Assemble.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   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@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #include        "mdadm.h"
  31
  32 int Assemble(struct supertype *st, char *mddev, int mdfd,
  33              mddev_ident_t ident, char *conffile,
  34              mddev_dev_t devlist,
  35              int readonly, int runstop,
  36              char *update,
  37              int verbose, int force)
  38 {
  39         /*
  40          * The task of Assemble is to find a collection of
  41          * devices that should (according to their superblocks)
  42          * form an array, and to give this collection to the MD driver.
  43          * In Linux-2.4 and later, this involves submitting a
  44          * SET_ARRAY_INFO ioctl with no arg - to prepare
  45          * the array - and then submit a number of
  46          * ADD_NEW_DISK ioctls to add disks into
  47          * the array.  Finally RUN_ARRAY might
  48          * be submitted to start the array.
  49          *
  50          * Much of the work of Assemble is in finding and/or
  51          * checking the disks to make sure they look right.
  52          *
  53          * If mddev is not set, then scan must be set and we
  54          *  read through the config file for dev+uuid mapping
  55          *  We recurse, setting mddev, for each device that
  56          *    - isn't running
  57          *    - has a valid uuid (or any uuid if !uuidset)
  58          *
  59          * If mddev is set, we try to determine state of md.
  60          *   check version - must be at least 0.90.0
  61          *   check kernel version.  must be at least 2.4.
  62          *    If not, we can possibly fall back on START_ARRAY
  63          *   Try to GET_ARRAY_INFO.
  64          *     If possible, give up
  65          *     If not, try to STOP_ARRAY just to make sure
  66          *
  67          * If !uuidset and scan, look in conf-file for uuid
  68          *       If not found, give up
  69          * If !devlist and scan and uuidset, get list of devs from conf-file
  70          *
  71          * For each device:
  72          *   Check superblock - discard if bad
  73          *   Check uuid (set if we don't have one) - discard if no match
  74          *   Check superblock similarity if we have a superblock - discard if different
  75          *   Record events, devicenum
  76          * This should give us a list of devices for the array
  77          * We should collect the most recent event number
  78          *
  79          * Count disks with recent enough event count
  80          * While force && !enough disks
  81          *    Choose newest rejected disks, update event count
  82          *     mark clean and rewrite superblock
  83          * If recent kernel:
  84          *    SET_ARRAY_INFO
  85          *    foreach device with recent events : ADD_NEW_DISK
  86          *    if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
  87          * If old kernel:
  88          *    Check the device numbers in superblock are right
  89          *    update superblock if any changes
  90          *    START_ARRAY
  91          *
  92          */
  93         int old_linux = 0;
  94         int vers;
  95         void *first_super = NULL, *super = NULL;
  96         struct {
  97                 char *devname;
  98                 unsigned int major, minor;
  99                 unsigned int oldmajor, oldminor;
 100                 long long events;
 101                 int uptodate;
 102                 int state;
 103                 int raid_disk;
 104                 int disk_nr;
 105         } *devices;
 106         int *best = NULL; /* indexed by raid_disk */
 107         unsigned int bestcnt = 0;
 108         int devcnt = 0;
 109         unsigned int okcnt, sparecnt;
 110         unsigned int req_cnt;
 111         unsigned int i;
 112         int most_recent = 0;
 113         int chosen_drive;
 114         int change = 0;
 115         int inargv = 0;
 116         int start_partial_ok = force || devlist==NULL;
 117         unsigned int num_devs;
 118         mddev_dev_t tmpdev;
 119         struct mdinfo info;
 120         struct mddev_ident_s ident2;
 121         char *avail;
 122         int nextspare = 0;
 123
 124         vers = md_get_version(mdfd);
 125         if (vers <= 0) {
 126                 fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
 127                 return 1;
 128         }
 129         if (vers < 9000) {
 130                 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
 131                         "    Upgrade your kernel or try --build\n");
 132                 return 1;
 133         }
 134         if (get_linux_version() < 2004000)
 135                 old_linux = 1;
 136
 137         if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
 138                 fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
 139                         mddev);
 140                 return 1;
 141         }
 142         ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
 143
 144         /*
 145          * If any subdevs are listed, then any that don't
 146          * match ident are discarded.  Remainder must all match and
 147          * become the array.
