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
|
/*
* Copyright (C) 2005-2016 Junjiro R. Okajima
*/
/*
* workqueue for asynchronous/super-io operations
* todo: try new credentials management scheme
*/
#ifndef __AUFS_WKQ_H__
#define __AUFS_WKQ_H__
#ifdef __KERNEL__
#include <linux/percpu_counter.h>
struct super_block;
/* ---------------------------------------------------------------------- */
/*
* in the next operation, wait for the 'nowait' tasks in system-wide workqueue
*/
struct au_nowait_tasks {
atomic_t nw_len;
wait_queue_head_t nw_wq;
};
/* ---------------------------------------------------------------------- */
typedef void (*au_wkq_func_t)(void *args);
/* wkq flags */
#define AuWkq_WAIT 1
#define AuWkq_NEST (1 << 1)
#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
#define au_fset_wkq(flags, name) \
do { (flags) |= AuWkq_##name; } while (0)
#define au_fclr_wkq(flags, name) \
do { (flags) &= ~AuWkq_##name; } while (0)
#ifndef CONFIG_AUFS_HNOTIFY
#undef AuWkq_NEST
#define AuWkq_NEST 0
#endif
/* wkq.c */
int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args);
int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
unsigned int flags);
void au_nwt_init(struct au_nowait_tasks *nwt);
int __init au_wkq_init(void);
void au_wkq_fin(void);
/* ---------------------------------------------------------------------- */
static inline int au_wkq_test(void)
{
return current->flags & PF_WQ_WORKER;
}
static inline int au_wkq_wait(au_wkq_func_t func, void *args)
{
return au_wkq_do_wait(AuWkq_WAIT, func, args);
}
static inline void au_nwt_done(struct au_nowait_tasks *nwt)
{
if (atomic_dec_and_test(&nwt->nw_len))
wake_up_all(&nwt->nw_wq);
}
static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
{
wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
return 0;
}
#endif /* __KERNEL__ */
#endif /* __AUFS_WKQ_H__ */
|
