Re: [PATCH 2/2] blk-mq: allow direct dispatch to a driver specific workqueue

[Christoph Hellwig]

On Mon, Nov 03, 2014 at 04:40:47PM +0800, Ming Lei wrote:
> The above two aren't enough because the big problem is that
> drivers need a per-request work structure instead of 'hctx->run_work',
> otherwise there are at most NR_CPUS concurrent submissions.
> 
> So the per-request work structure should be exposed to blk-mq
> too for the kind of usage, such as .blk_mq_req_work(req) callback
> in case of BLK_MQ_F_WORKQUEUE.

Hmm.  Maybe a better option is to just add a flag to never defer
->queue_rq to a workqueue and let drivers handle the it?
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