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  * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
  12  *   o Changed -t fstype to behave like with mount when -A (all file
  13  *     systems) or -M (like mount) is specified.
  14  *   o fsck looks if it can find the fsck.type program to decide
  15  *     if it should ignore the fs type. This way more fsck programs
  16  *     can be added without changing this front-end.
  17  *   o -R flag skip root file system.
  18  *
  19  * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
  20  *      2001, 2002, 2003, 2004, 2005 by  Theodore Ts'o.
  21  *
  22  * %Begin-Header%
  23  * This file may be redistributed under the terms of the GNU Public
  24  * License.
  25  * %End-Header%
  26  */
  27
  28 #define _XOPEN_SOURCE 600 /* for inclusion of sa_handler in Solaris */
  29
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32 #include <sys/signal.h>
  33 #include <sys/stat.h>
  34 #include <limits.h>
  35 #include <stdio.h>
  36 #include <ctype.h>
  37 #include <string.h>
  38 #include <time.h>
  39 #if HAVE_STDLIB_H
  40 #include <stdlib.h>
  41 #endif
  42 #if HAVE_ERRNO_H
  43 #include <errno.h>
  44 #endif
  45 #if HAVE_PATHS_H
  46 #include <paths.h>
  47 #endif
  48 #if HAVE_UNISTD_H
  49 #include <unistd.h>
  50 #endif
  51 #if HAVE_ERRNO_H
  52 #include <errno.h>
  53 #endif
  54 #if HAVE_MALLOC_H
  55 #include <malloc.h>
  56 #endif
  57 #ifdef HAVE_SIGNAL_H
  58 #include <signal.h>
  59 #endif
  60
  61 #include "../version.h"
  62 #include "nls-enable.h"
  63 #include "fsck.h"
  64 #include "blkid/blkid.h"
  65
  66 #ifndef _PATH_MNTTAB
  67 #define _PATH_MNTTAB    "/etc/fstab"
  68 #endif
  69
  70 static const char *ignored_types[] = {
  71         "ignore",
  72         "iso9660",
  73         "nfs",
  74         "proc",
  75         "sw",
  76         "swap",
  77         "tmpfs",
  78         "devpts",
  79         NULL
  80 };
  81
  82 static const char *really_wanted[] = {
  83         "minix",
  84         "ext2",
  85         "ext3",
  86         "ext4",
  87         "ext4dev",
  88         "jfs",
  89         "reiserfs",
  90         "xiafs",
  91         "xfs",
  92         NULL
  93 };
  94
  95 #define BASE_MD "/dev/md"
  96
  97 /*
  98  * Global variables for options
  99  */
 100 char *devices[MAX_DEVICES];
 101 char *args[MAX_ARGS];
 102 int num_devices, num_args;
 103
 104 int verbose = 0;
 105 int doall = 0;
 106 int noexecute = 0;
 107 int serialize = 0;
 108 int skip_root = 0;
 109 int ignore_mounted = 0;
 110 int notitle = 0;
 111 int parallel_root = 0;
 112 int progress = 0;
 113 int progress_fd = 0;
 114 int force_all_parallel = 0;
 115 int num_running = 0;
 116 int max_running = 0;
 117 volatile int cancel_requested = 0;
 118 int kill_sent = 0;
 119 char *progname;
 120 char *fstype = NULL;
 121 struct fs_info *filesys_info = NULL, *filesys_last = NULL;
 122 struct fsck_instance *instance_list;
 123 const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
 124 char *fsck_path = 0;
 125 blkid_cache cache = NULL;
 126
 127 static char *string_copy(const char *s)
 128 {
 129         char    *ret;
 130
 131         if (!s)
 132                 return 0;
 133         ret = malloc(strlen(s)+1);
 134         if (ret)
 135                 strcpy(ret, s);
 136         return ret;
 137 }
 138
 139 static int string_to_int(const char *s)
 140 {
 141         long l;
 142         char *p;
 143
 144         l = strtol(s, &p, 0);
 145         if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
 146                 return -1;
 147         else
 148                 return (int) l;
 149 }
 150
 151 static int ignore(struct fs_info *);
 152
 153 static char *skip_over_blank(char *cp)
 154 {
 155         while (*cp && isspace(*cp))
 156                 cp++;
 157         return cp;
 158 }
 159
 160 static char *skip_over_word(char *cp)
 161 {
 162         while (*cp && !isspace(*cp))
 163                 cp++;
 164         return cp;
 165 }
 166
 167 static void strip_line(char *line)
 168 {
 169         char    *p;
 170
 171         while (*line) {
 172                 p = line + strlen(line) - 1;
 173                 if ((*p == '\n') || (*p == '\r'))
 174                         *p = 0;
 175                 else
 176                         break;
 177         }
 178 }
 179
 180 static char *parse_word(char **buf)
 181 {
 182         char *word, *next;
 183
 184         word = *buf;
 185         if (*word == 0)
 186                 return 0;
 187
 188         word = skip_over_blank(word);
 189         next = skip_over_word(word);
 190         if (*next)
 191                 *next++ = 0;
 192         *buf = next;
 193         return word;
 194 }
 195
 196 static void parse_escape(char *word)
 197 {
 198         char    *p, *q;
 199         int     ac, i;
 200
 201         if (!word)
 202                 return;
 203
 204         for (p = word, q = word; *p; p++, q++) {
 205                 *q = *p;
 206                 if (*p != '\\')
 207                         continue;
 208                 if (*++p == 0)
 209                         break;
 210                 if (*p == 't') {
 211                         *q = '\t';
 212                         continue;
 213                 }
 214                 if (*p == 'n') {
 215                         *q = '\n';
 216                         continue;
 217                 }
