linux-ext4 - Re: [PATCH 1/3] xfs: use ENOTBLK for direct I/O to buffered I/O fallback

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Date:   Tue, 21 Jul 2020 13:35:05 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Dave Chinner <david@...morbit.com>,
        Goldwyn Rodrigues <rgoldwyn@...e.de>,
        Damien Le Moal <damien.lemoal@....com>,
        Naohiro Aota <naohiro.aota@....com>,
        Johannes Thumshirn <jth@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        cluster-devel@...hat.com, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org
Subject: Re: [PATCH 1/3] xfs: use ENOTBLK for direct I/O to buffered I/O
 fallback

On Tue, Jul 21, 2020 at 08:31:55PM +0200, Christoph Hellwig wrote:
> This is what the classic fs/direct-io.c implementation and thuse other
> file systems use.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Looks ok to me,
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  fs/xfs/xfs_file.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index 00db81eac80d6c..a6ef90457abf97 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -505,7 +505,7 @@ xfs_file_dio_aio_write(
>  		 */
>  		if (xfs_is_cow_inode(ip)) {
>  			trace_xfs_reflink_bounce_dio_write(ip, iocb->ki_pos, count);
> -			return -EREMCHG;
> +			return -ENOTBLK;
>  		}
>  		iolock = XFS_IOLOCK_EXCL;
>  	} else {
> @@ -714,7 +714,7 @@ xfs_file_write_iter(
>  		 * allow an operation to fall back to buffered mode.
>  		 */
>  		ret = xfs_file_dio_aio_write(iocb, from);
> -		if (ret != -EREMCHG)
> +		if (ret != -ENOTBLK)
>  			return ret;
>  	}
>  
> -- 
> 2.27.0
>