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      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
     29 static 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 
    106 struct bs {
    107     u_int8_t jmp[3];		/* bootstrap entry point */
    108     u_int8_t oem[8];		/* OEM name and version */
    109 };
    110 
    111 struct 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 
    126 struct 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 
    136 struct 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 
    145 struct 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 
    155 struct 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 
    176 static 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 
    192 static 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 
    224 static void check_mounted(const char *, mode_t);
    225 static void getstdfmt(const char *, struct bpb *);
    226 static void getdiskinfo(int, const char *, const char *, int,
    227 			struct bpb *);
    228 static void print_bpb(struct bpb *);
    229 static u_int ckgeom(const char *, u_int, const char *);
    230 static u_int argtou(const char *, u_int, u_int, const char *);
    231 static off_t argtooff(const char *, const char *);
    232 static int oklabel(const char *);
    233 static void mklabel(u_int8_t *, const char *);
    234 static void setstr(u_int8_t *, const char *, size_t);
    235 static 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  */
    247 int
    248 newfs_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<<22)) /* 2G -> 16k, some versions of windows
    435 					     require a minimum of 65527 clusters */
    436 		bpb.spc = 32;
    437 	    else
    438 		bpb.spc = 64;		/* otherwise 32k */
    439 	}
    440     }
    441     if (!powerof2(bpb.bps))
    442 	errx(1, "bytes/sector (%u) is not a power of 2", bpb.bps);
    443     if (bpb.bps < MINBPS)
    444 	errx(1, "bytes/sector (%u) is too small; minimum is %u",
    445 	     bpb.bps, MINBPS);
    446     if (!(fat = opt_F)) {
    447 	if (opt_f)
    448 	    fat = 12;
    449 	else if (!opt_e && (opt_i || opt_k))
    450 	    fat = 32;
    451     }
    452     if ((fat == 32 && opt_e) || (fat != 32 && (opt_i || opt_k)))
    453 	errx(1, "-%c is not a legal FAT%s option",
    454 	     fat == 32 ? 'e' : opt_i ? 'i' : 'k',
    455 	     fat == 32 ? "32" : "12/16");
    456     if (opt_f && fat == 32)
    457 	bpb.rde = 0;
    458     if (opt_b) {
    459 	if (!powerof2(opt_b))
    460 	    errx(1, "block size (%u) is not a power of 2", opt_b);
    461 	if (opt_b < bpb.bps)
    462 	    errx(1, "block size (%u) is too small; minimum is %u",
    463 		 opt_b, bpb.bps);
    464 	if (opt_b > bpb.bps * MAXSPC)
    465 	    errx(1, "block size (%u) is too large; maximum is %u",
    466 		 opt_b, bpb.bps * MAXSPC);
    467 	bpb.spc = opt_b / bpb.bps;
    468     }
    469     if (opt_c) {
    470 	if (!powerof2(opt_c))
    471 	    errx(1, "sectors/cluster (%u) is not a power of 2", opt_c);
    472 	bpb.spc = opt_c;
    473     }
    474     if (opt_r)
    475 	bpb.res = opt_r;
    476     if (opt_n) {
    477 	if (opt_n > MAXNFT)
