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authorChristoph Hellwig <hch@lst.de>2014-04-14 10:30:07 +0200
committerJens Axboe <axboe@fb.com>2014-04-15 14:03:02 -0600
commit9d74e25737d73e93ccddeb5a61bcd56b7b8eb57b (patch)
treec36c53290f8b5ed7f1ae9a89b534a9c3155c0491 /block
parent742ee69b92d9559e968f70cf0a49157866f8fbef (diff)
blk-mq: do not initialize req->special
Drivers can reach their private data easily using the blk_mq_rq_to_pdu helper and don't need req->special. By not initializing it code can be simplified nicely, and we also shave off a few more instructions from the I/O path. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-flush.c10
-rw-r--r--block/blk-mq.c15
-rw-r--r--block/blk-mq.h1
3 files changed, 4 insertions, 22 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 77f20458910c..0e42adcfb55e 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -306,22 +306,16 @@ static bool blk_kick_flush(struct request_queue *q)
*/
q->flush_pending_idx ^= 1;
+ blk_rq_init(q, q->flush_rq);
if (q->mq_ops) {
- struct blk_mq_ctx *ctx = first_rq->mq_ctx;
- struct blk_mq_hw_ctx *hctx = q->mq_ops->map_queue(q, ctx->cpu);
-
- blk_mq_rq_init(hctx, q->flush_rq);
- q->flush_rq->mq_ctx = ctx;
-
/*
* Reuse the tag value from the fist waiting request,
* with blk-mq the tag is generated during request
* allocation and drivers can rely on it being inside
* the range they asked for.
*/
+ q->flush_rq->mq_ctx = first_rq->mq_ctx;
q->flush_rq->tag = first_rq->tag;
- } else {
- blk_rq_init(q, q->flush_rq);
}
q->flush_rq->cmd_type = REQ_TYPE_FS;
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 658428a28faf..d9d0984d2f01 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -251,24 +251,13 @@ struct request *blk_mq_alloc_reserved_request(struct request_queue *q, int rw,
}
EXPORT_SYMBOL(blk_mq_alloc_reserved_request);
-/*
- * Re-init and set pdu, if we have it
- */
-void blk_mq_rq_init(struct blk_mq_hw_ctx *hctx, struct request *rq)
-{
- blk_rq_init(hctx->queue, rq);
-
- if (hctx->cmd_size)
- rq->special = blk_mq_rq_to_pdu(rq);
-}
-
static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx,
struct blk_mq_ctx *ctx, struct request *rq)
{
const int tag = rq->tag;
struct request_queue *q = rq->q;
- blk_mq_rq_init(hctx, rq);
+ blk_rq_init(hctx->queue, rq);
blk_mq_put_tag(hctx->tags, tag);
blk_mq_queue_exit(q);
@@ -1165,7 +1154,7 @@ static int blk_mq_init_rq_map(struct blk_mq_hw_ctx *hctx,
left -= to_do * rq_size;
for (j = 0; j < to_do; j++) {
hctx->rqs[i] = p;
- blk_mq_rq_init(hctx, hctx->rqs[i]);
+ blk_rq_init(hctx->queue, hctx->rqs[i]);
p += rq_size;
i++;
}
diff --git a/block/blk-mq.h b/block/blk-mq.h
index ebbe6bac9d61..238379a612e4 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -27,7 +27,6 @@ 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);
void blk_mq_free_queue(struct request_queue *q);
-void blk_mq_rq_init(struct blk_mq_hw_ctx *hctx, struct request *rq);
/*
* CPU hotplug helpers