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 #include        "md_u.h"
  32 #include        "md_p.h"
  33
  34 int Assemble(char *mddev, int mdfd,
  35              mddev_ident_t ident, char *conffile,
  36              mddev_dev_t devlist,
  37              int readonly, int runstop,
  38              char *update,
  39              int verbose, int force)
  40 {
  41         /*
  42          * The task of Assemble is to find a collection of
  43          * devices that should (according to their superblocks)
  44          * form an array, and to give this collection to the MD driver.
  45          * In Linux-2.4 and later, this involves submitting a
  46          * SET_ARRAY_INFO ioctl with no arg - to prepare
  47          * the array - and then submit a number of
  48          * ADD_NEW_DISK ioctls to add disks into
  49          * the array.  Finally RUN_ARRAY might
  50          * be submitted to start the array.
  51          *
  52          * Much of the work of Assemble is in finding and/or
  53          * checking the disks to make sure they look right.
  54          *
  55          * If mddev is not set, then scan must be and we
  56          *  read through the config file for dev+uuid mapping
  57          *  We recurse, setting mddev, for each device that
  58          *    - isn't running
  59          *    - has a valid uuid (or any uuid if !uuidset
  60          *
  61          * If mddev is set, we try to determine state of md.
  62          *   check version - must be at least 0.90.0
  63          *   check kernel version.  must be at least 2.4.
  64          *    If not, we can possibly fall back on START_ARRAY
  65          *   Try to GET_ARRAY_INFO.
  66          *     If possible, give up
  67          *     If not, try to STOP_ARRAY just to make sure
  68          *
  69          * If !uuidset and scan, look in conf-file for uuid
  70          *       If not found, give up
  71          * If !devlist and scan and uuidset, get list of devs from conf-file
  72          *
  73          * For each device:
  74          *   Check superblock - discard if bad
  75          *   Check uuid (set if we don't have one) - discard if no match
  76          *   Check superblock similarity if we have a superblock - discard if different
  77          *   Record events, devicenum, utime
  78          * This should give us a list of devices for the array
  79          * We should collect the most recent event and utime numbers
  80          *
  81          * Count disks with recent enough event count
  82          * While force && !enough disks
  83          *    Choose newest rejected disks, update event count
  84          *     mark clean and rewrite superblock
  85          * If recent kernel:
  86          *    SET_ARRAY_INFO
  87          *    foreach device with recent events : ADD_NEW_DISK
  88          *    if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
  89          * If old kernel:
  90          *    Check the device numbers in superblock are right
  91          *    update superblock if any changes
  92          *    START_ARRAY
  93          *
  94          */
  95         int old_linux = 0;
  96         int vers;
  97         mdu_array_info_t array;
  98         mdp_super_t first_super, super;
  99         struct {
 100                 char *devname;
 101                 unsigned int major, minor;
 102                 unsigned int oldmajor, oldminor;
 103                 long long events;
 104                 time_t utime;
 105                 int uptodate;
 106                 int state;
 107                 int raid_disk;
 108         } *devices;
 109         int *best = NULL; /* indexed by raid_disk */
 110         unsigned int bestcnt = 0;
 111         int devcnt = 0;
 112         unsigned int okcnt, sparecnt;
 113         unsigned int req_cnt;
 114         unsigned int i;
 115         int most_recent = 0;
 116         int chosen_drive;
 117         int change = 0;
 118         int inargv = 0;
 119         int start_partial_ok = force || devlist==NULL;
 120         unsigned int num_devs;
 121         mddev_dev_t tmpdev;
 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, &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         best = malloc(num_devs * sizeof(*best));
 169         devices = malloc(num_devs * sizeof(*devices));
 170
 171         first_super.md_magic = 0;
 172         for (i=0; i<num_devs; i++)
 173                 best[i] = -1;
 174
 175         if (verbose)
 176             fprintf(stderr, Name ": looking for devices for %s\n",
 177                     mddev);
 178
 179         while ( devlist) {
 180                 char *devname;
 181                 int this_uuid[4];
 182                 int dfd;
 183                 struct stat stb;
 184                 int havesuper=0;
 185
 186                 devname = devlist->devname;
 187                 devlist = devlist->next;
 188
 189                 if (ident->devices &&
 190                     !match_oneof(ident->devices, devname)) {
 191                         if (inargv || verbose)
 192                                 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
 193                         continue;
 194                 }
 195
 196                 dfd = open(devname, O_RDONLY, 0);
 197                 if (dfd < 0) {
 198                         if (inargv || verbose)
 199                                 fprintf(stderr, Name ": cannot open device %s: %s\n",
 200                                         devname, strerror(errno));
