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

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Date:   Mon, 6 Nov 2017 10:13:24 +0100
From:   Christoph Hellwig <hch@....de>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        Javier González <jg@...htnvm.io>,
        sagi@...mberg.me, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Javier González <javier@...xlabs.com>
Subject: Re: [PATCH 1/3] nvme: do not check for ns on rw path

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;

?