1/* vi: set sw=4 ts=4: */ 2/* 3 * fsck --- 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 tarball for details. 24 */ 25 26/* All filesystem specific hooks have been removed. 27 * If filesystem cannot be determined, we will execute 28 * "fsck.auto". Currently this also happens if you specify 29 * UUID=xxx or LABEL=xxx as an object to check. 30 * Detection code for that is also probably has to be in fsck.auto. 31 * 32 * In other words, this is _really_ is just a driver program which 33 * spawns actual fsck.something for each filesystem to check. 34 * It doesn't guess filesystem types from on-disk format. 35 */ 36 37#include "libbb.h" 38 39/* "progress indicator" code is somewhat buggy and ext[23] specific. 40 * We should be filesystem agnostic. IOW: there should be a well-defined 41 * API for fsck.something, NOT ad-hoc hacks in generic fsck. */ 42#define DO_PROGRESS_INDICATOR 0 43 44/* fsck 1.41.4 (27-Jan-2009) manpage says: 45 * 0 - No errors 46 * 1 - File system errors corrected 47 * 2 - System should be rebooted 48 * 4 - File system errors left uncorrected 49 * 8 - Operational error 50 * 16 - Usage or syntax error 51 * 32 - Fsck canceled by user request 52 * 128 - Shared library error 53 */ 54#define EXIT_OK 0 55#define EXIT_NONDESTRUCT 1 56#define EXIT_DESTRUCT 2 57#define EXIT_UNCORRECTED 4 58#define EXIT_ERROR 8 59#define EXIT_USAGE 16 60#define FSCK_CANCELED 32 /* Aborted with a signal or ^C */ 61 62/* 63 * Internal structure for mount table entries. 64 */ 65struct fs_info { 66 struct fs_info *next; 67 char *device; 68 char *mountpt; 69 char *type; 70 char *opts; 71 int passno; 72 int flags; 73}; 74 75#define FLAG_DONE 1 76#define FLAG_PROGRESS 2 77/* 78 * Structure to allow exit codes to be stored 79 */ 80struct fsck_instance { 81 struct fsck_instance *next; 82 int pid; 83 int flags; 84#if DO_PROGRESS_INDICATOR 85 time_t start_time; 86#endif 87 char *prog; 88 char *device; 89 char *base_device; /* /dev/hda for /dev/hdaN etc */ 90}; 91 92static const char ignored_types[] ALIGN1 = 93 "ignore\0" 94 "iso9660\0" 95 "nfs\0" 96 "proc\0" 97 "sw\0" 98 "swap\0" 99 "tmpfs\0" 100 "devpts\0"; 101 102#if 0 103static const char really_wanted[] ALIGN1 = 104 "minix\0" 105 "ext2\0" 106 "ext3\0" 107 "jfs\0" 108 "reiserfs\0" 109 "xiafs\0" 110 "xfs\0"; 111#endif 112 113#define BASE_MD "/dev/md" 114 115static char **args; 116static int num_args; 117static int verbose; 118 119#define FS_TYPE_FLAG_NORMAL 0 120#define FS_TYPE_FLAG_OPT 1 121#define FS_TYPE_FLAG_NEGOPT 2 122static char **fs_type_list; 123static uint8_t *fs_type_flag; 124static smallint fs_type_negated; 125 126static smallint noexecute; 127static smallint serialize; 128static smallint skip_root; 129/* static smallint like_mount; */ 130static smallint parallel_root; 131static smallint force_all_parallel; 132 133#if DO_PROGRESS_INDICATOR 134static smallint progress; 135static int progress_fd; 136#endif 137 138static int num_running; 139static int max_running; 140static char *fstype; 141static struct fs_info *filesys_info; 142static struct fs_info *filesys_last; 143static struct fsck_instance *instance_list; 144 145/* 146 * Return the "base device" given a particular device; this is used to 147 * assure that we only fsck one partition on a particular drive at any 148 * one time. Otherwise, the disk heads will be seeking all over the 149 * place. If the base device cannot be determined, return NULL. 150 * 151 * The base_device() function returns an allocated string which must 152 * be freed. 