linux-kernel - Re: [PATCH 1/5 v2] blk-mq: Add prep/unprep support

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Date:	Thu, 16 Apr 2015 23:34:39 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Matias Bj??rling <m@...rling.me>
Cc:	hch@...radead.org, axboe@...com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	keith.busch@...el.com, javier@...etta.io
Subject: Re: [PATCH 1/5 v2] blk-mq: Add prep/unprep support

On Wed, Apr 15, 2015 at 02:34:40PM +0200, Matias Bj??rling wrote:
> Allow users to hook into prep/unprep functions just before an IO is
> dispatched to the device driver. This is necessary for request-based
> logic to take place at upper layers.

I don't think any of this logic belongs into the block layer.  All this
should be library functions called by the drivers.

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