misc/fsck.c

   1 /*
   2  * pfsck --- A generic, parallelizing front-end for the fsck program.
   3  * It will automatically try to run fsck programs in parallel if the
   4  * devices are on separate spindles.  It is based on the same ideas as
   5  * the generic front end for fsck by David Engel and Fred van Kempen,
   6  * but it has been completely rewritten from scratch to support
   7  * parallel execution.
   8  *
   9  * Written by Theodore Ts'o, <tytso@mit.edu>
  10  *
  11  * Usage:       fsck [-ACVRNTM] [-s] [-t fstype] [fs-options] device
  12  *
  13  * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
  14  *   o Changed -t fstype to behave like with mount when -A (all file
  15  *     systems) or -M (like mount) is specified.
  16  *   o fsck looks if it can find the fsck.type program to decide
  17  *     if it should ignore the fs type. This way more fsck programs
  18  *     can be added without changing this front-end.
  19  *   o -R flag skip root file system.
  20  *
  21  * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
  22  *
  23  * %Begin-Header%
  24  * This file may be redistributed under the terms of the GNU Public
  25  * License.
  26  * %End-Header%
  27  */
  28
  29 #include <sys/types.h>
  30 #include <sys/wait.h>
  31 #include <sys/signal.h>
  32 #include <sys/stat.h>
  33 #include <limits.h>
  34 #include <stdio.h>
  35 #include <ctype.h>
  36 #include <string.h>
  37 #include <time.h>
  38 #if HAVE_STDLIB_H
  39 #include <stdlib.h>
  40 #endif
  41 #if HAVE_ERRNO_H
  42 #include <errno.h>
  43 #endif
  44 #if HAVE_PATHS_H
  45 #include <paths.h>
  46 #endif
  47 #if HAVE_UNISTD_H
  48 #include <unistd.h>
  49 #endif
  50 #if HAVE_ERRNO_H
  51 #include <errno.h>
  52 #endif
  53 #include <malloc.h>
  54
  55 #include "../version.h"
  56 #include "nls-enable.h"
  57 #include "fsck.h"
  58 #include "blkid/blkid.h"
  59
  60 #ifndef _PATH_MNTTAB
  61 #define _PATH_MNTTAB    "/etc/fstab"
  62 #endif
  63
  64 static const char *ignored_types[] = {
  65         "ignore",
  66         "iso9660",
  67         "nfs",
  68         "proc",
  69         "sw",
  70         "swap",
  71         NULL
  72 };
  73
  74 static const char *really_wanted[] = {
  75         "minix",
  76         "ext2",
  77         "ext3",
  78         "xiafs",
  79         NULL
  80 };
  81
  82 #define BASE_MD "/dev/md"
  83
  84 /*
  85  * Global variables for options
  86  */
  87 char *devices[MAX_DEVICES];
  88 char *args[MAX_ARGS];
  89 int num_devices, num_args;
  90
  91 int verbose = 0;
  92 int doall = 0;
  93 int noexecute = 0;
  94 int serialize = 0;
  95 int skip_root = 0;
  96 int like_mount = 0;
  97 int notitle = 0;
  98 int parallel_root = 0;
  99 int progress = 0;
 100 int force_all_parallel = 0;
 101 int num_running = 0;
 102 int max_running = 0;
 103 volatile int cancel_requested = 0;
 104 int kill_sent = 0;
 105 char *progname;
 106 char *fstype = NULL;
 107 struct fs_info *filesys_info = NULL, *filesys_last = NULL;
 108 struct fsck_instance *instance_list;
 109 const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
 110 char *fsck_path = 0;
 111 blkid_cache cache = NULL;
 112
 113 static char *string_copy(const char *s)
 114 {
 115         char    *ret;
 116
 117         if (!s)
 118                 return 0;
 119         ret = malloc(strlen(s)+1);
 120         if (ret)
 121                 strcpy(ret, s);
 122         return ret;
 123 }
 124
 125 static int ignore(struct fs_info *);
 126
 127 static char *skip_over_blank(char *cp)
 128 {
 129         while (*cp && isspace(*cp))
 130                 cp++;
 131         return cp;
 132 }
 133
 134 static char *skip_over_word(char *cp)
 135 {
 136         while (*cp && !isspace(*cp))
 137                 cp++;
 138         return cp;
 139 }
 140
 141 static void strip_line(char *line)
 142 {
 143         char    *p;
 144
 145         while (*line) {
 146                 p = line + strlen(line) - 1;
 147                 if ((*p == '\n') || (*p == '\r'))
 148                         *p = 0;
 149                 else
 150                         break;
 151         }
 152 }
 153
 154 static char *parse_word(char **buf)
 155 {
 156         char *word, *next;
 157
 158         word = *buf;
 159         if (*word == 0)
 160                 return 0;
 161
 162         word = skip_over_blank(word);
 163         next = skip_over_word(word);
 164         if (*next)
 165                 *next++ = 0;
 166         *buf = next;
 167         return word;
 168 }
 169
 170 static void parse_escape(char *word)
 171 {
 172         char    *p, *q;
 173         int     ac, i;
 174
 175         if (!word)
 176                 return;
 177
 178         for (p = word, q = word; *p; p++, q++) {
 179                 *q = *p;
 180                 if (*p != '\\')
 181                         continue;
 182                 if (*++p == 0)
