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
task_io_account_read(size_t bytes)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 */
task_io_get_inblock(const struct task_struct * p)19 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
20 {
21 return p->ioac.read_bytes >> 9;
22 }
23
task_io_account_write(size_t bytes)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 */
task_io_get_oublock(const struct task_struct * p)33 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
34 {
35 return p->ioac.write_bytes >> 9;
36 }
37
task_io_account_cancelled_write(size_t bytes)38 static inline void task_io_account_cancelled_write(size_t bytes)
39 {
40 current->ioac.cancelled_write_bytes += bytes;
41 }
42
task_io_accounting_init(struct task_io_accounting * ioac)43 static inline void task_io_accounting_init(struct task_io_accounting *ioac)
44 {
45 memset(ioac, 0, sizeof(*ioac));
46 }
47
task_blk_io_accounting_add(struct task_io_accounting * dst,struct task_io_accounting * src)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
task_io_account_read(size_t bytes)58 static inline void task_io_account_read(size_t bytes)
59 {
60 }
61
task_io_get_inblock(const struct task_struct * p)62 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
63 {
64 return 0;
65 }
66
task_io_account_write(size_t bytes)67 static inline void task_io_account_write(size_t bytes)
68 {
69 }
70
task_io_get_oublock(const struct task_struct * p)71 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
72 {
73 return 0;
74 }
75
task_io_account_cancelled_write(size_t bytes)76 static inline void task_io_account_cancelled_write(size_t bytes)
77 {
78 }
79
task_io_accounting_init(struct task_io_accounting * ioac)80 static inline void task_io_accounting_init(struct task_io_accounting *ioac)
81 {
82 }
83
task_blk_io_accounting_add(struct task_io_accounting * dst,struct task_io_accounting * src)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
task_chr_io_accounting_add(struct task_io_accounting * dst,struct task_io_accounting * src)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
task_chr_io_accounting_add(struct task_io_accounting * dst,struct task_io_accounting * src)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
task_io_accounting_add(struct task_io_accounting * dst,struct task_io_accounting * src)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