mdadm.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2012 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@suse.de>
  23  *
  24  *    Additions for bitmap and write-behind RAID options, Copyright (C) 2003-2004,
  25  *    Paul Clements, SteelEye Technology, Inc.
  26  */
  27
  28 #include "mdadm.h"
  29 #include "md_p.h"
  30 #include <ctype.h>
  31
  32
  33 static int scan_assemble(struct supertype *ss,
  34                          struct context *c,
  35                          struct mddev_ident *ident);
  36 static int misc_scan(char devmode, struct context *c);
  37 static int stop_scan(int verbose);
  38 static int misc_list(struct mddev_dev *devlist,
  39                      struct mddev_ident *ident,
  40                      char *dump_directory,
  41                      struct supertype *ss, struct context *c);
  42
  43
  44 int main(int argc, char *argv[])
  45 {
  46         int mode = 0;
  47         int opt;
  48         int option_index;
  49         int rv;
  50         int i;
  51
  52         unsigned long long array_size = 0;
  53         unsigned long long data_offset = INVALID_SECTORS;
  54         struct mddev_ident ident;
  55         char *configfile = NULL;
  56         int devmode = 0;
  57         int bitmap_fd = -1;
  58         struct mddev_dev *devlist = NULL;
  59         struct mddev_dev **devlistend = & devlist;
  60         struct mddev_dev *dv;
  61         int devs_found = 0;
  62         char *symlinks = NULL;
  63         int grow_continue = 0;
  64         /* autof indicates whether and how to create device node.
  65          * bottom 3 bits are style.  Rest (when shifted) are number of parts
  66          * 0  - unset
  67          * 1  - don't create (no)
  68          * 2  - if is_standard, then create (yes)
  69          * 3  - create as 'md' - reject is_standard mdp (md)
  70          * 4  - create as 'mdp' - reject is_standard md (mdp)
  71          * 5  - default to md if not is_standard (md in config file)
  72          * 6  - default to mdp if not is_standard (part, or mdp in config file)
  73          */
  74         struct context c = {
  75                 .require_homehost = 1,
  76         };
  77         struct shape s = {
  78                 .level          = UnSet,
  79                 .layout         = UnSet,
  80                 .bitmap_chunk   = UnSet,
  81         };
  82
  83         char sys_hostname[256];
  84         char *mailaddr = NULL;
  85         char *program = NULL;
  86         int increments = 20;
  87         int daemonise = 0;
  88         char *pidfile = NULL;
  89         int oneshot = 0;
  90         int spare_sharing = 1;
  91         struct supertype *ss = NULL;
  92         int writemostly = 0;
  93         char *shortopt = short_options;
  94         int dosyslog = 0;
  95         int rebuild_map = 0;
  96         char *remove_path = NULL;
  97         char *udev_filename = NULL;
  98         char *dump_directory = NULL;
  99
 100         int print_help = 0;
 101         FILE *outf;
 102
 103         int mdfd = -1;
 104
 105         srandom(time(0) ^ getpid());
 106
 107         ident.uuid_set=0;
 108         ident.level = UnSet;
 109         ident.raid_disks = UnSet;
 110         ident.super_minor= UnSet;
 111         ident.devices=0;
 112         ident.spare_group = NULL;
 113         ident.autof = 0;
 114         ident.st = NULL;
 115         ident.bitmap_fd = -1;
 116         ident.bitmap_file = NULL;
 117         ident.name[0] = 0;
 118         ident.container = NULL;
 119         ident.member = NULL;
 120
 121         /*
 122          * set first char of argv[0] to @. This is used by
 123          * systemd to signal that the task was launched from
 124          * initrd/initramfs and should be preserved during shutdown
 125          */
 126         argv[0][0] = '@';
 127
 128         while ((option_index = -1) ,
 129                (opt=getopt_long(argc, argv,
 130                                 shortopt, long_options,
 131                                 &option_index)) != -1) {
 132                 int newmode = mode;
 133                 /* firstly, some mode-independent options */
 134                 switch(opt) {
 135                 case HelpOptions:
 136                         print_help = 2;
 137                         continue;
 138                 case 'h':
 139                         print_help = 1;
 140                         continue;
 141
 142                 case 'V':
 143                         fputs(Version, stderr);
 144                         exit(0);
 145
 146                 case 'v': c.verbose++;
 147                         continue;
 148
 149                 case 'q': c.verbose--;
 150                         continue;
 151
 152                 case 'b':
 153                         if (mode == ASSEMBLE || mode == BUILD || mode == CREATE
 154                             || mode == GROW || mode == INCREMENTAL
 155                             || mode == MANAGE)
 156                                 break; /* b means bitmap */
 157                 case Brief:
 158                         c.brief = 1;
 159                         continue;
 160
 161                 case 'Y': c.export++;
 162                         continue;
 163
 164                 case HomeHost:
 165                         if (strcasecmp(optarg, "<ignore>") == 0)
 166                                 c.require_homehost = 0;
 167                         else
 168                                 c.homehost = optarg;
 169                         continue;
 170
 171                 case OffRootOpt:
 172                         /* Silently ignore old option */
 173                         continue;
 174
 175                 case Prefer:
 176                         if (c.prefer)
 177                                 free(c.prefer);
 178                         if (asprintf(&c.prefer, "/%s/", optarg) <= 0)
 179                                 c.prefer = NULL;
 180                         continue;
 181
 182                 case ':':
 183                 case '?':
 184                         fputs(Usage, stderr);
 185                         exit(2);
 186                 }
 187                 /* second, figure out the mode.
 188                  * Some options force the mode.  Others
 189                  * set the mode if it isn't already
 190                  */
 191
 192                 switch(opt) {
 193                 case ManageOpt:
 194                         newmode = MANAGE;
 195                         shortopt = short_bitmap_options;
 196                         break;
 197                 case 'a':
 198                 case Add:
 199                 case 'r':
 200                 case Remove:
 201                 case Replace:
 202                 case With:
 203                 case 'f':
 204                 case Fail:
 205                 case ReAdd: /* re-add */
 206                         if (!mode) {
 207                                 newmode = MANAGE;
 208                                 shortopt = short_bitmap_options;
 209                         }
 210                         break;
 211
 212                 case 'A': newmode = ASSEMBLE;
 213                         shortopt = short_bitmap_auto_options;
 214                         break;
 215                 case 'B': newmode = BUILD;
 216                         shortopt = short_bitmap_auto_options;
 217                         break;
 218                 case 'C': newmode = CREATE;
 219                         shortopt = short_bitmap_auto_options;
 220                         break;
 221                 case 'F': newmode = MONITOR;
 222                         break;
 223                 case 'G': newmode = GROW;
 224                         shortopt = short_bitmap_options;
 225                         break;
 226                 case 'I': newmode = INCREMENTAL;
 227                         shortopt = short_bitmap_auto_options;
 228                         break;
 229                 case AutoDetect:
 230                         newmode = AUTODETECT;
 231                         break;
 232
 233                 case MiscOpt:
 234                 case 'D':
 235                 case 'E':
 236                 case 'X':
 237                 case 'Q':
 238                 case ExamineBB:
 239                 case Dump:
 240                 case Restore:
 241                         newmode = MISC;
 242                         break;
 243
 244                 case 'R':
 245                 case 'S':
 246                 case 'o':
 247                 case 'w':
 248                 case 'W':
 249                 case WaitOpt:
 250                 case Waitclean:
 251                 case DetailPlatform:
 252                 case KillSubarray:
 253                 case UpdateSubarray:
 254                 case UdevRules:
 255                 case KillOpt:
 256                         if (!mode)
 257                                 newmode = MISC;
 258                         break;
 259
 260                 case NoSharing:
 261                         newmode = MONITOR;
 262                         break;
 263                 }
 264                 if (mode && newmode == mode) {
 265                         /* everybody happy ! */
 266                 } else if (mode && newmode != mode) {
 267                         /* not allowed.. */
 268                         pr_err("");
 269                         if (option_index >= 0)
 270                                 fprintf(stderr, "--%s", long_options[option_index].name);
 271                         else
 272                                 fprintf(stderr, "-%c", opt);
 273                         fprintf(stderr, " would set mdadm mode to \"%s\", but it is already set to \"%s\".\n",
 274                                 map_num(modes, newmode),
 275                                 map_num(modes, mode));
 276                         exit(2);
 277                 } else if (!mode && newmode) {
 278                         mode = newmode;
 279                         if (mode == MISC && devs_found) {
 280                                 pr_err("No action given for %s in --misc mode\n",
 281                                         devlist->devname);
 282                                 fprintf(stderr,"       Action options must come before device names\n");
 283                                 exit(2);
 284                         }
 285                 } else {
 286                         /* special case of -c --help */
 287                         if ((opt == 'c' || opt == ConfigFile) &&
 288                             ( strncmp(optarg, "--h", 3)==0 ||
 289                               strncmp(optarg, "-h", 2)==0)) {
 290                                 fputs(Help_config, stdout);
 291                                 exit(0);
 292                         }
 293
 294                         /* If first option is a device, don't force the mode yet */
 295                         if (opt == 1) {
 296                                 if (devs_found == 0) {
 297                                         dv = xmalloc(sizeof(*dv));
 298                                         dv->devname = optarg;
 299                                         dv->disposition = devmode;
 300                                         dv->writemostly = writemostly;
 301                                         dv->used = 0;
 302                                         dv->next = NULL;
 303                                         *devlistend = dv;
 304                                         devlistend = &dv->next;
 305
 306                                         devs_found++;
 307                                         continue;
 308                                 }
 309                                 /* No mode yet, and this is the second device ... */
 310                                 pr_err("An option must be given to set the mode before a second device\n"
 311                                         "       (%s) is listed\n", optarg);
 312                                 exit(2);
 313                         }
 314                         if (option_index >= 0)
 315                                 pr_err("--%s", long_options[option_index].name);
 316                         else
 317                                 pr_err("-%c", opt);
 318                         fprintf(stderr, " does not set the mode, and so cannot be the first option.\n");
 319                         exit(2);
 320                 }
 321
 322                 /* if we just set the mode, then done */
 323                 switch(opt) {
 324                 case ManageOpt:
 325                 case MiscOpt:
 326                 case 'A':
 327                 case 'B':
 328                 case 'C':
 329                 case 'F':
 330                 case 'G':
 331                 case 'I':
 332                 case AutoDetect:
 333                         continue;
 334                 }
 335                 if (opt == 1) {
 336                         /* an undecorated option - must be a device name.
