Assemble.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 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@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 static int name_matches(char *found, char *required, char *homehost)
  33 {
  34         /* See if the name found matches the required name, possibly
  35          * prefixed with 'homehost'
  36          */
  37         char fnd[33];
  38
  39         strncpy(fnd, found, 32);
  40         fnd[32] = 0;
  41         if (strcmp(found, required)==0)
  42                 return 1;
  43         if (homehost) {
  44                 int l = strlen(homehost);
  45                 if (l < 32 && fnd[l] == ':' &&
  46                     strcmp(fnd+l+1, required)==0)
  47                         return 1;
  48         }
  49         return 0;
  50 }
  51
  52 int Assemble(struct supertype *st, char *mddev, int mdfd,
  53              mddev_ident_t ident, char *conffile,
  54              mddev_dev_t devlist, char *backup_file,
  55              int readonly, int runstop,
  56              char *update, char *homehost,
  57              int verbose, int force)
  58 {
  59         /*
  60          * The task of Assemble is to find a collection of
  61          * devices that should (according to their superblocks)
  62          * form an array, and to give this collection to the MD driver.
  63          * In Linux-2.4 and later, this involves submitting a
  64          * SET_ARRAY_INFO ioctl with no arg - to prepare
  65          * the array - and then submit a number of
  66          * ADD_NEW_DISK ioctls to add disks into
  67          * the array.  Finally RUN_ARRAY might
  68          * be submitted to start the array.
  69          *
  70          * Much of the work of Assemble is in finding and/or
  71          * checking the disks to make sure they look right.
  72          *
  73          * If mddev is not set, then scan must be set and we
  74          *  read through the config file for dev+uuid mapping
  75          *  We recurse, setting mddev, for each device that
  76          *    - isn't running
  77          *    - has a valid uuid (or any uuid if !uuidset)
  78          *
  79          * If mddev is set, we try to determine state of md.
  80          *   check version - must be at least 0.90.0
  81          *   check kernel version.  must be at least 2.4.
  82          *    If not, we can possibly fall back on START_ARRAY
  83          *   Try to GET_ARRAY_INFO.
  84          *     If possible, give up
  85          *     If not, try to STOP_ARRAY just to make sure
  86          *
  87          * If !uuidset and scan, look in conf-file for uuid
  88          *       If not found, give up
  89          * If !devlist and scan and uuidset, get list of devs from conf-file
  90          *
  91          * For each device:
  92          *   Check superblock - discard if bad
  93          *   Check uuid (set if we don't have one) - discard if no match
  94          *   Check superblock similarity if we have a superblock - discard if different
  95          *   Record events, devicenum
  96          * This should give us a list of devices for the array
  97          * We should collect the most recent event number
  98          *
  99          * Count disks with recent enough event count
 100          * While force && !enough disks
 101          *    Choose newest rejected disks, update event count
 102          *     mark clean and rewrite superblock
 103          * If recent kernel:
 104          *    SET_ARRAY_INFO
 105          *    foreach device with recent events : ADD_NEW_DISK
 106          *    if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
 107          * If old kernel:
 108          *    Check the device numbers in superblock are right
 109          *    update superblock if any changes
 110          *    START_ARRAY
 111          *
 112          */
 113         int old_linux = 0;
 114         int vers;
 115         void *first_super = NULL, *super = NULL;
 116         struct {
 117                 char *devname;
 118                 unsigned int major, minor;
 119                 unsigned int oldmajor, oldminor;
 120                 long long events;
 121                 int uptodate;
 122                 int state;
 123                 int raid_disk;
 124                 int disk_nr;
 125         } *devices;
 126         int *best = NULL; /* indexed by raid_disk */
 127         unsigned int bestcnt = 0;
 128         int devcnt = 0;
 129         unsigned int okcnt, sparecnt;
 130         unsigned int req_cnt;
 131         unsigned int i;
 132         int most_recent = 0;
 133         int chosen_drive;
 134         int change = 0;
 135         int inargv = 0;
 136         int start_partial_ok = (runstop >= 0) && (force || devlist==NULL);
 137         unsigned int num_devs;
 138         mddev_dev_t tmpdev;
 139         struct mdinfo info;
 140         char *avail;
 141         int nextspare = 0;
 142
 143         vers = md_get_version(mdfd);
 144         if (vers <= 0) {
 145                 fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
 146                 return 1;
 147         }
 148         if (vers < 9000) {
 149                 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
 150                         "    Upgrade your kernel or try --build\n");
 151                 return 1;
 152         }
 153         if (get_linux_version() < 2004000)
 154                 old_linux = 1;
 155
 156         if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
 157                 fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
 158                         mddev);
 159                 return 1;
 160         }
 161         ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
 162
 163         /*
 164          * If any subdevs are listed, then any that don't
 165          * match ident are discarded.  Remainder must all match and
 166          * become the array.
