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