 337                          */
 338
 339                         if (devs_found > 0 && devmode == DetailPlatform) {
 340                                 pr_err("controller may only be specified once. %s ignored\n",
 341                                                 optarg);
 342                                 continue;
 343                         }
 344
 345                         if (devs_found > 0 && mode == MANAGE && !devmode) {
 346                                 pr_err("Must give one of -a/-r/-f"
 347                                         " for subsequent devices at %s\n", optarg);
 348                                 exit(2);
 349                         }
 350                         if (devs_found > 0 && mode == GROW && !devmode) {
 351                                 pr_err("Must give -a/--add for"
 352                                        " devices to add: %s\n", optarg);
 353                                 exit(2);
 354                         }
 355                         dv = xmalloc(sizeof(*dv));
 356                         dv->devname = optarg;
 357                         dv->disposition = devmode;
 358                         dv->writemostly = writemostly;
 359                         dv->used = 0;
 360                         dv->next = NULL;
 361                         *devlistend = dv;
 362                         devlistend = &dv->next;
 363
 364                         devs_found++;
 365                         continue;
 366                 }
 367
 368                 /* We've got a mode, and opt is now something else which
 369                  * could depend on the mode */
 370 #define O(a,b) ((a<<16)|b)
 371                 switch (O(mode,opt)) {
 372                 case O(GROW,'c'):
 373                 case O(GROW,ChunkSize):
 374                 case O(CREATE,'c'):
 375                 case O(CREATE,ChunkSize):
 376                 case O(BUILD,'c'): /* chunk or rounding */
 377                 case O(BUILD,ChunkSize): /* chunk or rounding */
 378                         if (s.chunk) {
 379                                 pr_err("chunk/rounding may only be specified once. "
 380                                         "Second value is %s.\n", optarg);
 381                                 exit(2);
 382                         }
 383                         s.chunk = parse_size(optarg);
 384                         if (s.chunk == INVALID_SECTORS ||
 385                             s.chunk < 8 || (s.chunk&1)) {
 386                                 pr_err("invalid chunk/rounding value: %s\n",
 387                                         optarg);
 388                                 exit(2);
 389                         }
 390                         /* Convert sectors to K */
 391                         s.chunk /= 2;
 392                         continue;
 393
 394                 case O(INCREMENTAL, 'e'):
 395                 case O(CREATE,'e'):
 396                 case O(ASSEMBLE,'e'):
 397                 case O(MISC,'e'): /* set metadata (superblock) information */
 398                         if (ss) {
 399                                 pr_err("metadata information already given\n");
 400                                 exit(2);
 401                         }
 402                         for(i=0; !ss && superlist[i]; i++)
 403                                 ss = superlist[i]->match_metadata_desc(optarg);
 404
 405                         if (!ss) {
 406                                 pr_err("unrecognised metadata identifier: %s\n", optarg);
 407                                 exit(2);
 408                         }
 409                         continue;
 410
 411                 case O(MANAGE,'W'):
 412                 case O(MANAGE,WriteMostly):
 413                 case O(BUILD,'W'):
 414                 case O(BUILD,WriteMostly):
 415                 case O(CREATE,'W'):
 416                 case O(CREATE,WriteMostly):
 417                         /* set write-mostly for following devices */
 418                         writemostly = 1;
 419                         continue;
 420
 421                 case O(MANAGE,'w'):
 422                         /* clear write-mostly for following devices */
 423                         writemostly = 2;
 424                         continue;
 425
 426
 427                 case O(GROW,'z'):
 428                 case O(CREATE,'z'):
 429                 case O(BUILD,'z'): /* size */
 430                         if (s.size > 0) {
 431                                 pr_err("size may only be specified once. "
 432                                         "Second value is %s.\n", optarg);
 433                                 exit(2);
 434                         }
 435                         if (strcmp(optarg, "max")==0)
 436                                 s.size = MAX_SIZE;
 437                         else {
 438                                 s.size = parse_size(optarg);
 439                                 if (s.size == INVALID_SECTORS ||
 440                                     s.size < 8) {
 441                                         pr_err("invalid size: %s\n",
 442                                                 optarg);
 443                                         exit(2);
 444                                 }
 445                                 /* convert sectors to K */
 446                                 s.size /= 2;
 447                         }
 448                         continue;
 449
 450                 case O(GROW,'Z'): /* array size */
 451                         if (array_size > 0) {
 452                                 pr_err("array-size may only be specified once. "
 453                                         "Second value is %s.\n", optarg);
 454                                 exit(2);
 455                         }
 456                         if (strcmp(optarg, "max") == 0)
 457                                 array_size = MAX_SIZE;
 458                         else {
 459                                 array_size = parse_size(optarg);
 460                                 if (array_size == 0 ||
 461                                     array_size == INVALID_SECTORS) {
 462                                         pr_err("invalid array size: %s\n",
 463                                                 optarg);
 464                                         exit(2);
 465                                 }
 466                         }
 467                         continue;
 468
 469                 case O(CREATE,DataOffset):
 470                 case O(GROW,DataOffset):
 471                         if (data_offset != INVALID_SECTORS) {
 472                                 fprintf(stderr, Name ": data-offset may only be specified one. "
 473                                         "Second value is %s.\n", optarg);
 474                                 exit(2);
 475                         }
 476                         if (mode == CREATE &&
 477                             strcmp(optarg, "variable") == 0)
 478                                 data_offset = VARIABLE_OFFSET;
 479                         else
 480                                 data_offset = parse_size(optarg);
 481                         if (data_offset == INVALID_SECTORS) {
 482                                 fprintf(stderr, Name ": invalid data-offset: %s\n",
 483                                         optarg);
 484                                 exit(2);
 485                         }
 486                         continue;
 487
 488                 case O(GROW,'l'):
 489                 case O(CREATE,'l'):
 490                 case O(BUILD,'l'): /* set raid level*/
 491                         if (s.level != UnSet) {
 492                                 pr_err("raid level may only be set once.  "
 493                                         "Second value is %s.\n", optarg);
 494                                 exit(2);
 495                         }
 496                         s.level = map_name(pers, optarg);
 497                         if (s.level == UnSet) {
 498                                 pr_err("invalid raid level: %s\n",
 499                                         optarg);
 500                                 exit(2);
 501                         }
 502                         if (s.level != 0 && s.level != LEVEL_LINEAR && s.level != 1 &&
 503                             s.level != LEVEL_MULTIPATH && s.level != LEVEL_FAULTY &&
 504                             s.level != 10 &&
 505                             mode == BUILD) {
 506                                 pr_err("Raid level %s not permitted with --build.\n",
 507                                         optarg);
 508                                 exit(2);
 509                         }
 510                         if (s.sparedisks > 0 && s.level < 1 && s.level >= -1) {
 511                                 pr_err("raid level %s is incompatible with spare-devices setting.\n",
 512                                         optarg);
 513                                 exit(2);
 514                         }
 515                         ident.level = s.level;
 516                         continue;
 517
 518                 case O(GROW, 'p'): /* new layout */
 519                 case O(GROW, Layout):
 520                         if (s.layout_str) {
 521                                 pr_err("layout may only be sent once.  "
 522                                        "Second value was %s\n", optarg);
 523                                 exit(2);
 524                         }
 525                         s.layout_str = optarg;
 526                         /* 'Grow' will parse the value */
 527                         continue;
 528
 529                 case O(CREATE,'p'): /* raid5 layout */
 530                 case O(CREATE,Layout):
 531                 case O(BUILD,'p'): /* faulty layout */
 532                 case O(BUILD,Layout):
 533                         if (s.layout != UnSet) {
 534                                 pr_err("layout may only be sent once.  "
