b0daff4ba7
- Fail with an understandable error message if we cannot detect the sector size, instead of later failing with an error about /boot/mbr not being a multiple of the sector size (since we end up with an assumed sector size of MAX_SEC_SIZE * 2). - We query the sector size via an IOCTL anyway, so if that succeeds use that instead of probing for it via read(2) calls. This fixes the problem with fdisk failing to operate on at least graid3 and md(4) devices on kernels with src/sys/geom/geom_dev.c before rev. 1.90, due to fdisk failing to detect the sector size. - When detecting the root device allow "/" characters in it, which happens with e.g. gmirror devices.
1416 lines
33 KiB
C
1416 lines
33 KiB
C
/*
|
||
* Mach Operating System
|
||
* Copyright (c) 1992 Carnegie Mellon University
|
||
* All Rights Reserved.
|
||
*
|
||
* Permission to use, copy, modify and distribute this software and its
|
||
* documentation is hereby granted, provided that both the copyright
|
||
* notice and this permission notice appear in all copies of the
|
||
* software, derivative works or modified versions, and any portions
|
||
* thereof, and that both notices appear in supporting documentation.
|
||
*
|
||
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
||
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
|
||
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
||
*
|
||
* Carnegie Mellon requests users of this software to return to
|
||
*
|
||
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
||
* School of Computer Science
|
||
* Carnegie Mellon University
|
||
* Pittsburgh PA 15213-3890
|
||
*
|
||
* any improvements or extensions that they make and grant Carnegie Mellon
|
||
* the rights to redistribute these changes.
|
||
*/
|
||
|
||
#include <sys/cdefs.h>
|
||
__FBSDID("$FreeBSD$");
|
||
|
||
#include <sys/disk.h>
|
||
#include <sys/disklabel.h>
|
||
#include <sys/diskmbr.h>
|
||
#include <sys/endian.h>
|
||
#include <sys/param.h>
|
||
#include <sys/stat.h>
|
||
#include <sys/mount.h>
|
||
#include <ctype.h>
|
||
#include <fcntl.h>
|
||
#include <err.h>
|
||
#include <errno.h>
|
||
#include <libgeom.h>
|
||
#include <paths.h>
|
||
#include <regex.h>
|
||
#include <stdint.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <unistd.h>
|
||
|
||
int iotest;
|
||
|
||
#define LBUF 100
|
||
static char lbuf[LBUF];
|
||
|
||
/*
|
||
*
|
||
* Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
|
||
*
|
||
* 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
|
||
* Copyright (c) 1989 Robert. V. Baron
|
||
* Created.
|
||
*/
|
||
|
||
#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp
|
||
|
||
#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs)
|
||
|
||
#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */
|
||
#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
|
||
static int secsize = 0; /* the sensed sector size */
|
||
|
||
static char *disk;
|
||
|
||
static int cyls, sectors, heads, cylsecs, disksecs;
|
||
|
||
struct mboot {
|
||
unsigned char padding[2]; /* force the longs to be long aligned */
|
||
unsigned char *bootinst; /* boot code */
|
||
off_t bootinst_size;
|
||
struct dos_partition parts[NDOSPART];
|
||
};
|
||
|
||
static struct mboot mboot;
|
||
static int fd;
|
||
|
||
#define ACTIVE 0x80
|
||
|
||
static uint dos_cyls;
|
||
static uint dos_heads;
|
||
static uint dos_sectors;
|
||
static uint dos_cylsecs;
|
||
|
||
#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
|
||
#define DOSCYL(c) (c & 0xff)
|
||
|
||
#define MAX_ARGS 10
|
||
|
||
static int current_line_number;
|
||
|
||
static int geom_processed = 0;
|
||
static int part_processed = 0;
|
||
static int active_processed = 0;
|
||
|
||
typedef struct cmd {
|
||
char cmd;
|
||
int n_args;
|
||
struct arg {
|
||
char argtype;
|
||
int arg_val;
|
||
} args[MAX_ARGS];
|
||
} CMD;
|
||
|
||
static int B_flag = 0; /* replace boot code */
|
||
static int I_flag = 0; /* use entire disk for FreeBSD */
|
||
static int a_flag = 0; /* set active partition */
|
||
static char *b_flag = NULL; /* path to boot code */
|
||
static int i_flag = 0; /* replace partition data */
|
||
static int u_flag = 0; /* update partition data */
|
||
static int s_flag = 0; /* Print a summary and exit */
|
||
static int t_flag = 0; /* test only */
|
||
static char *f_flag = NULL; /* Read config info from file */
|
||
static int v_flag = 0; /* Be verbose */
|
||
|
||
static struct part_type
|
||
{
|
||
unsigned char type;
|
||
const char *name;
|
||
} part_types[] = {
|
||
{0x00, "unused"}
|
||
,{0x01, "Primary DOS with 12 bit FAT"}
|
||
,{0x02, "XENIX / file system"}
|
||
,{0x03, "XENIX /usr file system"}
|
