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         else
 224                 trustworthy = LOCAL;
 225
 226         /* There are three possible sources for 'autof':  command line,
 227          * ARRAY line in mdadm.conf, or CREATE line in mdadm.conf.
 228          * ARRAY takes precedence, then command line, then
 229          * CREATE.
 230          */
 231         if (match && match->autof)
 232                 autof = match->autof;
 233         if (autof == 0)
 234                 autof = ci->autof;
 235
 236         if (st->ss->container_content && st->loaded_container) {
 237                 /* This is a pre-built container array, so we do something
 238                  * rather different.
 239                  */
 240                 return Incremental_container(st, devname, verbose, runstop,
 241                                              autof, trustworthy);
 242         }
 243         name_to_use = strchr(info.name, ':');
 244         if (name_to_use)
 245                 name_to_use++;
 246         else
 247                 name_to_use = info.name;
 248
 249         if ((!name_to_use || name_to_use[0] == 0) &&
 250             info.array.level == LEVEL_CONTAINER &&
 251             trustworthy == LOCAL) {
 252                 name_to_use = info.text_version;
 253                 trustworthy = METADATA;
 254         }
 255
 256         /* 4/ Check if array exists.
 257          */
 258         map_lock(&map);
 259         mp = map_by_uuid(&map, info.uuid);
 260         if (mp) {
 261                 mdfd = open_mddev(mp->path, 0);
 262                 if (mdfd < 0 && mddev_busy(mp->devnum)) {
 263                         /* maybe udev hasn't created it yet. */
 264                         char buf[50];
 265                         sprintf(buf, "%d:%d", dev2major(mp->devnum),
 266                                 dev2minor(mp->devnum));
 267                         mdfd = dev_open(buf, O_RDWR);
 268                 }
 269         } else
 270                 mdfd = -1;
 271
 272         if (mdfd < 0) {
 273                 struct mdinfo *sra;
 274                 struct mdinfo dinfo;
 275
 276                 /* Couldn't find an existing array, maybe make a new one */
 277                 mdfd = create_mddev(match ? match->devname : NULL,
 278                                     name_to_use, autof, trustworthy, chosen_name);
 279
 280                 if (mdfd < 0)
 281                         return 1;
 282
 283                 sysfs_init(&info, mdfd, 0);
 284
 285                 if (set_array_info(mdfd, st, &info) != 0) {
 286                         fprintf(stderr, Name ": failed to set array info for %s: %s\n",
 287                                 chosen_name, strerror(errno));
 288                         close(mdfd);
 289                         return 2;
 290                 }
 291
 292                 dinfo = info;
 293                 dinfo.disk.major = major(stb.st_rdev);
 294                 dinfo.disk.minor = minor(stb.st_rdev);
 295                 if (add_disk(mdfd, st, &info, &dinfo) != 0) {
 296                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 297                                 devname, chosen_name, strerror(errno));
 298                         ioctl(mdfd, STOP_ARRAY, 0);
 299                         close(mdfd);
 300                         return 2;
 301                 }
 302                 sra = sysfs_read(mdfd, fd2devnum(mdfd), GET_DEVS);
 303                 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
 304                         /* It really should be 'none' - must be old buggy
 305                          * kernel, and mdadm -I may not be able to complete.
 306                          * So reject it.
