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 "config.h"
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <sys/signal.h>
  34 #include <sys/stat.h>
  35 #include <limits.h>
  36 #include <stdio.h>
  37 #include <ctype.h>
  38 #include <string.h>
  39 #include <time.h>
  40 #if HAVE_STDLIB_H
  41 #include <stdlib.h>
  42 #endif
  43 #if HAVE_ERRNO_H
  44 #include <errno.h>
  45 #endif
  46 #if HAVE_PATHS_H
  47 #include <paths.h>
  48 #endif
  49 #if HAVE_UNISTD_H
  50 #include <unistd.h>
  51 #endif
  52 #if HAVE_ERRNO_H
  53 #include <errno.h>
  54 #endif
  55 #if HAVE_MALLOC_H
  56 #include <malloc.h>
  57 #endif
  58 #ifdef HAVE_SIGNAL_H
  59 #include <signal.h>
  60 #endif
  61
  62 #include "../version.h"
  63 #include "nls-enable.h"
  64 #include "fsck.h"
  65 #include "blkid/blkid.h"
  66
  67 #ifndef _PATH_MNTTAB
  68 #define _PATH_MNTTAB    "/etc/fstab"
  69 #endif
  70
  71 static const char *ignored_types[] = {
  72         "ignore",
  73         "iso9660",
  74         "nfs",
  75         "proc",
  76         "sw",
  77         "swap",
  78         "tmpfs",
  79         "devpts",
  80         NULL
  81 };
  82
  83 static const char *really_wanted[] = {
  84         "minix",
  85         "ext2",
  86         "ext3",
  87         "ext4",
  88         "ext4dev",
  89         "jfs",
  90         "reiserfs",
  91         "xiafs",
  92         "xfs",
  93         NULL
  94 };
  95
  96 #define BASE_MD "/dev/md"
  97
  98 /*
  99  * Global variables for options
 100  */
 101 char *devices[MAX_DEVICES];
 102 char *args[MAX_ARGS];
 103 int num_devices, num_args;
 104
 105 int verbose = 0;
 106 int doall = 0;
 107 int noexecute = 0;
 108 int serialize = 0;
 109 int skip_root = 0;
 110 int ignore_mounted = 0;
 111 int notitle = 0;
 112 int parallel_root = 0;
 113 int progress = 0;
 114 int progress_fd = 0;
 115 int force_all_parallel = 0;
 116 int num_running = 0;
 117 int max_running = 0;
 118 volatile int cancel_requested = 0;
 119 int kill_sent = 0;
 120 char *progname;
 121 char *fstype = NULL;
 122 struct fs_info *filesys_info = NULL, *filesys_last = NULL;
 123 struct fsck_instance *instance_list;
 124 const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
 125 char *fsck_path = 0;
 126 blkid_cache cache = NULL;
 127
 128 static char *string_copy(const char *s)
 129 {
 130         char    *ret;
 131
 132         if (!s)
 133                 return 0;
 134         ret = malloc(strlen(s)+1);
 135         if (ret)
 136                 strcpy(ret, s);
 137         return ret;
 138 }
 139
 140 static int string_to_int(const char *s)
 141 {
 142         long l;
 143         char *p;
 144
 145         l = strtol(s, &p, 0);
 146         if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
 147                 return -1;
 148         else
 149                 return (int) l;
 150 }
 151
 152 static int ignore(struct fs_info *);
 153
 154 static char *skip_over_blank(char *cp)
 155 {
 156         while (*cp && isspace(*cp))
 157                 cp++;
 158         return cp;
 159 }
 160
 161 static char *skip_over_word(char *cp)
 162 {
 163         while (*cp && !isspace(*cp))
 164                 cp++;
 165         return cp;
 166 }
 167
 168 static void strip_line(char *line)
 169 {
 170         char    *p;
 171
 172         while (*line) {
 173                 p = line + strlen(line) - 1;
 174                 if ((*p == '\n') || (*p == '\r'))
 175                         *p = 0;
 176                 else
 177                         break;
 178         }
 179 }
 180
 181 static char *parse_word(char **buf)
 182 {
 183         char *word, *next;
 184
 185         word = *buf;
 186         if (*word == 0)
 187                 return 0;
 188
 189         word = skip_over_blank(word);
 190         next = skip_over_word(word);
 191         if (*next)
 192                 *next++ = 0;
 193         *buf = next;
 194         return word;
 195 }
 196
 197 static void parse_escape(char *word)
 198 {
 199         char    *p, *q;
 200         int     ac, i;
 201
 202         if (!word)
 203                 return;
 204
 205         for (p = word, q = word; *p; p++, q++) {
 206                 *q = *p;
 207                 if (*p != '\\')
 208                         continue;
 209                 if (*++p == 0)
 210                         break;
 211                 if (*p == 't') {
 212                         *q = '\t';
 213                         continue;
 214                 }
 215                 if (*p == 'n') {
 216                         *q = '\n';
 217                         continue;
 218                 }
 219                 if (!isdigit(*p)) {
 220                         *q = *p;
 221                         continue;
 222                 }
 223                 ac = 0;
 224                 for (i = 0; i < 3; i++, p++) {
 225                         if (!isdigit(*p))
 226                                 break;
 227                         ac = (ac * 8) + (*p - '0');
 228                 }
 229                 *q = ac;
 230                 p--;
 231         }
 232         *q = 0;
 233 }
 234
 235 static void free_instance(struct fsck_instance *i)
 236 {
 237         free(i->prog);
 238         free(i->device);
 239         free(i->base_device);
 240         free(i);
 241         return;
 242 }
 243
 244 static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
 245                                         const char *type, const char *opts,
 246                                         int freq, int passno)
 247 {
 248         struct fs_info *fs;
 249
 250         if (!(fs = malloc(sizeof(struct fs_info))))
 251                 return NULL;
 252
 253         fs->device = string_copy(device);
