newfs_msdos.c revision 661aff600c5cb8e72aa2892a2a75ea6015bf1457
1/* 2 * Copyright (c) 1998 Robert Nordier 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 21 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 23 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 25 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#ifndef lint 29static const char rcsid[] = 30 "$FreeBSD: src/sbin/newfs_msdos/newfs_msdos.c,v 1.33 2009/04/11 14:56:29 ed Exp $"; 31#endif /* not lint */ 32 33#include <sys/param.h> 34 35#ifndef ANDROID 36 #include <sys/fdcio.h> 37 #include <sys/disk.h> 38 #include <sys/disklabel.h> 39 #include <sys/mount.h> 40#else 41 #include <stdarg.h> 42 #include <linux/fs.h> 43 #include <linux/hdreg.h> 44#endif 45 46#include <sys/stat.h> 47#include <sys/time.h> 48 49#include <ctype.h> 50#include <err.h> 51#include <errno.h> 52#include <fcntl.h> 53#include <inttypes.h> 54#include <paths.h> 55#include <stdio.h> 56#include <stdlib.h> 57#include <string.h> 58#include <time.h> 59#include <unistd.h> 60 61#define MAXU16 0xffff /* maximum unsigned 16-bit quantity */ 62#define BPN 4 /* bits per nibble */ 63#define NPB 2 /* nibbles per byte */ 64 65#define DOSMAGIC 0xaa55 /* DOS magic number */ 66#define MINBPS 512 /* minimum bytes per sector */ 67#define MAXSPC 128 /* maximum sectors per cluster */ 68#define MAXNFT 16 /* maximum number of FATs */ 69#define DEFBLK 4096 /* default block size */ 70#define DEFBLK16 2048 /* default block size FAT16 */ 71#define DEFRDE 512 /* default root directory entries */ 72#define RESFTE 2 /* reserved FAT entries */ 73#define MINCLS12 1 /* minimum FAT12 clusters */ 74#define MINCLS16 0x1000 /* minimum FAT16 clusters */ 75#define MINCLS32 2 /* minimum FAT32 clusters */ 76#define MAXCLS12 0xfed /* maximum FAT12 clusters */ 77#define MAXCLS16 0xfff5 /* maximum FAT16 clusters */ 78#define MAXCLS32 0xffffff5 /* maximum FAT32 clusters */ 79 80#define mincls(fat) ((fat) == 12 ? MINCLS12 : \ 81 (fat) == 16 ? MINCLS16 : \ 82 MINCLS32) 83 84#define maxcls(fat) ((fat) == 12 ? MAXCLS12 : \ 85 (fat) == 16 ? MAXCLS16 : \ 86 MAXCLS32) 87 88#define mk1(p, x) \ 89 (p) = (u_int8_t)(x) 90 91#define mk2(p, x) \ 92 (p)[0] = (u_int8_t)(x), \ 93 (p)[1] = (u_int8_t)((x) >> 010) 94 95#define mk4(p, x) \ 96 (p)[0] = (u_int8_t)(x), \ 97 (p)[1] = (u_int8_t)((x) >> 010), \ 98 (p)[2] = (u_int8_t)((x) >> 020), \ 99 (p)[3] = (u_int8_t)((x) >> 030) 100 101#define argto1(arg, lo, msg) argtou(arg, lo, 0xff, msg) 102#define argto2(arg, lo, msg) argtou(arg, lo, 0xffff, msg) 103#define argto4(arg, lo, msg) argtou(arg, lo, 0xffffffff, msg) 104#define argtox(arg, lo, msg) argtou(arg, lo, UINT_MAX, msg) 105 106struct bs { 107 u_int8_t jmp[3]; /* bootstrap entry point */ 108 u_int8_t oem[8]; /* OEM name and version */ 109}; 110 111struct bsbpb { 112 u_int8_t bps[2]; /* bytes per sector */ 113 u_int8_t spc; /* sectors per cluster */ 114 u_int8_t res[2]; /* reserved sectors */ 115 u_int8_t nft; /* number of FATs */ 116 u_int8_t rde[2]; /* root directory entries */ 117 u_int8_t sec[2]; /* total sectors */ 118 u_int8_t mid; /* media descriptor */ 119 u_int8_t spf[2]; /* sectors per FAT */ 120 u_int8_t spt[2]; /* sectors per track */ 121 u_int8_t hds[2]; /* drive heads */ 122 u_int8_t hid[4]; /* hidden sectors */ 123 u_int8_t bsec[4]; /* big total sectors */ 124}; 125 126struct bsxbpb { 127 u_int8_t bspf[4]; /* big sectors per FAT */ 128 u_int8_t xflg[2]; /* FAT control flags */ 129 u_int8_t vers[2]; /* file system version */ 130 u_int8_t rdcl[4]; /* root directory start cluster */ 131 u_int8_t infs[2]; /* file system info sector */ 132 u_int8_t bkbs[2]; /* backup boot sector */ 133 u_int8_t rsvd[12]; /* reserved */ 134}; 135 136struct bsx { 137 u_int8_t drv; /* drive number */ 138 u_int8_t rsvd; /* reserved */ 139 u_int8_t sig; /* extended boot signature */ 140 u_int8_t volid[4]; /* volume ID number */ 141 u_int8_t label[11]; /* volume label */ 142 u_int8_t type[8]; /* file system type */ 143}; 144 145struct de { 146 u_int8_t namext[11]; /* name and extension */ 147 u_int8_t attr; /* attributes */ 148 u_int8_t rsvd[10]; /* reserved */ 149 u_int8_t time[2]; /* creation time */ 150 u_int8_t date[2]; /* creation date */ 151 u_int8_t clus[2]; /* starting cluster */ 152 u_int8_t size[4]; /* size */ 153}; 154 155struct bpb { 156 u_int bps; /* bytes per sector */ 157 u_int spc; /* sectors per cluster */ 158 u_int res; /* reserved sectors */ 159 u_int nft; /* number of FATs */ 160 u_int rde; /* root directory entries */ 161 u_int sec; /* total sectors */ 162 u_int mid; /* media descriptor */ 163 u_int spf; /* sectors per FAT */ 164 u_int spt; /* sectors per track */ 165 u_int hds; /* drive heads */ 166 u_int hid; /* hidden sectors */ 167 u_int bsec; /* big total sectors */ 168 u_int bspf; /* big sectors per FAT */ 169 u_int rdcl; /* root directory start cluster */ 170 u_int infs; /* file system info sector */ 171 u_int bkbs; /* backup boot sector */ 172}; 173 174#define BPBGAP 0, 0, 0, 0, 0, 0 175 176static struct { 177 const char *name; 178 struct bpb bpb; 179} const stdfmt[] = { 180 {"160", {512, 1, 1, 2, 64, 320, 0xfe, 1, 8, 1, BPBGAP}}, 181 {"180", {512, 1, 1, 2, 64, 360, 0xfc, 2, 9, 1, BPBGAP}}, 182 {"320", {512, 2, 1, 2, 112, 640, 0xff, 1, 8, 2, BPBGAP}}, 183 {"360", {512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2, BPBGAP}}, 184 {"640", {512, 2, 1, 2, 112, 1280, 0xfb, 2, 8, 2, BPBGAP}}, 185 {"720", {512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2, BPBGAP}}, 186 {"1200", {512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2, BPBGAP}}, 187 {"1232", {1024,1, 1, 2, 192, 1232, 0xfe, 2, 8, 2, BPBGAP}}, 188 {"1440", {512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2, BPBGAP}}, 189 {"2880", {512, 2, 1, 2, 240, 5760, 0xf0, 9, 36, 2, BPBGAP}} 190}; 191 192static const 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 224static void check_mounted(const char *, mode_t); 225static void getstdfmt(const char *, struct bpb *); 226static void getdiskinfo(int, const char *, const char *, int, 227 struct bpb *); 228static void print_bpb(struct bpb *); 229static u_int ckgeom(const char *, u_int, const char *); 230static u_int argtou(const char *, u_int, u_int, const char *); 231static off_t argtooff(const char *, const char *); 232static int oklabel(const char *); 233static void mklabel(u_int8_t *, const char *); 234static void setstr(u_int8_t *, const char *, size_t); 235static void usage(void); 236 237#ifdef ANDROID 238#define powerof2(x) ((((x) - 1) & (x)) == 0) 239#define howmany(x, y) (((x) + ((y) - 1)) / (y)) 240#define MAX(x,y) ((x) > (y) ? (x) : (y)) 241#define MIN(a, b) ((a) < (b) ? (a) : (b)) 242 243#endif 244/* 245 * Construct a FAT12, FAT16, or FAT32 file system. 246 */ 247int 248newfs_msdos_main(int argc, char *argv[]) 249{ 250 static const char opts[] = "@:NB:C:F:I:L:O:S:a:b:c:e:f:h:i:k:m:n:o:r:s:u:"; 251 const char *opt_B = NULL, *opt_L = NULL, *opt_O = NULL, *opt_f = NULL; 252 u_int opt_F = 0, opt_I = 0, opt_S = 0, opt_a = 0, opt_b = 0, opt_c = 0; 253 u_int opt_e = 0, opt_h = 0, opt_i = 0, opt_k = 0, opt_m = 0, opt_n = 0; 254 u_int opt_o = 0, opt_r = 0, opt_s = 0, opt_u = 0; 255 int opt_N = 0; 256 int Iflag = 0, mflag = 0, oflag = 0; 257 char buf[MAXPATHLEN]; 258 struct stat sb; 259 struct timeval tv; 260 struct bpb bpb; 261 struct tm *tm; 262 struct bs *bs; 263 struct bsbpb *bsbpb; 264 struct bsxbpb *bsxbpb; 265 struct bsx *bsx; 266 struct de *de; 267 u_int8_t *img; 268 const char *fname, *dtype, *bname; 269 ssize_t n; 270 time_t now; 271 u_int fat, bss, rds, cls, dir, lsn, x, x1, x2; 272 int ch, fd, fd1; 273 off_t opt_create = 0, opt_ofs = 0; 274 275 while ((ch = getopt(argc, argv, opts)) != -1) 276 switch (ch) { 277 case '@': 278 opt_ofs = argtooff(optarg, "offset"); 279 break; 280 case 'N': 281 opt_N = 1; 282 break; 283 case 'B': 284 opt_B = optarg; 285 break; 286 case 'C': 287 opt_create = argtooff(optarg, "create size"); 288 break; 289 case 'F': 290 if (strcmp(optarg, "12") && 291 strcmp(optarg, "16") && 292 strcmp(optarg, "32")) 293 errx(1, "%s: bad FAT type", optarg); 294 opt_F = atoi(optarg); 295 break; 296 case 'I': 297 opt_I = argto4(optarg, 0, "volume ID"); 298 Iflag = 1; 299 break; 300 case 'L': 301 if (!oklabel(optarg)) 302 errx(1, "%s: bad volume label", optarg); 303 opt_L = optarg; 304 break; 305 case 'O': 306 if (strlen(optarg) > 8) 307 errx(1, "%s: bad OEM string", optarg); 308 opt_O = optarg; 309 break; 310 case 'S': 311 opt_S = argto2(optarg, 1, "bytes/sector"); 312 break; 313 case 'a': 314 opt_a = argto4(optarg, 1, "sectors/FAT"); 315 break; 316 case 'b': 317 opt_b = argtox(optarg, 1, "block size"); 318 opt_c = 0; 319 break; 320 case 'c': 321 opt_c = argto1(optarg, 1, "sectors/cluster"); 322 opt_b = 0; 323 break; 324 case 'e': 325 opt_e = argto2(optarg, 1, "directory entries"); 326 break; 327 case 'f': 328 opt_f = optarg; 329 break; 330 case 'h': 331 opt_h = argto2(optarg, 1, "drive heads"); 332 break; 333 case 'i': 334 opt_i = argto2(optarg, 1, "info sector"); 335 break; 336 case 'k': 337 opt_k = argto2(optarg, 1, "backup sector"); 338 break; 339 case 'm': 340 opt_m = argto1(optarg, 0, "media descriptor"); 341 mflag = 1; 342 break; 343 case 'n': 344 opt_n = argto1(optarg, 1, "number of FATs"); 345 break; 346 case 'o': 347 opt_o = argto4(optarg, 0, "hidden sectors"); 348 oflag = 1; 349 break; 350 case 'r': 351 opt_r = argto2(optarg, 1, "reserved sectors"); 352 break; 353 case 's': 354 opt_s = argto4(optarg, 1, "file system size"); 355 break; 356 case 'u': 357 opt_u = argto2(optarg, 1, "sectors/track"); 358 break; 359 default: 360 usage(); 361 } 362 argc -= optind; 363 argv += optind; 364 if (argc < 1 || argc > 2) 365 usage(); 366 fname = *argv++; 367 if (!opt_create && !strchr(fname, '/')) { 368 snprintf(buf, sizeof(buf), "%s%s", _PATH_DEV, fname); 369 if (!(fname = strdup(buf))) 370 err(1, NULL); 371 } 372 dtype = *argv; 373 if (opt_create) { 374 if (opt_N) 375 errx(1, "create (-C) is incompatible with -N"); 376 fd = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0644); 377 if (fd == -1) 378 errx(1, "failed to create %s", fname); 379 if (ftruncate(fd, opt_create)) 380 errx(1, "failed to initialize %jd bytes", (intmax_t)opt_create); 381 } else if ((fd = open(fname, opt_N ? O_RDONLY : O_RDWR)) == -1) 382 err(1, "%s", fname); 383 if (fstat(fd, &sb)) 384 err(1, "%s", fname); 385 if (opt_create) { 386 if (!S_ISREG(sb.st_mode)) 387 warnx("warning, %s is not a regular file", fname); 388 } else { 389 if (!S_ISCHR(sb.st_mode)) 390 warnx("warning, %s is not a character device", fname); 391 } 392 if (!opt_N) 393 check_mounted(fname, sb.st_mode); 394 if (opt_ofs && opt_ofs != lseek(fd, opt_ofs, SEEK_SET)) 395 errx(1, "cannot seek to %jd", (intmax_t)opt_ofs); 396 memset(&bpb, 0, sizeof(bpb)); 397 if (opt_f) { 398 getstdfmt(opt_f, &bpb); 399 bpb.bsec = bpb.sec; 400 bpb.sec = 0; 401 bpb.bspf = bpb.spf; 402 bpb.spf = 0; 403 } 404 if (opt_h) 405 bpb.hds = opt_h; 406 if (opt_u) 407 bpb.spt = opt_u; 408 if (opt_S) 409 bpb.bps = opt_S; 410 if (opt_s) 411 bpb.bsec = opt_s; 412 if (oflag) 413 bpb.hid = opt_o; 414 if (!