linux-ext4 - Re: [PATCH 24/29] xfs: use xfs_direct_write_iomap

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Date:   Tue, 23 Nov 2021 15:02:22 -0800
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, dm-devel@...hat.com,
        linux-xfs@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 24/29] xfs: use xfs_direct_write_iomap_ops for DAX zeroing

On Tue, Nov 09, 2021 at 09:33:04AM +0100, Christoph Hellwig wrote:
> While the buffered write iomap ops do work due to the fact that zeroing
> never allocates blocks, the DAX zeroing should use the direct ops just
> like actual DAX I/O.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Heh.  I've wanted to fix this for a long time, but I like your
surrounding cleanups better than anything I had time to work on. :)

Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/xfs/xfs_iomap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
> index 8cef3b68cba78..704292c6ce0c7 100644
> --- a/fs/xfs/xfs_iomap.c
> +++ b/fs/xfs/xfs_iomap.c
> @@ -1324,7 +1324,7 @@ xfs_zero_range(
>  
>  	if (IS_DAX(inode))
>  		return dax_zero_range(inode, pos, len, did_zero,
> -				      &xfs_buffered_write_iomap_ops);
> +				      &xfs_direct_write_iomap_ops);
>  	return iomap_zero_range(inode, pos, len, did_zero,
>  				&xfs_buffered_write_iomap_ops);
>  }
> @@ -1339,7 +1339,7 @@ xfs_truncate_page(
>  
>  	if (IS_DAX(inode))
>  		return dax_truncate_page(inode, pos, did_zero,
> -					&xfs_buffered_write_iomap_ops);
> +					&xfs_direct_write_iomap_ops);
>  	return iomap_truncate_page(inode, pos, did_zero,
>  				   &xfs_buffered_write_iomap_ops);
>  }
> -- 
> 2.30.2
>