mkfs_msdos.c revision 1.1
1 /* $NetBSD: mkfs_msdos.c,v 1.1 2013/01/21 20:28:38 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Robert Nordier 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS 18 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 23 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 #ifndef lint 32 #if 0 33 static const char rcsid[] = 34 "$FreeBSD: src/sbin/newfs_msdos/newfs_msdos.c,v 1.15 2000/10/10 01:49:37 wollman Exp $"; 35 #else 36 __RCSID("$NetBSD: mkfs_msdos.c,v 1.1 2013/01/21 20:28:38 christos Exp $"); 37 #endif 38 #endif /* not lint */ 39 40 #include <sys/types.h> 41 #include <sys/param.h> 42 #include <sys/mount.h> 43 #include <sys/stat.h> 44 #include <sys/time.h> 45 #include <sys/disk.h> 46 47 #include <ctype.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <paths.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <time.h> 56 #include <unistd.h> 57 #include <signal.h> 58 59 #include <util.h> 60 #include <disktab.h> 61 62 #include "partutil.h" 63 #include "mkfs_msdos.h" 64 65 #define MAXU16 0xffff /* maximum unsigned 16-bit quantity */ 66 #define BPN 4 /* bits per nibble */ 67 #define NPB 2 /* nibbles per byte */ 68 69 #define DOSMAGIC 0xaa55 /* DOS magic number */ 70 #define MINBPS 512 /* minimum bytes per sector */ 71 #define MAXSPC 128 /* maximum sectors per cluster */ 72 #define MAXNFT 16 /* maximum number of FATs */ 73 #define DEFBLK 4096 /* default block size */ 74 #define DEFBLK16 2048 /* default block size FAT16 */ 75 #define DEFRDE 512 /* default root directory entries */ 76 #define RESFTE 2 /* reserved FAT entries */ 77 #define MINCLS12 1 /* minimum FAT12 clusters */ 78 #define MINCLS16 0xff5 /* minimum FAT16 clusters */ 79 #define MINCLS32 0xfff5 /* minimum FAT32 clusters */ 80 #define MAXCLS12 0xff4 /* maximum FAT12 clusters */ 81 #define MAXCLS16 0xfff4 /* maximum FAT16 clusters */ 82 #define MAXCLS32 0xffffff4 /* maximum FAT32 clusters */ 83 84 #define mincls(fat_type) ((fat_type) == 12 ? MINCLS12 : \ 85 (fat_type) == 16 ? MINCLS16 : \ 86 MINCLS32) 87 88 #define maxcls(fat_type) ((fat_type) == 12 ? MAXCLS12 : \ 89 (fat_type) == 16 ? MAXCLS16 : \ 90 MAXCLS32) 91 92 #define mk1(p, x) \ 93 (p) = (u_int8_t)(x) 94 95 #define mk2(p, x) \ 96 (p)[0] = (u_int8_t)(x), \ 97 (p)[1] = (u_int8_t)((x) >> 010) 98 99 #define mk4(p, x) \ 100 (p)[0] = (u_int8_t)(x), \ 101 (p)[1] = (u_int8_t)((x) >> 010), \ 102 (p)[2] = (u_int8_t)((x) >> 020), \ 103 (p)[3] = (u_int8_t)((x) >> 030) 104 105 struct bs { 106 u_int8_t jmp[3]; /* bootstrap entry point */ 107 u_int8_t oem[8]; /* OEM name and version */ 108 }; 109 110 struct bsbpb { 111 u_int8_t bps[2]; /* bytes per sector */ 112 u_int8_t spc; /* sectors per cluster */ 113 u_int8_t res[2]; /* reserved sectors */ 114 u_int8_t nft; /* number of FATs */ 115 u_int8_t rde[2]; /* root directory entries */ 116 u_int8_t sec[2]; /* total sectors */ 117 u_int8_t mid; /* media descriptor */ 118 u_int8_t spf[2]; /* sectors per FAT */ 119 u_int8_t spt[2]; /* sectors per track */ 120 u_int8_t hds[2]; /* drive heads */ 121 u_int8_t hid[4]; /* hidden sectors */ 122 u_int8_t bsec[4]; /* big total sectors */ 123 }; 124 125 struct bsxbpb { 126 u_int8_t bspf[4]; /* big sectors per FAT */ 127 u_int8_t xflg[2]; /* FAT control flags */ 128 u_int8_t vers[2]; /* file