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
|
/*
* Copyright (C) 2014 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser 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 "lib/misc/lib.h"
#include "lib/device/device.h"
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h>
#endif
struct ext_registry_item {
const char name[16];
struct dev_ext *(* dev_ext_get) (struct device *dev);
int (*dev_ext_release) (struct device *dev);
};
#define EXT_REGISTER(id,name) [id] = { #name, &_dev_ext_get_ ## name, &_dev_ext_release_ ## name }
/*
* DEV_EXT_NONE
*/
static struct dev_ext *_dev_ext_get_none(struct device *dev)
{
dev->ext.handle = NULL;
return &dev->ext;
}
static int _dev_ext_release_none(struct device *dev)
{
dev->ext.handle = NULL;
return 1;
}
/*
* DEV_EXT_UDEV
*/
static struct dev_ext *_dev_ext_get_udev(struct device *dev)
{
#ifdef UDEV_SYNC_SUPPORT
struct udev *udev;
struct udev_device *udev_device;
if (dev->ext.handle)
return &dev->ext;
if (!(udev = udev_get_library_context()))
return_NULL;
if (!(udev_device = udev_device_new_from_devnum(udev, 'b', dev->dev)))
return_NULL;
#ifdef HAVE_LIBUDEV_UDEV_DEVICE_GET_IS_INITIALIZED
if (!udev_device_get_is_initialized(udev_device)) {
/* Timeout or some other udev db inconsistency! */
log_error("Udev database has incomplete information about device %s.", dev_name(dev));
return NULL;
}
#endif
dev->ext.handle = (void *) udev_device;
return &dev->ext;
#else
return NULL;
#endif
}
static int _dev_ext_release_udev(struct device *dev)
{
#ifdef UDEV_SYNC_SUPPORT
if (!dev->ext.handle)
return 1;
/* udev_device_unref can't fail - it has no return value */
udev_device_unref((struct udev_device *) dev->ext.handle);
dev->ext.handle = NULL;
return 1;
#else
return 0;
#endif
}
static const struct ext_registry_item _ext_registry[DEV_EXT_NUM] = {
EXT_REGISTER(DEV_EXT_NONE, none),
EXT_REGISTER(DEV_EXT_UDEV, udev)
};
const char *dev_ext_name(struct device *dev)
{
return _ext_registry[dev->ext.src].name;
}
struct dev_ext *dev_ext_get(struct device *dev)
{
struct dev_ext *ext;
void *handle_ptr;
handle_ptr = dev->ext.handle;
if (!(ext = _ext_registry[dev->ext.src].dev_ext_get(dev)))
log_error("%s: Failed to get external handle [%s].",
dev_name(dev), dev_ext_name(dev));
else if (handle_ptr != dev->ext.handle)
log_debug_devs("%s: External handle [%s:%p] attached", dev_name(dev),
dev_ext_name(dev), dev->ext.handle);
return ext;
}
int dev_ext_release(struct device *dev)
{
int r;
void *handle_ptr;
if (!dev->ext.enabled ||
!dev->ext.handle)
return 1;
handle_ptr = dev->ext.handle;
if (!(r = _ext_registry[dev->ext.src].dev_ext_release(dev)))
log_error("%s: Failed to release external handle [%s:%p]",
dev_name(dev), dev_ext_name(dev), dev->ext.handle);
else
log_debug_devs("%s: External handle [%s:%p] detached",
dev_name(dev), dev_ext_name(dev), handle_ptr);
return r;
}
int dev_ext_enable(struct device *dev, dev_ext_t src)
{
if (dev->ext.enabled && (dev->ext.src != src) && !dev_ext_release(dev)) {
log_error("%s: Failed to enable external handle [%s].",
dev_name(dev), _ext_registry[src].name);
return 0;
}
dev->ext.src = src;
dev->ext.enabled = 1;
return 1;
}
int dev_ext_disable(struct device *dev)
{
if (!dev->ext.enabled)
return 1;
if (!dev_ext_release(dev)) {
log_error("%s: Failed to disable external handle [%s].",
dev_name(dev), dev_ext_name(dev));
return 0;
}
dev->ext.enabled = 0;
dev->ext.src = DEV_EXT_NONE;
return 1;
}
|
