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/nls-enable.h"
  63 #include "fsck.h"
  64 #include "blkid/blkid.h"
  65
  66 #ifndef _PATH_MNTTAB
  67 #define _PATH_MNTTAB    "/etc/fstab"
  68 #endif
  69
  70 static const char *ignored_types[] = {
  71         "ignore",
  72         "iso9660",
  73         "nfs",
  74         "proc",
  75         "sw",
  76         "swap",
  77         "tmpfs",
  78         "devpts",
  79         NULL
  80 };
  81
  82 static const char *really_wanted[] = {
  83         "minix",
  84         "ext2",
  85         "ext3",
  86         "ext4",
  87         "ext4dev",
  88         "jfs",
  89         "reiserfs",
  90         "xiafs",
  91         "xfs",
  92         NULL
  93 };
  94
  95 #define BASE_MD "/dev/md"
  96
  97 /*
  98  * Global variables for options
  99  */
 100 static char *devices[MAX_DEVICES];
 101 static char *args[MAX_ARGS];
 102 static int num_devices, num_args;
 103
 104 static int verbose = 0;
 105 static int doall = 0;
 106 static int noexecute = 0;
 107 static int serialize = 0;
 108 static int skip_root = 0;
 109 static int ignore_mounted = 0;
 110 static int notitle = 0;
 111 static int parallel_root = 0;
 112 static int progress = 0;
 113 static int progress_fd = 0;
 114 static int force_all_parallel = 0;
 115 static int num_running = 0;
 116 static int max_running = 0;
 117 static volatile int cancel_requested = 0;
 118 static int kill_sent = 0;
 119 static char *progname;
 120 static char *fstype = NULL;
 121 static struct fs_info *filesys_info = NULL, *filesys_last = NULL;
 122 static struct fsck_instance *instance_list;
 123 static const char *fsck_prefix_path = "/sbin:/sbin/fs.d:/sbin/fs:/etc/fs:/etc";
 124 static char *fsck_path = 0;
 125 static blkid_cache cache = NULL;
 126
 127 static char *string_copy(const char *s)
 128 {
 129         char    *ret;
 130
 131         if (!s)
 132                 return 0;
 133         ret = malloc(strlen(s)+1);
 134         if (ret)
 135                 strcpy(ret, s);
 136         return ret;
 137 }
 138
 139 static int string_to_int(const char *s)
 140 {
 141         long l;
 142         char *p;
 143
 144         l = strtol(s, &p, 0);
 145         if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
 146                 return -1;
 147         else
 148                 return (int) l;
 149 }
 150
 151 static int ignore(struct fs_info *);
 152
 153 static char *skip_over_blank(char *cp)
 154 {
 155         while (*cp && isspace(*cp))
 156                 cp++;
 157         return cp;
 158 }
 159
 160 static char *skip_over_word(char *cp)
 161 {
 162         while (*cp && !isspace(*cp))
 163                 cp++;
 164         return cp;
 165 }
 166
 167 static void strip_line(char *line)
 168 {
 169         char    *p;
 170
 171         while (*line) {
 172                 p = line + strlen(line) - 1;
 173                 if ((*p == '\n') || (*p == '\r'))
 174                         *p = 0;
 175                 else
 176                         break;
 177         }
 178 }
 179
 180 static char *parse_word(char **buf)
 181 {
 182         char *word, *next;
 183
 184         word = *buf;
 185         if (*word == 0)
 186                 return 0;
 187
 188         word = skip_over_blank(word);
 189         next = skip_over_word(word);
 190         if (*next)
 191                 *next++ = 0;
 192         *buf = next;
 193         return word;
 194 }
 195
 196 static void parse_escape(char *word)
 197 {
 198         char    *p, *q;
 199         int     ac, i;
 200
 201         if (!word)
 202                 return;
 203
 204         for (p = word, q = word; *p; p++, q++) {
 205                 *q = *p;
 206                 if (*p != '\\')
 207                         continue;
 208                 if (*++p == 0)
 209                         break;
 210                 if (*p == 't') {
 211                         *q = '\t';
 212                         continue;
 213                 }
 214                 if (*p == 'n') {
 215                         *q = '\n';
 216                         continue;
 217                 }
 218                 if (!isdigit(*p)) {
 219                         *q = *p;
 220                         continue;
 221                 }
 222                 ac = 0;
 223                 for (i = 0; i < 3; i++, p++) {
 224                         if (!isdigit(*p))
 225                                 break;
 226                         ac = (ac * 8) + (*p - '0');
 227                 }
 228                 *q = ac;
 229                 p--;
 230         }
 231         *q = 0;
 232 }
 233
 234 static void free_instance(struct fsck_instance *i)
 235 {
 236         free(i->prog);
 237         free(i->device);
 238         free(i->base_device);
 239         free(i);
 240         return;
 241 }
 242
 243 static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
 244                                         const char *type, const char *opts,
 245                                         int freq, int passno)
 246 {
 247         struct fs_info *fs;
 248
 249         if (!(fs = malloc(sizeof(struct fs_info))))
 250                 return NULL;
 251
 252         fs->device = string_copy(device);
 253         fs->mountpt = string_copy(mntpnt);
 254         fs->type = string_copy(type);
 255         fs->opts = string_copy(opts ? opts : "");
 256         fs->freq = freq;
 257         fs->passno = passno;
 258         fs->flags = 0;
 259         fs->next = NULL;
 260
 261         if (!filesys_info)
 262                 filesys_info = fs;
