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  * Licensed under GPLv2, see file LICENSE in this source tree.
  24  */
  25
  26 #include <sys/types.h>
  27 #include <sys/wait.h>
  28 #include <sys/stat.h>
  29 #include <limits.h>
  30 #include <stdio.h>
  31 #include <ctype.h>
  32 #include <string.h>
  33 #include <time.h>
  34 #include <stdlib.h>
  35 #include <errno.h>
  36 #include <paths.h>
  37 #include <unistd.h>
  38 #include <errno.h>
  39 #include <signal.h>
  40
  41 #include "fsck.h"
  42 #include "blkid/blkid.h"
  43
  44 #include "e2fsbb.h"
  45
  46 #include "libbb.h"
  47
  48 #ifndef _PATH_MNTTAB
  49 #define _PATH_MNTTAB    "/etc/fstab"
  50 #endif
  51
  52 /*
  53  * fsck.h
  54  */
  55
  56 #ifndef DEFAULT_FSTYPE
  57 #define DEFAULT_FSTYPE  "ext2"
  58 #endif
  59
  60 #define MAX_DEVICES 32
  61 #define MAX_ARGS 32
  62
  63 /*
  64  * Internal structure for mount tabel entries.
  65  */
  66
  67 struct fs_info {
  68         char  *device;
  69         char  *mountpt;
  70         char  *type;
  71         char  *opts;
  72         int   freq;
  73         int   passno;
  74         int   flags;
  75         struct fs_info *next;
  76 };
  77
  78 #define FLAG_DONE 1
  79 #define FLAG_PROGRESS 2
  80
  81 /*
  82  * Structure to allow exit codes to be stored
  83  */
  84 struct fsck_instance {
  85         int     pid;
  86         int     flags;
  87         int     exit_status;
  88         time_t  start_time;
  89         char *  prog;
  90         char *  type;
  91         char *  device;
  92         char *  base_device;
  93         struct fsck_instance *next;
  94 };
  95
  96 /*
  97  * base_device.c
  98  *
  99  * Return the "base device" given a particular device; this is used to
 100  * assure that we only fsck one partition on a particular drive at any
 101  * one time.  Otherwise, the disk heads will be seeking all over the
 102  * place.  If the base device cannot be determined, return NULL.
 103  *
 104  * The base_device() function returns an allocated string which must
 105  * be freed.
 106  *
 107  */
 108
 109
 110 #ifdef CONFIG_FEATURE_DEVFS
 111 /*
 112  * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
 113  * pathames.
 114  */
 115 static const char *const devfs_hier[] = {
 116         "host", "bus", "target", "lun", 0
 117 };
 118 #endif
 119
 120 static char *base_device(const char *device)
 121 {
 122         char *str, *cp;
 123 #ifdef CONFIG_FEATURE_DEVFS
 124         const char *const *hier;
 125         const char *disk;
 126         int len;
 127 #endif
 128
 129         cp = str = xstrdup(device);
 130
 131         /* Skip over /dev/; if it's not present, give up. */
 132         if (strncmp(cp, "/dev/", 5) != 0)
 133                 goto errout;
 134         cp += 5;
 135
 136         /*
 137          * For md devices, we treat them all as if they were all
 138          * on one disk, since we don't know how to parallelize them.
 139          */
 140         if (cp[0] == 'm' && cp[1] == 'd') {
 141                 *(cp+2) = 0;
 142                 return str;
 143         }
 144
 145         /* Handle DAC 960 devices */
 146         if (strncmp(cp, "rd/", 3) == 0) {
 147                 cp += 3;
 148                 if (cp[0] != 'c' || cp[2] != 'd' ||
 149                     !isdigit(cp[1]) || !isdigit(cp[3]))
 150                         goto errout;
 151                 *(cp+4) = 0;
 152                 return str;
 153         }
 154
 155         /* Now let's handle /dev/hd* and /dev/sd* devices.... */
 156         if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) {
 157                 cp += 2;
 158                 /* If there's a single number after /dev/hd, skip it */
 159                 if (isdigit(*cp))
 160                         cp++;
 161                 /* What follows must be an alpha char, or give up */
 162                 if (!isalpha(*cp))
 163                         goto errout;
 164                 *(cp + 1) = 0;
 165                 return str;
 166         }
 167
 168 #ifdef CONFIG_FEATURE_DEVFS
 169         /* Now let's handle devfs (ugh) names */
 170         len = 0;
 171         if (strncmp(cp, "ide/", 4) == 0)
 172                 len = 4;
 173         if (strncmp(cp, "scsi/", 5) == 0)
 174                 len = 5;
 175         if (len) {
 176                 cp += len;
 177                 /*
 178                  * Now we proceed down the expected devfs hierarchy.
 179                  * i.e., .../host1/bus2/target3/lun4/...
 180                  * If we don't find the expected token, followed by
 181                  * some number of digits at each level, abort.