    478 	    errx(1, "number of FATs (%u) is too large; maximum is %u",
    479 		 opt_n, MAXNFT);
    480 	bpb.nft = opt_n;
    481     }
    482     if (opt_e)
    483 	bpb.rde = opt_e;
    484     if (mflag) {
    485 	if (opt_m < 0xf0)
    486 	    errx(1, "illegal media descriptor (%#x)", opt_m);
    487 	bpb.mid = opt_m;
    488     }
    489     if (opt_a)
    490 	bpb.bspf = opt_a;
    491     if (opt_i)
    492 	bpb.infs = opt_i;
    493     if (opt_k)
    494 	bpb.bkbs = opt_k;
    495     bss = 1;
    496     bname = NULL;
    497     fd1 = -1;
    498     if (opt_B) {
    499 	bname = opt_B;
    500 	if (!strchr(bname, '/')) {
    501 	    snprintf(buf, sizeof(buf), "/boot/%s", bname);
    502 	    if (!(bname = strdup(buf)))
    503 		err(1, NULL);
    504 	}
    505 	if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb))
    506 	    err(1, "%s", bname);
    507 	if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bps ||
    508 	    sb.st_size < bpb.bps || sb.st_size > bpb.bps * MAXU16)
    509 	    errx(1, "%s: inappropriate file type or format", bname);
    510 	bss = sb.st_size / bpb.bps;
    511     }
    512     if (!bpb.nft)
    513 	bpb.nft = 2;
    514     if (!fat) {
    515 	if (bpb.bsec < (bpb.res ? bpb.res : bss) +
    516 	    howmany((RESFTE + (bpb.spc ? MINCLS16 : MAXCLS12 + 1)) *
    517 		    ((bpb.spc ? 16 : 12) / BPN), bpb.bps * NPB) *
    518 	    bpb.nft +
    519 	    howmany(bpb.rde ? bpb.rde : DEFRDE,
    520 		    bpb.bps / sizeof(struct de)) +
    521 	    (bpb.spc ? MINCLS16 : MAXCLS12 + 1) *
    522 	    (bpb.spc ? bpb.spc : howmany(DEFBLK, bpb.bps)))
    523 	    fat = 12;
    524 	else if (bpb.rde || bpb.bsec <
    525 		 (bpb.res ? bpb.res : bss) +
    526 		 howmany((RESFTE + MAXCLS16) * 2, bpb.bps) * bpb.nft +
    527 		 howmany(DEFRDE, bpb.bps / sizeof(struct de)) +
    528 		 (MAXCLS16 + 1) *
    529 		 (bpb.spc ? bpb.spc : howmany(8192, bpb.bps)))
    530 	    fat = 16;
    531 	else
    532 	    fat = 32;
    533     }
    534     x = bss;
    535     if (fat == 32) {
    536 	if (!bpb.infs) {
    537 	    if (x == MAXU16 || x == bpb.bkbs)
    538 		errx(1, "no room for info sector");
    539 	    bpb.infs = x;
    540 	}
    541 	if (bpb.infs != MAXU16 && x <= bpb.infs)
    542 	    x = bpb.infs + 1;
    543 	if (!bpb.bkbs) {
    544 	    if (x == MAXU16)
    545 		errx(1, "no room for backup sector");
    546 	    bpb.bkbs = x;
    547 	} else if (bpb.bkbs != MAXU16 && bpb.bkbs == bpb.infs)
    548 	    errx(1, "backup sector would overwrite info sector");
    549 	if (bpb.bkbs != MAXU16 && x <= bpb.bkbs)
    550 	    x = bpb.bkbs + 1;
    551     }
    552     if (!bpb.res)
    553 	bpb.res = fat == 32 ? MAX(x, MAX(16384 / bpb.bps, 4)) : x;
    554     else if (bpb.res < x)
    555 	errx(1, "too few reserved sectors");
    556     if (fat != 32 && !bpb.rde)
    557 	bpb.rde = DEFRDE;
    558     rds = howmany(bpb.rde, bpb.bps / sizeof(struct de));
    559     if (!bpb.spc)
    560 	for (bpb.spc = howmany(fat == 16 ? DEFBLK16 : DEFBLK, bpb.bps);
    561 	     bpb.spc < MAXSPC &&
    562 	     bpb.res +
    563 	     howmany((RESFTE + maxcls(fat)) * (fat / BPN),
    564 		     bpb.bps * NPB) * bpb.nft +