 263         else
 264                 filesys_last->next = fs;
 265         filesys_last = fs;
 266
 267         return fs;
 268 }
 269
 270
 271
 272 static int parse_fstab_line(char *line, struct fs_info **ret_fs)
 273 {
 274         char    *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
 275         struct fs_info *fs;
 276
 277         *ret_fs = 0;
 278         strip_line(line);
 279         cp = line;
 280
 281         device = parse_word(&cp);
 282         if (!device || *device == '#')
 283                 return 0;       /* Ignore blank lines and comments */
 284         mntpnt = parse_word(&cp);
 285         type = parse_word(&cp);
 286         opts = parse_word(&cp);
 287         freq = parse_word(&cp);
 288         passno = parse_word(&cp);
 289
 290         if (!mntpnt || !type)
 291                 return -1;
 292
 293         parse_escape(device);
 294         parse_escape(mntpnt);
 295         parse_escape(type);
 296         parse_escape(opts);
 297         parse_escape(freq);
 298         parse_escape(passno);
 299
 300         dev = blkid_get_devname(cache, device, NULL);
 301         if (dev)
 302                 device = dev;
 303
 304         if (strchr(type, ','))
 305                 type = 0;
 306
 307         fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
 308                               freq ? atoi(freq) : -1,
 309                               passno ? atoi(passno) : -1);
 310         free(dev);
 311
 312         if (!fs)
 313                 return -1;
 314         *ret_fs = fs;
 315         return 0;
 316 }
 317
 318 static void interpret_type(struct fs_info *fs)
 319 {
 320         char    *t;
 321
 322         if (strcmp(fs->type, "auto") != 0)
 323                 return;
 324         t = blkid_get_tag_value(cache, "TYPE", fs->device);
 325         if (t) {
 326                 free(fs->type);
 327                 fs->type = t;
 328         }
 329 }
 330
 331 /*
 332  * Load the filesystem database from /etc/fstab
 333  */
 334 static void load_fs_info(const char *filename)
 335 {
 336         FILE    *f;
 337         char    buf[1024];
 338         int     lineno = 0;
 339         int     old_fstab = 1;
 340         struct fs_info *fs;
 341
 342         if ((f = fopen(filename, "r")) == NULL) {
 343                 fprintf(stderr, _("WARNING: couldn't open %s: %s\n"),
 344                         filename, strerror(errno));
 345                 return;
 346         }
 347         while (!feof(f)) {
 348                 lineno++;
 349                 if (!fgets(buf, sizeof(buf), f))
 350                         break;
 351                 buf[sizeof(buf)-1] = 0;
 352                 if (parse_fstab_line(buf, &fs) < 0) {
 353                         fprintf(stderr, _("WARNING: bad format "
 354                                 "on line %d of %s\n"), lineno, filename);
 355                         continue;
 356                 }
 357                 if (!fs)
 358                         continue;
 359                 if (fs->passno < 0)
 360                         fs->passno = 0;
 361                 else
 362                         old_fstab = 0;
 363         }
 364
 365         fclose(f);
 366
 367         if (old_fstab && filesys_info) {
 368                 fputs("\007\007\007", stderr);
 369                 fputs(_(
 370                 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
 371                 "       field.  I will kludge around things for you, but you\n"
 372                 "       should fix your /etc/fstab file as soon as you can.\n\n"), stderr);
 373
 374                 for (fs = filesys_info; fs; fs = fs->next) {
 375                         fs->passno = 1;
 376                 }
 377         }
 378 }
 379
 380 /* Lookup filesys in /etc/fstab and return the corresponding entry. */
 381 static struct fs_info *lookup(char *filesys)
 382 {
 383         struct fs_info *fs;
 384
 385         /* No filesys name given. */
 386         if (filesys == NULL)
 387                 return NULL;
 388
 389         for (fs = filesys_info; fs; fs = fs->next) {
 390                 if (!strcmp(filesys, fs->device) ||
 391                     (fs->mountpt && !strcmp(filesys, fs->mountpt)))
 392                         break;
 393         }
 394
 395         return fs;
 396 }
 397
 398 /* Find fsck program for a given fs type. */
 399 static char *find_fsck(char *type)
 400 {
 401   char *s;
 402   const char *tpl;
 403   static char prog[256];
 404   char *p = string_copy(fsck_path);
 405   struct stat st;
 406
 407   /* Are we looking for a program or just a type? */
 408   tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
 409
 410   for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
 411           int len = snprintf(prog, sizeof(prog), tpl, s, type);
 412
 413           if ((len < 0) || (len >= (int) sizeof(prog)))
 414                   continue;
 415           if (stat(prog, &st) == 0)
 416                   break;
 417   }
 418   free(p);
 419   return(s ? prog : NULL);
 420 }
 421
 422 static int progress_active(NOARGS)
 423 {
 424         struct fsck_instance *inst;
 425
 426         for (inst = instance_list; inst; inst = inst->next) {
 427                 if (inst->flags & FLAG_DONE)
 428                         continue;
 429                 if (inst->flags & FLAG_PROGRESS)
 430                         return 1;
 431         }
 432         return 0;
 433 }
 434
 435 /*
 436  * Execute a particular fsck program, and link it into the list of
 437  * child processes we are waiting for.