 218                 if (!isdigit(*p)) {
 219                         *q = *p;
 220                         continue;
 221                 }
 222                 ac = 0;
 223                 for (i = 0; i < 3; i++, p++) {
 224                         if (!isdigit(*p))
 225                                 break;
 226                         ac = (ac * 8) + (*p - '0');
 227                 }
 228                 *q = ac;
 229                 p--;
 230         }
 231         *q = 0;
 232 }
 233
 234 static void free_instance(struct fsck_instance *i)
 235 {
 236         free(i->prog);
 237         free(i->device);
 238         free(i->base_device);
 239         free(i);
 240         return;
 241 }
 242
 243 static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
 244                                         const char *type, const char *opts,
 245                                         int freq, int passno)
 246 {
 247         struct fs_info *fs;
 248
 249         if (!(fs = malloc(sizeof(struct fs_info))))
 250                 return NULL;
 251
 252         fs->device = string_copy(device);
 253         fs->mountpt = string_copy(mntpnt);
 254         fs->type = string_copy(type);
 255         fs->opts = string_copy(opts ? opts : "");
 256         fs->freq = freq;
 257         fs->passno = passno;
 258         fs->flags = 0;
 259         fs->next = NULL;
 260
 261         if (!filesys_info)
 262                 filesys_info = fs;
 263         else
 264                 filesys_last->next = fs;
 265         filesys_last = fs;
 266
 267         return fs;
 268 }
 269
 270
 271
 272 static int parse_fstab_line(char *line, struct fs_info **ret_fs)
 273 {
 274         char    *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
 275         struct fs_info *fs;
 276
 277         *ret_fs = 0;
 278         strip_line(line);
 279         cp = line;
 280
 281         device = parse_word(&cp);
 282         if (!device || *device == '#')
 283                 return 0;       /* Ignore blank lines and comments */
 284         mntpnt = parse_word(&cp);
 285         type = parse_word(&cp);
 286         opts = parse_word(&cp);
 287         freq = parse_word(&cp);
 288         passno = parse_word(&cp);
 289
 290         if (!mntpnt || !type)
 291                 return -1;
 292
 293         parse_escape(device);
 294         parse_escape(mntpnt);
 295         parse_escape(type);
 296         parse_escape(opts);
 297         parse_escape(freq);
 298         parse_escape(passno);
 299
 300         dev = blkid_get_devname(cache, device, NULL);
 301         if (dev)
 302                 device = dev;
 303
 304         if (strchr(type, ','))
 305                 type = 0;
 306
 307         fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
 308                               freq ? atoi(freq) : -1,
 309                               passno ? atoi(passno) : -1);
 310         free(dev);
 311
 312         if (!fs)
 313                 return -1;
 314         *ret_fs = fs;
 315         return 0;
 316 }
 317
 318 static void interpret_type(struct fs_info *fs)
 319 {
 320         char    *t;
 321
 322         if (strcmp(fs->type, "auto") != 0)
 323                 return;
 324         t = blkid_get_tag_value(cache, "TYPE", fs->device);
 325         if (t) {
 326                 free(fs->type);
 327                 fs->type = t;
 328         }
 329 }
 330
 331 /*
 332  * Load the filesystem database from /etc/fstab
 333  */
 334 static void load_fs_info(const char *filename)
 335 {
 336         FILE    *f;
 337         char    buf[1024];
 338         int     lineno = 0;
 339         int     old_fstab = 1;
 340         struct fs_info *fs;
 341
 342         if ((f = fopen(filename, "r")) == NULL) {
 343                 fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
 344                         filename, strerror(errno));
 345                 return;
 346         }
 347         while (!feof(f)) {
 348                 lineno++;
 349                 if (!fgets(buf, sizeof(buf), f))
 350                         break;
 351                 buf[sizeof(buf)-1] = 0;
 352                 if (parse_fstab_line(buf, &fs) < 0) {
 353                         fprintf(stderr, _("WARNING: bad format "
 354                                 "on line %d of %s\n"), lineno, filename);
 355                         continue;
 356                 }
 357                 if (!fs)
 358                         continue;
 359                 if (fs->passno < 0)
 360                         fs->passno = 0;
 361                 else
 362                         old_fstab = 0;
 363         }
 364
 365         fclose(f);
 366
 367         if (old_fstab && filesys_info) {
 368                 fputs(_("\007\007\007"
 369                 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
 370                 "       field.  I will kludge around things for you, but you\n"
 371                 "       should fix your /etc/fstab file as soon as you can.\n\n"), stderr);
 372
 373                 for (fs = filesys_info; fs; fs = fs->next) {
 374                         fs->passno = 1;
 375                 }
 376         }
 377 }
 378
 379 /* Lookup filesys in /etc/fstab and return the corresponding entry. */
 380 static struct fs_info *lookup(char *filesys)
 381 {
 382         struct fs_info *fs;
 383
 384         /* No filesys name given. */
 385         if (filesys == NULL)
 386                 return NULL;
