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NetBSD/sbin/newfs_msdos/mkfs_msdos.c
martin 88bc910896 PR bin/46743: mark the "next free cluster" value in the file system 
info block as unitialized.
2014-01-05 12:52:39 +00:00

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/* $NetBSD: mkfs_msdos.c,v 1.9 2014/01/05 12:52:39 martin Exp $ */
/*
* Copyright (c) 1998 Robert Nordier
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#ifndef lint
#if 0
static const char rcsid[] =
"$FreeBSD: src/sbin/newfs_msdos/newfs_msdos.c,v 1.15 2000/10/10 01:49:37 wollman Exp $";
#else
__RCSID("$NetBSD: mkfs_msdos.c,v 1.9 2014/01/05 12:52:39 martin Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#ifndef MAKEFS
#include <sys/mount.h>
#include <sys/disk.h>
#endif
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>
#include <util.h>
#include <disktab.h>
#ifndef MAKEFS
#include "partutil.h"
#endif
#include "mkfs_msdos.h"
#define MAXU16 0xffff /* maximum unsigned 16-bit quantity */
#define BPN 4 /* bits per nibble */
#define NPB 2 /* nibbles per byte */
#define DOSMAGIC 0xaa55 /* DOS magic number */
#define MINBPS 512 /* minimum bytes per sector */
#define MAXSPC 128 /* maximum sectors per cluster */
#define MAXNFT 16 /* maximum number of FATs */
#define DEFBLK 4096 /* default block size */
#define DEFBLK16 2048 /* default block size FAT16 */
#define DEFRDE 512 /* default root directory entries */
#define RESFTE 2 /* reserved FAT entries */
#define MINCLS12 1 /* minimum FAT12 clusters */
#define MINCLS16 0xff5 /* minimum FAT16 clusters */
#define MINCLS32 0xfff5 /* minimum FAT32 clusters */
#define MAXCLS12 0xff4 /* maximum FAT12 clusters */
#define MAXCLS16 0xfff4 /* maximum FAT16 clusters */
#define MAXCLS32 0xffffff4 /* maximum FAT32 clusters */
#define mincls(fat_type) ((fat_type) == 12 ? MINCLS12 : \
(fat_type) == 16 ? MINCLS16 : \
MINCLS32)
#define maxcls(fat_type) ((fat_type) == 12 ? MAXCLS12 : \
(fat_type) == 16 ? MAXCLS16 : \
MAXCLS32)
#define mk1(p, x) \
(p) = (u_int8_t)(x)
#define mk2(p, x) \
(p)[0] = (u_int8_t)(x), \
(p)[1] = (u_int8_t)((x) >> 010)
#define mk4(p, x) \
(p)[0] = (u_int8_t)(x), \
(p)[1] = (u_int8_t)((x) >> 010), \
(p)[2] = (u_int8_t)((x) >> 020), \
(p)[3] = (u_int8_t)((x) >> 030)
struct bs {
u_int8_t jmp[3]; /* bootstrap entry point */
u_int8_t oem[8]; /* OEM name and version */
};
struct bsbpb {
u_int8_t bps[2]; /* bytes per sector */
u_int8_t spc; /* sectors per cluster */
u_int8_t res[2]; /* reserved sectors */
u_int8_t nft; /* number of FATs */
u_int8_t rde[2]; /* root directory entries */
u_int8_t sec[2]; /* total sectors */
u_int8_t mid; /* media descriptor */
u_int8_t spf[2]; /* sectors per FAT */
u_int8_t spt[2]; /* sectors per track */
u_int8_t hds[2]; /* drive heads */
u_int8_t hid[4]; /* hidden sectors */
u_int8_t bsec[4]; /* big total sectors */
};
struct bsxbpb {
u_int8_t bspf[4]; /* big sectors per FAT */
u_int8_t xflg[2]; /* FAT control flags */
u_int8_t vers[2]; /* file system version */
