mdadm.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   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@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #include "mdadm.h"
  31 #include "md_p.h"
  32 #include <ctype.h>
  33
  34
  35
  36 int main(int argc, char *argv[])
  37 {
  38         int mode = 0;
  39         int opt;
  40         int option_index;
  41         char *help_text;
  42         char *c;
  43         int rv;
  44
  45         int chunk = 0;
  46         int size = -1;
  47         int level = UnSet;
  48         int layout = UnSet;
  49         int raiddisks = 0;
  50         int sparedisks = 0;
  51         struct mddev_ident_s ident;
  52         char *configfile = NULL;
  53         char *cp;
  54         char *update = NULL;
  55         int scan = 0;
  56         char devmode = 0;
  57         int runstop = 0;
  58         int readonly = 0;
  59         int SparcAdjust = 0;
  60         mddev_dev_t devlist = NULL;
  61         mddev_dev_t *devlistend = & devlist;
  62         mddev_dev_t dv;
  63         int devs_found = 0;
  64         int verbose = 0;
  65         int brief = 0;
  66         int force = 0;
  67         int test = 0;
  68         int assume_clean = 0;
  69         int autof = 0; /* -1 for non-partitions, 1 or more to create partitions */
  70
  71         char *mailaddr = NULL;
  72         char *program = NULL;
  73         int delay = 0;
  74         int daemonise = 0;
  75         char *pidfile = NULL;
  76         int oneshot = 0;
  77
  78         int copies;
  79
  80         int mdfd = -1;
  81
  82         ident.uuid_set=0;
  83         ident.level = UnSet;
  84         ident.raid_disks = UnSet;
  85         ident.super_minor= UnSet;
  86         ident.devices=0;
  87         ident.spare_group = NULL;
  88         ident.autof = 0;
  89
  90         while ((option_index = -1) ,
  91                (opt=getopt_long(argc, argv,
  92                                 short_options, long_options,
  93                                 &option_index)) != -1) {
  94                 int newmode = mode;
  95                 /* firstly, so mode-independant options */
  96                 switch(opt) {
  97                 case 'h':
  98                         help_text = Help;
  99                         if (option_index > 0 &&
 100                             strcmp(long_options[option_index].name, "help-options")==0)
 101                                 help_text = OptionHelp;
 102                         else
 103                                 switch (mode) {
 104                                 case ASSEMBLE : help_text = Help_assemble; break;
 105                                 case BUILD    : help_text = Help_build; break;
 106                                 case CREATE   : help_text = Help_create; break;
 107                                 case MANAGE   : help_text = Help_manage; break;
 108                                 case MISC     : help_text = Help_misc; break;
 109                                 case MONITOR  : help_text = Help_monitor; break;
 110                                 case GROW     : help_text = Help_grow; break;
 111                                 }
 112                         fputs(help_text,stderr);
 113                         exit(0);
 114
 115                 case 'V':
 116                         fputs(Version, stderr);
 117                         exit(0);
 118
 119                 case 'v': verbose = 1;
 120                         continue;
 121
 122                 case 'b': brief = 1;
 123                         continue;
 124
 125                 case ':':
 126                 case '?':
 127                         fputs(Usage, stderr);
 128                         exit(2);
 129                 }
 130                 /* second, figure out the mode.
