From: Damien Le Moal Date: Tue, 20 Nov 2018 01:52:35 +0000 (+0900) Subject: block: Introduce get_current_ioprio() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=64845a1ddd655574886eb48e9a5eaeeb9b05bf0d;p=openwrt%2Fstaging%2Fblogic.git 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: Christoph Hellwig Reviewed-by: Johannes Thumshirn Signed-off-by: Damien Le Moal Signed-off-by: Jens Axboe --- diff --git a/block/blk-core.c b/block/blk-core.c index 492648c96992..4450d3c08f25 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -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); } diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h index 9e30ed6443db..e9bfe6972aed 100644 --- a/include/linux/ioprio.h +++ b/include/linux/ioprio.h @@ -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 */