 535                                        "Second value was %s\n", optarg);
 536                                 exit(2);
 537                         }
 538                         switch(s.level) {
 539                         default:
 540                                 pr_err("layout not meaningful for %s arrays.\n",
 541                                         map_num(pers, s.level));
 542                                 exit(2);
 543                         case UnSet:
 544                                 pr_err("raid level must be given before layout.\n");
 545                                 exit(2);
 546
 547                         case 5:
 548                                 s.layout = map_name(r5layout, optarg);
 549                                 if (s.layout==UnSet) {
 550                                         pr_err("layout %s not understood for raid5.\n",
 551                                                 optarg);
 552                                         exit(2);
 553                                 }
 554                                 break;
 555                         case 6:
 556                                 s.layout = map_name(r6layout, optarg);
 557                                 if (s.layout==UnSet) {
 558                                         pr_err("layout %s not understood for raid6.\n",
 559                                                 optarg);
 560                                         exit(2);
 561                                 }
 562                                 break;
 563
 564                         case 10:
 565                                 s.layout = parse_layout_10(optarg);
 566                                 if (s.layout < 0) {
 567                                         pr_err("layout for raid10 must be 'nNN', 'oNN' or 'fNN' where NN is a number, not %s\n", optarg);
 568                                         exit(2);
 569                                 }
 570                                 break;
 571                         case LEVEL_FAULTY:
 572                                 /* Faulty
 573                                  * modeNNN
 574                                  */
 575                                 s.layout = parse_layout_faulty(optarg);
 576                                 if (s.layout == -1) {
 577                                         pr_err("layout %s not understood for faulty.\n",
 578                                                 optarg);
 579                                         exit(2);
 580                                 }
 581                                 break;
 582                         }
 583                         continue;
 584
 585                 case O(CREATE,AssumeClean):
 586                 case O(BUILD,AssumeClean): /* assume clean */
 587                 case O(GROW,AssumeClean):
 588                         s.assume_clean = 1;
 589                         continue;
 590
 591                 case O(GROW,'n'):
 592                 case O(CREATE,'n'):
 593                 case O(BUILD,'n'): /* number of raid disks */
 594                         if (s.raiddisks) {
 595                                 pr_err("raid-devices set twice: %d and %s\n",
 596                                         s.raiddisks, optarg);
 597                                 exit(2);
 598                         }
 599                         s.raiddisks = parse_num(optarg);
 600                         if (s.raiddisks <= 0) {
 601                                 pr_err("invalid number of raid devices: %s\n",
 602                                         optarg);
 603                                 exit(2);
 604                         }
 605                         ident.raid_disks = s.raiddisks;
 606                         continue;
 607
 608                 case O(CREATE,'x'): /* number of spare (eXtra) disks */
 609                         if (s.sparedisks) {
 610                                 pr_err("spare-devices set twice: %d and %s\n",
 611                                        s.sparedisks, optarg);
 612                                 exit(2);
 613                         }
 614                         if (s.level != UnSet && s.level <= 0 && s.level >= -1) {
 615                                 pr_err("spare-devices setting is incompatible with raid level %d\n",
 616                                         s.level);
 617                                 exit(2);
 618                         }
 619                         s.sparedisks = parse_num(optarg);
 620                         if (s.sparedisks < 0) {
 621                                 pr_err("invalid number of spare-devices: %s\n",
 622                                         optarg);
 623                                 exit(2);
 624                         }
 625                         continue;
 626
 627                 case O(CREATE,'a'):
 628                 case O(CREATE,Auto):
 629                 case O(BUILD,'a'):
 630                 case O(BUILD,Auto):
 631                 case O(INCREMENTAL,'a'):
 632                 case O(INCREMENTAL,Auto):
 633                 case O(ASSEMBLE,'a'):
 634                 case O(ASSEMBLE,Auto): /* auto-creation of device node */
 635                         c.autof = parse_auto(optarg, "--auto flag", 0);
 636                         continue;
 637
 638                 case O(CREATE,Symlinks):
 639                 case O(BUILD,Symlinks):
 640                 case O(ASSEMBLE,Symlinks): /* auto creation of symlinks in /dev to /dev/md */
 641                         symlinks = optarg;
 642                         continue;
 643
 644                 case O(BUILD,'f'): /* force honouring '-n 1' */
 645                 case O(BUILD,Force): /* force honouring '-n 1' */
 646                 case O(GROW,'f'): /* ditto */
 647                 case O(GROW,Force): /* ditto */
 648                 case O(CREATE,'f'): /* force honouring of device list */
 649                 case O(CREATE,Force): /* force honouring of device list */
 650                 case O(ASSEMBLE,'f'): /* force assembly */
 651                 case O(ASSEMBLE,Force): /* force assembly */
 652                 case O(MISC,'f'): /* force zero */
 653                 case O(MISC,Force): /* force zero */
 654                 case O(MANAGE,Force): /* add device which is too large */
 655                         c.force=1;
 656                         continue;
 657                         /* now for the Assemble options */
 658                 case O(ASSEMBLE, FreezeReshape):   /* Freeze reshape during
 659                                                     * initrd phase */
 660                 case O(INCREMENTAL, FreezeReshape):
 661                         c.freeze_reshape = 1;
 662                         continue;
 663                 case O(CREATE,'u'): /* uuid of array */
 664                 case O(ASSEMBLE,'u'): /* uuid of array */
 665                         if (ident.uuid_set) {
 666                                 pr_err("uuid cannot be set twice.  "
 667                                         "Second value %s.\n", optarg);
 668                                 exit(2);
 669                         }
 670                         if (parse_uuid(optarg, ident.uuid))
 671                                 ident.uuid_set = 1;
 672                         else {
 673                                 pr_err("Bad uuid: %s\n", optarg);
 674                                 exit(2);
 675                         }
 676                         continue;
 677
 678                 case O(CREATE,'N'):
 679                 case O(ASSEMBLE,'N'):
 680                 case O(MISC,'N'):
 681                         if (ident.name[0]) {
 682                                 pr_err("name cannot be set twice.   "
 683                                         "Second value %s.\n", optarg);
 684                                 exit(2);
 685                         }
 686                         if (mode == MISC && !c.subarray) {
 687                                 pr_err("-N/--name only valid with --update-subarray in misc mode\n");
 688                                 exit(2);
 689                         }
 690                         if (strlen(optarg) > 32) {
 691                                 pr_err("name '%s' is too long, 32 chars max.\n",
 692                                         optarg);
 693                                 exit(2);
 694                         }
 695                         strcpy(ident.name, optarg);
 696                         continue;
 697
 698                 case O(ASSEMBLE,'m'): /* super-minor for array */
 699                 case O(ASSEMBLE,SuperMinor):
 700                         if (ident.super_minor != UnSet) {
 701                                 pr_err("super-minor cannot be set twice.  "
 702                                         "Second value: %s.\n", optarg);
 703                                 exit(2);
 704                         }
 705                         if (strcmp(optarg, "dev")==0)
 706                                 ident.super_minor = -2;
 707                         else {
 708                                 ident.super_minor = parse_num(optarg);
 709                                 if (ident.super_minor < 0) {
 710                                         pr_err("Bad super-minor number: %s.\n", optarg);
 711                                         exit(2);
 712                                 }
 713                         }
 714                         continue;
 715
 716                 case O(ASSEMBLE,'o'):
 717                 case O(MANAGE,'o'):
 718                 case O(CREATE,'o'):
 719                         c.readonly = 1;
 720                         continue;
 721
 722                 case O(ASSEMBLE,'U'): /* update the superblock */
 723                 case O(MISC,'U'):
 724                         if (c.update) {
 725                                 pr_err("Can only update one aspect"
 726                                         " of superblock, both %s and %s given.\n",
