source: MondoRescue/branches/3.2/mindi-busybox/util-linux/fsck_minix.c

Last change on this file was 3232, checked in by Bruno Cornec, 10 years ago
  • Update mindi-busybox to 1.21.1
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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 source tree.
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 * 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 * superblock 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 Mickiewicz <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 superblock 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//usage:#define fsck_minix_trivial_usage
90//usage: "[-larvsmf] BLOCKDEV"
91//usage:#define fsck_minix_full_usage "\n\n"
92//usage: "Check MINIX filesystem\n"
93//usage: "\n -l List all filenames"
94//usage: "\n -r Perform interactive repairs"
95//usage: "\n -a Perform automatic repairs"
96//usage: "\n -v Verbose"
97//usage: "\n -s Output superblock information"
98//usage: "\n -m Show \"mode not cleared\" warnings"
99//usage: "\n -f Force file system check"
100
101#include <mntent.h>
102#include "libbb.h"
103#include "minix.h"
104
105#ifndef BLKGETSIZE
106#define BLKGETSIZE _IO(0x12,96) /* return device size */
107#endif
108
109struct BUG_bad_inode_size {
110 char BUG_bad_inode1_size[(INODE_SIZE1 * MINIX1_INODES_PER_BLOCK != BLOCK_SIZE) ? -1 : 1];
111#if ENABLE_FEATURE_MINIX2
112 char BUG_bad_inode2_size[(INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE) ? -1 : 1];
113#endif
114};
115
116enum {
117#ifdef UNUSED
118 MINIX1_LINK_MAX = 250,
119 MINIX2_LINK_MAX = 65530,
120 MINIX_I_MAP_SLOTS = 8,
121 MINIX_Z_MAP_SLOTS = 64,
122 MINIX_V1 = 0x0001, /* original minix fs */
123 MINIX_V2 = 0x0002, /* minix V2 fs */
124#endif
125 MINIX_NAME_MAX = 255, /* # chars in a file name */
126};
127
128
129#if !ENABLE_FEATURE_MINIX2
130enum { version2 = 0 };
131#endif
132
133enum { MAX_DEPTH = 32 };
134
135enum { dev_fd = 3 };
136
137struct globals {
138#if ENABLE_FEATURE_MINIX2
139 smallint version2;
140#endif
141 smallint changed; /* is filesystem modified? */
142 smallint errors_uncorrected; /* flag if some error was not corrected */
143 smallint termios_set;
144 smallint dirsize;
145 smallint namelen;
146 const char *device_name;
147 int directory, regular, blockdev, chardev, links, symlinks, total;
148 char *inode_buffer;
149
150 char *inode_map;
151 char *zone_map;
152
153 unsigned char *inode_count;
154 unsigned char *zone_count;
155
156 /* File-name data */
157 int name_depth;
158 char *name_component[MAX_DEPTH+1];
159
160 /* Bigger stuff */
161 struct termios sv_termios;
162 char superblock_buffer[BLOCK_SIZE];
163 char add_zone_ind_blk[BLOCK_SIZE];
164 char add_zone_dind_blk[BLOCK_SIZE];
165 IF_FEATURE_MINIX2(char add_zone_tind_blk[BLOCK_SIZE];)
166 char check_file_blk[BLOCK_SIZE];
167
168 /* File-name data */
169 char current_name[MAX_DEPTH * MINIX_NAME_MAX];
170};
171#define G (*ptr_to_globals)
172#if ENABLE_FEATURE_MINIX2
173#define version2 (G.version2 )
174#endif
175#define changed (G.changed )
176#define errors_uncorrected (G.errors_uncorrected )
177#define termios_set (G.termios_set )
178#define dirsize (G.dirsize )
179#define namelen (G.namelen )
180#define device_name (G.device_name )
181#define directory (G.directory )
182#define regular (G.regular )
183#define blockdev (G.blockdev )
184#define chardev (G.chardev )
185#define links (G.links )
186#define symlinks (G.symlinks )
187#define total (G.total )
188#define inode_buffer (G.inode_buffer )
189#define inode_map (G.inode_map )
190#define zone_map (G.zone_map )
191#define inode_count (G.inode_count )
192#define zone_count (G.zone_count )
193#define name_depth (G.name_depth )
194#define name_component (G.name_component )
195#define sv_termios (G.sv_termios )
196#define superblock_buffer (G.superblock_buffer )
197#define add_zone_ind_blk (G.add_zone_ind_blk )
198#define add_zone_dind_blk (G.add_zone_dind_blk )
199#define add_zone_tind_blk (G.add_zone_tind_blk )
200#define check_file_blk (G.check_file_blk )
201#define current_name (G.current_name )
202#define INIT_G() do { \
203 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
204 dirsize = 16; \
205 namelen = 14; \
206 current_name[0] = '/'; \
207 /*current_name[1] = '\0';*/ \
208 name_component[0] = &current_name[0]; \
209} while (0)
210
211
212#define OPTION_STR "larvsmf"
213enum {
214 OPT_l = (1 << 0),
215 OPT_a = (1 << 1),
216 OPT_r = (1 << 2),
217 OPT_v = (1 << 3),