153 */ 154#if ENABLE_FEATURE_DEVFS 155/* 156 * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3 157 * pathames. 158 */ 159static const char *const devfs_hier[] = { 160 "host", "bus", "target", "lun", NULL 161}; 162#endif 163 164static char *base_device(const char *device) 165{ 166 char *str, *cp; 167#if ENABLE_FEATURE_DEVFS 168 const char *const *hier; 169 const char *disk; 170 int len; 171#endif 172 str = xstrdup(device); 173 174 /* Skip over "/dev/"; if it's not present, give up */ 175 cp = skip_dev_pfx(str); 176 if (cp == str) 177 goto errout; 178 179 /* 180 * For md devices, we treat them all as if they were all 181 * on one disk, since we don't know how to parallelize them. 182 */ 183 if (cp[0] == 'm' && cp[1] == 'd') { 184 cp[2] = 0; 185 return str; 186 } 187 188 /* Handle DAC 960 devices */ 189 if (strncmp(cp, "rd/", 3) == 0) { 190 cp += 3; 191 if (cp[0] != 'c' || !isdigit(cp[1]) 192 || cp[2] != 'd' || !isdigit(cp[3])) 193 goto errout; 194 cp[4] = 0; 195 return str; 196 } 197 198 /* Now let's handle /dev/hd* and /dev/sd* devices.... */ 199 if ((cp[0] == 'h' || cp[0] == 's') && cp[1] == 'd') { 200 cp += 2; 201 /* If there's a single number after /dev/hd, skip it */ 202 if (isdigit(*cp)) 203 cp++; 204 /* What follows must be an alpha char, or give up */ 205 if (!isalpha(*cp)) 206 goto errout; 207 cp[1] = 0; 208 return str; 209 } 210 211#if ENABLE_FEATURE_DEVFS 212 /* Now let's handle devfs (ugh) names */ 213 len = 0; 214 if (strncmp(cp, "ide/", 4) == 0) 215 len = 4; 216 if (strncmp(cp, "scsi/", 5) == 0) 217 len = 5; 218 if (len) { 219 cp += len; 220 /* 221 * Now we proceed down the expected devfs hierarchy. 222 * i.e., .../host1/bus2/target3/lun4/... 223 * If we don't find the expected token, followed by 224 * some number of digits at each level, abort. 225 */ 226 for (hier = devfs_hier; *hier; hier++) { 227 len = strlen(*hier); 228 if (strncmp(cp, *hier, len) != 0) 229 goto errout; 230 cp += len; 231 while (*cp != '/' && *cp != 0) { 232 if (!isdigit(*cp)) 233 goto errout; 234 cp++; 235 } 236 cp++; 237 } 238 cp[-1] = 0; 239 return str; 240 } 241 242 /* Now handle devfs /dev/disc or /dev/disk names */ 243 disk = 0; 244 if (strncmp(cp, "discs/", 6) == 0) 245 disk = "disc"; 246 else if (strncmp(cp, "disks/", 6) == 0) 247 disk = "disk"; 248 if (disk) { 249 cp += 6; 250 if (strncmp(cp, disk, 4) != 0) 251 goto errout; 252 cp += 4; 253 while (*cp != '/' && *cp != 0) { 254 if (!isdigit(*cp)) 255 goto errout; 256 cp++; 257 } 258 *cp = 0; 259 return str; 260 } 261#endif 262 errout: 263 free(str); 264 return NULL; 265} 266 267static void free_instance(struct fsck_instance *p) 268{ 269 free(p->prog); 270 free(p->device); 271 free(p->base_device); 272 free(p); 273} 274 275static struct fs_info *create_fs_device(const char *device, const char *mntpnt, 276 const char *type, const char *opts, 277 int passno) 278{ 279 struct fs_info *fs; 280 281 fs = xzalloc(sizeof(*fs)); 282 fs->device = xstrdup(device); 283 fs->mountpt = xstrdup(mntpnt); 284 if (strchr(type, ',')) 285 type = (char *)"auto"; 286 fs->type = xstrdup(type); 287 fs->opts = xstrdup(opts ? opts : ""); 288 fs->passno = passno < 0 ? 