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/* $OpenBSD: disk.c,v 1.75 2022/04/25 17:10:09 krw 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/param.h> /* DEV_BSIZE */
#include <sys/ioctl.h>
#include <sys/dkio.h>
#include <sys/stat.h>
#include <sys/disklabel.h>
#include <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include "part.h"
#include "disk.h"
#include "misc.h"
struct disk disk;
struct disklabel dl;
char *readsectors(const uint64_t, const uint32_t);
int writesectors(const void *, const uint64_t, const uint32_t);
void
DISK_open(const char *name, const int oflags)
{
struct stat st;
uint64_t ns, bs, sz, spc;
disk.dk_name = strdup(name);
if (disk.dk_name == NULL)
err(1, "dk_name");
disk.dk_fd = opendev(disk.dk_name, oflags, OPENDEV_PART, NULL);
if (disk.dk_fd == -1)
err(1, "opendev('%s', 0x%x)", disk.dk_name, oflags);
if (fstat(disk.dk_fd, &st) == -1)
err(1, "fstat('%s)", disk.dk_name);
if (!S_ISCHR(st.st_mode))
errx(1, "%s is not a character device", disk.dk_name);
if (ioctl(disk.dk_fd, DIOCGPDINFO, &dl) == -1)
err(1, "DIOCGPDINFO");
/* Set geometry to use in MBR partitions. */
if (disk.dk_size > 0) {
/* -l has set disk size. */
sz = disk.dk_size;
disk.dk_heads = 1;
disk.dk_sectors = 64;
disk.dk_size = DL_BLKTOSEC(&dl, sz);
disk.dk_cylinders = disk.dk_size / disk.dk_sectors;
} else if (disk.dk_cylinders > 0) {
/* -c/-h/-s has set disk geometry & therefore size. */
sz = disk.dk_cylinders * disk.dk_heads * disk.dk_sectors;
disk.dk_size = DL_BLKTOSEC(&dl, sz);
disk.dk_sectors = DL_BLKTOSEC(&dl, disk.dk_sectors);
} else {
disk.dk_cylinders = dl.d_ncylinders;
disk.dk_heads = dl.d_ntracks;
disk.dk_sectors = dl.d_nsectors;
/* MBR handles only first UINT32_MAX sectors. */
spc = (uint64_t)disk.dk_heads * disk.dk_sectors;
sz = DL_GETDSIZE(&dl);
if (sz > UINT32_MAX) {
disk.dk_cylinders = UINT32_MAX / spc;
disk.dk_size = disk.dk_cylinders * spc;
} else
disk.dk_size = sz;
}
if (disk.dk_size == 0)
errx(1, "disk size is 0");
if (disk.dk_bootprt.prt_ns > 0) {
ns = disk.dk_bootprt.prt_ns + DL_BLKSPERSEC(&dl) - 1;
bs = disk.dk_bootprt.prt_bs + DL_BLKSPERSEC(&dl) - 1;
disk.dk_bootprt.prt_ns = DL_BLKTOSEC(&dl, ns);
disk.dk_bootprt.prt_bs = DL_BLKTOSEC(&dl, bs);
}
}
void
DISK_printgeometry(const char *units)
{
const struct unit_type *ut;
const int secsize = dl.d_secsize;
double size;
size = units_size(units, disk.dk_size, &ut);
printf("Disk: %s\tgeometry: %d/%d/%d [%.0f ", disk.dk_name,
disk.dk_cylinders, disk.dk_heads, disk.dk_sectors, size);
if (ut->ut_conversion == 0 && secsize != DEV_BSIZE)
printf("%d-byte ", secsize);
printf("%s]\n", ut->ut_lname);
}
/*
* The caller must free() the returned memory!
*/
char *
readsectors(const uint64_t sector, const uint32_t count)
{
char *secbuf;
ssize_t len;
off_t off, where;
size_t bytes;
where = sector * dl.d_secsize;
bytes = count * dl.d_secsize;
off = lseek(disk.dk_fd, where, SEEK_SET);
if (off == -1) {
#ifdef DEBUG
warn("lseek(%lld) for read", (int64_t)where);
#endif
return NULL;
}
secbuf = calloc(1, bytes);
if (secbuf == NULL)
return NULL;
len = read(disk.dk_fd, secbuf, bytes);
if (len == -1) {
#ifdef DEBUG
warn("read(%zu @ %lld)", bytes, (int64_t)where);
#endif
free(secbuf);
return NULL;
}
if (len != (ssize_t)bytes) {
#ifdef DEBUG
warnx("short read(%zu @ %lld)", bytes, (int64_t)where);
#endif
free(secbuf);
return NULL;
}
return secbuf;
}
int
writesectors(const void *buf, const uint64_t sector, const uint32_t count)
{
ssize_t len;
off_t off, where;
size_t bytes;
where = sector * dl.d_secsize;
bytes = count * dl.d_secsize;
off = lseek(disk.dk_fd, where, SEEK_SET);
if (off == -1) {
#ifdef DEBUG
warn("lseek(%lld) for write", (int64_t)where);
#endif
return -1;
}
len = write(disk.dk_fd, buf, bytes);
if (len == -1) {
#ifdef DEBUG
warn("write(%zu @ %lld)", bytes, (int64_t)where);
#endif
return -1;
}
if (len != (ssize_t)bytes) {
#ifdef DEBUG
warnx("short write(%zu @ %lld)", bytes, (int64_t)where);
#endif
return -1;
}
return 0;
}
int
DISK_readbytes(void *buf, const uint64_t sector, const size_t sz)
{
char *secbuf;
uint32_t count;
count = (sz + dl.d_secsize - 1) / dl.d_secsize;
secbuf = readsectors(sector, count);
if (secbuf == NULL)
return -1;
memcpy(buf, secbuf, sz);
free(secbuf);
return 0;
}
int
DISK_writebytes(const void *buf, const uint64_t sector, const size_t sz)
{
char *secbuf;
uint32_t count;
int rslt;
count = (sz + dl.d_secsize - 1) / dl.d_secsize;
secbuf = readsectors(sector, count);
if (secbuf == NULL)
return -1;
memcpy(secbuf, buf, sz);
rslt = writesectors(secbuf, sector, count);
free(secbuf);
return rslt;
}
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