aboutsummaryrefslogtreecommitdiff
path: root/util-linux/mkfs_minix.c
blob: 3f7fb4bef364e2fe6da36739221e2f215636d88c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
/* vi: set sw=4 ts=4: */
/*
 * mkfs.c - make a linux (minix) file-system.
 *
 * (C) 1991 Linus Torvalds. This file may be redistributed as per
 * the Linux copyright.
 */

/*
 * DD.MM.YY
 *
 * 24.11.91  -	Time began. Used the fsck sources to get started.
 *
 * 25.11.91  -	Corrected some bugs. Added support for ".badblocks"
 *		The algorithm for ".badblocks" is a bit weird, but
 *		it should work. Oh, well.
 *
 * 25.01.92  -	Added the -l option for getting the list of bad blocks
 *		out of a named file. (Dave Rivers, rivers@ponds.uucp)
 *
 * 28.02.92  -	Added %-information when using -c.
 *
 * 28.02.93  -	Added support for other namelengths than the original
 *		14 characters so that I can test the new kernel routines..
 *
 * 09.10.93  -	Make exit status conform to that required by fsutil
 *		(Rik Faith, faith@cs.unc.edu)
 *
 * 31.10.93  -	Added inode request feature, for backup floppies: use
 *		32 inodes, for a news partition use more.
 *		(Scott Heavner, sdh@po.cwru.edu)
 *
 * 03.01.94  -	Added support for file system valid flag.
 *		(Dr. Wettstein, greg%wind.uucp@plains.nodak.edu)
 *
 * 30.10.94  -  added support for v2 filesystem
 *	        (Andreas Schwab, schwab@issan.informatik.uni-dortmund.de)
 *
 * 09.11.94  -	Added test to prevent overwrite of mounted fs adapted
 *		from Theodore Ts'o's (tytso@athena.mit.edu) mke2fs
 *		program.  (Daniel Quinlan, quinlan@yggdrasil.com)
 *
 * 03.20.95  -	Clear first 512 bytes of filesystem to make certain that
 *		the filesystem is not misidentified as a MS-DOS FAT filesystem.
 *		(Daniel Quinlan, quinlan@yggdrasil.com)
 *
 * 02.07.96  -  Added small patch from Russell King to make the program a
 *		good deal more portable (janl@math.uio.no)
 *
 * Usage:  mkfs [-c | -l filename ] [-v] [-nXX] [-iXX] device [size-in-blocks]
 *
 *	-c for readability checking (SLOW!)
 *      -l for getting a list of bad blocks from a file.
 *	-n for namelength (currently the kernel only uses 14 or 30)
 *	-i for number of inodes
 *	-v for v2 filesystem
 *
 * The device may be a block device or a image of one, but this isn't
 * enforced (but it's not much fun on a character device :-).
 *
 * Modified for BusyBox by Erik Andersen <andersen@debian.org> --
 *	removed getopt based parser and added a hand rolled one.
 */

#include "libbb.h"
#include <mntent.h>

#include "minix.h"

/* Store the very same times/uids/gids for image consistency */
#if 1
# define CUR_TIME 0
# define GETUID 0
# define GETGID 0
#else
/* Was using this. Is it useful? NB: this will break testsuite */
# define CUR_TIME time(NULL)
# define GETUID getuid()
# define GETGID getgid()
#endif

enum {
	MAX_GOOD_BLOCKS         = 512,
	TEST_BUFFER_BLOCKS      = 16,
};

#if !ENABLE_FEATURE_MINIX2
enum { version2 = 0 };
#endif

enum { dev_fd = 3 };

struct globals {
#if ENABLE_FEATURE_MINIX2
	smallint version2;
#define version2 G.version2
#endif
	char *device_name;
	uint32_t total_blocks;
	int badblocks;
	int namelen;
	int dirsize;
	int magic;
	char *inode_buffer;
	char *inode_map;
	char *zone_map;
	int used_good_blocks;
	unsigned long req_nr_inodes;
	unsigned currently_testing;

	char root_block[BLOCK_SIZE];
	char superblock_buffer[BLOCK_SIZE];
	char boot_block_buffer[512];
	unsigned short good_blocks_table[MAX_GOOD_BLOCKS];
	/* check_blocks(): buffer[] was the biggest static in entire bbox */
	char check_blocks_buffer[BLOCK_SIZE * TEST_BUFFER_BLOCKS];

	unsigned short ind_block1[BLOCK_SIZE >> 1];
	unsigned short dind_block1[BLOCK_SIZE >> 1];
	unsigned long ind_block2[BLOCK_SIZE >> 2];
	unsigned long dind_block2[BLOCK_SIZE >> 2];
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)

static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n)
{
	return (size + n-1) / n;
}

