Incremental.c

   1 /*
   2  * Incremental.c - support --incremental.  Part of:
   3  * mdadm - manage Linux "md" devices aka RAID arrays.
   4  *
   5  * Copyright (C) 2006 Neil Brown <neilb@suse.de>
   6  *
   7  *
   8  *    This program is free software; you can redistribute it and/or modify
   9  *    it under the terms of the GNU General Public License as published by
  10  *    the Free Software Foundation; either version 2 of the License, or
  11  *    (at your option) any later version.
  12  *
  13  *    This program is distributed in the hope that it will be useful,
  14  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *    GNU General Public License for more details.
  17  *
  18  *    You should have received a copy of the GNU General Public License
  19  *    along with this program; if not, write to the Free Software
  20  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  *    Author: Neil Brown
  23  *    Email: <neilb@suse.de>
  24  *    Paper: Neil Brown
  25  *           Novell Inc
  26  *           GPO Box Q1283
  27  *           QVB Post Office, NSW 1230
  28  *           Australia
  29  */
  30
  31 #include        "mdadm.h"
  32
  33 static int count_active(struct supertype *st, int mdfd, char **availp,
  34                         struct mdinfo *info);
  35 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
  36                         int number, __u64 events, int verbose,
  37                         char *array_name);
  38
  39 int Incremental(char *devname, int verbose, int runstop,
  40                 struct supertype *st, char *homehost, int autof)
  41 {
  42         /* Add this device to an array, creating the array if necessary
  43          * and starting the array if sensible or - if runstop>0 - if possible.
  44          *
  45          * This has several steps:
  46          *
  47          * 1/ Check if device is permitted by mdadm.conf, reject if not.
  48          * 2/ Find metadata, reject if none appropriate (check
  49          *       version/name from args)
  50          * 3/ Check if there is a match in mdadm.conf
  51          * 3a/ if not, check for homehost match.  If no match, assemble as
  52          *    a 'foreign' array.
  53          * 4/ Determine device number.
  54          * - If in mdadm.conf with std name, use that
  55          * - UUID in /var/run/mdadm.map  use that
  56          * - If name is suggestive, use that. unless in use with different uuid.
  57          * - Choose a free, high number.
  58          * - Use a partitioned device unless strong suggestion not to.
  59          *         e.g. auto=md
  60          *   Don't choose partitioned for containers.
  61          * 5/ Find out if array already exists
  62          * 5a/ if it does not
  63          * - choose a name, from mdadm.conf or 'name' field in array.
  64          * - create the array
  65          * - add the device
  66          * 5b/ if it does
  67          * - check one drive in array to make sure metadata is a reasonably
  68          *       close match.  Reject if not (e.g. different type)
  69          * - add the device
  70          * 6/ Make sure /var/run/mdadm.map contains this array.
  71          * 7/ Is there enough devices to possibly start the array?
  72          *     For a container, this means running Incremental_container.
  73          * 7a/ if not, finish with success.
  74          * 7b/ if yes,
  75          * - read all metadata and arrange devices like -A does
  76          * - if number of OK devices match expected, or -R and there are enough,
  77          *   start the array (auto-readonly).
