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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//config:config FSCK_MINIX
89//config: bool "fsck_minix"
90//config: default y
91//config: help
92//config: The minix filesystem is a nice, small, compact, read-write filesystem
93//config: with little overhead. It is not a journaling filesystem however and
94//config: can experience corruption if it is not properly unmounted or if the
95//config: power goes off in the middle of a write. This utility allows you to
96//config: check for and attempt to repair any corruption that occurs to a minix
97//config: filesystem.
98
99//applet:IF_FSCK_MINIX(APPLET_ODDNAME(fsck.minix, fsck_minix, BB_DIR_SBIN, BB_SUID_DROP, fsck_minix))
100
101//kbuild:lib-$(CONFIG_FSCK_MINIX) += fsck_minix.o
102
103//usage:#define fsck_minix_trivial_usage
104//usage: "[-larvsmf] BLOCKDEV"
105//usage:#define fsck_minix_full_usage "\n\n"
106//usage: "Check MINIX filesystem\n"
107//usage: "\n -l List all filenames"
108//usage: "\n -r Perform interactive repairs"
109//usage: "\n -a Perform automatic repairs"
110//usage: "\n -v Verbose"
111//usage: "\n -s Output superblock information"
112//usage: "\n -m Show \"mode not cleared\" warnings"
113//usage: "\n -f Force file system check"
114
115#include <mntent.h>
116#include "libbb.h"
117#include "minix.h"
118
119#ifndef BLKGETSIZE
120#define BLKGETSIZE _IO(0x12,96) /* return device size */
121#endif
122
123struct BUG_bad_inode_size {
124 char BUG_bad_inode1_size[(INODE_SIZE1 * MINIX1_INODES_PER_BLOCK != BLOCK_SIZE) ? -1 : 1];
125#if ENABLE_FEATURE_MINIX2
126 char BUG_bad_inode2_size[(INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE) ? -1 : 1];
127#endif
128};
129
130enum {
131#ifdef UNUSED
132 MINIX1_LINK_MAX = 250,
133 MINIX2_LINK_MAX = 65530,
134 MINIX_I_MAP_SLOTS = 8,
135 MINIX_Z_MAP_SLOTS = 64,
136 MINIX_V1 = 0x0001, /* original minix fs */
137 MINIX_V2 = 0x0002, /* minix V2 fs */
138#endif
139 MINIX_NAME_MAX = 255, /* # chars in a file name */
140};
141
142
143#if !ENABLE_FEATURE_MINIX2
144enum { version2 = 0 };
145#endif
146
147enum { MAX_DEPTH = 32 };
148
149enum { dev_fd = 3 };
150
151struct globals {
152#if ENABLE_FEATURE_MINIX2
153 smallint version2;
154#endif
155 smallint changed; /* is filesystem modified? */
156 smallint errors_uncorrected; /* flag if some error was not corrected */
157 smallint termios_set;
158 smallint dirsize;
159 smallint namelen;
160 const char *device_name;
161 int directory, regular, blockdev, chardev, links, symlinks, total;
162 char *inode_buffer;
163
164 char *inode_map;
165 char *zone_map;
166
167 unsigned char *inode_count;
168 unsigned char *zone_count;
169
170 /* File-name data */
171 int name_depth;
172 char *name_component[MAX_DEPTH+1];
173
174 /* Bigger stuff */
175 struct termios sv_termios;
176 char superblock_buffer[BLOCK_SIZE];
177 char add_zone_ind_blk[BLOCK_SIZE];
178 char add_zone_dind_blk[BLOCK_SIZE];
179 IF_FEATURE_MINIX2(char add_zone_tind_blk[BLOCK_SIZE];)
180 char check_file_blk[BLOCK_SIZE];
181
182 /* File-name data */
183 char current_name[MAX_DEPTH * MINIX_NAME_MAX];
184};
185#define G (*ptr_to_globals)
186#if ENABLE_FEATURE_MINIX2
187#define version2 (G.version2 )
188#endif
189#define changed (G.changed )
190#define errors_uncorrected (G.errors_uncorrected )
191#define termios_set (G.termios_set )
192#define dirsize (G.dirsize )
193#define namelen (G.namelen )
194#define device_name (G.device_name )
195#define directory (G.directory )
196#define regular (G.regular )
197#define blockdev (G.blockdev )
198#define chardev (G.chardev )
199#define links (G.links )
200#define symlinks (G.symlinks )
201#define total (G.total )
202#define inode_buffer (G.inode_buffer )
203#define inode_map (G.inode_map )
204#define zone_map (G.zone_map )
205#define inode_count (G.inode_count )
206#define zone_count (G.zone_count )
207#define name_depth (G.name_depth )
208#define name_component (G.name_component )
209#define sv_termios (G.sv_termios )
210#define superblock_buffer (G.superblock_buffer )
211#define add_zone_ind_blk (G.add_zone_ind_blk )
212#define add_zone_dind_blk (G.add_zone_dind_blk )
213#define add_zone_tind_blk (G.add_zone_tind_blk )
214#define check_file_blk (G.check_file_blk )
215#define current_name (G.current_name )
216#define INIT_G() do { \
217 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
218 dirsize = 16; \
219 namelen = 14; \
220 current_name[0] = '/'; \
221 /*current_name[1] = '\0';*/ \
222 name_component[0] = &current_name[0]; \
223} while (0)
224
225
226#define OPTION_STR "larvsmf"