    565 	     rds +
    566 	     (u_int64_t)(maxcls(fat) + 1) * bpb.spc <= bpb.bsec;
    567 	     bpb.spc <<= 1);
    568     if (fat != 32 && bpb.bspf > MAXU16)
    569 	errx(1, "too many sectors/FAT for FAT12/16");
    570     x1 = bpb.res + rds;
    571     x = bpb.bspf ? bpb.bspf : 1;
    572     if (x1 + (u_int64_t)x * bpb.nft > bpb.bsec)
    573 	errx(1, "meta data exceeds file system size");
    574     x1 += x * bpb.nft;
    575     x = (u_int64_t)(bpb.bsec - x1) * bpb.bps * NPB /
    576 	(bpb.spc * bpb.bps * NPB + fat / BPN * bpb.nft);
    577     x2 = howmany((RESFTE + MIN(x, maxcls(fat))) * (fat / BPN),
    578 		 bpb.bps * NPB);
    579     if (!bpb.bspf) {
    580 	bpb.bspf = x2;
    581 	x1 += (bpb.bspf - 1) * bpb.nft;
    582     }
    583     cls = (bpb.bsec - x1) / bpb.spc;
    584     x = (u_int64_t)bpb.bspf * bpb.bps * NPB / (fat / BPN) - RESFTE;
    585     if (cls > x)
    586 	cls = x;
    587     if (bpb.bspf < x2)
    588 	warnx("warning: sectors/FAT limits file system to %u clusters",
    589 	      cls);
    590     if (cls < mincls(fat))
    591 	errx(1, "%u clusters too few clusters for FAT%u, need %u", cls, fat,
    592 	    mincls(fat));
    593     if (cls > maxcls(fat)) {
    594 	cls = maxcls(fat);
    595 	bpb.bsec = x1 + (cls + 1) * bpb.spc - 1;
    596 	warnx("warning: FAT type limits file system to %u sectors",
    597 	      bpb.bsec);
    598     }
    599     printf("%s: %u sector%s in %u FAT%u cluster%s "
    600 	   "(%u bytes/cluster)\n", fname, cls * bpb.spc,
    601 	   cls * bpb.spc == 1 ? "" : "s", cls, fat,
    602 	   cls == 1 ? "" : "s", bpb.bps * bpb.spc);
    603     if (!bpb.mid)
    604 	bpb.mid = !bpb.hid ? 0xf0 : 0xf8;
    605     if (fat == 32)
    606 	bpb.rdcl = RESFTE;
    607     if (bpb.hid + bpb.bsec <= MAXU16) {
    608 	bpb.sec = bpb.bsec;
    609 	bpb.bsec = 0;
    610     }
    611     if (fat != 32) {
    612 	bpb.spf = bpb.bspf;
    613 	bpb.bspf = 0;
    614     }
    615     print_bpb(&bpb);
    616     if (!opt_N) {
    617 	gettimeofday(&tv, NULL);
    618 	now = tv.tv_sec;
    619 	tm = localtime(&now);
    620 	if (!(img = malloc(bpb.bps)))
    621 	    err(1, NULL);
    622 	dir = bpb.res + (bpb.spf ? bpb.spf : bpb.bspf) * bpb.nft;
    623 	for (lsn = 0; lsn < dir + (fat == 32 ? bpb.spc : rds); lsn++) {
    624 	    x = lsn;
    625 	    if (opt_B &&
    626 		fat == 32 && bpb.bkbs != MAXU16 &&
    627 		bss <= bpb.bkbs && x >= bpb.bkbs) {
    628 		x -= bpb.bkbs;
    629 		if (!x && lseek(fd1, opt_ofs, SEEK_SET))
    630 		    err(1, "%s", bname);
    631 	    }
    632 	    if (opt_B && x < bss) {
    633 		if ((n = read(fd1, img, bpb.bps)) == -1)
    634 		    err(1, "%s", bname);
    635 		if ((unsigned)n != bpb.bps)
    636 		    errx(1, "%s: can't read sector %u", bname, x);
    637 	    } else
    638 		memset(img, 0, bpb.bps);
    639 	    if (!lsn ||
    640 	      (fat == 32 && bpb.bkbs != MAXU16 && lsn == bpb.bkbs)) {
    641 		x1 = sizeof(struct bs);
    642 		bsbpb = (struct bsbpb *)(img + x1);
    643 		mk2(bsbpb->bps, bpb.bps);
    644 		mk1(bsbpb->spc, bpb.spc);
    645 		mk2(bsbpb->res, bpb.res);
    646 		mk1(bsbpb->nft, bpb.nft);
    647 		mk2(bsbpb->rde, bpb.rde);
