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         struct createinfo *ci = conf_get_create_info();
  87
  88
  89         /* 1/ Check if devices is permitted by mdadm.conf */
  90
  91         if (!conf_test_dev(devname)) {
  92                 if (verbose >= 0)
  93                         fprintf(stderr, Name
  94                                 ": %s not permitted by mdadm.conf.\n",
  95                                 devname);
  96                 return 1;
  97         }
  98
  99         /* 2/ Find metadata, reject if none appropriate (check
 100          *            version/name from args) */
 101
 102         dfd = dev_open(devname, O_RDONLY|O_EXCL);
 103         if (dfd < 0) {
 104                 if (verbose >= 0)
 105                         fprintf(stderr, Name ": cannot open %s: %s.\n",
 106                                 devname, strerror(errno));
 107                 return 1;
 108         }
 109         if (fstat(dfd, &stb) < 0) {
 110                 if (verbose >= 0)
 111                         fprintf(stderr, Name ": fstat failed for %s: %s.\n",
 112                                 devname, strerror(errno));
 113                 close(dfd);
 114                 return 1;
 115         }
 116         if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 117                 if (verbose >= 0)
 118                         fprintf(stderr, Name ": %s is not a block device.\n",
 119                                 devname);
 120                 close(dfd);
 121                 return 1;
 122         }
 123
 124         if (st == NULL && (st = guess_super(dfd)) == NULL) {
 125                 if (verbose >= 0)
 126                         fprintf(stderr, Name
 127                                 ": no recognisable superblock on %s.\n",
 128                                 devname);
 129                 close(dfd);
 130                 return 1;
 131         }
 132         if (st->ss->load_super(st, dfd, NULL)) {
 133                 if (verbose >= 0)
 134                         fprintf(stderr, Name ": no RAID superblock on %s.\n",
 135                                 devname);
 136                 close(dfd);
 137                 return 1;
 138         }
 139         st->ss->getinfo_super(st, &info);
 140         close (dfd);
 141
 142         /* 3/ Check if there is a match in mdadm.conf */
 143
 144         array_list = conf_get_ident(NULL);
 145         match = NULL;
 146         for (; array_list; array_list = array_list->next) {
 147                 if (array_list->uuid_set &&
 148                     same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
 149                     == 0) {
 150                         if (verbose >= 2)
 151                                 fprintf(stderr, Name
 152                                         ": UUID differs from %s.\n",
 153                                         array_list->devname);
 154                         continue;
 155                 }
 156                 if (array_list->name[0] &&
 157                     strcasecmp(array_list->name, info.name) != 0) {
 158                         if (verbose >= 2)
 159                                 fprintf(stderr, Name
 160                                         ": Name differs from %s.\n",
 161                                         array_list->devname);
 162                         continue;
 163                 }
 164                 if (array_list->devices &&
 165                     !match_oneof(array_list->devices, devname)) {
 166                         if (verbose >= 2)
 167                                 fprintf(stderr, Name
 168                                         ": Not a listed device for %s.\n",
 169                                         array_list->devname);
 170                         continue;
 171                 }
 172                 if (array_list->super_minor != UnSet &&
 173                     array_list->super_minor != info.array.md_minor) {
 174                         if (verbose >= 2)
 175                                 fprintf(stderr, Name
 176                                         ": Different super-minor to %s.\n",
 177                                         array_list->devname);
 178                         continue;
 179                 }
 180                 if (!array_list->uuid_set &&
 181                     !array_list->name[0] &&
 182                     !array_list->devices &&
 183                     array_list->super_minor == UnSet) {
 184                         if (verbose  >= 2)
 185                                 fprintf(stderr, Name
 186                              ": %s doesn't have any identifying information.\n",
 187                                         array_list->devname);
 188                         continue;
 189                 }
 190                 /* FIXME, should I check raid_disks and level too?? */
 191
 192                 if (match) {
 193                         if (verbose >= 0)
 194                                 fprintf(stderr, Name
 195                    ": we match both %s and %s - cannot decide which to use.\n",
 196                                         match->devname, array_list->devname);
 197                         return 2;
 198                 }
 199                 match = array_list;
 200         }
 201
 202         /* 3a/ if not, check for homehost match.  If no match, reject. */
 203         if (!match) {
 204                 if (homehost == NULL ||
 205                     st->ss->match_home(st, homehost) == 0) {
 206                         if (verbose >= 0)
 207                                 fprintf(stderr, Name
 208               ": not found in mdadm.conf and not identified by homehost.\n");
 209                         return 2;
 210                 }
 211         }
 212         /* 4/ Determine device number. */
 213         /* - If in mdadm.conf with std name, get number from name. */
 214         /* - UUID in /var/run/mdadm.map  get number from mapping */
 215         /* - If name is suggestive, use that. unless in use with */
 216         /*           different uuid. */
 217         /* - Choose a free, high number. */
 218         /* - Use a partitioned device unless strong suggestion not to. */
 219         /*         e.g. auto=md */
 220
 221         /* There are three possible sources for 'autof':  command line,
 222          * ARRAY line in mdadm.conf, or CREATE line in mdadm.conf.