||
,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"}
|
||
,{0x05, "Extended DOS"}
|
||
,{0x06, "Primary 'big' DOS (>= 32MB)"}
|
||
,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"}
|
||
,{0x08, "AIX file system or SplitDrive"}
|
||
,{0x09, "AIX boot partition or Coherent"}
|
||
,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"}
|
||
,{0x0B, "DOS or Windows 95 with 32 bit FAT"}
|
||
,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"}
|
||
,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"}
|
||
,{0x0F, "Extended DOS (LBA)"}
|
||
,{0x10, "OPUS"}
|
||
,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"}
|
||
,{0x12, "Compaq diagnostics"}
|
||
,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"}
|
||
,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"}
|
||
,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"}
|
||
,{0x18, "AST Windows swapfile"}
|
||
,{0x24, "NEC DOS"}
|
||
,{0x3C, "PartitionMagic recovery"}
|
||
,{0x39, "plan9"}
|
||
,{0x40, "VENIX 286"}
|
||
,{0x41, "Linux/MINIX (sharing disk with DRDOS)"}
|
||
,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"}
|
||
,{0x43, "Linux native (sharing disk with DRDOS)"}
|
||
,{0x4D, "QNX 4.2 Primary"}
|
||
,{0x4E, "QNX 4.2 Secondary"}
|
||
,{0x4F, "QNX 4.2 Tertiary"}
|
||
,{0x50, "DM (disk manager)"}
|
||
,{0x51, "DM6 Aux1 (or Novell)"}
|
||
,{0x52, "CP/M or Microport SysV/AT"}
|
||
,{0x53, "DM6 Aux3"}
|
||
,{0x54, "DM6"}
|
||
,{0x55, "EZ-Drive (disk manager)"}
|
||
,{0x56, "Golden Bow (disk manager)"}
|
||
,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */
|
||
,{0x61, "SpeedStor"}
|
||
,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"}
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||
,{0x64, "Novell Netware/286 2.xx"}
|
||
,{0x65, "Novell Netware/386 3.xx"}
|
||
,{0x70, "DiskSecure Multi-Boot"}
|
||
,{0x75, "PCIX"}
|
||
,{0x77, "QNX4.x"}
|
||
,{0x78, "QNX4.x 2nd part"}
|
||
,{0x79, "QNX4.x 3rd part"}
|
||
,{0x80, "Minix until 1.4a"}
|
||
,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"}
|
||
,{0x82, "Linux swap or Solaris x86"}
|
||
,{0x83, "Linux native"}
|
||
,{0x84, "OS/2 hidden C: drive"}
|
||
,{0x85, "Linux extended"}
|
||
,{0x86, "NTFS volume set??"}
|
||
,{0x87, "NTFS volume set??"}
|
||
,{0x93, "Amoeba file system"}
|
||
,{0x94, "Amoeba bad block table"}
|
||
,{0x9F, "BSD/OS"}
|
||
,{0xA0, "Suspend to Disk"}
|
||
,{0xA5, "FreeBSD/NetBSD/386BSD"}
|
||
,{0xA6, "OpenBSD"}
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||
,{0xA7, "NeXTSTEP"}
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||
,{0xA9, "NetBSD"}
|
||
,{0xAC, "IBM JFS"}
|
||
,{0xB7, "BSDI BSD/386 file system"}
|
||
,{0xB8, "BSDI BSD/386 swap"}
|
||
,{0xBE, "Solaris x86 boot"}
|
||
,{0xBF, "Solaris x86 (new)"}
|
||
,{0xC1, "DRDOS/sec with 12-bit FAT"}
|
||
,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"}
|
||
,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"}
|
||
,{0xC7, "Syrinx"}
|
||
,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"}
|
||
,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"}
|
||
,{0xE3, "DOS R/O or SpeedStor"}
|
||
,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."}
|
||
,{0xEB, "BeOS file system"}
|
||
,{0xEE, "EFI GPT"}
|
||
,{0xEF, "EFI System Partition"}
|
||
,{0xF1, "SpeedStor"}
|
||
,{0xF2, "DOS 3.3+ Secondary"}
|
||
,{0xF4, "SpeedStor large partition"}
|
||
,{0xFE, "SpeedStor >1024 cyl. or LANstep"}
|
||
,{0xFF, "Xenix bad blocks table"}
|
||
};
|
||
|
||
static void print_s0(int which);
|
||
static void print_part(int i);
|
||
static void init_sector0(unsigned long start);
|
||
static void init_boot(void);
|
||
static void change_part(int i);
|
||
static void print_params(void);
|
||
static void change_active(int which);
|
||
static void change_code(void);
|
||
static void get_params_to_use(void);
|
||
static char *get_rootdisk(void);
|
||
static void dos(struct dos_partition *partp);
|
||
static int open_disk(int flag);
|
||
static ssize_t read_disk(off_t sector, void *buf);
|
||
static int write_disk(off_t sector, void *buf);
|
||
static int get_params(void);
|
||
static int read_s0(void);
|
||
static int write_s0(void);
|
||
static int ok(const char *str);
|
||
static int decimal(const char *str, int *num, int deflt);
|
||
static const char *get_type(int type);
|
||
static int read_config(char *config_file);
|
||
static void reset_boot(void);
|
||
static int sanitize_partition(struct dos_partition *);
|
||
static void usage(void);
|
||
|
||
int
|
||
main(int argc, char *argv[])
|
||
{
|
||
struct stat sb;
|
||
int c, i;
|
||
int partition = -1;
|
||
struct dos_partition *partp;
|
||
|
||
while ((c = getopt(argc, argv, "BIab:f:istuv1234")) != -1)