227enum {
228 OPT_l = (1 << 0),
229 OPT_a = (1 << 1),
230 OPT_r = (1 << 2),
231 OPT_v = (1 << 3),
232 OPT_s = (1 << 4),
233 OPT_w = (1 << 5),
234 OPT_f = (1 << 6),
235};
236#define OPT_list (option_mask32 & OPT_l)
237#define OPT_automatic (option_mask32 & OPT_a)
238#define OPT_repair (option_mask32 & OPT_r)
239#define OPT_verbose (option_mask32 & OPT_v)
240#define OPT_show (option_mask32 & OPT_s)
241#define OPT_warn_mode (option_mask32 & OPT_w)
242#define OPT_force (option_mask32 & OPT_f)
243/* non-automatic repairs requested? */
244#define OPT_manual ((option_mask32 & (OPT_a|OPT_r)) == OPT_r)
245
246
247#define Inode1 (((struct minix1_inode *) inode_buffer)-1)
248#define Inode2 (((struct minix2_inode *) inode_buffer)-1)
249
250#define Super (*(struct minix_superblock *)(superblock_buffer))
251
252#if ENABLE_FEATURE_MINIX2
253# define ZONES ((unsigned)(version2 ? Super.s_zones : Super.s_nzones))
254#else
255# define ZONES ((unsigned)(Super.s_nzones))
256#endif
257#define INODES ((unsigned)Super.s_ninodes)
258#define IMAPS ((unsigned)Super.s_imap_blocks)
259#define ZMAPS ((unsigned)Super.s_zmap_blocks)
260#define FIRSTZONE ((unsigned)Super.s_firstdatazone)
261#define ZONESIZE ((unsigned)Super.s_log_zone_size)
262#define MAXSIZE ((unsigned)Super.s_max_size)
263#define MAGIC (Super.s_magic)
264
265/* gcc likes this more (code is smaller) than macro variant */
266static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n)
267{
268 return (size + n-1) / n;
269}
270
271#if !ENABLE_FEATURE_MINIX2
272#define INODE_BLOCKS div_roundup(INODES, MINIX1_INODES_PER_BLOCK)
273#else
274#define INODE_BLOCKS div_roundup(INODES, \
275 (version2 ? MINIX2_INODES_PER_BLOCK : MINIX1_INODES_PER_BLOCK))
276#endif
277
278#define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE)
279#define NORM_FIRSTZONE (2 + IMAPS + ZMAPS + INODE_BLOCKS)
280
281/* Before you ask "where they come from?": */
282/* setbit/clrbit are supplied by sys/param.h */
283
284static int minix_bit(const char *a, unsigned i)
285{
286 return (a[i >> 3] & (1<<(i & 7)));
287}
288
289static void minix_setbit(char *a, unsigned i)
290{
291 setbit(a, i);
292 changed = 1;
293}
294static void minix_clrbit(char *a, unsigned i)
295{
296 clrbit(a, i);
297 changed = 1;
298}
299
300/* Note: do not assume 0/1, it is 0/nonzero */
301#define zone_in_use(x) (minix_bit(zone_map,(x)-FIRSTZONE+1))
302#define inode_in_use(x) (minix_bit(inode_map,(x)))
303
304#define mark_inode(x) (minix_setbit(inode_map,(x)))
305#define unmark_inode(x) (minix_clrbit(inode_map,(x)))
306
307#define mark_zone(x) (minix_setbit(zone_map,(x)-FIRSTZONE+1))
308#define unmark_zone(x) (minix_clrbit(zone_map,(x)-FIRSTZONE+1))
309
310
311static void recursive_check(unsigned ino);
312#if ENABLE_FEATURE_MINIX2
313static void recursive_check2(unsigned ino);
314#endif
315
316static void die(const char *str) NORETURN;
317static void die(const char *str)
318{
319 if (termios_set)
320 tcsetattr_stdin_TCSANOW(&sv_termios);
321 bb_error_msg_and_die("%s", str);
322}
323
324static void push_filename(const char *name)
325{
326 // /dir/dir/dir/file
327 // ^ ^ ^
328 // [0] [1] [2] <-name_component[i]
329 if (name_depth < MAX_DEPTH) {
330 int len;
331 char *p = name_component[name_depth];
332 *p++ = '/';
333 len = sprintf(p, "%.*s", namelen, name);
334 name_component[name_depth + 1] = p + len;
335 }
336 name_depth++;
337}
338
339static void pop_filename(void)
340{
341 name_depth--;
342 if (name_depth < MAX_DEPTH) {
343 *name_component[name_depth] = '\0';
344 if (!name_depth) {
345 current_name[0] = '/';
346 current_name[1] = '\0';
347 }
348 }
349}
350
351static int ask(const char *string, int def)
352{
353 int c;
354
355 if (!OPT_repair) {
356 bb_putchar('\n');
357 errors_uncorrected = 1;
358 return 0;
359 }
360 if (OPT_automatic) {
361 bb_putchar('\n');
362 if (!def)
363 errors_uncorrected = 1;
364 return def;
365 }
366 printf(def ? "%s (y/n)? " : "%s (n/y)? ", string);
367 for (;;) {
368 fflush_all();
369 c = getchar();
370 if (c == EOF) {
371 if (!def)
372 errors_uncorrected = 1;
373 return def;
374 }
375 if (c == '\n')
376 break;
377 c |= 0x20; /* tolower */
378 if (c == 'y') {
379 def = 1;
380 break;
381 }
382 if (c == 'n') {
383 def = 0;
384 break;
385 }
386 }
387 if (def)
388 puts("y");
389 else {
390 puts("n");
391 errors_uncorrected = 1;
392 }
393 return def;
394}
395
396/*
397 * Make certain that we aren't checking a filesystem that is on a
398 * mounted partition. Code adapted from e2fsck, Copyright (C) 1993,
399 * 1994 Theodore Ts'o. Also licensed under GPL.