 131                  * Some options force the mode.  Others
 132                  * set the mode if it isn't already
 133                  */
 134
 135                 switch(opt) {
 136                 case '@': /* just incase they say --manage */
 137                         newmode = MANAGE; break;
 138                 case 'a':
 139                 case 'r':
 140                 case 'f':
 141                 case 1 : if (!mode) newmode = MANAGE; break;
 142
 143                 case 'A': newmode = ASSEMBLE; break;
 144                 case 'B': newmode = BUILD; break;
 145                 case 'C': newmode = CREATE; break;
 146                 case 'F': newmode = MONITOR;break;
 147                 case 'G': newmode = GROW; break;
 148
 149                 case '#':
 150                 case 'D':
 151                 case 'E':
 152                 case 'Q': newmode = MISC; break;
 153                 case 'R':
 154                 case 'S':
 155                 case 'o':
 156                 case 'w':
 157                 case 'K': if (!mode) newmode = MISC; break;
 158                 }
 159                 if (mode && newmode == mode) {
 160                         /* everybody happy ! */
 161                 } else if (mode && newmode != mode) {
 162                         /* not allowed.. */
 163                         fprintf(stderr, Name ": ");
 164                         if (option_index >= 0)
 165                                 fprintf(stderr, "--%s", long_options[option_index].name);
 166                         else
 167                                 fprintf(stderr, "-%c", opt);
 168                         fprintf(stderr, " would set mode to %s, but it is already %s.\n",
 169                                 map_num(modes, newmode),
 170                                 map_num(modes, mode));
 171                         exit(2);
 172                 } else if (!mode && newmode) {
 173                         mode = newmode;
 174                 } else {
 175                         /* special case of -c --help */
 176                         if (opt == 'c' &&
 177                             ( strncmp(optarg, "--h", 3)==0 ||
 178                               strncmp(optarg, "-h", 2)==0)) {
 179                                 fputs(Help_config, stderr);
 180                                 exit(0);
 181                         }
 182                         if (option_index >= 0)
 183                                 fprintf(stderr, "--%s", long_options[option_index].name);
 184                         else
 185                                 fprintf(stderr, "-%c", opt);
 186                         fprintf(stderr, " does not set the mode, and so cannot be first.\n");
 187                         exit(2);
 188                 }
 189
 190                 /* if we just set the mode, then done */
 191                 switch(opt) {
 192                 case '@':
 193                 case '#':
 194                 case 'A':
 195                 case 'B':
 196                 case 'C':
 197                 case 'F':
 198                 case 'G':
 199                         continue;
 200                 }
 201                 if (opt == 1) {
 202                         /* an undecorated option - must be a device name.
 203                          */
 204                         if (devs_found > 0 && mode == '@' && !devmode) {
 205                                 fprintf(stderr, Name ": Must give one of -a/-r/-f for subsequent devices at %s\n", optarg);
 206                                 exit(2);
 207                         }
 208                         if (devs_found > 0 && mode == 'G' && !devmode) {
 209                                 fprintf(stderr, Name ": Must give one of -a for devices do add: %s\n", optarg);
 210                                 exit(2);
 211                         }
 212                         dv = malloc(sizeof(*dv));
 213                         if (dv == NULL) {
 214                                 fprintf(stderr, Name ": malloc failed\n");
 215                                 exit(3);
 216                         }
 217                         dv->devname = optarg;
 218                         dv->disposition = devmode;
 219                         dv->next = NULL;
 220                         *devlistend = dv;
 221                         devlistend = &dv->next;
 222
 223                         devs_found++;
 224                         continue;
 225                 }
 226
 227                 /* We've got a mode, and opt is now something else which
 228                  * could depend on the mode */
 229 #define O(a,b) ((a<<8)|b)
 230                 switch (O(mode,opt)) {
 231                 case O(CREATE,'c'):
 232                 case O(BUILD,'c'): /* chunk or rounding */
 233                         if (chunk) {
 234                                 fprintf(stderr, Name ": chunk/rounding may only be specified once. "
 235                                         "Second value is %s.\n", optarg);
 236                                 exit(2);
 237                         }
 238                         chunk = strtol(optarg, &c, 10);
 239                         if (!optarg[0] || *c || chunk<4 || ((chunk-1)&chunk)) {
 240                                 fprintf(stderr, Name ": invalid chunk/rounding value: %s\n",
 241                                         optarg);
 242                                 exit(2);
 243                         }
 244                         continue;
 245
 246                 case O(GROW,'z'):
 247                 case O(CREATE,'z'): /* size */
 248                         if (size >= 0) {
 249                                 fprintf(stderr, Name ": size may only be specified once. "
