include/linux/task_io_accounting_ops.h


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

/*
 * Task I/O accounting operations
 */
#ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
#define __TASK_IO_ACCOUNTING_OPS_INCLUDED

#include <linux/sched.h>

#ifdef CONFIG_TASK_IO_ACCOUNTING
static inline void task_io_account_read(size_t bytes)
{
	current->ioac.read_bytes += bytes;
}

/*
 * We approximate number of blocks, because we account bytes only.
 * A 'block' is 512 bytes
 */
static inline unsigned long task_io_get_inblock(const struct task_struct *p)
{
	return p->ioac.read_bytes >> 9;
}

static inline void task_io_account_write(size_t bytes)
{
	current->ioac.write_bytes += bytes;
}

/*
 * We approximate number of blocks, because we account bytes only.
 * A 'block' is 512 bytes
 */
static inline unsigned long task_io_get_oublock(const struct task_struct *p)
{
	return p->ioac.write_bytes >> 9;
}

static inline void task_io_account_cancelled_write(size_t bytes)
{
	current->ioac.cancelled_write_bytes += bytes;
}

static inline void task_io_accounting_init(struct task_struct *tsk)
{
	memset(&tsk->ioac, 0, sizeof(tsk->ioac));
}

#else

static inline void task_io_account_read(size_t bytes)
{
}

static inline unsigned long task_io_get_inblock(const struct task_struct *p)
{
	return 0;
}

static inline void task_io_account_write(size_t bytes)
{
}

static inline unsigned long task_io_get_oublock(const struct task_struct *p)
{
	return 0;
}

static inline void task_io_account_cancelled_write(size_t bytes)
{
}

static inline void task_io_accounting_init(struct task_struct *tsk)
{
}

#endif		/* CONFIG_TASK_IO_ACCOUNTING */
#endif		/* __TASK_IO_ACCOUNTING_OPS_INCLUDED */