e2fsprogs/old_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 "libbb.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 }
 376
 377 static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
 378                                         const char *type, const char *opts,
 379                                         int freq, int passno)
 380 {
 381         struct fs_info *fs;
 382
 383         if (!(fs = malloc(sizeof(struct fs_info))))
 384                 return NULL;
 385
 386         fs->device = string_copy(device);
 387         fs->mountpt = string_copy(mntpnt);
 388         fs->type = string_copy(type);
 389         fs->opts = string_copy(opts ? opts : "");
 390         fs->freq = freq;
 391         fs->passno = passno;
 392         fs->flags = 0;
 393         fs->next = NULL;
 394
 395         if (!filesys_info)
 396                 filesys_info = fs;
 397         else
 398                 filesys_last->next = fs;
 399         filesys_last = fs;
 400
 401         return fs;
 402 }
 403
 404
 405
 406 static int parse_fstab_line(char *line, struct fs_info **ret_fs)
 407 {
 408         char    *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
 409         struct fs_info *fs;
 410
 411         *ret_fs = 0;
 412         strip_line(line);
 413         if ((cp = strchr(line, '#')))
 414                 *cp = 0;        /* Ignore everything after the comment char */
 415         cp = line;
 416
 417         device = parse_word(&cp);
 418         mntpnt = parse_word(&cp);
 419         type = parse_word(&cp);
 420         opts = parse_word(&cp);
 421         freq = parse_word(&cp);
 422         passno = parse_word(&cp);
 423
 424         if (!device)
 425                 return 0;       /* Allow blank lines */
 426
 427         if (!mntpnt || !type)
 428                 return -1;
 429
 430         parse_escape(device);
 431         parse_escape(mntpnt);
 432         parse_escape(type);
 433         parse_escape(opts);
 434         parse_escape(freq);
 435         parse_escape(passno);
 436
 437         dev = blkid_get_devname(cache, device, NULL);
 438         if (dev)
 439                 device = dev;
 440
 441         if (strchr(type, ','))
 442                 type = 0;
 443
 444         fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
 445                               freq ? atoi(freq) : -1,
 446                               passno ? atoi(passno) : -1);
 447         if (dev)
 448                 free(dev);
 449
 450         if (!fs)
 451                 return -1;
 452         *ret_fs = fs;
 453         return 0;
 454 }
 455
 456 static void interpret_type(struct fs_info *fs)
 457 {
 458         char    *t;
 459
 460         if (strcmp(fs->type, "auto") != 0)
 461                 return;
 462         t = blkid_get_tag_value(cache, "TYPE", fs->device);
 463         if (t) {
 464                 free(fs->type);
 465                 fs->type = t;
 466         }
 467 }
 468
 469 /*
 470  * Load the filesystem database from /etc/fstab
 471  */
 472 static void load_fs_info(const char *filename)
 473 {
 474         FILE    *f;
 475         char    buf[1024];
 476         int     lineno = 0;
 477         int     old_fstab = 1;
 478         struct fs_info *fs;
 479
 480         if ((f = fopen(filename, "r")) == NULL) {
 481                 bb_perror_msg("WARNING: cannot open %s", filename);
 482                 return;
 483         }
 484         while (!feof(f)) {
 485                 lineno++;
 486                 if (!fgets(buf, sizeof(buf), f))
 487                         break;
 488                 buf[sizeof(buf)-1] = 0;
 489                 if (parse_fstab_line(buf, &fs) < 0) {
 490                         bb_error_msg("WARNING: bad format "
 491                                 "on line %d of %s\n", lineno, filename);
 492                         continue;
 493                 }
 494                 if (!fs)
 495                         continue;
 496                 if (fs->passno < 0)
 497                         fs->passno = 0;
 498                 else
 499                         old_fstab = 0;
 500         }
 501
 502         fclose(f);
 503
 504         if (old_fstab) {
 505                 fputs("\007\007\007"
 506                 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
 507                 "       field.  I will kludge around things for you, but you\n"
 508                 "       should fix your /etc/fstab file as soon as you can.\n\n", stderr);
