source: MondoRescue/branches/2.2.5/mindi-busybox/util-linux/fsck_minix.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
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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] = &current_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}
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