218 OPT_s = (1 << 4),
219 OPT_w = (1 << 5),
220 OPT_f = (1 << 6),
221};
222#define OPT_list (option_mask32 & OPT_l)
223#define OPT_automatic (option_mask32 & OPT_a)
224#define OPT_repair (option_mask32 & OPT_r)
225#define OPT_verbose (option_mask32 & OPT_v)
226#define OPT_show (option_mask32 & OPT_s)
227#define OPT_warn_mode (option_mask32 & OPT_w)
228#define OPT_force (option_mask32 & OPT_f)
229/* non-automatic repairs requested? */
230#define OPT_manual ((option_mask32 & (OPT_a|OPT_r)) == OPT_r)
231
232
233#define Inode1 (((struct minix1_inode *) inode_buffer)-1)
234#define Inode2 (((struct minix2_inode *) inode_buffer)-1)
235
236#define Super (*(struct minix_superblock *)(superblock_buffer))
237
238#if ENABLE_FEATURE_MINIX2
239# define ZONES ((unsigned)(version2 ? Super.s_zones : Super.s_nzones))
240#else
241# define ZONES ((unsigned)(Super.s_nzones))
242#endif
243#define INODES ((unsigned)Super.s_ninodes)
244#define IMAPS ((unsigned)Super.s_imap_blocks)
245#define ZMAPS ((unsigned)Super.s_zmap_blocks)
246#define FIRSTZONE ((unsigned)Super.s_firstdatazone)
247#define ZONESIZE ((unsigned)Super.s_log_zone_size)
248#define MAXSIZE ((unsigned)Super.s_max_size)
249#define MAGIC (Super.s_magic)
250
251/* gcc likes this more (code is smaller) than macro variant */
252static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n)
253{
254 return (size + n-1) / n;
255}
256
257#if !ENABLE_FEATURE_MINIX2
258#define INODE_BLOCKS div_roundup(INODES, MINIX1_INODES_PER_BLOCK)
259#else
260#define INODE_BLOCKS div_roundup(INODES, \
261 (version2 ? MINIX2_INODES_PER_BLOCK : MINIX1_INODES_PER_BLOCK))
262#endif
263
264#define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE)
265#define NORM_FIRSTZONE (2 + IMAPS + ZMAPS + INODE_BLOCKS)
266
267/* Before you ask "where they come from?": */
268/* setbit/clrbit are supplied by sys/param.h */
269
270static int minix_bit(const char *a, unsigned i)
271{
272 return (a[i >> 3] & (1<<(i & 7)));
273}
274
275static void minix_setbit(char *a, unsigned i)
276{
277 setbit(a, i);
278 changed = 1;
279}
280static void minix_clrbit(char *a, unsigned i)
281{
282 clrbit(a, i);
283 changed = 1;
284}
285
286/* Note: do not assume 0/1, it is 0/nonzero */
287#define zone_in_use(x) (minix_bit(zone_map,(x)-FIRSTZONE+1))
288#define inode_in_use(x) (minix_bit(inode_map,(x)))
289
290#define mark_inode(x) (minix_setbit(inode_map,(x)))
291#define unmark_inode(x) (minix_clrbit(inode_map,(x)))
292
293#define mark_zone(x) (minix_setbit(zone_map,(x)-FIRSTZONE+1))
294#define unmark_zone(x) (minix_clrbit(zone_map,(x)-FIRSTZONE+1))
295
296
297static void recursive_check(unsigned ino);
298#if ENABLE_FEATURE_MINIX2
299static void recursive_check2(unsigned ino);
300#endif
301
302static void die(const char *str) NORETURN;
303static void die(const char *str)
304{
305 if (termios_set)
306 tcsetattr_stdin_TCSANOW(&sv_termios);
307 bb_error_msg_and_die("%s", str);
308}
309
310static void push_filename(const char *name)
311{
312 // /dir/dir/dir/file
313 // ^ ^ ^
314 // [0] [1] [2] <-name_component[i]
315 if (name_depth < MAX_DEPTH) {
316 int len;
317 char *p = name_component[name_depth];
318 *p++ = '/';
319 len = sprintf(p, "%.*s", namelen, name);
320 name_component[name_depth + 1] = p + len;
321 }
322 name_depth++;
323}
324
325static void pop_filename(void)
326{
327 name_depth--;
328 if (name_depth < MAX_DEPTH) {
329 *name_component[name_depth] = '\0';
330 if (!name_depth) {
331 current_name[0] = '/';
332 current_name[1] = '\0';
333 }
334 }
335}
336
337static int ask(const char *string, int def)
338{
339 int c;
340
341 if (!OPT_repair) {
342 bb_putchar('\n');
343 errors_uncorrected = 1;
344 return 0;
345 }
346 if (OPT_automatic) {
347 bb_putchar('\n');
348 if (!def)
349 errors_uncorrected = 1;
350 return def;
351 }
352 printf(def ? "%s (y/n)? " : "%s (n/y)? ", string);
353 for (;;) {
354 fflush_all();
355 c = getchar();
356 if (c == EOF) {
357 if (!def)
358 errors_uncorrected = 1;
359 return def;
360 }
361 if (c == '\n')
362 break;
363 c |= 0x20; /* tolower */
364 if (c == 'y') {
365 def = 1;
366 break;
367 }
368 if (c == 'n') {
369 def = 0;
370 break;
371 }
372 }
373 if (def)
374 printf("y\n");
375 else {
376 printf("n\n");
377 errors_uncorrected = 1;
378 }
379 return def;
380}
381
382/*
383 * Make certain that we aren't checking a filesystem that is on a
384 * mounted partition. Code adapted from e2fsck, Copyright (C) 1993,
385 * 1994 Theodore Ts'o. Also licensed under GPL.