 438  */
 439 static int execute(const char *type, const char *device, const char *mntpt,
 440                    int interactive)
 441 {
 442         char *s, *argv[80], prog[256];
 443         int  argc, i, len;
 444         struct fsck_instance *inst, *p;
 445         pid_t   pid;
 446
 447         len = snprintf(prog, sizeof(prog), "fsck.%s", type);
 448         if ((len < 0) || (len >= (int) sizeof(prog)))
 449                 return EINVAL;
 450
 451         inst = malloc(sizeof(struct fsck_instance));
 452         if (!inst)
 453                 return ENOMEM;
 454         memset(inst, 0, sizeof(struct fsck_instance));
 455
 456         argv[0] = string_copy(prog);
 457         argc = 1;
 458
 459         for (i=0; i <num_args; i++)
 460                 argv[argc++] = string_copy(args[i]);
 461
 462         if (progress) {
 463                 if ((strcmp(type, "ext2") == 0) ||
 464                     (strcmp(type, "ext3") == 0) ||
 465                     (strcmp(type, "ext4") == 0) ||
 466                     (strcmp(type, "ext4dev") == 0)) {
 467                         char tmp[80];
 468
 469                         tmp[0] = 0;
 470                         if (!progress_active()) {
 471                                 snprintf(tmp, 80, "-C%d", progress_fd);
 472                                 inst->flags |= FLAG_PROGRESS;
 473                         } else if (progress_fd)
 474                                 snprintf(tmp, 80, "-C%d", progress_fd * -1);
 475                         if (tmp[0])
 476                                 argv[argc++] = string_copy(tmp);
 477                 }
 478         }
 479
 480         argv[argc++] = string_copy(device);
 481         argv[argc] = 0;
 482
 483         s = find_fsck(prog);
 484         if (s == NULL) {
 485                 fprintf(stderr, _("fsck: %s: not found\n"), prog);
 486                 free(inst);
 487                 return ENOENT;
 488         }
 489
 490         if (verbose || noexecute) {
 491                 printf("[%s (%d) -- %s] ", s, num_running,
 492                        mntpt ? mntpt : device);
 493                 for (i=0; i < argc; i++)
 494                         printf("%s ", argv[i]);
 495                 printf("\n");
 496         }
 497
 498         /* Fork and execute the correct program. */
 499         if (noexecute)
 500                 pid = -1;
 501         else if ((pid = fork()) < 0) {
 502                 perror("fork");
 503                 free(inst);
 504                 return errno;
 505         } else if (pid == 0) {
 506                 if (!interactive)
 507                         close(0);
 508                 (void) execv(s, argv);
 509                 perror(argv[0]);
 510                 free(inst);
 511                 exit(EXIT_ERROR);
 512         }
 513
 514         for (i=0; i < argc; i++)
 515                 free(argv[i]);
 516
 517         inst->pid = pid;
 518         inst->prog = string_copy(prog);
 519         inst->type = string_copy(type);
 520         inst->device = string_copy(device);
 521         inst->base_device = base_device(device);
 522         inst->start_time = time(0);
 523         inst->next = NULL;
 524
 525         /*
 526          * Find the end of the list, so we add the instance on at the end.
 527          */
 528         for (p = instance_list; p && p->next; p = p->next);
 529
 530         if (p)
 531                 p->next = inst;
 532         else
 533                 instance_list = inst;
 534
 535         return 0;
 536 }
 537
 538 /*
 539  * Send a signal to all outstanding fsck child processes
 540  */
 541 static int kill_all(int signum)
 542 {
 543         struct fsck_instance *inst;
 544         int     n = 0;
 545
 546         for (inst = instance_list; inst; inst = inst->next) {
 547                 if (inst->flags & FLAG_DONE)
 548                         continue;
 549                 kill(inst->pid, signum);
 550                 n++;
 551         }
 552         return n;
 553 }
 554
 555 /*
 556  * Wait for one child process to exit; when it does, unlink it from
 557  * the list of executing child processes, and return it.