  78          */
  79         struct stat stb;
  80         struct mdinfo info;
  81         struct mddev_ident_s *array_list, *match;
  82         char chosen_name[1024];
  83         int rv;
  84         struct map_ent *mp, *map = NULL;
  85         int dfd, mdfd;
  86         char *avail;
  87         int active_disks;
  88         int trustworthy = FOREIGN;
  89         char *name_to_use;
  90         mdu_array_info_t ainf;
  91
  92         struct createinfo *ci = conf_get_create_info();
  93
  94
  95         /* 1/ Check if device is permitted by mdadm.conf */
  96
  97         if (!conf_test_dev(devname)) {
  98                 if (verbose >= 0)
  99                         fprintf(stderr, Name
 100                                 ": %s not permitted by mdadm.conf.\n",
 101                                 devname);
 102                 return 1;
 103         }
 104
 105         /* 2/ Find metadata, reject if none appropriate (check
 106          *            version/name from args) */
 107
 108         dfd = dev_open(devname, O_RDONLY|O_EXCL);
 109         if (dfd < 0) {
 110                 if (verbose >= 0)
 111                         fprintf(stderr, Name ": cannot open %s: %s.\n",
 112                                 devname, strerror(errno));
 113                 return 1;
 114         }
 115         if (fstat(dfd, &stb) < 0) {
 116                 if (verbose >= 0)
 117                         fprintf(stderr, Name ": fstat failed for %s: %s.\n",
 118                                 devname, strerror(errno));
 119                 close(dfd);
 120                 return 1;
 121         }
 122         if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 123                 if (verbose >= 0)
 124                         fprintf(stderr, Name ": %s is not a block device.\n",
 125                                 devname);
 126                 close(dfd);
 127                 return 1;
 128         }
 129
 130         if (st == NULL && (st = guess_super(dfd)) == NULL) {
 131                 if (verbose >= 0)
 132                         fprintf(stderr, Name
 133                                 ": no recognisable superblock on %s.\n",
 134                                 devname);
 135                 close(dfd);
 136                 return 1;
 137         }
 138         if (st->ss->load_super(st, dfd, NULL)) {
 139                 if (verbose >= 0)
 140                         fprintf(stderr, Name ": no RAID superblock on %s.\n",
 141                                 devname);
 142                 close(dfd);
 143                 return 1;
 144         }
 145         close (dfd);
 146
 147         memset(&info, 0, sizeof(info));
 148         st->ss->getinfo_super(st, &info);
 149         /* 3/ Check if there is a match in mdadm.conf */
 150
 151         array_list = conf_get_ident(NULL);
 152         match = NULL;
 153         for (; array_list; array_list = array_list->next) {
 154                 if (array_list->uuid_set &&
 155                     same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
 156                     == 0) {
 157                         if (verbose >= 2 && array_list->devname)
 158                                 fprintf(stderr, Name
 159                                         ": UUID differs from %s.\n",
 160                                         array_list->devname);
 161                         continue;
 162                 }
 163                 if (array_list->name[0] &&
 164                     strcasecmp(array_list->name, info.name) != 0) {
 165                         if (verbose >= 2 && array_list->devname)
 166                                 fprintf(stderr, Name
 167                                         ": Name differs from %s.\n",
 168                                         array_list->devname);
 169                         continue;
 170                 }
 171                 if (array_list->devices &&
 172                     !match_oneof(array_list->devices, devname)) {
 173                         if (verbose >= 2 && array_list->devname)
 174                                 fprintf(stderr, Name
 175                                         ": Not a listed device for %s.\n",
 176                                         array_list->devname);
 177                         continue;
 178                 }
 179                 if (array_list->super_minor != UnSet &&
 180                     array_list->super_minor != info.array.md_minor) {
 181                         if (verbose >= 2 && array_list->devname)
 182                                 fprintf(stderr, Name
 183                                         ": Different super-minor to %s.\n",
 184                                         array_list->devname);
 185                         continue;
 186                 }
 187                 if (!array_list->uuid_set &&
 188                     !array_list->name[0] &&
 189                     !array_list->devices &&
 190                     array_list->super_minor == UnSet) {
 191                         if (verbose >= 2 && array_list->devname)
 192                                 fprintf(stderr, Name
 193                              ": %s doesn't have any identifying information.\n",
 194                                         array_list->devname);
 195                         continue;
 196                 }
 197                 /* FIXME, should I check raid_disks and level too?? */
 198
 199                 if (match) {
 200                         if (verbose >= 0) {
 201                                 if (match->devname && array_list->devname)
 202                                         fprintf(stderr, Name
 203                    ": we match both %s and %s - cannot decide which to use.\n",
 204                                                 match->devname, array_list->devname);
 205                                 else
 206                                         fprintf(stderr, Name
 207                                                 ": multiple lines in mdadm.conf match\n");
 208                         }
 209                         return 2;
 210                 }
 211                 match = array_list;
 212         }
 213
 214         /* 3a/ if not, check for homehost match.  If no match, continue
 215          * but don't trust the 'name' in the array. Thus a 'random' minor
 216          * number will be assigned, and the device name will be based
 217          * on that. */
 218         if (match)
 219                 trustworthy = LOCAL;
 220         else if (homehost == NULL ||
 221                  st->ss->match_home(st, homehost) != 1)
 222                 trustworthy = FOREIGN;
 223         name_to_use = strchr(info.name, ':');
 224         if (name_to_use)
 225                 name_to_use++;
 226         else
 227                 name_to_use = info.name;
 228
 229         /* There are three possible sources for 'autof':  command line,
 230          * ARRAY line in mdadm.conf, or CREATE line in mdadm.conf.