 254         fs->mountpt = string_copy(mntpnt);
 255         fs->type = string_copy(type);
 256         fs->opts = string_copy(opts ? opts : "");
 257         fs->freq = freq;
 258         fs->passno = passno;
 259         fs->flags = 0;
 260         fs->next = NULL;
 261
 262         if (!filesys_info)
 263                 filesys_info = fs;
 264         else
 265                 filesys_last->next = fs;
 266         filesys_last = fs;
 267
 268         return fs;
 269 }
 270
 271
 272
 273 static int parse_fstab_line(char *line, struct fs_info **ret_fs)
 274 {
 275         char    *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
 276         struct fs_info *fs;
 277
 278         *ret_fs = 0;
 279         strip_line(line);
 280         cp = line;
 281
 282         device = parse_word(&cp);
 283         if (!device || *device == '#')
 284                 return 0;       /* Ignore blank lines and comments */
 285         mntpnt = parse_word(&cp);
 286         type = parse_word(&cp);
 287         opts = parse_word(&cp);
 288         freq = parse_word(&cp);
 289         passno = parse_word(&cp);
 290
 291         if (!mntpnt || !type)
 292                 return -1;
 293
 294         parse_escape(device);
 295         parse_escape(mntpnt);
 296         parse_escape(type);
 297         parse_escape(opts);
 298         parse_escape(freq);
 299         parse_escape(passno);
 300
 301         dev = blkid_get_devname(cache, device, NULL);
 302         if (dev)
 303                 device = dev;
 304
 305         if (strchr(type, ','))
 306                 type = 0;
 307
 308         fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
 309                               freq ? atoi(freq) : -1,
 310                               passno ? atoi(passno) : -1);
 311         free(dev);
 312
 313         if (!fs)
 314                 return -1;
 315         *ret_fs = fs;
 316         return 0;
 317 }
 318
 319 static void interpret_type(struct fs_info *fs)
 320 {
 321         char    *t;
 322
 323         if (strcmp(fs->type, "auto") != 0)
 324                 return;
 325         t = blkid_get_tag_value(cache, "TYPE", fs->device);
 326         if (t) {
 327                 free(fs->type);
 328                 fs->type = t;
 329         }
 330 }
 331
 332 /*
 333  * Load the filesystem database from /etc/fstab
 334  */
 335 static void load_fs_info(const char *filename)
 336 {
 337         FILE    *f;
 338         char    buf[1024];
 339         int     lineno = 0;
 340         int     old_fstab = 1;
 341         struct fs_info *fs;
 342
 343         if ((f = fopen(filename, "r")) == NULL) {
 344                 fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
 345                         filename, strerror(errno));
 346                 return;
 347         }
 348         while (!feof(f)) {
 349                 lineno++;
 350                 if (!fgets(buf, sizeof(buf), f))
 351                         break;
 352                 buf[sizeof(buf)-1] = 0;
 353                 if (parse_fstab_line(buf, &fs) < 0) {
 354                         fprintf(stderr, _("WARNING: bad format "
 355                                 "on line %d of %s\n"), lineno, filename);
 356                         continue;
 357                 }
 358                 if (!fs)
 359                         continue;
 360                 if (fs->passno < 0)
 361                         fs->passno = 0;
 362                 else
 363                         old_fstab = 0;
 364         }
 365
 366         fclose(f);
 367
 368         if (old_fstab && filesys_info) {
 369                 fputs("\007\007\007", stderr);
 370                 fputs(_(
 371                 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
 372                 "       field.  I will kludge around things for you, but you\n"
 373                 "       should fix your /etc/fstab file as soon as you can.\n\n"), stderr);
 374
 375                 for (fs = filesys_info; fs; fs = fs->next) {
 376                         fs->passno = 1;
 377                 }
 378         }
 379 }
 380
 381 /* Lookup filesys in /etc/fstab and return the corresponding entry. */
 382 static struct fs_info *lookup(char *filesys)
 383 {
 384         struct fs_info *fs;
 385
 386         /* No filesys name given. */
 387         if (filesys == NULL)
 388                 return NULL;
 389
 390         for (fs = filesys_info; fs; fs = fs->next) {
 391                 if (!strcmp(filesys, fs->device) ||
 392                     (fs->mountpt && !strcmp(filesys, fs->mountpt)))
 393                         break;
 394         }
 395
 396         return fs;
 397 }
 398
 399 /* Find fsck program for a given fs type. */
 400 static char *find_fsck(char *type)
 401 {
 402   char *s;
 403   const char *tpl;
 404   static char prog[256];
 405   char *p = string_copy(fsck_path);
 406   struct stat st;
 407
 408   /* Are we looking for a program or just a type? */
 409   tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
 410
 411   for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
 412         sprintf(prog, tpl, s, type);
 413         if (stat(prog, &st) == 0) break;
 414   }
 415   free(p);
 416   return(s ? prog : NULL);
 417 }
 418
 419 static int progress_active(NOARGS)
 420 {
 421         struct fsck_instance *inst;
 422
 423         for (inst = instance_list; inst; inst = inst->next) {
 424                 if (inst->flags & FLAG_DONE)
 425                         continue;
 426                 if (inst->flags & FLAG_PROGRESS)
 427                         return 1;
 428         }
 429         return 0;
 430 }
 431
 432 /*
 433  * Execute a particular fsck program, and link it into the list of
 434  * child processes we are waiting for.