 182                  */
 183                 for (hier = devfs_hier; *hier; hier++) {
 184                         len = strlen(*hier);
 185                         if (strncmp(cp, *hier, len) != 0)
 186                                 goto errout;
 187                         cp += len;
 188                         while (*cp != '/' && *cp != 0) {
 189                                 if (!isdigit(*cp))
 190                                         goto errout;
 191                                 cp++;
 192                         }
 193                         cp++;
 194                 }
 195                 *(cp - 1) = 0;
 196                 return str;
 197         }
 198
 199         /* Now handle devfs /dev/disc or /dev/disk names */
 200         disk = 0;
 201         if (strncmp(cp, "discs/", 6) == 0)
 202                 disk = "disc";
 203         else if (strncmp(cp, "disks/", 6) == 0)
 204                 disk = "disk";
 205         if (disk) {
 206                 cp += 6;
 207                 if (strncmp(cp, disk, 4) != 0)
 208                         goto errout;
 209                 cp += 4;
 210                 while (*cp != '/' && *cp != 0) {
 211                         if (!isdigit(*cp))
 212                                 goto errout;
 213                         cp++;
 214                 }
 215                 *cp = 0;
 216                 return str;
 217         }
 218 #endif
 219
 220 errout:
 221         free(str);
 222         return NULL;
 223 }
 224
 225
 226 static const char *const ignored_types[] = {
 227         "ignore",
 228         "iso9660",
 229         "nfs",
 230         "proc",
 231         "sw",
 232         "swap",
 233         "tmpfs",
 234         "devpts",
 235         NULL
 236 };
 237
 238 static const char *const really_wanted[] = {
 239         "minix",
 240         "ext2",
 241         "ext3",
 242         "jfs",
 243         "reiserfs",
 244         "xiafs",
 245         "xfs",
 246         NULL
 247 };
 248
 249 #define BASE_MD "/dev/md"
 250
 251 /*
 252  * Global variables for options
 253  */
 254 static char *devices[MAX_DEVICES];
 255 static char *args[MAX_ARGS];
 256 static int num_devices, num_args;
 257
 258 static int verbose;
 259 static int doall;
 260 static int noexecute;
 261 static int serialize;
 262 static int skip_root;
 263 static int like_mount;
 264 static int notitle;
 265 static int parallel_root;
 266 static int progress;
 267 static int progress_fd;
 268 static int force_all_parallel;
 269 static int num_running;
 270 static int max_running;
 271 static volatile int cancel_requested;
 272 static int kill_sent;
 273 static char *fstype;
 274 static struct fs_info *filesys_info, *filesys_last;
 275 static struct fsck_instance *instance_list;
 276 static char *fsck_path;
 277 static blkid_cache cache;
 278
 279 static char *string_copy(const char *s)
 280 {
 281         char    *ret;
 282
 283         if (!s)
 284                 return 0;
 285         ret = xstrdup(s);
 286         return ret;
 287 }
 288
 289 static int string_to_int(const char *s)
 290 {
 291         long l;
 292         char *p;
 293
 294         l = strtol(s, &p, 0);
 295         if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
 296                 return -1;
 297         else
 298                 return (int) l;
 299 }
 300
 301 static char *skip_over_blank(char *cp)
 302 {
 303         while (*cp && isspace(*cp))
 304                 cp++;
 305         return cp;
 306 }
 307
 308 static char *skip_over_word(char *cp)
 309 {
 310         while (*cp && !isspace(*cp))
 311                 cp++;
 312         return cp;
 313 }
 314
 315 static void strip_line(char *line)
 316 {
 317         char    *p;
 318
 319         while (*line) {
 320                 p = line + strlen(line) - 1;
 321                 if ((*p == '\n') || (*p == '\r'))
 322                         *p = 0;
 323                 else
 324                         break;
 325         }
 326 }
 327
 328 static char *parse_word(char **buf)
 329 {
 330         char *word, *next;
 331
 332         word = *buf;
 333         if (*word == 0)
 334                 return 0;
 335
 336         word = skip_over_blank(word);
 337         next = skip_over_word(word);
 338         if (*next)
 339                 *next++ = 0;
 340         *buf = next;
 341         return word;
 342 }
 343
 344 static void parse_escape(char *word)
 345 {
 346         char    *q, c;
 347         const char *p;
 348
 349         if (!word)
 350                 return;
 351
 352         strcpy_and_process_escape_sequences(word, word);
 353 }
 354
 355 static void free_instance(struct fsck_instance *i)
 356 {
 357         if (i->prog)
 358                 free(i->prog);
 359         if (i->device)
 360                 free(i->device);
 361         if (i->base_device)
 362                 free(i->base_device);
 363         free(i);
 364 }
 365
 366 static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
 367                                         const char *type, const char *opts,
 368                                         int freq, int passno)
 369 {
 370         struct fs_info *fs;
 371
 372         fs = xmalloc(sizeof(struct fs_info));
 373
 374         fs->device = string_copy(device);
 375         fs->mountpt = string_copy(mntpnt);
 376         fs->type = string_copy(type);
 377         fs->opts = string_copy(opts ? opts : "");
 378         fs->freq = freq;
 379         fs->passno = passno;
 380         fs->flags = 0;
