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|O_EXCL, 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                         if (strcmp(update, "resync") == 0) {
 324                                 /* make sure resync happens */
 325                                 super.state &= ~(1<<MD_SB_CLEAN);
 326                                 super.recovery_cp = 0;
 327                         }
 328                         super.sb_csum = calc_sb_csum(&super);
 329                         dfd = open(devname, O_RDWR|O_EXCL, 0);
 330                         if (dfd < 0)
 331                                 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
 332                                         devname);
 333                         else if (store_super(dfd, &super))
 334                                 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
 335                                         devname);
 336                         if (dfd >= 0)
 337                                 close(dfd);
 338                 }
 339
 340                 if (verbose)
 341                         fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
 342                                 devname, mddev, super.this_disk.raid_disk);
 343                 devices[devcnt].devname = devname;
 344                 devices[devcnt].major = major(stb.st_rdev);
 345                 devices[devcnt].minor = minor(stb.st_rdev);
 346                 devices[devcnt].oldmajor = super.this_disk.major;
 347                 devices[devcnt].oldminor = super.this_disk.minor;
 348                 devices[devcnt].events = md_event(&super);
 349                 devices[devcnt].utime = super.utime;
 350                 devices[devcnt].raid_disk = super.this_disk.raid_disk;
 351                 devices[devcnt].uptodate = 0;
 352                 devices[devcnt].state = super.this_disk.state;
 353                 if (most_recent < devcnt) {
 354                         if (devices[devcnt].events
 355                             > devices[most_recent].events)
 356                                 most_recent = devcnt;
 357                 }
 358                 if ((int)super.level == -4)
 359                         /* with multipath, the raid_disk from the superblock is meaningless */
 360                         i = devcnt;
 361                 else
 362                         i = devices[devcnt].raid_disk;
 363                 if (i < 10000) {
 364                         if (i >= bestcnt) {
 365                                 unsigned int newbestcnt = i+10;
 366                                 int *newbest = malloc(sizeof(int)*newbestcnt);
 367                                 unsigned int c;
 368                                 for (c=0; c < newbestcnt; c++)
 369                                         if (c < bestcnt)
 370                                                 newbest[c] = best[c];
 371                                         else
 372                                                 newbest[c] = -1;
 373                                 if (best)free(best);
 374                                 best = newbest;
 375                                 bestcnt = newbestcnt;
 376                         }
 377                         if (best[i] == -1
 378                             || devices[best[i]].events < devices[devcnt].events)
 379                                 best[i] = devcnt;
 380                 }
 381                 devcnt++;
 382         }
 383
 384         if (devcnt == 0) {
 385                 fprintf(stderr, Name ": no devices found for %s\n",
 386                         mddev);
 387                 return 1;
 388         }
 389         /* now we have some devices that might be suitable.
 390          * I wonder how many
 391          */
 392         okcnt = 0;
 393         sparecnt=0;
 394         for (i=0; i< bestcnt ;i++) {
 395                 int j = best[i];
 396                 int event_margin = !force;
 397                 if (j < 0) continue;
 398                 /* note: we ignore error flags in multipath arrays
 399                  * as they don't make sense
 400                  */
 401                 if ((int)first_super.level != -4)
 402                         if (!(devices[j].state & (1<<MD_DISK_SYNC))) {
 403                                 if (!(devices[j].state & (1<<MD_DISK_FAULTY)))
 404                                         sparecnt++;
 405                                 continue;
 406                         }
 407                 if (devices[j].events+event_margin >=
 408                     devices[most_recent].events) {
 409                         devices[j].uptodate = 1;
 410                         if (i < first_super.raid_disks)
 411                                 okcnt++;
 412                         else
 413                                 sparecnt++;
 414                 }
 415         }
 416         while (force && !enough(first_super.level, first_super.raid_disks, okcnt)) {
 417                 /* Choose the newest best drive which is
 418                  * not up-to-date, update the superblock
 419                  * and add it.