400 */
401static void check_mount(void)
402{
403 if (find_mount_point(device_name, 0)) {
404 int cont;
405#if ENABLE_FEATURE_MTAB_SUPPORT
406 /*
407 * If the root is mounted read-only, then /etc/mtab is
408 * probably not correct; so we won't issue a warning based on
409 * it.
410 */
411 int fd = open(bb_path_mtab_file, O_RDWR);
412
413 if (fd < 0 && errno == EROFS)
414 return;
415 close(fd);
416#endif
417 printf("%s is mounted. ", device_name);
418 cont = 0;
419 if (isatty(0) && isatty(1))
420 cont = ask("Do you really want to continue", 0);
421 if (!cont) {
422 puts("Check aborted");
423 exit(EXIT_SUCCESS);
424 }
425 }
426}
427
428/*
429 * check_zone_nr checks to see that *nr is a valid zone nr. If it
430 * isn't, it will possibly be repaired. Check_zone_nr sets *corrected
431 * if an error was corrected, and returns the zone (0 for no zone
432 * or a bad zone-number).
433 */
434static int check_zone_nr2(uint32_t *nr, smallint *corrected)
435{
436 const char *msg;
437 if (!*nr)
438 return 0;
439 if (*nr < FIRSTZONE)
440 msg = "< FIRSTZONE";
441 else if (*nr >= ZONES)
442 msg = ">= ZONES";
443 else
444 return *nr;
445 printf("Zone nr %s in file '%s'. ", msg, current_name);
446 if (ask("Remove block", 1)) {
447 *nr = 0;
448 *corrected = 1;
449 }
450 return 0;
451}
452
453static int check_zone_nr(uint16_t *nr, smallint *corrected)
454{
455 uint32_t nr32 = *nr;
456 int r = check_zone_nr2(&nr32, corrected);
457 *nr = (uint16_t)nr32;
458 return r;
459}
460
461/*
462 * read-block reads block nr into the buffer at addr.
463 */
464static void read_block(unsigned nr, void *addr)
465{
466 if (!nr) {
467 memset(addr, 0, BLOCK_SIZE);
468 return;
469 }
470 xlseek(dev_fd, BLOCK_SIZE * nr, SEEK_SET);
471 if (BLOCK_SIZE != full_read(dev_fd, addr, BLOCK_SIZE)) {
472 printf("%s: bad block %u in file '%s'\n",
473 bb_msg_read_error, nr, current_name);
474 errors_uncorrected = 1;
475 memset(addr, 0, BLOCK_SIZE);
476 }
477}
478
479/*
480 * write_block writes block nr to disk.
481 */
482static void write_block(unsigned nr, void *addr)
483{
484 if (!nr)
485 return;
486 if (nr < FIRSTZONE || nr >= ZONES) {
487 puts("Internal error: trying to write bad block\n"
488 "Write request ignored");
489 errors_uncorrected = 1;
490 return;
491 }
492 xlseek(dev_fd, BLOCK_SIZE * nr, SEEK_SET);
493 if (BLOCK_SIZE != full_write(dev_fd, addr, BLOCK_SIZE)) {
494 printf("%s: bad block %u in file '%s'\n",
495 bb_msg_write_error, nr, current_name);
496 errors_uncorrected = 1;
497 }
498}
499
500/*
501 * map_block calculates the absolute block nr of a block in a file.
502 * It sets 'changed' if the inode has needed changing, and re-writes
503 * any indirect blocks with errors.
504 */
505static int map_block(struct minix1_inode *inode, unsigned blknr)
506{
507 uint16_t ind[BLOCK_SIZE >> 1];
508 int block, result;
509 smallint blk_chg;
510
511 if (blknr < 7)
512 return check_zone_nr(inode->i_zone + blknr, &changed);
513 blknr -= 7;
514 if (blknr < 512) {
515 block = check_zone_nr(inode->i_zone + 7, &changed);
516 goto common;
517 }
518 blknr -= 512;
519 block = check_zone_nr(inode->i_zone + 8, &changed);
520 read_block(block, ind); /* double indirect */
521 blk_chg = 0;
522 result = check_zone_nr(&ind[blknr / 512], &blk_chg);
523 if (blk_chg)
524 write_block(block, ind);
525 block = result;
526 common:
527 read_block(block, ind);
528 blk_chg = 0;
529 result = check_zone_nr(&ind[blknr % 512], &blk_chg);
530 if (blk_chg)
531 write_block(block, ind);
532 return result;
533}
534
535#if ENABLE_FEATURE_MINIX2
536static int map_block2(struct minix2_inode *inode, unsigned blknr)
537{
538 uint32_t ind[BLOCK_SIZE >> 2];
539 int block, result;
540 smallint blk_chg;
541
542 if (blknr < 7)
543 return check_zone_nr2(inode->i_zone + blknr, &changed);
544 blknr -= 7;
545 if (blknr < 256) {
546 block = check_zone_nr2(inode->i_zone + 7, &changed);
547 goto common2;
548 }
549 blknr -= 256;
550 if (blknr < 256 * 256) {
551 block = check_zone_nr2(inode->i_zone + 8, &changed);
552 goto common1;
553 }
554 blknr -= 256 * 256;
555 block = check_zone_nr2(inode->i_zone + 9, &changed);
556 read_block(block, ind); /* triple indirect */
557 blk_chg = 0;
558 result = check_zone_nr2(&ind[blknr / (256 * 256)], &blk_chg);
559 if (blk_chg)
560 write_block(block, ind);
561 block = result;
562 common1:
563 read_block(block, ind); /* double indirect */
564 blk_chg = 0;
565 result = check_zone_nr2(&ind[(blknr / 256) % 256], &blk_chg);
566 if (blk_chg)
567 write_block(block, ind);
568 block = result;
569 common2:
570 read_block(block, ind);
571 blk_chg = 0;
572 result = check_zone_nr2(&ind[blknr % 256], &blk_chg);
573 if (blk_chg)
574 write_block(block, ind);
575 return result;
576}
577#endif
578
579static void write_superblock(void)
580{
581 /*
582 * Set the state of the filesystem based on whether or not there
583 * are uncorrected errors. The filesystem valid flag is
584 * unconditionally set if we get this far.
