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authorChristoph Hellwig <hch@lst.de>2017-06-16 18:15:25 +0200
committerJens Axboe <axboe@kernel.dk>2017-06-18 10:08:55 -0600
commit44e8c2bff80bb384a608406009948f90a78bf8a3 (patch)
tree416c4aea5fb5c635bdc94170b8fb14ab284f21a4
parent9f2107382636cf9a71951eb71ec04f2fb3641b37 (diff)
downloadlinux-44e8c2bff80bb384a608406009948f90a78bf8a3.tar.bz2
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>
-rw-r--r--block/blk-mq-sched.c28
-rw-r--r--block/blk-mq-sched.h3
-rw-r--r--block/blk-mq.c14
3 files changed, 17 insertions, 28 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 22601e5c6f19..254d1c164567 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -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)
diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
index f34e6a522105..e117edd039b1 100644
--- a/block/blk-mq-sched.h
+++ b/block/blk-mq-sched.h
@@ -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,
diff --git a/block/blk-mq.c b/block/blk-mq.c
index e056725679a8..2f380ab7a603 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -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;