1 /*
2  * Task I/O accounting operations
3  */
4 #ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
5 #define __TASK_IO_ACCOUNTING_OPS_INCLUDED
6 
7 #include <linux/sched.h>
8 
9 #ifdef CONFIG_TASK_IO_ACCOUNTING
10 static inline void task_io_account_read(size_t bytes)
11 {
12 	current->ioac.read_bytes += bytes;
13 }
14 
15 /*
16  * We approximate number of blocks, because we account bytes only.
17  * A 'block' is 512 bytes
18  */
19 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
20 {
21 	return p->ioac.read_bytes >> 9;
22 }
23 
24 static inline void task_io_account_write(size_t bytes)
25 {
26 	current->ioac.write_bytes += bytes;
27 }
28 
29 /*
30  * We approximate number of blocks, because we account bytes only.
31  * A 'block' is 512 bytes
32  */
33 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
34 {
35 	return p->ioac.write_bytes >> 9;
36 }
37 
38 static inline void task_io_account_cancelled_write(size_t bytes)
39 {
40 	current->ioac.cancelled_write_bytes += bytes;
41 }
42 
43 static inline void task_io_accounting_init(struct task_struct *tsk)
44 {
45 	memset(&tsk->ioac, 0, sizeof(tsk->ioac));
46 }
47 
48 #else
49 
50 static inline void task_io_account_read(size_t bytes)
51 {
52 }
53 
54 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
55 {
56 	return 0;
57 }
58 
59 static inline void task_io_account_write(size_t bytes)
60 {
61 }
62 
63 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
64 {
65 	return 0;
66 }
67 
68 static inline void task_io_account_cancelled_write(size_t bytes)
69 {
70 }
71 
72 static inline void task_io_accounting_init(struct task_struct *tsk)
73 {
74 }
75 
76 #endif		/* CONFIG_TASK_IO_ACCOUNTING */
77 #endif		/* __TASK_IO_ACCOUNTING_OPS_INCLUDED */
78