linux-kernel - Re: [PATCH 0/3] zone-append support in aio and io-uring

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Message-ID: <f9b820af-2b23-7bb4-f651-e6e1b3002ebf@lightnvm.io>
Date:   Thu, 18 Jun 2020 10:32:00 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     Javier González <javier@...igon.com>
Cc:     Kanchan Joshi <joshi.k@...sung.com>, axboe@...nel.dk,
        viro@...iv.linux.org.uk, bcrl@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-aio@...ck.org, io-uring@...r.kernel.org,
        linux-block@...r.kernel.org, selvakuma.s1@...sung.com,
        nj.shetty@...sung.com, Damien Le Moal <Damien.LeMoal@....com>,
        Keith Busch <keith.busch@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 0/3] zone-append support in aio and io-uring

On 18/06/2020 10.27, Javier González wrote:
> On 18.06.2020 10:04, Matias Bjørling wrote:
>> On 17/06/2020 19.23, Kanchan Joshi wrote:
>>> This patchset enables issuing zone-append using aio and io-uring 
>>> direct-io interface.
>>>
>>> For aio, this introduces opcode IOCB_CMD_ZONE_APPEND. Application 
>>> uses start LBA
>>> of the zone to issue append. On completion 'res2' field is used to 
>>> return
>>> zone-relative offset.
>>>
>>> For io-uring, this introduces three opcodes: 
>>> IORING_OP_ZONE_APPEND/APPENDV/APPENDV_FIXED.
>>> Since io_uring does not have aio-like res2, cqe->flags are 
>>> repurposed to return zone-relative offset
>>
>> Please provide a pointers to applications that are updated and ready 
>> to take advantage of zone append.
>
> Good point. We are posting a RFC with fio support for append. We wanted
> to start the conversation here before.
>
> We can post a fork for improve the reviews in V2.

Christoph's response points that it is not exactly clear how this 
matches with the POSIX API.

fio support is great - but I was thinking along the lines of 
applications that not only benchmark performance. fio should be part of 
the supported applications, but should not be the sole reason the API is 
added.