1 : passno; 289 /*fs->flags = 0; */ 290 /*fs->next = NULL; */ 291 292 if (!filesys_info) 293 filesys_info = fs; 294 else 295 filesys_last->next = fs; 296 filesys_last = fs; 297 298 return fs; 299} 300 301/* Load the filesystem database from /etc/fstab */ 302static void load_fs_info(const char *filename) 303{ 304 FILE *fstab; 305 struct mntent mte; 306 struct fs_info *fs; 307 308 fstab = setmntent(filename, "r"); 309 if (!fstab) { 310 bb_perror_msg("can't read '%s'", filename); 311 return; 312 } 313 314 // Loop through entries 315 while (getmntent_r(fstab, &mte, bb_common_bufsiz1, COMMON_BUFSIZE)) { 316 //bb_info_msg("CREATE[%s][%s][%s][%s][%d]", mte.mnt_fsname, mte.mnt_dir, 317 // mte.mnt_type, mte.mnt_opts, 318 // mte.mnt_passno); 319 fs = create_fs_device(mte.mnt_fsname, mte.mnt_dir, 320 mte.mnt_type, mte.mnt_opts, 321 mte.mnt_passno); 322 } 323 endmntent(fstab); 324} 325 326/* Lookup filesys in /etc/fstab and return the corresponding entry. */ 327static struct fs_info *lookup(char *filesys) 328{ 329 struct fs_info *fs; 330 331 for (fs = filesys_info; fs; fs = fs->next) { 332 if (strcmp(filesys, fs->device) == 0 333 || (fs->mountpt && strcmp(filesys, fs->mountpt) == 0) 334 ) 335 break; 336 } 337 338 return fs; 339} 340 341#if DO_PROGRESS_INDICATOR 342static int progress_active(void) 343{ 344 struct fsck_instance *inst; 345 346 for (inst = instance_list; inst; inst = inst->next) { 347 if (inst->flags & FLAG_DONE) 348 continue; 349 if (inst->flags & FLAG_PROGRESS) 350 return 1; 351 } 352 return 0; 353} 354#endif 355 356 357/* 358 * Send a signal to all outstanding fsck child processes 359 */ 360static void kill_all_if_got_signal(void) 361{ 362 static smallint kill_sent; 363 364 struct fsck_instance *inst; 365 366 if (!bb_got_signal || kill_sent) 367 return; 368 369 for (inst = instance_list; inst; inst = inst->next) { 370 if (inst->flags & FLAG_DONE) 371 continue; 372 kill(inst->pid, SIGTERM); 373 } 374 kill_sent = 1; 375} 376 377/* 378 * Wait for one child process to exit; when it does, unlink it from 379 * the list of executing child processes, free, and return its exit status. 380 * If there is no exited child, return -1. 381 */ 382static int wait_one(int flags) 383{ 384 int status; 385 int sig; 386 struct fsck_instance *inst, *prev; 387 pid_t pid; 388 389 if (!instance_list) 390 return -1; 391 /* if (noexecute) { already returned -1; } */ 392 393 while (1) { 394 pid = waitpid(-1, &status, flags); 395 kill_all_if_got_signal(); 396 if (pid == 0) /* flags == WNOHANG and no children exited */ 397 return -1; 398 if (pid < 0) { 399 if (errno == EINTR) 400 continue; 401 if (errno == ECHILD) { /* paranoia */ 402 bb_error_msg("wait: no more children"); 403 return -1; 404 } 405 bb_perror_msg("wait"); 406 continue; 407 } 408 prev = NULL; 409 inst = instance_list; 410 do { 411 if (inst->pid == pid) 412 goto child_died; 413 prev = inst; 414 inst = inst->next; 415 } while (inst); 416 } 417 child_died: 418 419 if (WIFEXITED(status)) 