Incremental.c

   1 /*
   2  * Incremental.c - support --incremental.  Part of:
   3  * mdadm - manage Linux "md" devices aka RAID arrays.
   4  *
   5  * Copyright (C) 2006-2009 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 require_homehost,
  41                 int autof)
  42 {
  43         /* Add this device to an array, creating the array if necessary
  44          * and starting the array if sensible or - if runstop>0 - if possible.
  45          *
  46          * This has several steps:
  47          *
  48          * 1/ Check if device is permitted by mdadm.conf, reject if not.
  49          * 2/ Find metadata, reject if none appropriate (check
  50          *       version/name from args)
  51          * 3/ Check if there is a match in mdadm.conf
  52          * 3a/ if not, check for homehost match.  If no match, assemble as
  53          *    a 'foreign' array.
  54          * 4/ Determine device number.
  55          * - If in mdadm.conf with std name, use that
  56          * - UUID in /var/run/mdadm.map  use that
  57          * - If name is suggestive, use that. unless in use with different uuid.
  58          * - Choose a free, high number.
  59          * - Use a partitioned device unless strong suggestion not to.
  60          *         e.g. auto=md
  61          *   Don't choose partitioned for containers.
  62          * 5/ Find out if array already exists
  63          * 5a/ if it does not
  64          * - choose a name, from mdadm.conf or 'name' field in array.
  65          * - create the array
  66          * - add the device
  67          * 5b/ if it does
  68          * - check one drive in array to make sure metadata is a reasonably
  69          *       close match.  Reject if not (e.g. different type)
  70          * - add the device
  71          * 6/ Make sure /var/run/mdadm.map contains this array.
  72          * 7/ Is there enough devices to possibly start the array?
  73          *     For a container, this means running Incremental_container.
  74          * 7a/ if not, finish with success.
  75          * 7b/ if yes,
  76          * - read all metadata and arrange devices like -A does
  77          * - if number of OK devices match expected, or -R and there are enough,
  78          *   start the array (auto-readonly).
  79          */
  80         struct stat stb;
  81         struct mdinfo info;
  82         struct mddev_ident_s *array_list, *match;
  83         char chosen_name[1024];
  84         int rv;
  85         struct map_ent *mp, *map = NULL;
  86         int dfd, mdfd;
  87         char *avail;
  88         int active_disks;
  89         int trustworthy = FOREIGN;
  90         char *name_to_use;
  91         mdu_array_info_t ainf;
  92
  93         struct createinfo *ci = conf_get_create_info();
  94
  95
  96         /* 1/ Check if device is permitted by mdadm.conf */
  97
  98         if (!conf_test_dev(devname)) {
  99                 if (verbose >= 0)
 100                         fprintf(stderr, Name
 101                                 ": %s not permitted by mdadm.conf.\n",
 102                                 devname);
 103                 return 1;
 104         }
 105
 106         /* 2/ Find metadata, reject if none appropriate (check
 107          *            version/name from args) */
 108
 109         dfd = dev_open(devname, O_RDONLY|O_EXCL);
 110         if (dfd < 0) {
 111                 if (verbose >= 0)
 112                         fprintf(stderr, Name ": cannot open %s: %s.\n",
 113                                 devname, strerror(errno));
 114                 return 1;
 115         }
 116         if (fstat(dfd, &stb) < 0) {
 117                 if (verbose >= 0)
 118                         fprintf(stderr, Name ": fstat failed for %s: %s.\n",
 119                                 devname, strerror(errno));
 120                 close(dfd);
 121                 return 1;
 122         }
 123         if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 124                 if (verbose >= 0)
 125                         fprintf(stderr, Name ": %s is not a block device.\n",
 126                                 devname);
 127                 close(dfd);
 128                 return 1;
 129         }
 130
 131         if (st == NULL && (st = guess_super(dfd)) == NULL) {
 132                 if (verbose >= 0)
 133                         fprintf(stderr, Name
 134                                 ": no recognisable superblock on %s.\n",
 135                                 devname);
 136                 close(dfd);
 137                 return 1;
 138         }
 139         if (st->ss->load_super(st, dfd, NULL)) {
 140                 if (verbose >= 0)
 141                         fprintf(stderr, Name ": no RAID superblock on %s.\n",
 142                                 devname);
 143                 close(dfd);
 144                 return 1;
 145         }
 146         close (dfd);
 147
 148         memset(&info, 0, sizeof(info));
 149         st->ss->getinfo_super(st, &info);
 150         /* 3/ Check if there is a match in mdadm.conf */
 151
