config.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 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
  25 #include        "mdadm.h"
  26 #include        "dlink.h"
  27 #include        <dirent.h>
  28 #include        <glob.h>
  29 #include        <fnmatch.h>
  30 #include        <ctype.h>
  31 #include        <pwd.h>
  32 #include        <grp.h>
  33
  34 /*
  35  * Read the config file
  36  *
  37  * conf_get_uuids gets a list of devicename+uuid pairs
  38  * conf_get_devs gets device names after expanding wildcards
  39  *
  40  * Each keeps the returned list and frees it when asked to make
  41  * a new list.
  42  *
  43  * The format of the config file needs to be fairly extensible.
  44  * Now, arrays only have names and uuids and devices merely are.
  45  * But later arrays might want names, and devices might want superblock
  46  * versions, and who knows what else.
  47  * I like free format, abhore backslash line continuation, adore
  48  *   indentation for structure and am ok about # comments.
  49  *
  50  * So, each line that isn't blank or a #comment must either start
  51  *  with a key word, and not be indented, or must start with a
  52  *  non-key-word and must be indented.
  53  *
  54  * Keywords are DEVICE and ARRAY ... and several others.
  55  * DEV{ICE} introduces some devices that might contain raid components.
  56  * e.g.
  57  *   DEV style=0 /dev/sda* /dev/hd*
  58  *   DEV style=1 /dev/sd[b-f]*
  59  * ARR{AY} describes an array giving md device and attributes like uuid=whatever
  60  * e.g.
  61  *   ARRAY /dev/md0 uuid=whatever name=something
  62  * Spaces separate words on each line.  Quoting, with "" or '' protects them,
  63  * but may not wrap over lines
  64  *
  65  */
  66
  67 #ifndef CONFFILE
  68 #define CONFFILE "/etc/mdadm.conf"
  69 #endif
  70 #ifndef CONFFILE2
  71 /* for Debian compatibility .... */
  72 #define CONFFILE2 "/etc/mdadm/mdadm.conf"
  73 #endif
  74 char DefaultConfFile[] = CONFFILE;
  75 char DefaultAltConfFile[] = CONFFILE2;
  76
  77 enum linetype { Devices, Array, Mailaddr, Mailfrom, Program, CreateDev,
  78                 Homehost, AutoMode, Policy, PartPolicy, LTEnd };
  79 char *keywords[] = {
  80         [Devices]  = "devices",
  81         [Array]    = "array",
  82         [Mailaddr] = "mailaddr",
  83         [Mailfrom] = "mailfrom",
  84         [Program]  = "program",
  85         [CreateDev]= "create",
  86         [Homehost] = "homehost",
  87         [AutoMode] = "auto",
  88         [Policy]   = "policy",
  89         [PartPolicy]="part-policy",
  90         [LTEnd]    = NULL
  91 };
  92
  93 /*
  94  * match_keyword returns an index into the keywords array, or -1 for no match
  95  * case is ignored, and at least three characters must be given
  96  */
  97
  98 int match_keyword(char *word)
  99 {
 100         int len = strlen(word);
 101         int n;
 102
 103         if (len < 3) return -1;
 104         for (n=0; keywords[n]; n++) {
 105                 if (strncasecmp(word, keywords[n], len)==0)
 106                         return n;
 107         }
 108         return -1;
 109 }
 110
 111 /*
 112  * conf_line reads one logical line from the conffile.
 113  * It skips comments and continues until it finds a line that starts
 114  * with a non blank/comment.  This character is pushed back for the next call
 115  * A doubly linked list of words is returned.
 116  * the first word will be a keyword.  Other words will have had quotes removed.