(opt_f || (opt_h && opt_u && opt_S && opt_s && oflag))) { 415 off_t delta; 416 getdiskinfo(fd, fname, dtype, oflag, &bpb); 417 if (opt_s) { 418 bpb.bsec = opt_s; 419 } 420 bpb.bsec -= (opt_ofs / bpb.bps); 421 delta = bpb.bsec % bpb.spt; 422 if (delta != 0) { 423 warnx("trim %d sectors from %d to adjust to a multiple of %d", 424 (int)delta, bpb.bsec, bpb.spt); 425 bpb.bsec -= delta; 426 } 427 if (bpb.spc == 0) { /* set defaults */ 428 if (bpb.bsec <= 6000) /* about 3MB -> 512 bytes */ 429 bpb.spc = 1; 430 else if (bpb.bsec <= (1<<17)) /* 64M -> 4k */ 431 bpb.spc = 8; 432 else if (bpb.bsec <= (1<<19)) /* 256M -> 8k */ 433 bpb.spc = 16; 434 else if (bpb.bsec <= (1<<21)) /* 1G -> 16k */ 435 bpb.spc = 32; 436 else 437 bpb.spc = 64; /* otherwise 32k */ 438 } 439 } 440 if (!powerof2(bpb.bps)) 441 errx(1, "bytes/sector (%u) is not a power of 2", bpb.bps); 442 if (bpb.bps < MINBPS) 443 errx(1, "bytes/sector (%u) is too small; minimum is %u", 444 bpb.bps, MINBPS); 445 if (!(fat = opt_F)) { 446 if (opt_f) 447 fat = 12; 448 else if (!opt_e && (opt_i || opt_k)) 449 fat = 32; 450 } 451 if ((fat == 32 && opt_e) || (fat != 32 && (opt_i || opt_k))) 452 errx(1, "-%c is not a legal FAT%s option", 453 fat == 32 ? 'e' : opt_i ? 'i' : 'k', 454 fat == 32 ? "32" : "12/16"); 455 if (opt_f && fat == 32) 456 bpb.rde = 0; 457 if (opt_b) { 458 if (!powerof2(opt_b)) 459 errx(1, "block size (%u) is not a power of 2", opt_b); 460 if (opt_b < bpb.bps) 461 errx(1, "block size (%u) is too small; minimum is %u", 462 opt_b, bpb.bps); 463 if (opt_b > bpb.bps * MAXSPC) 464 errx(1, "block size (%u) is too large; maximum is %u", 465 opt_b, bpb.bps * MAXSPC); 466 bpb.spc = opt_b / bpb.bps; 467 } 468 if (opt_c) { 469 if (!powerof2(opt_c)) 470 errx(1, "sectors/cluster (%u) is not a power of 2", opt_c); 471 bpb.spc = opt_c; 472 } 473 if (opt_r) 474 bpb.res = opt_r; 475 if (opt_n) { 476 if (opt_n > MAXNFT) 477 errx(1, "number of FATs (%u) is too large; maximum is %u", 478 opt_n, MAXNFT); 479 bpb.nft = opt_n; 480 } 481 if (opt_e) 482 bpb.rde = opt_e; 483 if (mflag) { 484 if (opt_m < 0xf0) 485 errx(1, "illegal media descriptor (%#x)", opt_m); 486 bpb.mid = opt_m; 487 } 488 if (opt_a) 489 bpb.bspf = opt_a; 490 if (opt_i) 491 bpb.infs = opt_i; 492 if (opt_k) 493 bpb.bkbs = opt_k; 494 bss = 1; 495 bname = NULL; 496 fd1 = -1; 497 if (opt_B) { 498 bname = opt_B; 499 if (!strchr(bname, '/')) { 500 snprintf(buf, sizeof(buf), "/boot/%s", bname); 501 if (!(bname = strdup(buf))) 502 err(1, NULL); 503 } 504 if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb)) 505 err(1, "%s", bname); 506 if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bps || 507 sb.st_size < bpb.bps || sb.st_size > bpb.bps * MAXU16) 508 errx(1, "%s: inappropriate file type or format", bname); 509 bss = sb.st_size / bpb.bps; 510 } 511 if (!bpb.nft) 512 bpb.nft = 2; 513 if (!fat) { 514 if (bpb.bsec < (bpb.res ? bpb.res : bss) + 515 howmany((RESFTE + (bpb.spc ? MINCLS16 : MAXCLS12 + 1)) * 516 ((bpb.spc ? 16 : 12) / BPN), bpb.bps * NPB) * 517 bpb.nft + 518 howmany(bpb.rde ? bpb.rde : DEFRDE, 519 bpb.bps / sizeof(struct de)) + 520 (bpb.spc ? MINCLS16 : MAXCLS12 + 1) * 521 (bpb.spc ? bpb.spc : howmany(DEFBLK, bpb.bps))) 522 fat = 12; 523 else if (bpb.rde || bpb.bsec < 524 (bpb.res ? bpb.res : bss) + 525 howmany((RESFTE + MAXCLS16) * 2, bpb.bps) * bpb.nft + 526 howmany(DEFRDE, bpb.bps / sizeof(struct de)) + 527 (MAXCLS16 + 1) * 528 (bpb.spc ? bpb.spc : howmany(8192, bpb.bps))) 529 fat = 16; 530 else 531 fat = 32; 532 } 533 x = bss; 534 if (fat == 32) { 535 if (!bpb.infs) { 536 if (x == MAXU16 || x == bpb.bkbs) 537 errx(1, "no room for info