release/src/router/busybox/util-linux/mkfs_minix.c

   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
  66 #include "libbb.h"
  67 #include <mntent.h>
  68
  69 #include "minix.h"
  70
  71 /* Store the very same times/uids/gids for image consistency */
  72 #if 1
  73 # define CUR_TIME 0
  74 # define GETUID 0
  75 # define GETGID 0
  76 #else
  77 /* Was using this. Is it useful? NB: this will break testsuite */
  78 # define CUR_TIME time(NULL)
  79 # define GETUID getuid()
  80 # define GETGID getgid()
  81 #endif
  82
  83 enum {
  84         MAX_GOOD_BLOCKS         = 512,
  85         TEST_BUFFER_BLOCKS      = 16,
  86 };
  87
  88 #if !ENABLE_FEATURE_MINIX2
  89 enum { version2 = 0 };
  90 #endif
  91
  92 enum { dev_fd = 3 };
  93
  94 struct globals {
  95 #if ENABLE_FEATURE_MINIX2
  96         smallint version2;
  97 #define version2 G.version2
  98 #endif
  99         char *device_name;
 100         uint32_t total_blocks;
 101         int badblocks;
 102         int namelen;
 103         int dirsize;
 104         int magic;
 105         char *inode_buffer;
 106         char *inode_map;
 107         char *zone_map;
 108         int used_good_blocks;
 109         unsigned long req_nr_inodes;
 110         unsigned currently_testing;
 111
 112         char root_block[BLOCK_SIZE];
 113         char superblock_buffer[BLOCK_SIZE];
 114         char boot_block_buffer[512];
 115         unsigned short good_blocks_table[MAX_GOOD_BLOCKS];
 116         /* check_blocks(): buffer[] was the biggest static in entire bbox */
 117         char check_blocks_buffer[BLOCK_SIZE * TEST_BUFFER_BLOCKS];
 118
 119         unsigned short ind_block1[BLOCK_SIZE >> 1];
 120         unsigned short dind_block1[BLOCK_SIZE >> 1];
 121         unsigned long ind_block2[BLOCK_SIZE >> 2];
 122         unsigned long dind_block2[BLOCK_SIZE >> 2];
 123 };
 124 #define G (*ptr_to_globals)
 125 #define INIT_G() do { \
 126         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 127 } while (0)
 128
 129 static ALWAYS_INLINE unsigned div_roundup(unsigned size, unsigned n)
 130 {
 131         return (size + n-1) / n;
 132 }
 133
 134 #define INODE_BUF1              (((struct minix1_inode*)G.inode_buffer) - 1)
 135 #define INODE_BUF2              (((struct minix2_inode*)G.inode_buffer) - 1)
 136
 137 #define SB                      (*(struct minix_superblock*)G.superblock_buffer)
 138
 139 #define SB_INODES               (SB.s_ninodes)
 140 #define SB_IMAPS                (SB.s_imap_blocks)
 141 #define SB_ZMAPS                (SB.s_zmap_blocks)
 142 #define SB_FIRSTZONE            (SB.s_firstdatazone)
 143 #define SB_ZONE_SIZE            (SB.s_log_zone_size)
 144 #define SB_MAXSIZE              (SB.s_max_size)
 145 #define SB_MAGIC                (SB.s_magic)
 146
 147 #if !ENABLE_FEATURE_MINIX2
 148 # define SB_ZONES               (SB.s_nzones)
 149 # define INODE_BLOCKS           div_roundup(SB_INODES, MINIX1_INODES_PER_BLOCK)
 150 #else
 151 # define SB_ZONES               (version2 ? SB.s_zones : SB.s_nzones)
 152 # define INODE_BLOCKS           div_roundup(SB_INODES, \
 153                                 (version2 ? MINIX2_INODES_PER_BLOCK : MINIX1_INODES_PER_BLOCK))
 154 #endif
 155
 156 #define INODE_BUFFER_SIZE       (INODE_BLOCKS * BLOCK_SIZE)
 157 #define NORM_FIRSTZONE          (2 + SB_IMAPS + SB_ZMAPS + INODE_BLOCKS)
 158
 159 /* Before you ask "where they come from?": */
 160 /* setbit/clrbit are supplied by sys/param.h */
 161
 162 static int minix_bit(const char* a, unsigned i)
 163 {
