source: MondoRescue/trunk/mindi-busybox/util-linux/fsck_minix.c@ 956

Last change on this file since 956 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 34.4 KB
Line 
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. This file may be redistributed
6 * as per the GNU copyleft.
7 */
8
9/*
10 * 09.11.91 - made the first rudimentary functions
11 *
12 * 10.11.91 - updated, does checking, no repairs yet.
13 * Sent out to the mailing-list for testing.
14 *
15 * 14.11.91 - Testing seems to have gone well. Added some
16 * correction-code, and changed some functions.
17 *
18 * 15.11.91 - More correction code. Hopefully it notices most
19 * cases now, and tries to do something about them.
20 *
21 * 16.11.91 - More corrections (thanks to Mika Jalava). Most
22 * things seem to work now. Yeah, sure.
23 *
24 *
25 * 19.04.92 - Had to start over again from this old version, as a
26 * kernel bug ate my enhanced fsck in february.
27 *
28 * 28.02.93 - added support for different directory entry sizes..
29 *
30 * Sat Mar 6 18:59:42 1993, faith@cs.unc.edu: Output namelen with
31 * super-block information
32 *
33 * Sat Oct 9 11:17:11 1993, faith@cs.unc.edu: make exit status conform
34 * to that required by fsutil
35 *
36 * Mon Jan 3 11:06:52 1994 - Dr. Wettstein (greg%wind.uucp@plains.nodak.edu)
37 * Added support for file system valid flag. Also
38 * added program_version variable and output of
39 * program name and version number when program
40 * is executed.
41 *
42 * 30.10.94 - added support for v2 filesystem
43 * (Andreas Schwab, schwab@issan.informatik.uni-dortmund.de)
44 *
45 * 10.12.94 - added test to prevent checking of mounted fs adapted
46 * from Theodore Ts'o's (tytso@athena.mit.edu) e2fsck
47 * program. (Daniel Quinlan, quinlan@yggdrasil.com)
48 *
49 * 01.07.96 - Fixed the v2 fs stuff to use the right #defines and such
50 * for modern libcs (janl@math.uio.no, Nicolai Langfeldt)
51 *
52 * 02.07.96 - Added C bit fiddling routines from rmk@ecs.soton.ac.uk
53 * (Russell King). He made them for ARM. It would seem
54 * that the ARM is powerful enough to do this in C whereas
55 * i386 and m64k must use assembly to get it fast >:-)
56 * This should make minix fsck system-independent.
57 * (janl@math.uio.no, Nicolai Langfeldt)
58 *
59 * 04.11.96 - Added minor fixes from Andreas Schwab to avoid compiler
60 * warnings. Added mc68k bitops from
61 * Joerg Dorchain <dorchain@mpi-sb.mpg.de>.
62 *
63 * 06.11.96 - Added v2 code submitted by Joerg Dorchain, but written by
64 * Andreas Schwab.
65 *
66 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
67 * - added Native Language Support
68 *
69 *
70 * I've had no time to add comments - hopefully the function names
71 * are comments enough. As with all file system checkers, this assumes
72 * the file system is quiescent - don't use it on a mounted device
73 * unless you can be sure nobody is writing to it (and remember that the
74 * kernel can write to it when it searches for files).
75 *
76 * Usage: fsck [-larvsm] device
77 * -l for a listing of all the filenames
78 * -a for automatic repairs (not implemented)
79 * -r for repairs (interactive) (not implemented)
80 * -v for verbose (tells how many files)
81 * -s for super-block info
82 * -m for minix-like "mode not cleared" warnings
83 * -f force filesystem check even if filesystem marked as valid
84 *
85 * The device may be a block device or a image of one, but this isn't
86 * enforced (but it's not much fun on a character device :-).
87 */
88
89#include <stdio.h>
90#include <errno.h>
91#include <unistd.h>
92#include <string.h>
93#include <fcntl.h>
94#include <ctype.h>
95#include <stdlib.h>
96#include <termios.h>
97#include <mntent.h>
98#include <sys/param.h>
99#include "busybox.h"
100
101/*
102 * This is the original minix inode layout on disk.
103 * Note the 8-bit gid and atime and ctime.
104 */
105struct minix_inode {
106 uint16_t i_mode;
107 uint16_t i_uid;
108 uint32_t i_size;
109 uint32_t i_time;
110 uint8_t i_gid;
111 uint8_t i_nlinks;
112 uint16_t i_zone[9];
113};
114
115/*
116 * The new minix inode has all the time entries, as well as
117 * long block numbers and a third indirect block (7+1+1+1
118 * instead of 7+1+1). Also, some previously 8-bit values are
119 * now 16-bit. The inode is now 64 bytes instead of 32.