u_int8_t rdcl[4]; /* root directory start cluster */
u_int8_t infs[2]; /* file system info sector */
u_int8_t bkbs[2]; /* backup boot sector */
u_int8_t rsvd[12]; /* reserved */
};
struct bsx {
u_int8_t drv; /* drive number */
u_int8_t rsvd; /* reserved */
u_int8_t sig; /* extended boot signature */
u_int8_t volid[4]; /* volume ID number */
u_int8_t label[11]; /* volume label */
u_int8_t type[8]; /* file system type */
};
struct de {
u_int8_t namext[11]; /* name and extension */
u_int8_t attr; /* attributes */
u_int8_t rsvd[10]; /* reserved */
u_int8_t time[2]; /* creation time */
u_int8_t date[2]; /* creation date */
u_int8_t clus[2]; /* starting cluster */
u_int8_t size[4]; /* size */
};
struct bpb {
u_int bps; /* bytes per sector */
u_int spc; /* sectors per cluster */
u_int res; /* reserved sectors */
u_int nft; /* number of FATs */
u_int rde; /* root directory entries */
u_int sec; /* total sectors */
u_int mid; /* media descriptor */
u_int spf; /* sectors per FAT */
u_int spt; /* sectors per track */
u_int hds; /* drive heads */
u_int hid; /* hidden sectors */
u_int bsec; /* big total sectors */
u_int bspf; /* big sectors per FAT */
u_int rdcl; /* root directory start cluster */
u_int infs; /* file system info sector */
u_int bkbs; /* backup boot sector */
};
#define INIT(a, b, c, d, e, f, g, h, i, j) \
{ .bps = a, .spc = b, .res = c, .nft = d, .rde = e, \
.sec = f, .mid = g, .spf = h, .spt = i, .hds = j, }
static struct {
const char *name;
struct bpb bpb;
} stdfmt[] = {
{"160", INIT(512, 1, 1, 2, 64, 320, 0xfe, 1, 8, 1)},
{"180", INIT(512, 1, 1, 2, 64, 360, 0xfc, 2, 9, 1)},
{"320", INIT(512, 2, 1, 2, 112, 640, 0xff, 1, 8, 2)},
{"360", INIT(512, 2, 1, 2, 112, 720, 0xfd, 2, 9, 2)},
{"640", INIT(512, 2, 1, 2, 112, 1280, 0xfb, 2, 8, 2)},
{"720", INIT(512, 2, 1, 2, 112, 1440, 0xf9, 3, 9, 2)},
{"1200", INIT(512, 1, 1, 2, 224, 2400, 0xf9, 7, 15, 2)},
{"1232", INIT(1024,1, 1, 2, 192, 1232, 0xfe, 2, 8, 2)},
{"1440", INIT(512, 1, 1, 2, 224, 2880, 0xf0, 9, 18, 2)},
{"2880", INIT(512, 2, 1, 2, 240, 5760, 0xf0, 9, 36, 2)}
};
static u_int8_t bootcode[] = {
0xfa, /* cli */
0x31, 0xc0, /* xor ax,ax */
0x8e, 0xd0, /* mov ss,ax */
0xbc, 0x00, 0x7c, /* mov sp,7c00h */
0xfb, /* sti */
0x8e, 0xd8, /* mov ds,ax */
0xe8, 0x00, 0x00, /* call $ + 3 */
0x5e, /* pop si */
0x83, 0xc6, 0x19, /* add si,+19h */
0xbb, 0x07, 0x00, /* mov bx,0007h */
0xfc, /* cld */
0xac, /* lodsb */
0x84, 0xc0, /* test al,al */
0x74, 0x06, /* jz $ + 8 */
0xb4, 0x0e, /* mov ah,0eh */
0xcd, 0x10, /* int 10h */
0xeb, 0xf5, /* jmp $ - 9 */
0x30, 0xe4, /* xor ah,ah */
0xcd, 0x16, /* int 16h */
0xcd, 0x19, /* int 19h */
0x0d, 0x0a,
'N', 'o', 'n', '-', 's', 'y', 's', 't',
'e', 'm', ' ', 'd', 'i', 's', 'k',
0x0d, 0x0a,
'P', 'r', 'e', 's', 's', ' ', 'a', 'n',
'y', ' ', 'k', 'e', 'y', ' ', 't', 'o',
' ', 'r', 'e', 'b', 'o', 'o', 't',
0x0d, 0x0a,
0
};
static int got_siginfo = 0; /* received a SIGINFO */
#ifndef MAKEFS
static int check_mounted(const char *, mode_t);
#endif