|
||
switch (c) {
|
||
case 'B':
|
||
B_flag = 1;
|
||
break;
|
||
case 'I':
|
||
I_flag = 1;
|
||
break;
|
||
case 'a':
|
||
a_flag = 1;
|
||
break;
|
||
case 'b':
|
||
b_flag = optarg;
|
||
break;
|
||
case 'f':
|
||
f_flag = optarg;
|
||
break;
|
||
case 'i':
|
||
i_flag = 1;
|
||
break;
|
||
case 's':
|
||
s_flag = 1;
|
||
break;
|
||
case 't':
|
||
t_flag = 1;
|
||
break;
|
||
case 'u':
|
||
u_flag = 1;
|
||
break;
|
||
case 'v':
|
||
v_flag = 1;
|
||
break;
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
partition = c - '0';
|
||
break;
|
||
default:
|
||
usage();
|
||
}
|
||
if (f_flag || i_flag)
|
||
u_flag = 1;
|
||
if (t_flag)
|
||
v_flag = 1;
|
||
argc -= optind;
|
||
argv += optind;
|
||
|
||
if (argc == 0) {
|
||
disk = get_rootdisk();
|
||
} else {
|
||
if (stat(argv[0], &sb) == 0) {
|
||
/* OK, full pathname given */
|
||
disk = argv[0];
|
||
} else if (errno == ENOENT && argv[0][0] != '/') {
|
||
/* Try prepending "/dev" */
|
||
asprintf(&disk, "%s%s", _PATH_DEV, argv[0]);
|
||
if (disk == NULL)
|
||
errx(1, "out of memory");
|
||
} else {
|
||
/* other stat error, let it fail below */
|
||
disk = argv[0];
|
||
}
|
||
}
|
||
if (open_disk(u_flag) < 0)
|
||
err(1, "cannot open disk %s", disk);
|
||
|
||
/* (abu)use mboot.bootinst to probe for the sector size */
|
||
if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
|
||
err(1, "cannot allocate buffer to determine disk sector size");
|
||
if (read_disk(0, mboot.bootinst) == -1)
|
||
errx(1, "could not detect sector size");
|
||
free(mboot.bootinst);
|
||
mboot.bootinst = NULL;
|
||
|
||
if (s_flag) {
|
||
if (read_s0())
|
||
err(1, "read_s0");
|
||
printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
|
||
dos_sectors);
|
||
printf("Part %11s %11s Type Flags\n", "Start", "Size");
|
||
for (i = 0; i < NDOSPART; i++) {
|
||
partp = ((struct dos_partition *) &mboot.parts) + i;
|
||
if (partp->dp_start == 0 && partp->dp_size == 0)
|
||
continue;
|
||
printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
|
||
(u_long) partp->dp_start,
|
||
(u_long) partp->dp_size, partp->dp_typ,
|
||
partp->dp_flag);
|
||
}
|
||
exit(0);
|
||
}
|
||
|
||
printf("******* Working on device %s *******\n",disk);
|
||
|
||
if (I_flag) {
|
||
read_s0();
|
||
reset_boot();
|
||
partp = (struct dos_partition *) (&mboot.parts[0]);
|
||
partp->dp_typ = DOSPTYP_386BSD;
|
||
partp->dp_flag = ACTIVE;
|
||
partp->dp_start = dos_sectors;
|
||
partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs -
|
||
dos_sectors;
|
||
dos(partp);
|
||
if (v_flag)
|
||
print_s0(-1);
|
||
if (!t_flag)
|
||
write_s0();
|
||
exit(0);
|
||
}
|
||
if (f_flag) {
|
||
if (read_s0() || i_flag)
|
||
reset_boot();
|
||
if (!read_config(f_flag))
|
||
exit(1);
|
||
if (v_flag)
|
||
print_s0(-1);
|
||
if (!t_flag)
|
||
write_s0();
|
||
} else {
|
||
if(u_flag)
|
||
get_params_to_use();
|
||
else
|
||
print_params();
|
||
|
||
if (read_s0())
|
||
init_sector0(dos_sectors);
|
||
|
||
printf("Media sector size is %d\n", secsize);
|
||
printf("Warning: BIOS sector numbering starts with sector 1\n");
|
||
printf("Information from DOS bootblock is:\n");
|
||
if (partition == -1)
|
||
for (i = 1; i <= NDOSPART; i++)
|
||
change_part(i);
|
||
else
|
||
change_part(partition);
|
||
|
||
if (u_flag || a_flag)
|
||
change_active(partition);
|
||
|
||
if (B_flag)
|
||
change_code();
|
||
|
||
if (u_flag || a_flag || B_flag) {
|
||
if (!t_flag) {
|
||
printf("\nWe haven't changed the partition table yet. ");
|
||
printf("This is your last chance.\n");
|
||
}
|
||
print_s0(-1);
|
||
if (!t_flag) {
|
||
if (ok("Should we write new partition table?"))
|
||
write_s0();
|
||
} else {
|
||
printf("\n-t flag specified -- partition table not written.\n");
|
||
}
|
||
}
|
||
}
|
||
|
||
exit(0);
|
||
}
|
||
|
||
static void
|
||
usage()
|
||
{
|
||
fprintf(stderr, "%s%s",
|
||
"usage: fdisk [-BIaistu] [-b bootcode] [-1234] [disk]\n",
|
||
" fdisk -f configfile [-itv] [disk]\n");
|
||
exit(1);
|
||
}
|
||
|
||
static void
|
||
print_s0(int which)
|
||
{
|
||
int i;
|
||
|
||
print_params();
|
||
printf("Information from DOS bootblock is:\n");
|
||
if (which == -1)
|
||
for (i = 1; i <= NDOSPART; i++)
|
||
printf("%d: ", i), print_part(i);
|
||
else
|
||
print_part(which);
|
||
}
|
||
|
||
static struct dos_partition mtpart;
|
||
|
||
static void
|
||
print_part(int i)
|
||
{
|
||
struct dos_partition *partp;
|
||
u_int64_t part_mb;
|
||
|
||
partp = ((struct dos_partition *) &mboot.parts) + i - 1;
|
||
|
||
if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
|
||
printf("<UNUSED>\n");
|
||
return;
|
||
}
|
||
/*
|
||
* Be careful not to overflow.