386 */
387static void check_mount(void)
388{
389 if (find_mount_point(device_name, 0)) {
390 int cont;
391#if ENABLE_FEATURE_MTAB_SUPPORT
392 /*
393 * If the root is mounted read-only, then /etc/mtab is
394 * probably not correct; so we won't issue a warning based on
395 * it.
396 */
397 int fd = open(bb_path_mtab_file, O_RDWR);
398
399 if (fd < 0 && errno == EROFS)
400 return;
401 close(fd);
402#endif
403 printf("%s is mounted. ", device_name);
404 cont = 0;
405 if (isatty(0) && isatty(1))
406 cont = ask("Do you really want to continue", 0);
407 if (!cont) {
408 printf("Check aborted\n");
409 exit(EXIT_SUCCESS);
410 }
411 }
412}
413
414/*
415 * check_zone_nr checks to see that *nr is a valid zone nr. If it
416 * isn't, it will possibly be repaired. Check_zone_nr sets *corrected
417 * if an error was corrected, and returns the zone (0 for no zone
418 * or a bad zone-number).
419 */
420static int check_zone_nr2(uint32_t *nr, smallint *corrected)
421{
422 const char *msg;
423 if (!*nr)
424 return 0;
425 if (*nr < FIRSTZONE)
426 msg = "< FIRSTZONE";
427 else if (*nr >= ZONES)
428 msg = ">= ZONES";
429 else
430 return *nr;
431 printf("Zone nr %s in file '%s'. ", msg, current_name);
432 if (ask("Remove block", 1)) {
433 *nr = 0;
434 *corrected = 1;
435 }
436 return 0;
437}
438
439static int check_zone_nr(uint16_t *nr, smallint *corrected)
440{
441 uint32_t nr32 = *nr;
442 int r = check_zone_nr2(&nr32, corrected);
443 *nr = (uint16_t)nr32;
444 return r;
445}
446
447/*
448 * read-block reads block nr into the buffer at addr.
449 */
450static void read_block(unsigned nr, void *addr)
451{
452 if (!nr) {
453 memset(addr, 0, BLOCK_SIZE);
454 return;
455 }
456 xlseek(dev_fd, BLOCK_SIZE * nr, SEEK_SET);
457 if (BLOCK_SIZE != full_read(dev_fd, addr, BLOCK_SIZE)) {
458 printf("%s: bad block %u in file '%s'\n",
459 bb_msg_read_error, nr, current_name);
460 errors_uncorrected = 1;
461 memset(addr, 0, BLOCK_SIZE);
462 }
463}
464
465/*
466 * write_block writes block nr to disk.
467 */
468static void write_block(unsigned nr, void *addr)
469{
470 if (!nr)
471 return;
472 if (nr < FIRSTZONE || nr >= ZONES) {
473 printf("Internal error: trying to write bad block\n"
474 "Write request ignored\n");
475 errors_uncorrected = 1;
476 return;
477 }
478 xlseek(dev_fd, BLOCK_SIZE * nr, SEEK_SET);
479 if (BLOCK_SIZE != full_write(dev_fd, addr, BLOCK_SIZE)) {
480 printf("%s: bad block %u in file '%s'\n",
481 bb_msg_write_error, nr, current_name);
482 errors_uncorrected = 1;
483 }
484}
485
486/*
487 * map_block calculates the absolute block nr of a block in a file.
488 * It sets 'changed' if the inode has needed changing, and re-writes
489 * any indirect blocks with errors.
490 */
491static int map_block(struct minix1_inode *inode, unsigned blknr)
492{
493 uint16_t ind[BLOCK_SIZE >> 1];
494 int block, result;
495 smallint blk_chg;
496
497 if (blknr < 7)
498 return check_zone_nr(inode->i_zone + blknr, &changed);
499 blknr -= 7;
500 if (blknr < 512) {
501 block = check_zone_nr(inode->i_zone + 7, &changed);
502 goto common;
503 }
504 blknr -= 512;
505 block = check_zone_nr(inode->i_zone + 8, &changed);
506 read_block(block, ind); /* double indirect */
507 blk_chg = 0;
508 result = check_zone_nr(&ind[blknr / 512], &blk_chg);
509 if (blk_chg)
510 write_block(block, ind);
511 block = result;
512 common:
513 read_block(block, ind);
514 blk_chg = 0;
515 result = check_zone_nr(&ind[blknr % 512], &blk_chg);
516 if (blk_chg)
517 write_block(block, ind);
518 return result;
519}
520
521#if ENABLE_FEATURE_MINIX2
522static int map_block2(struct minix2_inode *inode, unsigned blknr)
523{
524 uint32_t ind[BLOCK_SIZE >> 2];
525 int block, result;
526 smallint blk_chg;
527
528 if (blknr < 7)
529 return check_zone_nr2(inode->i_zone + blknr, &changed);
530 blknr -= 7;
531 if (blknr < 256) {
532 block = check_zone_nr2(inode->i_zone + 7, &changed);
533 goto common2;
534 }
535 blknr -= 256;
536 if (blknr < 256 * 256) {
537 block = check_zone_nr2(inode->i_zone + 8, &changed);
538 goto common1;
539 }
540 blknr -= 256 * 256;
541 block = check_zone_nr2(inode->i_zone + 9, &changed);
542 read_block(block, ind); /* triple indirect */
543 blk_chg = 0;
544 result = check_zone_nr2(&ind[blknr / (256 * 256)], &blk_chg);
545 if (blk_chg)
546 write_block(block, ind);
547 block = result;
548 common1:
549 read_block(block, ind); /* double indirect */
550 blk_chg = 0;
551 result = check_zone_nr2(&ind[(blknr / 256) % 256], &blk_chg);
552 if (blk_chg)
553 write_block(block, ind);
554 block = result;
555 common2:
556 read_block(block, ind);
557 blk_chg = 0;
558 result = check_zone_nr2(&ind[blknr % 256], &blk_chg);
559 if (blk_chg)
560 write_block(block, ind);
561 return result;
562}
563#endif
564
565static void write_superblock(void)
566{
567 /*
568 * Set the state of the filesystem based on whether or not there
569 * are uncorrected errors. The filesystem valid flag is
570 * unconditionally set if we get this far.
