1/* vi: set sw=4 ts=4: */ 2/* 3 * pfsck --- A generic, parallelizing front-end for the fsck program. 4 * It will automatically try to run fsck programs in parallel if the 5 * devices are on separate spindles. It is based on the same ideas as 6 * the generic front end for fsck by David Engel and Fred van Kempen, 7 * but it has been completely rewritten from scratch to support 8 * parallel execution. 9 * 10 * Written by Theodore Ts'o, <tytso@mit.edu> 11 * 12 * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994: 13 * o Changed -t fstype to behave like with mount when -A (all file 14 * systems) or -M (like mount) is specified. 15 * o fsck looks if it can find the fsck.type program to decide 16 * if it should ignore the fs type. This way more fsck programs 17 * can be added without changing this front-end. 18 * o -R flag skip root file system. 19 * 20 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 21 * 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o. 22 * 23 * %Begin-Header% 24 * This file may be redistributed under the terms of the GNU Public 25 * License. 26 * %End-Header% 27 */ 28 29#include <sys/types.h> 30#include <sys/wait.h> 31#include <sys/stat.h> 32#include <limits.h> 33#include <stdio.h> 34#include <ctype.h> 35#include <string.h> 36#include <time.h> 37#include <stdlib.h> 38#include <errno.h> 39#include <paths.h> 40#include <unistd.h> 41#include <errno.h> 42#include <signal.h> 43 44#include "fsck.h" 45#include "blkid/blkid.h" 46 47#include "e2fsbb.h" 48 49#include "libbb.h" 50 51#ifndef _PATH_MNTTAB 52#define _PATH_MNTTAB "/etc/fstab" 53#endif 54 55/* 56 * fsck.h 57 */ 58 59#ifndef DEFAULT_FSTYPE 60#define DEFAULT_FSTYPE "ext2" 61#endif 62 63#define MAX_DEVICES 32 64#define MAX_ARGS 32 65 66/* 67 * Internal structure for mount tabel entries. 68 */ 69 70struct fs_info { 71 char *device; 72 char *mountpt; 73 char *type; 74 char *opts; 75 int freq; 76 int passno; 77 int flags; 78 struct fs_info *next; 79}; 80 81#define FLAG_DONE 1 82#define FLAG_PROGRESS 2 83 84/* 85 * Structure to allow exit codes to be stored 86 */ 87struct fsck_instance { 88 int pid; 89 int flags; 90 int exit_status; 91 time_t start_time; 92 char * prog; 93 char * type; 94 char * device; 95 char * base_device; 96 struct fsck_instance *next; 97}; 98 99/* 100 * base_device.c 101 * 102 * Return the "base device" given a particular device; this is used to 103 * assure that we only fsck one partition on a particular drive at any 104 * one time. Otherwise, the disk heads will be seeking all over the 105 * place. If the base device cannot be determined, return NULL. 106 * 107 * The base_device() function returns an allocated string which must 108 * be freed. 109 * 110 */ 111 112 113#ifdef CONFIG_FEATURE_DEVFS 114/* 115 * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3 116 * pathames. 117 */ 118static const char *const devfs_hier[] = { 119 "host", "bus", "target", "lun", 0 120}; 121#endif 122 123static char *base_device(const char *device) 124{ 125 char *str, *cp; 126#ifdef CONFIG_FEATURE_DEVFS 127 const char *const *hier; 128 const char *disk; 129 int len; 130#endif 131 132 cp = str = xstrdup(device); 133 134 /* Skip over /dev/; if it's not present, give up. */ 135 if (strncmp(cp, "/dev/", 5) != 0) 136 goto errout; 137 cp += 5; 138 139 /* 140 * For md devices, we treat them all as if they were all 141 * on one disk, since we don't know how to parallelize them. 142 */ 143 if (cp[0] == 'm' && cp[1] == 'd') { 144 *(cp+2) = 0; 145 return str; 146 } 147 148 /* Handle DAC 960 devices */ 149 if (strncmp(cp, "rd/", 3) == 0) { 150 cp += 3; 151 if (cp[0] != 'c' || cp[2] != 'd' || 152 !isdigit(cp[1]) || !isdigit(cp[3])) 153 goto errout; 154 *(cp+4) = 0; 155 return str; 156 } 157 158 /* Now let's handle /dev/hd* and /dev/sd* devices.... */ 159 if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) { 160 cp += 2; 161 /* If there's a single number after /dev/hd, skip it */ 162 if (isdigit(*cp)) 163 cp++; 164 /* What follows must be an alpha char, or give up */ 165 if (!isalpha(*cp)) 166 goto errout; 167 *(cp + 1) = 0; 168 return str; 169 } 170 171#ifdef CONFIG_FEATURE_DEVFS 172 /* Now let's handle devfs (ugh) names */ 173 len = 0; 174 if (strncmp(cp, "ide/", 4) == 0) 175 len = 4; 176 if (strncmp(cp, "scsi/", 5) == 0) 177 len = 5; 178 if (len) { 179 cp += len; 180 /* 181 * Now we proceed down the expected devfs hierarchy. 