sector"); 538 bpb.infs = x; 539 } 540 if (bpb.infs != MAXU16 && x <= bpb.infs) 541 x = bpb.infs + 1; 542 if (!bpb.bkbs) { 543 if (x == MAXU16) 544 errx(1, "no room for backup sector"); 545 bpb.bkbs = x; 546 } else if (bpb.bkbs != MAXU16 && bpb.bkbs == bpb.infs) 547 errx(1, "backup sector would overwrite info sector"); 548 if (bpb.bkbs != MAXU16 && x <= bpb.bkbs) 549 x = bpb.bkbs + 1; 550 } 551 if (!bpb.res) 552 bpb.res = fat == 32 ? MAX(x, MAX(16384 / bpb.bps, 4)) : x; 553 else if (bpb.res < x) 554 errx(1, "too few reserved sectors"); 555 if (fat != 32 && !bpb.rde) 556 bpb.rde = DEFRDE; 557 rds = howmany(bpb.rde, bpb.bps / sizeof(struct de)); 558 if (!bpb.spc) 559 for (bpb.spc = howmany(fat == 16 ? DEFBLK16 : DEFBLK, bpb.bps); 560 bpb.spc < MAXSPC && 561 bpb.res + 562 howmany((RESFTE + maxcls(fat)) * (fat / BPN), 563 bpb.bps * NPB) * bpb.nft + 564 rds + 565 (u_int64_t)(maxcls(fat) + 1) * bpb.spc <= bpb.bsec; 566 bpb.spc <<= 1); 567 if (fat != 32 && bpb.bspf > MAXU16) 568 errx(1, "too many sectors/FAT for FAT12/16"); 569 x1 = bpb.res + rds; 570 x = bpb.bspf ? bpb.bspf : 1; 571 if (x1 + (u_int64_t)x * bpb.nft > bpb.bsec) 572 errx(1, "meta data exceeds file system size"); 573 x1 += x * bpb.nft; 574 x = (u_int64_t)(bpb.bsec - x1) * bpb.bps * NPB / 575 (bpb.spc * bpb.bps * NPB + fat / BPN * bpb.nft); 576 x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN), 577 bpb.bps * NPB); 578 if (!bpb.bspf) { 579 bpb.bspf = x2; 580 x1 += (bpb.bspf - 1) * bpb.nft; 581 } 582 cls = (bpb.bsec - x1) / bpb.spc; 583 x = (u_int64_t)bpb.bspf * bpb.bps * NPB / (fat / BPN) - RESFTE; 584 if (cls > x) 585 cls = x; 586 if (bpb.bspf < x2) 587 warnx("warning: sectors/FAT limits file system to %u clusters", 588 cls); 589 if (cls < mincls(fat)) 590 errx(1, "%u clusters too few clusters for FAT%u, need %u", cls, fat, 591 mincls(fat)); 592 if (cls > maxcls(fat)) { 593 cls = maxcls(fat); 594 bpb.bsec = x1 + (cls + 1) * bpb.spc - 1; 595 warnx("warning: FAT type limits file system to %u sectors", 596 bpb.bsec); 597 } 598 printf("%s: %u sector%s in %u FAT%u cluster%s " 599 "(%u bytes/cluster)\n", fname, cls * bpb.spc, 600 cls * bpb.spc == 1 ? "" : "s", cls, fat, 601 cls == 1 ? "" : "s", bpb.bps * bpb.spc); 602 if (!bpb.mid) 603 bpb.mid = !bpb.hid ? 0xf0 : 0xf8; 604 if (fat == 32) 605 bpb.rdcl = RESFTE; 606 if (bpb.hid + bpb.bsec <= MAXU16) { 607 bpb.sec = bpb.bsec; 608 bpb.bsec = 0; 609 } 610 if (fat != 32) { 611 bpb.spf = bpb.bspf; 612 bpb.bspf = 0; 613 } 614 print_bpb(&bpb); 615 if (!opt_N) { 616 gettimeofday(&tv, NULL); 617 now = tv.tv_sec; 618 tm = localtime(&now); 619 if (!(img = malloc(bpb.bps))) 620 err(1, NULL); 621 dir = bpb.res + (bpb.spf ? bpb.spf : bpb.bspf) * bpb.nft; 622 for (lsn = 0; lsn < dir + (fat == 32 ? bpb.spc : rds); lsn++) { 623 x = lsn; 624 if (opt_B && 625 fat == 32 && bpb.bkbs != MAXU16 && 626 bss <= bpb.bkbs && x >= bpb.bkbs) { 627 x -= bpb.bkbs; 628 if (!x && lseek(fd1, opt_ofs, SEEK_SET)) 629 err(1, "%s", bname); 630 } 631 if (opt_B && x < bss) { 632 if ((n = read(fd1, img, bpb.bps)) == -1) 633 err(1, "%s", bname); 634 if ((unsigned)n != bpb.bps) 635 errx(1, "%s: can't read sector %u", bname, x); 636 } else 637 memset(img, 0, bpb.bps); 638 if (!lsn || 639 (fat == 32 && bpb.bkbs != MAXU16 && lsn == bpb.bkbs)) { 640 x1 = sizeof(struct bs); 641 bsbpb = (struct bsbpb *)(img + x1); 642 mk2(bsbpb->bps, bpb.bps); 643 mk1(bsbpb->spc, bpb.spc); 644 mk2(bsbpb->res, bpb.res); 645 mk1(bsbpb->nft, bpb.nft); 646 mk2(bsbpb->rde, bpb.rde); 647 mk2(bsbpb->sec, bpb.sec); 648 mk1(bsbpb->mid, bpb.mid); 649 mk2(bsbpb->spf, bpb.spf); 650 mk2(bsbpb->spt, bpb.spt); 651 mk2(bsbpb->hds, bpb.hds); 652 mk4(bsbpb->hid, bpb.hid); 653 