571 */
572 Super.s_state |= MINIX_VALID_FS | MINIX_ERROR_FS;
573 if (!errors_uncorrected)
574 Super.s_state &= ~MINIX_ERROR_FS;
575
576 xlseek(dev_fd, BLOCK_SIZE, SEEK_SET);
577 if (BLOCK_SIZE != full_write(dev_fd, superblock_buffer, BLOCK_SIZE))
578 die("can't write superblock");
579}
580
581static void write_tables(void)
582{
583 write_superblock();
584
585 if (IMAPS * BLOCK_SIZE != write(dev_fd, inode_map, IMAPS * BLOCK_SIZE))
586 die("can't write inode map");
587 if (ZMAPS * BLOCK_SIZE != write(dev_fd, zone_map, ZMAPS * BLOCK_SIZE))
588 die("can't write zone map");
589 if (INODE_BUFFER_SIZE != write(dev_fd, inode_buffer, INODE_BUFFER_SIZE))
590 die("can't write inodes");
591}
592
593static void get_dirsize(void)
594{
595 int block;
596 char blk[BLOCK_SIZE];
597 int size;
598
599#if ENABLE_FEATURE_MINIX2
600 if (version2)
601 block = Inode2[MINIX_ROOT_INO].i_zone[0];
602 else
603#endif
604 block = Inode1[MINIX_ROOT_INO].i_zone[0];
605 read_block(block, blk);
606 for (size = 16; size < BLOCK_SIZE; size <<= 1) {
607 if (strcmp(blk + size + 2, "..") == 0) {
608 dirsize = size;
609 namelen = size - 2;
610 return;
611 }
612 }
613 /* use defaults */
614}
615
616static void read_superblock(void)
617{
618 xlseek(dev_fd, BLOCK_SIZE, SEEK_SET);
619 if (BLOCK_SIZE != full_read(dev_fd, superblock_buffer, BLOCK_SIZE))
620 die("can't read superblock");
621 /* already initialized to:
622 namelen = 14;
623 dirsize = 16;
624 version2 = 0;
625 */
626 if (MAGIC == MINIX1_SUPER_MAGIC) {
627 } else if (MAGIC == MINIX1_SUPER_MAGIC2) {
628 namelen = 30;
629 dirsize = 32;
630#if ENABLE_FEATURE_MINIX2
631 } else if (MAGIC == MINIX2_SUPER_MAGIC) {
632 version2 = 1;
633 } else if (MAGIC == MINIX2_SUPER_MAGIC2) {
634 namelen = 30;
635 dirsize = 32;
636 version2 = 1;
637#endif
638 } else
639 die("bad magic number in superblock");
640 if (ZONESIZE != 0 || BLOCK_SIZE != 1024)
641 die("only 1k blocks/zones supported");
642 if (IMAPS * BLOCK_SIZE * 8 < INODES + 1)
643 die("bad s_imap_blocks field in superblock");
644 if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1)
645 die("bad s_zmap_blocks field in superblock");
646}
647
648static void read_tables(void)
649{
650 inode_map = xzalloc(IMAPS * BLOCK_SIZE);
651 zone_map = xzalloc(ZMAPS * BLOCK_SIZE);
652 inode_buffer = xmalloc(INODE_BUFFER_SIZE);
653 inode_count = xmalloc(INODES + 1);
654 zone_count = xmalloc(ZONES);
655 if (IMAPS * BLOCK_SIZE != read(dev_fd, inode_map, IMAPS * BLOCK_SIZE))
656 die("can't read inode map");
657 if (ZMAPS * BLOCK_SIZE != read(dev_fd, zone_map, ZMAPS * BLOCK_SIZE))
658 die("can't read zone map");
659 if (INODE_BUFFER_SIZE != read(dev_fd, inode_buffer, INODE_BUFFER_SIZE))
660 die("can't read inodes");
661 if (NORM_FIRSTZONE != FIRSTZONE) {
662 printf("warning: firstzone!=norm_firstzone\n");
663 errors_uncorrected = 1;
664 }
665 get_dirsize();
666 if (OPT_show) {
667 printf("%u inodes\n"
668 "%u blocks\n"
669 "Firstdatazone=%u (%u)\n"
670 "Zonesize=%u\n"
671 "Maxsize=%u\n"
672 "Filesystem state=%u\n"
673 "namelen=%u\n\n",
674 INODES,
675 ZONES,
676 FIRSTZONE, NORM_FIRSTZONE,
677 BLOCK_SIZE << ZONESIZE,
678 MAXSIZE,
679 Super.s_state,
680 namelen);
681 }
682}
683
684static void get_inode_common(unsigned nr, uint16_t i_mode)
685{
686 total++;
687 if (!inode_count[nr]) {
688 if (!inode_in_use(nr)) {
689 printf("Inode %d is marked as 'unused', but it is used "
690 "for file '%s'\n", nr, current_name);
691 if (OPT_repair) {
692 if (ask("Mark as 'in use'", 1))
693 mark_inode(nr);
694 else
695 errors_uncorrected = 1;
696 }
697 }
698 if (S_ISDIR(i_mode))
699 directory++;
700 else if (S_ISREG(i_mode))
701 regular++;
702 else if (S_ISCHR(i_mode))
703 chardev++;
704 else if (S_ISBLK(i_mode))
705 blockdev++;
706 else if (S_ISLNK(i_mode))
707 symlinks++;
708 else if (S_ISSOCK(i_mode));