|
||
*/
|
||
part_mb = partp->dp_size;
|
||
part_mb *= secsize;
|
||
part_mb /= (1024 * 1024);
|
||
printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ,
|
||
get_type(partp->dp_typ));
|
||
printf(" start %lu, size %lu (%ju Meg), flag %x%s\n",
|
||
(u_long)partp->dp_start,
|
||
(u_long)partp->dp_size,
|
||
(uintmax_t)part_mb,
|
||
partp->dp_flag,
|
||
partp->dp_flag == ACTIVE ? " (active)" : "");
|
||
printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
|
||
,DPCYL(partp->dp_scyl, partp->dp_ssect)
|
||
,partp->dp_shd
|
||
,DPSECT(partp->dp_ssect)
|
||
,DPCYL(partp->dp_ecyl, partp->dp_esect)
|
||
,partp->dp_ehd
|
||
,DPSECT(partp->dp_esect));
|
||
}
|
||
|
||
|
||
static void
|
||
init_boot(void)
|
||
{
|
||
#ifndef __ia64__
|
||
const char *fname;
|
||
int fdesc, n;
|
||
struct stat sb;
|
||
|
||
fname = b_flag ? b_flag : "/boot/mbr";
|
||
if ((fdesc = open(fname, O_RDONLY)) == -1 ||
|
||
fstat(fdesc, &sb) == -1)
|
||
err(1, "%s", fname);
|
||
if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
|
||
errx(1, "%s: length must be a multiple of sector size", fname);
|
||
if (mboot.bootinst != NULL)
|
||
free(mboot.bootinst);
|
||
if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
|
||
errx(1, "%s: unable to allocate read buffer", fname);
|
||
if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
|
||
close(fdesc))
|
||
err(1, "%s", fname);
|
||
if (n != mboot.bootinst_size)
|
||
errx(1, "%s: short read", fname);
|
||
#else
|
||
if (mboot.bootinst != NULL)
|
||
free(mboot.bootinst);
|
||
mboot.bootinst_size = secsize;
|
||
if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL)
|
||
errx(1, "unable to allocate boot block buffer");
|
||
memset(mboot.bootinst, 0, mboot.bootinst_size);
|
||
le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
|
||
#endif
|
||
}
|
||
|
||
|
||
static void
|
||
init_sector0(unsigned long start)
|
||
{
|
||
struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]);
|
||
|
||
init_boot();
|
||
|
||
partp->dp_typ = DOSPTYP_386BSD;
|
||
partp->dp_flag = ACTIVE;
|
||
start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors;
|
||
if(start == 0)
|
||
start = dos_sectors;
|
||
partp->dp_start = start;
|
||
partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start;
|
||
|
||
dos(partp);
|
||
}
|
||
|
||
static void
|
||
change_part(int i)
|
||
{
|
||
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1;
|
||
|
||
printf("The data for partition %d is:\n", i);
|
||
print_part(i);
|
||
|
||
if (u_flag && ok("Do you want to change it?")) {
|
||
int tmp;
|
||
|
||
if (i_flag) {
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
if (i == 1) {
|
||
init_sector0(1);
|
||
printf("\nThe static data for the slice 1 has been reinitialized to:\n");
|
||
print_part(i);
|
||
}
|
||
}
|
||
|
||
do {
|
||
Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp);
|
||
Decimal("start", partp->dp_start, tmp);
|
||
Decimal("size", partp->dp_size, tmp);
|
||
if (!sanitize_partition(partp)) {
|
||
warnx("ERROR: failed to adjust; setting sysid to 0");
|
||
partp->dp_typ = 0;
|
||
}
|
||
|
||
if (ok("Explicitly specify beg/end address ?"))
|
||
{
|
||
int tsec,tcyl,thd;
|
||
tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
|
||
thd = partp->dp_shd;
|
||
tsec = DPSECT(partp->dp_ssect);
|
||
Decimal("beginning cylinder", tcyl, tmp);
|
||
Decimal("beginning head", thd, tmp);
|
||
Decimal("beginning sector", tsec, tmp);
|
||
partp->dp_scyl = DOSCYL(tcyl);
|
||
partp->dp_ssect = DOSSECT(tsec,tcyl);
|
||
partp->dp_shd = thd;
|
||
|
||
tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
|
||
thd = partp->dp_ehd;
|
||
tsec = DPSECT(partp->dp_esect);
|
||
Decimal("ending cylinder", tcyl, tmp);
|
||
Decimal("ending head", thd, tmp);
|
||
Decimal("ending sector", tsec, tmp);
|
||
partp->dp_ecyl = DOSCYL(tcyl);
|
||
partp->dp_esect = DOSSECT(tsec,tcyl);
|
||
partp->dp_ehd = thd;
|
||
} else
|
||
dos(partp);
|
||
|
||
print_part(i);
|
||
} while (!ok("Are we happy with this entry?"));
|
||
}
|
||
}
|
||
|
||
static void
|
||
print_params()
|
||
{
|
||
printf("parameters extracted from in-core disklabel are:\n");
|
||
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
|
||
,cyls,heads,sectors,cylsecs);
|
||
if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
|
||
printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
|
||
printf("parameters to be used for BIOS calculations are:\n");
|
||
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
|
||
,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
|
||
}
|
||
|
||
static void
|
||
change_active(int which)
|
||
{
|
||
struct dos_partition *partp = &mboot.parts[0];
|
||
int active, i, new, tmp;
|
||
|
||
active = -1;
|
||
for (i = 0; i < NDOSPART; i++) {
|
||
if ((partp[i].dp_flag & ACTIVE) == 0)
|
||
continue;
|
||
printf("Partition %d is marked active\n", i + 1);
|
||
if (active == -1)
|
||
active = i + 1;
|
||
}
|
||
if (a_flag && which != -1)
|
||
active = which;
|
||
else if (active == -1)
|
||
active = 1;
|
||
|
||
if (!ok("Do you want to change the active partition?"))
|
||
return;
|
||
setactive:
|
||
do {
|
||
new = active;
|
||
Decimal("active partition", new, tmp);
|
||
if (new < 1 || new > 4) {
|
||
printf("Active partition number must be in range 1-4."
|
||
" Try again.\n");
|
||
goto setactive;
|
||
}
|
||
active = new;
|
||
} while (!ok("Are you happy with this choice"));
|
||
for (i = 0; i < NDOSPART; i++)
|
||
partp[i].dp_flag = 0;
|
||
if (active > 0 && active <= NDOSPART)
|
||
partp[active-1].dp_flag = ACTIVE;
|
||
}
|
||
|
||
static void
|
||
change_code()
|
||
{
|
||
if (ok("Do you want to change the boot code?"))
|
||
init_boot();
|
||
}
|
||
|
||
void
|
||
get_params_to_use()
|
||
{
|
||
int tmp;
|
||
print_params();
|
||
if (ok("Do you want to change our idea of what BIOS thinks ?"))
