linux-kernel - Re: [PATCH 2/2] nvme: add emulation for zone-append

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Date:   Tue, 18 Aug 2020 10:39:36 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Javier Gonzalez <javier@...igon.com>
Cc:     Christoph Hellwig <hch@....de>,
        Kanchan Joshi <joshi.k@...sung.com>, Damien.LeMoal@....com,
        axboe@...nel.dk, sagi@...mberg.me, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, johannes.thumshirn@....com,
        Nitesh Shetty <nj.shetty@...sung.com>,
        SelvaKumar S <selvakuma.s1@...sung.com>
Subject: Re: [PATCH 2/2] nvme: add emulation for zone-append

On Tue, Aug 18, 2020 at 07:29:12PM +0200, Javier Gonzalez wrote:
> On 18.08.2020 09:58, Keith Busch wrote:
> > On Tue, Aug 18, 2020 at 11:50:33AM +0200, Javier Gonzalez wrote:
> > > a number of customers are requiring the use of normal writes, which we
> > > want to support.
> > 
> > A device that supports append is completely usable for those customers,
> > too. There's no need to create divergence in this driver.
> 
> Not really. You know as well as I do that some features are disabled for
> a particular SSD model on customer requirements. Generic models
> implementing append can submit both I/Os, but those that remove append
> are left out.

You are only supporting my point: if your device supports append, you
get to work in every ZNS use case, otherwise you only get to work in a
subset.