 152         array_list = conf_get_ident(NULL);
 153         match = NULL;
 154         for (; array_list; array_list = array_list->next) {
 155                 if (array_list->uuid_set &&
 156                     same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
 157                     == 0) {
 158                         if (verbose >= 2 && array_list->devname)
 159                                 fprintf(stderr, Name
 160                                         ": UUID differs from %s.\n",
 161                                         array_list->devname);
 162                         continue;
 163                 }
 164                 if (array_list->name[0] &&
 165                     strcasecmp(array_list->name, info.name) != 0) {
 166                         if (verbose >= 2 && array_list->devname)
 167                                 fprintf(stderr, Name
 168                                         ": Name differs from %s.\n",
 169                                         array_list->devname);
 170                         continue;
 171                 }
 172                 if (array_list->devices &&
 173                     !match_oneof(array_list->devices, devname)) {
 174                         if (verbose >= 2 && array_list->devname)
 175                                 fprintf(stderr, Name
 176                                         ": Not a listed device for %s.\n",
 177                                         array_list->devname);
 178                         continue;
 179                 }
 180                 if (array_list->super_minor != UnSet &&
 181                     array_list->super_minor != info.array.md_minor) {
 182                         if (verbose >= 2 && array_list->devname)
 183                                 fprintf(stderr, Name
 184                                         ": Different super-minor to %s.\n",
 185                                         array_list->devname);
 186                         continue;
 187                 }
 188                 if (!array_list->uuid_set &&
 189                     !array_list->name[0] &&
 190                     !array_list->devices &&
 191                     array_list->super_minor == UnSet) {
 192                         if (verbose >= 2 && array_list->devname)
 193                                 fprintf(stderr, Name
 194                              ": %s doesn't have any identifying information.\n",
 195                                         array_list->devname);
 196                         continue;
 197                 }
 198                 /* FIXME, should I check raid_disks and level too?? */
 199
 200                 if (match) {
 201                         if (verbose >= 0) {
 202                                 if (match->devname && array_list->devname)
 203                                         fprintf(stderr, Name
 204                    ": we match both %s and %s - cannot decide which to use.\n",
 205                                                 match->devname, array_list->devname);
 206                                 else
 207                                         fprintf(stderr, Name
 208                                                 ": multiple lines in mdadm.conf match\n");
 209                         }
 210                         return 2;
 211                 }
 212                 match = array_list;
 213         }
 214
 215         if (match && match->devname
 216             && strcasecmp(match->devname, "<ignore>") == 0) {
 217                 if (verbose >= 0)
 218                         fprintf(stderr, Name ": array containing %s is explicitly"
 219                                 " ignored by mdadm.conf\n",
 220                                 devname);
 221                 return 1;
 222         }
 223
 224         /* 3a/ if not, check for homehost match.  If no match, continue
 225          * but don't trust the 'name' in the array. Thus a 'random' minor
 226          * number will be assigned, and the device name will be based
 227          * on that. */
 228         if (match)
 229                 trustworthy = LOCAL;
 230         else if (st->ss->match_home(st, homehost) == 1)
 231                 trustworthy = LOCAL;
 232         else if (st->ss->match_home(st, "any") == 1)
 233                 trustworthy = LOCAL_ANY;
 234         else
 235                 trustworthy = FOREIGN;
 236
 237
 238         if (!match && !conf_test_metadata(st->ss->name,
 239                                           (trustworthy == LOCAL))) {
 240                 if (verbose >= 1)
 241                         fprintf(stderr, Name
 242                                 ": %s has metadata type %s for which "
 243                                 "auto-assembly is disabled\n",
 244                                 devname, st->ss->name);
 245                 return 1;
 246         }
 247         if (trustworthy == LOCAL_ANY)
 248                 trustworthy = LOCAL;
 249
 250         /* There are three possible sources for 'autof':  command line,
 251          * ARRAY line in mdadm.conf, or CREATE line in mdadm.conf.
