1/* vi: set sw=4 ts=4: */ 2/* 3 * fsck.c - a file system consistency checker for Linux. 4 * 5 * (C) 1991, 1992 Linus Torvalds. 6 * 7 * Licensed under GPLv2, see file LICENSE in this tarball for details. 8 */ 9 10/* 11 * 09.11.91 - made the first rudimentary functions 12 * 13 * 10.11.91 - updated, does checking, no repairs yet. 14 * Sent out to the mailing-list for testing. 15 * 16 * 14.11.91 - Testing seems to have gone well. Added some 17 * correction-code, and changed some functions. 18 * 19 * 15.11.91 - More correction code. Hopefully it notices most 20 * cases now, and tries to do something about them. 21 * 22 * 16.11.91 - More corrections (thanks to Mika Jalava). Most 23 * things seem to work now. Yeah, sure. 24 * 25 * 26 * 19.04.92 - Had to start over again from this old version, as a 27 * kernel bug ate my enhanced fsck in february. 28 * 29 * 28.02.93 - added support for different directory entry sizes.. 30 * 31 * Sat Mar 6 18:59:42 1993, faith@cs.unc.edu: Output namelen with 32 * super-block information 33 * 34 * Sat Oct 9 11:17:11 1993, faith@cs.unc.edu: make exit status conform 35 * to that required by fsutil 36 * 37 * Mon Jan 3 11:06:52 1994 - Dr. Wettstein (greg%wind.uucp@plains.nodak.edu) 38 * Added support for file system valid flag. Also 39 * added program_version variable and output of 40 * program name and version number when program 41 * is executed. 42 * 43 * 30.10.94 - added support for v2 filesystem 44 * (Andreas Schwab, schwab@issan.informatik.uni-dortmund.de) 45 * 46 * 10.12.94 - added test to prevent checking of mounted fs adapted 47 * from Theodore Ts'o's (tytso@athena.mit.edu) e2fsck 48 * program. (Daniel Quinlan, quinlan@yggdrasil.com) 49 * 50 * 01.07.96 - Fixed the v2 fs stuff to use the right #defines and such 51 * for modern libcs (janl@math.uio.no, Nicolai Langfeldt) 52 * 53 * 02.07.96 - Added C bit fiddling routines from rmk@ecs.soton.ac.uk 54 * (Russell King). He made them for ARM. It would seem 55 * that the ARM is powerful enough to do this in C whereas 56 * i386 and m64k must use assembly to get it fast >:-) 57 * This should make minix fsck system-independent. 58 * (janl@math.uio.no, Nicolai Langfeldt) 59 * 60 * 04.11.96 - Added minor fixes from Andreas Schwab to avoid compiler 61 * warnings. Added mc68k bitops from 62 * Joerg Dorchain <dorchain@mpi-sb.mpg.de>. 63 * 64 * 06.11.96 - Added v2 code submitted by Joerg Dorchain, but written by 65 * Andreas Schwab. 66 * 67 * 1999-02-22 Arkadiusz Mi�kiewicz <misiek@misiek.eu.org> 68 * - added Native Language Support 69 * 70 * 71 * I've had no time to add comments - hopefully the function names 72 * are comments enough. As with all file system checkers, this assumes 73 * the file system is quiescent - don't use it on a mounted device 74 * unless you can be sure nobody is writing to it (and remember that the 75 * kernel can write to it when it searches for files). 76 * 77 * Usage: fsck [-larvsm] device 78 * -l for a listing of all the filenames 79 * -a for automatic repairs (not implemented) 80 * -r for repairs (interactive) (not implemented) 81 * -v for verbose (tells how many files) 82 * -s for super-block info 83 * -m for minix-like "mode not cleared" warnings 84 * -f force filesystem check even if filesystem marked as valid 85 * 86 * The device may be a block device or a image of one, but this isn't 87 * enforced (but it's not much fun on a character device :-). 88 */ 89 90#include <mntent.h> 91#include "libbb.h" 92#include "minix.h" 93 94#ifndef BLKGETSIZE 95#define BLKGETSIZE _IO(0x12,96) /* return device size */ 96#endif 97 98enum { 99#ifdef UNUSED 100 MINIX1_LINK_MAX = 250, 101 MINIX2_LINK_MAX = 65530, 102 MINIX_I_MAP_SLOTS = 8, 103 MINIX_Z_MAP_SLOTS = 64, 104 MINIX_V1 = 0x0001, /* original minix fs */ 105 MINIX_V2 = 0x0002, /* minix V2 fs */ 106#endif 107 MINIX_NAME_MAX = 255, /* # chars in a file name */ 108}; 109 110#if !ENABLE_FEATURE_MINIX2 111enum { version2 = 0 }; 112#endif 113 114enum { MAX_DEPTH = 32 }; 115 116struct globals { 117 int dev_fd; 118#if ENABLE_FEATURE_MINIX2 119 smallint version2; 120#endif 121 smallint repair, automatic, verbose, list, show, warn_mode, force; 122 smallint changed; /* is filesystem modified? */ 123 smallint errors_uncorrected; /* flag if some error was not corrected */ 124 smallint termios_set; 125 smallint dirsize; 126 smallint namelen; 127 char *device_name; 128 int directory, regular, blockdev, chardev, links, symlinks, total; 129 char *inode_buffer; 130 131 char *inode_map; 132 char *zone_map; 133 134 unsigned char *inode_count; 135 unsigned char *zone_count; 136 137 /* File-name data */ 138 int name_depth; 139 char *name_component[MAX_DEPTH+1]; 140 141 /* Bigger stuff */ 142 struct termios sv_termios; 143 char super_block_buffer[BLOCK_SIZE]; 