 558  */
 559 static struct fsck_instance *wait_one(int flags)
 560 {
 561         int     status;
 562         int     sig;
 563         struct fsck_instance *inst, *inst2, *prev;
 564         pid_t   pid;
 565
 566         if (!instance_list)
 567                 return NULL;
 568
 569         if (noexecute) {
 570                 inst = instance_list;
 571                 prev = 0;
 572 #ifdef RANDOM_DEBUG
 573                 while (inst->next && (random() & 1)) {
 574                         prev = inst;
 575                         inst = inst->next;
 576                 }
 577 #endif
 578                 inst->exit_status = 0;
 579                 goto ret_inst;
 580         }
 581
 582         /*
 583          * gcc -Wall fails saving throw against stupidity
 584          * (inst and prev are thought to be uninitialized variables)
 585          */
 586         inst = prev = NULL;
 587
 588         do {
 589                 pid = waitpid(-1, &status, flags);
 590                 if (cancel_requested && !kill_sent) {
 591                         kill_all(SIGTERM);
 592                         kill_sent++;
 593                 }
 594                 if ((pid == 0) && (flags & WNOHANG))
 595                         return NULL;
 596                 if (pid < 0) {
 597                         if ((errno == EINTR) || (errno == EAGAIN))
 598                                 continue;
 599                         if (errno == ECHILD) {
 600                                 fprintf(stderr,
 601                                         _("%s: wait: No more child process?!?\n"),
 602                                         progname);
 603                                 return NULL;
 604                         }
 605                         perror("wait");
 606                         continue;
 607                 }
 608                 for (prev = 0, inst = instance_list;
 609                      inst;
 610                      prev = inst, inst = inst->next) {
 611                         if (inst->pid == pid)
 612                                 break;
 613                 }
 614         } while (!inst);
 615
 616         if (WIFEXITED(status))
 617                 status = WEXITSTATUS(status);
 618         else if (WIFSIGNALED(status)) {
 619                 sig = WTERMSIG(status);
 620                 if (sig == SIGINT) {
 621                         status = EXIT_UNCORRECTED;
 622                 } else {
 623                         printf(_("Warning... %s for device %s exited "
 624                                "with signal %d.\n"),
 625                                inst->prog, inst->device, sig);
 626                         status = EXIT_ERROR;
 627                 }
 628         } else {
 629                 printf(_("%s %s: status is %x, should never happen.\n"),
 630                        inst->prog, inst->device, status);
 631                 status = EXIT_ERROR;
 632         }
 633         inst->exit_status = status;
 634         inst->flags |= FLAG_DONE;
 635         if (progress && (inst->flags & FLAG_PROGRESS) &&
 636             !progress_active()) {
 637                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 638                         if (inst2->flags & FLAG_DONE)
 639                                 continue;
 640                         if (strcmp(inst2->type, "ext2") &&
 641                             strcmp(inst2->type, "ext3") &&
 642                             strcmp(inst2->type, "ext4") &&
 643                             strcmp(inst2->type, "ext4dev"))
 644                                 continue;
 645                         /*
 646                          * If we've just started the fsck, wait a tiny
 647                          * bit before sending the kill, to give it
 648                          * time to set up the signal handler
 649                          */
 650                         if (inst2->start_time < time(0)+2) {
 651                                 if (fork() == 0) {
 652                                         sleep(1);
 653                                         kill(inst2->pid, SIGUSR1);
 654                                         exit(0);
 655                                 }
 656                         } else
 657                                 kill(inst2->pid, SIGUSR1);
 658                         inst2->flags |= FLAG_PROGRESS;
 659                         break;
 660                 }
 661         }
 662 ret_inst:
 663         if (prev)
 664                 prev->next = inst->next;
 665         else
 666                 instance_list = inst->next;
 667         if (verbose > 1)
 668                 printf(_("Finished with %s (exit status %d)\n"),
 669                        inst->device, inst->exit_status);
 670         num_running--;
 671         return inst;
 672 }
 673
 674 #define FLAG_WAIT_ALL           0
 675 #define FLAG_WAIT_ATLEAST_ONE   1
 676 /*
 677  * Wait until all executing child processes have exited; return the
 678  * logical OR of all of their exit code values.
 679  */
 680 static int wait_many(int flags)
 681 {
 682         struct fsck_instance *inst;
 683         int     global_status = 0;
 684         int     wait_flags = 0;
 685
 686         while ((inst = wait_one(wait_flags))) {
 687                 global_status |= inst->exit_status;
 688                 free_instance(inst);
 689 #ifdef RANDOM_DEBUG
 690                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 691                         break;
 692 #endif
 693                 if (flags & FLAG_WAIT_ATLEAST_ONE)
 694                         wait_flags = WNOHANG;
 695         }
 696         return global_status;
 697 }
 698
 699 /*
 700  * Run the fsck program on a particular device
 701  *
 702  * If the type is specified using -t, and it isn't prefixed with "no"
 703  * (as in "noext2") and only one filesystem type is specified, then
 704  * use that type regardless of what is specified in /etc/fstab.
 705  *
 706  * If the type isn't specified by the user, then use either the type
 707  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 708  */
 709 static void fsck_device(struct fs_info *fs, int interactive)
 710 {
 711         const char *type;
 712         int retval;
 713
 714         interpret_type(fs);
 715
 716         if (strcmp(fs->type, "auto") != 0)
 717                 type = fs->type;
 718         else if (fstype && strncmp(fstype, "no", 2) &&
 719             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 720             !strchr(fstype, ','))
 721                 type = fstype;
 722         else
 723                 type = DEFAULT_FSTYPE;
 724
 725         num_running++;
 726         retval = execute(type, fs->device, fs->mountpt, interactive);
 727         if (retval) {
 728                 fprintf(stderr, _("%s: Error %d while executing fsck.%s "
 729                         "for %s\n"), progname, retval, type, fs->device);
 730                 num_running--;
 731         }
 732 }
 733
 734
 735 /*
 736  * Deal with the fsck -t argument.