 164         return a[i >> 3] & (1<<(i & 7));
 165 }
 166
 167 static void minix_setbit(char *a, unsigned i)
 168 {
 169         setbit(a, i);
 170 }
 171 static void minix_clrbit(char *a, unsigned i)
 172 {
 173         clrbit(a, i);
 174 }
 175
 176 /* Note: do not assume 0/1, it is 0/nonzero */
 177 #define zone_in_use(x)  minix_bit(G.zone_map,(x)-SB_FIRSTZONE+1)
 178 /*#define inode_in_use(x) minix_bit(G.inode_map,(x))*/
 179
 180 #define mark_inode(x)   minix_setbit(G.inode_map,(x))
 181 #define unmark_inode(x) minix_clrbit(G.inode_map,(x))
 182 #define mark_zone(x)    minix_setbit(G.zone_map,(x)-SB_FIRSTZONE+1)
 183 #define unmark_zone(x)  minix_clrbit(G.zone_map,(x)-SB_FIRSTZONE+1)
 184
 185 #ifndef BLKGETSIZE
 186 # define BLKGETSIZE     _IO(0x12,96)    /* return device size */
 187 #endif
 188
 189
 190 static long valid_offset(int fd, int offset)
 191 {
 192         char ch;
 193
 194         if (lseek(fd, offset, SEEK_SET) < 0)
 195                 return 0;
 196         if (read(fd, &ch, 1) < 1)
 197                 return 0;
 198         return 1;
 199 }
 200
 201 static int count_blocks(int fd)
 202 {
 203         int high, low;
 204
 205         low = 0;
 206         for (high = 1; valid_offset(fd, high); high *= 2)
 207                 low = high;
 208
 209         while (low < high - 1) {
 210                 const int mid = (low + high) / 2;
 211
 212                 if (valid_offset(fd, mid))
 213                         low = mid;
 214                 else
 215                         high = mid;
 216         }
 217         valid_offset(fd, 0);
 218         return (low + 1);
 219 }
 220
 221 static int get_size(const char *file)
 222 {
 223         int fd;
 224         long size;
 225
 226         fd = xopen(file, O_RDWR);
 227         if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
 228                 close(fd);
 229                 return (size * 512);
 230         }
 231
 232         size = count_blocks(fd);
 233         close(fd);
 234         return size;
 235 }
 236
 237 static void write_tables(void)
 238 {
 239         /* Mark the superblock valid. */
 240         SB.s_state |= MINIX_VALID_FS;
 241         SB.s_state &= ~MINIX_ERROR_FS;
 242
 243         msg_eol = "seek to 0 failed";
 244         xlseek(dev_fd, 0, SEEK_SET);
 245
 246         msg_eol = "can't clear boot sector";
 247         xwrite(dev_fd, G.boot_block_buffer, 512);
 248
 249         msg_eol = "seek to BLOCK_SIZE failed";
 250         xlseek(dev_fd, BLOCK_SIZE, SEEK_SET);
 251
 252         msg_eol = "can't write superblock";
 253         xwrite(dev_fd, G.superblock_buffer, BLOCK_SIZE);
 254
 255         msg_eol = "can't write inode map";
 256         xwrite(dev_fd, G.inode_map, SB_IMAPS * BLOCK_SIZE);
 257
 258         msg_eol = "can't write zone map";
 259         xwrite(dev_fd, G.zone_map, SB_ZMAPS * BLOCK_SIZE);
 260
 261         msg_eol = "can't write inodes";
 262         xwrite(dev_fd, G.inode_buffer, INODE_BUFFER_SIZE);
 263
 264         msg_eol = "\n";
 265 }
 266
 267 static void write_block(int blk, char *buffer)
 268 {
 269         xlseek(dev_fd, blk * BLOCK_SIZE, SEEK_SET);
 270         xwrite(dev_fd, buffer, BLOCK_SIZE);
 271 }
 272
 273 static int get_free_block(void)
 274 {
 275         int blk;
 276
 277         if (G.used_good_blocks + 1 >= MAX_GOOD_BLOCKS)
 278                 bb_error_msg_and_die("too many bad blocks");
 279         if (G.used_good_blocks)
 280                 blk = G.good_blocks_table[G.used_good_blocks - 1] + 1;
 281         else
 282                 blk = SB_FIRSTZONE;