182 * i.e., .../host1/bus2/target3/lun4/... 183 * If we don't find the expected token, followed by 184 * some number of digits at each level, abort. 185 */ 186 for (hier = devfs_hier; *hier; hier++) { 187 len = strlen(*hier); 188 if (strncmp(cp, *hier, len) != 0) 189 goto errout; 190 cp += len; 191 while (*cp != '/' && *cp != 0) { 192 if (!isdigit(*cp)) 193 goto errout; 194 cp++; 195 } 196 cp++; 197 } 198 *(cp - 1) = 0; 199 return str; 200 } 201 202 /* Now handle devfs /dev/disc or /dev/disk names */ 203 disk = 0; 204 if (strncmp(cp, "discs/", 6) == 0) 205 disk = "disc"; 206 else if (strncmp(cp, "disks/", 6) == 0) 207 disk = "disk"; 208 if (disk) { 209 cp += 6; 210 if (strncmp(cp, disk, 4) != 0) 211 goto errout; 212 cp += 4; 213 while (*cp != '/' && *cp != 0) { 214 if (!isdigit(*cp)) 215 goto errout; 216 cp++; 217 } 218 *cp = 0; 219 return str; 220 } 221#endif 222 223errout: 224 free(str); 225 return NULL; 226} 227 228 229static const char *const ignored_types[] = { 230 "ignore", 231 "iso9660", 232 "nfs", 233 "proc", 234 "sw", 235 "swap", 236 "tmpfs", 237 "devpts", 238 NULL 239}; 240 241static const char *const really_wanted[] = { 242 "minix", 243 "ext2", 244 "ext3", 245 "jfs", 246 "reiserfs", 247 "xiafs", 248 "xfs", 249 NULL 250}; 251 252#define BASE_MD "/dev/md" 253 254/* 255 * Global variables for options 256 */ 257static char *devices[MAX_DEVICES]; 258static char *args[MAX_ARGS]; 259static int num_devices, num_args; 260 261static int verbose; 262static int doall; 263static int noexecute; 264static int serialize; 265static int skip_root; 266static int like_mount; 267static int notitle; 268static int parallel_root; 269static int progress; 270static int progress_fd; 271static int force_all_parallel; 272static int num_running; 273static int max_running; 274static volatile int cancel_requested; 275static int kill_sent; 276static char *fstype; 277static struct fs_info *filesys_info, *filesys_last; 278static struct fsck_instance *instance_list; 279static char *fsck_path; 280static blkid_cache cache; 281 282static char *string_copy(const char *s) 283{ 284 char *ret; 285 286 if (!s) 287 return 0; 288 ret = strdup(s); 289 return ret; 290} 291 292static int string_to_int(const char *s) 293{ 294 long l; 295 char *p; 296 297 l = strtol(s, &p, 0); 298 if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX) 299 return -1; 300 else 301 return (int) l; 302} 303 304static char *skip_over_blank(char *cp) 305{ 306 while (*cp && isspace(*cp)) 307 cp++; 308 return cp; 309} 310 311static char *skip_over_word(char *cp) 312{ 313 while (*cp && !isspace(*cp)) 314 cp++; 315 return cp; 316} 317 318static void strip_line(char *line) 319{ 320 char *p; 321 322 while (*line) { 323 p = line + strlen(line) - 1; 324 if ((*p == '\n') || (*p == '\r')) 325 *p = 0; 326 else 327 break; 328 } 329} 330 331static char *parse_word(char **buf) 332{ 333 char *word, *next; 334 335 word = *buf; 336 if (*word == 0) 337 return 0; 338 339 word = skip_over_blank(word); 340 next = skip_over_word(word); 341 if (*next) 342 *next++ = 0; 343 *buf = next; 344 return word; 345} 346 347static void parse_escape(char *word) 348{ 349 char *q, c; 350 const char *p; 351 352 if (!word) 353 return; 354 355 for (p = q = word; *p; q++) { 356 c = *p++; 357 if (c != '\\') { 358 *q = c; 359 } else { 360 *q = bb_process_escape_sequence(&p); 361 } 362 } 363 *q = 0; 364} 365 366static void free_instance(struct fsck_instance *i) 367{ 368 if (i->prog) 369 free(i->prog); 370 if (i->device) 371 free(i->device); 372 if (i->base_device) 373 free(i->base_device); 374 free(i); 375} 376 377static struct fs_info *create_fs_device(const char *device, const char *mntpnt, 378 const char *type, const char *opts, 379 int freq, int passno) 380{ 381 struct fs_info *fs; 382 383 if (!