 117  */
 118
 119 char *conf_line(FILE *file)
 120 {
 121         char *w;
 122         char *list;
 123
 124         w = conf_word(file, 1);
 125         if (w == NULL) return NULL;
 126
 127         list = dl_strdup(w);
 128         free(w);
 129         dl_init(list);
 130
 131         while ((w = conf_word(file,0))){
 132                 char *w2 = dl_strdup(w);
 133                 free(w);
 134                 dl_add(list, w2);
 135         }
 136 /*    printf("got a line\n");*/
 137         return list;
 138 }
 139
 140 void free_line(char *line)
 141 {
 142         char *w;
 143         for (w=dl_next(line); w != line; w=dl_next(line)) {
 144                 dl_del(w);
 145                 dl_free(w);
 146         }
 147         dl_free(line);
 148 }
 149
 150 struct conf_dev {
 151         struct conf_dev *next;
 152         char *name;
 153 } *cdevlist = NULL;
 154
 155 struct mddev_dev *load_partitions(void)
 156 {
 157         FILE *f = fopen("/proc/partitions", "r");
 158         char buf[1024];
 159         struct mddev_dev *rv = NULL;
 160         if (f == NULL) {
 161                 pr_err("cannot open /proc/partitions\n");
 162                 return NULL;
 163         }
 164         while (fgets(buf, 1024, f)) {
 165                 int major, minor;
 166                 char *name, *mp;
 167                 struct mddev_dev *d;
 168
 169                 buf[1023] = '\0';
 170                 if (buf[0] != ' ')
 171                         continue;
 172                 major = strtoul(buf, &mp, 10);
 173                 if (mp == buf || *mp != ' ')
 174                         continue;
 175                 minor = strtoul(mp, NULL, 10);
 176
 177                 name = map_dev(major, minor, 1);
 178                 if (!name)
 179                         continue;
 180                 d = xmalloc(sizeof(*d));
 181                 memset(d, 0, sizeof(*d));
 182                 d->devname = xstrdup(name);
 183                 d->next = rv;
 184                 rv = d;
 185         }
 186         fclose(f);
 187         return rv;
 188 }
 189
 190 struct mddev_dev *load_containers(void)
 191 {
 192         struct mdstat_ent *mdstat = mdstat_read(1, 0);
 193         struct mdstat_ent *ent;
 194         struct mddev_dev *d;
 195         struct mddev_dev *rv = NULL;
 196
 197         if (!mdstat)
 198                 return NULL;
 199
 200         for (ent = mdstat; ent; ent = ent->next)
 201                 if (ent->metadata_version &&
 202                     strncmp(ent->metadata_version, "external:", 9) == 0 &&
 203                     !is_subarray(&ent->metadata_version[9])) {
 204                         d = xmalloc(sizeof(*d));
 205                         memset(d, 0, sizeof(*d));
 206                         if (asprintf(&d->devname, "/dev/%s", ent->dev) < 0) {
 207                                 free(d);
 208                                 continue;
 209                         }
 210                         d->next = rv;
 211                         rv = d;
 212                 }
 213         free_mdstat(mdstat);
 214
 215         return rv;
 216 }
 217
 218 struct createinfo createinfo = {
 219         .autof = 2, /* by default, create devices with standard names */
 220         .symlinks = 1,
 221         .names = 0, /* By default, stick with numbered md devices. */
 222 #ifdef DEBIAN
 223         .gid = 6, /* disk */
 224         .mode = 0660,
 225 #else
 226         .mode = 0600,
 227 #endif
 228 };
 229
 230 int parse_auto(char *str, char *msg, int config)
 231 {
 232         int autof;
 233         if (str == NULL || *str == 0)
 234                 autof = 2;
 235         else if (strcasecmp(str,"no")==0)
 236                 autof = 1;
 237         else if (strcasecmp(str,"yes")==0)
 238                 autof = 2;
 239         else if (strcasecmp(str,"md")==0)
 240                 autof = config?5:3;
 241         else {
 242                 /* There might be digits, and maybe a hypen, at the end */
 243                 char *e = str + strlen(str);
 244                 int num = 4;
 245                 int len;
 246                 while (e > str && isdigit(e[-1]))
 247                         e--;
 248                 if (*e) {
 249                         num = atoi(e);
 250                         if (num <= 0) num = 1;
 251                 }
 252                 if (e > str && e[-1] == '-')
 253                         e--;
 254                 len = e - str;
 255                 if ((len == 2 && strncasecmp(str,"md",2)==0)) {
 256                         autof = config ? 5 : 3;
 257                 } else if ((len == 3 && strncasecmp(str,"yes",3)==0)) {
 258                         autof = 2;
 259                 } else if ((len == 3 && strncasecmp(str,"mdp",3)==0)) {
 260                         autof = config ? 6 : 4;
 261                 } else if ((len == 1 && strncasecmp(str,"p",1)==0) ||
 262                            (len >= 4 && strncasecmp(str,"part",4)==0)) {
 263                         autof = 6;
 264                 } else {
 265                         pr_err("%s arg of \"%s\" unrecognised: use no,yes,md,mdp,part\n"
 266                                 "        optionally followed by a number.\n",
 267                                 msg, str);
 268                         exit(2);
 269                 }
 270                 autof |= num << 3;
 271         }
 272         return autof;
 273 }
 274
 275 static void createline(char *line)
 276 {
 277         char *w;
 278         char *ep;
 279
 280         for (w=dl_next(line); w!=line; w=dl_next(w)) {
 281                 if (strncasecmp(w, "auto=", 5) == 0)
