd = -1;
 512         int need_mdmon = 0;
 513         unsigned long long bitmapsize;
 514         struct mdinfo info;
 515         int did_default = 0;
 516         int do_default_layout = 0;
 517         int do_default_chunk = 0;
 518         char chosen_name[1024];
 519         struct map_ent *map = NULL;
 520         unsigned long long newsize;
 521         mdu_array_info_t inf;
 522
 523         int major_num = BITMAP_MAJOR_HI;
 524         if (s->bitmap_file && strcmp(s->bitmap_file, "clustered") == 0) {
 525                 major_num = BITMAP_MAJOR_CLUSTERED;
 526                 if (c->nodes <= 1) {
 527                         pr_err("At least 2 nodes are needed for cluster-md\n");
 528                         return 1;
 529                 }
 530         }
 531
 532         memset(&info, 0, sizeof(info));
 533         if (s->level == UnSet && st && st->ss->default_geometry)
 534                 st->ss->default_geometry(st, &s->level, NULL, NULL);
 535         if (s->level == UnSet) {
 536                 pr_err("a RAID level is needed to create an array.\n");
 537                 return 1;
 538         }
 539         if (s->raiddisks < 4 && s->level == 6) {
 540                 pr_err("at least 4 raid-devices needed for level 6\n");
 541                 return 1;
 542         }
 543         if (s->raiddisks > 256 && s->level == 6) {
 544                 pr_err("no more than 256 raid-devices supported for level 6\n");
 545                 return 1;
 546         }
 547         if (s->raiddisks < 2 && s->level >= 4) {
 548                 pr_err("at least 2 raid-devices needed for level %d\n", s->level);
 549                 return 1;
 550         }
 551         if (s->level <= 0 && s->sparedisks) {
 552                 pr_err("This level does not support spare devices\n");
 553                 return 1;
 554         }
 555
 556         if (subdevs == 1 && strcmp(devlist->devname, "missing") != 0) {
 557                 /* If given a single device, it might be a container, and we can
 558                  * extract a device list from there
 559                  */
 560                 int fd;
 561
 562                 memset(&inf, 0, sizeof(inf));
 563                 fd = open(devlist->devname, O_RDONLY);
 564                 if (fd >= 0 &&
 565                     md_get_array_info(fd, &inf) == 0 && inf.raid_disks == 0) {
 566                         /* yep, looks like a container */
 567                         if (st) {
 568                                 rv = st->ss->load_container(st, fd,
 569                                                             devlist->devname);
 570                                 if (rv == 0)
 571                                         have_container = 1;
 572                         } else {
 573                                 st = super_by_fd(fd, NULL);
 574                                 if (st && !(rv = st->ss->
 575                                             load_container(st, fd,
 576                                                            devlist->devname)))
 577                                         have_container = 1;
 578                                 else
 579                                         st = NULL;
 580                         }
 581                         if (have_container) {
 582                                 subdevs = s->raiddisks;
 583                                 first_missing = subdevs * 2;
 584                                 second_missing = subdevs * 2;
 585                                 insert_point = subdevs * 2;
 586                         }
 587                 }
 588                 if (fd >= 0)
 589                         close(fd);
 590         }
 591         if (st && st->ss->external && s->sparedisks) {
 592                 pr_err("This metadata type does not support spare disks at create time\n");
 593                 return 1;
 594         }
 595         if (subdevs > s->raiddisks+s->sparedisks+s->journaldisks) {
 596                 pr_err("You have listed more devices (%d) than are in the array(%d)!\n", subdevs, s->raiddisks+s->sparedisks);
 597                 return 1;
 598         }
 599         if (!have_container && subdevs < s->raiddisks+s->sparedisks+s->journaldisks) {
 600                 pr_err("You haven't given enough devices (real or missing) to create this array\n");
 601                 return 1;
 602         }
 603         if (s->bitmap_file && s->level <= 0) {
 604                 pr_err("bitmaps not meaningful with level %s\n",
 605                         map_num(pers, s->level)?:"given");
 606                 return 1;
 607         }
 608
 609         /* now set some defaults */
 610
 611         if (s->layout == UnSet) {
 612                 do_default_layout = 1;
 613                 s->layout = default_layout(st, s->level, c->verbose);
 614         }
 615
 616         if (s->level == 10)
 617                 /* check layout fits in array*/
 618                 if ((s->layout&255) * ((s->layout>>8)&255) > s->raiddisks) {
 619                         pr_err("that layout requires at least %d devices\n",
 620                                 (s->layout&255) * ((s->layout>>8)&255));
 621                         return 1;
 622                 }
 623
 624         switch(s->level) {
 625         case 4:
 626         case 5:
 627         case 10:
 628         case 6:
 629         case 0:
 630                 if (s->chunk == 0 || s->chunk == UnSet) {
 631                         s->chunk = UnSet;
 632                         do_default_chunk = 1;
 633                         /* chunk will be set later */
 634                 }
 635                 break;
 636         case LEVEL_LINEAR:
 637                 /* a chunksize of zero 0s perfectly valid (and preferred) since 2.6.16 */
 638                 break;
 639         case 1:
 640         case LEVEL_FAULTY:
 641         case LEVEL_MULTIPATH:
 642         case LEVEL_CONTAINER:
 643                 if (s->chunk) {
 644                         pr_err("specifying chunk size is forbidden for this level\n");
 645                         return 1;
 646                 }
 647                 break;
 648         default:
 649                 pr_err("unknown level %d\n", s->level);
 650                 return 1;
 651         }
 652
 653         if (s->size == MAX_SIZE)
 654                 /* use '0' to mean 'max' now... */
 655                 s->size = 0;
 656         if (s->size && s->chunk && s->chunk != UnSet)
 657                 if (round_size_and_verify(&s->size, s->chunk))
 658                         return 1;
 659
 660         newsize = s->size * 2;
 661         if (st && ! st->ss->validate_geometry(st, s->level, s->layout, s->raiddisks,
 662                                               &s->chunk, s->size*2,
 663                                               s->data_offset, NULL,
 664                                               &newsize, s->consistency_policy,
 665                                               c->verbose >= 0))
 666                 return 1;
 667
 668         if (s->chunk && s->chunk != UnSet) {
 669                 newsize &= ~(unsigned long long)(s->chunk*2 - 1);
 670                 if (do_default_chunk) {
 671                         /* default chunk was just set */
 672                         if (c->verbose > 0)
 673                                 pr_err("chunk size defaults to %dK\n", s->chunk);
 674                         if (round_size_and_verify(&s->size, s->chunk))
 675                                 return 1;
 676                         do_default_chunk = 0;
 677                 }
 678         }
 679
 680         if (s->size == 0) {
 681                 s->size = newsize / 2;
 682                 if (s->level == 1)
 683                         /* If this is ever reshaped to RAID5, we will
 684                          * need a chunksize.  So round it off a bit
 685                          * now just to be safe
 686                          */
 687                         s->size &= ~(64ULL-1);
 688
 689                 if (s->size && c->verbose > 0)
 690                         pr_err("setting size to %lluK\n", s->size);
 691         }
 692
 693         /* now look at the subdevs */
 694         info.array.active_disks = 0;
 695         info.array.working_disks = 0;
 696         dnum = 0;
 697         for (dv = devlist; dv; dv = dv->next)
 698                 if (s->data_offset == VARIABLE_OFFSET)
 699                         dv->data_offset = INVALID_SECTORS;
 700                 else
 701                         dv->data_offset = s->data_offset;
 702
 703         for (dv=devlist; dv && !have_container; dv=dv->next, dnum++) {
 704                 char *dname = dv->devname;
 705                 unsigned long long freesize;
 706                 int dfd;
 707                 char *doff;
 708
 709                 if (strcasecmp(dname, "missing") == 0) {
 710                         if (first_missing > dnum)
 711                                 first_missing = dnum;
 712                         if (second_missing > dnum && dnum > first_missing)
 713                                 second_missing = dnum;
 714                         missing_disks ++;
 715                         continue;
 716                 }
 717                 if (s->data_offset == VARIABLE_OFFSET) {
 718                         doff = strchr(dname, ':');
 719                         if (doff) {
 720                                 *doff++ = 0;
 721                                 dv->data_offset = parse_size(doff);
 722                         } else
 723                                 dv->data_offset = INVALID_SECTORS;
 724                 } else
 725                         dv->data_offset = s->data_offset;
 726
 727                 dfd = open(dname, O_RDONLY);
 728                 if (dfd < 0) {
 729                         pr_err("cannot open %s: %s\n",
 730                                 dname, strerror(errno));
 731                         exit(2);
 732                 }
 733                 if (!fstat_is_blkdev(dfd, dname, NULL)) {
 734                         close(dfd);
 735                         exit(2);
 736                 }
 737                 close(dfd);
 738                 info.array.working_disks++;
 739                 if (dnum < s->raiddisks && dv->disposition != 'j')
 740                         info.array.active_disks++;
 741                 if (st == NULL) {
 742                         struct createinfo *ci = conf_get_create_info();
 743                         if (ci)
 744                                 st = ci->supertype;
 745                 }
 746                 if (st == NULL) {
 747                         /* Need to choose a default metadata, which is different
 748                          * depending on geometry of array.