 509
 510                 for (fs = filesys_info; fs; fs = fs->next) {
 511                         fs->passno = 1;
 512                 }
 513         }
 514 }
 515
 516 /* Lookup filesys in /etc/fstab and return the corresponding entry. */
 517 static struct fs_info *lookup(char *filesys)
 518 {
 519         struct fs_info *fs;
 520
 521         /* No filesys name given. */
 522         if (filesys == NULL)
 523                 return NULL;
 524
 525         for (fs = filesys_info; fs; fs = fs->next) {
 526                 if (!strcmp(filesys, fs->device) ||
 527                     (fs->mountpt && !strcmp(filesys, fs->mountpt)))
 528                         break;
 529         }
 530
 531         return fs;
 532 }
 533
 534 /* Find fsck program for a given fs type. */
 535 static char *find_fsck(char *type)
 536 {
 537   char *s;
 538   const char *tpl;
 539   char *p = string_copy(fsck_path);
 540   struct stat st;
 541
 542   /* Are we looking for a program or just a type? */
 543   tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
 544
 545   for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
 546         s = xasprintf(tpl, s, type);
 547         if (stat(s, &st) == 0) break;
 548         free(s);
 549   }
 550   free(p);
 551   return s;
 552 }
 553
 554 static int progress_active(void)
 555 {
 556         struct fsck_instance *inst;
 557
 558         for (inst = instance_list; inst; inst = inst->next) {
 559                 if (inst->flags & FLAG_DONE)
 560                         continue;
 561                 if (inst->flags & FLAG_PROGRESS)
 562                         return 1;
 563         }
 564         return 0;
 565 }
 566
 567 /*
 568  * Execute a particular fsck program, and link it into the list of
 569  * child processes we are waiting for.
 570  */
 571 static int execute(const char *type, const char *device, const char *mntpt,
 572                    int interactive)
 573 {
 574         char *s, *argv[80];
 575         char *prog;
 576         int  argc, i;
 577         struct fsck_instance *inst, *p;
 578         pid_t   pid;
 579
 580         inst = malloc(sizeof(struct fsck_instance));
 581         if (!inst)
 582                 return ENOMEM;
 583         memset(inst, 0, sizeof(struct fsck_instance));
 584
 585         prog = xasprintf("fsck.%s", type);
 586         argv[0] = prog;
 587         argc = 1;
 588
 589         for (i=0; i <num_args; i++)
 590                 argv[argc++] = string_copy(args[i]);
 591
 592         if (progress && !progress_active()) {
 593                 if ((strcmp(type, "ext2") == 0) ||
 594                     (strcmp(type, "ext3") == 0)) {
 595                         char tmp[80];
 596                         snprintf(tmp, 80, "-C%d", progress_fd);
 597                         argv[argc++] = string_copy(tmp);
 598                         inst->flags |= FLAG_PROGRESS;
 599                 }
 600         }
 601
 602         argv[argc++] = string_copy(device);
 603         argv[argc] = 0;
 604
 605         s = find_fsck(prog);
 606         if (s == NULL) {
 607                 bb_error_msg("%s: not found", prog);
 608                 return ENOENT;
 609         }
 610
 611         if (verbose || noexecute) {
 612                 printf("[%s (%d) -- %s] ", s, num_running,
 613                        mntpt ? mntpt : device);
 614                 for (i=0; i < argc; i++)
 615                         printf("%s ", argv[i]);
 616                 bb_putchar('\n');
 617         }
 618
 619         /* Fork and execute the correct program. */
 620         if (noexecute)
 621                 pid = -1;
 622         else if ((pid = fork()) < 0) {
 623                 perror("fork");
 624                 return errno;
 625         } else if (pid == 0) {
 626                 if (!interactive)
 627                         close(0);
 628                 (void) execv(s, argv);
 629                 bb_simple_perror_msg_and_die(argv[0]);
 630         }
 631
 632         for (i = 1; i < argc; i++)
 633                 free(argv[i]);
 634
 635         free(s);
 636         inst->pid = pid;
 637         inst->prog = prog;
 638         inst->type = string_copy(type);
 639         inst->device = string_copy(device);
 640         inst->base_device = base_device(device);
 641         inst->start_time = time(0);
 642         inst->next = NULL;
 643
 644         /*
 645          * Find the end of the list, so we add the instance on at the end.
