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

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Message-ID: <20200818172912.e54klrofz3tfhxhj@MacBook-Pro.localdomain>
Date:   Tue, 18 Aug 2020 19:29:12 +0200
From:   Javier Gonzalez <javier@...igon.com>
To:     Keith Busch <kbusch@...nel.org>
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 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.

I would like to understand how we can enable these NVMe-compatible
models in Linux. If it is a performance concern, we will address it.