From e2b3fa5af70c1e646270f6c7c799414f5e904d7a Mon Sep 17 00:00:00 2001 From: Damien Le Moal Date: Tue, 20 Nov 2018 10:52:34 +0900 Subject: [PATCH] block: Remove bio->bi_ioc bio->bi_ioc is never set so always NULL. Remove references to it in bio_disassociate_task() and in rq_ioc() and delete this field from struct bio. With this change, rq_ioc() always returns current->io_context without the need for a bio argument. Further simplify the code and make it more readable by also removing this helper, which also allows to simplify blk_mq_sched_assign_ioc() by removing its bio argument. Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Reviewed-by: Adam Manzanares Signed-off-by: Damien Le Moal Signed-off-by: Jens Axboe --- block/bio.c | 4 ---- block/blk-core.c | 2 +- block/blk-mq-sched.c | 4 ++-- block/blk-mq-sched.h | 2 +- block/blk-mq.c | 4 ++-- block/blk.h | 16 ---------------- include/linux/blk_types.h | 3 +-- 7 files changed, 7 insertions(+), 28 deletions(-) diff --git a/block/bio.c b/block/bio.c index 4f4d9884443b..03895cc0d74a 100644 --- a/block/bio.c +++ b/block/bio.c @@ -2027,10 +2027,6 @@ int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg) */ void bio_disassociate_task(struct bio *bio) { - if (bio->bi_ioc) { - put_io_context(bio->bi_ioc); - bio->bi_ioc = NULL; - } if (bio->bi_css) { css_put(bio->bi_css); bio->bi_css = NULL; diff --git a/block/blk-core.c b/block/blk-core.c index d6e8ab9ca99d..492648c96992 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -813,7 +813,7 @@ out: void blk_init_request_from_bio(struct request *req, struct bio *bio) { - struct io_context *ioc = rq_ioc(bio); + struct io_context *ioc = current->io_context; if (bio->bi_opf & REQ_RAHEAD) req->cmd_flags |= REQ_FAILFAST_MASK; diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index d084f731d104..13b8dc332541 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -31,10 +31,10 @@ void blk_mq_sched_free_hctx_data(struct request_queue *q, } EXPORT_SYMBOL_GPL(blk_mq_sched_free_hctx_data); -void blk_mq_sched_assign_ioc(struct request *rq, struct bio *bio) +void blk_mq_sched_assign_ioc(struct request *rq) { struct request_queue *q = rq->q; - struct io_context *ioc = rq_ioc(bio); + struct io_context *ioc = current->io_context; struct io_cq *icq; spin_lock_irq(&q->queue_lock); diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h index 7ff5671bf128..0f719c8532ae 100644 --- a/block/blk-mq-sched.h +++ b/block/blk-mq-sched.h @@ -8,7 +8,7 @@ void blk_mq_sched_free_hctx_data(struct request_queue *q, void (*exit)(struct blk_mq_hw_ctx *)); -void blk_mq_sched_assign_ioc(struct request *rq, struct bio *bio); +void blk_mq_sched_assign_ioc(struct request *rq); void blk_mq_sched_request_inserted(struct request *rq); bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio, diff --git a/block/blk-mq.c b/block/blk-mq.c index 52b1c97cd7c6..174384eaace7 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -389,8 +389,8 @@ static struct request *blk_mq_get_request(struct request_queue *q, if (!op_is_flush(data->cmd_flags)) { rq->elv.icq = NULL; if (e && e->type->ops.prepare_request) { - if (e->type->icq_cache && rq_ioc(bio)) - blk_mq_sched_assign_ioc(rq, bio); + if (e->type->icq_cache) + blk_mq_sched_assign_ioc(rq); e->type->ops.prepare_request(rq, bio); rq->rq_flags |= RQF_ELVPRIV; diff --git a/block/blk.h b/block/blk.h index 816a9abb87cd..610948157a5b 100644 --- a/block/blk.h +++ b/block/blk.h @@ -254,22 +254,6 @@ void ioc_clear_queue(struct request_queue *q); int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); -/** - * rq_ioc - determine io_context for request allocation - * @bio: request being allocated is for this bio (can be %NULL) - * - * Determine io_context to use for request allocation for @bio. May return - * %NULL if %current->io_context doesn't exist. - */ -static inline struct io_context *rq_ioc(struct bio *bio) -{ -#ifdef CONFIG_BLK_CGROUP - if (bio && bio->bi_ioc) - return bio->bi_ioc; -#endif - return current->io_context; -} - /** * create_io_context - try to create task->io_context * @gfp_mask: allocation mask diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index dbdbfbd6a987..c0ba1a038ff3 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -174,10 +174,9 @@ struct bio { void *bi_private; #ifdef CONFIG_BLK_CGROUP /* - * Optional ioc and css associated with this bio. Put on bio + * Optional css associated with this bio. Put on bio * release. Read comment on top of bio_associate_current(). */ - struct io_context *bi_ioc; struct cgroup_subsys_state *bi_css; struct blkcg_gq *bi_blkg; struct bio_issue bi_issue; -- 2.30.2