(fs = malloc(sizeof(struct fs_info)))) 384 return NULL; 385 386 fs->device = string_copy(device); 387 fs->mountpt = string_copy(mntpnt); 388 fs->type = string_copy(type); 389 fs->opts = string_copy(opts ? opts : ""); 390 fs->freq = freq; 391 fs->passno = passno; 392 fs->flags = 0; 393 fs->next = NULL; 394 395 if (!filesys_info) 396 filesys_info = fs; 397 else 398 filesys_last->next = fs; 399 filesys_last = fs; 400 401 return fs; 402} 403 404 405 406static int parse_fstab_line(char *line, struct fs_info **ret_fs) 407{ 408 char *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp; 409 struct fs_info *fs; 410 411 *ret_fs = 0; 412 strip_line(line); 413 if ((cp = strchr(line, '#'))) 414 *cp = 0; /* Ignore everything after the comment char */ 415 cp = line; 416 417 device = parse_word(&cp); 418 mntpnt = parse_word(&cp); 419 type = parse_word(&cp); 420 opts = parse_word(&cp); 421 freq = parse_word(&cp); 422 passno = parse_word(&cp); 423 424 if (!device) 425 return 0; /* Allow blank lines */ 426 427 if (!mntpnt || !type) 428 return -1; 429 430 parse_escape(device); 431 parse_escape(mntpnt); 432 parse_escape(type); 433 parse_escape(opts); 434 parse_escape(freq); 435 parse_escape(passno); 436 437 dev = blkid_get_devname(cache, device, NULL); 438 if (dev) 439 device = dev; 440 441 if (strchr(type, ',')) 442 type = 0; 443 444 fs = create_fs_device(device, mntpnt, type ? type : "auto", opts, 445 freq ? atoi(freq) : -1, 446 passno ? atoi(passno) : -1); 447 if (dev) 448 free(dev); 449 450 if (!fs) 451 return -1; 452 *ret_fs = fs; 453 return 0; 454} 455 456static void interpret_type(struct fs_info *fs) 457{ 458 char *t; 459 460 if (strcmp(fs->type, "auto") != 0) 461 return; 462 t = blkid_get_tag_value(cache, "TYPE", fs->device); 463 if (t) { 464 free(fs->type); 465 fs->type = t; 466 } 467} 468 469/* 470 * Load the filesystem database from /etc/fstab 471 */ 472static void load_fs_info(const char *filename) 473{ 474 FILE *f; 475 char buf[1024]; 476 int lineno = 0; 477 int old_fstab = 1; 478 struct fs_info *fs; 479 480 if ((f = fopen(filename, "r")) == NULL) { 481 bb_perror_msg("WARNING: cannot open %s", filename); 482 return; 483 } 484 while (!feof(f)) { 485 lineno++; 486 if (!fgets(buf, sizeof(buf), f)) 487 break; 488 buf[sizeof(buf)-1] = 0; 489 if (parse_fstab_line(buf, &fs) < 0) { 490 bb_error_msg("WARNING: bad format " 491 "on line %d of %s\n", lineno, filename); 492 continue; 493 } 494 if (!fs) 495 continue; 496 if (fs->passno < 0) 497 fs->passno = 0; 498 else 499 old_fstab = 0; 500 } 501 502 fclose(f); 503 504 if (old_fstab) { 505 fputs("\007\007\007" 506 "WARNING: Your /etc/fstab does not contain the fsck passno\n" 507 " field. I will kludge around things for you, but you\n" 508 " should fix your /etc/fstab file as soon as you can.\n\n", stderr); 509 510 for (fs = filesys_info; fs; fs = fs->next) { 511 fs->passno = 1; 512 } 513 } 514} 515 516/* Lookup filesys in /etc/fstab and return the corresponding entry. */ 517static struct fs_info *lookup(char *filesys) 518{ 519 struct fs_info *fs; 520 521 /* No filesys name given. */ 522 if (filesys == NULL) 523 return NULL; 524 525 for (fs = filesys_info; fs; fs = fs->next) { 526 if (!strcmp(filesys, fs->device) || 527 (fs->mountpt && !strcmp(filesys, fs->mountpt))) 528 break; 529 } 530 531 return fs; 532} 533 534/* Find fsck program for a given fs type. */ 535static char *find_fsck(char *type) 536{ 537 char *s; 538 const char *tpl; 539 char *p = string_copy(fsck_path); 540 struct stat st; 541 542 /* Are we looking for a program or just a type? */ 543 tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s"); 544 545 for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) { 546 s = xasprintf(tpl, s, type); 547 if (stat(s, &st) == 