linux-kernel - Re: [PATCH 2/3] aio: add support for zone-append

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Message-ID: <CY4PR04MB3751B6D692F59810AF6D52D7E79B0@CY4PR04MB3751.namprd04.prod.outlook.com>
Date:   Thu, 18 Jun 2020 07:33:57 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     Kanchan Joshi <joshi.k@...sung.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "bcrl@...ck.org" <bcrl@...ck.org>
CC:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-aio@...ck.org" <linux-aio@...ck.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "selvakuma.s1@...sung.com" <selvakuma.s1@...sung.com>,
        "nj.shetty@...sung.com" <nj.shetty@...sung.com>,
        "javier.gonz@...sung.com" <javier.gonz@...sung.com>,
        Arnav Dawn <a.dawn@...sung.com>
Subject: Re: [PATCH 2/3] aio: add support for zone-append

On 2020/06/18 2:27, Kanchan Joshi wrote:
> Introduce IOCB_CMD_ZONE_APPEND opcode for zone-append. On append
> completion zone-relative offset is returned using io_event->res2.
> 
> Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
> Signed-off-by: Arnav Dawn <a.dawn@...sung.com>
> Signed-off-by: SelvaKumar S <selvakuma.s1@...sung.com>
> Signed-off-by: Nitesh Shetty <nj.shetty@...sung.com>
> Signed-off-by: Javier Gonzalez <javier.gonz@...sung.com>
> ---
>  fs/aio.c                     | 8 ++++++++
>  include/uapi/linux/aio_abi.h | 1 +
>  2 files changed, 9 insertions(+)
> 
> diff --git a/fs/aio.c b/fs/aio.c
> index 7ecddc2..8b10a55d 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -1579,6 +1579,10 @@ static int aio_write(struct kiocb *req, const struct iocb *iocb,
>  			__sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
>  			__sb_writers_release(file_inode(file)->i_sb, SB_FREEZE_WRITE);
>  		}
> +#ifdef CONFIG_BLK_DEV_ZONED
> +		if (iocb->aio_lio_opcode == IOCB_CMD_ZONE_APPEND)
> +			req->ki_flags |= IOCB_ZONE_APPEND;
> +#endif
>  		req->ki_flags |= IOCB_WRITE;
>  		aio_rw_done(req, call_write_iter(file, req, &iter));
>  	}
> @@ -1846,6 +1850,10 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
>  		return aio_fsync(&req->fsync, iocb, true);
>  	case IOCB_CMD_POLL:
>  		return aio_poll(req, iocb);
> +#ifdef CONFIG_BLK_DEV_ZONED
> +	case IOCB_CMD_ZONE_APPEND:
> +		return aio_write(&req->rw, iocb, false, compat);
> +#endif
>  	default:
>  		pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode);
>  		return -EINVAL;
> diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h
> index 8387e0a..541d96a 100644
> --- a/include/uapi/linux/aio_abi.h
> +++ b/include/uapi/linux/aio_abi.h
> @@ -43,6 +43,7 @@ enum {
>  	IOCB_CMD_NOOP = 6,
>  	IOCB_CMD_PREADV = 7,
>  	IOCB_CMD_PWRITEV = 8,
> +	IOCB_CMD_ZONE_APPEND = 9,
>  };
>  
>  /*
> 

No need for all the #ifdefs.

-- 
Damien Le Moal
Western Digital Research