|
||
{
|
||
do
|
||
{
|
||
Decimal("BIOS's idea of #cylinders", dos_cyls, tmp);
|
||
Decimal("BIOS's idea of #heads", dos_heads, tmp);
|
||
Decimal("BIOS's idea of #sectors", dos_sectors, tmp);
|
||
dos_cylsecs = dos_heads * dos_sectors;
|
||
print_params();
|
||
}
|
||
while(!ok("Are you happy with this choice"));
|
||
}
|
||
}
|
||
|
||
|
||
/***********************************************\
|
||
* Change real numbers into strange dos numbers *
|
||
\***********************************************/
|
||
static void
|
||
dos(struct dos_partition *partp)
|
||
{
|
||
int cy, sec;
|
||
u_int32_t end;
|
||
|
||
if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
|
||
memcpy(partp, &mtpart, sizeof(*partp));
|
||
return;
|
||
}
|
||
|
||
/* Start c/h/s. */
|
||
partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
|
||
cy = partp->dp_start / dos_cylsecs;
|
||
sec = partp->dp_start % dos_sectors + 1;
|
||
partp->dp_scyl = DOSCYL(cy);
|
||
partp->dp_ssect = DOSSECT(sec, cy);
|
||
|
||
/* End c/h/s. */
|
||
end = partp->dp_start + partp->dp_size - 1;
|
||
partp->dp_ehd = end % dos_cylsecs / dos_sectors;
|
||
cy = end / dos_cylsecs;
|
||
sec = end % dos_sectors + 1;
|
||
partp->dp_ecyl = DOSCYL(cy);
|
||
partp->dp_esect = DOSSECT(sec, cy);
|
||
}
|
||
|
||
static int
|
||
open_disk(int flag)
|
||
{
|
||
struct stat st;
|
||
int rwmode;
|
||
|
||
if (stat(disk, &st) == -1) {
|
||
if (errno == ENOENT)
|
||
return -2;
|
||
warnx("can't get file status of %s", disk);
|
||
return -1;
|
||
}
|
||
if ( !(st.st_mode & S_IFCHR) )
|
||
warnx("device %s is not character special", disk);
|
||
rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY;
|
||
fd = open(disk, rwmode);
|
||
if (fd == -1 && errno == EPERM && rwmode == O_RDWR)
|
||
fd = open(disk, O_RDONLY);
|
||
if (fd == -1 && errno == ENXIO)
|
||
return -2;
|
||
if (fd == -1) {
|
||
warnx("can't open device %s", disk);
|
||
return -1;
|
||
}
|
||
if (get_params() == -1) {
|
||
warnx("can't get disk parameters on %s", disk);
|
||
return -1;
|
||
}
|
||
return fd;
|
||
}
|
||
|
||
static ssize_t
|
||
read_disk(off_t sector, void *buf)
|
||
{
|
||
|
||
lseek(fd, (sector * 512), 0);
|
||
if (secsize == 0)
|
||
for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
|
||
secsize *= 2) {
|
||
/* try the read */
|
||
int size = read(fd, buf, secsize);
|
||
if (size == secsize)
|
||
/* it worked so return */
|
||
return secsize;
|
||
}
|
||
else
|
||
return read(fd, buf, secsize);
|
||
|
||
/* we failed to read at any of the sizes */
|
||
return -1;
|
||
}
|
||
|
||
static int
|
||
write_disk(off_t sector, void *buf)
|
||
{
|
||
int error;
|
||
struct gctl_req *grq;
|
||
const char *q;
|
||
char fbuf[BUFSIZ];
|
||
int i, fdw;
|
||
|
||
grq = gctl_get_handle();
|
||
gctl_ro_param(grq, "verb", -1, "write MBR");
|
||
gctl_ro_param(grq, "class", -1, "MBR");
|
||
q = strrchr(disk, '/');
|
||
if (q == NULL)
|
||
q = disk;
|
||
else
|
||
q++;
|
||
gctl_ro_param(grq, "geom", -1, q);
|
||
gctl_ro_param(grq, "data", secsize, buf);
|
||
q = gctl_issue(grq);
|
||
if (q == NULL) {
|
||
gctl_free(grq);
|
||
return(0);
|
||
}
|
||
warnx("%s", q);
|
||
gctl_free(grq);
|
||
|
||
error = pwrite(fd, buf, secsize, (sector * 512));
|
||
if (error == secsize)
|
||
return (0);
|
||
|
||
for (i = 1; i < 5; i++) {
|
||
sprintf(fbuf, "%ss%d", disk, i);
|
||
fdw = open(fbuf, O_RDWR, 0);
|
||
if (fdw < 0)
|
||
continue;
|
||
error = ioctl(fdw, DIOCSMBR, buf);
|
||
close(fdw);
|
||
if (error == 0)
|
||
return (0);
|
||
}
|
||
warnx("Failed to write sector zero");
|
||
return(EINVAL);
|
||
}
|
||
|
||
static int
|
||
get_params()
|
||
{
|
||
int error;
|
||
u_int u;
|
||
off_t o;
|
||
|
||
error = ioctl(fd, DIOCGFWSECTORS, &u);
|
||
if (error == 0)
|
||
sectors = dos_sectors = u;
|
||
else
|
||
sectors = dos_sectors = 63;
|
||
|
||
error = ioctl(fd, DIOCGFWHEADS, &u);
|
||
if (error == 0)
|
||
heads = dos_heads = u;
|
||
else
|
||
heads = dos_heads = 255;
|
||
|
||
dos_cylsecs = cylsecs = heads * sectors;
|
||
disksecs = cyls * heads * sectors;
|
||
|
||
error = ioctl(fd, DIOCGSECTORSIZE, &u);
|
||
if (error != 0 || u == 0)
|
||
u = 512;
|
||
else
|
||
secsize = u;
|
||
|
||
error = ioctl(fd, DIOCGMEDIASIZE, &o);
|
||
if (error == 0) {
|
||
disksecs = o / u;
|
||
cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
|
||
}
|
||
|
||
return (disksecs);
|
||
}
|
||
|
||
|
||
static int
|
||
read_s0()
|
||
{
|
||
int i;
|
||
|
||
mboot.bootinst_size = secsize;
|
||
if (mboot.bootinst != NULL)
|
||
free(mboot.bootinst);
|
||
if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
|
||
warnx("unable to allocate buffer to read fdisk "
|
||
"partition table");
|
||
return -1;
|
||
}
|
||
if (read_disk(0, mboot.bootinst) == -1) {
|
||
warnx("can't read fdisk partition table");