 387
 388         for (fs = filesys_info; fs; fs = fs->next) {
 389                 if (!strcmp(filesys, fs->device) ||
 390                     (fs->mountpt && !strcmp(filesys, fs->mountpt)))
 391                         break;
 392         }
 393
 394         return fs;
 395 }
 396
 397 /* Find fsck program for a given fs type. */
 398 static char *find_fsck(char *type)
 399 {
 400   char *s;
 401   const char *tpl;
 402   static char prog[256];
 403   char *p = string_copy(fsck_path);
 404   struct stat st;
 405
 406   /* Are we looking for a program or just a type? */
 407   tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
 408
 409   for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
 410         sprintf(prog, tpl, s, type);
 411         if (stat(prog, &st) == 0) break;
 412   }
 413   free(p);
 414   return(s ? prog : NULL);
 415 }
 416
 417 static int progress_active(NOARGS)
 418 {
 419         struct fsck_instance *inst;
 420
 421         for (inst = instance_list; inst; inst = inst->next) {
 422                 if (inst->flags & FLAG_DONE)
 423                         continue;
 424                 if (inst->flags & FLAG_PROGRESS)
 425                         return 1;
 426         }
 427         return 0;
 428 }
 429
 430 /*
 431  * Execute a particular fsck program, and link it into the list of
 432  * child processes we are waiting for.
 433  */
 434 static int execute(const char *type, const char *device, const char *mntpt,
 435                    int interactive)
 436 {
 437         char *s, *argv[80], prog[80];
 438         int  argc, i;
 439         struct fsck_instance *inst, *p;
 440         pid_t   pid;
 441
 442         inst = malloc(sizeof(struct fsck_instance));
 443         if (!inst)
 444                 return ENOMEM;
 445         memset(inst, 0, sizeof(struct fsck_instance));
 446
 447         sprintf(prog, "fsck.%s", type);
 448         argv[0] = string_copy(prog);
 449         argc = 1;
 450
 451         for (i=0; i <num_args; i++)
 452                 argv[argc++] = string_copy(args[i]);
 453
 454         if (progress) {
 455                 if ((strcmp(type, "ext2") == 0) ||
 456                     (strcmp(type, "ext3") == 0) ||
 457                     (strcmp(type, "ext4") == 0) ||
 458                     (strcmp(type, "ext4dev") == 0)) {
 459                         char tmp[80];
 460
 461                         tmp[0] = 0;
 462                         if (!progress_active()) {
 463                                 snprintf(tmp, 80, "-C%d", progress_fd);
 464                                 inst->flags |= FLAG_PROGRESS;
 465                         } else if (progress_fd)
 466                                 snprintf(tmp, 80, "-C%d", progress_fd * -1);
 467                         if (tmp[0])
 468                                 argv[argc++] = string_copy(tmp);
 469                 }
 470         }
 471
 472         argv[argc++] = string_copy(device);
 473         argv[argc] = 0;
 474
 475         s = find_fsck(prog);
 476         if (s == NULL) {
 477                 fprintf(stderr, _("fsck: %s: not found\n"), prog);
 478                 free(inst);
 479                 return ENOENT;
 480         }
 481
 482         if (verbose || noexecute) {
 483                 printf("[%s (%d) -- %s] ", s, num_running,
 484                        mntpt ? mntpt : device);
 485                 for (i=0; i < argc; i++)
 486                         printf("%s ", argv[i]);
 487                 printf("\n");
 488         }
 489
 490         /* Fork and execute the correct program. */
 491         if (noexecute)
 492                 pid = -1;
 493         else if ((pid = fork()) < 0) {
 494                 perror("fork");
 495                 free(inst);
 496                 return errno;
 497         } else if (pid == 0) {
 498                 if (!interactive)
 499                         close(0);
 500                 (void) execv(s, argv);
 501                 perror(argv[0]);
 502                 free(inst);
 503                 exit(EXIT_ERROR);
 504         }
 505
 506         for (i=0; i < argc; i++)
 507                 free(argv[i]);
 508
 509         inst->pid = pid;
 510         inst->prog = string_copy(prog);
 511         inst->type = string_copy(type);
 512         inst->device = string_copy(device);
 513         inst->base_device = base_device(device);
 514         inst->start_time = time(0);
 515         inst->next = NULL;
 516
 517         /*
 518          * Find the end of the list, so we add the instance on at the end.
 519          */
 520         for (p = instance_list; p && p->next; p = p->next);
 521
 522         if (p)
 523                 p->next = inst;
 524         else
 525                 instance_list = inst;
 526
 527         return 0;
 528 }
 529
 530 /*
 531  * Send a signal to all outstanding fsck child processes
 532  */
 533 static int kill_all(int signum)
 534 {
 535         struct fsck_instance *inst;
 536         int     n = 0;
 537
 538         for (inst = instance_list; inst; inst = inst->next) {
 539                 if (inst->flags & FLAG_DONE)
 540                         continue;
 541                 kill(inst->pid, signum);
 542                 n++;
 543         }
 544         return n;
 545 }
 546
 547 /*
 548  * Wait for one child process to exit; when it does, unlink it from
 549  * the list of executing child processes, and return it.
