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 sensibe 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, reject.
  52          * 4/ Determine device number.
  53          * - If in mdadm.conf with std name, use that
  54          * - UUID in /var/run/mdadm.map  use that
  55          * - If name is suggestive, use that. unless in use with different uuid.
  56          * - Choose a free, high number.
  57          * - Use a partitioned device unless strong suggestion not to.
  58          *         e.g. auto=md
  59          * 5/ Find out if array already exists
  60          * 5a/ if it does not
  61          * - choose a name, from mdadm.conf or 'name' field in array.
  62          * - create the array
  63          * - add the device
  64          * 5b/ if it does
  65          * - check one drive in array to make sure metadata is a reasonably
  66          *       close match.  Reject if not (e.g. different type)
  67          * - add the device
  68          * 6/ Make sure /var/run/mdadm.map contains this array.
  69          * 7/ Is there enough devices to possibly start the array?
  70          * 7a/ if not, finish with success.
  71          * 7b/ if yes,
  72          * - read all metadata and arrange devices like -A does
  73          * - if number of OK devices match expected, or -R and there are enough,
  74          *   start the array (auto-readonly).
  75          */
  76         struct stat stb;
  77         struct mdinfo info, info2;
  78         struct mddev_ident_s *array_list, *match;
  79         char chosen_name[1024];
  80         int rv;
  81         int devnum;
  82         struct map_ent *mp, *map = NULL;
  83         int dfd, mdfd;
  84         char *avail;
  85         int active_disks;
  86
  87
  88         struct createinfo *ci = conf_get_create_info();
  89
  90         if (autof == 0)
  91                 autof = ci->autof;
  92
  93         /* 1/ Check if devices is permitted by mdadm.conf */
  94
  95         if (!conf_test_dev(devname)) {
  96                 if (verbose >= 0)
  97                         fprintf(stderr, Name
  98                                 ": %s not permitted by mdadm.conf.\n",
  99                                 devname);
 100                 return 1;
 101         }
 102
 103         /* 2/ Find metadata, reject if none appropriate (check
 104          *            version/name from args) */
 105
 106         dfd = dev_open(devname, O_RDONLY|O_EXCL);
 107         if (dfd < 0) {
 108                 if (verbose >= 0)
 109                         fprintf(stderr, Name ": cannot open %s: %s.\n",
 110                                 devname, strerror(errno));
 111                 return 1;
 112         }
 113         if (fstat(dfd, &stb) < 0) {
 114                 if (verbose >= 0)
 115                         fprintf(stderr, Name ": fstat failed for %s: %s.\n",
 116                                 devname, strerror(errno));
 117                 close(dfd);
 118                 return 1;
 119         }
 120         if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 121                 if (verbose >= 0)
 122                         fprintf(stderr, Name ": %s is not a block device.\n",
 123                                 devname);
 124                 close(dfd);
 125                 return 1;
 126         }
 127
 128         if (st == NULL && (st = guess_super(dfd)) == NULL) {
 129                 if (verbose >= 0)
 130                         fprintf(stderr, Name
 131                                 ": no recognisable superblock on %s.\n",
 132                                 devname);
 133                 close(dfd);
 134                 return 1;
 135         }
 136         if (st->ss->load_super(st, dfd, NULL)) {
 137                 if (verbose >= 0)
 138                         fprintf(stderr, Name ": no RAID superblock on %s.\n",
 139                                 devname);
 140                 close(dfd);
 141                 return 1;
 142         }
 143         st->ss->getinfo_super(st, &info);
 144         close (dfd);
 145
 146         /* 3/ Check if there is a match in mdadm.conf */
 147
 148         array_list = conf_get_ident(NULL);
 149         match = NULL;
 150         for (; array_list; array_list = array_list->next) {
 151                 if (array_list->uuid_set &&
 152                     same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
 153                     == 0) {
 154                         if (verbose >= 2)
 155                                 fprintf(stderr, Name
 156                                         ": UUID differs from %s.\n",
 157                                         array_list->devname);
 158                         continue;
 159                 }
 160                 if (array_list->name[0] &&
 161                     strcasecmp(array_list->name, info.name) != 0) {
 162                         if (verbose >= 2)
 163                                 fprintf(stderr, Name
 164                                         ": Name differs from %s.\n",
