blob: 912246b93854b9c2acbed46b528cce1bfcddd839
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * mkfs.c - make a linux (minix) file-system. |
4 | * |
5 | * (C) 1991 Linus Torvalds. |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this source tree. |
8 | */ |
9 | |
10 | /* |
11 | * DD.MM.YY |
12 | * |
13 | * 24.11.91 - Time began. Used the fsck sources to get started. |
14 | * |
15 | * 25.11.91 - Corrected some bugs. Added support for ".badblocks" |
16 | * The algorithm for ".badblocks" is a bit weird, but |
17 | * it should work. Oh, well. |
18 | * |
19 | * 25.01.92 - Added the -l option for getting the list of bad blocks |
20 | * out of a named file. (Dave Rivers, rivers@ponds.uucp) |
21 | * |
22 | * 28.02.92 - Added %-information when using -c. |
23 | * |
24 | * 28.02.93 - Added support for other namelengths than the original |
25 | * 14 characters so that I can test the new kernel routines.. |
26 | * |
27 | * 09.10.93 - Make exit status conform to that required by fsutil |
28 | * (Rik Faith, faith@cs.unc.edu) |
29 | * |
30 | * 31.10.93 - Added inode request feature, for backup floppies: use |
31 | * 32 inodes, for a news partition use more. |
32 | * (Scott Heavner, sdh@po.cwru.edu) |
33 | * |
34 | * 03.01.94 - Added support for file system valid flag. |
35 | * (Dr. Wettstein, greg%wind.uucp@plains.nodak.edu) |
36 | * |
37 | * 30.10.94 - added support for v2 filesystem |
38 | * (Andreas Schwab, schwab@issan.informatik.uni-dortmund.de) |
39 | * |
40 | * 09.11.94 - Added test to prevent overwrite of mounted fs adapted |
41 | * from Theodore Ts'o's (tytso@athena.mit.edu) mke2fs |
42 | * program. (Daniel Quinlan, quinlan@yggdrasil.com) |
43 | * |
44 | * 03.20.95 - Clear first 512 bytes of filesystem to make certain that |
45 | * the filesystem is not misidentified as a MS-DOS FAT filesystem. |
46 | * (Daniel Quinlan, quinlan@yggdrasil.com) |
47 | * |
48 | * 02.07.96 - Added small patch from Russell King to make the program a |
49 | * good deal more portable (janl@math.uio.no) |
50 | * |
51 | * Usage: mkfs [-c | -l filename ] [-v] [-nXX] [-iXX] device [size-in-blocks] |
52 | * |
53 | * -c for readability checking (SLOW!) |
54 | * -l for getting a list of bad blocks from a file. |
55 | * -n for namelength (currently the kernel only uses 14 or 30) |
56 | * -i for number of inodes |
57 | * -v for v2 filesystem |
58 | * |
59 | * The device may be a block device or a image of one, but this isn't |
60 | * enforced (but it's not much fun on a character device :-). |
61 | * |
62 | * Modified for BusyBox by Erik Andersen <andersen@debian.org> -- |
63 | * removed getopt based parser and added a hand rolled one. |
64 | */ |
65 | //config:config MKFS_MINIX |
66 | //config: bool "mkfs_minix" |
67 | //config: default y |
68 | //config: select PLATFORM_LINUX |
69 | //config: help |
70 | //config: The minix filesystem is a nice, small, compact, read-write filesystem |
71 | //config: with little overhead. If you wish to be able to create minix |