 550  */
 551 static struct fsck_instance *wait_one(int flags)
 552 {
 553         int     status;
 554         int     sig;
 555         struct fsck_instance *inst, *inst2, *prev;
 556         pid_t   pid;
 557
 558         if (!instance_list)
 559                 return NULL;
 560
 561         if (noexecute) {
 562                 inst = instance_list;
 563                 prev = 0;
 564 #ifdef RANDOM_DEBUG
 565                 while (inst->next && (random() & 1)) {
 566                         prev = inst;
 567                         inst = inst->next;
 568                 }
 569 #endif
 570                 inst->exit_status = 0;
 571                 goto ret_inst;
 572         }
 573
 574         /*
 575          * gcc -Wall fails saving throw against stupidity
 576          * (inst and prev are thought to be uninitialized variables)
 577          */
 578         inst = prev = NULL;
 579
 580         do {
 581                 pid = waitpid(-1, &status, flags);
 582                 if (cancel_requested && !kill_sent) {
 583                         kill_all(SIGTERM);
 584                         kill_sent++;
 585                 }
 586                 if ((pid == 0) && (flags & WNOHANG))
 587                         return NULL;
 588                 if (pid < 0) {
 589                         if ((errno == EINTR) || (errno == EAGAIN))
 590                                 continue;
 591                         if (errno == ECHILD) {
 592                                 fprintf(stderr,
 593                                         _("%s: wait: No more child process?!?\n"),
 594                                         progname);
 595                                 return NULL;
 596                         }
 597                         perror("wait");
 598                         continue;
 599                 }
 600                 for (prev = 0, inst = instance_list;
 601                      inst;
 602                      prev = inst, inst = inst->next) {
 603                         if (inst->pid == pid)
 604                                 break;
 605                 }
 606         } while (!inst);
 607
 608         if (WIFEXITED(status))
 609                 status = WEXITSTATUS(status);
 610         else if (WIFSIGNALED(status)) {
 611                 sig = WTERMSIG(status);
 612                 if (sig == SIGINT) {
 613                         status = EXIT_UNCORRECTED;
 614                 } else {
 615                         printf(_("Warning... %s for device %s exited "
 616                                "with signal %d.\n"),
 617                                inst->prog, inst->device, sig);
 618                         status = EXIT_ERROR;
 619                 }
 620         } else {
 621                 printf(_("%s %s: status is %x, should never happen.\n"),
 622                        inst->prog, inst->device, status);
 623                 status = EXIT_ERROR;
 624         }
 625         inst->exit_status = status;
 626         inst->flags |= FLAG_DONE;
 627         if (progress && (inst->flags & FLAG_PROGRESS) &&
 628             !progress_active()) {
 629                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 630                         if (inst2->flags & FLAG_DONE)
 631                                 continue;
 632                         if (strcmp(inst2->type, "ext2") &&
 633                             strcmp(inst2->type, "ext3") &&
 634                             strcmp(inst2->type, "ext4") &&
 635                             strcmp(inst2->type, "ext4dev"))
 636                                 continue;
 637                         /*
 638                          * If we've just started the fsck, wait a tiny
 639                          * bit before sending the kill, to give it
 640                          * time to set up the signal handler
 641                          */
 642                         if (inst2->start_time < time(0)+2) {
 643                                 if (fork() == 0) {
 644                                         sleep(1);
 645                                         kill(inst2->pid, SIGUSR1);
 646                                         exit(0);
 647                                 }
 648                         } else
 649                                 kill(inst2->pid, SIGUSR1);
 650                         inst2->flags |= FLAG_PROGRESS;
 651                         break;
 652                 }
 653         }
 654 ret_inst:
 655         if (prev)
 656                 prev->next = inst->next;
 657         else
 658                 instance_list = inst->next;
 659         if (verbose > 1)
 660                 printf(_("Finished with %s (exit status %d)\n"),
 661                        inst->device, inst->exit_status);
 662         num_running--;
 663         return inst;
 664 }
 665
 666 #define FLAG_WAIT_ALL           0
 667 #define FLAG_WAIT_ATLEAST_ONE   1
 668 /*
 669  * Wait until all executing child processes have exited; return the
 670  * logical OR of all of their exit code values.
 671  */
 672 static int wait_many(int flags)
 673 {
 674         struct fsck_instance *inst;
 675         int     global_status = 0;
 676         int     wait_flags = 0;
 677
 678         while ((inst = wait_one(wait_flags))) {
 679                 global_status |= inst->exit_status;
 680                 free_instance(inst);
 681 #ifdef RANDOM_DEBUG
 682                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 683                         break;
 684 #endif
 685                 if (flags & FLAG_WAIT_ATLEAST_ONE)
 686                         wait_flags = WNOHANG;
 687         }
 688         return global_status;
 689 }
 690
 691 /*
 692  * Run the fsck program on a particular device
 693  *
 694  * If the type is specified using -t, and it isn't prefixed with "no"
 695  * (as in "noext2") and only one filesystem type is specified, then
 696  * use that type regardless of what is specified in /etc/fstab.