144 char add_zone_ind_blk[BLOCK_SIZE]; 145 char add_zone_dind_blk[BLOCK_SIZE]; 146 USE_FEATURE_MINIX2(char add_zone_tind_blk[BLOCK_SIZE];) 147 char check_file_blk[BLOCK_SIZE]; 148 149 /* File-name data */ 150 char current_name[MAX_DEPTH * MINIX_NAME_MAX]; 151}; 152 153#define G (*ptr_to_globals) 154#define dev_fd (G.dev_fd ) 155#if ENABLE_FEATURE_MINIX2 156#define version2 (G.version2 ) 157#endif 158#define repair (G.repair ) 159#define automatic (G.automatic ) 160#define verbose (G.verbose ) 161#define list (G.list ) 162#define show (G.show ) 163#define warn_mode (G.warn_mode ) 164#define force (G.force ) 165#define changed (G.changed ) 166#define errors_uncorrected (G.errors_uncorrected ) 167#define termios_set (G.termios_set ) 168#define dirsize (G.dirsize ) 169#define namelen (G.namelen ) 170#define device_name (G.device_name ) 171#define directory (G.directory ) 172#define regular (G.regular ) 173#define blockdev (G.blockdev ) 174#define chardev (G.chardev ) 175#define links (G.links ) 176#define symlinks (G.symlinks ) 177#define total (G.total ) 178#define inode_buffer (G.inode_buffer ) 179#define inode_map (G.inode_map ) 180#define zone_map (G.zone_map ) 181#define inode_count (G.inode_count ) 182#define zone_count (G.zone_count ) 183#define name_depth (G.name_depth ) 184#define name_component (G.name_component ) 185#define sv_termios (G.sv_termios ) 186#define super_block_buffer (G.super_block_buffer ) 187#define add_zone_ind_blk (G.add_zone_ind_blk ) 188#define add_zone_dind_blk (G.add_zone_dind_blk ) 189#define add_zone_tind_blk (G.add_zone_tind_blk ) 190#define check_file_blk (G.check_file_blk ) 191#define current_name (G.current_name ) 192#define INIT_G() do { \ 193 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \ 194 dirsize = 16; \ 195 namelen = 14; \ 196 current_name[0] = '/'; \ 197 /*current_name[1] = '\0';*/ \ 198 name_component[0] = ¤t_name[0]; \ 199} while (0) 200 201#define Inode1 (((struct minix1_inode *) inode_buffer)-1) 202#define Inode2 (((struct minix2_inode *) inode_buffer)-1) 203 204#define Super (*(struct minix_super_block *)(super_block_buffer)) 205 206#if ENABLE_FEATURE_MINIX2 207# define ZONES ((unsigned)(version2 ? Super.s_zones : Super.s_nzones)) 208#else 209# define ZONES ((unsigned)(Super.s_nzones)) 210#endif 211#define INODES ((unsigned)Super.s_ninodes) 212#define IMAPS ((unsigned)Super.s_imap_blocks) 213#define ZMAPS ((unsigned)Super.s_zmap_blocks) 214#define FIRSTZONE ((unsigned)Super.s_firstdatazone) 215#define ZONESIZE ((unsigned)Super.s_log_zone_size) 216#define MAXSIZE ((unsigned)Super.s_max_size) 217#define MAGIC (Super.s_magic) 218 219/* gcc likes this more (code is smaller) than macro variant */ 220static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n) 221{ 222 return (size + n-1) / n; 223} 224 225#if ENABLE_FEATURE_MINIX2 226#define INODE_BLOCKS div_roundup(INODES, (version2 ? MINIX2_INODES_PER_BLOCK \ 227 : MINIX1_INODES_PER_BLOCK)) 228#else 229#define INODE_BLOCKS div_roundup(INODES, MINIX1_INODES_PER_BLOCK) 230#endif 231 232#define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE) 233#define NORM_FIRSTZONE (2 + IMAPS + ZMAPS + INODE_BLOCKS) 234 235/* Before you ask "where they come from?": */ 236/* setbit/clrbit are supplied by sys/param.h */ 237 238static int minix_bit(const char *a, unsigned i) 239{ 240 return (a[i >> 3] & (1<<(i & 7))); 241} 242 243static void minix_setbit(char *a, unsigned i) 244{ 245 setbit(a, i); 246 changed = 1; 247} 248static void minix_clrbit(char *a, unsigned i) 249{ 250 clrbit(a, i); 251 changed = 1; 252} 253 254/* Note: do not assume 0/1, it is 0/nonzero */ 255#define zone_in_use(x) (minix_bit(zone_map,(x)-FIRSTZONE+1)) 256#define inode_in_use(x) (minix_bit(inode_map,(x))) 257 258#define mark_inode(x) (minix_setbit(inode_map,(x))) 259#define unmark_inode(x) (minix_clrbit(inode_map,(x))) 260 261#define mark_zone(x) (minix_setbit(zone_map,(x)-FIRSTZONE+1)) 262#define unmark_zone(x) (minix_clrbit(zone_map,(x)-FIRSTZONE+1)) 263 264 265static void recursive_check(unsigned ino); 266#if ENABLE_FEATURE_MINIX2 267static void recursive_check2(unsigned ino); 268#endif 269 270static void die(const char *str) ATTRIBUTE_NORETURN; 271static void die(const char *str) 272{ 273 if (termios_set) 274 tcsetattr(0, TCSANOW, &sv_termios); 275 bb_error_msg_and_die("%s", str); 276} 277 278static void push_filename(const char *name) 279{ 280 // /dir/dir/dir/file 281 // ^ ^ ^ 282 // [0] [1] [2] <-name_component[i] 283 if (name_depth < MAX_DEPTH) { 284 int len; 285 char *p = name_component[name_depth]; 286 *p++ = '/'; 287 len = sprintf(p, "%.