 252          * ARRAY takes precedence, then command line, then
 253          * CREATE.
 254          */
 255         if (match && match->autof)
 256                 autof = match->autof;
 257         if (autof == 0)
 258                 autof = ci->autof;
 259
 260         if (st->ss->container_content && st->loaded_container) {
 261                 if ((runstop > 0 && info.container_enough >= 0) ||
 262                     info.container_enough > 0)
 263                         /* pass */;
 264                 else {
 265                         if (verbose)
 266                                 fprintf(stderr, Name ": not enough devices to start the container\n");
 267                         return 0;
 268                 }
 269
 270                 /* This is a pre-built container array, so we do something
 271                  * rather different.
 272                  */
 273                 return Incremental_container(st, devname, verbose, runstop,
 274                                              autof, trustworthy);
 275         }
 276
 277         name_to_use = info.name;
 278         if (name_to_use[0] == 0 &&
 279             info.array.level == LEVEL_CONTAINER &&
 280             trustworthy == LOCAL) {
 281                 name_to_use = info.text_version;
 282                 trustworthy = METADATA;
 283         }
 284         if (name_to_use[0] && trustworthy != LOCAL &&
 285             ! require_homehost &&
 286             conf_name_is_free(name_to_use))
 287                 trustworthy = LOCAL;
 288
 289         /* strip "hostname:" prefix from name if we have decided
 290          * to treat it as LOCAL
 291          */
 292         if (trustworthy == LOCAL && strchr(name_to_use, ':') != NULL)
 293                 name_to_use = strchr(name_to_use, ':')+1;
 294
 295         /* 4/ Check if array exists.
 296          */
 297         if (map_lock(&map))
 298                 fprintf(stderr, Name ": failed to get exclusive lock on "
 299                         "mapfile\n");
 300         mp = map_by_uuid(&map, info.uuid);
 301         if (mp)
 302                 mdfd = open_dev(mp->devnum);
 303         else
 304                 mdfd = -1;
 305
 306         if (mdfd < 0) {
 307                 struct mdinfo *sra;
 308                 struct mdinfo dinfo;
 309
 310                 /* Couldn't find an existing array, maybe make a new one */
 311                 mdfd = create_mddev(match ? match->devname : NULL,
 312                                     name_to_use, autof, trustworthy, chosen_name);
 313
 314                 if (mdfd < 0)
 315                         return 1;
 316
 317                 sysfs_init(&info, mdfd, 0);
 318
 319                 if (set_array_info(mdfd, st, &info) != 0) {
 320                         fprintf(stderr, Name ": failed to set array info for %s: %s\n",
 321                                 chosen_name, strerror(errno));
 322                         close(mdfd);
 323                         return 2;
 324                 }
 325
 326                 dinfo = info;
 327                 dinfo.disk.major = major(stb.st_rdev);
 328                 dinfo.disk.minor = minor(stb.st_rdev);
 329                 if (add_disk(mdfd, st, &info, &dinfo) != 0) {
 330                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 331                                 devname, chosen_name, strerror(errno));
 332                         ioctl(mdfd, STOP_ARRAY, 0);
 333                         close(mdfd);
 334                         return 2;
 335                 }
 336                 sra = sysfs_read(mdfd, fd2devnum(mdfd), GET_DEVS);
 337                 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
 338                         /* It really should be 'none' - must be old buggy
 339                          * kernel, and mdadm -I may not be able to complete.
 340                          * So reject it.
 341                          */
 342                         ioctl(mdfd, STOP_ARRAY, NULL);
 343                         fprintf(stderr, Name
 344                       ": You have an old buggy kernel which cannot support\n"
 345                                 "      --incremental reliably.  Aborting.\n");
 346                         close(mdfd);
 347                         sysfs_free(sra);
 348                         return 2;
 349                 }
 350                 info.array.working_disks = 1;
 351                 sysfs_free(sra);
 352                 /* 6/ Make sure /var/run/mdadm.map contains this array. */
 353                 map_update(&map, fd2devnum(mdfd),
 354                            info.text_version,
 355                            info.uuid, chosen_name);
 356         } else {
 357         /* 5b/ if it does */
 358         /* - check one drive in array to make sure metadata is a reasonably */
 359         /*        close match.  Reject if not (e.g. different type) */
 360         /* - add the device */
 361                 char dn[20];
 362                 int dfd2;
 363                 int err;
 364                 struct mdinfo *sra;
 365                 struct supertype *st2;
 366                 struct mdinfo info2, *d;
 367
 368                 if (mp->path)
 369                         strcpy(chosen_name, mp->path);
 370                 else
 371                         strcpy(chosen_name, devnum2devname(mp->devnum));
 372
 373                 /* It is generally not OK to add non-spare drives to a
 374                  * running array as they are probably missing because
 375                  * they failed.  However if runstop is 1, then the
 376                  * array was possibly started early and our best be is
 377                  * to add this anyway.  It would probably be good to
 378                  * allow explicit policy statement about this.