120 */
121struct minix2_inode {
122 uint16_t i_mode;
123 uint16_t i_nlinks;
124 uint16_t i_uid;
125 uint16_t i_gid;
126 uint32_t i_size;
127 uint32_t i_atime;
128 uint32_t i_mtime;
129 uint32_t i_ctime;
130 uint32_t i_zone[10];
131};
132
133enum {
134 MINIX_ROOT_INO = 1,
135 MINIX_LINK_MAX = 250,
136 MINIX2_LINK_MAX = 65530,
137
138 MINIX_I_MAP_SLOTS = 8,
139 MINIX_Z_MAP_SLOTS = 64,
140 MINIX_SUPER_MAGIC = 0x137F, /* original minix fs */
141 MINIX_SUPER_MAGIC2 = 0x138F, /* minix fs, 30 char names */
142 MINIX2_SUPER_MAGIC = 0x2468, /* minix V2 fs */
143 MINIX2_SUPER_MAGIC2 = 0x2478, /* minix V2 fs, 30 char names */
144 MINIX_VALID_FS = 0x0001, /* Clean fs. */
145 MINIX_ERROR_FS = 0x0002, /* fs has errors. */
146
147 MINIX_INODES_PER_BLOCK = ((BLOCK_SIZE)/(sizeof (struct minix_inode))),
148 MINIX2_INODES_PER_BLOCK = ((BLOCK_SIZE)/(sizeof (struct minix2_inode))),
149
150 MINIX_V1 = 0x0001, /* original minix fs */
151 MINIX_V2 = 0x0002 /* minix V2 fs */
152};
153
154#define INODE_VERSION(inode) inode->i_sb->u.minix_sb.s_version
155
156/*
157 * minix super-block data on disk
158 */
159struct minix_super_block {
160 uint16_t s_ninodes;
161 uint16_t s_nzones;
162 uint16_t s_imap_blocks;
163 uint16_t s_zmap_blocks;
164 uint16_t s_firstdatazone;
165 uint16_t s_log_zone_size;
166 uint32_t s_max_size;
167 uint16_t s_magic;
168 uint16_t s_state;
169 uint32_t s_zones;
170};
171
172struct minix_dir_entry {
173 uint16_t inode;
174 char name[0];
175};
176
177
178#define NAME_MAX 255 /* # chars in a file name */
179
180#define MINIX_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix_inode)))
181
182#ifndef BLKGETSIZE
183#define BLKGETSIZE _IO(0x12,96) /* return device size */
184#endif
185
186#ifndef __linux__
187#define volatile
188#endif
189
190enum { ROOT_INO = 1 };
191
192#define UPPER(size,n) ((size+((n)-1))/(n))
193#define INODE_SIZE (sizeof(struct minix_inode))
194#ifdef CONFIG_FEATURE_MINIX2
195#define INODE_SIZE2 (sizeof(struct minix2_inode))
196#define INODE_BLOCKS UPPER(INODES, (version2 ? MINIX2_INODES_PER_BLOCK \
197 : MINIX_INODES_PER_BLOCK))
198#else
199#define INODE_BLOCKS UPPER(INODES, (MINIX_INODES_PER_BLOCK))
200#endif
201#define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE)
202
203#define BITS_PER_BLOCK (BLOCK_SIZE<<3)
204
205static char *program_version = "1.2 - 11/11/96";
206static char *device_name;
207static int IN;
208static int repair, automatic, verbose, list, show, warn_mode, force;
209static int directory, regular, blockdev, chardev, links, symlinks, total;
210
211static int changed; /* flags if the filesystem has been changed */
212static int errors_uncorrected; /* flag if some error was not corrected */
213static int dirsize = 16;
214static int namelen = 14;
215static struct termios termios;
216static int termios_set;
217
218static char *inode_buffer;
219#define Inode (((struct minix_inode *) inode_buffer)-1)
220#define Inode2 (((struct minix2_inode *) inode_buffer)-1)
221static char super_block_buffer[BLOCK_SIZE];
222
223#define Super (*(struct minix_super_block *)super_block_buffer)
224#define INODES ((unsigned long)Super.s_ninodes)
225#ifdef CONFIG_FEATURE_MINIX2
226static int version2;
227#define ZONES ((unsigned long)(version2 ? Super.s_zones : Super.s_nzones))
228#else
229#define ZONES ((unsigned long)(Super.s_nzones))
230#endif
231#define IMAPS ((unsigned long)Super.s_imap_blocks)
232#define ZMAPS ((unsigned long)Super.s_zmap_blocks)
233#define FIRSTZONE ((unsigned long)Super.s_firstdatazone)
234#define ZONESIZE ((unsigned long)Super.s_log_zone_size)
235#define MAXSIZE ((unsigned long)Super.s_max_size)
236#define MAGIC (Super.s_magic)
237#define NORM_FIRSTZONE (2+IMAPS+ZMAPS+INODE_BLOCKS)
238
239static char *inode_map;
240static char *zone_map;
241
242static unsigned char *inode_count;
243static unsigned char *zone_count;
244
245static void recursive_check(unsigned int ino);
246#ifdef CONFIG_FEATURE_MINIX2
247static void recursive_check2(unsigned int ino);
248#endif
249
250static inline int bit(char *a, unsigned int i)
251{
252 return (a[i >> 3] & (1<<(i & 7))) != 0;
253}
254#define inode_in_use(x) (bit(inode_map,(x)))
255#define zone_in_use(x) (bit(zone_map,(x)-FIRSTZONE+1))
256
257#define mark_inode(x) (setbit(inode_map,(x)),changed=1)
258#define unmark_inode(x) (clrbit(inode_map,(x)),changed=1)
259
260#define mark_zone(x) (setbit(zone_map,(x)-FIRSTZONE+1),changed=1)
261#define unmark_zone(x) (clrbit(zone_map,(x)-FIRSTZONE+1),changed=1)
262
263static void leave(int) ATTRIBUTE_NORETURN;
264static void leave(int status)
265{
266 if (termios_set)
267 tcsetattr(0, TCSANOW, &termios);
268 exit(status);
269}
270
271static void die(const char *str)
272{
273 bb_error_msg("%s", str);
274 leave(8);
275}
276
277/* File-name data */
278enum { MAX_DEPTH = 32 };
279static int name_depth;
280static char *current_name;
281static char *name_component[MAX_DEPTH+1];
282
283/* Wed Feb 9 15:17:06 MST 2000 */
284/* dynamically allocate name_list (instead of making it static) */
285static inline void alloc_current_name(void)
286{
287 current_name = xmalloc(MAX_DEPTH * (BUFSIZ + 1));
288 current_name[0] = '/';
289 current_name[1] = '\0';
290 name_component[0] = &current_name[0];
291}
292
293#ifdef CONFIG_FEATURE_CLEAN_UP
294/* execute this atexit() to deallocate name_list[] */
295/* piptigger was here */
296static inline void free_current_name(void)
297{
298 free(current_name);
299}
300#endif
301
302static void push_filename(const char *name)
303{
304 // /dir/dir/dir/file
305 // ^ ^ ^
306 // [0] [1] [2] <-name_component[i]
307 if (name_depth < MAX_DEPTH) {
308 int len;
309 char *p = name_component[name_depth];
310 *p++ = '/';
311 len = sprintf(p, "%.*s", namelen, name);
312 name_component[name_depth + 1] = p + len;
313 }
314 name_depth++;
315}
316
317static void pop_filename(void) {
318 name_depth--;
319 if (name_depth < MAX_DEPTH) {
320 *name_component[name_depth] = '\0';
321 if (!name_depth) {
322 current_name[0] = '/';
323 current_name[1] = '\0';
324 }
325 }
326}
327
328static int ask(const char *string, int def)
329{
330 int c;
331
332 if (!repair) {
333 printf("\n");
334 errors_uncorrected = 1;
335 return 0;
336 }
337 if (automatic) {
338 printf("\n");
339 if (!def)
340 errors_uncorrected = 1;
341 return def;
342 }
343 printf(def ? "%s (y/n)? " : "%s (n/y)? ", string);
344 for (;;) {
345 fflush(stdout);
346 if ((c = getchar()) == EOF) {
347 if (!def)
348 errors_uncorrected = 1;
349 return def;
350 }
351 c = toupper(c);
352 if (c == 'Y') {
353 def = 1;
354 break;
355 } else if (c == 'N') {
356 def = 0;
357 break;
358 } else if (c == ' ' || c == '\n')
359 break;
360 }
361 if (def)
362 printf("y\n");
363 else {
364 printf("n\n");
365 errors_uncorrected = 1;
366 }
367 return def;
368}
369
370/*
371 * Make certain that we aren't checking a filesystem that is on a
372 * mounted partition. Code adapted from e2fsck, Copyright (C) 1993,
373 * 1994 Theodore Ts'o. Also licensed under GPL.
