GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/fdisk/disk.c Lines: 0 60 0.0 %
Date: 2017-11-07 Branches: 0 36 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: disk.c,v 1.55 2016/03/09 12:55:18 krw Exp $	*/
2
3
/*
4
 * Copyright (c) 1997 Tobias Weingartner
5
 *
6
 * Permission to use, copy, modify, and distribute this software for any
7
 * purpose with or without fee is hereby granted, provided that the above
8
 * copyright notice and this permission notice appear in all copies.
9
 *
10
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
 */
18
19
#include <sys/types.h>
20
#include <sys/fcntl.h>
21
#include <sys/ioctl.h>
22
#include <sys/dkio.h>
23
#include <sys/stat.h>
24
#include <sys/disklabel.h>
25
26
#include <err.h>
27
#include <errno.h>
28
#include <stdio.h>
29
#include <stdint.h>
30
#include <stdlib.h>
31
#include <unistd.h>
32
#include <util.h>
33
34
#include "disk.h"
35
#include "misc.h"
36
37
struct disk disk;
38
struct disklabel dl;
39
40
void
41
DISK_open(int rw)
42
{
43
	struct stat st;
44
	u_int64_t sz, spc;
45
46
	disk.fd = opendev(disk.name, rw ? O_RDWR : O_RDONLY, OPENDEV_PART,
47
	    NULL);
48
	if (disk.fd == -1)
49
		err(1, "%s", disk.name);
50
	if (fstat(disk.fd, &st) == -1)
51
		err(1, "%s", disk.name);
52
	if (!S_ISCHR(st.st_mode))
53
		errx(1, "%s is not a character device", disk.name);
54
55
	/* Get label geometry. */
56
	if (ioctl(disk.fd, DIOCGPDINFO, &dl) == -1) {
57
		warn("DIOCGPDINFO");
58
	} else {
59
		unit_types[SECTORS].conversion = dl.d_secsize;
60
		if (disk.size == 0) {
61
			/* -l or -c/-h/-s not used. Use disklabel info. */
62
			disk.cylinders = dl.d_ncylinders;
63
			disk.heads = dl.d_ntracks;
64
			disk.sectors = dl.d_nsectors;
65
			/* MBR handles only first UINT32_MAX sectors. */
66
			spc = (u_int64_t)disk.heads * disk.sectors;
67
			sz = DL_GETDSIZE(&dl);
68
			if (sz > UINT32_MAX) {
69
				disk.cylinders = UINT32_MAX / spc;
70
				disk.size = disk.cylinders * spc;
71
			} else
72
				disk.size = sz;
73
		}
74
	}
75
76
	if (disk.size == 0 || disk.cylinders == 0 || disk.heads == 0 ||
77
	    disk.sectors == 0 || unit_types[SECTORS].conversion == 0)
78
		errx(1, "Can't get disk geometry, please use [-chs] or [-l]"
79
		    "to specify.");
80
}
81
82
/*
83
 * Print the disk geometry information. Take an optional modifier
84
 * to indicate the units that should be used for display.
85
 */
86
int
87
DISK_printgeometry(char *units)
88
{
89
	const int secsize = unit_types[SECTORS].conversion;
90
	double size;
91
	int i;
92
93
	i = unit_lookup(units);
94
	size = ((double)disk.size * secsize) / unit_types[i].conversion;
95
	printf("Disk: %s\t", disk.name);
96
	if (disk.size) {
97
		printf("geometry: %d/%d/%d [%.0f ", disk.cylinders,
98
		    disk.heads, disk.sectors, size);
99
		if (i == SECTORS && secsize != sizeof(struct dos_mbr))
100
			printf("%d-byte ", secsize);
101
		printf("%s]\n", unit_types[i].lname);
102
	} else
103
		printf("geometry: <none>\n");
104
105
	return (0);
106
}
107
108
/*
109
 * Read the sector at 'where' from the file descriptor 'fd' into newly
110
 * calloc'd memory. Return a pointer to the memory if it contains the
111
 * requested data, or NULL if it does not.
112
 *
113
 * The caller must free() the memory it gets.
114
 */
115
char *
116
DISK_readsector(off_t where)
117
{
118
	int secsize;
119
	char *secbuf;
120
	ssize_t len;
121
	off_t off;
122
123
	secsize = dl.d_secsize;
124
125
	where *= secsize;
126
	off = lseek(disk.fd, where, SEEK_SET);
127
	if (off != where)
128
		return (NULL);
129
130
	secbuf = calloc(1, secsize);
131
	if (secbuf == NULL)
132
		return (NULL);
133
134
	len = read(disk.fd, secbuf, secsize);
135
	if (len == -1 || len != secsize) {
136
		free(secbuf);
137
		return (NULL);
138
	}
139
140
	return (secbuf);
141
}
142
143
/*
144
 * Write the sector-sized 'secbuf' to the sector 'where' on the file
145
 * descriptor 'fd'. Return 0 if the write works. Return -1 and set
146
 * errno if the write fails.
147
 */
148
int
149
DISK_writesector(char *secbuf, off_t where)
150
{
151
	int secsize;
152
	ssize_t len;
153
	off_t off;
154
155
	len = -1;
156
	secsize = dl.d_secsize;
157
158
	where *= secsize;
159
	off = lseek(disk.fd, where, SEEK_SET);
160
	if (off == where)
161
		len = write(disk.fd, secbuf, secsize);
162
163
	if (len == -1 || len != secsize) {
164
		/* short read or write */
165
		errno = EIO;
166
		return (-1);
167
	}
168
169
	return (0);
170
}