*s", namelen, name); 288 name_component[name_depth + 1] = p + len; 289 } 290 name_depth++; 291} 292 293static void pop_filename(void) 294{ 295 name_depth--; 296 if (name_depth < MAX_DEPTH) { 297 *name_component[name_depth] = '\0'; 298 if (!name_depth) { 299 current_name[0] = '/'; 300 current_name[1] = '\0'; 301 } 302 } 303} 304 305static int ask(const char *string, int def) 306{ 307 int c; 308 309 if (!repair) { 310 puts(""); 311 errors_uncorrected = 1; 312 return 0; 313 } 314 if (automatic) { 315 puts(""); 316 if (!def) 317 errors_uncorrected = 1; 318 return def; 319 } 320 printf(def ? "%s (y/n)? " : "%s (n/y)? ", string); 321 for (;;) { 322 fflush(stdout); 323 c = getchar(); 324 if (c == EOF) { 325 if (!def) 326 errors_uncorrected = 1; 327 return def; 328 } 329 c = toupper(c); 330 if (c == 'Y') { 331 def = 1; 332 break; 333 } else if (c == 'N') { 334 def = 0; 335 break; 336 } else if (c == ' ' || c == '\n') 337 break; 338 } 339 if (def) 340 printf("y\n"); 341 else { 342 printf("n\n"); 343 errors_uncorrected = 1; 344 } 345 return def; 346} 347 348/* 349 * Make certain that we aren't checking a filesystem that is on a 350 * mounted partition. Code adapted from e2fsck, Copyright (C) 1993, 351 * 1994 Theodore Ts'o. Also licensed under GPL. 352 */ 353static void check_mount(void) 354{ 355 FILE *f; 356 struct mntent *mnt; 357 int cont; 358 int fd; 359 360 f = setmntent(MOUNTED, "r"); 361 if (f == NULL) 362 return; 363 while ((mnt = getmntent(f)) != NULL) 364 if (strcmp(device_name, mnt->mnt_fsname) == 0) 365 break; 366 endmntent(f); 367 if (!mnt) 368 return; 369 370 /* 371 * If the root is mounted read-only, then /etc/mtab is 372 * probably not correct; so we won't issue a warning based on 373 * it. 374 */ 375 fd = open(MOUNTED, O_RDWR); 376 if (fd < 0 && errno == EROFS) 377 return; 378 close(fd); 379 380 printf("%s is mounted. ", device_name); 381 cont = 0; 382 if (isatty(0) && isatty(1)) 383 cont = ask("Do you really want to continue", 0); 384 if (!cont) { 385 printf("Check aborted\n"); 386 exit(0); 387 } 388} 389 390/* 391 * check_zone_nr checks to see that *nr is a valid zone nr. If it 392 * isn't, it will possibly be repaired. Check_zone_nr sets *corrected 393 * if an error was corrected, and returns the zone (0 for no zone 394 * or a bad zone-number). 395 */ 396static int check_zone_nr2(uint32_t *nr, smallint *corrected) 397{ 398 const char *msg; 399 if (!*nr) 400 return 0; 401 if (*nr < FIRSTZONE) 402 msg = "< FIRSTZONE"; 403 else if (*nr >= ZONES) 404 msg = ">= ZONES"; 405 else 406 return *nr; 407 printf("Zone nr %s in file '%s'. ", msg, current_name); 408 if (ask("Remove block", 1)) { 409 *nr = 0; 410 *corrected = 1; 411 } 412 return 0; 413} 414 415static int check_zone_nr(uint16_t *nr, smallint *corrected) 416{ 417 uint32_t nr32 = *nr; 418 int r = check_zone_nr2(&nr32, corrected); 419 *nr = (uint16_t)nr32; 420 return r; 421} 422 423/* 424 * read-block reads block nr into the buffer at addr. 425 */ 426static void read_block(unsigned nr, char *addr) 427{ 428 if (!nr) { 429 memset(addr, 0, BLOCK_SIZE); 430 return; 431 } 432 if (BLOCK_SIZE * nr != lseek(dev_fd, BLOCK_SIZE * nr, SEEK_SET)) { 433 printf("%s: cannot seek to block in file '%s'\n", 434 bb_msg_read_error, current_name); 435 errors_uncorrected = 1; 436 memset(addr, 0, BLOCK_SIZE); 437 } else if (BLOCK_SIZE != read(dev_fd, addr, BLOCK_SIZE)) { 438 printf("%s: bad block in file '%s'\n", 439 bb_msg_read_error, current_name); 440 errors_uncorrected = 1; 441 memset(addr, 0, BLOCK_SIZE); 442 } 443} 444 445/* 446 * write_block writes block nr to disk. 447 */ 448static void write_block(unsigned nr, char *addr) 449{ 450 if (!nr) 451 return; 452 if (nr < FIRSTZONE || nr >= ZONES) { 453 printf("Internal error: trying to write bad block\n" 454 "Write request ignored\n"); 455 errors_uncorrected = 1; 456 return; 457 } 458 if (BLOCK_SIZE * nr != lseek(dev_fd, BLOCK_SIZE * nr, SEEK_SET)) 459 die("seek failed in write_block"); 460 if (BLOCK_SIZE != write(dev_fd, addr, BLOCK_SIZE)) { 461 printf("%s: bad block in file '%s'\n", 462 bb_msg_write_error, current_name); 463 errors_uncorrected = 1; 464 } 465} 466 467/* 468 * map_block calculates the absolute block nr of a block in a file. 469 * It sets 'changed' if the inode has needed changing, and re-writes 470 * any indirect blocks with errors. 