585 */
586 Super.s_state |= MINIX_VALID_FS | MINIX_ERROR_FS;
587 if (!errors_uncorrected)
588 Super.s_state &= ~MINIX_ERROR_FS;
589
590 xlseek(dev_fd, BLOCK_SIZE, SEEK_SET);
591 if (BLOCK_SIZE != full_write(dev_fd, superblock_buffer, BLOCK_SIZE))
592 die("can't write superblock");
593}
594
595static void write_tables(void)
596{
597 write_superblock();
598
599 if (IMAPS * BLOCK_SIZE != write(dev_fd, inode_map, IMAPS * BLOCK_SIZE))
600 die("can't write inode map");
601 if (ZMAPS * BLOCK_SIZE != write(dev_fd, zone_map, ZMAPS * BLOCK_SIZE))
602 die("can't write zone map");
603 if (INODE_BUFFER_SIZE != write(dev_fd, inode_buffer, INODE_BUFFER_SIZE))
604 die("can't write inodes");
605}
606
607static void get_dirsize(void)
608{
609 int block;
610 char blk[BLOCK_SIZE];
611 int size;
612
613#if ENABLE_FEATURE_MINIX2
614 if (version2)
615 block = Inode2[MINIX_ROOT_INO].i_zone[0];
616 else
617#endif
618 block = Inode1[MINIX_ROOT_INO].i_zone[0];
619 read_block(block, blk);
620 for (size = 16; size < BLOCK_SIZE; size <<= 1) {
621 if (strcmp(blk + size + 2, "..") == 0) {
622 dirsize = size;
623 namelen = size - 2;
624 return;
625 }
626 }
627 /* use defaults */
628}
629
630static void read_superblock(void)
631{
632 xlseek(dev_fd, BLOCK_SIZE, SEEK_SET);
633 if (BLOCK_SIZE != full_read(dev_fd, superblock_buffer, BLOCK_SIZE))
634 die("can't read superblock");
635 /* already initialized to:
636 namelen = 14;
637 dirsize = 16;
638 version2 = 0;
639 */
640 if (MAGIC == MINIX1_SUPER_MAGIC) {
641 } else if (MAGIC == MINIX1_SUPER_MAGIC2) {
642 namelen = 30;
643 dirsize = 32;
644#if ENABLE_FEATURE_MINIX2
645 } else if (MAGIC == MINIX2_SUPER_MAGIC) {
646 version2 = 1;
647 } else if (MAGIC == MINIX2_SUPER_MAGIC2) {
648 namelen = 30;
649 dirsize = 32;
650 version2 = 1;
651#endif
652 } else
653 die("bad magic number in superblock");
654 if (ZONESIZE != 0 || BLOCK_SIZE != 1024)
655 die("only 1k blocks/zones supported");
656 if (IMAPS * BLOCK_SIZE * 8 < INODES + 1)
657 die("bad s_imap_blocks field in superblock");
658 if (ZMAPS * BLOCK_SIZE * 8 < ZONES - FIRSTZONE + 1)
659 die("bad s_zmap_blocks field in superblock");
660}
661
662static void read_tables(void)
663{
664 inode_map = xzalloc(IMAPS * BLOCK_SIZE);
665 zone_map = xzalloc(ZMAPS * BLOCK_SIZE);
666 inode_buffer = xmalloc(INODE_BUFFER_SIZE);
667 inode_count = xmalloc(INODES + 1);
668 zone_count = xmalloc(ZONES);
669 if (IMAPS * BLOCK_SIZE != read(dev_fd, inode_map, IMAPS * BLOCK_SIZE))
670 die("can't read inode map");
671 if (ZMAPS * BLOCK_SIZE != read(dev_fd, zone_map, ZMAPS * BLOCK_SIZE))
672 die("can't read zone map");
673 if (INODE_BUFFER_SIZE != read(dev_fd, inode_buffer, INODE_BUFFER_SIZE))
674 die("can't read inodes");
675 if (NORM_FIRSTZONE != FIRSTZONE) {
676 puts("warning: firstzone!=norm_firstzone");
677 errors_uncorrected = 1;
678 }
679 get_dirsize();
680 if (OPT_show) {
681 printf("%u inodes\n"
682 "%u blocks\n"
683 "Firstdatazone=%u (%u)\n"
684 "Zonesize=%u\n"
685 "Maxsize=%u\n"
686 "Filesystem state=%u\n"
687 "namelen=%u\n\n",
688 INODES,
689 ZONES,
690 FIRSTZONE, NORM_FIRSTZONE,
691 BLOCK_SIZE << ZONESIZE,
692 MAXSIZE,
693 Super.s_state,
694 namelen);
695 }
696}
697
698static void get_inode_common(unsigned nr, uint16_t i_mode)
699{
700 total++;
701 if (!inode_count[nr]) {
702 if (!inode_in_use(nr)) {
703 printf("Inode %u is marked as 'unused', but it is used "
704 "for file '%s'\n", nr, current_name);
705 if (OPT_repair) {
706 if (ask("Mark as 'in use'", 1))
707 mark_inode(nr);
708 else
709 errors_uncorrected = 1;
710 }
711 }
712 if (S_ISDIR(i_mode))
713 directory++;
714 else if (S_ISREG(i_mode))
715 regular++;
716 else if (S_ISCHR(i_mode))
717 chardev++;
718 else if (S_ISBLK(i_mode))
719 blockdev++;
720 else if (S_ISLNK(i_mode))
721 symlinks++;
722 else if (S_ISSOCK(i_mode));
723 else if (S_ISFIFO(i_mode));
