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         else
 253                 mdfd = -1;
 254
 255         if (mdfd < 0) {
 256                 struct mdinfo *sra;
 257                 struct mdinfo dinfo;
 258
 259                 /* Couldn't find an existing array, maybe make a new one */
 260                 mdfd = create_mddev(mp ? mp->path : match ? match->devname : NULL,
 261                                     info.name, autof, trustworthy, chosen_name);
 262
 263
 264                 if (mdfd < 0)
 265                         return 1;
 266
 267                 sysfs_init(&info, mdfd, 0);
 268
 269                 if (set_array_info(mdfd, st, &info) != 0) {
 270                         fprintf(stderr, Name ": failed to set array info for %s: %s\n",
 271                                 chosen_name, strerror(errno));
 272                         close(mdfd);
 273                         return 2;
 274                 }
 275
 276                 dinfo = info;
 277                 dinfo.disk.major = major(stb.st_rdev);
 278                 dinfo.disk.minor = minor(stb.st_rdev);
 279                 if (add_disk(mdfd, st, &info, &dinfo) != 0) {
 280                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 281                                 devname, chosen_name, strerror(errno));
 282                         ioctl(mdfd, STOP_ARRAY, 0);
 283                         close(mdfd);
 284                         return 2;
 285                 }
 286                 sra = sysfs_read(mdfd, fd2devnum(mdfd), GET_DEVS);
 287                 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
 288                         /* It really should be 'none' - must be old buggy
 289                          * kernel, and mdadm -I may not be able to complete.
 290                          * So reject it.
 291                          */
 292                         ioctl(mdfd, STOP_ARRAY, NULL);
 293                         fprintf(stderr, Name
 294                       ": You have an old buggy kernel which cannot support\n"
 295                                 "      --incremental reliably.  Aborting.\n");
 296                         close(mdfd);
 297                         sysfs_free(sra);
 298                         return 2;
 299                 }
 300                 info.array.working_disks = 1;
 301                 sysfs_free(sra);
 302                 /* 6/ Make sure /var/run/mdadm.map contains this array. */
 303                 map_update(&map, fd2devnum(mdfd),
 304                            info.text_version,
 305                            info.uuid, chosen_name);
 306         } else {
 307         /* 5b/ if it does */
 308         /* - check one drive in array to make sure metadata is a reasonably */
 309         /*        close match.  Reject if not (e.g. different type) */
 310         /* - add the device */
 311                 char dn[20];
 312                 int dfd2;
 313                 int err;
 314                 struct mdinfo *sra;
 315                 struct supertype *st2;
 316                 struct mdinfo info2, *d;
 317
 318                 strcpy(chosen_name, mp->path);
 319
 320                 sra = sysfs_read(mdfd, fd2devnum(mdfd), (GET_DEVS | GET_STATE));
 321
 322                 sprintf(dn, "%d:%d", sra->devs->disk.major,
 323                         sra->devs->disk.minor);
 324                 dfd2 = dev_open(dn, O_RDONLY);
 325                 st2 = dup_super(st);
 326                 if (st2->ss->load_super(st2, dfd2, NULL) ||
 327                     st->ss->compare_super(st, st2) != 0) {
 328                         fprintf(stderr, Name
 329                                 ": metadata mismatch between %s and "
 330                                 "chosen array %s\n",
 331                                 devname, chosen_name);
 332                         close(mdfd);
 333                         close(dfd2);
 334                         return 2;
 335                 }
 336                 close(dfd2);
 337                 memset(&info2, 0, sizeof(info2));
 338                 st2->ss->getinfo_super(st2, &info2);
 339                 st2->ss->free_super(st2);
 340                 if (info.array.level != info2.array.level ||
 341                     memcmp(info.uuid, info2.uuid, 16) != 0 ||
 342                     info.array.raid_disks != info2.array.raid_disks) {
 343                         fprintf(stderr, Name
 344                                 ": unexpected difference between %s and %s.\n",
 345                                 chosen_name, devname);
 346                         close(mdfd);
 347                         return 2;
 348                 }
 349                 info2.disk.major = major(stb.st_rdev);
 350                 info2.disk.minor = minor(stb.st_rdev);
 351                 /* add disk needs to know about containers */
 352                 if (st->ss->external)
 353                         sra->array.level = LEVEL_CONTAINER;
 354                 err = add_disk(mdfd, st2, sra, &info2);
 355                 if (err < 0 && errno == EBUSY) {
 356                         /* could be another device present with the same
 357                          * disk.number. Find and reject any such
 358                          */
 359                         find_reject(mdfd, st, sra, info.disk.number,
 360                                     info.events, verbose, chosen_name);
 361                         err = add_disk(mdfd, st2, sra, &info2);
 362                 }
 363                 if (err < 0) {