 231          * ARRAY takes precedence, then command line, then
 232          * CREATE.
 233          */
 234         if (match && match->autof)
 235                 autof = match->autof;
 236         if (autof == 0)
 237                 autof = ci->autof;
 238
 239         if (st->ss->container_content && st->loaded_container) {
 240                 /* This is a pre-built container array, so we do something
 241                  * rather different.
 242                  */
 243                 return Incremental_container(st, devname, verbose, runstop,
 244                                              autof, trustworthy);
 245         }
 246         /* 4/ Check if array exists.
 247          */
 248         map_lock(&map);
 249         mp = map_by_uuid(&map, info.uuid);
 250         if (mp) {
 251                 mdfd = open_mddev(mp->path, 0);
 252                 if (mdfd < 0 && mddev_busy(mp->devnum)) {
 253                         /* maybe udev hasn't created it yet. */
 254                         char buf[50];
 255                         sprintf(buf, "%d:%d", dev2major(mp->devnum),
 256                                 dev2minor(mp->devnum));
 257                         mdfd = dev_open(buf, O_RDWR);
 258                 }
 259         } else
 260                 mdfd = -1;
 261
 262         if (mdfd < 0) {
 263                 struct mdinfo *sra;
 264                 struct mdinfo dinfo;
 265
 266                 /* Couldn't find an existing array, maybe make a new one */
 267                 mdfd = create_mddev(match ? match->devname : NULL,
 268                                     info.name, autof, trustworthy, chosen_name);
 269
 270
 271                 if (mdfd < 0)
 272                         return 1;
 273
 274                 sysfs_init(&info, mdfd, 0);
 275
 276                 if (set_array_info(mdfd, st, &info) != 0) {
 277                         fprintf(stderr, Name ": failed to set array info for %s: %s\n",
 278                                 chosen_name, strerror(errno));
 279                         close(mdfd);
 280                         return 2;
 281                 }
 282
 283                 dinfo = info;
 284                 dinfo.disk.major = major(stb.st_rdev);
 285                 dinfo.disk.minor = minor(stb.st_rdev);
 286                 if (add_disk(mdfd, st, &info, &dinfo) != 0) {
 287                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 288                                 devname, chosen_name, strerror(errno));
 289                         ioctl(mdfd, STOP_ARRAY, 0);
 290                         close(mdfd);
 291                         return 2;
 292                 }
 293                 sra = sysfs_read(mdfd, fd2devnum(mdfd), GET_DEVS);
 294                 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
 295                         /* It really should be 'none' - must be old buggy
 296                          * kernel, and mdadm -I may not be able to complete.
 297                          * So reject it.
