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