 381         fs->next = NULL;
 382
 383         if (!filesys_info)
 384                 filesys_info = fs;
 385         else
 386                 filesys_last->next = fs;
 387         filesys_last = fs;
 388
 389         return fs;
 390 }
 391
 392
 393
 394 static int parse_fstab_line(char *line, struct fs_info **ret_fs)
 395 {
 396         char    *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
 397         struct fs_info *fs;
 398
 399         *ret_fs = 0;
 400         strip_line(line);
 401         if ((cp = strchr(line, '#')))
 402                 *cp = 0;        /* Ignore everything after the comment char */
 403         cp = line;
 404
 405         device = parse_word(&cp);
 406         mntpnt = parse_word(&cp);
 407         type = parse_word(&cp);
 408         opts = parse_word(&cp);
 409         freq = parse_word(&cp);
 410         passno = parse_word(&cp);
 411
 412         if (!device)
 413                 return 0;       /* Allow blank lines */
 414
 415         if (!mntpnt || !type)
 416                 return -1;
 417
 418         parse_escape(device);
 419         parse_escape(mntpnt);
 420         parse_escape(type);
 421         parse_escape(opts);
 422         parse_escape(freq);
 423         parse_escape(passno);
 424
 425         dev = blkid_get_devname(cache, device, NULL);
 426         if (dev)
 427                 device = dev;
 428
 429         if (strchr(type, ','))
 430                 type = 0;
 431
 432         fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
 433                               freq ? atoi(freq) : -1,
 434                               passno ? atoi(passno) : -1);
 435         if (dev)
 436                 free(dev);
 437
 438         if (!fs)
 439                 return -1;
 440         *ret_fs = fs;
 441         return 0;
 442 }
 443
 444 static void interpret_type(struct fs_info *fs)
 445 {
 446         char    *t;
 447
 448         if (strcmp(fs->type, "auto") != 0)
 449                 return;
 450         t = blkid_get_tag_value(cache, "TYPE", fs->device);
 451         if (t) {
 452                 free(fs->type);
 453                 fs->type = t;
 454         }
 455 }
 456
 457 /*
 458  * Load the filesystem database from /etc/fstab
 459  */
 460 static void load_fs_info(const char *filename)
 461 {
 462         FILE    *f;
 463         char    buf[1024];
 464         int     lineno = 0;
 465         int     old_fstab = 1;
 466         struct fs_info *fs;
 467
 468         if ((f = fopen_or_warn(filename, "r")) == NULL) {
 469                 return;
 470         }
 471         while (!feof(f)) {
 472                 lineno++;
 473                 if (!fgets(buf, sizeof(buf), f))
 474                         break;
 475                 buf[sizeof(buf)-1] = 0;
 476                 if (parse_fstab_line(buf, &fs) < 0) {
 477                         bb_error_msg("WARNING: bad format "
 478                                 "on line %d of %s\n", lineno, filename);
 479                         continue;
 480                 }
 481                 if (!fs)
 482                         continue;
 483                 if (fs->passno < 0)
 484                         fs->passno = 0;
 485                 else
 486                         old_fstab = 0;
 487         }
 488
 489         fclose(f);
 490
 491         if (old_fstab) {
 492                 fputs("\007\007\007"
 493                 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
 494                 "       field.  I will kludge around things for you, but you\n"
 495                 "       should fix your /etc/fstab file as soon as you can.\n\n", stderr);
 496
 497                 for (fs = filesys_info; fs; fs = fs->next) {
 498                         fs->passno = 1;
 499                 }
 500         }
 501 }
 502
 503 /* Lookup filesys in /etc/fstab and return the corresponding entry. */
 504 static struct fs_info *lookup(char *filesys)
 505 {
 506         struct fs_info *fs;
 507
 508         /* No filesys name given. */
 509         if (filesys == NULL)
 510                 return NULL;
 511
 512         for (fs = filesys_info; fs; fs = fs->next) {
 513                 if (!strcmp(filesys, fs->device) ||
 514                     (fs->mountpt && !strcmp(filesys, fs->mountpt)))
 515                         break;
 516         }
 517
 518         return fs;
 519 }
 520
 521 /* Find fsck program for a given fs type. */
 522 static char *find_fsck(char *type)
 523 {
 524         char *s;
 525         const char *tpl;
 526         char *p = string_copy(fsck_path);
 527         struct stat st;
 528
 529         /* Are we looking for a program or just a type? */
 530         tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
 531
 532         for (s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
 533                 s = xasprintf(tpl, s, type);
 534                 if (stat(s, &st) == 0) break;
 535                 free(s);
 536         }
 537         free(p);
 538         return s;
 539 }
 540
 541 static int progress_active(void)
 542 {
 543         struct fsck_instance *inst;
 544
 545         for (inst = instance_list; inst; inst = inst->next) {
 546                 if (inst->flags & FLAG_DONE)
 547                         continue;
 548                 if (inst->flags & FLAG_PROGRESS)
 549                         return 1;
 550         }
 551         return 0;
 552 }
 553
 554 /*
 555  * Execute a particular fsck program, and link it into the list of
 556  * child processes we are waiting for.