static int getstdfmt(const char *, struct bpb *);
static int getbpbinfo(int, const char *, const char *, int, struct bpb *, int);
static void print_bpb(struct bpb *);
static int ckgeom(const char *, u_int, const char *);
static int oklabel(const char *);
static void mklabel(u_int8_t *, const char *);
static void setstr(u_int8_t *, const char *, size_t);
static void infohandler(int sig);
int
mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
{
char buf[MAXPATHLEN];
struct stat sb;
struct timeval tv;
struct bpb bpb;
struct tm *tm;
struct bs *bs;
struct bsbpb *bsbpb;
struct bsxbpb *bsxbpb;
struct bsx *bsx;
struct de *de;
u_int8_t *img;
const char *bname;
ssize_t n;
time_t now;
u_int bss, rds, cls, dir, lsn, x, x1, x2;
int ch, fd, fd1;
struct msdos_options o = *op;
int oflags = O_RDWR | O_CREAT;
if (o.block_size && o.sectors_per_cluster) {
warnx("Cannot specify both block size and sectors per cluster");
return -1;
}
if (o.OEM_string && strlen(o.OEM_string) > 8) {
warnx("%s: bad OEM string", o.OEM_string);
return -1;
}
if (o.create_size) {
if (o.no_create) {
warnx("create (-C) is incompatible with -N");
return -1;
}
if (o.offset == 0)
oflags |= O_TRUNC;
fd = open(fname, oflags, 0644);
if (fd == -1) {
warnx("failed to create %s", fname);
return -1;
}
(void)lseek(fd, o.create_size - 1, SEEK_SET);
if (write(fd, "\0", 1) != 1) {
warn("failed to set file size");
return -1;
}
(void)lseek(fd, 0, SEEK_SET);
} else if ((fd = open(fname, o.no_create ? O_RDONLY : O_RDWR)) == -1 ||
fstat(fd, &sb)) {
warn("%s", fname);
return -1;
}
#ifndef MAKEFS
if (!o.no_create)
if (check_mounted(fname, sb.st_mode) == -1)
return -1;
#endif
if (!S_ISCHR(sb.st_mode) && !o.create_size) {
warnx("warning, %s is not a character device", fname);
return -1;
}
if (o.offset && o.offset != lseek(fd, o.offset, SEEK_SET)) {
warnx("cannot seek to %jd", (intmax_t)o.offset);
return -1;
}
memset(&bpb, 0, sizeof(bpb));
if (o.floppy) {
if (getstdfmt(o.floppy, &bpb) == -1)
return -1;
bpb.bsec = bpb.sec;
bpb.sec = 0;
bpb.bspf = bpb.spf;
bpb.spf = 0;
}
if (o.drive_heads)
bpb.hds = o.drive_heads;
if (o.sectors_per_track)
bpb.spt = o.sectors_per_track;
if (o.bytes_per_sector)
bpb.bps = o.bytes_per_sector;
if (o.size)
bpb.bsec = o.size;
if (o.hidden_sectors_set)
bpb.hid = o.hidden_sectors;
if (!(o.floppy || (o.drive_heads && o.sectors_per_track &&
o.bytes_per_sector && o.size && o.hidden_sectors_set))) {
if (getbpbinfo(fd, fname, dtype, o.hidden_sectors_set, &bpb,
o.create_size != 0) == -1)
return -1;
bpb.bsec -= (o.offset / bpb.bps);
if (bpb.spc == 0) { /* set defaults */
if (bpb.bsec <= 6000) /* about 3MB -> 512 bytes */
bpb.spc = 1;
else if (bpb.bsec <= (1<<17)) /* 64M -> 4k */
bpb.spc = 8;
else if (bpb.bsec <= (1<<19)) /* 256M -> 8k */
bpb.spc = 16;
else if (bpb.bsec <= (1<<21)) /* 1G -> 16k */
bpb.spc = 32;
else
bpb.spc = 64; /* otherwise 32k */
}
}
if (o.volume_label && !oklabel(o.volume_label)) {
warnx("%s: bad volume label", o.volume_label);
return -1;
}
switch (o.fat_type) {
