nvme driver split, the easy part

[Christoph Hellwig]

On Mon, Oct 12, 2015 at 05:31:54PM +0000, Keith Busch wrote:
>> That's handled by "nvme: refactor nvme_queue_rq" which now uses
>> a common helper to map data and metadata shared by the read/write
>> and passthrough path.
>
> Aha, so it is. Very cool, I'm still getting used to the recent changes. :)

I only sent that out late last week, and it still needs a throughout
review from you.

Note that only this second series depends on that series, the first
one only touches unrelated code.