 379                  */
 380                 if ((info.disk.state & (1<<MD_DISK_SYNC)) != 0
 381                     && runstop < 1) {
 382                         int active = 0;
 383
 384                         if (st->ss->external) {
 385                                 char *devname = devnum2devname(fd2devnum(mdfd));
 386
 387                                 active = devname && is_container_active(devname);
 388                                 free(devname);
 389                         } else if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0)
 390                                 active = 1;
 391                         if (active) {
 392                                 fprintf(stderr, Name
 393                                         ": not adding %s to active array (without --run) %s\n",
 394                                         devname, chosen_name);
 395                                 close(mdfd);
 396                                 return 2;
 397                         }
 398                 }
 399                 sra = sysfs_read(mdfd, fd2devnum(mdfd), (GET_DEVS | GET_STATE));
 400                 if (!sra)
 401                         return 2;
 402
 403                 if (sra->devs) {
 404                         sprintf(dn, "%d:%d", sra->devs->disk.major,
 405                                 sra->devs->disk.minor);
 406                         dfd2 = dev_open(dn, O_RDONLY);
 407                         st2 = dup_super(st);
 408                         if (st2->ss->load_super(st2, dfd2, NULL) ||
 409                             st->ss->compare_super(st, st2) != 0) {
 410                                 fprintf(stderr, Name
 411                                         ": metadata mismatch between %s and "
 412                                         "chosen array %s\n",
 413                                         devname, chosen_name);
 414                                 close(mdfd);
 415                                 close(dfd2);
 416                                 return 2;
 417                         }
 418                         close(dfd2);
 419                         memset(&info2, 0, sizeof(info2));
 420                         st2->ss->getinfo_super(st2, &info2);
 421                         st2->ss->free_super(st2);
 422                         if (info.array.level != info2.array.level ||
 423                             memcmp(info.uuid, info2.uuid, 16) != 0 ||
 424                             info.array.raid_disks != info2.array.raid_disks) {
 425                                 fprintf(stderr, Name
 426                                         ": unexpected difference between %s and %s.\n",
 427                                         chosen_name, devname);
 428                                 close(mdfd);
 429                                 return 2;
 430                         }
 431                 }
 432                 info2.disk.major = major(stb.st_rdev);
 433                 info2.disk.minor = minor(stb.st_rdev);
 434                 /* add disk needs to know about containers */
 435                 if (st->ss->external)
 436                         sra->array.level = LEVEL_CONTAINER;
 437                 err = add_disk(mdfd, st, sra, &info2);
 438                 if (err < 0 && errno == EBUSY) {
 439                         /* could be another device present with the same
 440                          * disk.number. Find and reject any such
 441                          */
 442                         find_reject(mdfd, st, sra, info.disk.number,
 443                                     info.events, verbose, chosen_name);
 444                         err = add_disk(mdfd, st, sra, &info2);
 445                 }
 446                 if (err < 0) {
 447                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 448                                 devname, chosen_name, strerror(errno));
 449                         close(mdfd);
 450                         return 2;
 451                 }
 452                 info.array.working_disks = 0;
 453                 for (d = sra->devs; d; d=d->next)
 454                         info.array.working_disks ++;
 455
 456         }
 457
 458         /* 7/ Is there enough devices to possibly start the array? */
 459         /* 7a/ if not, finish with success. */
 460         if (info.array.level == LEVEL_CONTAINER) {
 461                 /* Try to assemble within the container */
 462                 map_unlock(&map);
 463                 sysfs_uevent(&info, "change");
 464                 if (verbose >= 0)
 465                         fprintf(stderr, Name
 466                                 ": container %s now has %d devices\n",
 467                                 chosen_name, info.array.working_disks);
 468                 wait_for(chosen_name, mdfd);
 469                 close(mdfd);