 183                         break;
 184                 if (*p == 't') {
 185                         *q = '\t';
 186                         continue;
 187                 }
 188                 if (*p == 'n') {
 189                         *q = '\n';
 190                         continue;
 191                 }
 192                 if (!isdigit(*p)) {
 193                         *q = *p;
 194                         continue;
 195                 }
 196                 ac = 0;
 197                 for (i = 0; i < 3; i++, p++) {
 198                         if (!isdigit(*p))
 199                                 break;
 200                         ac = (ac * 8) + (*p - '0');
 201                 }
 202                 *q = ac;
 203                 p--;
 204         }
 205         *q = 0;
 206 }
 207
 208 static void free_instance(struct fsck_instance *i)
 209 {
 210         if (i->prog)
 211                 free(i->prog);
 212         if (i->device)
 213                 free(i->device);
 214         if (i->base_device)
 215                 free(i->base_device);
 216         free(i);
 217         return;
 218 }
 219
 220 static struct fs_info *create_fs_device(char *device, char *mntpnt,
 221                                         char *type, char *opts, int freq,
 222                                         int passno)
 223 {
 224         struct fs_info *fs;
 225
 226         if (!(fs = malloc(sizeof(struct fs_info))))
 227                 return NULL;
 228
 229         fs->device = string_copy(device);
 230         fs->mountpt = string_copy(mntpnt);
 231         fs->type = string_copy(type);
 232         fs->opts = string_copy(opts ? opts : "");
 233         fs->freq = freq;
 234         fs->passno = passno;
 235         fs->flags = 0;
 236         fs->next = NULL;
 237
 238         if (!filesys_info)
 239                 filesys_info = fs;
 240         else
 241                 filesys_last->next = fs;
 242         filesys_last = fs;
 243
 244         return fs;
 245 }
 246
 247
 248
 249 static int parse_fstab_line(char *line, struct fs_info **ret_fs)
 250 {
 251         char    *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
 252         char    *t = NULL;
 253         struct fs_info *fs;
 254
 255         *ret_fs = 0;
 256         strip_line(line);
 257         if ((cp = strchr(line, '#')))
 258                 *cp = 0;        /* Ignore everything after the comment char */
 259         cp = line;
 260
 261         device = parse_word(&cp);
 262         mntpnt = parse_word(&cp);
 263         type = parse_word(&cp);
 264         opts = parse_word(&cp);
 265         freq = parse_word(&cp);
 266         passno = parse_word(&cp);
 267
 268         if (!device)
 269                 return 0;       /* Allow blank lines */
 270
 271         if (!mntpnt || !type)
 272                 return -1;
 273
 274         parse_escape(device);
 275         parse_escape(mntpnt);
 276         parse_escape(type);
 277         parse_escape(opts);
 278         parse_escape(freq);
 279         parse_escape(passno);
 280
 281         dev = blkid_get_devname(cache, device, NULL);
 282         if (dev)
 283                 device = dev;
 284
 285         if (strcmp(type, "auto") == 0 || (strchr(type, ',') != 0))
 286                 t = blkid_get_tag_value(cache, "TYPE", device);
 287         if (t)
 288                 type = t;
 289
 290         fs = create_fs_device(device, mntpnt, type, opts,
 291                               freq ? atoi(freq) : -1,
 292                               passno ? atoi(passno) : -1);
 293         if (dev)
 294                 free(dev);
 295         if (t)
 296                 free(t);
 297
 298         if (!fs)
 299                 return -1;
 300         *ret_fs = fs;
 301         return 0;
 302 }
 303
 304 /*
 305  * Load the filesystem database from /etc/fstab
 306  */
 307 static void load_fs_info(const char *filename)
 308 {
 309         FILE    *f;
 310         char    buf[1024];
 311         int     lineno = 0;
 312         int     old_fstab = 1;
 313         struct fs_info *fs;
 314
 315         if ((f = fopen(filename, "r")) == NULL) {
 316                 fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
 317                         filename, strerror(errno));
 318                 return;
 319         }
 320         while (!feof(f)) {
 321                 lineno++;
 322                 if (!fgets(buf, sizeof(buf), f))
 323                         break;
 324                 buf[sizeof(buf)-1] = 0;
 325                 if (parse_fstab_line(buf, &fs) < 0) {
 326                         fprintf(stderr, _("WARNING: bad format "
 327                                 "on line %d of %s\n"), lineno, filename);
 328                         continue;
 329                 }
 330                 if (!fs)
 331                         continue;
 332                 if (fs->passno < 0)
 333                         fs->passno = 0;
