e2fsprogs/fsck.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * pfsck --- A generic, parallelizing front-end for the fsck program.
   4  * It will automatically try to run fsck programs in parallel if the
   5  * devices are on separate spindles.  It is based on the same ideas as
   6  * the generic front end for fsck by David Engel and Fred van Kempen,
   7  * but it has been completely rewritten from scratch to support
   8  * parallel execution.
   9  *
  10  * Written by Theodore Ts'o, <tytso@mit.edu>
  11  *
  12  * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
  13  *   o Changed -t fstype to behave like with mount when -A (all file
  14  *     systems) or -M (like mount) is specified.
  15  *   o fsck looks if it can find the fsck.type program to decide
  16  *     if it should ignore the fs type. This way more fsck programs
  17  *     can be added without changing this front-end.
  18  *   o -R flag skip root file system.
  19  *
  20  * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
  21  *      2001, 2002, 2003, 2004, 2005 by  Theodore Ts'o.
  22  *
  23  * %Begin-Header%
  24  * This file may be redistributed under the terms of the GNU Public
  25  * License.
  26  * %End-Header%
  27  */
  28
  29 #include <sys/types.h>
  30 #include <sys/wait.h>
  31 #include <sys/stat.h>
  32 #include <limits.h>
  33 #include <stdio.h>
  34 #include <ctype.h>
  35 #include <string.h>
  36 #include <time.h>
  37 #include <stdlib.h>
  38 #include <errno.h>
  39 #include <paths.h>
  40 #include <unistd.h>
  41 #include <errno.h>
  42 #include <signal.h>
  43
  44 #include "fsck.h"
  45 #include "blkid/blkid.h"
  46
  47 #include "e2fsbb.h"
  48
  49 #include "busybox.h"
  50
  51 #ifndef _PATH_MNTTAB
  52 #define _PATH_MNTTAB    "/etc/fstab"
  53 #endif
  54
  55 /*
  56  * fsck.h
  57  */
  58
  59 #ifndef DEFAULT_FSTYPE
  60 #define DEFAULT_FSTYPE  "ext2"
  61 #endif
  62
  63 #define MAX_DEVICES 32
  64 #define MAX_ARGS 32
  65
  66 /*
  67  * Internal structure for mount tabel entries.
  68  */
  69
  70 struct fs_info {
  71         char  *device;
  72         char  *mountpt;
  73         char  *type;
  74         char  *opts;
  75         int   freq;
  76         int   passno;
  77         int   flags;
  78         struct fs_info *next;
  79 };
  80
  81 #define FLAG_DONE 1
  82 #define FLAG_PROGRESS 2
  83
  84 /*
  85  * Structure to allow exit codes to be stored
  86  */
  87 struct fsck_instance {
  88         int     pid;
  89         int     flags;
  90         int     exit_status;
  91         time_t  start_time;
  92         char *  prog;
  93         char *  type;
  94         char *  device;
  95         char *  base_device;
  96         struct fsck_instance *next;
  97 };
  98
  99 /*
 100  * base_device.c
 101  *
 102  * Return the "base device" given a particular device; this is used to
 103  * assure that we only fsck one partition on a particular drive at any
 104  * one time.  Otherwise, the disk heads will be seeking all over the
 105  * place.  If the base device cannot be determined, return NULL.
 106  *
 107  * The base_device() function returns an allocated string which must
 108  * be freed.
 109  *
 110  */
 111
 112
 113 #ifdef CONFIG_FEATURE_DEVFS
 114 /*
 115  * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
 116  * pathames.
 117  */
 118 static const char * const devfs_hier[] = {
 119         "host", "bus", "target", "lun", 0
 120 };
 121 #endif
 122
 123 static char *base_device(const char *device)
 124 {
 125         char *str, *cp;
 126 #ifdef CONFIG_FEATURE_DEVFS
 127         const char * const *hier;
 128         const char *disk;
 129         int len;
 130 #endif
 131
 132         cp = str = xstrdup(device);
 133
 134         /* Skip over /dev/; if it's not present, give up. */
 135         if (strncmp(cp, "/dev/", 5) != 0)
 136                 goto errout;
 137         cp += 5;
 138
 139         /*
 140          * For md devices, we treat them all as if they were all
 141          * on one disk, since we don't know how to parallelize them.
 142          */
 143         if (cp[0] == 'm' && cp[1] == 'd') {
 144                 *(cp+2) = 0;
 145                 return str;
 146         }
 147
 148         /* Handle DAC 960 devices */
 149         if (strncmp(cp, "rd/", 3) == 0) {
 150                 cp += 3;
 151                 if (cp[0] != 'c' || cp[2] != 'd' ||
 152                     !isdigit(cp[1]) || !isdigit(cp[3]))
 153                         goto errout;
 154                 *(cp+4) = 0;
 155                 return str;
 156         }
 157
 158         /* Now let's handle /dev/hd* and /dev/sd* devices.... */
 159         if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) {
 160                 cp += 2;
 161                 /* If there's a single number after /dev/hd, skip it */
 162                 if (isdigit(*cp))
 163                         cp++;
 164                 /* What follows must be an alpha char, or give up */
 165                 if (!isalpha(*cp))
 166                         goto errout;
 167                 *(cp + 1) = 0;
 168                 return str;
 169         }
 170
 171 #ifdef CONFIG_FEATURE_DEVFS
 172         /* Now let's handle devfs (ugh) names */
 173         len = 0;
 174         if (strncmp(cp, "ide/", 4) == 0)
 175                 len = 4;
 176         if (strncmp(cp, "scsi/", 5) == 0)
 177                 len = 5;
 178         if (len) {
 179                 cp += len;
 180                 /*
 181                  * Now we proceed down the expected devfs hierarchy.