 470                 rv = Incremental(chosen_name, verbose, runstop,
 471                                  NULL, homehost, require_homehost, autof);
 472                 if (rv == 1)
 473                         /* Don't fail the whole -I if a subarray didn't
 474                          * have enough devices to start yet
 475                          */
 476                         rv = 0;
 477                 return rv;
 478         }
 479         avail = NULL;
 480         active_disks = count_active(st, mdfd, &avail, &info);
 481         if (enough(info.array.level, info.array.raid_disks,
 482                    info.array.layout, info.array.state & 1,
 483                    avail, active_disks) == 0) {
 484                 free(avail);
 485                 if (verbose >= 0)
 486                         fprintf(stderr, Name
 487                              ": %s attached to %s, not enough to start (%d).\n",
 488                                 devname, chosen_name, active_disks);
 489                 map_unlock(&map);
 490                 close(mdfd);
 491                 return 0;
 492         }
 493         free(avail);
 494
 495         /* 7b/ if yes, */
 496         /* - if number of OK devices match expected, or -R and there */
 497         /*             are enough, */
 498         /*   + add any bitmap file  */
 499         /*   + start the array (auto-readonly). */
 500
 501         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 502                 if (verbose >= 0)
 503                         fprintf(stderr, Name
 504                            ": %s attached to %s which is already active.\n",
 505                                 devname, chosen_name);
 506                 close(mdfd);
 507                 map_unlock(&map);
 508                 return 0;
 509         }
 510
 511         map_unlock(&map);
 512         if (runstop > 0 || active_disks >= info.array.working_disks) {
 513                 struct mdinfo *sra;
 514                 /* Let's try to start it */
 515                 if (match && match->bitmap_file) {
 516                         int bmfd = open(match->bitmap_file, O_RDWR);
 517                         if (bmfd < 0) {
 518                                 fprintf(stderr, Name
 519                                         ": Could not open bitmap file %s.\n",
 520                                         match->bitmap_file);
 521                                 close(mdfd);
 522                                 return 1;
 523                         }
 524                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 525                                 close(bmfd);
 526                                 fprintf(stderr, Name
 527                                         ": Failed to set bitmapfile for %s.\n",
 528                                         chosen_name);
 529                                 close(mdfd);
 530                                 return 1;
 531                         }
 532                         close(bmfd);
 533                 }
 534                 sra = sysfs_read(mdfd, fd2devnum(mdfd), 0);
 535                 if ((sra == NULL || active_disks >= info.array.working_disks)
 536                     && trustworthy != FOREIGN)
 537                         rv = ioctl(mdfd, RUN_ARRAY, NULL);
 538                 else
 539                         rv = sysfs_set_str(sra, NULL,
 540                                            "array_state", "read-auto");
 541                 if (rv == 0) {
 542                         if (verbose >= 0)
 543                                 fprintf(stderr, Name
 544                            ": %s attached to %s, which has been started.\n",
 545                                         devname, chosen_name);
 546                         rv = 0;
 547                         wait_for(chosen_name, mdfd);
 548                 } else {
 549                         fprintf(stderr, Name
 550                              ": %s attached to %s, but failed to start: %s.\n",
 551                                 devname, chosen_name, strerror(errno));
 552                         rv = 1;
 553                 }
 554         } else {
 555                 if (verbose >= 0)
 556                         fprintf(stderr, Name
 557                           ": %s attached to %s, not enough to start safely.\n",
 558                                 devname, chosen_name);
 559                 rv = 0;
 560         }
 561         close(mdfd);
 562         return rv;
 563 }
 564
 565 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
 566                         int number, __u64 events, int verbose,
 567                         char *array_name)
 568 {
 569         /* Find a device attached to this array with a disk.number of number
 570          * and events less than the passed events, and remove the device.