 557  */
 558 static int execute(const char *type, const char *device, const char *mntpt,
 559                    int interactive)
 560 {
 561         char *s, *argv[80];
 562         char *prog;
 563         int  argc, i;
 564         struct fsck_instance *inst, *p;
 565         pid_t   pid;
 566
 567         inst = xzalloc(sizeof(struct fsck_instance));
 568
 569         prog = xasprintf("fsck.%s", type);
 570         argv[0] = prog;
 571         argc = 1;
 572
 573         for (i=0; i <num_args; i++)
 574                 argv[argc++] = string_copy(args[i]);
 575
 576         if (progress && !progress_active()) {
 577                 if ((strcmp(type, "ext2") == 0) ||
 578                     (strcmp(type, "ext3") == 0)) {
 579                         char tmp[80];
 580                         snprintf(tmp, 80, "-C%d", progress_fd);
 581                         argv[argc++] = string_copy(tmp);
 582                         inst->flags |= FLAG_PROGRESS;
 583                 }
 584         }
 585
 586         argv[argc++] = string_copy(device);
 587         argv[argc] = 0;
 588
 589         s = find_fsck(prog);
 590         if (s == NULL) {
 591                 bb_error_msg("%s: not found", prog);
 592                 return ENOENT;
 593         }
 594
 595         if (verbose || noexecute) {
 596                 printf("[%s (%d) -- %s] ", s, num_running,
 597                        mntpt ? mntpt : device);
 598                 for (i=0; i < argc; i++)
 599                         printf("%s ", argv[i]);
 600                 bb_putchar('\n');
 601         }
 602
 603         /* Fork and execute the correct program. */
 604         if (noexecute)
 605                 pid = -1;
 606         else if ((pid = fork()) < 0) {
 607                 perror("vfork"+1);
 608                 return errno;
 609         } else if (pid == 0) {
 610                 if (!interactive)
 611                         close(0);
 612                 (void) execv(s, argv);
 613                 bb_simple_perror_msg_and_die(argv[0]);
 614         }
 615
 616         for (i = 1; i < argc; i++)
 617                 free(argv[i]);
 618
 619         free(s);
 620         inst->pid = pid;
 621         inst->prog = prog;
 622         inst->type = string_copy(type);
 623         inst->device = string_copy(device);
 624         inst->base_device = base_device(device);
 625         inst->start_time = time(0);
 626         inst->next = NULL;
 627
 628         /*
 629          * Find the end of the list, so we add the instance on at the end.
 630          */
 631         for (p = instance_list; p && p->next; p = p->next);
 632
 633         if (p)
 634                 p->next = inst;
 635         else
 636                 instance_list = inst;
 637
 638         return 0;
 639 }
 640
 641 /*
 642  * Send a signal to all outstanding fsck child processes
 643  */
 644 static int kill_all(int signum)
 645 {
 646         struct fsck_instance *inst;
 647         int     n = 0;
 648
 649         for (inst = instance_list; inst; inst = inst->next) {
 650                 if (inst->flags & FLAG_DONE)
 651                         continue;
 652                 kill(inst->pid, signum);
 653                 n++;
 654         }
 655         return n;
 656 }
 657
 658 /*
 659  * Wait for one child process to exit; when it does, unlink it from
 660  * the list of executing child processes, and return it.
 661  */
 662 static struct fsck_instance *wait_one(int flags)
 663 {
 664         int     status;
 665         int     sig;
 666         struct fsck_instance *inst, *inst2, *prev;
 667         pid_t   pid;
 668
 669         if (!instance_list)
 670                 return NULL;
 671
 672         if (noexecute) {
 673                 inst = instance_list;
 674                 prev = 0;
 675 #ifdef RANDOM_DEBUG
 676                 while (inst->next && (random() & 1)) {
 677                         prev = inst;
 678                         inst = inst->next;
 679                 }
 680 #endif
 681                 inst->exit_status = 0;
 682                 goto ret_inst;
 683         }
 684
 685         /*
 686          * gcc -Wall fails saving throw against stupidity
 687          * (inst and prev are thought to be uninitialized variables)
 688          */
 689         inst = prev = NULL;
 690
 691         do {
 692                 pid = waitpid(-1, &status, flags);
 693                 if (cancel_requested && !kill_sent) {
 694                         kill_all(SIGTERM);
 695                         kill_sent++;
 696                 }
 697                 if ((pid == 0) && (flags & WNOHANG))
 698                         return NULL;
 699                 if (pid < 0) {
 700                         if ((errno == EINTR) || (errno == EAGAIN))
 701                                 continue;
 702                         if (errno == ECHILD) {
 703                                 bb_error_msg("wait: no more child process?!?");
 704                                 return NULL;
 705                         }
 706                         perror("wait");