 182                  * i.e., .../host1/bus2/target3/lun4/...
 183                  * If we don't find the expected token, followed by
 184                  * some number of digits at each level, abort.
 185                  */
 186                 for (hier = devfs_hier; *hier; hier++) {
 187                         len = strlen(*hier);
 188                         if (strncmp(cp, *hier, len) != 0)
 189                                 goto errout;
 190                         cp += len;
 191                         while (*cp != '/' && *cp != 0) {
 192                                 if (!isdigit(*cp))
 193                                         goto errout;
 194                                 cp++;
 195                         }
 196                         cp++;
 197                 }
 198                 *(cp - 1) = 0;
 199                 return str;
 200         }
 201
 202         /* Now handle devfs /dev/disc or /dev/disk names */
 203         disk = 0;
 204         if (strncmp(cp, "discs/", 6) == 0)
 205                 disk = "disc";
 206         else if (strncmp(cp, "disks/", 6) == 0)
 207                 disk = "disk";
 208         if (disk) {
 209                 cp += 6;
 210                 if (strncmp(cp, disk, 4) != 0)
 211                         goto errout;
 212                 cp += 4;
 213                 while (*cp != '/' && *cp != 0) {
 214                         if (!isdigit(*cp))
 215                                 goto errout;
 216                         cp++;
 217                 }
 218                 *cp = 0;
 219                 return str;
 220         }
 221 #endif
 222
 223 errout:
 224         free(str);
 225         return NULL;
 226 }
 227
 228
 229 static const char * const ignored_types[] = {
 230         "ignore",
 231         "iso9660",
 232         "nfs",
 233         "proc",
 234         "sw",
 235         "swap",
 236         "tmpfs",
 237         "devpts",
 238         NULL
 239 };
 240
 241 static const char * const really_wanted[] = {
 242         "minix",
 243         "ext2",
 244         "ext3",
 245         "jfs",
 246         "reiserfs",
 247         "xiafs",
 248         "xfs",
 249         NULL
 250 };
 251
 252 #define BASE_MD "/dev/md"
 253
 254 /*
 255  * Global variables for options
 256  */
 257 static char *devices[MAX_DEVICES];
 258 static char *args[MAX_ARGS];
 259 static int num_devices, num_args;
 260
 261 static int verbose;
 262 static int doall;
 263 static int noexecute;
 264 static int serialize;
 265 static int skip_root;
 266 static int like_mount;
 267 static int notitle;
 268 static int parallel_root;
 269 static int progress;
 270 static int progress_fd;
 271 static int force_all_parallel;
 272 static int num_running;
 273 static int max_running;
 274 static volatile int cancel_requested;
 275 static int kill_sent;
 276 static char *fstype;
 277 static struct fs_info *filesys_info, *filesys_last;
 278 static struct fsck_instance *instance_list;
 279 static char *fsck_path;
 280 static blkid_cache cache;
 281
 282 static char *string_copy(const char *s)
 283 {
 284         char    *ret;
 285
 286         if (!s)
 287                 return 0;
 288         ret = strdup(s);
 289         return ret;
 290 }
 291
 292 static int string_to_int(const char *s)
 293 {
 294         long l;
 295         char *p;
 296
 297         l = strtol(s, &p, 0);
 298         if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
 299                 return -1;
 300         else
 301                 return (int) l;
 302 }
 303
 304 static char *skip_over_blank(char *cp)
 305 {
 306         while (*cp && isspace(*cp))
 307                 cp++;
 308         return cp;
 309 }
 310
 311 static char *skip_over_word(char *cp)
 312 {
 313         while (*cp && !isspace(*cp))
 314                 cp++;
 315         return cp;
 316 }
 317
 318 static void strip_line(char *line)
 319 {
 320         char    *p;
 321
 322         while (*line) {
 323                 p = line + strlen(line) - 1;
 324                 if ((*p == '\n') || (*p == '\r'))
 325                         *p = 0;
 326                 else
 327                         break;
 328         }
 329 }
 330
 331 static char *parse_word(char **buf)
 332 {
 333         char *word, *next;
 334
 335         word = *buf;
 336         if (*word == 0)
 337                 return 0;
 338
 339         word = skip_over_blank(word);
 340         next = skip_over_word(word);
 341         if (*next)
 342                 *next++ = 0;
 343         *buf = next;
 344         return word;
 345 }
 346
 347 static void parse_escape(char *word)
 348 {
 349         char    *q, c;
 350         const char *p;
 351
 352         if (!word)
 353                 return;
 354
 355         for (p = q = word; *p; q++) {
 356                 c = *p++;
 357                 if (c != '\\') {
 358                         *q = c;
 359                 } else {
 360                         *q = bb_process_escape_sequence(&p);
 361                 }
 362         }
 363         *q = 0;
 364 }
 365
 366 static void free_instance(struct fsck_instance *i)
 367 {
 368         if (i->prog)
 369                 free(i->prog);
 370         if (i->device)
 371                 free(i->device);
 372         if (i->base_device)
 373                 free(i->base_device);
 374         free(i);
 375         return;
 376 }
 377
 378 static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
 379                                         const char *type, const char *opts,
 380                                         int freq, int passno)
 381 {
 382         struct fs_info *fs;
 383
 384         if (!(fs = malloc(sizeof(struct fs_info))))
 385                 return NULL;
 386
 387         fs->device = string_copy(device);