case 0:
if (o.floppy)
o.fat_type = 12;
else if (!o.directory_entries && (o.info_sector || o.backup_sector))
o.fat_type = 32;
break;
case 12:
case 16:
if (o.info_sector) {
warnx("Cannot specify info sector with FAT%u", o.fat_type);
return -1;
}
if (o.backup_sector) {
warnx("Cannot specify backup sector with FAT%u", o.fat_type);
return -1;
}
break;
case 32:
if (o.directory_entries) {
warnx("Cannot specify directory entries with FAT32");
return -1;
}
break;
default:
warnx("%d: bad FAT type", o.fat_type);
return -1;
}
if (!powerof2(bpb.bps)) {
warnx("bytes/sector (%u) is not a power of 2", bpb.bps);
return -1;
}
if (bpb.bps < MINBPS) {
warnx("bytes/sector (%u) is too small; minimum is %u",
bpb.bps, MINBPS);
return -1;
}
if (o.floppy && o.fat_type == 32)
bpb.rde = 0;
if (o.block_size) {
if (!powerof2(o.block_size)) {
warnx("block size (%u) is not a power of 2", o.block_size);
return -1;
}
if (o.block_size < bpb.bps) {
warnx("block size (%u) is too small; minimum is %u",
o.block_size, bpb.bps);
return -1;
}
if (o.block_size > bpb.bps * MAXSPC) {
warnx("block size (%u) is too large; maximum is %u",
o.block_size, bpb.bps * MAXSPC);
return -1;
}
bpb.spc = o.block_size / bpb.bps;
}
if (o.sectors_per_cluster) {
if (!powerof2(o.sectors_per_cluster)) {
warnx("sectors/cluster (%u) is not a power of 2",
o.sectors_per_cluster);
return -1;
}
bpb.spc = o.sectors_per_cluster;
}
if (o.reserved_sectors)
bpb.res = o.reserved_sectors;
if (o.num_FAT) {
if (o.num_FAT > MAXNFT) {
warnx("number of FATs (%u) is too large; maximum is %u",
o.num_FAT, MAXNFT);
return -1;
}
bpb.nft = o.num_FAT;
}
if (o.directory_entries)
bpb.rde = o.directory_entries;
if (o.media_descriptor_set) {
if (o.media_descriptor < 0xf0) {
warnx("illegal media descriptor (%#x)", o.media_descriptor);
return -1;
}
bpb.mid = o.media_descriptor;
}
if (o.sectors_per_fat)
bpb.bspf = o.sectors_per_fat;
if (o.info_sector)
bpb.infs = o.info_sector;
if (o.backup_sector)
bpb.bkbs = o.backup_sector;
bss = 1;
bname = NULL;
fd1 = -1;
if (o.bootstrap) {
bname = o.bootstrap;
if (!strchr(bname, '/')) {
snprintf(buf, sizeof(buf), "/boot/%s", bname);
if (!(bname = strdup(buf))) {
warn(NULL);
return -1;
}
}
if ((fd1 = open(bname, O_RDONLY)) == -1 || fstat(fd1, &sb)) {
warn("%s", bname);
return -1;
}
if (!S_ISREG(sb.st_mode) || sb.st_size % bpb.bps ||
sb.st_size < bpb.bps || sb.st_size > bpb.bps * MAXU16) {
warnx("%s: inappropriate file type or format", bname);
return -1;
}
bss = sb.st_size / bpb.bps;
}
if (!bpb.nft)
bpb.nft = 2;
if (!o.fat_type) {
if (bpb.bsec < (bpb.res ? bpb.res : bss) +
howmany((RESFTE + (bpb.spc ? MINCLS16 : MAXCLS12 + 1)) *
((bpb.spc ? 16 : 12) / BPN), bpb.bps * NPB) *
bpb.nft +
howmany(bpb.rde ? bpb.rde : DEFRDE,
bpb.bps / sizeof(struct de)) +
(bpb.spc ? MINCLS16 : MAXCLS12 + 1) *
(bpb.spc ? bpb.spc : howmany(DEFBLK, bpb.bps)))
o.fat_type = 12;
else if (bpb.rde || bpb.bsec <
(bpb.res ? bpb.res : bss) +
howmany((RESFTE + MAXCLS16) * 2, bpb.bps) * bpb.nft +