 298                          */
 299                         ioctl(mdfd, STOP_ARRAY, NULL);
 300                         fprintf(stderr, Name
 301                       ": You have an old buggy kernel which cannot support\n"
 302                                 "      --incremental reliably.  Aborting.\n");
 303                         close(mdfd);
 304                         sysfs_free(sra);
 305                         return 2;
 306                 }
 307                 info.array.working_disks = 1;
 308                 sysfs_free(sra);
 309                 /* 6/ Make sure /var/run/mdadm.map contains this array. */
 310                 map_update(&map, fd2devnum(mdfd),
 311                            info.text_version,
 312                            info.uuid, chosen_name);
 313         } else {
 314         /* 5b/ if it does */
 315         /* - check one drive in array to make sure metadata is a reasonably */
 316         /*        close match.  Reject if not (e.g. different type) */
 317         /* - add the device */
 318                 char dn[20];
 319                 int dfd2;
 320                 int err;
 321                 struct mdinfo *sra;
 322                 struct supertype *st2;
 323                 struct mdinfo info2, *d;
 324
 325                 strcpy(chosen_name, mp->path);
 326
 327                 sra = sysfs_read(mdfd, fd2devnum(mdfd), (GET_DEVS | GET_STATE));
 328
 329                 sprintf(dn, "%d:%d", sra->devs->disk.major,
 330                         sra->devs->disk.minor);
 331                 dfd2 = dev_open(dn, O_RDONLY);
 332                 st2 = dup_super(st);
 333                 if (st2->ss->load_super(st2, dfd2, NULL) ||
 334                     st->ss->compare_super(st, st2) != 0) {
 335                         fprintf(stderr, Name
 336                                 ": metadata mismatch between %s and "
 337                                 "chosen array %s\n",
 338                                 devname, chosen_name);
 339                         close(mdfd);
 340                         close(dfd2);
 341                         return 2;
 342                 }
 343                 close(dfd2);
 344                 memset(&info2, 0, sizeof(info2));
 345                 st2->ss->getinfo_super(st2, &info2);
 346                 st2->ss->free_super(st2);
 347                 if (info.array.level != info2.array.level ||
 348                     memcmp(info.uuid, info2.uuid, 16) != 0 ||
 349                     info.array.raid_disks != info2.array.raid_disks) {
 350                         fprintf(stderr, Name
 351                                 ": unexpected difference between %s and %s.\n",
 352                                 chosen_name, devname);
 353                         close(mdfd);
 354                         return 2;
 355                 }
 356                 info2.disk.major = major(stb.st_rdev);
 357                 info2.disk.minor = minor(stb.st_rdev);
 358                 /* add disk needs to know about containers */
 359                 if (st->ss->external)
 360                         sra->array.level = LEVEL_CONTAINER;
 361                 err = add_disk(mdfd, st2, sra, &info2);
 362                 if (err < 0 && errno == EBUSY) {
 363                         /* could be another device present with the same
 364                          * disk.number. Find and reject any such
 365                          */
 366                         find_reject(mdfd, st, sra, info.disk.number,
 367                                     info.events, verbose, chosen_name);
 368                         err = add_disk(mdfd, st2, sra, &info2);
 369                 }
 370                 if (err < 0) {
 371                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 372                                 devname, chosen_name, strerror(errno));
 373                         close(mdfd);
 374                         return 2;
 375                 }
 376                 info.array.working_disks = 0;
 377                 for (d = sra->devs; d; d=d->next)
 378                         info.array.working_disks ++;
 379
 380         }
 381
 382         /* 7/ Is there enough devices to possibly start the array? */
 383         /* 7a/ if not, finish with success. */
 384         if (info.array.level == LEVEL_CONTAINER) {
 385                 /* Try to assemble within the container */
 386                 close(mdfd);
 387                 map_unlock(&map);
 388                 sysfs_uevent(&info, "change");
 389                 if (verbose >= 0)
 390                         fprintf(stderr, Name
 391                                 ": container %s now has %d devices\n",
 392                                 chosen_name, info.array.working_disks);
 393                 wait_for(chosen_name);
 394                 return Incremental(chosen_name, verbose, runstop,
 395                                    NULL, homehost, autof);
 396         }
 397         avail = NULL;
 398         active_disks = count_active(st, mdfd, &avail, &info);
 399         if (enough(info.array.level, info.array.raid_disks,
 400                    info.array.layout, info.array.state & 1,
 401                    avail, active_disks) == 0) {
 402                 free(avail);
 403                 if (verbose >= 0)
 404                         fprintf(stderr, Name
 405                              ": %s attached to %s, not enough to start (%d).\n",
 406                                 devname, chosen_name, active_disks);
 407                 map_unlock(&map);
 408                 close(mdfd);
 409                 return 0;
 410         }
 411         free(avail);
 412
 413         /* 7b/ if yes, */
 414         /* - if number of OK devices match expected, or -R and there */