 707                         continue;
 708                 }
 709                 for (prev = 0, inst = instance_list;
 710                      inst;
 711                      prev = inst, inst = inst->next) {
 712                         if (inst->pid == pid)
 713                                 break;
 714                 }
 715         } while (!inst);
 716
 717         if (WIFEXITED(status))
 718                 status = WEXITSTATUS(status);
 719         else if (WIFSIGNALED(status)) {
 720                 sig = WTERMSIG(status);
 721                 if (sig == SIGINT) {
 722                         status = EXIT_UNCORRECTED;
 723                 } else {
 724                         printf("Warning... %s for device %s exited "
 725                                "with signal %d.\n",
 726                                inst->prog, inst->device, sig);
 727                         status = EXIT_ERROR;
 728                 }
 729         } else {
 730                 printf("%s %s: status is %x, should never happen.\n",
 731                        inst->prog, inst->device, status);
 732                 status = EXIT_ERROR;
 733         }
 734         inst->exit_status = status;
 735         if (progress && (inst->flags & FLAG_PROGRESS) &&
 736             !progress_active()) {
 737                 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
 738                         if (inst2->flags & FLAG_DONE)
 739                                 continue;
 740                         if (strcmp(inst2->type, "ext2") &&
 741                             strcmp(inst2->type, "ext3"))
 742                                 continue;
 743                         /*
 744                          * If we've just started the fsck, wait a tiny
 745                          * bit before sending the kill, to give it
 746                          * time to set up the signal handler
 747                          */
 748                         if (inst2->start_time < time(0)+2) {
 749                                 if (fork() == 0) {
 750                                         sleep(1);
 751                                         kill(inst2->pid, SIGUSR1);
 752                                         exit(0);
 753                                 }
 754                         } else
 755                                 kill(inst2->pid, SIGUSR1);
 756                         inst2->flags |= FLAG_PROGRESS;
 757                         break;
 758                 }
 759         }
 760 ret_inst:
 761         if (prev)
 762                 prev->next = inst->next;
 763         else
 764                 instance_list = inst->next;
 765         if (verbose > 1)
 766                 printf("Finished with %s (exit status %d)\n",
 767                        inst->device, inst->exit_status);
 768         num_running--;
 769         return inst;
 770 }
 771
 772 #define FLAG_WAIT_ALL           0
 773 #define FLAG_WAIT_ATLEAST_ONE   1
 774 /*
 775  * Wait until all executing child processes have exited; return the
 776  * logical OR of all of their exit code values.
 777  */
 778 static int wait_many(int flags)
 779 {
 780         struct fsck_instance *inst;
 781         int     global_status = 0;
 782         int     wait_flags = 0;
 783
 784         while ((inst = wait_one(wait_flags))) {
 785                 global_status |= inst->exit_status;
 786                 free_instance(inst);
 787 #ifdef RANDOM_DEBUG
 788                 if (noexecute && (flags & WNOHANG) && !(random() % 3))
 789                         break;
 790 #endif
 791                 if (flags & FLAG_WAIT_ATLEAST_ONE)
 792                         wait_flags = WNOHANG;
 793         }
 794         return global_status;
 795 }
 796
 797 /*
 798  * Run the fsck program on a particular device
 799  *
 800  * If the type is specified using -t, and it isn't prefixed with "no"
 801  * (as in "noext2") and only one filesystem type is specified, then
 802  * use that type regardless of what is specified in /etc/fstab.
 803  *
 804  * If the type isn't specified by the user, then use either the type
 805  * specified in /etc/fstab, or DEFAULT_FSTYPE.
 806  */
 807 static void fsck_device(struct fs_info *fs, int interactive)
 808 {
 809         const char *type;
 810         int retval;
 811
 812         interpret_type(fs);
 813
 814         if (strcmp(fs->type, "auto") != 0)
 815                 type = fs->type;
 816         else if (fstype && strncmp(fstype, "no", 2) &&
 817             strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
 818             !strchr(fstype, ','))
 819                 type = fstype;
 820         else
 821                 type = DEFAULT_FSTYPE;
 822
 823         num_running++;
 824         retval = execute(type, fs->device, fs->mountpt, interactive);
 825         if (retval) {
 826                 bb_error_msg("error %d while executing fsck.%s for %s",
 827                                                 retval, type, fs->device);
 828                 num_running--;
 829         }
 830 }
 831
 832
 833 /*
 834  * Deal with the fsck -t argument.