    648 		mk2(bsbpb->sec, bpb.sec);
    649 		mk1(bsbpb->mid, bpb.mid);
    650 		mk2(bsbpb->spf, bpb.spf);
    651 		mk2(bsbpb->spt, bpb.spt);
    652 		mk2(bsbpb->hds, bpb.hds);
    653 		mk4(bsbpb->hid, bpb.hid);
    654 		mk4(bsbpb->bsec, bpb.bsec);
    655 		x1 += sizeof(struct bsbpb);
    656 		if (fat == 32) {
    657 		    bsxbpb = (struct bsxbpb *)(img + x1);
    658 		    mk4(bsxbpb->bspf, bpb.bspf);
    659 		    mk2(bsxbpb->xflg, 0);
    660 		    mk2(bsxbpb->vers, 0);
    661 		    mk4(bsxbpb->rdcl, bpb.rdcl);
    662 		    mk2(bsxbpb->infs, bpb.infs);
    663 		    mk2(bsxbpb->bkbs, bpb.bkbs);
    664 		    x1 += sizeof(struct bsxbpb);
    665 		}
    666 		bsx = (struct bsx *)(img + x1);
    667 		mk1(bsx->sig, 0x29);
    668 		if (Iflag)
    669 		    x = opt_I;
    670 		else
    671 		    x = (((u_int)(1 + tm->tm_mon) << 8 |
    672 			  (u_int)tm->tm_mday) +
    673 			 ((u_int)tm->tm_sec << 8 |
    674 			  (u_int)(tv.tv_usec / 10))) << 16 |
    675 			((u_int)(1900 + tm->tm_year) +
    676 			 ((u_int)tm->tm_hour << 8 |
    677 			  (u_int)tm->tm_min));
    678 		mk4(bsx->volid, x);
    679 		mklabel(bsx->label, opt_L ? opt_L : "NO NAME");
    680 		sprintf(buf, "FAT%u", fat);
    681 		setstr(bsx->type, buf, sizeof(bsx->type));
    682 		if (!opt_B) {
    683 		    x1 += sizeof(struct bsx);
    684 		    bs = (struct bs *)img;
    685 		    mk1(bs->jmp[0], 0xeb);
    686 		    mk1(bs->jmp[1], x1 - 2);
    687 		    mk1(bs->jmp[2], 0x90);
    688 		    setstr(bs->oem, opt_O ? opt_O : "BSD  4.4",
    689 			   sizeof(bs->oem));
    690 		    memcpy(img + x1, bootcode, sizeof(bootcode));
    691 		    mk2(img + MINBPS - 2, DOSMAGIC);
    692 		}
    693 	    } else if (fat == 32 && bpb.infs != MAXU16 &&
    694 		       (lsn == bpb.infs ||
    695 			(bpb.bkbs != MAXU16 &&
    696 			 lsn == bpb.bkbs + bpb.infs))) {
    697 		mk4(img, 0x41615252);
    698 		mk4(img + MINBPS - 28, 0x61417272);
    699 		mk4(img + MINBPS - 24, 0xffffffff);
    700 		mk4(img + MINBPS - 20, bpb.rdcl);
    701 		mk2(img + MINBPS - 2, DOSMAGIC);
    702 	    } else if (lsn >= bpb.res && lsn < dir &&
    703 		       !((lsn - bpb.res) %
    704 			 (bpb.spf ? bpb.spf : bpb.bspf))) {
    705 		mk1(img[0], bpb.mid);
    706 		for (x = 1; x < fat * (fat == 32 ? 3 : 2) / 8; x++)
    707 		    mk1(img[x], fat == 32 && x % 4 == 3 ? 0x0f : 0xff);
    708 	    } else if (lsn == dir && opt_L) {
    709 		de = (struct de *)img;
    710 		mklabel(de->namext, opt_L);
    711 		mk1(de->attr, 050);
    712 		x = (u_int)tm->tm_hour << 11 |
    713 		    (u_int)tm->tm_min << 5 |
    714 		    (u_int)tm->tm_sec >> 1;
    715 		mk2(de->time, x);
    716 		x = (u_int)(tm->tm_year - 80) << 9 |
    717 		    (u_int)(tm->tm_mon + 1) << 5 |
    718 		    (u_int)tm->tm_mday;
    719 		mk2(de->date, x);
    720 	    }
    721 	    if ((n = write(fd, img, bpb.bps)) == -1)
    722 		err(1, "%s", fname);
    723 	    if ((unsigned)n != bpb.bps) {
    724 		errx(1, "%s: can't write sector %u", fname, lsn);
    725                 exit(1);
    726             }
    727 	}
    728     }
    729     return 0;
    730 }
    731 
    732 /*
    733  * Exit with error if file system is mounted.