 307                          */
 308                         ioctl(mdfd, STOP_ARRAY, NULL);
 309                         fprintf(stderr, Name
 310                       ": You have an old buggy kernel which cannot support\n"
 311                                 "      --incremental reliably.  Aborting.\n");
 312                         close(mdfd);
 313                         sysfs_free(sra);
 314                         return 2;
 315                 }
 316                 info.array.working_disks = 1;
 317                 sysfs_free(sra);
 318                 /* 6/ Make sure /var/run/mdadm.map contains this array. */
 319                 map_update(&map, fd2devnum(mdfd),
 320                            info.text_version,
 321                            info.uuid, chosen_name);
 322         } else {
 323         /* 5b/ if it does */
 324         /* - check one drive in array to make sure metadata is a reasonably */
 325         /*        close match.  Reject if not (e.g. different type) */
 326         /* - add the device */
 327                 char dn[20];
 328                 int dfd2;
 329                 int err;
 330                 struct mdinfo *sra;
 331                 struct supertype *st2;
 332                 struct mdinfo info2, *d;
 333
 334                 strcpy(chosen_name, mp->path);
 335
 336                 sra = sysfs_read(mdfd, fd2devnum(mdfd), (GET_DEVS | GET_STATE));
 337
 338                 sprintf(dn, "%d:%d", sra->devs->disk.major,
 339                         sra->devs->disk.minor);
 340                 dfd2 = dev_open(dn, O_RDONLY);
 341                 st2 = dup_super(st);
 342                 if (st2->ss->load_super(st2, dfd2, NULL) ||
 343                     st->ss->compare_super(st, st2) != 0) {
 344                         fprintf(stderr, Name
 345                                 ": metadata mismatch between %s and "
 346                                 "chosen array %s\n",
 347                                 devname, chosen_name);
 348                         close(mdfd);
 349                         close(dfd2);
 350                         return 2;
 351                 }
 352                 close(dfd2);
 353                 memset(&info2, 0, sizeof(info2));
 354                 st2->ss->getinfo_super(st2, &info2);
 355                 st2->ss->free_super(st2);
 356                 if (info.array.level != info2.array.level ||
 357                     memcmp(info.uuid, info2.uuid, 16) != 0 ||
 358                     info.array.raid_disks != info2.array.raid_disks) {
 359                         fprintf(stderr, Name
 360                                 ": unexpected difference between %s and %s.\n",
 361                                 chosen_name, devname);
 362                         close(mdfd);
 363                         return 2;
 364                 }
 365                 info2.disk.major = major(stb.st_rdev);
 366                 info2.disk.minor = minor(stb.st_rdev);
 367                 /* add disk needs to know about containers */
 368                 if (st->ss->external)
 369                         sra->array.level = LEVEL_CONTAINER;
 370                 err = add_disk(mdfd, st2, sra, &info2);
 371                 if (err < 0 && errno == EBUSY) {
 372                         /* could be another device present with the same
 373                          * disk.number. Find and reject any such
 374                          */
 375                         find_reject(mdfd, st, sra, info.disk.number,
 376                                     info.events, verbose, chosen_name);
 377                         err = add_disk(mdfd, st2, sra, &info2);
 378                 }
 379                 if (err < 0) {
 380                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 381                                 devname, chosen_name, strerror(errno));
 382                         close(mdfd);
 383                         return 2;
 384                 }
 385                 info.array.working_disks = 0;
 386                 for (d = sra->devs; d; d=d->next)
 387                         info.array.working_disks ++;
 388
 389         }
 390
 391         /* 7/ Is there enough devices to possibly start the array? */
 392         /* 7a/ if not, finish with success. */
 393         if (info.array.level == LEVEL_CONTAINER) {
 394                 /* Try to assemble within the container */
 395                 map_unlock(&map);
 396                 sysfs_uevent(&info, "change");
 397                 if (verbose >= 0)
 398                         fprintf(stderr, Name
 399                                 ": container %s now has %d devices\n",
 400                                 chosen_name, info.array.working_disks);
 401                 wait_for(chosen_name, mdfd);
 402                 close(mdfd);
 403                 if (runstop < 0)
 404                         return 0; /* don't try to assemble */
 405                 return Incremental(chosen_name, verbose, runstop,
 406                                    NULL, homehost, autof);
 407         }
 408         avail = NULL;
 409         active_disks = count_active(st, mdfd, &avail, &info);
 410         if (enough(info.array.level, info.array.raid_disks,
 411                    info.array.layout, info.array.state & 1,
 412                    avail, active_disks) == 0 ||
 413             (runstop < 0 && active_disks < info.array.raid_disks)) {
 414                 free(avail);
 415                 if (verbose >= 0)
 416                         fprintf(stderr, Name
 417                              ": %s attached to %s, not enough to start (%d).\n",
 418                                 devname, chosen_name, active_disks);
 419                 map_unlock(&map);
 420                 close(mdfd);
 421                 return 0;
 422         }
