1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*
* Copyright (C) 2012 Davidlohr Bueso <dave@gnu.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_LIBBLKID
#include <blkid.h>
#endif
#include "nls.h"
#include "blkdev.h"
#include "common.h"
#include "fdisk.h"
int fdisk_debug_mask;
static unsigned long __get_sector_size(int fd)
{
int sect_sz;
if (!blkdev_get_sector_size(fd, §_sz))
return (unsigned long) sect_sz;
return DEFAULT_SECTOR_SIZE;
}
static int __discover_geometry(struct fdisk_context *cxt)
{
sector_t nsects;
/* get number of 512-byte sectors, and convert it the real sectors */
if (!blkdev_get_sectors(cxt->dev_fd, &nsects))
cxt->total_sectors = (nsects / (cxt->sector_size >> 9));
return 0;
}
static int __discover_topology(struct fdisk_context *cxt)
{
#ifdef HAVE_LIBBLKID
blkid_probe pr;
pr = blkid_new_probe();
if (pr && blkid_probe_set_device(pr, cxt->dev_fd, 0, 0) == 0) {
blkid_topology tp = blkid_probe_get_topology(pr);
if (tp) {
cxt->min_io_size = blkid_topology_get_minimum_io_size(tp);
cxt->optimal_io_size = blkid_topology_get_optimal_io_size(tp);
cxt->phy_sector_size = blkid_topology_get_physical_sector_size(tp);
cxt->alignment_offset = blkid_topology_get_alignment_offset(tp);
/* I/O size used by fdisk */
cxt->io_size = cxt->optimal_io_size;
if (!cxt->io_size)
/* optimal IO is optional, default to minimum IO */
cxt->io_size = cxt->min_io_size;
}
}
blkid_free_probe(pr);
#endif
/* no blkid or error, use default values */
if (!cxt->min_io_size)
cxt->min_io_size = DEFAULT_SECTOR_SIZE;
if (!cxt->io_size)
cxt->io_size = DEFAULT_SECTOR_SIZE;
cxt->sector_size = __get_sector_size(cxt->dev_fd);
if (!cxt->phy_sector_size) /* could not discover physical size */
cxt->phy_sector_size = cxt->sector_size;
DBG(TOPOLOGY, dbgprint("topology discovered for %s:\n"
"\tlogical/physical sector sizes: %ld/%ld\n"
"\tfdisk/minimal/optimal io sizes: %ld/%ld/%ld\n",
cxt->dev_path, cxt->sector_size, cxt->phy_sector_size,
cxt->io_size, cxt->optimal_io_size, cxt->min_io_size));
return 0;
}
/**
* fdisk_dev_sectsz_is_default:
* @cxt: fdisk context
*
* Returns 1 if the device's sector size is the default value, otherwise 0.
*/
int fdisk_dev_sectsz_is_default(struct fdisk_context *cxt)
{
return cxt->sector_size == DEFAULT_SECTOR_SIZE;
}
/**
* fdisk_dev_has_topology:
* @cxt: fdisk context
*
* Returns 1 if the device provides topology information, otherwise 0.
*/
int fdisk_dev_has_topology(struct fdisk_context *cxt)
{
/*
* Assume that the device provides topology info if
* optimal_io_size is set or alignment_offset is set or
* minimum_io_size is not power of 2.
*/
if (cxt->optimal_io_size || cxt->alignment_offset ||
!is_power_of_2(cxt->min_io_size))
return 1;
return 0;
}
/**
* fdisk_init_debug:
* @mask: debug mask (0xffff to enable full debuging)
*
* If the @mask is not specified then this function reads
* FDISK_DEBUG environment variable to get the mask.
*
* Already initialized debugging stuff cannot be changed. It does not
* have effect to call this function twice.
*/
void fdisk_init_debug(int mask)
{
if (fdisk_debug_mask & FDISK_DEBUG_INIT)
return;
if (!mask) {
char *str = getenv("FDISK_DEBUG");
if (str)
fdisk_debug_mask = strtoul(str, 0, 0);
} else
fdisk_debug_mask = mask;
if (fdisk_debug_mask)
fprintf(stderr, "fdisk: debug mask set to 0x%04x.\n",
fdisk_debug_mask);
fdisk_debug_mask |= FDISK_DEBUG_INIT;
}
/**
* fdisk_new_context:
* @filename: path to the device to be handled
* @readonly: how to open the device
*
* If the @readonly flag is set to false, fdisk will attempt to open
* the device with read-write mode and will fallback to read-only if
* unsuccessful.
*
* Returns: newly allocated fdisk context
*/
struct fdisk_context *fdisk_new_context_from_filename(const char *fname, int readonly)
{
int fd, errsv = 0;
struct fdisk_context *cxt = NULL;
if (readonly == 1 || (fd = open(fname, O_RDWR)) < 0) {
if ((fd = open(fname, O_RDONLY)) < 0)
return NULL;
readonly = 1;
}
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
goto fail;
cxt->dev_fd = fd;
cxt->dev_path = strdup(fname);
if (!cxt->dev_path)
goto fail;
__discover_topology(cxt);
__discover_geometry(cxt);
DBG(CONTEXT, dbgprint("context initialized for %s [%s]",
fname, readonly ? "READ-ONLY" : "READ-WRITE"));
return cxt;
fail:
errsv = errno;
fdisk_free_context(cxt);
errno = errsv;
DBG(CONTEXT, dbgprint("failed to initialize context for %s: %m", fname));
return NULL;
}
/**
* fdisk_free_context:
* @cxt: fdisk context
*
* Deallocates context struct.
*/
void fdisk_free_context(struct fdisk_context *cxt)
{
if (!cxt)
return;
DBG(CONTEXT, dbgprint("freeing context for %s", cxt->dev_path));
close(cxt->dev_fd);
free(cxt->dev_path);
free(cxt);
}
|