#define INODE_BUF1              (((struct minix1_inode*)G.inode_buffer) - 1)
#define INODE_BUF2              (((struct minix2_inode*)G.inode_buffer) - 1)

#define SB                      (*(struct minix_superblock*)G.superblock_buffer)

#define SB_INODES               (SB.s_ninodes)
#define SB_IMAPS                (SB.s_imap_blocks)
#define SB_ZMAPS                (SB.s_zmap_blocks)
#define SB_FIRSTZONE            (SB.s_firstdatazone)
#define SB_ZONE_SIZE            (SB.s_log_zone_size)
#define SB_MAXSIZE              (SB.s_max_size)
#define SB_MAGIC                (SB.s_magic)

#if !ENABLE_FEATURE_MINIX2
# define SB_ZONES               (SB.s_nzones)
# define INODE_BLOCKS           div_roundup(SB_INODES, MINIX1_INODES_PER_BLOCK)
#else
# define SB_ZONES               (version2 ? SB.s_zones : SB.s_nzones)
# define INODE_BLOCKS           div_roundup(SB_INODES, \
                                (version2 ? MINIX2_INODES_PER_BLOCK : MINIX1_INODES_PER_BLOCK))
#endif

#define INODE_BUFFER_SIZE       (INODE_BLOCKS * BLOCK_SIZE)
#define NORM_FIRSTZONE          (2 + SB_IMAPS + SB_ZMAPS + INODE_BLOCKS)

/* Before you ask "where they come from?": */
/* setbit/clrbit are supplied by sys/param.h */

static int minix_bit(const char* a, unsigned i)
{
	return a[i >> 3] & (1<<(i & 7));
}

static void minix_setbit(char *a, unsigned i)
{
	setbit(a, i);
}
static void minix_clrbit(char *a, unsigned i)
{
	clrbit(a, i);
}

/* Note: do not assume 0/1, it is 0/nonzero */
#define zone_in_use(x)  minix_bit(G.zone_map,(x)-SB_FIRSTZONE+1)
/*#define inode_in_use(x) minix_bit(G.inode_map,(x))*/

#define mark_inode(x)   minix_setbit(G.inode_map,(x))
#define unmark_inode(x) minix_clrbit(G.inode_map,(x))
#define mark_zone(x)    minix_setbit(G.zone_map,(x)-SB_FIRSTZONE+1)
#define unmark_zone(x)  minix_clrbit(G.zone_map,(x)-SB_FIRSTZONE+1)

#ifndef BLKGETSIZE
# define BLKGETSIZE     _IO(0x12,96)    /* return device size */
#endif


static long valid_offset(int fd, int offset)
{
	char ch;

	if (lseek(fd, offset, SEEK_SET) < 0)
		return 0;
	if (read(fd, &ch, 1) < 1)
		return 0;
	return 1;
}

static int count_blocks(int fd)
{
	int high, low;

	low = 0;
	for (high = 1; valid_offset(fd, high); high *= 2)
		low = high;

	while (low < high - 1) {
		const int mid = (low + high) / 2;

		if (valid_offset(fd, mid))
			low = mid;
		else
			high = mid;
	}
	valid_offset(fd, 0);
	return (low + 1);
}

static int get_size(const char *file)
{
	int fd;
	long size;

	fd = xopen(file, O_RDWR);
	if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
		close(fd);
		return (size * 512);
	}

	size = count_blocks(fd);
	close(fd);
	return size;
}

static void write_tables(void)
{
	/* Mark the superblock valid. */
	SB.s_state |= MINIX_VALID_FS;
	SB.s_state &= ~MINIX_ERROR_FS;

	msg_eol = "seek to 0 failed";
	xlseek(dev_fd, 0, SEEK_SET);

	msg_eol = "cannot clear boot sector";
	xwrite(dev_fd, G.boot_block_buffer, 512);

	msg_eol = "seek to BLOCK_SIZE failed";
	xlseek(dev_fd, BLOCK_SIZE, SEEK_SET);