 282                         createinfo.autof = parse_auto(w+5, "auto=", 1);
 283                 else if (strncasecmp(w, "owner=", 6) == 0) {
 284                         if (w[6] == 0) {
 285                                 pr_err("missing owner name\n");
 286                                 continue;
 287                         }
 288                         createinfo.uid = strtoul(w+6, &ep, 10);
 289                         if (*ep != 0) {
 290                                 struct passwd *pw;
 291                                 /* must be a name */
 292                                 pw = getpwnam(w+6);
 293                                 if (pw)
 294                                         createinfo.uid = pw->pw_uid;
 295                                 else
 296                                         pr_err("CREATE user %s not found\n", w+6);
 297                         }
 298                 } else if (strncasecmp(w, "group=", 6) == 0) {
 299                         if (w[6] == 0) {
 300                                 pr_err("missing group name\n");
 301                                 continue;
 302                         }
 303                         createinfo.gid = strtoul(w+6, &ep, 10);
 304                         if (*ep != 0) {
 305                                 struct group *gr;
 306                                 /* must be a name */
 307                                 gr = getgrnam(w+6);
 308                                 if (gr)
 309                                         createinfo.gid = gr->gr_gid;
 310                                 else
 311                                         pr_err("CREATE group %s not found\n", w+6);
 312                         }
 313                 } else if (strncasecmp(w, "mode=", 5) == 0) {
 314                         if (w[5] == 0) {
 315                                 pr_err("missing CREATE mode\n");
 316                                 continue;
 317                         }
 318                         createinfo.mode = strtoul(w+5, &ep, 8);
 319                         if (*ep != 0) {
 320                                 createinfo.mode = 0600;
 321                                 pr_err("unrecognised CREATE mode %s\n",
 322                                         w+5);
 323                         }
 324                 } else if (strncasecmp(w, "metadata=", 9) == 0) {
 325                         /* style of metadata to use by default */
 326                         int i;
 327                         for (i=0; superlist[i] && !createinfo.supertype; i++)
 328                                 createinfo.supertype =
 329                                         superlist[i]->match_metadata_desc(w+9);
 330                         if (!createinfo.supertype)
 331                                 pr_err("metadata format %s unknown, ignoring\n",
 332                                         w+9);
 333                 } else if (strncasecmp(w, "symlinks=yes", 12) == 0)
 334                         createinfo.symlinks = 1;
 335                 else if  (strncasecmp(w, "symlinks=no", 11) == 0)
 336                         createinfo.symlinks = 0;
 337                 else if (strncasecmp(w, "names=yes", 12) == 0)
 338                         createinfo.names = 1;
 339                 else if  (strncasecmp(w, "names=no", 11) == 0)
 340                         createinfo.names = 0;
 341                 else {
 342                         pr_err("unrecognised word on CREATE line: %s\n",
 343                                 w);
 344                 }
 345         }
 346 }
 347
 348 void devline(char *line)
 349 {
 350         char *w;
 351         struct conf_dev *cd;
 352
 353         for (w=dl_next(line); w != line; w=dl_next(w)) {
 354                 if (w[0] == '/' || strcasecmp(w, "partitions") == 0 ||
 355                     strcasecmp(w, "containers") == 0) {
 356                         cd = xmalloc(sizeof(*cd));
 357                         cd->name = xstrdup(w);
 358                         cd->next = cdevlist;
 359                         cdevlist = cd;
 360                 } else {
 361                         pr_err("unreconised word on DEVICE line: %s\n",
 362                                 w);
 363                 }
 364         }
 365 }
 366
 367 struct mddev_ident *mddevlist = NULL;
 368 struct mddev_ident **mddevlp = &mddevlist;
 369
 370 static int is_number(char *w)
 371 {
 372         /* check if there are 1 or more digits and nothing else */
 373         int digits = 0;
 374         while (*w && isdigit(*w)) {
 375                 digits++;
 376                 w++;
 377         }
 378         return (digits && ! *w);
 379 }
 380
 381 void arrayline(char *line)
 382 {
 383         char *w;
 384
 385         struct mddev_ident mis;
 386         struct mddev_ident *mi;
 387
 388         mis.uuid_set = 0;
 389         mis.super_minor = UnSet;
 390         mis.level = UnSet;
 391         mis.raid_disks = UnSet;
 392         mis.spare_disks = 0;
 393         mis.devices = NULL;
 394         mis.devname = NULL;
 395         mis.spare_group = NULL;
 396         mis.autof = 0;
 397         mis.next = NULL;
 398         mis.st = NULL;
 399         mis.bitmap_fd = -1;
 400         mis.bitmap_file = NULL;
 401         mis.name[0] = 0;
 402         mis.container = NULL;
 403         mis.member = NULL;
 404
 405         for (w=dl_next(line); w!=line; w=dl_next(w)) {
 406                 if (w[0] == '/' || strchr(w, '=') == NULL) {
 407                         /* This names the device, or is '<ignore>'.
 408                          * The rules match those in create_mddev.
