[PATCH 4/6] xfs: zeroing space needs to punch delalloc blocks

[Christoph Hellwig]

On Thu, Apr 10, 2014 at 03:00:51PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> When we are zeroing space andit is covered by a delalloc range, we
> need to punch the delalloc range out before we truncate the page
> cache. Failing to do so leaves and inconsistency between the page
> cache and the extent tree, which we later trip over when doing
> direct IO over the same range.

Looks good.

Which test found this?

> @@ -1432,9 +1434,18 @@ xfs_zero_file_space(
>  	ASSERT(end_boundary <= offset + len);
>  
>  	if (start_boundary < end_boundary - 1) {
> -		/* punch out the page cache over the conversion range */
> +		/*
> +		 * punch out delayed allocation blocks and the page cache over
> +		 * the conversion range
> +		 */
> +		xfs_ilock(ip, XFS_ILOCK_EXCL);
> +		error = xfs_bmap_punch_delalloc_range(ip,
> +				XFS_B_TO_FSB(mp, start_boundary),

Shouldn't this be XFS_B_TO_FSBT?