system version */ 129 u_int8_t rdcl[4]; /* root directory start cluster */ 130 u_int8_t infs[2]; /* file system info sector */ 131 u_int8_t bkbs[2]; /* backup boot sector */ 132 u_int8_t rsvd[12]; /* reserved */ 133 }; 134 135 struct bsx { 136 u_int8_t drv; /* drive number */ 137 u_int8_t rsvd; /* reserved */ 138 u_int8_t sig; /* extended boot signature */ 139 u_int8_t volid[4]; /* volume ID number */ 140 u_int8_t label[11]; /* volume label */ 141 u_int8_t type[8]; /* file system type */ 142 }; 143 144 struct de { 145 u_int8_t namext[11]; /* name and extension */ 146 u_int8_t attr; /* attributes */ 147 u_int8_t rsvd[10]; /* reserved */ 148 u_int8_t time[2]; /* creation time */ 149 u_int8_t date[2]; /* creation date */ 150 u_int8_t clus[2]; /* starting cluster */ 151 u_int8_t size[4]; /* size */ 152 }; 153 154 struct bpb { 155 u_int bps; /* bytes per sector */ 156 u_int spc; /* sectors per cluster */ 157 u_int res; /* reserved sectors */ 158 u_int nft; /* number of FATs */ 159 u_int rde; /* root directory entries */ 160 u_int sec; /* total sectors */ 161 u_int mid; /* media descriptor */ 162 u_int spf; /* sectors per FAT */ 163 u_int spt; /* sectors per track */ 164 u_int hds; /* drive heads */ 165 u_int hid; /* hidden sectors */ 166 u_int bsec; /* big total sectors */ 167 u_int bspf; /* big sectors per FAT */ 168 u_int rdcl; /* root directory start cluster */ 169 u_int infs; /* file system info sector */ 170 u_int bkbs; /* backup boot sector */ 171 }; 172 173 #define INIT(a, b, c, d, e, f, g, h, i, j) \ 174 { .bps = a, .spc = b, .res = c, .nft = d, .rde = e, \ 175 .sec = f, .mid = g, .spf = h, .spt = i, .hds = j, } 176 static struct { 177 const char *name; 178 struct bpb bpb; 179 } stdfmt[] = { 180 {"160", INIT(512, 1, 1, 2, 64, 320, 0xfe, 1, 8, 1)}, 181 {"180", INIT(512, 1, 1, 2, 64, 360, 0xfc, 2, 9, 1)}, 182 {"320", INIT(512, 2, 1, 2, 112, 640, 0xff, 1, 8, 2)}, 183 {"360", INIT(512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2)}, 184 {"640", INIT(512, 2, 1, 2, 112, 1280, 0xfb, 2, 8, 2)}, 185 {"720", INIT(512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2)}, 186 {"1200", INIT(512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2)}, 187 {"1232", INIT(1024,1, 1, 2, 192, 1232, 0xfe, 2, 8, 2)}, 188 {"1440", INIT(512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2)}, 189 {"2880", INIT(512, 2, 1, 2, 240, 5760, 0xf0, 9, 36, 2)} 190 }; 191 192 static u_int8_t bootcode[] = { 193 0xfa, /* cli */ 194 0x31, 0xc0, /* xor ax,ax */ 195 0x8e, 0xd0, /* mov ss,ax */ 196 0xbc, 0x00, 0x7c, /* mov sp,7c00h */ 197 0xfb, /* sti */ 198 0x8e, 0xd8, /* mov ds,ax */ 199 0xe8, 0x00, 0x00, /* call $ + 3 */ 200 0x5e, /* pop si */ 201 0x83, 0xc6, 0x19, /* add si,+19h */ 202 0xbb, 0x07, 0x00, /* mov bx,0007h */ 203 0xfc, /* cld */ 204 0xac, /* lodsb */ 205 0x84, 0xc0, /* test al,al */ 206 0x74, 0x06, /* jz $ + 8 */ 207 0xb4, 0x0e, /* mov ah,0eh */ 208 0xcd, 0x10, /* int 10h */ 209 0xeb, 0xf5, /* jmp $ - 9 */ 210 0x30, 0xe4, /* xor ah,ah */ 211 0xcd, 0x16, /* int 16h */ 212 0xcd, 0x19, /* int 19h */ 213 0x0d, 0x0a, 214 'N', 'o', 'n', '-', 's', 'y', 's', 't', 215 'e', 'm', ' ', 'd', 'i', 's', 'k', 216 0x0d, 0x0a, 217 'P', 'r', 'e', 's', 's', ' ', 'a', 'n', 218 'y', ' ', 'k', 'e', 'y', ' ', 't', 'o', 219 ' ', 'r', 'e', 'b', 'o', 'o', 