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blk-mq: refactor blk_mq_sched_assign_ioc 

blk_mq_sched_assign_ioc now only handles the assigned of the ioc if
the schedule needs it (bfq only at the moment).  The caller to the
per-request initializer is moved out so that it can be merged with
a similar call for the kyber I/O scheduler.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2017-06-16 18:15:25 +02:00 committed by Jens Axboe
parent 9f21073826
commit 44e8c2bff8
3 changed files with 17 additions and 28 deletions
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28
block/blk-mq-sched.c
View File

@ -31,12 +31,10 @@ void blk_mq_sched_free_hctx_data(struct request_queue *q,
}
EXPORT_SYMBOL_GPL(blk_mq_sched_free_hctx_data);
static void __blk_mq_sched_assign_ioc(struct request_queue *q,
struct request *rq,
struct bio *bio,
struct io_context *ioc)
void blk_mq_sched_assign_ioc(struct request *rq, struct bio *bio)
{
struct elevator_queue *e = q->elevator;
struct request_queue *q = rq->q;
struct io_context *ioc = rq_ioc(bio);
struct io_cq *icq;
spin_lock_irq(q->queue_lock);
@ -48,26 +46,8 @@ static void __blk_mq_sched_assign_ioc(struct request_queue *q,
if (!icq)
return;
}
rq->elv.icq = icq;
if (e && e->type->ops.mq.get_rq_priv &&
e->type->ops.mq.get_rq_priv(q, rq, bio)) {
rq->elv.icq = NULL;
return;
}
rq->rq_flags |= RQF_ELVPRIV;
get_io_context(icq->ioc);
}
void blk_mq_sched_assign_ioc(struct request_queue *q, struct request *rq,
struct bio *bio)
{
struct io_context *ioc;
ioc = rq_ioc(bio);
if (ioc)
__blk_mq_sched_assign_ioc(q, rq, bio, ioc);
rq->elv.icq = icq;
}
void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx)

3
block/blk-mq-sched.h
View File

@ -7,8 +7,7 @@
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_queue *q, struct request *rq,
struct bio *bio);
void blk_mq_sched_assign_ioc(struct request *rq, struct bio *bio);
void blk_mq_sched_request_inserted(struct request *rq);
bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,

14
block/blk-mq.c
View File

@ -315,8 +315,18 @@ allocated:
if (!op_is_flush(op)) {
rq->elv.icq = NULL;
if (e && e->type->icq_cache)
blk_mq_sched_assign_ioc(q, rq, bio);
if (e && e->type->ops.mq.get_rq_priv) {
if (e->type->icq_cache && rq_ioc(bio))
blk_mq_sched_assign_ioc(rq, bio);
if (e->type->ops.mq.get_rq_priv(q, rq, bio)) {
if (rq->elv.icq)
put_io_context(rq->elv.icq->ioc);
rq->elv.icq = NULL;
} else {
rq->rq_flags |= RQF_ELVPRIV;
}
}
}
data->hctx->queued++;
return rq;