 727                                         c.update, optarg);
 728                                 exit(2);
 729                         }
 730                         if (mode == MISC && !c.subarray) {
 731                                 pr_err("Only subarrays can be"
 732                                         " updated in misc mode\n");
 733                                 exit(2);
 734                         }
 735                         c.update = optarg;
 736                         if (strcmp(c.update, "sparc2.2")==0)
 737                                 continue;
 738                         if (strcmp(c.update, "super-minor") == 0)
 739                                 continue;
 740                         if (strcmp(c.update, "summaries")==0)
 741                                 continue;
 742                         if (strcmp(c.update, "resync")==0)
 743                                 continue;
 744                         if (strcmp(c.update, "uuid")==0)
 745                                 continue;
 746                         if (strcmp(c.update, "name")==0)
 747                                 continue;
 748                         if (strcmp(c.update, "homehost")==0)
 749                                 continue;
 750                         if (strcmp(c.update, "devicesize")==0)
 751                                 continue;
 752                         if (strcmp(c.update, "no-bitmap")==0)
 753                                 continue;
 754                         if (strcmp(c.update, "bbl") == 0)
 755                                 continue;
 756                         if (strcmp(c.update, "no-bbl") == 0)
 757                                 continue;
 758                         if (strcmp(c.update, "byteorder")==0) {
 759                                 if (ss) {
 760                                         pr_err("must not set metadata"
 761                                                " type with --update=byteorder.\n");
 762                                         exit(2);
 763                                 }
 764                                 for(i=0; !ss && superlist[i]; i++)
 765                                         ss = superlist[i]->match_metadata_desc(
 766                                                 "0.swap");
 767                                 if (!ss) {
 768                                         pr_err("INTERNAL ERROR"
 769                                                 " cannot find 0.swap\n");
 770                                         exit(2);
 771                                 }
 772
 773                                 continue;
 774                         }
 775                         if (strcmp(c.update,"?") == 0 ||
 776                             strcmp(c.update, "help") == 0) {
 777                                 outf = stdout;
 778                                 fprintf(outf, Name ": ");
 779                         } else {
 780                                 outf = stderr;
 781                                 fprintf(outf,
 782                                         Name ": '--update=%s' is invalid.  ",
 783                                         c.update);
 784                         }
 785                         fprintf(outf, "Valid --update options are:\n"
 786                 "     'sparc2.2', 'super-minor', 'uuid', 'name', 'resync',\n"
 787                 "     'summaries', 'homehost', 'byteorder', 'devicesize',\n"
 788                 "     'no-bitmap'\n");
 789                         exit(outf == stdout ? 0 : 2);
 790
 791                 case O(MANAGE,'U'):
 792                         /* update=devicesize is allowed with --re-add */
 793                         if (devmode != 'A') {
 794                                 pr_err("--update in Manage mode only"
 795                                         " allowed with --re-add.\n");
 796                                 exit(1);
 797                         }
 798                         if (c.update) {
 799                                 pr_err("Can only update one aspect"
 800                                         " of superblock, both %s and %s given.\n",
 801                                         c.update, optarg);
 802                                 exit(2);
 803                         }
 804                         c.update = optarg;
 805                         if (strcmp(c.update, "devicesize") != 0 &&
 806                             strcmp(c.update, "bbl") != 0 &&
 807                             strcmp(c.update, "no-bbl") != 0) {
 808                                 pr_err("only 'devicesize', 'bbl' and 'no-bbl' can be"
 809                                         " updated with --re-add\n");
 810                                 exit(2);
 811                         }
 812                         continue;
 813
 814                 case O(INCREMENTAL,NoDegraded):
 815                         pr_err("--no-degraded is deprecated in Incremental mode\n");
 816                 case O(ASSEMBLE,NoDegraded): /* --no-degraded */
 817                         c.runstop = -1; /* --stop isn't allowed for --assemble,
 818                                          * so we overload slightly */
 819                         continue;
 820
 821                 case O(ASSEMBLE,'c'):
 822                 case O(ASSEMBLE,ConfigFile):
 823                 case O(INCREMENTAL, 'c'):
 824                 case O(INCREMENTAL, ConfigFile):
 825                 case O(MISC, 'c'):
 826                 case O(MISC, ConfigFile):
 827                 case O(MONITOR,'c'):
 828                 case O(MONITOR,ConfigFile):
 829                         if (configfile) {
 830                                 pr_err("configfile cannot be set twice.  "
 831                                         "Second value is %s.\n", optarg);
 832                                 exit(2);
 833                         }
 834                         configfile = optarg;
 835                         set_conffile(configfile);
 836                         /* FIXME possibly check that config file exists.  Even parse it */
 837                         continue;
 838                 case O(ASSEMBLE,'s'): /* scan */
 839                 case O(MISC,'s'):
 840                 case O(MONITOR,'s'):
 841                 case O(INCREMENTAL,'s'):
 842                         c.scan = 1;
 843                         continue;
 844
 845                 case O(MONITOR,'m'): /* mail address */
 846                 case O(MONITOR,EMail):
 847                         if (mailaddr)
 848                                 pr_err("only specify one mailaddress. %s ignored.\n",
 849                                         optarg);
 850                         else
 851                                 mailaddr = optarg;
 852                         continue;
 853
 854                 case O(MONITOR,'p'): /* alert program */
 855                 case O(MONITOR,ProgramOpt): /* alert program */
 856                         if (program)
 857                                 pr_err("only specify one alter program. %s ignored.\n",
 858                                         optarg);
 859                         else
 860                                 program = optarg;
 861                         continue;
 862
 863                 case O(MONITOR,'r'): /* rebuild increments */
 864                 case O(MONITOR,Increment):
 865                         increments = atoi(optarg);
 866                         if (increments > 99 || increments < 1) {
 867                                 pr_err("please specify positive integer between 1 and 99 as rebuild increments.\n");
 868                                 exit(2);
 869                         }
 870                         continue;
 871
 872                 case O(MONITOR,'d'): /* delay in seconds */
 873                 case O(GROW, 'd'):
 874                 case O(BUILD,'d'): /* delay for bitmap updates */
 875                 case O(CREATE,'d'):
 876                         if (c.delay)
 877                                 pr_err("only specify delay once. %s ignored.\n",
 878                                         optarg);
 879                         else {
 880                                 c.delay = parse_num(optarg);
 881                                 if (c.delay < 1) {
 882                                         pr_err("invalid delay: %s\n",
 883                                                 optarg);
 884                                         exit(2);
 885                                 }
 886                         }
 887                         continue;
 888                 case O(MONITOR,'f'): /* daemonise */
 889                 case O(MONITOR,Fork):
 890                         daemonise = 1;
 891                         continue;
 892                 case O(MONITOR,'i'): /* pid */
 893                         if (pidfile)
 894                                 pr_err("only specify one pid file. %s ignored.\n",
 895                                         optarg);
 896                         else
 897                                 pidfile = optarg;
 898                         continue;
 899                 case O(MONITOR,'1'): /* oneshot */
 900                         oneshot = 1;
 901                         spare_sharing = 0;
 902                         continue;
 903                 case O(MONITOR,'t'): /* test */
 904                         c.test = 1;
 905                         continue;
 906                 case O(MONITOR,'y'): /* log messages to syslog */
 907                         openlog("mdadm", LOG_PID, SYSLOG_FACILITY);
 908                         dosyslog = 1;
 909                         continue;
 910                 case O(MONITOR, NoSharing):
 911                         spare_sharing = 0;
 912                         continue;
 913
 914                         /* now the general management options.  Some are applicable
 915                          * to other modes. None have arguments.
