[Drbd-dev] [dm-devel] [PATCH 19/32] block: add helper to get data dir from op

[Christoph Hellwig]

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.