	msg_eol = "cannot write superblock";
	xwrite(dev_fd, G.superblock_buffer, BLOCK_SIZE);

	msg_eol = "cannot write inode map";
	xwrite(dev_fd, G.inode_map, SB_IMAPS * BLOCK_SIZE);

	msg_eol = "cannot write zone map";
	xwrite(dev_fd, G.zone_map, SB_ZMAPS * BLOCK_SIZE);

	msg_eol = "cannot write inodes";
	xwrite(dev_fd, G.inode_buffer, INODE_BUFFER_SIZE);

	msg_eol = "\n";
}

static void write_block(int blk, char *buffer)
{
	xlseek(dev_fd, blk * BLOCK_SIZE, SEEK_SET);
	xwrite(dev_fd, buffer, BLOCK_SIZE);
}

static int get_free_block(void)
{
	int blk;

	if (G.used_good_blocks + 1 >= MAX_GOOD_BLOCKS)
		bb_error_msg_and_die("too many bad blocks");
	if (G.used_good_blocks)
		blk = G.good_blocks_table[G.used_good_blocks - 1] + 1;
	else
		blk = SB_FIRSTZONE;
	while (blk < SB_ZONES && zone_in_use(blk))
		blk++;
	if (blk >= SB_ZONES)
		bb_error_msg_and_die("not enough good blocks");
	G.good_blocks_table[G.used_good_blocks] = blk;
	G.used_good_blocks++;
	return blk;
}

static void mark_good_blocks(void)
{
	int blk;

	for (blk = 0; blk < G.used_good_blocks; blk++)
		mark_zone(G.good_blocks_table[blk]);
}

static int next(int zone)
{
	if (!zone)
		zone = SB_FIRSTZONE - 1;
	while (++zone < SB_ZONES)
		if (zone_in_use(zone))
			return zone;
	return 0;
}

static void make_bad_inode(void)
{
	struct minix1_inode *inode = &INODE_BUF1[MINIX_BAD_INO];
	int i, j, zone;
	int ind = 0, dind = 0;
	/* moved to globals to reduce stack usage
	unsigned short ind_block[BLOCK_SIZE >> 1];
	unsigned short dind_block[BLOCK_SIZE >> 1];
	*/
#define ind_block (G.ind_block1)
#define dind_block (G.dind_block1)

#define NEXT_BAD (zone = next(zone))

	if (!G.badblocks)
		return;
	mark_inode(MINIX_BAD_INO);
	inode->i_nlinks = 1;
	/* BTW, setting this makes all images different */
	/* it's harder to check for bugs then - diff isn't helpful :(... */
	inode->i_time = CUR_TIME;
	inode->i_mode = S_IFREG + 0000;
	inode->i_size = G.badblocks * BLOCK_SIZE;
	zone = next(0);
	for (i = 0; i < 7; i++) {
		inode->i_zone[i] = zone;
		if (!NEXT_BAD)
			goto end_bad;
	}
	inode->i_zone[7] = ind = get_free_block();
	memset(ind_block, 0, BLOCK_SIZE);
	for (i = 0; i < 512; i++) {
		ind_block[i] = zone;
		if (!NEXT_BAD)
			goto end_bad;
	}
	inode->i_zone[8] = dind = get_free_block();
	memset(dind_block, 0, BLOCK_SIZE);
	for (i = 0; i < 512; i++) {
		write_block(ind, (char *) ind_block);
		dind_block[i] = ind = get_free_block();
		memset(ind_block, 0, BLOCK_SIZE);
		for (j = 0; j < 512; j++) {
			ind_block[j] = zone;
			if (!NEXT_BAD)
				goto end_bad;
		}
	}
	bb_error_msg_and_die("too many bad blocks");
 end_bad:
	if (ind)
		write_block(ind, (char *) ind_block);
	if (dind)
		write_block(dind, (char *) dind_block);
#undef ind_block
#undef dind_block
}