|
||
return -1;
|
||
}
|
||
if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
|
||
warnx("invalid fdisk partition table found");
|
||
/* So should we initialize things */
|
||
return -1;
|
||
}
|
||
for (i = 0; i < NDOSPART; i++)
|
||
dos_partition_dec(
|
||
&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
|
||
&mboot.parts[i]);
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
write_s0()
|
||
{
|
||
int sector, i;
|
||
|
||
if (iotest) {
|
||
print_s0(-1);
|
||
return 0;
|
||
}
|
||
for(i = 0; i < NDOSPART; i++)
|
||
dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
|
||
&mboot.parts[i]);
|
||
le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
|
||
for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
|
||
if (write_disk(sector,
|
||
&mboot.bootinst[sector * secsize]) == -1) {
|
||
warn("can't write fdisk partition table");
|
||
return -1;
|
||
}
|
||
return(0);
|
||
}
|
||
|
||
|
||
static int
|
||
ok(const char *str)
|
||
{
|
||
printf("%s [n] ", str);
|
||
fflush(stdout);
|
||
if (fgets(lbuf, LBUF, stdin) == NULL)
|
||
exit(1);
|
||
lbuf[strlen(lbuf)-1] = 0;
|
||
|
||
if (*lbuf &&
|
||
(!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
|
||
!strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
|
||
return 1;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
decimal(const char *str, int *num, int deflt)
|
||
{
|
||
int acc = 0, c;
|
||
char *cp;
|
||
|
||
while (1) {
|
||
printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
|
||
fflush(stdout);
|
||
if (fgets(lbuf, LBUF, stdin) == NULL)
|
||
exit(1);
|
||
lbuf[strlen(lbuf)-1] = 0;
|
||
|
||
if (!*lbuf)
|
||
return 0;
|
||
|
||
cp = lbuf;
|
||
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
|
||
if (!c)
|
||
return 0;
|
||
while ((c = *cp++)) {
|
||
if (c <= '9' && c >= '0')
|
||
acc = acc * 10 + c - '0';
|
||
else
|
||
break;
|
||
}
|
||
if (c == ' ' || c == '\t')
|
||
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
|
||
if (!c) {
|
||
*num = acc;
|
||
return 1;
|
||
} else
|
||
printf("%s is an invalid decimal number. Try again.\n",
|
||
lbuf);
|
||
}
|
||
|
||
}
|
||
|
||
static const char *
|
||
get_type(int type)
|
||
{
|
||
int numentries = (sizeof(part_types)/sizeof(struct part_type));
|
||
int counter = 0;
|
||
struct part_type *ptr = part_types;
|
||
|
||
|
||
while(counter < numentries) {
|
||
if(ptr->type == type)
|
||
return(ptr->name);
|
||
ptr++;
|
||
counter++;
|
||
}
|
||
return("unknown");
|
||
}
|
||
|
||
|
||
static void
|
||
parse_config_line(char *line, CMD *command)
|
||
{
|
||
char *cp, *end;
|
||
|
||
cp = line;
|
||
while (1) {
|
||
memset(command, 0, sizeof(*command));
|
||
|
||
while (isspace(*cp)) ++cp;
|
||
if (*cp == '\0' || *cp == '#')
|
||
break;
|
||
command->cmd = *cp++;
|
||
|
||
/*
|
||
* Parse args
|
||
*/
|
||
while (1) {
|
||
while (isspace(*cp)) ++cp;
|
||
if (*cp == '#')
|
||
break; /* found comment */
|
||
if (isalpha(*cp))
|
||
command->args[command->n_args].argtype = *cp++;
|
||
if (!isdigit(*cp))
|
||
break; /* assume end of line */
|
||
end = NULL;
|
||
command->args[command->n_args].arg_val = strtol(cp, &end, 0);
|
||
if (cp == end)
|
||
break; /* couldn't parse number */
|
||
cp = end;
|
||
command->n_args++;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
static int
|
||
process_geometry(CMD *command)
|
||
{
|
||
int status = 1, i;
|
||
|
||
while (1) {
|
||
geom_processed = 1;
|
||
if (part_processed) {
|
||
warnx(
|
||
"ERROR line %d: the geometry specification line must occur before\n\
|
||
all partition specifications",
|
||
current_line_number);
|
||
status = 0;
|
||
break;
|
||
}
|
||
if (command->n_args != 3) {
|
||
warnx("ERROR line %d: incorrect number of geometry args",
|
||
current_line_number);
|
||
status = 0;
|
||
break;
|
||
}
|
||
dos_cyls = 0;
|
||
dos_heads = 0;
|
||
dos_sectors = 0;
|
||
for (i = 0; i < 3; ++i) {
|
||
switch (command->args[i].argtype) {
|
||
case 'c':
|
||
dos_cyls = command->args[i].arg_val;
|
||
break;
|
||
case 'h':
|
||
dos_heads = command->args[i].arg_val;
|
||
break;
|
||
case 's':
|
||
dos_sectors = command->args[i].arg_val;
|
||
break;
|
||
default:
|
||
warnx(
|
||
"ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
|
||
current_line_number, command->args[i].argtype,
|
||
command->args[i].argtype);
|
||
status = 0;
|
||
break;
|
||
}
|
||
}
|
||
if (status == 0)
|
||
break;
|
||
|
||
dos_cylsecs = dos_heads * dos_sectors;
|
||
|
||
/*
|
||
* Do sanity checks on parameter values
|
||
*/
|
||
if (dos_cyls == 0) {
|
||
warnx("ERROR line %d: number of cylinders not specified",
|
||
current_line_number);
|
||
status = 0;
|
||
}
|
||
if (dos_cyls > 1024) {
|
||
warnx(
|
||
"WARNING line %d: number of cylinders (%d) may be out-of-range\n\
|
||
