[PATCH 1/3] nvme: do not check for ns on rw path

[Christoph Hellwig]

On Sat, Nov 04, 2017 at 09:38:45AM -0600, Keith Busch wrote:
> That's not quite right. For non-PI metadata formats, we use the
> 'nop_profile', which gets the metadata buffer allocated so we can safely
> use a metadata formatted namespace. There's no in-kernel user of the
> allocated payload, but we still need the metadata buffer in order to
> use the namespace at all.

You're right.  But that means we will indeed always have a matching
integrity payload here and the check should not be needed.

Are you fine with turning it into something like:

	if (WARN_ON_ONCE(ns->ms && !blk_integrity_rq(req)))
		return BLK_STS_IOERR;

?