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 tarball for details. 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 67struct 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 */ 84struct 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 */ 115static const char *const devfs_hier[] = { 116 "host", "bus", "target", "lun", 0 117}; 118#endif 119 120static 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 220errout: 221 free(str); 222 return NULL; 223} 224 225 226static 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 238static 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 */ 254static char *devices[MAX_DEVICES]; 255static char *args[MAX_ARGS]; 256static int num_devices, num_args; 257 258static int verbose; 259static int doall; 260static int noexecute; 261static int serialize; 262static int skip_root; 263static int like_mount; 264static int notitle; 265static int parallel_root; 266static int progress; 267static int progress_fd; 268static int force_all_parallel; 269static int num_running; 270static int max_running; 271static volatile int cancel_requested; 272static int kill_sent; 273static char *fstype; 274static struct fs_info *filesys_info, *filesys_last; 275static struct fsck_instance *instance_list; 276static char *fsck_path; 277static blkid_cache cache; 278 279static 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 289static 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 301static char *skip_over_blank(char *cp) 302{ 303 while (*cp && isspace(*cp)) 304 cp++; 305 return cp; 306} 307 308static char *skip_over_word(char *cp) 309{ 310 while (*cp && !isspace(*cp)) 311 cp++; 312 return cp; 313} 314 315static 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 328static 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 344static void parse_escape(char *word) 345{ 346 char *q, c; 347 const char *p; 348 349 if (!word) 350 return; 351 352 for (p = q = word; *p; q++) { 353 c = *p++; 354 if (c != '\\') { 355 *q = c; 356 } else { 357 *q = bb_process_escape_sequence(&p); 358 } 359 } 360 *q = 0; 361} 362 363static void free_instance(struct fsck_instance *i) 364{ 365 if (i->prog) 366 free(i->prog); 367 if (i->device) 368 free(i->device); 369 if (i->base_device) 370 free(i->base_device); 371 free(i); 372} 373 374static struct fs_info *create_fs_device(const char *device, const char *mntpnt, 375 const char *type, const char *opts, 376 int freq, int passno) 377{ 378 struct fs_info *fs; 379 380 fs = xmalloc(sizeof(struct fs_info)); 381 382 fs->device = string_copy(device); 383 fs->mountpt = string_copy(mntpnt); 384 fs->type = string_copy(type); 385 fs->opts = string_copy(opts ? opts : ""); 386 fs->freq = freq; 387 fs->passno = passno; 388 fs->flags = 0; 389 fs->next = NULL; 390 391 if (!filesys_info) 392 filesys_info = fs; 393 else 394 filesys_last->next = fs; 395 filesys_last = fs; 396 397 return fs; 398} 399 400 401 402static int parse_fstab_line(char *line, struct fs_info **ret_fs) 403{ 404 char *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp; 405 struct fs_info *fs; 406 407 *ret_fs = 0; 408 strip_line(line); 409 if ((cp = strchr(line, '#'))) 410 *cp = 0; /* Ignore everything after the comment char */ 411 cp = line; 412 413 device = parse_word(&cp); 414 mntpnt = parse_word(&cp); 415 type = parse_word(&cp); 416 opts = parse_word(&cp); 417 freq = parse_word(&cp); 418 passno = parse_word(&cp); 419 420 if (!device) 421 return 0; /* Allow blank lines */ 422 423 if (!mntpnt || !type) 424 return -1; 425 426 parse_escape(device); 427 parse_escape(mntpnt); 428 parse_escape(type); 429 parse_escape(opts); 430 parse_escape(freq); 431 parse_escape(passno); 432 433 dev = blkid_get_devname(cache, device, NULL); 434 if (dev) 435 device = dev; 436 437 if (strchr(type, ',')) 438 type = 0; 439 440 fs = create_fs_device(device, mntpnt, type ? type : "auto", opts, 441 freq ? atoi(freq) : -1, 442 passno ? atoi(passno) : -1); 443 if (dev) 444 free(dev); 445 446 if (!fs) 447 return -1; 448 *ret_fs = fs; 449 return 0; 450} 451 452static void interpret_type(struct fs_info *fs) 453{ 454 char *t; 455 456 if (strcmp(fs->type, "auto") != 0) 457 return; 458 t = blkid_get_tag_value(cache, "TYPE", fs->device); 459 if (t) { 460 free(fs->type); 461 fs->type = t; 462 } 463} 464 465/* 466 * Load the filesystem database from /etc/fstab 467 */ 468static void load_fs_info(const char *filename) 469{ 470 FILE *f; 471 char buf[1024]; 472 int lineno = 0; 473 int old_fstab = 1; 474 struct fs_info *fs; 475 476 if ((f = fopen_or_warn(filename, "r")) == NULL) { 477 return; 478 } 479 while (!feof(f)) { 480 lineno++; 481 if (!fgets(buf, sizeof(buf), f)) 482 break; 483 buf[sizeof(buf)-1] = 0; 484 if (parse_fstab_line(buf, &fs) < 0) { 485 bb_error_msg("WARNING: bad format " 486 "on line %d of %s\n", lineno, filename); 487 continue; 488 } 489 if (!fs) 490 continue; 491 if (fs->passno < 0) 492 fs->passno = 0; 493 else 494 old_fstab = 0; 495 } 496 497 fclose(f); 498 499 if (old_fstab) { 500 fputs("\007\007\007" 501 "WARNING: Your /etc/fstab does not contain the fsck passno\n" 502 " field. I will kludge around things for you, but you\n" 503 " should fix your /etc/fstab file as soon as you can.\n\n", stderr); 504 505 for (fs = filesys_info; fs; fs = fs->next) { 506 fs->passno = 1; 507 } 508 } 509} 510 511/* Lookup filesys in /etc/fstab and return the corresponding entry. */ 512static struct fs_info *lookup(char *filesys) 513{ 514 struct fs_info *fs; 515 516 /* No filesys name given. */ 517 if (filesys == NULL) 518 return NULL; 519 520 for (fs = filesys_info; fs; fs = fs->next) { 521 if (!strcmp(filesys, fs->device) || 522 (fs->mountpt && !strcmp(filesys, fs->mountpt))) 523 break; 524 } 525 526 return fs; 527} 528 529/* Find fsck program for a given fs type. */ 530static char *find_fsck(char *type) 531{ 532 char *s; 533 const char *tpl; 534 char *p = string_copy(fsck_path); 535 struct stat st; 536 537 /* Are we looking for a program or just a type? */ 538 tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s"); 539 540 for (s = strtok(p, ":"); s; s = strtok(NULL, ":")) { 541 s = xasprintf(tpl, s, type); 542 if (stat(s, &st) == 0) break; 543 free(s); 544 } 545 free(p); 546 return s; 547} 548 549static int progress_active(void) 550{ 551 struct fsck_instance *inst; 552 553 for (inst = instance_list; inst; inst = inst->next) { 554 if (inst->flags & FLAG_DONE) 555 continue; 556 if (inst->flags & FLAG_PROGRESS) 557 return 1; 558 } 559 return 0; 560} 561 562/* 563 * Execute a particular fsck program, and link it into the list of 564 * child processes we are waiting for. 565 */ 566static int execute(const char *type, const char *device, const char *mntpt, 567 int interactive) 568{ 569 char *s, *argv[80]; 570 char *prog; 571 int argc, i; 572 struct fsck_instance *inst, *p; 573 pid_t pid; 574 575 inst = xzalloc(sizeof(struct fsck_instance)); 576 577 prog = xasprintf("fsck.