 423         free(avail);
 424
 425         /* 7b/ if yes, */
 426         /* - if number of OK devices match expected, or -R and there */
 427         /*             are enough, */
 428         /*   + add any bitmap file  */
 429         /*   + start the array (auto-readonly). */
 430
 431         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 432                 if (verbose >= 0)
 433                         fprintf(stderr, Name
 434                            ": %s attached to %s which is already active.\n",
 435                                 devname, chosen_name);
 436                 close(mdfd);
 437                 map_unlock(&map);
 438                 return 0;
 439         }
 440
 441         map_unlock(&map);
 442         if (runstop > 0 || active_disks >= info.array.working_disks) {
 443                 struct mdinfo *sra;
 444                 /* Let's try to start it */
 445                 if (match && match->bitmap_file) {
 446                         int bmfd = open(match->bitmap_file, O_RDWR);
 447                         if (bmfd < 0) {
 448                                 fprintf(stderr, Name
 449                                         ": Could not open bitmap file %s.\n",
 450                                         match->bitmap_file);
 451                                 close(mdfd);
 452                                 return 1;
 453                         }
 454                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 455                                 close(bmfd);
 456                                 fprintf(stderr, Name
 457                                         ": Failed to set bitmapfile for %s.\n",
 458                                         chosen_name);
 459                                 close(mdfd);
 460                                 return 1;
 461                         }
 462                         close(bmfd);
 463                 }
 464                 sra = sysfs_read(mdfd, fd2devnum(mdfd), 0);
 465                 if ((sra == NULL || active_disks >= info.array.working_disks)
 466                     && trustworthy != FOREIGN)
 467                         rv = ioctl(mdfd, RUN_ARRAY, NULL);
 468                 else
 469                         rv = sysfs_set_str(sra, NULL,
 470                                            "array_state", "read-auto");
 471                 if (rv == 0) {
 472                         if (verbose >= 0)
 473                                 fprintf(stderr, Name
 474                            ": %s attached to %s, which has been started.\n",
 475                                         devname, chosen_name);
 476                         rv = 0;
 477                         wait_for(chosen_name, mdfd);
 478                 } else {
 479                         fprintf(stderr, Name
 480                              ": %s attached to %s, but failed to start: %s.\n",
 481                                 devname, chosen_name, strerror(errno));
 482                         rv = 1;
 483                 }
 484         } else {
 485                 if (verbose >= 0)
 486                         fprintf(stderr, Name
 487                           ": %s attached to %s, not enough to start safely.\n",
 488                                 devname, chosen_name);
 489                 rv = 0;
 490         }
 491         close(mdfd);
 492         return rv;
 493 }
 494
 495 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
 496                         int number, __u64 events, int verbose,
 497                         char *array_name)
 498 {
 499         /* Find a device attached to this array with a disk.number of number
 500          * and events less than the passed events, and remove the device.
 501          */
 502         struct mdinfo *d;
 503         mdu_array_info_t ra;
 504
 505         if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
 506                 return; /* not safe to remove from active arrays
 507                          * without thinking more */
 508
 509         for (d = sra->devs; d ; d = d->next) {
 510                 char dn[10];
 511                 int dfd;
 512                 struct mdinfo info;
 513                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 514                 dfd = dev_open(dn, O_RDONLY);
 515                 if (dfd < 0)
 516                         continue;
 517                 if (st->ss->load_super(st, dfd, NULL)) {
 518                         close(dfd);
 519                         continue;
 520                 }
 521                 st->ss->getinfo_super(st, &info);
 522                 st->ss->free_super(st);
 523                 close(dfd);
 524
 525                 if (info.disk.number != number ||
 526                     info.events >= events)
 527                         continue;
 528
 529                 if (d->disk.raid_disk > -1)
 530                         sysfs_set_str(sra, d, "slot", "none");
 531                 if (sysfs_set_str(sra, d, "state", "remove") == 0)
 532                         if (verbose >= 0)
 533                                 fprintf(stderr, Name
 534                                         ": removing old device %s from %s\n",
 535                                         d->sys_name+4, array_name);
 536         }
 537 }
 538
 539 static int count_active(struct supertype *st, int mdfd, char **availp,
 540                         struct mdinfo *bestinfo)
 541 {
 542         /* count how many devices in sra think they are active */
 543         struct mdinfo *d;
 544         int cnt = 0, cnt1 = 0;
 545         __u64 max_events = 0;
 546         struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
 547         char *avail = NULL;
 548
 549         for (d = sra->devs ; d ; d = d->next) {
 550                 char dn[30];
 551                 int dfd;