 646          */
 647         for (p = instance_list; p && p->next; p = p->next);
 648
 649         if (p)
 650                 p->next = inst;
 651         else
 652                 instance_list = inst;
 653
 654         return 0;
 655 }
 656
 657 /*
 658  * Send a signal to all outstanding fsck child processes
 659  */
 660 static int kill_all(int signum)
 661 {
 662         struct fsck_instance *inst;
 663         int     n = 0;
 664
 665         for (inst = instance_list; inst; inst = inst->next) {
 666                 if (inst->flags & FLAG_DONE)
 667                         continue;
 668                 kill(inst->pid, signum);
 669                 n++;
 670         }
 671         return n;
 672 }
 673
 674 /*
 675  * Wait for one child process to exit; when it does, unlink it from
 676  * the list of executing child processes, and return it.
 677  */
 678 static struct fsck_instance *wait_one(int flags)
 679 {
 680         int     status;
 681         int     sig;
 682         struct fsck_instance *inst, *inst2, *prev;
 683         pid_t   pid;
 684
 685         if (!instance_list)
 686                 return NULL;
 687
 688         if (noexecute) {
 689                 inst = instance_list;
 690                 prev = 0;
 691 #ifdef RANDOM_DEBUG
 692                 while (inst->next && (random() & 1)) {
 693                         prev = inst;
 694                         inst = inst->next;
 695                 }
 696 #endif
 697                 inst->exit_status = 0;
 698                 goto ret_inst;
 699         }
 700
 701         /*
 702          * gcc -Wall fails saving throw against stupidity
 703          * (inst and prev are thought to be uninitialized variables)
 704          */
 705         inst = prev = NULL;
 706
 707         do {
 708                 pid = waitpid(-1, &status, flags);
 709                 if (cancel_requested && !kill_sent) {
 710                         kill_all(SIGTERM);
 711                         kill_sent++;
 712                 }
 713                 if ((pid == 0) && (flags & WNOHANG))
 714                         return NULL;
 715                 if (pid < 0) {
 716                         if ((errno == EINTR) || (errno == EAGAIN))
 717                                 continue;
 718                         if (errno == ECHILD) {
 719                                 bb_error_msg("wait: no more child process?!?");
 720                                 return NULL;
 721                         }
 722                         perror("wait");
 723                         continue;
 724                 }
 725                 for (prev = 0, inst = instance_list;
 726                      inst;
 727                      prev = inst, inst = inst->next) {
 728                         if (inst->pid == pid)
 729                                 break;
 730                 }
 731         } while (!inst);
 732
 733         if (WIFEXITED(status))
 734                 status = WEXITSTATUS(status);
 735         else if (WIFSIGNALED(status)) {
 736                 sig = WTERMSIG(status);
 737                 if (sig == SIGINT) {
 738                         status = EXIT_UNCORRECTED;
 739                 } else {
 740                         printf("Warning... %s for device %s exited "
 741                                "with signal %d.\n",
 742                                inst->prog, inst->device, sig);
 743                         status = EXIT_ERROR;
 744                 }
 745         } else {
 746                 printf("%s %s: status is %x, should never happen.\n",
 747                        inst->prog, inst->device, status);
 748                 status = EXIT_ERROR;
 749         }
 750         inst->exit_status = status;
 751         if (progress && (inst->flags & FLAG_PROGRESS) &&
 752             !progress_active()) {
 753                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 754                         if (inst2->flags & FLAG_DONE)
 755                                 continue;
 756                         if (strcmp(inst2->type, "ext2") &&
 757                             strcmp(inst2->type, "ext3"))
 758                                 continue;
 759                         /*
 760                          * If we've just started the fsck, wait a tiny
 761                          * bit before sending the kill, to give it
 762                          * time to set up the signal handler
 763                          */
 764                         if (inst2->start_time < time(0)+2) {
 765                                 if (fork() == 0) {
 766                                         sleep(1);
 767                                         kill(inst2->pid, SIGUSR1);
 768                                         exit(0);
 769                                 }
 770                         } else
 771                                 kill(inst2->pid, SIGUSR1);
 772                         inst2->flags |= FLAG_PROGRESS;
 773                         break;
 774                 }
 775         }
 776 ret_inst:
 777         if (prev)
 778                 prev->next = inst->next;
 779         else
 780                 instance_list = inst->next;
 781         if (verbose > 1)
 782                 printf("Finished with %s (exit status %d)\n",
 783                        inst->device, inst->exit_status);
 784         num_running--;
 785         return inst;
 786 }
 787
 788 #define FLAG_WAIT_ALL           0
 789 #define FLAG_WAIT_ATLEAST_ONE   1
 790 /*
 791  * Wait until all executing child processes have exited; return the
 792  * logical OR of all of their exit code values.
