Re: [PATCH RFC 4/4] nvme-multipath: disable polling for underlying namespace request queue

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On Tue, Dec 11, 2018 at 11:19:22PM -0800, Sagi Grimberg wrote:
>> So we need to make sure in the block layer or I/O submitter that
>> REQ_HIPRI is only set if QUEUE_FLAG_POLL is supported.  I think it would
>> also help if we rename it to REQ_POLL to make this more obvious.
>
> It used to check for it, but was changed to look at nr_maps instead...
> So I think this is a regression...

blk_mq_map_queue looks at both QUEUE_FLAG_POLL and nr_maps for the
queue selection, but that doesn't help with the problem that we should
never pass poll requests through stacking devices.



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