 435  */
 436 static int execute(const char *type, const char *device, const char *mntpt,
 437                    int interactive)
 438 {
 439         char *s, *argv[80], prog[80];
 440         int  argc, i;
 441         struct fsck_instance *inst, *p;
 442         pid_t   pid;
 443
 444         inst = malloc(sizeof(struct fsck_instance));
 445         if (!inst)
 446                 return ENOMEM;
 447         memset(inst, 0, sizeof(struct fsck_instance));
 448
 449         sprintf(prog, "fsck.%s", type);
 450         argv[0] = string_copy(prog);
 451         argc = 1;
 452
 453         for (i=0; i <num_args; i++)
 454                 argv[argc++] = string_copy(args[i]);
 455
 456         if (progress) {
 457                 if ((strcmp(type, "ext2") == 0) ||
 458                     (strcmp(type, "ext3") == 0) ||
 459                     (strcmp(type, "ext4") == 0) ||
 460                     (strcmp(type, "ext4dev") == 0)) {
 461                         char tmp[80];
 462
 463                         tmp[0] = 0;
 464                         if (!progress_active()) {
 465                                 snprintf(tmp, 80, "-C%d", progress_fd);
 466                                 inst->flags |= FLAG_PROGRESS;
 467                         } else if (progress_fd)
 468                                 snprintf(tmp, 80, "-C%d", progress_fd * -1);
 469                         if (tmp[0])
 470                                 argv[argc++] = string_copy(tmp);
 471                 }
 472         }
 473
 474         argv[argc++] = string_copy(device);
 475         argv[argc] = 0;
 476
 477         s = find_fsck(prog);
 478         if (s == NULL) {
 479                 fprintf(stderr, _("fsck: %s: not found\n"), prog);
 480                 free(inst);
 481                 return ENOENT;
 482         }
 483
 484         if (verbose || noexecute) {
 485                 printf("[%s (%d) -- %s] ", s, num_running,
 486                        mntpt ? mntpt : device);
 487                 for (i=0; i < argc; i++)
 488                         printf("%s ", argv[i]);
 489                 printf("\n");
 490         }
 491
 492         /* Fork and execute the correct program. */
 493         if (noexecute)
 494                 pid = -1;
 495         else if ((pid = fork()) < 0) {
 496                 perror("fork");
 497                 free(inst);
 498                 return errno;
 499         } else if (pid == 0) {
 500                 if (!interactive)
 501                         close(0);
 502                 (void) execv(s, argv);
 503                 perror(argv[0]);
 504                 free(inst);
 505                 exit(EXIT_ERROR);
 506         }
 507
 508         for (i=0; i < argc; i++)
 509                 free(argv[i]);
 510
 511         inst->pid = pid;
 512         inst->prog = string_copy(prog);
 513         inst->type = string_copy(type);
 514         inst->device = string_copy(device);
 515         inst->base_device = base_device(device);
 516         inst->start_time = time(0);
 517         inst->next = NULL;
 518
 519         /*
 520          * Find the end of the list, so we add the instance on at the end.
 521          */
 522         for (p = instance_list; p && p->next; p = p->next);
 523
 524         if (p)
 525                 p->next = inst;
 526         else
 527                 instance_list = inst;
 528
 529         return 0;
 530 }
 531
 532 /*
 533  * Send a signal to all outstanding fsck child processes
 534  */
 535 static int kill_all(int signum)
 536 {
 537         struct fsck_instance *inst;
 538         int     n = 0;
 539
 540         for (inst = instance_list; inst; inst = inst->next) {
 541                 if (inst->flags & FLAG_DONE)
 542                         continue;
 543                 kill(inst->pid, signum);
 544                 n++;
 545         }
 546         return n;
 547 }
 548
 549 /*
 550  * Wait for one child process to exit; when it does, unlink it from
 551  * the list of executing child processes, and return it.