 793  */
 794 static int wait_many(int flags)
 795 {
 796         struct fsck_instance *inst;
 797         int     global_status = 0;
 798         int     wait_flags = 0;
 799
 800         while ((inst = wait_one(wait_flags))) {
 801                 global_status |= inst->exit_status;
 802                 free_instance(inst);
 803 #ifdef RANDOM_DEBUG
 804                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 805                         break;
 806 #endif
 807                 if (flags & FLAG_WAIT_ATLEAST_ONE)
 808                         wait_flags = WNOHANG;
 809         }
 810         return global_status;
 811 }
 812
 813 /*
 814  * Run the fsck program on a particular device
 815  *
 816  * If the type is specified using -t, and it isn't prefixed with "no"
 817  * (as in "noext2") and only one filesystem type is specified, then
 818  * use that type regardless of what is specified in /etc/fstab.
 819  *
 820  * If the type isn't specified by the user, then use either the type
 821  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 822  */
 823 static void fsck_device(struct fs_info *fs, int interactive)
 824 {
 825         const char *type;
 826         int retval;
 827
 828         interpret_type(fs);
 829
 830         if (strcmp(fs->type, "auto") != 0)
 831                 type = fs->type;
 832         else if (fstype && strncmp(fstype, "no", 2) &&
 833             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 834             !strchr(fstype, ','))
 835                 type = fstype;
 836         else
 837                 type = DEFAULT_FSTYPE;
 838
 839         num_running++;
 840         retval = execute(type, fs->device, fs->mountpt, interactive);
 841         if (retval) {
 842                 bb_error_msg("error %d while executing fsck.%s for %s",
 843                                                 retval, type, fs->device);
 844                 num_running--;
 845         }
 846 }
 847
 848
 849 /*
 850  * Deal with the fsck -t argument.
 851  */
 852 struct fs_type_compile {
 853         char **list;
 854         int *type;
 855         int  negate;
 856 } fs_type_compiled;
 857
 858 #define FS_TYPE_NORMAL  0
 859 #define FS_TYPE_OPT     1
 860 #define FS_TYPE_NEGOPT  2
 861
 862 static const char fs_type_syntax_error[] =
 863 "Either all or none of the filesystem types passed to -t must be prefixed\n"
 864    "with 'no' or '!'.";
 865
 866 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 867 {
 868         char    *cp, *list, *s;
 869         int     num = 2;
 870         int     negate, first_negate = 1;
 871
 872         if (fs_type) {
 873                 for (cp=fs_type; *cp; cp++) {
 874                         if (*cp == ',')
 875                                 num++;
 876                 }
 877         }
 878
 879         cmp->list = xzalloc(num * sizeof(char *));
 880         cmp->type = xzalloc(num * sizeof(int));
 881         cmp->negate = 0;
 882
 883         if (!fs_type)
 884                 return;
 885
 886         list = string_copy(fs_type);
 887         num = 0;
 888         s = strtok(list, ",");
 889         while(s) {
 890                 negate = 0;
 891                 if (strncmp(s, "no", 2) == 0) {
 892                         s += 2;
 893                         negate = 1;
 894                 } else if (*s == '!') {
 895                         s++;
 896                         negate = 1;
 897                 }
 898                 if (strcmp(s, "loop") == 0)
 899                         /* loop is really short-hand for opts=loop */
 900                         goto loop_special_case;
 901                 else if (strncmp(s, "opts=", 5) == 0) {
 902                         s += 5;
 903                 loop_special_case:
 904                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 905                 } else {
 906                         if (first_negate) {
 907                                 cmp->negate = negate;
 908                                 first_negate = 0;
 909                         }
 910                         if ((negate && !cmp->negate) ||
 911                             (!negate && cmp->negate)) {
 912                                 bb_error_msg_and_die("%s", fs_type_syntax_error);
 913                         }
 914                 }
 915                 cmp->list[num++] = string_copy(s);
 916                 s = strtok(NULL, ",");
 917         }
 918         free(list);
 919 }
 920
 921 /*
 922  * This function returns true if a particular option appears in a
 923  * comma-delimited options list
 924  */
 925 static int opt_in_list(char *opt, char *optlist)
 926 {
 927         char    *list, *s;
 928
 929         if (!optlist)
 930                 return 0;
