[PATCHv2] nvme: skip noiob for zoned devices

[Sagi Grimberg]

>>> On Fri, Aug 07, 2020 at 09:32:35AM -0700, Keith Busch wrote:
>>>> Zoned block devices reuse the chunk_sectors queue limit to define zone
>>>> boundaries. If a such a device happens to also report an optimal
>>>> boundary, do not use that to define the chunk_sectors as that may
>>>> intermittently interfere with io splitting and zone size queries.
>>>
>>> Instead of skipping shouldn't we use the max of noiob and the zone
>>> size, even if that is mostly theoretical?
>>
>> No, I don't think so. If noiob is larger, we'll return the wrong value
>> for blk_queue_zone_sectors() and blkdev_nr_zones(), which will have
>> undesirable consequences.
> 
> Then we at least need to warn about a larger noiob.  And add a
> comment that we are ignoring it deliberately.

I'm fine with that, Keith if you agree you can send a patch
and I'll fold it into the original one.