 552  */
 553 static struct fsck_instance *wait_one(int flags)
 554 {
 555         int     status;
 556         int     sig;
 557         struct fsck_instance *inst, *inst2, *prev;
 558         pid_t   pid;
 559
 560         if (!instance_list)
 561                 return NULL;
 562
 563         if (noexecute) {
 564                 inst = instance_list;
 565                 prev = 0;
 566 #ifdef RANDOM_DEBUG
 567                 while (inst->next && (random() & 1)) {
 568                         prev = inst;
 569                         inst = inst->next;
 570                 }
 571 #endif
 572                 inst->exit_status = 0;
 573                 goto ret_inst;
 574         }
 575
 576         /*
 577          * gcc -Wall fails saving throw against stupidity
 578          * (inst and prev are thought to be uninitialized variables)
 579          */
 580         inst = prev = NULL;
 581
 582         do {
 583                 pid = waitpid(-1, &status, flags);
 584                 if (cancel_requested && !kill_sent) {
 585                         kill_all(SIGTERM);
 586                         kill_sent++;
 587                 }
 588                 if ((pid == 0) && (flags & WNOHANG))
 589                         return NULL;
 590                 if (pid < 0) {
 591                         if ((errno == EINTR) || (errno == EAGAIN))
 592                                 continue;
 593                         if (errno == ECHILD) {
 594                                 fprintf(stderr,
 595                                         _("%s: wait: No more child process?!?\n"),
 596                                         progname);
 597                                 return NULL;
 598                         }
 599                         perror("wait");
 600                         continue;
 601                 }
 602                 for (prev = 0, inst = instance_list;
 603                      inst;
 604                      prev = inst, inst = inst->next) {
 605                         if (inst->pid == pid)
 606                                 break;
 607                 }
 608         } while (!inst);
 609
 610         if (WIFEXITED(status))
 611                 status = WEXITSTATUS(status);
 612         else if (WIFSIGNALED(status)) {
 613                 sig = WTERMSIG(status);
 614                 if (sig == SIGINT) {
 615                         status = EXIT_UNCORRECTED;
 616                 } else {
 617                         printf(_("Warning... %s for device %s exited "
 618                                "with signal %d.\n"),
 619                                inst->prog, inst->device, sig);
 620                         status = EXIT_ERROR;
 621                 }
 622         } else {
 623                 printf(_("%s %s: status is %x, should never happen.\n"),
 624                        inst->prog, inst->device, status);
 625                 status = EXIT_ERROR;
 626         }
 627         inst->exit_status = status;
 628         inst->flags |= FLAG_DONE;
 629         if (progress && (inst->flags & FLAG_PROGRESS) &&
 630             !progress_active()) {
 631                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 632                         if (inst2->flags & FLAG_DONE)
 633                                 continue;
 634                         if (strcmp(inst2->type, "ext2") &&
 635                             strcmp(inst2->type, "ext3") &&
 636                             strcmp(inst2->type, "ext4") &&
 637                             strcmp(inst2->type, "ext4dev"))
 638                                 continue;
 639                         /*
 640                          * If we've just started the fsck, wait a tiny
 641                          * bit before sending the kill, to give it
 642                          * time to set up the signal handler
 643                          */
 644                         if (inst2->start_time < time(0)+2) {
 645                                 if (fork() == 0) {
 646                                         sleep(1);
 647                                         kill(inst2->pid, SIGUSR1);
 648                                         exit(0);
 649                                 }
 650                         } else
 651                                 kill(inst2->pid, SIGUSR1);
 652                         inst2->flags |= FLAG_PROGRESS;
 653                         break;
 654                 }
 655         }
 656 ret_inst:
 657         if (prev)
 658                 prev->next = inst->next;
 659         else
 660                 instance_list = inst->next;
 661         if (verbose > 1)
 662                 printf(_("Finished with %s (exit status %d)\n"),
 663                        inst->device, inst->exit_status);
 664         num_running--;
 665         return inst;
 666 }
 667
 668 #define FLAG_WAIT_ALL           0
 669 #define FLAG_WAIT_ATLEAST_ONE   1
 670 /*
 671  * Wait until all executing child processes have exited; return the
 672  * logical OR of all of their exit code values.
 673  */
 674 static int wait_many(int flags)
 675 {
 676         struct fsck_instance *inst;
 677         int     global_status = 0;
 678         int     wait_flags = 0;
 679
 680         while ((inst = wait_one(wait_flags))) {
 681                 global_status |= inst->exit_status;
 682                 free_instance(inst);
 683 #ifdef RANDOM_DEBUG
 684                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 685                         break;
 686 #endif
 687                 if (flags & FLAG_WAIT_ATLEAST_ONE)
 688                         wait_flags = WNOHANG;
 689         }
 690         return global_status;
 691 }
 692
 693 /*
 694  * Run the fsck program on a particular device
 695  *
 696  * If the type is specified using -t, and it isn't prefixed with "no"
 697  * (as in "noext2") and only one filesystem type is specified, then
 698  * use that type regardless of what is specified in /etc/fstab.
