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 1;
 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         map_lock(&map);
 298         mp = map_by_uuid(&map, info.uuid);
 299         if (mp)
 300                 mdfd = open_dev(mp->devnum);
 301         else
 302                 mdfd = -1;
 303
 304         if (mdfd < 0) {
 305                 struct mdinfo *sra;
 306                 struct mdinfo dinfo;
 307
 308                 /* Couldn't find an existing array, maybe make a new one */
 309                 mdfd = create_mddev(match ? match->devname : NULL,
 310                                     name_to_use, autof, trustworthy, chosen_name);
 311
 312                 if (mdfd < 0)
 313                         return 1;
 314
 315                 sysfs_init(&info, mdfd, 0);
 316
 317                 if (set_array_info(mdfd, st, &info) != 0) {
 318                         fprintf(stderr, Name ": failed to set array info for %s: %s\n",
 319                                 chosen_name, strerror(errno));
 320                         close(mdfd);
 321                         return 2;
 322                 }
 323
 324                 dinfo = info;
 325                 dinfo.disk.major = major(stb.st_rdev);
 326                 dinfo.disk.minor = minor(stb.st_rdev);
 327                 if (add_disk(mdfd, st, &info, &dinfo) != 0) {
 328                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 329                                 devname, chosen_name, strerror(errno));
 330                         ioctl(mdfd, STOP_ARRAY, 0);
 331                         close(mdfd);
 332                         return 2;
 333                 }
 334                 sra = sysfs_read(mdfd, fd2devnum(mdfd), GET_DEVS);
 335                 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
 336                         /* It really should be 'none' - must be old buggy
 337                          * kernel, and mdadm -I may not be able to complete.
 338                          * So reject it.
 339                          */
 340                         ioctl(mdfd, STOP_ARRAY, NULL);
 341                         fprintf(stderr, Name
 342                       ": You have an old buggy kernel which cannot support\n"
 343                                 "      --incremental reliably.  Aborting.\n");
 344                         close(mdfd);
 345                         sysfs_free(sra);
 346                         return 2;
 347                 }
 348                 info.array.working_disks = 1;
 349                 sysfs_free(sra);
 350                 /* 6/ Make sure /var/run/mdadm.map contains this array. */
 351                 map_update(&map, fd2devnum(mdfd),
 352                            info.text_version,
 353                            info.uuid, chosen_name);
 354         } else {
 355         /* 5b/ if it does */
 356         /* - check one drive in array to make sure metadata is a reasonably */
 357         /*        close match.  Reject if not (e.g. different type) */
 358         /* - add the device */
 359                 char dn[20];
 360                 int dfd2;
 361                 int err;
 362                 struct mdinfo *sra;
 363                 struct supertype *st2;
 364                 struct mdinfo info2, *d;
 365
 366                 if (mp->path)
 367                         strcpy(chosen_name, mp->path);
 368                 else
 369                         strcpy(chosen_name, devnum2devname(mp->devnum));
 370
 371                 /* It is generally not OK to add drives to a running array
 372                  * as they are probably missing because they failed.
 373                  * However if runstop is 1, then the array was possibly
 374                  * started early and our best be is to add this anyway.
 375                  * It would probably be good to allow explicit policy
 376                  * statement about this.
 377                  */
 378                 if (runstop < 1) {
 379                         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 380                                 fprintf(stderr, Name
 381                                         ": not adding %s to active array (without --run) %s\n",
 382                                         devname, chosen_name);
 383                                 close(mdfd);
 384                                 return 2;
 385                         }
 386                 }
 387                 sra = sysfs_read(mdfd, fd2devnum(mdfd), (GET_DEVS | GET_STATE));
 388
 389                 if (sra->devs) {
 390                         sprintf(dn, "%d:%d", sra->devs->disk.major,
 391                                 sra->devs->disk.minor);
 392                         dfd2 = dev_open(dn, O_RDONLY);
 393                         st2 = dup_super(st);
 394                         if (st2->ss->load_super(st2, dfd2, NULL) ||
 395                             st->ss->compare_super(st, st2) != 0) {
 396                                 fprintf(stderr, Name
 397                                         ": metadata mismatch between %s and "
 398                                         "chosen array %s\n",
 399                                         devname, chosen_name);
 400                                 close(mdfd);
 401                                 close(dfd2);
 402                                 return 2;
 403                         }
 404                         close(dfd2);
 405                         memset(&info2, 0, sizeof(info2));
 406                         st2->ss->getinfo_super(st2, &info2);
 407                         st2->ss->free_super(st2);
 408                         if (info.array.level != info2.array.level ||
 409                             memcmp(info.uuid, info2.uuid, 16) != 0 ||
 410                             info.array.raid_disks != info2.array.raid_disks) {
 411                                 fprintf(stderr, Name
 412                                         ": unexpected difference between %s and %s.\n",
 413                                         chosen_name, devname);
 414                                 close(mdfd);
 415                                 return 2;
 416                         }
 417                 }
 418                 info2.disk.major = major(stb.st_rdev);
 419                 info2.disk.minor = minor(stb.st_rdev);
 420                 /* add disk needs to know about containers */
 421                 if (st->ss->external)
 422                         sra->array.level = LEVEL_CONTAINER;