471 */ 472static int map_block(struct minix1_inode *inode, unsigned blknr) 473{ 474 uint16_t ind[BLOCK_SIZE >> 1]; 475 uint16_t dind[BLOCK_SIZE >> 1]; 476 int block, result; 477 smallint blk_chg; 478 479 if (blknr < 7) 480 return check_zone_nr(inode->i_zone + blknr, &changed); 481 blknr -= 7; 482 if (blknr < 512) { 483 block = check_zone_nr(inode->i_zone + 7, &changed); 484 read_block(block, (char *) ind); 485 blk_chg = 0; 486 result = check_zone_nr(blknr + ind, &blk_chg); 487 if (blk_chg) 488 write_block(block, (char *) ind); 489 return result; 490 } 491 blknr -= 512; 492 block = check_zone_nr(inode->i_zone + 8, &changed); 493 read_block(block, (char *) dind); 494 blk_chg = 0; 495 result = check_zone_nr(dind + (blknr / 512), &blk_chg); 496 if (blk_chg) 497 write_block(block, (char *) dind); 498 block = result; 499 read_block(block, (char *) ind); 500 blk_chg = 0; 501 result = check_zone_nr(ind + (blknr % 512), &blk_chg); 502 if (blk_chg) 503 write_block(block, (char *) ind); 504 return result; 505} 506 507#if ENABLE_FEATURE_MINIX2 508static int map_block2(struct minix2_inode *inode, unsigned blknr) 509{ 510 uint32_t ind[BLOCK_SIZE >> 2]; 511 uint32_t dind[BLOCK_SIZE >> 2]; 512 uint32_t tind[BLOCK_SIZE >> 2]; 513 int block, result; 514 smallint blk_chg; 515 516 if (blknr < 7) 517 return check_zone_nr2(inode->i_zone + blknr, &changed); 518 blknr -= 7; 519 if (blknr < 256) { 520 block = check_zone_nr2(inode->i_zone + 7, &changed); 521 read_block(block, (char *) ind); 522 blk_chg = 0; 523 result = check_zone_nr2(blknr + ind, &blk_chg); 524 if (blk_chg) 525 write_block(block, (char *) ind); 526 return result; 527 } 528 blknr -= 256; 529 if (blknr >= 256 * 256) { 530 block = check_zone_nr2(inode->i_zone + 8, &changed); 531 read_block(block, (char *) dind); 532 blk_chg = 0; 533 result = check_zone_nr2(dind + blknr / 256, &blk_chg); 534 if (blk_chg) 535 write_block(block, (char *) dind); 536 block = result; 537 read_block(block, (char *) ind); 538 blk_chg = 0; 539 result = check_zone_nr2(ind + blknr % 256, &blk_chg); 540 if (blk_chg) 541 write_block(block, (char *) ind); 542 return result; 543 } 544 blknr -= 256 * 256; 545 block = check_zone_nr2(inode->i_zone + 9, &changed); 546 read_block(block, (char *) tind); 547 blk_chg = 0; 548 result = check_zone_nr2(tind + blknr / (256 * 256), &blk_chg); 549 if (blk_chg) 550 write_block(block, (char *) tind); 551 block = result; 552 read_block(block, (char *) dind); 553 blk_chg = 0; 554 result = check_zone_nr2(dind + (blknr / 256) % 256, &blk_chg); 555 if (blk_chg) 556 write_block(block, (char *) dind); 557 block = result; 558 read_block(block, (char *) ind); 559 blk_chg = 0; 560 result = check_zone_nr2(ind + blknr % 256, &blk_chg); 561 if (blk_chg) 562 write_block(block, (char *) ind); 563 return result; 564} 565#endif 566 567static void write_super_block(void) 568{ 569 /* 570 * Set the state of the filesystem based on whether or not there 571 * are uncorrected errors. The filesystem valid flag is 572 * unconditionally set if we get this far. 573 */ 574 Super.s_state |= MINIX_VALID_FS | MINIX_ERROR_FS; 575 if (!errors_uncorrected) 576 Super.s_state &= ~MINIX_ERROR_FS; 577 578 if (BLOCK_SIZE != lseek(dev_fd, BLOCK_SIZE, SEEK_SET)) 579 die("seek failed in write_super_block"); 580 if (BLOCK_SIZE != write(dev_fd, super_block_buffer, BLOCK_SIZE)) 581 die("cannot write super-block"); 582} 583 584static void write_tables(void) 585{ 586 write_super_block(); 587 588 if (IMAPS * BLOCK_SIZE != write(dev_fd, inode_map, IMAPS * BLOCK_SIZE)) 589 die("cannot write inode map"); 590 if (ZMAPS * BLOCK_SIZE != write(dev_fd, zone_map, ZMAPS * BLOCK_SIZE)) 591 die("cannot write zone map"); 592 if (INODE_BUFFER_SIZE != write(dev_fd, inode_buffer, INODE_BUFFER_SIZE)) 593 die("cannot write inodes"); 594} 595 596static void get_dirsize(void) 597{ 598 int block; 599 char blk[BLOCK_SIZE]; 600 int size; 601 602#if ENABLE_FEATURE_MINIX2 603 if (version2) 604 block = Inode2[MINIX_ROOT_INO].i_zone[0]; 605 else 606#endif 607 block = Inode1[MINIX_ROOT_INO].i_zone[0]; 608 read_block(block, blk); 609 for (size = 16; size < BLOCK_SIZE; size <<= 1) { 610 if (strcmp(blk + size + 2, "..") == 0) { 611 dirsize = size; 612 namelen = size - 2; 613 return; 614 } 615 } 616 /* use defaults */ 617} 618 619static void read_superblock(void) 620{ 621 if (BLOCK_SIZE != lseek(dev_fd, BLOCK_SIZE, SEEK_SET)) 622 die("seek failed"); 623 if (BLOCK_SIZE != read(dev_fd, super_block_buffer, BLOCK_SIZE)) 624 die("cannot read super block"); 625 /* already initialized to: 626 namelen = 14; 627 dirsize = 16; 628 version2 = 0; 629 */ 630 if (MAGIC == MINIX1_SUPER_MAGIC) { 631 } else if (MAGIC == MINIX1_SUPER_MAGIC2) { 632 namelen = 30; 633 dirsize = 32; 634#if ENABLE_FEATURE_MINIX2 635 } else if (MAGIC == MINIX2_SUPER_MAGIC) { 636 version2 = 1; 637 } else if (MAGIC == MINIX2_SUPER_MAGIC2) { 638 namelen = 30; 639 dirsize = 32; 640 version2 = 1; 641#endif 642 } else 643 die("bad magic number in super-block"); 644 if (ZONESIZE != 0 || BLOCK_SIZE != 1024) 645 die("only 1k blocks/zones supported"); 646 if (IMAPS * BLOCK_SIZE * 8 < INODES + 1) 647 die("bad s_imap_blocks field in super-block"); 648 if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1) 649 die("bad s_zmap_blocks field in super-block"); 650} 651 652static void read_tables(void) 653{ 654 inode_map = xzalloc(IMAPS * BLOCK_SIZE); 655 zone_map = xzalloc(ZMAPS * BLOCK_SIZE); 656 inode_buffer = xmalloc(INODE_BUFFER_SIZE); 657 inode_count = xmalloc(INODES + 1); 658 zone_count = xmalloc(ZONES); 659 if (IMAPS * BLOCK_SIZE != read(dev_fd, inode_map, IMAPS * BLOCK_SIZE)) 660 die("cannot read inode map"); 661 if (ZMAPS * BLOCK_SIZE != read(dev_fd, zone_map, ZMAPS * BLOCK_SIZE)) 662 die("cannot read zone map"); 663 if (INODE_BUFFER_SIZE != read(dev_fd, inode_buffer, INODE_BUFFER_SIZE)) 664 die("cannot read inodes"); 665 if (NORM_FIRSTZONE != FIRSTZONE) { 666 printf("warning: firstzone!