 250                                         "Second value is %s.\n", optarg);
 251                                 exit(2);
 252                         }
 253                         if (strcmp(optarg, "max")==0)
 254                                 size = 0;
 255                         else {
 256                                 size = strtol(optarg, &c, 10);
 257                                 if (!optarg[0] || *c || size < 4) {
 258                                         fprintf(stderr, Name ": invalid size: %s\n",
 259                                                 optarg);
 260                                         exit(2);
 261                                 }
 262                         }
 263                         continue;
 264
 265                 case O(GROW,'l'): /* hack - needed to understand layout */
 266                 case O(CREATE,'l'):
 267                 case O(BUILD,'l'): /* set raid level*/
 268                         if (level != UnSet) {
 269                                 fprintf(stderr, Name ": raid level may only be set once.  "
 270                                         "Second value is %s.\n", optarg);
 271                                 exit(2);
 272                         }
 273                         level = map_name(pers, optarg);
 274                         if (level == UnSet) {
 275                                 fprintf(stderr, Name ": invalid raid level: %s\n",
 276                                         optarg);
 277                                 exit(2);
 278                         }
 279                         if (level != 0 && level != -1 && level != 1 && level != -4 && level != -5 && mode == BUILD) {
 280                                 fprintf(stderr, Name ": Raid level %s not permitted with --build.\n",
 281                                         optarg);
 282                                 exit(2);
 283                         }
 284                         if (sparedisks > 0 && level < 1 && level >= -1) {
 285                                 fprintf(stderr, Name ": raid level %s is incompatible with spare-devices setting.\n",
 286                                         optarg);
 287                                 exit(2);
 288                         }
 289                         ident.level = level;
 290                         continue;
 291
 292                 case O(CREATE,'p'): /* raid5 layout */
 293                 case O(BUILD,'p'): /* faulty layout */
 294                 case O(GROW, 'p'): /* faulty reconfig */
 295                         if (layout != UnSet) {
 296                                 fprintf(stderr,Name ": layout may only be sent once.  "
 297                                         "Second value was %s\n", optarg);
 298                                 exit(2);
 299                         }
 300                         switch(level) {
 301                         default:
 302                                 fprintf(stderr, Name ": layout not meaningful for %s arrays.\n",
 303                                         map_num(pers, level));
 304                                 exit(2);
 305                         case UnSet:
 306                                 fprintf(stderr, Name ": raid level must be given before layout.\n");
 307                                 exit(2);
 308
 309                         case 5:
 310                         case 6:
 311                                 layout = map_name(r5layout, optarg);
 312                                 if (layout==UnSet) {
 313                                         fprintf(stderr, Name ": layout %s not understood for raid5.\n",
 314                                                 optarg);
 315                                         exit(2);
 316                                 }
 317                                 break;
 318
 319                         case 10:
 320                                 /* 'f' or 'n' followed by a number <= raid_disks */
 321                                 if ((optarg[0] !=  'n' && optarg[0] != 'f') ||
 322                                     (copies = strtoul(optarg+1, &cp, 10)) < 1 ||
 323                                     copies > 200 ||
 324                                     *cp) {
 325                                         fprintf(stderr, Name ": layout for raid10 must be 'nNN' or 'fNN' where NN is a number, not %s\n", optarg);
 326                                         exit(2);
 327                                 }
 328                                 if (optarg[0] == 'n')
 329                                         layout = 256 + copies;
 330                                 else
 331                                         layout = 1 + (copies<<8);
 332                                 break;
 333                         case -5: /* Faulty
 334                                   * modeNNN
 335                                   */
 336
 337                         {
 338                                 int ln = strcspn(optarg, "0123456789");
 339                                 char *m = strdup(optarg);
 340                                 int mode;
 341                                 m[ln] = 0;
 342                                 mode = map_name(faultylayout, m);
 343                                 if (mode == UnSet) {
 344                                         fprintf(stderr, Name ": layout %s not understood for faulty.\n",
 345                                                 optarg);
 346                                         exit(2);
 347                                 }
 348                                 layout = mode | (atoi(optarg+ln)<< ModeShift);
 349                         }