374 */
375static void check_mount(void)
376{
377 FILE *f;
378 struct mntent *mnt;
379 int cont;
380 int fd;
381
382 if ((f = setmntent(MOUNTED, "r")) == NULL)
383 return;
384 while ((mnt = getmntent(f)) != NULL)
385 if (strcmp(device_name, mnt->mnt_fsname) == 0)
386 break;
387 endmntent(f);
388 if (!mnt)
389 return;
390
391 /*
392 * If the root is mounted read-only, then /etc/mtab is
393 * probably not correct; so we won't issue a warning based on
394 * it.
395 */
396 fd = open(MOUNTED, O_RDWR);
397 if (fd < 0 && errno == EROFS)
398 return;
399 else
400 close(fd);
401
402 printf("%s is mounted. ", device_name);
403 cont = 0;
404 if (isatty(0) && isatty(1))
405 cont = ask("Do you really want to continue", 0);
406 if (!cont) {
407 printf("Check aborted\n");
408 exit(0);
409 }
410 return;
411}
412
413/*
414 * check_zone_nr checks to see that *nr is a valid zone nr. If it
415 * isn't, it will possibly be repaired. Check_zone_nr sets *corrected
416 * if an error was corrected, and returns the zone (0 for no zone
417 * or a bad zone-number).
418 */
419static int check_zone_nr2(uint32_t *nr, int *corrected)
420{
421 const char *msg;
422 if (!*nr)
423 return 0;
424 if (*nr < FIRSTZONE)
425 msg = "< FIRSTZONE";
426 else if (*nr >= ZONES)
427 msg = ">= ZONES";
428 else
429 return *nr;
430 printf("Zone nr %s in file '%s'. ", msg, current_name);
431 if (ask("Remove block", 1)) {
432 *nr = 0;
433 *corrected = 1;
434 }
435 return 0;
436}
437
438static int check_zone_nr(uint16_t *nr, int *corrected)
439{
440 uint32_t nr32 = *nr;
441 int r = check_zone_nr2(&nr32, corrected);
442 *nr = (uint16_t)nr32;
443 return r;
444}
445
446/*
447 * read-block reads block nr into the buffer at addr.
448 */
449static void read_block(unsigned int nr, char *addr)
450{
451 if (!nr) {
452 memset(addr, 0, BLOCK_SIZE);
453 return;
454 }
455 if (BLOCK_SIZE * nr != lseek(IN, BLOCK_SIZE * nr, SEEK_SET)) {
456 printf("%s: unable to seek to block in file '%s'\n",
457 bb_msg_read_error, current_name);
458 errors_uncorrected = 1;
459 memset(addr, 0, BLOCK_SIZE);
460 } else if (BLOCK_SIZE != read(IN, addr, BLOCK_SIZE)) {
461 printf("%s: bad block in file '%s'\n",
462 bb_msg_read_error, current_name);
463 errors_uncorrected = 1;
464 memset(addr, 0, BLOCK_SIZE);
465 }
466}
467
468/*
469 * write_block writes block nr to disk.
470 */
471static void write_block(unsigned int nr, char *addr)
472{
473 if (!nr)
474 return;
475 if (nr < FIRSTZONE || nr >= ZONES) {
476 printf("Internal error: trying to write bad block\n"
477 "Write request ignored\n");
478 errors_uncorrected = 1;
479 return;
480 }
481 if (BLOCK_SIZE * nr != lseek(IN, BLOCK_SIZE * nr, SEEK_SET))
482 die("Seek failed in write_block");
483 if (BLOCK_SIZE != write(IN, addr, BLOCK_SIZE)) {
484 printf("%s: bad block in file '%s'\n",
485 bb_msg_write_error, current_name);
486 errors_uncorrected = 1;
487 }
488}
489
490/*
491 * map_block calculates the absolute block nr of a block in a file.
492 * It sets 'changed' if the inode has needed changing, and re-writes
493 * any indirect blocks with errors.
