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         char *avail;
 121         int nextspare = 0;
 122
 123         vers = md_get_version(mdfd);
 124         if (vers <= 0) {
 125                 fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
 126                 return 1;
 127         }
 128         if (vers < 9000) {
 129                 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
 130                         "    Upgrade your kernel or try --build\n");
 131                 return 1;
 132         }
 133         if (get_linux_version() < 2004000)
 134                 old_linux = 1;
 135
 136         if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
 137                 fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
 138                         mddev);
 139                 return 1;
 140         }
 141         ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
 142
 143         /*
 144          * If any subdevs are listed, then any that don't
 145          * match ident are discarded.  Remainder must all match and
 146          * become the array.
 147          * If no subdevs, then we scan all devices in the config file, but
 148          * there must be something in the identity
 149          */
 150
 151         if (!devlist &&
 152             ident->uuid_set == 0 &&
 153             ident->super_minor < 0 &&
 154             ident->devices == NULL) {
 155                 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
 156                         mddev);
 157                 return 1;
 158         }
 159         if (devlist == NULL)
 160                 devlist = conf_get_devs(conffile);
 161         else inargv = 1;
 162
 163         tmpdev = devlist; num_devs = 0;
 164         while (tmpdev) {
 165                 num_devs++;
 166                 tmpdev = tmpdev->next;
 167         }
 168         devices = malloc(num_devs * sizeof(*devices));
 169
 170         if (!st && ident->st) st = ident->st;
 171
 172         if (verbose>0)
 173             fprintf(stderr, Name ": looking for devices for %s\n",
 174                     mddev);
 175
 176         while ( devlist) {
 177                 char *devname;
 178                 int dfd;
 179                 struct stat stb;
 180                 struct supertype *tst = st;
 181
 182                 devname = devlist->devname;
 183                 devlist = devlist->next;
 184
 185                 if (ident->devices &&
 186                     !match_oneof(ident->devices, devname)) {
 187                         if ((inargv && verbose>=0) || verbose > 0)
 188                                 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
 189                         continue;
 190                 }
 191
 192                 if (super) {
 193                         free(super);
 194                         super = NULL;
 195                 }
 196
 197                 dfd = dev_open(devname, O_RDONLY|O_EXCL);
 198                 if (dfd < 0) {
 199                         if ((inargv && verbose >= 0) || verbose > 0)
 200                                 fprintf(stderr, Name ": cannot open device %s: %s\n",
 201                                         devname, strerror(errno));
 202                 } else if (fstat(dfd, &stb)< 0) {
 203                         /* Impossible! */
 204                         fprintf(stderr, Name ": fstat failed for %s: %s\n",
 205                                 devname, strerror(errno));
 206                 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 207                         fprintf(stderr, Name ": %s is not a block device.\n",
 208                                 devname);
 209                 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
 210                         if ((inargv && verbose >= 0) || verbose > 0)
 211                                 fprintf(stderr, Name ": no recogniseable superblock\n");
 212                 } else if (tst->ss->load_super(tst,dfd, &super, NULL)) {
 213                         if ((inargv && verbose >= 0) || verbose > 0)
 214                                 fprintf( stderr, Name ": no RAID superblock on %s\n",
 215                                          devname);
 216                 } else {
 217                         tst->ss->getinfo_super(&info, super);
 218                 }
 219                 if (dfd >= 0) close(dfd);
 220
 221                 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
 222                     (!super || same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
 223                         if ((inargv && verbose >= 0) || verbose > 0)
 224                                 fprintf(stderr, Name ": %s has wrong uuid.\n",
 225                                         devname);
 226                         continue;
 227                 }
 228                 if (ident->name[0] &&
 229                     (!super || strncmp(info.name, ident->name, 32)!=0)) {
 230                         if ((inargv && verbose >= 0) || verbose > 0)
 231                                 fprintf(stderr, Name ": %s has wrong name.\n",
 232                                         devname);
 233                         continue;
 234                 }
 235                 if (ident->super_minor != UnSet &&
 236                     (!super || ident->super_minor != info.array.md_minor)) {
 237                         if ((inargv && verbose >= 0) || verbose > 0)
 238                                 fprintf(stderr, Name ": %s has wrong super-minor.\n",
 239                                         devname);
 240                         continue;
 241                 }
 242                 if (ident->level != UnSet &&
 243                     (!super|| ident->level != info.array.level)) {
 244                         if ((inargv && verbose >= 0) || verbose > 0)
 245                                 fprintf(stderr, Name ": %s has wrong raid level.\n",
 246                                         devname);
 247                         continue;
 248                 }
 249                 if (ident->raid_disks != UnSet &&
 250                     (!super || ident->raid_disks!= info.array.raid_disks)) {
 251                         if ((inargv && verbose >= 0) || verbose > 0)
 252                                 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
 253                                         devname);
 254                         continue;
 255                 }
 256
 257                 /* If we are this far, then we are commited to this device.