    734  */
    735 static void
    736 check_mounted(const char *fname, mode_t mode)
    737 {
    738     struct statfs *mp;
    739     const char *s1, *s2;
    740     size_t len;
    741     int n, r;
    742 
    743 #ifdef ANDROID
    744     warnx("Skipping mount checks");
    745 #else
    746     if (!(n = getmntinfo(&mp, MNT_NOWAIT)))
    747 	err(1, "getmntinfo");
    748     len = strlen(_PATH_DEV);
    749     s1 = fname;
    750     if (!strncmp(s1, _PATH_DEV, len))
    751 	s1 += len;
    752     r = S_ISCHR(mode) && s1 != fname && *s1 == 'r';
    753     for (; n--; mp++) {
    754 	s2 = mp->f_mntfromname;
    755 	if (!strncmp(s2, _PATH_DEV, len))
    756 	    s2 += len;
    757 	if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) ||
    758 	    !strcmp(s1, s2))
    759 	    errx(1, "%s is mounted on %s", fname, mp->f_mntonname);
    760     }
    761 #endif
    762 }
    763 
    764 /*
    765  * Get a standard format.
    766  */
    767 static void
    768 getstdfmt(const char *fmt, struct bpb *bpb)
    769 {
    770     u_int x, i;
    771 
    772     x = sizeof(stdfmt) / sizeof(stdfmt[0]);
    773     for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++);
    774     if (i == x)
    775 	errx(1, "%s: unknown standard format", fmt);
    776     *bpb = stdfmt[i].bpb;
    777 }
    778 
    779 /*
    780  * Get disk slice, partition, and geometry information.
    781  */
    782 
    783 #ifdef ANDROID
    784 static void
    785 getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag,
    786 	    struct bpb *bpb)
    787 {
    788     struct hd_geometry geom;
    789 
    790     if (ioctl(fd, BLKSSZGET, &bpb->bps)) {
    791         fprintf(stderr, "Error getting bytes / sector (%s)\n", strerror(errno));
    792         exit(1);
    793     }
    794 
    795     ckgeom(fname, bpb->bps, "bytes/sector");
    796 
    797     if (ioctl(fd, BLKGETSIZE, &bpb->bsec)) {
    798         fprintf(stderr, "Error getting blocksize (%s)\n", strerror(errno));
    799         exit(1);
    800     }
    801 
    802     if (ioctl(fd, HDIO_GETGEO, &geom)) {
    803         fprintf(stderr, "Error getting gemoetry (%s) - trying sane values\n", strerror(errno));
    804         geom.heads = 64;
    805         geom.sectors = 63;
    806     }
    807 
    808     if (!geom.heads) {
    809         printf("Bogus heads from kernel - setting sane value\n");
    810         geom.heads = 64;
    811     }
    812 
    813     if (!geom.sectors) {
    814         printf("Bogus sectors from kernel - setting sane value\n");
    815         geom.sectors = 63;
    816     }
    817 
    818     bpb->spt = geom.sectors;
    819     ckgeom(fname, bpb->spt, "sectors/track");
    820 
    821     bpb->hds = geom.heads;
    822     ckgeom(fname, bpb->hds, "drive heads");
    823 }
    824 
    825 #else
    826 
    827 static void
    828 getdiskinfo(int fd, const char *fname, const char *dtype, __unused int oflag,
    829 	    struct bpb *bpb)
    830 {
    831     struct disklabel *lp, dlp;
    832     struct fd_type type;
    833     off_t ms, hs = 0;
    834 
    835     lp = NULL;
    836 
    837     /* If the user specified a disk type, try to use that */
    838     if (dtype != NULL) {
    839 	lp = getdiskbyname(dtype);
    840     }
    841 
    842     /* Maybe it's a floppy drive */
    843     if (lp == NULL) {
    844 	if (ioctl(fd, DIOCGMEDIASIZE, &ms) == -1) {
    845 	    struct stat st;
    846 
    847 	    if (fstat(fd, &st))