 699  *
 700  * If the type isn't specified by the user, then use either the type
 701  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 702  */
 703 static void fsck_device(struct fs_info *fs, int interactive)
 704 {
 705         const char *type;
 706         int retval;
 707
 708         interpret_type(fs);
 709
 710         if (strcmp(fs->type, "auto") != 0)
 711                 type = fs->type;
 712         else if (fstype && strncmp(fstype, "no", 2) &&
 713             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 714             !strchr(fstype, ','))
 715                 type = fstype;
 716         else
 717                 type = DEFAULT_FSTYPE;
 718
 719         num_running++;
 720         retval = execute(type, fs->device, fs->mountpt, interactive);
 721         if (retval) {
 722                 fprintf(stderr, _("%s: Error %d while executing fsck.%s "
 723                         "for %s\n"), progname, retval, type, fs->device);
 724                 num_running--;
 725         }
 726 }
 727
 728
 729 /*
 730  * Deal with the fsck -t argument.
 731  */
 732 struct fs_type_compile {
 733         char **list;
 734         int *type;
 735         int  negate;
 736 } fs_type_compiled;
 737
 738 #define FS_TYPE_NORMAL  0
 739 #define FS_TYPE_OPT     1
 740 #define FS_TYPE_NEGOPT  2
 741
 742 static const char *fs_type_syntax_error =
 743 N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
 744    "with 'no' or '!'.\n");
 745
 746 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 747 {
 748         char    *cp, *list, *s;
 749         int     num = 2;
 750         int     negate, first_negate = 1;
 751
 752         if (fs_type) {
 753                 for (cp=fs_type; *cp; cp++) {
 754                         if (*cp == ',')
 755                                 num++;
 756                 }
 757         }
 758
 759         cmp->list = malloc(num * sizeof(char *));
 760         cmp->type = malloc(num * sizeof(int));
 761         if (!cmp->list || !cmp->type) {
 762                 fputs(_("Couldn't allocate memory for filesystem types\n"),
 763                       stderr);
 764                 exit(EXIT_ERROR);
 765         }
 766         memset(cmp->list, 0, num * sizeof(char *));
 767         memset(cmp->type, 0, num * sizeof(int));
 768         cmp->negate = 0;
 769
 770         if (!fs_type)
 771                 return;
 772
 773         list = string_copy(fs_type);
 774         num = 0;
 775         s = strtok(list, ",");
 776         while(s) {
 777                 negate = 0;
 778                 if (strncmp(s, "no", 2) == 0) {
 779                         s += 2;
 780                         negate = 1;
 781                 } else if (*s == '!') {
 782                         s++;
 783                         negate = 1;
 784                 }
 785                 if (strcmp(s, "loop") == 0)
 786                         /* loop is really short-hand for opts=loop */
 787                         goto loop_special_case;
 788                 else if (strncmp(s, "opts=", 5) == 0) {
 789                         s += 5;
 790                 loop_special_case:
 791                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 792                 } else {
 793                         if (first_negate) {
 794                                 cmp->negate = negate;
 795                                 first_negate = 0;
 796                         }
 797                         if ((negate && !cmp->negate) ||
 798                             (!negate && cmp->negate)) {
 799                                 fputs(_(fs_type_syntax_error), stderr);
 800                                 exit(EXIT_USAGE);
 801                         }
 802                 }
 803 #if 0
 804                 printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
 805 #endif
 806                 cmp->list[num++] = string_copy(s);
 807                 s = strtok(NULL, ",");
 808         }
 809         free(list);
 810 }
 811
 812 /*
 813  * This function returns true if a particular option appears in a
 814  * comma-delimited options list
 815  */
 816 static int opt_in_list(const char *opt, char *optlist)
 817 {
 818         char    *list, *s;
 819
 820         if (!optlist)
 821                 return 0;
 822         list = string_copy(optlist);
 823
 824         s = strtok(list, ",");
 825         while(s) {
 826                 if (strcmp(s, opt) == 0) {
 827                         free(list);
 828                         return 1;
 829                 }
 830                 s = strtok(NULL, ",");
 831         }
 832         free(list);
 833         return 0;
 834 }
 835
 836 /* See if the filesystem matches the criteria given by the -t option */
 837 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 838 {
 839         int n, ret = 0, checked_type = 0;
 840         char *cp;
 841
 842         if (cmp->list == 0 || cmp->list[0] == 0)
 843                 return 1;
 844
 845         for (n=0; (cp = cmp->list[n]); n++) {
 846                 switch (cmp->type[n]) {
 847                 case FS_TYPE_NORMAL:
 848                         checked_type++;
 849                         if (strcmp(cp, fs->type) == 0) {
 850                                 ret = 1;
 851                         }
 852                         break;
 853                 case FS_TYPE_NEGOPT:
 854                         if (opt_in_list(cp, fs->opts))
 855                                 return 0;
 856                         break;
 857                 case FS_TYPE_OPT:
 858                         if (!opt_in_list(cp, fs->opts))
 859                                 return 0;
 860                         break;
 861                 }
 862         }
 863         if (checked_type == 0)
 864                 return 1;
 865         return (cmp->negate ? !ret : ret);
 866 }
 867
 868 /* Check if we should ignore this filesystem. */
 869 static int ignore(struct fs_info *fs)
 870 {
 871         const char **ip;
 872         int wanted = 0;
 873
 874         /*
 875          * If the pass number is 0, ignore it.