 350                         }
 351                         continue;
 352
 353                 case O(CREATE,3):
 354                 case O(BUILD,3): /* assume clean */
 355                         assume_clean = 1;
 356                         continue;
 357
 358                 case O(GROW,'n'):
 359                 case O(CREATE,'n'):
 360                 case O(BUILD,'n'): /* number of raid disks */
 361                         if (raiddisks) {
 362                                 fprintf(stderr, Name ": raid-devices set twice: %d and %s\n",
 363                                         raiddisks, optarg);
 364                                 exit(2);
 365                         }
 366                         raiddisks = strtol(optarg, &c, 10);
 367                         if (!optarg[0] || *c || raiddisks<=0 || raiddisks > MD_SB_DISKS) {
 368                                 fprintf(stderr, Name ": invalid number of raid devices: %s\n",
 369                                         optarg);
 370                                 exit(2);
 371                         }
 372                         if (raiddisks == 1 &&  !force && level != -5) {
 373                                 fprintf(stderr, Name ": '1' is an unusual number of drives for an array, so it is probably\n"
 374                                         "     a mistake.  If you really mean it you will need to specify --force before\n"
 375                                         "     setting the number of drives.\n");
 376                                 exit(2);
 377                         }
 378                         ident.raid_disks = raiddisks;
 379                         continue;
 380
 381                 case O(CREATE,'x'): /* number of spare (eXtra) discs */
 382                         if (sparedisks) {
 383                                 fprintf(stderr,Name ": spare-devices set twice: %d and %s\n",
 384                                         sparedisks, optarg);
 385                                 exit(2);
 386                         }
 387                         if (level != UnSet && level <= 0 && level >= -1) {
 388                                 fprintf(stderr, Name ": spare-devices setting is incompatible with raid level %d\n",
 389                                         level);
 390                                 exit(2);
 391                         }
 392                         sparedisks = strtol(optarg, &c, 10);
 393                         if (!optarg[0] || *c || sparedisks < 0 || sparedisks > MD_SB_DISKS - raiddisks) {
 394                                 fprintf(stderr, Name ": invalid number of spare-devices: %s\n",
 395                                         optarg);
 396                                 exit(2);
 397                         }
 398                         continue;
 399
 400                 case O(CREATE,'a'):
 401                 case O(BUILD,'a'):
 402                 case O(ASSEMBLE,'a'): /* auto-creation of device node */
 403                         if (optarg == NULL)
 404                                 autof = -1;
 405                         else if (strcasecmp(optarg,"no")==0)
 406                                 autof = 0;
 407                         else if (strcasecmp(optarg,"yes")==0 || strcasecmp(optarg,"md")==0)
 408                                 autof = -1;
 409                         else {
 410                                 /* There might be digits, and maybe a hypen, at the end */
 411                                 char *e = optarg + strlen(optarg);
 412                                 int num = 4;
 413                                 int len;
 414                                 while (e > optarg && isdigit(e[-1]))
 415                                         e--;
 416                                 if (*e) {
 417                                         num = atoi(e);
 418                                         if (num <= 0) num = 1;
 419                                 }
 420                                 if (e > optarg && e[-1] == '-')
 421                                         e--;
 422                                 len = e - optarg;
 423                                 if ((len == 3 && strncasecmp(optarg,"mdp",3)==0) ||
 424                                     (len == 1 && strncasecmp(optarg,"p",1)==0) ||
 425                                     (len >= 4 && strncasecmp(optarg,"part",4)==0))
 426                                         autof = num;
 427                                 else {
 428                                         fprintf(stderr, Name ": --auto flag arg of \"%s\" unrecognised: use no,yes,md,mdp,part\n"
 429                                                 "        optionally followed by a number.\n",
 430                                                 optarg);
 431                                         exit(2);
 432                                 }
 433                         }
 434                         continue;
 435
 436                 case O(BUILD,'f'): /* force honouring '-n 1' */
 437                 case O(CREATE,'f'): /* force honouring of device list */
 438                 case O(ASSEMBLE,'f'): /* force assembly */
 439                 case O(MISC,'f'): /* force zero */
 440                         force=1;
 441                         continue;
 442
 443                         /* now for the Assemble options */
 444                 case O(ASSEMBLE,'u'): /* uuid of array */
 445                         if (ident.uuid_set) {
 446                                 fprintf(stderr, Name ": uuid cannot be set twice.  "
 447                                         "Second value %s.\n", optarg);
 448                                 exit(2);
 449                         }