 697  *
 698  * If the type isn't specified by the user, then use either the type
 699  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 700  */
 701 static void fsck_device(struct fs_info *fs, int interactive)
 702 {
 703         const char *type;
 704         int retval;
 705
 706         interpret_type(fs);
 707
 708         if (strcmp(fs->type, "auto") != 0)
 709                 type = fs->type;
 710         else if (fstype && strncmp(fstype, "no", 2) &&
 711             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 712             !strchr(fstype, ','))
 713                 type = fstype;
 714         else
 715                 type = DEFAULT_FSTYPE;
 716
 717         num_running++;
 718         retval = execute(type, fs->device, fs->mountpt, interactive);
 719         if (retval) {
 720                 fprintf(stderr, _("%s: Error %d while executing fsck.%s "
 721                         "for %s\n"), progname, retval, type, fs->device);
 722                 num_running--;
 723         }
 724 }
 725
 726
 727 /*
 728  * Deal with the fsck -t argument.
 729  */
 730 struct fs_type_compile {
 731         char **list;
 732         int *type;
 733         int  negate;
 734 } fs_type_compiled;
 735
 736 #define FS_TYPE_NORMAL  0
 737 #define FS_TYPE_OPT     1
 738 #define FS_TYPE_NEGOPT  2
 739
 740 static const char *fs_type_syntax_error =
 741 N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
 742    "with 'no' or '!'.\n");
 743
 744 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 745 {
 746         char    *cp, *list, *s;
 747         int     num = 2;
 748         int     negate, first_negate = 1;
 749
 750         if (fs_type) {
 751                 for (cp=fs_type; *cp; cp++) {
 752                         if (*cp == ',')
 753                                 num++;
 754                 }
 755         }
 756
 757         cmp->list = malloc(num * sizeof(char *));
 758         cmp->type = malloc(num * sizeof(int));
 759         if (!cmp->list || !cmp->type) {
 760                 fputs(_("Couldn't allocate memory for filesystem types\n"),
 761                       stderr);
 762                 exit(EXIT_ERROR);
 763         }
 764         memset(cmp->list, 0, num * sizeof(char *));
 765         memset(cmp->type, 0, num * sizeof(int));
 766         cmp->negate = 0;
 767
 768         if (!fs_type)
 769                 return;
 770
 771         list = string_copy(fs_type);
 772         num = 0;
 773         s = strtok(list, ",");
 774         while(s) {
 775                 negate = 0;
 776                 if (strncmp(s, "no", 2) == 0) {
 777                         s += 2;
 778                         negate = 1;
 779                 } else if (*s == '!') {
 780                         s++;
 781                         negate = 1;
 782                 }
 783                 if (strcmp(s, "loop") == 0)
 784                         /* loop is really short-hand for opts=loop */
 785                         goto loop_special_case;
 786                 else if (strncmp(s, "opts=", 5) == 0) {
 787                         s += 5;
 788                 loop_special_case:
 789                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 790                 } else {
 791                         if (first_negate) {
 792                                 cmp->negate = negate;
 793                                 first_negate = 0;
 794                         }
 795                         if ((negate && !cmp->negate) ||
 796                             (!negate && cmp->negate)) {
 797                                 fputs(_(fs_type_syntax_error), stderr);
 798                                 exit(EXIT_USAGE);
 799                         }
 800                 }
 801 #if 0
 802                 printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
 803 #endif
 804                 cmp->list[num++] = string_copy(s);
 805                 s = strtok(NULL, ",");
 806         }
 807         free(list);
 808 }
 809
 810 /*
 811  * This function returns true if a particular option appears in a
 812  * comma-delimited options list
 813  */
 814 static int opt_in_list(const char *opt, char *optlist)
 815 {
 816         char    *list, *s;
 817
 818         if (!optlist)
 819                 return 0;
 820         list = string_copy(optlist);
 821
 822         s = strtok(list, ",");
 823         while(s) {
 824                 if (strcmp(s, opt) == 0) {
 825                         free(list);
 826                         return 1;
 827                 }
 828                 s = strtok(NULL, ",");
 829         }
 830         free(list);
 831         return 0;
 832 }
 833
 834 /* See if the filesystem matches the criteria given by the -t option */
 835 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 836 {
 837         int n, ret = 0, checked_type = 0;
 838         char *cp;
 839
 840         if (cmp->list == 0 || cmp->list[0] == 0)
 841                 return 1;
 842
 843         for (n=0; (cp = cmp->list[n]); n++) {
 844                 switch (cmp->type[n]) {
 845                 case FS_TYPE_NORMAL:
 846                         checked_type++;
 847                         if (strcmp(cp, fs->type) == 0) {
 848                                 ret = 1;
 849                         }
 850                         break;
 851                 case FS_TYPE_NEGOPT:
 852                         if (opt_in_list(cp, fs->opts))
 853                                 return 0;
 854                         break;
 855                 case FS_TYPE_OPT:
 856                         if (!opt_in_list(cp, fs->opts))
 857                                 return 0;
 858                         break;
 859                 }
 860         }
 861         if (checked_type == 0)
 862                 return 1;
 863         return (cmp->negate ? !ret : ret);
 864 }
 865
 866 /* Check if we should ignore this filesystem. */
 867 static int ignore(struct fs_info *fs)
 868 {
 869         const char **ip;
 870         int wanted = 0;
 871
 872         /*
 873          * If the pass number is 0, ignore it.