't', 220 0x0d, 0x0a, 221 0 222 }; 223 224 static int got_siginfo = 0; /* received a SIGINFO */ 225 226 static int check_mounted(const char *, mode_t); 227 static int getstdfmt(const char *, struct bpb *); 228 static int getbpbinfo(int, const char *, const char *, int, struct bpb *, int); 229 static void print_bpb(struct bpb *); 230 static int ckgeom(const char *, u_int, const char *); 231 static int oklabel(const char *); 232 static void mklabel(u_int8_t *, const char *); 233 static void setstr(u_int8_t *, const char *, size_t); 234 static void infohandler(int sig); 235 236 int 237 mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op) 238 { 239 char buf[MAXPATHLEN]; 240 struct stat sb; 241 struct timeval tv; 242 struct bpb bpb; 243 struct tm *tm; 244 struct bs *bs; 245 struct bsbpb *bsbpb; 246 struct bsxbpb *bsxbpb; 247 struct bsx *bsx; 248 struct de *de; 249 u_int8_t *img; 250 const char *bname; 251 ssize_t n; 252 time_t now; 253 u_int bss, rds, cls, dir, lsn, x, x1, x2; 254 int ch, fd, fd1; 255 struct msdos_options o = *op; 256 257 if (o.block_size && o.sectors_per_cluster) { 258 warnx("Cannot specify both block size and sectors per cluster"); 259 return -1; 260 } 261 if (strlen(o.OEM_string) > 8) { 262 warnx("%s: bad OEM string", o.OEM_string); 263 return -1; 264 } 265 if (o.create_size) { 266 off_t pos; 267 if (o.no_create) { 268 warnx("create (-C) is incompatible with -N"); 269 return -1; 270 } 271 fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644); 272 if (fd == -1) { 273 warnx("failed to create %s", fname); 274 return -1; 275 } 276 pos = lseek(fd, o.create_size - 1, SEEK_SET); 277 if (write(fd, "\0", 1) != 1) { 278 warn("failed to set file size"); 279 return -1; 280 } 281 pos = lseek(fd, 0, SEEK_SET); 282 } else if ((fd = open(fname, o.no_create ? O_RDONLY : O_RDWR)) == -1 || 283 fstat(fd, &sb)) 284 warn("%s", fname); 285 return -1; 286 if (!o.no_create) 287 if (check_mounted(fname, sb.st_mode) == -1) 288 return -1; 289 if (!S_ISCHR(sb.st_mode) && !o.create_size) { 290 warnx("warning, %s is not a character device", fname); 291 return -1; 292 } 293 if (o.offset && o.offset != lseek(fd, o.offset, SEEK_SET)) { 294 warnx("cannot seek to %jd", (intmax_t)o.offset); 295 return -1; 296 } 297 memset(&bpb, 0, sizeof(bpb)); 298 if (o.floppy) { 299 if (getstdfmt(o.floppy, &bpb) == -1) 300 return -1; 301 bpb.bsec = bpb.sec; 302 bpb.sec = 0; 303 bpb.bspf = bpb.spf; 304 bpb.spf = 0; 305 } 306 if (o.drive_heads) 307 bpb.hds = o.drive_heads; 308 if (o.sectors_per_track) 309 bpb.spt = o.sectors_per_track; 310 if (o.bytes_per_sector) 311 bpb.bps = o.bytes_per_sector; 312 if (o.size) 313 bpb.bsec = o.size; 314 if (o.hidden_sectors_set) 315 bpb.hid = o.hidden_sectors; 316 if (!(o.floppy || (o.drive_heads && o.sectors_per_track && 317 o.bytes_per_sector && o.size && o.hidden_sectors_set))) { 318 if (getbpbinfo(fd, fname, dtype, o.hidden_sectors_set, &bpb, 319 o.create_size != 0) == -1) 320 return -1; 321 bpb.bsec -= (o.offset / bpb.bps); 322 if (bpb.spc == 0) { /* set defaults */ 323 if (bpb.bsec <= 6000) /* about 3MB -> 512 bytes */ 324 bpb.spc = 1; 325 else if (bpb.bsec <= (1<<17)) /* 64M -> 4k */ 326 bpb.spc = 8; 327 else if (bpb.bsec <= (1<<19)) /* 256M -> 8k */ 328 bpb.spc = 16; 329 else if (bpb.bsec <= (1<<21)) /* 1G -> 16k */ 