howmany(DEFRDE, bpb.bps / sizeof(struct de)) +
(MAXCLS16 + 1) *
(bpb.spc ? bpb.spc : howmany(8192, bpb.bps)))
o.fat_type = 16;
else
o.fat_type = 32;
}
x = bss;
if (o.fat_type == 32) {
if (!bpb.infs) {
if (x == MAXU16 || x == bpb.bkbs) {
warnx("no room for info sector");
return -1;
}
bpb.infs = x;
}
if (bpb.infs != MAXU16 && x <= bpb.infs)
x = bpb.infs + 1;
if (!bpb.bkbs) {
if (x == MAXU16) {
warnx("no room for backup sector");
return -1;
}
bpb.bkbs = x;
} else if (bpb.bkbs != MAXU16 && bpb.bkbs == bpb.infs) {
warnx("backup sector would overwrite info sector");
return -1;
}
if (bpb.bkbs != MAXU16 && x <= bpb.bkbs)
x = bpb.bkbs + 1;
}
if (!bpb.res)
bpb.res = o.fat_type == 32 ? MAX(x, MAX(16384 / bpb.bps, 4)) : x;
else if (bpb.res < x) {
warnx("too few reserved sectors (need %d have %d)", x, bpb.res);
return -1;
}
if (o.fat_type != 32 && !bpb.rde)
bpb.rde = DEFRDE;
rds = howmany(bpb.rde, bpb.bps / sizeof(struct de));
if (!bpb.spc)
for (bpb.spc = howmany(o.fat_type == 16 ? DEFBLK16 : DEFBLK, bpb.bps);
bpb.spc < MAXSPC &&
bpb.res +
howmany((RESFTE + maxcls(o.fat_type)) * (o.fat_type / BPN),
bpb.bps * NPB) * bpb.nft +
rds +
(u_int64_t)(maxcls(o.fat_type) + 1) * bpb.spc <= bpb.bsec;
bpb.spc <<= 1);
if (o.fat_type != 32 && bpb.bspf > MAXU16) {
warnx("too many sectors/FAT for FAT12/16");
return -1;
}
x1 = bpb.res + rds;
x = bpb.bspf ? bpb.bspf : 1;
if (x1 + (u_int64_t)x * bpb.nft > bpb.bsec) {
warnx("meta data exceeds file system size");
return -1;
}
x1 += x * bpb.nft;
x = (u_int64_t)(bpb.bsec - x1) * bpb.bps * NPB /
(bpb.spc * bpb.bps * NPB + o.fat_type / BPN * bpb.nft);
x2 = howmany((RESFTE + MIN(x, maxcls(o.fat_type))) * (o.fat_type / BPN),
bpb.bps * NPB);
if (!bpb.bspf) {
bpb.bspf = x2;
x1 += (bpb.bspf - 1) * bpb.nft;
}
cls = (bpb.bsec - x1) / bpb.spc;
x = (u_int64_t)bpb.bspf * bpb.bps * NPB / (o.fat_type / BPN) - RESFTE;
if (cls > x)
cls = x;
if (bpb.bspf < x2) {
warnx("warning: sectors/FAT limits file system to %u clusters",
cls);
return -1;
}
if (cls < mincls(o.fat_type)) {
warnx("%u clusters too few clusters for FAT%u, need %u", cls,
o.fat_type, mincls(o.fat_type));
return -1;
}
if (cls > maxcls(o.fat_type)) {
cls = maxcls(o.fat_type);
bpb.bsec = x1 + (cls + 1) * bpb.spc - 1;
warnx("warning: FAT type limits file system to %u sectors",
bpb.bsec);
return -1;
}
printf("%s: %u sector%s in %u FAT%u cluster%s "
"(%u bytes/cluster)\n", fname, cls * bpb.spc,
cls * bpb.spc == 1 ? "" : "s", cls, o.fat_type,
cls == 1 ? "" : "s", bpb.bps * bpb.spc);
if (!bpb.mid)
bpb.mid = !bpb.hid ? 0xf0 : 0xf8;
if (o.fat_type == 32)
bpb.rdcl = RESFTE;
if (bpb.hid + bpb.bsec <= MAXU16) {
bpb.sec = bpb.bsec;
bpb.bsec = 0;
}
if (o.fat_type != 32) {
bpb.spf = bpb.bspf;
bpb.bspf = 0;
}
ch = 0;
if (o.fat_type == 12)
ch = 1; /* 001 Primary DOS with 12 bit FAT */
else if (o.fat_type == 16) {
if (bpb.bsec == 0)
ch = 4; /* 004 Primary DOS with 16 bit FAT <32M */
else
ch = 6; /* 006 Primary 'big' DOS, 16-bit FAT (> 32MB) */
/*
* XXX: what about:
* 014 DOS (16-bit FAT) - LBA
* ?
