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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200818181308.7g3xom4lxwuoogev@MacBook-Pro.localdomain>
Date:   Tue, 18 Aug 2020 20:13:08 +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 10:39, Keith Busch wrote:
>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.

There are several devices. Some of them enable append and some do not. I
would like to support the later too.