 388         fs->mountpt = string_copy(mntpnt);
 389         fs->type = string_copy(type);
 390         fs->opts = string_copy(opts ? opts : "");
 391         fs->freq = freq;
 392         fs->passno = passno;
 393         fs->flags = 0;
 394         fs->next = NULL;
 395
 396         if (!filesys_info)
 397                 filesys_info = fs;
 398         else
 399                 filesys_last->next = fs;
 400         filesys_last = fs;
 401
 402         return fs;
 403 }
 404
 405
 406
 407 static int parse_fstab_line(char *line, struct fs_info **ret_fs)
 408 {
 409         char    *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
 410         struct fs_info *fs;
 411
 412         *ret_fs = 0;
 413         strip_line(line);
 414         if ((cp = strchr(line, '#')))
 415                 *cp = 0;        /* Ignore everything after the comment char */
 416         cp = line;
 417
 418         device = parse_word(&cp);
 419         mntpnt = parse_word(&cp);
 420         type = parse_word(&cp);
 421         opts = parse_word(&cp);
 422         freq = parse_word(&cp);
 423         passno = parse_word(&cp);
 424
 425         if (!device)
 426                 return 0;       /* Allow blank lines */
 427
 428         if (!mntpnt || !type)
 429                 return -1;
 430
 431         parse_escape(device);
 432         parse_escape(mntpnt);
 433         parse_escape(type);
 434         parse_escape(opts);
 435         parse_escape(freq);
 436         parse_escape(passno);
 437
 438         dev = blkid_get_devname(cache, device, NULL);
 439         if (dev)
 440                 device = dev;
 441
 442         if (strchr(type, ','))
 443                 type = 0;
 444
 445         fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
 446                               freq ? atoi(freq) : -1,
 447                               passno ? atoi(passno) : -1);
 448         if (dev)
 449                 free(dev);
 450
 451         if (!fs)
 452                 return -1;
 453         *ret_fs = fs;
 454         return 0;
 455 }
 456
 457 static void interpret_type(struct fs_info *fs)
 458 {
 459         char    *t;
 460
 461         if (strcmp(fs->type, "auto") != 0)
 462                 return;
 463         t = blkid_get_tag_value(cache, "TYPE", fs->device);
 464         if (t) {
 465                 free(fs->type);
 466                 fs->type = t;
 467         }
 468 }
 469
 470 /*
 471  * Load the filesystem database from /etc/fstab
 472  */
 473 static void load_fs_info(const char *filename)
 474 {
 475         FILE    *f;
 476         char    buf[1024];
 477         int     lineno = 0;
 478         int     old_fstab = 1;
 479         struct fs_info *fs;
 480
 481         if ((f = fopen(filename, "r")) == NULL) {
 482                 bb_perror_msg("WARNING: cannot open %s", filename);
 483                 return;
 484         }
 485         while (!feof(f)) {
 486                 lineno++;
 487                 if (!fgets(buf, sizeof(buf), f))
 488                         break;
 489                 buf[sizeof(buf)-1] = 0;
 490                 if (parse_fstab_line(buf, &fs) < 0) {
 491                         bb_error_msg("WARNING: bad format "
 492                                 "on line %d of %s\n", lineno, filename);
 493                         continue;
 494                 }
 495                 if (!fs)
 496                         continue;
 497                 if (fs->passno < 0)
 498                         fs->passno = 0;
 499                 else
 500                         old_fstab = 0;
 501         }
 502
 503         fclose(f);
 504
 505         if (old_fstab) {
 506                 fputs("\007\007\007"
 507                 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
 508                 "       field.  I will kludge around things for you, but you\n"
 509                 "       should fix your /etc/fstab file as soon as you can.\n\n", stderr);
 510
 511                 for (fs = filesys_info; fs; fs = fs->next) {
 512                         fs->passno = 1;
 513                 }
 514         }
 515 }
 516
 517 /* Lookup filesys in /etc/fstab and return the corresponding entry. */
 518 static struct fs_info *lookup(char *filesys)
 519 {
 520         struct fs_info *fs;
 521
 522         /* No filesys name given. */
 523         if (filesys == NULL)
 524                 return NULL;
 525
 526         for (fs = filesys_info; fs; fs = fs->next) {
 527                 if (!strcmp(filesys, fs->device) ||
 528                     (fs->mountpt && !strcmp(filesys, fs->mountpt)))
 529                         break;
 530         }
 531
 532         return fs;
 533 }
 534
 535 /* Find fsck program for a given fs type. */
 536 static char *find_fsck(char *type)
 537 {
 538   char *s;
 539   const char *tpl;
 540   char *p = string_copy(fsck_path);
 541   struct stat st;
 542
 543   /* Are we looking for a program or just a type? */
 544   tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
 545
 546   for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
 547         s = xasprintf(tpl, s, type);
 548         if (stat(s, &st) == 0) break;
 549         free(s);
 550   }
 551   free(p);
 552   return(s);
 553 }
 554
 555 static int progress_active(void)
 556 {
 557         struct fsck_instance *inst;
 558
 559         for (inst = instance_list; inst; inst = inst->next) {
 560                 if (inst->flags & FLAG_DONE)
 561                         continue;
 562                 if (inst->flags & FLAG_PROGRESS)
 563                         return 1;
 564         }
 565         return 0;
 566 }
 567
 568 /*
 569  * Execute a particular fsck program, and link it into the list of
 570  * child processes we are waiting for.