 201                 } else if (fstat(dfd, &stb)< 0) {
 202                         /* Impossible! */
 203                         fprintf(stderr, Name ": fstat failed for %s: %s\n",
 204                                 devname, strerror(errno));
 205                         close(dfd);
 206                 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 207                         fprintf(stderr, Name ": %s is not a block device.\n",
 208                                 devname);
 209                         close(dfd);
 210                 } else if (load_super(dfd, &super)) {
 211                         if (inargv || verbose)
 212                                 fprintf( stderr, Name ": no RAID superblock on %s\n",
 213                                          devname);
 214                         close(dfd);
 215                 } else {
 216                         havesuper =1;
 217                         uuid_from_super(this_uuid, &super);
 218                         close(dfd);
 219                 }
 220
 221                 if (ident->uuid_set &&
 222                     (!havesuper || same_uuid(this_uuid, ident->uuid)==0)) {
 223                         if (inargv || verbose)
 224                                 fprintf(stderr, Name ": %s has wrong uuid.\n",
 225                                         devname);
 226                         continue;
 227                 }
 228                 if (ident->super_minor != UnSet &&
 229                     (!havesuper || ident->super_minor != super.md_minor)) {
 230                         if (inargv || verbose)
 231                                 fprintf(stderr, Name ": %s has wrong super-minor.\n",
 232                                         devname);
 233                         continue;
 234                 }
 235                 if (ident->level != UnSet &&
 236                     (!havesuper|| ident->level != (int)super.level)) {
 237                         if (inargv || verbose)
 238                                 fprintf(stderr, Name ": %s has wrong raid level.\n",
 239                                         devname);
 240                         continue;
 241                 }
 242                 if (ident->raid_disks != UnSet &&
 243                     (!havesuper || ident->raid_disks!= super.raid_disks)) {
 244                         if (inargv || verbose)
 245                                 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
 246                                         devname);
 247                         continue;
 248                 }
 249
 250                 /* If we are this far, then we are commited to this device.
 251                  * If the super_block doesn't exist, or doesn't match others,
 252                  * then we cannot continue
 253                  */
 254
 255                 if (!havesuper) {
 256                         fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
 257                                 devname);
 258                         return 1;
 259                 }
 260                 if (compare_super(&first_super, &super)) {
 261                         fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
 262                                 devname);
 263                         return 1;
 264                 }
 265
 266
 267                 /* this is needed until we get a more relaxed super block format */
 268                 if (devcnt >= MD_SB_DISKS) {
 269                     fprintf(stderr, Name ": ouch - too many devices appear to be in this array. Ignoring %s\n",
 270                             devname);
 271                     continue;
 272                 }
 273
 274                 /* looks like a good enough match to update the super block if needed */
 275                 if (update) {
 276                         if (strcmp(update, "sparc2.2")==0 ) {
 277                                 /* 2.2 sparc put the events in the wrong place
 278                                  * So we copy the tail of the superblock
 279                                  * up 4 bytes before continuing
 280                                  */
 281                                 __u32 *sb32 = (__u32*)&super;
 282                                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 283                                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 284                                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 285                                 fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
 286                                          devname);
 287                         }
 288                         if (strcmp(update, "super-minor") ==0) {
 289                                 struct stat stb2;
 290                                 fstat(mdfd, &stb2);
 291                                 super.md_minor = MINOR(stb2.st_rdev);
 292                                 if (verbose)
 293                                         fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
 294                                                 devname, super.md_minor);
 295                         }
 296                         if (strcmp(update, "summaries") == 0) {
 297                                 /* set nr_disks, active_disks, working_disks,
 298                                  * failed_disks, spare_disks based on disks[]
 299                                  * array in superblock.