330 bpb.spc = 32; 331 else 332 bpb.spc = 64; /* otherwise 32k */ 333 } 334 } 335 336 if (!oklabel(o.volume_label)) { 337 warnx("%s: bad volume label", o.volume_label); 338 return -1; 339 } 340 341 switch (o.fat_type) { 342 case 0: 343 if (o.floppy) 344 o.fat_type = 12; 345 else if (!o.directory_entries && (o.info_sector || o.backup_sector)) 346 o.fat_type = 32; 347 break; 348 case 12: 349 case 16: 350 if (o.info_sector) { 351 warnx("Cannot specify info sector with FAT%u", o.fat_type); 352 return -1; 353 } 354 if (o.backup_sector) { 355 warnx("Cannot specify backup sector with FAT%u", o.fat_type); 356 return -1; 357 } 358 break; 359 case 32: 360 if (o.directory_entries) { 361 warnx("Cannot specify directory entries with FAT32"); 362 return -1; 363 } 364 break; 365 default: 366 warnx("%d: bad FAT type", o.fat_type); 367 return -1; 368 } 369 if (!powerof2(bpb.bps)) { 370 warnx("bytes/sector (%u) is not a power of 2", bpb.bps); 371 return -1; 372 } 373 if (bpb.bps < MINBPS) { 374 warnx("bytes/sector (%u) is too small; minimum is %u", 375 bpb.bps, MINBPS); 376 return -1; 377 } 378 379 if (o.floppy && o.fat_type == 32) 380 bpb.rde = 0; 381 if (o.block_size) { 382 if (!powerof2(o.block_size)) { 383 warnx("block size (%u) is not a power of 2", o.block_size); 384 return -1; 385 } 386 if (o.block_size < bpb.bps) { 387 warnx("block size (%u) is too small; minimum is %u", 388 o.block_size, bpb.bps); 389 return -1; 390 } 391 if (o.block_size > bpb.bps * MAXSPC) { 392 warnx("block size (%u) is too large; maximum is %u", 393 o.block_size, bpb.bps * MAXSPC); 394 return -1; 395 } 396 bpb.spc = o.block_size / bpb.bps; 397 } 398 if (o.sectors_per_cluster) { 399 if (!powerof2(o.sectors_per_cluster)) { 400 warnx("sectors/cluster (%u) is not a power of 2", 401 o.sectors_per_cluster); 402 return -1; 403 } 404 bpb.spc = o.sectors_per_cluster; 405 } 406 if (o.reserved_sectors) 407 bpb.res = o.reserved_sectors; 408 if (o.num_FAT) { 409 if (o.num_FAT > MAXNFT) { 410 warnx("number of FATs (%u) is too large; maximum is %u", 411 o.num_FAT, MAXNFT); 412 return -1; 413 } 414 bpb.nft = o.num_FAT; 415 } 416 if (o.directory_entries) 417 bpb.rde = o.directory_entries; 418 if (o.media_descriptor_set) { 419 if (o.media_descriptor < 0xf0) { 420 warnx("illegal media descriptor (%#x)", o.media_descriptor); 421 return -1; 422 } 423 bpb.mid = o.media_descriptor; 424 } 425 if (o.sectors_per_fat) 426 bpb.bspf = o.sectors_per_fat; 427 if (o.info_sector) 428 bpb.infs = o.info_sector; 429 if (o.backup_sector) 430 bpb.bkbs = o.backup_sector; 431 bss = 1; 432 bname = NULL; 433 fd1 = -1; 434 if (o.bootstrap) { 435 bname = o.bootstrap; 436 if (!strchr(bname, '/')) { 437 snprintf(buf, sizeof(buf), "/boot/%s", bname); 438 if (!(bname = strdup(buf))) 439 err(1, NULL); 440 } 441 if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb)) { 442 warn("%s", bname); 443 return -1; 444 } 445 if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bps || 446 sb.st_size < bpb.bps || sb.st_size > bpb.bps * MAXU16) { 447 warnx("%s: inappropriate file type or format", bname); 448 return -1; 449 } 450 bss = sb.st_size / bpb.bps; 451 } 452 if (!bpb.nft) 453 bpb.nft = 2; 454 if (!o.fat_type) { 455 if (bpb.bsec < (bpb.res ? bpb.res : bss) + 456 howmany((RESFTE + (bpb.spc ? MINCLS16 : MAXCLS12 + 1)) * 457 ((bpb.spc ? 