 916                          */
 917                 case O(GROW,'a'):
 918                 case O(GROW,Add):
 919                 case O(MANAGE,'a'):
 920                 case O(MANAGE,Add): /* add a drive */
 921                         devmode = 'a';
 922                         continue;
 923                 case O(MANAGE,ReAdd):
 924                         devmode = 'A';
 925                         continue;
 926                 case O(MANAGE,'r'): /* remove a drive */
 927                 case O(MANAGE,Remove):
 928                         devmode = 'r';
 929                         continue;
 930                 case O(MANAGE,'f'): /* set faulty */
 931                 case O(MANAGE,Fail):
 932                 case O(INCREMENTAL,'f'):
 933                 case O(INCREMENTAL,Remove):
 934                 case O(INCREMENTAL,Fail): /* r for incremental is taken, use f
 935                                            * even though we will both fail and
 936                                            * remove the device */
 937                         devmode = 'f';
 938                         continue;
 939                 case O(MANAGE,Replace):
 940                         /* Mark these devices for replacement */
 941                         devmode = 'R';
 942                         continue;
 943                 case O(MANAGE,With):
 944                         /* These are the replacements to use */
 945                         if (devmode != 'R') {
 946                                 pr_err("--with must follow --replace\n");
 947                                 exit(2);
 948                         }
 949                         devmode = 'W';
 950                         continue;
 951                 case O(INCREMENTAL,'R'):
 952                 case O(MANAGE,'R'):
 953                 case O(ASSEMBLE,'R'):
 954                 case O(BUILD,'R'):
 955                 case O(CREATE,'R'): /* Run the array */
 956                         if (c.runstop < 0) {
 957                                 pr_err("Cannot both Stop and Run an array\n");
 958                                 exit(2);
 959                         }
 960                         c.runstop = 1;
 961                         continue;
 962                 case O(MANAGE,'S'):
 963                         if (c.runstop > 0) {
 964                                 pr_err("Cannot both Run and Stop an array\n");
 965                                 exit(2);
 966                         }
 967                         c.runstop = -1;
 968                         continue;
 969                 case O(MANAGE,'t'):
 970                         c.test = 1;
 971                         continue;
 972
 973                 case O(MISC,'Q'):
 974                 case O(MISC,'D'):
 975                 case O(MISC,'E'):
 976                 case O(MISC,KillOpt):
 977                 case O(MISC,'R'):
 978                 case O(MISC,'S'):
 979                 case O(MISC,'X'):
 980                 case O(MISC, ExamineBB):
 981                 case O(MISC,'o'):
 982                 case O(MISC,'w'):
 983                 case O(MISC,'W'):
 984                 case O(MISC, WaitOpt):
 985                 case O(MISC, Waitclean):
 986                 case O(MISC, DetailPlatform):
 987                 case O(MISC, KillSubarray):
 988                 case O(MISC, UpdateSubarray):
 989                 case O(MISC, Dump):
 990                 case O(MISC, Restore):
 991                         if (opt == KillSubarray || opt == UpdateSubarray) {
 992                                 if (c.subarray) {
 993                                         pr_err("subarray can only"
 994                                                 " be specified once\n");
 995                                         exit(2);
 996                                 }
 997                                 c.subarray = optarg;
 998                         }
 999                         if (devmode && devmode != opt &&
1000                             (devmode == 'E' || (opt == 'E' && devmode != 'Q'))) {
1001                                 pr_err("--examine/-E cannot be given with ");
1002                                 if (devmode == 'E') {
1003                                         if (option_index >= 0)
1004                                                 fprintf(stderr, "--%s\n",
1005                                                         long_options[option_index].name);
1006                                         else
1007                                                 fprintf(stderr, "-%c\n", opt);
1008                                 } else if (isalpha(devmode))
1009                                         fprintf(stderr, "-%c\n", devmode);
1010                                 else
1011                                         fprintf(stderr, "previous option\n");
1012                                 exit(2);
1013                         }
1014                         devmode = opt;
1015                         if (opt == Dump || opt == Restore) {
1016                                 if (dump_directory != NULL) {
1017                                         pr_err("dump/restore directory specified twice: %s and %s\n",
1018                                                dump_directory, optarg);
1019                                         exit(2);
1020                                 }
1021                                 dump_directory = optarg;
1022                         }
1023                         continue;
1024                 case O(MISC, UdevRules):
1025                         if (devmode && devmode != opt) {
1026                                 pr_err("--udev-rules must"
1027                                        " be the only option.\n");
1028                         } else {
1029                                 if (udev_filename)
1030                                         pr_err("only specify one udev "
1031                                                 "rule filename. %s ignored.\n",
1032                                                 optarg);
1033                                 else
1034                                         udev_filename = optarg;
1035                         }
1036                         devmode = opt;
1037                         continue;
1038                 case O(MISC,'t'):
1039                         c.test = 1;
1040                         continue;
1041
1042                 case O(MISC, Sparc22):
1043                         if (devmode != 'E') {
1044                                 pr_err("--sparc2.2 only allowed with --examine\n");
1045                                 exit(2);
1046                         }
1047                         c.SparcAdjust = 1;
1048                         continue;
1049
1050                 case O(ASSEMBLE,'b'): /* here we simply set the bitmap file */
1051                 case O(ASSEMBLE,Bitmap):
1052                         if (!optarg) {
1053                                 pr_err("bitmap file needed with -b in --assemble mode\n");
1054                                 exit(2);
1055                         }
1056                         if (strcmp(optarg, "internal")==0) {
1057                                 pr_err("there is no need to specify --bitmap when assembling arrays with internal bitmaps\n");
1058                                 continue;
1059                         }
1060                         bitmap_fd = open(optarg, O_RDWR);
1061                         if (!*optarg || bitmap_fd < 0) {
1062                                 pr_err("cannot open bitmap file %s: %s\n", optarg, strerror(errno));
1063                                 exit(2);
1064                         }
1065                         ident.bitmap_fd = bitmap_fd; /* for Assemble */
1066                         continue;
1067
1068                 case O(ASSEMBLE, BackupFile):
1069                 case O(GROW, BackupFile):
1070                         /* Specify a file into which grow might place a backup,
1071                          * or from which assemble might recover a backup
1072                          */
1073                         if (c.backup_file) {
1074                                 pr_err("backup file already specified, rejecting %s\n", optarg);
1075                                 exit(2);
1076                         }
1077                         c.backup_file = optarg;
1078                         continue;
1079
1080                 case O(GROW, Continue):
1081                         /* Continue interrupted grow
1082                          */
1083                         grow_continue = 1;
1084                         continue;
1085                 case O(ASSEMBLE, InvalidBackup):
1086                         /* Acknowledge that the backupfile is invalid, but ask
1087                          * to continue anyway
1088                          */
1089                         c.invalid_backup = 1;
1090                         continue;
1091
1092                 case O(BUILD,'b'):
1093                 case O(BUILD,Bitmap):
1094                 case O(CREATE,'b'):
1095                 case O(CREATE,Bitmap): /* here we create the bitmap */
1096                 case O(GROW,'b'):
1097                 case O(GROW,Bitmap):
1098                         if (strcmp(optarg, "internal")== 0 ||
1099                             strcmp(optarg, "none")== 0 ||
1100                             strchr(optarg, '/') != NULL) {
1101                                 s.bitmap_file = optarg;
1102                                 continue;
1103                         }
1104                         /* probable typo */
1105                         pr_err("bitmap file must contain a '/', or be 'internal', or 'none'\n"
1106                                 "       not '%s'\n", optarg);
1107                         exit(2);
1108
1109                 case O(GROW,BitmapChunk):
1110                 case O(BUILD,BitmapChunk):
1111                 case O(CREATE,BitmapChunk): /* bitmap chunksize */
1112                         s.bitmap_chunk = parse_size(optarg);
1113                         if (s.bitmap_chunk == 0 ||
1114                             s.bitmap_chunk == INVALID_SECTORS ||
1115                             s.bitmap_chunk & (s.bitmap_chunk - 1)) {
1116                                 pr_err("invalid bitmap chunksize: %s\n",
1117                                        optarg);
1118                                 exit(2);
1119                         }
1120                         s.bitmap_chunk = s.bitmap_chunk * 512;
1121                         continue;
1122
1123                 case O(GROW, WriteBehind):
1124                 case O(BUILD, WriteBehind):
1125                 case O(CREATE, WriteBehind): /* write-behind mode */
1126                         s.write_behind = DEFAULT_MAX_WRITE_BEHIND;
1127                         if (optarg) {
1128                                 s.write_behind = parse_num(optarg);
1129                                 if (s.write_behind < 0 ||
1130                                     s.write_behind > 16383) {
1131                                         pr_err("Invalid value for maximum outstanding write-behind writes: %s.\n\tMust be between 0 and 16383.\n", optarg);
1132                                         exit(2);
1133                                 }
1134                         }
1135                         continue;
1136
1137                 case O(INCREMENTAL, 'r'):
1138                 case O(INCREMENTAL, RebuildMapOpt):
1139                         rebuild_map = 1;
1140                         continue;
1141                 case O(INCREMENTAL, IncrementalPath):
1142                         remove_path = optarg;
1143                         continue;
1144                 }
1145                 /* We have now processed all the valid options. Anything else is
1146                  * an error
1147                  */
1148                 if (option_index > 0)
1149                         pr_err(":option --%s not valid in %s mode\n",
1150                                 long_options[option_index].name,
1151                                 map_num(modes, mode));
1152                 else
1153                         pr_err("option -%c not valid in %s mode\n",
1154                                 opt, map_num(modes, mode));
1155                 exit(2);
1156
1157         }
1158
1159         if (print_help) {
1160                 char *help_text;
1161                 if (print_help == 2)
1162                         help_text = OptionHelp;
1163                 else
1164                         help_text = mode_help[mode];
1165                 if (help_text == NULL)
1166                         help_text = Help;
1167                 fputs(help_text,stdout);
1168                 exit(0);
1169         }
1170
1171         if (!mode && devs_found) {
1172                 mode = MISC;
1173                 devmode = 'Q';
1174                 if (devlist->disposition == 0)
1175                         devlist->disposition = devmode;
1176         }
1177         if (!mode) {
1178                 fputs(Usage, stderr);
1179                 exit(2);
1180         }
1181
1182         if (symlinks) {
1183                 struct createinfo *ci = conf_get_create_info();
1184
1185                 if (strcasecmp(symlinks, "yes") == 0)
1186                         ci->symlinks = 1;
1187                 else if (strcasecmp(symlinks, "no") == 0)
1188                         ci->symlinks = 0;
1189                 else {
1190                         pr_err("option --symlinks must be 'no' or 'yes'\n");
1191                         exit(2);
1192                 }
1193         }
1194         /* Ok, got the option parsing out of the way
1195          * hopefully it's mostly right but there might be some stuff
1196          * missing
1197          *
1198          * That is mosty checked in the per-mode stuff but...