494 */
495static int map_block(struct minix_inode *inode, unsigned int blknr)
496{
497 uint16_t ind[BLOCK_SIZE >> 1];
498 uint16_t dind[BLOCK_SIZE >> 1];
499 int blk_chg, block, result;
500
501 if (blknr < 7)
502 return check_zone_nr(inode->i_zone + blknr, &changed);
503 blknr -= 7;
504 if (blknr < 512) {
505 block = check_zone_nr(inode->i_zone + 7, &changed);
506 read_block(block, (char *) ind);
507 blk_chg = 0;
508 result = check_zone_nr(blknr + ind, &blk_chg);
509 if (blk_chg)
510 write_block(block, (char *) ind);
511 return result;
512 }
513 blknr -= 512;
514 block = check_zone_nr(inode->i_zone + 8, &changed);
515 read_block(block, (char *) dind);
516 blk_chg = 0;
517 result = check_zone_nr(dind + (blknr / 512), &blk_chg);
518 if (blk_chg)
519 write_block(block, (char *) dind);
520 block = result;
521 read_block(block, (char *) ind);
522 blk_chg = 0;
523 result = check_zone_nr(ind + (blknr % 512), &blk_chg);
524 if (blk_chg)
525 write_block(block, (char *) ind);
526 return result;
527}
528
529#ifdef CONFIG_FEATURE_MINIX2
530static int map_block2(struct minix2_inode *inode, unsigned int blknr)
531{
532 uint32_t ind[BLOCK_SIZE >> 2];
533 uint32_t dind[BLOCK_SIZE >> 2];
534 uint32_t tind[BLOCK_SIZE >> 2];
535 int blk_chg, block, result;
536
537 if (blknr < 7)
538 return check_zone_nr2(inode->i_zone + blknr, &changed);
539 blknr -= 7;
540 if (blknr < 256) {
541 block = check_zone_nr2(inode->i_zone + 7, &changed);
542 read_block(block, (char *) ind);
543 blk_chg = 0;
544 result = check_zone_nr2(blknr + ind, &blk_chg);
545 if (blk_chg)
546 write_block(block, (char *) ind);
547 return result;
548 }
549 blknr -= 256;
550 if (blknr >= 256 * 256) {
551 block = check_zone_nr2(inode->i_zone + 8, &changed);
552 read_block(block, (char *) dind);
553 blk_chg = 0;
554 result = check_zone_nr2(dind + blknr / 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 blknr -= 256 * 256;
566 block = check_zone_nr2(inode->i_zone + 9, &changed);
567 read_block(block, (char *) tind);
568 blk_chg = 0;
569 result = check_zone_nr2(tind + blknr / (256 * 256), &blk_chg);
570 if (blk_chg)
571 write_block(block, (char *) tind);
572 block = result;
573 read_block(block, (char *) dind);
574 blk_chg = 0;
575 result = check_zone_nr2(dind + (blknr / 256) % 256, &blk_chg);
576 if (blk_chg)
577 write_block(block, (char *) dind);
578 block = result;
579 read_block(block, (char *) ind);
580 blk_chg = 0;
581 result = check_zone_nr2(ind + blknr % 256, &blk_chg);
582 if (blk_chg)
583 write_block(block, (char *) ind);
584 return result;
585}
586#endif
587
588static void write_super_block(void)
589{
590 /*
591 * Set the state of the filesystem based on whether or not there
592 * are uncorrected errors. The filesystem valid flag is
593 * unconditionally set if we get this far.
594 */
595 Super.s_state |= MINIX_VALID_FS;
596 if (errors_uncorrected)
597 Super.s_state |= MINIX_ERROR_FS;
598 else
599 Super.s_state &= ~MINIX_ERROR_FS;
600
601 if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
602 die("Seek failed in write_super_block");
603 if (BLOCK_SIZE != write(IN, super_block_buffer, BLOCK_SIZE))
604 die("Unable to write super-block");
605}
606
607static void write_tables(void)
608{
609 write_super_block();
610
611 if (IMAPS * BLOCK_SIZE != write(IN, inode_map, IMAPS * BLOCK_SIZE))
612 die("Unable to write inode map");
613 if (ZMAPS * BLOCK_SIZE != write(IN, zone_map, ZMAPS * BLOCK_SIZE))
614 die("Unable to write zone map");
615 if (INODE_BUFFER_SIZE != write(IN, inode_buffer, INODE_BUFFER_SIZE))
616 die("Unable to write inodes");
617}
618
619static void get_dirsize(void)
620{
621 int block;
622 char blk[BLOCK_SIZE];
623 int size;
624
625#ifdef CONFIG_FEATURE_MINIX2
626 if (version2)
627 block = Inode2[ROOT_INO].i_zone[0];
628 else
629#endif
630 block = Inode[ROOT_INO].i_zone[0];
631 read_block(block, blk);
632 for (size = 16; size < BLOCK_SIZE; size <<= 1) {
633 if (strcmp(blk + size + 2, "..") == 0) {
634 dirsize = size;
635 namelen = size - 2;
636 return;
637 }
638 }
639 /* use defaults */
640}
641
642static void read_superblock(void)
643{
644 if (BLOCK_SIZE != lseek(IN, BLOCK_SIZE, SEEK_SET))
645 die("Seek failed");
646 if (BLOCK_SIZE != read(IN, super_block_buffer, BLOCK_SIZE))
647 die("Unable to read super block");
648 /* already initialized to:
649 namelen = 14;
650 dirsize = 16;
651 version2 = 0;
652 */
653 if (MAGIC == MINIX_SUPER_MAGIC) {
654 } else if (MAGIC == MINIX_SUPER_MAGIC2) {
655 namelen = 30;
656 dirsize = 32;
657#ifdef CONFIG_FEATURE_MINIX2
658 } else if (MAGIC == MINIX2_SUPER_MAGIC) {
659 version2 = 1;
660 } else if (MAGIC == MINIX2_SUPER_MAGIC2) {
661 namelen = 30;
662 dirsize = 32;
663 version2 = 1;
664#endif
665 } else
666 die("Bad magic number in super-block");
667 if (ZONESIZE != 0 || BLOCK_SIZE != 1024)
668 die("Only 1k blocks/zones supported");
669 if (IMAPS * BLOCK_SIZE * 8 < INODES + 1)
