[PATCH] nvme-cli: add support for directive command

[Keith Busch]

On Thu, Aug 10, 2017 at 07:54:09PM -0700, kwan.huen at samsung.com wrote:
> Directive is a feature introduced in NVMe v1.3 that allows host
> and NVM subsystem or controller information exchange, namely data
> lifetime hint for example. Information is transmitted using
> the Directive Send and Directive Receive commands.
> 
> This patch set allows control of the directive resources of a
> directive-enabled nvme device.

The patches themselves look great, but I didn't realize this was a
feature user-space should be accessing. Providing this could mess up
the streams the kernel believes are set up, right?