 165                                         array_list->devname);
 166                         continue;
 167                 }
 168                 if (array_list->devices &&
 169                     !match_oneof(array_list->devices, devname)) {
 170                         if (verbose >= 2)
 171                                 fprintf(stderr, Name
 172                                         ": Not a listed device for %s.\n",
 173                                         array_list->devname);
 174                         continue;
 175                 }
 176                 if (array_list->super_minor != UnSet &&
 177                     array_list->super_minor != info.array.md_minor) {
 178                         if (verbose >= 2)
 179                                 fprintf(stderr, Name
 180                                         ": Different super-minor to %s.\n",
 181                                         array_list->devname);
 182                         continue;
 183                 }
 184                 if (!array_list->uuid_set &&
 185                     !array_list->name[0] &&
 186                     !array_list->devices &&
 187                     array_list->super_minor == UnSet) {
 188                         if (verbose  >= 2)
 189                                 fprintf(stderr, Name
 190                              ": %s doesn't have any identifying information.\n",
 191                                         array_list->devname);
 192                         continue;
 193                 }
 194                 /* FIXME, should I check raid_disks and level too?? */
 195
 196                 if (match) {
 197                         if (verbose >= 0)
 198                                 fprintf(stderr, Name
 199                    ": we match both %s and %s - cannot decide which to use.\n",
 200                                         match->devname, array_list->devname);
 201                         return 2;
 202                 }
 203                 match = array_list;
 204         }
 205
 206         /* 3a/ if not, check for homehost match.  If no match, reject. */
 207         if (!match) {
 208                 if (homehost == NULL ||
 209                     st->ss->match_home(st, homehost) == 0) {
 210                         if (verbose >= 0)
 211                                 fprintf(stderr, Name
 212               ": not found in mdadm.conf and not identified by homehost.\n");
 213                         return 2;
 214                 }
 215         }
 216         /* 4/ Determine device number. */
 217         /* - If in mdadm.conf with std name, use that */
 218         /* - UUID in /var/run/mdadm.map  use that */
 219         /* - If name is suggestive, use that. unless in use with */
 220         /*           different uuid. */
 221         /* - Choose a free, high number. */
 222         /* - Use a partitioned device unless strong suggestion not to. */
 223         /*         e.g. auto=md */
 224         if (match && is_standard(match->devname, &devnum))
 225                 /* We have devnum now */;
 226         else if ((mp = map_by_uuid(&map, info.uuid)) != NULL)
 227                 devnum = mp->devnum;
 228         else {
 229                 /* Have to guess a bit. */
 230                 int use_partitions = 1;
 231                 char *np, *ep;
 232                 if ((autof&7) == 3 || (autof&7) == 5)
 233                         use_partitions = 0;
 234                 np = strchr(info.name, ':');
 235                 if (np)
 236                         np++;
 237                 else
 238                         np = info.name;
 239                 devnum = strtoul(np, &ep, 10);
 240                 if (ep > np && *ep == 0) {
 241                         /* This is a number.  Let check that it is unused. */
 242                         if (mddev_busy(use_partitions ? (-1-devnum) : devnum))
 243                                 devnum = -1;
 244                 } else
 245                         devnum = -1;
 246
 247                 if (devnum < 0) {
 248                         /* Haven't found anything yet, choose something free */
 249                         devnum = find_free_devnum(use_partitions);
 250
 251                         if (devnum == NoMdDev) {
 252                                 fprintf(stderr, Name
 253                                         ": No spare md devices!!\n");
 254                                 return 2;
 255                         }
 256                 } else
 257                         devnum = use_partitions ? (-1-devnum) : devnum;
 258         }
 259         mdfd = open_mddev_devnum(match ? match->devname : NULL,
 260                                  devnum,
 261                                  info.name,
 262                                  chosen_name, autof >> 3);
 263         if (mdfd < 0) {
 264                 fprintf(stderr, Name ": failed to open %s: %s.\n",
 265                         chosen_name, strerror(errno));
 266                 return 2;
 267         }
 268         /* 5/ Find out if array already exists */