 571          */
 572         struct mdinfo *d;
 573         mdu_array_info_t ra;
 574
 575         if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
 576                 return; /* not safe to remove from active arrays
 577                          * without thinking more */
 578
 579         for (d = sra->devs; d ; d = d->next) {
 580                 char dn[10];
 581                 int dfd;
 582                 struct mdinfo info;
 583                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 584                 dfd = dev_open(dn, O_RDONLY);
 585                 if (dfd < 0)
 586                         continue;
 587                 if (st->ss->load_super(st, dfd, NULL)) {
 588                         close(dfd);
 589                         continue;
 590                 }
 591                 st->ss->getinfo_super(st, &info);
 592                 st->ss->free_super(st);
 593                 close(dfd);
 594
 595                 if (info.disk.number != number ||
 596                     info.events >= events)
 597                         continue;
 598
 599                 if (d->disk.raid_disk > -1)
 600                         sysfs_set_str(sra, d, "slot", "none");
 601                 if (sysfs_set_str(sra, d, "state", "remove") == 0)
 602                         if (verbose >= 0)
 603                                 fprintf(stderr, Name
 604                                         ": removing old device %s from %s\n",
 605                                         d->sys_name+4, array_name);
 606         }
 607 }
 608
 609 static int count_active(struct supertype *st, int mdfd, char **availp,
 610                         struct mdinfo *bestinfo)
 611 {
 612         /* count how many devices in sra think they are active */
 613         struct mdinfo *d;
 614         int cnt = 0, cnt1 = 0;
 615         __u64 max_events = 0;
 616         struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
 617         char *avail = NULL;
 618
 619         if (!sra)
 620                 return 0;
 621
 622         for (d = sra->devs ; d ; d = d->next) {
 623                 char dn[30];
 624                 int dfd;
 625                 int ok;
 626                 struct mdinfo info;
 627
 628                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 629                 dfd = dev_open(dn, O_RDONLY);
 630                 if (dfd < 0)
 631                         continue;
 632                 ok =  st->ss->load_super(st, dfd, NULL);
 633                 close(dfd);
 634                 if (ok != 0)
 635                         continue;
 636                 st->ss->getinfo_super(st, &info);
 637                 if (!avail) {
 638                         avail = malloc(info.array.raid_disks);
 639                         if (!avail) {
 640                                 fprintf(stderr, Name ": out of memory.\n");
 641                                 exit(1);
 642                         }
 643                         memset(avail, 0, info.array.raid_disks);
 644                         *availp = avail;
 645                 }
 646
 647                 if (info.disk.state & (1<<MD_DISK_SYNC))
 648                 {
 649                         if (cnt == 0) {
 650                                 cnt++;
 651                                 max_events = info.events;
 652                                 avail[info.disk.raid_disk] = 2;
 653                                 st->ss->getinfo_super(st, bestinfo);
 654                         } else if (info.events == max_events) {
 655                                 cnt++;
 656                                 avail[info.disk.raid_disk] = 2;
 657                         } else if (info.events == max_events-1) {
 658                                 cnt1++;
 659                                 avail[info.disk.raid_disk] = 1;
 660                         } else if (info.events < max_events - 1)
 661                                 ;
 662                         else if (info.events == max_events+1) {
 663                                 int i;
 664                                 cnt1 = cnt;
 665                                 cnt = 1;
 666                                 max_events = info.events;
 667                                 for (i=0; i<info.array.raid_disks; i++)
 668                                         if (avail[i])
 669                                                 avail[i]--;
 670                                 avail[info.disk.raid_disk] = 2;
 671                                 st->ss->getinfo_super(st, bestinfo);
 672                         } else { /* info.events much bigger */
 673                                 cnt = 1; cnt1 = 0;
 674                                 memset(avail, 0, info.disk.raid_disk);
 675                                 max_events = info.events;
 676                                 st->ss->getinfo_super(st, bestinfo);
 677                         }
 678                 }
 679                 st->ss->free_super(st);
 680         }
 681         return cnt + cnt1;
 682 }
 683
 684 int IncrementalScan(int verbose)
 685 {
 686         /* look at every device listed in the 'map' file.
 687          * If one is found that is not running then:
 688          *  look in mdadm.conf for bitmap file.
 689          *   if one exists, but array has none, add it.