 749                          */
 750                         int i;
 751                         char *name = "default";
 752                         for(i = 0; !st && superlist[i]; i++) {
 753                                 st = superlist[i]->match_metadata_desc(name);
 754                                 if (!st)
 755                                         continue;
 756                                 if (do_default_layout)
 757                                         s->layout = default_layout(st, s->level, c->verbose);
 758                                 switch (st->ss->validate_geometry(
 759                                                 st, s->level, s->layout, s->raiddisks,
 760                                                 &s->chunk, s->size*2,
 761                                                 dv->data_offset, dname,
 762                                                 &freesize, s->consistency_policy,
 763                                                 c->verbose > 0)) {
 764                                 case -1: /* Not valid, message printed, and not
 765                                           * worth checking any further */
 766                                         exit(2);
 767                                         break;
 768                                 case 0: /* Geometry not valid */
 769                                         free(st);
 770                                         st = NULL;
 771                                         s->chunk = do_default_chunk ? UnSet : s->chunk;
 772                                         break;
 773                                 case 1: /* All happy */
 774                                         break;
 775                                 }
 776                         }
 777
 778                         if (!st) {
 779                                 int dfd = open(dname, O_RDONLY|O_EXCL);
 780                                 if (dfd < 0) {
 781                                         pr_err("cannot open %s: %s\n",
 782                                                 dname, strerror(errno));
 783                                         exit(2);
 784                                 }
 785                                 pr_err("device %s not suitable for any style of array\n",
 786                                         dname);
 787                                 exit(2);
 788                         }
 789                         if (st->ss != &super0 ||
 790                             st->minor_version != 90)
 791                                 did_default = 1;
 792                 } else {
 793                         if (do_default_layout)
 794                                 s->layout = default_layout(st, s->level, 0);
 795                         if (!st->ss->validate_geometry(st, s->level, s->layout,
 796                                                        s->raiddisks,
 797                                                        &s->chunk, s->size*2,
 798                                                        dv->data_offset,
 799                                                        dname, &freesize,
 800                                                        s->consistency_policy,
 801                                                        c->verbose >= 0)) {
 802
 803                                 pr_err("%s is not suitable for this array.\n",
 804                                        dname);
 805                                 fail = 1;
 806                                 continue;
 807                         }
 808                 }
 809
 810                 if (dv->disposition == 'j')
 811                         goto skip_size_check;  /* skip write journal for size check */
 812
 813                 freesize /= 2; /* convert to K */
 814                 if (s->chunk && s->chunk != UnSet) {
 815                         /* round to chunk size */
 816                         freesize = freesize & ~(s->chunk-1);
 817                         if (do_default_chunk) {
 818                                 /* default chunk was just set */
 819                                 if (c->verbose > 0)
 820                                         pr_err("chunk size defaults to %dK\n", s->chunk);
 821                                 if (round_size_and_verify(&s->size, s->chunk))
 822                                         return 1;
 823                                 do_default_chunk = 0;
 824                         }
 825                 }
 826                 if (!freesize) {
 827                         pr_err("no free space left on %s\n", dname);
 828                         fail = 1;
 829                         continue;
 830                 }
 831
 832                 if (s->size && freesize < s->size) {
 833                         pr_err("%s is smaller than given size. %lluK < %lluK + metadata\n",
 834                                 dname, freesize, s->size);
