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/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 "support/devname.h"
  63 #include "support/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 static char *devices[MAX_DEVICES];
 102 static char *args[MAX_ARGS];
 103 static int num_devices, num_args;
 104
 105 static int verbose = 0;
 106 static int doall = 0;
 107 static int noexecute = 0;
 108 static int serialize = 0;
 109 static int skip_root = 0;
 110 static int ignore_mounted = 0;
 111 static int notitle = 0;
 112 static int parallel_root = 0;
 113 static int progress = 0;
 114 static int progress_fd = 0;
 115 static int force_all_parallel = 0;
 116 static int num_running = 0;
 117 static int max_running = 0;
 118 static volatile int cancel_requested = 0;
 119 static int kill_sent = 0;
 120 static char *progname;
 121 static char *fstype = NULL;
 122 static struct fs_info *filesys_info = NULL, *filesys_last = NULL;
 123 static struct fsck_instance *instance_list;
 124 static const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
 125 static char *fsck_path = 0;
 126 static 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 = 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           int len = snprintf(prog, sizeof(prog), tpl, s, type);
 413
 414           if ((len < 0) || (len >= (int) sizeof(prog)))
 415                   continue;
 416           if (stat(prog, &st) == 0)
 417                   break;
 418   }
 419   free(p);
 420   return(s ? prog : NULL);
 421 }
 422
 423 static int progress_active(NOARGS)
 424 {
 425         struct fsck_instance *inst;
 426
 427         for (inst = instance_list; inst; inst = inst->next) {
 428                 if (inst->flags & FLAG_DONE)
 429                         continue;
 430                 if (inst->flags & FLAG_PROGRESS)
 431                         return 1;
 432         }
 433         return 0;
 434 }
 435
 436 /*
 437  * Execute a particular fsck program, and link it into the list of
 438  * child processes we are waiting for.
 439  */
 440 static int execute(const char *type, const char *device, const char *mntpt,
 441                    int interactive)
 442 {
 443         char *s, *argv[80], prog[256];
 444         int  argc, i, len;
 445         struct fsck_instance *inst, *p;
 446         pid_t   pid;
 447
 448         len = snprintf(prog, sizeof(prog), "fsck.%s", type);
 449         if ((len < 0) || (len >= (int) sizeof(prog)))
 450                 return EINVAL;
 451
 452         inst = malloc(sizeof(struct fsck_instance));
 453         if (!inst)
 454                 return ENOMEM;
 455         memset(inst, 0, sizeof(struct fsck_instance));
 456
 457         argv[0] = string_copy(prog);
 458         argc = 1;
 459
 460         for (i=0; i <num_args; i++)
 461                 argv[argc++] = string_copy(args[i]);
 462
 463         if (progress) {
 464                 if ((strcmp(type, "ext2") == 0) ||
 465                     (strcmp(type, "ext3") == 0) ||
 466                     (strcmp(type, "ext4") == 0) ||
 467                     (strcmp(type, "ext4dev") == 0)) {
 468                         char tmp[80];
 469
 470                         tmp[0] = 0;
 471                         if (!progress_active()) {
 472                                 snprintf(tmp, 80, "-C%d", progress_fd);
 473                                 inst->flags |= FLAG_PROGRESS;
 474                         } else if (progress_fd)
 475                                 snprintf(tmp, 80, "-C%d", progress_fd * -1);
 476                         if (tmp[0])
 477                                 argv[argc++] = string_copy(tmp);
 478                 }
 479         }
 480
 481         argv[argc++] = string_copy(device);
 482         argv[argc] = 0;
 483
 484         s = find_fsck(prog);
 485         if (s == NULL) {
 486                 fprintf(stderr, _("fsck: %s: not found\n"), prog);
 487                 free(inst);
 488                 return ENOENT;
 489         }
 490
 491         if (verbose || noexecute) {
 492                 printf("[%s (%d) -- %s] ", s, num_running,
 493                        mntpt ? mntpt : device);
 494                 for (i=0; i < argc; i++)
 495                         printf("%s ", argv[i]);
 496                 printf("\n");
 497         }
 498
 499         /* Fork and execute the correct program. */
 500         if (noexecute)
 501                 pid = -1;
 502         else if ((pid = fork()) < 0) {
 503                 perror("fork");
 504                 free(inst);
 505                 return errno;
 506         } else if (pid == 0) {
 507                 if (!interactive)
 508                         close(0);
 509                 (void) execv(s, argv);
 510                 perror(argv[0]);
 511                 free(inst);
 512                 exit(EXIT_ERROR);
 513         }
 514
 515         for (i=0; i < argc; i++)
 516                 free(argv[i]);
 517
 518         inst->pid = pid;
 519         inst->prog = string_copy(prog);
 520         inst->type = string_copy(type);
 521         inst->device = string_copy(device);
 522         inst->base_device = base_device(device);
 523         inst->start_time = time(0);
 524         inst->next = NULL;
 525
 526         /*
 527          * Find the end of the list, so we add the instance on at the end.