 876          */
 877         if (fs->passno == 0)
 878                 return 1;
 879
 880         /*
 881          * If this is a bind mount, ignore it.
 882          */
 883         if (opt_in_list("bind", fs->opts)) {
 884                 fprintf(stderr,
 885                         _("%s: skipping bad line in /etc/fstab: bind mount with nonzero fsck pass number\n"),
 886                         fs->mountpt);
 887                 return 1;
 888         }
 889
 890         interpret_type(fs);
 891
 892         /*
 893          * If a specific fstype is specified, and it doesn't match,
 894          * ignore it.
 895          */
 896         if (!fs_match(fs, &fs_type_compiled)) return 1;
 897
 898         /* Are we ignoring this type? */
 899         for(ip = ignored_types; *ip; ip++)
 900                 if (strcmp(fs->type, *ip) == 0) return 1;
 901
 902         /* Do we really really want to check this fs? */
 903         for(ip = really_wanted; *ip; ip++)
 904                 if (strcmp(fs->type, *ip) == 0) {
 905                         wanted = 1;
 906                         break;
 907                 }
 908
 909         /* See if the <fsck.fs> program is available. */
 910         if (find_fsck(fs->type) == NULL) {
 911                 if (wanted)
 912                         fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
 913                                 fs->device, fs->type);
 914                 return 1;
 915         }
 916
 917         /* We can and want to check this file system type. */
 918         return 0;
 919 }
 920
 921 /*
 922  * Returns TRUE if a partition on the same disk is already being
 923  * checked.
 924  */
 925 static int device_already_active(char *device)
 926 {
 927         struct fsck_instance *inst;
 928         char *base;
 929
 930         if (force_all_parallel)
 931                 return 0;
 932
 933 #ifdef BASE_MD
 934         /* Don't check a soft raid disk with any other disk */
 935         if (instance_list &&
 936             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
 937              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
 938                 return 1;
 939 #endif
 940
 941         base = base_device(device);
 942         /*
 943          * If we don't know the base device, assume that the device is
 944          * already active if there are any fsck instances running.
 945          */
 946         if (!base)
 947                 return (instance_list != 0);
 948         for (inst = instance_list; inst; inst = inst->next) {
 949                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
 950                         free(base);
 951                         return 1;
 952                 }
 953         }
 954         free(base);
 955         return 0;
 956 }
 957
 958 /* Check all file systems, using the /etc/fstab table. */
 959 static int check_all(NOARGS)
 960 {
 961         struct fs_info *fs = NULL;
 962         int status = EXIT_OK;
 963         int not_done_yet = 1;
 964         int passno = 1;
 965         int pass_done;
 966
 967         if (verbose)
 968                 fputs(_("Checking all file systems.\n"), stdout);
 969
 970         /*
 971          * Do an initial scan over the filesystem; mark filesystems
 972          * which should be ignored as done, and resolve any "auto"
 973          * filesystem types (done as a side-effect of calling ignore()).
 974          */
 975         for (fs = filesys_info; fs; fs = fs->next) {
 976                 if (ignore(fs))
 977                         fs->flags |= FLAG_DONE;
 978         }
 979
 980         /*
 981          * Find and check the root filesystem.
 982          */
 983         if (!parallel_root) {
 984                 for (fs = filesys_info; fs; fs = fs->next) {
 985                         if (!strcmp(fs->mountpt, "/"))
 986                                 break;
 987                 }
 988                 if (fs) {
 989                         if (!skip_root && !ignore(fs) &&
 990                             !(ignore_mounted && is_mounted(fs->device))) {
 991                                 fsck_device(fs, 1);
 992                                 status |= wait_many(FLAG_WAIT_ALL);
 993                                 if (status > EXIT_NONDESTRUCT)
 994                                         return status;
 995                         }
 996                         fs->flags |= FLAG_DONE;
 997                 }
 998         }
 999         /*
1000          * This is for the bone-headed user who enters the root
1001          * filesystem twice.  Skip root will skep all root entries.
1002          */
1003         if (skip_root)
1004                 for (fs = filesys_info; fs; fs = fs->next)
1005                         if (!strcmp(fs->mountpt, "/"))
1006                                 fs->flags |= FLAG_DONE;
1007
1008         while (not_done_yet) {
1009                 not_done_yet = 0;
1010                 pass_done = 1;
1011
1012                 for (fs = filesys_info; fs; fs = fs->next) {
1013                         if (cancel_requested)
1014                                 break;
1015                         if (fs->flags & FLAG_DONE)
1016                                 continue;
1017                         /*
1018                          * If the filesystem's pass number is higher
1019                          * than the current pass number, then we don't
1020                          * do it yet.
1021                          */
1022                         if (fs->passno > passno) {
1023                                 not_done_yet++;
1024                                 continue;
1025                         }
1026                         if (ignore_mounted && is_mounted(fs->device)) {
1027                                 fs->flags |= FLAG_DONE;
1028                                 continue;
1029                         }
1030                         /*
1031                          * If a filesystem on a particular device has
1032                          * already been spawned, then we need to defer
1033                          * this to another pass.