 835                         fail = 1;
 836                         continue;
 837                 }
 838                 if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
 839                         maxdisc = dname;
 840                         maxsize = freesize;
 841                 }
 842                 if (mindisc ==NULL || (mindisc && freesize < minsize)) {
 843                         mindisc = dname;
 844                         minsize = freesize;
 845                 }
 846         skip_size_check:
 847                 if (c->runstop != 1 || c->verbose >= 0) {
 848                         int fd = open(dname, O_RDONLY);
 849                         if (fd < 0) {
 850                                 pr_err("Cannot open %s: %s\n",
 851                                         dname, strerror(errno));
 852                                 fail = 1;
 853                                 continue;
 854                         }
 855                         warn |= check_ext2(fd, dname);
 856                         warn |= check_reiser(fd, dname);
 857                         warn |= check_raid(fd, dname);
 858                         if (strcmp(st->ss->name, "1.x") == 0 &&
 859                             st->minor_version >= 1)
 860                                 /* metadata at front */
 861                                 warn |= check_partitions(fd, dname, 0, 0);
 862                         else if (s->level == 1 || is_container(s->level) ||
 863                                  (s->level == 0 && s->raiddisks == 1))
 864                                 /* partitions could be meaningful */
 865                                 warn |= check_partitions(fd, dname, freesize*2, s->size*2);
 866                         else
 867                                 /* partitions cannot be meaningful */
 868                                 warn |= check_partitions(fd, dname, 0, 0);
 869                         if (strcmp(st->ss->name, "1.x") == 0 &&
 870                             st->minor_version >= 1 &&
 871                             did_default &&
 872                             s->level == 1 &&
 873                             (warn & 1024) == 0) {
 874                                 warn |= 1024;
 875                                 pr_err("Note: this array has metadata at the start and\n"
 876                                         "    may not be suitable as a boot device.  If you plan to\n"
 877                                         "    store '/boot' on this device please ensure that\n"
 878                                         "    your boot-loader understands md/v1.x metadata, or use\n"
 879                                         "    --metadata=0.90\n");
 880                         }
 881                         close(fd);
 882                 }
 883         }
 884         if (missing_disks == dnum && !have_container) {
 885                 pr_err("Subdevs can't be all missing\n");
 886                 return 1;
 887         }
 888         if (s->raiddisks + s->sparedisks > st->max_devs) {
 889                 pr_err("Too many devices: %s metadata only supports %d\n",
 890                         st->ss->name, st->max_devs);
 891                 return 1;
 892         }
 893         if (have_container)
 894                 info.array.working_disks = s->raiddisks;
 895         if (fail) {
 896                 pr_err("create aborted\n");
 897                 return 1;
 898         }
 899         if (s->size == 0) {
 900                 if (mindisc == NULL && !have_container) {
 901                         pr_err("no size and no drives given - aborting create.\n");
 902                         return 1;
 903                 }
 904                 if (s->level > 0 || s->level == LEVEL_MULTIPATH ||
 905                     s->level == LEVEL_FAULTY || st->ss->external) {
 906                         /* size is meaningful */
 907                         if (!st->ss->validate_geometry(st, s->level, s->layout,
 908                                                        s->raiddisks,
 909                                                        &s->chunk, minsize*2,
 910                                                        s->data_offset,
 911                                                        NULL, NULL,
 912                                                        s->consistency_policy, 0)) {
 913                                 pr_err("devices too large for RAID level %d\n", s->level);
 914                                 return 1;
 915                         }
 916                         s->size = minsize;
 917                         if (s->level == 1)
 918                                 /* If this is ever reshaped to RAID5, we will
 919                                  * need a chunksize.  So round it off a bit
 920                                  * now just to be safe
 921                                  */
 922                                 s->size &= ~(64ULL-1);