 450                         if (parse_uuid(optarg, ident.uuid))
 451                                 ident.uuid_set = 1;
 452                         else {
 453                                 fprintf(stderr,Name ": Bad uuid: %s\n", optarg);
 454                                 exit(2);
 455                         }
 456                         continue;
 457
 458                 case O(ASSEMBLE,'m'): /* super-minor for array */
 459                         if (ident.super_minor != UnSet) {
 460                                 fprintf(stderr, Name ": super-minor cannot be set twice.  "
 461                                         "Second value: %s.\n", optarg);
 462                                 exit(2);
 463                         }
 464                         if (strcmp(optarg, "dev")==0)
 465                                 ident.super_minor = -2;
 466                         else {
 467                                 ident.super_minor = strtoul(optarg, &cp, 10);
 468                                 if (!optarg[0] || *cp) {
 469                                         fprintf(stderr, Name ": Bad super-minor number: %s.\n", optarg);
 470                                         exit(2);
 471                                 }
 472                         }
 473                         continue;
 474
 475                 case O(ASSEMBLE,'U'): /* update the superblock */
 476                         if (update) {
 477                                 fprintf(stderr, Name ": Can only update one aspect of superblock, both %s and %s given.\n",
 478                                         update, optarg);
 479                                 exit(2);
 480                         }
 481                         update = optarg;
 482                         if (strcmp(update, "sparc2.2")==0)
 483                                 continue;
 484                         if (strcmp(update, "super-minor") == 0)
 485                                 continue;
 486                         if (strcmp(update, "summaries")==0)
 487                                 continue;
 488                         if (strcmp(update, "resync")==0)
 489                                 continue;
 490                         fprintf(stderr, Name ": '--update %s' invalid.  Only 'sparc2.2', 'super-minor', 'resync' or 'summaries' supported\n",update);
 491                         exit(2);
 492
 493                 case O(ASSEMBLE,'c'): /* config file */
 494                 case O(MISC, 'c'):
 495                 case O(MONITOR,'c'):
 496                         if (configfile) {
 497                                 fprintf(stderr, Name ": configfile cannot be set twice.  "
 498                                         "Second value is %s.\n", optarg);
 499                                 exit(2);
 500                         }
 501                         configfile = optarg;
 502                         /* FIXME possibly check that config file exists.  Even parse it */
 503                         continue;
 504                 case O(ASSEMBLE,'s'): /* scan */
 505                 case O(MISC,'s'):
 506                 case O(MONITOR,'s'):
 507                         scan = 1;
 508                         continue;
 509
 510                 case O(MONITOR,'m'): /* mail address */
 511                         if (mailaddr)
 512                                 fprintf(stderr, Name ": only specify one mailaddress. %s ignored.\n",
 513                                         optarg);
 514                         else
 515                                 mailaddr = optarg;
 516                         continue;
 517
 518                 case O(MONITOR,'p'): /* alert program */
 519                         if (program)
 520                                 fprintf(stderr, Name ": only specify one alter program. %s ignored.\n",
 521                                         optarg);
 522                         else
 523                                 program = optarg;
 524                         continue;
 525
 526                 case O(MONITOR,'d'): /* delay in seconds */
 527                         if (delay)
 528                                 fprintf(stderr, Name ": only specify delay once. %s ignored.\n",
 529                                         optarg);
 530                         else {
 531                                 delay = strtol(optarg, &c, 10);
 532                                 if (!optarg[0] || *c || delay<1) {
 533                                         fprintf(stderr, Name ": invalid delay: %s\n",
 534                                                 optarg);
 535                                         exit(2);
 536                                 }
 537                         }
 538                         continue;
 539                 case O(MONITOR,'f'): /* daemonise */
 540                         daemonise = 1;
 541                         continue;
 542                 case O(MONITOR,'i'): /* pid */
 543                         if (pidfile)
 544                                 fprintf(stderr, Name ": only specify one pid file. %s ignored.\n",
 545                                         optarg);
 546                         else
 547                                 pidfile = optarg;
 548                         continue;
 549                 case O(MONITOR,'1'): /* oneshot */
 550                         oneshot = 1;
 551                         continue;
 552                 case O(MONITOR,'t'): /* test */
 553                         test = 1;
 554                         continue;
 555
 556                         /* now the general management options.  Some are applicable
 557                          * to other modes. None have arguments.