1034                          */
1035                         if (device_already_active(fs->device)) {
1036                                 pass_done = 0;
1037                                 continue;
1038                         }
1039                         /*
1040                          * Spawn off the fsck process
1041                          */
1042                         fsck_device(fs, serialize);
1043                         fs->flags |= FLAG_DONE;
1044
1045                         /*
1046                          * Only do one filesystem at a time, or if we
1047                          * have a limit on the number of fsck's extant
1048                          * at one time, apply that limit.
1049                          */
1050                         if (serialize ||
1051                             (max_running && (num_running >= max_running))) {
1052                                 pass_done = 0;
1053                                 break;
1054                         }
1055                 }
1056                 if (cancel_requested)
1057                         break;
1058                 if (verbose > 1)
1059                         printf(_("--waiting-- (pass %d)\n"), passno);
1060                 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1061                                     FLAG_WAIT_ATLEAST_ONE);
1062                 if (pass_done) {
1063                         if (verbose > 1)
1064                                 printf("----------------------------------\n");
1065                         passno++;
1066                 } else
1067                         not_done_yet++;
1068         }
1069         if (cancel_requested && !kill_sent) {
1070                 kill_all(SIGTERM);
1071                 kill_sent++;
1072         }
1073         status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1074         return status;
1075 }
1076
1077 static void usage(NOARGS)
1078 {
1079         fputs(_("Usage: fsck [-AMNPRTV] [ -C [ fd ] ] [-t fstype] [fs-options] [filesys ...]\n"), stderr);
1080         exit(EXIT_USAGE);
1081 }
1082
1083 #ifdef HAVE_SIGNAL_H
1084 static void signal_cancel(int sig FSCK_ATTR((unused)))
1085 {
1086         cancel_requested++;
1087 }
1088 #endif
1089
1090 static void PRS(int argc, char *argv[])
1091 {
1092         int     i, j;
1093         char    *arg, *dev, *tmp = 0;
1094         char    options[128];
1095         int     opt = 0;
1096         int     opts_for_fsck = 0;
1097 #ifdef HAVE_SIGNAL_H
1098         struct sigaction        sa;
1099
1100         /*
1101          * Set up signal action
1102          */
1103         memset(&sa, 0, sizeof(struct sigaction));
1104         sa.sa_handler = signal_cancel;
1105         sigaction(SIGINT, &sa, 0);
1106         sigaction(SIGTERM, &sa, 0);
1107 #endif
1108
1109         num_devices = 0;
1110         num_args = 0;
1111         instance_list = 0;
1112
1113         progname = argv[0];
1114
1115         for (i=1; i < argc; i++) {
1116                 arg = argv[i];
1117                 if (!arg)
1118                         continue;
1119                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1120                         if (num_devices >= MAX_DEVICES) {
1121                                 fprintf(stderr, _("%s: too many devices\n"),
1122                                         progname);
1123                                 exit(EXIT_ERROR);
1124                         }
1125                         dev = blkid_get_devname(cache, arg, NULL);
1126                         if (!dev && strchr(arg, '=')) {
1127                                 /*
1128                                  * Check to see if we failed because
1129                                  * /proc/partitions isn't found.
1130                                  */
1131                                 if (access("/proc/partitions", R_OK) < 0) {
1132                                         fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1133                                                 strerror(errno));
1134                                         fprintf(stderr, "Is /proc mounted?\n");
1135                                         exit(EXIT_ERROR);
1136                                 }
1137                                 /*
1138                                  * Check to see if this is because
1139                                  * we're not running as root
1140                                  */
1141                                 if (geteuid())
1142                                         fprintf(stderr,
1143                 "Must be root to scan for matching filesystems: %s\n", arg);
1144                                 else
1145                                         fprintf(stderr,
1146                 "Couldn't find matching filesystem: %s\n", arg);
1147                                 exit(EXIT_ERROR);
1148                         }
1149                         devices[num_devices++] = dev ? dev : string_copy(arg);
1150                         continue;
1151                 }
1152                 if (arg[0] != '-' || opts_for_fsck) {
1153                         if (num_args >= MAX_ARGS) {
1154                                 fprintf(stderr, _("%s: too many arguments\n"),
1155                                         progname);
1156                                 exit(EXIT_ERROR);
1157                         }
1158                         args[num_args++] = string_copy(arg);
1159                         continue;
1160                 }
1161                 for (j=1; arg[j]; j++) {
1162                         if (opts_for_fsck) {
1163                                 options[++opt] = arg[j];
1164                                 continue;
1165                         }
1166                         switch (arg[j]) {
1167                         case 'A':
1168                                 doall++;
1169                                 break;
1170                         case 'C':
1171                                 progress++;
1172                                 if (arg[j+1]) {
1173                                         progress_fd = string_to_int(arg+j+1);
1174                                         if (progress_fd < 0)
1175                                                 progress_fd = 0;
1176                                         else
1177                                                 goto next_arg;
1178                                 } else if ((i+1) < argc &&
1179                                            !strncmp(argv[i+1], "-", 1) == 0) {
1180                                         progress_fd = string_to_int(argv[i]);
1181                                         if (progress_fd < 0)
1182                                                 progress_fd = 0;
1183                                         else {