 167          * If no subdevs, then we scan all devices in the config file, but
 168          * there must be something in the identity
 169          */
 170
 171         if (!devlist &&
 172             ident->uuid_set == 0 &&
 173             ident->super_minor < 0 &&
 174             ident->devices == NULL) {
 175                 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
 176                         mddev);
 177                 return 1;
 178         }
 179         if (devlist == NULL)
 180                 devlist = conf_get_devs(conffile);
 181         else inargv = 1;
 182
 183         tmpdev = devlist; num_devs = 0;
 184         while (tmpdev) {
 185                 num_devs++;
 186                 tmpdev = tmpdev->next;
 187         }
 188         devices = malloc(num_devs * sizeof(*devices));
 189
 190         if (!st && ident->st) st = ident->st;
 191
 192         if (verbose>0)
 193             fprintf(stderr, Name ": looking for devices for %s\n",
 194                     mddev);
 195
 196         /* first walk the list of devices to find a consistent set
 197          * that match the criterea, if that is possible.
 198          * We flag the one we like with 'used'.
 199          */
 200         for (tmpdev = devlist;
 201              tmpdev;
 202              tmpdev = tmpdev->next) {
 203                 char *devname = tmpdev->devname;
 204                 int dfd;
 205                 struct stat stb;
 206                 struct supertype *tst = st;
 207
 208                 if (ident->devices &&
 209                     !match_oneof(ident->devices, devname)) {
 210                         if ((inargv && verbose>=0) || verbose > 0)
 211                                 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
 212                         continue;
 213                 }
 214
 215                 if (super) {
 216                         free(super);
 217                         super = NULL;
 218                 }
 219
 220                 dfd = dev_open(devname, O_RDONLY|O_EXCL);
 221                 if (dfd < 0) {
 222                         if ((inargv && verbose >= 0) || verbose > 0)
 223                                 fprintf(stderr, Name ": cannot open device %s: %s\n",
 224                                         devname, strerror(errno));
 225                 } else if (fstat(dfd, &stb)< 0) {
 226                         /* Impossible! */
 227                         fprintf(stderr, Name ": fstat failed for %s: %s\n",
 228                                 devname, strerror(errno));
 229                 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 230                         fprintf(stderr, Name ": %s is not a block device.\n",
 231                                 devname);
 232                 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
 233                         if ((inargv && verbose >= 0) || verbose > 0)
 234                                 fprintf(stderr, Name ": no recogniseable superblock\n");
 235                 } else if (tst->ss->load_super(tst,dfd, &super, NULL)) {
 236                         if ((inargv && verbose >= 0) || verbose > 0)
 237                                 fprintf( stderr, Name ": no RAID superblock on %s\n",
 238                                          devname);
 239                 } else {
 240                         tst->ss->getinfo_super(&info, super);
 241                 }
 242                 if (dfd >= 0) close(dfd);
 243
 244                 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
 245                     (!super || same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
 246                         if ((inargv && verbose >= 0) || verbose > 0)
 247                                 fprintf(stderr, Name ": %s has wrong uuid.\n",
 248                                         devname);
 249                         continue;
 250                 }
 251                 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
 252                     (!super || name_matches(info.name, ident->name, homehost)==0)) {
 253                         if ((inargv && verbose >= 0) || verbose > 0)
 254                                 fprintf(stderr, Name ": %s has wrong name.\n",
 255                                         devname);
 256                         continue;
 257                 }
 258                 if (ident->super_minor != UnSet &&
 259                     (!super || ident->super_minor != info.array.md_minor)) {
 260                         if ((inargv && verbose >= 0) || verbose > 0)
 261                                 fprintf(stderr, Name ": %s has wrong super-minor.\n",
 262                                         devname);
 263                         continue;
 264                 }
 265                 if (ident->level != UnSet &&
 266                     (!super|| ident->level != info.array.level)) {
 267                         if ((inargv && verbose >= 0) || verbose > 0)