 334                 else
 335                         old_fstab = 0;
 336         }
 337
 338         fclose(f);
 339
 340         if (old_fstab) {
 341                 fprintf(stderr, _("\007\007\007"
 342                 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
 343                 "       field.  I will kludge around things for you, but you\n"
 344                 "       should fix your /etc/fstab file as soon as you can.\n\n"));
 345
 346                 for (fs = filesys_info; fs; fs = fs->next) {
 347                         fs->passno = 1;
 348                 }
 349         }
 350 }
 351
 352 /* Lookup filesys in /etc/fstab and return the corresponding entry. */
 353 static struct fs_info *lookup(char *filesys)
 354 {
 355         struct fs_info *fs;
 356         int     try_again = 0;
 357
 358         /* No filesys name given. */
 359         if (filesys == NULL)
 360                 return NULL;
 361
 362         for (fs = filesys_info; fs; fs = fs->next) {
 363                 if (!strcmp(filesys, fs->device) ||
 364                     (fs->mountpt && !strcmp(filesys, fs->mountpt)))
 365                         break;
 366         }
 367
 368         return fs;
 369 }
 370
 371 /* Find fsck program for a given fs type. */
 372 static char *find_fsck(char *type)
 373 {
 374   char *s;
 375   const char *tpl;
 376   static char prog[256];
 377   char *p = string_copy(fsck_path);
 378   struct stat st;
 379
 380   /* Are we looking for a program or just a type? */
 381   tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
 382
 383   for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
 384         sprintf(prog, tpl, s, type);
 385         if (stat(prog, &st) == 0) break;
 386   }
 387   free(p);
 388   return(s ? prog : NULL);
 389 }
 390
 391 static int progress_active(NOARGS)
 392 {
 393         struct fsck_instance *inst;
 394
 395         for (inst = instance_list; inst; inst = inst->next) {
 396                 if (inst->flags & FLAG_DONE)
 397                         continue;
 398                 if (inst->flags & FLAG_PROGRESS)
 399                         return 1;
 400         }
 401         return 0;
 402 }
 403
 404 /*
 405  * Execute a particular fsck program, and link it into the list of
 406  * child processes we are waiting for.
 407  */
 408 static int execute(const char *type, const char *device, const char *mntpt,
 409                    int interactive)
 410 {
 411         char *s, *argv[80], prog[80];
 412         int  argc, i;
 413         struct fsck_instance *inst, *p;
 414         pid_t   pid;
 415
 416         inst = malloc(sizeof(struct fsck_instance));
 417         if (!inst)
 418                 return ENOMEM;
 419         memset(inst, 0, sizeof(struct fsck_instance));
 420
 421         sprintf(prog, "fsck.%s", type);
 422         argv[0] = string_copy(prog);
 423         argc = 1;
 424
 425         for (i=0; i <num_args; i++)
 426                 argv[argc++] = string_copy(args[i]);
 427
 428         if (progress & !progress_active()) {
 429                 if ((strcmp(type, "ext2") == 0) ||
 430                     (strcmp(type, "ext3") == 0)) {
 431                         argv[argc++] = string_copy("-C0");
 432                         inst->flags |= FLAG_PROGRESS;
 433                 }
 434         }
 435
 436         argv[argc++] = string_copy(device);
 437         argv[argc] = 0;
 438
 439         s = find_fsck(prog);
 440         if (s == NULL) {
 441                 fprintf(stderr, _("fsck: %s: not found\n"), prog);
 442                 return ENOENT;
 443         }
 444
 445         if (verbose || noexecute) {
 446                 printf("[%s (%d) -- %s] ", s, num_running,
 447                        mntpt ? mntpt : device);
 448                 for (i=0; i < argc; i++)
 449                         printf("%s ", argv[i]);
 450                 printf("\n");
 451         }
 452
 453         /* Fork and execute the correct program. */
 454         if (noexecute)
 455                 pid = -1;
 456         else if ((pid = fork()) < 0) {
 457                 perror("fork");
 458                 return errno;
 459         } else if (pid == 0) {
 460                 if (!interactive)
 461                         close(0);
 462                 (void) execv(s, argv);
 463                 perror(argv[0]);
 464                 exit(EXIT_ERROR);
 465         }
 466
 467         for (i=0; i < argc; i++)
 468                 free(argv[i]);
 469
 470         inst->pid = pid;
 471         inst->prog = string_copy(prog);
 472         inst->type = string_copy(type);
 473         inst->device = string_copy(device);
 474         inst->base_device = base_device(device);
 475         inst->start_time = time(0);
 476         inst->next = NULL;
 477
 478         /*
 479          * Find the end of the list, so we add the instance on at the end.
