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
|
/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "filter.h"
#include "activate.h" /* device_is_usable */
#ifdef UDEV_SYNC_SUPPORT
#include <libudev.h>
#include "dev-ext-udev-constants.h"
#endif
static const char *_too_small_to_hold_pv_msg = "Too small to hold a PV";
static int _native_check_pv_min_size(struct device *dev)
{
uint64_t size;
int ret = 0;
/* Check it's accessible */
if (!dev_open_readonly_quiet(dev)) {
log_debug_devs("%s: Skipping: open failed [%s:%p]",
dev_name(dev), dev_ext_name(dev), dev->ext.handle);
return 0;
}
/* Check it's not too small */
if (!dev_get_size(dev, &size)) {
log_debug_devs("%s: Skipping: dev_get_size failed [%s:%p]",
dev_name(dev), dev_ext_name(dev), dev->ext.handle);
goto out;
}
if (size < pv_min_size()) {
log_debug_devs("%s: Skipping: %s [%s:%p]", dev_name(dev),
_too_small_to_hold_pv_msg,
dev_ext_name(dev), dev->ext.handle);
goto out;
}
ret = 1;
out:
if (!dev_close(dev))
stack;
return ret;
}
#ifdef UDEV_SYNC_SUPPORT
static int _udev_check_pv_min_size(struct device *dev)
{
struct dev_ext *ext;
const char *size_str;
char *endp;
uint64_t size;
if (!(ext = dev_ext_get(dev)))
return_0;
if (!(size_str = udev_device_get_sysattr_value((struct udev_device *)ext->handle, DEV_EXT_UDEV_SYSFS_ATTR_SIZE))) {
log_debug_devs("%s: Skipping: failed to get size from sysfs [%s:%p]",
dev_name(dev), dev_ext_name(dev), dev->ext.handle);
return 0;
}
errno = 0;
size = strtoull(size_str, &endp, 10);
if (errno || !endp || *endp) {
log_debug_devs("%s: Skipping: failed to parse size from sysfs [%s:%p]",
dev_name(dev), dev_ext_name(dev), dev->ext.handle);
return 0;
}
if (size < pv_min_size()) {
log_debug_devs("%s: Skipping: %s [%s:%p]", dev_name(dev),
_too_small_to_hold_pv_msg,
dev_ext_name(dev), dev->ext.handle);
return 0;
}
return 1;
}
#else
static int _udev_check_pv_min_size(struct device *dev)
{
return 1;
}
#endif
static int _check_pv_min_size(struct device *dev)
{
if (dev->ext.src == DEV_EXT_NONE)
return _native_check_pv_min_size(dev);
if (dev->ext.src == DEV_EXT_UDEV)
return _udev_check_pv_min_size(dev);
log_error(INTERNAL_ERROR "Missing hook for PV min size check "
"using external device info source %s", dev_ext_name(dev));
return 0;
}
static int _passes_usable_filter(struct dev_filter *f, struct device *dev)
{
filter_mode_t mode = *((filter_mode_t *) f->private);
struct dev_usable_check_params ucp = {0};
int r;
/* check if the device is not too small to hold a PV */
switch (mode) {
case FILTER_MODE_NO_LVMETAD:
/* fall through */
case FILTER_MODE_PRE_LVMETAD:
if (!_check_pv_min_size(dev))
return 0;
break;
case FILTER_MODE_POST_LVMETAD:
/* nothing to do here */
break;
}
/* further checks are done on dm devices only */
if (!dm_is_dm_major(MAJOR(dev->dev)))
return 1;
switch (mode) {
case FILTER_MODE_NO_LVMETAD:
ucp.check_empty = 1;
ucp.check_blocked = 1;
ucp.check_suspended = ignore_suspended_devices();
ucp.check_error_target = 1;
ucp.check_reserved = 1;
break;
case FILTER_MODE_PRE_LVMETAD:
ucp.check_empty = 1;
/*
* If we're scanning for lvmetad update,
* we don't want to hang on blocked/suspended devices.
* When the device is unblocked/resumed, surely,
* there's going to be a CHANGE event so the device
* gets scanned via udev rule anyway after resume.
*/
ucp.check_blocked = 1;
ucp.check_suspended = 1;
ucp.check_error_target = 1;
ucp.check_reserved = 1;
break;
case FILTER_MODE_POST_LVMETAD:
ucp.check_empty = 0;
ucp.check_blocked = 1;
ucp.check_suspended = ignore_suspended_devices();
ucp.check_error_target = 0;
ucp.check_reserved = 0;
break;
}
if (!(r = device_is_usable(dev, ucp)))
log_debug_devs("%s: Skipping unusable device", dev_name(dev));
return r;
}
static void _usable_filter_destroy(struct dev_filter *f)
{
if (f->use_count)
log_error(INTERNAL_ERROR "Destroying usable device filter while in use %u times.", f->use_count);
dm_free(f->private);
dm_free(f);
}
struct dev_filter *usable_filter_create(struct dev_types *dt __attribute__((unused)), filter_mode_t mode)
{
struct dev_filter *f;
if (!(f = dm_zalloc(sizeof(struct dev_filter)))) {
log_error("Usable device filter allocation failed");
return NULL;
}
f->passes_filter = _passes_usable_filter;
f->destroy = _usable_filter_destroy;
f->use_count = 0;
if (!(f->private = dm_zalloc(sizeof(filter_mode_t)))) {
log_error("Usable device filter mode allocation failed");
dm_free(f);
return NULL;
}
*((filter_mode_t *) f->private) = mode;
log_debug_devs("Usable device filter initialised.");
return f;
}
|