 923                         if (c->verbose > 0)
 924                                 pr_err("size set to %lluK\n", s->size);
 925                 }
 926         }
 927
 928         if (!s->bitmap_file &&
 929             !st->ss->external &&
 930             s->level >= 1 &&
 931             st->ss->add_internal_bitmap &&
 932             s->journaldisks == 0 &&
 933             (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
 934              s->consistency_policy != CONSISTENCY_POLICY_PPL) &&
 935             (s->write_behind || s->size > 100*1024*1024ULL)) {
 936                 if (c->verbose > 0)
 937                         pr_err("automatically enabling write-intent bitmap on large array\n");
 938                 s->bitmap_file = "internal";
 939         }
 940         if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
 941                 s->bitmap_file = NULL;
 942
 943         if (s->consistency_policy == CONSISTENCY_POLICY_PPL &&
 944             !st->ss->write_init_ppl) {
 945                 pr_err("%s metadata does not support PPL\n", st->ss->name);
 946                 return 1;
 947         }
 948
 949         if (!have_container && s->level > 0 && ((maxsize-s->size)*100 > maxsize)) {
 950                 if (c->runstop != 1 || c->verbose >= 0)
 951                         pr_err("largest drive (%s) exceeds size (%lluK) by more than 1%%\n",
 952                                 maxdisc, s->size);
 953                 warn = 1;
 954         }
 955
 956         if (st->ss->detail_platform && st->ss->detail_platform(0, 1, NULL) != 0) {
 957                 if (c->runstop != 1 || c->verbose >= 0)
 958                         pr_err("%s unable to enumerate platform support\n"
 959                                 "    array may not be compatible with hardware/firmware\n",
 960                                 st->ss->name);
 961                 warn = 1;
 962         }
 963         st->nodes = c->nodes;
 964         st->cluster_name = c->homecluster;
 965
 966         if (warn) {
 967                 if (c->runstop!= 1) {
 968                         if (!ask("Continue creating array? ")) {
 969                                 pr_err("create aborted.\n");
 970                                 return 1;
 971                         }
 972                 } else {
 973                         if (c->verbose > 0)
 974                                 pr_err("creation continuing despite oddities due to --run\n");
 975                 }
 976         }
 977
 978         /* If this is raid4/5, we want to configure the last active slot
 979          * as missing, so that a reconstruct happens (faster than re-parity)
 980          * FIX: Can we do this for raid6 as well?
 981          */
 982         if (st->ss->external == 0 && s->assume_clean == 0 &&
 983             c->force == 0 && first_missing >= s->raiddisks) {
 984                 switch (s->level) {
 985                 case 4:
 986                 case 5:
 987                         insert_point = s->raiddisks-1;
 988                         s->sparedisks++;
 989                         info.array.active_disks--;
 990                         missing_disks++;
 991                         break;
 992                 default:
 993                         break;
 994                 }
 995         }
 996         /* For raid6, if creating with 1 missing drive, make a good drive
 997          * into a spare, else the create will fail
 998          */
 999         if (s->assume_clean == 0 && c->force == 0 && first_missing < s->raiddisks &&
1000             st->ss->external == 0 &&
1001             second_missing >= s->raiddisks && s->level == 6) {
1002                 insert_point = s->raiddisks - 1;
1003                 if (insert_point == first_missing)
1004                         insert_point--;
1005                 s->sparedisks ++;
1006                 info.array.active_disks--;
1007                 missing_disks++;
1008         }
1009
1010         if (s->level <= 0 && first_missing < subdevs * 2) {
1011                 pr_err("This level does not support missing devices\n");
1012                 return 1;
1013         }
1014
1015         /* We need to create the device */
1016         map_lock(&map);
1017         mdfd = create_mddev(ident->devname, ident->name, c->autof, LOCAL, chosen_name, 1);
1018         if (mdfd < 0) {
1019                 map_unlock(&map);
1020                 return 1;
1021         }
1022         /* verify if chosen_name is not in use,
1023          * it could be in conflict with already existing device
1024          * e.g. container, array
1025          */
1026         if (strncmp(chosen_name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 &&
1027             map_by_name(&map, chosen_name + DEV_MD_DIR_LEN)) {
1028                 pr_err("Array name %s is in use already.\n", chosen_name);
1029                 close(mdfd);
1030                 map_unlock(&map);