 223          * They have precedence in that order.
 224          */
 225         if (autof == 0 && match)
 226                 autof = match->autof;
 227         if (autof == 0)
 228                 autof = ci->autof;
 229
 230         if (match && (rv = is_standard(match->devname, &devnum))) {
 231                 devnum = (rv > 0) ? (-1-devnum) : devnum;
 232         } else if ((mp = map_by_uuid(&map, info.uuid)) != NULL)
 233                 devnum = mp->devnum;
 234         else {
 235                 /* Have to guess a bit. */
 236                 int use_partitions = 1;
 237                 char *np, *ep;
 238                 if ((autof&7) == 3 || (autof&7) == 5)
 239                         use_partitions = 0;
 240                 np = strchr(info.name, ':');
 241                 if (np)
 242                         np++;
 243                 else
 244                         np = info.name;
 245                 devnum = strtoul(np, &ep, 10);
 246                 if (ep > np && *ep == 0) {
 247                         /* This is a number.  Let check that it is unused. */
 248                         if (mddev_busy(use_partitions ? (-1-devnum) : devnum))
 249                                 devnum = -1;
 250                 } else
 251                         devnum = -1;
 252
 253                 if (devnum < 0) {
 254                         /* Haven't found anything yet, choose something free */
 255                         devnum = find_free_devnum(use_partitions);
 256
 257                         if (devnum == NoMdDev) {
 258                                 fprintf(stderr, Name
 259                                         ": No spare md devices!!\n");
 260                                 return 2;
 261                         }
 262                 } else
 263                         devnum = use_partitions ? (-1-devnum) : devnum;
 264         }
 265         mdfd = open_mddev_devnum(match ? match->devname : NULL,
 266                                  devnum,
 267                                  info.name,
 268                                  chosen_name, autof >> 3);
 269         if (mdfd < 0) {
 270                 fprintf(stderr, Name ": failed to open %s: %s.\n",
 271                         chosen_name, strerror(errno));
 272                 return 2;
 273         }
 274         /* 5/ Find out if array already exists */
 275         if (! mddev_busy(devnum)) {
 276         /* 5a/ if it does not */
 277         /* - choose a name, from mdadm.conf or 'name' field in array. */
 278         /* - create the array */
 279         /* - add the device */
 280                 mdu_array_info_t ainf;
 281                 mdu_disk_info_t disk;
 282                 char md[20];
 283                 struct mdinfo *sra;
 284
 285                 memset(&ainf, 0, sizeof(ainf));
 286                 ainf.major_version = st->ss->major;
 287                 ainf.minor_version = st->minor_version;
 288                 if (ioctl(mdfd, SET_ARRAY_INFO, &ainf) != 0) {
 289                         fprintf(stderr, Name
 290                                 ": SET_ARRAY_INFO failed for %s: %s\b",
 291                                 chosen_name, strerror(errno));
 292                         close(mdfd);
 293                         return 2;
 294                 }
 295                 sprintf(md, "%d.%d\n", st->ss->major, st->minor_version);
 296                 sra = sysfs_read(mdfd, devnum, GET_VERSION);
 297                 sysfs_set_str(sra, NULL, "metadata_version", md);
 298                 memset(&disk, 0, sizeof(disk));
 299                 disk.major = major(stb.st_rdev);
 300                 disk.minor = minor(stb.st_rdev);
 301                 sysfs_free(sra);
 302                 if (ioctl(mdfd, ADD_NEW_DISK, &disk) != 0) {
 303                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 304                                 devname, chosen_name, strerror(errno));
 305                         ioctl(mdfd, STOP_ARRAY, 0);
 306                         close(mdfd);
 307                         return 2;
 308                 }
 309                 sra = sysfs_read(mdfd, devnum, GET_DEVS);
 310                 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
 311                         /* It really should be 'none' - must be old buggy
 312                          * kernel, and mdadm -I may not be able to complete.