 423                 err = add_disk(mdfd, st, sra, &info2);
 424                 if (err < 0 && errno == EBUSY) {
 425                         /* could be another device present with the same
 426                          * disk.number. Find and reject any such
 427                          */
 428                         find_reject(mdfd, st, sra, info.disk.number,
 429                                     info.events, verbose, chosen_name);
 430                         err = add_disk(mdfd, st, sra, &info2);
 431                 }
 432                 if (err < 0) {
 433                         fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
 434                                 devname, chosen_name, strerror(errno));
 435                         close(mdfd);
 436                         return 2;
 437                 }
 438                 info.array.working_disks = 0;
 439                 for (d = sra->devs; d; d=d->next)
 440                         info.array.working_disks ++;
 441
 442         }
 443
 444         /* 7/ Is there enough devices to possibly start the array? */
 445         /* 7a/ if not, finish with success. */
 446         if (info.array.level == LEVEL_CONTAINER) {
 447                 /* Try to assemble within the container */
 448                 map_unlock(&map);
 449                 sysfs_uevent(&info, "change");
 450                 if (verbose >= 0)
 451                         fprintf(stderr, Name
 452                                 ": container %s now has %d devices\n",
 453                                 chosen_name, info.array.working_disks);
 454                 wait_for(chosen_name, mdfd);
 455                 close(mdfd);
 456                 rv = Incremental(chosen_name, verbose, runstop,
 457                                  NULL, homehost, require_homehost, autof);
 458                 if (rv == 1)
 459                         /* Don't fail the whole -I if a subarray didn't
 460                          * have enough devices to start yet
 461                          */
 462                         rv = 0;
 463                 return rv;
 464         }
 465         avail = NULL;
 466         active_disks = count_active(st, mdfd, &avail, &info);
 467         if (enough(info.array.level, info.array.raid_disks,
 468                    info.array.layout, info.array.state & 1,
 469                    avail, active_disks) == 0) {
 470                 free(avail);
 471                 if (verbose >= 0)
 472                         fprintf(stderr, Name
 473                              ": %s attached to %s, not enough to start (%d).\n",
 474                                 devname, chosen_name, active_disks);
 475                 map_unlock(&map);
 476                 close(mdfd);
 477                 return 0;
 478         }
 479         free(avail);
 480
 481         /* 7b/ if yes, */
 482         /* - if number of OK devices match expected, or -R and there */
 483         /*             are enough, */
 484         /*   + add any bitmap file  */
 485         /*   + start the array (auto-readonly). */
 486
 487         if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
 488                 if (verbose >= 0)
 489                         fprintf(stderr, Name
 490                            ": %s attached to %s which is already active.\n",
 491                                 devname, chosen_name);
 492                 close(mdfd);
 493                 map_unlock(&map);
 494                 return 0;
 495         }
 496
 497         map_unlock(&map);
 498         if (runstop > 0 || active_disks >= info.array.working_disks) {
 499                 struct mdinfo *sra;
 500                 /* Let's try to start it */
 501                 if (match && match->bitmap_file) {
 502                         int bmfd = open(match->bitmap_file, O_RDWR);
 503                         if (bmfd < 0) {
 504                                 fprintf(stderr, Name
 505                                         ": Could not open bitmap file %s.\n",
 506                                         match->bitmap_file);
 507                                 close(mdfd);
 508                                 return 1;
 509                         }
 510                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
 511                                 close(bmfd);
 512                                 fprintf(stderr, Name
 513                                         ": Failed to set bitmapfile for %s.\n",
 514                                         chosen_name);
 515                                 close(mdfd);
 516                                 return 1;
 517                         }
 518                         close(bmfd);
 519                 }
 520                 sra = sysfs_read(mdfd, fd2devnum(mdfd), 0);
 521                 if ((sra == NULL || active_disks >= info.array.working_disks)
 522                     && trustworthy != FOREIGN)
 523                         rv = ioctl(mdfd, RUN_ARRAY, NULL);
 524                 else
 525                         rv = sysfs_set_str(sra, NULL,
 526                                            "array_state", "read-auto");
 527                 if (rv == 0) {
 528                         if (verbose >= 0)
 529                                 fprintf(stderr, Name
 530                            ": %s attached to %s, which has been started.\n",
 531                                         devname, chosen_name);
 532                         rv = 0;
 533                         wait_for(chosen_name, mdfd);
 534                 } else {
 535                         fprintf(stderr, Name
 536                              ": %s attached to %s, but failed to start: %s.\n",
 537                                 devname, chosen_name, strerror(errno));
 538                         rv = 1;
 539                 }
 540         } else {
 541                 if (verbose >= 0)
 542                         fprintf(stderr, Name
 543                           ": %s attached to %s, not enough to start safely.\n",
 544                                 devname, chosen_name);
 545                 rv = 0;
 546         }
 547         close(mdfd);
 548         return rv;
 549 }
 550
 551 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
 552                         int number, __u64 events, int verbose,
 553                         char *array_name)
 554 {
 555         /* Find a device attached to this array with a disk.number of number
 556          * and events less than the passed events, and remove the device.