%s", type); 578 argv[0] = prog; 579 argc = 1; 580 581 for (i=0; i <num_args; i++) 582 argv[argc++] = string_copy(args[i]); 583 584 if (progress && !progress_active()) { 585 if ((strcmp(type, "ext2") == 0) || 586 (strcmp(type, "ext3") == 0)) { 587 char tmp[80]; 588 snprintf(tmp, 80, "-C%d", progress_fd); 589 argv[argc++] = string_copy(tmp); 590 inst->flags |= FLAG_PROGRESS; 591 } 592 } 593 594 argv[argc++] = string_copy(device); 595 argv[argc] = 0; 596 597 s = find_fsck(prog); 598 if (s == NULL) { 599 bb_error_msg("%s: not found", prog); 600 return ENOENT; 601 } 602 603 if (verbose || noexecute) { 604 printf("[%s (%d) -- %s] ", s, num_running, 605 mntpt ? mntpt : device); 606 for (i=0; i < argc; i++) 607 printf("%s ", argv[i]); 608 bb_putchar('\n'); 609 } 610 611 /* Fork and execute the correct program. */ 612 if (noexecute) 613 pid = -1; 614 else if ((pid = fork()) < 0) { 615 perror("vfork"+1); 616 return errno; 617 } else if (pid == 0) { 618 if (!interactive) 619 close(0); 620 (void) execv(s, argv); 621 bb_simple_perror_msg_and_die(argv[0]); 622 } 623 624 for (i = 1; i < argc; i++) 625 free(argv[i]); 626 627 free(s); 628 inst->pid = pid; 629 inst->prog = prog; 630 inst->type = string_copy(type); 631 inst->device = string_copy(device); 632 inst->base_device = base_device(device); 633 inst->start_time = time(0); 634 inst->next = NULL; 635 636 /* 637 * Find the end of the list, so we add the instance on at the end. 638 */ 639 for (p = instance_list; p && p->next; p = p->next); 640 641 if (p) 642 p->next = inst; 643 else 644 instance_list = inst; 645 646 return 0; 647} 648 649/* 650 * Send a signal to all outstanding fsck child processes 651 */ 652static int kill_all(int signum) 653{ 654 struct fsck_instance *inst; 655 int n = 0; 656 657 for (inst = instance_list; inst; inst = inst->next) { 658 if (inst->flags & FLAG_DONE) 659 continue; 660 kill(inst->pid, signum); 661 n++; 662 } 663 return n; 664} 665 666/* 667 * Wait for one child process to exit; when it does, unlink it from 668 * the list of executing child processes, and return it. 669 */ 670static struct fsck_instance *wait_one(int flags) 671{ 672 int status; 673 int sig; 674 struct fsck_instance *inst, *inst2, *prev; 675 pid_t pid; 676 677 if (!instance_list) 678 return NULL; 679 680 if (noexecute) { 681 inst = instance_list; 682 prev = 0; 683#ifdef RANDOM_DEBUG 684 while (inst->next && (random() & 1)) { 685 prev = inst; 686 inst = inst->next; 687 } 688#endif 689 inst->exit_status = 0; 690 goto ret_inst; 691 } 692 693 /* 694 * gcc -Wall fails saving throw against stupidity 695 * (inst and prev are thought to be uninitialized variables) 696 */ 697 inst = prev = NULL; 698 699 do { 700 pid = waitpid(-1, &status, flags); 701 if (cancel_requested && !kill_sent) { 702 kill_all(SIGTERM); 703 kill_sent++; 704 } 705 if ((pid == 0) && (flags & WNOHANG)) 706 return NULL; 707 if (pid < 0) { 708 if ((errno == EINTR) || (errno == EAGAIN)) 709 continue; 710 if (errno == ECHILD) { 711 bb_error_msg("wait: no more child process?!?"); 712 return NULL; 713 } 714 perror("wait"); 715 continue; 716 } 717 for (prev = 0, inst = instance_list; 718 inst; 719 prev = inst, inst = inst->next) { 720 if (inst->pid == pid) 721 break; 722 } 723 } while (!inst); 724 725 if (WIFEXITED(status)) 726 status = WEXITSTATUS(status); 727 else if (WIFSIGNALED(status)) { 728 sig = WTERMSIG(status); 729 if (sig == SIGINT) { 730 status = EXIT_UNCORRECTED; 731 } else { 732 printf("Warning... %s for device %s exited " 733 "with signal %d.\n", 734 inst->prog, inst->device, sig); 735 status = EXIT_ERROR; 736 } 737 } else { 738 printf("%s %s: status is %x, should never happen.\n", 739 inst->prog, inst->device, status); 740 status = EXIT_ERROR; 741 } 742 inst->exit_status = status; 743 if (progress && (inst->flags & FLAG_PROGRESS) && 744 !progress_active()) { 745 for (inst2 = instance_list; inst2; inst2 = inst2->next) { 746 if (inst2->flags & FLAG_DONE) 747 continue; 748 if (strcmp(inst2->type, "ext2") && 749 strcmp(inst2->type, "ext3")) 750 continue; 751 /* 752 * If we've just started the fsck, wait a tiny 753 * bit before sending the kill, to give it 754 * time to set up the signal handler 755 */ 756 if (inst2->start_time < time(0)+2) { 757 if (fork() == 0) { 758 sleep(1); 759 kill(inst2->pid, SIGUSR1); 760 exit(0); 761 } 762 } else 763 kill(inst2->pid, SIGUSR1); 764 inst2->flags |= FLAG_PROGRESS; 765 break; 766 } 767 } 768ret_inst: 769 if (prev) 770 prev->next = inst->next; 771 else 772 instance_list = inst->next; 773 if (verbose > 1) 774 printf("Finished with %s (exit status %d)\n", 775 inst->device, inst->exit_status); 776 num_running--; 777 return inst; 778} 779 780#define FLAG_WAIT_ALL 0 781#define FLAG_WAIT_ATLEAST_ONE 1 782/* 783 * Wait until all executing child processes have exited; return the 784 * logical OR of all of their exit code values. 785 */ 786static int wait_many(int flags) 787{ 788 struct fsck_instance *inst; 789 int global_status = 0; 790 int wait_flags = 0; 791 792 while ((inst = wait_one(wait_flags))) { 793 global_status |= inst->exit_status; 794 free_instance(inst); 795#ifdef RANDOM_DEBUG 796 if (noexecute && (flags & WNOHANG) && !(random() % 3)) 797 break; 798#endif 799 if (flags & FLAG_WAIT_ATLEAST_ONE) 800 wait_flags = WNOHANG; 801 } 802 return global_status; 803} 804 805/* 806 * Run the fsck program on a particular device 807 * 808 * If the type is specified using -t, and it isn't prefixed with "no" 809 * (as in "noext2") and only one filesystem type is specified, then 810 * use that type regardless of what is specified in /etc/fstab. 811 * 812 * If the type isn't specified by the user, then use either the type 813 * specified in /etc/fstab, or DEFAULT_FSTYPE. 814 */ 815static void fsck_device(struct fs_info *fs, int interactive) 816{ 817 const char *type; 818 int retval; 819 820 interpret_type(fs); 821 822 if (strcmp(fs->type, "auto") != 0) 823 type = fs->type; 824 else if (fstype && strncmp(fstype, "no", 2) && 825 strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) && 826 !strchr(fstype, ',')) 827 type = fstype; 828 else 829 type = DEFAULT_FSTYPE; 830 831 num_running++; 832 retval = execute(type, fs->device, fs->mountpt, interactive); 833 if (retval) { 834 bb_error_msg("error %d while executing fsck.