linux-kernel - Re: [PATCH v9 04/12] nvmet: make nvmet_copy_ns

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Date:   Thu, 10 Oct 2019 13:50:53 +0200
From:   Christoph Hellwig <hch@....de>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v9 04/12] nvmet: make nvmet_copy_ns_identifier()
 non-static

On Wed, Oct 09, 2019 at 01:25:21PM -0600, Logan Gunthorpe wrote:
> This function will be needed by the upcoming passthru code.
> 
> Passthru will need an emulated version of identify_desclist which
> copies the eui64, uuid and nguid from the passed-thru controller into
> the request SGL.

I don't like the way this is handled.  We should avoid faking up
behavior not supported if this really is a passthrough interface.

For this particular case this means:

 1) report the vs field that the actual controller reports
 2) if that is below 1.2.1 bump it to that, but no further
    (and maybe print a warning)
 3) don't emulate the namespace descriptor CNS ever