 313                          * So reject it.
 314                          */
 315                         ioctl(mdfd, STOP_ARRAY, NULL);
 316                         fprintf(stderr, Name
 317                       ": You have an old buggy kernel which cannot support\n"
 318                                 "      --incremental reliably.  Aborting.\n");
 319                         close(mdfd);
 320                         sysfs_free(sra);
 321                         return 2;
 322                 }
 323         } else {
 324         /* 5b/ if it does */
 325         /* - check one drive in array to make sure metadata is a reasonably */
 326         /*        close match.  Reject if not (e.g. different type) */
 327         /* - add the device */
 328                 char dn[20];
 329                 int dfd2;
 330                 mdu_disk_info_t disk;
 331                 int err;
 332                 struct mdinfo *sra;
 333                 struct supertype *st2;
 334                 sra = sysfs_read(mdfd, devnum, (GET_VERSION | GET_DEVS |
 335                                                 GET_STATE));
 336
 337                 if (sra->array.major_version != st->ss->major ||
 338                     sra->array.minor_version != st->minor_version) {
 339                         if (verbose >= 0)
 340                                 fprintf(stderr, Name
 341               ": %s has different metadata to chosen array %s %d.%d %d.%d.\n",
 342                                         devname, chosen_name,
 343                                         sra->array.major_version,
 344                                         sra->array.minor_version,
 345                                         st->ss->major, st->minor_version);
 346                         close(mdfd);
 347                         return 1;
 348                 }
 349                 sprintf(dn, "%d:%d", sra->devs->disk.major,
 350                         sra->devs->disk.minor);
 351                 dfd2 = dev_open(dn, O_RDONLY);
 352                 st2 = dup_super(st);
 353                 if (st2->ss->load_super(st2, dfd2, NULL)) {
 354                         fprintf(stderr, Name
 355                                 ": Strange error loading metadata for %s.\n",
 356                                 chosen_name);
 357                         close(mdfd);
 358                         close(dfd2);
 359                         return 2;
 360                 }
 361                 close(dfd2);
 362                 st2->ss->getinfo_super(st2, &info2);
 363                 st2->ss->free_super(st2);
 364                 if (info.array.level != info2.array.level ||
 365                     memcmp(info.uuid, info2.uuid, 16) != 0 ||
 366                     info.array.raid_disks != info2.array.raid_disks) {
 367                         fprintf(stderr, Name
 368                                 ": unexpected difference between %s and %s.\n",
 369                                 chosen_name, devname);
 370                         close(mdfd);
 371                         return 2;
 372                 }
 373                 memset(&disk, 0, sizeof(disk));
 374                 disk.major = major(stb.st_rdev);
 375                 disk.minor = minor(stb.st_rdev);
 376                 err = ioctl(mdfd, ADD_NEW_DISK, &disk);
 377                 if (err < 0 && errno == EBUSY) {
 378                         /* could be another device present with the same
 379                          * disk.number. Find and reject any such
 380                          */
 381                         find_reject(mdfd, st, sra, info.disk.number,
 382                                     info.events, verbose, chosen_name);
 383                         err = ioctl(mdfd, ADD_NEW_DISK, &disk);
 384                 }
 385                 if (err < 0) {
 386                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 387                                 devname, chosen_name, strerror(errno));
 388                         close(mdfd);
 389                         return 2;
 390                 }
 391         }
 392         /* 6/ Make sure /var/run/mdadm.map contains this array. */
 393         map_update(&map, devnum,
 394                    info.array.major_version,
 395                    info.array.minor_version,
 396                    info.uuid, chosen_name);