709 else if (S_ISFIFO(i_mode));
710 else {
711 printf("%s has mode %05o\n", current_name, i_mode);
712 }
713 } else
714 links++;
715 if (!++inode_count[nr]) {
716 printf("Warning: inode count too big\n");
717 inode_count[nr]--;
718 errors_uncorrected = 1;
719 }
720}
721
722static struct minix1_inode *get_inode(unsigned nr)
723{
724 struct minix1_inode *inode;
725
726 if (!nr || nr > INODES)
727 return NULL;
728 inode = Inode1 + nr;
729 get_inode_common(nr, inode->i_mode);
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 inode = Inode2 + nr;
741 get_inode_common(nr, inode->i_mode);
742 return inode;
743}
744#endif
745
746static void check_root(void)
747{
748 struct minix1_inode *inode = Inode1 + MINIX_ROOT_INO;
749
750 if (!inode || !S_ISDIR(inode->i_mode))
751 die("root inode isn't a directory");
752}
753
754#if ENABLE_FEATURE_MINIX2
755static void check_root2(void)
756{
757 struct minix2_inode *inode = Inode2 + MINIX_ROOT_INO;
758
759 if (!inode || !S_ISDIR(inode->i_mode))
760 die("root inode isn't a directory");
761}
762#else
763void check_root2(void);
764#endif
765
766static int add_zone_common(int block, smallint *corrected)
767{
768 if (!block)
769 return 0;
770 if (zone_count[block]) {
771 printf("Already used block is reused in file '%s'. ",
772 current_name);
773 if (ask("Clear", 1)) {
774 block = 0;
775 *corrected = 1;
776 return -1; /* "please zero out *znr" */
777 }
778 }
779 if (!zone_in_use(block)) {
780 printf("Block %d in file '%s' is marked as 'unused'. ",
781 block, current_name);
782 if (ask("Correct", 1))
783 mark_zone(block);
784 }
785 if (!++zone_count[block])
786 zone_count[block]--;
787 return block;
788}
789
790static int add_zone(uint16_t *znr, smallint *corrected)
791{
792 int block;
793
794 block = check_zone_nr(znr, corrected);
795 block = add_zone_common(block, corrected);
796 if (block == -1) {
797 *znr = 0;
798 block = 0;
799 }
800 return block;
801}
802
803#if ENABLE_FEATURE_MINIX2
804static int add_zone2(uint32_t *znr, smallint *corrected)
805{
806 int block;
807
808 block = check_zone_nr2(znr, corrected);
809 block = add_zone_common(block, corrected);
810 if (block == -1) {
811 *znr = 0;
812 block = 0;
813 }
814 return block;
815}
816#endif
817
818static void add_zone_ind(uint16_t *znr, smallint *corrected)
819{
820 int i;
821 int block;
822 smallint chg_blk = 0;
823
824 block = add_zone(znr, corrected);
825 if (!block)
826 return;
827 read_block(block, add_zone_ind_blk);
828 for (i = 0; i < (BLOCK_SIZE >> 1); i++)
829 add_zone(i + (uint16_t *) add_zone_ind_blk, &chg_blk);
830 if (chg_blk)
831 write_block(block, add_zone_ind_blk);
832}
833
834#if ENABLE_FEATURE_MINIX2
835static void add_zone_ind2(uint32_t *znr, smallint *corrected)
836{
837 int i;
838 int block;
839 smallint chg_blk = 0;
840
841 block = add_zone2(znr, corrected);
842 if (!block)
843 return;
844 read_block(block, add_zone_ind_blk);
845 for (i = 0; i < BLOCK_SIZE >> 2; i++)
846 add_zone2(i + (uint32_t *) add_zone_ind_blk, &chg_blk);
847 if (chg_blk)
848 write_block(block, add_zone_ind_blk);
849}
850#endif
851
852static void add_zone_dind(uint16_t *znr, smallint *corrected)
853{
854 int i;
855 int block;
856 smallint chg_blk = 0;
857
858 block = add_zone(znr, corrected);
859 if (!block)
860 return;
861 read_block(block, add_zone_dind_blk);
862 for (i = 0; i < (BLOCK_SIZE >> 1); i++)
863 add_zone_ind(i + (uint16_t *) add_zone_dind_blk, &chg_blk);
864 if (chg_blk)
865 write_block(block, add_zone_dind_blk);
866}
867
868#if ENABLE_FEATURE_MINIX2
869static void add_zone_dind2(uint32_t *znr, smallint *corrected)
870{
871 int i;
872 int block;
873 smallint chg_blk = 0;
874
875 block = add_zone2(znr, corrected);
876 if (!block)
877 return;
878 read_block(block, add_zone_dind_blk);
879 for (i = 0; i < BLOCK_SIZE >> 2; i++)