 480          */
 481         for (p = instance_list; p && p->next; p = p->next);
 482
 483         if (p)
 484                 p->next = inst;
 485         else
 486                 instance_list = inst;
 487
 488         return 0;
 489 }
 490
 491 /*
 492  * Send a signal to all outstanding fsck child processes
 493  */
 494 static int kill_all(int signum)
 495 {
 496         struct fsck_instance *inst;
 497         int     n = 0;
 498
 499         for (inst = instance_list; inst; inst = inst->next) {
 500                 if (inst->flags & FLAG_DONE)
 501                         continue;
 502                 kill(inst->pid, signum);
 503                 n++;
 504         }
 505         return n;
 506 }
 507
 508 /*
 509  * Wait for one child process to exit; when it does, unlink it from
 510  * the list of executing child processes, and return it.
 511  */
 512 static struct fsck_instance *wait_one(int flags)
 513 {
 514         int     status;
 515         int     sig;
 516         struct fsck_instance *inst, *inst2, *prev;
 517         pid_t   pid;
 518
 519         if (!instance_list)
 520                 return NULL;
 521
 522         if (noexecute) {
 523                 inst = instance_list;
 524                 prev = 0;
 525 #ifdef RANDOM_DEBUG
 526                 while (inst->next && (random() & 1)) {
 527                         prev = inst;
 528                         inst = inst->next;
 529                 }
 530 #endif
 531                 inst->exit_status = 0;
 532                 goto ret_inst;
 533         }
 534
 535         /*
 536          * gcc -Wall fails saving throw against stupidity
 537          * (inst and prev are thought to be uninitialized variables)
 538          */
 539         inst = prev = NULL;
 540
 541         do {
 542                 pid = waitpid(-1, &status, flags);
 543                 if (cancel_requested && !kill_sent) {
 544                         kill_all(SIGTERM);
 545                         kill_sent++;
 546                 }
 547                 if ((pid == 0) && (flags & WNOHANG))
 548                         return NULL;
 549                 if (pid < 0) {
 550                         if ((errno == EINTR) || (errno == EAGAIN))
 551                                 continue;
 552                         if (errno == ECHILD) {
 553                                 fprintf(stderr,
 554                                         _("%s: wait: No more child process?!?\n"),
 555                                         progname);
 556                                 return NULL;
 557                         }
 558                         perror("wait");
 559                         continue;
 560                 }
 561                 for (prev = 0, inst = instance_list;
 562                      inst;
 563                      prev = inst, inst = inst->next) {
 564                         if (inst->pid == pid)
 565                                 break;
 566                 }
 567         } while (!inst);
 568
 569         if (WIFEXITED(status))
 570                 status = WEXITSTATUS(status);
 571         else if (WIFSIGNALED(status)) {
 572                 sig = WTERMSIG(status);
 573                 if (sig == SIGINT) {
 574                         status = EXIT_UNCORRECTED;
 575                 } else {
 576                         printf(_("Warning... %s for device %s exited "
 577                                "with signal %d.\n"),
 578                                inst->prog, inst->device, sig);
 579                         status = EXIT_ERROR;
 580                 }
 581         } else {
 582                 printf(_("%s %s: status is %x, should never happen.\n"),
 583                        inst->prog, inst->device, status);
 584                 status = EXIT_ERROR;
 585         }
 586         inst->exit_status = status;
 587         if (progress && (inst->flags & FLAG_PROGRESS) &&
 588             !progress_active()) {
 589                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 590                         if (inst2->flags & FLAG_DONE)
 591                                 continue;
 592                         if (strcmp(inst2->type, "ext2") &&
 593                             strcmp(inst2->type, "ext3"))
 594                                 continue;
 595                         /*
 596                          * If we've just started the fsck, wait a tiny
 597                          * bit before sending the kill, to give it
 598                          * time to set up the signal handler
 599                          */
 600                         if (inst2->start_time < time(0)+2) {
 601                                 if (fork() == 0) {
 602                                         sleep(1);
 603                                         kill(inst2->pid, SIGUSR1);
 604                                         exit(0);
 605                                 }
 606                         } else
 607                                 kill(inst2->pid, SIGUSR1);
 608                         inst2->flags |= FLAG_PROGRESS;
 609                         break;
 610                 }
 611         }
 612 ret_inst:
 613         if (prev)
 614                 prev->next = inst->next;
 615         else
 616                 instance_list = inst->next;
 617         if (verbose > 1)
 618                 printf(_("Finished with %s (exit status %d)\n"),
 619                        inst->device, inst->exit_status);
 620         num_running--;
 621         return inst;
 622 }
 623
 624 /*
 625  * Wait until all executing child processes have exited; return the
 626  * logical OR of all of their exit code values.
