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