%s for %s", 835 retval, type, fs->device); 836 num_running--; 837 } 838} 839 840 841/* 842 * Deal with the fsck -t argument. 843 */ 844struct fs_type_compile { 845 char **list; 846 int *type; 847 int negate; 848} fs_type_compiled; 849 850#define FS_TYPE_NORMAL 0 851#define FS_TYPE_OPT 1 852#define FS_TYPE_NEGOPT 2 853 854static const char fs_type_syntax_error[] = 855"Either all or none of the filesystem types passed to -t must be prefixed\n" 856 "with 'no' or '!'."; 857 858static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp) 859{ 860 char *cp, *list, *s; 861 int num = 2; 862 int negate, first_negate = 1; 863 864 if (fs_type) { 865 for (cp=fs_type; *cp; cp++) { 866 if (*cp == ',') 867 num++; 868 } 869 } 870 871 cmp->list = xzalloc(num * sizeof(char *)); 872 cmp->type = xzalloc(num * sizeof(int)); 873 cmp->negate = 0; 874 875 if (!fs_type) 876 return; 877 878 list = string_copy(fs_type); 879 num = 0; 880 s = strtok(list, ","); 881 while (s) { 882 negate = 0; 883 if (strncmp(s, "no", 2) == 0) { 884 s += 2; 885 negate = 1; 886 } else if (*s == '!') { 887 s++; 888 negate = 1; 889 } 890 if (strcmp(s, "loop") == 0) 891 /* loop is really short-hand for opts=loop */ 892 goto loop_special_case; 893 else if (strncmp(s, "opts=", 5) == 0) { 894 s += 5; 895 loop_special_case: 896 cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT; 897 } else { 898 if (first_negate) { 899 cmp->negate = negate; 900 first_negate = 0; 901 } 902 if ((negate && !cmp->negate) || 903 (!negate && cmp->negate)) { 904 bb_error_msg_and_die("%s", fs_type_syntax_error); 905 } 906 } 907 cmp->list[num++] = string_copy(s); 908 s = strtok(NULL, ","); 909 } 910 free(list); 911} 912 913/* 914 * This function returns true if a particular option appears in a 915 * comma-delimited options list 916 */ 917static int opt_in_list(char *opt, char *optlist) 918{ 919 char *list, *s; 920 921 if (!optlist) 922 return 0; 923 list = string_copy(optlist); 924 925 s = strtok(list, ","); 926 while (s) { 927 if (strcmp(s, opt) == 0) { 928 free(list); 929 return 1; 930 } 931 s = strtok(NULL, ","); 932 } 933 free(list); 934 return 0; 935} 936 937/* See if the filesystem matches the criteria given by the -t option */ 938static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp) 939{ 940 int n, ret = 0, checked_type = 0; 941 char *cp; 942 943 if (cmp->list == 0 || cmp->list[0] == 0) 944 return 1; 945 946 for (n=0; (cp = cmp->list[n]); n++) { 947 switch (cmp->type[n]) { 948 case FS_TYPE_NORMAL: 949 checked_type++; 950 if (strcmp(cp, fs->type) == 0) { 951 ret = 1; 952 } 953 break; 954 case FS_TYPE_NEGOPT: 955 if (opt_in_list(cp, fs->opts)) 956 return 0; 957 break; 958 case FS_TYPE_OPT: 959 if (!opt_in_list(cp, fs->opts)) 960 return 0; 961 break; 962 } 963 } 964 if (checked_type == 0) 965 return 1; 966 return (cmp->negate ? !ret : ret); 967} 968 969/* Check if we should ignore this filesystem. */ 970static int ignore(struct fs_info *fs) 971{ 972 int wanted; 973 char *s; 974 975 /* 976 * If the pass number is 0, ignore it. 977 */ 