 690          *  try to start array in auto-readonly mode
 691          */
 692         struct map_ent *mapl = NULL;
 693         struct map_ent *me;
 694         mddev_ident_t devs, mddev;
 695         int rv = 0;
 696
 697         map_read(&mapl);
 698         devs = conf_get_ident(NULL);
 699
 700         for (me = mapl ; me ; me = me->next) {
 701                 mdu_array_info_t array;
 702                 mdu_bitmap_file_t bmf;
 703                 struct mdinfo *sra;
 704                 int mdfd = open_dev(me->devnum);
 705
 706                 if (mdfd < 0)
 707                         continue;
 708                 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
 709                     errno != ENODEV) {
 710                         close(mdfd);
 711                         continue;
 712                 }
 713                 /* Ok, we can try this one.   Maybe it needs a bitmap */
 714                 for (mddev = devs ; mddev ; mddev = mddev->next)
 715                         if (mddev->devname && me->path
 716                             && devname_matches(mddev->devname, me->path))
 717                                 break;
 718                 if (mddev && mddev->bitmap_file) {
 719                         /*
 720                          * Note: early kernels will wrongly fail this, so it
 721                          * is a hint only
 722                          */
 723                         int added = -1;
 724                         if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
 725                                 int bmfd = open(mddev->bitmap_file, O_RDWR);
 726                                 if (bmfd >= 0) {
 727                                         added = ioctl(mdfd, SET_BITMAP_FILE,
 728                                                       bmfd);
 729                                         close(bmfd);
 730                                 }
 731                         }
 732                         if (verbose >= 0) {
 733                                 if (added == 0)
 734                                         fprintf(stderr, Name
 735                                                 ": Added bitmap %s to %s\n",
 736                                                 mddev->bitmap_file, me->path);
 737                                 else if (errno != EEXIST)
 738                                         fprintf(stderr, Name
 739                                            ": Failed to add bitmap to %s: %s\n",
 740                                                 me->path, strerror(errno));
 741                         }
 742                 }
 743                 sra = sysfs_read(mdfd, 0, 0);
 744                 if (sra) {
 745                         if (sysfs_set_str(sra, NULL,
 746                                           "array_state", "read-auto") == 0) {
 747                                 if (verbose >= 0)
 748                                         fprintf(stderr, Name
 749                                                 ": started array %s\n",
 750                                                 me->path ?: devnum2devname(me->devnum));
 751                         } else {
 752                                 fprintf(stderr, Name
 753                                         ": failed to start array %s: %s\n",
 754                                         me->path ?: devnum2devname(me->devnum),
 755                                         strerror(errno));
 756                                 rv = 1;
 757                         }
 758                 }
 759         }
 760         return rv;
 761 }
 762
 763 static char *container2devname(char *devname)
 764 {
 765         char *mdname = NULL;
 766
 767         if (devname[0] == '/') {
 768                 int fd = open(devname, O_RDONLY);
 769                 if (fd >= 0) {
 770                         mdname = devnum2devname(fd2devnum(fd));
 771                         close(fd);
 772                 }
 773         } else {
 774                 int uuid[4];
 775                 struct map_ent *mp, *map = NULL;
 776
 777                 if (!parse_uuid(devname, uuid))
 778                         return mdname;
 779                 mp = map_by_uuid(&map, uuid);
 780                 if (mp)
 781                         mdname = devnum2devname(mp->devnum);
 782                 map_free(map);
 783         }
 784
 785         return mdname;
 786 }
 787
 788 int Incremental_container(struct supertype *st, char *devname, int verbose,
 789                           int runstop, int autof, int trustworthy)
 790 {
 791         /* Collect the contents of this container and for each
 792          * array, choose a device name and assemble the array.
 793          */
 794
 795         struct mdinfo *list = st->ss->container_content(st);
 796         struct mdinfo *ra;
 797         struct map_ent *map = NULL;
 798
 799         if (map_lock(&map))
 800                 fprintf(stderr, Name ": failed to get exclusive lock on "
 801                         "mapfile\n");
 802
 803         for (ra = list ; ra ; ra = ra->next) {
 804                 int mdfd;
 805                 char chosen_name[1024];
 806                 struct map_ent *mp;
 807                 struct mddev_ident_s *match = NULL;
 808
 809                 mp = map_by_uuid(&map, ra->uuid);
 810
 811                 if (mp) {
 812                         mdfd = open_dev(mp->devnum);
 813                         if (mp->path)
 814                                 strcpy(chosen_name, mp->path);
 815                         else
 816                                 strcpy(chosen_name, devnum2devname(mp->devnum));
 817                 } else {
 818
 819                         /* Check in mdadm.conf for container == devname and
 820                          * member == ra->text_version after second slash.