 148          * If no subdevs, then we scan all devices in the config file, but
 149          * there must be something in the identity
 150          */
 151
 152         if (!devlist &&
 153             ident->uuid_set == 0 &&
 154             ident->super_minor < 0 &&
 155             ident->devices == NULL) {
 156                 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
 157                         mddev);
 158                 return 1;
 159         }
 160         if (devlist == NULL)
 161                 devlist = conf_get_devs(conffile);
 162         else inargv = 1;
 163
 164         tmpdev = devlist; num_devs = 0;
 165         while (tmpdev) {
 166                 num_devs++;
 167                 tmpdev = tmpdev->next;
 168         }
 169         devices = malloc(num_devs * sizeof(*devices));
 170
 171         if (!st && ident->st) st = ident->st;
 172
 173         if (verbose>0)
 174             fprintf(stderr, Name ": looking for devices for %s\n",
 175                     mddev);
 176
 177         while ( devlist) {
 178                 char *devname;
 179                 int dfd;
 180                 struct stat stb;
 181                 struct supertype *tst = st;
 182
 183                 devname = devlist->devname;
 184                 devlist = devlist->next;
 185
 186                 if (ident->devices &&
 187                     !match_oneof(ident->devices, devname)) {
 188                         if ((inargv && verbose>=0) || verbose > 0)
 189                                 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
 190                         continue;
 191                 }
 192
 193                 if (super) {
 194                         free(super);
 195                         super = NULL;
 196                 }
 197
 198                 dfd = open(devname, O_RDONLY|O_EXCL, 0);
 199                 if (dfd < 0) {
 200                         if ((inargv && verbose >= 0) || verbose > 0)
 201                                 fprintf(stderr, Name ": cannot open device %s: %s\n",
 202                                         devname, strerror(errno));
 203                 } else if (fstat(dfd, &stb)< 0) {
 204                         /* Impossible! */
 205                         fprintf(stderr, Name ": fstat failed for %s: %s\n",
 206                                 devname, strerror(errno));
 207                         close(dfd);
 208                 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 209                         fprintf(stderr, Name ": %s is not a block device.\n",
 210                                 devname);
 211                         close(dfd);
 212                 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
 213                         if ((inargv && verbose >= 0) || verbose > 0)
 214                                 fprintf(stderr, Name ": no recogniseable superblock\n");
 215                 } else if (tst->ss->load_super(tst,dfd, &super, NULL)) {
 216                         if ((inargv && verbose >= 0) || verbose > 0)
 217                                 fprintf( stderr, Name ": no RAID superblock on %s\n",
 218                                          devname);
 219                         close(dfd);
 220                 } else {
 221                         tst->ss->getinfo_super(&info, &ident2, super);
 222                         close(dfd);
 223                 }
 224
 225                 if (ident->uuid_set &&
 226                     (!super || same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
 227                         if ((inargv && verbose >= 0) || verbose > 0)
 228                                 fprintf(stderr, Name ": %s has wrong uuid.\n",
 229                                         devname);
 230                         continue;
 231                 }
 232                 if (ident->name[0] &&
 233                     (!super || strncmp(ident2.name, ident->name, 32)!=0)) {
 234                         if ((inargv && verbose >= 0) || verbose > 0)
 235                                 fprintf(stderr, Name ": %s has wrong name.\n",
 236                                         devname);
 237                         continue;
 238                 }
 239                 if (ident->super_minor != UnSet &&
 240                     (!super || ident->super_minor != info.array.md_minor)) {
 241                         if ((inargv && verbose >= 0) || verbose > 0)
 242                                 fprintf(stderr, Name ": %s has wrong super-minor.\n",
 243                                         devname);
 244                         continue;
 245                 }
 246                 if (ident->level != UnSet &&
 247                     (!super|| ident->level != info.array.level)) {
 248                         if ((inargv && verbose >= 0) || verbose > 0)
 249                                 fprintf(stderr, Name ": %s has wrong raid level.\n",
 250                                         devname);
 251                         continue;
 252                 }
 253                 if (ident->raid_disks != UnSet &&
 254                     (!super || ident->raid_disks!= info.array.raid_disks)) {
 255                         if ((inargv && verbose >= 0) || verbose > 0)
 256                                 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
 257                                         devname);
 258                         continue;
 259                 }
 260
 261                 /* If we are this far, then we are commited to this device.
