rework NVMe command passthrough

[Christoph Hellwig]

Jens, Keith:

any opinion on this series?  I'd really prefer to have something
like this in before merging the NVMe FC support.

On Tue, Oct 25, 2016 at 06:09:37PM +0200, Christoph Hellwig wrote:
> Hi all,
> 
> this series started out as part of my attempt to get rid of the SCSI
> passthrough fields in struct request, but reviewing the NVMe FC patches
> and subsequent discussion with James gave them additional priority.
> 
> This series introduceѕ a nvme nvme_request structure common to all
> transports, which allows us to stop abusing the SCSI passthrough fields
> in struct request, and also allows us to stop passing the full CQE
> up to the callers of the request interface which is rather painful
> for FC.
> 
> 
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