0) break; 548 free(s); 549 } 550 free(p); 551 return s; 552} 553 554static int progress_active(void) 555{ 556 struct fsck_instance *inst; 557 558 for (inst = instance_list; inst; inst = inst->next) { 559 if (inst->flags & FLAG_DONE) 560 continue; 561 if (inst->flags & FLAG_PROGRESS) 562 return 1; 563 } 564 return 0; 565} 566 567/* 568 * Execute a particular fsck program, and link it into the list of 569 * child processes we are waiting for. 570 */ 571static int execute(const char *type, const char *device, const char *mntpt, 572 int interactive) 573{ 574 char *s, *argv[80]; 575 char *prog; 576 int argc, i; 577 struct fsck_instance *inst, *p; 578 pid_t pid; 579 580 inst = malloc(sizeof(struct fsck_instance)); 581 if (!inst) 582 return ENOMEM; 583 memset(inst, 0, sizeof(struct fsck_instance)); 584 585 prog = xasprintf("fsck.%s", type); 586 argv[0] = prog; 587 argc = 1; 588 589 for (i=0; i <num_args; i++) 590 argv[argc++] = string_copy(args[i]); 591 592 if (progress && !progress_active()) { 593 if ((strcmp(type, "ext2") == 0) || 594 (strcmp(type, "ext3") == 0)) { 595 char tmp[80]; 596 snprintf(tmp, 80, "-C%d", progress_fd); 597 argv[argc++] = string_copy(tmp); 598 inst->flags |= FLAG_PROGRESS; 599 } 600 } 601 602 argv[argc++] = string_copy(device); 603 argv[argc] = 0; 604 605 s = find_fsck(prog); 606 if (s == NULL) { 607 bb_error_msg("%s: not found", prog); 608 return ENOENT; 609 } 610 611 if (verbose || noexecute) { 612 printf("[%s (%d) -- %s] ", s, num_running, 613 mntpt ? mntpt : device); 614 for (i=0; i < argc; i++) 615 printf("%s ", argv[i]); 616 puts(""); 617 } 618 619 /* Fork and execute the correct program. */ 620 if (noexecute) 621 pid = -1; 622 else if ((pid = fork()) < 0) { 623 perror("fork"); 624 return errno; 625 } else if (pid == 0) { 626 if (!interactive) 627 close(0); 628 (void) execv(s, argv); 629 bb_perror_msg_and_die("%s", argv[0]); 630 } 631 632 for (i = 1; i < argc; i++) 633 free(argv[i]); 634 635 free(s); 636 inst->pid = pid; 637 inst->prog = prog; 638 inst->type = string_copy(type); 639 inst->device = string_copy(device); 640 inst->base_device = base_device(device); 641 inst->start_time = time(0); 642 inst->next = NULL; 643 644 /* 645 * Find the end of the list, so we add the instance on at the end. 646 */ 647 for (p = instance_list; p && p->next; p = p->next); 648 649 if (p) 650 p->next = inst; 651 else 652 instance_list = inst; 653 654 return 0; 655} 656 657/* 658 * Send a signal to all outstanding fsck child processes 659 */ 660static int kill_all(int signum) 661{ 662 struct fsck_instance *inst; 663 int n = 0; 664 665 for (inst = instance_list; inst; inst = inst->next) { 666 if (inst->flags & FLAG_DONE) 667 continue; 668 kill(inst->pid, signum); 669 n++; 670 } 671 return n; 672} 673 674/* 675 * Wait for one child process to exit; when it does, unlink it from 676 * the list of executing child processes, and return it. 677 */ 678static struct fsck_instance *wait_one(int flags) 679{ 680 int status; 681 int sig; 682 struct fsck_instance *inst, *inst2, *prev; 683 pid_t pid; 684 685 if (!instance_list) 686 return NULL; 687 688 if (noexecute) { 689 inst = instance_list; 690 prev = 0; 691#ifdef RANDOM_DEBUG 692 while (inst->next && (random() & 1)) { 693 prev = inst; 694 inst = inst->next; 695 } 696#endif 697 inst->exit_status = 0; 698 goto ret_inst; 699 } 700 701 /* 702 * gcc -Wall fails saving throw against stupidity 703 * (inst and prev are thought to be uninitialized variables) 704 */ 705 inst = prev = NULL; 706 707 do { 708 pid = waitpid(-1, &status, flags); 709 if (cancel_requested && !kill_sent) { 710 kill_all(SIGTERM); 711 kill_sent++; 712 } 713 if ((pid == 0) && (flags & WNOHANG)) 714 return NULL; 715 if (pid < 0) { 716 if ((errno == EINTR) || (errno == EAGAIN)) 717 continue; 718 if (errno == ECHILD) { 719 bb_error_msg("wait: no more child process?!?"); 720 return NULL; 721 } 722 perror("wait"); 723 continue; 724 } 725 for (prev = 0, inst = instance_list; 726 inst; 727 prev = inst, inst = inst->next) { 728 if (inst->pid == pid) 729 break; 730 } 731 } while (!inst); 732 733 if (WIFEXITED(status)) 734 status = WEXITSTATUS(status); 735 else if (WIFSIGNALED(status)) { 736 sig = WTERMSIG(status); 737 if (sig == SIGINT) { 738 status = EXIT_UNCORRECTED; 739 } else { 740 printf("Warning... %s for device %s exited " 741 "with signal %d.