 571  */
 572 static int execute(const char *type, const char *device, const char *mntpt,
 573                    int interactive)
 574 {
 575         char *s, *argv[80];
 576         char *prog;
 577         int  argc, i;
 578         struct fsck_instance *inst, *p;
 579         pid_t   pid;
 580
 581         inst = malloc(sizeof(struct fsck_instance));
 582         if (!inst)
 583                 return ENOMEM;
 584         memset(inst, 0, sizeof(struct fsck_instance));
 585
 586         prog = xasprintf("fsck.%s", type);
 587         argv[0] = prog;
 588         argc = 1;
 589
 590         for (i=0; i <num_args; i++)
 591                 argv[argc++] = string_copy(args[i]);
 592
 593         if (progress && !progress_active()) {
 594                 if ((strcmp(type, "ext2") == 0) ||
 595                     (strcmp(type, "ext3") == 0)) {
 596                         char tmp[80];
 597                         snprintf(tmp, 80, "-C%d", progress_fd);
 598                         argv[argc++] = string_copy(tmp);
 599                         inst->flags |= FLAG_PROGRESS;
 600                 }
 601         }
 602
 603         argv[argc++] = string_copy(device);
 604         argv[argc] = 0;
 605
 606         s = find_fsck(prog);
 607         if (s == NULL) {
 608                 bb_error_msg("%s: not found", prog);
 609                 return ENOENT;
 610         }
 611
 612         if (verbose || noexecute) {
 613                 printf("[%s (%d) -- %s] ", s, num_running,
 614                        mntpt ? mntpt : device);
 615                 for (i=0; i < argc; i++)
 616                         printf("%s ", argv[i]);
 617                 puts("");
 618         }
 619
 620         /* Fork and execute the correct program. */
 621         if (noexecute)
 622                 pid = -1;
 623         else if ((pid = fork()) < 0) {
 624                 perror("fork");
 625                 return errno;
 626         } else if (pid == 0) {
 627                 if (!interactive)
 628                         close(0);
 629                 (void) execv(s, argv);
 630                 bb_perror_msg_and_die("%s", argv[0]);
 631         }
 632
 633         for (i = 1; i < argc; i++)
 634                 free(argv[i]);
 635
 636         free(s);
 637         inst->pid = pid;
 638         inst->prog = prog;
 639         inst->type = string_copy(type);
 640         inst->device = string_copy(device);
 641         inst->base_device = base_device(device);
 642         inst->start_time = time(0);
 643         inst->next = NULL;
 644
 645         /*
 646          * Find the end of the list, so we add the instance on at the end.
 647          */
 648         for (p = instance_list; p && p->next; p = p->next);
 649
 650         if (p)
 651                 p->next = inst;
 652         else
 653                 instance_list = inst;
 654
 655         return 0;
 656 }
 657
 658 /*
 659  * Send a signal to all outstanding fsck child processes
 660  */
 661 static int kill_all(int signum)
 662 {
 663         struct fsck_instance *inst;
 664         int     n = 0;
 665
 666         for (inst = instance_list; inst; inst = inst->next) {
 667                 if (inst->flags & FLAG_DONE)
 668                         continue;
 669                 kill(inst->pid, signum);
 670                 n++;
 671         }
 672         return n;
 673 }
 674
 675 /*
 676  * Wait for one child process to exit; when it does, unlink it from
 677  * the list of executing child processes, and return it.