 258                  * If the super_block doesn't exist, or doesn't match others,
 259                  * then we cannot continue
 260                  */
 261
 262                 if (!super) {
 263                         fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
 264                                 devname);
 265                         free(first_super);
 266                         return 1;
 267                 }
 268
 269
 270                 st = tst; /* commit to this format, if haven't already */
 271                 if (st->ss->compare_super(&first_super, super)) {
 272                         fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
 273                                 devname);
 274                         free(super);
 275                         free(first_super);
 276                         return 1;
 277                 }
 278
 279                 /* looks like a good enough match to update the super block if needed */
 280                 if (update) {
 281                         /* prepare useful information in info structures */
 282                         struct stat stb2;
 283                         fstat(mdfd, &stb2);
 284                         info.array.md_minor = minor(stb2.st_rdev);
 285
 286                         if (strcmp(update, "uuid")==0 &&
 287                             !ident->uuid_set) {
 288                                 int rfd;
 289                                 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
 290                                     read(rfd, ident->uuid, 16) != 16) {
 291                                         *(__u32*)(ident->uuid) = random();
 292                                         *(__u32*)(ident->uuid+1) = random();
 293                                         *(__u32*)(ident->uuid+2) = random();
 294                                         *(__u32*)(ident->uuid+3) = random();
 295                                 }
 296                                 if (rfd >= 0) close(rfd);
 297                                 ident->uuid_set = 1;
 298                         }
 299                         memcpy(info.uuid, ident->uuid, 16);
 300                         st->ss->update_super(&info, super, update, devname, verbose);
 301
 302                         dfd = dev_open(devname, O_RDWR|O_EXCL);
 303                         if (dfd < 0)
 304                                 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
 305                                         devname);
 306                         else if (st->ss->store_super(st, dfd, super))
 307                                 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
 308                                         devname);
 309                         if (dfd >= 0)
 310                                 close(dfd);
 311                 }
 312
 313                 if (verbose > 0)
 314                         fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
 315                                 devname, mddev, info.disk.raid_disk);
 316                 devices[devcnt].devname = devname;
 317                 devices[devcnt].major = major(stb.st_rdev);
 318                 devices[devcnt].minor = minor(stb.st_rdev);
 319                 devices[devcnt].oldmajor = info.disk.major;
 320                 devices[devcnt].oldminor = info.disk.minor;
 321                 devices[devcnt].events = info.events;
 322                 devices[devcnt].raid_disk = info.disk.raid_disk;
 323                 devices[devcnt].disk_nr = info.disk.number;
 324                 devices[devcnt].uptodate = 0;
 325                 devices[devcnt].state = info.disk.state;
 326                 if (most_recent < devcnt) {
 327                         if (devices[devcnt].events
 328                             > devices[most_recent].events)
 329                                 most_recent = devcnt;
 330                 }
 331                 if (info.array.level == -4)
 332                         /* with multipath, the raid_disk from the superblock is meaningless */
 333                         i = devcnt;
 334                 else
 335                         i = devices[devcnt].raid_disk;
 336                 if (i+1 == 0) {
 337                         if (nextspare < info.array.raid_disks)
 338                                 nextspare = info.array.raid_disks;
 339                         i = nextspare++;
 340                 }
 341                 if (i < 10000) {
 342                         if (i >= bestcnt) {
 343                                 unsigned int newbestcnt = i+10;
 344                                 int *newbest = malloc(sizeof(int)*newbestcnt);
 345                                 unsigned int c;
 346                                 for (c=0; c < newbestcnt; c++)
 347                                         if (c < bestcnt)
 348                                                 newbest[c] = best[c];
 349                                         else
 350                                                 newbest[c] = -1;
 351                                 if (best)free(best);
 352                                 best = newbest;
 353                                 bestcnt = newbestcnt;
 354                         }
 355                         if (best[i] == -1
 356                             || devices[best[i]].events < devices[devcnt].events)
 357                                 best[i] = devcnt;
 358                 }
 359                 devcnt++;
 360         }
 361
 362         if (super)
 363                 free(super);
 364         super = NULL;
 365
 366         if (update && strcmp(update, "byteorder")==0)
 367                 st->minor_version = 90;
 368
 369         if (devcnt == 0) {
 370                 fprintf(stderr, Name ": no devices found for %s\n",
 371                         mddev);
 372                 free(first_super);
 373                 return 1;
 374         }
 375
 376         st->ss->getinfo_super(&info, first_super);
 377
 378         /* now we have some devices that might be suitable.