1199          *
1200          * For @,B,C and A without -s, the first device listed must be
1201          * an md device.  We check that here and open it.
1202          */
1203
1204         if (mode == MANAGE || mode == BUILD || mode == CREATE
1205             || mode == GROW
1206             || (mode == ASSEMBLE && ! c.scan)) {
1207                 if (devs_found < 1) {
1208                         pr_err("an md device must be given in this mode\n");
1209                         exit(2);
1210                 }
1211                 if ((int)ident.super_minor == -2 && c.autof) {
1212                         pr_err("--super-minor=dev is incompatible with --auto\n");
1213                         exit(2);
1214                 }
1215                 if (mode == MANAGE || mode == GROW) {
1216                         mdfd = open_mddev(devlist->devname, 1);
1217                         if (mdfd < 0)
1218                                 exit(1);
1219                 } else
1220                         /* non-existent device is OK */
1221                         mdfd = open_mddev(devlist->devname, 0);
1222                 if (mdfd == -2) {
1223                         pr_err("device %s exists but is not an "
1224                                 "md array.\n", devlist->devname);
1225                         exit(1);
1226                 }
1227                 if ((int)ident.super_minor == -2) {
1228                         struct stat stb;
1229                         if (mdfd < 0) {
1230                                 pr_err("--super-minor=dev given, and "
1231                                         "listed device %s doesn't exist.\n",
1232                                         devlist->devname);
1233                                 exit(1);
1234                         }
1235                         fstat(mdfd, &stb);
1236                         ident.super_minor = minor(stb.st_rdev);
1237                 }
1238                 if (mdfd >= 0 && mode != MANAGE && mode != GROW) {
1239                         /* We don't really want this open yet, we just might
1240                          * have wanted to check some things
1241                          */
1242                         close(mdfd);
1243                         mdfd = -1;
1244                 }
1245         }
1246
1247         if (s.raiddisks) {
1248                 if (s.raiddisks == 1 &&  !c.force && s.level != LEVEL_FAULTY) {
1249                         pr_err("'1' is an unusual number of drives for an array, so it is probably\n"
1250                                 "     a mistake.  If you really mean it you will need to specify --force before\n"
1251                                 "     setting the number of drives.\n");
1252                         exit(2);
1253                 }
1254         }
1255
1256         if (c.homehost == NULL)
1257                 c.homehost = conf_get_homehost(&c.require_homehost);
1258         if (c.homehost == NULL || strcasecmp(c.homehost, "<system>")==0) {
1259                 if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) {
1260                         sys_hostname[sizeof(sys_hostname)-1] = 0;
1261                         c.homehost = sys_hostname;
1262                 }
1263         }
1264         if (c.homehost && (!c.homehost[0] || strcasecmp(c.homehost, "<none>") == 0)) {
1265                 c.homehost = NULL;
1266                 c.require_homehost = 0;
1267         }
1268
1269         if ((mode == MISC && devmode == 'E')
1270             || (mode == MONITOR && spare_sharing == 0))
1271                 /* Anyone may try this */;
1272         else if (geteuid() != 0) {
1273                 pr_err("must be super-user to perform this action\n");
1274                 exit(1);
1275         }
1276
1277         ident.autof = c.autof;
1278
1279         if (c.scan && c.verbose < 2)
1280                 /* --scan implied --brief unless -vv */
1281                 c.brief = 1;
1282
1283         rv = 0;
1284         switch(mode) {
1285         case MANAGE:
1286                 /* readonly, add/remove, readwrite, runstop */
1287                 if (c.readonly > 0)
1288                         rv = Manage_ro(devlist->devname, mdfd, c.readonly);
1289                 if (!rv && devs_found>1)
1290                         rv = Manage_subdevs(devlist->devname, mdfd,
1291                                             devlist->next, c.verbose, c.test,
1292                                             c.update, c.force);
1293                 if (!rv && c.readonly < 0)
1294                         rv = Manage_ro(devlist->devname, mdfd, c.readonly);
1295                 if (!rv && c.runstop)
1296                         rv = Manage_runstop(devlist->devname, mdfd, c.runstop, c.verbose, 0);
1297                 break;
1298         case ASSEMBLE:
1299                 if (devs_found == 1 && ident.uuid_set == 0 &&
1300                     ident.super_minor == UnSet && ident.name[0] == 0 && !c.scan ) {
1301                         /* Only a device has been given, so get details from config file */
1302                         struct mddev_ident *array_ident = conf_get_ident(devlist->devname);
1303                         if (array_ident == NULL) {
1304                                 pr_err("%s not identified in config file.\n",
1305                                         devlist->devname);
1306                                 rv |= 1;
1307                                 if (mdfd >= 0)
1308                                         close(mdfd);
1309                         } else {
1310                                 if (array_ident->autof == 0)
1311                                         array_ident->autof = c.autof;
1312                                 rv |= Assemble(ss, devlist->devname, array_ident,
1313                                                NULL, &c);
1314                         }
1315                 } else if (!c.scan)
1316                         rv = Assemble(ss, devlist->devname, &ident,
1317                                       devlist->next, &c);
1318                 else if (devs_found > 0) {
1319                         if (c.update && devs_found > 1) {
1320                                 pr_err("can only update a single array at a time\n");
1321                                 exit(1);
1322                         }
1323                         if (c.backup_file && devs_found > 1) {
1324                                 pr_err("can only assemble a single array when providing a backup file.\n");
1325                                 exit(1);
1326                         }
1327                         for (dv = devlist ; dv ; dv=dv->next) {
1328                                 struct mddev_ident *array_ident = conf_get_ident(dv->devname);
1329                                 if (array_ident == NULL) {
1330                                         pr_err("%s not identified in config file.\n",
1331                                                 dv->devname);
1332                                         rv |= 1;
1333                                         continue;
1334                                 }
1335                                 if (array_ident->autof == 0)
1336                                         array_ident->autof = c.autof;
1337                                 rv |= Assemble(ss, dv->devname, array_ident,
1338                                                NULL, &c);
1339                         }
1340                 } else {
1341                         if (c.update) {
1342                                 pr_err("--update not meaningful with a --scan assembly.\n");
1343                                 exit(1);
1344                         }
1345                         if (c.backup_file) {
1346                                 pr_err("--backup_file not meaningful with a --scan assembly.\n");
1347                                 exit(1);
1348                         }
1349                         rv = scan_assemble(ss, &c, &ident);
1350                 }
1351
1352                 break;
1353         case BUILD:
1354                 if (c.delay == 0)
1355                         c.delay = DEFAULT_BITMAP_DELAY;
1356                 if (s.write_behind && !s.bitmap_file) {
1357                         pr_err("write-behind mode requires a bitmap.\n");
1358                         rv = 1;
1359                         break;
1360                 }
1361                 if (s.raiddisks == 0) {
1362                         pr_err("no raid-devices specified.\n");
1363                         rv = 1;
1364                         break;
1365                 }
1366
1367                 if (s.bitmap_file) {
1368                         if (strcmp(s.bitmap_file, "internal")==0) {
1369                                 pr_err("'internal' bitmaps not supported with --build\n");
1370                                 rv |= 1;
1371                                 break;
1372                         }
1373                 }
1374                 rv = Build(devlist->devname, devlist->next, &s, &c);
1375                 break;
1376         case CREATE:
1377                 if (c.delay == 0)
1378                         c.delay = DEFAULT_BITMAP_DELAY;
1379                 if (s.write_behind && !s.bitmap_file) {
1380                         pr_err("write-behind mode requires a bitmap.\n");
1381                         rv = 1;
1382                         break;
1383                 }
1384                 if (s.raiddisks == 0) {
1385                         pr_err("no raid-devices specified.\n");
1386                         rv = 1;
1387                         break;
1388                 }
1389
1390                 rv = Create(ss, devlist->devname,
1391                             ident.name, ident.uuid_set ? ident.uuid : NULL,
1392                             devs_found-1, devlist->next,
1393                             &s, &c, data_offset);
1394                 break;
1395         case MISC:
1396                 if (devmode == 'E') {
1397                         if (devlist == NULL && !c.scan) {
1398                                 pr_err("No devices to examine\n");
1399                                 exit(2);
1400                         }
1401                         if (devlist == NULL)
1402                                 devlist = conf_get_devs();
1403                         if (devlist == NULL) {
1404                                 pr_err("No devices listed in %s\n", configfile?configfile:DefaultConfFile);
1405                                 exit(1);