 678  */
 679 static struct fsck_instance *wait_one(int flags)
 680 {
 681         int     status;
 682         int     sig;
 683         struct fsck_instance *inst, *inst2, *prev;
 684         pid_t   pid;
 685
 686         if (!instance_list)
 687                 return NULL;
 688
 689         if (noexecute) {
 690                 inst = instance_list;
 691                 prev = 0;
 692 #ifdef RANDOM_DEBUG
 693                 while (inst->next && (random() & 1)) {
 694                         prev = inst;
 695                         inst = inst->next;
 696                 }
 697 #endif
 698                 inst->exit_status = 0;
 699                 goto ret_inst;
 700         }
 701
 702         /*
 703          * gcc -Wall fails saving throw against stupidity
 704          * (inst and prev are thought to be uninitialized variables)
 705          */
 706         inst = prev = NULL;
 707
 708         do {
 709                 pid = waitpid(-1, &status, flags);
 710                 if (cancel_requested && !kill_sent) {
 711                         kill_all(SIGTERM);
 712                         kill_sent++;
 713                 }
 714                 if ((pid == 0) && (flags & WNOHANG))
 715                         return NULL;
 716                 if (pid < 0) {
 717                         if ((errno == EINTR) || (errno == EAGAIN))
 718                                 continue;
 719                         if (errno == ECHILD) {
 720                                 bb_error_msg("wait: no more child process?!?");
 721                                 return NULL;
 722                         }
 723                         perror("wait");
 724                         continue;
 725                 }
 726                 for (prev = 0, inst = instance_list;
 727                      inst;
 728                      prev = inst, inst = inst->next) {
 729                         if (inst->pid == pid)
 730                                 break;
 731                 }
 732         } while (!inst);
 733
 734         if (WIFEXITED(status))
 735                 status = WEXITSTATUS(status);
 736         else if (WIFSIGNALED(status)) {
 737                 sig = WTERMSIG(status);
 738                 if (sig == SIGINT) {
 739                         status = EXIT_UNCORRECTED;
 740                 } else {
 741                         printf("Warning... %s for device %s exited "
 742                                "with signal %d.\n",
 743                                inst->prog, inst->device, sig);
 744                         status = EXIT_ERROR;
 745                 }
 746         } else {
 747                 printf("%s %s: status is %x, should never happen.\n",
 748                        inst->prog, inst->device, status);
 749                 status = EXIT_ERROR;
 750         }
 751         inst->exit_status = status;
 752         if (progress && (inst->flags & FLAG_PROGRESS) &&
 753             !progress_active()) {
 754                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 755                         if (inst2->flags & FLAG_DONE)
 756                                 continue;
 757                         if (strcmp(inst2->type, "ext2") &&
 758                             strcmp(inst2->type, "ext3"))
 759                                 continue;
 760                         /*
 761                          * If we've just started the fsck, wait a tiny
 762                          * bit before sending the kill, to give it
 763                          * time to set up the signal handler
 764                          */
 765                         if (inst2->start_time < time(0)+2) {
 766                                 if (fork() == 0) {
 767                                         sleep(1);
 768                                         kill(inst2->pid, SIGUSR1);
 769                                         exit(0);
 770                                 }
 771                         } else
 772                                 kill(inst2->pid, SIGUSR1);
 773                         inst2->flags |= FLAG_PROGRESS;
 774                         break;
 775                 }
 776         }
 777 ret_inst:
 778         if (prev)
 779                 prev->next = inst->next;
 780         else
 781                 instance_list = inst->next;
 782         if (verbose > 1)
 783                 printf("Finished with %s (exit status %d)\n",
 784                        inst->device, inst->exit_status);
 785         num_running--;
 786         return inst;
 787 }
 788
 789 #define FLAG_WAIT_ALL           0
 790 #define FLAG_WAIT_ATLEAST_ONE   1
 791 /*
 792  * Wait until all executing child processes have exited; return the
 793  * logical OR of all of their exit code values.
 794  */
 795 static int wait_many(int flags)
 796 {
 797         struct fsck_instance *inst;
 798         int     global_status = 0;
 799         int     wait_flags = 0;
 800
 801         while ((inst = wait_one(wait_flags))) {
 802                 global_status |= inst->exit_status;
 803                 free_instance(inst);
 804 #ifdef RANDOM_DEBUG
 805                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 806                         break;
 807 #endif
 808                 if (flags & FLAG_WAIT_ATLEAST_ONE)
 809                         wait_flags = WNOHANG;
 810         }
 811         return global_status;
 812 }
 813
 814 /*
 815  * Run the fsck program on a particular device
 816  *
 817  * If the type is specified using -t, and it isn't prefixed with "no"
 818  * (as in "noext2") and only one filesystem type is specified, then
 819  * use that type regardless of what is specified in /etc/fstab.
 820  *
 821  * If the type isn't specified by the user, then use either the type
 822  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 823  */
 824 static void fsck_device(struct fs_info *fs, int interactive)
 825 {
 826         const char *type;
 827         int retval;
 828
 829         interpret_type(fs);
 830
 831         if (strcmp(fs->type, "auto") != 0)
 832                 type = fs->type;
 833         else if (fstype && strncmp(fstype, "no", 2) &&
 834             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 835             !strchr(fstype, ','))
 836                 type = fstype;
 837         else
 838                 type = DEFAULT_FSTYPE;
 839
 840         num_running++;
 841         retval = execute(type, fs->device, fs->mountpt, interactive);
 842         if (retval) {
 843                 bb_error_msg("error %d while executing fsck.%s for %s",
 844                                                 retval, type, fs->device);
 845                 num_running--;
 846         }
 847 }
 848
 849
 850 /*
 851  * Deal with the fsck -t argument.