 874          */
 875         if (fs->passno == 0)
 876                 return 1;
 877
 878         /*
 879          * If this is a bind mount, ignore it.
 880          */
 881         if (opt_in_list("bind", fs->opts)) {
 882                 fprintf(stderr,
 883                         _("%s: skipping bad line in /etc/fstab: bind mount with nonzero fsck pass number\n"),
 884                         fs->mountpt);
 885                 return 1;
 886         }
 887
 888         interpret_type(fs);
 889
 890         /*
 891          * If a specific fstype is specified, and it doesn't match,
 892          * ignore it.
 893          */
 894         if (!fs_match(fs, &fs_type_compiled)) return 1;
 895
 896         /* Are we ignoring this type? */
 897         for(ip = ignored_types; *ip; ip++)
 898                 if (strcmp(fs->type, *ip) == 0) return 1;
 899
 900         /* Do we really really want to check this fs? */
 901         for(ip = really_wanted; *ip; ip++)
 902                 if (strcmp(fs->type, *ip) == 0) {
 903                         wanted = 1;
 904                         break;
 905                 }
 906
 907         /* See if the <fsck.fs> program is available. */
 908         if (find_fsck(fs->type) == NULL) {
 909                 if (wanted)
 910                         fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
 911                                 fs->device, fs->type);
 912                 return 1;
 913         }
 914
 915         /* We can and want to check this file system type. */
 916         return 0;
 917 }
 918
 919 /*
 920  * Returns TRUE if a partition on the same disk is already being
 921  * checked.
 922  */
 923 static int device_already_active(char *device)
 924 {
 925         struct fsck_instance *inst;
 926         char *base;
 927
 928         if (force_all_parallel)
 929                 return 0;
 930
 931 #ifdef BASE_MD
 932         /* Don't check a soft raid disk with any other disk */
 933         if (instance_list &&
 934             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
 935              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
 936                 return 1;
 937 #endif
 938
 939         base = base_device(device);
 940         /*
 941          * If we don't know the base device, assume that the device is
 942          * already active if there are any fsck instances running.
 943          */
 944         if (!base)
 945                 return (instance_list != 0);
 946         for (inst = instance_list; inst; inst = inst->next) {
 947                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
 948                         free(base);
 949                         return 1;
 950                 }
 951         }
 952         free(base);
 953         return 0;
 954 }
 955
 956 /* Check all file systems, using the /etc/fstab table. */
 957 static int check_all(NOARGS)
 958 {
 959         struct fs_info *fs = NULL;
 960         int status = EXIT_OK;
 961         int not_done_yet = 1;
 962         int passno = 1;
 963         int pass_done;
 964
 965         if (verbose)
 966                 fputs(_("Checking all file systems.\n"), stdout);
 967
 968         /*
 969          * Do an initial scan over the filesystem; mark filesystems
 970          * which should be ignored as done, and resolve any "auto"
 971          * filesystem types (done as a side-effect of calling ignore()).
 972          */
 973         for (fs = filesys_info; fs; fs = fs->next) {
 974                 if (ignore(fs))
 975                         fs->flags |= FLAG_DONE;
 976         }
 977
 978         /*
 979          * Find and check the root filesystem.
 980          */
 981         if (!parallel_root) {
 982                 for (fs = filesys_info; fs; fs = fs->next) {
 983                         if (!strcmp(fs->mountpt, "/"))
 984                                 break;
 985                 }
 986                 if (fs) {
 987                         if (!skip_root && !ignore(fs) &&
 988                             !(ignore_mounted && is_mounted(fs->device))) {
 989                                 fsck_device(fs, 1);
 990                                 status |= wait_many(FLAG_WAIT_ALL);
 991                                 if (status > EXIT_NONDESTRUCT)
 992                                         return status;
 993                         }
 994                         fs->flags |= FLAG_DONE;
 995                 }
 996         }
 997         /*
 998          * This is for the bone-headed user who enters the root
 999          * filesystem twice.  Skip root will skep all root entries.
1000          */
1001         if (skip_root)
1002                 for (fs = filesys_info; fs; fs = fs->next)
1003                         if (!strcmp(fs->mountpt, "/"))
1004                                 fs->flags |= FLAG_DONE;
1005
1006         while (not_done_yet) {
1007                 not_done_yet = 0;
1008                 pass_done = 1;
1009
1010                 for (fs = filesys_info; fs; fs = fs->next) {
1011                         if (cancel_requested)
1012                                 break;
1013                         if (fs->flags & FLAG_DONE)
1014                                 continue;
1015                         /*
1016                          * If the filesystem's pass number is higher
1017                          * than the current pass number, then we don't
1018                          * do it yet.
