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/* $OpenBSD: disk.c,v 1.38 2014/03/14 15:41:33 krw 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 <sys/types.h>
#include <sys/fcntl.h>
#include <sys/dkio.h>
#include <sys/stdint.h>
#include <sys/stat.h>
#include <sys/disklabel.h>
#include <err.h>
#include <util.h>
#include <stdio.h>
#include <stdlib.h>
#include "disk.h"
#include "misc.h"
struct disklabel dl;
struct DISK_metrics *DISK_getlabelmetrics(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);
}
/* 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.
*/
struct DISK_metrics *
DISK_getlabelmetrics(char *name)
{
struct DISK_metrics *lm = NULL;
u_int64_t sz, spc;
int fd;
/* Get label metrics */
if ((fd = DISK_open(name, O_RDONLY)) != -1) {
lm = malloc(sizeof(struct DISK_metrics));
if (lm == NULL)
err(1, NULL);
if (ioctl(fd, DIOCGPDINFO, &dl) == -1) {
warn("DIOCGPDINFO");
free(lm);
lm = NULL;
} else {
lm->cylinders = dl.d_ncylinders;
lm->heads = dl.d_ntracks;
lm->sectors = dl.d_nsectors;
/* MBR handles only first UINT32_MAX sectors. */
spc = (u_int64_t)lm->heads * lm->sectors;
sz = DL_GETDSIZE(&dl);
if (sz > UINT32_MAX) {
lm->cylinders = UINT32_MAX / spc;
lm->size = lm->cylinders * spc;
warnx("disk too large (%llu sectors)."
" size truncated.", sz);
} else
lm->size = sz;
unit_types[SECTORS].conversion = dl.d_secsize;
}
close(fd);
}
return (lm);
}
/* 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(struct disk *disk, struct DISK_metrics *user)
{
disk->label = DISK_getlabelmetrics(disk->name);
/* If user supplied, use that */
if (user) {
disk->real = user;
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(struct disk *disk, char *units)
{
const int secsize = unit_types[SECTORS].conversion;
double size;
int i;
i = unit_lookup(units);
size = ((double)disk->real->size * secsize) / unit_types[i].conversion;
printf("Disk: %s\t", disk->name);
if (disk->real) {
printf("geometry: %d/%d/%d [%.0f ",
disk->real->cylinders, disk->real->heads,
disk->real->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);
}
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