1406                         }
1407                         rv = Examine(devlist, &c, ss);
1408                 } else if (devmode == DetailPlatform) {
1409                         rv = Detail_Platform(ss ? ss->ss : NULL, ss ? c.scan : 1,
1410                                              c.verbose, c.export,
1411                                              devlist ? devlist->devname : NULL);
1412                 } else if (devlist == NULL) {
1413                         if (devmode == 'S' && c.scan)
1414                                 rv = stop_scan(c.verbose);
1415                         else if ((devmode == 'D' || devmode == Waitclean) && c.scan)
1416                                 rv = misc_scan(devmode, &c);
1417                         else if (devmode == UdevRules)
1418                                 rv = Write_rules(udev_filename);
1419                         else {
1420                                 pr_err("No devices given.\n");
1421                                 exit(2);
1422                         }
1423                 } else
1424                         rv = misc_list(devlist, &ident, dump_directory, ss, &c);
1425                 break;
1426         case MONITOR:
1427                 if (!devlist && !c.scan) {
1428                         pr_err("Cannot monitor: need --scan or at least one device\n");
1429                         rv = 1;
1430                         break;
1431                 }
1432                 if (pidfile && !daemonise) {
1433                         pr_err("Cannot write a pid file when not in daemon mode\n");
1434                         rv = 1;
1435                         break;
1436                 }
1437                 if (c.delay == 0) {
1438                         if (get_linux_version() > 2006016)
1439                                 /* mdstat responds to poll */
1440                                 c.delay = 1000;
1441                         else
1442                                 c.delay = 60;
1443                 }
1444                 if (c.delay == 0)
1445                         c.delay = 60;
1446                 rv= Monitor(devlist, mailaddr, program,
1447                             &c, daemonise, oneshot,
1448                             dosyslog, pidfile, increments,
1449                             spare_sharing);
1450                 break;
1451
1452         case GROW:
1453                 if (array_size > 0) {
1454                         /* alway impose array size first, independent of
1455                          * anything else
1456                          * Do not allow level or raid_disks changes at the
1457                          * same time as that can be irreversibly destructive.
1458                          */
1459                         struct mdinfo sra;
1460                         int err;
1461                         if (s.raiddisks || s.level != UnSet) {
1462                                 pr_err("cannot change array size in same operation "
1463                                         "as changing raiddisks or level.\n"
1464                                         "    Change size first, then check that data is still intact.\n");
1465                                 rv = 1;
1466                                 break;
1467                         }
1468                         sysfs_init(&sra, mdfd, NULL);
1469                         if (array_size == MAX_SIZE)
1470                                 err = sysfs_set_str(&sra, NULL, "array_size", "default");
1471                         else
1472                                 err = sysfs_set_num(&sra, NULL, "array_size", array_size / 2);
1473                         if (err < 0) {
1474                                 if (errno == E2BIG)
1475                                         pr_err("--array-size setting"
1476                                                 " is too large.\n");
1477                                 else
1478                                         pr_err("current kernel does"
1479                                                 " not support setting --array-size\n");
1480                                 rv = 1;
1481                                 break;
1482                         }
1483                 }
1484                 if (devs_found > 1 && s.raiddisks == 0) {
1485                         /* must be '-a'. */
1486                         if (s.size > 0 || s.chunk || s.layout_str != NULL || s.bitmap_file) {
1487                                 pr_err("--add cannot be used with "
1488                                         "other geometry changes in --grow mode\n");
1489                                 rv = 1;
1490                                 break;
1491                         }
1492                         for (dv=devlist->next; dv ; dv=dv->next) {
1493                                 rv = Grow_Add_device(devlist->devname, mdfd,
1494                                                      dv->devname);
1495                                 if (rv)
1496                                         break;
1497                         }
1498                 } else if (s.bitmap_file) {
1499                         if (s.size > 0 || s.raiddisks || s.chunk ||
1500                             s.layout_str != NULL || devs_found > 1) {
1501                                 pr_err("--bitmap changes cannot be "
1502                                         "used with other geometry changes "
1503                                         "in --grow mode\n");
1504                                 rv = 1;
1505                                 break;
1506                         }
1507                         if (c.delay == 0)
1508                                 c.delay = DEFAULT_BITMAP_DELAY;
1509                         rv = Grow_addbitmap(devlist->devname, mdfd, &c, &s);
1510                 } else if (grow_continue)
1511                         rv = Grow_continue_command(devlist->devname,
1512                                                    mdfd, c.backup_file,
1513                                                    c.verbose);
1514                 else if (s.size > 0 || s.raiddisks || s.layout_str != NULL
1515                          || s.chunk != 0 || s.level != UnSet) {
1516                         rv = Grow_reshape(devlist->devname, mdfd,
1517                                           devlist->next,
1518                                           data_offset, &c, &s);
1519                 } else if (array_size == 0)
1520                         pr_err("no changes to --grow\n");
1521                 break;
1522         case INCREMENTAL:
1523                 if (rebuild_map) {
1524                         RebuildMap();
1525                 }
1526                 if (c.scan) {
1527                         if (c.runstop <= 0) {
1528                                 pr_err("--incremental --scan meaningless without --run.\n");
1529                                 break;
1530                         }
1531                         if (devmode == 'f') {
1532                                 pr_err("--incremental --scan --fail not supported.\n");
1533                                 break;
1534                         }
1535                         rv = IncrementalScan(c.verbose);
1536                 }
1537                 if (!devlist) {
1538                         if (!rebuild_map && !c.scan) {
1539                                 pr_err("--incremental requires a device.\n");
1540                                 rv = 1;
1541                         }
1542                         break;
1543                 }
1544                 if (devlist->next) {
1545                         pr_err("--incremental can only handle one device.\n");
1546                         rv = 1;
1547                         break;
1548                 }
1549                 if (devmode == 'f')
1550                         rv = IncrementalRemove(devlist->devname, remove_path,
1551                                                c.verbose);
1552                 else
1553                         rv = Incremental(devlist->devname, &c, ss);
1554                 break;
1555         case AUTODETECT:
1556                 autodetect();
1557                 break;
1558         }
1559         exit(rv);
1560 }
1561
1562 static int scan_assemble(struct supertype *ss,
1563                          struct context *c,
1564                          struct mddev_ident *ident)
1565 {
1566         struct mddev_ident *a, *array_list =  conf_get_ident(NULL);
1567         struct mddev_dev *devlist = conf_get_devs();
1568         struct map_ent *map = NULL;
1569         int cnt = 0;
1570         int rv = 0;
1571         int failures, successes;
1572
1573         if (conf_verify_devnames(array_list)) {
1574                 pr_err("Duplicate MD device names in "
1575                        "conf file were found.\n");
1576                 return 1;
1577         }
1578         if (devlist == NULL) {
1579                 pr_err("No devices listed in conf file were found.\n");
1580                 return 1;
1581         }
1582         for (a = array_list; a ; a = a->next) {
1583                 a->assembled = 0;
1584                 if (a->autof == 0)
1585                         a->autof = c->autof;
1586         }
1587         if (map_lock(&map))
1588                 pr_err("%s: failed to get "
1589                        "exclusive lock on mapfile\n",
1590                        __func__);
1591         do {
1592                 failures = 0;
1593                 successes = 0;
1594                 rv = 0;
1595                 for (a = array_list; a ; a = a->next) {
1596                         int r;
1597                         if (a->assembled)
1598                                 continue;
1599                         if (a->devname &&
1600                             strcasecmp(a->devname, "<ignore>") == 0)
1601                                 continue;
1602
1603                         r = Assemble(ss, a->devname,
1604                                      a, NULL, c);
1605                         if (r == 0) {
1606                                 a->assembled = 1;
1607                                 successes++;
1608                         } else
1609                                 failures++;
1610                         rv |= r;
1611                         cnt++;
1612                 }
1613         } while (failures && successes);
1614         if (c->homehost && cnt == 0) {
1615                 /* Maybe we can auto-assemble something.