 268                                 fprintf(stderr, Name ": %s has wrong raid level.\n",
 269                                         devname);
 270                         continue;
 271                 }
 272                 if (ident->raid_disks != UnSet &&
 273                     (!super || ident->raid_disks!= info.array.raid_disks)) {
 274                         if ((inargv && verbose >= 0) || verbose > 0)
 275                                 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
 276                                         devname);
 277                         continue;
 278                 }
 279
 280                 /* If we are this far, then we are commited to this device.
 281                  * If the super_block doesn't exist, or doesn't match others,
 282                  * then we cannot continue
 283                  */
 284
 285                 if (!super) {
 286                         fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
 287                                 devname);
 288                         free(first_super);
 289                         return 1;
 290                 }
 291
 292
 293                 st = tst; /* commit to this format, if haven't already */
 294                 if (st->ss->compare_super(&first_super, super)) {
 295                         fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
 296                                 devname);
 297                         free(super);
 298                         free(first_super);
 299                         return 1;
 300                 }
 301
 302                 tmpdev->used = 1;
 303         }
 304
 305         /* Ok, no bad inconsistancy, we can try updating etc */
 306         for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used) {
 307                 char *devname = tmpdev->devname;
 308                 struct stat stb;
 309                 /* looks like a good enough match to update the super block if needed */
 310                 if (update) {
 311                         int dfd;
 312                         /* prepare useful information in info structures */
 313                         struct stat stb2;
 314                         fstat(mdfd, &stb2);
 315
 316                         if (strcmp(update, "uuid")==0 &&
 317                             !ident->uuid_set) {
 318                                 int rfd;
 319                                 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
 320                                     read(rfd, ident->uuid, 16) != 16) {
 321                                         *(__u32*)(ident->uuid) = random();
 322                                         *(__u32*)(ident->uuid+1) = random();
 323                                         *(__u32*)(ident->uuid+2) = random();
 324                                         *(__u32*)(ident->uuid+3) = random();
 325                                 }
 326                                 if (rfd >= 0) close(rfd);
 327                         }
 328                         dfd = dev_open(devname, O_RDWR|O_EXCL);
 329
 330                         if (super) {
 331                                 free(super);
 332                                 super = NULL;
 333                         }
 334
 335                         st->ss->load_super(st, dfd, &super, NULL);
 336                         st->ss->getinfo_super(&info, super);
 337
 338                         memcpy(info.uuid, ident->uuid, 16);
 339                         strcpy(info.name, ident->name);
 340                         info.array.md_minor = minor(stb2.st_rdev);
 341
 342                         st->ss->update_super(&info, super, update, devname, verbose,
 343                                              ident->uuid_set, homehost);
 344                         if (strcmp(update, "uuid")==0 &&
 345                             !ident->uuid_set) {
 346                                 ident->uuid_set = 1;
 347                                 memcpy(ident->uuid, info.uuid, 16);
 348                         }
 349                         if (dfd < 0)
 350                                 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
 351                                         devname);
 352                         else if (st->ss->store_super(st, dfd, super))
 353                                 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
 354                                         devname);
 355                         if (dfd >= 0)
 356                                 close(dfd);
 357
 358                         if (strcmp(update, "uuid")==0 &&
 359                             ident->bitmap_fd)
 360                                 bitmap_update_uuid(ident->bitmap_fd, info.uuid);
 361                 }
 362
 363                 stat(devname, &stb);
 364
 365                 if (verbose > 0)