 409                          * 'w' must be:
 410                          *  /dev/md/{anything}
 411                          *  /dev/mdNN
 412                          *  /dev/md_dNN
 413                          *  <ignore>
 414                          *  or anything that doesn't start '/' or '<'
 415                          */
 416                         if (strcasecmp(w, "<ignore>") == 0 ||
 417                             strncmp(w, "/dev/md/", 8) == 0 ||
 418                             (w[0] != '/' && w[0] != '<') ||
 419                             (strncmp(w, "/dev/md", 7) == 0 &&
 420                              is_number(w+7)) ||
 421                             (strncmp(w, "/dev/md_d", 9) == 0 &&
 422                              is_number(w+9))
 423                                 ) {
 424                                 /* This is acceptable */;
 425                                 if (mis.devname)
 426                                         pr_err("only give one "
 427                                                 "device per ARRAY line: %s and %s\n",
 428                                                 mis.devname, w);
 429                                 else
 430                                         mis.devname = w;
 431                         }else {
 432                                 pr_err("%s is an invalid name for "
 433                                         "an md device - ignored.\n", w);
 434                         }
 435                 } else if (strncasecmp(w, "uuid=", 5)==0 ) {
 436                         if (mis.uuid_set)
 437                                 pr_err("only specify uuid once, %s ignored.\n",
 438                                         w);
 439                         else {
 440                                 if (parse_uuid(w+5, mis.uuid))
 441                                         mis.uuid_set = 1;
 442                                 else
 443                                         pr_err("bad uuid: %s\n", w);
 444                         }
 445                 } else if (strncasecmp(w, "super-minor=", 12)==0 ) {
 446                         if (mis.super_minor != UnSet)
 447                                 pr_err("only specify super-minor once, %s ignored.\n",
 448                                         w);
 449                         else {
 450                                 char *endptr;
 451                                 int minor = strtol(w+12, &endptr, 10);
 452
 453                                 if (w[12]==0 || endptr[0]!=0 || minor < 0)
 454                                         pr_err("invalid super-minor number: %s\n",
 455                                                 w);
 456                                 else
 457                                         mis.super_minor = minor;
 458                         }
 459                 } else if (strncasecmp(w, "name=", 5)==0) {
 460                         if (mis.name[0])
 461                                 pr_err("only specify name once, %s ignored.\n",
 462                                         w);
 463                         else if (strlen(w+5) > 32)
 464                                 pr_err("name too long, ignoring %s\n", w);
 465                         else
 466                                 strcpy(mis.name, w+5);
 467
 468                 } else if (strncasecmp(w, "bitmap=", 7) == 0) {
 469                         if (mis.bitmap_file)
 470                                 pr_err("only specify bitmap file once. %s ignored\n",
 471                                         w);
 472                         else
 473                                 mis.bitmap_file = xstrdup(w+7);
 474
 475                 } else if (strncasecmp(w, "devices=", 8 ) == 0 ) {
 476                         if (mis.devices)
 477                                 pr_err("only specify devices once (use a comma separated list). %s ignored\n",
 478                                         w);
 479                         else
 480                                 mis.devices = xstrdup(w+8);
 481                 } else if (strncasecmp(w, "spare-group=", 12) == 0 ) {
 482                         if (mis.spare_group)
 483                                 pr_err("only specify one spare group per array. %s ignored.\n",
 484                                         w);
 485                         else
 486                                 mis.spare_group = xstrdup(w+12);
 487                 } else if (strncasecmp(w, "level=", 6) == 0 ) {
 488                         /* this is mainly for compatability with --brief output */
 489                         mis.level = map_name(pers, w+6);
 490                 } else if (strncasecmp(w, "disks=", 6) == 0 ) {
 491                         /* again, for compat */
 492                         mis.raid_disks = atoi(w+6);
 493                 } else if (strncasecmp(w, "num-devices=", 12) == 0 ) {
 494                         /* again, for compat */
 495                         mis.raid_disks = atoi(w+12);
 496                 } else if (strncasecmp(w, "spares=", 7) == 0 ) {
 497                         /* for warning if not all spares present */
 498                         mis.spare_disks = atoi(w+7);
 499                 } else if (strncasecmp(w, "metadata=", 9) == 0) {
 500                         /* style of metadata on the devices. */
 501                         int i;
 502
 503                         for(i=0; superlist[i] && !mis.st; i++)
 504                                 mis.st = superlist[i]->match_metadata_desc(w+9);
 505
 506                         if (!mis.st)
 507                                 pr_err("metadata format %s unknown, ignored.\n", w+9);
