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Commit 5dee8577 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

blk-mq: initialize request in __blk_mq_alloc_request 



Both callers if __blk_mq_alloc_request want to initialize the request, so
lift it into the common path.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 4ce01dd1

block/blk-mq.c

+30 −32
Original line number Diff line number Diff line
@@ -92,30 +92,6 @@ static void blk_mq_hctx_clear_pending(struct blk_mq_hw_ctx *hctx, 
	clear_bit(CTX_TO_BIT(hctx, ctx), &bm->word);

}



static struct request *__blk_mq_alloc_request(struct blk_mq_hw_ctx *hctx,

					      struct blk_mq_ctx *ctx,

					      gfp_t gfp, bool reserved)

{

	struct request *rq;

	unsigned int tag;



	tag = blk_mq_get_tag(hctx, &ctx->last_tag, gfp, reserved);

	if (tag != BLK_MQ_TAG_FAIL) {

		rq = hctx->tags->rqs[tag];



		rq->cmd_flags = 0;

		if (blk_mq_tag_busy(hctx)) {

			rq->cmd_flags = REQ_MQ_INFLIGHT;

			atomic_inc(&hctx->nr_active);

		}



		rq->tag = tag;

		return rq;

	}



	return NULL;

}



static int blk_mq_queue_enter(struct request_queue *q)

{

	int ret;
@@ -263,6 +239,32 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, 
	ctx->rq_dispatched[rw_is_sync(rw_flags)]++;

}



static struct request *

__blk_mq_alloc_request(struct request_queue *q, struct blk_mq_hw_ctx *hctx,

		struct blk_mq_ctx *ctx, int rw, gfp_t gfp, bool reserved)

{

	struct request *rq;

	unsigned int tag;



	tag = blk_mq_get_tag(hctx, &ctx->last_tag, gfp, reserved);

	if (tag != BLK_MQ_TAG_FAIL) {

		rq = hctx->tags->rqs[tag];



		rq->cmd_flags = 0;

		if (blk_mq_tag_busy(hctx)) {

			rq->cmd_flags = REQ_MQ_INFLIGHT;

			atomic_inc(&hctx->nr_active);

		}



		rq->tag = tag;

		blk_mq_rq_ctx_init(q, ctx, rq, rw);

		return rq;

	}



	return NULL;

}





static struct request *blk_mq_alloc_request_pinned(struct request_queue *q,

						   int rw, gfp_t gfp,

						   bool reserved)
@@ -273,12 +275,10 @@ static struct request *blk_mq_alloc_request_pinned(struct request_queue *q, 
		struct blk_mq_ctx *ctx = blk_mq_get_ctx(q);

		struct blk_mq_hw_ctx *hctx = q->mq_ops->map_queue(q, ctx->cpu);



		rq = __blk_mq_alloc_request(hctx, ctx, gfp & ~__GFP_WAIT,

		rq = __blk_mq_alloc_request(q, hctx, ctx, rw, gfp & ~__GFP_WAIT,

						reserved);

		if (rq) {

			blk_mq_rq_ctx_init(q, ctx, rq, rw);

		if (rq)

			break;

		}



		if (gfp & __GFP_WAIT) {

			__blk_mq_run_hw_queue(hctx);
@@ -1178,10 +1178,8 @@ static struct request *blk_mq_map_request(struct request_queue *q, 
		rw |= REQ_SYNC;



	trace_block_getrq(q, bio, rw);

	rq = __blk_mq_alloc_request(hctx, ctx, GFP_ATOMIC, false);

	if (likely(rq))

		blk_mq_rq_ctx_init(q, ctx, rq, rw);

	else {

	rq = __blk_mq_alloc_request(q, hctx, ctx, rw, GFP_ATOMIC, false);

	if (unlikely(!rq)) {

		blk_mq_put_ctx(ctx);

		trace_block_sleeprq(q, bio, rw);

		rq = blk_mq_alloc_request_pinned(q, rw, __GFP_WAIT|GFP_ATOMIC,