#if ENABLE_FEATURE_MINIX2
static void make_bad_inode2(void)
{
	struct minix2_inode *inode = &INODE_BUF2[MINIX_BAD_INO];
	int i, j, zone;
	int ind = 0, dind = 0;
	/* moved to globals to reduce stack usage
	unsigned long ind_block[BLOCK_SIZE >> 2];
	unsigned long dind_block[BLOCK_SIZE >> 2];
	*/
#define ind_block (G.ind_block2)
#define dind_block (G.dind_block2)

	if (!G.badblocks)
		return;
	mark_inode(MINIX_BAD_INO);
	inode->i_nlinks = 1;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CUR_TIME;
	inode->i_mode = S_IFREG + 0000;
	inode->i_size = G.badblocks * BLOCK_SIZE;
	zone = next(0);
	for (i = 0; i < 7; i++) {
		inode->i_zone[i] = zone;
		if (!NEXT_BAD)
			goto end_bad;
	}
	inode->i_zone[7] = ind = get_free_block();
	memset(ind_block, 0, BLOCK_SIZE);
	for (i = 0; i < 256; i++) {
		ind_block[i] = zone;
		if (!NEXT_BAD)
			goto end_bad;
	}
	inode->i_zone[8] = dind = get_free_block();
	memset(dind_block, 0, BLOCK_SIZE);
	for (i = 0; i < 256; i++) {
		write_block(ind, (char *) ind_block);
		dind_block[i] = ind = get_free_block();
		memset(ind_block, 0, BLOCK_SIZE);
		for (j = 0; j < 256; j++) {
			ind_block[j] = zone;
			if (!NEXT_BAD)
				goto end_bad;
		}
	}
	/* Could make triple indirect block here */
	bb_error_msg_and_die("too many bad blocks");
 end_bad:
	if (ind)
		write_block(ind, (char *) ind_block);
	if (dind)
		write_block(dind, (char *) dind_block);
#undef ind_block
#undef dind_block
}
#else
void make_bad_inode2(void);
#endif

static void make_root_inode(void)
{
	struct minix1_inode *inode = &INODE_BUF1[MINIX_ROOT_INO];

	mark_inode(MINIX_ROOT_INO);
	inode->i_zone[0] = get_free_block();
	inode->i_nlinks = 2;
	inode->i_time = CUR_TIME;
	if (G.badblocks)
		inode->i_size = 3 * G.dirsize;
	else {
		G.root_block[2 * G.dirsize] = '\0';
		G.root_block[2 * G.dirsize + 1] = '\0';
		inode->i_size = 2 * G.dirsize;
	}
	inode->i_mode = S_IFDIR + 0755;
	inode->i_uid = GETUID;
	if (inode->i_uid)
		inode->i_gid = GETGID;
	write_block(inode->i_zone[0], G.root_block);
}

#if ENABLE_FEATURE_MINIX2
static void make_root_inode2(void)
{
	struct minix2_inode *inode = &INODE_BUF2[MINIX_ROOT_INO];

	mark_inode(MINIX_ROOT_INO);
	inode->i_zone[0] = get_free_block();
	inode->i_nlinks = 2;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CUR_TIME;
	if (G.badblocks)
		inode->i_size = 3 * G.dirsize;
	else {
		G.root_block[2 * G.dirsize] = '\0';
		G.root_block[2 * G.dirsize + 1] = '\0';
		inode->i_size = 2 * G.dirsize;
	}
	inode->i_mode = S_IFDIR + 0755;
	inode->i_uid = GETUID;
	if (inode->i_uid)
		inode->i_gid = GETGID;
	write_block(inode->i_zone[0], G.root_block);
}
#else
void make_root_inode2(void);
#endif

/*
 * Perform a test of a block; return the number of
 * blocks readable.
 */
static size_t do_check(char *buffer, size_t try, unsigned current_block)
{
	ssize_t got;

	/* Seek to the correct loc. */
	msg_eol = "seek failed during testing of blocks";
	xlseek(dev_fd, current_block * BLOCK_SIZE, SEEK_SET);
	msg_eol = "\n";

	/* Try the read */
	got = read(dev_fd, buffer, try * BLOCK_SIZE);
	if (got < 0)
		got = 0;
	try = ((size_t)got) / BLOCK_SIZE;

	if (got & (BLOCK_SIZE - 1))
		fprintf(stderr, "Short read at block %u\n", (unsigned)(current_block + try));
	return try;
}

static void alarm_intr(int alnum UNUSED_PARAM)
{
	if (G.currently_testing >= SB_ZONES)
		return;
	signal(SIGALRM, alarm_intr);
	alarm(5);
	if (!G.currently_testing)
		return;
	printf("%d ...", G.currently_testing);
	fflush(stdout);
}

static void check_blocks(void)
{
	size_t try, got;