 269         if (! mddev_busy(devnum)) {
 270         /* 5a/ if it does not */
 271         /* - choose a name, from mdadm.conf or 'name' field in array. */
 272         /* - create the array */
 273         /* - add the device */
 274                 mdu_array_info_t ainf;
 275                 mdu_disk_info_t disk;
 276                 char md[20];
 277                 struct mdinfo *sra;
 278
 279                 memset(&ainf, 0, sizeof(ainf));
 280                 ainf.major_version = st->ss->major;
 281                 ainf.minor_version = st->minor_version;
 282                 if (ioctl(mdfd, SET_ARRAY_INFO, &ainf) != 0) {
 283                         fprintf(stderr, Name
 284                                 ": SET_ARRAY_INFO failed for %s: %s\b",
 285                                 chosen_name, strerror(errno));
 286                         close(mdfd);
 287                         return 2;
 288                 }
 289                 sprintf(md, "%d.%d\n", st->ss->major, st->minor_version);
 290                 sra = sysfs_read(mdfd, devnum, GET_VERSION);
 291                 sysfs_set_str(sra, NULL, "metadata_version", md);
 292                 memset(&disk, 0, sizeof(disk));
 293                 disk.major = major(stb.st_rdev);
 294                 disk.minor = minor(stb.st_rdev);
 295                 sysfs_free(sra);
 296                 if (ioctl(mdfd, ADD_NEW_DISK, &disk) != 0) {
 297                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 298                                 devname, chosen_name, strerror(errno));
 299                         ioctl(mdfd, STOP_ARRAY, 0);
 300                         close(mdfd);
 301                         return 2;
 302                 }
 303                 sra = sysfs_read(mdfd, devnum, GET_DEVS);
 304                 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
 305                         /* It really should be 'none' - must be old buggy
 306                          * kernel, and mdadm -I may not be able to complete.
 307                          * So reject it.
 308                          */
 309                         ioctl(mdfd, STOP_ARRAY, NULL);
 310                         fprintf(stderr, Name
 311                       ": You have an old buggy kernel which cannot support\n"
 312                                 "      --incremental reliably.  Aborting.\n");
 313                         close(mdfd);
 314                         sysfs_free(sra);
 315                         return 2;
 316                 }
 317         } else {
 318         /* 5b/ if it does */
 319         /* - check one drive in array to make sure metadata is a reasonably */
 320         /*        close match.  Reject if not (e.g. different type) */
 321         /* - add the device */
 322                 char dn[20];
 323                 int dfd2;
 324                 mdu_disk_info_t disk;
 325                 int err;
 326                 struct mdinfo *sra;
 327                 struct supertype *st2;
 328                 sra = sysfs_read(mdfd, devnum, (GET_VERSION | GET_DEVS |
 329                                                 GET_STATE));
 330
 331                 if (sra->array.major_version != st->ss->major ||
 332                     sra->array.minor_version != st->minor_version) {
 333                         if (verbose >= 0)
 334                                 fprintf(stderr, Name
 335               ": %s has different metadata to chosen array %s %d.%d %d.%d.\n",
 336                                         devname, chosen_name,
 337                                         sra->array.major_version,
 338                                         sra->array.minor_version,
 339                                         st->ss->major, st->minor_version);
 340                         close(mdfd);
 341                         return 1;
 342                 }
 343                 sprintf(dn, "%d:%d", sra->devs->disk.major,
 344                         sra->devs->disk.minor);
 345                 dfd2 = dev_open(dn, O_RDONLY);
 346                 st2 = dup_super(st);
 347                 if (st2->ss->load_super(st2, dfd2, NULL)) {
 348                         fprintf(stderr, Name
 349                                 ": Strange error loading metadata for %s.\n",
 350                                 chosen_name);
 351                         close(mdfd);
 352                         close(dfd2);
 353                         return 2;
 354                 }
 355                 close(dfd2);
 356                 st2->ss->getinfo_super(st2, &info2);
 357                 st2->ss->free_super(st2);
 358                 if (info.array.level != info2.array.level ||
 359                     memcmp(info.uuid, info2.uuid, 16) != 0 ||
 360                     info.array.raid_disks != info2.array.raid_disks) {
 361                         fprintf(stderr, Name
 362                                 ": unexpected difference between %s and %s.\n",
 363                                 chosen_name, devname);
 364                         close(mdfd);