 415         /*             are enough, */
 416         /*   + add any bitmap file  */
 417         /*   + start the array (auto-readonly). */
 418
 419         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 420                 if (verbose >= 0)
 421                         fprintf(stderr, Name
 422                            ": %s attached to %s which is already active.\n",
 423                                 devname, chosen_name);
 424                 close(mdfd);
 425                 map_unlock(&map);
 426                 return 0;
 427         }
 428
 429         map_unlock(&map);
 430         if (runstop > 0 || active_disks >= info.array.working_disks) {
 431                 struct mdinfo *sra;
 432                 /* Let's try to start it */
 433                 if (match && match->bitmap_file) {
 434                         int bmfd = open(match->bitmap_file, O_RDWR);
 435                         if (bmfd < 0) {
 436                                 fprintf(stderr, Name
 437                                         ": Could not open bitmap file %s.\n",
 438                                         match->bitmap_file);
 439                                 close(mdfd);
 440                                 return 1;
 441                         }
 442                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 443                                 close(bmfd);
 444                                 fprintf(stderr, Name
 445                                         ": Failed to set bitmapfile for %s.\n",
 446                                         chosen_name);
 447                                 close(mdfd);
 448                                 return 1;
 449                         }
 450                         close(bmfd);
 451                 }
 452                 sra = sysfs_read(mdfd, fd2devnum(mdfd), 0);
 453                 if ((sra == NULL || active_disks >= info.array.working_disks)
 454                     && trustworthy != FOREIGN)
 455                         rv = ioctl(mdfd, RUN_ARRAY, NULL);
 456                 else
 457                         rv = sysfs_set_str(sra, NULL,
 458                                            "array_state", "read-auto");
 459                 if (rv == 0) {
 460                         if (verbose >= 0)
 461                                 fprintf(stderr, Name
 462                            ": %s attached to %s, which has been started.\n",
 463                                         devname, chosen_name);
 464                         rv = 0;
 465                         wait_for(chosen_name);
 466                 } else {
 467                         fprintf(stderr, Name
 468                              ": %s attached to %s, but failed to start: %s.\n",
 469                                 devname, chosen_name, strerror(errno));
 470                         rv = 1;
 471                 }
 472         } else {
 473                 if (verbose >= 0)
 474                         fprintf(stderr, Name
 475                           ": %s attached to %s, not enough to start safely.\n",
 476                                 devname, chosen_name);
 477                 rv = 0;
 478         }
 479         close(mdfd);
 480         return rv;
 481 }
 482
 483 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
 484                         int number, __u64 events, int verbose,
 485                         char *array_name)
 486 {
 487         /* Find a device attached to this array with a disk.number of number
 488          * and events less than the passed events, and remove the device.
 489          */
 490         struct mdinfo *d;
 491         mdu_array_info_t ra;
 492
 493         if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
 494                 return; /* not safe to remove from active arrays
 495                          * without thinking more */
 496
 497         for (d = sra->devs; d ; d = d->next) {
 498                 char dn[10];
 499                 int dfd;
 500                 struct mdinfo info;
 501                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 502                 dfd = dev_open(dn, O_RDONLY);
 503                 if (dfd < 0)
 504                         continue;
 505                 if (st->ss->load_super(st, dfd, NULL)) {
 506                         close(dfd);
 507                         continue;
 508                 }
 509                 st->ss->getinfo_super(st, &info);
 510                 st->ss->free_super(st);
 511                 close(dfd);
 512
 513                 if (info.disk.number != number ||
 514                     info.events >= events)
 515                         continue;
 516
 517                 if (d->disk.raid_disk > -1)
 518                         sysfs_set_str(sra, d, "slot", "none");
 519                 if (sysfs_set_str(sra, d, "state", "remove") == 0)
 520                         if (verbose >= 0)
 521                                 fprintf(stderr, Name
 522                                         ": removing old device %s from %s\n",
 523                                         d->sys_name+4, array_name);
 524         }
 525 }
 526
 527 static int count_active(struct supertype *st, int mdfd, char **availp,
 528                         struct mdinfo *bestinfo)
 529 {
 530         /* count how many devices in sra think they are active */
 531         struct mdinfo *d;
 532         int cnt = 0, cnt1 = 0;
 533         __u64 max_events = 0;
 534         struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
 535         char *avail = NULL;
 536
 537         for (d = sra->devs ; d ; d = d->next) {
 538                 char dn[30];
 539                 int dfd;