 528          */
 529         for (p = instance_list; p && p->next; p = p->next);
 530
 531         if (p)
 532                 p->next = inst;
 533         else
 534                 instance_list = inst;
 535
 536         return 0;
 537 }
 538
 539 /*
 540  * Send a signal to all outstanding fsck child processes
 541  */
 542 static int kill_all(int signum)
 543 {
 544         struct fsck_instance *inst;
 545         int     n = 0;
 546
 547         for (inst = instance_list; inst; inst = inst->next) {
 548                 if (inst->flags & FLAG_DONE)
 549                         continue;
 550                 if (inst->pid <= 0)
 551                         continue;
 552                 kill(inst->pid, signum);
 553                 n++;
 554         }
 555         return n;
 556 }
 557
 558 /*
 559  * Wait for one child process to exit; when it does, unlink it from
 560  * the list of executing child processes, and return it.
 561  */
 562 static struct fsck_instance *wait_one(int flags)
 563 {
 564         int     status;
 565         int     sig;
 566         struct fsck_instance *inst, *inst2, *prev;
 567         pid_t   pid;
 568
 569         if (!instance_list)
 570                 return NULL;
 571
 572         if (noexecute) {
 573                 inst = instance_list;
 574                 prev = 0;
 575 #ifdef RANDOM_DEBUG
 576                 while (inst->next && (random() & 1)) {
 577                         prev = inst;
 578                         inst = inst->next;
 579                 }
 580 #endif
 581                 inst->exit_status = 0;
 582                 goto ret_inst;
 583         }
 584
 585         /*
 586          * gcc -Wall fails saving throw against stupidity
 587          * (inst and prev are thought to be uninitialized variables)
 588          */
 589         inst = prev = NULL;
 590
 591         do {
 592                 pid = waitpid(-1, &status, flags);
 593                 if (cancel_requested && !kill_sent) {
 594                         kill_all(SIGTERM);
 595                         kill_sent++;
 596                 }
 597                 if ((pid == 0) && (flags & WNOHANG))
 598                         return NULL;
 599                 if (pid < 0) {
 600                         if ((errno == EINTR) || (errno == EAGAIN))
 601                                 continue;
 602                         if (errno == ECHILD) {
 603                                 fprintf(stderr,
 604                                         _("%s: wait: No more child process?!?\n"),
 605                                         progname);
 606                                 return NULL;
 607                         }
 608                         perror("wait");
 609                         continue;
 610                 }
 611                 for (prev = 0, inst = instance_list;
 612                      inst;
 613                      prev = inst, inst = inst->next) {
 614                         if (inst->pid == pid)
 615                                 break;
 616                 }
 617         } while (!inst);
 618
 619         if (WIFEXITED(status))
 620                 status = WEXITSTATUS(status);
 621         else if (WIFSIGNALED(status)) {
 622                 sig = WTERMSIG(status);
 623                 if (sig == SIGINT) {
 624                         status = EXIT_UNCORRECTED;
 625                 } else {
 626                         printf(_("Warning... %s for device %s exited "
 627                                "with signal %d.\n"),
 628                                inst->prog, inst->device, sig);
 629                         status = EXIT_ERROR;
 630                 }
 631         } else {
 632                 printf(_("%s %s: status is %x, should never happen.\n"),
 633                        inst->prog, inst->device, status);
 634                 status = EXIT_ERROR;
 635         }
 636         inst->exit_status = status;
 637         inst->flags |= FLAG_DONE;
 638         if (progress && (inst->flags & FLAG_PROGRESS) &&