 508                 } else if (strncasecmp(w, "auto=", 5) == 0 ) {
 509                         /* whether to create device special files as needed */
 510                         mis.autof = parse_auto(w+5, "auto type", 0);
 511                 } else if (strncasecmp(w, "member=", 7) == 0) {
 512                         /* subarray within a container */
 513                         mis.member = xstrdup(w+7);
 514                 } else if (strncasecmp(w, "container=", 10) == 0) {
 515                         /* the container holding this subarray.  Either a device name
 516                          * or a uuid */
 517                         mis.container = xstrdup(w+10);
 518                 } else {
 519                         pr_err("unrecognised word on ARRAY line: %s\n",
 520                                 w);
 521                 }
 522         }
 523         if (mis.uuid_set == 0 && mis.devices == NULL &&
 524             mis.super_minor == UnSet && mis.name[0] == 0 &&
 525             (mis.container == NULL || mis.member == NULL))
 526                 pr_err("ARRAY line %s has no identity information.\n", mis.devname);
 527         else {
 528                 mi = xmalloc(sizeof(*mi));
 529                 *mi = mis;
 530                 mi->devname = mis.devname ? xstrdup(mis.devname) : NULL;
 531                 mi->next = NULL;
 532                 *mddevlp = mi;
 533                 mddevlp = &mi->next;
 534         }
 535 }
 536
 537 static char *alert_email = NULL;
 538 void mailline(char *line)
 539 {
 540         char *w;
 541
 542         for (w=dl_next(line); w != line ; w=dl_next(w)) {
 543                 if (alert_email == NULL)
 544                         alert_email = xstrdup(w);
 545                 else
 546                         pr_err("excess address on MAIL line: %s - ignored\n",
 547                                 w);
 548         }
 549 }
 550
 551 static char *alert_mail_from = NULL;
 552 void mailfromline(char *line)
 553 {
 554         char *w;
 555
 556         for (w=dl_next(line); w != line ; w=dl_next(w)) {
 557                 if (alert_mail_from == NULL)
 558                         alert_mail_from = xstrdup(w);
 559                 else {
 560                         char *t = NULL;
 561
 562                         if (xasprintf(&t, "%s %s", alert_mail_from, w) > 0) {
 563                                 free(alert_mail_from);
 564                                 alert_mail_from = t;
 565                         }
 566                 }
 567         }
 568 }
 569
 570 static char *alert_program = NULL;
 571 void programline(char *line)
 572 {
 573         char *w;
 574
 575         for (w=dl_next(line); w != line ; w=dl_next(w)) {
 576                 if (alert_program == NULL)
 577                         alert_program = xstrdup(w);
 578                 else
 579                         pr_err("excess program on PROGRAM line: %s - ignored\n",
 580                                 w);
 581         }
 582 }
 583
 584 static char *home_host = NULL;
 585 static int require_homehost = 1;
 586 void homehostline(char *line)
 587 {
 588         char *w;
 589
 590         for (w=dl_next(line); w != line ; w=dl_next(w)) {
 591                 if (strcasecmp(w, "<ignore>")==0)
 592                         require_homehost = 0;
 593                 else if (home_host == NULL) {
 594                         if (strcasecmp(w, "<none>")==0)
 595                                 home_host = xstrdup("");
 596                         else
 597                                 home_host = xstrdup(w);
 598                 }else
 599                         pr_err("excess host name on HOMEHOST line: %s - ignored\n",
 600                                 w);
 601         }
 602 }
 603
 604 char auto_yes[] = "yes";
 605 char auto_no[] = "no";
 606 char auto_homehost[] = "homehost";
 607
 608 static int auto_seen = 0;
 609 void autoline(char *line)
 610 {
 611         char *w;
 612         char *seen;
 613         int super_cnt;
 614         char *dflt = auto_yes;
 615         int homehost = 0;
 616         int i;
 617
 618         if (auto_seen) {
 619                 pr_err("AUTO line may only be give once."
 620                         "  Subsequent lines ignored\n");
 621                 return;
 622         }
 623         /* Parse the 'auto' line creating policy statements for the 'auto' policy.
 624          *
 625          * The default is 'yes' but the 'auto' line might over-ride that.
 626          * Words in the line are processed in order with the first
 627          * match winning.
 628          * word can be:
 629          *   +version   - that version can be assembled
 630          *   -version   - that version cannot be auto-assembled
 631          *   yes or +all - any other version can be assembled
 632          *   no or -all  - no other version can be assembled.
 633          *   homehost   - any array associated by 'homehost' to this
 634          *                host can be assembled.
 635          *
 636          * Thus:
 637          *   +ddf -0.90 homehost -all
 638          * will auto-assemble any ddf array, no 0.90 array, and
 639          * any other array (imsm, 1.x) if and only if it is identified
 640          * as belonging to this host.
 641          *
 642          * We translate that to policy by creating 'auto=yes' when we see
 643          * a '+version' line, 'auto=no' if we see '-version' before 'homehost',
 644          * or 'auto=homehost' if we see '-version' after 'homehost'.
 645          * When we see yes, no, +all or -all we stop and any version that hasn't
 646          * been seen gets an appropriate auto= entry.