 931         list = string_copy(optlist);
 932
 933         s = strtok(list, ",");
 934         while(s) {
 935                 if (strcmp(s, opt) == 0) {
 936                         free(list);
 937                         return 1;
 938                 }
 939                 s = strtok(NULL, ",");
 940         }
 941         free(list);
 942         return 0;
 943 }
 944
 945 /* See if the filesystem matches the criteria given by the -t option */
 946 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 947 {
 948         int n, ret = 0, checked_type = 0;
 949         char *cp;
 950
 951         if (cmp->list == 0 || cmp->list[0] == 0)
 952                 return 1;
 953
 954         for (n=0; (cp = cmp->list[n]); n++) {
 955                 switch (cmp->type[n]) {
 956                 case FS_TYPE_NORMAL:
 957                         checked_type++;
 958                         if (strcmp(cp, fs->type) == 0) {
 959                                 ret = 1;
 960                         }
 961                         break;
 962                 case FS_TYPE_NEGOPT:
 963                         if (opt_in_list(cp, fs->opts))
 964                                 return 0;
 965                         break;
 966                 case FS_TYPE_OPT:
 967                         if (!opt_in_list(cp, fs->opts))
 968                                 return 0;
 969                         break;
 970                 }
 971         }
 972         if (checked_type == 0)
 973                 return 1;
 974         return (cmp->negate ? !ret : ret);
 975 }
 976
 977 /* Check if we should ignore this filesystem. */
 978 static int ignore(struct fs_info *fs)
 979 {
 980         int wanted;
 981         char *s;
 982
 983         /*
 984          * If the pass number is 0, ignore it.
 985          */
 986         if (fs->passno == 0)
 987                 return 1;
 988
 989         interpret_type(fs);
 990
 991         /*
 992          * If a specific fstype is specified, and it doesn't match,
 993          * ignore it.
 994          */
 995         if (!fs_match(fs, &fs_type_compiled)) return 1;
 996
 997         /* Are we ignoring this type? */
 998         if (index_in_str_array(ignored_types, fs->type) >= 0)
 999                 return 1;
1000
1001         /* Do we really really want to check this fs? */
1002         wanted = index_in_str_array(really_wanted, fs->type) >= 0;
1003
1004         /* See if the <fsck.fs> program is available. */
1005         s = find_fsck(fs->type);
1006         if (s == NULL) {
1007                 if (wanted)
1008                         bb_error_msg("cannot check %s: fsck.%s not found",
1009                                 fs->device, fs->type);
1010                 return 1;
1011         }
1012         free(s);
1013
1014         /* We can and want to check this file system type. */
1015         return 0;
1016 }
1017
1018 /*
1019  * Returns TRUE if a partition on the same disk is already being
1020  * checked.
1021  */
1022 static int device_already_active(char *device)
1023 {
1024         struct fsck_instance *inst;
1025         char *base;
1026
1027         if (force_all_parallel)
1028                 return 0;
1029
1030 #ifdef BASE_MD
1031         /* Don't check a soft raid disk with any other disk */
1032         if (instance_list &&
1033             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
1034              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
1035                 return 1;
1036 #endif
1037
1038         base = base_device(device);
1039         /*
1040          * If we don't know the base device, assume that the device is
1041          * already active if there are any fsck instances running.
1042          */
1043         if (!base)
1044                 return (instance_list != 0);
1045         for (inst = instance_list; inst; inst = inst->next) {
1046                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
1047                         free(base);
1048                         return 1;
1049                 }
1050         }
1051         free(base);
1052         return 0;
1053 }
1054
1055 /* Check all file systems, using the /etc/fstab table. */
1056 static int check_all(void)
1057 {
1058         struct fs_info *fs = NULL;
1059         int status = EXIT_OK;
1060         int not_done_yet = 1;
1061         int passno = 1;
1062         int pass_done;
1063
1064         if (verbose)
1065                 fputs("Checking all file systems.\n", stdout);
1066
1067         /*
1068          * Do an initial scan over the filesystem; mark filesystems
1069          * which should be ignored as done, and resolve any "auto"
1070          * filesystem types (done as a side-effect of calling ignore()).