 366                         fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
 367                                 devname, mddev, info.disk.raid_disk);
 368                 devices[devcnt].devname = devname;
 369                 devices[devcnt].major = major(stb.st_rdev);
 370                 devices[devcnt].minor = minor(stb.st_rdev);
 371                 devices[devcnt].oldmajor = info.disk.major;
 372                 devices[devcnt].oldminor = info.disk.minor;
 373                 devices[devcnt].events = info.events;
 374                 devices[devcnt].raid_disk = info.disk.raid_disk;
 375                 devices[devcnt].disk_nr = info.disk.number;
 376                 devices[devcnt].uptodate = 0;
 377                 devices[devcnt].state = info.disk.state;
 378                 if (most_recent < devcnt) {
 379                         if (devices[devcnt].events
 380                             > devices[most_recent].events)
 381                                 most_recent = devcnt;
 382                 }
 383                 if (info.array.level == -4)
 384                         /* with multipath, the raid_disk from the superblock is meaningless */
 385                         i = devcnt;
 386                 else
 387                         i = devices[devcnt].raid_disk;
 388                 if (i+1 == 0) {
 389                         if (nextspare < info.array.raid_disks)
 390                                 nextspare = info.array.raid_disks;
 391                         i = nextspare++;
 392                 }
 393                 if (i < 10000) {
 394                         if (i >= bestcnt) {
 395                                 unsigned int newbestcnt = i+10;
 396                                 int *newbest = malloc(sizeof(int)*newbestcnt);
 397                                 unsigned int c;
 398                                 for (c=0; c < newbestcnt; c++)
 399                                         if (c < bestcnt)
 400                                                 newbest[c] = best[c];
 401                                         else
 402                                                 newbest[c] = -1;
 403                                 if (best)free(best);
 404                                 best = newbest;
 405                                 bestcnt = newbestcnt;
 406                         }
 407                         if (best[i] == -1
 408                             || devices[best[i]].events < devices[devcnt].events)
 409                                 best[i] = devcnt;
 410                 }
 411                 devcnt++;
 412         }
 413
 414         if (super)
 415                 free(super);
 416         super = NULL;
 417
 418         if (update && strcmp(update, "byteorder")==0)
 419                 st->minor_version = 90;
 420
 421         if (devcnt == 0) {
 422                 fprintf(stderr, Name ": no devices found for %s\n",
 423                         mddev);
 424                 free(first_super);
 425                 return 1;
 426         }
 427
 428         st->ss->getinfo_super(&info, first_super);
 429
 430         /* now we have some devices that might be suitable.
 431          * I wonder how many
 432          */
 433         avail = malloc(info.array.raid_disks);
 434         memset(avail, 0, info.array.raid_disks);
 435         okcnt = 0;
 436         sparecnt=0;
 437         for (i=0; i< bestcnt ;i++) {
 438                 int j = best[i];
 439                 int event_margin = 1; /* always allow a difference of '1'
 440                                        * like the kernel does
 441                                        */
 442                 if (j < 0) continue;
 443                 /* note: we ignore error flags in multipath arrays
 444                  * as they don't make sense
 445                  */
 446                 if (info.array.level != -4)
 447                         if (!(devices[j].state & (1<<MD_DISK_SYNC))) {
 448                                 if (!(devices[j].state & (1<<MD_DISK_FAULTY)))
 449                                         sparecnt++;
 450                                 continue;
 451                         }
 452                 if (devices[j].events+event_margin >=
 453                     devices[most_recent].events) {
 454                         devices[j].uptodate = 1;
 455                         if (i < info.array.raid_disks) {
 456                                 okcnt++;
 457                                 avail[i]=1;
 458                         } else
 459                                 sparecnt++;
 460                 }
 461         }
 462         while (force && !enough(info.array.level, info.array.raid_disks,
 463                                 info.array.layout,
 464                                 avail, okcnt)) {
 465                 /* Choose the newest best drive which is
 466                  * not up-to-date, update the superblock
 467                  * and add it.