 852  */
 853 struct fs_type_compile {
 854         char **list;
 855         int *type;
 856         int  negate;
 857 } fs_type_compiled;
 858
 859 #define FS_TYPE_NORMAL  0
 860 #define FS_TYPE_OPT     1
 861 #define FS_TYPE_NEGOPT  2
 862
 863 static const char fs_type_syntax_error[] =
 864 "Either all or none of the filesystem types passed to -t must be prefixed\n"
 865    "with 'no' or '!'.";
 866
 867 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 868 {
 869         char    *cp, *list, *s;
 870         int     num = 2;
 871         int     negate, first_negate = 1;
 872
 873         if (fs_type) {
 874                 for (cp=fs_type; *cp; cp++) {
 875                         if (*cp == ',')
 876                                 num++;
 877                 }
 878         }
 879
 880         cmp->list = xzalloc(num * sizeof(char *));
 881         cmp->type = xzalloc(num * sizeof(int));
 882         cmp->negate = 0;
 883
 884         if (!fs_type)
 885                 return;
 886
 887         list = string_copy(fs_type);
 888         num = 0;
 889         s = strtok(list, ",");
 890         while(s) {
 891                 negate = 0;
 892                 if (strncmp(s, "no", 2) == 0) {
 893                         s += 2;
 894                         negate = 1;
 895                 } else if (*s == '!') {
 896                         s++;
 897                         negate = 1;
 898                 }
 899                 if (strcmp(s, "loop") == 0)
 900                         /* loop is really short-hand for opts=loop */
 901                         goto loop_special_case;
 902                 else if (strncmp(s, "opts=", 5) == 0) {
 903                         s += 5;
 904                 loop_special_case:
 905                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 906                 } else {
 907                         if (first_negate) {
 908                                 cmp->negate = negate;
 909                                 first_negate = 0;
 910                         }
 911                         if ((negate && !cmp->negate) ||
 912                             (!negate && cmp->negate)) {
 913                                 bb_error_msg_and_die("%s", fs_type_syntax_error);
 914                         }
 915                 }
 916                 cmp->list[num++] = string_copy(s);
 917                 s = strtok(NULL, ",");
 918         }
 919         free(list);
 920 }
 921
 922 /*
 923  * This function returns true if a particular option appears in a
 924  * comma-delimited options list
 925  */
 926 static int opt_in_list(char *opt, char *optlist)
 927 {
 928         char    *list, *s;
 929
 930         if (!optlist)
 931                 return 0;
 932         list = string_copy(optlist);
 933
 934         s = strtok(list, ",");
 935         while(s) {
 936                 if (strcmp(s, opt) == 0) {
 937                         free(list);
 938                         return 1;
 939                 }
 940                 s = strtok(NULL, ",");
 941         }
 942         free(list);
 943         return 0;
 944 }
 945
 946 /* See if the filesystem matches the criteria given by the -t option */
 947 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 948 {
 949         int n, ret = 0, checked_type = 0;
 950         char *cp;
 951
 952         if (cmp->list == 0 || cmp->list[0] == 0)
 953                 return 1;
 954
 955         for (n=0; (cp = cmp->list[n]); n++) {
 956                 switch (cmp->type[n]) {
 957                 case FS_TYPE_NORMAL:
 958                         checked_type++;
 959                         if (strcmp(cp, fs->type) == 0) {
 960                                 ret = 1;
 961                         }
 962                         break;
 963                 case FS_TYPE_NEGOPT:
 964                         if (opt_in_list(cp, fs->opts))
 965                                 return 0;
 966                         break;
 967                 case FS_TYPE_OPT:
 968                         if (!opt_in_list(cp, fs->opts))
 969                                 return 0;
 970                         break;
 971                 }
 972         }
 973         if (checked_type == 0)
 974                 return 1;
 975         return (cmp->negate ? !ret : ret);
 976 }
 977
 978 /* Check if we should ignore this filesystem. */
 979 static int ignore(struct fs_info *fs)
 980 {
 981         int wanted;
 982         char *s;
 983
 984         /*
 985          * If the pass number is 0, ignore it.
 986          */
 987         if (fs->passno == 0)
 988                 return 1;
 989
 990         interpret_type(fs);
 991
 992         /*
 993          * If a specific fstype is specified, and it doesn't match,
 994          * ignore it.
 995          */
 996         if (!fs_match(fs, &fs_type_compiled)) return 1;
 997
 998         /* Are we ignoring this type? */
 999         if (index_in_str_array(ignored_types, fs->type) >= 0)
1000                 return 1;
1001
1002         /* Do we really really want to check this fs? */
1003         wanted = index_in_str_array(really_wanted, fs->type) >= 0;
1004
1005         /* See if the <fsck.fs> program is available. */
1006         s = find_fsck(fs->type);
1007         if (s == NULL) {
1008                 if (wanted)
1009                         bb_error_msg("cannot check %s: fsck.%s not found",
1010                                 fs->device, fs->type);
1011                 return 1;
1012         }
1013         free(s);
1014
1015         /* We can and want to check this file system type. */
1016         return 0;
1017 }
1018
1019 /*
1020  * Returns TRUE if a partition on the same disk is already being
1021  * checked.
1022  */
1023 static int device_already_active(char *device)
1024 {
1025         struct fsck_instance *inst;
1026         char *base;
1027
1028         if (force_all_parallel)
1029                 return 0;
1030
1031 #ifdef BASE_MD
1032         /* Don't check a soft raid disk with any other disk */
1033         if (instance_list &&
1034             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
1035              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
1036                 return 1;
1037 #endif
1038
1039         base = base_device(device);
1040         /*
1041          * If we don't know the base device, assume that the device is
1042          * already active if there are any fsck instances running.
1043          */
1044         if (!base)
1045                 return (instance_list != 0);
1046         for (inst = instance_list; inst; inst = inst->next) {
1047                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
1048                         free(base);
1049                         return 1;
1050                 }
1051         }
1052         free(base);
1053         return 0;
1054 }
1055
1056 /* Check all file systems, using the /etc/fstab table. */
1057 static int check_all(void)
1058 {
1059         struct fs_info *fs = NULL;
1060         int status = EXIT_OK;
1061         int not_done_yet = 1;
1062         int passno = 1;
1063         int pass_done;
1064
1065         if (verbose)
1066                 fputs("Checking all file systems.\n", stdout);
1067
1068         /*
1069          * Do an initial scan over the filesystem; mark filesystems
1070          * which should be ignored as done, and resolve any "auto"
1071          * filesystem types (done as a side-effect of calling ignore()).
