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blk-mq: cleanup blk_mq_get_driver_tag() 

We never pass 'wait' as true to blk_mq_get_driver_tag(), and hence
we never change '**hctx' as well. The last use of these went away
with the flush cleanup, commit 0c2a6fe4dc.

So cleanup the usage and remove the two extra parameters.

Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Tested-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2018-06-25 19:31:45 +08:00 committed by Jens Axboe
parent 277a4a9b56
commit 8ab6bb9ee8
2 changed files with 8 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
block/blk-mq.c
View File

@ -964,17 +964,14 @@ static inline unsigned int queued_to_index(unsigned int queued)
return min(BLK_MQ_MAX_DISPATCH_ORDER - 1, ilog2(queued) + 1);
}
bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
bool wait)
bool blk_mq_get_driver_tag(struct request *rq)
{
struct blk_mq_alloc_data data = {
.q = rq->q,
.hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu),
.flags = wait ? 0 : BLK_MQ_REQ_NOWAIT,
.flags = BLK_MQ_REQ_NOWAIT,
};
might_sleep_if(wait);
if (rq->tag != -1)
goto done;
@ -991,8 +988,6 @@ bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
}
done:
if (hctx)
*hctx = data.hctx;
return rq->tag != -1;
}
@ -1034,7 +1029,7 @@ static bool blk_mq_mark_tag_wait(struct blk_mq_hw_ctx **hctx,
* Don't clear RESTART here, someone else could have set it.
* At most this will cost an extra queue run.
*/
return blk_mq_get_driver_tag(rq, hctx, false);
return blk_mq_get_driver_tag(rq);
}
wait = &this_hctx->dispatch_wait;
@ -1055,7 +1050,7 @@ static bool blk_mq_mark_tag_wait(struct blk_mq_hw_ctx **hctx,
* allocation failure and adding the hardware queue to the wait
* queue.
*/
ret = blk_mq_get_driver_tag(rq, hctx, false);
ret = blk_mq_get_driver_tag(rq);
if (!ret) {
spin_unlock(&this_hctx->lock);
return false;
@ -1105,7 +1100,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list,
if (!got_budget && !blk_mq_get_dispatch_budget(hctx))
break;
if (!blk_mq_get_driver_tag(rq, NULL, false)) {
if (!blk_mq_get_driver_tag(rq)) {
/*
* The initial allocation attempt failed, so we need to
* rerun the hardware queue when a tag is freed. The
@ -1137,7 +1132,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list,
bd.last = true;
else {
nxt = list_first_entry(list, struct request, queuelist);
bd.last = !blk_mq_get_driver_tag(nxt, NULL, false);
bd.last = !blk_mq_get_driver_tag(nxt);
}
ret = q->mq_ops->queue_rq(hctx, &bd);
@ -1700,7 +1695,7 @@ static blk_status_t __blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
if (!blk_mq_get_dispatch_budget(hctx))
goto insert;
if (!blk_mq_get_driver_tag(rq, NULL, false)) {
if (!blk_mq_get_driver_tag(rq)) {
blk_mq_put_dispatch_budget(hctx);
goto insert;
}

3
block/blk-mq.h
View File

@ -36,8 +36,7 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
void blk_mq_wake_waiters(struct request_queue *q);
bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool);
void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
bool wait);
bool blk_mq_get_driver_tag(struct request *rq);
struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
struct blk_mq_ctx *start);