724 else {
725 printf("%s has mode %05o\n", current_name, i_mode);
726 }
727 } else
728 links++;
729 if (!++inode_count[nr]) {
730 puts("Warning: inode count too big");
731 inode_count[nr]--;
732 errors_uncorrected = 1;
733 }
734}
735
736static struct minix1_inode *get_inode(unsigned nr)
737{
738 struct minix1_inode *inode;
739
740 if (!nr || nr > INODES)
741 return NULL;
742 inode = Inode1 + nr;
743 get_inode_common(nr, inode->i_mode);
744 return inode;
745}
746
747#if ENABLE_FEATURE_MINIX2
748static struct minix2_inode *get_inode2(unsigned nr)
749{
750 struct minix2_inode *inode;
751
752 if (!nr || nr > INODES)
753 return NULL;
754 inode = Inode2 + nr;
755 get_inode_common(nr, inode->i_mode);
756 return inode;
757}
758#endif
759
760static void check_root(void)
761{
762 struct minix1_inode *inode = Inode1 + MINIX_ROOT_INO;
763
764 if (!inode || !S_ISDIR(inode->i_mode))
765 die("root inode isn't a directory");
766}
767
768#if ENABLE_FEATURE_MINIX2
769static void check_root2(void)
770{
771 struct minix2_inode *inode = Inode2 + MINIX_ROOT_INO;
772
773 if (!inode || !S_ISDIR(inode->i_mode))
774 die("root inode isn't a directory");
775}
776#else
777void check_root2(void);
778#endif
779
780static int add_zone_common(int block, smallint *corrected)
781{
782 if (!block)
783 return 0;
784 if (zone_count[block]) {
785 printf("Already used block is reused in file '%s'. ",
786 current_name);
787 if (ask("Clear", 1)) {
788 block = 0;
789 *corrected = 1;
790 return -1; /* "please zero out *znr" */
791 }
792 }
793 if (!zone_in_use(block)) {
794 printf("Block %d in file '%s' is marked as 'unused'. ",
795 block, current_name);
796 if (ask("Correct", 1))
797 mark_zone(block);
798 }
799 if (!++zone_count[block])
800 zone_count[block]--;
801 return block;
802}
803
804static int add_zone(uint16_t *znr, smallint *corrected)
805{
806 int block;
807
808 block = check_zone_nr(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
817#if ENABLE_FEATURE_MINIX2
818static int add_zone2(uint32_t *znr, smallint *corrected)
819{
820 int block;
821
822 block = check_zone_nr2(znr, corrected);
823 block = add_zone_common(block, corrected);
824 if (block == -1) {
825 *znr = 0;
826 block = 0;
827 }
828 return block;
829}
830#endif
831
832static void add_zone_ind(uint16_t *znr, smallint *corrected)
833{
834 int i;
835 int block;
836 smallint chg_blk = 0;
837
838 block = add_zone(znr, corrected);
839 if (!block)
840 return;
841 read_block(block, add_zone_ind_blk);
842 for (i = 0; i < (BLOCK_SIZE >> 1); i++)
843 add_zone(i + (uint16_t *) add_zone_ind_blk, &chg_blk);
844 if (chg_blk)
845 write_block(block, add_zone_ind_blk);
846}
847
848#if ENABLE_FEATURE_MINIX2
849static void add_zone_ind2(uint32_t *znr, smallint *corrected)
850{
851 int i;
852 int block;
853 smallint chg_blk = 0;
854
855 block = add_zone2(znr, corrected);
856 if (!block)
857 return;
858 read_block(block, add_zone_ind_blk);
859 for (i = 0; i < BLOCK_SIZE >> 2; i++)
860 add_zone2(i + (uint32_t *) add_zone_ind_blk, &chg_blk);
861 if (chg_blk)
862 write_block(block, add_zone_ind_blk);
863}
864#endif
865
866static void add_zone_dind(uint16_t *znr, smallint *corrected)
867{
868 int i;
869 int block;
870 smallint chg_blk = 0;
871
872 block = add_zone(znr, corrected);
873 if (!block)
874 return;
875 read_block(block, add_zone_dind_blk);
876 for (i = 0; i < (BLOCK_SIZE >> 1); i++)
877 add_zone_ind(i + (uint16_t *) add_zone_dind_blk, &chg_blk);
878 if (chg_blk)
879 write_block(block, add_zone_dind_blk);
880}
881
882#if ENABLE_FEATURE_MINIX2
883static void add_zone_dind2(uint32_t *znr, smallint *corrected)
884{
885 int i;
886 int block;
887 smallint chg_blk = 0;
888
889 block = add_zone2(znr, corrected);
890 if (!block)
891 return;
892 read_block(block, add_zone_dind_blk);
893 for (i = 0; i < BLOCK_SIZE >> 2; i++)
