[PATCH 02/12] blk-mq: Introduce blk_mq_hctx_stopped()

[Ming Lei]

On Thu, Oct 27, 2016 at 6:51 AM, Bart Van Assche
<bart.vanassche at sandisk.com> wrote:
> Multiple functions test the BLK_MQ_S_STOPPED bit so introduce
> a helper function that performs this test.
>
> Signed-off-by: Bart Van Assche <bart.vanassche at sandisk.com>
> Cc: Christoph Hellwig <hch at lst.de>
> Cc: Hannes Reinecke <hare at suse.com>
> Cc: Sagi Grimberg <sagi at grimberg.me>
> Cc: Johannes Thumshirn <jthumshirn at suse.de>

Reviewed-by: Ming Lei <tom.leiming at gmail.com>

> ---
>  block/blk-mq.c | 12 ++++++------
>  block/blk-mq.h |  5 +++++
>  2 files changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index b5dcafb..b52b3a6 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -787,7 +787,7 @@ static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx)
>         struct list_head *dptr;
>         int queued;
>
> -       if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state)))
> +       if (unlikely(blk_mq_hctx_stopped(hctx)))
>                 return;
>
>         WARN_ON(!cpumask_test_cpu(raw_smp_processor_id(), hctx->cpumask) &&
> @@ -912,8 +912,8 @@ static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx)
>
>  void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async)
>  {
> -       if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state) ||
> -           !blk_mq_hw_queue_mapped(hctx)))
> +       if (unlikely(blk_mq_hctx_stopped(hctx) ||
> +                    !blk_mq_hw_queue_mapped(hctx)))
>                 return;
>
>         if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) {
> @@ -938,7 +938,7 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async)
>         queue_for_each_hw_ctx(q, hctx, i) {
>                 if ((!blk_mq_hctx_has_pending(hctx) &&
>                     list_empty_careful(&hctx->dispatch)) ||
> -                   test_bit(BLK_MQ_S_STOPPED, &hctx->state))
> +                   blk_mq_hctx_stopped(hctx))
>                         continue;
>
>                 blk_mq_run_hw_queue(hctx, async);
> @@ -988,7 +988,7 @@ void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async)
>         int i;
>
>         queue_for_each_hw_ctx(q, hctx, i) {
> -               if (!test_bit(BLK_MQ_S_STOPPED, &hctx->state))
> +               if (!blk_mq_hctx_stopped(hctx))
>                         continue;
>
>                 clear_bit(BLK_MQ_S_STOPPED, &hctx->state);
> @@ -1332,7 +1332,7 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
>                 blk_mq_put_ctx(data.ctx);
>                 if (!old_rq)
>                         goto done;
> -               if (test_bit(BLK_MQ_S_STOPPED, &data.hctx->state) ||
> +               if (blk_mq_hctx_stopped(data.hctx) ||
>                     blk_mq_direct_issue_request(old_rq, &cookie) != 0)
>                         blk_mq_insert_request(old_rq, false, true, true);
>                 goto done;
> diff --git a/block/blk-mq.h b/block/blk-mq.h
> index e5d2524..ac772da 100644
> --- a/block/blk-mq.h
> +++ b/block/blk-mq.h
> @@ -100,6 +100,11 @@ static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
>         data->hctx = hctx;
>  }
>
> +static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
> +{
> +       return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
> +}
> +
>  static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
>  {
>         return hctx->nr_ctx && hctx->tags;
> --
> 2.10.1
>



-- 
Ming Lei