 468                  */
 469                 int fd;
 470                 chosen_drive = -1;
 471                 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
 472                         int j = best[i];
 473                         if (j>=0 &&
 474                             !devices[j].uptodate &&
 475                             devices[j].events > 0 &&
 476                             (chosen_drive < 0 ||
 477                              devices[j].events > devices[chosen_drive].events))
 478                                 chosen_drive = j;
 479                 }
 480                 if (chosen_drive < 0)
 481                         break;
 482                 if (verbose >= 0)
 483                         fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
 484                                 devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
 485                                 (int)(devices[chosen_drive].events),
 486                                 (int)(devices[most_recent].events));
 487                 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 488                 if (fd < 0) {
 489                         fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
 490                                 devices[chosen_drive].devname);
 491                         devices[chosen_drive].events = 0;
 492                         continue;
 493                 }
 494                 if (st->ss->load_super(st,fd, &super, NULL)) {
 495                         close(fd);
 496                         fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
 497                                 devices[chosen_drive].devname);
 498                         devices[chosen_drive].events = 0;
 499                         continue;
 500                 }
 501                 info.events = devices[most_recent].events;
 502                 st->ss->update_super(&info, super, "force", devices[chosen_drive].devname, verbose, 0, NULL);
 503
 504                 if (st->ss->store_super(st, fd, super)) {
 505                         close(fd);
 506                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 507                                 devices[chosen_drive].devname);
 508                         devices[chosen_drive].events = 0;
 509                         free(super);
 510                         continue;
 511                 }
 512                 close(fd);
 513                 devices[chosen_drive].events = devices[most_recent].events;
 514                 devices[chosen_drive].uptodate = 1;
 515                 avail[chosen_drive] = 1;
 516                 okcnt++;
 517                 free(super);
 518         }
 519
 520         /* Now we want to look at the superblock which the kernel will base things on
 521          * and compare the devices that we think are working with the devices that the
 522          * superblock thinks are working.
 523          * If there are differences and --force is given, then update this chosen
 524          * superblock.
 525          */
 526         chosen_drive = -1;
 527         super = NULL;
 528         for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
 529                 int j = best[i];
 530                 int fd;
 531
 532                 if (j<0)
 533                         continue;
 534                 if (!devices[j].uptodate)
 535                         continue;
 536                 chosen_drive = j;
 537                 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
 538                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 539                                 devices[j].devname, strerror(errno));
 540                         return 1;
 541                 }
 542                 if (st->ss->load_super(st,fd, &super, NULL)) {
 543                         close(fd);
 544                         fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
 545                                 devices[j].devname);
 546                         return 1;
 547                 }
 548                 close(fd);
 549         }
 550         if (super == NULL) {
 551                 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
 552                 return 1;
 553         }
 554         st->ss->getinfo_super(&info, super);
 555         for (i=0; i<bestcnt; i++) {
 556                 int j = best[i];
 557                 unsigned int desired_state;
 558
 559                 if (i < info.array.raid_disks)