=norm_firstzone\n"); 667 errors_uncorrected = 1; 668 } 669 get_dirsize(); 670 if (show) { 671 printf("%u inodes\n" 672 "%u blocks\n" 673 "Firstdatazone=%u (%u)\n" 674 "Zonesize=%u\n" 675 "Maxsize=%u\n" 676 "Filesystem state=%u\n" 677 "namelen=%u\n\n", 678 INODES, 679 ZONES, 680 FIRSTZONE, NORM_FIRSTZONE, 681 BLOCK_SIZE << ZONESIZE, 682 MAXSIZE, 683 Super.s_state, 684 namelen); 685 } 686} 687 688static struct minix1_inode *get_inode(unsigned nr) 689{ 690 struct minix1_inode *inode; 691 692 if (!nr || nr > INODES) 693 return NULL; 694 total++; 695 inode = Inode1 + nr; 696 if (!inode_count[nr]) { 697 if (!inode_in_use(nr)) { 698 printf("Inode %d is marked as 'unused', but it is used " 699 "for file '%s'\n", nr, current_name); 700 if (repair) { 701 if (ask("Mark as 'in use'", 1)) 702 mark_inode(nr); 703 else 704 errors_uncorrected = 1; 705 } 706 } 707 if (S_ISDIR(inode->i_mode)) 708 directory++; 709 else if (S_ISREG(inode->i_mode)) 710 regular++; 711 else if (S_ISCHR(inode->i_mode)) 712 chardev++; 713 else if (S_ISBLK(inode->i_mode)) 714 blockdev++; 715 else if (S_ISLNK(inode->i_mode)) 716 symlinks++; 717 else if (S_ISSOCK(inode->i_mode)); 718 else if (S_ISFIFO(inode->i_mode)); 719 else { 720 printf("%s has mode %05o\n", current_name, inode->i_mode); 721 } 722 723 } else 724 links++; 725 if (!++inode_count[nr]) { 726 printf("Warning: inode count too big\n"); 727 inode_count[nr]--; 728 errors_uncorrected = 1; 729 } 730 return inode; 731} 732 733#if ENABLE_FEATURE_MINIX2 734static struct minix2_inode *get_inode2(unsigned nr) 735{ 736 struct minix2_inode *inode; 737 738 if (!nr || nr > INODES) 739 return NULL; 740 total++; 741 inode = Inode2 + nr; 742 if (!inode_count[nr]) { 743 if (!inode_in_use(nr)) { 744 printf("Inode %d is marked as 'unused', but it is used " 745 "for file '%s'\n", nr, current_name); 746 if (repair) { 747 if (ask("Mark as 'in use'", 1)) 748 mark_inode(nr); 749 else 750 errors_uncorrected = 1; 751 } 752 } 753 if (S_ISDIR(inode->i_mode)) 754 directory++; 755 else if (S_ISREG(inode->i_mode)) 756 regular++; 757 else if (S_ISCHR(inode->i_mode)) 758 chardev++; 759 else if (S_ISBLK(inode->i_mode)) 760 blockdev++; 761 else if (S_ISLNK(inode->i_mode)) 762 symlinks++; 763 else if (S_ISSOCK(inode->i_mode)); 764 else if (S_ISFIFO(inode->i_mode)); 765 else { 766 printf("%s has mode %05o\n", current_name, inode->i_mode); 767 } 768 } else 769 links++; 770 if (!++inode_count[nr]) { 771 printf("Warning: inode count too big\n"); 772 inode_count[nr]--; 773 errors_uncorrected = 1; 774 } 775 return inode; 776} 777#endif 778 779static void check_root(void) 780{ 781 struct minix1_inode *inode = Inode1 + MINIX_ROOT_INO; 782 783 if (!inode || !S_ISDIR(inode->i_mode)) 784 die("root inode isn't a directory"); 785} 786 787#if ENABLE_FEATURE_MINIX2 788static void check_root2(void) 789{ 790 struct minix2_inode *inode = Inode2 + MINIX_ROOT_INO; 791 792 if (!inode || !S_ISDIR(inode->i_mode)) 793 die("root inode isn't a directory"); 794} 795#else 796void check_root2(void); 797#endif 798 799static int add_zone(uint16_t *znr, smallint *corrected) 800{ 801 int result; 802 int block; 803 804 result = 0; 805 block = check_zone_nr(znr, corrected); 806 if (!block) 807 return 0; 808 if (zone_count[block]) { 809 printf("Already used block is reused in file '%s'. ", 810 current_name); 811 if (ask("Clear", 1)) { 812 *znr = 0; 813 block = 0; 814 *corrected = 1; 815 return 0; 816 } 817 } 818 if (!zone_in_use(block)) { 819 printf("Block %d in file '%s' is marked as 'unused'. ", 820 block, current_name); 821 if (ask("Correct", 1)) 822 mark_zone(block); 823 } 824 if (!++zone_count[block]) 825 zone_count[block]--; 826 return block; 827} 828 829#if ENABLE_FEATURE_MINIX2 830static int add_zone2(uint32_t *znr, smallint *corrected) 831{ 832 int result; 833 int block; 834 835 result = 0; 836 block = check_zone_nr2(znr, corrected); 837 if (!block) 838 return 0; 839 if (zone_count[block]) { 840 printf("Already used block is reused in file '%s'. ", 841 current_name); 842 if (ask("Clear", 1)) { 843 *znr = 0; 844 block = 0; 845 *corrected = 1; 846 return 0; 847 } 848 } 849 if (!zone_in_use(block)) { 850 printf("Block %d in file '%s' is marked as 'unused'. ", 851 block, current_name); 852 if (ask("Correct", 1)) 853 mark_zone(block); 854 } 855 if (!