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_io_accounting *ioac)
44 {
45 	memset(ioac, 0, sizeof(*ioac));
46 }
47 
48 static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
49 						struct task_io_accounting *src)
50 {
51 	dst->read_bytes += src->read_bytes;
52 	dst->write_bytes += src->write_bytes;
53 	dst->cancelled_write_bytes += src->cancelled_write_bytes;
54 }
55 
56 #else
57 
58 static inline void task_io_account_read(size_t bytes)
59 {
60 }
61 
62 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
63 {
64 	return 0;
65 }
66 
67 static inline void task_io_account_write(size_t bytes)
68 {
69 }
70 
71 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
72 {
73 	return 0;
74 }
75 
76 static inline void task_io_account_cancelled_write(size_t bytes)
77 {
78 }
79 
80 static inline void task_io_accounting_init(struct task_io_accounting *ioac)
81 {
82 }
83 
84 static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
85 						struct task_io_accounting *src)
86 {
87 }
88 
89 #endif /* CONFIG_TASK_IO_ACCOUNTING */
90 
91 #ifdef CONFIG_TASK_XACCT
92 static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
93 						struct task_io_accounting *src)
94 {
95 	dst->rchar += src->rchar;
96 	dst->wchar += src->wchar;
97 	dst->syscr += src->syscr;
98 	dst->syscw += src->syscw;
99 }
100 #else
101 static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
102 						struct task_io_accounting *src)
103 {
104 }
105 #endif /* CONFIG_TASK_XACCT */
106 
107 static inline void task_io_accounting_add(struct task_io_accounting *dst,
108 						struct task_io_accounting *src)
109 {
110 	task_chr_io_accounting_add(dst, src);
111 	task_blk_io_accounting_add(dst, src);
112 }
113 #endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */
114