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