linux-kernel - Re: [PATCH v4 1/6] fs: introduce FMODE_ZONE_APPEND and IOCB_ZONE

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Date:   Fri, 24 Jul 2020 10:34:30 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Kanchan Joshi <joshi.k@...sung.com>, viro@...iv.linux.org.uk,
        bcrl@...ck.org
Cc:     willy@...radead.org, hch@...radead.org, Damien.LeMoal@....com,
        asml.silence@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aio@...ck.org,
        io-uring@...r.kernel.org, linux-block@...r.kernel.org,
        linux-api@...r.kernel.org, Selvakumar S <selvakuma.s1@...sung.com>,
        Nitesh Shetty <nj.shetty@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>
Subject: Re: [PATCH v4 1/6] fs: introduce FMODE_ZONE_APPEND and
 IOCB_ZONE_APPEND

On 7/24/20 9:49 AM, Kanchan Joshi wrote:
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 6c4ab4d..ef13df4 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -175,6 +175,9 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
>  /* File does not contribute to nr_files count */
>  #define FMODE_NOACCOUNT		((__force fmode_t)0x20000000)
>  
> +/* File can support zone-append */
> +#define FMODE_ZONE_APPEND	((__force fmode_t)0x40000000)

This conflicts with the async buffered read support in linux-next that
has been queued up for a long time.

> @@ -315,6 +318,7 @@ enum rw_hint {
>  #define IOCB_SYNC		(1 << 5)
>  #define IOCB_WRITE		(1 << 6)
>  #define IOCB_NOWAIT		(1 << 7)
> +#define IOCB_ZONE_APPEND	(1 << 8)

Ditto this one, and that also clashes with mainline. The next available
bit would be 10, IOCB_WAITQ and IOCB_NOIO are 8 and 9.


-- 
Jens Axboe