[PATCH] nvme: fix and clarify the check for missing metadata

[Keith Busch]

On Tue, Nov 07, 2017 at 05:27:34PM +0100, Christoph Hellwig wrote:
> Update the check in nvme_setup_rw for missing metadata so that it is
> together with the other metadata handling, does not contain impossible
> to reach conditions and warns if we get an impossible requests for
> a (non-PI) metadata-enabled namespace when CONFIG_BLK_DEV_INTEGRITY
> is not set.
> 
> Also add a little helper that checks if a given metadata configuration
> contains protection information
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Looks good to me.

Reviewed-by: Keith Busch <keith.busch at intel.com>