 552                 int ok;
 553                 struct mdinfo info;
 554
 555                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 556                 dfd = dev_open(dn, O_RDONLY);
 557                 if (dfd < 0)
 558                         continue;
 559                 ok =  st->ss->load_super(st, dfd, NULL);
 560                 close(dfd);
 561                 if (ok != 0)
 562                         continue;
 563                 st->ss->getinfo_super(st, &info);
 564                 if (!avail) {
 565                         avail = malloc(info.array.raid_disks);
 566                         if (!avail) {
 567                                 fprintf(stderr, Name ": out of memory.\n");
 568                                 exit(1);
 569                         }
 570                         memset(avail, 0, info.array.raid_disks);
 571                         *availp = avail;
 572                 }
 573
 574                 if (info.disk.state & (1<<MD_DISK_SYNC))
 575                 {
 576                         if (cnt == 0) {
 577                                 cnt++;
 578                                 max_events = info.events;
 579                                 avail[info.disk.raid_disk] = 2;
 580                                 st->ss->getinfo_super(st, bestinfo);
 581                         } else if (info.events == max_events) {
 582                                 cnt++;
 583                                 avail[info.disk.raid_disk] = 2;
 584                         } else if (info.events == max_events-1) {
 585                                 cnt1++;
 586                                 avail[info.disk.raid_disk] = 1;
 587                         } else if (info.events < max_events - 1)
 588                                 ;
 589                         else if (info.events == max_events+1) {
 590                                 int i;
 591                                 cnt1 = cnt;
 592                                 cnt = 1;
 593                                 max_events = info.events;
 594                                 for (i=0; i<info.array.raid_disks; i++)
 595                                         if (avail[i])
 596                                                 avail[i]--;
 597                                 avail[info.disk.raid_disk] = 2;
 598                                 st->ss->getinfo_super(st, bestinfo);
 599                         } else { /* info.events much bigger */
 600                                 cnt = 1; cnt1 = 0;
 601                                 memset(avail, 0, info.disk.raid_disk);
 602                                 max_events = info.events;
 603                                 st->ss->getinfo_super(st, bestinfo);
 604                         }
 605                 }
 606                 st->ss->free_super(st);
 607         }
 608         return cnt + cnt1;
 609 }
 610
 611 int IncrementalScan(int verbose)
 612 {
 613         /* look at every device listed in the 'map' file.
 614          * If one is found that is not running then:
 615          *  look in mdadm.conf for bitmap file.
 616          *   if one exists, but array has none, add it.
 617          *  try to start array in auto-readonly mode
 618          */
 619         struct map_ent *mapl = NULL;
 620         struct map_ent *me;
 621         mddev_ident_t devs, mddev;
 622         int rv = 0;
 623
 624         map_read(&mapl);
 625         devs = conf_get_ident(NULL);
 626
 627         for (me = mapl ; me ; me = me->next) {
 628                 mdu_array_info_t array;
 629                 mdu_bitmap_file_t bmf;
 630                 struct mdinfo *sra;
 631                 int mdfd = open_mddev(me->path, 0);
 632
 633                 if (mdfd < 0)
 634                         continue;
 635                 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
 636                     errno != ENODEV) {
 637                         close(mdfd);
 638                         continue;
 639                 }
 640                 /* Ok, we can try this one.   Maybe it needs a bitmap */
 641                 for (mddev = devs ; mddev ; mddev = mddev->next)
 642                         if (mddev->devname
 643                             && strcmp(mddev->devname, me->path) == 0)
 644                                 break;
 645                 if (mddev && mddev->bitmap_file) {
 646                         /*
 647                          * Note: early kernels will wrongly fail this, so it
 648                          * is a hint only
 649                          */
 650                         int added = -1;
 651                         if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
 652                                 int bmfd = open(mddev->bitmap_file, O_RDWR);
 653                                 if (bmfd >= 0) {
 654                                         added = ioctl(mdfd, SET_BITMAP_FILE,
 655                                                       bmfd);
 656                                         close(bmfd);
 657                                 }
 658                         }
 659                         if (verbose >= 0) {
 660                                 if (added == 0)
 661                                         fprintf(stderr, Name
 662                                                 ": Added bitmap %s to %s\n",
 663                                                 mddev->bitmap_file, me->path);
 664                                 else if (errno != EEXIST)
 665                                         fprintf(stderr, Name
 666                                            ": Failed to add bitmap to %s: %s\n",
 667                                                 me->path, strerror(errno));
 668                         }
 669                 }
 670                 sra = sysfs_read(mdfd, 0, 0);