1031                 udev_unblock();
1032                 return 1;
1033         }
1034
1035         memset(&inf, 0, sizeof(inf));
1036         md_get_array_info(mdfd, &inf);
1037         if (inf.working_disks != 0) {
1038                 pr_err("another array by this name is already running.\n");
1039                 goto abort_locked;
1040         }
1041
1042         /* Ok, lets try some ioctls */
1043
1044         info.array.level = s->level;
1045         info.array.size = s->size;
1046         info.array.raid_disks = s->raiddisks;
1047         /* The kernel should *know* what md_minor we are dealing
1048          * with, but it chooses to trust me instead. Sigh
1049          */
1050         info.array.md_minor = 0;
1051         if (fstat_is_blkdev(mdfd, chosen_name, &rdev))
1052                 info.array.md_minor = minor(rdev);
1053         info.array.not_persistent = 0;
1054
1055         if (((s->level == 4 || s->level == 5) &&
1056              (insert_point < s->raiddisks || first_missing < s->raiddisks)) ||
1057             (s->level == 6 && (insert_point < s->raiddisks ||
1058                                second_missing < s->raiddisks)) ||
1059             (s->level <= 0) || s->assume_clean) {
1060                 info.array.state = 1; /* clean, but one+ drive will be missing*/
1061                 info.resync_start = MaxSector;
1062         } else {
1063                 info.array.state = 0; /* not clean, but no errors */
1064                 info.resync_start = 0;
1065         }
1066         if (s->level == 10) {
1067                 /* for raid10, the bitmap size is the capacity of the array,
1068                  * which is array.size * raid_disks / ncopies;
1069                  * .. but convert to sectors.
1070                  */
1071                 int ncopies = ((s->layout>>8) & 255) * (s->layout & 255);
1072                 bitmapsize = s->size * s->raiddisks / ncopies * 2;
1073 /*              printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, s->size, s->raiddisks, ncopies);*/
1074         } else
1075                 bitmapsize = s->size * 2;
1076
1077         /* There is lots of redundancy in these disk counts,
1078          * raid_disks is the most meaningful value
1079          *          it describes the geometry of the array
1080          *          it is constant
1081          * nr_disks is total number of used slots.
1082          *          it should be raid_disks+spare_disks
1083          * spare_disks is the number of extra disks present
1084          *          see above
1085          * active_disks is the number of working disks in
1086          *          active slots. (With raid_disks)
1087          * working_disks is the total number of working disks,
1088          *          including spares
1089          * failed_disks is the number of disks marked failed
1090          *
1091          * Ideally, the kernel would keep these (except raid_disks)
1092          * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
1093          * So for now, we assume that all raid and spare
1094          * devices will be given.
1095          */
1096         info.array.spare_disks=s->sparedisks;
1097         info.array.failed_disks=missing_disks;
1098         info.array.nr_disks = info.array.working_disks
1099                 + info.array.failed_disks;
1100         info.array.layout = s->layout;
1101         info.array.chunk_size = s->chunk*1024;
1102
1103         if (*name == 0) {
1104                 /* base name on devname */
1105                 /*  /dev/md0 -> 0
1106                  *  /dev/md_d0 -> d0
1107                  *  /dev/md_foo -> foo
1108                  *  /dev/md/1 -> 1
1109                  *  /dev/md/d1 -> d1
1110                  *  /dev/md/home -> home
1111                  *  /dev/mdhome -> home
1112                  */
1113                 /* FIXME compare this with rules in create_mddev */
1114                 name = strrchr(chosen_name, '/');
1115
1116                 if (name) {
1117                         name++;
1118                         if (strncmp(name, "md_", 3) == 0 &&
1119                             strlen(name) > 3 && (name - chosen_name) == 5 /* /dev/ */)
1120                                 name += 3;
1121                         else if (strncmp(name, "md", 2) == 0 &&
1122                                  strlen(name) > 2 && isdigit(name[2]) &&
1123                                  (name - chosen_name) == 5 /* /dev/ */)
1124                                 name += 2;
1125                 }
1126         }
1127         if (!st->ss->init_super(st, &info.array, s, name, c->homehost, uuid,
1128                                 s->data_offset))
1129                 goto abort_locked;
1130
1131         total_slots = info.array.nr_disks;
1132         st->ss->getinfo_super(st, &info, NULL);
1133         if (sysfs_init(&info, mdfd, NULL)) {
1134                 pr_err("unable to initialize sysfs\n");
1135                 goto abort_locked;