\n", 742 inst->prog, inst->device, sig); 743 status = EXIT_ERROR; 744 } 745 } else { 746 printf("%s %s: status is %x, should never happen.\n", 747 inst->prog, inst->device, status); 748 status = EXIT_ERROR; 749 } 750 inst->exit_status = status; 751 if (progress && (inst->flags & FLAG_PROGRESS) && 752 !progress_active()) { 753 for (inst2 = instance_list; inst2; inst2 = inst2->next) { 754 if (inst2->flags & FLAG_DONE) 755 continue; 756 if (strcmp(inst2->type, "ext2") && 757 strcmp(inst2->type, "ext3")) 758 continue; 759 /* 760 * If we've just started the fsck, wait a tiny 761 * bit before sending the kill, to give it 762 * time to set up the signal handler 763 */ 764 if (inst2->start_time < time(0)+2) { 765 if (fork() == 0) { 766 sleep(1); 767 kill(inst2->pid, SIGUSR1); 768 exit(0); 769 } 770 } else 771 kill(inst2->pid, SIGUSR1); 772 inst2->flags |= FLAG_PROGRESS; 773 break; 774 } 775 } 776ret_inst: 777 if (prev) 778 prev->next = inst->next; 779 else 780 instance_list = inst->next; 781 if (verbose > 1) 782 printf("Finished with %s (exit status %d)\n", 783 inst->device, inst->exit_status); 784 num_running--; 785 return inst; 786} 787 788#define FLAG_WAIT_ALL 0 789#define FLAG_WAIT_ATLEAST_ONE 1 790/* 791 * Wait until all executing child processes have exited; return the 792 * logical OR of all of their exit code values. 793 */ 794static int wait_many(int flags) 795{ 796 struct fsck_instance *inst; 797 int global_status = 0; 798 int wait_flags = 0; 799 800 while ((inst = wait_one(wait_flags))) { 801 global_status |= inst->exit_status; 802 free_instance(inst); 803#ifdef RANDOM_DEBUG 804 if (noexecute && (flags & WNOHANG) && !(random() % 3)) 805 break; 806#endif 807 if (flags & FLAG_WAIT_ATLEAST_ONE) 808 wait_flags = WNOHANG; 809 } 810 return global_status; 811} 812 813/* 814 * Run the fsck program on a particular device 815 * 816 * If the type is specified using -t, and it isn't prefixed with "no" 817 * (as in "noext2") and only one filesystem type is specified, then 818 * use that type regardless of what is specified in /etc/fstab. 819 * 820 * If the type isn't specified by the user, then use either the type 821 * specified in /etc/fstab, or DEFAULT_FSTYPE. 822 */ 823static void fsck_device(struct fs_info *fs, int interactive) 824{ 825 const char *type; 826 int retval; 827 828 interpret_type(fs); 829 830 if (strcmp(fs->type, "auto") != 0) 831 type = fs->type; 832 else if (fstype && strncmp(fstype, "no", 2) && 833 strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) && 834 !strchr(fstype, ',')) 835 type = fstype; 836 else 837 type = DEFAULT_FSTYPE; 838 839 num_running++; 840 retval = execute(type, fs->device, fs->mountpt, interactive); 841 if (retval) { 842 bb_error_msg("error %d while executing fsck.%s for %s", 843 retval, type, fs->device); 844 num_running--; 845 } 846} 847 848 849/* 850 * Deal with the fsck -t argument. 851 */ 852struct fs_type_compile { 853 char **list; 854 int *type; 855 int negate; 856} fs_type_compiled; 857 858#define FS_TYPE_NORMAL 0 859#define FS_TYPE_OPT 1 860#define FS_TYPE_NEGOPT 2 861 862static const char fs_type_syntax_error[] = 863"Either all or none of the filesystem types passed to -t must be prefixed\n" 864 "with 'no' or '!'