 557          */
 558         struct mdinfo *d;
 559         mdu_array_info_t ra;
 560
 561         if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
 562                 return; /* not safe to remove from active arrays
 563                          * without thinking more */
 564
 565         for (d = sra->devs; d ; d = d->next) {
 566                 char dn[10];
 567                 int dfd;
 568                 struct mdinfo info;
 569                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 570                 dfd = dev_open(dn, O_RDONLY);
 571                 if (dfd < 0)
 572                         continue;
 573                 if (st->ss->load_super(st, dfd, NULL)) {
 574                         close(dfd);
 575                         continue;
 576                 }
 577                 st->ss->getinfo_super(st, &info);
 578                 st->ss->free_super(st);
 579                 close(dfd);
 580
 581                 if (info.disk.number != number ||
 582                     info.events >= events)
 583                         continue;
 584
 585                 if (d->disk.raid_disk > -1)
 586                         sysfs_set_str(sra, d, "slot", "none");
 587                 if (sysfs_set_str(sra, d, "state", "remove") == 0)
 588                         if (verbose >= 0)
 589                                 fprintf(stderr, Name
 590                                         ": removing old device %s from %s\n",
 591                                         d->sys_name+4, array_name);
 592         }
 593 }
 594
 595 static int count_active(struct supertype *st, int mdfd, char **availp,
 596                         struct mdinfo *bestinfo)
 597 {
 598         /* count how many devices in sra think they are active */
 599         struct mdinfo *d;
 600         int cnt = 0, cnt1 = 0;
 601         __u64 max_events = 0;
 602         struct mdinfo *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
 603         char *avail = NULL;
 604
 605         for (d = sra->devs ; d ; d = d->next) {
 606                 char dn[30];
 607                 int dfd;
 608                 int ok;
 609                 struct mdinfo info;
 610
 611                 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
 612                 dfd = dev_open(dn, O_RDONLY);
 613                 if (dfd < 0)
 614                         continue;
 615                 ok =  st->ss->load_super(st, dfd, NULL);
 616                 close(dfd);
 617                 if (ok != 0)
 618                         continue;
 619                 st->ss->getinfo_super(st, &info);
 620                 if (!avail) {
 621                         avail = malloc(info.array.raid_disks);
 622                         if (!avail) {
 623                                 fprintf(stderr, Name ": out of memory.\n");
 624                                 exit(1);
 625                         }
 626                         memset(avail, 0, info.array.raid_disks);
 627                         *availp = avail;
 628                 }
 629
 630                 if (info.disk.state & (1<<MD_DISK_SYNC))
 631                 {
 632                         if (cnt == 0) {
 633                                 cnt++;
 634                                 max_events = info.events;
 635                                 avail[info.disk.raid_disk] = 2;
 636                                 st->ss->getinfo_super(st, bestinfo);
 637                         } else if (info.events == max_events) {
 638                                 cnt++;
 639                                 avail[info.disk.raid_disk] = 2;
 640                         } else if (info.events == max_events-1) {
 641                                 cnt1++;
 642                                 avail[info.disk.raid_disk] = 1;
 643                         } else if (info.events < max_events - 1)
 644                                 ;
 645                         else if (info.events == max_events+1) {
 646                                 int i;
 647                                 cnt1 = cnt;
 648                                 cnt = 1;
 649                                 max_events = info.events;
 650                                 for (i=0; i<info.array.raid_disks; i++)
 651                                         if (avail[i])
 652                                                 avail[i]--;
 653                                 avail[info.disk.raid_disk] = 2;
 654                                 st->ss->getinfo_super(st, bestinfo);
 655                         } else { /* info.events much bigger */
 656                                 cnt = 1; cnt1 = 0;
 657                                 memset(avail, 0, info.disk.raid_disk);
 658                                 max_events = info.events;
 659                                 st->ss->getinfo_super(st, bestinfo);
 660                         }
 661                 }
 662                 st->ss->free_super(st);
 663         }
 664         return cnt + cnt1;
 665 }
 666
 667 int IncrementalScan(int verbose)
 668 {
 669         /* look at every device listed in the 'map' file.