978 if (fs->passno == 0) 979 return 1; 980 981 interpret_type(fs); 982 983 /* 984 * If a specific fstype is specified, and it doesn't match, 985 * ignore it. 986 */ 987 if (!fs_match(fs, &fs_type_compiled)) return 1; 988 989 /* Are we ignoring this type? */ 990 if (index_in_str_array(ignored_types, fs->type) >= 0) 991 return 1; 992 993 /* Do we really really want to check this fs? */ 994 wanted = index_in_str_array(really_wanted, fs->type) >= 0; 995 996 /* See if the <fsck.fs> program is available. */ 997 s = find_fsck(fs->type); 998 if (s == NULL) { 999 if (wanted) 1000 bb_error_msg("can't check %s: fsck.%s not found", 1001 fs->device, fs->type); 1002 return 1; 1003 } 1004 free(s); 1005 1006 /* We can and want to check this file system type. */ 1007 return 0; 1008} 1009 1010/* 1011 * Returns TRUE if a partition on the same disk is already being 1012 * checked. 1013 */ 1014static int device_already_active(char *device) 1015{ 1016 struct fsck_instance *inst; 1017 char *base; 1018 1019 if (force_all_parallel) 1020 return 0; 1021 1022#ifdef BASE_MD 1023 /* Don't check a soft raid disk with any other disk */ 1024 if (instance_list && 1025 (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) || 1026 !strncmp(device, BASE_MD, sizeof(BASE_MD)-1))) 1027 return 1; 1028#endif 1029 1030 base = base_device(device); 1031 /* 1032 * If we don't know the base device, assume that the device is 1033 * already active if there are any fsck instances running. 1034 */ 1035 if (!base) 1036 return (instance_list != 0); 1037 for (inst = instance_list; inst; inst = inst->next) { 1038 if (!inst->base_device || !strcmp(base, inst->base_device)) { 1039 free(base); 1040 return 1; 1041 } 1042 } 1043 free(base); 1044 return 0; 1045} 1046 1047/* Check all file systems, using the /etc/fstab table. */ 1048static int check_all(void) 1049{ 1050 struct fs_info *fs = NULL; 1051 int status = EXIT_OK; 1052 int not_done_yet = 1; 1053 int passno = 1; 1054 int pass_done; 1055 1056 if (verbose) 1057 fputs("Checking all file systems.\n", stdout); 1058 1059 /* 1060 * Do an initial scan over the filesystem; mark filesystems 1061 * which should be ignored as done, and resolve any "auto" 1062 * filesystem types (done as a side-effect of calling ignore()). 1063 */ 1064 for (fs = filesys_info; fs; fs = fs->next) { 1065 if (ignore(fs)) 1066 fs->flags |= FLAG_DONE; 1067 } 1068 1069 /* 1070 * Find and check the root filesystem. 1071 */ 1072 if (!parallel_root) { 1073 for (fs = filesys_info; fs; fs = fs->next) { 1074 if (LONE_CHAR(fs->mountpt, '/')) 1075 break; 1076 } 1077 if (fs) { 1078 if (!skip_root && !ignore(fs)) { 1079 fsck_device(fs, 1); 1080 status |= wait_many(FLAG_WAIT_ALL); 1081 if (status > EXIT_NONDESTRUCT) 1082 return status; 1083 } 1084 fs->flags |= FLAG_DONE; 1085 } 1086 } 1087 /* 1088 * This is for the bone-headed user who enters the root 1089 * filesystem twice. Skip root will skep all root entries. 