 647          */
 648
 649         for (super_cnt = 0; superlist[super_cnt]; super_cnt++)
 650                 ;
 651         seen = xcalloc(super_cnt, 1);
 652
 653         for (w = dl_next(line); w != line ; w = dl_next(w)) {
 654                 char *val;
 655
 656                 if (strcasecmp(w, "yes") == 0) {
 657                         dflt = auto_yes;
 658                         break;
 659                 }
 660                 if (strcasecmp(w, "no") == 0) {
 661                         if (homehost)
 662                                 dflt = auto_homehost;
 663                         else
 664                                 dflt = auto_no;
 665                         break;
 666                 }
 667                 if (strcasecmp(w, "homehost") == 0) {
 668                         homehost = 1;
 669                         continue;
 670                 }
 671                 if (w[0] == '+')
 672                         val = auto_yes;
 673                 else if (w[0] == '-') {
 674                         if (homehost)
 675                                 val = auto_homehost;
 676                         else
 677                                 val = auto_no;
 678                 } else
 679                         continue;
 680
 681                 if (strcasecmp(w+1, "all") == 0) {
 682                         dflt = val;
 683                         break;
 684                 }
 685                 for (i = 0; superlist[i]; i++) {
 686                         const char *version = superlist[i]->name;
 687                         if (strcasecmp(w+1, version) == 0)
 688                                 break;
 689                         /* 1 matches 1.x, 0 matches 0.90 */
 690                         if (version[1] == '.' &&
 691                             strlen(w+1) == 1 &&
 692                             w[1] == version[0])
 693                                 break;
 694                         /* 1.anything matches 1.x */
 695                         if (strcmp(version, "1.x") == 0 &&
 696                             strncmp(w+1, "1.", 2) == 0)
 697                                 break;
 698                 }
 699                 if (superlist[i] == NULL)
 700                         /* ignore this word */
 701                         continue;
 702                 if (seen[i])
 703                         /* already know about this metadata */
 704                         continue;
 705                 policy_add(rule_policy, pol_auto, val, pol_metadata, superlist[i]->name, NULL);
 706                 seen[i] = 1;
 707         }
 708         for (i = 0; i < super_cnt; i++)
 709                 if (!seen[i])
 710                         policy_add(rule_policy, pol_auto, dflt, pol_metadata, superlist[i]->name, NULL);
 711
 712         free(seen);
 713 }
 714
 715 int loaded = 0;
 716
 717 static char *conffile = NULL;
 718 void set_conffile(char *file)
 719 {
 720         conffile = file;
 721 }
 722
 723 void load_conffile(void)
 724 {
 725         FILE *f;
 726         char *line;
 727
 728         if (loaded) return;
 729         if (conffile == NULL)
 730                 conffile = DefaultConfFile;
 731
 732         if (strcmp(conffile, "none") == 0) {
 733                 loaded = 1;
 734                 return;
 735         }
 736         if (strcmp(conffile, "partitions")==0) {
 737                 char *list = dl_strdup("DEV");
 738                 dl_init(list);
 739                 dl_add(list, dl_strdup("partitions"));
 740                 devline(list);
 741                 free_line(list);
 742                 loaded = 1;
 743                 return;
 744         }
 745         f = fopen(conffile, "r");
 746         /* Debian chose to relocate mdadm.conf into /etc/mdadm/.
 747          * To allow Debian users to compile from clean source and still
 748          * have a working mdadm, we read /etc/mdadm/mdadm.conf
 749          * if /etc/mdadm.conf doesn't exist
 750          */
 751         if (f == NULL &&
 752             conffile == DefaultConfFile) {
 753                 f = fopen(DefaultAltConfFile, "r");
 754                 if (f)
 755                         conffile = DefaultAltConfFile;
 756         }
 757         if (f == NULL)
 758                 return;
 759
 760         loaded = 1;
 761         while ((line=conf_line(f))) {
 762                 switch(match_keyword(line)) {
 763                 case Devices:
 764                         devline(line);
 765                         break;
 766                 case Array:
 767                         arrayline(line);
 768                         break;
 769                 case Mailaddr:
 770                         mailline(line);
 771                         break;
 772                 case Mailfrom:
 773                         mailfromline(line);
 774                         break;
 775                 case Program:
 776                         programline(line);
 777                         break;
 778                 case CreateDev:
 779                         createline(line);
 780                         break;
 781                 case Homehost:
 782                         homehostline(line);
 783                         break;
 784                 case AutoMode:
 785                         autoline(line);
 786                         break;
 787                 case Policy:
 788                         policyline(line, rule_policy);
 789                         break;
 790                 case PartPolicy:
 791                         policyline(line, rule_part);
 792                         break;
 793                 default:
 794                         pr_err("Unknown keyword %s\n", line);
 795                 }
 796                 free_line(line);
 797         }
 798
 799         fclose(f);
 800
 801 /*    printf("got file\n"); */
 802 }
 803
 804 char *conf_get_mailaddr(void)
 805 {
 806         load_conffile();
 807         return alert_email;
 808 }
 809
 810 char *conf_get_mailfrom(void)
 811 {
 812         load_conffile();
 813         return alert_mail_from;
 814 }
 815
 816 char *conf_get_program(void)
 817 {
 818         load_conffile();
 819         return alert_program;