 283         while (blk < SB_ZONES && zone_in_use(blk))
 284                 blk++;
 285         if (blk >= SB_ZONES)
 286                 bb_error_msg_and_die("not enough good blocks");
 287         G.good_blocks_table[G.used_good_blocks] = blk;
 288         G.used_good_blocks++;
 289         return blk;
 290 }
 291
 292 static void mark_good_blocks(void)
 293 {
 294         int blk;
 295
 296         for (blk = 0; blk < G.used_good_blocks; blk++)
 297                 mark_zone(G.good_blocks_table[blk]);
 298 }
 299
 300 static int next(int zone)
 301 {
 302         if (!zone)
 303                 zone = SB_FIRSTZONE - 1;
 304         while (++zone < SB_ZONES)
 305                 if (zone_in_use(zone))
 306                         return zone;
 307         return 0;
 308 }
 309
 310 static void make_bad_inode(void)
 311 {
 312         struct minix1_inode *inode = &INODE_BUF1[MINIX_BAD_INO];
 313         int i, j, zone;
 314         int ind = 0, dind = 0;
 315         /* moved to globals to reduce stack usage
 316         unsigned short ind_block[BLOCK_SIZE >> 1];
 317         unsigned short dind_block[BLOCK_SIZE >> 1];
 318         */
 319 #define ind_block (G.ind_block1)
 320 #define dind_block (G.dind_block1)
 321
 322 #define NEXT_BAD (zone = next(zone))
 323
 324         if (!G.badblocks)
 325                 return;
 326         mark_inode(MINIX_BAD_INO);
 327         inode->i_nlinks = 1;
 328         /* BTW, setting this makes all images different */
 329         /* it's harder to check for bugs then - diff isn't helpful :(... */
 330         inode->i_time = CUR_TIME;
 331         inode->i_mode = S_IFREG + 0000;
 332         inode->i_size = G.badblocks * BLOCK_SIZE;
 333         zone = next(0);
 334         for (i = 0; i < 7; i++) {
 335                 inode->i_zone[i] = zone;
 336                 if (!NEXT_BAD)
 337                         goto end_bad;
 338         }
 339         inode->i_zone[7] = ind = get_free_block();
 340         memset(ind_block, 0, BLOCK_SIZE);
 341         for (i = 0; i < 512; i++) {
 342                 ind_block[i] = zone;
 343                 if (!NEXT_BAD)
 344                         goto end_bad;
 345         }
 346         inode->i_zone[8] = dind = get_free_block();
 347         memset(dind_block, 0, BLOCK_SIZE);
 348         for (i = 0; i < 512; i++) {
 349                 write_block(ind, (char *) ind_block);
 350                 dind_block[i] = ind = get_free_block();
 351                 memset(ind_block, 0, BLOCK_SIZE);
 352                 for (j = 0; j < 512; j++) {
 353                         ind_block[j] = zone;
 354                         if (!NEXT_BAD)
 355                                 goto end_bad;
 356                 }
 357         }
 358         bb_error_msg_and_die("too many bad blocks");
 359  end_bad:
 360         if (ind)
 361                 write_block(ind, (char *) ind_block);
 362         if (dind)
 363                 write_block(dind, (char *) dind_block);
 364 #undef ind_block
 365 #undef dind_block
 366 }
 367
 368 #if ENABLE_FEATURE_MINIX2
 369 static void make_bad_inode2(void)
 370 {
 371         struct minix2_inode *inode = &INODE_BUF2[MINIX_BAD_INO];
 372         int i, j, zone;
 373         int ind = 0, dind = 0;
 374         /* moved to globals to reduce stack usage
 375         unsigned long ind_block[BLOCK_SIZE >> 2];
 376         unsigned long dind_block[BLOCK_SIZE >> 2];
 377         */
 378 #define ind_block (G.ind_block2)
 379 #define dind_block (G.dind_block2)
 380
 381         if (!G.badblocks)
