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
|
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*
* 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.
*
* This program is distributed in the hope that it would 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 the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_SUPPORT_MRLOCK_H__
#define __XFS_SUPPORT_MRLOCK_H__
#include <linux/rwsem.h>
typedef struct {
struct rw_semaphore mr_lock;
#ifdef DEBUG
int mr_writer;
#endif
} mrlock_t;
#ifdef DEBUG
#define mrinit(mrp, name) \
do { (mrp)->mr_writer = 0; init_rwsem(&(mrp)->mr_lock); } while (0)
#else
#define mrinit(mrp, name) \
do { init_rwsem(&(mrp)->mr_lock); } while (0)
#endif
#define mrlock_init(mrp, t,n,s) mrinit(mrp, n)
#define mrfree(mrp) do { } while (0)
static inline void mraccess_nested(mrlock_t *mrp, int subclass)
{
down_read_nested(&mrp->mr_lock, subclass);
}
static inline void mrupdate_nested(mrlock_t *mrp, int subclass)
{
down_write_nested(&mrp->mr_lock, subclass);
#ifdef DEBUG
mrp->mr_writer = 1;
#endif
}
static inline int mrtryaccess(mrlock_t *mrp)
{
return down_read_trylock(&mrp->mr_lock);
}
static inline int mrtryupdate(mrlock_t *mrp)
{
if (!down_write_trylock(&mrp->mr_lock))
return 0;
#ifdef DEBUG
mrp->mr_writer = 1;
#endif
return 1;
}
static inline void mrunlock_excl(mrlock_t *mrp)
{
#ifdef DEBUG
mrp->mr_writer = 0;
#endif
up_write(&mrp->mr_lock);
}
static inline void mrunlock_shared(mrlock_t *mrp)
{
up_read(&mrp->mr_lock);
}
static inline void mrdemote(mrlock_t *mrp)
{
#ifdef DEBUG
mrp->mr_writer = 0;
#endif
downgrade_write(&mrp->mr_lock);
}
#endif /* __XFS_SUPPORT_MRLOCK_H__ */
|
