1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Task I/O accounting operations
4  */
5 #ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
6 #define __TASK_IO_ACCOUNTING_OPS_INCLUDED
7 
8 #include <linux/sched.h>
9 
10 #ifdef CONFIG_TASK_IO_ACCOUNTING
11 static inline void task_io_account_read(size_t bytes)
12 {
13 	current->ioac.read_bytes += bytes;
14 }
15 
16 /*
17  * We approximate number of blocks, because we account bytes only.
18  * A 'block' is 512 bytes
19  */
20 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
21 {
22 	return p->ioac.read_bytes >> 9;
23 }
24 
25 static inline void task_io_account_write(size_t bytes)
26 {
27 	current->ioac.write_bytes += bytes;
28 }
29 
30 /*
31  * We approximate number of blocks, because we account bytes only.
32  * A 'block' is 512 bytes
33  */
34 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
35 {
36 	return p->ioac.write_bytes >> 9;
37 }
38 
39 static inline void task_io_account_cancelled_write(size_t bytes)
40 {
41 	current->ioac.cancelled_write_bytes += bytes;
42 }
43 
44 static inline void task_io_accounting_init(struct task_io_accounting *ioac)
45 {
46 	memset(ioac, 0, sizeof(*ioac));
47 }
48 
49 static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
50 						struct task_io_accounting *src)
51 {
52 	dst->read_bytes += src->read_bytes;
53 	dst->write_bytes += src->write_bytes;
54 	dst->cancelled_write_bytes += src->cancelled_write_bytes;
55 }
56 
57 #else
58 
59 static inline void task_io_account_read(size_t bytes)
60 {
61 }
62 
63 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
64 {
65 	return 0;
66 }
67 
68 static inline void task_io_account_write(size_t bytes)
69 {
70 }
71 
72 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
73 {
74 	return 0;
75 }
76 
77 static inline void task_io_account_cancelled_write(size_t bytes)
78 {
79 }
80 
81 static inline void task_io_accounting_init(struct task_io_accounting *ioac)
82 {
83 }
84 
85 static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
86 						struct task_io_accounting *src)
87 {
88 }
89 
90 #endif /* CONFIG_TASK_IO_ACCOUNTING */
91 
92 #ifdef CONFIG_TASK_XACCT
93 static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
94 						struct task_io_accounting *src)
95 {
96 	dst->rchar += src->rchar;
97 	dst->wchar += src->wchar;
98 	dst->syscr += src->syscr;
99 	dst->syscw += src->syscw;
100 }
101 #else
102 static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
103 						struct task_io_accounting *src)
104 {
105 }
106 #endif /* CONFIG_TASK_XACCT */
107 
108 static inline void task_io_accounting_add(struct task_io_accounting *dst,
109 						struct task_io_accounting *src)
110 {
111 	task_chr_io_accounting_add(dst, src);
112 	task_blk_io_accounting_add(dst, src);
113 }
114 #endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */
115