420 status = WEXITSTATUS(status); 421 else if (WIFSIGNALED(status)) { 422 sig = WTERMSIG(status); 423 status = EXIT_UNCORRECTED; 424 if (sig != SIGINT) { 425 printf("Warning: %s %s terminated " 426 "by signal %d\n", 427 inst->prog, inst->device, sig); 428 status = EXIT_ERROR; 429 } 430 } else { 431 printf("%s %s: status is %x, should never happen\n", 432 inst->prog, inst->device, status); 433 status = EXIT_ERROR; 434 } 435 436#if DO_PROGRESS_INDICATOR 437 if (progress && (inst->flags & FLAG_PROGRESS) && !progress_active()) { 438 struct fsck_instance *inst2; 439 for (inst2 = instance_list; inst2; inst2 = inst2->next) { 440 if (inst2->flags & FLAG_DONE) 441 continue; 442 if (strcmp(inst2->type, "ext2") != 0 443 && strcmp(inst2->type, "ext3") != 0 444 ) { 445 continue; 446 } 447 /* ext[23], we will send USR1 448 * (request to start displaying progress bar) 449 * 450 * If we've just started the fsck, wait a tiny 451 * bit before sending the kill, to give it 452 * time to set up the signal handler 453 */ 454 if (inst2->start_time >= time(NULL) - 1) 455 sleep(1); 456 kill(inst2->pid, SIGUSR1); 457 inst2->flags |= FLAG_PROGRESS; 458 break; 459 } 460 } 461#endif 462 463 if (prev) 464 prev->next = inst->next; 465 else 466 instance_list = inst->next; 467 if (verbose > 1) 468 printf("Finished with %s (exit status %d)\n", 469 inst->device, status); 470 num_running--; 471 free_instance(inst); 472 473 return status; 474} 475 476/* 477 * Wait until all executing child processes have exited; return the 478 * logical OR of all of their exit code values. 479 */ 480#define FLAG_WAIT_ALL 0 481#define FLAG_WAIT_ATLEAST_ONE WNOHANG 482static int wait_many(int flags) 483{ 484 int exit_status; 485 int global_status = 0; 486 int wait_flags = 0; 487 488 while ((exit_status = wait_one(wait_flags)) != -1) { 489 global_status |= exit_status; 490 wait_flags |= flags; 491 } 492 return global_status; 493} 494 495/* 496 * Execute a particular fsck program, and link it into the list of 497 * child processes we are waiting for. 498 */ 499static void execute(const char *type, const char *device, 500 const char *mntpt /*, int interactive */) 501{ 502 int i; 503 struct fsck_instance *inst; 504 pid_t pid; 505 506 args[0] = xasprintf("fsck.%s", type); 507 508#if DO_PROGRESS_INDICATOR 509 if (progress && !progress_active()) { 510 if (strcmp(type, "ext2") == 0 511 || strcmp(type, "ext3") == 0 512 ) { 513 args[XXX] = xasprintf("-C%d", progress_fd); /* 1 */ 514 inst->flags |= FLAG_PROGRESS; 515 } 516 } 517#endif 518 519 args[num_args - 2] = (char*)device; 520 /* args[num_args - 1] = NULL; - already is */ 521 522 if (verbose || noexecute) { 523 printf("[%s (%d) -- %s]", args[0], num_running, 524 mntpt ? mntpt : device); 525 for (i = 0; args[i]; i++) 526 printf(" %s", args[i]); 527 bb_putchar('\n'); 528 } 529 530 /* Fork and execute the correct program. */ 531 pid = -1; 532 if (!noexecute) { 533 pid = spawn(args); 534 if (pid < 0) 535 bb_simple_perror_msg(args[0]); 536 } 537 538#if DO_PROGRESS_INDICATOR 539 free(args[XXX]); 540#endif 541 542 /* No child, so don't record an instance */ 543 if (pid <= 0) { 544 free(args[0]); 545 return; 546 } 547 548 inst = xzalloc(sizeof(*inst)); 549 inst->pid = pid; 550 inst->prog = args[0]; 551 inst->device = xstrdup(device); 552 inst->base_device = base_device(device); 553#if DO_PROGRESS_INDICATOR 554 inst->start_time = time(NULL); 555#endif 556 557 /* Add to the list of running fsck's. 558 * (was adding to the end, but adding to the front is simpler...) */ 559 inst->next = instance_list; 560 instance_list = inst; 561} 562 563/* 564 * Run the fsck program on a particular device 565 * 566 * If the type is specified using -t, and it isn't prefixed with "no" 567 * (as in "noext2") and only one filesystem type is specified, then 568 * use that type regardless of what is specified in /etc/fstab. 569 * 570 * If the type isn't specified by the user, then use either the type 571 * specified in /etc/fstab, or "auto". 572 */ 573static void fsck_device(struct fs_info *fs /*, int interactive */) 574{ 575 const char *type; 576 577 if (strcmp(fs->type, "auto") != 0) { 578 type = fs->type; 579 if (verbose > 2) 580 bb_info_msg("using filesystem type '%s' %s", 581 type, "from fstab"); 582 } else if (fstype 583 && (fstype[0] != 'n' || fstype[1] != 'o') /* != "no" */ 584 && strncmp(fstype, "opts=", 5) != 0 585 && strncmp(fstype, "loop", 4) != 0 586 && !strchr(fstype, ',') 587 ) { 588 type = fstype; 589 if (verbose > 2) 590 bb_info_msg("using filesystem type '%s' %s", 591 type, "from -t"); 592 } else { 593 type = "auto"; 594 if (verbose > 2) 595 bb_info_msg("using filesystem type '%s' %s", 596 type, "(default)"); 597 } 598 599 num_running++; 600 execute(type, fs->device, fs->mountpt /*, interactive */); 601} 602 603/* 604 * Returns TRUE if a partition on the same disk is already being 605 * checked. 606 */ 607static int device_already_active(char *device) 608{ 609 struct fsck_instance *inst; 610 char *base; 611 612 if (force_all_parallel) 613 return 0; 614 615#ifdef BASE_MD 616 /* Don't check a soft raid disk with any other disk */ 617 if (instance_list 618 && (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) 619 || !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)) 620 ) { 621 return 1; 622 } 623#endif 624 625 base = base_device(device); 626 /* 627 * If we don't know the base device, assume that the device is 628 * already active if there are any fsck instances running. 629 */ 630 if (!base) 631 return (instance_list != NULL); 632 633 for (inst = instance_list; inst; inst = inst->next) { 634 if (!inst->base_device || !strcmp(base, inst->base_device)) { 635 free(base); 636 return 1; 637 } 638 } 639 640 free(base); 641 return 0; 642} 643 644/* 645 * This function returns true if a particular option appears in a 646 * comma-delimited options list 647 */ 648static int opt_in_list(char *opt, char *optlist) 649{ 650 char *s; 651 int len; 652 653 if (!optlist) 654 return 0; 655 656 len = strlen(opt); 657 s = optlist - 1; 658 while (1) { 659 s = strstr(s + 1, opt); 660 if (!s) 661 return 0; 662 /* neither "opt.." nor "xxx,opt.."