 262                  * If the super_block doesn't exist, or doesn't match others,
 263                  * then we cannot continue
 264                  */
 265
 266                 if (!super) {
 267                         fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
 268                                 devname);
 269                         free(first_super);
 270                         return 1;
 271                 }
 272                 st = tst; /* commit to this format, if haven't already */
 273                 if (st->ss->compare_super(&first_super, super)) {
 274                         fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
 275                                 devname);
 276                         free(super);
 277                         free(first_super);
 278                         return 1;
 279                 }
 280
 281                 /* looks like a good enough match to update the super block if needed */
 282                 if (update) {
 283                         /* prepare useful information in info structures */
 284                         struct stat stb2;
 285                         fstat(mdfd, &stb2);
 286                         info.array.md_minor = minor(stb2.st_rdev);
 287
 288                         st->ss->update_super(&info, super, update, devname, verbose);
 289
 290                         dfd = open(devname, O_RDWR|O_EXCL, 0);
 291                         if (dfd < 0)
 292                                 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
 293                                         devname);
 294                         else if (st->ss->store_super(st, dfd, super))
 295                                 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
 296                                         devname);
 297                         if (dfd >= 0)
 298                                 close(dfd);
 299                 }
 300
 301                 if (verbose > 0)
 302                         fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
 303                                 devname, mddev, info.disk.raid_disk);
 304                 devices[devcnt].devname = devname;
 305                 devices[devcnt].major = major(stb.st_rdev);
 306                 devices[devcnt].minor = minor(stb.st_rdev);
 307                 devices[devcnt].oldmajor = info.disk.major;
 308                 devices[devcnt].oldminor = info.disk.minor;
 309                 devices[devcnt].events = info.events;
 310                 devices[devcnt].raid_disk = info.disk.raid_disk;
 311                 devices[devcnt].disk_nr = info.disk.number;
 312                 devices[devcnt].uptodate = 0;
 313                 devices[devcnt].state = info.disk.state;
 314                 if (most_recent < devcnt) {
 315                         if (devices[devcnt].events
 316                             > devices[most_recent].events)
 317                                 most_recent = devcnt;
 318                 }
 319                 if (info.array.level == -4)
 320                         /* with multipath, the raid_disk from the superblock is meaningless */
 321                         i = devcnt;
 322                 else
 323                         i = devices[devcnt].raid_disk;
 324                 if (i+1 == 0) {
 325                         if (nextspare < info.array.raid_disks)
 326                                 nextspare = info.array.raid_disks;
 327                         i = nextspare++;
 328                 }
 329                 if (i < 10000) {
 330                         if (i >= bestcnt) {
 331                                 unsigned int newbestcnt = i+10;
 332                                 int *newbest = malloc(sizeof(int)*newbestcnt);
 333                                 unsigned int c;
 334                                 for (c=0; c < newbestcnt; c++)
 335                                         if (c < bestcnt)
 336                                                 newbest[c] = best[c];
 337                                         else
 338                                                 newbest[c] = -1;
 339                                 if (best)free(best);
 340                                 best = newbest;
 341                                 bestcnt = newbestcnt;
 342                         }
 343                         if (best[i] == -1
 344                             || devices[best[i]].events < devices[devcnt].events)
 345                                 best[i] = devcnt;
 346                 }
 347                 devcnt++;
 348         }
 349
 350         if (super)
 351                 free(super);
 352         super = NULL;
 353
 354         if (update && strcmp(update, "byteorder")==0)
 355                 st->minor_version = 90;
 356
 357         if (devcnt == 0) {
 358                 fprintf(stderr, Name ": no devices found for %s\n",
 359                         mddev);
 360                 free(first_super);
 361                 return 1;
 362         }
 363
 364         st->ss->getinfo_super(&info, &ident2, first_super);
 365
 366         /* now we have some devices that might be suitable.
 367          * I wonder how many
 368          */
 369         avail = malloc(info.array.raid_disks);
 370         memset(avail, 0, info.array.raid_disks);
 371         okcnt = 0;
 372         sparecnt=0;
 373         for (i=0; i< bestcnt ;i++) {
 374                 int j = best[i];
 375                 int event_margin = !force;
 376                 if (j < 0) continue;
 377                 /* note: we ignore error flags in multipath arrays
 378                  * as they don't make sense
 379                  */
 380                 if (info.array.level != -4)
 381                         if (!(devices[j].state & (1<<MD_DISK_SYNC))) {
 382                                 if (!(devices[j].state & (1<<MD_DISK_FAULTY)))
 383                                         sparecnt++;
 384                                 continue;
 385                         }
 386                 if (devices[j].events+event_margin >=
 387                     devices[most_recent].events) {
 388                         devices[j].uptodate = 1;
 389                         if (i < info.array.raid_disks) {
 390                                 okcnt++;
 391                                 avail[i]=1;
 392                         } else
 393                                 sparecnt++;
 394                 }
 395         }
 396         while (force && !enough(info.array.level, info.array.raid_disks,
 397                                 info.array.layout,
 398                                 avail, okcnt)) {
 399                 /* Choose the newest best drive which is
 400                  * not up-to-date, update the superblock
 401                  * and add it.