880 add_zone_ind2(i + (uint32_t *) add_zone_dind_blk, &chg_blk);
881 if (chg_blk)
882 write_block(block, add_zone_dind_blk);
883}
884
885static void add_zone_tind2(uint32_t *znr, smallint *corrected)
886{
887 int i;
888 int block;
889 smallint chg_blk = 0;
890
891 block = add_zone2(znr, corrected);
892 if (!block)
893 return;
894 read_block(block, add_zone_tind_blk);
895 for (i = 0; i < BLOCK_SIZE >> 2; i++)
896 add_zone_dind2(i + (uint32_t *) add_zone_tind_blk, &chg_blk);
897 if (chg_blk)
898 write_block(block, add_zone_tind_blk);
899}
900#endif
901
902static void check_zones(unsigned i)
903{
904 struct minix1_inode *inode;
905
906 if (!i || i > INODES)
907 return;
908 if (inode_count[i] > 1) /* have we counted this file already? */
909 return;
910 inode = Inode1 + i;
911 if (!S_ISDIR(inode->i_mode)
912 && !S_ISREG(inode->i_mode)
913 && !S_ISLNK(inode->i_mode)
914 ) {
915 return;
916 }
917 for (i = 0; i < 7; i++)
918 add_zone(i + inode->i_zone, &changed);
919 add_zone_ind(7 + inode->i_zone, &changed);
920 add_zone_dind(8 + inode->i_zone, &changed);
921}
922
923#if ENABLE_FEATURE_MINIX2
924static void check_zones2(unsigned i)
925{
926 struct minix2_inode *inode;
927
928 if (!i || i > INODES)
929 return;
930 if (inode_count[i] > 1) /* have we counted this file already? */
931 return;
932 inode = Inode2 + i;
933 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode)
934 && !S_ISLNK(inode->i_mode))
935 return;
936 for (i = 0; i < 7; i++)
937 add_zone2(i + inode->i_zone, &changed);
938 add_zone_ind2(7 + inode->i_zone, &changed);
939 add_zone_dind2(8 + inode->i_zone, &changed);
940 add_zone_tind2(9 + inode->i_zone, &changed);
941}
942#endif
943
944static void check_file(struct minix1_inode *dir, unsigned offset)
945{
946 struct minix1_inode *inode;
947 int ino;
948 char *name;
949 int block;
950
951 block = map_block(dir, offset / BLOCK_SIZE);
952 read_block(block, check_file_blk);
953 name = check_file_blk + (offset % BLOCK_SIZE) + 2;
954 ino = *(uint16_t *) (name - 2);
955 if (ino > INODES) {
956 printf("%s contains a bad inode number for file '%.*s'. ",
957 current_name, namelen, name);
958 if (ask("Remove", 1)) {
959 *(uint16_t *) (name - 2) = 0;
960 write_block(block, check_file_blk);
961 }
962 ino = 0;
963 }
964 push_filename(name);
965 inode = get_inode(ino);
966 pop_filename();
967 if (!offset) {
968 if (inode && LONE_CHAR(name, '.'))
969 return;
970 printf("%s: bad directory: '.' isn't first\n", current_name);
971 errors_uncorrected = 1;
972 }
973 if (offset == dirsize) {
974 if (inode && strcmp("..", name) == 0)
975 return;
976 printf("%s: bad directory: '..' isn't second\n", current_name);
977 errors_uncorrected = 1;
978 }
979 if (!inode)
980 return;
981 push_filename(name);
982 if (OPT_list) {
983 if (OPT_verbose)
984 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks);
985 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : "");
986 }
987 check_zones(ino);
988 if (inode && S_ISDIR(inode->i_mode))
989 recursive_check(ino);
990 pop_filename();
991}
992
993#if ENABLE_FEATURE_MINIX2
994static void check_file2(struct minix2_inode *dir, unsigned offset)
995{
996 struct minix2_inode *inode;
997 int ino;
998 char *name;
999 int block;
1000
1001 block = map_block2(dir, offset / BLOCK_SIZE);
1002 read_block(block, check_file_blk);
1003 name = check_file_blk + (offset % BLOCK_SIZE) + 2;
1004 ino = *(uint16_t *) (name - 2);
1005 if (ino > INODES) {
1006 printf("%s contains a bad inode number for file '%.*s'. ",
1007 current_name, namelen, name);
1008 if (ask("Remove", 1)) {
1009 *(uint16_t *) (name - 2) = 0;
1010 write_block(block, check_file_blk);
1011 }
1012 ino = 0;
1013 }
1014 push_filename(name);
1015 inode = get_inode2(ino);
1016 pop_filename();
1017 if (!offset) {
1018 if (inode && LONE_CHAR(name, '.'))