72 | //config: filesystems this utility will do the job for you. |
73 | //config: |
74 | //config:config FEATURE_MINIX2 |
75 | //config: bool "Support Minix fs v2 (fsck_minix/mkfs_minix)" |
76 | //config: default y |
77 | //config: depends on FSCK_MINIX || MKFS_MINIX |
78 | //config: help |
79 | //config: If you wish to be able to create version 2 minix filesystems, enable |
80 | //config: this. If you enabled 'mkfs_minix' then you almost certainly want to |
81 | //config: be using the version 2 filesystem support. |
82 | |
83 | //applet:IF_MKFS_MINIX(APPLET_ODDNAME(mkfs.minix, mkfs_minix, BB_DIR_SBIN, BB_SUID_DROP, mkfs_minix)) |
84 | |
85 | //kbuild:lib-$(CONFIG_MKFS_MINIX) += mkfs_minix.o |
86 | |
87 | //usage:#define mkfs_minix_trivial_usage |
88 | //usage: "[-c | -l FILE] [-nXX] [-iXX] BLOCKDEV [KBYTES]" |
89 | //usage:#define mkfs_minix_full_usage "\n\n" |
90 | //usage: "Make a MINIX filesystem\n" |
91 | //usage: "\n -c Check device for bad blocks" |
92 | //usage: "\n -n [14|30] Maximum length of filenames" |
93 | //usage: "\n -i INODES Number of inodes for the filesystem" |
94 | //usage: "\n -l FILE Read bad blocks list from FILE" |
95 | //usage: "\n -v Make version 2 filesystem" |
96 | |
97 | #include "libbb.h" |
98 | #include <mntent.h> |
99 | |
100 | #include "minix.h" |
101 | |
102 | /* Store the very same times/uids/gids for image consistency */ |
103 | #if 1 |
104 | # define CUR_TIME 0 |
105 | # define GETUID 0 |
106 | # define GETGID 0 |
107 | #else |
108 | /* Was using this. Is it useful? NB: this will break testsuite */ |
109 | # define CUR_TIME time(NULL) |
110 | # define GETUID getuid() |
111 | # define GETGID getgid() |
112 | #endif |
113 | |
114 | enum { |
115 | MAX_GOOD_BLOCKS = 512, |
116 | TEST_BUFFER_BLOCKS = 16, |
117 | }; |
118 | |
119 | #if !ENABLE_FEATURE_MINIX2 |
120 | enum { version2 = 0 }; |
121 | #endif |
122 | |
123 | enum { dev_fd = 3 }; |
124 | |
125 | struct globals { |
126 | #if ENABLE_FEATURE_MINIX2 |
127 | smallint version2; |
128 | #define version2 G.version2 |
129 | #endif |
130 | char *device_name; |
131 | uint32_t total_blocks; |
132 | int badblocks; |
133 | int namelen; |
134 | int dirsize; |
135 | int magic; |
136 | char *inode_buffer; |
137 | char *inode_map; |
138 | char *zone_map; |
139 | int used_good_blocks; |
140 | unsigned long req_nr_inodes; |
141 | unsigned currently_testing; |
142 | |
143 | char root_block[BLOCK_SIZE]; |
144 | char superblock_buffer[BLOCK_SIZE]; |
145 | char boot_block_buffer[512]; |
146 | unsigned short good_blocks_table[MAX_GOOD_BLOCKS]; |
147 | /* check_blocks(): buffer[] was the biggest static in entire bbox */ |
148 | char check_blocks_buffer[BLOCK_SIZE * TEST_BUFFER_BLOCKS]; |
149 | |
150 | unsigned short ind_block1[BLOCK_SIZE >> 1]; |
151 | unsigned short dind_block1[BLOCK_SIZE >> 1]; |
152 | unsigned long ind_block2[BLOCK_SIZE >> 2]; |
153 | unsigned long dind_block2[BLOCK_SIZE >> 2]; |
154 | }; |
155 | #define G (*ptr_to_globals) |
156 | #define INIT_G() do { \ |
157 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