 382                 return;
 383         mark_inode(MINIX_BAD_INO);
 384         inode->i_nlinks = 1;
 385         inode->i_atime = inode->i_mtime = inode->i_ctime = CUR_TIME;
 386         inode->i_mode = S_IFREG + 0000;
 387         inode->i_size = G.badblocks * BLOCK_SIZE;
 388         zone = next(0);
 389         for (i = 0; i < 7; i++) {
 390                 inode->i_zone[i] = zone;
 391                 if (!NEXT_BAD)
 392                         goto end_bad;
 393         }
 394         inode->i_zone[7] = ind = get_free_block();
 395         memset(ind_block, 0, BLOCK_SIZE);
 396         for (i = 0; i < 256; i++) {
 397                 ind_block[i] = zone;
 398                 if (!NEXT_BAD)
 399                         goto end_bad;
 400         }
 401         inode->i_zone[8] = dind = get_free_block();
 402         memset(dind_block, 0, BLOCK_SIZE);
 403         for (i = 0; i < 256; i++) {
 404                 write_block(ind, (char *) ind_block);
 405                 dind_block[i] = ind = get_free_block();
 406                 memset(ind_block, 0, BLOCK_SIZE);
 407                 for (j = 0; j < 256; j++) {
 408                         ind_block[j] = zone;
 409                         if (!NEXT_BAD)
 410                                 goto end_bad;
 411                 }
 412         }
 413         /* Could make triple indirect block here */
 414         bb_error_msg_and_die("too many bad blocks");
 415  end_bad:
 416         if (ind)
 417                 write_block(ind, (char *) ind_block);
 418         if (dind)
 419                 write_block(dind, (char *) dind_block);
 420 #undef ind_block
 421 #undef dind_block
 422 }
 423 #else
 424 void make_bad_inode2(void);
 425 #endif
 426
 427 static void make_root_inode(void)
 428 {
 429         struct minix1_inode *inode = &INODE_BUF1[MINIX_ROOT_INO];
 430
 431         mark_inode(MINIX_ROOT_INO);
 432         inode->i_zone[0] = get_free_block();
 433         inode->i_nlinks = 2;
 434         inode->i_time = CUR_TIME;
 435         if (G.badblocks)
 436                 inode->i_size = 3 * G.dirsize;
 437         else {
 438                 G.root_block[2 * G.dirsize] = '\0';
 439                 G.root_block[2 * G.dirsize + 1] = '\0';
 440                 inode->i_size = 2 * G.dirsize;
 441         }
 442         inode->i_mode = S_IFDIR + 0755;
 443         inode->i_uid = GETUID;
 444         if (inode->i_uid)
 445                 inode->i_gid = GETGID;
 446         write_block(inode->i_zone[0], G.root_block);
 447 }
 448
 449 #if ENABLE_FEATURE_MINIX2
 450 static void make_root_inode2(void)
 451 {
 452         struct minix2_inode *inode = &INODE_BUF2[MINIX_ROOT_INO];
 453
 454         mark_inode(MINIX_ROOT_INO);
 455         inode->i_zone[0] = get_free_block();
 456         inode->i_nlinks = 2;
 457         inode->i_atime = inode->i_mtime = inode->i_ctime = CUR_TIME;
 458         if (G.badblocks)
 459                 inode->i_size = 3 * G.dirsize;
 460         else {
 461                 G.root_block[2 * G.dirsize] = '\0';
 462                 G.root_block[2 * G.dirsize + 1] = '\0';
 463                 inode->i_size = 2 * G.dirsize;
 464         }
 465         inode->i_mode = S_IFDIR + 0755;
 466         inode->i_uid = GETUID;
 467         if (inode->i_uid)
 468                 inode->i_gid = GETGID;
 469         write_block(inode->i_zone[0], G.root_block);
 470 }
 471 #else
 472 void make_root_inode2(void);
 473 #endif
 474
 475 /*
 476  * Perform a test of a block; return the number of
 477  * blocks readable.