 737  */
 738 static struct fs_type_compile {
 739         char **list;
 740         int *type;
 741         int  negate;
 742 } fs_type_compiled;
 743
 744 #define FS_TYPE_NORMAL  0
 745 #define FS_TYPE_OPT     1
 746 #define FS_TYPE_NEGOPT  2
 747
 748 static const char *fs_type_syntax_error =
 749 N_("Either all or none of the filesystem types passed to -t must be prefixed\n"
 750    "with 'no' or '!'.\n");
 751
 752 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 753 {
 754         char    *cp, *list, *s;
 755         int     num = 2;
 756         int     negate, first_negate = 1;
 757
 758         if (fs_type) {
 759                 for (cp=fs_type; *cp; cp++) {
 760                         if (*cp == ',')
 761                                 num++;
 762                 }
 763         }
 764
 765         cmp->list = malloc(num * sizeof(char *));
 766         cmp->type = malloc(num * sizeof(int));
 767         if (!cmp->list || !cmp->type) {
 768                 fputs(_("Couldn't allocate memory for filesystem types\n"),
 769                       stderr);
 770                 exit(EXIT_ERROR);
 771         }
 772         memset(cmp->list, 0, num * sizeof(char *));
 773         memset(cmp->type, 0, num * sizeof(int));
 774         cmp->negate = 0;
 775
 776         if (!fs_type)
 777                 return;
 778
 779         list = string_copy(fs_type);
 780         num = 0;
 781         s = strtok(list, ",");
 782         while(s) {
 783                 negate = 0;
 784                 if (strncmp(s, "no", 2) == 0) {
 785                         s += 2;
 786                         negate = 1;
 787                 } else if (*s == '!') {
 788                         s++;
 789                         negate = 1;
 790                 }
 791                 if (strcmp(s, "loop") == 0)
 792                         /* loop is really short-hand for opts=loop */
 793                         goto loop_special_case;
 794                 else if (strncmp(s, "opts=", 5) == 0) {
 795                         s += 5;
 796                 loop_special_case:
 797                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 798                 } else {
 799                         if (first_negate) {
 800                                 cmp->negate = negate;
 801                                 first_negate = 0;
 802                         }
 803                         if ((negate && !cmp->negate) ||
 804                             (!negate && cmp->negate)) {
 805                                 fputs(_(fs_type_syntax_error), stderr);
 806                                 exit(EXIT_USAGE);
 807                         }
 808                 }
 809 #if 0
 810                 printf("Adding %s to list (type %d).\n", s, cmp->type[num]);
 811 #endif
 812                 cmp->list[num++] = string_copy(s);
 813                 s = strtok(NULL, ",");
 814         }
 815         free(list);
 816 }
 817
 818 /*
 819  * This function returns true if a particular option appears in a
 820  * comma-delimited options list
 821  */
 822 static int opt_in_list(const char *opt, char *optlist)
 823 {
 824         char    *list, *s;
 825
 826         if (!optlist)
 827                 return 0;
 828         list = string_copy(optlist);
 829
 830         s = strtok(list, ",");
 831         while(s) {
 832                 if (strcmp(s, opt) == 0) {
 833                         free(list);
 834                         return 1;
 835                 }
 836                 s = strtok(NULL, ",");
 837         }
 838         free(list);
 839         return 0;
 840 }
 841
 842 /* See if the filesystem matches the criteria given by the -t option */
 843 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 844 {
 845         int n, ret = 0, checked_type = 0;
 846         char *cp;
 847
 848         if (cmp->list == 0 || cmp->list[0] == 0)
 849                 return 1;
 850
 851         for (n=0; (cp = cmp->list[n]); n++) {
 852                 switch (cmp->type[n]) {
 853                 case FS_TYPE_NORMAL:
 854                         checked_type++;
 855                         if (strcmp(cp, fs->type) == 0) {
 856                                 ret = 1;
 857                         }
 858                         break;
 859                 case FS_TYPE_NEGOPT:
 860                         if (opt_in_list(cp, fs->opts))
 861                                 return 0;
 862                         break;
 863                 case FS_TYPE_OPT:
 864                         if (!opt_in_list(cp, fs->opts))
 865                                 return 0;
 866                         break;
 867                 }
 868         }
 869         if (checked_type == 0)
 870                 return 1;
 871         return (cmp->negate ? !ret : ret);
 872 }
 873
 874 /* Check if we should ignore this filesystem. */
 875 static int ignore(struct fs_info *fs)
 876 {
 877         const char **ip;
 878         int wanted = 0;
 879
 880         /*
 881          * If the pass number is 0, ignore it.
 882          */
 883         if (fs->passno == 0)
 884                 return 1;
 885
 886         /*
 887          * If this is a bind mount, ignore it.