 558                          */
 559                 case O(GROW,'a'):
 560                 case O(MANAGE,'a'): /* add a drive */
 561                         devmode = 'a';
 562                         continue;
 563                 case O(MANAGE,'r'): /* remove a drive */
 564                         devmode = 'r';
 565                         continue;
 566                 case O(MANAGE,'f'): /* set faulty */
 567                         devmode = 'f';
 568                         continue;
 569                 case O(MANAGE,'R'):
 570                 case O(ASSEMBLE,'R'):
 571                 case O(BUILD,'R'):
 572                 case O(CREATE,'R'): /* Run the array */
 573                         if (runstop < 0) {
 574                                 fprintf(stderr, Name ": Cannot both Stop and Run an array\n");
 575                                 exit(2);
 576                         }
 577                         runstop = 1;
 578                         continue;
 579                 case O(MANAGE,'S'):
 580                         if (runstop > 0) {
 581                                 fprintf(stderr, Name ": Cannot both Run and Stop an array\n");
 582                                 exit(2);
 583                         }
 584                         runstop = -1;
 585                         continue;
 586
 587                 case O(MANAGE,'o'):
 588                         if (readonly < 0) {
 589                                 fprintf(stderr, Name ": Cannot have both readonly and readwrite\n");
 590                                 exit(2);
 591                         }
 592                         readonly = 1;
 593                         continue;
 594                 case O(MANAGE,'w'):
 595                         if (readonly > 0) {
 596                                 fprintf(stderr, Name ": Cannot have both readwrite and readonly.\n");
 597                                 exit(2);
 598                         }
 599                         readonly = -1;
 600                         continue;
 601
 602                 case O(MISC,'Q'):
 603                 case O(MISC,'D'):
 604                 case O(MISC,'E'):
 605                 case O(MISC,'K'):
 606                 case O(MISC,'R'):
 607                 case O(MISC,'S'):
 608                 case O(MISC,'o'):
 609                 case O(MISC,'w'):
 610                         if (devmode && devmode != opt &&
 611                             (devmode == 'E' || (opt == 'E' && devmode != 'Q'))) {
 612                                 fprintf(stderr, Name ": --examine/-E cannot be given with -%c\n",
 613                                         devmode =='E'?opt:devmode);
 614                                 exit(2);
 615                         }
 616                         devmode = opt;
 617                         continue;
 618                 case O(MISC,'t'):
 619                         test = 1;
 620                         continue;
 621
 622                 case O(MISC, 22):
 623                         if (devmode != 'E') {
 624                                 fprintf(stderr, Name ": --sparc2.2 only allowed with --examine\n");
 625                                 exit(2);
 626                         }
 627                         SparcAdjust = 1;
 628                         continue;
 629                 }
 630                 /* We have now processed all the valid options. Anything else is
 631                  * an error
 632                  */
 633                 fprintf(stderr, Name ": option %c not valid in %s mode\n",
 634                         opt, map_num(modes, mode));
 635                 exit(2);
 636
 637         }
 638
 639         if (!mode) {
 640                 fputs(Usage, stderr);
 641                 exit(2);
 642         }
 643         /* Ok, got the option parsing out of the way
 644          * hopefully it's mostly right but there might be some stuff
 645          * missing
 646          *
 647          * That is mosty checked in the per-mode stuff but...
 648          *
 649          * For @,B,C  and A without -s, the first device listed must be an md device
 650          * we check that here and open it.
 651          */
 652
 653         if (mode==MANAGE || mode == BUILD || mode == CREATE || mode == GROW ||
 654             (mode == ASSEMBLE && ! scan)) {
 655                 if (devs_found < 1) {
 656                         fprintf(stderr, Name ": an md device must be given in this mode\n");
 657                         exit(2);
 658                 }
 659                 if ((int)ident.super_minor == -2 && autof) {
 660                         fprintf(stderr, Name ": --super-minor=dev is incompatible with --auto\n");
 661                         exit(2);
 662                 }
 663                 mdfd = open_mddev(devlist->devname, autof);
 664                 if (mdfd < 0)
 665                         exit(1);
 666                 if ((int)ident.super_minor == -2) {
 667                         struct stat stb;
 668                         fstat(mdfd, &stb);
 669                         ident.super_minor = MINOR(stb.st_rdev);
 670                 }
 671         }
 672
 673         rv = 0;
 674         switch(mode) {
 675         case MANAGE:
 676                 /* readonly, add/remove, readwrite, runstop */
 677                 if (readonly>0)
 678                         rv = Manage_ro(devlist->devname, mdfd, readonly);
 679                 if (!rv && devs_found>1)
 680                         rv = Manage_subdevs(devlist->devname, mdfd,
 681                                             devlist->next);
 682                 if (!rv && readonly < 0)
 683                         rv = Manage_ro(devlist->devname, mdfd, readonly);
 684                 if (!rv && runstop)