 627  */
 628 static int wait_all(int flags)
 629 {
 630         struct fsck_instance *inst;
 631         int     global_status = 0;
 632
 633         while ((inst = wait_one(flags))) {
 634                 global_status |= inst->exit_status;
 635                 free_instance(inst);
 636 #ifdef RANDOM_DEBUG
 637                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 638                         break;
 639 #endif
 640         }
 641         return global_status;
 642 }
 643
 644 /*
 645  * Run the fsck program on a particular device
 646  *
 647  * If the type is specified using -t, and it isn't prefixed with "no"
 648  * (as in "noext2") and only one filesystem type is specified, then
 649  * use that type regardless of what is specified in /etc/fstab.
 650  *
 651  * If the type isn't specified by the user, then use either the type
 652  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 653  */
 654 static void fsck_device(struct fs_info *fs, int interactive)
 655 {
 656         const char *type = 0;
 657         int retval;
 658
 659         if (fstype && strncmp(fstype, "no", 2) &&
 660             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 661             !strchr(fstype, ','))
 662                 type = fstype;
 663
 664         type = fs->type ? fs->type : DEFAULT_FSTYPE;
 665
 666         num_running++;
 667         retval = execute(type, fs->device, fs->mountpt, interactive);
 668         if (retval) {
 669                 fprintf(stderr, _("%s: Error %d while executing fsck.%s "
 670                         "for %s\n"), progname, retval, type, fs->device);
 671                 num_running--;
 672         }
 673 }
 674
 675
 676 /*
 677  * Deal with the fsck -t argument.
 678  */
 679 struct fs_type_compile {
 680         char **list;
 681         int *type;
 682         int  negate;
 683 } fs_type_compiled;
 684
 685 #define FS_TYPE_NORMAL  0
 686 #define FS_TYPE_OPT     1
 687 #define FS_TYPE_NEGOPT  2
 688
 689 static const char *fs_type_syntax_error =
 690 N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
 691    "with 'no' or '!'.\n");
 692
 693 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 694 {
 695         char    *cp, *list, *s;
 696         int     num = 2;
 697         int     negate, first_negate = 1;
 698
 699         if (fs_type) {
 700                 for (cp=fs_type; *cp; cp++) {
 701                         if (*cp == ',')
 702                                 num++;
 703                 }
 704         }
 705
 706         cmp->list = malloc(num * sizeof(char *));
 707         cmp->type = malloc(num * sizeof(int));
 708         if (!cmp->list || !cmp->type) {
 709                 fprintf(stderr, _("Couldn't allocate memory for "
 710                                   "filesystem types\n"));
 711                 exit(EXIT_ERROR);
 712         }
 713         memset(cmp->list, 0, num * sizeof(char *));
 714         memset(cmp->type, 0, num * sizeof(int));
 715         cmp->negate = 0;
 716
 717         if (!fs_type)
 718                 return;
 719
 720         list = string_copy(fs_type);
 721         num = 0;
 722         s = strtok(list, ",");
 723         while(s) {
 724                 negate = 0;
 725                 if (strncmp(s, "no", 2) == 0) {
 726                         s += 2;
 727                         negate = 1;
 728                 } else if (*s == '!') {
 729                         s++;
 730                         negate = 1;
 731                 }
 732                 if (strcmp(s, "loop") == 0)
 733                         /* loop is really short-hand for opts=loop */
 734                         goto loop_special_case;
 735                 else if (strncmp(s, "opts=", 5) == 0) {
 736                         s += 5;
 737                 loop_special_case:
 738                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 739                 } else {
 740                         if (first_negate) {
 741                                 cmp->negate = negate;
 742                                 first_negate = 0;
 743                         }
 744                         if ((negate && !cmp->negate) ||
 745                             (!negate && cmp->negate)) {
 746                                 fprintf(stderr, _(fs_type_syntax_error));
 747                                 exit(EXIT_USAGE);
 748                         }
 749                 }
 750 #if 0
 751                 printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
 752 #endif
 753                 cmp->list[num++] = string_copy(s);
 754                 s = strtok(NULL, ",");
 755         }
 756         free(list);
 757 }
 758
 759 /*
 760  * This function returns true if a particular option appears in a
 761  * comma-delimited options list
 762  */
 763 static int opt_in_list(char *opt, char *optlist)
 764 {
 765         char    *list, *s;
 766
 767         if (!optlist)
 768                 return 0;
 769         list = string_copy(optlist);
 770
 771         s = strtok(list, ",");
 772         while(s) {
 773                 if (strcmp(s, opt) == 0) {
 774                         free(list);
 775                         return 1;
 776                 }
 777                 s = strtok(NULL, ",");
 778         }
 779         free(list);
 780         return 0;
 781 }
 782
 783 /* See if the filesystem matches the criteria given by the -t option */
 784 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 785 {
 786         int n, ret = 0, checked_type = 0;
 787         char *cp;
 788
 789         if (cmp->list == 0 || cmp->list[0] == 0)
 790                 return 1;
 791
 792         for (n=0; (cp = cmp->list[n]); n++) {
 793                 switch (cmp->type[n]) {
 794                 case FS_TYPE_NORMAL:
 795                         checked_type++;
 796                         if (strcmp(cp, fs->type) == 0) {
 797                                 ret = 1;
 798                         }
 799                         break;
 800                 case FS_TYPE_NEGOPT:
 801                         if (opt_in_list(cp, fs->opts))
 802                                 return 0;
 803                         break;
 804                 case FS_TYPE_OPT:
 805                         if (!opt_in_list(cp, fs->opts))
 806                                 return 0;
 807                         break;
 808                 }
 809         }
 810         if (checked_type == 0)
 811                 return 1;
 812         return (cmp->negate ? !ret : ret);
 813 }
 814
 815 /* Check if we should ignore this filesystem. */
 816 static int ignore(struct fs_info *fs)
 817 {
 818         const char **ip;
 819         int wanted = 0;
 820
 821         /*
 822          * If the pass number is 0, ignore it.