*/
} else if (o.fat_type == 32) {
ch = 11; /* 011 Primary DOS with 32 bit FAT */
/*
* XXX: what about:
* 012 Primary DOS with 32 bit FAT - LBA
* ?
*/
}
if (ch != 0)
printf("MBR type: %d\n", ch);
print_bpb(&bpb);
if (!o.no_create) {
gettimeofday(&tv, NULL);
now = tv.tv_sec;
tm = localtime(&now);
if (!(img = malloc(bpb.bps)))
err(1, NULL);
dir = bpb.res + (bpb.spf ? bpb.spf : bpb.bspf) * bpb.nft;
#ifdef SIGINFO
signal(SIGINFO, infohandler);
#endif
for (lsn = 0; lsn < dir + (o.fat_type == 32 ? bpb.spc : rds); lsn++) {
if (got_siginfo) {
fprintf(stderr,"%s: writing sector %u of %u (%u%%)\n",
fname,lsn,(dir + (o.fat_type == 32 ? bpb.spc : rds)),
(lsn*100)/(dir + (o.fat_type == 32 ? bpb.spc : rds)));
got_siginfo = 0;
}
x = lsn;
if (o.bootstrap &&
o.fat_type == 32 && bpb.bkbs != MAXU16 &&
bss <= bpb.bkbs && x >= bpb.bkbs) {
x -= bpb.bkbs;
if (!x && lseek(fd1, o.offset, SEEK_SET)) {
warn("%s", bname);
return -1;
}
}
if (o.bootstrap && x < bss) {
if ((n = read(fd1, img, bpb.bps)) == -1) {
warn("%s", bname);
return -1;
}
if ((size_t)n != bpb.bps) {
warnx("%s: can't read sector %u", bname, x);
return -1;
}
} else
memset(img, 0, bpb.bps);
if (!lsn ||
(o.fat_type == 32 && bpb.bkbs != MAXU16 && lsn == bpb.bkbs)) {
x1 = sizeof(struct bs);
bsbpb = (struct bsbpb *)(img + x1);
mk2(bsbpb->bps, bpb.bps);
mk1(bsbpb->spc, bpb.spc);
mk2(bsbpb->res, bpb.res);
mk1(bsbpb->nft, bpb.nft);
mk2(bsbpb->rde, bpb.rde);
mk2(bsbpb->sec, bpb.sec);
mk1(bsbpb->mid, bpb.mid);
mk2(bsbpb->spf, bpb.spf);
mk2(bsbpb->spt, bpb.spt);
mk2(bsbpb->hds, bpb.hds);
mk4(bsbpb->hid, bpb.hid);
mk4(bsbpb->bsec, bpb.bsec);
x1 += sizeof(struct bsbpb);
if (o.fat_type == 32) {
bsxbpb = (struct bsxbpb *)(img + x1);
mk4(bsxbpb->bspf, bpb.bspf);
mk2(bsxbpb->xflg, 0);
mk2(bsxbpb->vers, 0);
mk4(bsxbpb->rdcl, bpb.rdcl);
mk2(bsxbpb->infs, bpb.infs);
mk2(bsxbpb->bkbs, bpb.bkbs);
x1 += sizeof(struct bsxbpb);
}
bsx = (struct bsx *)(img + x1);
mk1(bsx->sig, 0x29);
if (o.volume_id_set)
x = o.volume_id;
else
x = (((u_int)(1 + tm->tm_mon) << 8 |
(u_int)tm->tm_mday) +
((u_int)tm->tm_sec << 8 |
(u_int)(tv.tv_usec / 10))) << 16 |
((u_int)(1900 + tm->tm_year) +
((u_int)tm->tm_hour << 8 |
(u_int)tm->tm_min));
mk4(bsx->volid, x);
mklabel(bsx->label, o.volume_label ? o.volume_label : "NO NAME");
snprintf(buf, sizeof(buf), "FAT%u", o.fat_type);
setstr(bsx->type, buf, sizeof(bsx->type));