1071          */
1072         for (fs = filesys_info; fs; fs = fs->next) {
1073                 if (ignore(fs))
1074                         fs->flags |= FLAG_DONE;
1075         }
1076
1077         /*
1078          * Find and check the root filesystem.
1079          */
1080         if (!parallel_root) {
1081                 for (fs = filesys_info; fs; fs = fs->next) {
1082                         if (LONE_CHAR(fs->mountpt, '/'))
1083                                 break;
1084                 }
1085                 if (fs) {
1086                         if (!skip_root && !ignore(fs)) {
1087                                 fsck_device(fs, 1);
1088                                 status |= wait_many(FLAG_WAIT_ALL);
1089                                 if (status > EXIT_NONDESTRUCT)
1090                                         return status;
1091                         }
1092                         fs->flags |= FLAG_DONE;
1093                 }
1094         }
1095         /*
1096          * This is for the bone-headed user who enters the root
1097          * filesystem twice.  Skip root will skep all root entries.
1098          */
1099         if (skip_root)
1100                 for (fs = filesys_info; fs; fs = fs->next)
1101                         if (LONE_CHAR(fs->mountpt, '/'))
1102                                 fs->flags |= FLAG_DONE;
1103
1104         while (not_done_yet) {
1105                 not_done_yet = 0;
1106                 pass_done = 1;
1107
1108                 for (fs = filesys_info; fs; fs = fs->next) {
1109                         if (cancel_requested)
1110                                 break;
1111                         if (fs->flags & FLAG_DONE)
1112                                 continue;
1113                         /*
1114                          * If the filesystem's pass number is higher
1115                          * than the current pass number, then we don't
1116                          * do it yet.
1117                          */
1118                         if (fs->passno > passno) {
1119                                 not_done_yet++;
1120                                 continue;
1121                         }
1122                         /*
1123                          * If a filesystem on a particular device has
1124                          * already been spawned, then we need to defer
1125                          * this to another pass.
1126                          */
1127                         if (device_already_active(fs->device)) {
1128                                 pass_done = 0;
1129                                 continue;
1130                         }
1131                         /*
1132                          * Spawn off the fsck process
1133                          */
1134                         fsck_device(fs, serialize);
1135                         fs->flags |= FLAG_DONE;
1136
1137                         /*
1138                          * Only do one filesystem at a time, or if we
1139                          * have a limit on the number of fsck's extant
1140                          * at one time, apply that limit.
1141                          */
1142                         if (serialize ||
1143                             (max_running && (num_running >= max_running))) {
1144                                 pass_done = 0;
1145                                 break;
1146                         }
1147                 }
1148                 if (cancel_requested)
1149                         break;
1150                 if (verbose > 1)
1151                         printf("--waiting-- (pass %d)\n", passno);
1152                 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1153                                     FLAG_WAIT_ATLEAST_ONE);
1154                 if (pass_done) {
1155                         if (verbose > 1)
1156                                 printf("----------------------------------\n");
1157                         passno++;
1158                 } else
1159                         not_done_yet++;
1160         }
1161         if (cancel_requested && !kill_sent) {
1162                 kill_all(SIGTERM);
1163                 kill_sent++;
1164         }
1165         status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1166         return status;
1167 }
1168
1169 static void signal_cancel(int sig FSCK_ATTR((unused)))
1170 {
1171         cancel_requested++;
1172 }
1173
1174 static void PRS(int argc, char **argv)
1175 {
1176         int     i, j;
1177         char    *arg, *dev, *tmp = 0;
1178         char    options[128];
1179         int     opt = 0;
1180         int     opts_for_fsck = 0;
1181         struct sigaction        sa;
1182
1183         /*
1184          * Set up signal action
1185          */
1186         memset(&sa, 0, sizeof(struct sigaction));
1187         sa.sa_handler = signal_cancel;
1188         sigaction(SIGINT, &sa, 0);
1189         sigaction(SIGTERM, &sa, 0);
1190
1191         num_devices = 0;
1192         num_args = 0;
1193         instance_list = 0;
1194
1195         for (i=1; i < argc; i++) {
1196                 arg = argv[i];
1197                 if (!arg)
1198                         continue;
1199                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1200                         if (num_devices >= MAX_DEVICES) {
1201                                 bb_error_msg_and_die("too many devices");
1202                         }
1203                         dev = blkid_get_devname(cache, arg, NULL);
1204                         if (!dev && strchr(arg, '=')) {
1205                                 /*
1206                                  * Check to see if we failed because
1207                                  * /proc/partitions isn't found.