1090 */ 1091 if (skip_root) 1092 for (fs = filesys_info; fs; fs = fs->next) 1093 if (LONE_CHAR(fs->mountpt, '/')) 1094 fs->flags |= FLAG_DONE; 1095 1096 while (not_done_yet) { 1097 not_done_yet = 0; 1098 pass_done = 1; 1099 1100 for (fs = filesys_info; fs; fs = fs->next) { 1101 if (cancel_requested) 1102 break; 1103 if (fs->flags & FLAG_DONE) 1104 continue; 1105 /* 1106 * If the filesystem's pass number is higher 1107 * than the current pass number, then we don't 1108 * do it yet. 1109 */ 1110 if (fs->passno > passno) { 1111 not_done_yet++; 1112 continue; 1113 } 1114 /* 1115 * If a filesystem on a particular device has 1116 * already been spawned, then we need to defer 1117 * this to another pass. 1118 */ 1119 if (device_already_active(fs->device)) { 1120 pass_done = 0; 1121 continue; 1122 } 1123 /* 1124 * Spawn off the fsck process 1125 */ 1126 fsck_device(fs, serialize); 1127 fs->flags |= FLAG_DONE; 1128 1129 /* 1130 * Only do one filesystem at a time, or if we 1131 * have a limit on the number of fsck's extant 1132 * at one time, apply that limit. 1133 */ 1134 if (serialize || 1135 (max_running && (num_running >= max_running))) { 1136 pass_done = 0; 1137 break; 1138 } 1139 } 1140 if (cancel_requested) 1141 break; 1142 if (verbose > 1) 1143 printf("--waiting-- (pass %d)\n", passno); 1144 status |= wait_many(pass_done ? FLAG_WAIT_ALL : 1145 FLAG_WAIT_ATLEAST_ONE); 1146 if (pass_done) { 1147 if (verbose > 1) 1148 printf("----------------------------------\n"); 1149 passno++; 1150 } else 1151 not_done_yet++; 1152 } 1153 if (cancel_requested && !kill_sent) { 1154 kill_all(SIGTERM); 1155 kill_sent++; 1156 } 1157 status |= wait_many(FLAG_WAIT_ATLEAST_ONE); 1158 return status; 1159} 1160 1161static void signal_cancel(int sig FSCK_ATTR((unused))) 1162{ 1163 cancel_requested++; 1164} 1165 1166static void PRS(int argc, char **argv) 1167{ 1168 int i, j; 1169 char *arg, *dev, *tmp = NULL; 1170 char options[128]; 1171 int opt = 0; 1172 int opts_for_fsck = 0; 1173 struct sigaction sa; 1174 1175 /* 1176 * Set up signal action 1177 */ 1178 memset(&sa, 0, sizeof(struct sigaction)); 1179 sa.sa_handler = signal_cancel; 1180 sigaction(SIGINT, &sa, 0); 1181 sigaction(SIGTERM, &sa, 0); 1182 1183 num_devices = 0; 1184 num_args = 0; 1185 instance_list = 0; 1186 1187 for (i=1; i < argc; i++) { 1188 arg = argv[i]; 1189 if (!arg) 1190 continue; 1191 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) { 1192 if (num_devices >= MAX_DEVICES) { 1193 bb_error_msg_and_die("too many devices"); 1194 } 1195 dev = blkid_get_devname(cache, arg, NULL); 1196 if (!dev && strchr(arg, '=')) { 1197 /* 1198 * Check to see if we failed because 1199 * /proc/partitions isn't found. 1200 */ 1201 if (access("/proc/partitions", R_OK) < 0) { 1202 bb_perror_msg_and_die("can't open /proc/partitions " 1203 "(is /proc mounted?)"); 1204 } 1205 /* 1206 * Check to see if this is because 1207 * we're not running as root 1208 */ 1209 if (geteuid()) 1210 bb_error_msg_and_die( 1211 "must be root to scan for matching filesystems: %s\n", arg); 1212 else 1213 bb_error_msg_and_die( 1214 "can't find matching filesystem: %s", arg); 1215 } 1216 devices[num_devices++] = dev ? dev : string_copy(arg); 1217 continue; 1218 } 1219 if (arg[0] != '-' || opts_for_fsck) { 1220 if (num_args >= MAX_ARGS) { 1221 bb_error_msg_and_die("too many arguments"); 1222 } 1223 args[num_args++] = string_copy(arg); 1224 continue; 1225 } 1226 for (j=1; arg[j]; j++) { 1227 if (opts_for_fsck) { 1228 options[++opt] = arg[j]; 1229 continue; 1230 } 1231 switch (arg[j]) { 1232 case 