 560                         desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
 561                 else
 562                         desired_state = 0;
 563
 564                 if (j<0)
 565                         continue;
 566                 if (!devices[j].uptodate)
 567                         continue;
 568                 info.disk.number = devices[j].disk_nr;
 569                 info.disk.raid_disk = i;
 570                 info.disk.state = desired_state;
 571
 572                 if (devices[j].uptodate &&
 573                     st->ss->update_super(&info, super, "assemble", NULL, verbose, 0, NULL)) {
 574                         if (force) {
 575                                 if (verbose >= 0)
 576                                         fprintf(stderr, Name ": "
 577                                                 "clearing FAULTY flag for device %d in %s for %s\n",
 578                                                 j, mddev, devices[j].devname);
 579                                 change = 1;
 580                         } else {
 581                                 if (verbose >= -1)
 582                                         fprintf(stderr, Name ": "
 583                                                 "device %d in %s has wrong state in superblock, but %s seems ok\n",
 584                                                 i, mddev, devices[j].devname);
 585                         }
 586                 }
 587 #if 0
 588                 if (!devices[j].uptodate &&
 589                     !(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
 590                         fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
 591                                 i, mddev);
 592                 }
 593 #endif
 594         }
 595         if (force && okcnt == info.array.raid_disks-1) {
 596                 /* FIXME check event count */
 597                 change += st->ss->update_super(&info, super, "force",
 598                                         devices[chosen_drive].devname, verbose, 0, NULL);
 599         }
 600
 601         if (change) {
 602                 int fd;
 603                 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 604                 if (fd < 0) {
 605                         fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
 606                                 devices[chosen_drive].devname);
 607                         return 1;
 608                 }
 609                 if (st->ss->store_super(st, fd, super)) {
 610                         close(fd);
 611                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 612                                 devices[chosen_drive].devname);
 613                         return 1;
 614                 }
 615                 close(fd);
 616         }
 617
 618         /* If we are in the middle of a reshape we may need to restore saved data
 619          * that was moved aside due to the reshape overwriting live data
 620          * The code of doing this lives in Grow.c
 621          */
 622 #ifndef MDASSEMBLE
 623         if (info.reshape_active) {
 624                 int err = 0;
 625                 int *fdlist = malloc(sizeof(int)* bestcnt);
 626                 for (i=0; i<bestcnt; i++) {
 627                         int j = best[i];
 628                         if (j >= 0) {
 629                                 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
 630                                 if (fdlist[i] < 0) {
 631                                         fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
 632                                                 devices[j].devname);
 633                                         err = 1;
 634                                         break;
 635                                 }
 636                         } else
 637                                 fdlist[i] = -1;
 638                 }
 639                 if (!err)
 640                         err = Grow_restart(st, &info, fdlist, bestcnt, backup_file);
 641                 while (i>0) {
 642                         i--;
 643                         if (fdlist[i]>=0) close(fdlist[i]);
 644                 }
 645                 if (err) {
 646                         fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
 647                         return err;
 648                 }
 649         }
 650 #endif
 651         /* count number of in-sync devices according to the superblock.
