On Fri, May 30, 2014 at 08:09:51AM -0600, Jens Axboe wrote:
> I have applied this one, but it irks me a little bit since we have
> to touch q->flush_rq->stuff from a potential hot path. I haven't
> thought much about this yet, but it would be a lot better if we
> could fold in the flush tag somehow.

This one also breaks scsi-mq by changing the first parameter of
blk_mq_tag_to_rq.  With host-wide tags we won't have a hardware context
easily available when looking for a request by tag.

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