16 : 12) / BPN), bpb.bps * NPB) * 458 bpb.nft + 459 howmany(bpb.rde ? bpb.rde : DEFRDE, 460 bpb.bps / sizeof(struct de)) + 461 (bpb.spc ? MINCLS16 : MAXCLS12 + 1) * 462 (bpb.spc ? bpb.spc : howmany(DEFBLK, bpb.bps))) 463 o.fat_type = 12; 464 else if (bpb.rde || bpb.bsec < 465 (bpb.res ? bpb.res : bss) + 466 howmany((RESFTE + MAXCLS16) * 2, bpb.bps) * bpb.nft + 467 howmany(DEFRDE, bpb.bps / sizeof(struct de)) + 468 (MAXCLS16 + 1) * 469 (bpb.spc ? bpb.spc : howmany(8192, bpb.bps))) 470 o.fat_type = 16; 471 else 472 o.fat_type = 32; 473 } 474 x = bss; 475 if (o.fat_type == 32) { 476 if (!bpb.infs) { 477 if (x == MAXU16 || x == bpb.bkbs) { 478 warnx("no room for info sector"); 479 return -1; 480 } 481 bpb.infs = x; 482 } 483 if (bpb.infs != MAXU16 && x <= bpb.infs) 484 x = bpb.infs + 1; 485 if (!bpb.bkbs) { 486 if (x == MAXU16) { 487 warnx("no room for backup sector"); 488 return -1; 489 } 490 bpb.bkbs = x; 491 } else if (bpb.bkbs != MAXU16 && bpb.bkbs == bpb.infs) { 492 warnx("backup sector would overwrite info sector"); 493 return -1; 494 } 495 if (bpb.bkbs != MAXU16 && x <= bpb.bkbs) 496 x = bpb.bkbs + 1; 497 } 498 if (!bpb.res) 499 bpb.res = o.fat_type == 32 ? MAX(x, MAX(16384 / bpb.bps, 4)) : x; 500 else if (bpb.res < x) { 501 warnx("too few reserved sectors (need %d have %d)", x, bpb.res); 502 return -1; 503 } 504 if (o.fat_type != 32 && !bpb.rde) 505 bpb.rde = DEFRDE; 506 rds = howmany(bpb.rde, bpb.bps / sizeof(struct de)); 507 if (!bpb.spc) 508 for (bpb.spc = howmany(o.fat_type == 16 ? DEFBLK16 : DEFBLK, bpb.bps); 509 bpb.spc < MAXSPC && 510 bpb.res + 511 howmany((RESFTE + maxcls(o.fat_type)) * (o.fat_type / BPN), 512 bpb.bps * NPB) * bpb.nft + 513 rds + 514 (u_int64_t)(maxcls(o.fat_type) + 1) * bpb.spc <= bpb.bsec; 515 bpb.spc <<= 1); 516 if (o.fat_type != 32 && bpb.bspf > MAXU16) { 517 warnx("too many sectors/FAT for FAT12/16"); 518 return -1; 519 } 520 x1 = bpb.res + rds; 521 x = bpb.bspf ? bpb.bspf : 1; 522 if (x1 + (u_int64_t)x * bpb.nft > bpb.bsec) { 523 warnx("meta data exceeds file system size"); 524 return -1; 525 } 526 x1 += x * bpb.nft; 527 x = (u_int64_t)(bpb.bsec - x1) * bpb.bps * NPB / 528 (bpb.spc * bpb.bps * NPB + o.fat_type / BPN * bpb.nft); 529 x2 = howmany((RESFTE + MIN(x, maxcls(o.fat_type))) * (o.fat_type / BPN), 530 bpb.bps * NPB); 531 if (!bpb.bspf) { 532 bpb.bspf = x2; 533 x1 += (bpb.bspf - 1) * bpb.nft; 534 } 535 cls = (bpb.bsec - x1) / bpb.spc; 536 x = (u_int64_t)bpb.bspf * bpb.bps * NPB / (o.fat_type / BPN) - RESFTE; 537 if (cls > x) 538 cls = x; 539 if (bpb.bspf < x2) { 540 warnx("warning: sectors/FAT limits file system to %u clusters", 541 cls); 542 return -1; 543 } 544 if (cls < mincls(o.fat_type)) { 545 warnx("%u clusters too few clusters for FAT%u, need %u", cls, 546 o.fat_type, mincls(o.fat_type)); 547 return -1; 548 } 549 if (cls > maxcls(o.fat_type)) { 550 cls = maxcls(o.fat_type); 551 bpb.bsec = x1 + (cls + 1) * bpb.spc - 1; 552 warnx("warning: FAT type limits file system to %u sectors", 553 bpb.bsec); 554 return -1; 555 } 556 printf("%s: %u sector%s in %u FAT%u cluster%s " 557 "(%u bytes/cluster)\n", fname, cls * bpb.spc, 558 cls * bpb.spc == 1 ? "" : "s", cls, o.fat_type, 559 cls == 1 ? "" : "s", bpb.bps * bpb.spc); 560 if (!bpb.mid) 561 bpb.mid = !bpb.hid ? 