 639             !progress_active()) {
 640                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 641                         if (inst2->flags & FLAG_DONE)
 642                                 continue;
 643                         if (strcmp(inst2->type, "ext2") &&
 644                             strcmp(inst2->type, "ext3") &&
 645                             strcmp(inst2->type, "ext4") &&
 646                             strcmp(inst2->type, "ext4dev"))
 647                                 continue;
 648                         /*
 649                          * If we've just started the fsck, wait a tiny
 650                          * bit before sending the kill, to give it
 651                          * time to set up the signal handler
 652                          */
 653                         if (inst2->start_time < time(0)+2) {
 654                                 if (fork() == 0) {
 655                                         sleep(1);
 656                                         kill(inst2->pid, SIGUSR1);
 657                                         exit(0);
 658                                 }
 659                         } else
 660                                 kill(inst2->pid, SIGUSR1);
 661                         inst2->flags |= FLAG_PROGRESS;
 662                         break;
 663                 }
 664         }
 665 ret_inst:
 666         if (prev)
 667                 prev->next = inst->next;
 668         else
 669                 instance_list = inst->next;
 670         if (verbose > 1)
 671                 printf(_("Finished with %s (exit status %d)\n"),
 672                        inst->device, inst->exit_status);
 673         num_running--;
 674         return inst;
 675 }
 676
 677 #define FLAG_WAIT_ALL           0
 678 #define FLAG_WAIT_ATLEAST_ONE   1
 679 /*
 680  * Wait until all executing child processes have exited; return the
 681  * logical OR of all of their exit code values.
 682  */
 683 static int wait_many(int flags)
 684 {
 685         struct fsck_instance *inst;
 686         int     global_status = 0;
 687         int     wait_flags = 0;
 688
 689         while ((inst = wait_one(wait_flags))) {
 690                 global_status |= inst->exit_status;
 691                 free_instance(inst);
 692 #ifdef RANDOM_DEBUG
 693                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 694                         break;
 695 #endif
 696                 if (flags & FLAG_WAIT_ATLEAST_ONE)
 697                         wait_flags = WNOHANG;
 698         }
 699         return global_status;
 700 }
 701
 702 /*
 703  * Run the fsck program on a particular device
 704  *
 705  * If the type is specified using -t, and it isn't prefixed with "no"
 706  * (as in "noext2") and only one filesystem type is specified, then
 707  * use that type regardless of what is specified in /etc/fstab.
 708  *
 709  * If the type isn't specified by the user, then use either the type
 710  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 711  */
 712 static void fsck_device(struct fs_info *fs, int interactive)
 713 {
 714         const char *type;
 715         int retval;
 716
 717         interpret_type(fs);
 718
 719         if (strcmp(fs->type, "auto") != 0)
 720                 type = fs->type;
 721         else if (fstype && strncmp(fstype, "no", 2) &&
 722             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 723             !strchr(fstype, ','))
 724                 type = fstype;
 725         else
 726                 type = DEFAULT_FSTYPE;
 727
 728         num_running++;
 729         retval = execute(type, fs->device, fs->mountpt, interactive);
 730         if (retval) {
 731                 fprintf(stderr, _("%s: Error %d while executing fsck.%s "
 732                         "for %s\n"), progname, retval, type, fs->device);
 733                 num_running--;
 734         }
 735 }
 736
 737
 738 /*
 739  * Deal with the fsck -t argument.