if (!o.bootstrap) {
x1 += sizeof(struct bsx);
bs = (struct bs *)img;
mk1(bs->jmp[0], 0xeb);
mk1(bs->jmp[1], x1 - 2);
mk1(bs->jmp[2], 0x90);
setstr(bs->oem, o.OEM_string ? o.OEM_string : "NetBSD",
sizeof(bs->oem));
memcpy(img + x1, bootcode, sizeof(bootcode));
mk2(img + MINBPS - 2, DOSMAGIC);
}
} else if (o.fat_type == 32 && bpb.infs != MAXU16 &&
(lsn == bpb.infs ||
(bpb.bkbs != MAXU16 &&
lsn == bpb.bkbs + bpb.infs))) {
mk4(img, 0x41615252);
mk4(img + MINBPS - 28, 0x61417272);
mk4(img + MINBPS - 24, 0xffffffff);
mk4(img + MINBPS - 20, 0xffffffff);
mk2(img + MINBPS - 2, DOSMAGIC);
} else if (lsn >= bpb.res && lsn < dir &&
!((lsn - bpb.res) %
(bpb.spf ? bpb.spf : bpb.bspf))) {
mk1(img[0], bpb.mid);
for (x = 1; x < o.fat_type * (o.fat_type == 32 ? 3U : 2U) / 8U; x++)
mk1(img[x], o.fat_type == 32 && x % 4 == 3 ? 0x0f : 0xff);
} else if (lsn == dir && o.volume_label) {
de = (struct de *)img;
mklabel(de->namext, o.volume_label);
mk1(de->attr, 050);
x = (u_int)tm->tm_hour << 11 |
(u_int)tm->tm_min << 5 |
(u_int)tm->tm_sec >> 1;
mk2(de->time, x);
x = (u_int)(tm->tm_year - 80) << 9 |
(u_int)(tm->tm_mon + 1) << 5 |
(u_int)tm->tm_mday;
mk2(de->date, x);
}
if ((n = write(fd, img, bpb.bps)) == -1) {
warn("%s", fname);
return -1;
}
if ((size_t)n != bpb.bps) {
warnx("%s: can't write sector %u", fname, lsn);
return -1;
}
}
}
return 0;
}
#ifndef MAKEFS
/*
* return -1 with error if file system is mounted.
*/
static int
check_mounted(const char *fname, mode_t mode)
{
struct statvfs *mp;
const char *s1, *s2;
size_t len;
int n, r;
if (!(n = getmntinfo(&mp, MNT_NOWAIT))) {
warn("getmntinfo");
return -1;
}
len = strlen(_PATH_DEV);
s1 = fname;
if (!strncmp(s1, _PATH_DEV, len))
s1 += len;
r = S_ISCHR(mode) && s1 != fname && *s1 == 'r';
for (; n--; mp++) {
s2 = mp->f_mntfromname;
if (!strncmp(s2, _PATH_DEV, len))
s2 += len;
if ((r && s2 != mp->f_mntfromname && !strcmp(s1 + 1, s2)) ||
!strcmp(s1, s2)) {
warnx("%s is mounted on %s", fname, mp->f_mntonname);
return -1;
}
}
return 0;
}
#endif
/*
* Get a standard format.
*/
static int
getstdfmt(const char *fmt, struct bpb *bpb)
{
u_int x, i;
x = sizeof(stdfmt) / sizeof(stdfmt[0]);
for (i = 0; i < x && strcmp(fmt, stdfmt[i].name); i++);
if (i == x) {
warnx("%s: unknown standard format", fmt);
return -1;
}
*bpb = stdfmt[i].bpb;
return 0;
}
/*
* Get disk slice, partition, and geometry information.