 402                  */
 403                 int fd;
 404                 chosen_drive = -1;
 405                 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
 406                         int j = best[i];
 407                         if (j>=0 &&
 408                             !devices[j].uptodate &&
 409                             devices[j].events > 0 &&
 410                             (chosen_drive < 0 ||
 411                              devices[j].events > devices[chosen_drive].events))
 412                                 chosen_drive = j;
 413                 }
 414                 if (chosen_drive < 0)
 415                         break;
 416                 if (verbose >= 0)
 417                         fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
 418                                 devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
 419                                 (int)(devices[chosen_drive].events),
 420                                 (int)(devices[most_recent].events));
 421                 fd = open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 422                 if (fd < 0) {
 423                         fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
 424                                 devices[chosen_drive].devname);
 425                         devices[chosen_drive].events = 0;
 426                         continue;
 427                 }
 428                 if (st->ss->load_super(st,fd, &super, NULL)) {
 429                         close(fd);
 430                         fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
 431                                 devices[chosen_drive].devname);
 432                         devices[chosen_drive].events = 0;
 433                         continue;
 434                 }
 435                 info.events = devices[most_recent].events;
 436                 st->ss->update_super(&info, super, "force", devices[chosen_drive].devname, verbose);
 437
 438                 if (st->ss->store_super(st, fd, super)) {
 439                         close(fd);
 440                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 441                                 devices[chosen_drive].devname);
 442                         devices[chosen_drive].events = 0;
 443                         free(super);
 444                         continue;
 445                 }
 446                 close(fd);
 447                 devices[chosen_drive].events = devices[most_recent].events;
 448                 devices[chosen_drive].uptodate = 1;
 449                 avail[chosen_drive] = 1;
 450                 okcnt++;
 451                 free(super);
 452         }
 453
 454         /* Now we want to look at the superblock which the kernel will base things on
 455          * and compare the devices that we think are working with the devices that the
 456          * superblock thinks are working.
 457          * If there are differences and --force is given, then update this chosen
 458          * superblock.
 459          */
 460         chosen_drive = -1;
 461         super = NULL;
 462         for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
 463                 int j = best[i];
 464                 int fd;
 465
 466                 if (j<0)
 467                         continue;
 468                 if (!devices[j].uptodate)
 469                         continue;
 470                 chosen_drive = j;
 471                 if ((fd=open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
 472                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 473                                 devices[j].devname, strerror(errno));
 474                         return 1;
 475                 }
 476                 if (st->ss->load_super(st,fd, &super, NULL)) {
 477                         close(fd);
 478                         fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
 479                                 devices[j].devname);
 480                         return 1;
 481                 }
 482                 close(fd);
 483         }
 484         if (super == NULL) {
 485                 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
 486                 return 1;
 487         }
 488         st->ss->getinfo_super(&info, &ident2, super);
 489         for (i=0; i<bestcnt; i++) {
 490                 int j = best[i];
 491                 unsigned int desired_state;
 492
 493                 if (i < info.array.raid_disks)
 494                         desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
 495                 else
 496                         desired_state = 0;
 497
 498                 if (j<0)
 499                         continue;
 500                 if (!devices[j].uptodate)
 501                         continue;
 502                 info.disk.number = devices[j].disk_nr;
 503                 info.disk.raid_disk = i;
 504                 info.disk.state = desired_state;
 505
 506                 if (devices[j].uptodate &&
 507                     st->ss->update_super(&info, super, "assemble", NULL, verbose)) {
 508                         if (force) {
 509                                 if (verbose >= 0)
 510                                         fprintf(stderr, Name ": "
 511                                                 "clearing FAULTY flag for device %d in %s for %s\n",
 512                                                 j, mddev, devices[j].devname);
 513                                 change = 1;
 514                         } else {
 515                                 if (verbose >= -1)
 516                                         fprintf(stderr, Name ": "
 517                                                 "device %d in %s has wrong state in superblock, but %s seems ok\n",
 518                                                 i, mddev, devices[j].devname);
 519                         }
 520                 }
 521 #if 0
 522                 if (!devices[j].uptodate &&
 523                     !(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
 524                         fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
 525                                 i, mddev);
 526                 }
 527 #endif
 528         }
 529         if (force && okcnt == info.array.raid_disks-1) {
 530                 /* FIXME check event count */
 531                 change += st->ss->update_super(&info, super, "force",
 532                                         devices[chosen_drive].devname, verbose);
 533         }
 534
 535         if (change) {
 536                 int fd;
 537                 fd = open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 538                 if (fd < 0) {
 539                         fprintf(stderr, Name ": Could open %s for write - cannot Assemble array.\n",
 540                                 devices[chosen_drive].devname);
 541                         return 1;
 542                 }
 543                 if (st->ss->store_super(st, fd, super)) {
 544                         close(fd);
 545                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 546                                 devices[chosen_drive].devname);
 547                         return 1;
 548                 }
 549                 close(fd);
 550         }
 551
 552         /* count number of in-sync devices according to the superblock.