 364                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 365                                 devname, chosen_name, strerror(errno));
 366                         close(mdfd);
 367                         return 2;
 368                 }
 369                 info.array.working_disks = 0;
 370                 for (d = sra->devs; d; d=d->next)
 371                         info.array.working_disks ++;
 372
 373         }
 374
 375         /* 7/ Is there enough devices to possibly start the array? */
 376         /* 7a/ if not, finish with success. */
 377         if (info.array.level == LEVEL_CONTAINER) {
 378                 /* Try to assemble within the container */
 379                 close(mdfd);
 380                 map_unlock(&map);
 381                 sysfs_uevent(&info, "change");
 382                 if (verbose >= 0)
 383                         fprintf(stderr, Name
 384                                 ": container %s now has %d devices\n",
 385                                 chosen_name, info.array.working_disks);
 386                 return Incremental(chosen_name, verbose, runstop,
 387                                    NULL, homehost, autof);
 388         }
 389         avail = NULL;
 390         active_disks = count_active(st, mdfd, &avail, &info);
 391         if (enough(info.array.level, info.array.raid_disks,
 392                    info.array.layout, info.array.state & 1,
 393                    avail, active_disks) == 0) {
 394                 free(avail);
 395                 if (verbose >= 0)
 396                         fprintf(stderr, Name
 397                              ": %s attached to %s, not enough to start (%d).\n",
 398                                 devname, chosen_name, active_disks);
 399                 map_unlock(&map);
 400                 close(mdfd);
 401                 return 0;
 402         }
 403         free(avail);
 404
 405         /* 7b/ if yes, */
 406         /* - if number of OK devices match expected, or -R and there */
 407         /*             are enough, */
 408         /*   + add any bitmap file  */
 409         /*   + start the array (auto-readonly). */
 410
 411         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 412                 if (verbose >= 0)
 413                         fprintf(stderr, Name
 414                            ": %s attached to %s which is already active.\n",
 415                                 devname, chosen_name);
 416                 close(mdfd);
 417                 map_unlock(&map);
 418                 return 0;
 419         }
 420
 421         map_unlock(&map);
 422         if (runstop > 0 || active_disks >= info.array.working_disks) {
 423                 struct mdinfo *sra;
 424                 /* Let's try to start it */
 425                 if (match && match->bitmap_file) {
 426                         int bmfd = open(match->bitmap_file, O_RDWR);
 427                         if (bmfd < 0) {
 428                                 fprintf(stderr, Name
 429                                         ": Could not open bitmap file %s.\n",
 430                                         match->bitmap_file);
 431                                 close(mdfd);
 432                                 return 1;
 433                         }
 434                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 435                                 close(bmfd);
 436                                 fprintf(stderr, Name
 437                                         ": Failed to set bitmapfile for %s.\n",
 438                                         chosen_name);
 439                                 close(mdfd);
 440                                 return 1;
 441                         }
 442                         close(bmfd);
 443                 }
 444                 sra = sysfs_read(mdfd, fd2devnum(mdfd), 0);
 445                 if ((sra == NULL || active_disks >= info.array.working_disks)
 446                     && trustworthy != FOREIGN)
 447                         rv = ioctl(mdfd, RUN_ARRAY, NULL);
 448                 else
 449                         rv = sysfs_set_str(sra, NULL,
 450                                            "array_state", "read-auto");
 451                 if (rv == 0) {
 452                         if (verbose >= 0)
 453                                 fprintf(stderr, Name
 454                            ": %s attached to %s, which has been started.\n",
 455                                         devname, chosen_name);
 456                         rv = 0;
 457                 } else {
 458                         fprintf(stderr, Name
 459                              ": %s attached to %s, but failed to start: %s.\n",
 460                                 devname, chosen_name, strerror(errno));
 461                         rv = 1;
 462                 }
 463         } else {
 464                 if (verbose >= 0)
 465                         fprintf(stderr, Name
 466                           ": %s attached to %s, not enough to start safely.\n",
 467                                 devname, chosen_name);
 468                 rv = 0;
 469         }
 470         close(mdfd);
 471         return rv;
 472 }
 473
 474 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
 475                         int number, __u64 events, int verbose,
 476                         char *array_name)
 477 {
 478         /* Find a device attached to this array with a disk.number of number
 479          * and events less than the passed events, and remove the device.
