linux-kernel - Re: [PATCH 09/12] xfs: flag files as supporting buffered async reads

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Message-ID: <20200528175353.GB8204@magnolia>
Date:   Thu, 28 May 2020 10:53:53 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     io-uring@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Subject: Re: [PATCH 09/12] xfs: flag files as supporting buffered async reads

On Tue, May 26, 2020 at 01:51:20PM -0600, Jens Axboe wrote:
> XFS uses generic_file_read_iter(), which already supports this.
> 
> Signed-off-by: Jens Axboe <axboe@...nel.dk>

Er... I guess that looks ok?  Assuming you've done enough qa on
io_uring to be able to tell if this breaks anything, since touching the
mm always feels murky to me:

Acked-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  fs/xfs/xfs_file.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index 4b8bdecc3863..97f44fbf17f2 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -1080,7 +1080,7 @@ xfs_file_open(
>  		return -EFBIG;
>  	if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb)))
>  		return -EIO;
> -	file->f_mode |= FMODE_NOWAIT;
> +	file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;
>  	return 0;
>  }
>  
> -- 
> 2.26.2
>