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blk-mq: initialize request in __blk_mq_alloc_request

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-05-27 20:59:47 +02:00 committed by Jens Axboe
parent 4ce01dd1a0
commit 5dee857720
1 changed files with 30 additions and 32 deletions
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62
block/blk-mq.c
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@ -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,