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