 379          * I wonder how many
 380          */
 381         avail = malloc(info.array.raid_disks);
 382         memset(avail, 0, info.array.raid_disks);
 383         okcnt = 0;
 384         sparecnt=0;
 385         for (i=0; i< bestcnt ;i++) {
 386                 int j = best[i];
 387                 int event_margin = 1; /* always allow a difference of '1'
 388                                        * like the kernel does
 389                                        */
 390                 if (j < 0) continue;
 391                 /* note: we ignore error flags in multipath arrays
 392                  * as they don't make sense
 393                  */
 394                 if (info.array.level != -4)
 395                         if (!(devices[j].state & (1<<MD_DISK_SYNC))) {
 396                                 if (!(devices[j].state & (1<<MD_DISK_FAULTY)))
 397                                         sparecnt++;
 398                                 continue;
 399                         }
 400                 if (devices[j].events+event_margin >=
 401                     devices[most_recent].events) {
 402                         devices[j].uptodate = 1;
 403                         if (i < info.array.raid_disks) {
 404                                 okcnt++;
 405                                 avail[i]=1;
 406                         } else
 407                                 sparecnt++;
 408                 }
 409         }
 410         while (force && !enough(info.array.level, info.array.raid_disks,
 411                                 info.array.layout,
 412                                 avail, okcnt)) {
 413                 /* Choose the newest best drive which is
 414                  * not up-to-date, update the superblock
 415                  * and add it.
 416                  */
 417                 int fd;
 418                 chosen_drive = -1;
 419                 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
 420                         int j = best[i];
 421                         if (j>=0 &&
 422                             !devices[j].uptodate &&
 423                             devices[j].events > 0 &&
 424                             (chosen_drive < 0 ||
 425                              devices[j].events > devices[chosen_drive].events))
 426                                 chosen_drive = j;
 427                 }
 428                 if (chosen_drive < 0)
 429                         break;
 430                 if (verbose >= 0)
 431                         fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
 432                                 devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
 433                                 (int)(devices[chosen_drive].events),
 434                                 (int)(devices[most_recent].events));
 435                 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 436                 if (fd < 0) {
 437                         fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
 438                                 devices[chosen_drive].devname);
 439                         devices[chosen_drive].events = 0;
 440                         continue;
 441                 }
 442                 if (st->ss->load_super(st,fd, &super, NULL)) {
 443                         close(fd);
 444                         fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
 445                                 devices[chosen_drive].devname);
 446                         devices[chosen_drive].events = 0;
 447                         continue;
 448                 }
 449                 info.events = devices[most_recent].events;
 450                 st->ss->update_super(&info, super, "force", devices[chosen_drive].devname, verbose);
 451
 452                 if (st->ss->store_super(st, fd, super)) {
 453                         close(fd);
 454                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 455                                 devices[chosen_drive].devname);
 456                         devices[chosen_drive].events = 0;
 457                         free(super);
 458                         continue;
 459                 }
 460                 close(fd);
 461                 devices[chosen_drive].events = devices[most_recent].events;
 462                 devices[chosen_drive].uptodate = 1;
 463                 avail[chosen_drive] = 1;
 464                 okcnt++;
 465                 free(super);
 466         }
 467
 468         /* Now we want to look at the superblock which the kernel will base things on
 469          * and compare the devices that we think are working with the devices that the
 470          * superblock thinks are working.