? */ 663 if (s != optlist && s[-1] != ',') 664 continue; 665 /* neither "..opt" nor "..opt,xxx"? */ 666 if (s[len] != '\0' && s[len] != ',') 667 continue; 668 return 1; 669 } 670} 671 672/* See if the filesystem matches the criteria given by the -t option */ 673static int fs_match(struct fs_info *fs) 674{ 675 int n, ret, checked_type; 676 char *cp; 677 678 if (!fs_type_list) 679 return 1; 680 681 ret = 0; 682 checked_type = 0; 683 n = 0; 684 while (1) { 685 cp = fs_type_list[n]; 686 if (!cp) 687 break; 688 switch (fs_type_flag[n]) { 689 case FS_TYPE_FLAG_NORMAL: 690 checked_type++; 691 if (strcmp(cp, fs->type) == 0) 692 ret = 1; 693 break; 694 case FS_TYPE_FLAG_NEGOPT: 695 if (opt_in_list(cp, fs->opts)) 696 return 0; 697 break; 698 case FS_TYPE_FLAG_OPT: 699 if (!opt_in_list(cp, fs->opts)) 700 return 0; 701 break; 702 } 703 n++; 704 } 705 if (checked_type == 0) 706 return 1; 707 708 return (fs_type_negated ? !ret : ret); 709} 710 711/* Check if we should ignore this filesystem. */ 712static int ignore(struct fs_info *fs) 713{ 714 /* 715 * If the pass number is 0, ignore it. 716 */ 717 if (fs->passno == 0) 718 return 1; 719 720 /* 721 * If a specific fstype is specified, and it doesn't match, 722 * ignore it. 723 */ 724 if (!fs_match(fs)) 725 return 1; 726 727 /* Are we ignoring this type? */ 728 if (index_in_strings(ignored_types, fs->type) >= 0) 729 return 1; 730 731 /* We can and want to check this file system type. */ 732 return 0; 733} 734 735/* Check all file systems, using the /etc/fstab table. */ 736static int check_all(void) 737{ 738 struct fs_info *fs; 739 int status = EXIT_OK; 740 smallint not_done_yet; 741 smallint pass_done; 742 int passno; 743 744 if (verbose) 745 puts("Checking all filesystems"); 746 747 /* 748 * Do an initial scan over the filesystem; mark filesystems 749 * which should be ignored as done, and resolve any "auto" 750 * filesystem types (done as a side-effect of calling ignore()). 751 */ 752 for (fs = filesys_info; fs; fs = fs->next) 753 if (ignore(fs)) 754 fs->flags |= FLAG_DONE; 755 756 /* 757 * Find and check the root filesystem. 758 */ 759 if (!parallel_root) { 760 for (fs = filesys_info; fs; fs = fs->next) { 761 if (LONE_CHAR(fs->mountpt, '/')) { 762 if (!skip_root && !ignore(fs)) { 763 fsck_device(fs /*, 1*/); 764 status |= wait_many(FLAG_WAIT_ALL); 765 if (status > EXIT_NONDESTRUCT) 766 return status; 767 } 768 fs->flags |= FLAG_DONE; 769 break; 770 } 771 } 772 } 773 /* 774 * This is for the bone-headed user who has root 775 * filesystem listed twice. 776 * "Skip root" will skip _all_ root entries. 777 */ 778 if (skip_root) 779 for (fs = filesys_info; fs; fs = fs->next) 780 if (LONE_CHAR(fs->mountpt, '/')) 781 fs->flags |= FLAG_DONE; 782 783 not_done_yet = 1; 784 passno = 1; 785 while (not_done_yet) { 786 not_done_yet = 0; 787 pass_done = 1; 788 789 for (fs = filesys_info; fs; fs = fs->next) { 790 if (bb_got_signal) 791 break; 792 if (fs->flags & FLAG_DONE) 793 continue; 794 /* 795 * If the filesystem's pass number is higher 796 * than the current pass number, then we didn't 797 * do it yet. 798 */ 799 if (fs->passno > passno) { 800 not_done_yet = 1; 801 continue; 802 } 803 /* 804 * If a filesystem on a particular device has 805 * already been spawned, then we need to defer 806 * this to another pass. 807 */ 808 if (device_already_active(fs->device)) { 809 pass_done = 0; 810 continue; 811 } 812 /* 813 * Spawn off the fsck process 814 */ 815 fsck_device(fs /*, serialize*/); 816 fs->flags |= FLAG_DONE; 817 818 /* 819 * Only do one filesystem at a time, or if we 820 * have a limit on the number of fsck's extant 821 * at one time, apply that limit. 