 740  */
 741 static struct fs_type_compile {
 742         char **list;
 743         int *type;
 744         int  negate;
 745 } fs_type_compiled;
 746
 747 #define FS_TYPE_NORMAL  0
 748 #define FS_TYPE_OPT     1
 749 #define FS_TYPE_NEGOPT  2
 750
 751 static const char *fs_type_syntax_error =
 752 N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
 753    "with 'no' or '!'.\n");
 754
 755 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 756 {
 757         char    *cp, *list, *s;
 758         int     num = 2;
 759         int     negate, first_negate = 1;
 760
 761         if (fs_type) {
 762                 for (cp=fs_type; *cp; cp++) {
 763                         if (*cp == ',')
 764                                 num++;
 765                 }
 766         }
 767
 768         cmp->list = malloc(num * sizeof(char *));
 769         cmp->type = malloc(num * sizeof(int));
 770         if (!cmp->list || !cmp->type) {
 771                 fputs(_("Couldn't allocate memory for filesystem types\n"),
 772                       stderr);
 773                 exit(EXIT_ERROR);
 774         }
 775         memset(cmp->list, 0, num * sizeof(char *));
 776         memset(cmp->type, 0, num * sizeof(int));
 777         cmp->negate = 0;
 778
 779         if (!fs_type)
 780                 return;
 781
 782         list = string_copy(fs_type);
 783         num = 0;
 784         s = strtok(list, ",");
 785         while(s) {
 786                 negate = 0;
 787                 if (strncmp(s, "no", 2) == 0) {
 788                         s += 2;
 789                         negate = 1;
 790                 } else if (*s == '!') {
 791                         s++;
 792                         negate = 1;
 793                 }
 794                 if (strcmp(s, "loop") == 0)
 795                         /* loop is really short-hand for opts=loop */
 796                         goto loop_special_case;
 797                 else if (strncmp(s, "opts=", 5) == 0) {
 798                         s += 5;
 799                 loop_special_case:
 800                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 801                 } else {
 802                         if (first_negate) {
 803                                 cmp->negate = negate;
 804                                 first_negate = 0;
 805                         }
 806                         if ((negate && !cmp->negate) ||
 807                             (!negate && cmp->negate)) {
 808                                 fputs(_(fs_type_syntax_error), stderr);
 809                                 free(list);
 810                                 exit(EXIT_USAGE);
 811                         }
 812                 }
 813 #if 0
 814                 printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
 815 #endif
 816                 cmp->list[num++] = string_copy(s);
 817                 s = strtok(NULL, ",");
 818         }
 819         free(list);
 820 }
 821
 822 /*
 823  * This function returns true if a particular option appears in a
 824  * comma-delimited options list
 825  */
 826 static int opt_in_list(const char *opt, char *optlist)
 827 {
 828         char    *list, *s;
 829
 830         if (!optlist)
 831                 return 0;
 832         list = string_copy(optlist);
 833
 834         s = strtok(list, ",");
 835         while(s) {
 836                 if (strcmp(s, opt) == 0) {
 837                         free(list);
 838                         return 1;
 839                 }
 840                 s = strtok(NULL, ",");
 841         }
 842         free(list);
 843         return 0;
 844 }
 845
 846 /* See if the filesystem matches the criteria given by the -t option */
 847 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 848 {
 849         int n, ret = 0, checked_type = 0;
 850         char *cp;
 851
 852         if (cmp->list == 0 || cmp->list[0] == 0)
 853                 return 1;
 854
 855         for (n=0; (cp = cmp->list[n]); n++) {
 856                 switch (cmp->type[n]) {
 857                 case FS_TYPE_NORMAL:
 858                         checked_type++;
 859                         if (strcmp(cp, fs->type) == 0) {
 860                                 ret = 1;
 861                         }
 862                         break;
 863                 case FS_TYPE_NEGOPT:
 864                         if (opt_in_list(cp, fs->opts))
 865                                 return 0;
 866                         break;
 867                 case FS_TYPE_OPT:
 868                         if (!opt_in_list(cp, fs->opts))
 869                                 return 0;
 870                         break;
 871                 }
 872         }
 873         if (checked_type == 0)
 874                 return 1;
 875         return (cmp->negate ? !ret : ret);
 876 }
 877
 878 /* Check if we should ignore this filesystem. */
 879 static int ignore(struct fs_info *fs)
 880 {
 881         const char **ip;
 882         int wanted = 0;
 883
 884         /*
 885          * If the pass number is 0, ignore it.
