linux-kernel - Re: [PATCH v1 5/9] block: loop: convert to blk-mq

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Date:	Fri, 15 Aug 2014 09:31:11 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Zach Brown <zab@...bo.net>, Benjamin LaHaise <bcrl@...ck.org>,
	Christoph Hellwig <hch@...radead.org>,
	Kent Overstreet <kmo@...erainc.com>, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v1 5/9] block: loop: convert to blk-mq

> +
> +static int loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
> +			  unsigned int index)
> +{
> +	struct loop_device *lo = data;
> +
> +	hctx->driver_data = lo;

I don't think there is much of a point to store this in the hctx
instead of relying on the queue.

> +static void loop_softirq_done_fn(struct request *rq)
> +{
> +	blk_mq_end_io(rq, rq->errors);
> +}

no need for a noop softirq done function.

> +static void loop_queue_work(struct work_struct *work)

Offloading work straight to a workqueue dosn't make much sense
in the blk-mq model as we'll usually be called from one.  If you
need to avoid the cases where we are called directly a flag for
the blk-mq code to always schedule a workqueue sounds like a much
better plan.

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