linux-kernel - Re: [PATCH 1/4] blk-mq-tag: support queue filter in bt_tags

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Message-ID: <f3495925-d681-ba7f-5c2f-d2c19453b067@acm.org>
Date:   Mon, 21 Aug 2023 12:58:56 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     chengming.zhou@...ux.dev, axboe@...nel.dk, ming.lei@...hat.com,
        hch@....de
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhouchengming@...edance.com
Subject: Re: [PATCH 1/4] blk-mq-tag: support queue filter in bt_tags_iter()

On 8/21/23 00:35, chengming.zhou@...ux.dev wrote:
> @@ -417,7 +425,23 @@ static void __blk_mq_all_tag_iter(struct blk_mq_tags *tags,
>   void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
>   		void *priv)
>   {
> -	__blk_mq_all_tag_iter(tags, fn, priv, BT_TAG_ITER_STATIC_RQS);
> +	__blk_mq_all_tag_iter(tags, fn, priv, BT_TAG_ITER_STATIC_RQS, NULL);
> +}
> +
> +static void __blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
> +				      busy_tag_iter_fn *fn, void *priv,
> +				      struct request_queue *q)
> +{
> +	unsigned int flags = tagset->flags;
> +	int i, nr_tags;
> +
> +	nr_tags = blk_mq_is_shared_tags(flags) ? 1 : tagset->nr_hw_queues;
> +
> +	for (i = 0; i < nr_tags; i++) {
> +		if (tagset->tags && tagset->tags[i])
> +			__blk_mq_all_tag_iter(tagset->tags[i], fn, priv,
> +					      BT_TAG_ITER_STARTED, q);
> +	}
>   }
>   
>   /**
> @@ -436,16 +460,7 @@ void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
>   void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
>   		busy_tag_iter_fn *fn, void *priv)
>   {
> -	unsigned int flags = tagset->flags;
> -	int i, nr_tags;
> -
> -	nr_tags = blk_mq_is_shared_tags(flags) ? 1 : tagset->nr_hw_queues;
> -
> -	for (i = 0; i < nr_tags; i++) {
> -		if (tagset->tags && tagset->tags[i])
> -			__blk_mq_all_tag_iter(tagset->tags[i], fn, priv,
> -					      BT_TAG_ITER_STARTED);
> -	}
> +	__blk_mq_tagset_busy_iter(tagset, fn, priv, NULL);
>   }
>   EXPORT_SYMBOL(blk_mq_tagset_busy_iter);

One change per patch please. I think the introduction of __blk_mq_tagset_busy_iter()
should be a separate patch instead of happening in this patch.

Thanks,

Bart.