mk4(bsbpb->bsec, bpb.bsec); 654 x1 += sizeof(struct bsbpb); 655 if (fat == 32) { 656 bsxbpb = (struct bsxbpb *)(img + x1); 657 mk4(bsxbpb->bspf, bpb.bspf); 658 mk2(bsxbpb->xflg, 0); 659 mk2(bsxbpb->vers, 0); 660 mk4(bsxbpb->rdcl, bpb.rdcl); 661 mk2(bsxbpb->infs, bpb.infs); 662 mk2(bsxbpb->bkbs, bpb.bkbs); 663 x1 += sizeof(struct bsxbpb); 664 } 665 bsx = (struct bsx *)(img + x1); 666 mk1(bsx->sig, 0x29); 667 if (Iflag) 668 x = opt_I; 669 else 670 x = (((u_int)(1 + tm->tm_mon) << 8 | 671 (u_int)tm->tm_mday) + 672 ((u_int)tm->tm_sec << 8 | 673 (u_int)(tv.tv_usec / 10))) << 16 | 674 ((u_int)(1900 + tm->tm_year) + 675 ((u_int)tm->tm_hour << 8 | 676 (u_int)tm->tm_min)); 677 mk4(bsx->volid, x); 678 mklabel(bsx->label, opt_L ? opt_L : "NO NAME"); 679 sprintf(buf, "FAT%u", fat); 680 setstr(bsx->type, buf, sizeof(bsx->type)); 681 if (!opt_B) { 682 x1 += sizeof(struct bsx); 683 bs = (struct bs *)img; 684 mk1(bs->jmp[0], 0xeb); 685 mk1(bs->jmp[1], x1 - 2); 686 mk1(bs->jmp[2], 0x90); 687 setstr(bs->oem, opt_O ? opt_O : "BSD 4.4", 688 sizeof(bs->oem)); 689 memcpy(img + x1, bootcode, sizeof(bootcode)); 690 mk2(img + MINBPS - 2, DOSMAGIC); 691 } 692 } else if (fat == 32 && bpb.infs != MAXU16 && 693 (lsn == bpb.infs || 694 (bpb.bkbs != MAXU16 && 695 lsn == bpb.bkbs + bpb.infs))) { 696 mk4(img, 0x41615252); 697 mk4(img + MINBPS - 28, 0x61417272); 698 mk4(img + MINBPS - 24, 0xffffffff); 699 mk4(img + MINBPS - 20, bpb.rdcl); 700 mk2(img + MINBPS - 2, DOSMAGIC); 701 } else if (lsn >= bpb.res && lsn < dir && 702 !((lsn - bpb.res) % 703 (bpb.spf ? bpb.spf : bpb.bspf))) { 704 mk1(img[0], bpb.mid); 705 for (x = 1; x < fat * (fat == 32 ? 3 : 2) / 8; x++) 706 mk1(img[x], fat == 32 && x % 4 == 3 ? 0x0f : 0xff); 707 } else if (lsn == dir && opt_L) { 708 de = (struct de *)img; 709 mklabel(de->namext, opt_L); 710 mk1(de->attr, 050); 711 x = (u_int)tm->tm_hour << 11 | 712 (u_int)tm->tm_min << 5 | 713 (u_int)tm->tm_sec >> 1; 714 mk2(de->time, x); 715 x = (u_int)(tm->tm_year - 80) << 9 | 716 (u_int)(tm->tm_mon + 1) << 5 | 717 (u_int)tm->tm_mday; 718 mk2(de->date, x); 719 } 720 if ((n = write(fd, img, bpb.bps)) == -1) 721 err(1, "%s", fname); 722 if ((unsigned)n != bpb.bps) { 723 errx(1, "%s: can't write sector %u", fname, lsn); 724 exit(1); 725 } 726 } 727 } 728 return 0; 729} 730 731/* 732 * Exit with error if file system is mounted. 733 */ 734static void 735check_mounted(const char *fname, mode_t mode) 736{ 737 struct statfs *mp; 738 const char *s1, *s2; 739 size_t len; 740 int n, r; 741 742#ifdef ANDROID 743 warnx("Skipping mount checks"); 744#else 745 if (!(n = getmntinfo(&mp, MNT_NOWAIT))) 746 err(1, "getmntinfo"); 747 len = strlen(_PATH_DEV); 748 s1 = fname; 749 if (!strncmp(s1, _PATH_DEV, len)) 750 s1 += len; 751 r = S_ISCHR(mode) && s1 != fname && *s1 == 'r'; 752 for (; n--; mp++) { 753 s2 = mp->f_mntfromname; 754 if (!strncmp(s2, _PATH_DEV, len)) 755 s2 += len; 756 if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) || 757 !strcmp(s1, s2)) 758 errx(1, "%s is mounted on %s", fname, mp->f_mntonname); 759 } 760#endif 761} 762 763/* 764 * Get a standard format. 765 */ 766static void 767getstdfmt(const char *fmt, struct bpb *bpb) 768{ 769 u_int x, i; 770 771 x = sizeof(stdfmt) / sizeof(stdfmt[0]); 772 for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++); 773 if (i == x) 774 errx(1, "%s: unknown standard format", fmt); 775 *bpb = stdfmt[i].bpb; 776} 777 778/* 779 * Get disk slice, partition, and geometry information. 