1184                                                 ++i;
1185                                                 goto next_arg;
1186                                         }
1187                                 }
1188                                 break;
1189                         case 'V':
1190                                 verbose++;
1191                                 break;
1192                         case 'N':
1193                                 noexecute++;
1194                                 break;
1195                         case 'R':
1196                                 skip_root++;
1197                                 break;
1198                         case 'T':
1199                                 notitle++;
1200                                 break;
1201                         case 'M':
1202                                 ignore_mounted++;
1203                                 break;
1204                         case 'P':
1205                                 parallel_root++;
1206                                 break;
1207                         case 's':
1208                                 serialize++;
1209                                 break;
1210                         case 't':
1211                                 tmp = 0;
1212                                 if (fstype)
1213                                         usage();
1214                                 if (arg[j+1])
1215                                         tmp = arg+j+1;
1216                                 else if ((i+1) < argc)
1217                                         tmp = argv[++i];
1218                                 else
1219                                         usage();
1220                                 fstype = string_copy(tmp);
1221                                 compile_fs_type(fstype, &fs_type_compiled);
1222                                 goto next_arg;
1223                         case '-':
1224                                 opts_for_fsck++;
1225                                 break;
1226                         case '?':
1227                                 usage();
1228                                 break;
1229                         default:
1230                                 options[++opt] = arg[j];
1231                                 break;
1232                         }
1233                 }
1234         next_arg:
1235                 if (opt) {
1236                         options[0] = '-';
1237                         options[++opt] = '\0';
1238                         if (num_args >= MAX_ARGS) {
1239                                 fprintf(stderr,
1240                                         _("%s: too many arguments\n"),
1241                                         progname);
1242                                 exit(EXIT_ERROR);
1243                         }
1244                         args[num_args++] = string_copy(options);
1245                         opt = 0;
1246                 }
1247         }
1248         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1249                 force_all_parallel++;
1250         if ((tmp = getenv("FSCK_MAX_INST")))
1251             max_running = atoi(tmp);
1252 }
1253
1254 int main(int argc, char *argv[])
1255 {
1256         int i, status = 0;
1257         int interactive = 0;
1258         char *oldpath = getenv("PATH");
1259         const char *fstab;
1260         struct fs_info *fs;
1261
1262         setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1263         setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1264
1265 #ifdef ENABLE_NLS
1266         setlocale(LC_MESSAGES, "");
1267         setlocale(LC_CTYPE, "");
1268         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1269         textdomain(NLS_CAT_NAME);
1270 #endif
1271         blkid_get_cache(&cache, NULL);
1272         PRS(argc, argv);
1273
1274         if (!notitle)
1275                 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1276
1277         fstab = getenv("FSTAB_FILE");
1278         if (!fstab)
1279                 fstab = _PATH_MNTTAB;
1280         load_fs_info(fstab);
1281
1282         /* Update our search path to include uncommon directories. */
1283         if (oldpath) {
1284                 fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1285                                     strlen (oldpath) + 1);
1286                 if (!fsck_path) {
1287                         fprintf(stderr, "%s: Unable to allocate memory for fsck_path\n", progname);
1288                         exit(EXIT_ERROR);
1289                 }
1290                 strcpy (fsck_path, fsck_prefix_path);
1291                 strcat (fsck_path, ":");
1292                 strcat (fsck_path, oldpath);
1293         } else {
1294                 fsck_path = string_copy(fsck_prefix_path);
1295         }
1296
1297         if ((num_devices == 1) || (serialize))
1298                 interactive = 1;
1299
1300         /* If -A was specified ("check all"), do that! */
1301         if (doall)
1302                 return check_all();
1303
1304         if (num_devices == 0) {
1305                 serialize++;
1306                 interactive++;
1307                 return check_all();
1308         }
1309         for (i = 0 ; i < num_devices; i++) {
1310                 if (cancel_requested) {
1311                         if (!kill_sent) {
1312                                 kill_all(SIGTERM);
1313                                 kill_sent++;
1314                         }
1315                         break;
1316                 }
1317                 fs = lookup(devices[i]);
1318                 if (!fs) {
1319                         fs = create_fs_device(devices[i], 0, "auto",
1320                                               0, -1, -1);
1321                         if (!fs)
1322                                 continue;
1323                 }
1324                 if (ignore_mounted && is_mounted(fs->device))
1325                         continue;
1326                 fsck_device(fs, interactive);
1327                 if (serialize ||
1328                     (max_running && (num_running >= max_running))) {
1329                         struct fsck_instance *inst;
1330
1331                         inst = wait_one(0);
1332                         if (inst) {
1333                                 status |= inst->exit_status;
1334                                 free_instance(inst);
1335                         }
1336                         if (verbose > 1)
1337                                 printf("----------------------------------\n");
1338                 }
1339         }
1340         status |= wait_many(FLAG_WAIT_ALL);
1341         free(fsck_path);
1342         blkid_put_cache(cache);
1343         return status;
1344 }