From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 1/5 v2] blk-mq: Add prep/unprep support
Date: Thu, 16 Apr 2015 23:34:39 -0700
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To: Matias Bj??rling <m@bjorling.me>
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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.