158 | } while (0) |
159 | |
160 | static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n) |
161 | { |
162 | return (size + n-1) / n; |
163 | } |
164 | |
165 | #define INODE_BUF1 (((struct minix1_inode*)G.inode_buffer) - 1) |
166 | #define INODE_BUF2 (((struct minix2_inode*)G.inode_buffer) - 1) |
167 | |
168 | #define SB (*(struct minix_superblock*)G.superblock_buffer) |
169 | |
170 | #define SB_INODES (SB.s_ninodes) |
171 | #define SB_IMAPS (SB.s_imap_blocks) |
172 | #define SB_ZMAPS (SB.s_zmap_blocks) |
173 | #define SB_FIRSTZONE (SB.s_firstdatazone) |
174 | #define SB_ZONE_SIZE (SB.s_log_zone_size) |
175 | #define SB_MAXSIZE (SB.s_max_size) |
176 | #define SB_MAGIC (SB.s_magic) |
177 | |
178 | #if !ENABLE_FEATURE_MINIX2 |
179 | # define SB_ZONES (SB.s_nzones) |
180 | # define INODE_BLOCKS div_roundup(SB_INODES, MINIX1_INODES_PER_BLOCK) |
181 | #else |
182 | # define SB_ZONES (version2 ? SB.s_zones : SB.s_nzones) |
183 | # define INODE_BLOCKS div_roundup(SB_INODES, \ |
184 | (version2 ? MINIX2_INODES_PER_BLOCK : MINIX1_INODES_PER_BLOCK)) |
185 | #endif |
186 | |
187 | #define INODE_BUFFER_SIZE (INODE_BLOCKS * BLOCK_SIZE) |
188 | #define NORM_FIRSTZONE (2 + SB_IMAPS + SB_ZMAPS + INODE_BLOCKS) |
189 | |
190 | /* Before you ask "where they come from?": */ |
191 | /* setbit/clrbit are supplied by sys/param.h */ |
192 | |
193 | static int minix_bit(const char* a, unsigned i) |
194 | { |
195 | return a[i >> 3] & (1<<(i & 7)); |
196 | } |
197 | |
198 | static void minix_setbit(char *a, unsigned i) |
199 | { |
200 | setbit(a, i); |
201 | } |
202 | static void minix_clrbit(char *a, unsigned i) |
203 | { |
204 | clrbit(a, i); |
205 | } |
206 | |
207 | /* Note: do not assume 0/1, it is 0/nonzero */ |
208 | #define zone_in_use(x) minix_bit(G.zone_map,(x)-SB_FIRSTZONE+1) |
209 | /*#define inode_in_use(x) minix_bit(G.inode_map,(x))*/ |
210 | |
211 | #define mark_inode(x) minix_setbit(G.inode_map,(x)) |
212 | #define unmark_inode(x) minix_clrbit(G.inode_map,(x)) |
213 | #define mark_zone(x) minix_setbit(G.zone_map,(x)-SB_FIRSTZONE+1) |
214 | #define unmark_zone(x) minix_clrbit(G.zone_map,(x)-SB_FIRSTZONE+1) |
215 | |
216 | #ifndef BLKGETSIZE |
217 | # define BLKGETSIZE _IO(0x12,96) /* return device size */ |
218 | #endif |
219 | |
220 | static void write_tables(void) |
221 | { |
222 | /* Mark the superblock valid. */ |
223 | SB.s_state |= MINIX_VALID_FS; |
224 | SB.s_state &= ~MINIX_ERROR_FS; |
225 | |
226 | msg_eol = "seek to 0 failed"; |
227 | xlseek(dev_fd, 0, SEEK_SET); |
228 | |
229 | msg_eol = "can't clear boot sector"; |
230 | xwrite(dev_fd, G.boot_block_buffer, 512); |
231 | |
232 | msg_eol = "seek to BLOCK_SIZE failed"; |
233 | xlseek(dev_fd, BLOCK_SIZE, SEEK_SET); |
234 | |
235 | msg_eol = "can't write superblock"; |
236 | xwrite(dev_fd, G.superblock_buffer, BLOCK_SIZE); |
237 | |
238 | msg_eol = "can't write inode map"; |
239 | xwrite(dev_fd, G.inode_map, SB_IMAPS * BLOCK_SIZE); |
240 | |
241 | msg_eol = "can't write zone map"; |
242 | xwrite(dev_fd, G.zone_map, SB_ZMAPS * BLOCK_SIZE); |