0xf0 : 0xf8; 562 if (o.fat_type == 32) 563 bpb.rdcl = RESFTE; 564 if (bpb.hid + bpb.bsec <= MAXU16) { 565 bpb.sec = bpb.bsec; 566 bpb.bsec = 0; 567 } 568 if (o.fat_type != 32) { 569 bpb.spf = bpb.bspf; 570 bpb.bspf = 0; 571 } 572 ch = 0; 573 if (o.fat_type == 12) 574 ch = 1; /* 001 Primary DOS with 12 bit FAT */ 575 else if (o.fat_type == 16) { 576 if (bpb.bsec == 0) 577 ch = 4; /* 004 Primary DOS with 16 bit FAT <32M */ 578 else 579 ch = 6; /* 006 Primary 'big' DOS, 16-bit FAT (> 32MB) */ 580 /* 581 * XXX: what about: 582 * 014 DOS (16-bit FAT) - LBA 583 * ? 584 */ 585 } else if (o.fat_type == 32) { 586 ch = 11; /* 011 Primary DOS with 32 bit FAT */ 587 /* 588 * XXX: what about: 589 * 012 Primary DOS with 32 bit FAT - LBA 590 * ? 591 */ 592 } 593 if (ch != 0) 594 printf("MBR type: %d\n", ch); 595 print_bpb(&bpb); 596 if (!o.no_create) { 597 gettimeofday(&tv, NULL); 598 now = tv.tv_sec; 599 tm = localtime(&now); 600 if (!(img = malloc(bpb.bps))) 601 err(1, NULL); 602 dir = bpb.res + (bpb.spf ? bpb.spf : bpb.bspf) * bpb.nft; 603 signal(SIGINFO, infohandler); 604 for (lsn = 0; lsn < dir + (o.fat_type == 32 ? bpb.spc : rds); lsn++) { 605 if (got_siginfo) { 606 fprintf(stderr,"%s: writing sector %u of %u (%u%%)\n", 607 fname,lsn,(dir + (o.fat_type == 32 ? bpb.spc : rds)), 608 (lsn*100)/(dir + (o.fat_type == 32 ? bpb.spc : rds))); 609 got_siginfo = 0; 610 } 611 x = lsn; 612 if (o.bootstrap && 613 o.fat_type == 32 && bpb.bkbs != MAXU16 && 614 bss <= bpb.bkbs && x >= bpb.bkbs) { 615 x -= bpb.bkbs; 616 if (!x && lseek(fd1, o.offset, SEEK_SET)) { 617 warn("%s", bname); 618 return -1; 619 } 620 } 621 if (o.bootstrap && x < bss) { 622 if ((n = read(fd1, img, bpb.bps)) == -1) { 623 warn("%s", bname); 624 return -1; 625 } 626 if ((size_t)n != bpb.bps) { 627 warnx("%s: can't read sector %u", bname, x); 628 return -1; 629 } 630 } else 631 memset(img, 0, bpb.bps); 632 if (!lsn || 633 (o.fat_type == 32 && bpb.bkbs != MAXU16 && lsn == bpb.bkbs)) { 634 x1 = sizeof(struct bs); 635 bsbpb = (struct bsbpb *)(img + x1); 636 mk2(bsbpb->bps, bpb.bps); 637 mk1(bsbpb->spc, bpb.spc); 638 mk2(bsbpb->res, bpb.res); 639 mk1(bsbpb->nft, bpb.nft); 640 mk2(bsbpb->rde, bpb.rde); 641 mk2(bsbpb->sec, bpb.sec); 642 mk1(bsbpb->mid, bpb.mid); 643 mk2(bsbpb->spf, bpb.spf); 644 mk2(bsbpb->spt, bpb.spt); 645 mk2(bsbpb->hds, bpb.hds); 646 mk4(bsbpb->hid, bpb.hid); 647 mk4(bsbpb->bsec, bpb.bsec); 648 x1 += sizeof(struct bsbpb); 649 if (o.fat_type == 32) { 650 bsxbpb = (struct bsxbpb *)(img + x1); 651 mk4(bsxbpb->bspf, bpb.bspf); 652 mk2(bsxbpb->xflg, 0); 653 mk2(bsxbpb->vers, 0); 654 mk4(bsxbpb->rdcl, bpb.rdcl); 655 mk2(bsxbpb->infs, bpb.infs); 656 mk2(bsxbpb->bkbs, bpb.bkbs); 657 x1 += sizeof(struct bsxbpb); 658 } 659 bsx = (struct bsx *)(img + x1); 660 mk1(bsx->sig, 0x29); 661 if (o.volume_id_set) 662 x = o.volume_id; 663 else 664 x = (((u_int)(1 + tm->tm_mon) << 8 | 665 (u_int)tm->tm_mday) + 666 ((u_int)tm->tm_sec << 8 | 667 (u_int)(tv.tv_usec / 10))) << 16 | 668 ((u_int)(1900 + tm->tm_year) + 669 ((u_int)tm->tm_hour << 8 | 670 (u_int)tm->tm_min)); 671 mk4(bsx->volid, x); 672 mklabel(bsx->label, o.volume_label ? o.volume_label : "NO NAME"); 673 snprintf(buf, sizeof(buf), "FAT%u", o.fat_type); 674 setstr(bsx->type, buf, sizeof(bsx->type)); 675 if (!o.bootstrap) { 676 x1 += sizeof(struct bsx); 677 bs = (struct bs *)img; 678 mk1(bs->jmp[0], 0xeb); 679 mk1(bs->jmp[1], x1 - 2); 680 mk1(bs->jmp[2], 0x90); 681 setstr(bs->oem, o.OEM_string ? o.OEM_string : "NetBSD", 682 sizeof(bs->oem)); 683 memcpy(img + x1, bootcode, sizeof(bootcode)); 684 mk2(img + MINBPS - 2, DOSMAGIC); 685 } 686 } else if (o.fat_type == 32 && bpb.infs != MAXU16 && 687 (lsn == bpb.infs || 688 (bpb.bkbs != MAXU16 && 689 lsn == bpb.bkbs + bpb.infs))) { 690 mk4(img, 0x41615252); 691 mk4(img + MINBPS - 28, 0x61417272); 692 mk4(img + MINBPS - 24, 0xffffffff); 693 mk4(img + MINBPS - 20, bpb.rdcl); 694 mk2(img + MINBPS - 2, DOSMAGIC); 695 } else if (lsn >= bpb.res && lsn < dir && 696 !((lsn - bpb.res) % 697 (bpb.spf ? bpb.spf : bpb.bspf))) { 698 mk1(img[0], bpb.mid); 699 for (x = 1; x < o.fat_type * (o.fat_type == 32 ? 3U : 2U) / 8U; x++) 700 mk1(img[x], o.fat_type == 32 && x % 4 == 3 ? 0x0f : 0xff); 701 } else if (lsn == dir && o.volume_label) { 702 de = (struct de *)img; 703 mklabel(de->namext, o.volume_label); 704 mk1(de->attr, 050); 705 x = (u_int)tm->tm_hour << 11 | 706 (u_int)tm->tm_min << 5 | 707 (u_int)tm->tm_sec >> 1; 708 mk2(de->time, x); 709 x = (u_int)(tm->tm_year - 80) << 9 | 710 (u_int)(tm->tm_mon + 1) << 5 | 711 (u_int)tm->tm_mday; 712 mk2(de->date, x); 713 } 714 if ((n = write(fd, img, bpb.bps)) == -1) { 715 warn("%s", fname); 716 return -1; 717 } 718 if ((size_t)n != bpb.bps) { 719 warnx("%s: can't write sector %u", fname, lsn); 720 return -1; 721 } 722 } 723 } 724 return 0; 725 } 726 727 /* 728 * return -1 with error if file system is mounted. 729 */ 730 static int 731 check_mounted(const char *fname, mode_t mode) 732 { 733 struct statvfs *mp; 734 const char *s1, *s2; 735 size_t len; 736 int n, r; 737 738 if (!(n = getmntinfo(&mp, MNT_NOWAIT))) { 739 warn("getmntinfo"); 740 return -1; 741 } 742 len = strlen(_PATH_DEV); 743 s1 = fname; 744 if (!strncmp(s1, _PATH_DEV, len)) 745 s1 += len; 746 r = S_ISCHR(mode) && s1 != fname && *s1 == 'r'; 747 for (; n--; mp++) { 748 s2 = mp->f_mntfromname; 749 if (!strncmp(s2, _PATH_DEV, len)) 750 s2 += len; 751 if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) || 752 !strcmp(s1, s2)) { 753 warnx("%s is mounted on %s", fname, mp->f_mntonname); 754 return -1; 755 } 756 } 757 return 0; 758 } 759 760 /* 761 * Get a standard format. 762 */ 763 static int 764 getstdfmt(const char *fmt, struct bpb *bpb) 765 { 766 u_int x, i; 767 768 x = sizeof(stdfmt) / sizeof(stdfmt[0]); 769 for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++); 770 if (i == x) { 771 warnx("%s: unknown standard format", fmt); 772 return -1; 773 } 774 *bpb = stdfmt[i].bpb; 775 return 0; 776 } 777 778 /* 779 * Get disk slice, partition, and geometry information. 780 */ 781 static int 782 getbpbinfo(int fd, const char *fname, const char *dtype, int iflag, 783 struct bpb *bpb, int create) 784 { 785 struct disk_geom geo; 786 struct dkwedge_info dkw; 787 const char *s1, *s2; 788 int part; 789 int maxpartitions; 790 791 part = -1; 792 s1 = fname; 793 if ((s2 = strrchr(s1, '/'))) 794 s1 = s2 + 1; 795 for (s2 = s1; *s2 && !isdigit((unsigned char)*s2); s2++); 796 if (!