 471          * If there are differences and --force is given, then update this chosen
 472          * superblock.
 473          */
 474         chosen_drive = -1;
 475         super = NULL;
 476         for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
 477                 int j = best[i];
 478                 int fd;
 479
 480                 if (j<0)
 481                         continue;
 482                 if (!devices[j].uptodate)
 483                         continue;
 484                 chosen_drive = j;
 485                 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
 486                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 487                                 devices[j].devname, strerror(errno));
 488                         return 1;
 489                 }
 490                 if (st->ss->load_super(st,fd, &super, NULL)) {
 491                         close(fd);
 492                         fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
 493                                 devices[j].devname);
 494                         return 1;
 495                 }
 496                 close(fd);
 497         }
 498         if (super == NULL) {
 499                 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
 500                 return 1;
 501         }
 502         st->ss->getinfo_super(&info, super);
 503         for (i=0; i<bestcnt; i++) {
 504                 int j = best[i];
 505                 unsigned int desired_state;
 506
 507                 if (i < info.array.raid_disks)
 508                         desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
 509                 else
 510                         desired_state = 0;
 511
 512                 if (j<0)
 513                         continue;
 514                 if (!devices[j].uptodate)
 515                         continue;
 516                 info.disk.number = devices[j].disk_nr;
 517                 info.disk.raid_disk = i;
 518                 info.disk.state = desired_state;
 519
 520                 if (devices[j].uptodate &&
 521                     st->ss->update_super(&info, super, "assemble", NULL, verbose)) {
 522                         if (force) {
 523                                 if (verbose >= 0)
 524                                         fprintf(stderr, Name ": "
 525                                                 "clearing FAULTY flag for device %d in %s for %s\n",
 526                                                 j, mddev, devices[j].devname);
 527                                 change = 1;
 528                         } else {
 529                                 if (verbose >= -1)
 530                                         fprintf(stderr, Name ": "
 531                                                 "device %d in %s has wrong state in superblock, but %s seems ok\n",
 532                                                 i, mddev, devices[j].devname);
 533                         }
 534                 }
 535 #if 0
 536                 if (!devices[j].uptodate &&
 537                     !(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
 538                         fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
 539                                 i, mddev);
 540                 }
 541 #endif
 542         }
 543         if (force && okcnt == info.array.raid_disks-1) {
 544                 /* FIXME check event count */
 545                 change += st->ss->update_super(&info, super, "force",
 546                                         devices[chosen_drive].devname, verbose);
 547         }
 548
 549         if (change) {
 550                 int fd;
 551                 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 552                 if (fd < 0) {
 553                         fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
 554                                 devices[chosen_drive].devname);
 555                         return 1;
 556                 }
 557                 if (st->ss->store_super(st, fd, super)) {
 558                         close(fd);
 559                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 560                                 devices[chosen_drive].devname);
 561                         return 1;
 562                 }
 563                 close(fd);
 564         }
 565
 566         /* If we are in the middle of a reshape we may need to restore saved data
 567          * that was moved aside due to the reshape overwriting live data
 568          * The code of doing this lives in Grow.c
 569          */
 570 #ifndef MDASSEMBLE
 571         if (info.reshape_active) {
 572                 int err = 0;
 573                 int *fdlist = malloc(sizeof(int)* bestcnt);
 574                 for (i=0; i<bestcnt; i++) {
 575                         int j = best[i];
 576                         if (j >= 0) {
 577                                 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
 578                                 if (fdlist[i] < 0) {
 579                                         fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
 580                                                 devices[j].devname);
 581                                         err = 1;
 582                                         break;
 583                                 }
 584                         } else
 585                                 fdlist[i] = -1;
 586                 }
 587                 if (!err)
 588                         err = Grow_restart(st, &info, fdlist, bestcnt);
 589                 while (i>0) {
 590                         i--;
 591                         if (fdlist[i]>=0) close(fdlist[i]);
 592                 }
 593                 if (err) {
 594                         fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
 595                         return err;
 596                 }
 597         }
 598 #endif
 599         /* count number of in-sync devices according to the superblock.