(must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
|
||
is dedicated to FreeBSD)",
|
||
current_line_number, dos_cyls);
|
||
}
|
||
|
||
if (dos_heads == 0) {
|
||
warnx("ERROR line %d: number of heads not specified",
|
||
current_line_number);
|
||
status = 0;
|
||
} else if (dos_heads > 256) {
|
||
warnx("ERROR line %d: number of heads must be within (1-256)",
|
||
current_line_number);
|
||
status = 0;
|
||
}
|
||
|
||
if (dos_sectors == 0) {
|
||
warnx("ERROR line %d: number of sectors not specified",
|
||
current_line_number);
|
||
status = 0;
|
||
} else if (dos_sectors > 63) {
|
||
warnx("ERROR line %d: number of sectors must be within (1-63)",
|
||
current_line_number);
|
||
status = 0;
|
||
}
|
||
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
process_partition(CMD *command)
|
||
{
|
||
int status = 0, partition;
|
||
u_int32_t prev_head_boundary, prev_cyl_boundary;
|
||
u_int32_t adj_size, max_end;
|
||
struct dos_partition *partp;
|
||
|
||
while (1) {
|
||
part_processed = 1;
|
||
if (command->n_args != 4) {
|
||
warnx("ERROR line %d: incorrect number of partition args",
|
||
current_line_number);
|
||
break;
|
||
}
|
||
partition = command->args[0].arg_val;
|
||
if (partition < 1 || partition > 4) {
|
||
warnx("ERROR line %d: invalid partition number %d",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
partp = ((struct dos_partition *) &mboot.parts) + partition - 1;
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
partp->dp_typ = command->args[1].arg_val;
|
||
partp->dp_start = command->args[2].arg_val;
|
||
partp->dp_size = command->args[3].arg_val;
|
||
max_end = partp->dp_start + partp->dp_size;
|
||
|
||
if (partp->dp_typ == 0) {
|
||
/*
|
||
* Get out, the partition is marked as unused.
|
||
*/
|
||
/*
|
||
* Insure that it's unused.
|
||
*/
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
status = 1;
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* Adjust start upwards, if necessary, to fall on a head boundary.
|
||
*/
|
||
if (partp->dp_start % dos_sectors != 0) {
|
||
prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors;
|
||
if (max_end < dos_sectors ||
|
||
prev_head_boundary > max_end - dos_sectors) {
|
||
/*
|
||
* Can't go past end of partition
|
||
*/
|
||
warnx(
|
||
"ERROR line %d: unable to adjust start of partition %d to fall on\n\
|
||
a head boundary",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
warnx(
|
||
"WARNING: adjusting start offset of partition %d\n\
|
||
from %u to %u, to fall on a head boundary",
|
||
partition, (u_int)partp->dp_start,
|
||
(u_int)(prev_head_boundary + dos_sectors));
|
||
partp->dp_start = prev_head_boundary + dos_sectors;
|
||
}
|
||
|
||
/*
|
||
* Adjust size downwards, if necessary, to fall on a cylinder
|
||
* boundary.
|
||
*/
|
||
prev_cyl_boundary =
|
||
((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs;
|
||
if (prev_cyl_boundary > partp->dp_start)
|
||
adj_size = prev_cyl_boundary - partp->dp_start;
|
||
else {
|
||
warnx(
|
||
"ERROR: could not adjust partition to start on a head boundary\n\
|
||
and end on a cylinder boundary.");
|
||
return (0);
|
||
}
|
||
if (adj_size != partp->dp_size) {
|
||
warnx(
|
||
"WARNING: adjusting size of partition %d from %u to %u\n\
|
||
to end on a cylinder boundary",
|
||
partition, (u_int)partp->dp_size, (u_int)adj_size);
|
||
partp->dp_size = adj_size;
|
||
}
|
||
if (partp->dp_size == 0) {
|
||
warnx("ERROR line %d: size of partition %d is zero",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
|
||
dos(partp);
|
||
status = 1;
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
process_active(CMD *command)
|
||
{
|
||
int status = 0, partition, i;
|
||
struct dos_partition *partp;
|
||
|
||
while (1) {
|
||
active_processed = 1;
|
||
if (command->n_args != 1) {
|
||
warnx("ERROR line %d: incorrect number of active args",
|
||
current_line_number);
|
||
status = 0;
|
||
break;
|
||
}
|
||
partition = command->args[0].arg_val;
|
||
if (partition < 1 || partition > 4) {
|
||
warnx("ERROR line %d: invalid partition number %d",
|
||
current_line_number, partition);
|
||
break;
|
||
}
|
||
/*
|
||
* Reset active partition
|
||
*/
|
||
partp = ((struct dos_partition *) &mboot.parts);
|
||
for (i = 0; i < NDOSPART; i++)
|
||
partp[i].dp_flag = 0;
|
||
partp[partition-1].dp_flag = ACTIVE;
|
||
|
||
status = 1;
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
process_line(char *line)
|
||
{
|
||
CMD command;
|
||
int status = 1;
|
||
|
||
while (1) {
|
||
parse_config_line(line, &command);
|
||
switch (command.cmd) {
|
||
case 0:
|
||
/*
|
||
* Comment or blank line
|
||
*/
|
||
break;
|
||
case 'g':
|
||
/*
|
||
* Set geometry
|
||
*/
|
||
status = process_geometry(&command);
|
||
break;
|
||