1072          */
1073         for (fs = filesys_info; fs; fs = fs->next) {
1074                 if (ignore(fs))
1075                         fs->flags |= FLAG_DONE;
1076         }
1077
1078         /*
1079          * Find and check the root filesystem.
1080          */
1081         if (!parallel_root) {
1082                 for (fs = filesys_info; fs; fs = fs->next) {
1083                         if (!strcmp(fs->mountpt, "/"))
1084                                 break;
1085                 }
1086                 if (fs) {
1087                         if (!skip_root && !ignore(fs)) {
1088                                 fsck_device(fs, 1);
1089                                 status |= wait_many(FLAG_WAIT_ALL);
1090                                 if (status > EXIT_NONDESTRUCT)
1091                                         return status;
1092                         }
1093                         fs->flags |= FLAG_DONE;
1094                 }
1095         }
1096         /*
1097          * This is for the bone-headed user who enters the root
1098          * filesystem twice.  Skip root will skep all root entries.
1099          */
1100         if (skip_root)
1101                 for (fs = filesys_info; fs; fs = fs->next)
1102                         if (!strcmp(fs->mountpt, "/"))
1103                                 fs->flags |= FLAG_DONE;
1104
1105         while (not_done_yet) {
1106                 not_done_yet = 0;
1107                 pass_done = 1;
1108
1109                 for (fs = filesys_info; fs; fs = fs->next) {
1110                         if (cancel_requested)
1111                                 break;
1112                         if (fs->flags & FLAG_DONE)
1113                                 continue;
1114                         /*
1115                          * If the filesystem's pass number is higher
1116                          * than the current pass number, then we don't
1117                          * do it yet.
1118                          */
1119                         if (fs->passno > passno) {
1120                                 not_done_yet++;
1121                                 continue;
1122                         }
1123                         /*
1124                          * If a filesystem on a particular device has
1125                          * already been spawned, then we need to defer
1126                          * this to another pass.
1127                          */
1128                         if (device_already_active(fs->device)) {
1129                                 pass_done = 0;
1130                                 continue;
1131                         }
1132                         /*
1133                          * Spawn off the fsck process
1134                          */
1135                         fsck_device(fs, serialize);
1136                         fs->flags |= FLAG_DONE;
1137
1138                         /*
1139                          * Only do one filesystem at a time, or if we
1140                          * have a limit on the number of fsck's extant
1141                          * at one time, apply that limit.
1142                          */
1143                         if (serialize ||
1144                             (max_running && (num_running >= max_running))) {
1145                                 pass_done = 0;
1146                                 break;
1147                         }
1148                 }
1149                 if (cancel_requested)
1150                         break;
1151                 if (verbose > 1)
1152                         printf("--waiting-- (pass %d)\n", passno);
1153                 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1154                                     FLAG_WAIT_ATLEAST_ONE);
1155                 if (pass_done) {
1156                         if (verbose > 1)
1157                                 printf("----------------------------------\n");
1158                         passno++;
1159                 } else
1160                         not_done_yet++;
1161         }
1162         if (cancel_requested && !kill_sent) {
1163                 kill_all(SIGTERM);
1164                 kill_sent++;
1165         }
1166         status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1167         return status;
1168 }
1169
1170 static void signal_cancel(int sig FSCK_ATTR((unused)))
1171 {
1172         cancel_requested++;
1173 }
1174
1175 static void PRS(int argc, char *argv[])
1176 {
1177         int     i, j;
1178         char    *arg, *dev, *tmp = 0;
1179         char    options[128];
1180         int     opt = 0;
1181         int     opts_for_fsck = 0;
1182         struct sigaction        sa;
1183
1184         /*
1185          * Set up signal action
1186          */
1187         memset(&sa, 0, sizeof(struct sigaction));
1188         sa.sa_handler = signal_cancel;
1189         sigaction(SIGINT, &sa, 0);
1190         sigaction(SIGTERM, &sa, 0);
1191
1192         num_devices = 0;
1193         num_args = 0;
1194         instance_list = 0;
1195
1196         for (i=1; i < argc; i++) {
1197                 arg = argv[i];
1198                 if (!arg)
1199                         continue;
1200                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1201                         if (num_devices >= MAX_DEVICES) {
1202                                 bb_error_msg_and_die("too many devices");
1203                         }
1204                         dev = blkid_get_devname(cache, arg, NULL);
1205                         if (!dev && strchr(arg, '=')) {
1206                                 /*
1207                                  * Check to see if we failed because
1208                                  * /proc/partitions isn't found.