++zone_count[block]) 856 zone_count[block]--; 857 return block; 858} 859#endif 860 861static void add_zone_ind(uint16_t *znr, smallint *corrected) 862{ 863 int i; 864 int block; 865 smallint chg_blk = 0; 866 867 block = add_zone(znr, corrected); 868 if (!block) 869 return; 870 read_block(block, add_zone_ind_blk); 871 for (i = 0; i < (BLOCK_SIZE >> 1); i++) 872 add_zone(i + (uint16_t *) add_zone_ind_blk, &chg_blk); 873 if (chg_blk) 874 write_block(block, add_zone_ind_blk); 875} 876 877#if ENABLE_FEATURE_MINIX2 878static void add_zone_ind2(uint32_t *znr, smallint *corrected) 879{ 880 int i; 881 int block; 882 smallint chg_blk = 0; 883 884 block = add_zone2(znr, corrected); 885 if (!block) 886 return; 887 read_block(block, add_zone_ind_blk); 888 for (i = 0; i < BLOCK_SIZE >> 2; i++) 889 add_zone2(i + (uint32_t *) add_zone_ind_blk, &chg_blk); 890 if (chg_blk) 891 write_block(block, add_zone_ind_blk); 892} 893#endif 894 895static void add_zone_dind(uint16_t *znr, smallint *corrected) 896{ 897 int i; 898 int block; 899 smallint chg_blk = 0; 900 901 block = add_zone(znr, corrected); 902 if (!block) 903 return; 904 read_block(block, add_zone_dind_blk); 905 for (i = 0; i < (BLOCK_SIZE >> 1); i++) 906 add_zone_ind(i + (uint16_t *) add_zone_dind_blk, &chg_blk); 907 if (chg_blk) 908 write_block(block, add_zone_dind_blk); 909} 910 911#if ENABLE_FEATURE_MINIX2 912static void add_zone_dind2(uint32_t *znr, smallint *corrected) 913{ 914 int i; 915 int block; 916 smallint chg_blk = 0; 917 918 block = add_zone2(znr, corrected); 919 if (!block) 920 return; 921 read_block(block, add_zone_dind_blk); 922 for (i = 0; i < BLOCK_SIZE >> 2; i++) 923 add_zone_ind2(i + (uint32_t *) add_zone_dind_blk, &chg_blk); 924 if (chg_blk) 925 write_block(block, add_zone_dind_blk); 926} 927 928static void add_zone_tind2(uint32_t *znr, smallint *corrected) 929{ 930 int i; 931 int block; 932 smallint chg_blk = 0; 933 934 block = add_zone2(znr, corrected); 935 if (!block) 936 return; 937 read_block(block, add_zone_tind_blk); 938 for (i = 0; i < BLOCK_SIZE >> 2; i++) 939 add_zone_dind2(i + (uint32_t *) add_zone_tind_blk, &chg_blk); 940 if (chg_blk) 941 write_block(block, add_zone_tind_blk); 942} 943#endif 944 945static void check_zones(unsigned i) 946{ 947 struct minix1_inode *inode; 948 949 if (!i || i > INODES) 950 return; 951 if (inode_count[i] > 1) /* have we counted this file already? */ 952 return; 953 inode = Inode1 + i; 954 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) && 955 !S_ISLNK(inode->i_mode)) return; 956 for (i = 0; i < 7; i++) 957 add_zone(i + inode->i_zone, &changed); 958 add_zone_ind(7 + inode->i_zone, &changed); 959 add_zone_dind(8 + inode->i_zone, &changed); 960} 961 962#if ENABLE_FEATURE_MINIX2 963static void check_zones2(unsigned i) 964{ 965 struct minix2_inode *inode; 966 967 if (!i || i > INODES) 968 return; 969 if (inode_count[i] > 1) /* have we counted this file already? */ 970 return; 971 inode = Inode2 + i; 972 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) 973 && !S_ISLNK(inode->i_mode)) 974 return; 975 for (i = 0; i < 7; i++) 976 add_zone2(i + inode->i_zone, &changed); 977 add_zone_ind2(7 + inode->i_zone, &changed); 978 add_zone_dind2(8 + inode->i_zone, &changed); 979 add_zone_tind2(9 + inode->i_zone, &changed); 980} 981#endif 982 983static void check_file(struct minix1_inode *dir, unsigned offset) 984{ 985 struct minix1_inode *inode; 986 int ino; 987 char *name; 988 int block; 989 990 block = map_block(dir, offset / BLOCK_SIZE); 991 read_block(block, check_file_blk); 992 name = check_file_blk + (offset % BLOCK_SIZE) + 2; 993 ino = *(uint16_t *) (name - 2); 994 if (ino > INODES) { 995 printf("%s contains a bad inode number for file '%.*s'. ", 996 current_name, namelen, name); 997 if (ask("Remove", 1)) { 998 *(uint16_t *) (name - 2) = 0; 999 write_block(block, check_file_blk); 1000 } 1001 ino = 0; 1002 } 1003 push_filename(name); 1004 inode = get_inode(ino); 1005 pop_filename(); 1006 if (!offset) { 1007 if (inode && LONE_CHAR(name, '.')) 1008 return; 1009 printf("%s: bad directory: '.' isn't first\n", current_name); 1010 errors_uncorrected = 1; 1011 } 1012 if (offset == dirsize) { 1013 if (inode && strcmp("..", name) == 0) 1014 return; 1015 printf("%s: bad directory: '..' isn't second\n", current_name); 1016 errors_uncorrected = 1; 1017 } 1018 if (!inode) 1019 return; 1020 push_filename(name); 1021 if (list) { 1022 if (verbose) 1023 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks); 1024 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : ""); 1025 } 1026 check_zones(ino); 1027 if (inode && S_ISDIR(inode->i_mode)) 1028 recursive_check(ino); 1029 pop_filename(); 1030} 1031 1032#if ENABLE_FEATURE_MINIX2 1033static void check_file2(struct minix2_inode *dir, unsigned offset) 1034{ 1035 struct minix2_inode *inode; 1036 int ino; 1037 char *name; 1038 int block; 1039 1040 block = map_block2(dir, offset / BLOCK_SIZE); 1041 read_block(block, check_file_blk); 1042 name = check_file_blk + (offset % BLOCK_SIZE) + 2; 1043 ino = *(uint16_t *) (name - 2); 1044 if (ino > INODES) { 1045 printf("%s contains a bad inode number for file '%.