 821                          */
 822                         char *sub = strchr(ra->text_version+1, '/');
 823                         struct mddev_ident_s *array_list;
 824                         if (sub) {
 825                                 sub++;
 826                                 array_list = conf_get_ident(NULL);
 827                         } else
 828                                 array_list = NULL;
 829                         for(; array_list ; array_list = array_list->next) {
 830                                 char *dn;
 831                                 if (array_list->member == NULL ||
 832                                     array_list->container == NULL)
 833                                         continue;
 834                                 if (strcmp(array_list->member, sub) != 0)
 835                                         continue;
 836                                 if (array_list->uuid_set &&
 837                                     !same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
 838                                         continue;
 839                                 dn = container2devname(array_list->container);
 840                                 if (dn == NULL)
 841                                         continue;
 842                                 if (strncmp(dn, ra->text_version+1,
 843                                             strlen(dn)) != 0 ||
 844                                     ra->text_version[strlen(dn)+1] != '/') {
 845                                         free(dn);
 846                                         continue;
 847                                 }
 848                                 free(dn);
 849                                 /* we have a match */
 850                                 match = array_list;
 851                                 if (verbose>0)
 852                                         fprintf(stderr, Name ": match found for member %s\n",
 853                                                 array_list->member);
 854                                 break;
 855                         }
 856
 857                         if (match && match->devname &&
 858                             strcasecmp(match->devname, "<ignore>") == 0) {
 859                                 if (verbose > 0)
 860                                         fprintf(stderr, Name ": array %s/%s is "
 861                                                 "explicitly ignored by mdadm.conf\n",
 862                                                 match->container, match->member);
 863                                 return 2;
 864                         }
 865                         if (match)
 866                                 trustworthy = LOCAL;
 867
 868                         mdfd = create_mddev(match ? match->devname : NULL,
 869                                             ra->name,
 870                                             autof,
 871                                             trustworthy,
 872                                             chosen_name);
 873                 }
 874
 875                 if (mdfd < 0) {
 876                         fprintf(stderr, Name ": failed to open %s: %s.\n",
 877                                 chosen_name, strerror(errno));
 878                         return 2;
 879                 }
 880
 881                 assemble_container_content(st, mdfd, ra, runstop,
 882                                            chosen_name, verbose);
 883         }
 884         map_unlock(&map);
 885         return 0;
 886 }
 887
 888 /*
 889  * IncrementalRemove - Attempt to see if the passed in device belongs to any
 890  * raid arrays, and if so first fail (if needed) and then remove the device.
 891  *
 892  * @devname - The device we want to remove
 893  *
 894  * Note: the device name must be a kernel name like "sda", so
 895  * that we can find it in /proc/mdstat
 896  */
 897 int IncrementalRemove(char *devname, int verbose)
 898 {
 899         int mdfd;
 900         int rv;
 901         struct mdstat_ent *ent;
 902         struct mddev_dev_s devlist;
 903
 904         if (strchr(devname, '/')) {
 905                 fprintf(stderr, Name ": incremental removal requires a "
 906                         "kernel device name, not a file: %s\n", devname);
 907                 return 1;
 908         }
 909         ent = mdstat_by_component(devname);
 910         if (!ent) {
 911                 fprintf(stderr, Name ": %s does not appear to be a component "
 912                         "of any array\n", devname);
 913                 return 1;
 914         }
 915         mdfd = open_dev(ent->devnum);
 916         if (mdfd < 0) {
 917                 fprintf(stderr, Name ": Cannot open array %s!!\n", ent->dev);
 918                 return 1;
 919         }
 920         memset(&devlist, 0, sizeof(devlist));
 921         devlist.devname = devname;
 922         devlist.disposition = 'f';
 923         Manage_subdevs(ent->dev, mdfd, &devlist, verbose, 0);
 924         devlist.disposition = 'r';
 925         rv = Manage_subdevs(ent->dev, mdfd, &devlist, verbose, 0);
 926         close(mdfd);
 927         return rv;
 928 }