 685                         rv = Manage_runstop(devlist->devname, mdfd, runstop);
 686                 break;
 687         case ASSEMBLE:
 688                 if (devs_found == 1 && ident.uuid_set == 0 &&
 689                     ident.super_minor == UnSet && !scan ) {
 690                         /* Only a device has been given, so get details from config file */
 691                         mddev_ident_t array_ident = conf_get_ident(configfile, devlist->devname);
 692                         if (array_ident == NULL) {
 693                                 fprintf(stderr, Name ": %s not identified in config file.\n",
 694                                         devlist->devname);
 695                                 rv |= 1;
 696                         } else {
 697                                 mdfd = open_mddev(devlist->devname, array_ident->autof);
 698                                 if (mdfd < 0)
 699                                         rv |= 1;
 700                                 else {
 701                                         rv |= Assemble(devlist->devname, mdfd, array_ident, configfile,
 702                                                        NULL,
 703                                                        readonly, runstop, update, verbose, force);
 704                                         close(mdfd);
 705                                 }
 706                         }
 707                 } else if (!scan)
 708                         rv = Assemble(devlist->devname, mdfd, &ident, configfile,
 709                                       devlist->next,
 710                                       readonly, runstop, update, verbose, force);
 711                 else if (devs_found>0) {
 712                         if (update && devs_found > 1) {
 713                                 fprintf(stderr, Name ": can only update a single array at a time\n");
 714                                 exit(1);
 715                         }
 716                         for (dv = devlist ; dv ; dv=dv->next) {
 717                                 mddev_ident_t array_ident = conf_get_ident(configfile, dv->devname);
 718                                 if (array_ident == NULL) {
 719                                         fprintf(stderr, Name ": %s not identified in config file.\n",
 720                                                 dv->devname);
 721                                         rv |= 1;
 722                                         continue;
 723                                 }
 724                                 mdfd = open_mddev(dv->devname, array_ident->autof);
 725                                 if (mdfd < 0) {
 726                                         rv |= 1;
 727                                         continue;
 728                                 }
 729                                 rv |= Assemble(dv->devname, mdfd, array_ident, configfile,
 730                                                NULL,
 731                                                readonly, runstop, update, verbose, force);
 732                                 close(mdfd);
 733                         }
 734                 } else {
 735                         mddev_ident_t array_list =  conf_get_ident(configfile, NULL);
 736                         if (!array_list) {
 737                                 fprintf(stderr, Name ": No arrays found in config file\n");
 738                                 rv = 1;
 739                         } else
 740                                 for (; array_list; array_list = array_list->next) {
 741                                         mdu_array_info_t array;
 742                                         mdfd = open_mddev(array_list->devname, array_list->autof);
 743                                         if (mdfd < 0) {
 744                                                 rv |= 1;
 745                                                 continue;
 746                                         }
 747                                         if (ioctl(mdfd, GET_ARRAY_INFO, &array)>=0)
 748                                                 /* already assembled, skip */
 749                                                 continue;
 750                                         rv |= Assemble(array_list->devname, mdfd,
 751                                                        array_list, configfile,
 752                                                        NULL,
 753                                                        readonly, runstop, NULL, verbose, force);
 754                                 }
 755                 }
 756                 break;
 757         case BUILD:
 758                 rv = Build(devlist->devname, mdfd, chunk, level, layout, raiddisks, devlist->next, assume_clean);
 759                 break;
 760         case CREATE:
 761                 rv = Create(devlist->devname, mdfd, chunk, level, layout, size<0 ? 0 : size,
 762                             raiddisks, sparedisks,
 763                             devs_found-1, devlist->next, runstop, verbose, force);
 764                 break;
 765         case MISC:
 766
 767                 if (devmode == 'E') {
 768                         if (devlist == NULL && !scan) {
 769                                 fprintf(stderr, Name ": No devices to examine\n");
 770                                 exit(2);
 771                         }
 772                         if (devlist == NULL)
 773                                 devlist = conf_get_devs(configfile);
 774                         if (devlist == NULL) {
 775                                 fprintf(stderr, Name ": No devices listed in %s\n", configfile?configfile:DefaultConfFile);
 776                                 exit(1);