1209                                  */
1210                                 if (access("/proc/partitions", R_OK) < 0) {
1211                                         bb_perror_msg_and_die("cannot open /proc/partitions "
1212                                                         "(is /proc mounted?)");
1213                                 }
1214                                 /*
1215                                  * Check to see if this is because
1216                                  * we're not running as root
1217                                  */
1218                                 if (geteuid())
1219                                         bb_error_msg_and_die(
1220                 "must be root to scan for matching filesystems: %s\n", arg);
1221                                 else
1222                                         bb_error_msg_and_die(
1223                 "cannot find matching filesystem: %s", arg);
1224                         }
1225                         devices[num_devices++] = dev ? dev : string_copy(arg);
1226                         continue;
1227                 }
1228                 if (arg[0] != '-' || opts_for_fsck) {
1229                         if (num_args >= MAX_ARGS) {
1230                                 bb_error_msg_and_die("too many arguments");
1231                         }
1232                         args[num_args++] = string_copy(arg);
1233                         continue;
1234                 }
1235                 for (j=1; arg[j]; j++) {
1236                         if (opts_for_fsck) {
1237                                 options[++opt] = arg[j];
1238                                 continue;
1239                         }
1240                         switch (arg[j]) {
1241                         case 'A':
1242                                 doall++;
1243                                 break;
1244                         case 'C':
1245                                 progress++;
1246                                 if (arg[j+1]) {
1247                                         progress_fd = string_to_int(arg+j+1);
1248                                         if (progress_fd < 0)
1249                                                 progress_fd = 0;
1250                                         else
1251                                                 goto next_arg;
1252                                 } else if ((i+1) < argc &&
1253                                            !strncmp(argv[i+1], "-", 1) == 0) {
1254                                         progress_fd = string_to_int(argv[i]);
1255                                         if (progress_fd < 0)
1256                                                 progress_fd = 0;
1257                                         else {
1258                                                 goto next_arg;
1259                                                 i++;
1260                                         }
1261                                 }
1262                                 break;
1263                         case 'V':
1264                                 verbose++;
1265                                 break;
1266                         case 'N':
1267                                 noexecute++;
1268                                 break;
1269                         case 'R':
1270                                 skip_root++;
1271                                 break;
1272                         case 'T':
1273                                 notitle++;
1274                                 break;
1275                         case 'M':
1276                                 like_mount++;
1277                                 break;
1278                         case 'P':
1279                                 parallel_root++;
1280                                 break;
1281                         case 's':
1282                                 serialize++;
1283                                 break;
1284                         case 't':
1285                                 tmp = 0;
1286                                 if (fstype)
1287                                         bb_show_usage();
1288                                 if (arg[j+1])
1289                                         tmp = arg+j+1;
1290                                 else if ((i+1) < argc)
1291                                         tmp = argv[++i];
1292                                 else
1293                                         bb_show_usage();
1294                                 fstype = string_copy(tmp);
1295                                 compile_fs_type(fstype, &fs_type_compiled);
1296                                 goto next_arg;
1297                         case '-':
1298                                 opts_for_fsck++;
1299                                 break;
1300                         case '?':
1301                                 bb_show_usage();
1302                                 break;
1303                         default:
1304                                 options[++opt] = arg[j];
1305                                 break;
1306                         }
1307                 }
1308         next_arg:
1309                 if (opt) {
1310                         options[0] = '-';
1311                         options[++opt] = '\0';
1312                         if (num_args >= MAX_ARGS) {
1313                                 bb_error_msg("too many arguments");
1314                         }
1315                         args[num_args++] = string_copy(options);
1316                         opt = 0;
1317                 }
1318         }
1319         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1320                 force_all_parallel++;
1321         if ((tmp = getenv("FSCK_MAX_INST")))
1322             max_running = atoi(tmp);
1323 }
1324
1325 int fsck_main(int argc, char *argv[])
1326 {
1327         int i, status = 0;
1328         int interactive = 0;
1329         const char *fstab;
1330         struct fs_info *fs;
1331
1332         setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1333         setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1334
1335         blkid_get_cache(&cache, NULL);
1336         PRS(argc, argv);
1337
1338         if (!notitle)
1339                 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1340
1341         fstab = getenv("FSTAB_FILE");
1342         if (!fstab)
1343                 fstab = _PATH_MNTTAB;
1344         load_fs_info(fstab);
1345
1346         fsck_path = e2fs_set_sbin_path();
1347
1348         if ((num_devices == 1) || (serialize))
1349                 interactive = 1;
1350
1351         /* If -A was specified ("check all"), do that! */
1352         if (doall)
1353                 return check_all();
1354
1355         if (num_devices == 0) {
1356                 serialize++;
1357                 interactive++;
1358                 return check_all();
1359         }
1360         for (i = 0 ; i < num_devices; i++) {
1361                 if (cancel_requested) {
1362                         if (!kill_sent) {
1363                                 kill_all(SIGTERM);
1364                                 kill_sent++;
1365                         }
1366                         break;
1367                 }
1368                 fs = lookup(devices[i]);
1369                 if (!fs) {
1370                         fs = create_fs_device(devices[i], 0, "auto",
1371                                               0, -1, -1);
1372                         if (!fs)
1373                                 continue;
1374                 }
1375                 fsck_device(fs, interactive);
1376                 if (serialize ||
1377                     (max_running && (num_running >= max_running))) {
1378                         struct fsck_instance *inst;
1379
1380                         inst = wait_one(0);
1381                         if (inst) {
1382                                 status |= inst->exit_status;
1383                                 free_instance(inst);
1384                         }
1385                         if (verbose > 1)
1386                                 printf("----------------------------------\n");
1387                 }
1388         }
1389         status |= wait_many(FLAG_WAIT_ALL);
1390         blkid_put_cache(cache);
1391         return status;
1392 }