."; 865 866static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp) 867{ 868 char *cp, *list, *s; 869 int num = 2; 870 int negate, first_negate = 1; 871 872 if (fs_type) { 873 for (cp=fs_type; *cp; cp++) { 874 if (*cp == ',') 875 num++; 876 } 877 } 878 879 cmp->list = xzalloc(num * sizeof(char *)); 880 cmp->type = xzalloc(num * sizeof(int)); 881 cmp->negate = 0; 882 883 if (!fs_type) 884 return; 885 886 list = string_copy(fs_type); 887 num = 0; 888 s = strtok(list, ","); 889 while(s) { 890 negate = 0; 891 if (strncmp(s, "no", 2) == 0) { 892 s += 2; 893 negate = 1; 894 } else if (*s == '!') { 895 s++; 896 negate = 1; 897 } 898 if (strcmp(s, "loop") == 0) 899 /* loop is really short-hand for opts=loop */ 900 goto loop_special_case; 901 else if (strncmp(s, "opts=", 5) == 0) { 902 s += 5; 903 loop_special_case: 904 cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT; 905 } else { 906 if (first_negate) { 907 cmp->negate = negate; 908 first_negate = 0; 909 } 910 if ((negate && !cmp->negate) || 911 (!negate && cmp->negate)) { 912 bb_error_msg_and_die("%s", fs_type_syntax_error); 913 } 914 } 915 cmp->list[num++] = string_copy(s); 916 s = strtok(NULL, ","); 917 } 918 free(list); 919} 920 921/* 922 * This function returns true if a particular option appears in a 923 * comma-delimited options list 924 */ 925static int opt_in_list(char *opt, char *optlist) 926{ 927 char *list, *s; 928 929 if (!optlist) 930 return 0; 931 list = string_copy(optlist); 932 933 s = strtok(list, ","); 934 while(s) { 935 if (strcmp(s, opt) == 0) { 936 free(list); 937 return 1; 938 } 939 s = strtok(NULL, ","); 940 } 941 free(list); 942 return 0; 943} 944 945/* See if the filesystem matches the criteria given by the -t option */ 946static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp) 947{ 948 int n, ret = 0, checked_type = 0; 949 char *cp; 950 951 if (cmp->list == 0 || cmp->list[0] == 0) 952 return 1; 953 954 for (n=0; (cp = cmp->list[n]); n++) { 955 switch (cmp->type[n]) { 956 case FS_TYPE_NORMAL: 957 checked_type++; 958 if (strcmp(cp, fs->type) == 0) { 959 ret = 1; 960 } 961 break; 962 case FS_TYPE_NEGOPT: 963 if (opt_in_list(cp, fs->opts)) 964 return 0; 965 break; 966 case FS_TYPE_OPT: 967 if (!opt_in_list(cp, fs->opts)) 968 return 0; 969 break; 970 } 971 } 972 if (checked_type == 0) 973 return 1; 974 return (cmp->negate ? !ret : ret); 975} 976 977/* Check if we should ignore this filesystem. */ 978static int ignore(struct fs_info *fs) 979{ 980 int wanted; 981 char *s; 982 983 /* 984 * If the pass number is 0, ignore it. 985 */ 986 if (fs->passno == 0) 987 return 1; 988 989 interpret_type(fs); 990 991 /* 992 * If a specific fstype is specified, and it doesn't match, 993 * ignore it. 994 */ 995 if (!fs_match(fs, &fs_type_compiled)) return 1; 996 997 /* Are we ignoring this type? */ 998 if (index_in_str_array(ignored_types, fs->type) >= 0) 999 return 1; 1000 1001 /* Do we really really want to check this fs? */ 1002 wanted = index_in_str_array(really_wanted, fs->type) >= 0; 1003 1004 /* See if the <fsck.fs> program is available. */ 1005 s = find_fsck(fs->type); 1006 if (s == NULL) { 1007 if (wanted) 1008 bb_error_msg("cannot check %s: fsck.%s not found", 1009 fs->device, fs->type); 1010 return 1; 1011 } 1012 free(s); 1013 1014 /* We can and want to check this file system type. */ 1015 return 0; 1016} 1017 1018/* 1019 * Returns TRUE if a partition on the same disk is already being 1020 * checked. 1021 */ 1022static int device_already_active(char *device) 1023{ 1024 struct fsck_instance *inst; 1025 char *base; 1026 1027 if (force_all_parallel) 1028 return 0; 1029 1030#ifdef BASE_MD 1031 /* Don't check a soft raid disk with any other disk */ 1032 if (instance_list && 1033 (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) || 1034 !strncmp(device, BASE_MD, sizeof(BASE_MD)-1))) 1035 return 1; 1036#endif 1037 1038 base = base_device(device); 1039 /* 1040 * If we don't know the base device, assume that the device is 1041 * already active if there are any fsck instances running. 1042 */ 1043 if (!base) 1044 return (instance_list != 0); 1045 for (inst = instance_list; inst; inst = inst->next) { 1046 if (!inst->base_device || !strcmp(base, inst->base_device)) { 1047 free(base); 1048 return 1; 1049 } 1050 } 1051 free(base); 1052 return 0; 1053} 1054 1055/* Check all file systems, using the /etc/fstab table. */ 1056static int check_all(void) 1057{ 1058 struct fs_info *fs = NULL; 1059 int status = EXIT_OK; 1060 int not_done_yet = 1; 1061 int passno = 1; 1062 int pass_done; 1063 1064 if (verbose) 1065 fputs("Checking all file systems.