 777                         }
 778                         rv = Examine(devlist, scan?!verbose:brief, scan, SparcAdjust);
 779                 } else {
 780                         if (devlist == NULL) {
 781                                 if ((devmode == 'S' ||devmode=='D') && scan) {
 782                                         /* apply to all devices in /proc/mdstat */
 783                                         struct mdstat_ent *ms = mdstat_read(0);
 784                                         struct mdstat_ent *e;
 785                                         for (e=ms ; e ; e=e->next) {
 786                                                 char *name = get_md_name(e->devnum);
 787
 788                                                 if (!name) {
 789                                                         fprintf(stderr, Name ": cannot find device file for %s\n",
 790                                                                 e->dev);
 791                                                         continue;
 792                                                 }
 793                                                 if (devmode == 'D')
 794                                                         rv |= Detail(name, !verbose, test);
 795                                                 else if (devmode=='S') {
 796                                                         mdfd = open_mddev(name, 0);
 797                                                         if (mdfd >= 0)
 798                                                                 rv |= Manage_runstop(name, mdfd, -1);
 799                                                 }
 800                                                 put_md_name(name);
 801                                         }
 802                                 } else {
 803                                         fprintf(stderr, Name ": No devices given.\n");
 804                                         exit(2);
 805                                 }
 806                         }
 807                         for (dv=devlist ; dv; dv=dv->next) {
 808                                 switch(dv->disposition) {
 809                                 case 'D':
 810                                         rv |= Detail(dv->devname, brief, test); continue;
 811                                 case 'K': /* Zero superblock */
 812                                         rv |= Kill(dv->devname, force); continue;
 813                                 case 'Q':
 814                                         rv |= Query(dv->devname); continue;
 815                                 }
 816                                 mdfd = open_mddev(dv->devname, 0);
 817                                 if (mdfd>=0)
 818                                         switch(dv->disposition) {
 819                                         case 'R':
 820                                                 rv |= Manage_runstop(dv->devname, mdfd, 1); break;
 821                                         case 'S':
 822                                                 rv |= Manage_runstop(dv->devname, mdfd, -1); break;
 823                                         case 'o':
 824                                                 rv |= Manage_ro(dv->devname, mdfd, 1); break;
 825                                         case 'w':
 826                                                 rv |= Manage_ro(dv->devname, mdfd, -1); break;
 827                                         }
 828                         }
 829                 }
 830                 break;
 831         case MONITOR:
 832                 if (!devlist && !scan) {
 833                         fprintf(stderr, Name ": Cannot monitor: need --scan or at least one device\n");
 834                         rv = 1;
 835                         break;
 836                 }
 837                 if (pidfile && !daemonise) {
 838                         fprintf(stderr, Name ": Cannot write a pid file when not in daemon mode\n");
 839                         rv = 1;
 840                         break;
 841                 }
 842                 rv= Monitor(devlist, mailaddr, program,
 843                             delay?delay:60, daemonise, scan, oneshot, configfile, test, pidfile);
 844                 break;
 845
 846         case GROW:
 847                 if (devs_found > 1) {
 848
 849                         /* must be '-a'. */
 850                         if (size >= 0 || raiddisks) {
 851                                 fprintf(stderr, Name ": --size, --raiddisks, and --add are exclusing in --grow mode\n");
 852                                 rv = 1;
 853                                 break;
 854                         }
 855                         for (dv=devlist->next; dv ; dv=dv->next) {
 856                                 rv = Grow_Add_device(devlist->devname, mdfd, dv->devname);
 857                                 if (rv)
 858                                         break;
 859                         }
 860                 } else if ((size >= 0) + (raiddisks != 0) +  (layout != UnSet) > 1) {
 861                         fprintf(stderr, Name ": can change at most one of size, raiddisks, and layout\n");
 862                         rv = 1;
 863                         break;
 864                 } else if (layout != UnSet)
 865                         rv = Manage_reconfig(devlist->devname, mdfd, layout);
 866                 else if (size >= 0 || raiddisks)
 867                         rv = Manage_resize(devlist->devname, mdfd, size, raiddisks);
 868                 else
 869                         fprintf(stderr, Name ": no changes to --grow\n");
 870                 break;
 871         }
 872         exit(rv);
 873 }