[PATCH 6/8] xfs: add DAX truncate support

[Brian Foster]

On Tue, Mar 24, 2015 at 09:51:04PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> When we truncate a DAX file, we need to call through the DAX page
> truncation path rather than through block_truncate_page() so that
> mappings and block zeroing are all handled correctly. Otherwise,
> truncate does not need to change.
> 
> Signed-off-by: Dave Chinner <dchinner at redhat.com>
> ---

Reviewed-by: Brian Foster <bfoster at redhat.com>

>  fs/xfs/xfs_iops.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index 8b9e688..9ca5352 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -851,7 +851,11 @@ xfs_setattr_size(
>  	 * to hope that the caller sees ENOMEM and retries the truncate
>  	 * operation.
>  	 */
> -	error = block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
> +	if (IS_DAX(inode))
> +		error = dax_truncate_page(inode, newsize, xfs_get_blocks_dax);
> +	else
> +		error = block_truncate_page(inode->i_mapping, newsize,
> +					    xfs_get_blocks);
>  	if (error)
>  		return error;
>  	truncate_setsize(inode, newsize);
> -- 
> 2.0.0
> 
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