 886          */
 887         if (fs->passno == 0)
 888                 return 1;
 889
 890         /*
 891          * If this is a bind mount, ignore it.
 892          */
 893         if (opt_in_list("bind", fs->opts)) {
 894                 fprintf(stderr,
 895                         _("%s: skipping bad line in /etc/fstab: bind mount with nonzero fsck pass number\n"),
 896                         fs->mountpt);
 897                 return 1;
 898         }
 899
 900         interpret_type(fs);
 901
 902         /*
 903          * If a specific fstype is specified, and it doesn't match,
 904          * ignore it.
 905          */
 906         if (!fs_match(fs, &fs_type_compiled)) return 1;
 907
 908         /* Are we ignoring this type? */
 909         for(ip = ignored_types; *ip; ip++)
 910                 if (strcmp(fs->type, *ip) == 0) return 1;
 911
 912         /* Do we really really want to check this fs? */
 913         for(ip = really_wanted; *ip; ip++)
 914                 if (strcmp(fs->type, *ip) == 0) {
 915                         wanted = 1;
 916                         break;
 917                 }
 918
 919         /* See if the <fsck.fs> program is available. */
 920         if (find_fsck(fs->type) == NULL) {
 921                 if (wanted)
 922                         fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
 923                                 fs->device, fs->type);
 924                 return 1;
 925         }
 926
 927         /* We can and want to check this file system type. */
 928         return 0;
 929 }
 930
 931 /*
 932  * Returns TRUE if a partition on the same disk is already being
 933  * checked.
 934  */
 935 static int device_already_active(char *device)
 936 {
 937         struct fsck_instance *inst;
 938         char *base;
 939
 940         if (force_all_parallel)
 941                 return 0;
 942
 943 #ifdef BASE_MD
 944         /* Don't check a soft raid disk with any other disk */
 945         if (instance_list &&
 946             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
 947              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
 948                 return 1;
 949 #endif
 950
 951         base = base_device(device);
 952         /*
 953          * If we don't know the base device, assume that the device is
 954          * already active if there are any fsck instances running.
 955          */
 956         if (!base)
 957                 return (instance_list != 0);
 958         for (inst = instance_list; inst; inst = inst->next) {
 959                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
 960                         free(base);
 961                         return 1;
 962                 }
 963         }
 964         free(base);
 965         return 0;
 966 }
 967
 968 /* Check all file systems, using the /etc/fstab table. */
 969 static int check_all(NOARGS)
 970 {
 971         struct fs_info *fs = NULL;
 972         int status = EXIT_OK;
 973         int not_done_yet = 1;
 974         int passno = 1;
 975         int pass_done;
 976
 977         if (verbose)
 978                 fputs(_("Checking all file systems.\n"), stdout);
 979
 980         /*
 981          * Do an initial scan over the filesystem; mark filesystems
 982          * which should be ignored as done, and resolve any "auto"
 983          * filesystem types (done as a side-effect of calling ignore()).
 984          */
 985         for (fs = filesys_info; fs; fs = fs->next) {
 986                 if (ignore(fs))
 987                         fs->flags |= FLAG_DONE;
 988         }
 989
 990         /*
 991          * Find and check the root filesystem.