 835  */
 836 struct fs_type_compile {
 837         char **list;
 838         int *type;
 839         int  negate;
 840 } fs_type_compiled;
 841
 842 #define FS_TYPE_NORMAL  0
 843 #define FS_TYPE_OPT     1
 844 #define FS_TYPE_NEGOPT  2
 845
 846 static const char fs_type_syntax_error[] =
 847 "Either all or none of the filesystem types passed to -t must be prefixed\n"
 848    "with 'no' or '!'.";
 849
 850 static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
 851 {
 852         char    *cp, *list, *s;
 853         int     num = 2;
 854         int     negate, first_negate = 1;
 855
 856         if (fs_type) {
 857                 for (cp=fs_type; *cp; cp++) {
 858                         if (*cp == ',')
 859                                 num++;
 860                 }
 861         }
 862
 863         cmp->list = xzalloc(num * sizeof(char *));
 864         cmp->type = xzalloc(num * sizeof(int));
 865         cmp->negate = 0;
 866
 867         if (!fs_type)
 868                 return;
 869
 870         list = string_copy(fs_type);
 871         num = 0;
 872         s = strtok(list, ",");
 873         while (s) {
 874                 negate = 0;
 875                 if (strncmp(s, "no", 2) == 0) {
 876                         s += 2;
 877                         negate = 1;
 878                 } else if (*s == '!') {
 879                         s++;
 880                         negate = 1;
 881                 }
 882                 if (strcmp(s, "loop") == 0)
 883                         /* loop is really short-hand for opts=loop */
 884                         goto loop_special_case;
 885                 else if (strncmp(s, "opts=", 5) == 0) {
 886                         s += 5;
 887                 loop_special_case:
 888                         cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
 889                 } else {
 890                         if (first_negate) {
 891                                 cmp->negate = negate;
 892                                 first_negate = 0;
 893                         }
 894                         if ((negate && !cmp->negate) ||
 895                             (!negate && cmp->negate)) {
 896                                 bb_error_msg_and_die("%s", fs_type_syntax_error);
 897                         }
 898                 }
 899                 cmp->list[num++] = string_copy(s);
 900                 s = strtok(NULL, ",");
 901         }
 902         free(list);
 903 }
 904
 905 /*
 906  * This function returns true if a particular option appears in a
 907  * comma-delimited options list
 908  */
 909 static int opt_in_list(char *opt, char *optlist)
 910 {
 911         char    *list, *s;
 912
 913         if (!optlist)
 914                 return 0;
 915         list = string_copy(optlist);
 916
 917         s = strtok(list, ",");
 918         while (s) {
 919                 if (strcmp(s, opt) == 0) {
 920                         free(list);
 921                         return 1;
 922                 }
 923                 s = strtok(NULL, ",");
 924         }
 925         free(list);
 926         return 0;
 927 }
 928
 929 /* See if the filesystem matches the criteria given by the -t option */
 930 static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
 931 {
 932         int n, ret = 0, checked_type = 0;
 933         char *cp;
 934
 935         if (cmp->list == 0 || cmp->list[0] == 0)
 936                 return 1;
 937
 938         for (n=0; (cp = cmp->list[n]); n++) {
 939                 switch (cmp->type[n]) {
 940                 case FS_TYPE_NORMAL:
 941                         checked_type++;
 942                         if (strcmp(cp, fs->type) == 0) {
 943                                 ret = 1;
 944                         }
 945                         break;
 946                 case FS_TYPE_NEGOPT:
 947                         if (opt_in_list(cp, fs->opts))
 948                                 return 0;
 949                         break;
 950                 case FS_TYPE_OPT:
 951                         if (!opt_in_list(cp, fs->opts))
 952                                 return 0;
 953                         break;
 954                 }
 955         }
 956         if (checked_type == 0)
 957                 return 1;
 958         return (cmp->negate ? !ret : ret);
 959 }
 960
 961 /* Check if we should ignore this filesystem. */
 962 static int ignore(struct fs_info *fs)
 963 {
 964         int wanted;
 965         char *s;
 966
 967         /*
 968          * If the pass number is 0, ignore it.
 969          */
 970         if (fs->passno == 0)
 971                 return 1;
 972
 973         interpret_type(fs);
 974
 975         /*
 976          * If a specific fstype is specified, and it doesn't match,
 977          * ignore it.
 978          */
 979         if (!fs_match(fs, &fs_type_compiled)) return 1;
 980
 981         /* Are we ignoring this type? */
 982         if (index_in_str_array(ignored_types, fs->type) >= 0)
 983                 return 1;
 984
 985         /* Do we really really want to check this fs? */
 986         wanted = index_in_str_array(really_wanted, fs->type) >= 0;
 987
 988         /* See if the <fsck.fs> program is available. */
 989         s = find_fsck(fs->type);
 990         if (s == NULL) {
 991                 if (wanted)
 992                         bb_error_msg("can't check %s: fsck.%s not found",
 993                                 fs->device, fs->type);
 994                 return 1;
 995         }
 996         free(s);
 997
 998         /* We can and want to check this file system type. */
 999         return 0;
1000 }
1001
1002 /*
1003  * Returns TRUE if a partition on the same disk is already being
1004  * checked.
1005  */
1006 static int device_already_active(char *device)
1007 {
1008         struct fsck_instance *inst;
1009         char *base;
1010
1011         if (force_all_parallel)
1012                 return 0;
1013
1014 #ifdef BASE_MD
1015         /* Don't check a soft raid disk with any other disk */
1016         if (instance_list &&
1017             (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
1018              !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
1019                 return 1;
1020 #endif
1021
1022         base = base_device(device);
1023         /*
1024          * If we don't know the base device, assume that the device is
1025          * already active if there are any fsck instances running.
1026          */
1027         if (!base)
1028                 return (instance_list != 0);
1029         for (inst = instance_list; inst; inst = inst->next) {
1030                 if (!inst->base_device || !strcmp(base, inst->base_device)) {
1031                         free(base);
1032                         return 1;
1033                 }
1034         }
1035         free(base);
1036         return 0;
1037 }
1038
1039 /* Check all file systems, using the /etc/fstab table. */
1040 static int check_all(void)
1041 {
1042         struct fs_info *fs = NULL;
1043         int status = EXIT_OK;
1044         int not_done_yet = 1;
1045         int passno = 1;
1046         int pass_done;
1047
1048         if (verbose)
1049                 fputs("Checking all file systems.\n", stdout);
1050
1051         /*
1052          * Do an initial scan over the filesystem; mark filesystems
1053          * which should be ignored as done, and resolve any "auto"
1054          * filesystem types (done as a side-effect of calling ignore()).