 397
 398         /* 7/ Is there enough devices to possibly start the array? */
 399         /* 7a/ if not, finish with success. */
 400         avail = NULL;
 401         active_disks = count_active(st, mdfd, &avail, &info);
 402         if (enough(info.array.level, info.array.raid_disks,
 403                    info.array.layout, info.array.state & 1,
 404                    avail, active_disks) == 0) {
 405                 free(avail);
 406                 if (verbose >= 0)
 407                         fprintf(stderr, Name
 408                              ": %s attached to %s, not enough to start (%d).\n",
 409                                 devname, chosen_name, active_disks);
 410                 close(mdfd);
 411                 return 0;
 412         }
 413         free(avail);
 414
 415         /* 7b/ if yes, */
 416         /* - if number of OK devices match expected, or -R and there */
 417         /*             are enough, */
 418         /*   + add any bitmap file  */
 419         /*   + start the array (auto-readonly). */
 420 {
 421         mdu_array_info_t ainf;
 422
 423         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 424                 if (verbose >= 0)
 425                         fprintf(stderr, Name
 426                            ": %s attached to %s which is already active.\n",
 427                                 devname, chosen_name);
 428                 close (mdfd);
 429                 return 0;
 430         }
 431 }
 432         if (runstop > 0 || active_disks >= info.array.working_disks) {
 433                 struct mdinfo *sra;
 434                 /* Let's try to start it */
 435                 if (match && match->bitmap_file) {
 436                         int bmfd = open(match->bitmap_file, O_RDWR);
 437                         if (bmfd < 0) {
 438                                 fprintf(stderr, Name
 439                                         ": Could not open bitmap file %s.\n",
 440                                         match->bitmap_file);
 441                                 close(mdfd);
 442                                 return 1;
 443                         }
 444                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 445                                 close(bmfd);
 446                                 fprintf(stderr, Name
 447                                         ": Failed to set bitmapfile for %s.\n",
 448                                         chosen_name);
 449                                 close(mdfd);
 450                                 return 1;
 451                         }
 452                         close(bmfd);
 453                 }
 454                 sra = sysfs_read(mdfd, devnum, 0);
 455                 if (sra == NULL || active_disks >= info.array.working_disks)
 456                         rv = ioctl(mdfd, RUN_ARRAY, NULL);
 457                 else
 458                         rv = sysfs_set_str(sra, NULL,
 459                                            "array_state", "read-auto");
 460                 if (rv == 0) {
 461                         if (verbose >= 0)
 462                                 fprintf(stderr, Name
 463                            ": %s attached to %s, which has been started.\n",
 464                                         devname, chosen_name);
 465                         rv = 0;
 466                 } else {
 467                         fprintf(stderr, Name
 468                              ": %s attached to %s, but failed to start: %s.\n",
 469                                 devname, chosen_name, strerror(errno));
 470                         rv = 1;
 471                 }
 472         } else {
 473                 if (verbose >= 0)
 474                         fprintf(stderr, Name
 475                           ": %s attached to %s, not enough to start safely.\n",
 476                                 devname, chosen_name);
 477                 rv = 0;
 478         }
 479         close(mdfd);
 480         return rv;
 481 }
 482
 483 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
 484                         int number, __u64 events, int verbose,
 485                         char *array_name)
 486 {
 487         /* Find a device attached to this array with a disk.number of number
 488          * and events less than the passed events, and remove the device.