670 die("Bad s_imap_blocks field in super-block");
671 if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1)
672 die("Bad s_zmap_blocks field in super-block");
673}
674
675static void read_tables(void)
676{
677 inode_map = xzalloc(IMAPS * BLOCK_SIZE);
678 zone_map = xzalloc(ZMAPS * BLOCK_SIZE);
679 inode_buffer = xmalloc(INODE_BUFFER_SIZE);
680 inode_count = xmalloc(INODES + 1);
681 zone_count = xmalloc(ZONES);
682 if (IMAPS * BLOCK_SIZE != read(IN, inode_map, IMAPS * BLOCK_SIZE))
683 die("Unable to read inode map");
684 if (ZMAPS * BLOCK_SIZE != read(IN, zone_map, ZMAPS * BLOCK_SIZE))
685 die("Unable to read zone map");
686 if (INODE_BUFFER_SIZE != read(IN, inode_buffer, INODE_BUFFER_SIZE))
687 die("Unable to read inodes");
688 if (NORM_FIRSTZONE != FIRSTZONE) {
689 printf("Warning: Firstzone!=Norm_firstzone\n");
690 errors_uncorrected = 1;
691 }
692 get_dirsize();
693 if (show) {
694 printf("%ld inodes\n"
695 "%ld blocks\n"
696 "Firstdatazone=%ld (%ld)\n"
697 "Zonesize=%d\n"
698 "Maxsize=%ld\n"
699 "Filesystem state=%d\n"
700 "namelen=%d\n\n",
701 INODES,
702 ZONES,
703 FIRSTZONE, NORM_FIRSTZONE,
704 BLOCK_SIZE << ZONESIZE,
705 MAXSIZE,
706 Super.s_state,
707 namelen);
708 }
709}
710
711static struct minix_inode *get_inode(unsigned int nr)
712{
713 struct minix_inode *inode;
714
715 if (!nr || nr > INODES)
716 return NULL;
717 total++;
718 inode = Inode + nr;
719 if (!inode_count[nr]) {
720 if (!inode_in_use(nr)) {
721 printf("Inode %d is marked as 'unused', but it is used "
722 "for file '%s'\n", nr, current_name);
723 if (repair) {
724 if (ask("Mark as 'in use'", 1))
725 mark_inode(nr);
726 } else {
727 errors_uncorrected = 1;
728 }
729 }
730 if (S_ISDIR(inode->i_mode))
731 directory++;
732 else if (S_ISREG(inode->i_mode))
733 regular++;
734 else if (S_ISCHR(inode->i_mode))
735 chardev++;
736 else if (S_ISBLK(inode->i_mode))
737 blockdev++;
738 else if (S_ISLNK(inode->i_mode))
739 symlinks++;
740 else if (S_ISSOCK(inode->i_mode));
741 else if (S_ISFIFO(inode->i_mode));
742 else {
743 printf("%s has mode %05o\n", current_name, inode->i_mode);
744 }
745
746 } else
747 links++;
748 if (!++inode_count[nr]) {
749 printf("Warning: inode count too big\n");
750 inode_count[nr]--;
751 errors_uncorrected = 1;
752 }
753 return inode;
754}
755
756#ifdef CONFIG_FEATURE_MINIX2
757static struct minix2_inode *get_inode2(unsigned int nr)
758{
759 struct minix2_inode *inode;
760
761 if (!nr || nr > INODES)
762 return NULL;
763 total++;
764 inode = Inode2 + nr;
765 if (!inode_count[nr]) {
766 if (!inode_in_use(nr)) {
767 printf("Inode %d is marked as 'unused', but it is used "
768 "for file '%s'\n", nr, current_name);
769 if (repair) {
770 if (ask("Mark as 'in use'", 1))
771 mark_inode(nr);
772 else
773 errors_uncorrected = 1;
774 }
775 }
776 if (S_ISDIR(inode->i_mode))
777 directory++;
778 else if (S_ISREG(inode->i_mode))
779 regular++;
780 else if (S_ISCHR(inode->i_mode))
781 chardev++;
782 else if (S_ISBLK(inode->i_mode))
783 blockdev++;
784 else if (S_ISLNK(inode->i_mode))
785 symlinks++;
786 else if (S_ISSOCK(inode->i_mode));
787 else if (S_ISFIFO(inode->i_mode));
788 else {
789 printf("%s has mode %05o\n", current_name, inode->i_mode);
790 }
791 } else
792 links++;
793 if (!++inode_count[nr]) {
794 printf("Warning: inode count too big\n");
795 inode_count[nr]--;
796 errors_uncorrected = 1;
797 }
798 return inode;
799}
800#endif
801
802static void check_root(void)
803{
804 struct minix_inode *inode = Inode + ROOT_INO;
805
806 if (!inode || !S_ISDIR(inode->i_mode))
807 die("Root inode isn't a directory");
808}
809
810#ifdef CONFIG_FEATURE_MINIX2
811static void check_root2(void)
812{
813 struct minix2_inode *inode = Inode2 + ROOT_INO;
814
815 if (!inode || !S_ISDIR(inode->i_mode))
816 die("Root inode isn't a directory");
817}
818#endif
819
820static int add_zone(uint16_t *znr, int *corrected)
821{
822 int result;
823 int block;
824
825 result = 0;
826 block = check_zone_nr(znr, corrected);
827 if (!block)
828 return 0;
829 if (zone_count[block]) {
830 printf("Already used block is reused in file '%s'. ",
831 current_name);
832 if (ask("Clear", 1)) {
833 *znr = 0;
834 block = 0;
835 *corrected = 1;
836 return 0;
837 }
838 }
839 if (!zone_in_use(block)) {
840 printf("Block %d in file '%s' is marked as 'unused'. ",
841 block, current_name);
842 if (ask("Correct", 1))
843 mark_zone(block);
844 }
845 if (!++zone_count[block])
846 zone_count[block]--;
847 return block;
848}
849
850#ifdef CONFIG_FEATURE_MINIX2
851static int add_zone2(uint32_t *znr, int *corrected)
852{
853 int result;
854 int block;
855
856 result = 0;
857 block = check_zone_nr2(znr, corrected);
858 if (!block)
859 return 0;
860 if (zone_count[block]) {
861 printf("Already used block is reused in file '%s'. ",
862 current_name);
863 if (ask("Clear", 1)) {
864 *znr = 0;
865 block = 0;
866 *corrected = 1;
867 return 0;
868 }