1055          */
1056         for (fs = filesys_info; fs; fs = fs->next) {
1057                 if (ignore(fs))
1058                         fs->flags |= FLAG_DONE;
1059         }
1060
1061         /*
1062          * Find and check the root filesystem.
1063          */
1064         if (!parallel_root) {
1065                 for (fs = filesys_info; fs; fs = fs->next) {
1066                         if (LONE_CHAR(fs->mountpt, '/'))
1067                                 break;
1068                 }
1069                 if (fs) {
1070                         if (!skip_root && !ignore(fs)) {
1071                                 fsck_device(fs, 1);
1072                                 status |= wait_many(FLAG_WAIT_ALL);
1073                                 if (status > EXIT_NONDESTRUCT)
1074                                         return status;
1075                         }
1076                         fs->flags |= FLAG_DONE;
1077                 }
1078         }
1079         /*
1080          * This is for the bone-headed user who enters the root
1081          * filesystem twice.  Skip root will skep all root entries.
1082          */
1083         if (skip_root)
1084                 for (fs = filesys_info; fs; fs = fs->next)
1085                         if (LONE_CHAR(fs->mountpt, '/'))
1086                                 fs->flags |= FLAG_DONE;
1087
1088         while (not_done_yet) {
1089                 not_done_yet = 0;
1090                 pass_done = 1;
1091
1092                 for (fs = filesys_info; fs; fs = fs->next) {
1093                         if (cancel_requested)
1094                                 break;
1095                         if (fs->flags & FLAG_DONE)
1096                                 continue;
1097                         /*
1098                          * If the filesystem's pass number is higher
1099                          * than the current pass number, then we don't
1100                          * do it yet.
1101                          */
1102                         if (fs->passno > passno) {
1103                                 not_done_yet++;
1104                                 continue;
1105                         }
1106                         /*
1107                          * If a filesystem on a particular device has
1108                          * already been spawned, then we need to defer
1109                          * this to another pass.
1110                          */
1111                         if (device_already_active(fs->device)) {
1112                                 pass_done = 0;
1113                                 continue;
1114                         }
1115                         /*
1116                          * Spawn off the fsck process
1117                          */
1118                         fsck_device(fs, serialize);
1119                         fs->flags |= FLAG_DONE;
1120
1121                         /*
1122                          * Only do one filesystem at a time, or if we
1123                          * have a limit on the number of fsck's extant
1124                          * at one time, apply that limit.
1125                          */
1126                         if (serialize ||
1127                             (max_running && (num_running >= max_running))) {
1128                                 pass_done = 0;
1129                                 break;
1130                         }
1131                 }
1132                 if (cancel_requested)
1133                         break;
1134                 if (verbose > 1)
1135                         printf("--waiting-- (pass %d)\n", passno);
1136                 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1137                                     FLAG_WAIT_ATLEAST_ONE);
1138                 if (pass_done) {
1139                         if (verbose > 1)
1140                                 printf("----------------------------------\n");
1141                         passno++;
1142                 } else
1143                         not_done_yet++;
1144         }
1145         if (cancel_requested && !kill_sent) {
1146                 kill_all(SIGTERM);
1147                 kill_sent++;
1148         }
1149         status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1150         return status;
1151 }
1152
1153 static void signal_cancel(int sig FSCK_ATTR((unused)))
1154 {
1155         cancel_requested++;
1156 }
1157
1158 static void PRS(int argc, char **argv)
1159 {
1160         int     i, j;
1161         char    *arg, *dev, *tmp = NULL;
1162         char    options[128];
1163         int     opt = 0;
1164         int     opts_for_fsck = 0;
1165         struct sigaction        sa;
1166
1167         /*
1168          * Set up signal action
1169          */
1170         memset(&sa, 0, sizeof(struct sigaction));
1171         sa.sa_handler = signal_cancel;
1172         sigaction(SIGINT, &sa, 0);
1173         sigaction(SIGTERM, &sa, 0);
1174
1175         num_devices = 0;
1176         num_args = 0;
1177         instance_list = 0;
1178
1179         for (i=1; i < argc; i++) {
1180                 arg = argv[i];
1181                 if (!arg)
1182                         continue;
1183                 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1184                         if (num_devices >= MAX_DEVICES) {
1185                                 bb_error_msg_and_die("too many devices");
1186                         }
1187                         dev = blkid_get_devname(cache, arg, NULL);
1188                         if (!dev && strchr(arg, '=')) {
1189                                 /*
1190                                  * Check to see if we failed because
1191                                  * /proc/partitions isn't found.