 420                  */
 421                 int fd;
 422                 chosen_drive = -1;
 423                 for (i=0; i<first_super.raid_disks && i < bestcnt; i++) {
 424                         int j = best[i];
 425                         if (j>=0 &&
 426                             !devices[j].uptodate &&
 427                             devices[j].events > 0 &&
 428                             (chosen_drive < 0 ||
 429                              devices[j].events > devices[chosen_drive].events))
 430                                 chosen_drive = j;
 431                 }
 432                 if (chosen_drive < 0)
 433                         break;
 434                 fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
 435                         devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
 436                         (int)(devices[chosen_drive].events),
 437                         (int)(devices[most_recent].events));
 438                 fd = open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 439                 if (fd < 0) {
 440                         fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
 441                                 devices[chosen_drive].devname);
 442                         devices[chosen_drive].events = 0;
 443                         continue;
 444                 }
 445                 if (load_super(fd, &super)) {
 446                         close(fd);
 447                         fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
 448                                 devices[chosen_drive].devname);
 449                         devices[chosen_drive].events = 0;
 450                         continue;
 451                 }
 452                 super.events_hi = (devices[most_recent].events>>32)&0xFFFFFFFF;
 453                 super.events_lo = (devices[most_recent].events)&0xFFFFFFFF;
 454                 if (super.level == 5 || super.level == 4) {
 455                         /* need to force clean */
 456                         super.state = (1<<MD_SB_CLEAN);
 457                 }
 458                 super.sb_csum = calc_sb_csum(&super);
 459 /*DRYRUN*/      if (store_super(fd, &super)) {
 460                         close(fd);
 461                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 462                                 devices[chosen_drive].devname);
 463                         devices[chosen_drive].events = 0;
 464                         continue;
 465                 }
 466                 close(fd);
 467                 devices[chosen_drive].events = devices[most_recent].events;
 468                 devices[chosen_drive].uptodate = 1;
 469                 okcnt++;
 470         }
 471
 472         /* Now we want to look at the superblock which the kernel will base things on
 473          * and compare the devices that we think are working with the devices that the
 474          * superblock thinks are working.
 475          * If there are differences and --force is given, then update this chosen
 476          * superblock.
 477          */
 478         chosen_drive = -1;
 479         for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
 480                 int j = best[i];
 481                 int fd;
 482                 if (j<0)
 483                         continue;
 484                 if (!devices[j].uptodate)
 485                         continue;
 486                 chosen_drive = j;
 487                 if ((fd=open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
 488                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 489                                 devices[j].devname, strerror(errno));
 490                         return 1;
 491                 }
 492                 if (load_super(fd, &super)) {
 493                         close(fd);
 494                         fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
 495                                 devices[j].devname);
 496                         return 1;
 497                 }
 498                 close(fd);
 499         }
 500
 501         for (i=0; i<bestcnt; i++) {
 502                 int j = best[i];
 503                 unsigned int desired_state;
 504
 505                 if (i < super.raid_disks)
 506                         desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
 507                 else
 508                         desired_state = 0;
 509
 510                 if (j<0)
 511                         continue;
 512                 if (!devices[j].uptodate)
 513                         continue;
 514 #if 0
 515 This doesnt work yet
 516                 if (devices[j].major != super.disks[i].major ||
 517                     devices[j].minor != super.disks[i].minor) {
 518                         change |= 1;
 519                         super.disks[i].major = devices[j].major;
 520                         super.disks[i].minor = devices[j].minor;
 521                 }
 522 #endif
 523                 if (devices[j].oldmajor != super.disks[i].major ||
 524                     devices[j].oldminor != super.disks[i].minor) {
 525                         change |= 2;
 526                         super.disks[i].major = devices[j].oldmajor;
 527                         super.disks[i].minor = devices[j].oldminor;
 528                 }
 529                 if (devices[j].uptodate &&
 530                     (super.disks[i].state != desired_state)) {
 531                         if (force) {
 532                                 fprintf(stderr, Name ": "
 533                                         "clearing FAULTY flag for device %d in %s for %s\n",
 534                                         j, mddev, devices[j].devname);
 535                                 super.disks[i].state = desired_state;
 536                                 change |= 2;
 537                         } else {
 538                                 fprintf(stderr, Name ": "
 539                                         "device %d in %s has wrong state in superblock, but %s seems ok\n",
 540                                         i, mddev, devices[j].devname);
 541                         }
 542                 }
 543                 if (!devices[j].uptodate &&
 544                     !(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
 545                         fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
 546                                 i, mddev);
 547                 }
 548         }
 549         if (force && (super.level == 4 || super.level == 5) &&
 550             okcnt == super.raid_disks-1) {
 551                 super.state = (1<< MD_SB_CLEAN);
 552                 change |= 2;
 553         }
 554
 555         if ((force && (change & 2))
 556             || (old_linux && (change & 1))) {
 557                 int fd;
 558                 super.sb_csum = calc_sb_csum(&super);
 559                 fd = open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
 560                 if (fd < 0) {
 561                         fprintf(stderr, Name ": Could open %s for write - cannot Assemble array.\n",
 562                                 devices[chosen_drive].devname);
 563                         return 1;
 564                 }
 565                 if (store_super(fd, &super)) {
 566                         close(fd);
 567                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
 568                                 devices[chosen_drive].devname);
 569                         return 1;
 570                 }
 571                 close(fd);
 572                 change = 0;
 573         }
 574
 575         /* count number of in-sync devices according to the superblock.
