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/* $OpenBSD: disk.c,v 1.56 2018/04/26 15:55:14 guenther Exp $ */
/*
* Copyright (c) 1997 Tobias Weingartner
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/dkio.h>
#include <sys/stat.h>
#include <sys/disklabel.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <util.h>
#include "disk.h"
#include "misc.h"
struct disk disk;
struct disklabel dl;
void
DISK_open(int rw)
{
struct stat st;
u_int64_t sz, spc;
disk.fd = opendev(disk.name, rw ? O_RDWR : O_RDONLY, OPENDEV_PART,
NULL);
if (disk.fd == -1)
err(1, "%s", disk.name);
if (fstat(disk.fd, &st) == -1)
err(1, "%s", disk.name);
if (!S_ISCHR(st.st_mode))
errx(1, "%s is not a character device", disk.name);
/* Get label geometry. */
if (ioctl(disk.fd, DIOCGPDINFO, &dl) == -1) {
warn("DIOCGPDINFO");
} else {
unit_types[SECTORS].conversion = dl.d_secsize;
if (disk.size == 0) {
/* -l or -c/-h/-s not used. Use disklabel info. */
disk.cylinders = dl.d_ncylinders;
disk.heads = dl.d_ntracks;
disk.sectors = dl.d_nsectors;
/* MBR handles only first UINT32_MAX sectors. */
spc = (u_int64_t)disk.heads * disk.sectors;
sz = DL_GETDSIZE(&dl);
if (sz > UINT32_MAX) {
disk.cylinders = UINT32_MAX / spc;
disk.size = disk.cylinders * spc;
} else
disk.size = sz;
}
}
if (disk.size == 0 || disk.cylinders == 0 || disk.heads == 0 ||
disk.sectors == 0 || unit_types[SECTORS].conversion == 0)
errx(1, "Can't get disk geometry, please use [-chs] or [-l]"
"to specify.");
}
/*
* Print the disk geometry information. Take an optional modifier
* to indicate the units that should be used for display.
*/
int
DISK_printgeometry(char *units)
{
const int secsize = unit_types[SECTORS].conversion;
double size;
int i;
i = unit_lookup(units);
size = ((double)disk.size * secsize) / unit_types[i].conversion;
printf("Disk: %s\t", disk.name);
if (disk.size) {
printf("geometry: %d/%d/%d [%.0f ", disk.cylinders,
disk.heads, disk.sectors, size);
if (i == SECTORS && secsize != sizeof(struct dos_mbr))
printf("%d-byte ", secsize);
printf("%s]\n", unit_types[i].lname);
} else
printf("geometry: <none>\n");
return (0);
}
/*
* Read the sector at 'where' from the file descriptor 'fd' into newly
* calloc'd memory. Return a pointer to the memory if it contains the
* requested data, or NULL if it does not.
*
* The caller must free() the memory it gets.
*/
char *
DISK_readsector(off_t where)
{
int secsize;
char *secbuf;
ssize_t len;
off_t off;
secsize = dl.d_secsize;
where *= secsize;
off = lseek(disk.fd, where, SEEK_SET);
if (off != where)
return (NULL);
secbuf = calloc(1, secsize);
if (secbuf == NULL)
return (NULL);
len = read(disk.fd, secbuf, secsize);
if (len == -1 || len != secsize) {
free(secbuf);
return (NULL);
}
return (secbuf);
}
/*
* Write the sector-sized 'secbuf' to the sector 'where' on the file
* descriptor 'fd'. Return 0 if the write works. Return -1 and set
* errno if the write fails.
*/
int
DISK_writesector(char *secbuf, off_t where)
{
int secsize;
ssize_t len;
off_t off;
len = -1;
secsize = dl.d_secsize;
where *= secsize;
off = lseek(disk.fd, where, SEEK_SET);
if (off == where)
len = write(disk.fd, secbuf, secsize);
if (len == -1 || len != secsize) {
/* short read or write */
errno = EIO;
return (-1);
}
return (0);
}
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