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
|
/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 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 "locking.h"
#include "locking_types.h"
#include "lvm-string.h"
#include "activate.h"
#include <signal.h>
/*
* No locking
*/
static void _no_fin_locking(void)
{
}
static void _no_reset_locking(void)
{
}
static int _no_lock_resource(struct cmd_context *cmd, const char *resource,
uint32_t flags)
{
switch (flags & LCK_SCOPE_MASK) {
case LCK_VG:
if (!strcmp(resource, VG_SYNC_NAMES))
fs_unlock();
break;
case LCK_LV:
switch (flags & LCK_TYPE_MASK) {
case LCK_NULL:
return lv_deactivate(cmd, resource);
case LCK_UNLOCK:
return lv_resume_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1: 0, 0, (flags & LCK_REVERT) ? 1 : 0);
case LCK_READ:
return lv_activate_with_filter(cmd, resource, 0);
case LCK_WRITE:
return lv_suspend_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1 : 0, 0);
case LCK_EXCL:
return lv_activate_with_filter(cmd, resource, 1);
default:
break;
}
break;
default:
log_error("Unrecognised lock scope: %d",
flags & LCK_SCOPE_MASK);
return 0;
}
return 1;
}
static int _readonly_lock_resource(struct cmd_context *cmd,
const char *resource,
uint32_t flags)
{
if ((flags & LCK_TYPE_MASK) == LCK_WRITE &&
(flags & LCK_SCOPE_MASK) == LCK_VG &&
!(flags & LCK_CACHE) &&
strcmp(resource, VG_GLOBAL)) {
log_error("Read-only locking type set. "
"Write locks are prohibited.");
return 0;
}
return _no_lock_resource(cmd, resource, flags);
}
int init_no_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)),
int suppress_messages)
{
locking->lock_resource = _no_lock_resource;
locking->reset_locking = _no_reset_locking;
locking->fin_locking = _no_fin_locking;
locking->flags = LCK_CLUSTERED;
return 1;
}
int init_readonly_locking(struct locking_type *locking, struct cmd_context *cmd __attribute__((unused)),
int suppress_messages)
{
locking->lock_resource = _readonly_lock_resource;
locking->reset_locking = _no_reset_locking;
locking->fin_locking = _no_fin_locking;
locking->flags = 0;
return 1;
}
|
