Re: split scsi passthrough fields out of struct request V2

[Jens Axboe <axboe@fb.com>]

On Wed, Jan 25 2017, Christoph Hellwig wrote:
> Hi all,
> 
> this series splits the support for SCSI passthrough commands from the
> main struct request used all over the block layer into a separate
> scsi_request structure that drivers that want to support SCSI passthough
> need to embedded as the first thing into their request-private data,
> similar to how we handle NVMe passthrough commands.
> 
> To support this I've added support for that the private data after
> request structure to the legacy request path instead, so that it can
> be treated the same way as the blk-mq path.  Compare to the current
> scsi_cmnd allocator that actually is a major simplification.
> 
> Changes since V1:
>  - fix handling of a NULL sense pointer in __scsi_execute
>  - clean up handling of the flush flags in the block layer and MD
>  - additional small cleanup in dm-rq

I've queued this up for 4.11. Since some of the patches had dependencies
on changes in master since for-4.11/block was forked, they are sitting
in a separate branch that has both for-4.11/block and v4.10-rc5 pulled
in first. for-next has everything, as usual.

-- 
Jens Axboe