869 }
870 if (!zone_in_use(block)) {
871 printf("Block %d in file '%s' is marked as 'unused'. ",
872 block, current_name);
873 if (ask("Correct", 1))
874 mark_zone(block);
875 }
876 if (!++zone_count[block])
877 zone_count[block]--;
878 return block;
879}
880#endif
881
882static void add_zone_ind(uint16_t *znr, int *corrected)
883{
884 static char blk[BLOCK_SIZE];
885 int i, chg_blk = 0;
886 int block;
887
888 block = add_zone(znr, corrected);
889 if (!block)
890 return;
891 read_block(block, blk);
892 for (i = 0; i < (BLOCK_SIZE >> 1); i++)
893 add_zone(i + (uint16_t *) blk, &chg_blk);
894 if (chg_blk)
895 write_block(block, blk);
896}
897
898#ifdef CONFIG_FEATURE_MINIX2
899static void add_zone_ind2(uint32_t *znr, int *corrected)
900{
901 static char blk[BLOCK_SIZE];
902 int i, chg_blk = 0;
903 int block;
904
905 block = add_zone2(znr, corrected);
906 if (!block)
907 return;
908 read_block(block, blk);
909 for (i = 0; i < BLOCK_SIZE >> 2; i++)
910 add_zone2(i + (uint32_t *) blk, &chg_blk);
911 if (chg_blk)
912 write_block(block, blk);
913}
914#endif
915
916static void add_zone_dind(uint16_t *znr, int *corrected)
917{
918 static char blk[BLOCK_SIZE];
919 int i, blk_chg = 0;
920 int block;
921
922 block = add_zone(znr, corrected);
923 if (!block)
924 return;
925 read_block(block, blk);
926 for (i = 0; i < (BLOCK_SIZE >> 1); i++)
927 add_zone_ind(i + (uint16_t *) blk, &blk_chg);
928 if (blk_chg)
929 write_block(block, blk);
930}
931
932#ifdef CONFIG_FEATURE_MINIX2
933static void add_zone_dind2(uint32_t *znr, int *corrected)
934{
935 static char blk[BLOCK_SIZE];
936 int i, blk_chg = 0;
937 int block;
938
939 block = add_zone2(znr, corrected);
940 if (!block)
941 return;
942 read_block(block, blk);
943 for (i = 0; i < BLOCK_SIZE >> 2; i++)
944 add_zone_ind2(i + (uint32_t *) blk, &blk_chg);
945 if (blk_chg)
946 write_block(block, blk);
947}
948
949static void add_zone_tind2(uint32_t *znr, int *corrected)
950{
951 static char blk[BLOCK_SIZE];
952 int i, blk_chg = 0;
953 int block;
954
955 block = add_zone2(znr, corrected);
956 if (!block)
957 return;
958 read_block(block, blk);
959 for (i = 0; i < BLOCK_SIZE >> 2; i++)
960 add_zone_dind2(i + (uint32_t *) blk, &blk_chg);
961 if (blk_chg)
962 write_block(block, blk);
963}
964#endif
965
966static void check_zones(unsigned int i)
967{
968 struct minix_inode *inode;
969
970 if (!i || i > INODES)
971 return;
972 if (inode_count[i] > 1) /* have we counted this file already? */
973 return;
974 inode = Inode + i;
975 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode) &&
976 !S_ISLNK(inode->i_mode)) return;
977 for (i = 0; i < 7; i++)
978 add_zone(i + inode->i_zone, &changed);
979 add_zone_ind(7 + inode->i_zone, &changed);
980 add_zone_dind(8 + inode->i_zone, &changed);
981}
982
983#ifdef CONFIG_FEATURE_MINIX2
984static void check_zones2(unsigned int i)
985{
986 struct minix2_inode *inode;
987
988 if (!i || i > INODES)
989 return;
990 if (inode_count[i] > 1) /* have we counted this file already? */
991 return;
992 inode = Inode2 + i;
993 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode)
994 && !S_ISLNK(inode->i_mode))
995 return;
996 for (i = 0; i < 7; i++)
997 add_zone2(i + inode->i_zone, &changed);
998 add_zone_ind2(7 + inode->i_zone, &changed);
999 add_zone_dind2(8 + inode->i_zone, &changed);
1000 add_zone_tind2(9 + inode->i_zone, &changed);
1001}
1002#endif
1003
1004static void check_file(struct minix_inode *dir, unsigned int offset)
1005{
1006 static char blk[BLOCK_SIZE];
1007 struct minix_inode *inode;
1008 int ino;
1009 char *name;
1010 int block;
1011
1012 block = map_block(dir, offset / BLOCK_SIZE);
1013 read_block(block, blk);
1014 name = blk + (offset % BLOCK_SIZE) + 2;
1015 ino = *(uint16_t *) (name - 2);
1016 if (ino > INODES) {
1017 printf("%s contains a bad inode number for file '%.*s'. ",
1018 current_name, namelen, name);
1019 if (ask("Remove", 1)) {
1020 *(uint16_t *) (name - 2) = 0;
1021 write_block(block, blk);
1022 }
1023 ino = 0;
1024 }
1025 push_filename(name);
1026 inode = get_inode(ino);
1027 pop_filename();
1028 if (!offset) {
1029 if (!inode || strcmp(".", name)) {
1030 printf("%s: bad directory: '.' isn't first\n", current_name);
1031 errors_uncorrected = 1;
1032 } else
1033 return;
1034 }
1035 if (offset == dirsize) {
1036 if (!inode || strcmp("..", name)) {
1037 printf("%s: bad directory: '..' isn't second\n", current_name);
1038 errors_uncorrected = 1;
1039 } else
1040 return;
1041 }
1042 if (!inode)
1043 return;
1044 push_filename(name);
1045 if (list) {
1046 if (verbose)
1047 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks);
1048 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : "");
1049 }
1050 check_zones(ino);
1051 if (inode && S_ISDIR(inode->i_mode))
1052 recursive_check(ino);
1053 pop_filename();
1054 return;
1055}
1056
1057#ifdef CONFIG_FEATURE_MINIX2
