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/* $OpenBSD: disk.c,v 1.22 2004/08/03 09:23:11 deraadt Exp $ */
/*
* Copyright (c) 1997, 2001 Tobias Weingartner
* 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 ``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 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.
*/
#include <err.h>
#include <util.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/reboot.h>
#include <sys/disklabel.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#ifdef CPU_BIOS
#include <machine/biosvar.h>
#endif
#include "disk.h"
#include "misc.h"
DISK_metrics *DISK_getlabelmetrics(char *name);
DISK_metrics *DISK_getbiosmetrics(char *name);
int
DISK_open(char *disk, int mode)
{
int fd;
struct stat st;
fd = opendev(disk, mode, OPENDEV_PART, NULL);
if (fd == -1)
err(1, "%s", disk);
if (fstat(fd, &st) == -1)
err(1, "%s", disk);
if (!S_ISCHR(st.st_mode) && !S_ISREG(st.st_mode))
err(1, "%s is not a character device or a regular file", disk);
return (fd);
}
int
DISK_close(int fd)
{
return (close(fd));
}
/* Routine to go after the disklabel for geometry
* information. This should work everywhere, but
* in the land of PC, things are not always what
* they seem.
*/
DISK_metrics *
DISK_getlabelmetrics(char *name)
{
DISK_metrics *lm = NULL;
struct disklabel dl;
int fd;
/* Get label metrics */
if ((fd = DISK_open(name, O_RDONLY)) != -1) {
lm = malloc(sizeof(DISK_metrics));
if (lm == NULL)
err(1, NULL);
if (ioctl(fd, DIOCGDINFO, &dl) == -1) {
warn("DIOCGDINFO");
free(lm);
lm = NULL;
} else {
lm->cylinders = dl.d_ncylinders;
lm->heads = dl.d_ntracks;
lm->sectors = dl.d_nsectors;
lm->size = dl.d_secperunit;
}
DISK_close(fd);
}
return (lm);
}
#ifdef CPU_BIOS
/*
* Routine to go after sysctl info for BIOS
* geometry. This should only really work on PC
* type machines. There is still a problem with
* correlating the BIOS drive to the BSD drive.
*/
DISK_metrics *
DISK_getbiosmetrics(char *name)
{
bios_diskinfo_t di;
DISK_metrics *bm;
struct stat st;
int mib[4], fd;
size_t size;
dev_t devno;
if ((fd = DISK_open(name, O_RDONLY)) == -1)
return (NULL);
fstat(fd, &st);
DISK_close(fd);
/* Get BIOS metrics */
mib[0] = CTL_MACHDEP;
mib[1] = CPU_CHR2BLK;
mib[2] = st.st_rdev;
size = sizeof(devno);
if (sysctl(mib, 3, &devno, &size, NULL, 0) == -1) {
warn("sysctl(machdep.chr2blk)");
return (NULL);
}
devno = MAKEBOOTDEV(major(devno), 0, 0, DISKUNIT(devno), RAW_PART);
mib[0] = CTL_MACHDEP;
mib[1] = CPU_BIOS;
mib[2] = BIOS_DISKINFO;
mib[3] = devno;
size = sizeof(di);
if (sysctl(mib, 4, &di, &size, NULL, 0) == -1) {
warn("sysctl(machdep.bios.diskinfo)");
return (NULL);
}
bm = malloc(sizeof(di));
if (bm == NULL)
err(1, NULL);
bm->cylinders = di.bios_cylinders;
bm->heads = di.bios_heads;
bm->sectors = di.bios_sectors;
bm->size = di.bios_cylinders * di.bios_heads * di.bios_sectors;
return (bm);
}
#else
/*
* We are not a PC, so we do not have BIOS metrics to contend
* with. Return NULL to indicate so.
*/
DISK_metrics *
DISK_getbiosmetrics(char *name)
{
return (NULL);
}
#endif
/* This is ugly, and convoluted. All the magic
* for disk geo/size happens here. Basically,
* the real size is the one we will use in the
* rest of the program, the label size is what we
* got from the disklabel. If the disklabel fails,
* we assume we are working with a normal file,
* and should request the user to specify the
* geometry he/she wishes to use.
*/
int
DISK_getmetrics(disk_t *disk, DISK_metrics *user)
{
disk->label = DISK_getlabelmetrics(disk->name);
disk->bios = DISK_getbiosmetrics(disk->name);
/* If user supplied, use that */
if (user) {
disk->real = user;
return (0);
}
/* Fixup bios metrics to include cylinders past 1023 boundary */
if(disk->label && disk->bios){
int cyls, secs;
cyls = disk->label->size / (disk->bios->heads * disk->bios->sectors);
secs = cyls * (disk->bios->heads * disk->bios->sectors);
if ((disk->label->size - secs) < 0)
errx(1, "BIOS fixup botch (%d sectors)",
disk->label->size - secs);
disk->bios->cylinders = cyls;
disk->bios->size = secs;
}
/* If we have a (fixed) BIOS geometry, use that */
if (disk->bios) {
disk->real = disk->bios;
return (0);
}
/* If we have a label, use that */
if (disk->label) {
disk->real = disk->label;
return (0);
}
/* Can not get geometry, punt */
disk->real = NULL;
return (1);
}
/*
* Print the disk geometry information. Take an optional modifier
* to indicate the units that should be used for display.
*/
int
DISK_printmetrics(disk_t *disk, char *units)
{
int i;
double size;
i = unit_lookup(units);
size = (double)disk->real->size * DEV_BSIZE / unit_types[i].conversion;
printf("Disk: %s\t", disk->name);
if (disk->real)
printf("geometry: %d/%d/%d [%.0f %s]\n", disk->real->cylinders,
disk->real->heads, disk->real->sectors, size,
unit_types[i].lname);
else
printf("geometry: <none>\n");
return (0);
}
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