 823          */
 824         if (fs->passno == 0)
 825                 return 1;
 826
 827         /*
 828          * If a specific fstype is specified, and it doesn't match,
 829          * ignore it.
 830          */
 831         if (!fs_match(fs, &fs_type_compiled)) return 1;
 832
 833         /* Are we ignoring this type? */
 834         for(ip = ignored_types; *ip; ip++)
 835                 if (strcmp(fs->type, *ip) == 0) return 1;
 836
 837         /* Do we really really want to check this fs? */
 838         for(ip = really_wanted; *ip; ip++)
 839                 if (strcmp(fs->type, *ip) == 0) {
 840                         wanted = 1;
 841                         break;
 842                 }
 843
 844         /* See if the <fsck.fs> program is available. */
 845         if (find_fsck(fs->type) == NULL) {
 846                 if (wanted)
 847                         fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
 848                                 fs->device, fs->type);
 849                 return 1;
 850         }
 851
 852         /* We can and want to check this file system type. */
 853         return 0;
 854 }
 855
 856 /*
 857  * Returns TRUE if a partition on the same disk is already being
 858  * checked.
 859  */
 860 static int device_already_active(char *device)
 861 {
 862         struct fsck_instance *inst;
 863         char *base;
 864
 865         if (force_all_parallel)
 866                 return 0;
 867
 868 #ifdef BASE_MD
 869         /* Don't check a soft raid disk with any other disk */
 870         if (instance_list &&
 871             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
 872              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
 873                 return 1;
 874 #endif
 875
 876         base = base_device(device);
 877         /*
 878          * If we don't know the base device, assume that the device is
 879          * already active if there are any fsck instances running.
 880          */
 881         if (!base)
 882                 return (instance_list != 0);
 883         for (inst = instance_list; inst; inst = inst->next) {
 884                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
 885                         free(base);
 886                         return 1;
 887                 }
 888         }
 889         free(base);
 890         return 0;
 891 }
 892
 893 /* Check all file systems, using the /etc/fstab table. */
 894 static int check_all(NOARGS)
 895 {
 896         struct fs_info *fs = NULL;
 897         int status = EXIT_OK;
 898         int not_done_yet = 1;
 899         int passno = 1;
 900         int pass_done;
 901
 902         if (verbose)
 903                 printf(_("Checking all file systems.\n"));
 904
 905         /*
 906          * Do an initial scan over the filesystem; mark filesystems
 907          * which should be ignored as done, and resolve LABEL= and
 908          * UUID= specifications to the real device.
 909          */
 910         for (fs = filesys_info; fs; fs = fs->next) {
 911                 if (ignore(fs))
 912                         fs->flags |= FLAG_DONE;
 913         }
 914
 915         /*
 916          * Find and check the root filesystem.
 917          */
 918         if (!parallel_root) {
 919                 for (fs = filesys_info; fs; fs = fs->next) {
 920                         if (!strcmp(fs->mountpt, "/"))
 921                                 break;
 922                 }
 923                 if (fs) {
 924                         if (!skip_root && !ignore(fs)) {
 925                                 fsck_device(fs, 1);
 926                                 status |= wait_all(0);
 927                                 if (status > EXIT_NONDESTRUCT)
 928                                         return status;
 929                         }
 930                         fs->flags |= FLAG_DONE;
 931                 }
 932         }
 933         /*
 934          * This is for the bone-headed user who enters the root
 935          * filesystem twice.  Skip root will skep all root entries.
 936          */
 937         if (skip_root)
 938                 for (fs = filesys_info; fs; fs = fs->next)
 939                         if (!strcmp(fs->mountpt, "/"))
 940                                 fs->flags |= FLAG_DONE;
 941
 942         while (not_done_yet) {
 943                 not_done_yet = 0;
 944                 pass_done = 1;
 945
 946                 for (fs = filesys_info; fs; fs = fs->next) {
 947                         if (cancel_requested)
 948                                 break;
 949                         if (fs->flags & FLAG_DONE)
 950                                 continue;
 951                         /*
 952                          * If the filesystem's pass number is higher
 953                          * than the current pass number, then we don't
 954                          * do it yet.