 480          */
 481         struct mdinfo *d;
 482         mdu_array_info_t ra;
 483
 484         if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
 485                 return; /* not safe to remove from active arrays
 486                          * without thinking more */
 487
 488         for (d = sra->devs; d ; d = d->next) {
 489                 char dn[10];
 490                 int dfd;
 491                 struct mdinfo info;
 492                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 493                 dfd = dev_open(dn, O_RDONLY);
 494                 if (dfd < 0)
 495                         continue;
 496                 if (st->ss->load_super(st, dfd, NULL)) {
 497                         close(dfd);
 498                         continue;
 499                 }
 500                 st->ss->getinfo_super(st, &info);
 501                 st->ss->free_super(st);
 502                 close(dfd);
 503
 504                 if (info.disk.number != number ||
 505                     info.events >= events)
 506                         continue;
 507
 508                 if (d->disk.raid_disk > -1)
 509                         sysfs_set_str(sra, d, "slot", "none");
 510                 if (sysfs_set_str(sra, d, "state", "remove") == 0)
 511                         if (verbose >= 0)
 512                                 fprintf(stderr, Name
 513                                         ": removing old device %s from %s\n",
 514                                         d->sys_name+4, array_name);
 515         }
 516 }
 517
 518 static int count_active(struct supertype *st, int mdfd, char **availp,
 519                         struct mdinfo *bestinfo)
 520 {
 521         /* count how many devices in sra think they are active */
 522         struct mdinfo *d;
 523         int cnt = 0, cnt1 = 0;
 524         __u64 max_events = 0;
 525         struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
 526         char *avail = NULL;
 527
 528         for (d = sra->devs ; d ; d = d->next) {
 529                 char dn[30];
 530                 int dfd;
 531                 int ok;
 532                 struct mdinfo info;
 533
 534                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 535                 dfd = dev_open(dn, O_RDONLY);
 536                 if (dfd < 0)
 537                         continue;
 538                 ok =  st->ss->load_super(st, dfd, NULL);
 539                 close(dfd);
 540                 if (ok != 0)
 541                         continue;
 542                 st->ss->getinfo_super(st, &info);
 543                 if (!avail) {
 544                         avail = malloc(info.array.raid_disks);
 545                         if (!avail) {
 546                                 fprintf(stderr, Name ": out of memory.\n");
 547                                 exit(1);
 548                         }
 549                         memset(avail, 0, info.array.raid_disks);
 550                         *availp = avail;
 551                 }
 552
 553                 if (info.disk.state & (1<<MD_DISK_SYNC))
 554                 {
 555                         if (cnt == 0) {
 556                                 cnt++;
 557                                 max_events = info.events;
 558                                 avail[info.disk.raid_disk] = 2;
 559                                 st->ss->getinfo_super(st, bestinfo);
 560                         } else if (info.events == max_events) {
 561                                 cnt++;
 562                                 avail[info.disk.raid_disk] = 2;
 563                         } else if (info.events == max_events-1) {
 564                                 cnt1++;
 565                                 avail[info.disk.raid_disk] = 1;
 566                         } else if (info.events < max_events - 1)
 567                                 ;
 568                         else if (info.events == max_events+1) {
 569                                 int i;
 570                                 cnt1 = cnt;
 571                                 cnt = 1;
 572                                 max_events = info.events;
 573                                 for (i=0; i<info.array.raid_disks; i++)
 574                                         if (avail[i])
 575                                                 avail[i]--;
 576                                 avail[info.disk.raid_disk] = 2;
 577                                 st->ss->getinfo_super(st, bestinfo);
 578                         } else { /* info.events much bigger */
 579                                 cnt = 1; cnt1 = 0;
 580                                 memset(avail, 0, info.disk.raid_disk);
 581                                 max_events = info.events;
 582                                 st->ss->getinfo_super(st, bestinfo);
 583                         }
 584                 }
 585                 st->ss->free_super(st);
 586         }
 587         return cnt + cnt1;
 588 }
 589
 590 void RebuildMap(void)
 591 {
 592         struct mdstat_ent *mdstat = mdstat_read(0, 0);
 593         struct mdstat_ent *md;
 594         struct map_ent *map = NULL;
 595         int mdp = get_mdp_major();
 596
 597         for (md = mdstat ; md ; md = md->next) {
 598                 struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