 670          * If one is found that is not running then:
 671          *  look in mdadm.conf for bitmap file.
 672          *   if one exists, but array has none, add it.
 673          *  try to start array in auto-readonly mode
 674          */
 675         struct map_ent *mapl = NULL;
 676         struct map_ent *me;
 677         mddev_ident_t devs, mddev;
 678         int rv = 0;
 679
 680         map_read(&mapl);
 681         devs = conf_get_ident(NULL);
 682
 683         for (me = mapl ; me ; me = me->next) {
 684                 mdu_array_info_t array;
 685                 mdu_bitmap_file_t bmf;
 686                 struct mdinfo *sra;
 687                 int mdfd = open_dev(me->devnum);
 688
 689                 if (mdfd < 0)
 690                         continue;
 691                 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
 692                     errno != ENODEV) {
 693                         close(mdfd);
 694                         continue;
 695                 }
 696                 /* Ok, we can try this one.   Maybe it needs a bitmap */
 697                 for (mddev = devs ; mddev ; mddev = mddev->next)
 698                         if (mddev->devname && me->path
 699                             && devname_matches(mddev->devname, me->path))
 700                                 break;
 701                 if (mddev && mddev->bitmap_file) {
 702                         /*
 703                          * Note: early kernels will wrongly fail this, so it
 704                          * is a hint only
 705                          */
 706                         int added = -1;
 707                         if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
 708                                 int bmfd = open(mddev->bitmap_file, O_RDWR);
 709                                 if (bmfd >= 0) {
 710                                         added = ioctl(mdfd, SET_BITMAP_FILE,
 711                                                       bmfd);
 712                                         close(bmfd);
 713                                 }
 714                         }
 715                         if (verbose >= 0) {
 716                                 if (added == 0)
 717                                         fprintf(stderr, Name
 718                                                 ": Added bitmap %s to %s\n",
 719                                                 mddev->bitmap_file, me->path);
 720                                 else if (errno != EEXIST)
 721                                         fprintf(stderr, Name
 722                                            ": Failed to add bitmap to %s: %s\n",
 723                                                 me->path, strerror(errno));
 724                         }
 725                 }
 726                 sra = sysfs_read(mdfd, 0, 0);
 727                 if (sra) {
 728                         if (sysfs_set_str(sra, NULL,
 729                                           "array_state", "read-auto") == 0) {
 730                                 if (verbose >= 0)
 731                                         fprintf(stderr, Name
 732                                                 ": started array %s\n",
 733                                                 me->path ?: devnum2devname(me->devnum));
 734                         } else {
 735                                 fprintf(stderr, Name
 736                                         ": failed to start array %s: %s\n",
 737                                         me->path ?: devnum2devname(me->devnum),
 738                                         strerror(errno));
 739                                 rv = 1;
 740                         }
 741                 }
 742         }
 743         return rv;
 744 }
 745
 746 static char *container2devname(char *devname)
 747 {
 748         char *mdname = NULL;
 749
 750         if (devname[0] == '/') {
 751                 int fd = open(devname, O_RDONLY);
 752                 if (fd >= 0) {
 753                         mdname = devnum2devname(fd2devnum(fd));
 754                         close(fd);
 755                 }
 756         } else {
 757                 int uuid[4];
 758                 struct map_ent *mp, *map = NULL;
 759
 760                 if (!parse_uuid(devname, uuid))
 761                         return mdname;
 762                 mp = map_by_uuid(&map, uuid);
 763                 if (mp)
 764                         mdname = devnum2devname(mp->devnum);
 765                 map_free(map);
 766         }
 767
 768         return mdname;
 769 }
 770
 771 int Incremental_container(struct supertype *st, char *devname, int verbose,
 772                           int runstop, int autof, int trustworthy)
 773 {
 774         /* Collect the contents of this container and for each
 775          * array, choose a device name and assemble the array.