 992          */
 993         if (!parallel_root) {
 994                 for (fs = filesys_info; fs; fs = fs->next) {
 995                         if (!strcmp(fs->mountpt, "/"))
 996                                 break;
 997                 }
 998                 if (fs) {
 999                         if (!skip_root && !ignore(fs) &&
1000                             !(ignore_mounted && is_mounted(fs->device))) {
1001                                 fsck_device(fs, 1);
1002                                 status |= wait_many(FLAG_WAIT_ALL);
1003                                 if (status > EXIT_NONDESTRUCT)
1004                                         return status;
1005                         }
1006                         fs->flags |= FLAG_DONE;
1007                 }
1008         }
1009         /*
1010          * This is for the bone-headed user who enters the root
1011          * filesystem twice.  Skip root will skip all root entries.
1012          */
1013         if (skip_root)
1014                 for (fs = filesys_info; fs; fs = fs->next)
1015                         if (!strcmp(fs->mountpt, "/"))
1016                                 fs->flags |= FLAG_DONE;
1017
1018         while (not_done_yet) {
1019                 not_done_yet = 0;
1020                 pass_done = 1;
1021
1022                 for (fs = filesys_info; fs; fs = fs->next) {
1023                         if (cancel_requested)
1024                                 break;
1025                         if (fs->flags & FLAG_DONE)
1026                                 continue;
1027                         /*
1028                          * If the filesystem's pass number is higher
1029                          * than the current pass number, then we don't
1030                          * do it yet.
1031                          */
1032                         if (fs->passno > passno) {
1033                                 not_done_yet++;
1034                                 continue;
1035                         }
1036                         if (ignore_mounted && is_mounted(fs->device)) {
1037                                 fs->flags |= FLAG_DONE;
1038                                 continue;
1039                         }
1040                         /*
1041                          * If a filesystem on a particular device has
1042                          * already been spawned, then we need to defer
1043                          * this to another pass.
1044                          */
1045                         if (device_already_active(fs->device)) {
1046                                 pass_done = 0;
1047                                 continue;
1048                         }
1049                         /*
1050                          * Spawn off the fsck process
1051                          */
1052                         fsck_device(fs, serialize);
1053                         fs->flags |= FLAG_DONE;
1054
1055                         /*
1056                          * Only do one filesystem at a time, or if we
1057                          * have a limit on the number of fsck's extant
1058                          * at one time, apply that limit.
1059                          */
1060                         if (serialize ||
1061                             (max_running && (num_running >= max_running))) {
1062                                 pass_done = 0;
1063                                 break;
1064                         }
1065                 }
1066                 if (cancel_requested)
1067                         break;
1068                 if (verbose > 1)
1069                         printf(_("--waiting-- (pass %d)\n"), passno);
1070                 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1071                                     FLAG_WAIT_ATLEAST_ONE);
1072                 if (pass_done) {
1073                         if (verbose > 1)
1074                                 printf("----------------------------------\n");
1075                         passno++;
1076                 } else
1077                         not_done_yet++;
1078         }
1079         if (cancel_requested && !kill_sent) {
1080                 kill_all(SIGTERM);
1081                 kill_sent++;
1082         }
1083         status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1084         return status;
1085 }
1086
1087 static void usage(NOARGS)
1088 {
1089         fputs(_("Usage: fsck [-AMNPRTV] [ -C [ fd ] ] [-t fstype] [fs-options] [filesys ...]\n"), stderr);
1090         exit(EXIT_USAGE);
1091 }
1092
1093 #ifdef HAVE_SIGNAL_H
1094 static void signal_cancel(int sig FSCK_ATTR((unused)))
1095 {
1096         cancel_requested++;
1097 }
1098 #endif
1099
1100 static void PRS(int argc, char *argv[])
1101 {
1102         int     i, j;
1103         char    *arg, *dev, *tmp = 0;
1104         char    options[128];
1105         int     opt = 0;
1106         int     opts_for_fsck = 0;
1107 #ifdef HAVE_SIGNAL_H
1108         struct sigaction        sa;
1109
1110         /*
1111          * Set up signal action
1112          */
1113         memset(&sa, 0, sizeof(struct sigaction));
1114         sa.sa_handler = signal_cancel;
1115         sigaction(SIGINT, &sa, 0);
1116         sigaction(SIGTERM, &sa, 0);
1117 #endif
1118
1119         num_devices = 0;
1120         num_args = 0;
1121         instance_list = 0;
1122
1123         progname = argv[0];
1124
1125         for (i=1; i < argc; i++) {
1126                 arg = argv[i];
1127                 if (!arg)
1128                         continue;
1129                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1130                         if (num_devices >= MAX_DEVICES) {
1131                                 fprintf(stderr, _("%s: too many devices\n"),
1132                                         progname);
1133                                 exit(EXIT_ERROR);
1134                         }
1135                         dev = get_devname(cache, arg, NULL);
1136                         if (!dev && strchr(arg, '=')) {
1137                                 /*
1138                                  * Check to see if we failed because
1139                                  * /proc/partitions isn't found.
