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74 lines
1.6 KiB
74 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef IOPRIO_H |
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#define IOPRIO_H |
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#include <linux/sched.h> |
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#include <linux/sched/rt.h> |
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#include <linux/iocontext.h> |
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#include <uapi/linux/ioprio.h> |
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/* |
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* Default IO priority. |
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*/ |
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#define IOPRIO_DEFAULT IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0) |
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/* |
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* Check that a priority value has a valid class. |
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*/ |
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static inline bool ioprio_valid(unsigned short ioprio) |
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{ |
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unsigned short class = IOPRIO_PRIO_CLASS(ioprio); |
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return class > IOPRIO_CLASS_NONE && class <= IOPRIO_CLASS_IDLE; |
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} |
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/* |
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* if process has set io priority explicitly, use that. if not, convert |
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* the cpu scheduler nice value to an io priority |
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*/ |
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static inline int task_nice_ioprio(struct task_struct *task) |
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{ |
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return (task_nice(task) + 20) / 5; |
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} |
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/* |
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* This is for the case where the task hasn't asked for a specific IO class. |
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* Check for idle and rt task process, and return appropriate IO class. |
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*/ |
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static inline int task_nice_ioclass(struct task_struct *task) |
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{ |
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if (task->policy == SCHED_IDLE) |
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return IOPRIO_CLASS_IDLE; |
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else if (task_is_realtime(task)) |
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return IOPRIO_CLASS_RT; |
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else |
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return IOPRIO_CLASS_BE; |
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} |
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#ifdef CONFIG_BLOCK |
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int __get_task_ioprio(struct task_struct *p); |
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#else |
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static inline int __get_task_ioprio(struct task_struct *p) |
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{ |
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return IOPRIO_DEFAULT; |
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} |
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#endif /* CONFIG_BLOCK */ |
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static inline int get_current_ioprio(void) |
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{ |
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return __get_task_ioprio(current); |
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} |
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extern int set_task_ioprio(struct task_struct *task, int ioprio); |
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#ifdef CONFIG_BLOCK |
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extern int ioprio_check_cap(int ioprio); |
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#else |
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static inline int ioprio_check_cap(int ioprio) |
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{ |
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return -ENOTBLK; |
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} |
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#endif /* CONFIG_BLOCK */ |
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#endif
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