 888          */
 889         if (opt_in_list("bind", fs->opts)) {
 890                 fprintf(stderr,
 891                         _("%s: skipping bad line in /etc/fstab: bind mount with nonzero fsck pass number\n"),
 892                         fs->mountpt);
 893                 return 1;
 894         }
 895
 896         interpret_type(fs);
 897
 898         /*
 899          * If a specific fstype is specified, and it doesn't match,
 900          * ignore it.
 901          */
 902         if (!fs_match(fs, &fs_type_compiled)) return 1;
 903
 904         /* Are we ignoring this type? */
 905         for(ip = ignored_types; *ip; ip++)
 906                 if (strcmp(fs->type, *ip) == 0) return 1;
 907
 908         /* Do we really really want to check this fs? */
 909         for(ip = really_wanted; *ip; ip++)
 910                 if (strcmp(fs->type, *ip) == 0) {
 911                         wanted = 1;
 912                         break;
 913                 }
 914
 915         /* See if the <fsck.fs> program is available. */
 916         if (find_fsck(fs->type) == NULL) {
 917                 if (wanted)
 918                         fprintf(stderr, _("fsck: cannot check %s: fsck.%s not found\n"),
 919                                 fs->device, fs->type);
 920                 return 1;
 921         }
 922
 923         /* We can and want to check this file system type. */
 924         return 0;
 925 }
 926
 927 /*
 928  * Returns TRUE if a partition on the same disk is already being
 929  * checked.
 930  */
 931 static int device_already_active(char *device)
 932 {
 933         struct fsck_instance *inst;
 934         char *base;
 935
 936         if (force_all_parallel)
 937                 return 0;
 938
 939 #ifdef BASE_MD
 940         /* Don't check a soft raid disk with any other disk */
 941         if (instance_list &&
 942             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
 943              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
 944                 return 1;
 945 #endif
 946
 947         base = base_device(device);
 948         /*
 949          * If we don't know the base device, assume that the device is
 950          * already active if there are any fsck instances running.
 951          */
 952         if (!base)
 953                 return (instance_list != 0);
 954         for (inst = instance_list; inst; inst = inst->next) {
 955                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
 956                         free(base);
 957                         return 1;
 958                 }
 959         }
 960         free(base);
 961         return 0;
 962 }
 963
 964 /* Check all file systems, using the /etc/fstab table. */
 965 static int check_all(NOARGS)
 966 {
 967         struct fs_info *fs = NULL;
 968         int status = EXIT_OK;
 969         int not_done_yet = 1;
 970         int passno = 1;
 971         int pass_done;
 972
 973         if (verbose)
 974                 fputs(_("Checking all file systems.\n"), stdout);
 975
 976         /*
 977          * Do an initial scan over the filesystem; mark filesystems
 978          * which should be ignored as done, and resolve any "auto"
 979          * filesystem types (done as a side-effect of calling ignore()).
 980          */
 981         for (fs = filesys_info; fs; fs = fs->next) {
 982                 if (ignore(fs))
 983                         fs->flags |= FLAG_DONE;
 984         }
 985
 986         /*
 987          * Find and check the root filesystem.
 988          */
 989         if (!parallel_root) {
 990                 for (fs = filesys_info; fs; fs = fs->next) {
 991                         if (!strcmp(fs->mountpt, "/"))
 992                                 break;
 993                 }
 994                 if (fs) {
 995                         if (!skip_root && !ignore(fs) &&
 996                             !(ignore_mounted && is_mounted(fs->device))) {
 997                                 fsck_device(fs, 1);
 998                                 status |= wait_many(FLAG_WAIT_ALL);
 999                                 if (status > EXIT_NONDESTRUCT)
1000                                         return status;
1001                         }
1002                         fs->flags |= FLAG_DONE;
1003                 }
1004         }
1005         /*
1006          * This is for the bone-headed user who enters the root
1007          * filesystem twice.  Skip root will skip all root entries.
1008          */
1009         if (skip_root)
1010                 for (fs = filesys_info; fs; fs = fs->next)
1011                         if (!strcmp(fs->mountpt, "/"))
1012                                 fs->flags |= FLAG_DONE;
1013
1014         while (not_done_yet) {
1015                 not_done_yet = 0;
1016                 pass_done = 1;
1017
1018                 for (fs = filesys_info; fs; fs = fs->next) {
1019                         if (cancel_requested)
1020                                 break;
1021                         if (fs->flags & FLAG_DONE)
1022                                 continue;
1023                         /*
1024                          * If the filesystem's pass number is higher
1025                          * than the current pass number, then we don't
1026                          * do it yet.
1027                          */
1028                         if (fs->passno > passno) {
1029                                 not_done_yet++;
1030                                 continue;
1031                         }
1032                         if (ignore_mounted && is_mounted(fs->device)) {
1033                                 fs->flags |= FLAG_DONE;
1034                                 continue;
1035                         }
1036                         /*
1037                          * If a filesystem on a particular device has
1038                          * already been spawned, then we need to defer
1039                          * this to another pass.