1140                                  */
1141                                 if (access("/proc/partitions", R_OK) < 0) {
1142                                         fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1143                                                 strerror(errno));
1144                                         fprintf(stderr, "Is /proc mounted?\n");
1145                                         exit(EXIT_ERROR);
1146                                 }
1147                                 /*
1148                                  * Check to see if this is because
1149                                  * we're not running as root
1150                                  */
1151                                 if (geteuid())
1152                                         fprintf(stderr,
1153                 "Must be root to scan for matching filesystems: %s\n", arg);
1154                                 else
1155                                         fprintf(stderr,
1156                 "Couldn't find matching filesystem: %s\n", arg);
1157                                 exit(EXIT_ERROR);
1158                         }
1159                         devices[num_devices++] = dev ? dev : string_copy(arg);
1160                         continue;
1161                 }
1162                 if (arg[0] != '-' || opts_for_fsck) {
1163                         if (num_args >= MAX_ARGS) {
1164                                 fprintf(stderr, _("%s: too many arguments\n"),
1165                                         progname);
1166                                 exit(EXIT_ERROR);
1167                         }
1168                         args[num_args++] = string_copy(arg);
1169                         continue;
1170                 }
1171                 for (j=1; arg[j]; j++) {
1172                         if (opts_for_fsck) {
1173                                 options[++opt] = arg[j];
1174                                 continue;
1175                         }
1176                         switch (arg[j]) {
1177                         case 'A':
1178                                 doall++;
1179                                 break;
1180                         case 'C':
1181                                 progress++;
1182                                 if (arg[j+1]) {
1183                                         progress_fd = string_to_int(arg+j+1);
1184                                         if (progress_fd < 0)
1185                                                 progress_fd = 0;
1186                                         else
1187                                                 goto next_arg;
1188                                 } else if (argc > i + 1 &&
1189                                            argv[i + 1][0] != '-') {
1190                                         progress_fd = string_to_int(argv[i]);
1191                                         if (progress_fd < 0)
1192                                                 progress_fd = 0;
1193                                         else {
1194                                                 ++i;
1195                                                 goto next_arg;
1196                                         }
1197                                 }
1198                                 break;
1199                         case 'V':
1200                                 verbose++;
1201                                 break;
1202                         case 'N':
1203                                 noexecute++;
1204                                 break;
1205                         case 'R':
1206                                 skip_root++;
1207                                 break;
1208                         case 'T':
1209                                 notitle++;
1210                                 break;
1211                         case 'M':
1212                                 ignore_mounted++;
1213                                 break;
1214                         case 'P':
1215                                 parallel_root++;
1216                                 break;
1217                         case 's':
1218                                 serialize++;
1219                                 break;
1220                         case 't':
1221                                 tmp = 0;
1222                                 if (fstype)
1223                                         usage();
1224                                 if (arg[j+1])
1225                                         tmp = arg+j+1;
1226                                 else if ((i+1) < argc)
1227                                         tmp = argv[++i];
1228                                 else
1229                                         usage();
1230                                 fstype = string_copy(tmp);
1231                                 compile_fs_type(fstype, &fs_type_compiled);