 365                         return 2;
 366                 }
 367                 memset(&disk, 0, sizeof(disk));
 368                 disk.major = major(stb.st_rdev);
 369                 disk.minor = minor(stb.st_rdev);
 370                 err = ioctl(mdfd, ADD_NEW_DISK, &disk);
 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 = ioctl(mdfd, ADD_NEW_DISK, &disk);
 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         }
 386         /* 6/ Make sure /var/run/mdadm.map contains this array. */
 387         map_update(&map, devnum,
 388                    info.array.major_version,
 389                    info.array.minor_version,
 390                    info.uuid, chosen_name);
 391
 392         /* 7/ Is there enough devices to possibly start the array? */
 393         /* 7a/ if not, finish with success. */
 394         avail = NULL;
 395         active_disks = count_active(st, mdfd, &avail, &info);
 396         if (enough(info.array.level, info.array.raid_disks,
 397                    info.array.layout, info.array.state & 1,
 398                    avail, active_disks) == 0) {
 399                 free(avail);
 400                 if (verbose >= 0)
 401                         fprintf(stderr, Name
 402                              ": %s attached to %s, not enough to start (%d).\n",
 403                                 devname, chosen_name, active_disks);
 404                 close(mdfd);
 405                 return 0;
 406         }
 407         free(avail);
 408
 409         /* 7b/ if yes, */
 410         /* - if number of OK devices match expected, or -R and there */
 411         /*             are enough, */
 412         /*   + add any bitmap file  */
 413         /*   + start the array (auto-readonly). */
 414 {
 415         mdu_array_info_t ainf;
 416
 417         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 418                 if (verbose >= 0)
 419                         fprintf(stderr, Name
 420                            ": %s attached to %s which is already active.\n",
 421                                 devname, chosen_name);
 422                 close (mdfd);
 423                 return 0;
 424         }
 425 }
 426         if (runstop > 0 || active_disks >= info.array.working_disks) {
 427                 struct mdinfo *sra;
 428                 /* Let's try to start it */
 429                 if (match && match->bitmap_file) {
 430                         int bmfd = open(match->bitmap_file, O_RDWR);
 431                         if (bmfd < 0) {
 432                                 fprintf(stderr, Name
 433                                         ": Could not open bitmap file %s.\n",
 434                                         match->bitmap_file);
 435                                 close(mdfd);
 436                                 return 1;
 437                         }
 438                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 439                                 close(bmfd);
 440                                 fprintf(stderr, Name
 441                                         ": Failed to set bitmapfile for %s.\n",
 442                                         chosen_name);
 443                                 close(mdfd);
 444                                 return 1;
 445                         }
 446                         close(bmfd);
 447                 }
 448                 sra = sysfs_read(mdfd, devnum, 0);
 449                 if (sra == NULL || active_disks >= info.array.working_disks)
 450                         rv = ioctl(mdfd, RUN_ARRAY, NULL);
 451                 else
 452                         rv = sysfs_set_str(sra, NULL,
 453                                            "array_state", "read-auto");
 454                 if (rv == 0) {
 455                         if (verbose >= 0)
 456                                 fprintf(stderr, Name
 457                            ": %s attached to %s, which has been started.\n",
 458                                         devname, chosen_name);
 459                         rv = 0;
 460                 } else {
 461                         fprintf(stderr, Name
 462                              ": %s attached to %s, but failed to start: %s.\n",
 463                                 devname, chosen_name, strerror(errno));
 464                         rv = 1;
 465                 }
 466         } else {
 467                 if (verbose >= 0)
 468                         fprintf(stderr, Name
 469                           ": %s attached to %s, not enough to start safely.\n",
 470                                 devname, chosen_name);
 471                 rv = 0;
 472         }
 473         close(mdfd);
 474         return rv;
 475 }
 476
 477 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
 478                         int number, __u64 events, int verbose,
 479                         char *array_name)
 480 {
 481         /* Find a device attached to this array with a disk.number of number
 482          * and events less than the passed events, and remove the device.