1136         }
1137
1138         if (did_default && c->verbose >= 0) {
1139                 if (is_subarray(info.text_version)) {
1140                         char devnm[32];
1141                         char *ep;
1142                         struct mdinfo *mdi;
1143
1144                         strncpy(devnm, info.text_version+1, 32);
1145                         devnm[31] = 0;
1146                         ep = strchr(devnm, '/');
1147                         if (ep)
1148                                 *ep = 0;
1149
1150                         mdi = sysfs_read(-1, devnm, GET_VERSION);
1151
1152                         pr_info("Creating array inside %s container %s\n",
1153                                 mdi?mdi->text_version:"managed", devnm);
1154                         sysfs_free(mdi);
1155                 } else
1156                         pr_info("Defaulting to version %s metadata\n",
1157                                 info.text_version);
1158         }
1159
1160         map_update(&map, fd2devnm(mdfd), info.text_version,
1161                    info.uuid, chosen_name);
1162         /* Keep map locked until devices have been added to array
1163          * to stop another mdadm from finding and using those devices.
1164          */
1165
1166         if (s->bitmap_file && (strcmp(s->bitmap_file, "internal") == 0 ||
1167                                strcmp(s->bitmap_file, "clustered") == 0)) {
1168                 if (!st->ss->add_internal_bitmap) {
1169                         pr_err("internal bitmaps not supported with %s metadata\n",
1170                                 st->ss->name);
1171                         goto abort_locked;
1172                 }
1173                 if (st->ss->add_internal_bitmap(st, &s->bitmap_chunk,
1174                                                 c->delay, s->write_behind,
1175                                                 bitmapsize, 1, major_num)) {
1176                         pr_err("Given bitmap chunk size not supported.\n");
1177                         goto abort_locked;
1178                 }
1179                 s->bitmap_file = NULL;
1180         }
1181
1182         if (sysfs_init(&info, mdfd, NULL)) {
1183                 pr_err("unable to initialize sysfs\n");
1184                 goto abort_locked;
1185         }
1186
1187         if (st->ss->external && st->container_devnm[0]) {
1188                 /* member */
1189
1190                 /* When creating a member, we need to be careful
1191                  * to negotiate with mdmon properly.
1192                  * If it is already running, we cannot write to
1193                  * the devices and must ask it to do that part.
1194                  * If it isn't running, we write to the devices,
1195                  * and then start it.
1196                  * We hold an exclusive open on the container
1197                  * device to make sure mdmon doesn't exit after
1198                  * we checked that it is running.
1199                  *
1200                  * For now, fail if it is already running.
1201                  */
1202                 container_fd = open_dev_excl(st->container_devnm);
1203                 if (container_fd < 0) {
1204                         pr_err("Cannot get exclusive open on container - weird.\n");
1205                         goto abort_locked;
1206                 }
1207                 if (mdmon_running(st->container_devnm)) {
1208                         if (c->verbose)
1209                                 pr_err("reusing mdmon for %s.\n",
1210                                         st->container_devnm);
1211                         st->update_tail = &st->updates;
1212                 } else
1213                         need_mdmon = 1;
1214         }
1215         rv = set_array_info(mdfd, st, &info);
1216         if (rv) {
1217                 pr_err("failed to set array info for %s: %s\n", chosen_name, strerror(errno));
1218                 goto abort_locked;
1219         }
1220
1221         if (s->bitmap_file) {
1222                 int uuid[4];
1223
1224                 st->ss->uuid_from_super(st, uuid);
1225                 if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid, s->bitmap_chunk,
1226                                  c->delay, s->write_behind,
1227                                  bitmapsize,
1228                                  major_num)) {
1229                         goto abort_locked;
1230                 }
1231                 bitmap_fd = open(s->bitmap_file, O_RDWR);
1232                 if (bitmap_fd < 0) {
1233                         pr_err("weird: %s cannot be opened\n",
1234                                 s->bitmap_file);
1235                         goto abort_locked;
1236                 }
1237                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
1238                         pr_err("Cannot set bitmap file for %s: %s\n", chosen_name, strerror(errno));