1019 return;
1020 printf("%s: bad directory: '.' isn't first\n", current_name);
1021 errors_uncorrected = 1;
1022 }
1023 if (offset == dirsize) {
1024 if (inode && strcmp("..", name) == 0)
1025 return;
1026 printf("%s: bad directory: '..' isn't second\n", current_name);
1027 errors_uncorrected = 1;
1028 }
1029 if (!inode)
1030 return;
1031 push_filename(name);
1032 if (OPT_list) {
1033 if (OPT_verbose)
1034 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks);
1035 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : "");
1036 }
1037 check_zones2(ino);
1038 if (inode && S_ISDIR(inode->i_mode))
1039 recursive_check2(ino);
1040 pop_filename();
1041}
1042#endif
1043
1044static void recursive_check(unsigned ino)
1045{
1046 struct minix1_inode *dir;
1047 unsigned offset;
1048
1049 dir = Inode1 + ino;
1050 if (!S_ISDIR(dir->i_mode))
1051 die("internal error");
1052 if (dir->i_size < 2 * dirsize) {
1053 printf("%s: bad directory: size<32", current_name);
1054 errors_uncorrected = 1;
1055 }
1056 for (offset = 0; offset < dir->i_size; offset += dirsize)
1057 check_file(dir, offset);
1058}
1059
1060#if ENABLE_FEATURE_MINIX2
1061static void recursive_check2(unsigned ino)
1062{
1063 struct minix2_inode *dir;
1064 unsigned offset;
1065
1066 dir = Inode2 + ino;
1067 if (!S_ISDIR(dir->i_mode))
1068 die("internal error");
1069 if (dir->i_size < 2 * dirsize) {
1070 printf("%s: bad directory: size<32", current_name);
1071 errors_uncorrected = 1;
1072 }
1073 for (offset = 0; offset < dir->i_size; offset += dirsize)
1074 check_file2(dir, offset);
1075}
1076#endif
1077
1078static int bad_zone(int i)
1079{
1080 char buffer[BLOCK_SIZE];
1081
1082 xlseek(dev_fd, BLOCK_SIZE * i, SEEK_SET);
1083 return (BLOCK_SIZE != full_read(dev_fd, buffer, BLOCK_SIZE));
1084}
1085
1086static void check_counts(void)
1087{
1088 int i;
1089
1090 for (i = 1; i <= INODES; i++) {
1091 if (OPT_warn_mode && Inode1[i].i_mode && !inode_in_use(i)) {
1092 printf("Inode %d has non-zero mode. ", i);
1093 if (ask("Clear", 1)) {
1094 Inode1[i].i_mode = 0;
1095 changed = 1;
1096 }
1097 }
1098 if (!inode_count[i]) {
1099 if (!inode_in_use(i))
1100 continue;
1101 printf("Unused inode %d is marked as 'used' in the bitmap. ", i);
1102 if (ask("Clear", 1))
1103 unmark_inode(i);
1104 continue;
1105 }
1106 if (!inode_in_use(i)) {
1107 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i);
1108 if (ask("Set", 1))
1109 mark_inode(i);
1110 }
1111 if (Inode1[i].i_nlinks != inode_count[i]) {
1112 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ",
1113 i, Inode1[i].i_mode, Inode1[i].i_nlinks,
1114 inode_count[i]);
1115 if (ask("Set i_nlinks to count", 1)) {
1116 Inode1[i].i_nlinks = inode_count[i];
1117 changed = 1;
1118 }
1119 }
1120 }
1121 for (i = FIRSTZONE; i < ZONES; i++) {
1122 if ((zone_in_use(i) != 0) == zone_count[i])
1123 continue;
1124 if (!zone_count[i]) {
1125 if (bad_zone(i))
1126 continue;
1127 printf("Zone %d is marked 'in use', but no file uses it. ", i);
1128 if (ask("Unmark", 1))
1129 unmark_zone(i);
1130 continue;
1131 }
1132 printf("Zone %d: %sin use, counted=%d\n",
1133 i, zone_in_use(i) ? "" : "not ", zone_count[i]);
1134 }
1135}
1136
1137#if ENABLE_FEATURE_MINIX2
1138static void check_counts2(void)
1139{
1140 int i;
1141
1142 for (i = 1; i <= INODES; i++) {
1143 if (OPT_warn_mode && Inode2[i].i_mode && !inode_in_use(i)) {
1144 printf("Inode %d has non-zero mode. ", i);
1145 if (ask("Clear", 1)) {
1146 Inode2[i].i_mode = 0;
1147 changed = 1;
1148 }
1149 }
1150 if (!inode_count[i]) {
1151 if (!inode_in_use(i))
1152 continue;
1153 printf("Unused inode %d is marked as 'used' in the bitmap. ", i);
1154 if (ask("Clear", 1))
1155 unmark_inode(i);
1156 continue;
1157 }
1158 if (!inode_in_use(i)) {
1159 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i);
1160 if (ask("Set", 1))
1161 mark_inode(i);
1162 }
1163 if (Inode2[i].i_nlinks != inode_count[i]) {
1164 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ",
1165 i, Inode2[i].i_mode, Inode2[i].i_nlinks,
1166 inode_count[i]);
1167 if (ask("Set i_nlinks to count", 1)) {