 483          */
 484         struct mdinfo *d;
 485         mdu_array_info_t ra;
 486
 487         if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
 488                 return; /* not safe to remove from active arrays
 489                          * without thinking more */
 490
 491         for (d = sra->devs; d ; d = d->next) {
 492                 char dn[10];
 493                 int dfd;
 494                 struct mdinfo info;
 495                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 496                 dfd = dev_open(dn, O_RDONLY);
 497                 if (dfd < 0)
 498                         continue;
 499                 if (st->ss->load_super(st, dfd, NULL)) {
 500                         close(dfd);
 501                         continue;
 502                 }
 503                 st->ss->getinfo_super(st, &info);
 504                 st->ss->free_super(st);
 505                 close(dfd);
 506
 507                 if (info.disk.number != number ||
 508                     info.events >= events)
 509                         continue;
 510
 511                 if (d->disk.raid_disk > -1)
 512                         sysfs_set_str(sra, d, "slot", "none");
 513                 if (sysfs_set_str(sra, d, "state", "remove") == 0)
 514                         if (verbose >= 0)
 515                                 fprintf(stderr, Name
 516                                         ": removing old device %s from %s\n",
 517                                         d->sys_name+4, array_name);
 518         }
 519 }
 520
 521 static int count_active(struct supertype *st, int mdfd, char **availp,
 522                         struct mdinfo *bestinfo)
 523 {
 524         /* count how many devices in sra think they are active */
 525         struct mdinfo *d;
 526         int cnt = 0, cnt1 = 0;
 527         __u64 max_events = 0;
 528         struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
 529         char *avail = NULL;
 530
 531         for (d = sra->devs ; d ; d = d->next) {
 532                 char dn[30];
 533                 int dfd;
 534                 int ok;
 535                 struct mdinfo info;
 536
 537                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 538                 dfd = dev_open(dn, O_RDONLY);
 539                 if (dfd < 0)
 540                         continue;
 541                 ok =  st->ss->load_super(st, dfd, NULL);
 542                 close(dfd);
 543                 if (ok != 0)
 544                         continue;
 545                 st->ss->getinfo_super(st, &info);
 546                 if (info.disk.state & (1<<MD_DISK_SYNC))
 547                 {
 548                         if (avail == NULL) {
 549                                 avail = malloc(info.array.raid_disks);
 550                                 memset(avail, 0, info.array.raid_disks);
 551                         }
 552                         if (cnt == 0) {
 553                                 cnt++;
 554                                 max_events = info.events;
 555                                 avail[info.disk.raid_disk] = 2;
 556                                 st->ss->getinfo_super(st, bestinfo);
 557                         } else if (info.events == max_events) {
 558                                 cnt++;
 559                                 avail[info.disk.raid_disk] = 2;
 560                         } else if (info.events == max_events-1) {
 561                                 cnt1++;
 562                                 avail[info.disk.raid_disk] = 1;
 563                         } else if (info.events < max_events - 1)
 564                                 ;
 565                         else if (info.events == max_events+1) {
 566                                 int i;
 567                                 cnt1 = cnt;
 568                                 cnt = 1;
 569                                 max_events = info.events;
 570                                 for (i=0; i<info.array.raid_disks; i++)
 571                                         if (avail[i])
 572                                                 avail[i]--;
 573                                 avail[info.disk.raid_disk] = 2;
 574                                 st->ss->getinfo_super(st, bestinfo);
 575                         } else { /* info.events much bigger */
 576                                 cnt = 1; cnt1 = 0;
 577                                 memset(avail, 0, info.disk.raid_disk);
 578                                 max_events = info.events;
 579                                 st->ss->getinfo_super(st, bestinfo);
 580                         }
 581                 }
 582                 st->ss->free_super(st);
 583         }
 584         return cnt + cnt1;
 585 }
 586
 587 void RebuildMap(void)
 588 {
 589         struct mdstat_ent *mdstat = mdstat_read(0, 0);
 590         struct mdstat_ent *md;
 591         struct map_ent *map = NULL;
 592         int mdp = get_mdp_major();
 593
 594         for (md = mdstat ; md ; md = md->next) {
 595                 struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
 596                 struct mdinfo *sd;
 597
 598                 for (sd = sra->devs ; sd ; sd = sd->next) {
 599                         char dn[30];
 600                         int dfd;