822 */ 823 if (serialize 824 || (max_running && (num_running >= max_running)) 825 ) { 826 pass_done = 0; 827 break; 828 } 829 } 830 if (bb_got_signal) 831 break; 832 if (verbose > 1) 833 printf("--waiting-- (pass %d)\n", passno); 834 status |= wait_many(pass_done ? FLAG_WAIT_ALL : 835 FLAG_WAIT_ATLEAST_ONE); 836 if (pass_done) { 837 if (verbose > 1) 838 puts("----------------------------------"); 839 passno++; 840 } else 841 not_done_yet = 1; 842 } 843 kill_all_if_got_signal(); 844 status |= wait_many(FLAG_WAIT_ATLEAST_ONE); 845 return status; 846} 847 848/* 849 * Deal with the fsck -t argument. 850 * Huh, for mount "-t novfat,nfs" means "neither vfat nor nfs"! 851 * Why here we require "-t novfat,nonfs" ?? 852 */ 853static void compile_fs_type(char *fs_type) 854{ 855 char *s; 856 int num = 2; 857 smallint negate; 858 859 s = fs_type; 860 while ((s = strchr(s, ','))) { 861 num++; 862 s++; 863 } 864 865 fs_type_list = xzalloc(num * sizeof(fs_type_list[0])); 866 fs_type_flag = xzalloc(num * sizeof(fs_type_flag[0])); 867 fs_type_negated = -1; /* not yet known is it negated or not */ 868 869 num = 0; 870 s = fs_type; 871 while (1) { 872 char *comma; 873 874 negate = 0; 875 if (s[0] == 'n' && s[1] == 'o') { /* "no.." */ 876 s += 2; 877 negate = 1; 878 } else if (s[0] == '!') { 879 s++; 880 negate = 1; 881 } 882 883 if (strcmp(s, "loop") == 0) 884 /* loop is really short-hand for opts=loop */ 885 goto loop_special_case; 886 if (strncmp(s, "opts=", 5) == 0) { 887 s += 5; 888 loop_special_case: 889 fs_type_flag[num] = negate ? FS_TYPE_FLAG_NEGOPT : FS_TYPE_FLAG_OPT; 890 } else { 891 if (fs_type_negated == -1) 892 fs_type_negated = negate; 893 if (fs_type_negated != negate) 894 bb_error_msg_and_die( 895"either all or none of the filesystem types passed to -t must be prefixed " 896"with 'no' or '!'"); 897 } 898 comma = strchr(s, ','); 899 fs_type_list[num++] = comma ? xstrndup(s, comma-s) : xstrdup(s); 900 if (!comma) 901 break; 902 s = comma + 1; 903 } 904} 905 906static char **new_args(void) 907{ 908 args = xrealloc_vector(args, 2, num_args); 909 return &args[num_args++]; 910} 911 912int fsck_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 913int fsck_main(int argc UNUSED_PARAM, char **argv) 914{ 915 int i, status; 916 /*int interactive;*/ 917 struct fs_info *fs; 918 const char *fstab; 919 char *tmp; 920 char **devices; 921 int num_devices; 922 smallint opts_for_fsck; 923 smallint doall; 924 smallint notitle; 925 926 /* we want wait() to be interruptible */ 927 signal_no_SA_RESTART_empty_mask(SIGINT, record_signo); 928 signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo); 929 930 setbuf(stdout, NULL); 931 932 opts_for_fsck = doall = notitle = 0; 933 devices = NULL; 934 num_devices = 0; 935 new_args(); /* args[0] = NULL, will be replaced by fsck.