894 add_zone_ind2(i + (uint32_t *) add_zone_dind_blk, &chg_blk);
895 if (chg_blk)
896 write_block(block, add_zone_dind_blk);
897}
898
899static void add_zone_tind2(uint32_t *znr, smallint *corrected)
900{
901 int i;
902 int block;
903 smallint chg_blk = 0;
904
905 block = add_zone2(znr, corrected);
906 if (!block)
907 return;
908 read_block(block, add_zone_tind_blk);
909 for (i = 0; i < BLOCK_SIZE >> 2; i++)
910 add_zone_dind2(i + (uint32_t *) add_zone_tind_blk, &chg_blk);
911 if (chg_blk)
912 write_block(block, add_zone_tind_blk);
913}
914#endif
915
916static void check_zones(unsigned i)
917{
918 struct minix1_inode *inode;
919
920 if (!i || i > INODES)
921 return;
922 if (inode_count[i] > 1) /* have we counted this file already? */
923 return;
924 inode = Inode1 + i;
925 if (!S_ISDIR(inode->i_mode)
926 && !S_ISREG(inode->i_mode)
927 && !S_ISLNK(inode->i_mode)
928 ) {
929 return;
930 }
931 for (i = 0; i < 7; i++)
932 add_zone(i + inode->i_zone, &changed);
933 add_zone_ind(7 + inode->i_zone, &changed);
934 add_zone_dind(8 + inode->i_zone, &changed);
935}
936
937#if ENABLE_FEATURE_MINIX2
938static void check_zones2(unsigned i)
939{
940 struct minix2_inode *inode;
941
942 if (!i || i > INODES)
943 return;
944 if (inode_count[i] > 1) /* have we counted this file already? */
945 return;
946 inode = Inode2 + i;
947 if (!S_ISDIR(inode->i_mode) && !S_ISREG(inode->i_mode)
948 && !S_ISLNK(inode->i_mode))
949 return;
950 for (i = 0; i < 7; i++)
951 add_zone2(i + inode->i_zone, &changed);
952 add_zone_ind2(7 + inode->i_zone, &changed);
953 add_zone_dind2(8 + inode->i_zone, &changed);
954 add_zone_tind2(9 + inode->i_zone, &changed);
955}
956#endif
957
958static void check_file(struct minix1_inode *dir, unsigned offset)
959{
960 struct minix1_inode *inode;
961 int ino;
962 char *name;
963 int block;
964
965 block = map_block(dir, offset / BLOCK_SIZE);
966 read_block(block, check_file_blk);
967 name = check_file_blk + (offset % BLOCK_SIZE) + 2;
968 ino = *(uint16_t *) (name - 2);
969 if (ino > INODES) {
970 printf("%s contains a bad inode number for file '%.*s'. ",
971 current_name, namelen, name);
972 if (ask("Remove", 1)) {
973 *(uint16_t *) (name - 2) = 0;
974 write_block(block, check_file_blk);
975 }
976 ino = 0;
977 }
978 push_filename(name);
979 inode = get_inode(ino);
980 pop_filename();
981 if (!offset) {
982 if (inode && LONE_CHAR(name, '.'))
983 return;
984 printf("%s: bad directory: '.' isn't first\n", current_name);
985 errors_uncorrected = 1;
986 }
987 if (offset == dirsize) {
988 if (inode && strcmp("..", name) == 0)
989 return;
990 printf("%s: bad directory: '..' isn't second\n", current_name);
991 errors_uncorrected = 1;
992 }
993 if (!inode)
994 return;
995 push_filename(name);
996 if (OPT_list) {
997 if (OPT_verbose)
998 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks);
999 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : "");
1000 }
1001 check_zones(ino);
1002 if (inode && S_ISDIR(inode->i_mode))
1003 recursive_check(ino);
1004 pop_filename();
1005}
1006
1007#if ENABLE_FEATURE_MINIX2
1008static void check_file2(struct minix2_inode *dir, unsigned offset)
1009{
1010 struct minix2_inode *inode;
1011 int ino;
1012 char *name;
1013 int block;
1014
1015 block = map_block2(dir, offset / BLOCK_SIZE);
1016 read_block(block, check_file_blk);
1017 name = check_file_blk + (offset % BLOCK_SIZE) + 2;
1018 ino = *(uint16_t *) (name - 2);
1019 if (ino > INODES) {
1020 printf("%s contains a bad inode number for file '%.*s'. ",
1021 current_name, namelen, name);
1022 if (ask("Remove", 1)) {
1023 *(uint16_t *) (name - 2) = 0;
1024 write_block(block, check_file_blk);
1025 }
1026 ino = 0;
1027 }
1028 push_filename(name);
1029 inode = get_inode2(ino);
1030 pop_filename();
1031 if (!offset) {
1032 if (inode && LONE_CHAR(name, '.'))
