Commit 64845a1d authored by Damien Le Moal's avatar Damien Le Moal Committed by Jens Axboe
Browse files

block: Introduce get_current_ioprio() 



Define get_current_ioprio() as an inline helper to obtain the caller
I/O priority from its task I/O context. Use this helper in
blk_init_request_from_bio() to set a request ioprio.

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e2b3fa5a

block/blk-core.c

+1 −5
Original line number Diff line number Diff line
@@ -813,18 +813,14 @@ out: 


void blk_init_request_from_bio(struct request *req, struct bio *bio)

{

	struct io_context *ioc = current->io_context;



	if (bio->bi_opf & REQ_RAHEAD)

		req->cmd_flags |= REQ_FAILFAST_MASK;



	req->__sector = bio->bi_iter.bi_sector;

	if (ioprio_valid(bio_prio(bio)))

		req->ioprio = bio_prio(bio);

	else if (ioc)

		req->ioprio = ioc->ioprio;

	else

		req->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);

		req->ioprio = get_current_ioprio();

	req->write_hint = bio->bi_write_hint;

	blk_rq_bio_prep(req->q, req, bio);

}

include/linux/ioprio.h

+13 −0
Original line number Diff line number Diff line
@@ -70,6 +70,19 @@ static inline int task_nice_ioclass(struct task_struct *task) 
		return IOPRIO_CLASS_BE;

}



/*

 * If the calling process has set an I/O priority, use that. Otherwise, return

 * the default I/O priority.

 */

static inline int get_current_ioprio(void)

{

	struct io_context *ioc = current->io_context;



	if (ioc)

		return ioc->ioprio;

	return IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);

}



/*

 * For inheritance, return the highest of the two given priorities

 */

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