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06447ae5e3
systemd added a modified copy of include/linux/ioprio.h into its code to get the relevant content definitions for the exposed ioprio_[get|set] system calls. Move the user space relevant ioprio bits to the UAPI includes to be able to use the ioprio_[get|set] syscalls as intended. Cc: Kay Sievers <kay@vrfy.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: linux-block@vger.kernel.org Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Link: https://lore.kernel.org/r/20210714195655.181943-1-socketcan@hartkopp.net Signed-off-by: Jens Axboe <axboe@kernel.dk>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* 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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* 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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