243 | |
244 | msg_eol = "can't write inodes"; |
245 | xwrite(dev_fd, G.inode_buffer, INODE_BUFFER_SIZE); |
246 | |
247 | msg_eol = "\n"; |
248 | } |
249 | |
250 | static void write_block(int blk, char *buffer) |
251 | { |
252 | xlseek(dev_fd, blk * BLOCK_SIZE, SEEK_SET); |
253 | xwrite(dev_fd, buffer, BLOCK_SIZE); |
254 | } |
255 | |
256 | static int get_free_block(void) |
257 | { |
258 | int blk; |
259 | |
260 | if (G.used_good_blocks + 1 >= MAX_GOOD_BLOCKS) |
261 | bb_error_msg_and_die("too many bad blocks"); |
262 | if (G.used_good_blocks) |
263 | blk = G.good_blocks_table[G.used_good_blocks - 1] + 1; |
264 | else |
265 | blk = SB_FIRSTZONE; |
266 | while (blk < SB_ZONES && zone_in_use(blk)) |
267 | blk++; |
268 | if (blk >= SB_ZONES) |
269 | bb_error_msg_and_die("not enough good blocks"); |
270 | G.good_blocks_table[G.used_good_blocks] = blk; |
271 | G.used_good_blocks++; |
272 | return blk; |
273 | } |
274 | |
275 | static void mark_good_blocks(void) |
276 | { |
277 | int blk; |
278 | |
279 | for (blk = 0; blk < G.used_good_blocks; blk++) |
280 | mark_zone(G.good_blocks_table[blk]); |
281 | } |
282 | |
283 | static int next(int zone) |
284 | { |
285 | if (!zone) |
286 | zone = SB_FIRSTZONE - 1; |
287 | while (++zone < SB_ZONES) |
288 | if (zone_in_use(zone)) |
289 | return zone; |
290 | return 0; |
291 | } |
292 | |
293 | static void make_bad_inode(void) |
294 | { |
295 | struct minix1_inode *inode = &INODE_BUF1[MINIX_BAD_INO]; |
296 | int i, j, zone; |
297 | int ind = 0, dind = 0; |
298 | /* moved to globals to reduce stack usage |
299 | unsigned short ind_block[BLOCK_SIZE >> 1]; |
300 | unsigned short dind_block[BLOCK_SIZE >> 1]; |
301 | */ |
302 | #define ind_block (G.ind_block1) |
303 | #define dind_block (G.dind_block1) |
304 | |
305 | #define NEXT_BAD (zone = next(zone)) |
306 | |
307 | if (!G.badblocks) |
308 | return; |
309 | mark_inode(MINIX_BAD_INO); |
310 | inode->i_nlinks = 1; |
311 | /* BTW, setting this makes all images different */ |
312 | /* it's harder to check for bugs then - diff isn't helpful :(... */ |
313 | inode->i_time = CUR_TIME; |
314 | inode->i_mode = S_IFREG + 0000; |
315 | inode->i_size = G.badblocks * BLOCK_SIZE; |
316 | zone = next(0); |
317 | for (i = 0; i < 7; i++) { |
318 | inode->i_zone[i] = zone; |
319 | if (!NEXT_BAD) |
320 | goto end_bad; |
321 | } |
322 | inode->i_zone[7] = ind = get_free_block(); |
323 | memset(ind_block, 0, BLOCK_SIZE); |
324 | for (i = 0; i < 512; i++) { |
325 | ind_block[i] = zone; |
326 | if (!NEXT_BAD) |
327 | goto end_bad; |
328 | } |
329 | inode->i_zone[8] = dind = get_free_block(); |
330 | memset(dind_block, 0, BLOCK_SIZE); |
331 | for (i = 0; i < 512; i++) { |
332 | write_block(ind, (char *) ind_block); |
333 | dind_block[i] = ind = get_free_block(); |
334 | memset(ind_block, 0, BLOCK_SIZE); |
335 | for (j = 0; j < 512; j++) { |
336 | ind_block[j] = zone; |
337 | if (!NEXT_BAD) |
338 | goto end_bad; |
339 | } |
340 | } |
341 | bb_error_msg_and_die("too many bad blocks"); |