<type> */ 936 /* instance_list = NULL; - in bss, so already zeroed */ 937 938 while (*++argv) { 939 int j; 940 int optpos; 941 char *options; 942 char *arg = *argv; 943 944 /* "/dev/blk" or "/path" or "UUID=xxx" or "LABEL=xxx" */ 945 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) { 946// FIXME: must check that arg is a blkdev, or resolve 947// "/path", "UUID=xxx" or "LABEL=xxx" into block device name 948// ("UUID=xxx"/"LABEL=xxx" can probably shifted to fsck.auto duties) 949 devices = xrealloc_vector(devices, 2, num_devices); 950 devices[num_devices++] = arg; 951 continue; 952 } 953 954 if (arg[0] != '-' || opts_for_fsck) { 955 *new_args() = arg; 956 continue; 957 } 958 959 if (LONE_CHAR(arg + 1, '-')) { /* "--" ? */ 960 opts_for_fsck = 1; 961 continue; 962 } 963 964 optpos = 0; 965 options = NULL; 966 for (j = 1; arg[j]; j++) { 967 switch (arg[j]) { 968 case 'A': 969 doall = 1; 970 break; 971#if DO_PROGRESS_INDICATOR 972 case 'C': 973 progress = 1; 974 if (arg[++j]) { /* -Cn */ 975 progress_fd = xatoi_u(&arg[j]); 976 goto next_arg; 977 } 978 /* -C n */ 979 if (!*++argv) 980 bb_show_usage(); 981 progress_fd = xatoi_u(*argv); 982 goto next_arg; 983#endif 984 case 'V': 985 verbose++; 986 break; 987 case 'N': 988 noexecute = 1; 989 break; 990 case 'R': 991 skip_root = 1; 992 break; 993 case 'T': 994 notitle = 1; 995 break; 996/* case 'M': 997 like_mount = 1; 998 break; */ 999 case 'P': 1000 parallel_root = 1; 1001 break; 1002 case 's': 1003 serialize = 1; 1004 break; 1005 case 't': 1006 if (fstype) 1007 bb_show_usage(); 1008 if (arg[++j]) 1009 tmp = &arg[j]; 1010 else if (*++argv) 1011 tmp = *argv; 1012 else 1013 bb_show_usage(); 1014 fstype = xstrdup(tmp); 1015 compile_fs_type(fstype); 1016 goto next_arg; 1017 case '?': 1018 bb_show_usage(); 1019 break; 1020 default: 1021 optpos++; 1022 /* one extra for '\0' */ 1023 options = xrealloc(options, optpos + 2); 1024 options[optpos] = arg[j]; 1025 break; 1026 } 1027 } 1028 next_arg: 1029 if (optpos) { 1030 options[0] = '-'; 1031 options[optpos + 1] = '\0'; 1032 *new_args() = options; 1033 } 1034 } 1035 if (getenv("FSCK_FORCE_ALL_PARALLEL")) 1036 force_all_parallel = 1; 1037 tmp = getenv("FSCK_MAX_INST"); 1038 if (tmp) 1039 max_running = xatoi(tmp); 1040 new_args(); /* args[num_args - 2] will be replaced by <device> */ 1041 new_args(); /* args[num_args - 1] is the last, NULL element */ 1042 1043 if (!notitle) 1044 puts("fsck (busybox "BB_VER", "BB_BT")"); 1045 1046 /* Even plain "fsck /dev/hda1" needs fstab to get fs type, 1047 * so we are scanning it anyway */ 1048 fstab = getenv("FSTAB_FILE"); 1049 if (!fstab) 1050 fstab = "/etc/fstab"; 1051 load_fs_info(fstab); 1052 1053 /*interactive = (num_devices == 1) | serialize;*/ 1054 1055 if (num_devices == 0) 1056 /*interactive =*/ serialize = doall = 1; 1057 if (doall) 1058 return check_all(); 1059 1060 status = 0; 1061 for (i = 0; i < num_devices; i++) { 1062 if (bb_got_signal) { 1063 kill_all_if_got_signal(); 1064 break; 1065 } 1066 1067 fs = lookup(devices[i]); 1068 if (!fs) 1069 fs = create_fs_device(devices[i], "", "auto", NULL, -1); 1070 fsck_device(fs /*, interactive */); 1071 1072 if (serialize 1073 || (max_running && (num_running >= max_running)) 1074 ) { 1075 int exit_status = wait_one(0); 1076 if (exit_status >= 0) 1077 status |= exit_status; 1078 if (verbose > 1) 1079 puts("----------------------------------"); 1080 } 1081 } 1082 status |= wait_many(FLAG_WAIT_ALL); 1083 return status; 1084} 1085