'A': 1233 doall++; 1234 break; 1235 case 'C': 1236 progress++; 1237 if (arg[j+1]) { 1238 progress_fd = string_to_int(arg+j+1); 1239 if (progress_fd < 0) 1240 progress_fd = 0; 1241 else 1242 goto next_arg; 1243 } else if ((i+1) < argc 1244 && argv[i+1][0] != '-') { 1245 progress_fd = string_to_int(argv[i]); 1246 if (progress_fd < 0) 1247 progress_fd = 0; 1248 else { 1249 goto next_arg; 1250 i++; 1251 } 1252 } 1253 break; 1254 case 'V': 1255 verbose++; 1256 break; 1257 case 'N': 1258 noexecute++; 1259 break; 1260 case 'R': 1261 skip_root++; 1262 break; 1263 case 'T': 1264 notitle++; 1265 break; 1266 case 'M': 1267 like_mount++; 1268 break; 1269 case 'P': 1270 parallel_root++; 1271 break; 1272 case 's': 1273 serialize++; 1274 break; 1275 case 't': 1276 tmp = 0; 1277 if (fstype) 1278 bb_show_usage(); 1279 if (arg[j+1]) 1280 tmp = arg+j+1; 1281 else if ((i+1) < argc) 1282 tmp = argv[++i]; 1283 else 1284 bb_show_usage(); 1285 fstype = string_copy(tmp); 1286 compile_fs_type(fstype, &fs_type_compiled); 1287 goto next_arg; 1288 case '-': 1289 opts_for_fsck++; 1290 break; 1291 case '?': 1292 bb_show_usage(); 1293 break; 1294 default: 1295 options[++opt] = arg[j]; 1296 break; 1297 } 1298 } 1299 next_arg: 1300 if (opt) { 1301 options[0] = '-'; 1302 options[++opt] = '\0'; 1303 if (num_args >= MAX_ARGS) { 1304 bb_error_msg("too many arguments"); 1305 } 1306 args[num_args++] = string_copy(options); 1307 opt = 0; 1308 } 1309 } 1310 if (getenv("FSCK_FORCE_ALL_PARALLEL")) 1311 force_all_parallel++; 1312 if ((tmp = getenv("FSCK_MAX_INST"))) 1313 max_running = atoi(tmp); 1314} 1315 1316int fsck_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 1317int fsck_main(int argc, char **argv) 1318{ 1319 int i, status = 0; 1320 int interactive = 0; 1321 const char *fstab; 1322 struct fs_info *fs; 1323 1324 setvbuf(stdout, NULL, _IONBF, BUFSIZ); 1325 setvbuf(stderr, NULL, _IONBF, BUFSIZ); 1326 1327 blkid_get_cache(&cache, NULL); 1328 PRS(argc, argv); 1329 1330 if (!notitle) 1331 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE); 1332 1333 fstab = getenv("FSTAB_FILE"); 1334 if (!fstab) 1335 fstab = _PATH_MNTTAB; 1336 load_fs_info(fstab); 1337 1338 fsck_path = e2fs_set_sbin_path(); 1339 1340 if ((num_devices == 1) || (serialize)) 1341 interactive = 1; 1342 1343 /* If -A was specified ("check all"), do that! */ 1344 if (doall) 1345 return check_all(); 1346 1347 if (num_devices == 0) { 1348 serialize++; 1349 interactive++; 1350 return check_all(); 1351 } 1352 for (i = 0; i < num_devices; i++) { 1353 if (cancel_requested) { 1354 if (!kill_sent) { 1355 kill_all(SIGTERM); 1356 kill_sent++; 1357 } 1358 break; 1359 } 1360 fs = lookup(devices[i]); 1361 if (!fs) { 1362 fs = create_fs_device(devices[i], 0, "auto", 1363 0, -1, -1); 1364 if (!fs) 1365 continue; 1366 } 1367 fsck_device(fs, interactive); 1368 if (serialize || 1369 (max_running && (num_running >= max_running))) { 1370 struct fsck_instance *inst; 1371 1372 inst = wait_one(0); 1373 if (inst) { 1374 status |= inst->exit_status; 1375 free_instance(inst); 1376 } 1377 if (verbose > 1) 1378 printf("----------------------------------\n"); 1379 } 1380 } 1381 status |= wait_many(FLAG_WAIT_ALL); 1382 blkid_put_cache(cache); 1383 return status; 1384} 1385