    848 		err(1, "Cannot get disk size");
    849 	    /* create a fake geometry for a file image */
    850 	    ms = st.st_size;
    851 	    dlp.d_secsize = 512;
    852 	    dlp.d_nsectors = 63;
    853 	    dlp.d_ntracks = 255;
    854 	    dlp.d_secperunit = ms / dlp.d_secsize;
    855 	    lp = &dlp;
    856 	} else if (ioctl(fd, FD_GTYPE, &type) != -1) {
    857 	    dlp.d_secsize = 128 << type.secsize;
    858 	    dlp.d_nsectors = type.sectrac;
    859 	    dlp.d_ntracks = type.heads;
    860 	    dlp.d_secperunit = ms / dlp.d_secsize;
    861 	    lp = &dlp;
    862 	}
    863     }
    864 
    865     /* Maybe it's a fixed drive */
    866     if (lp == NULL) {
    867 	if (ioctl(fd, DIOCGDINFO, &dlp) == -1) {
    868 	    if (bpb->bps == 0 && ioctl(fd, DIOCGSECTORSIZE, &dlp.d_secsize) == -1)
    869 		errx(1, "Cannot get sector size, %s", strerror(errno));
    870 
    871 	    /* XXX Should we use bpb->bps if it's set? */
    872 	    dlp.d_secperunit = ms / dlp.d_secsize;
    873 
    874 	    if (bpb->spt == 0 && ioctl(fd, DIOCGFWSECTORS, &dlp.d_nsectors) == -1) {
    875 		warnx("Cannot get number of sectors per track, %s", strerror(errno));
    876 		dlp.d_nsectors = 63;
    877 	    }
    878 	    if (bpb->hds == 0 && ioctl(fd, DIOCGFWHEADS, &dlp.d_ntracks) == -1) {
    879 		warnx("Cannot get number of heads, %s", strerror(errno));
    880 		if (dlp.d_secperunit <= 63*1*1024)
    881 		    dlp.d_ntracks = 1;
    882 		else if (dlp.d_secperunit <= 63*16*1024)
    883 		    dlp.d_ntracks = 16;
    884 		else
    885 		    dlp.d_ntracks = 255;
    886 	    }
    887 	}
    888 
    889 	hs = (ms / dlp.d_secsize) - dlp.d_secperunit;
    890 	lp = &dlp;
    891     }
    892 
    893     if (bpb->bps == 0)
    894 	bpb->bps = ckgeom(fname, lp->d_secsize, "bytes/sector");
    895     if (bpb->spt == 0)
    896 	bpb->spt = ckgeom(fname, lp->d_nsectors, "sectors/track");
    897     if (bpb->hds == 0)
    898 	bpb->hds = ckgeom(fname, lp->d_ntracks, "drive heads");
    899     if (bpb->bsec == 0)
    900 	bpb->bsec = lp->d_secperunit;
    901     if (bpb->hid == 0)
    902 	bpb->hid = hs;
    903 }
    904 #endif
    905 
    906 /*
    907  * Print out BPB values.
    908  */
    909 static void
    910 print_bpb(struct bpb *bpb)
    911 {
    912     printf("bps=%u spc=%u res=%u nft=%u", bpb->bps, bpb->spc, bpb->res,
    913 	   bpb->nft);
    914     if (bpb->rde)
    915 	printf(" rde=%u", bpb->rde);
    916     if (bpb->sec)
    917 	printf(" sec=%u", bpb->sec);
    918     printf(" mid=%#x", bpb->mid);
    919     if (bpb->spf)
    920 	printf(" spf=%u", bpb->spf);
    921     printf(" spt=%u hds=%u hid=%u", bpb->spt, bpb->hds, bpb->hid);
    922     if (bpb->bsec)
    923 	printf(" bsec=%u", bpb->bsec);
    924     if (!bpb->spf) {
    925 	printf(" bspf=%u rdcl=%u", bpb->bspf, bpb->rdcl);
    926 	printf(" infs=");
    927 	printf(bpb->infs == MAXU16 ? "%#x" : "%u", bpb->infs);
    928 	printf(" bkbs=");
    929 	printf(bpb->bkbs == MAXU16 ? "%#x" : "%u", bpb->bkbs);
    930     }
    931     printf("\n");
    932 }
    933 
    934 /*
    935  * Check a disk geometry value.
    936  */
    937 static u_int
    938 ckgeom(const char *fname, u_int val, const char *msg)
    939 {
    940     if (!val)
    941 	errx(1, "%s: no default %s", fname, msg);
    942     if (val > MAXU16)
    943 	errx(1, "%s: illegal %s %d", fname, msg, val);
    944     return val;
    945 }
    946 
    947 /*
    948  * Convert and check a numeric option argument.