 553          * We must have this number to start the array without -s or -R
 554          */
 555         req_cnt = info.array.working_disks;
 556
 557         /* Almost ready to actually *do* something */
 558         if (!old_linux) {
 559                 int rv;
 560                 if ((vers % 100) >= 1) { /* can use different versions */
 561                         mdu_array_info_t inf;
 562                         memset(&inf, 0, sizeof(inf));
 563                         inf.major_version = st->ss->major;
 564                         inf.minor_version = st->minor_version;
 565                         rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
 566                 } else
 567                         rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
 568
 569                 if (rv) {
 570                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 571                                 mddev, strerror(errno));
 572                         return 1;
 573                 }
 574                 if (ident->bitmap_fd >= 0) {
 575                         if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
 576                                 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
 577                                 return 1;
 578                         }
 579                 }
 580
 581                 /* First, add the raid disks, but add the chosen one last */
 582                 for (i=0; i<= bestcnt; i++) {
 583                         int j;
 584                         if (i < bestcnt) {
 585                                 j = best[i];
 586                                 if (j == chosen_drive)
 587                                         continue;
 588                         } else
 589                                 j = chosen_drive;
 590
 591                         if (j >= 0 /* && devices[j].uptodate */) {
 592                                 mdu_disk_info_t disk;
 593                                 memset(&disk, 0, sizeof(disk));
 594                                 disk.major = devices[j].major;
 595                                 disk.minor = devices[j].minor;
 596                                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
 597                                         fprintf(stderr, Name ": failed to add %s to %s: %s\n",
 598                                                 devices[j].devname,
 599                                                 mddev,
 600                                                 strerror(errno));
 601                                         if (i < info.array.raid_disks || i == bestcnt)
 602                                                 okcnt--;
 603                                         else
 604                                                 sparecnt--;
 605                                 } else if (verbose > 0)
 606                                         fprintf(stderr, Name ": added %s to %s as %d\n",
 607                                                 devices[j].devname, mddev, devices[j].raid_disk);
 608                         } else if (verbose > 0 && i < info.array.raid_disks)
 609                                 fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
 610                                         i, mddev);
 611                 }
 612
 613                 if (runstop == 1 ||
 614                     (runstop == 0 &&
 615                      ( enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt) &&
 616                        (okcnt >= req_cnt || start_partial_ok)
 617                              ))) {
 618                         if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
 619                                 if (verbose >= 0) {
 620                                         fprintf(stderr, Name ": %s has been started with %d drive%s",
 621                                                 mddev, okcnt, okcnt==1?"":"s");
 622                                         if (okcnt < info.array.raid_disks)
 623                                                 fprintf(stderr, " (out of %d)", info.array.raid_disks);
 624                                         if (sparecnt)
 625                                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 626                                         fprintf(stderr, ".\n");
 627                                 }
 628                                 return 0;
 629                         }
 630                         fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
 631                                 mddev, strerror(errno));
 632                         return 1;
 633                 }
 634                 if (runstop == -1) {
 635                         fprintf(stderr, Name ": %s assembled from %d drive%s, but not started.\n",
 636                                 mddev, okcnt, okcnt==1?"":"s");
 637                         return 0;
 638                 }
 639                 if (verbose >= 0) {
 640                         fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
 641                         if (sparecnt)
 642                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 643                         if (!enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt))
 644                                 fprintf(stderr, " - not enough to start the array.\n");
 645                         else {
 646                                 if (req_cnt == info.array.raid_disks)
 647                                         fprintf(stderr, " - need all %d to start it", req_cnt);
 648                                 else
 649                                         fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
 650                                 fprintf(stderr, " (use --run to insist).\n");
 651                         }
 652                 }
 653                 return 1;
 654         } else {
 655                 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
 656                  * been updated to point to the current locations of devices.
 657                  * so we can just start the array
 658                  */
 659                 unsigned long dev;
 660                 dev = makedev(devices[chosen_drive].major,
 661                             devices[chosen_drive].minor);
 662                 if (ioctl(mdfd, START_ARRAY, dev)) {
 663                     fprintf(stderr, Name ": Cannot start array: %s\n",
 664                             strerror(errno));
 665                 }
 666
 667         }
 668         return 0;
 669 }