1208                                  */
1209                                 if (access("/proc/partitions", R_OK) < 0) {
1210                                         bb_perror_msg_and_die("cannot open /proc/partitions "
1211                                                         "(is /proc mounted?)");
1212                                 }
1213                                 /*
1214                                  * Check to see if this is because
1215                                  * we're not running as root
1216                                  */
1217                                 if (geteuid())
1218                                         bb_error_msg_and_die(
1219                 "must be root to scan for matching filesystems: %s\n", arg);
1220                                 else
1221                                         bb_error_msg_and_die(
1222                 "cannot find matching filesystem: %s", arg);
1223                         }
1224                         devices[num_devices++] = dev ? dev : string_copy(arg);
1225                         continue;
1226                 }
1227                 if (arg[0] != '-' || opts_for_fsck) {
1228                         if (num_args >= MAX_ARGS) {
1229                                 bb_error_msg_and_die("too many arguments");
1230                         }
1231                         args[num_args++] = string_copy(arg);
1232                         continue;
1233                 }
1234                 for (j=1; arg[j]; j++) {
1235                         if (opts_for_fsck) {
1236                                 options[++opt] = arg[j];
1237                                 continue;
1238                         }
1239                         switch (arg[j]) {
1240                         case 'A':
1241                                 doall++;
1242                                 break;
1243                         case 'C':
1244                                 progress++;
1245                                 if (arg[j+1]) {
1246                                         progress_fd = string_to_int(arg+j+1);
1247                                         if (progress_fd < 0)
1248                                                 progress_fd = 0;
1249                                         else
1250                                                 goto next_arg;
1251                                 } else if ((i+1) < argc
1252                                  && argv[i+1][0] != '-') {
1253                                         progress_fd = string_to_int(argv[i]);
1254                                         if (progress_fd < 0)
1255                                                 progress_fd = 0;
1256                                         else {
1257                                                 goto next_arg;
1258                                                 i++;
1259                                         }
1260                                 }
1261                                 break;
1262                         case 'V':
1263                                 verbose++;
1264                                 break;
1265                         case 'N':
1266                                 noexecute++;
1267                                 break;
1268                         case 'R':
1269                                 skip_root++;
1270                                 break;
1271                         case 'T':
1272                                 notitle++;
1273                                 break;
1274                         case 'M':
1275                                 like_mount++;
1276                                 break;
1277                         case 'P':
1278                                 parallel_root++;
1279                                 break;
1280                         case 's':
1281                                 serialize++;
1282                                 break;
1283                         case 't':
1284                                 tmp = 0;
1285                                 if (fstype)
1286                                         bb_show_usage();
1287                                 if (arg[j+1])
1288                                         tmp = arg+j+1;
1289                                 else if ((i+1) < argc)
1290                                         tmp = argv[++i];
1291                                 else
1292                                         bb_show_usage();
1293                                 fstype = string_copy(tmp);
1294                                 compile_fs_type(fstype, &fs_type_compiled);
1295                                 goto next_arg;
1296                         case '-':
1297                                 opts_for_fsck++;
1298                                 break;
1299                         case '?':
1300                                 bb_show_usage();
1301                                 break;
1302                         default:
1303                                 options[++opt] = arg[j];
1304                                 break;
1305                         }
1306                 }
1307         next_arg:
1308                 if (opt) {
1309                         options[0] = '-';
1310                         options[++opt] = '\0';
1311                         if (num_args >= MAX_ARGS) {
1312                                 bb_error_msg("too many arguments");
1313                         }
1314                         args[num_args++] = string_copy(options);
1315                         opt = 0;
1316                 }
1317         }
1318         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1319                 force_all_parallel++;
1320         if ((tmp = getenv("FSCK_MAX_INST")))
1321             max_running = atoi(tmp);
1322 }
1323
1324 int fsck_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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 }