1033 return;
1034 printf("%s: bad directory: '.' isn't first\n", current_name);
1035 errors_uncorrected = 1;
1036 }
1037 if (offset == dirsize) {
1038 if (inode && strcmp("..", name) == 0)
1039 return;
1040 printf("%s: bad directory: '..' isn't second\n", current_name);
1041 errors_uncorrected = 1;
1042 }
1043 if (!inode)
1044 return;
1045 push_filename(name);
1046 if (OPT_list) {
1047 if (OPT_verbose)
1048 printf("%6d %07o %3d ", ino, inode->i_mode, inode->i_nlinks);
1049 printf("%s%s\n", current_name, S_ISDIR(inode->i_mode) ? ":" : "");
1050 }
1051 check_zones2(ino);
1052 if (inode && S_ISDIR(inode->i_mode))
1053 recursive_check2(ino);
1054 pop_filename();
1055}
1056#endif
1057
1058static void recursive_check(unsigned ino)
1059{
1060 struct minix1_inode *dir;
1061 unsigned offset;
1062
1063 dir = Inode1 + ino;
1064 if (!S_ISDIR(dir->i_mode))
1065 die("internal error");
1066 if (dir->i_size < 2 * dirsize) {
1067 printf("%s: bad directory: size<32", current_name);
1068 errors_uncorrected = 1;
1069 }
1070 for (offset = 0; offset < dir->i_size; offset += dirsize)
1071 check_file(dir, offset);
1072}
1073
1074#if ENABLE_FEATURE_MINIX2
1075static void recursive_check2(unsigned ino)
1076{
1077 struct minix2_inode *dir;
1078 unsigned offset;
1079
1080 dir = Inode2 + ino;
1081 if (!S_ISDIR(dir->i_mode))
1082 die("internal error");
1083 if (dir->i_size < 2 * dirsize) {
1084 printf("%s: bad directory: size<32", current_name);
1085 errors_uncorrected = 1;
1086 }
1087 for (offset = 0; offset < dir->i_size; offset += dirsize)
1088 check_file2(dir, offset);
1089}
1090#endif
1091
1092static int bad_zone(int i)
1093{
1094 char buffer[BLOCK_SIZE];
1095
1096 xlseek(dev_fd, BLOCK_SIZE * i, SEEK_SET);
1097 return (BLOCK_SIZE != full_read(dev_fd, buffer, BLOCK_SIZE));
1098}
1099
1100static void check_counts(void)
1101{
1102 int i;
1103
1104 for (i = 1; i <= INODES; i++) {
1105 if (OPT_warn_mode && Inode1[i].i_mode && !inode_in_use(i)) {
1106 printf("Inode %d has non-zero mode. ", i);
1107 if (ask("Clear", 1)) {
1108 Inode1[i].i_mode = 0;
1109 changed = 1;
1110 }
1111 }
1112 if (!inode_count[i]) {
1113 if (!inode_in_use(i))
1114 continue;
1115 printf("Unused inode %d is marked as 'used' in the bitmap. ", i);
1116 if (ask("Clear", 1))
1117 unmark_inode(i);
1118 continue;
1119 }
1120 if (!inode_in_use(i)) {
1121 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i);
1122 if (ask("Set", 1))
1123 mark_inode(i);
1124 }
1125 if (Inode1[i].i_nlinks != inode_count[i]) {
1126 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ",
1127 i, Inode1[i].i_mode, Inode1[i].i_nlinks,
1128 inode_count[i]);
1129 if (ask("Set i_nlinks to count", 1)) {
1130 Inode1[i].i_nlinks = inode_count[i];
1131 changed = 1;
1132 }
1133 }
1134 }
1135 for (i = FIRSTZONE; i < ZONES; i++) {
1136 if ((zone_in_use(i) != 0) == zone_count[i])
1137 continue;
1138 if (!zone_count[i]) {
1139 if (bad_zone(i))
1140 continue;
1141 printf("Zone %d is marked 'in use', but no file uses it. ", i);
1142 if (ask("Unmark", 1))
1143 unmark_zone(i);
1144 continue;
1145 }
1146 printf("Zone %d: %sin use, counted=%d\n",
1147 i, zone_in_use(i) ? "" : "not ", zone_count[i]);
1148 }
1149}
1150
1151#if ENABLE_FEATURE_MINIX2
1152static void check_counts2(void)
1153{
1154 int i;
1155
1156 for (i = 1; i <= INODES; i++) {
1157 if (OPT_warn_mode && Inode2[i].i_mode && !inode_in_use(i)) {
1158 printf("Inode %d has non-zero mode. ", i);
1159 if (ask("Clear", 1)) {
1160 Inode2[i].i_mode = 0;
1161 changed = 1;
1162 }
1163 }
1164 if (!inode_count[i]) {
1165 if (!inode_in_use(i))
1166 continue;
1167 printf("Unused inode %d is marked as 'used' in the bitmap. ", i);
1168 if (ask("Clear", 1))
1169 unmark_inode(i);
1170 continue;
1171 }
1172 if (!inode_in_use(i)) {
1173 printf("Inode %d is used, but marked as 'unused' in the bitmap. ", i);
1174 if (ask("Set", 1))
1175 mark_inode(i);
1176 }
1177 if (Inode2[i].i_nlinks != inode_count[i]) {
1178 printf("Inode %d (mode=%07o), i_nlinks=%d, counted=%d. ",
1179 i, Inode2[i].i_mode, Inode2[i].i_nlinks,
1180 inode_count[i]);