780 */ 781 782#ifdef ANDROID 783static void 784getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag, 785 struct bpb *bpb) 786{ 787 struct hd_geometry geom; 788 789 if (ioctl(fd, BLKSSZGET, &bpb->bps)) { 790 fprintf(stderr, "Error getting bytes / sector (%s)\n", strerror(errno)); 791 exit(1); 792 } 793 794 ckgeom(fname, bpb->bps, "bytes/sector"); 795 796 if (ioctl(fd, BLKGETSIZE, &bpb->bsec)) { 797 fprintf(stderr, "Error getting blocksize (%s)\n", strerror(errno)); 798 exit(1); 799 } 800 801 if (ioctl(fd, HDIO_GETGEO, &geom)) { 802 fprintf(stderr, "Error getting gemoetry (%s) - trying sane values\n", strerror(errno)); 803 geom.heads = 64; 804 geom.sectors = 63; 805 } 806 807 if (!geom.heads) { 808 printf("Bogus heads from kernel - setting sane value\n"); 809 geom.heads = 64; 810 } 811 812 if (!geom.sectors) { 813 printf("Bogus sectors from kernel - setting sane value\n"); 814 geom.sectors = 63; 815 } 816 817 bpb->spt = geom.sectors; 818 ckgeom(fname, bpb->spt, "sectors/track"); 819 820 bpb->hds = geom.heads; 821 ckgeom(fname, bpb->hds, "drive heads"); 822} 823 824#else 825 826static void 827getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag, 828 struct bpb *bpb) 829{ 830 struct disklabel *lp, dlp; 831 struct fd_type type; 832 off_t ms, hs = 0; 833 834 lp = NULL; 835 836 /* If the user specified a disk type, try to use that */ 837 if (dtype != NULL) { 838 lp = getdiskbyname(dtype); 839 } 840 841 /* Maybe it's a floppy drive */ 842 if (lp == NULL) { 843 if (ioctl(fd, DIOCGMEDIASIZE, &ms) == -1) { 844 struct stat st; 845 846 if (fstat(fd, &st)) 847 err(1, "Cannot get disk size"); 848 /* create a fake geometry for a file image */ 849 ms = st.st_size; 850 dlp.d_secsize = 512; 851 dlp.d_nsectors = 63; 852 dlp.d_ntracks = 255; 853 dlp.d_secperunit = ms / dlp.d_secsize; 854 lp = &dlp; 855 } else if (ioctl(fd, FD_GTYPE, &type) != -1) { 856 dlp.d_secsize = 128 << type.secsize; 857 dlp.d_nsectors = type.sectrac; 858 dlp.d_ntracks = type.heads; 859 dlp.d_secperunit = ms / dlp.d_secsize; 860 lp = &dlp; 861 } 862 } 863 864 /* Maybe it's a fixed drive */ 865 if (lp == NULL) { 866 if (ioctl(fd, DIOCGDINFO, &dlp) == -1) { 867 if (bpb->bps == 0 && ioctl(fd, DIOCGSECTORSIZE, &dlp.d_secsize) == -1) 868 errx(1, "Cannot get sector size, %s", strerror(errno)); 869 870 /* XXX Should we use bpb->bps if it's set? */ 871 dlp.d_secperunit = ms / dlp.d_secsize; 872 873 if (bpb->spt == 0 && ioctl(fd, DIOCGFWSECTORS, &dlp.d_nsectors) == -1) { 874 warnx("Cannot get number of sectors per track, %s", strerror(errno)); 875 dlp.d_nsectors = 63; 876 } 877 if (bpb->hds == 0 && ioctl(fd, DIOCGFWHEADS, &dlp.d_ntracks) == -1) { 878 warnx("Cannot get number of heads, %s", strerror(errno)); 879 if (dlp.d_secperunit <= 63*1*1024) 880 dlp.d_ntracks = 1; 881 else if (dlp.d_secperunit <= 63*16*1024) 882 dlp.d_ntracks = 16; 883 else 884 dlp.d_ntracks = 255; 885 } 886 } 887 888 hs = (ms / dlp.d_secsize) - dlp.d_secperunit; 889 lp = &dlp; 890 } 891 892 if (bpb->bps == 0) 893 bpb->bps = ckgeom(fname, lp->d_secsize, "bytes/sector"); 894 if (bpb->spt == 0) 895 bpb->spt = ckgeom(fname, lp->d_nsectors, "sectors/track"); 896 if (bpb->hds == 0) 897 bpb->hds = ckgeom(fname, lp->d_ntracks, "drive heads"); 898 if (bpb->bsec == 0) 899 bpb->bsec = lp->d_secperunit; 900 if (bpb->hid == 0) 901 bpb->hid = hs; 902} 903#endif 904 905/* 906 * Print out BPB values. 907 */ 908static void 909print_bpb(struct bpb *bpb) 910{ 911 printf("bps=%u spc=%u res=%u nft=%u", bpb->bps, bpb->spc, bpb->res, 912 bpb->nft); 913 if (bpb->rde) 914 printf(" rde=%u", bpb->rde); 915 if (bpb->sec) 916 printf(" sec=%u", bpb->sec); 917 printf(" mid=%#x", bpb->mid); 918 if (bpb->spf) 919 printf(" spf=%u", bpb->spf); 920 printf(" spt=%u hds=%u hid=%u", bpb->spt, bpb->hds, bpb->hid); 921 if (bpb->bsec) 922 printf(" bsec=%u", bpb->bsec); 923 if (!bpb->spf) { 924 printf(" bspf=%u rdcl=%u", bpb->bspf, bpb->rdcl); 925 printf(" infs="); 926 printf(bpb->infs == MAXU16 ? "%#x" : "%u", bpb->infs); 927 printf(" bkbs="); 928 printf(bpb->bkbs == MAXU16 ? "%#x" : "%u", bpb->bkbs); 929 } 930 printf("\n"); 931} 932 933/* 934 * Check a disk geometry value. 