\n", stdout); 1066 1067 /* 1068 * Do an initial scan over the filesystem; mark filesystems 1069 * which should be ignored as done, and resolve any "auto" 1070 * filesystem types (done as a side-effect of calling ignore()). 1071 */ 1072 for (fs = filesys_info; fs; fs = fs->next) { 1073 if (ignore(fs)) 1074 fs->flags |= FLAG_DONE; 1075 } 1076 1077 /* 1078 * Find and check the root filesystem. 1079 */ 1080 if (!parallel_root) { 1081 for (fs = filesys_info; fs; fs = fs->next) { 1082 if (LONE_CHAR(fs->mountpt, '/')) 1083 break; 1084 } 1085 if (fs) { 1086 if (!skip_root && !ignore(fs)) { 1087 fsck_device(fs, 1); 1088 status |= wait_many(FLAG_WAIT_ALL); 1089 if (status > EXIT_NONDESTRUCT) 1090 return status; 1091 } 1092 fs->flags |= FLAG_DONE; 1093 } 1094 } 1095 /* 1096 * This is for the bone-headed user who enters the root 1097 * filesystem twice. Skip root will skep all root entries. 1098 */ 1099 if (skip_root) 1100 for (fs = filesys_info; fs; fs = fs->next) 1101 if (LONE_CHAR(fs->mountpt, '/')) 1102 fs->flags |= FLAG_DONE; 1103 1104 while (not_done_yet) { 1105 not_done_yet = 0; 1106 pass_done = 1; 1107 1108 for (fs = filesys_info; fs; fs = fs->next) { 1109 if (cancel_requested) 1110 break; 1111 if (fs->flags & FLAG_DONE) 1112 continue; 1113 /* 1114 * If the filesystem's pass number is higher 1115 * than the current pass number, then we don't 1116 * do it yet. 1117 */ 1118 if (fs->passno > passno) { 1119 not_done_yet++; 1120 continue; 1121 } 1122 /* 1123 * If a filesystem on a particular device has 1124 * already been spawned, then we need to defer 1125 * this to another pass. 1126 */ 1127 if (device_already_active(fs->device)) { 1128 pass_done = 0; 1129 continue; 1130 } 1131 /* 1132 * Spawn off the fsck process 1133 */ 1134 fsck_device(fs, serialize); 1135 fs->flags |= FLAG_DONE; 1136 1137 /* 1138 * Only do one filesystem at a time, or if we 1139 * have a limit on the number of fsck's extant 1140 * at one time, apply that limit. 1141 */ 1142 if (serialize || 1143 (max_running && (num_running >= max_running))) { 1144 pass_done = 0; 1145 break; 1146 } 1147 } 1148 if (cancel_requested) 1149 break; 1150 if (verbose > 1) 1151 printf("--waiting-- (pass %d)\n", passno); 1152 status |= wait_many(pass_done ? FLAG_WAIT_ALL : 1153 FLAG_WAIT_ATLEAST_ONE); 1154 if (pass_done) { 1155 if (verbose > 1) 1156 printf("----------------------------------\n"); 1157 passno++; 1158 } else 1159 not_done_yet++; 1160 } 1161 if (cancel_requested && !kill_sent) { 1162 kill_all(SIGTERM); 1163 kill_sent++; 1164 } 1165 status |= wait_many(FLAG_WAIT_ATLEAST_ONE); 1166 return status; 1167} 1168 1169static void signal_cancel(int sig FSCK_ATTR((unused))) 1170{ 1171 cancel_requested++; 1172} 1173 1174static void PRS(int argc, char **argv) 1175{ 1176 int i, j; 1177 char *arg, *dev, *tmp = 0; 1178 char options[128]; 1179 int opt = 0; 1180 int opts_for_fsck = 0; 1181 struct sigaction sa; 1182 1183 /* 1184 * Set up signal action 1185 */ 1186 memset(&sa, 0, sizeof(struct sigaction)); 1187 sa.sa_handler = signal_cancel; 1188 sigaction(SIGINT, &sa, 0); 1189 sigaction(SIGTERM, &sa, 0); 1190 1191 num_devices = 0; 1192 num_args = 0; 1193 instance_list = 0; 1194 1195 for (i=1; i < argc; i++) { 1196 arg = argv[i]; 1197 if (!arg) 1198 continue; 1199 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) { 1200 if (num_devices >= MAX_DEVICES) { 1201 bb_error_msg_and_die("too many devices"); 1202 } 1203 dev = blkid_get_devname(cache, arg, NULL); 1204 if (!dev && strchr(arg, '=')) { 1205 /* 1206 * Check to see if we failed because 1207 * /proc/partitions isn't found. 