1192                                  */
1193                                 if (access("/proc/partitions", R_OK) < 0) {
1194                                         bb_perror_msg_and_die("can't open /proc/partitions "
1195                                                         "(is /proc mounted?)");
1196                                 }
1197                                 /*
1198                                  * Check to see if this is because
1199                                  * we're not running as root
1200                                  */
1201                                 if (geteuid())
1202                                         bb_error_msg_and_die(
1203                 "must be root to scan for matching filesystems: %s\n", arg);
1204                                 else
1205                                         bb_error_msg_and_die(
1206                 "can't find matching filesystem: %s", arg);
1207                         }
1208                         devices[num_devices++] = dev ? dev : string_copy(arg);
1209                         continue;
1210                 }
1211                 if (arg[0] != '-' || opts_for_fsck) {
1212                         if (num_args >= MAX_ARGS) {
1213                                 bb_error_msg_and_die("too many arguments");
1214                         }
1215                         args[num_args++] = string_copy(arg);
1216                         continue;
1217                 }
1218                 for (j=1; arg[j]; j++) {
1219                         if (opts_for_fsck) {
1220                                 options[++opt] = arg[j];
1221                                 continue;
1222                         }
1223                         switch (arg[j]) {
1224                         case 'A':
1225                                 doall++;
1226                                 break;
1227                         case 'C':
1228                                 progress++;
1229                                 if (arg[j+1]) {
1230                                         progress_fd = string_to_int(arg+j+1);
1231                                         if (progress_fd < 0)
1232                                                 progress_fd = 0;
1233                                         else
1234                                                 goto next_arg;
1235                                 } else if ((i+1) < argc
1236                                  && argv[i+1][0] != '-') {
1237                                         progress_fd = string_to_int(argv[i]);
1238                                         if (progress_fd < 0)
1239                                                 progress_fd = 0;
1240                                         else {
1241                                                 goto next_arg;
1242                                         }
1243                                 }
1244                                 break;
1245                         case 'V':
1246                                 verbose++;
1247                                 break;
1248                         case 'N':
1249                                 noexecute++;
1250                                 break;
1251                         case 'R':
1252                                 skip_root++;
1253                                 break;
1254                         case 'T':
1255                                 notitle++;
1256                                 break;
1257                         case 'M':
1258                                 like_mount++;
1259                                 break;
1260                         case 'P':
1261                                 parallel_root++;
1262                                 break;
1263                         case 's':
1264                                 serialize++;
1265                                 break;
1266                         case 't':
1267                                 tmp = 0;
1268                                 if (fstype)
1269                                         bb_show_usage();
1270                                 if (arg[j+1])
1271                                         tmp = arg+j+1;
1272                                 else if ((i+1) < argc)
1273                                         tmp = argv[++i];
1274                                 else
1275                                         bb_show_usage();
1276                                 fstype = string_copy(tmp);
1277                                 compile_fs_type(fstype, &fs_type_compiled);
1278                                 goto next_arg;
1279                         case '-':
1280                                 opts_for_fsck++;
1281                                 break;
1282                         case '?':
1283                                 bb_show_usage();
1284                                 break;
1285                         default:
1286                                 options[++opt] = arg[j];
1287                                 break;
1288                         }
1289                 }
1290         next_arg:
1291                 if (opt) {
1292                         options[0] = '-';
1293                         options[++opt] = '\0';
1294                         if (num_args >= MAX_ARGS) {
1295                                 bb_error_msg("too many arguments");
1296                         }
1297                         args[num_args++] = string_copy(options);
1298                         opt = 0;
1299                 }
1300         }
1301         if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1302                 force_all_parallel++;
1303         if ((tmp = getenv("FSCK_MAX_INST")))
1304             max_running = atoi(tmp);
1305 }
1306
1307 int fsck_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1308 int fsck_main(int argc, char **argv)
1309 {
1310         int i, status = 0;
1311         int interactive = 0;
1312         const char *fstab;
1313         struct fs_info *fs;
1314
1315         setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1316         setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1317
1318         blkid_get_cache(&cache, NULL);
1319         PRS(argc, argv);
1320
1321         if (!notitle)
1322                 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1323
1324         fstab = getenv("FSTAB_FILE");
1325         if (!fstab)
1326                 fstab = _PATH_MNTTAB;
1327         load_fs_info(fstab);
1328
1329         fsck_path = e2fs_set_sbin_path();
1330
1331         if ((num_devices == 1) || (serialize))
1332                 interactive = 1;
1333
1334         /* If -A was specified ("check all"), do that! */
1335         if (doall)
1336                 return check_all();
1337
1338         if (num_devices == 0) {
1339                 serialize++;
1340                 interactive++;
1341                 return check_all();
1342         }
1343         for (i = 0; i < num_devices; i++) {
1344                 if (cancel_requested) {
1345                         if (!kill_sent) {
1346                                 kill_all(SIGTERM);
1347                                 kill_sent++;
1348                         }
1349                         break;
1350                 }
1351                 fs = lookup(devices[i]);
1352                 if (!fs) {
1353                         fs = create_fs_device(devices[i], 0, "auto",
1354                                               0, -1, -1);
1355                         if (!fs)
1356                                 continue;
1357                 }
1358                 fsck_device(fs, interactive);
1359                 if (serialize ||
1360                     (max_running && (num_running >= max_running))) {
1361                         struct fsck_instance *inst;
1362
1363                         inst = wait_one(0);
1364                         if (inst) {
1365                                 status |= inst->exit_status;
1366                                 free_instance(inst);
1367                         }
1368                         if (verbose > 1)
1369                                 printf("----------------------------------\n");
1370                 }
1371         }
1372         status |= wait_many(FLAG_WAIT_ALL);
1373         blkid_put_cache(cache);
1374         return status;
1375 }