 540                 int ok;
 541                 struct mdinfo info;
 542
 543                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 544                 dfd = dev_open(dn, O_RDONLY);
 545                 if (dfd < 0)
 546                         continue;
 547                 ok =  st->ss->load_super(st, dfd, NULL);
 548                 close(dfd);
 549                 if (ok != 0)
 550                         continue;
 551                 st->ss->getinfo_super(st, &info);
 552                 if (!avail) {
 553                         avail = malloc(info.array.raid_disks);
 554                         if (!avail) {
 555                                 fprintf(stderr, Name ": out of memory.\n");
 556                                 exit(1);
 557                         }
 558                         memset(avail, 0, info.array.raid_disks);
 559                         *availp = avail;
 560                 }
 561
 562                 if (info.disk.state & (1<<MD_DISK_SYNC))
 563                 {
 564                         if (cnt == 0) {
 565                                 cnt++;
 566                                 max_events = info.events;
 567                                 avail[info.disk.raid_disk] = 2;
 568                                 st->ss->getinfo_super(st, bestinfo);
 569                         } else if (info.events == max_events) {
 570                                 cnt++;
 571                                 avail[info.disk.raid_disk] = 2;
 572                         } else if (info.events == max_events-1) {
 573                                 cnt1++;
 574                                 avail[info.disk.raid_disk] = 1;
 575                         } else if (info.events < max_events - 1)
 576                                 ;
 577                         else if (info.events == max_events+1) {
 578                                 int i;
 579                                 cnt1 = cnt;
 580                                 cnt = 1;
 581                                 max_events = info.events;
 582                                 for (i=0; i<info.array.raid_disks; i++)
 583                                         if (avail[i])
 584                                                 avail[i]--;
 585                                 avail[info.disk.raid_disk] = 2;
 586                                 st->ss->getinfo_super(st, bestinfo);
 587                         } else { /* info.events much bigger */
 588                                 cnt = 1; cnt1 = 0;
 589                                 memset(avail, 0, info.disk.raid_disk);
 590                                 max_events = info.events;
 591                                 st->ss->getinfo_super(st, bestinfo);
 592                         }
 593                 }
 594                 st->ss->free_super(st);
 595         }
 596         return cnt + cnt1;
 597 }
 598
 599 int IncrementalScan(int verbose)
 600 {
 601         /* look at every device listed in the 'map' file.
 602          * If one is found that is not running then:
 603          *  look in mdadm.conf for bitmap file.
 604          *   if one exists, but array has none, add it.
 605          *  try to start array in auto-readonly mode
 606          */
 607         struct map_ent *mapl = NULL;
 608         struct map_ent *me;
 609         mddev_ident_t devs, mddev;
 610         int rv = 0;
 611
 612         map_read(&mapl);
 613         devs = conf_get_ident(NULL);
 614
 615         for (me = mapl ; me ; me = me->next) {
 616                 mdu_array_info_t array;
 617                 mdu_bitmap_file_t bmf;
 618                 struct mdinfo *sra;
 619                 int mdfd = open_mddev(me->path, 0);
 620
 621                 if (mdfd < 0)
 622                         continue;
 623                 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
 624                     errno != ENODEV) {
 625                         close(mdfd);
 626                         continue;
 627                 }
 628                 /* Ok, we can try this one.   Maybe it needs a bitmap */
 629                 for (mddev = devs ; mddev ; mddev = mddev->next)
 630                         if (mddev->devname
 631                             && strcmp(mddev->devname, me->path) == 0)
 632                                 break;
 633                 if (mddev && mddev->bitmap_file) {
 634                         /*
 635                          * Note: early kernels will wrongly fail this, so it
 636                          * is a hint only
 637                          */
 638                         int added = -1;
 639                         if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
 640                                 int bmfd = open(mddev->bitmap_file, O_RDWR);
 641                                 if (bmfd >= 0) {
 642                                         added = ioctl(mdfd, SET_BITMAP_FILE,
 643                                                       bmfd);
 644                                         close(bmfd);
 645                                 }
 646                         }
 647                         if (verbose >= 0) {
 648                                 if (added == 0)
 649                                         fprintf(stderr, Name
 650                                                 ": Added bitmap %s to %s\n",
 651                                                 mddev->bitmap_file, me->path);
 652                                 else if (errno != EEXIST)
 653                                         fprintf(stderr, Name
 654                                            ": Failed to add bitmap to %s: %s\n",
 655                                                 me->path, strerror(errno));