 671                 if (sra) {
 672                         if (sysfs_set_str(sra, NULL,
 673                                           "array_state", "read-auto") == 0) {
 674                                 if (verbose >= 0)
 675                                         fprintf(stderr, Name
 676                                                 ": started array %s\n",
 677                                                 me->path);
 678                         } else {
 679                                 fprintf(stderr, Name
 680                                         ": failed to start array %s: %s\n",
 681                                         me->path, strerror(errno));
 682                                 rv = 1;
 683                         }
 684                 }
 685         }
 686         return rv;
 687 }
 688
 689 static char *container2devname(char *devname)
 690 {
 691         char *mdname = NULL;
 692
 693         if (devname[0] == '/') {
 694                 int fd = open(devname, O_RDONLY);
 695                 if (fd >= 0) {
 696                         mdname = devnum2devname(fd2devnum(fd));
 697                         close(fd);
 698                 }
 699         } else {
 700                 int uuid[4];
 701                 struct map_ent *mp, *map = NULL;
 702
 703                 if (!parse_uuid(devname, uuid))
 704                         return mdname;
 705                 mp = map_by_uuid(&map, uuid);
 706                 if (mp)
 707                         mdname = devnum2devname(mp->devnum);
 708                 map_free(map);
 709         }
 710
 711         return mdname;
 712 }
 713
 714 int Incremental_container(struct supertype *st, char *devname, int verbose,
 715                           int runstop, int autof, int trustworthy)
 716 {
 717         /* Collect the contents of this container and for each
 718          * array, choose a device name and assemble the array.
 719          */
 720
 721         struct mdinfo *list = st->ss->container_content(st);
 722         struct mdinfo *ra;
 723         struct map_ent *map = NULL;
 724
 725         map_lock(&map);
 726
 727         for (ra = list ; ra ; ra = ra->next) {
 728                 int mdfd;
 729                 char chosen_name[1024];
 730                 struct map_ent *mp;
 731                 struct mddev_ident_s *match = NULL;
 732                 int err;
 733
 734                 mp = map_by_uuid(&map, ra->uuid);
 735
 736                 if (mp) {
 737                         mdfd = open_dev(mp->devnum);
 738                         strcpy(chosen_name, mp->path);
 739                 } else {
 740
 741                         /* Check in mdadm.conf for devices == devname and
 742                          * member == ra->text_version after second slash.
 743                          */
 744                         char *sub = strchr(ra->text_version+1, '/');
 745                         struct mddev_ident_s *array_list;
 746                         if (sub) {
 747                                 sub++;
 748                                 array_list = conf_get_ident(NULL);
 749                         } else
 750                                 array_list = NULL;
 751                         for(; array_list ; array_list = array_list->next) {
 752                                 char *dn;
 753                                 if (array_list->member == NULL ||
 754                                     array_list->container == NULL)
 755                                         continue;
 756                                 if (strcmp(array_list->member, sub) != 0)
 757                                         continue;
 758                                 if (array_list->uuid_set &&
 759                                     !same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
 760                                         continue;
 761                                 dn = container2devname(array_list->container);
 762                                 if (dn == NULL)
 763                                         continue;
 764                                 if (strncmp(dn, ra->text_version+1,
 765                                             strlen(dn)) != 0 ||
 766                                     ra->text_version[strlen(dn)+1] != '/') {
 767                                         free(dn);
 768                                         continue;
 769                                 }
 770                                 free(dn);
 771                                 /* we have a match */
 772                                 match = array_list;
 773                                 if (verbose>0)
 774                                         fprintf(stderr, Name ": match found for member %s\n",
 775                                                 array_list->member);
 776                                 break;
 777                         }
 778
 779                         mdfd = create_mddev(match ? match->devname : NULL,
 780                                             ra->name,
 781                                             autof,
 782                                             trustworthy,
 783                                             chosen_name);
 784                 }
 785
 786                 if (mdfd < 0) {
 787                         fprintf(stderr, Name ": failed to open %s: %s.\n",
 788                                 chosen_name, strerror(errno));
 789                         return 2;
 790                 }
 791
 792                 err = assemble_container_content(st, mdfd, ra, runstop,
 793                                                  chosen_name, verbose);
 794                 if (err)
 795                         return err;
 796         }
 797         map_unlock(&map);
 798         return 0;
 799 }