linux-kernel - Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

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Date:	Sat, 7 Nov 2015 02:19:32 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Mike Christie <mchristi@...hat.com>
Cc:	Bart Van Assche <bart.vanassche@...disk.com>,
	device-mapper development <dm-devel@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	drbd-dev@...ts.linbit.com
Subject: Re: [dm-devel] [PATCH 19/32] block: add helper to get data dir from
 op

On Thu, Nov 05, 2015 at 11:34:07AM -0600, Mike Christie wrote:
> I can do that. You are right in how they are used. I just did the above,
> to follow the other *_data_dir calls.

I think the *_data_dir calls are horrible interfaces.  But your series
already is huge, so if it makes your life easier I'd say keep it as-is
for now.  But in the long run we should have the interfaces that Bart
suggested, and one that gives you a dma_data_direction from a request,
as that's what a lot of the driver ultimatively want.
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