1058static void check_file2(struct minix2_inode *dir, unsigned int offset)
1059{
1060 static char blk[BLOCK_SIZE];
1061 struct minix2_inode *inode;
1062 int ino;
1063 char *name;
1064 int block;
1065
1066 block = map_block2(dir, offset / BLOCK_SIZE);
1067 read_block(block, blk);
1068 name = blk + (offset % BLOCK_SIZE) + 2;
1069 ino = *(uint16_t *) (name - 2);
1070 if (ino > INODES) {
1071 printf("%s contains a bad inode number for file '%.*s'. ",
1072 current_name, namelen, name);
1073 if (ask("Remove", 1)) {
1074 *(uint16_t *) (name - 2) = 0;
1075 write_block(block, blk);
1076 }
1077 ino = 0;
1078 }
1079 push_filename(name);
1080 inode = get_inode2(ino);
1081 pop_filename();
1082 if (!offset) {
1083 if (!inode || strcmp(".", name)) {
1084 printf("%s: bad directory: '.' isn't first\n", current_name);
1085 errors_uncorrected = 1;
1086 } else
1087 return;
1088 }
1089 if (offset == dirsize) {
1090 if (!inode || strcmp("..", name)) {
1091 printf("%s: bad directory: '..' isn't second\n", current_name);
1092 errors_uncorrected = 1;
1093 } else
1094 return;
1095 }
1096 if (!inode)
1097 return;
1098 push_filename(name);
1099 if (list) {
1100 if (verbose)
1101 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks);
1102 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : "");
1103 }
1104 check_zones2(ino);
1105 if (inode && S_ISDIR(inode->i_mode))
1106 recursive_check2(ino);
1107 pop_filename();
1108 return;
1109}
1110#endif
1111
1112static void recursive_check(unsigned int ino)
1113{
1114 struct minix_inode *dir;
1115 unsigned int offset;
1116
1117 dir = Inode + ino;
1118 if (!S_ISDIR(dir->i_mode))
1119 die("Internal error");
1120 if (dir->i_size < 2 * dirsize) {
1121 printf("%s: bad directory: size<32", current_name);
1122 errors_uncorrected = 1;
1123 }
1124 for (offset = 0; offset < dir->i_size; offset += dirsize)
1125 check_file(dir, offset);
1126}
1127
1128#ifdef CONFIG_FEATURE_MINIX2
1129static void recursive_check2(unsigned int ino)
1130{
1131 struct minix2_inode *dir;
1132 unsigned int offset;
1133
1134 dir = Inode2 + ino;
1135 if (!S_ISDIR(dir->i_mode))
1136 die("Internal error");
1137 if (dir->i_size < 2 * dirsize) {
1138 printf("%s: bad directory: size<32", current_name);
1139 errors_uncorrected = 1;
1140 }
1141 for (offset = 0; offset < dir->i_size; offset += dirsize)
1142 check_file2(dir, offset);
1143}
1144#endif
1145
1146static int bad_zone(int i)
1147{
1148 char buffer[1024];
1149
1150 if (BLOCK_SIZE * i != lseek(IN, BLOCK_SIZE * i, SEEK_SET))
1151 die("Seek failed in bad_zone");
1152 return (BLOCK_SIZE != read(IN, buffer, BLOCK_SIZE));
1153}
1154
1155static void check_counts(void)
1156{
1157 int i;
1158
1159 for (i = 1; i <= INODES; i++) {
1160 if (warn_mode && Inode[i].i_mode && !inode_in_use(i)) {
1161 printf("Inode %d has non-zero mode. ", i);
1162 if (ask("Clear", 1)) {
1163 Inode[i].i_mode = 0;
1164 changed = 1;
1165 }
1166 }
1167 if (!inode_count[i]) {
1168 if (!inode_in_use(i))
1169 continue;
1170 printf("Unused inode %d is marked as 'used' in the bitmap. ", i);
1171 if (ask("Clear", 1))
1172 unmark_inode(i);
1173 continue;
1174 }
1175 if (!inode_in_use(i)) {
1176 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i);
1177 if (ask("Set", 1))
1178 mark_inode(i);
1179 }
1180 if (Inode[i].i_nlinks != inode_count[i]) {
1181 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ",
1182 i, Inode[i].i_mode, Inode[i].i_nlinks, inode_count[i]);
1183 if (ask("Set i_nlinks to count", 1)) {
1184 Inode[i].i_nlinks = inode_count[i];
1185 changed = 1;
1186 }
1187 }
1188 }
1189 for (i = FIRSTZONE; i < ZONES; i++) {
1190 if (zone_in_use(i) == zone_count[i])
1191 continue;
1192 if (!zone_count[i]) {
1193 if (bad_zone(i))
1194 continue;
1195 printf("Zone %d is marked 'in use', but no file uses it. ", i);
1196 if (ask("Unmark", 1))
1197 unmark_zone(i);
1198 continue;
1199 }
1200 printf("Zone %d: %sin use, counted=%d\n",
1201 i, zone_in_use(i) ? "" : "not ", zone_count[i]);
1202 }
1203}
1204
1205#ifdef CONFIG_FEATURE_MINIX2
1206static void check_counts2(void)
1207{
1208 int i;
1209
1210 for (i = 1; i <= INODES; i++) {
1211 if (warn_mode && Inode2[i].i_mode && !inode_in_use(i)) {
1212 printf("Inode %d has non-zero mode. ", i);
1213 if (ask("Clear", 1)) {
1214 Inode2[i].i_mode = 0;
1215 changed = 1;
1216 }
1217 }
1218 if (!inode_count[i]) {
1219 if (!inode_in_use(i))
1220 continue;
1221 printf("Unused inode %d is marked as 'used' in the bitmap. ", i);
1222 if (ask("Clear", 1))
1223 unmark_inode(i);
1224 continue;
1225 }
1226 if (!inode_in_use(i)) {
1227 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i);
1228 if (ask("Set", 1))
1229 mark_inode(i);
1230 }
1231 if (Inode2[i].i_nlinks != inode_count[i]) {
1232 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ",
1233 i, Inode2[i].i_mode, Inode2[i].i_nlinks,
1234 inode_count[i]);
1235 if (ask("Set i_nlinks to count", 1)) {
1236 Inode2[i].i_nlinks = inode_count[i];