1181 if (ask("Set i_nlinks to count", 1)) {
1182 Inode2[i].i_nlinks = inode_count[i];
1183 changed = 1;
1184 }
1185 }
1186 }
1187 for (i = FIRSTZONE; i < ZONES; i++) {
1188 if ((zone_in_use(i) != 0) == zone_count[i])
1189 continue;
1190 if (!zone_count[i]) {
1191 if (bad_zone(i))
1192 continue;
1193 printf("Zone %d is marked 'in use', but no file uses it. ", i);
1194 if (ask("Unmark", 1))
1195 unmark_zone(i);
1196 continue;
1197 }
1198 printf("Zone %d: %sin use, counted=%d\n",
1199 i, zone_in_use(i) ? "" : "not ", zone_count[i]);
1200 }
1201}
1202#endif
1203
1204static void check(void)
1205{
1206 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count));
1207 memset(zone_count, 0, ZONES * sizeof(*zone_count));
1208 check_zones(MINIX_ROOT_INO);
1209 recursive_check(MINIX_ROOT_INO);
1210 check_counts();
1211}
1212
1213#if ENABLE_FEATURE_MINIX2
1214static void check2(void)
1215{
1216 memset(inode_count, 0, (INODES + 1) * sizeof(*inode_count));
1217 memset(zone_count, 0, ZONES * sizeof(*zone_count));
1218 check_zones2(MINIX_ROOT_INO);
1219 recursive_check2(MINIX_ROOT_INO);
1220 check_counts2();
1221}
1222#else
1223void check2(void);
1224#endif
1225
1226int fsck_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1227int fsck_minix_main(int argc UNUSED_PARAM, char **argv)
1228{
1229 struct termios tmp;
1230 int retcode = 0;
1231
1232 xfunc_error_retval = 8;
1233
1234 INIT_G();
1235
1236 opt_complementary = "=1:ar"; /* one argument; -a assumes -r */
1237 getopt32(argv, OPTION_STR);
1238 argv += optind;
1239 device_name = argv[0];
1240
1241 check_mount(); /* trying to check a mounted filesystem? */
1242 if (OPT_manual) {
1243 if (!isatty(0) || !isatty(1))
1244 die("need terminal for interactive repairs");
1245 }
1246 xmove_fd(xopen(device_name, OPT_repair ? O_RDWR : O_RDONLY), dev_fd);
1247
1248 /*sync(); paranoia? */
1249 read_superblock();
1250
1251 /*
1252 * Determine whether or not we should continue with the checking.
1253 * This is based on the status of the filesystem valid and error
1254 * flags and whether or not the -f switch was specified on the
1255 * command line.
1256 */
1257 printf("%s: %s\n", applet_name, bb_banner);
1258
1259 if (!(Super.s_state & MINIX_ERROR_FS)
1260 && (Super.s_state & MINIX_VALID_FS) && !OPT_force
1261 ) {
1262 if (OPT_repair)
1263 printf("%s is clean, check is skipped\n", device_name);
1264 return 0;
1265 } else if (OPT_force)
1266 printf("Forcing filesystem check on %s\n", device_name);
1267 else if (OPT_repair)
1268 printf("Filesystem on %s is dirty, needs checking\n",
1269 device_name);
1270
1271 read_tables();
1272
1273 if (OPT_manual) {
1274 tcgetattr(0, &sv_termios);
1275 tmp = sv_termios;
1276 tmp.c_lflag &= ~(ICANON | ECHO);
1277 tcsetattr_stdin_TCSANOW(&tmp);
1278 termios_set = 1;
1279 }
1280
1281 if (version2) {
1282 check_root2();
1283 check2();
1284 } else {
1285 check_root();
1286 check();
1287 }
1288
1289 if (OPT_verbose) {
1290 int i, free_cnt;
1291
1292 for (i = 1, free_cnt = 0; i <= INODES; i++)
1293 if (!inode_in_use(i))
1294 free_cnt++;
1295 printf("\n%6u inodes used (%u%%)\n", (INODES - free_cnt),
1296 100 * (INODES - free_cnt) / INODES);
1297 for (i = FIRSTZONE, free_cnt = 0; i < ZONES; i++)
1298 if (!zone_in_use(i))
1299 free_cnt++;
1300 printf("%6u zones used (%u%%)\n\n"
1301 "%6u regular files\n"
1302 "%6u directories\n"
1303 "%6u character device files\n"
1304 "%6u block device files\n"
1305 "%6u links\n"
1306 "%6u symbolic links\n"
1307 "------\n"
1308 "%6u files\n",
1309 (ZONES - free_cnt), 100 * (ZONES - free_cnt) / ZONES,
1310 regular, directory, chardev, blockdev,
1311 links - 2 * directory + 1, symlinks,
1312 total - 2 * directory + 1);
1313 }
1314 if (changed) {
1315 write_tables();
1316 puts("FILE SYSTEM HAS BEEN CHANGED");
1317 sync();
1318 } else if (OPT_repair)
1319 write_superblock();
1320
1321 if (OPT_manual)
1322 tcsetattr_stdin_TCSANOW(&sv_termios);
1323
1324 if (changed)
1325 retcode += 3;
1326 if (errors_uncorrected)
1327 retcode += 4;
1328 return retcode;
1329}
1330
generated by cgit at 2024-05-15 06:14:47 (GMT)