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blk-mq: merge blk_mq_insert_request and blk_mq_run_request

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It's almost identical to blk_mq_insert_request, so fold the two into one
slightly more generic function by making the flush special case a bit
smarted.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-02-20 15:32:37 -08:00 committed by Jens Axboe
parent fd694131bb
commit feb71dae1f
5 changed files with 17 additions and 52 deletions
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2
block/blk-exec.c
View File

@ -65,7 +65,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
* be resued after dying flag is set
*/
if (q->mq_ops) {
blk_mq_insert_request(q, rq, at_head, true);
blk_mq_insert_request(rq, at_head, true, false);
return;
}

4
block/blk-flush.c
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@ -137,7 +137,7 @@ static void mq_flush_run(struct work_struct *work)
rq = container_of(work, struct request, mq_flush_work);
memset(&rq->csd, 0, sizeof(rq->csd));
blk_mq_run_request(rq, true, false);
blk_mq_insert_request(rq, false, true, false);
}
static bool blk_flush_queue_rq(struct request *rq)
@ -411,7 +411,7 @@ void blk_insert_flush(struct request *rq)
if ((policy & REQ_FSEQ_DATA) &&
!(policy & (REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH))) {
if (q->mq_ops) {
blk_mq_run_request(rq, false, true);
blk_mq_insert_request(rq, false, false, true);
} else
list_add_tail(&rq->queuelist, &q->queue_head);
return;

59
block/blk-mq.c
View File

@ -724,60 +724,27 @@ static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx,
blk_mq_add_timer(rq);
}
void blk_mq_insert_request(struct request_queue *q, struct request *rq,
bool at_head, bool run_queue)
{
struct blk_mq_hw_ctx *hctx;
struct blk_mq_ctx *ctx, *current_ctx;
ctx = rq->mq_ctx;
hctx = q->mq_ops->map_queue(q, ctx->cpu);
if (rq->cmd_flags & (REQ_FLUSH | REQ_FUA)) {
blk_insert_flush(rq);
} else {
current_ctx = blk_mq_get_ctx(q);
if (!cpu_online(ctx->cpu)) {
ctx = current_ctx;
hctx = q->mq_ops->map_queue(q, ctx->cpu);
rq->mq_ctx = ctx;
}
spin_lock(&ctx->lock);
__blk_mq_insert_request(hctx, rq, at_head);
spin_unlock(&ctx->lock);
blk_mq_put_ctx(current_ctx);
}
if (run_queue)
__blk_mq_run_hw_queue(hctx);
}
EXPORT_SYMBOL(blk_mq_insert_request);
/*
* This is a special version of blk_mq_insert_request to bypass FLUSH request
* check. Should only be used internally.
*/
void blk_mq_run_request(struct request *rq, bool run_queue, bool async)
void blk_mq_insert_request(struct request *rq, bool at_head, bool run_queue,
bool async)
{
struct request_queue *q = rq->q;
struct blk_mq_hw_ctx *hctx;
struct blk_mq_ctx *ctx, *current_ctx;
struct blk_mq_ctx *ctx = rq->mq_ctx, *current_ctx;
current_ctx = blk_mq_get_ctx(q);
if (!cpu_online(ctx->cpu))
rq->mq_ctx = ctx = current_ctx;
ctx = rq->mq_ctx;
if (!cpu_online(ctx->cpu)) {
ctx = current_ctx;
rq->mq_ctx = ctx;
}
hctx = q->mq_ops->map_queue(q, ctx->cpu);
/* ctx->cpu might be offline */
spin_lock(&ctx->lock);
__blk_mq_insert_request(hctx, rq, false);
spin_unlock(&ctx->lock);
if (rq->cmd_flags & (REQ_FLUSH | REQ_FUA) &&
!(rq->cmd_flags & (REQ_FLUSH_SEQ))) {
blk_insert_flush(rq);
} else {
spin_lock(&ctx->lock);
__blk_mq_insert_request(hctx, rq, at_head);
spin_unlock(&ctx->lock);
}
blk_mq_put_ctx(current_ctx);

1
block/blk-mq.h
View File

@ -23,7 +23,6 @@ struct blk_mq_ctx {
};
void __blk_mq_complete_request(struct request *rq);
void blk_mq_run_request(struct request *rq, bool run_queue, bool async);
void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
void blk_mq_init_flush(struct request_queue *q);
void blk_mq_drain_queue(struct request_queue *q);

3
include/linux/blk-mq.h
View File

@ -121,8 +121,7 @@ void blk_mq_init_commands(struct request_queue *, void (*init)(void *data, struc
void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
void blk_mq_insert_request(struct request_queue *, struct request *,
bool, bool);
void blk_mq_insert_request(struct request *, bool, bool, bool);
void blk_mq_run_queues(struct request_queue *q, bool async);
void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);