*s'. ", 1046 current_name, namelen, name); 1047 if (ask("Remove", 1)) { 1048 *(uint16_t *) (name - 2) = 0; 1049 write_block(block, check_file_blk); 1050 } 1051 ino = 0; 1052 } 1053 push_filename(name); 1054 inode = get_inode2(ino); 1055 pop_filename(); 1056 if (!offset) { 1057 if (inode && LONE_CHAR(name, '.')) 1058 return; 1059 printf("%s: bad directory: '.' isn't first\n", current_name); 1060 errors_uncorrected = 1; 1061 } 1062 if (offset == dirsize) { 1063 if (inode && strcmp("..", name) == 0) 1064 return; 1065 printf("%s: bad directory: '..' isn't second\n", current_name); 1066 errors_uncorrected = 1; 1067 } 1068 if (!inode) 1069 return; 1070 push_filename(name); 1071 if (list) { 1072 if (verbose) 1073 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks); 1074 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : ""); 1075 } 1076 check_zones2(ino); 1077 if (inode && S_ISDIR(inode->i_mode)) 1078 recursive_check2(ino); 1079 pop_filename(); 1080} 1081#endif 1082 1083static void recursive_check(unsigned ino) 1084{ 1085 struct minix1_inode *dir; 1086 unsigned offset; 1087 1088 dir = Inode1 + ino; 1089 if (!S_ISDIR(dir->i_mode)) 1090 die("internal error"); 1091 if (dir->i_size < 2 * dirsize) { 1092 printf("%s: bad directory: size<32", current_name); 1093 errors_uncorrected = 1; 1094 } 1095 for (offset = 0; offset < dir->i_size; offset += dirsize) 1096 check_file(dir, offset); 1097} 1098 1099#if ENABLE_FEATURE_MINIX2 1100static void recursive_check2(unsigned ino) 1101{ 1102 struct minix2_inode *dir; 1103 unsigned offset; 1104 1105 dir = Inode2 + ino; 1106 if (!S_ISDIR(dir->i_mode)) 1107 die("internal error"); 1108 if (dir->i_size < 2 * dirsize) { 1109 printf("%s: bad directory: size<32", current_name); 1110 errors_uncorrected = 1; 1111 } 1112 for (offset = 0; offset < dir->i_size; offset += dirsize) 1113 check_file2(dir, offset); 1114} 1115#endif 1116 1117static int bad_zone(int i) 1118{ 1119 char buffer[BLOCK_SIZE]; 1120 1121 if (BLOCK_SIZE * i != lseek(dev_fd, BLOCK_SIZE * i, SEEK_SET)) 1122 die("seek failed in bad_zone"); 1123 return (BLOCK_SIZE != read(dev_fd, buffer, BLOCK_SIZE)); 1124} 1125 1126static void check_counts(void) 1127{ 1128 int i; 1129 1130 for (i = 1; i <= INODES; i++) { 1131 if (warn_mode && Inode1[i].i_mode && !inode_in_use(i)) { 1132 printf("Inode %d has non-zero mode. ", i); 1133 if (ask("Clear", 1)) { 1134 Inode1[i].i_mode = 0; 1135 changed = 1; 1136 } 1137 } 1138 if (!inode_count[i]) { 1139 if (!inode_in_use(i)) 1140 continue; 1141 printf("Unused inode %d is marked as 'used' in the bitmap. ", i); 1142 if (ask("Clear", 1)) 1143 unmark_inode(i); 1144 continue; 1145 } 1146 if (!inode_in_use(i)) { 1147 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i); 1148 if (ask("Set", 1)) 1149 mark_inode(i); 1150 } 1151 if (Inode1[i].i_nlinks != inode_count[i]) { 1152 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ", 1153 i, Inode1[i].i_mode, Inode1[i].i_nlinks, 1154 inode_count[i]); 1155 if (ask("Set i_nlinks to count", 1)) { 1156 Inode1[i].i_nlinks = inode_count[i]; 1157 changed = 1; 1158 } 1159 } 1160 } 1161 for (i = FIRSTZONE; i < ZONES; i++) { 1162 if ((zone_in_use(i) != 0) == zone_count[i]) 1163 continue; 1164 if (!zone_count[i]) { 1165 if (bad_zone(i)) 1166 continue; 1167 printf("Zone %d is marked 'in use', but no file uses it. ", i); 1168 if (ask("Unmark", 1)) 1169 unmark_zone(i); 1170 continue; 1171 } 1172 printf("Zone %d: %sin use, counted=%d\n", 1173 i, zone_in_use(i) ? "" : "not ", zone_count[i]); 1174 } 1175} 1176 1177#if ENABLE_FEATURE_MINIX2 1178static void check_counts2(void) 1179{ 1180 int i; 1181 1182 for (i = 1; i <= INODES; i++) { 1183 if (warn_mode && Inode2[i].i_mode && !inode_in_use(i)) { 1184 printf("Inode %d has non-zero mode. ", i); 1185 if (ask("Clear", 1)) { 1186 Inode2[i].i_mode = 0; 1187 changed = 1; 1188 } 1189 } 1190 if (!inode_count[i]) { 1191 if (!inode_in_use(i)) 1192 continue; 1193 printf("Unused inode %d is marked as 'used' in the bitmap. ", i); 1194 if (ask("Clear", 1)) 1195 unmark_inode(i); 1196 continue; 1197 } 1198 if (!inode_in_use(i)) { 1199 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i); 1200 if (ask("Set", 1)) 1201 mark_inode(i); 1202 } 1203 if (Inode2[i].i_nlinks != inode_count[i]) { 1204 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ", 1205 i, Inode2[i].i_mode, Inode2[i].i_nlinks, 