 599                 struct mdinfo *sd;
 600
 601                 for (sd = sra->devs ; sd ; sd = sd->next) {
 602                         char dn[30];
 603                         int dfd;
 604                         int ok;
 605                         struct supertype *st;
 606                         char *path;
 607                         struct mdinfo info;
 608
 609                         sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor);
 610                         dfd = dev_open(dn, O_RDONLY);
 611                         if (dfd < 0)
 612                                 continue;
 613                         st = guess_super(dfd);
 614                         if ( st == NULL)
 615                                 ok = -1;
 616                         else
 617                                 ok = st->ss->load_super(st, dfd, NULL);
 618                         close(dfd);
 619                         if (ok != 0)
 620                                 continue;
 621                         st->ss->getinfo_super(st, &info);
 622                         if (md->devnum > 0)
 623                                 path = map_dev(MD_MAJOR, md->devnum, 0);
 624                         else
 625                                 path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
 626                         map_add(&map, md->devnum,
 627                                 info.text_version,
 628                                 info.uuid, path ? : "/unknown");
 629                         st->ss->free_super(st);
 630                         break;
 631                 }
 632                 sysfs_free(sra);
 633         }
 634         map_write(map);
 635         map_free(map);
 636         for (md = mdstat ; md ; md = md->next) {
 637                 struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_VERSION);
 638                 sysfs_uevent(sra, "change");
 639                 sysfs_free(sra);
 640         }
 641 }
 642
 643 int IncrementalScan(int verbose)
 644 {
 645         /* look at every device listed in the 'map' file.
 646          * If one is found that is not running then:
 647          *  look in mdadm.conf for bitmap file.
 648          *   if one exists, but array has none, add it.
 649          *  try to start array in auto-readonly mode
 650          */
 651         struct map_ent *mapl = NULL;
 652         struct map_ent *me;
 653         mddev_ident_t devs, mddev;
 654         int rv = 0;
 655
 656         map_read(&mapl);
 657         devs = conf_get_ident(NULL);
 658
 659         for (me = mapl ; me ; me = me->next) {
 660                 mdu_array_info_t array;
 661                 mdu_bitmap_file_t bmf;
 662                 struct mdinfo *sra;
 663                 int mdfd = open_mddev(me->path, 0);
 664
 665                 if (mdfd < 0)
 666                         continue;
 667                 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
 668                     errno != ENODEV) {
 669                         close(mdfd);
 670                         continue;
 671                 }
 672                 /* Ok, we can try this one.   Maybe it needs a bitmap */
 673                 for (mddev = devs ; mddev ; mddev = mddev->next)
 674                         if (mddev->devname
 675                             && strcmp(mddev->devname, me->path) == 0)
 676                                 break;
 677                 if (mddev && mddev->bitmap_file) {
 678                         /*
 679                          * Note: early kernels will wrongly fail this, so it
 680                          * is a hint only
 681                          */
 682                         int added = -1;
 683                         if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
 684                                 int bmfd = open(mddev->bitmap_file, O_RDWR);
 685                                 if (bmfd >= 0) {
 686                                         added = ioctl(mdfd, SET_BITMAP_FILE,
 687                                                       bmfd);
 688                                         close(bmfd);
 689                                 }
 690                         }
 691                         if (verbose >= 0) {
 692                                 if (added == 0)
 693                                         fprintf(stderr, Name
 694                                                 ": Added bitmap %s to %s\n",
 695                                                 mddev->bitmap_file, me->path);
 696                                 else if (errno != EEXIST)
 697                                         fprintf(stderr, Name
 698                                            ": Failed to add bitmap to %s: %s\n",
 699                                                 me->path, strerror(errno));
 700                         }
 701                 }
 702                 sra = sysfs_read(mdfd, 0, 0);
 703                 if (sra) {
 704                         if (sysfs_set_str(sra, NULL,
 705                                           "array_state", "read-auto") == 0) {
 706                                 if (verbose >= 0)
 707                                         fprintf(stderr, Name
 708                                                 ": started array %s\n",
