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102 lines
2.4 KiB
102 lines
2.4 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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/* |
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* Gives us 8 prio classes with 13-bits of data for each class |
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*/ |
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#define IOPRIO_CLASS_SHIFT (13) |
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#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1) |
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#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT) |
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#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK) |
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#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data) |
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#define ioprio_valid(mask) (IOPRIO_PRIO_CLASS((mask)) != IOPRIO_CLASS_NONE) |
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/* |
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* These are the io priority groups as implemented by CFQ. RT is the realtime |
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* class, it always gets premium service. BE is the best-effort scheduling |
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* class, the default for any process. IDLE is the idle scheduling class, it |
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* is only served when no one else is using the disk. |
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*/ |
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enum { |
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IOPRIO_CLASS_NONE, |
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IOPRIO_CLASS_RT, |
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IOPRIO_CLASS_BE, |
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IOPRIO_CLASS_IDLE, |
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}; |
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/* |
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* 8 best effort priority levels are supported |
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*/ |
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#define IOPRIO_BE_NR (8) |
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enum { |
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IOPRIO_WHO_PROCESS = 1, |
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IOPRIO_WHO_PGRP, |
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IOPRIO_WHO_USER, |
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}; |
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/* |
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* Fallback BE priority |
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*/ |
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#define IOPRIO_NORM (4) |
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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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/* |
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* If the calling process has set an I/O priority, use that. Otherwise, return |
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* the default I/O priority. |
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*/ |
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static inline int get_current_ioprio(void) |
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{ |
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struct io_context *ioc = current->io_context; |
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if (ioc) |
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return ioc->ioprio; |
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return IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0); |
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} |
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/* |
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* For inheritance, return the highest of the two given priorities |
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*/ |
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extern int ioprio_best(unsigned short aprio, unsigned short bprio); |
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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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