Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef IOPRIO_H
3#define IOPRIO_H
4
5#include <linux/sched.h>
6#include <linux/sched/rt.h>
7#include <linux/iocontext.h>
8
9#include <uapi/linux/ioprio.h>
10
11/*
12 * Default IO priority.
13 */
14#define IOPRIO_DEFAULT IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0)
15
16/*
17 * Check that a priority value has a valid class.
18 */
19static inline bool ioprio_valid(unsigned short ioprio)
20{
21 unsigned short class = IOPRIO_PRIO_CLASS(ioprio);
22
23 return class > IOPRIO_CLASS_NONE && class <= IOPRIO_CLASS_IDLE;
24}
25
26/*
27 * if process has set io priority explicitly, use that. if not, convert
28 * the cpu scheduler nice value to an io priority
29 */
30static inline int task_nice_ioprio(struct task_struct *task)
31{
32 return (task_nice(task) + 20) / 5;
33}
34
35/*
36 * This is for the case where the task hasn't asked for a specific IO class.
37 * Check for idle and rt task process, and return appropriate IO class.
38 */
39static inline int task_nice_ioclass(struct task_struct *task)
40{
41 if (task->policy == SCHED_IDLE)
42 return IOPRIO_CLASS_IDLE;
43 else if (task_is_realtime(task))
44 return IOPRIO_CLASS_RT;
45 else
46 return IOPRIO_CLASS_BE;
47}
48
49#ifdef CONFIG_BLOCK
50int __get_task_ioprio(struct task_struct *p);
51#else
52static inline int __get_task_ioprio(struct task_struct *p)
53{
54 return IOPRIO_DEFAULT;
55}
56#endif /* CONFIG_BLOCK */
57
58static inline int get_current_ioprio(void)
59{
60 return __get_task_ioprio(current);
61}
62
63extern int set_task_ioprio(struct task_struct *task, int ioprio);
64
65#ifdef CONFIG_BLOCK
66extern int ioprio_check_cap(int ioprio);
67#else
68static inline int ioprio_check_cap(int ioprio)
69{
70 return -ENOTBLK;
71}
72#endif /* CONFIG_BLOCK */
73
74#endif