1040                          */
1041                         if (device_already_active(fs->device)) {
1042                                 pass_done = 0;
1043                                 continue;
1044                         }
1045                         /*
1046                          * Spawn off the fsck process
1047                          */
1048                         fsck_device(fs, serialize);
1049                         fs->flags |= FLAG_DONE;
1050
1051                         /*
1052                          * Only do one filesystem at a time, or if we
1053                          * have a limit on the number of fsck's extant
1054                          * at one time, apply that limit.
1055                          */
1056                         if (serialize ||
1057                             (max_running && (num_running >= max_running))) {
1058                                 pass_done = 0;
1059                                 break;
1060                         }
1061                 }
1062                 if (cancel_requested)
1063                         break;
1064                 if (verbose > 1)
1065                         printf(_("--waiting-- (pass %d)\n"), passno);
1066                 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1067                                     FLAG_WAIT_ATLEAST_ONE);
1068                 if (pass_done) {
1069                         if (verbose > 1)
1070                                 printf("----------------------------------\n");
1071                         passno++;
1072                 } else
1073                         not_done_yet++;
1074         }
1075         if (cancel_requested && !kill_sent) {
1076                 kill_all(SIGTERM);
1077                 kill_sent++;
1078         }
1079         status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1080         return status;
1081 }
1082
1083 static void usage(NOARGS)
1084 {
1085         fputs(_("Usage: fsck [-AMNPRTV] [ -C [ fd ] ] [-t fstype] [fs-options] [filesys ...]\n"), stderr);
1086         exit(EXIT_USAGE);
1087 }
1088
1089 #ifdef HAVE_SIGNAL_H
1090 static void signal_cancel(int sig FSCK_ATTR((unused)))
1091 {
1092         cancel_requested++;
1093 }
1094 #endif
1095
1096 static void PRS(int argc, char *argv[])
1097 {
1098         int     i, j;
1099         char    *arg, *dev, *tmp = 0;
1100         char    options[128];
1101         int     opt = 0;
1102         int     opts_for_fsck = 0;
1103 #ifdef HAVE_SIGNAL_H
1104         struct sigaction        sa;
1105
1106         /*
1107          * Set up signal action
1108          */
1109         memset(&sa, 0, sizeof(struct sigaction));
1110         sa.sa_handler = signal_cancel;
1111         sigaction(SIGINT, &sa, 0);
1112         sigaction(SIGTERM, &sa, 0);
1113 #endif
1114
1115         num_devices = 0;
1116         num_args = 0;
1117         instance_list = 0;
1118
1119         progname = argv[0];
1120
1121         for (i=1; i < argc; i++) {
1122                 arg = argv[i];
1123                 if (!arg)
1124                         continue;
1125                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1126                         if (num_devices >= MAX_DEVICES) {
1127                                 fprintf(stderr, _("%s: too many devices\n"),
1128                                         progname);
1129                                 exit(EXIT_ERROR);
1130                         }
1131                         dev = blkid_get_devname(cache, arg, NULL);
1132                         if (!dev && strchr(arg, '=')) {
1133                                 /*
1134                                  * Check to see if we failed because
1135                                  * /proc/partitions isn't found.
1136                                  */
1137                                 if (access("/proc/partitions", R_OK) < 0) {
1138                                         fprintf(stderr, "Couldn't open /proc/partitions: %s\n",
1139                                                 strerror(errno));
1140                                         fprintf(stderr, "Is /proc mounted?\n");
1141                                         exit(EXIT_ERROR);
1142                                 }
1143                                 /*
1144                                  * Check to see if this is because
1145                                  * we're not running as root
1146                                  */
1147                                 if (geteuid())
1148                                         fprintf(stderr,
1149                 "Must be root to scan for matching filesystems: %s\n", arg);
1150                                 else
1151                                         fprintf(stderr,
1152                 "Couldn't find matching filesystem: %s\n", arg);
1153                                 exit(EXIT_ERROR);
1154                         }
1155                         devices[num_devices++] = dev ? dev : string_copy(arg);
1156                         continue;
1157                 }
1158                 if (arg[0] != '-' || opts_for_fsck) {
1159                         if (num_args >= MAX_ARGS) {
1160                                 fprintf(stderr, _("%s: too many arguments\n"),
1161                                         progname);
1162                                 exit(EXIT_ERROR);
1163                         }
1164                         args[num_args++] = string_copy(arg);
1165                         continue;
1166                 }
1167                 for (j=1; arg[j]; j++) {
1168                         if (opts_for_fsck) {
1169                                 options[++opt] = arg[j];
1170                                 continue;
1171                         }
1172                         switch (arg[j]) {
1173                         case 'A':
1174                                 doall++;
1175                                 break;
1176                         case 'C':
1177                                 progress++;
1178                                 if (arg[j+1]) {
1179                                         progress_fd = string_to_int(arg+j+1);
1180                                         if (progress_fd < 0)
1181                                                 progress_fd = 0;
1182                                         else
1183                                                 goto next_arg;
1184                                 } else if (argc > i + 1 &&
1185                                            argv[i + 1][0] != '-') {
1186                                         progress_fd = string_to_int(argv[i]);
1187                                         if (progress_fd < 0)
1188                                                 progress_fd = 0;
1189                                         else {