1239                         goto abort_locked;
1240                 }
1241         }
1242
1243         if (add_disks(mdfd, &info, s, c, st, &map, devlist, total_slots,
1244                       have_container, insert_point, major_num, chosen_name))
1245                 goto abort_locked;
1246
1247         map_unlock(&map);
1248
1249         if (is_container(s->level)) {
1250                 /* No need to start.  But we should signal udev to
1251                  * create links */
1252                 sysfs_uevent(&info, "change");
1253                 if (c->verbose >= 0)
1254                         pr_err("container %s prepared.\n", chosen_name);
1255                 wait_for(chosen_name, mdfd);
1256         } else if (c->runstop == 1 || subdevs >= s->raiddisks) {
1257                 if (st->ss->external) {
1258                         int err;
1259                         switch(s->level) {
1260                         case LEVEL_LINEAR:
1261                         case LEVEL_MULTIPATH:
1262                         case 0:
1263                                 err = sysfs_set_str(&info, NULL, "array_state",
1264                                                     c->readonly
1265                                                     ? "readonly"
1266                                                     : "active");
1267                                 need_mdmon = 0;
1268                                 break;
1269                         default:
1270                                 err = sysfs_set_str(&info, NULL, "array_state",
1271                                                     "readonly");
1272                                 break;
1273                         }
1274                         sysfs_set_safemode(&info, info.safe_mode_delay);
1275                         if (err) {
1276                                 pr_err("failed to activate array.\n");
1277                                 ioctl(mdfd, STOP_ARRAY, NULL);
1278                                 goto abort;
1279                         }
1280                 } else if (c->readonly &&
1281                            sysfs_attribute_available(
1282                                    &info, NULL, "array_state")) {
1283                         if (sysfs_set_str(&info, NULL,
1284                                           "array_state", "readonly") < 0) {
1285                                 pr_err("Failed to start array: %s\n",
1286                                        strerror(errno));
1287                                 ioctl(mdfd, STOP_ARRAY, NULL);
1288                                 goto abort;
1289                         }
1290                 } else {
1291                         /* param is not actually used */
1292                         mdu_param_t param;
1293                         if (ioctl(mdfd, RUN_ARRAY, &param)) {
1294                                 pr_err("RUN_ARRAY failed: %s\n",
1295                                        strerror(errno));
1296                                 if (errno == 524 /* ENOTSUP */ &&
1297                                     info.array.level == 0)
1298                                         cont_err("Please use --layout=original or --layout=alternate\n");
1299                                 if (info.array.chunk_size & (info.array.chunk_size-1)) {
1300                                         cont_err("Problem may be that chunk size is not a power of 2\n");
1301                                 }
1302                                 ioctl(mdfd, STOP_ARRAY, NULL);
1303                                 goto abort;
1304                         }
1305                         /* if start_ro module parameter is set, array is
1306                          * auto-read-only, which is bad as the resync won't
1307                          * start.  So lets make it read-write now.
1308                          */
1309                         ioctl(mdfd, RESTART_ARRAY_RW, NULL);
1310                 }
1311                 if (c->verbose >= 0)
1312                         pr_info("array %s started.\n", chosen_name);
1313                 if (st->ss->external && st->container_devnm[0]) {
1314                         if (need_mdmon)
1315                                 start_mdmon(st->container_devnm);
1316
1317                         ping_monitor(st->container_devnm);
1318                         close(container_fd);
1319                 }
1320                 wait_for(chosen_name, mdfd);
1321         } else {
1322                 pr_err("not starting array - not enough devices.\n");
1323         }
1324         udev_unblock();
1325         close(mdfd);
1326         sysfs_uevent(&info, "change");
1327         return 0;
1328
1329  abort:
1330         udev_unblock();
1331         map_lock(&map);
1332  abort_locked:
1333         map_remove(&map, fd2devnm(mdfd));
1334         map_unlock(&map);
1335
1336         if (mdfd >= 0)
1337                 close(mdfd);
1338         return 1;
1339 }