*/
static int
getbpbinfo(int fd, const char *fname, const char *dtype, int iflag,
struct bpb *bpb, int create)
{
const char *s1, *s2;
int part;
part = -1;
s1 = fname;
if ((s2 = strrchr(s1, '/')))
s1 = s2 + 1;
for (s2 = s1; *s2 && !isdigit((unsigned char)*s2); s2++);
if (!*s2 || s2 == s1)
s2 = NULL;
else
while (isdigit((unsigned char)*++s2));
s1 = s2;
#ifndef MAKEFS
int maxpartitions = getmaxpartitions();
// XXX: Does not work with wedges
if (s2 && *s2 >= 'a' && *s2 <= 'a' + maxpartitions - 1) {
part = *s2++ - 'a';
}
#endif
if (((part != -1) && ((!iflag && part != -1) || !bpb->bsec)) ||
!bpb->bps || !bpb->spt || !bpb->hds) {
u_int sector_size;
u_int nsectors;
u_int ntracks;
u_int size;
#ifndef MAKEFS
struct disk_geom geo;
struct dkwedge_info dkw;
if (!create && getdiskinfo(fname, fd, NULL, &geo, &dkw) != -1) {
sector_size = geo.dg_secsize = 512;
nsectors = geo.dg_nsectors = 63;
ntracks = geo.dg_ntracks = 255;
size = dkw.dkw_size;
} else
#endif
{
struct stat st;
if (fstat(fd, &st) == -1) {
warnx("Can't get disk size for `%s'", fname);
return -1;
}
/* create a fake geometry for a file image */
sector_size = 512;
nsectors = 63;
ntracks = 255;
size = st.st_size / sector_size;
}
if (!bpb->bps) {
if (ckgeom(fname, sector_size, "bytes/sector") == -1)
return -1;
bpb->bps = sector_size;
}
if (nsectors > 63) {
/*
* The kernel doesn't accept BPB with spt > 63.
* (see sys/fs/msdosfs/msdosfs_vfsops.c:msdosfs_mountfs())
* If values taken from disklabel don't match these
* restrictions, use popular BIOS default values instead.
*/
nsectors = 63;
}
if (!bpb->spt) {
if (ckgeom(fname, nsectors, "sectors/track") == -1)
return -1;
bpb->spt = nsectors;
}
if (!bpb->hds)
if (ckgeom(fname, ntracks, "drive heads") == -1)
return -1;
bpb->hds = ntracks;
if (!bpb->bsec)
bpb->bsec = size;
}
return 0;
}
/*
* Print out BPB values.
*/
static void
print_bpb(struct bpb *bpb)
{
printf("bps=%u spc=%u res=%u nft=%u", bpb->bps, bpb->spc, bpb->res,
bpb->nft);
if (bpb->rde)
printf(" rde=%u", bpb->rde);
if (bpb->sec)
printf(" sec=%u", bpb->sec);
printf(" mid=%#x", bpb->mid);
if (bpb->spf)
printf(" spf=%u", bpb->spf);
printf(" spt=%u hds=%u hid=%u", bpb->spt, bpb->hds, bpb->hid);
if (bpb->bsec)
printf(" bsec=%u", bpb->bsec);
if (!bpb->spf) {
printf(" bspf=%u rdcl=%u", bpb->bspf, bpb->rdcl);
printf(" infs=");
printf(bpb->infs == MAXU16 ? "%#x" : "%u", bpb->infs);
printf(" bkbs=");
printf(bpb->bkbs == MAXU16 ? "%#x" : "%u", bpb->bkbs);
}
printf("\n");
}
/*
* Check a disk geometry value.
*/
static int
ckgeom(const char *fname, u_int val, const char *msg)
{
if (!val) {
warnx("%s: no default %s", fname, msg);
return -1;
}
if (val > MAXU16) {
warnx("%s: illegal %s", fname, msg);
return -1;
}
return 0;
}
/*
* Check a volume label.
*/
static int
oklabel(const char *src)
{
int c, i;
for (i = 0; i <= 11; i++) {
c = (u_char)*src++;
if (c < ' ' + !i || strchr("\"*+,./:;<=>?[\\]|", c))
break;
}
return i && !c;
}
/*
* Make a volume label.
*/
static void
mklabel(u_int8_t *dest, const char *src)
{
int c, i;
for (i = 0; i < 11; i++) {
c = *src ? toupper((unsigned char)*src++) : ' ';
*dest++ = !i && c == '\xe5' ? 5 : c;
}
}
/*
* Copy string, padding with spaces.
*/
static void
setstr(u_int8_t *dest, const char *src, size_t len)
{
while (len--)
*dest++ = *src ? *src++ : ' ';
}
static void
infohandler(int sig)
{
got_siginfo = 1;
}
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