 489          */
 490         struct mdinfo *d;
 491         mdu_array_info_t ra;
 492
 493         if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
 494                 return; /* not safe to remove from active arrays
 495                          * without thinking more */
 496
 497         for (d = sra->devs; d ; d = d->next) {
 498                 char dn[10];
 499                 int dfd;
 500                 struct mdinfo info;
 501                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 502                 dfd = dev_open(dn, O_RDONLY);
 503                 if (dfd < 0)
 504                         continue;
 505                 if (st->ss->load_super(st, dfd, NULL)) {
 506                         close(dfd);
 507                         continue;
 508                 }
 509                 st->ss->getinfo_super(st, &info);
 510                 st->ss->free_super(st);
 511                 close(dfd);
 512
 513                 if (info.disk.number != number ||
 514                     info.events >= events)
 515                         continue;
 516
 517                 if (d->disk.raid_disk > -1)
 518                         sysfs_set_str(sra, d, "slot", "none");
 519                 if (sysfs_set_str(sra, d, "state", "remove") == 0)
 520                         if (verbose >= 0)
 521                                 fprintf(stderr, Name
 522                                         ": removing old device %s from %s\n",
 523                                         d->sys_name+4, array_name);
 524         }
 525 }
 526
 527 static int count_active(struct supertype *st, int mdfd, char **availp,
 528                         struct mdinfo *bestinfo)
 529 {
 530         /* count how many devices in sra think they are active */
 531         struct mdinfo *d;
 532         int cnt = 0, cnt1 = 0;
 533         __u64 max_events = 0;
 534         struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
 535         char *avail = NULL;
 536
 537         for (d = sra->devs ; d ; d = d->next) {
 538                 char dn[30];
 539                 int dfd;
 540                 int ok;
 541                 struct mdinfo info;
 542
 543                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 544                 dfd = dev_open(dn, O_RDONLY);
 545                 if (dfd < 0)
 546                         continue;
 547                 ok =  st->ss->load_super(st, dfd, NULL);
 548                 close(dfd);
 549                 if (ok != 0)
 550                         continue;
 551                 st->ss->getinfo_super(st, &info);
 552                 if (!avail) {
 553                         avail = malloc(info.array.raid_disks);
 554                         if (!avail) {
 555                                 fprintf(stderr, Name ": out of memory.\n");
 556                                 exit(1);
 557                         }
 558                         memset(avail, 0, info.array.raid_disks);
 559                         *availp = avail;
 560                 }
 561
 562                 if (info.disk.state & (1<<MD_DISK_SYNC))
 563                 {
 564                         if (cnt == 0) {
 565                                 cnt++;
 566                                 max_events = info.events;
 567                                 avail[info.disk.raid_disk] = 2;
 568                                 st->ss->getinfo_super(st, bestinfo);
 569                         } else if (info.events == max_events) {
 570                                 cnt++;
 571                                 avail[info.disk.raid_disk] = 2;
 572                         } else if (info.events == max_events-1) {
 573                                 cnt1++;
 574                                 avail[info.disk.raid_disk] = 1;
 575                         } else if (info.events < max_events - 1)
 576                                 ;
 577                         else if (info.events == max_events+1) {
 578                                 int i;
 579                                 cnt1 = cnt;
 580                                 cnt = 1;
 581                                 max_events = info.events;
 582                                 for (i=0; i<info.array.raid_disks; i++)
 583                                         if (avail[i])
 584                                                 avail[i]--;
 585                                 avail[info.disk.raid_disk] = 2;
 586                                 st->ss->getinfo_super(st, bestinfo);
 587                         } else { /* info.events much bigger */
 588                                 cnt = 1; cnt1 = 0;
 589                                 memset(avail, 0, info.disk.raid_disk);
 590                                 max_events = info.events;
 591                                 st->ss->getinfo_super(st, bestinfo);
 592                         }
 593                 }
 594                 st->ss->free_super(st);
 595         }
 596         return cnt + cnt1;
 597 }
 598
 599 void RebuildMap(void)
 600 {
 601         struct mdstat_ent *mdstat = mdstat_read(0, 0);
 602         struct mdstat_ent *md;
 603         struct map_ent *map = NULL;
 604         int mdp = get_mdp_major();
 605
 606         for (md = mdstat ; md ; md = md->next) {
 607                 struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS);
 608                 struct mdinfo *sd;
 609
 610                 for (sd = sra->devs ; sd ; sd = sd->next) {