 656                         }
 657                 }
 658                 sra = sysfs_read(mdfd, 0, 0);
 659                 if (sra) {
 660                         if (sysfs_set_str(sra, NULL,
 661                                           "array_state", "read-auto") == 0) {
 662                                 if (verbose >= 0)
 663                                         fprintf(stderr, Name
 664                                                 ": started array %s\n",
 665                                                 me->path);
 666                         } else {
 667                                 fprintf(stderr, Name
 668                                         ": failed to start array %s: %s\n",
 669                                         me->path, strerror(errno));
 670                                 rv = 1;
 671                         }
 672                 }
 673         }
 674         return rv;
 675 }
 676
 677 static char *container2devname(char *devname)
 678 {
 679         char *mdname = NULL;
 680
 681         if (devname[0] == '/') {
 682                 int fd = open(devname, O_RDONLY);
 683                 if (fd >= 0) {
 684                         mdname = devnum2devname(fd2devnum(fd));
 685                         close(fd);
 686                 }
 687         } else {
 688                 int uuid[4];
 689                 struct map_ent *mp, *map = NULL;
 690
 691                 if (!parse_uuid(devname, uuid))
 692                         return mdname;
 693                 mp = map_by_uuid(&map, uuid);
 694                 if (mp)
 695                         mdname = devnum2devname(mp->devnum);
 696                 map_free(map);
 697         }
 698
 699         return mdname;
 700 }
 701
 702 int Incremental_container(struct supertype *st, char *devname, int verbose,
 703                           int runstop, int autof, int trustworthy)
 704 {
 705         /* Collect the contents of this container and for each
 706          * array, choose a device name and assemble the array.
 707          */
 708
 709         struct mdinfo *list = st->ss->container_content(st);
 710         struct mdinfo *ra;
 711         struct map_ent *map = NULL;
 712
 713         map_lock(&map);
 714
 715         for (ra = list ; ra ; ra = ra->next) {
 716                 int mdfd;
 717                 char chosen_name[1024];
 718                 struct map_ent *mp;
 719                 struct mddev_ident_s *match = NULL;
 720                 int err;
 721
 722                 mp = map_by_uuid(&map, ra->uuid);
 723
 724                 if (!mp) {
 725
 726                         /* Check in mdadm.conf for devices == devname and
 727                          * member == ra->text_version after second slash.
 728                          */
 729                         char *sub = strchr(ra->text_version+1, '/');
 730                         struct mddev_ident_s *array_list;
 731                         if (sub) {
 732                                 sub++;
 733                                 array_list = conf_get_ident(NULL);
 734                         } else
 735                                 array_list = NULL;
 736                         for(; array_list ; array_list = array_list->next) {
 737                                 char *dn;
 738                                 if (array_list->member == NULL ||
 739                                     array_list->container == NULL)
 740                                         continue;
 741                                 if (strcmp(array_list->member, sub) != 0)
 742                                         continue;
 743                                 if (array_list->uuid_set &&
 744                                     !same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
 745                                         continue;
 746                                 dn = container2devname(array_list->container);
 747                                 if (dn == NULL)
 748                                         continue;
 749                                 if (strncmp(dn, ra->text_version+1,
 750                                             strlen(dn)) != 0 ||
 751                                     ra->text_version[strlen(dn)+1] != '/') {
 752                                         free(dn);
 753                                         continue;
 754                                 }
 755                                 free(dn);
 756                                 /* we have a match */
 757                                 match = array_list;
 758                                 if (verbose>0)
 759                                         fprintf(stderr, Name ": match found for member %s\n",
 760                                                 array_list->member);
 761                                 break;
 762                         }
 763                 }
 764
 765                 mdfd = create_mddev(match ? match->devname : NULL,
 766                                     ra->name,
 767                                     autof,
 768                                     trustworthy,
 769                                     chosen_name);
 770
 771                 if (mdfd < 0) {
 772                         fprintf(stderr, Name ": failed to open %s: %s.\n",
 773                                 chosen_name, strerror(errno));
 774                         return 2;
 775                 }
 776
 777                 err = assemble_container_content(st, mdfd, ra, runstop,
 778                                                  chosen_name, verbose);
 779                 if (err)
 780                         return err;
 781         }
 782         map_unlock(&map);
 783         return 0;
 784 }