 955                          */
 956                         if (fs->passno > passno) {
 957                                 not_done_yet++;
 958                                 continue;
 959                         }
 960                         /*
 961                          * If a filesystem on a particular device has
 962                          * already been spawned, then we need to defer
 963                          * this to another pass.
 964                          */
 965                         if (device_already_active(fs->device)) {
 966                                 pass_done = 0;
 967                                 continue;
 968                         }
 969                         /*
 970                          * Spawn off the fsck process
 971                          */
 972                         fsck_device(fs, serialize);
 973                         fs->flags |= FLAG_DONE;
 974
 975                         /*
 976                          * Only do one filesystem at a time, or if we
 977                          * have a limit on the number of fsck's extant
 978                          * at one time, apply that limit.
 979                          */
 980                         if (serialize ||
 981                             (max_running && (num_running >= max_running))) {
 982                                 pass_done = 0;
 983                                 break;
 984                         }
 985                 }
 986                 if (cancel_requested)
 987                         break;
 988                 if (verbose > 1)
 989                         printf(_("--waiting-- (pass %d)\n"), passno);
 990                 status |= wait_all(pass_done ? 0 : WNOHANG);
 991                 if (pass_done) {
 992                         if (verbose > 1)
 993                                 printf("----------------------------------\n");
 994                         passno++;
 995                 } else
 996                         not_done_yet++;
 997         }
 998         if (cancel_requested && !kill_sent) {
 999                 kill_all(SIGTERM);
1000                 kill_sent++;
1001         }
1002         status |= wait_all(0);
1003         return status;
1004 }
1005
1006 static void usage(NOARGS)
1007 {
1008         fprintf(stderr,
1009                 _("Usage: fsck [-ACNPRTV] [-t fstype] [fs-options] [filesys ...]\n"));
1010         exit(EXIT_USAGE);
1011 }
1012
1013 #ifdef HAVE_SIGNAL_H
1014 static void signal_cancel(int sig)
1015 {
1016         cancel_requested++;
1017 }
1018 #endif
1019
1020 static void PRS(int argc, char *argv[])
1021 {
1022         int     i, j;
1023         char    *arg, *dev, *tmp = 0;
1024         char    options[128];
1025         int     opt = 0;
1026         int     opts_for_fsck = 0;
1027 #ifdef HAVE_SIGNAL_H
1028         struct sigaction        sa;
1029
1030         /*
1031          * Set up signal action
1032          */
1033         memset(&sa, 0, sizeof(struct sigaction));
1034         sa.sa_handler = signal_cancel;
1035         sigaction(SIGINT, &sa, 0);
1036         sigaction(SIGTERM, &sa, 0);
1037 #endif
1038
1039         num_devices = 0;
1040         num_args = 0;
1041         instance_list = 0;
1042
1043         progname = argv[0];
1044
1045         for (i=1; i < argc; i++) {
1046                 arg = argv[i];
1047                 if (!arg)
1048                         continue;
1049                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1050                         if (num_devices >= MAX_DEVICES) {
1051                                 fprintf(stderr, _("%s: too many devices\n"),
1052                                         progname);
1053                                 exit(EXIT_ERROR);
1054                         }
1055                         dev = blkid_get_devname(cache, arg, NULL);
1056                         if (!dev && strchr(arg, '=')) {
1057                                 /*
1058                                  * Check to see if we failed because
1059                                  * /proc/partitions isn't found.