342 | end_bad: |
343 | if (ind) |
344 | write_block(ind, (char *) ind_block); |
345 | if (dind) |
346 | write_block(dind, (char *) dind_block); |
347 | #undef ind_block |
348 | #undef dind_block |
349 | } |
350 | |
351 | #if ENABLE_FEATURE_MINIX2 |
352 | static void make_bad_inode2(void) |
353 | { |
354 | struct minix2_inode *inode = &INODE_BUF2[MINIX_BAD_INO]; |
355 | int i, j, zone; |
356 | int ind = 0, dind = 0; |
357 | /* moved to globals to reduce stack usage |
358 | unsigned long ind_block[BLOCK_SIZE >> 2]; |
359 | unsigned long dind_block[BLOCK_SIZE >> 2]; |
360 | */ |
361 | #define ind_block (G.ind_block2) |
362 | #define dind_block (G.dind_block2) |
363 | |
364 | if (!G.badblocks) |
365 | return; |
366 | mark_inode(MINIX_BAD_INO); |
367 | inode->i_nlinks = 1; |
368 | inode->i_atime = inode->i_mtime = inode->i_ctime = CUR_TIME; |
369 | inode->i_mode = S_IFREG + 0000; |
370 | inode->i_size = G.badblocks * BLOCK_SIZE; |
371 | zone = next(0); |
372 | for (i = 0; i < 7; i++) { |
373 | inode->i_zone[i] = zone; |
374 | if (!NEXT_BAD) |
375 | goto end_bad; |
376 | } |
377 | inode->i_zone[7] = ind = get_free_block(); |
378 | memset(ind_block, 0, BLOCK_SIZE); |
379 | for (i = 0; i < 256; i++) { |
380 | ind_block[i] = zone; |
381 | if (!NEXT_BAD) |
382 | goto end_bad; |
383 | } |
384 | inode->i_zone[8] = dind = get_free_block(); |
385 | memset(dind_block, 0, BLOCK_SIZE); |
386 | for (i = 0; i < 256; i++) { |
387 | write_block(ind, (char *) ind_block); |
388 | dind_block[i] = ind = get_free_block(); |
389 | memset(ind_block, 0, BLOCK_SIZE); |
390 | for (j = 0; j < 256; j++) { |
391 | ind_block[j] = zone; |
392 | if (!NEXT_BAD) |
393 | goto end_bad; |
394 | } |
395 | } |
396 | /* Could make triple indirect block here */ |
397 | bb_error_msg_and_die("too many bad blocks"); |
398 | end_bad: |
399 | if (ind) |
400 | write_block(ind, (char *) ind_block); |
401 | if (dind) |
402 | write_block(dind, (char *) dind_block); |
403 | #undef ind_block |
404 | #undef dind_block |
405 | } |
406 | #else |
407 | void make_bad_inode2(void); |
408 | #endif |
409 | |
410 | static void make_root_inode(void) |
411 | { |
412 | struct minix1_inode *inode = &INODE_BUF1[MINIX_ROOT_INO]; |
413 | |
414 | mark_inode(MINIX_ROOT_INO); |
415 | inode->i_zone[0] = get_free_block(); |
416 | inode->i_nlinks = 2; |
417 | inode->i_time = CUR_TIME; |
418 | if (G.badblocks) |
419 | inode->i_size = 3 * G.dirsize; |
420 | else { |
421 | G.root_block[2 * G.dirsize] = '\0'; |
422 | G.root_block[2 * G.dirsize + 1] = '\0'; |
423 | inode->i_size = 2 * G.dirsize; |
424 | } |
425 | inode->i_mode = S_IFDIR + 0755; |
426 | inode->i_uid = GETUID; |
427 | if (inode->i_uid) |
428 | inode->i_gid = GETGID; |
429 | write_block(inode->i_zone[0], G.root_block); |
430 | } |
431 | |
432 | #if ENABLE_FEATURE_MINIX2 |
433 | static void make_root_inode2(void) |
434 | { |
435 | struct minix2_inode *inode = &INODE_BUF2[MINIX_ROOT_INO]; |
436 | |
437 | mark_inode(MINIX_ROOT_INO); |
438 | inode->i_zone[0] = get_free_block(); |