1168 Inode2[i].i_nlinks = inode_count[i];
1169 changed = 1;
1170 }
1171 }
1172 }
1173 for (i = FIRSTZONE; i < ZONES; i++) {
1174 if ((zone_in_use(i) != 0) == zone_count[i])
1175 continue;
1176 if (!zone_count[i]) {
1177 if (bad_zone(i))
1178 continue;
1179 printf("Zone %d is marked 'in use', but no file uses it. ", i);
1180 if (ask("Unmark", 1))
1181 unmark_zone(i);
1182 continue;
1183 }
1184 printf("Zone %d: %sin use, counted=%d\n",
1185 i, zone_in_use(i) ? "" : "not ", zone_count[i]);
1186 }
1187}
1188#endif
1189
1190static void check(void)
1191{
1192 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count));
1193 memset(zone_count, 0, ZONES * sizeof(*zone_count));
1194 check_zones(MINIX_ROOT_INO);
1195 recursive_check(MINIX_ROOT_INO);
1196 check_counts();
1197}
1198
1199#if ENABLE_FEATURE_MINIX2
1200static void check2(void)
1201{
1202 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count));
1203 memset(zone_count, 0, ZONES * sizeof(*zone_count));
1204 check_zones2(MINIX_ROOT_INO);
1205 recursive_check2(MINIX_ROOT_INO);
1206 check_counts2();
1207}
1208#else
1209void check2(void);
1210#endif
1211
1212int fsck_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1213int fsck_minix_main(int argc UNUSED_PARAM, char **argv)
1214{
1215 struct termios tmp;
1216 int retcode = 0;
1217
1218 xfunc_error_retval = 8;
1219
1220 INIT_G();
1221
1222 opt_complementary = "=1:ar"; /* one argument; -a assumes -r */
1223 getopt32(argv, OPTION_STR);
1224 argv += optind;
1225 device_name = argv[0];
1226
1227 check_mount(); /* trying to check a mounted filesystem? */
1228 if (OPT_manual) {
1229 if (!isatty(0) || !isatty(1))
1230 die("need terminal for interactive repairs");
1231 }
1232 xmove_fd(xopen(device_name, OPT_repair ? O_RDWR : O_RDONLY), dev_fd);
1233
1234 /*sync(); paranoia? */
1235 read_superblock();
1236
1237 /*
1238 * Determine whether or not we should continue with the checking.
1239 * This is based on the status of the filesystem valid and error
1240 * flags and whether or not the -f switch was specified on the
1241 * command line.
1242 */
1243 printf("%s: %s\n", applet_name, bb_banner);
1244
1245 if (!(Super.s_state & MINIX_ERROR_FS)
1246 && (Super.s_state & MINIX_VALID_FS) && !OPT_force
1247 ) {
1248 if (OPT_repair)
1249 printf("%s is clean, check is skipped\n", device_name);
1250 return 0;
1251 } else if (OPT_force)
1252 printf("Forcing filesystem check on %s\n", device_name);
1253 else if (OPT_repair)
1254 printf("Filesystem on %s is dirty, needs checking\n",
1255 device_name);
1256
1257 read_tables();
1258
1259 if (OPT_manual) {
1260 tcgetattr(0, &sv_termios);
1261 tmp = sv_termios;
1262 tmp.c_lflag &= ~(ICANON | ECHO);
1263 tcsetattr_stdin_TCSANOW(&tmp);
1264 termios_set = 1;
1265 }
1266
1267 if (version2) {
1268 check_root2();
1269 check2();
1270 } else {
1271 check_root();
1272 check();
1273 }
1274
1275 if (OPT_verbose) {
1276 int i, free_cnt;
1277
1278 for (i = 1, free_cnt = 0; i <= INODES; i++)
1279 if (!inode_in_use(i))
1280 free_cnt++;
1281 printf("\n%6u inodes used (%u%%)\n", (INODES - free_cnt),
1282 100 * (INODES - free_cnt) / INODES);
1283 for (i = FIRSTZONE, free_cnt = 0; i < ZONES; i++)
1284 if (!zone_in_use(i))
1285 free_cnt++;
1286 printf("%6u zones used (%u%%)\n\n"
1287 "%6u regular files\n"
1288 "%6u directories\n"
1289 "%6u character device files\n"
1290 "%6u block device files\n"
1291 "%6u links\n"
1292 "%6u symbolic links\n"
1293 "------\n"
1294 "%6u files\n",
1295 (ZONES - free_cnt), 100 * (ZONES - free_cnt) / ZONES,
1296 regular, directory, chardev, blockdev,
1297 links - 2 * directory + 1, symlinks,
1298 total - 2 * directory + 1);
1299 }
1300 if (changed) {
1301 write_tables();
1302 printf("FILE SYSTEM HAS BEEN CHANGED\n");
1303 sync();
1304 } else if (OPT_repair)
1305 write_superblock();
1306
1307 if (OPT_manual)
1308 tcsetattr_stdin_TCSANOW(&sv_termios);
1309
1310 if (changed)
1311 retcode += 3;
1312 if (errors_uncorrected)
1313 retcode += 4;
1314 return retcode;
1315}
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