 300                                  * Also make sure extra slots aren't 'failed'
 301                                  */
 302                                 super.nr_disks = super.active_disks =
 303                                         super.working_disks = super.failed_disks =
 304                                         super.spare_disks = 0;
 305                                 for (i=0; i < MD_SB_DISKS ; i++)
 306                                         if (super.disks[i].major ||
 307                                             super.disks[i].minor) {
 308                                                 int state = super.disks[i].state;
 309                                                 if (state & (1<<MD_DISK_REMOVED))
 310                                                         continue;
 311                                                 super.nr_disks++;
 312                                                 if (state & (1<<MD_DISK_ACTIVE))
 313                                                         super.active_disks++;
 314                                                 if (state & (1<<MD_DISK_FAULTY))
 315                                                         super.failed_disks++;
 316                                                 else
 317                                                         super.working_disks++;
 318                                                 if (state == 0)
 319                                                         super.spare_disks++;
 320                                         } else if (i >= super.raid_disks && super.disks[i].number == 0)
 321                                                 super.disks[i].state = 0;
 322                         }
 323                         super.sb_csum = calc_sb_csum(&super);
 324                         dfd = open(devname, O_RDWR, 0);
 325                         if (dfd < 0)
 326                                 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
 327                                         devname);
 328                         else if (store_super(dfd, &super))
 329                                 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
 330                                         devname);
 331                         if (dfd >= 0)
 332                                 close(dfd);
 333                 }
 334
 335                 if (verbose)
 336                         fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
 337                                 devname, mddev, super.this_disk.raid_disk);
 338                 devices[devcnt].devname = devname;
 339                 devices[devcnt].major = MAJOR(stb.st_rdev);
 340                 devices[devcnt].minor = MINOR(stb.st_rdev);
 341                 devices[devcnt].oldmajor = super.this_disk.major;
 342                 devices[devcnt].oldminor = super.this_disk.minor;
 343                 devices[devcnt].events = md_event(&super);
 344                 devices[devcnt].utime = super.utime;
 345                 devices[devcnt].raid_disk = super.this_disk.raid_disk;
 346                 devices[devcnt].uptodate = 0;
 347                 devices[devcnt].state = super.this_disk.state;
 348                 if (most_recent < devcnt) {
 349                         if (devices[devcnt].events
 350                             > devices[most_recent].events)
 351                                 most_recent = devcnt;
 352                 }
 353                 if ((int)super.level == -4)
 354                         /* with multipath, the raid_disk from the superblock is meaningless */
 355                         i = devcnt;
 356                 else
 357                         i = devices[devcnt].raid_disk;
 358                 if (i < 10000) {
 359                         if (i >= bestcnt) {
 360                                 unsigned int newbestcnt = i+10;
 361                                 int *newbest = malloc(sizeof(int)*newbestcnt);
 362                                 unsigned int c;
 363                                 for (c=0; c < newbestcnt; c++)
 364                                         if (c < bestcnt)
 365                                                 newbest[c] = best[c];
 366                                         else
 367                                                 newbest[c] = -1;
 368                                 if (best)free(best);
 369                                 best = newbest;
 370                                 bestcnt = newbestcnt;
 371                         }
 372                         if (best[i] == -1
 373                             || devices[best[i]].events < devices[devcnt].events)
 374                                 best[i] = devcnt;
 375                 }
 376                 devcnt++;
 377         }
 378
 379         if (devcnt == 0) {
 380                 fprintf(stderr, Name ": no devices found for %s\n",
 381                         mddev);
 382                 return 1;
 383         }
 384         /* now we have some devices that might be suitable.
 385          * I wonder how many
 386          */
 387         okcnt = 0;
 388         sparecnt=0;
 389         for (i=0; i< bestcnt ;i++) {
 390                 int j = best[i];
 391                 int event_margin = !force;
 392                 if (j < 0) continue;
 393                 /* note: we ignore error flags in multipath arrays
 394                  * as they don't make sense
 395                  */
 396                 if ((int)first_super.level != -4)
 397                         if (!(devices[j].state & (1<<MD_DISK_SYNC))) {
 398                                 if (!(devices[j].state & (1<<MD_DISK_FAULTY)))
 399                                         sparecnt++;
 400                                 continue;
 401                         }
 402                 if (devices[j].events+event_margin >=
 403                     devices[most_recent].events) {
 404                         devices[j].uptodate = 1;
 405                         if (i < first_super.raid_disks)
 406                                 okcnt++;
 407                         else
 408                                 sparecnt++;
 409                 }
 410         }
 411         while (force && !enough(first_super.level, first_super.raid_disks, okcnt)) {
 412                 /* Choose the newest best drive which is
 413                  * not up-to-date, update the superblock
 414                  * and add it.