 652          * We must have this number to start the array without -s or -R
 653          */
 654         req_cnt = info.array.working_disks;
 655
 656         /* Almost ready to actually *do* something */
 657         if (!old_linux) {
 658                 int rv;
 659                 if ((vers % 100) >= 1) { /* can use different versions */
 660                         mdu_array_info_t inf;
 661                         memset(&inf, 0, sizeof(inf));
 662                         inf.major_version = st->ss->major;
 663                         inf.minor_version = st->minor_version;
 664                         rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
 665                 } else
 666                         rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
 667
 668                 if (rv) {
 669                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 670                                 mddev, strerror(errno));
 671                         return 1;
 672                 }
 673                 if (ident->bitmap_fd >= 0) {
 674                         if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
 675                                 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
 676                                 return 1;
 677                         }
 678                 } else if (ident->bitmap_file) {
 679                         /* From config file */
 680                         int bmfd = open(ident->bitmap_file, O_RDWR);
 681                         if (bmfd < 0) {
 682                                 fprintf(stderr, Name ": Could not open bitmap file %s\n",
 683                                         ident->bitmap_file);
 684                                 return 1;
 685                         }
 686                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 687                                 fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
 688                                 close(bmfd);
 689                                 return 1;
 690                         }
 691                         close(bmfd);
 692                 }
 693
 694                 /* First, add the raid disks, but add the chosen one last */
 695                 for (i=0; i<= bestcnt; i++) {
 696                         int j;
 697                         if (i < bestcnt) {
 698                                 j = best[i];
 699                                 if (j == chosen_drive)
 700                                         continue;
 701                         } else
 702                                 j = chosen_drive;
 703
 704                         if (j >= 0 /* && devices[j].uptodate */) {
 705                                 mdu_disk_info_t disk;
 706                                 memset(&disk, 0, sizeof(disk));
 707                                 disk.major = devices[j].major;
 708                                 disk.minor = devices[j].minor;
 709                                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
 710                                         fprintf(stderr, Name ": failed to add %s to %s: %s\n",
 711                                                 devices[j].devname,
 712                                                 mddev,
 713                                                 strerror(errno));
 714                                         if (i < info.array.raid_disks || i == bestcnt)
 715                                                 okcnt--;
 716                                         else
 717                                                 sparecnt--;
 718                                 } else if (verbose > 0)
 719                                         fprintf(stderr, Name ": added %s to %s as %d\n",
 720                                                 devices[j].devname, mddev, devices[j].raid_disk);
 721                         } else if (verbose > 0 && i < info.array.raid_disks)
 722                                 fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
 723                                         i, mddev);
 724                 }
 725
 726                 if (runstop == 1 ||
 727                     (runstop <= 0 &&
 728                      ( enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt) &&
 729                        (okcnt >= req_cnt || start_partial_ok)
 730                              ))) {
 731                         if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
 732                                 if (verbose >= 0) {
 733                                         fprintf(stderr, Name ": %s has been started with %d drive%s",
 734                                                 mddev, okcnt, okcnt==1?"":"s");
 735                                         if (okcnt < info.array.raid_disks)
 736                                                 fprintf(stderr, " (out of %d)", info.array.raid_disks);
 737                                         if (sparecnt)
 738                                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 739                                         fprintf(stderr, ".\n");
 740                                 }
 741                                 return 0;
 742                         }
 743                         fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
 744                                 mddev, strerror(errno));
 745                         return 1;
 746                 }
 747                 if (runstop == -1) {
 748                         fprintf(stderr, Name ": %s assembled from %d drive%s",
 749                                 mddev, okcnt, okcnt==1?"":"s");
 750                         if (okcnt != info.array.raid_disks)
 751                                 fprintf(stderr, " (out of %d)", info.array.raid_disks);
 752                         fprintf(stderr, ", but not started.\n");
 753                         return 0;
 754                 }
 755                 if (verbose >= 0) {
 756                         fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
 757                         if (sparecnt)
 758                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 759                         if (!enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt))
 760                                 fprintf(stderr, " - not enough to start the array.\n");
 761                         else {
 762                                 if (req_cnt == info.array.raid_disks)
 763                                         fprintf(stderr, " - need all %d to start it", req_cnt);
 764                                 else
 765                                         fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
 766                                 fprintf(stderr, " (use --run to insist).\n");
 767                         }
 768                 }
 769                 return 1;
 770         } else {
 771                 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
 772                  * been updated to point to the current locations of devices.
 773                  * so we can just start the array
 774                  */
 775                 unsigned long dev;
 776                 dev = makedev(devices[chosen_drive].major,
 777                             devices[chosen_drive].minor);
 778                 if (ioctl(mdfd, START_ARRAY, dev)) {
 779                     fprintf(stderr, Name ": Cannot start array: %s\n",
 780                             strerror(errno));
 781                 }
 782
 783         }
 784         return 0;
 785 }