439 | inode->i_nlinks = 2; |
440 | inode->i_atime = inode->i_mtime = inode->i_ctime = CUR_TIME; |
441 | if (G.badblocks) |
442 | inode->i_size = 3 * G.dirsize; |
443 | else { |
444 | G.root_block[2 * G.dirsize] = '\0'; |
445 | G.root_block[2 * G.dirsize + 1] = '\0'; |
446 | inode->i_size = 2 * G.dirsize; |
447 | } |
448 | inode->i_mode = S_IFDIR + 0755; |
449 | inode->i_uid = GETUID; |
450 | if (inode->i_uid) |
451 | inode->i_gid = GETGID; |
452 | write_block(inode->i_zone[0], G.root_block); |
453 | } |
454 | #else |
455 | void make_root_inode2(void); |
456 | #endif |
457 | |
458 | /* |
459 | * Perform a test of a block; return the number of |
460 | * blocks readable. |
461 | */ |
462 | static size_t do_check(char *buffer, size_t try, unsigned current_block) |
463 | { |
464 | ssize_t got; |
465 | |
466 | /* Seek to the correct loc. */ |
467 | msg_eol = "seek failed during testing of blocks"; |
468 | xlseek(dev_fd, current_block * BLOCK_SIZE, SEEK_SET); |
469 | msg_eol = "\n"; |
470 | |
471 | /* Try the read */ |
472 | got = read(dev_fd, buffer, try * BLOCK_SIZE); |
473 | if (got < 0) |
474 | got = 0; |
475 | try = ((size_t)got) / BLOCK_SIZE; |
476 | |
477 | if (got & (BLOCK_SIZE - 1)) |
478 | fprintf(stderr, "Short read at block %u\n", (unsigned)(current_block + try)); |
479 | return try; |
480 | } |
481 | |
482 | static void alarm_intr(int alnum UNUSED_PARAM) |
483 | { |
484 | if (G.currently_testing >= SB_ZONES) |
485 | return; |
486 | signal(SIGALRM, alarm_intr); |
487 | alarm(5); |
488 | if (!G.currently_testing) |
489 | return; |
490 | printf("%d ...", G.currently_testing); |
491 | fflush_all(); |
492 | } |
493 | |
494 | static void check_blocks(void) |
495 | { |
496 | size_t try, got; |
497 | |
498 | G.currently_testing = 0; |
499 | signal(SIGALRM, alarm_intr); |
500 | alarm(5); |
501 | while (G.currently_testing < SB_ZONES) { |
502 | msg_eol = "seek failed in check_blocks"; |
503 | xlseek(dev_fd, G.currently_testing * BLOCK_SIZE, SEEK_SET); |
504 | msg_eol = "\n"; |
505 | try = TEST_BUFFER_BLOCKS; |
506 | if (G.currently_testing + try > SB_ZONES) |
507 | try = SB_ZONES - G.currently_testing; |
508 | got = do_check(G.check_blocks_buffer, try, G.currently_testing); |
509 | G.currently_testing += got; |
510 | if (got == try) |
511 | continue; |
512 | if (G.currently_testing < SB_FIRSTZONE) |
513 | bb_error_msg_and_die("bad blocks before data-area: cannot make fs"); |
514 | mark_zone(G.currently_testing); |
515 | G.badblocks++; |
516 | G.currently_testing++; |
517 | } |
518 | alarm(0); |
519 | printf("%d bad block(s)\n", G.badblocks); |
520 | } |
521 | |
522 | static void get_list_blocks(char *filename) |
523 | { |
524 | FILE *listfile; |
525 | unsigned long blockno; |
526 | |
527 | listfile = xfopen_for_read(filename); |
528 | while (!feof(listfile)) { |
529 | fscanf(listfile, "%lu\n", &blockno); |
530 | mark_zone(blockno); |
531 | G.badblocks++; |
532 | } |
533 | printf("%d bad block(s)\n", G.badblocks); |
534 | } |
535 | |
536 | static void setup_tables(void) |