1232                                 goto next_arg;
1233                         case '-':
1234                                 opts_for_fsck++;
1235                                 break;
1236                         case '?':
1237                                 usage();
1238                                 break;
1239                         default:
1240                                 options[++opt] = arg[j];
1241                                 break;
1242                         }
1243                 }
1244         next_arg:
1245                 if (opt) {
1246                         options[0] = '-';
1247                         options[++opt] = '\0';
1248                         if (num_args >= MAX_ARGS) {
1249                                 fprintf(stderr,
1250                                         _("%s: too many arguments\n"),
1251                                         progname);
1252                                 exit(EXIT_ERROR);
1253                         }
1254                         args[num_args++] = string_copy(options);
1255                         opt = 0;
1256                 }
1257         }
1258         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1259                 force_all_parallel++;
1260         if ((tmp = getenv("FSCK_MAX_INST")))
1261             max_running = atoi(tmp);
1262 }
1263
1264 int main(int argc, char *argv[])
1265 {
1266         int i, status = 0;
1267         int interactive = 0;
1268         char *oldpath = getenv("PATH");
1269         const char *fstab;
1270         struct fs_info *fs;
1271
1272         setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1273         setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1274
1275 #ifdef ENABLE_NLS
1276         setlocale(LC_MESSAGES, "");
1277         setlocale(LC_CTYPE, "");
1278         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1279         textdomain(NLS_CAT_NAME);
1280 #endif
1281         blkid_get_cache(&cache, NULL);
1282         PRS(argc, argv);
1283
1284         if (!notitle)
1285                 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1286
1287         fstab = getenv("FSTAB_FILE");
1288         if (!fstab)
1289                 fstab = _PATH_MNTTAB;
1290         load_fs_info(fstab);
1291
1292         /* Update our search path to include uncommon directories. */
1293         if (oldpath) {
1294                 fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1295                                     strlen (oldpath) + 1);
1296                 if (!fsck_path) {
1297                         fprintf(stderr, "%s: Unable to allocate memory for fsck_path\n", progname);
1298                         exit(EXIT_ERROR);
1299                 }
1300                 strcpy (fsck_path, fsck_prefix_path);
1301                 strcat (fsck_path, ":");
1302                 strcat (fsck_path, oldpath);
1303         } else {
1304                 fsck_path = string_copy(fsck_prefix_path);
1305         }
1306
1307         if ((num_devices == 1) || (serialize))
1308                 interactive = 1;
1309
1310         /* If -A was specified ("check all"), do that! */
1311         if (doall)
1312                 return check_all();
1313
1314         if (num_devices == 0) {
1315                 serialize++;
1316                 interactive++;
1317                 return check_all();
1318         }
1319         for (i = 0 ; i < num_devices; i++) {
1320                 if (cancel_requested) {
1321                         if (!kill_sent) {
1322                                 kill_all(SIGTERM);
1323                                 kill_sent++;
1324                         }
1325                         break;
1326                 }
1327                 fs = lookup(devices[i]);
1328                 if (!fs) {
1329                         fs = create_fs_device(devices[i], 0, "auto",
1330                                               0, -1, -1);
1331                         if (!fs)
1332                                 continue;
1333                 }
1334                 if (ignore_mounted && is_mounted(fs->device))
1335                         continue;
1336                 fsck_device(fs, interactive);
1337                 if (serialize ||
1338                     (max_running && (num_running >= max_running))) {
1339                         struct fsck_instance *inst;
1340
1341                         inst = wait_one(0);
1342                         if (inst) {
1343                                 status |= inst->exit_status;
1344                                 free_instance(inst);
1345                         }
1346                         if (verbose > 1)
1347                                 printf("----------------------------------\n");
1348                 }
1349         }
1350         status |= wait_many(FLAG_WAIT_ALL);
1351         free(fsck_path);
1352         blkid_put_cache(cache);
1353         return status;
1354 }