 820 }
 821
 822 char *conf_get_homehost(int *require_homehostp)
 823 {
 824         load_conffile();
 825         if (require_homehostp)
 826                 *require_homehostp = require_homehost;
 827         return home_host;
 828 }
 829
 830 struct createinfo *conf_get_create_info(void)
 831 {
 832         load_conffile();
 833         return &createinfo;
 834 }
 835
 836 struct mddev_ident *conf_get_ident(char *dev)
 837 {
 838         struct mddev_ident *rv;
 839         load_conffile();
 840         rv = mddevlist;
 841         while (dev && rv && (rv->devname == NULL
 842                              || !devname_matches(dev, rv->devname)))
 843                 rv = rv->next;
 844         return rv;
 845 }
 846
 847 static void append_dlist(struct mddev_dev **dlp, struct mddev_dev *list)
 848 {
 849         while (*dlp)
 850                 dlp = &(*dlp)->next;
 851         *dlp = list;
 852 }
 853
 854 struct mddev_dev *conf_get_devs()
 855 {
 856         glob_t globbuf;
 857         struct conf_dev *cd;
 858         int flags = 0;
 859         static struct mddev_dev *dlist = NULL;
 860         unsigned int i;
 861
 862         while (dlist) {
 863                 struct mddev_dev *t = dlist;
 864                 dlist = dlist->next;
 865                 free(t->devname);
 866                 free(t);
 867         }
 868
 869         load_conffile();
 870
 871         if (cdevlist == NULL) {
 872                 /* default to 'partitions' and 'containers' */
 873                 dlist = load_partitions();
 874                 append_dlist(&dlist, load_containers());
 875         }
 876
 877         for (cd=cdevlist; cd; cd=cd->next) {
 878                 if (strcasecmp(cd->name, "partitions")==0)
 879                         append_dlist(&dlist, load_partitions());
 880                 else if (strcasecmp(cd->name, "containers")==0)
 881                         append_dlist(&dlist, load_containers());
 882                 else {
 883                         glob(cd->name, flags, NULL, &globbuf);
 884                         flags |= GLOB_APPEND;
 885                 }
 886         }
 887         if (flags & GLOB_APPEND) {
 888                 for (i=0; i<globbuf.gl_pathc; i++) {
 889                         struct mddev_dev *t = xmalloc(sizeof(*t));
 890                         memset(t, 0, sizeof(*t));
 891                         t->devname = xstrdup(globbuf.gl_pathv[i]);
 892                         t->next = dlist;
 893                         dlist = t;
 894 /*      printf("one dev is %s\n", t->devname);*/
 895                 }
 896                 globfree(&globbuf);
 897         }
 898
 899         return dlist;
 900 }
 901
 902 int conf_test_dev(char *devname)
 903 {
 904         struct conf_dev *cd;
 905         if (cdevlist == NULL)
 906                 /* allow anything by default */
 907                 return 1;
 908         for (cd = cdevlist ; cd ; cd = cd->next) {
 909                 if (strcasecmp(cd->name, "partitions") == 0)
 910                         return 1;
 911                 if (fnmatch(cd->name, devname, FNM_PATHNAME) == 0)
 912                         return 1;
 913         }
 914         return 0;
 915 }
 916
 917 int conf_test_metadata(const char *version, struct dev_policy *pol, int is_homehost)
 918 {
 919         /* If anyone said 'yes', that sticks.
 920          * else if homehost applies, use that
 921          * else if there is a 'no', say 'no'.
 922          * else 'yes'.
 923          */
 924         struct dev_policy *p;
 925         int no=0, found_homehost=0;
 926         load_conffile();
 927
 928         pol = pol_find(pol, pol_auto);
 929         pol_for_each(p, pol, version) {
 930                 if (strcmp(p->value, "yes") == 0)
 931                         return 1;
 932                 if (strcmp(p->value, "homehost") == 0)
 933                         found_homehost = 1;
 934                 if (strcmp(p->value, "no") == 0)
 935                         no = 1;
 936         }
 937         if (is_homehost && found_homehost)
 938                 return 1;
 939         if (no)
 940                 return 0;
 941         return 1;
 942 }
 943
 944 int match_oneof(char *devices, char *devname)
 945 {
 946         /* check if one of the comma separated patterns in devices
 947          * matches devname
 948          */
 949
 950         while (devices && *devices) {
 951                 char patn[1024];
 952                 char *p = devices;
 953                 devices = strchr(devices, ',');
 954                 if (!devices)
 955                         devices = p + strlen(p);
 956                 if (devices-p < 1024) {
 957                         strncpy(patn, p, devices-p);
 958                         patn[devices-p] = 0;
 959                         if (fnmatch(patn, devname, FNM_PATHNAME)==0)
 960                                 return 1;
 961                 }
 962                 if (*devices == ',')
 963                         devices++;
 964         }
 965         return 0;
 966 }
 967
 968 int devname_matches(char *name, char *match)
 969 {
 970         /* See if the given array name matches the
 971          * given match from config file.
 972          *
 973          * First strip and /dev/md/ or /dev/, then
 974          * see if there might be a numeric match of
 975          *  mdNN with NN
 976          * then just strcmp
 977          */
 978         if (strncmp(name, "/dev/md/", 8) == 0)
 979                 name += 8;
 980         else if (strncmp(name, "/dev/", 5) == 0)
 981                 name += 5;
 982
 983         if (strncmp(match, "/dev/md/", 8) == 0)
 984                 match += 8;
 985         else if (strncmp(match, "/dev/", 5) == 0)
 986                 match += 5;
 987
 988         if (strncmp(name, "md", 2) == 0 &&
 989             isdigit(name[2]))
 990                 name += 2;
 991         if (strncmp(match, "md", 2) == 0 &&
 992             isdigit(match[2]))
 993                 match += 2;
 994
 995         return (strcmp(name, match) == 0);
 996 }
 997
 998 int conf_name_is_free(char *name)
 999 {
1000         /* Check if this name is already taken by an ARRAY entry in
1001          * the config file.