 576          * We must have this number to start the array without -s or -R
 577          */
 578         req_cnt = 0;
 579         for (i=0; i<MD_SB_DISKS; i++)
 580                 if ((first_super.disks[i].state & (1<<MD_DISK_SYNC)) &&
 581                     (first_super.disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 582                     !(first_super.disks[i].state & (1<<MD_DISK_FAULTY)))
 583                         req_cnt ++;
 584
 585
 586         /* Almost ready to actually *do* something */
 587         if (!old_linux) {
 588                 if (ioctl(mdfd, SET_ARRAY_INFO, NULL) != 0) {
 589                         fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 590                                 mddev, strerror(errno));
 591                         return 1;
 592                 }
 593                 /* First, add the raid disks, but add the chosen one last */
 594                 for (i=0; i<= bestcnt; i++) {
 595                         int j;
 596                         if (i < bestcnt) {
 597                                 j = best[i];
 598                                 if (j == chosen_drive)
 599                                         continue;
 600                         } else
 601                                 j = chosen_drive;
 602
 603                         if (j >= 0 /* && devices[j].uptodate */) {
 604                                 mdu_disk_info_t disk;
 605                                 memset(&disk, 0, sizeof(disk));
 606                                 disk.major = devices[j].major;
 607                                 disk.minor = devices[j].minor;
 608                                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
 609                                         fprintf(stderr, Name ": failed to add %s to %s: %s\n",
 610                                                 devices[j].devname,
 611                                                 mddev,
 612                                                 strerror(errno));
 613                                         if (i < first_super.raid_disks || i == bestcnt)
 614                                                 okcnt--;
 615                                         else
 616                                                 sparecnt--;
 617                                 } else if (verbose)
 618                                         fprintf(stderr, Name ": added %s to %s as %d\n",
 619                                                 devices[j].devname, mddev, devices[j].raid_disk);
 620                         } else if (verbose && i < first_super.raid_disks)
 621                                 fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
 622                                         i, mddev);
 623                 }
 624
 625                 if (runstop == 1 ||
 626                     (runstop == 0 &&
 627                      ( enough(first_super.level, first_super.raid_disks, okcnt) &&
 628                        (okcnt >= req_cnt || start_partial_ok)
 629                              ))) {
 630                         if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
 631                                 fprintf(stderr, Name ": %s has been started with %d drive%s",
 632                                         mddev, okcnt, okcnt==1?"":"s");
 633                                 if (okcnt < first_super.raid_disks)
 634                                         fprintf(stderr, " (out of %d)", first_super.raid_disks);
 635                                 if (sparecnt)
 636                                         fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 637                                 fprintf(stderr, ".\n");
 638                                 return 0;
 639                         }
 640                         fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
 641                                 mddev, strerror(errno));
 642                         return 1;
 643                 }
 644                 if (runstop == -1) {
 645                         fprintf(stderr, Name ": %s assembled from %d drive%s, but not started.\n",
 646                                 mddev, okcnt, okcnt==1?"":"s");
 647                         return 0;
 648                 }
 649                 fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
 650                 if (sparecnt)
 651                         fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
 652                 if (!enough(first_super.level, first_super.raid_disks, okcnt))
 653                         fprintf(stderr, " - not enough to start the array.\n");
 654                 else {
 655                         if (req_cnt == first_super.raid_disks)
 656                                 fprintf(stderr, " - need all %d to start it", req_cnt);
 657                         else
 658                                 fprintf(stderr, " - need %d of %d to start", req_cnt, first_super.raid_disks);
 659                         fprintf(stderr, " (use --run to insist).\n");
 660                 }
 661                 return 1;
 662         } else {
 663                 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
 664                  * been updated to point to the current locations of devices.
 665                  * so we can just start the array
 666                  */
 667                 unsigned long dev;
 668                 dev = makedev(devices[chosen_drive].major,
 669                             devices[chosen_drive].minor);
 670                 if (ioctl(mdfd, START_ARRAY, dev)) {
 671                     fprintf(stderr, Name ": Cannot start array: %s\n",
 672                             strerror(errno));
 673                 }
 674
 675         }
 676         return 0;
 677 }