[PATCH 9/9] nvme: add support for streams and directives

[Jens Axboe]

On 06/27/2017 08:11 AM, Christoph Hellwig wrote:
> On Mon, Jun 26, 2017 at 07:56:22AM -0600, Jens Axboe wrote:
>>>  - do we even need the < 4 streams fallback now that they are global
>>>    instead of per-ns instead of just disabling the feature for now?
>>
>> Maybe the device only supports 2? or 3?
> 
> My crystal ball indicates that those are unlikely too see the
> light.  IFF we need to handle them we can still add code for it.

But we have to handle it, not doing so would be fragile. So our
options are:

1) Keep the stream_mappings[] array. It's simple, and it'll work
   for any number of streams.

2) Kill stream_mappings[] and just do the MOD again.

I'd strongly lean towards #1. I don't have a lot of faith in
crystal balls.

-- 
Jens Axboe