 611                         char dn[30];
 612                         int dfd;
 613                         int ok;
 614                         struct supertype *st;
 615                         char *path;
 616                         struct mdinfo info;
 617
 618                         sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor);
 619                         dfd = dev_open(dn, O_RDONLY);
 620                         if (dfd < 0)
 621                                 continue;
 622                         st = guess_super(dfd);
 623                         if ( st == NULL)
 624                                 ok = -1;
 625                         else
 626                                 ok = st->ss->load_super(st, dfd, NULL);
 627                         close(dfd);
 628                         if (ok != 0)
 629                                 continue;
 630                         st->ss->getinfo_super(st, &info);
 631                         if (md->devnum > 0)
 632                                 path = map_dev(MD_MAJOR, md->devnum, 0);
 633                         else
 634                                 path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
 635                         map_add(&map, md->devnum, st->ss->major,
 636                                 st->minor_version,
 637                                 info.uuid, path ? : "/unknown");
 638                         st->ss->free_super(st);
 639                         break;
 640                 }
 641         }
 642         map_write(map);
 643         map_free(map);
 644 }
 645
 646 int IncrementalScan(int verbose)
 647 {
 648         /* look at every device listed in the 'map' file.
 649          * If one is found that is not running then:
 650          *  look in mdadm.conf for bitmap file.
 651          *   if one exists, but array has none, add it.
 652          *  try to start array in auto-readonly mode
 653          */
 654         struct map_ent *mapl = NULL;
 655         struct map_ent *me;
 656         mddev_ident_t devs, mddev;
 657         int rv = 0;
 658
 659         map_read(&mapl);
 660         devs = conf_get_ident(NULL);
 661
 662         for (me = mapl ; me ; me = me->next) {
 663                 char path[1024];
 664                 mdu_array_info_t array;
 665                 mdu_bitmap_file_t bmf;
 666                 struct mdinfo *sra;
 667                 int mdfd = open_mddev_devnum(me->path, me->devnum,
 668                                              NULL, path, 0);
 669                 if (mdfd < 0)
 670                         continue;
 671                 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
 672                     errno != ENODEV) {
 673                         close(mdfd);
 674                         continue;
 675                 }
 676                 /* Ok, we can try this one.   Maybe it needs a bitmap */
 677                 for (mddev = devs ; mddev ; mddev = mddev->next)
 678                         if (strcmp(mddev->devname, me->path) == 0)
 679                                 break;
 680                 if (mddev && mddev->bitmap_file) {
 681                         /*
 682                          * Note: early kernels will wrongly fail this, so it
 683                          * is a hint only
 684                          */
 685                         int added = -1;
 686                         if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
 687                                 int bmfd = open(mddev->bitmap_file, O_RDWR);
 688                                 if (bmfd >= 0) {
 689                                         added = ioctl(mdfd, SET_BITMAP_FILE,
 690                                                       bmfd);
 691                                         close(bmfd);
 692                                 }
 693                         }
 694                         if (verbose >= 0) {
 695                                 if (added == 0)
 696                                         fprintf(stderr, Name
 697                                                 ": Added bitmap %s to %s\n",
 698                                                 mddev->bitmap_file, me->path);
 699                                 else if (errno != EEXIST)
 700                                         fprintf(stderr, Name
 701                                            ": Failed to add bitmap to %s: %s\n",
 702                                                 me->path, strerror(errno));
 703                         }
 704                 }
 705                 sra = sysfs_read(mdfd, 0, 0);
 706                 if (sra) {
 707                         if (sysfs_set_str(sra, NULL,
 708                                           "array_state", "read-auto") == 0) {
 709                                 if (verbose >= 0)
 710                                         fprintf(stderr, Name
 711                                                 ": started array %s\n",
 712                                                 me->path);
 713                         } else {
 714                                 fprintf(stderr, Name
 715                                         ": failed to start array %s: %s\n",
 716                                         me->path, strerror(errno));
 717                                 rv = 1;
 718                         }
 719                 }
 720         }
 721         return rv;
 722 }