 415                  */
 416                 int fd;
 417                 chosen_drive = -1;
 418                 for (i=0; i<first_super.raid_disks && i < bestcnt; i++) {
 419                         int j = best[i];
 420                         if (j>=0 &&
 421                             !devices[j].uptodate &&
 422                             devices[j].events > 0 &&
 423                             (chosen_drive < 0 ||
 424                              devices[j].events > devices[chosen_drive].events))
 425                                 chosen_drive = j;
 426                 }
 427                 if (chosen_drive < 0)
 428                         break;
 429                 fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
 430                         devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
 431                         (int)(devices[chosen_drive].events),
 432                         (int)(devices[most_recent].events));
 433                 fd = open(devices[chosen_drive].devname, O_RDWR);
 434                 if (fd < 0) {
 435                         fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
 436                                 devices[chosen_drive].devname);
 437                         devices[chosen_drive].events = 0;
 438                         continue;
 439                 }
 440                 if (load_super(fd, &super)) {
 441                         close(fd);
 442                         fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
 443                                 devices[chosen_drive].devname);
 444                         devices[chosen_drive].events = 0;
 445                         continue;
 446                 }
 447                 super.events_hi = (devices[most_recent].events>>32)&0xFFFFFFFF;
 448                 super.events_lo = (devices[most_recent].events)&0xFFFFFFFF;
 449                 if (super.level == 5 || super.level == 4) {
 450                         /* need to force clean */
 451                         super.state = (1<<MD_SB_CLEAN);
 452                 }
 453                 super.sb_csum = calc_sb_csum(&super);
 454 /*DRYRUN*/      if (store_super(fd, &super)) {
 455                         close(fd);
 456                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 457                                 devices[chosen_drive].devname);
 458                         devices[chosen_drive].events = 0;
 459                         continue;
 460                 }
 461                 close(fd);
 462                 devices[chosen_drive].events = devices[most_recent].events;
 463                 devices[chosen_drive].uptodate = 1;
 464                 okcnt++;
 465         }
 466
 467         /* Now we want to look at the superblock which the kernel will base things on
 468          * and compare the devices that we think are working with the devices that the
 469          * superblock thinks are working.
 470          * If there are differences and --force is given, then update this chosen
 471          * superblock.
 472          */
 473         chosen_drive = -1;
 474         for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
 475                 int j = best[i];
 476                 int fd;
 477                 if (j<0)
 478                         continue;
 479                 if (!devices[j].uptodate)
 480                         continue;
 481                 chosen_drive = j;
 482                 if ((fd=open(devices[j].devname, O_RDONLY))< 0) {
 483                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 484                                 devices[j].devname, strerror(errno));
 485                         return 1;
 486                 }
 487                 if (load_super(fd, &super)) {
 488                         close(fd);
 489                         fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
 490                                 devices[j].devname);
 491                         return 1;
 492                 }
 493                 close(fd);
 494         }
 495
 496         for (i=0; i<bestcnt; i++) {
 497                 int j = best[i];
 498                 unsigned int desired_state;
 499
 500                 if (i < super.raid_disks)
 501                         desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
 502                 else
 503                         desired_state = 0;
 504
 505                 if (j<0)
 506                         continue;
 507                 if (!devices[j].uptodate)
 508                         continue;
 509 #if 0
 510 This doesnt work yet
 511                 if (devices[j].major != super.disks[i].major ||
 512                     devices[j].minor != super.disks[i].minor) {
 513                         change |= 1;
 514                         super.disks[i].major = devices[j].major;
 515                         super.disks[i].minor = devices[j].minor;
 516                 }
 517 #endif
 518                 if (devices[j].oldmajor != super.disks[i].major ||
 519                     devices[j].oldminor != super.disks[i].minor) {
 520                         change |= 2;
 521                         super.disks[i].major = devices[j].oldmajor;
 522                         super.disks[i].minor = devices[j].oldminor;
 523                 }
 524                 if (devices[j].uptodate &&
 525                     (super.disks[i].state != desired_state)) {
 526                         if (force) {
 527                                 fprintf(stderr, Name ": "
 528                                         "clearing FAULTY flag for device %d in %s for %s\n",
 529                                         j, mddev, devices[j].devname);
 530                                 super.disks[i].state = desired_state;
 531                                 change |= 2;
 532                         } else {
 533                                 fprintf(stderr, Name ": "
 534                                         "device %d in %s has wrong state in superblock, but %s seems ok\n",
 535                                         i, mddev, devices[j].devname);
 536                         }
 537                 }
 538                 if (!devices[j].uptodate &&
 539                     !(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
 540                         fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
 541                                 i, mddev);
 542                 }
 543         }
 544         if (force && (super.level == 4 || super.level == 5) &&
 545             okcnt == super.raid_disks-1) {
 546                 super.state = (1<< MD_SB_CLEAN);
 547                 change |= 2;
 548         }
 549
 550         if ((force && (change & 2))
 551             || (old_linux && (change & 1))) {
 552                 int fd;
 553                 super.sb_csum = calc_sb_csum(&super);
 554                 fd = open(devices[chosen_drive].devname, O_RDWR);
 555                 if (fd < 0) {
 556                         fprintf(stderr, Name ": Could open %s for write - cannot Assemble array.\n",
 557                                 devices[chosen_drive].devname);
 558                         return 1;
 559                 }
 560                 if (store_super(fd, &super)) {
 561                         close(fd);
 562                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 563                                 devices[chosen_drive].devname);
 564                         return 1;
 565                 }
 566                 close(fd);
 567                 change = 0;
 568         }
 569
 570         /* count number of in-sync devices according to the superblock.
