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

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Message-ID: <f503c488-fa00-4fe2-1ceb-7093ea429e45@lightnvm.io>
Date:   Thu, 18 Jun 2020 10:04:32 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     Kanchan Joshi <joshi.k@...sung.com>, axboe@...nel.dk,
        viro@...iv.linux.org.uk, bcrl@...ck.org
Cc:     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, javier.gonz@...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 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.

I do not believe it's beneficial at this point to change the libaio API, 
applications that would want to use this API, should anyway switch to 
use io_uring.

Please also note that applications and libraries that want to take 
advantage of zone append, can already use the zonefs file-system, as it 
will use the zone append command when applicable.

> Kanchan Joshi (1):
>    aio: add support for zone-append
>
> Selvakumar S (2):
>    fs,block: Introduce IOCB_ZONE_APPEND and direct-io handling
>    io_uring: add support for zone-append
>
>   fs/aio.c                      |  8 +++++
>   fs/block_dev.c                | 19 +++++++++++-
>   fs/io_uring.c                 | 72 +++++++++++++++++++++++++++++++++++++++++--
>   include/linux/fs.h            |  1 +
>   include/uapi/linux/aio_abi.h  |  1 +
>   include/uapi/linux/io_uring.h |  8 ++++-
>   6 files changed, 105 insertions(+), 4 deletions(-)
>