case 'p':
|
||
status = process_partition(&command);
|
||
break;
|
||
case 'a':
|
||
status = process_active(&command);
|
||
break;
|
||
default:
|
||
status = 0;
|
||
break;
|
||
}
|
||
break;
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static int
|
||
read_config(char *config_file)
|
||
{
|
||
FILE *fp = NULL;
|
||
int status = 1;
|
||
char buf[1010];
|
||
|
||
while (1) {
|
||
if (strcmp(config_file, "-") != 0) {
|
||
/*
|
||
* We're not reading from stdin
|
||
*/
|
||
if ((fp = fopen(config_file, "r")) == NULL) {
|
||
status = 0;
|
||
break;
|
||
}
|
||
} else {
|
||
fp = stdin;
|
||
}
|
||
current_line_number = 0;
|
||
while (!feof(fp)) {
|
||
if (fgets(buf, sizeof(buf), fp) == NULL)
|
||
break;
|
||
++current_line_number;
|
||
status = process_line(buf);
|
||
if (status == 0)
|
||
break;
|
||
}
|
||
break;
|
||
}
|
||
if (fp) {
|
||
/*
|
||
* It doesn't matter if we're reading from stdin, as we've reached EOF
|
||
*/
|
||
fclose(fp);
|
||
}
|
||
return (status);
|
||
}
|
||
|
||
|
||
static void
|
||
reset_boot(void)
|
||
{
|
||
int i;
|
||
struct dos_partition *partp;
|
||
|
||
init_boot();
|
||
for (i = 0; i < 4; ++i) {
|
||
partp = ((struct dos_partition *) &mboot.parts) + i;
|
||
bzero((char *)partp, sizeof (struct dos_partition));
|
||
}
|
||
}
|
||
|
||
static int
|
||
sanitize_partition(struct dos_partition *partp)
|
||
{
|
||
u_int32_t prev_head_boundary, prev_cyl_boundary;
|
||
u_int32_t max_end, size, start;
|
||
|
||
start = partp->dp_start;
|
||
size = partp->dp_size;
|
||
max_end = start + size;
|
||
/* Only allow a zero size if the partition is being marked unused. */
|
||
if (size == 0) {
|
||
if (start == 0 && partp->dp_typ == 0)
|
||
return (1);
|
||
warnx("ERROR: size of partition is zero");
|
||
return (0);
|
||
}
|
||
/* Return if no adjustment is necessary. */
|
||
if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
|
||
return (1);
|
||
|
||
if (start == 0) {
|
||
warnx("WARNING: partition overlaps with partition table");
|
||
if (ok("Correct this automatically?"))
|
||
start = dos_sectors;
|
||
}
|
||
if (start % dos_sectors != 0)
|
||
warnx("WARNING: partition does not start on a head boundary");
|
||
if ((start +size) % dos_sectors != 0)
|
||
warnx("WARNING: partition does not end on a cylinder boundary");
|
||
warnx("WARNING: this may confuse the BIOS or some operating systems");
|
||
if (!ok("Correct this automatically?"))
|
||
return (1);
|
||
|
||
/*
|
||
* Adjust start upwards, if necessary, to fall on a head boundary.
|
||
*/
|
||
if (start % dos_sectors != 0) {
|
||
prev_head_boundary = start / dos_sectors * dos_sectors;
|
||
if (max_end < dos_sectors ||
|
||
prev_head_boundary >= max_end - dos_sectors) {
|
||
/*
|
||
* Can't go past end of partition
|
||
*/
|
||
warnx(
|
||
"ERROR: unable to adjust start of partition to fall on a head boundary");
|
||
return (0);
|
||
}
|
||
start = prev_head_boundary + dos_sectors;
|
||
}
|
||
|
||
/*
|
||
* Adjust size downwards, if necessary, to fall on a cylinder
|
||
* boundary.
|
||
*/
|
||
prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs;
|
||
if (prev_cyl_boundary > start)
|
||
size = prev_cyl_boundary - start;
|
||
else {
|
||
warnx("ERROR: could not adjust partition to start on a head boundary\n\
|
||
and end on a cylinder boundary.");
|
||
return (0);
|
||
}
|
||
|
||
/* Finally, commit any changes to partp and return. */
|
||
if (start != partp->dp_start) {
|
||
warnx("WARNING: adjusting start offset of partition to %u",
|
||
(u_int)start);
|
||
partp->dp_start = start;
|
||
}
|
||
if (size != partp->dp_size) {
|
||
warnx("WARNING: adjusting size of partition to %u", (u_int)size);
|
||
partp->dp_size = size;
|
||
}
|
||
|
||
return (1);
|
||
}
|
||
|
||
/*
|
||
* Try figuring out the root device's canonical disk name.
|
||
* The following choices are considered:
|
||
* /dev/ad0s1a => /dev/ad0
|
||
* /dev/da0a => /dev/da0
|
||
* /dev/vinum/root => /dev/vinum/root
|
||
*/
|
||
static char *
|
||
get_rootdisk(void)
|
||
{
|
||
struct statfs rootfs;
|
||
regex_t re;
|
||
#define NMATCHES 2
|
||
regmatch_t rm[NMATCHES];
|
||
char *s;
|
||
int rv;
|
||
|
||
if (statfs("/", &rootfs) == -1)
|
||
err(1, "statfs(\"/\")");
|
||
|
||
if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$",
|
||
REG_EXTENDED)) != 0)
|
||
errx(1, "regcomp() failed (%d)", rv);
|
||
if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0)
|
||
errx(1,
|
||
"mounted root fs resource doesn't match expectations (regexec returned %d)",
|
||
rv);
|
||
if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
|
||
errx(1, "out of memory");
|
||
memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
|
||
rm[1].rm_eo - rm[1].rm_so);
|
||
s[rm[1].rm_eo - rm[1].rm_so] = 0;
|
||
|
||
return s;
|
||
}
|