1616                  * Repeatedly call Assemble in auto-assemble mode
1617                  * until it fails
1618                  */
1619                 int rv2;
1620                 int acnt;
1621                 ident->autof = c->autof;
1622                 do {
1623                         struct mddev_dev *devlist = conf_get_devs();
1624                         acnt = 0;
1625                         do {
1626                                 rv2 = Assemble(ss, NULL,
1627                                                ident,
1628                                                devlist, c);
1629                                 if (rv2==0) {
1630                                         cnt++;
1631                                         acnt++;
1632                                 }
1633                         } while (rv2!=2);
1634                         /* Incase there are stacked devices, we need to go around again */
1635                 } while (acnt);
1636                 if (cnt == 0 && rv == 0) {
1637                         pr_err("No arrays found in config file or automatically\n");
1638                         rv = 1;
1639                 } else if (cnt)
1640                         rv = 0;
1641         } else if (cnt == 0 && rv == 0) {
1642                 pr_err("No arrays found in config file\n");
1643                 rv = 1;
1644         }
1645         map_unlock(&map);
1646         return rv;
1647 }
1648
1649 static int misc_scan(char devmode, struct context *c)
1650 {
1651         /* apply --detail or --wait-clean to
1652          * all devices in /proc/mdstat
1653          */
1654         struct mdstat_ent *ms = mdstat_read(0, 1);
1655         struct mdstat_ent *e;
1656         struct map_ent *map = NULL;
1657         int members;
1658         int rv = 0;
1659
1660         for (members = 0; members <= 1; members++) {
1661                 for (e=ms ; e ; e=e->next) {
1662                         char *name = NULL;
1663                         struct map_ent *me;
1664                         struct stat stb;
1665                         int member = e->metadata_version &&
1666                                 strncmp(e->metadata_version,
1667                                         "external:/", 10) == 0;
1668                         if (members != member)
1669                                 continue;
1670                         me = map_by_devnm(&map, e->devnm);
1671                         if (me && me->path
1672                             && strcmp(me->path, "/unknown") != 0)
1673                                 name = me->path;
1674                         if (name == NULL ||
1675                             stat(name, &stb) != 0)
1676                                 name = get_md_name(e->devnm);
1677
1678                         if (!name) {
1679                                 pr_err("cannot find device file for %s\n",
1680                                         e->dev);
1681                                 continue;
1682                         }
1683                         if (devmode == 'D')
1684                                 rv |= Detail(name, c);
1685                         else
1686                                 rv |= WaitClean(name, -1, c->verbose);
1687                         put_md_name(name);
1688                 }
1689         }
1690         free_mdstat(ms);
1691         return rv;
1692 }
1693
1694 static int stop_scan(int verbose)
1695 {
1696         /* apply --stop to all devices in /proc/mdstat */
1697         /* Due to possible stacking of devices, repeat until
1698          * nothing more can be stopped
1699          */
1700         int progress=1, err;
1701         int last = 0;
1702         int rv = 0;
1703         do {
1704                 struct mdstat_ent *ms = mdstat_read(0, 0);
1705                 struct mdstat_ent *e;
1706
1707                 if (!progress) last = 1;
1708                 progress = 0; err = 0;
1709                 for (e=ms ; e ; e=e->next) {
1710                         char *name = get_md_name(e->devnm);
1711                         int mdfd;
1712
1713                         if (!name) {
1714                                 pr_err("cannot find device file for %s\n",
1715                                         e->dev);
1716                                 continue;
1717                         }
1718                         mdfd = open_mddev(name, 1);
1719                         if (mdfd >= 0) {
1720                                 if (Manage_runstop(name, mdfd, -1, verbose, !last))
1721                                         err = 1;
1722                                 else
1723                                         progress = 1;
1724                                 close(mdfd);
1725                         }
1726
1727                         put_md_name(name);
1728                 }
1729                 free_mdstat(ms);
1730         } while (!last && err);
1731         if (err)
1732                 rv |= 1;
1733         return rv;
1734 }
1735
1736 static int misc_list(struct mddev_dev *devlist,
1737                      struct mddev_ident *ident,
1738                      char *dump_directory,
1739                      struct supertype *ss, struct context *c)
1740 {
1741         struct mddev_dev *dv;
1742         int rv = 0;
1743
1744         for (dv=devlist ; dv; dv=(rv & 16) ? NULL : dv->next) {
1745                 int mdfd;
1746
1747                 switch(dv->disposition) {
1748                 case 'D':
1749                         rv |= Detail(dv->devname, c);
1750                         continue;
1751                 case KillOpt: /* Zero superblock */
1752                         if (ss)
1753                                 rv |= Kill(dv->devname, ss, c->force, c->verbose,0);
1754                         else {
1755                                 int v = c->verbose;
1756                                 do {
1757                                         rv |= Kill(dv->devname, NULL, c->force, v, 0);
1758                                         v = -1;
1759                                 } while (rv == 0);
1760                                 rv &= ~2;
1761                         }
1762                         continue;
1763                 case 'Q':
1764                         rv |= Query(dv->devname); continue;
1765                 case 'X':
1766                         rv |= ExamineBitmap(dv->devname, c->brief, ss); continue;
1767                 case ExamineBB:
1768                         rv |= ExamineBadblocks(dv->devname, c->brief, ss); continue;
1769                 case 'W':
1770                 case WaitOpt:
1771                         rv |= Wait(dv->devname); continue;
1772                 case Waitclean:
1773                         rv |= WaitClean(dv->devname, -1, c->verbose); continue;
1774                 case KillSubarray:
1775                         rv |= Kill_subarray(dv->devname, c->subarray, c->verbose);
1776                         continue;
1777                 case UpdateSubarray:
1778                         if (c->update == NULL) {
1779                                 pr_err("-U/--update must be specified with --update-subarray\n");
1780                                 rv |= 1;
1781                                 continue;
1782                         }
1783                         rv |= Update_subarray(dv->devname, c->subarray,
1784                                               c->update, ident, c->verbose);
1785                         continue;
1786                 case Dump:
1787                         rv |= Dump_metadata(dv->devname, dump_directory, c, ss);
1788                         continue;
1789                 case Restore:
1790                         rv |= Restore_metadata(dv->devname, dump_directory, c, ss,
1791                                                (dv == devlist && dv->next == NULL));
1792                         continue;
1793                 }
1794                 mdfd = open_mddev(dv->devname, 1);
1795                 if (mdfd>=0) {
1796                         switch(dv->disposition) {
1797                         case 'R':
1798                                 rv |= Manage_runstop(dv->devname, mdfd, 1, c->verbose, 0); break;
1799                         case 'S':
1800                                 rv |= Manage_runstop(dv->devname, mdfd, -1, c->verbose, 0); break;
1801                         case 'o':
1802                                 rv |= Manage_ro(dv->devname, mdfd, 1); break;
1803                         case 'w':
1804                                 rv |= Manage_ro(dv->devname, mdfd, -1); break;
1805                         }
1806                         close(mdfd);
1807                 } else
1808                         rv |= 1;
1809         }
1810         return rv;
1811 }