537 | { |
538 | unsigned long inodes; |
539 | unsigned norm_firstzone; |
540 | unsigned sb_zmaps; |
541 | unsigned i; |
542 | |
543 | /* memset(G.superblock_buffer, 0, BLOCK_SIZE); */ |
544 | /* memset(G.boot_block_buffer, 0, 512); */ |
545 | SB_MAGIC = G.magic; |
546 | SB_ZONE_SIZE = 0; |
547 | SB_MAXSIZE = version2 ? 0x7fffffff : (7 + 512 + 512 * 512) * 1024; |
548 | if (version2) |
549 | SB.s_zones = G.total_blocks; |
550 | else |
551 | SB.s_nzones = G.total_blocks; |
552 | |
553 | /* some magic nrs: 1 inode / 3 blocks */ |
554 | if (G.req_nr_inodes == 0) |
555 | inodes = G.total_blocks / 3; |
556 | else |
557 | inodes = G.req_nr_inodes; |
558 | /* Round up inode count to fill block size */ |
559 | if (version2) |
560 | inodes = (inodes + MINIX2_INODES_PER_BLOCK - 1) & |
561 | ~(MINIX2_INODES_PER_BLOCK - 1); |
562 | else |
563 | inodes = (inodes + MINIX1_INODES_PER_BLOCK - 1) & |
564 | ~(MINIX1_INODES_PER_BLOCK - 1); |
565 | if (inodes > 65535) |
566 | inodes = 65535; |
567 | SB_INODES = inodes; |
568 | SB_IMAPS = div_roundup(SB_INODES + 1, BITS_PER_BLOCK); |
569 | |
570 | /* Real bad hack but overwise mkfs.minix can be thrown |
571 | * in infinite loop... |
572 | * try: |
573 | * dd if=/dev/zero of=test.fs count=10 bs=1024 |
574 | * mkfs.minix -i 200 test.fs |
575 | */ |
576 | /* This code is not insane: NORM_FIRSTZONE is not a constant, |
577 | * it is calculated from SB_INODES, SB_IMAPS and SB_ZMAPS */ |
578 | i = 999; |
579 | SB_ZMAPS = 0; |
580 | do { |
581 | norm_firstzone = NORM_FIRSTZONE; |
582 | sb_zmaps = div_roundup(G.total_blocks - norm_firstzone + 1, BITS_PER_BLOCK); |
583 | if (SB_ZMAPS == sb_zmaps) goto got_it; |
584 | SB_ZMAPS = sb_zmaps; |
585 | /* new SB_ZMAPS, need to recalc NORM_FIRSTZONE */ |
586 | } while (--i); |
587 | bb_error_msg_and_die("incompatible size/inode count, try different -i N"); |
588 | got_it: |
589 | |
590 | SB_FIRSTZONE = norm_firstzone; |
591 | G.inode_map = xmalloc(SB_IMAPS * BLOCK_SIZE); |
592 | G.zone_map = xmalloc(SB_ZMAPS * BLOCK_SIZE); |
593 | memset(G.inode_map, 0xff, SB_IMAPS * BLOCK_SIZE); |
594 | memset(G.zone_map, 0xff, SB_ZMAPS * BLOCK_SIZE); |
595 | for (i = SB_FIRSTZONE; i < SB_ZONES; i++) |
596 | unmark_zone(i); |
597 | for (i = MINIX_ROOT_INO; i <= SB_INODES; i++) |
598 | unmark_inode(i); |
599 | G.inode_buffer = xzalloc(INODE_BUFFER_SIZE); |
600 | printf("%lu inodes\n", (unsigned long)SB_INODES); |
601 | printf("%lu blocks\n", (unsigned long)SB_ZONES); |
602 | printf("Firstdatazone=%lu (%lu)\n", (unsigned long)SB_FIRSTZONE, (unsigned long)norm_firstzone); |
603 | printf("Zonesize=%u\n", BLOCK_SIZE << SB_ZONE_SIZE); |
604 | printf("Maxsize=%lu\n", (unsigned long)SB_MAXSIZE); |
605 | } |
606 | |
607 | int mkfs_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
608 | int mkfs_minix_main(int argc UNUSED_PARAM, char **argv) |
609 | { |
610 | unsigned opt; |
611 | char *tmp; |
612 | char *str_i; |
613 | char *listfile = NULL; |
614 | |
615 | INIT_G(); |
616 | /* default (changed to 30, per Linus's suggestion, Sun Nov 21 08:05:07 1993) */ |