1060                                  */
1061                                 if (access("/proc/partitions", R_OK) < 0) {
1062                                         fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1063                                                 strerror(errno));
1064                                         fprintf(stderr, "Is /proc mounted?\n");
1065                                         exit(EXIT_ERROR);
1066                                 }
1067                                 /*
1068                                  * Check to see if this is because
1069                                  * we're not running as root
1070                                  */
1071                                 if (geteuid())
1072                                         fprintf(stderr,
1073                 "Must be root to scan for matching filesystems: %s\n", arg);
1074                                 else
1075                                         fprintf(stderr,
1076                 "Couldn't find matching filesystem: %s\n", arg);
1077                                 exit(EXIT_ERROR);
1078                         }
1079                         devices[num_devices++] = dev ? dev : string_copy(arg);
1080                         continue;
1081                 }
1082                 if (arg[0] != '-' || opts_for_fsck) {
1083                         if (num_args >= MAX_ARGS) {
1084                                 fprintf(stderr, _("%s: too many arguments\n"),
1085                                         progname);
1086                                 exit(EXIT_ERROR);
1087                         }
1088                         args[num_args++] = string_copy(arg);
1089                         continue;
1090                 }
1091                 for (j=1; arg[j]; j++) {
1092                         if (opts_for_fsck) {
1093                                 options[++opt] = arg[j];
1094                                 continue;
1095                         }
1096                         switch (arg[j]) {
1097                         case 'A':
1098                                 doall++;
1099                                 break;
1100                         case 'C':
1101                                 progress++;
1102                                 break;
1103                         case 'V':
1104                                 verbose++;
1105                                 break;
1106                         case 'N':
1107                                 noexecute++;
1108                                 break;
1109                         case 'R':
1110                                 skip_root++;
1111                                 break;
1112                         case 'T':
1113                                 notitle++;
1114                                 break;
1115                         case 'M':
1116                                 like_mount++;
1117                                 break;
1118                         case 'P':
1119                                 parallel_root++;
1120                                 break;
1121                         case 's':
1122                                 serialize++;
1123                                 break;
1124                         case 't':
1125                                 if (fstype)
1126                                         usage();
1127                                 if (arg[j+1])
1128                                         tmp = arg+j+1;
1129                                 else if ((i+1) < argc)
1130                                         tmp = argv[++i];
1131                                 else
1132                                         usage();
1133                                 fstype = string_copy(tmp);
1134                                 compile_fs_type(fstype, &fs_type_compiled);
1135                                 goto next_arg;
1136                         case '-':
1137                                 opts_for_fsck++;
1138                                 break;
1139                         case '?':
1140                                 usage();
1141                                 break;
1142                         default:
1143                                 options[++opt] = arg[j];
1144                                 break;
1145                         }
1146                 }
1147         next_arg:
1148                 if (opt) {
1149                         options[0] = '-';
1150                         options[++opt] = '\0';
1151                         if (num_args >= MAX_ARGS) {
1152                                 fprintf(stderr,
1153                                         _("%s: too many arguments\n"),
1154                                         progname);
1155                                 exit(EXIT_ERROR);
1156                         }
1157                         args[num_args++] = string_copy(options);
1158                         opt = 0;
1159                 }
1160         }
1161         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1162                 force_all_parallel++;
1163         if ((tmp = getenv("FSCK_MAX_INST")))
1164             max_running = atoi(tmp);
1165 }
1166
1167 int main(int argc, char *argv[])
1168 {
1169         int i, status = 0;
1170         int interactive = 0;
1171         char *type, *oldpath = getenv("PATH");
1172         const char *fstab;
1173         struct fs_info *fs;
1174
1175 #ifdef ENABLE_NLS
1176         setlocale(LC_MESSAGES, "");
1177         setlocale(LC_CTYPE, "");
1178         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1179         textdomain(NLS_CAT_NAME);
1180 #endif
1181         blkid_get_cache(&cache, NULL);
1182         PRS(argc, argv);
1183
1184         if (!notitle)
1185                 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1186
1187         fstab = getenv("FSTAB_FILE");
1188         if (!fstab)
1189                 fstab = _PATH_MNTTAB;
1190         load_fs_info(fstab);
1191
1192         /* Update our search path to include uncommon directories. */
1193         if (oldpath) {
1194                 fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1195                                     strlen (oldpath) + 1);
1196                 strcpy (fsck_path, fsck_prefix_path);
1197                 strcat (fsck_path, ":");
1198                 strcat (fsck_path, oldpath);
1199         } else {
1200                 fsck_path = string_copy(fsck_prefix_path);
1201         }
1202
1203         if ((num_devices == 1) || (serialize))
1204                 interactive = 1;
1205
1206         /* If -A was specified ("check all"), do that! */
1207         if (doall)
1208                 return check_all();
1209
1210         if (num_devices == 0) {
1211                 serialize++;
1212                 interactive++;
1213                 return check_all();
1214         }
1215         for (i = 0 ; i < num_devices; i++) {
1216                 if (cancel_requested) {
1217                         if (!kill_sent) {
1218                                 kill_all(SIGTERM);
1219                                 kill_sent++;
1220                         }
1221                         break;
1222                 }
1223                 fs = lookup(devices[i]);
1224                 if (!fs) {
1225                         type = blkid_get_tag_value(cache, "TYPE", devices[i]);
1226                         if (!type) {
1227                                 fprintf(stderr, _("Could not determine "
1228                                                   "filesystem type for %s\n"),
1229                                         devices[i]);
1230                                 continue;
1231                         }
1232                         fs = create_fs_device(devices[i], 0, type, 0, -1, -1);
1233                         free(type);
1234                         if (!fs)
1235                                 continue;
1236                 }
1237                 fsck_device(fs, interactive);
1238                 if (serialize ||
1239                     (max_running && (num_running >= max_running))) {
1240                         struct fsck_instance *inst;
1241
1242                         inst = wait_one(0);
1243                         if (inst) {
1244                                 status |= inst->exit_status;
1245                                 free_instance(inst);
1246                         }
1247                         if (verbose > 1)
1248                                 printf("----------------------------------\n");
1249                 }
1250         }
1251         status |= wait_all(0);
1252         free(fsck_path);
1253         blkid_put_cache(cache);
1254         return status;
1255 }