 600          * We must have this number to start the array without -s or -R
 601          */
 602         req_cnt = info.array.working_disks;
 603
 604         /* Almost ready to actually *do* something */
 605         if (!old_linux) {
 606                 int rv;
 607                 if ((vers % 100) >= 1) { /* can use different versions */
 608                         mdu_array_info_t inf;
 609                         memset(&inf, 0, sizeof(inf));
 610                         inf.major_version = st->ss->major;
 611                         inf.minor_version = st->minor_version;
 612                         rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
 613                 } else
 614                         rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
 615
 616                 if (rv) {
 617                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 618                                 mddev, strerror(errno));
 619                         return 1;
 620                 }
 621                 if (ident->bitmap_fd >= 0) {
 622                         if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
 623                                 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
 624                                 return 1;
 625                         }
 626                 }
 627
 628                 /* First, add the raid disks, but add the chosen one last */
 629                 for (i=0; i<= bestcnt; i++) {
 630                         int j;
 631                         if (i < bestcnt) {
 632                                 j = best[i];
 633                                 if (j == chosen_drive)
 634                                         continue;
 635                         } else
 636                                 j = chosen_drive;
 637
 638                         if (j >= 0 /* && devices[j].uptodate */) {
 639                                 mdu_disk_info_t disk;
 640                                 memset(&disk, 0, sizeof(disk));
 641                                 disk.major = devices[j].major;
 642                                 disk.minor = devices[j].minor;
 643                                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
 644                                         fprintf(stderr, Name ": failed to add %s to %s: %s\n",
 645                                                 devices[j].devname,
 646                                                 mddev,
 647                                                 strerror(errno));
 648                                         if (i < info.array.raid_disks || i == bestcnt)
 649                                                 okcnt--;
 650                                         else
 651                                                 sparecnt--;
 652                                 } else if (verbose > 0)
 653                                         fprintf(stderr, Name ": added %s to %s as %d\n",
 654                                                 devices[j].devname, mddev, devices[j].raid_disk);
 655                         } else if (verbose > 0 && i < info.array.raid_disks)
 656                                 fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
 657                                         i, mddev);
 658                 }
 659
 660                 if (runstop == 1 ||
 661                     (runstop == 0 &&
 662                      ( enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt) &&
 663                        (okcnt >= req_cnt || start_partial_ok)
 664                              ))) {
 665                         if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
 666                                 if (verbose >= 0) {
 667                                         fprintf(stderr, Name ": %s has been started with %d drive%s",
 668                                                 mddev, okcnt, okcnt==1?"":"s");
 669                                         if (okcnt < info.array.raid_disks)
 670                                                 fprintf(stderr, " (out of %d)", info.array.raid_disks);
 671                                         if (sparecnt)
 672                                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 673                                         fprintf(stderr, ".\n");
 674                                 }
 675                                 return 0;
 676                         }
 677                         fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
 678                                 mddev, strerror(errno));
 679                         return 1;
 680                 }
 681                 if (runstop == -1) {
 682                         fprintf(stderr, Name ": %s assembled from %d drive%s, but not started.\n",
 683                                 mddev, okcnt, okcnt==1?"":"s");
 684                         return 0;
 685                 }
 686                 if (verbose >= 0) {
 687                         fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
 688                         if (sparecnt)
 689                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 690                         if (!enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt))
 691                                 fprintf(stderr, " - not enough to start the array.\n");
 692                         else {
 693                                 if (req_cnt == info.array.raid_disks)
 694                                         fprintf(stderr, " - need all %d to start it", req_cnt);
 695                                 else
 696                                         fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
 697                                 fprintf(stderr, " (use --run to insist).\n");
 698                         }
 699                 }
 700                 return 1;
 701         } else {
 702                 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
 703                  * been updated to point to the current locations of devices.
 704                  * so we can just start the array
 705                  */
 706                 unsigned long dev;
 707                 dev = makedev(devices[chosen_drive].major,
 708                             devices[chosen_drive].minor);
 709                 if (ioctl(mdfd, START_ARRAY, dev)) {
 710                     fprintf(stderr, Name ": Cannot start array: %s\n",
 711                             strerror(errno));
 712                 }
 713
 714         }
 715         return 0;
 716 }