617 | G.namelen = 30; |
618 | G.dirsize = 32; |
619 | G.magic = MINIX1_SUPER_MAGIC2; |
620 | |
621 | if (INODE_SIZE1 * MINIX1_INODES_PER_BLOCK != BLOCK_SIZE) |
622 | bb_error_msg_and_die("bad inode size"); |
623 | #if ENABLE_FEATURE_MINIX2 |
624 | if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE) |
625 | bb_error_msg_and_die("bad inode size"); |
626 | #endif |
627 | |
628 | opt = getopt32(argv, "ci:l:n:+v", &str_i, &listfile, &G.namelen); |
629 | argv += optind; |
630 | //if (opt & 1) -c |
631 | if (opt & 2) G.req_nr_inodes = xatoul(str_i); // -i |
632 | //if (opt & 4) -l |
633 | if (opt & 8) { // -n |
634 | if (G.namelen == 14) G.magic = MINIX1_SUPER_MAGIC; |
635 | else if (G.namelen == 30) G.magic = MINIX1_SUPER_MAGIC2; |
636 | else bb_show_usage(); |
637 | G.dirsize = G.namelen + 2; |
638 | } |
639 | if (opt & 0x10) { // -v |
640 | #if ENABLE_FEATURE_MINIX2 |
641 | version2 = 1; |
642 | #else |
643 | bb_error_msg_and_die("not compiled with minix v2 support"); |
644 | #endif |
645 | } |
646 | |
647 | G.device_name = argv[0]; |
648 | if (!G.device_name) |
649 | bb_show_usage(); |
650 | |
651 | /* Check if it is mounted */ |
652 | if (find_mount_point(G.device_name, 0)) |
653 | bb_error_msg_and_die("can't format mounted filesystem"); |
654 | |
655 | xmove_fd(xopen(G.device_name, O_RDWR), dev_fd); |
656 | |
657 | G.total_blocks = get_volume_size_in_bytes(dev_fd, argv[1], 1024, /*extend:*/ 1) / 1024; |
658 | |
659 | if (G.total_blocks < 10) |
660 | bb_error_msg_and_die("must have at least 10 blocks"); |
661 | |
662 | if (version2) { |
663 | G.magic = MINIX2_SUPER_MAGIC2; |
664 | if (G.namelen == 14) |
665 | G.magic = MINIX2_SUPER_MAGIC; |
666 | } else if (G.total_blocks > 65535) |
667 | G.total_blocks = 65535; |
668 | #if 0 |
669 | struct stat statbuf; |
670 | xfstat(dev_fd, &statbuf, G.device_name); |
671 | /* why? */ |
672 | if (!S_ISBLK(statbuf.st_mode)) |
673 | opt &= ~1; // clear -c (check) |
674 | #if 0 |
675 | /* I don't know why someone has special code to prevent mkfs.minix |
676 | * on IDE devices. Why IDE but not SCSI, etc?... */ |
677 | else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340) |
678 | /* what is this? */ |
679 | bb_error_msg_and_die("will not try " |
680 | "to make filesystem on '%s'", G.device_name); |
681 | #endif |
682 | #endif |
683 | tmp = G.root_block; |
684 | *(short *) tmp = 1; |
685 | strcpy(tmp + 2, "."); |
686 | tmp += G.dirsize; |
687 | *(short *) tmp = 1; |
688 | strcpy(tmp + 2, ".."); |
689 | tmp += G.dirsize; |
690 | *(short *) tmp = 2; |
691 | strcpy(tmp + 2, ".badblocks"); |
692 | |
693 | setup_tables(); |
694 | |
695 | if (opt & 1) // -c ? |
696 | check_blocks(); |
697 | else if (listfile) |
698 | get_list_blocks(listfile); |
699 | |
700 | if (version2) { |
701 | make_root_inode2(); |
702 | make_bad_inode2(); |
703 | } else { |
704 | make_root_inode(); |
705 | make_bad_inode(); |
706 | } |
707 | |
708 | mark_good_blocks(); |
709 | write_tables(); |
710 | return 0; |
711 | } |
712 |