 601                         int ok;
 602                         struct supertype *st;
 603                         char *path;
 604                         struct mdinfo info;
 605
 606                         sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor);
 607                         dfd = dev_open(dn, O_RDONLY);
 608                         if (dfd < 0)
 609                                 continue;
 610                         st = guess_super(dfd);
 611                         if ( st == NULL)
 612                                 ok = -1;
 613                         else
 614                                 ok = st->ss->load_super(st, dfd, NULL);
 615                         close(dfd);
 616                         if (ok != 0)
 617                                 continue;
 618                         st->ss->getinfo_super(st, &info);
 619                         if (md->devnum > 0)
 620                                 path = map_dev(MD_MAJOR, md->devnum, 0);
 621                         else
 622                                 path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
 623                         map_add(&map, md->devnum, st->ss->major,
 624                                 st->minor_version,
 625                                 info.uuid, path ? : "/unknown");
 626                         st->ss->free_super(st);
 627                         break;
 628                 }
 629         }
 630         map_write(map);
 631         map_free(map);
 632 }
 633
 634 int IncrementalScan(int verbose)
 635 {
 636         /* look at every device listed in the 'map' file.
 637          * If one is found that is not running then:
 638          *  look in mdadm.conf for bitmap file.
 639          *   if one exists, but array has none, add it.
 640          *  try to start array in auto-readonly mode
 641          */
 642         struct map_ent *mapl = NULL;
 643         struct map_ent *me;
 644         mddev_ident_t devs, mddev;
 645         int rv = 0;
 646
 647         map_read(&mapl);
 648         devs = conf_get_ident(NULL);
 649
 650         for (me = mapl ; me ; me = me->next) {
 651                 char path[1024];
 652                 mdu_array_info_t array;
 653                 mdu_bitmap_file_t bmf;
 654                 struct mdinfo *sra;
 655                 int mdfd = open_mddev_devnum(me->path, me->devnum,
 656                                              NULL, path, 0);
 657                 if (mdfd < 0)
 658                         continue;
 659                 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
 660                     errno != ENODEV) {
 661                         close(mdfd);
 662                         continue;
 663                 }
 664                 /* Ok, we can try this one.   Maybe it needs a bitmap */
 665                 for (mddev = devs ; mddev ; mddev = mddev->next)
 666                         if (strcmp(mddev->devname, me->path) == 0)
 667                                 break;
 668                 if (mddev && mddev->bitmap_file) {
 669                         /*
 670                          * Note: early kernels will wrongly fail this, so it
 671                          * is a hint only
 672                          */
 673                         int added = -1;
 674                         if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
 675                                 int bmfd = open(mddev->bitmap_file, O_RDWR);
 676                                 if (bmfd >= 0) {
 677                                         added = ioctl(mdfd, SET_BITMAP_FILE,
 678                                                       bmfd);
 679                                         close(bmfd);
 680                                 }
 681                         }
 682                         if (verbose >= 0) {
 683                                 if (added == 0)
 684                                         fprintf(stderr, Name
 685                                                 ": Added bitmap %s to %s\n",
 686                                                 mddev->bitmap_file, me->path);
 687                                 else if (errno != EEXIST)
 688                                         fprintf(stderr, Name
 689                                            ": Failed to add bitmap to %s: %s\n",
 690                                                 me->path, strerror(errno));
 691                         }
 692                 }
 693                 sra = sysfs_read(mdfd, 0, 0);
 694                 if (sra) {
 695                         if (sysfs_set_str(sra, NULL,
 696                                           "array_state", "read-auto") == 0) {
 697                                 if (verbose >= 0)
 698                                         fprintf(stderr, Name
 699                                                 ": started array %s\n",
 700                                                 me->path);
 701                         } else {
 702                                 fprintf(stderr, Name
 703                                         ": failed to start array %s: %s\n",
 704                                         me->path, strerror(errno));
 705                                 rv = 1;
 706                         }
 707                 }
 708         }
 709         return rv;
 710 }