1208 */ 1209 if (access("/proc/partitions", R_OK) < 0) { 1210 bb_perror_msg_and_die("cannot open /proc/partitions " 1211 "(is /proc mounted?)"); 1212 } 1213 /* 1214 * Check to see if this is because 1215 * we're not running as root 1216 */ 1217 if (geteuid()) 1218 bb_error_msg_and_die( 1219 "must be root to scan for matching filesystems: %s\n", arg); 1220 else 1221 bb_error_msg_and_die( 1222 "cannot find matching filesystem: %s", arg); 1223 } 1224 devices[num_devices++] = dev ? dev : string_copy(arg); 1225 continue; 1226 } 1227 if (arg[0] != '-' || opts_for_fsck) { 1228 if (num_args >= MAX_ARGS) { 1229 bb_error_msg_and_die("too many arguments"); 1230 } 1231 args[num_args++] = string_copy(arg); 1232 continue; 1233 } 1234 for (j=1; arg[j]; j++) { 1235 if (opts_for_fsck) { 1236 options[++opt] = arg[j]; 1237 continue; 1238 } 1239 switch (arg[j]) { 1240 case 'A': 1241 doall++; 1242 break; 1243 case 'C': 1244 progress++; 1245 if (arg[j+1]) { 1246 progress_fd = string_to_int(arg+j+1); 1247 if (progress_fd < 0) 1248 progress_fd = 0; 1249 else 1250 goto next_arg; 1251 } else if ((i+1) < argc 1252 && argv[i+1][0] != '-') { 1253 progress_fd = string_to_int(argv[i]); 1254 if (progress_fd < 0) 1255 progress_fd = 0; 1256 else { 1257 goto next_arg; 1258 i++; 1259 } 1260 } 1261 break; 1262 case 'V': 1263 verbose++; 1264 break; 1265 case 'N': 1266 noexecute++; 1267 break; 1268 case 'R': 1269 skip_root++; 1270 break; 1271 case 'T': 1272 notitle++; 1273 break; 1274 case 'M': 1275 like_mount++; 1276 break; 1277 case 'P': 1278 parallel_root++; 1279 break; 1280 case 's': 1281 serialize++; 1282 break; 1283 case 't': 1284 tmp = 0; 1285 if (fstype) 1286 bb_show_usage(); 1287 if (arg[j+1]) 1288 tmp = arg+j+1; 1289 else if ((i+1) < argc) 1290 tmp = argv[++i]; 1291 else 1292 bb_show_usage(); 1293 fstype = string_copy(tmp); 1294 compile_fs_type(fstype, &fs_type_compiled); 1295 goto next_arg; 1296 case '-': 1297 opts_for_fsck++; 1298 break; 1299 case '?': 1300 bb_show_usage(); 1301 break; 1302 default: 1303 options[++opt] = arg[j]; 1304 break; 1305 } 1306 } 1307 next_arg: 1308 if (opt) { 1309 options[0] = '-'; 1310 options[++opt] = '\0'; 1311 if (num_args >= MAX_ARGS) { 1312 bb_error_msg("too many arguments"); 1313 } 1314 args[num_args++] = string_copy(options); 1315 opt = 0; 1316 } 1317 } 1318 if (getenv("FSCK_FORCE_ALL_PARALLEL")) 1319 force_all_parallel++; 1320 if ((tmp = getenv("FSCK_MAX_INST"))) 1321 max_running = atoi(tmp); 1322} 1323 1324int fsck_main(int argc, char **argv); 1325int fsck_main(int argc, char **argv) 1326{ 1327 int i, status = 0; 1328 int interactive = 0; 1329 const char *fstab; 1330 struct fs_info *fs; 1331 1332 setvbuf(stdout, NULL, _IONBF, BUFSIZ); 1333 setvbuf(stderr, NULL, _IONBF, BUFSIZ); 1334 1335 blkid_get_cache(&cache, NULL); 1336 PRS(argc, argv); 1337 1338 if (!notitle) 1339 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE); 1340 1341 fstab = getenv("FSTAB_FILE"); 1342 if (!fstab) 1343 fstab = _PATH_MNTTAB; 1344 load_fs_info(fstab); 1345 1346 fsck_path = e2fs_set_sbin_path(); 1347 1348 if ((num_devices == 1) || (serialize)) 1349 interactive = 1; 1350 1351 /* If -A was specified ("check all"), do that! */ 1352 if (doall) 1353 return check_all(); 1354 1355 if (num_devices == 0) { 1356 serialize++; 1357 interactive++; 1358 return check_all(); 1359 } 1360 for (i = 0; i < num_devices; i++) { 1361 if (cancel_requested) { 1362 if (!kill_sent) { 1363 kill_all(SIGTERM); 1364 kill_sent++; 1365 } 1366 break; 1367 } 1368 fs = lookup(devices[i]); 1369 if (!fs) { 1370 fs = create_fs_device(devices[i], 0, "auto", 1371 0, -1, -1); 1372 if (!fs) 1373 continue; 1374 } 1375 fsck_device(fs, interactive); 1376 if (serialize || 1377 (max_running && (num_running >= max_running))) { 1378 struct fsck_instance *inst; 1379 1380 inst = wait_one(0); 1381 if (inst) { 1382 status |= inst->exit_status; 1383 free_instance(inst); 1384 } 1385 if (verbose > 1) 1386 printf("----------------------------------\n"); 1387 } 1388 } 1389 status |= wait_many(FLAG_WAIT_ALL); 1390 blkid_put_cache(cache); 1391 return status; 1392} 1393