*s2 || s2 == s1) 797 s2 = NULL; 798 else 799 while (isdigit((unsigned char)*++s2)); 800 s1 = s2; 801 802 maxpartitions = getmaxpartitions(); 803 804 if (s2 && *s2 >= 'a' && *s2 <= 'a' + maxpartitions - 1) { 805 part = *s2++ - 'a'; 806 } 807 if (((part != -1) && ((!iflag && part != -1) || !bpb->bsec)) || 808 !bpb->bps || !bpb->spt || !bpb->hds) { 809 if (create || getdiskinfo(fname, fd, NULL, &geo, &dkw) == -1) { 810 struct stat st; 811 812 if (fstat(fd, &st) == -1) { 813 warnx("Can't get disk size for `%s'", fname); 814 return -1; 815 } 816 /* create a fake geometry for a file image */ 817 geo.dg_secsize = 512; 818 geo.dg_nsectors = 63; 819 geo.dg_ntracks = 255; 820 dkw.dkw_size = st.st_size / geo.dg_secsize; 821 } 822 if (!bpb->bps) { 823 if (ckgeom(fname, geo.dg_secsize, "bytes/sector") == -1) 824 return -1; 825 bpb->bps = geo.dg_secsize; 826 } 827 828 if (geo.dg_nsectors > 63) { 829 /* 830 * The kernel doesn't accept BPB with spt > 63. 831 * (see sys/fs/msdosfs/msdosfs_vfsops.c:msdosfs_mountfs()) 832 * If values taken from disklabel don't match these 833 * restrictions, use popular BIOS default values instead. 834 */ 835 geo.dg_nsectors = 63; 836 } 837 if (!bpb->spt) { 838 if (ckgeom(fname, geo.dg_nsectors, "sectors/track") == -1) 839 return -1; 840 bpb->spt = geo.dg_nsectors; 841 } 842 if (!bpb->hds) 843 if (ckgeom(fname, geo.dg_ntracks, "drive heads") == -1) 844 return -1; 845 bpb->hds = geo.dg_ntracks; 846 if (!bpb->bsec) 847 bpb->bsec = dkw.dkw_size; 848 } 849 return 0; 850 } 851 852 /* 853 * Print out BPB values. 854 */ 855 static void 856 print_bpb(struct bpb *bpb) 857 { 858 printf("bps=%u spc=%u res=%u nft=%u", bpb->bps, bpb->spc, bpb->res, 859 bpb->nft); 860 if (bpb->rde) 861 printf(" rde=%u", bpb->rde); 862 if (bpb->sec) 863 printf(" sec=%u", bpb->sec); 864 printf(" mid=%#x", bpb->mid); 865 if (bpb->spf) 866 printf(" spf=%u", bpb->spf); 867 printf(" spt=%u hds=%u hid=%u", bpb->spt, bpb->hds, bpb->hid); 868 if (bpb->bsec) 869 printf(" bsec=%u", bpb->bsec); 870 if (!bpb->spf) { 871 printf(" bspf=%u rdcl=%u", bpb->bspf, bpb->rdcl); 872 printf(" infs="); 873 printf(bpb->infs == MAXU16 ? "%#x" : "%u", bpb->infs); 874 printf(" bkbs="); 875 printf(bpb->bkbs == MAXU16 ? "%#x" : "%u", bpb->bkbs); 876 } 877 printf("\n"); 878 } 879 880 /* 881 * Check a disk geometry value. 882 */ 883 static int 884 ckgeom(const char *fname, u_int val, const char *msg) 885 { 886 if (!val) { 887 warnx("%s: no default %s", fname, msg); 888 return -1; 889 } 890 if (val > MAXU16) { 891 warnx("%s: illegal %s", fname, msg); 892 return -1; 893 } 894 return 0; 895 } 896 /* 897 * Check a volume label. 898 */ 899 static int 900 oklabel(const char *src) 901 { 902 int c, i; 903 904 for (i = 0; i <= 11; i++) { 905 c = (u_char)*src++; 906 if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c)) 907 break; 908 } 909 return i && !c; 910 } 911 912 /* 913 * Make a volume label. 914 */ 915 static void 916 mklabel(u_int8_t *dest, const char *src) 917 { 918 int c, i; 919 920 for (i = 0; i < 11; i++) { 921 c = *src ? toupper((unsigned char)*src++) : ' '; 922 *dest++ = !i && c == '\xe5' ? 5 : c; 923 } 924 } 925 926 /* 927 * Copy string, padding with spaces. 928 */ 929 static void 930 setstr(u_int8_t *dest, const char *src, size_t len) 931 { 932 while (len--) 933 *dest++ = *src ? *src++ : ' '; 934 } 935 936 static void 937 infohandler(int sig) 938 { 939 got_siginfo = 1; 940 } 941
Indexes created Tue Sep 23 14:10:03 GMT 2025