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blk-mq: support at_head inserations for blk_execute_rq 

This is neede for proper SG_IO operation as well as various uses of
blk_execute_rq from the SCSI midlayer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
hifive-unleashed-5.1
Christoph Hellwig 2014-02-07 10:22:36 -08:00 committed by Jens Axboe
parent 96d2e8b5e2
commit 72a0a36e28
3 changed files with 13 additions and 9 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, true);
blk_mq_insert_request(q, rq, at_head, true);
return;
}

17
block/blk-mq.c
View File

@ -714,13 +714,16 @@ static void blk_mq_work_fn(struct work_struct *work)
}
static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx,
struct request *rq)
struct request *rq, bool at_head)
{
struct blk_mq_ctx *ctx = rq->mq_ctx;
trace_block_rq_insert(hctx->queue, rq);
list_add_tail(&rq->queuelist, &ctx->rq_list);
if (at_head)
list_add(&rq->queuelist, &ctx->rq_list);
else
list_add_tail(&rq->queuelist, &ctx->rq_list);
blk_mq_hctx_mark_pending(hctx, ctx);
/*
@ -730,7 +733,7 @@ static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx,
}
void blk_mq_insert_request(struct request_queue *q, struct request *rq,
bool run_queue)
bool at_head, bool run_queue)
{
struct blk_mq_hw_ctx *hctx;
struct blk_mq_ctx *ctx, *current_ctx;
@ -749,7 +752,7 @@ void blk_mq_insert_request(struct request_queue *q, struct request *rq,
rq->mq_ctx = ctx;
}
spin_lock(&ctx->lock);
__blk_mq_insert_request(hctx, rq);
__blk_mq_insert_request(hctx, rq, at_head);
spin_unlock(&ctx->lock);
blk_mq_put_ctx(current_ctx);
@ -781,7 +784,7 @@ void blk_mq_run_request(struct request *rq, bool run_queue, bool async)
/* ctx->cpu might be offline */
spin_lock(&ctx->lock);
__blk_mq_insert_request(hctx, rq);
__blk_mq_insert_request(hctx, rq, false);
spin_unlock(&ctx->lock);
blk_mq_put_ctx(current_ctx);
@ -819,7 +822,7 @@ static void blk_mq_insert_requests(struct request_queue *q,
rq = list_first_entry(list, struct request, queuelist);
list_del_init(&rq->queuelist);
rq->mq_ctx = ctx;
__blk_mq_insert_request(hctx, rq);
__blk_mq_insert_request(hctx, rq, false);
}
spin_unlock(&ctx->lock);
@ -971,7 +974,7 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio)
__blk_mq_free_request(hctx, ctx, rq);
else {
blk_mq_bio_to_request(rq, bio);
__blk_mq_insert_request(hctx, rq);
__blk_mq_insert_request(hctx, rq, false);
}
spin_unlock(&ctx->lock);

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

@ -122,7 +122,8 @@ 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);
void blk_mq_insert_request(struct request_queue *, struct request *,
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 *);