 478  */
 479 static size_t do_check(char *buffer, size_t try, unsigned current_block)
 480 {
 481         ssize_t got;
 482
 483         /* Seek to the correct loc. */
 484         msg_eol = "seek failed during testing of blocks";
 485         xlseek(dev_fd, current_block * BLOCK_SIZE, SEEK_SET);
 486         msg_eol = "\n";
 487
 488         /* Try the read */
 489         got = read(dev_fd, buffer, try * BLOCK_SIZE);
 490         if (got < 0)
 491                 got = 0;
 492         try = ((size_t)got) / BLOCK_SIZE;
 493
 494         if (got & (BLOCK_SIZE - 1))
 495                 fprintf(stderr, "Short read at block %u\n", (unsigned)(current_block + try));
 496         return try;
 497 }
 498
 499 static void alarm_intr(int alnum UNUSED_PARAM)
 500 {
 501         if (G.currently_testing >= SB_ZONES)
 502                 return;
 503         signal(SIGALRM, alarm_intr);
 504         alarm(5);
 505         if (!G.currently_testing)
 506                 return;
 507         printf("%d ...", G.currently_testing);
 508         fflush_all();
 509 }
 510
 511 static void check_blocks(void)
 512 {
 513         size_t try, got;
 514
 515         G.currently_testing = 0;
 516         signal(SIGALRM, alarm_intr);
 517         alarm(5);
 518         while (G.currently_testing < SB_ZONES) {
 519                 msg_eol = "seek failed in check_blocks";
 520                 xlseek(dev_fd, G.currently_testing * BLOCK_SIZE, SEEK_SET);
 521                 msg_eol = "\n";
 522                 try = TEST_BUFFER_BLOCKS;
 523                 if (G.currently_testing + try > SB_ZONES)
 524                         try = SB_ZONES - G.currently_testing;
 525                 got = do_check(G.check_blocks_buffer, try, G.currently_testing);
 526                 G.currently_testing += got;
 527                 if (got == try)
 528                         continue;
 529                 if (G.currently_testing < SB_FIRSTZONE)
 530                         bb_error_msg_and_die("bad blocks before data-area: cannot make fs");
 531                 mark_zone(G.currently_testing);
 532                 G.badblocks++;
 533                 G.currently_testing++;
 534         }
 535         alarm(0);
 536         printf("%d bad block(s)\n", G.badblocks);
 537 }
 538
 539 static void get_list_blocks(char *filename)
 540 {
 541         FILE *listfile;
 542         unsigned long blockno;
 543
 544         listfile = xfopen_for_read(filename);
 545         while (!feof(listfile)) {
 546                 fscanf(listfile, "%ld\n", &blockno);
 547                 mark_zone(blockno);
 548                 G.badblocks++;
 549         }
 550         printf("%d bad block(s)\n", G.badblocks);
 551 }
 552
 553 static void setup_tables(void)
 554 {
 555         unsigned long inodes;
 556         unsigned norm_firstzone;
 557         unsigned sb_zmaps;
 558         unsigned i;
 559
 560         /* memset(G.superblock_buffer, 0, BLOCK_SIZE); */
 561         /* memset(G.boot_block_buffer, 0, 512); */
 562         SB_MAGIC = G.magic;
 563         SB_ZONE_SIZE = 0;
 564         SB_MAXSIZE = version2 ? 0x7fffffff : (7 + 512 + 512 * 512) * 1024;
 565         if (version2)
 566                 SB.s_zones = G.total_blocks;
 567         else