935 */ 936static u_int 937ckgeom(const char *fname, u_int val, const char *msg) 938{ 939 if (!val) 940 errx(1, "%s: no default %s", fname, msg); 941 if (val > MAXU16) 942 errx(1, "%s: illegal %s %d", fname, msg, val); 943 return val; 944} 945 946/* 947 * Convert and check a numeric option argument. 948 */ 949static u_int 950argtou(const char *arg, u_int lo, u_int hi, const char *msg) 951{ 952 char *s; 953 u_long x; 954 955 errno = 0; 956 x = strtoul(arg, &s, 0); 957 if (errno || !*arg || *s || x < lo || x > hi) 958 errx(1, "%s: bad %s", arg, msg); 959 return x; 960} 961 962/* 963 * Same for off_t, with optional skmgpP suffix 964 */ 965static off_t 966argtooff(const char *arg, const char *msg) 967{ 968 char *s; 969 off_t x; 970 971 x = strtoll(arg, &s, 0); 972 /* allow at most one extra char */ 973 if (errno || x < 0 || (s[0] && s[1]) ) 974 errx(1, "%s: bad %s", arg, msg); 975 if (*s) { /* the extra char is the multiplier */ 976 switch (*s) { 977 default: 978 errx(1, "%s: bad %s", arg, msg); 979 /* notreached */ 980 981 case 's': /* sector */ 982 case 'S': 983 x <<= 9; /* times 512 */ 984 break; 985 986 case 'k': /* kilobyte */ 987 case 'K': 988 x <<= 10; /* times 1024 */ 989 break; 990 991 case 'm': /* megabyte */ 992 case 'M': 993 x <<= 20; /* times 1024*1024 */ 994 break; 995 996 case 'g': /* gigabyte */ 997 case 'G': 998 x <<= 30; /* times 1024*1024*1024 */ 999 break; 1000 1001 case 'p': /* partition start */ 1002 case 'P': /* partition start */ 1003 case 'l': /* partition length */ 1004 case 'L': /* partition length */ 1005 errx(1, "%s: not supported yet %s", arg, msg); 1006 /* notreached */ 1007 } 1008 } 1009 return x; 1010} 1011 1012/* 1013 * Check a volume label. 1014 */ 1015static int 1016oklabel(const char *src) 1017{ 1018 int c, i; 1019 1020 for (i = 0; i <= 11; i++) { 1021 c = (u_char)*src++; 1022 if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c)) 1023 break; 1024 } 1025 return i && !c; 1026} 1027 1028/* 1029 * Make a volume label. 1030 */ 1031static void 1032mklabel(u_int8_t *dest, const char *src) 1033{ 1034 int c, i; 1035 1036 for (i = 0; i < 11; i++) { 1037 c = *src ? toupper(*src++) : ' '; 1038 *dest++ = !i && c == '\xe5' ? 5 : c; 1039 } 1040} 1041 1042/* 1043 * Copy string, padding with spaces. 1044 */ 1045static void 1046setstr(u_int8_t *dest, const char *src, size_t len) 1047{ 1048 while (len--) 1049 *dest++ = *src ? *src++ : ' '; 1050} 1051 1052/* 1053 * Print usage message. 1054 */ 1055static void 1056usage(void) 1057{ 1058 fprintf(stderr, 1059 "usage: newfs_msdos [ -options ] special [disktype]\n" 1060 "where the options are:\n" 1061 "\t-@ create file system at specified offset\n" 1062 "\t-B get bootstrap from file\n" 1063 "\t-C create image file with specified size\n" 1064 "\t-F FAT type (12, 16, or 32)\n" 1065 "\t-I volume ID\n" 1066 "\t-L volume label\n" 1067 "\t-N don't create file system: just print out parameters\n" 1068 "\t-O OEM string\n" 1069 "\t-S bytes/sector\n" 1070 "\t-a sectors/FAT\n" 1071 "\t-b block size\n" 1072 "\t-c sectors/cluster\n" 1073 "\t-e root directory entries\n" 1074 "\t-f standard format\n" 1075 "\t-h drive heads\n" 1076 "\t-i file system info sector\n" 1077 "\t-k backup boot sector\n" 1078 "\t-m media descriptor\n" 1079 "\t-n number of FATs\n" 1080 "\t-o hidden sectors\n" 1081 "\t-r reserved sectors\n" 1082 "\t-s file system size (sectors)\n" 1083 "\t-u sectors/track\n"); 1084 exit(1); 1085} 1086