1190                                                 ++i;
1191                                                 goto next_arg;
1192                                         }
1193                                 }
1194                                 break;
1195                         case 'V':
1196                                 verbose++;
1197                                 break;
1198                         case 'N':
1199                                 noexecute++;
1200                                 break;
1201                         case 'R':
1202                                 skip_root++;
1203                                 break;
1204                         case 'T':
1205                                 notitle++;
1206                                 break;
1207                         case 'M':
1208                                 ignore_mounted++;
1209                                 break;
1210                         case 'P':
1211                                 parallel_root++;
1212                                 break;
1213                         case 's':
1214                                 serialize++;
1215                                 break;
1216                         case 't':
1217                                 tmp = 0;
1218                                 if (fstype)
1219                                         usage();
1220                                 if (arg[j+1])
1221                                         tmp = arg+j+1;
1222                                 else if ((i+1) < argc)
1223                                         tmp = argv[++i];
1224                                 else
1225                                         usage();
1226                                 fstype = string_copy(tmp);
1227                                 compile_fs_type(fstype, &fs_type_compiled);
1228                                 goto next_arg;
1229                         case '-':
1230                                 opts_for_fsck++;
1231                                 break;
1232                         case '?':
1233                                 usage();
1234                                 break;
1235                         default:
1236                                 options[++opt] = arg[j];
1237                                 break;
1238                         }
1239                 }
1240         next_arg:
1241                 if (opt) {
1242                         options[0] = '-';
1243                         options[++opt] = '\0';
1244                         if (num_args >= MAX_ARGS) {
1245                                 fprintf(stderr,
1246                                         _("%s: too many arguments\n"),
1247                                         progname);
1248                                 exit(EXIT_ERROR);
1249                         }
1250                         args[num_args++] = string_copy(options);
1251                         opt = 0;
1252                 }
1253         }
1254         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1255                 force_all_parallel++;
1256         if ((tmp = getenv("FSCK_MAX_INST")))
1257             max_running = atoi(tmp);
1258 }
1259
1260 int main(int argc, char *argv[])
1261 {
1262         int i, status = 0;
1263         int interactive = 0;
1264         char *oldpath = getenv("PATH");
1265         const char *fstab;
1266         struct fs_info *fs;
1267
1268         setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1269         setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1270
1271 #ifdef ENABLE_NLS
1272         setlocale(LC_MESSAGES, "");
1273         setlocale(LC_CTYPE, "");
1274         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
1275         textdomain(NLS_CAT_NAME);
1276 #endif
1277         blkid_get_cache(&cache, NULL);
1278         PRS(argc, argv);
1279
1280         if (!notitle)
1281                 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1282
1283         fstab = getenv("FSTAB_FILE");
1284         if (!fstab)
1285                 fstab = _PATH_MNTTAB;
1286         load_fs_info(fstab);
1287
1288         /* Update our search path to include uncommon directories. */
1289         if (oldpath) {
1290                 fsck_path = malloc (strlen (fsck_prefix_path) + 1 +
1291                                     strlen (oldpath) + 1);
1292                 if (!fsck_path) {
1293                         fprintf(stderr, "%s: Unable to allocate memory for fsck_path\n", progname);
1294                         exit(EXIT_ERROR);
1295                 }
1296                 strcpy (fsck_path, fsck_prefix_path);
1297                 strcat (fsck_path, ":");
1298                 strcat (fsck_path, oldpath);
1299         } else {
1300                 fsck_path = string_copy(fsck_prefix_path);
1301         }
1302
1303         if ((num_devices == 1) || (serialize))
1304                 interactive = 1;
1305
1306         /* If -A was specified ("check all"), do that! */
1307         if (doall)
1308                 return check_all();
1309
1310         if (num_devices == 0) {
1311                 serialize++;
1312                 interactive++;
1313                 return check_all();
1314         }
1315         for (i = 0 ; i < num_devices; i++) {
1316                 if (cancel_requested) {
1317                         if (!kill_sent) {
1318                                 kill_all(SIGTERM);
1319                                 kill_sent++;
1320                         }
1321                         break;
1322                 }
1323                 fs = lookup(devices[i]);
1324                 if (!fs) {
1325                         fs = create_fs_device(devices[i], 0, "auto",
1326                                               0, -1, -1);
1327                         if (!fs)
1328                                 continue;
1329                 }
1330                 if (ignore_mounted && is_mounted(fs->device))
1331                         continue;
1332                 fsck_device(fs, interactive);
1333                 if (serialize ||
1334                     (max_running && (num_running >= max_running))) {
1335                         struct fsck_instance *inst;
1336
1337                         inst = wait_one(0);
1338                         if (inst) {
1339                                 status |= inst->exit_status;
1340                                 free_instance(inst);
1341                         }
1342                         if (verbose > 1)
1343                                 printf("----------------------------------\n");
1344                 }
1345         }
1346         status |= wait_many(FLAG_WAIT_ALL);
1347         free(fsck_path);
1348         blkid_put_cache(cache);
1349         return status;
1350 }