1237 changed = 1;
1238 }
1239 }
1240 }
1241 for (i = FIRSTZONE; i < ZONES; i++) {
1242 if (zone_in_use(i) == zone_count[i])
1243 continue;
1244 if (!zone_count[i]) {
1245 if (bad_zone(i))
1246 continue;
1247 printf("Zone %d is marked 'in use', but no file uses it. ", i);
1248 if (ask("Unmark", 1))
1249 unmark_zone(i);
1250 continue;
1251 }
1252 printf("Zone %d: %sin use, counted=%d\n",
1253 i, zone_in_use(i) ? "" : "not ", zone_count[i]);
1254 }
1255}
1256#endif
1257
1258static void check(void)
1259{
1260 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count));
1261 memset(zone_count, 0, ZONES * sizeof(*zone_count));
1262 check_zones(ROOT_INO);
1263 recursive_check(ROOT_INO);
1264 check_counts();
1265}
1266
1267#ifdef CONFIG_FEATURE_MINIX2
1268static void check2(void)
1269{
1270 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count));
1271 memset(zone_count, 0, ZONES * sizeof(*zone_count));
1272 check_zones2(ROOT_INO);
1273 recursive_check2(ROOT_INO);
1274 check_counts2();
1275}
1276#endif
1277
1278int fsck_minix_main(int argc, char **argv)
1279{
1280 struct termios tmp;
1281 int retcode = 0;
1282
1283 alloc_current_name();
1284#ifdef CONFIG_FEATURE_CLEAN_UP
1285 /* Don't bother to free memory. Exit does
1286 * that automagically, so we can save a few bytes */
1287 atexit(free_current_name);
1288#endif
1289
1290 if (INODE_SIZE * MINIX_INODES_PER_BLOCK != BLOCK_SIZE)
1291 die("Bad inode size");
1292#ifdef CONFIG_FEATURE_MINIX2
1293 if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE)
1294 die("Bad v2 inode size");
1295#endif
1296 while (argc-- > 1) {
1297 argv++;
1298 if (argv[0][0] != '-') {
1299 if (device_name)
1300 bb_show_usage();
1301 else
1302 device_name = argv[0];
1303 } else
1304 while (*++argv[0])
1305 switch (argv[0][0]) {
1306 case 'l':
1307 list = 1;
1308 break;
1309 case 'a':
1310 automatic = 1;
1311 repair = 1;
1312 break;
1313 case 'r':
1314 automatic = 0;
1315 repair = 1;
1316 break;
1317 case 'v':
1318 verbose = 1;
1319 break;
1320 case 's':
1321 show = 1;
1322 break;
1323 case 'm':
1324 warn_mode = 1;
1325 break;
1326 case 'f':
1327 force = 1;
1328 break;
1329 default:
1330 bb_show_usage();
1331 }
1332 }
1333 if (!device_name)
1334 bb_show_usage();
1335 check_mount(); /* trying to check a mounted filesystem? */
1336 if (repair && !automatic) {
1337 if (!isatty(0) || !isatty(1))
1338 die("Need terminal for interactive repairs");
1339 }
1340 IN = open(device_name, repair ? O_RDWR : O_RDONLY);
1341 if (IN < 0){
1342 printf("Unable to open device '%s'\n", device_name);
1343 leave(8);
1344 }
1345 sync(); /* paranoia? */
1346 read_superblock();
1347
1348 /*
1349 * Determine whether or not we should continue with the checking.
1350 * This is based on the status of the filesystem valid and error
1351 * flags and whether or not the -f switch was specified on the
1352 * command line.
1353 */
1354 printf("%s, %s\n", bb_applet_name, program_version);
1355 if (!(Super.s_state & MINIX_ERROR_FS) &&
1356 (Super.s_state & MINIX_VALID_FS) && !force) {
1357 if (repair)
1358 printf("%s is clean, check is skipped\n", device_name);
1359 return retcode;
1360 } else if (force)
1361 printf("Forcing filesystem check on %s\n", device_name);
1362 else if (repair)
1363 printf("Filesystem on %s is dirty, needs checking\n",
1364 device_name);
1365
1366 read_tables();
1367
1368 if (repair && !automatic) {
1369 tcgetattr(0, &termios);
1370 tmp = termios;
1371 tmp.c_lflag &= ~(ICANON | ECHO);
1372 tcsetattr(0, TCSANOW, &tmp);
1373 termios_set = 1;
1374 }
1375#ifdef CONFIG_FEATURE_MINIX2
1376 if (version2) {
1377 check_root2();
1378 check2();
1379 } else
1380#endif
1381 {
1382 check_root();
1383 check();
1384 }
1385 if (verbose) {
1386 int i, free_cnt;
1387
1388 for (i = 1, free_cnt = 0; i <= INODES; i++)
1389 if (!inode_in_use(i))
1390 free_cnt++;
1391 printf("\n%6ld inodes used (%ld%%)\n", (INODES - free_cnt),
1392 100 * (INODES - free_cnt) / INODES);
1393 for (i = FIRSTZONE, free_cnt = 0; i < ZONES; i++)
1394 if (!zone_in_use(i))
1395 free_cnt++;
1396 printf("%6ld zones used (%ld%%)\n\n"
1397 "%6d regular files\n"
1398 "%6d directories\n"
1399 "%6d character device files\n"
1400 "%6d block device files\n"
1401 "%6d links\n"
1402 "%6d symbolic links\n"
1403 "------\n"
1404 "%6d files\n",
1405 (ZONES - free_cnt), 100 * (ZONES - free_cnt) / ZONES,
1406 regular, directory, chardev, blockdev,
1407 links - 2 * directory + 1, symlinks,
1408 total - 2 * directory + 1);
1409 }
1410 if (changed) {
1411 write_tables();
1412 printf("FILE SYSTEM HAS BEEN CHANGED\n");
1413 sync();
1414 } else if (repair)
1415 write_super_block();
1416
1417 if (repair && !automatic)
1418 tcsetattr(0, TCSANOW, &termios);
1419
1420 if (changed)
1421 retcode += 3;
1422 if (errors_uncorrected)
1423 retcode += 4;
1424 return retcode;
1425}
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