 568                 SB.s_nzones = G.total_blocks;
 569
 570         /* some magic nrs: 1 inode / 3 blocks */
 571         if (G.req_nr_inodes == 0)
 572                 inodes = G.total_blocks / 3;
 573         else
 574                 inodes = G.req_nr_inodes;
 575         /* Round up inode count to fill block size */
 576         if (version2)
 577                 inodes = (inodes + MINIX2_INODES_PER_BLOCK - 1) &
 578                                  ~(MINIX2_INODES_PER_BLOCK - 1);
 579         else
 580                 inodes = (inodes + MINIX1_INODES_PER_BLOCK - 1) &
 581                                  ~(MINIX1_INODES_PER_BLOCK - 1);
 582         if (inodes > 65535)
 583                 inodes = 65535;
 584         SB_INODES = inodes;
 585         SB_IMAPS = div_roundup(SB_INODES + 1, BITS_PER_BLOCK);
 586
 587         /* Real bad hack but overwise mkfs.minix can be thrown
 588          * in infinite loop...
 589          * try:
 590          * dd if=/dev/zero of=test.fs count=10 bs=1024
 591          * mkfs.minix -i 200 test.fs
 592          */
 593         /* This code is not insane: NORM_FIRSTZONE is not a constant,
 594          * it is calculated from SB_INODES, SB_IMAPS and SB_ZMAPS */
 595         i = 999;
 596         SB_ZMAPS = 0;
 597         do {
 598                 norm_firstzone = NORM_FIRSTZONE;
 599                 sb_zmaps = div_roundup(G.total_blocks - norm_firstzone + 1, BITS_PER_BLOCK);
 600                 if (SB_ZMAPS == sb_zmaps) goto got_it;
 601                 SB_ZMAPS = sb_zmaps;
 602                 /* new SB_ZMAPS, need to recalc NORM_FIRSTZONE */
 603         } while (--i);
 604         bb_error_msg_and_die("incompatible size/inode count, try different -i N");
 605  got_it:
 606
 607         SB_FIRSTZONE = norm_firstzone;
 608         G.inode_map = xmalloc(SB_IMAPS * BLOCK_SIZE);
 609         G.zone_map = xmalloc(SB_ZMAPS * BLOCK_SIZE);
 610         memset(G.inode_map, 0xff, SB_IMAPS * BLOCK_SIZE);
 611         memset(G.zone_map, 0xff, SB_ZMAPS * BLOCK_SIZE);
 612         for (i = SB_FIRSTZONE; i < SB_ZONES; i++)
 613                 unmark_zone(i);
 614         for (i = MINIX_ROOT_INO; i <= SB_INODES; i++)
 615                 unmark_inode(i);
 616         G.inode_buffer = xzalloc(INODE_BUFFER_SIZE);
 617         printf("%ld inodes\n", (long)SB_INODES);
 618         printf("%ld blocks\n", (long)SB_ZONES);
 619         printf("Firstdatazone=%ld (%ld)\n", (long)SB_FIRSTZONE, (long)norm_firstzone);
 620         printf("Zonesize=%d\n", BLOCK_SIZE << SB_ZONE_SIZE);
 621         printf("Maxsize=%ld\n", (long)SB_MAXSIZE);
 622 }
 623
 624 int mkfs_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 625 int mkfs_minix_main(int argc UNUSED_PARAM, char **argv)
 626 {
 627         unsigned opt;
 628         char *tmp;
 629         struct stat statbuf;
 630         char *str_i;
 631         char *listfile = NULL;
 632
 633         INIT_G();
 634 /* default (changed to 30, per Linus's suggestion, Sun Nov 21 08:05:07 1993) */
 635         G.namelen = 30;
 636         G.dirsize = 32;
 637         G.magic = MINIX1_SUPER_MAGIC2;
 638
 639         if (INODE_SIZE1 * MINIX1_INODES_PER_BLOCK != BLOCK_SIZE)
 640                 bb_error_msg_and_die("bad inode size");
 641 #if ENABLE_FEATURE_MINIX2