1019                          */
1020                         if (fs->passno > passno) {
1021                                 not_done_yet++;
1022                                 continue;
1023                         }
1024                         if (ignore_mounted && is_mounted(fs->device)) {
1025                                 fs->flags |= FLAG_DONE;
1026                                 continue;
1027                         }
1028                         /*
1029                          * If a filesystem on a particular device has
1030                          * already been spawned, then we need to defer
1031                          * this to another pass.
1032                          */
1033                         if (device_already_active(fs->device)) {
1034                                 pass_done = 0;
1035                                 continue;
1036                         }
1037                         /*
1038                          * Spawn off the fsck process
1039                          */
1040                         fsck_device(fs, serialize);
1041                         fs->flags |= FLAG_DONE;
1042
1043                         /*
1044                          * Only do one filesystem at a time, or if we
1045                          * have a limit on the number of fsck's extant
1046                          * at one time, apply that limit.
1047                          */
1048                         if (serialize ||
1049                             (max_running && (num_running >= max_running))) {
1050                                 pass_done = 0;
1051                                 break;
1052                         }
1053                 }
1054                 if (cancel_requested)
1055                         break;
1056                 if (verbose > 1)
1057                         printf(_("--waiting-- (pass %d)\n"), passno);
1058                 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1059                                     FLAG_WAIT_ATLEAST_ONE);
1060                 if (pass_done) {
1061                         if (verbose > 1)
1062                                 printf("----------------------------------\n");
1063                         passno++;
1064                 } else
1065                         not_done_yet++;
1066         }
1067         if (cancel_requested && !kill_sent) {
1068                 kill_all(SIGTERM);
1069                 kill_sent++;
1070         }
1071         status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1072         return status;
1073 }
1074
1075 static void usage(NOARGS)
1076 {
1077         fputs(_("Usage: fsck [-AMNPRTV] [ -C [ fd ] ] [-t fstype] [fs-options] [filesys ...]\n"), stderr);
1078         exit(EXIT_USAGE);
1079 }
1080
1081 #ifdef HAVE_SIGNAL_H
1082 static void signal_cancel(int sig FSCK_ATTR((unused)))
1083 {
1084         cancel_requested++;
1085 }
1086 #endif
1087
1088 static void PRS(int argc, char *argv[])
1089 {
1090         int     i, j;
1091         char    *arg, *dev, *tmp = 0;
1092         char    options[128];
1093         int     opt = 0;
1094         int     opts_for_fsck = 0;
1095 #ifdef HAVE_SIGNAL_H
1096         struct sigaction        sa;
1097
1098         /*
1099          * Set up signal action
1100          */
1101         memset(&sa, 0, sizeof(struct sigaction));
1102         sa.sa_handler = signal_cancel;
1103         sigaction(SIGINT, &sa, 0);
1104         sigaction(SIGTERM, &sa, 0);
1105 #endif
1106
1107         num_devices = 0;
1108         num_args = 0;
1109         instance_list = 0;
1110
1111         progname = argv[0];
1112
1113         for (i=1; i < argc; i++) {
1114                 arg = argv[i];
1115                 if (!arg)
1116                         continue;
1117                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1118                         if (num_devices >= MAX_DEVICES) {
1119                                 fprintf(stderr, _("%s: too many devices\n"),
1120                                         progname);
1121                                 exit(EXIT_ERROR);
1122                         }
1123                         dev = blkid_get_devname(cache, arg, NULL);
1124                         if (!dev && strchr(arg, '=')) {
1125                                 /*
1126                                  * Check to see if we failed because
1127                                  * /proc/partitions isn't found.
1128                                  */
1129                                 if (access("/proc/partitions", R_OK) < 0) {
1130                                         fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1131                                                 strerror(errno));
1132                                         fprintf(stderr, "Is /proc mounted?\n");
1133                                         exit(EXIT_ERROR);
1134                                 }
1135                                 /*
1136                                  * Check to see if this is because
1137                                  * we're not running as root
1138                                  */
1139                                 if (geteuid())
1140                                         fprintf(stderr,
1141                 "Must be root to scan for matching filesystems: %s\n", arg);
1142                                 else
1143                                         fprintf(stderr,
1144                 "Couldn't find matching filesystem: %s\n", arg);
1145                                 exit(EXIT_ERROR);
1146                         }
1147                         devices[num_devices++] = dev ? dev : string_copy(arg);
1148                         continue;
1149                 }
1150                 if (arg[0] != '-' || opts_for_fsck) {
1151                         if (num_args >= MAX_ARGS) {
1152                                 fprintf(stderr, _("%s: too many arguments\n"),
1153                                         progname);
1154                                 exit(EXIT_ERROR);
1155                         }
1156                         args[num_args++] = string_copy(arg);
1157                         continue;
1158                 }
1159                 for (j=1; arg[j]; j++) {
1160                         if (opts_for_fsck) {
1161                                 options[++opt] = arg[j];
1162                                 continue;
1163                         }
1164                         switch (arg[j]) {
1165                         case 'A':
1166                                 doall++;
1167                                 break;
1168                         case 'C':
1169                                 progress++;
1170                                 if (arg[j+1]) {
1171                                         progress_fd = string_to_int(arg+j+1);
1172                                         if (progress_fd < 0)
1173                                                 progress_fd = 0;
1174                                         else
1175                                                 goto next_arg;
1176                                 } else if ((i+1) < argc &&