    949  */
    950 static u_int
    951 argtou(const char *arg, u_int lo, u_int hi, const char *msg)
    952 {
    953     char *s;
    954     u_long x;
    955 
    956     errno = 0;
    957     x = strtoul(arg, &s, 0);
    958     if (errno || !*arg || *s || x < lo || x > hi)
    959 	errx(1, "%s: bad %s", arg, msg);
    960     return x;
    961 }
    962 
    963 /*
    964  * Same for off_t, with optional skmgpP suffix
    965  */
    966 static off_t
    967 argtooff(const char *arg, const char *msg)
    968 {
    969     char *s;
    970     off_t x;
    971 
    972     x = strtoll(arg, &s, 0);
    973     /* allow at most one extra char */
    974     if (errno || x < 0 || (s[0] && s[1]) )
    975 	errx(1, "%s: bad %s", arg, msg);
    976     if (*s) {	/* the extra char is the multiplier */
    977 	switch (*s) {
    978 	default:
    979 	    errx(1, "%s: bad %s", arg, msg);
    980 	    /* notreached */
    981 
    982 	case 's':	/* sector */
    983 	case 'S':
    984 	    x <<= 9;	/* times 512 */
    985 	    break;
    986 
    987 	case 'k':	/* kilobyte */
    988 	case 'K':
    989 	    x <<= 10;	/* times 1024 */
    990 	    break;
    991 
    992 	case 'm':	/* megabyte */
    993 	case 'M':
    994 	    x <<= 20;	/* times 1024*1024 */
    995 	    break;
    996 
    997 	case 'g':	/* gigabyte */
    998 	case 'G':
    999 	    x <<= 30;	/* times 1024*1024*1024 */
   1000 	    break;
   1001 
   1002 	case 'p':	/* partition start */
   1003 	case 'P':	/* partition start */
   1004 	case 'l':	/* partition length */
   1005 	case 'L':	/* partition length */
   1006 	    errx(1, "%s: not supported yet %s", arg, msg);
   1007 	    /* notreached */
   1008 	}
   1009     }
   1010     return x;
   1011 }
   1012 
   1013 /*
   1014  * Check a volume label.
   1015  */
   1016 static int
   1017 oklabel(const char *src)
   1018 {
   1019     int c, i;
   1020 
   1021     for (i = 0; i <= 11; i++) {
   1022 	c = (u_char)*src++;
   1023 	if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c))
   1024 	    break;
   1025     }
   1026     return i && !c;
   1027 }
   1028 
   1029 /*
   1030  * Make a volume label.
   1031  */
   1032 static void
   1033 mklabel(u_int8_t *dest, const char *src)
   1034 {
   1035     int c, i;
   1036 
   1037     for (i = 0; i < 11; i++) {
   1038 	c = *src ? toupper(*src++) : ' ';
   1039 	*dest++ = !i && c == '\xe5' ? 5 : c;
   1040     }
   1041 }
   1042 
   1043 /*
   1044  * Copy string, padding with spaces.
   1045  */
   1046 static void
   1047 setstr(u_int8_t *dest, const char *src, size_t len)
   1048 {
   1049     while (len--)
   1050 	*dest++ = *src ? *src++ : ' ';
   1051 }
   1052 
   1053 /*
   1054  * Print usage message.
   1055  */
   1056 static void
   1057 usage(void)
   1058 {
   1059 	fprintf(stderr,
   1060 	    "usage: newfs_msdos [ -options ] special [disktype]\n"
   1061 	    "where the options are:\n"
   1062 	    "\t-@ create file system at specified offset\n"
   1063 	    "\t-B get bootstrap from file\n"
   1064 	    "\t-C create image file with specified size\n"
   1065 	    "\t-F FAT type (12, 16, or 32)\n"
   1066 	    "\t-I volume ID\n"
   1067 	    "\t-L volume label\n"
   1068 	    "\t-N don't create file system: just print out parameters\n"
   1069 	    "\t-O OEM string\n"
   1070 	    "\t-S bytes/sector\n"
   1071 	    "\t-a sectors/FAT\n"
   1072 	    "\t-b block size\n"
   1073 	    "\t-c sectors/cluster\n"
   1074 	    "\t-e root directory entries\n"
   1075 	    "\t-f standard format\n"
   1076 	    "\t-h drive heads\n"
   1077 	    "\t-i file system info sector\n"
   1078 	    "\t-k backup boot sector\n"
   1079 	    "\t-m media descriptor\n"
   1080 	    "\t-n number of FATs\n"
   1081 	    "\t-o hidden sectors\n"
   1082 	    "\t-r reserved sectors\n"
   1083 	    "\t-s file system size (sectors)\n"
   1084 	    "\t-u sectors/track\n");
   1085 	exit(1);
   1086 }
   1087