	G.currently_testing = 0;
	signal(SIGALRM, alarm_intr);
	alarm(5);
	while (G.currently_testing < SB_ZONES) {
		msg_eol = "seek failed in check_blocks";
		xlseek(dev_fd, G.currently_testing * BLOCK_SIZE, SEEK_SET);
		msg_eol = "\n";
		try = TEST_BUFFER_BLOCKS;
		if (G.currently_testing + try > SB_ZONES)
			try = SB_ZONES - G.currently_testing;
		got = do_check(G.check_blocks_buffer, try, G.currently_testing);
		G.currently_testing += got;
		if (got == try)
			continue;
		if (G.currently_testing < SB_FIRSTZONE)
			bb_error_msg_and_die("bad blocks before data-area: cannot make fs");
		mark_zone(G.currently_testing);
		G.badblocks++;
		G.currently_testing++;
	}
	alarm(0);
	printf("%d bad block(s)\n", G.badblocks);
}

static void get_list_blocks(char *filename)
{
	FILE *listfile;
	unsigned long blockno;

	listfile = xfopen_for_read(filename);
	while (!feof(listfile)) {
		fscanf(listfile, "%ld\n", &blockno);
		mark_zone(blockno);
		G.badblocks++;
	}
	printf("%d bad block(s)\n", G.badblocks);
}

static void setup_tables(void)
{
	unsigned long inodes;
	unsigned norm_firstzone;
	unsigned sb_zmaps;
	unsigned i;

	/* memset(G.superblock_buffer, 0, BLOCK_SIZE); */
	/* memset(G.boot_block_buffer, 0, 512); */
	SB_MAGIC = G.magic;
	SB_ZONE_SIZE = 0;
	SB_MAXSIZE = version2 ? 0x7fffffff : (7 + 512 + 512 * 512) * 1024;
	if (version2)
		SB.s_zones = G.total_blocks;
	else
		SB.s_nzones = G.total_blocks;

	/* some magic nrs: 1 inode / 3 blocks */
	if (G.req_nr_inodes == 0)
		inodes = G.total_blocks / 3;
	else
		inodes = G.req_nr_inodes;
	/* Round up inode count to fill block size */
	if (version2)
		inodes = (inodes + MINIX2_INODES_PER_BLOCK - 1) &
		                 ~(MINIX2_INODES_PER_BLOCK - 1);
	else
		inodes = (inodes + MINIX1_INODES_PER_BLOCK - 1) &
		                 ~(MINIX1_INODES_PER_BLOCK - 1);
	if (inodes > 65535)
		inodes = 65535;
	SB_INODES = inodes;
	SB_IMAPS = div_roundup(SB_INODES + 1, BITS_PER_BLOCK);

	/* Real bad hack but overwise mkfs.minix can be thrown
	 * in infinite loop...
	 * try:
	 * dd if=/dev/zero of=test.fs count=10 bs=1024
	 * mkfs.minix -i 200 test.fs
	 */
	/* This code is not insane: NORM_FIRSTZONE is not a constant,
	 * it is calculated from SB_INODES, SB_IMAPS and SB_ZMAPS */
	i = 999;
	SB_ZMAPS = 0;
	do {
		norm_firstzone = NORM_FIRSTZONE;
		sb_zmaps = div_roundup(G.total_blocks - norm_firstzone + 1, BITS_PER_BLOCK);
		if (SB_ZMAPS == sb_zmaps) goto got_it;
		SB_ZMAPS = sb_zmaps;
		/* new SB_ZMAPS, need to recalc NORM_FIRSTZONE */
	} while (--i);
	bb_error_msg_and_die("incompatible size/inode count, try different -i N");
 got_it:

	SB_FIRSTZONE = norm_firstzone;
	G.inode_map = xmalloc(SB_IMAPS * BLOCK_SIZE);
	G.zone_map = xmalloc(SB_ZMAPS * BLOCK_SIZE);
	memset(G.inode_map, 0xff, SB_IMAPS * BLOCK_SIZE);
	memset(G.zone_map, 0xff, SB_ZMAPS * BLOCK_SIZE);
	for (i = SB_FIRSTZONE; i < SB_ZONES; i++)
		unmark_zone(i);
	for (i = MINIX_ROOT_INO; i <= SB_INODES; i++)
		unmark_inode(i);
	G.inode_buffer = xzalloc(INODE_BUFFER_SIZE);
	printf("%ld inodes\n", (long)SB_INODES);
	printf("%ld blocks\n", (long)SB_ZONES);
	printf("Firstdatazone=%ld (%ld)\n", (long)SB_FIRSTZONE, (long)norm_firstzone);
	printf("Zonesize=%d\n", BLOCK_SIZE << SB_ZONE_SIZE);
	printf("Maxsize=%ld\n", (long)SB_MAXSIZE);
}

int mkfs_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mkfs_minix_main(int argc UNUSED_PARAM, char **argv)
{
	struct mntent *mp;
	unsigned opt;
	char *tmp;
	struct stat statbuf;
	char *str_i;
	char *listfile = NULL;

	INIT_G();
/* default (changed to 30, per Linus's suggestion, Sun Nov 21 08:05:07 1993) */
	G.namelen = 30;
	G.dirsize = 32;
	G.magic = MINIX1_SUPER_MAGIC2;

	if (INODE_SIZE1 * MINIX1_INODES_PER_BLOCK != BLOCK_SIZE)
		bb_error_msg_and_die("bad inode size");
#if ENABLE_FEATURE_MINIX2
	if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE)
		bb_error_msg_and_die("bad inode size");
#endif

	opt_complementary = "n+"; /* -n N */
	opt = getopt32(argv, "ci:l:n:v", &str_i, &listfile, &G.namelen);
	argv += optind;
	//if (opt & 1) -c
	if (opt & 2) G.req_nr_inodes = xatoul(str_i); // -i
	//if (opt & 4) -l
	if (opt & 8) { // -n
		if (G.namelen == 14) G.magic = MINIX1_SUPER_MAGIC;
		else if (G.namelen == 30) G.magic = MINIX1_SUPER_MAGIC2;
		else bb_show_usage();
		G.dirsize = G.namelen + 2;
	}
	if (opt & 0x10) { // -v
#if ENABLE_FEATURE_MINIX2
		version2 = 1;
#else
		bb_error_msg_and_die("not compiled with minix v2 support");
#endif
	}

	G.device_name = *argv++;
	if (!G.device_name)
		bb_show_usage();
	if (*argv)
		G.total_blocks = xatou32(*argv);
	else
		G.total_blocks = get_size(G.device_name) / 1024;

	if (G.total_blocks < 10)
		bb_error_msg_and_die("must have at least 10 blocks");

	if (version2) {
		G.magic = MINIX2_SUPER_MAGIC2;
		if (G.namelen == 14)
			G.magic = MINIX2_SUPER_MAGIC;
	} else if (G.total_blocks > 65535)
		G.total_blocks = 65535;

	/* Check if it is mounted */
	mp = find_mount_point(G.device_name, NULL);
	if (mp && strcmp(G.device_name, mp->mnt_fsname) == 0)
		bb_error_msg_and_die("%s is mounted on %s; "
				"refusing to make a filesystem",
				G.device_name, mp->mnt_dir);

	xmove_fd(xopen(G.device_name, O_RDWR), dev_fd);
	if (fstat(dev_fd, &statbuf) < 0)
		bb_error_msg_and_die("cannot stat %s", G.device_name);
	if (!S_ISBLK(statbuf.st_mode))
		opt &= ~1; // clear -c (check)

/* I don't know why someone has special code to prevent mkfs.minix
 * on IDE devices. Why IDE but not SCSI, etc?... */
#if 0
	else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340)
		/* what is this? */
		bb_error_msg_and_die("will not try "
			"to make filesystem on '%s'", G.device_name);
#endif

	tmp = G.root_block;
	*(short *) tmp = 1;
	strcpy(tmp + 2, ".");
	tmp += G.dirsize;
	*(short *) tmp = 1;
	strcpy(tmp + 2, "..");
	tmp += G.dirsize;
	*(short *) tmp = 2;
	strcpy(tmp + 2, ".badblocks");

	setup_tables();

	if (opt & 1) // -c ?
		check_blocks();
	else if (listfile)
		get_list_blocks(listfile);

	if (version2) {
		make_root_inode2();
		make_bad_inode2();
	} else {
		make_root_inode();
		make_bad_inode();
	}

	mark_good_blocks();
	write_tables();
	return 0;
}