1177                                            !strncmp(argv[i+1], "-", 1) == 0) {
1178                                         progress_fd = string_to_int(argv[i]);
1179                                         if (progress_fd < 0)
1180                                                 progress_fd = 0;
1181                                         else {
1182                                                 goto next_arg;
1183                                                 i++;
1184                                         }
1185                                 }
1186                                 break;
1187                         case 'V':
1188                                 verbose++;
1189                                 break;
1190                         case 'N':
1191                                 noexecute++;
1192                                 break;
1193                         case 'R':
1194                                 skip_root++;
1195                                 break;
1196                         case 'T':
1197                                 notitle++;
1198                                 break;
1199                         case 'M':
1200                                 ignore_mounted++;
1201                                 break;
1202                         case 'P':
1203                                 parallel_root++;
1204                                 break;
1205                         case 's':
1206                                 serialize++;
1207                                 break;
1208                         case 't':
1209                                 tmp = 0;
1210                                 if (fstype)
1211                                         usage();
1212                                 if (arg[j+1])
1213                                         tmp = arg+j+1;
1214                                 else if ((i+1) < argc)
1215                                         tmp = argv[++i];
1216                                 else
1217                                         usage();
1218                                 fstype = string_copy(tmp);
1219                                 compile_fs_type(fstype, &fs_type_compiled);
1220                                 goto next_arg;
1221                         case '-':
1222                                 opts_for_fsck++;
1223                                 break;
1224                         case '?':
1225                                 usage();
1226                                 break;
1227                         default:
1228                                 options[++opt] = arg[j];
1229                                 break;
1230                         }
1231                 }
1232         next_arg:
1233                 if (opt) {
1234                         options[0] = '-';
1235                         options[++opt] = '\0';
1236                         if (num_args >= MAX_ARGS) {
1237                                 fprintf(stderr,
1238                                         _("%s: too many arguments\n"),
1239                                         progname);
1240                                 exit(EXIT_ERROR);
1241                         }
1242                         args[num_args++] = string_copy(options);
1243                         opt = 0;
1244                 }
1245         }
1246         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1247                 force_all_parallel++;
1248         if ((tmp = getenv("FSCK_MAX_INST")))
1249             max_running = atoi(tmp);
1250 }
1251
1252 int main(int argc, char *argv[])
1253 {
1254         int i, status = 0;
1255         int interactive = 0;
1256         char *oldpath = getenv("PATH");
1257         const char *fstab;
1258         struct fs_info *fs;
1259
1260         setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1261         setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1262
1263 #ifdef ENABLE_NLS
1264         setlocale(LC_MESSAGES, "");
1265         setlocale(LC_CTYPE, "");
1266         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1267         textdomain(NLS_CAT_NAME);
1268 #endif
1269         blkid_get_cache(&cache, NULL);
1270         PRS(argc, argv);
1271
1272         if (!notitle)
1273                 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1274
1275         fstab = getenv("FSTAB_FILE");
1276         if (!fstab)
1277                 fstab = _PATH_MNTTAB;
1278         load_fs_info(fstab);
1279
1280         /* Update our search path to include uncommon directories. */
1281         if (oldpath) {
1282                 fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1283                                     strlen (oldpath) + 1);
1284                 if (!fsck_path) {
1285                         fprintf(stderr, "%s: Unable to allocate memory for fsck_path\n", progname);
1286                         exit(EXIT_ERROR);
1287                 }
1288                 strcpy (fsck_path, fsck_prefix_path);
1289                 strcat (fsck_path, ":");
1290                 strcat (fsck_path, oldpath);
1291         } else {
1292                 fsck_path = string_copy(fsck_prefix_path);
1293         }
1294
1295         if ((num_devices == 1) || (serialize))
1296                 interactive = 1;
1297
1298         /* If -A was specified ("check all"), do that! */
1299         if (doall)
1300                 return check_all();
1301
1302         if (num_devices == 0) {
1303                 serialize++;
1304                 interactive++;
1305                 return check_all();
1306         }
1307         for (i = 0 ; i < num_devices; i++) {
1308                 if (cancel_requested) {
1309                         if (!kill_sent) {
1310                                 kill_all(SIGTERM);
1311                                 kill_sent++;
1312                         }
1313                         break;
1314                 }
1315                 fs = lookup(devices[i]);
1316                 if (!fs) {
1317                         fs = create_fs_device(devices[i], 0, "auto",
1318                                               0, -1, -1);
1319                         if (!fs)
1320                                 continue;
1321                 }
1322                 if (ignore_mounted && is_mounted(fs->device))
1323                         continue;
1324                 fsck_device(fs, interactive);
1325                 if (serialize ||
1326                     (max_running && (num_running >= max_running))) {
1327                         struct fsck_instance *inst;
1328
1329                         inst = wait_one(0);
1330                         if (inst) {
1331                                 status |= inst->exit_status;
1332                                 free_instance(inst);
1333                         }
1334                         if (verbose > 1)
1335                                 printf("----------------------------------\n");
1336                 }
1337         }
1338         status |= wait_many(FLAG_WAIT_ALL);
1339         free(fsck_path);
1340         blkid_put_cache(cache);
1341         return status;
1342 }