 709                                                 me->path);
 710                         } else {
 711                                 fprintf(stderr, Name
 712                                         ": failed to start array %s: %s\n",
 713                                         me->path, strerror(errno));
 714                                 rv = 1;
 715                         }
 716                 }
 717         }
 718         return rv;
 719 }
 720
 721 static char *container2devname(char *devname)
 722 {
 723         char *mdname = NULL;
 724
 725         if (devname[0] == '/') {
 726                 int fd = open(devname, O_RDONLY);
 727                 if (fd >= 0) {
 728                         mdname = devnum2devname(fd2devnum(fd));
 729                         close(fd);
 730                 }
 731         } else {
 732                 int uuid[4];
 733                 struct map_ent *mp, *map = NULL;
 734
 735                 if (!parse_uuid(devname, uuid))
 736                         return mdname;
 737                 mp = map_by_uuid(&map, uuid);
 738                 if (mp)
 739                         mdname = devnum2devname(mp->devnum);
 740                 map_free(map);
 741         }
 742
 743         return mdname;
 744 }
 745
 746 int Incremental_container(struct supertype *st, char *devname, int verbose,
 747                           int runstop, int autof, int trustworthy)
 748 {
 749         /* Collect the contents of this container and for each
 750          * array, choose a device name and assemble the array.
 751          */
 752
 753         struct mdinfo *list = st->ss->container_content(st);
 754         struct mdinfo *ra;
 755         struct map_ent *map = NULL;
 756
 757         map_lock(&map);
 758
 759         for (ra = list ; ra ; ra = ra->next) {
 760                 int mdfd;
 761                 char chosen_name[1024];
 762                 struct map_ent *mp;
 763                 struct mddev_ident_s *match = NULL;
 764                 int err;
 765
 766                 mp = map_by_uuid(&map, ra->uuid);
 767
 768                 if (!mp) {
 769
 770                         /* Check in mdadm.conf for devices == devname and
 771                          * member == ra->text_version after second slash.
 772                          */
 773                         char *sub = strchr(ra->text_version+1, '/');
 774                         struct mddev_ident_s *array_list;
 775                         if (sub) {
 776                                 sub++;
 777                                 array_list = conf_get_ident(NULL);
 778                         } else
 779                                 array_list = NULL;
 780                         for(; array_list ; array_list = array_list->next) {
 781                                 char *dn;
 782                                 if (array_list->member == NULL ||
 783                                     array_list->container == NULL)
 784                                         continue;
 785                                 if (strcmp(array_list->member, sub) != 0)
 786                                         continue;
 787                                 if (array_list->uuid_set &&
 788                                     !same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
 789                                         continue;
 790                                 dn = container2devname(array_list->container);
 791                                 if (dn == NULL)
 792                                         continue;
 793                                 if (strncmp(dn, ra->text_version+1,
 794                                             strlen(dn)) != 0 ||
 795                                     ra->text_version[strlen(dn)+1] != '/') {
 796                                         free(dn);
 797                                         continue;
 798                                 }
 799                                 free(dn);
 800                                 /* we have a match */
 801                                 match = array_list;
 802                                 if (verbose>0)
 803                                         fprintf(stderr, Name ": match found for member %s\n",
 804                                                 array_list->member);
 805                                 break;
 806                         }
 807                 }
 808
 809                 mdfd = create_mddev(match ? match->devname : NULL,
 810                                     ra->name,
 811                                     autof,
 812                                     trustworthy,
 813                                     chosen_name);
 814
 815                 if (mdfd < 0) {
 816                         fprintf(stderr, Name ": failed to open %s: %s.\n",
 817                                 chosen_name, strerror(errno));
 818                         return 2;
 819                 }
 820
 821                 err = assemble_container_content(st, mdfd, ra, runstop,
 822                                                  chosen_name, verbose);
 823                 close(mdfd);
 824                 if (err)
 825                         return err;
 826         }
 827         map_unlock(&map);
 828         return 0;
 829 }