 571          * We must have this number to start the array without -s or -R
 572          */
 573         req_cnt = 0;
 574         for (i=0; i<MD_SB_DISKS; i++)
 575                 if ((first_super.disks[i].state & (1<<MD_DISK_SYNC)) &&
 576                     (first_super.disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 577                     !(first_super.disks[i].state & (1<<MD_DISK_FAULTY)))
 578                         req_cnt ++;
 579
 580
 581         /* Almost ready to actually *do* something */
 582         if (!old_linux) {
 583                 if (ioctl(mdfd, SET_ARRAY_INFO, NULL) != 0) {
 584                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 585                                 mddev, strerror(errno));
 586                         return 1;
 587                 }
 588                 /* First, add the raid disks, but add the chosen one last */
 589                 for (i=0; i<= bestcnt; i++) {
 590                         int j;
 591                         if (i < bestcnt) {
 592                                 j = best[i];
 593                                 if (j == chosen_drive)
 594                                         continue;
 595                         } else
 596                                 j = chosen_drive;
 597
 598                         if (j >= 0 /* && devices[j].uptodate */) {
 599                                 mdu_disk_info_t disk;
 600                                 memset(&disk, 0, sizeof(disk));
 601                                 disk.major = devices[j].major;
 602                                 disk.minor = devices[j].minor;
 603                                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
 604                                         fprintf(stderr, Name ": failed to add %s to %s: %s\n",
 605                                                 devices[j].devname,
 606                                                 mddev,
 607                                                 strerror(errno));
 608                                         if (i < first_super.raid_disks)
 609                                                 okcnt--;
 610                                         else
 611                                                 sparecnt--;
 612                                 } else if (verbose)
 613                                         fprintf(stderr, Name ": added %s to %s as %d\n",
 614                                                 devices[j].devname, mddev, devices[j].raid_disk);
 615                         } else if (verbose && i < first_super.raid_disks)
 616                                 fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
 617                                         i, mddev);
 618                 }
 619
 620                 if (runstop == 1 ||
 621                     (runstop == 0 &&
 622                      ( enough(first_super.level, first_super.raid_disks, okcnt) &&
 623                        (okcnt >= req_cnt || start_partial_ok)
 624                              ))) {
 625                         if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
 626                                 fprintf(stderr, Name ": %s has been started with %d drive%s",
 627                                         mddev, okcnt, okcnt==1?"":"s");
 628                                 if (okcnt < first_super.raid_disks)
 629                                         fprintf(stderr, " (out of %d)", first_super.raid_disks);
 630                                 if (sparecnt)
 631                                         fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 632                                 fprintf(stderr, ".\n");
 633                                 return 0;
 634                         }
 635                         fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
 636                                 mddev, strerror(errno));
 637                         return 1;
 638                 }
 639                 if (runstop == -1) {
 640                         fprintf(stderr, Name ": %s assembled from %d drive%s, but not started.\n",
 641                                 mddev, okcnt, okcnt==1?"":"s");
 642                         return 0;
 643                 }
 644                 fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
 645                 if (sparecnt)
 646                         fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 647                 if (!enough(first_super.level, first_super.raid_disks, okcnt))
 648                         fprintf(stderr, " - not enough to start the array.\n");
 649                 else {
 650                         if (req_cnt == first_super.raid_disks)
 651                                 fprintf(stderr, " - need all %d to start it", req_cnt);
 652                         else
 653                                 fprintf(stderr, " - need %d of %d to start", req_cnt, first_super.raid_disks);
 654                         fprintf(stderr, " (use --run to insist).\n");
 655                 }
 656                 return 1;
 657         } else {
 658                 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
 659                  * been updated to point to the current locations of devices.
 660                  * so we can just start the array
 661                  */
 662                 unsigned long dev;
 663                 dev = MKDEV(devices[chosen_drive].major,
 664                             devices[chosen_drive].minor);
 665                 if (ioctl(mdfd, START_ARRAY, dev)) {
 666                     fprintf(stderr, Name ": Cannot start array: %s\n",
 667                             strerror(errno));
 668                 }
 669
 670         }
 671         return 0;
 672 }