1206 inode_count[i]); 1207 if (ask("Set i_nlinks to count", 1)) { 1208 Inode2[i].i_nlinks = inode_count[i]; 1209 changed = 1; 1210 } 1211 } 1212 } 1213 for (i = FIRSTZONE; i < ZONES; i++) { 1214 if ((zone_in_use(i) != 0) == zone_count[i]) 1215 continue; 1216 if (!zone_count[i]) { 1217 if (bad_zone(i)) 1218 continue; 1219 printf("Zone %d is marked 'in use', but no file uses it. ", i); 1220 if (ask("Unmark", 1)) 1221 unmark_zone(i); 1222 continue; 1223 } 1224 printf("Zone %d: %sin use, counted=%d\n", 1225 i, zone_in_use(i) ? "" : "not ", zone_count[i]); 1226 } 1227} 1228#endif 1229 1230static void check(void) 1231{ 1232 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count)); 1233 memset(zone_count, 0, ZONES * sizeof(*zone_count)); 1234 check_zones(MINIX_ROOT_INO); 1235 recursive_check(MINIX_ROOT_INO); 1236 check_counts(); 1237} 1238 1239#if ENABLE_FEATURE_MINIX2 1240static void check2(void) 1241{ 1242 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count)); 1243 memset(zone_count, 0, ZONES * sizeof(*zone_count)); 1244 check_zones2(MINIX_ROOT_INO); 1245 recursive_check2(MINIX_ROOT_INO); 1246 check_counts2(); 1247} 1248#else 1249void check2(void); 1250#endif 1251 1252int fsck_minix_main(int argc, char **argv); 1253int fsck_minix_main(int argc, char **argv) 1254{ 1255 struct termios tmp; 1256 int retcode = 0; 1257 1258 xfunc_error_retval = 8; 1259 1260 INIT_G(); 1261 1262 if (INODE_SIZE1 * MINIX1_INODES_PER_BLOCK != BLOCK_SIZE) 1263 die("bad inode size"); 1264#if ENABLE_FEATURE_MINIX2 1265 if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE) 1266 die("bad v2 inode size"); 1267#endif 1268 while (--argc != 0) { 1269 argv++; 1270 if (argv[0][0] != '-') { 1271 if (device_name) 1272 bb_show_usage(); 1273 device_name = argv[0]; 1274 } else { 1275 while (*++argv[0]) { 1276 switch (argv[0][0]) { 1277 case 'l': 1278 list = 1; 1279 break; 1280 case 'a': 1281 automatic = 1; 1282 repair = 1; 1283 break; 1284 case 'r': 1285 automatic = 0; 1286 repair = 1; 1287 break; 1288 case 'v': 1289 verbose = 1; 1290 break; 1291 case 's': 1292 show = 1; 1293 break; 1294 case 'm': 1295 warn_mode = 1; 1296 break; 1297 case 'f': 1298 force = 1; 1299 break; 1300 default: 1301 bb_show_usage(); 1302 } 1303 } 1304 } 1305 } 1306 if (!device_name) 1307 bb_show_usage(); 1308 1309 check_mount(); /* trying to check a mounted filesystem? */ 1310 if (repair && !automatic) { 1311 if (!isatty(0) || !isatty(1)) 1312 die("need terminal for interactive repairs"); 1313 } 1314 dev_fd = xopen(device_name, repair ? O_RDWR : O_RDONLY); 1315 1316 /*sync(); paranoia? */ 1317 read_superblock(); 1318 1319 /* 1320 * Determine whether or not we should continue with the checking. 1321 * This is based on the status of the filesystem valid and error 1322 * flags and whether or not the -f switch was specified on the 1323 * command line. 1324 */ 1325 printf("%s: %s\n", applet_name, bb_banner); 1326 1327 if (!(Super.s_state & MINIX_ERROR_FS) 1328 && (Super.s_state & MINIX_VALID_FS) && !force 1329 ) { 1330 if (repair) 1331 printf("%s is clean, check is skipped\n", device_name); 1332 return 0; 1333 } else if (force) 1334 printf("Forcing filesystem check on %s\n", device_name); 1335 else if (repair) 1336 printf("Filesystem on %s is dirty, needs checking\n", 1337 device_name); 1338 1339 read_tables(); 1340 1341 if (repair && !automatic) { 1342 tcgetattr(0, &sv_termios); 1343 tmp = sv_termios; 1344 tmp.c_lflag &= ~(ICANON | ECHO); 1345 tcsetattr(0, TCSANOW, &tmp); 1346 termios_set = 1; 1347 } 1348 1349 if (version2) { 1350 check_root2(); 1351 check2(); 1352 } else { 1353 check_root(); 1354 check(); 1355 } 1356 1357 if (verbose) { 1358 int i, free_cnt; 1359 1360 for (i = 1, free_cnt = 0; i <= INODES; i++) 1361 if (!inode_in_use(i)) 1362 free_cnt++; 1363 printf("\n%6u inodes used (%u%%)\n", (INODES - free_cnt), 1364 100 * (INODES - free_cnt) / INODES); 1365 for (i = FIRSTZONE, free_cnt = 0; i < ZONES; i++) 1366 if (!zone_in_use(i)) 1367 free_cnt++; 1368 printf("%6u zones used (%u%%)\n\n" 1369 "%6u regular files\n" 1370 "%6u directories\n" 1371 "%6u character device files\n" 1372 "%6u block device files\n" 1373 "%6u links\n" 1374 "%6u symbolic links\n" 1375 "------\n" 1376 "%6u files\n", 1377 (ZONES - free_cnt), 100 * (ZONES - free_cnt) / ZONES, 1378 regular, directory, chardev, blockdev, 1379 links - 2 * directory + 1, symlinks, 1380 total - 2 * directory + 1); 1381 } 1382 if (changed) { 1383 write_tables(); 1384 printf("FILE SYSTEM HAS BEEN CHANGED\n"); 1385 sync(); 1386 } else if (repair) 1387 write_super_block(); 1388 1389 if (repair && !automatic) 1390 tcsetattr(0, TCSANOW, &sv_termios); 1391 1392 if (changed) 1393 retcode += 3; 1394 if (errors_uncorrected) 1395 retcode += 4; 1396 return retcode; 1397} 1398