1002          * It can be taken either by a match on devname, name, or
1003          * even super-minor.
1004          */
1005         struct mddev_ident *dev;
1006
1007         load_conffile();
1008         for (dev = mddevlist; dev; dev = dev->next) {
1009                 char nbuf[100];
1010                 if (dev->devname && devname_matches(name, dev->devname))
1011                         return 0;
1012                 if (dev->name[0] && devname_matches(name, dev->name))
1013                         return 0;
1014                 sprintf(nbuf, "%d", dev->super_minor);
1015                 if (dev->super_minor != UnSet &&
1016                     devname_matches(name, nbuf))
1017                         return 0;
1018         }
1019         return 1;
1020 }
1021
1022 struct mddev_ident *conf_match(struct supertype *st,
1023                                struct mdinfo *info,
1024                                char *devname,
1025                                int verbose, int *rvp)
1026 {
1027         struct mddev_ident *array_list, *match;
1028         array_list = conf_get_ident(NULL);
1029         match = NULL;
1030         for (; array_list; array_list = array_list->next) {
1031                 if (array_list->uuid_set &&
1032                     same_uuid(array_list->uuid, info->uuid, st->ss->swapuuid)
1033                     == 0) {
1034                         if (verbose >= 2 && array_list->devname)
1035                                 pr_err("UUID differs from %s.\n",
1036                                        array_list->devname);
1037                         continue;
1038                 }
1039                 if (array_list->name[0] &&
1040                     strcasecmp(array_list->name, info->name) != 0) {
1041                         if (verbose >= 2 && array_list->devname)
1042                                 pr_err("Name differs from %s.\n",
1043                                        array_list->devname);
1044                         continue;
1045                 }
1046                 if (array_list->devices && devname &&
1047                     !match_oneof(array_list->devices, devname)) {
1048                         if (verbose >= 2 && array_list->devname)
1049                                 pr_err("Not a listed device for %s.\n",
1050                                        array_list->devname);
1051                         continue;
1052                 }
1053                 if (array_list->super_minor != UnSet &&
1054                     array_list->super_minor != info->array.md_minor) {
1055                         if (verbose >= 2 && array_list->devname)
1056                                 pr_err("Different super-minor to %s.\n",
1057                                        array_list->devname);
1058                         continue;
1059                 }
1060                 if (!array_list->uuid_set &&
1061                     !array_list->name[0] &&
1062                     !array_list->devices &&
1063                     array_list->super_minor == UnSet) {
1064                         if (verbose >= 2 && array_list->devname)
1065                                 pr_err("%s doesn't have any identifying"
1066                                        " information.\n",
1067                                        array_list->devname);
1068                         continue;
1069                 }
1070                 /* FIXME, should I check raid_disks and level too?? */
1071
1072                 if (match) {
1073                         if (verbose >= 0) {
1074                                 if (match->devname && array_list->devname)
1075                                         pr_err("we match both %s and %s - "
1076                                                "cannot decide which to use.\n",
1077                                                match->devname,
1078                                                array_list->devname);
1079                                 else
1080                                         pr_err("multiple lines in mdadm.conf"
1081                                                " match\n");
1082                         }
1083                         if (rvp)
1084                                 *rvp = 2;
1085                         match = NULL;
1086                         break;
1087                 }
1088                 match = array_list;
1089         }
1090         return match;
1091 }
1092
1093 int conf_verify_devnames(struct mddev_ident *array_list)
1094 {
1095         struct mddev_ident *a1, *a2;
1096
1097         for (a1 = array_list; a1; a1 = a1->next) {
1098                 if (!a1->devname)
1099                         continue;
1100                 if (strcmp(a1->devname, "<ignore>") == 0)
1101                         continue;
1102                 for (a2 = a1->next; a2; a2 = a2->next) {
1103                         if (!a2->devname)
1104                                 continue;
1105                         if (strcmp(a1->devname, a2->devname) != 0)
1106                                 continue;
1107
1108                         if (a1->uuid_set && a2->uuid_set) {
1109                                 char nbuf[64];
1110                                 __fname_from_uuid(a1->uuid, 0, nbuf, ':');
1111                                 pr_err("Devices %s and ",
1112                                        nbuf);
1113                                 __fname_from_uuid(a2->uuid, 0, nbuf, ':');
1114                                 fprintf(stderr,
1115                                         "%s have the same name: %s\n",
1116                                         nbuf, a1->devname);
1117                         } else
1118                                 pr_err("Device %s given twice"
1119                                         " in config file\n", a1->devname);
1120                         return 1;
1121                 }
1122         }
1123
1124         return 0;
1125 }