 776          */
 777
 778         struct mdinfo *list = st->ss->container_content(st);
 779         struct mdinfo *ra;
 780         struct map_ent *map = NULL;
 781
 782         map_lock(&map);
 783
 784         for (ra = list ; ra ; ra = ra->next) {
 785                 int mdfd;
 786                 char chosen_name[1024];
 787                 struct map_ent *mp;
 788                 struct mddev_ident_s *match = NULL;
 789
 790                 mp = map_by_uuid(&map, ra->uuid);
 791
 792                 if (mp) {
 793                         mdfd = open_dev(mp->devnum);
 794                         if (mp->path)
 795                                 strcpy(chosen_name, mp->path);
 796                         else
 797                                 strcpy(chosen_name, devnum2devname(mp->devnum));
 798                 } else {
 799
 800                         /* Check in mdadm.conf for container == devname and
 801                          * member == ra->text_version after second slash.
 802                          */
 803                         char *sub = strchr(ra->text_version+1, '/');
 804                         struct mddev_ident_s *array_list;
 805                         if (sub) {
 806                                 sub++;
 807                                 array_list = conf_get_ident(NULL);
 808                         } else
 809                                 array_list = NULL;
 810                         for(; array_list ; array_list = array_list->next) {
 811                                 char *dn;
 812                                 if (array_list->member == NULL ||
 813                                     array_list->container == NULL)
 814                                         continue;
 815                                 if (strcmp(array_list->member, sub) != 0)
 816                                         continue;
 817                                 if (array_list->uuid_set &&
 818                                     !same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
 819                                         continue;
 820                                 dn = container2devname(array_list->container);
 821                                 if (dn == NULL)
 822                                         continue;
 823                                 if (strncmp(dn, ra->text_version+1,
 824                                             strlen(dn)) != 0 ||
 825                                     ra->text_version[strlen(dn)+1] != '/') {
 826                                         free(dn);
 827                                         continue;
 828                                 }
 829                                 free(dn);
 830                                 /* we have a match */
 831                                 match = array_list;
 832                                 if (verbose>0)
 833                                         fprintf(stderr, Name ": match found for member %s\n",
 834                                                 array_list->member);
 835                                 break;
 836                         }
 837
 838                         if (match && match->devname &&
 839                             strcasecmp(match->devname, "<ignore>") == 0) {
 840                                 if (verbose > 0)
 841                                         fprintf(stderr, Name ": array %s/%s is "
 842                                                 "explicitly ignored by mdadm.conf\n",
 843                                                 match->container, match->member);
 844                                 return 2;
 845                         }
 846                         if (match)
 847                                 trustworthy = LOCAL;
 848
 849                         mdfd = create_mddev(match ? match->devname : NULL,
 850                                             ra->name,
 851                                             autof,
 852                                             trustworthy,
 853                                             chosen_name);
 854                 }
 855
 856                 if (mdfd < 0) {
 857                         fprintf(stderr, Name ": failed to open %s: %s.\n",
 858                                 chosen_name, strerror(errno));
 859                         return 2;
 860                 }
 861
 862                 assemble_container_content(st, mdfd, ra, runstop,
 863                                            chosen_name, verbose);
 864         }
 865         map_unlock(&map);
 866         return 0;
 867 }
 868
 869 /*
 870  * IncrementalRemove - Attempt to see if the passed in device belongs to any
 871  * raid arrays, and if so first fail (if needed) and then remove the device.
 872  *
 873  * @devname - The device we want to remove
 874  *
 875  * Note: the device name must be a kernel name like "sda", so
 876  * that we can find it in /proc/mdstat
 877  */
 878 int IncrementalRemove(char *devname, int verbose)
 879 {
 880         int mdfd;
 881         struct mdstat_ent *ent;
 882         struct mddev_dev_s devlist;
 883
 884         if (strchr(devname, '/')) {
 885                 fprintf(stderr, Name ": incremental removal requires a "
 886                         "kernel device name, not a file: %s\n", devname);
 887                 return 1;
 888         }
 889         ent = mdstat_by_component(devname);
 890         if (!ent) {
 891                 fprintf(stderr, Name ": %s does not appear to be a component "
 892                         "of any array\n", devname);
 893                 return 1;
 894         }
 895         mdfd = open_dev(ent->devnum);
 896         if (mdfd < 0) {
 897                 fprintf(stderr, Name ": Cannot open array %s!!\n", ent->dev);
 898                 return 1;
 899         }
 900         memset(&devlist, 0, sizeof(devlist));
 901         devlist.devname = devname;
 902         devlist.disposition = 'f';
 903         Manage_subdevs(ent->dev, mdfd, &devlist, verbose);
 904         devlist.disposition = 'r';
 905         return Manage_subdevs(ent->dev, mdfd, &devlist, verbose);
 906 }