 642         if (INODE_SIZE2 * MINIX2_INODES_PER_BLOCK != BLOCK_SIZE)
 643                 bb_error_msg_and_die("bad inode size");
 644 #endif
 645
 646         opt_complementary = "n+"; /* -n N */
 647         opt = getopt32(argv, "ci:l:n:v", &str_i, &listfile, &G.namelen);
 648         argv += optind;
 649         //if (opt & 1) -c
 650         if (opt & 2) G.req_nr_inodes = xatoul(str_i); // -i
 651         //if (opt & 4) -l
 652         if (opt & 8) { // -n
 653                 if (G.namelen == 14) G.magic = MINIX1_SUPER_MAGIC;
 654                 else if (G.namelen == 30) G.magic = MINIX1_SUPER_MAGIC2;
 655                 else bb_show_usage();
 656                 G.dirsize = G.namelen + 2;
 657         }
 658         if (opt & 0x10) { // -v
 659 #if ENABLE_FEATURE_MINIX2
 660                 version2 = 1;
 661 #else
 662                 bb_error_msg_and_die("not compiled with minix v2 support");
 663 #endif
 664         }
 665
 666         G.device_name = *argv++;
 667         if (!G.device_name)
 668                 bb_show_usage();
 669         if (*argv)
 670                 G.total_blocks = xatou32(*argv);
 671         else
 672                 G.total_blocks = get_size(G.device_name) / 1024;
 673
 674         if (G.total_blocks < 10)
 675                 bb_error_msg_and_die("must have at least 10 blocks");
 676
 677         if (version2) {
 678                 G.magic = MINIX2_SUPER_MAGIC2;
 679                 if (G.namelen == 14)
 680                         G.magic = MINIX2_SUPER_MAGIC;
 681         } else if (G.total_blocks > 65535)
 682                 G.total_blocks = 65535;
 683
 684         /* Check if it is mounted */
 685         if (find_mount_point(G.device_name, 0))
 686                 bb_error_msg_and_die("can't format mounted filesystem");
 687
 688         xmove_fd(xopen(G.device_name, O_RDWR), dev_fd);
 689         xfstat(dev_fd, &statbuf, G.device_name);
 690         if (!S_ISBLK(statbuf.st_mode))
 691                 opt &= ~1; // clear -c (check)
 692
 693 /* I don't know why someone has special code to prevent mkfs.minix
 694  * on IDE devices. Why IDE but not SCSI, etc?... */
 695 #if 0
 696         else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340)
 697                 /* what is this? */
 698                 bb_error_msg_and_die("will not try "
 699                         "to make filesystem on '%s'", G.device_name);
 700 #endif
 701
 702         tmp = G.root_block;
 703         *(short *) tmp = 1;
 704         strcpy(tmp + 2, ".");
 705         tmp += G.dirsize;
 706         *(short *) tmp = 1;
 707         strcpy(tmp + 2, "..");
 708         tmp += G.dirsize;
 709         *(short *) tmp = 2;
 710         strcpy(tmp + 2, ".badblocks");
 711
 712         setup_tables();
 713
 714         if (opt & 1) // -c ?
 715                 check_blocks();
 716         else if (listfile)
 717                 get_list_blocks(listfile);
 718
 719         if (version2) {
 720                 make_root_inode2();
 721                 make_bad_inode2();
 722         } else {
 723                 make_root_inode();
 724                 make_bad_inode();
 725         }
 726
 727         mark_good_blocks();
 728         write_tables();
 729         return 0;
 730 }