Re: [PATCH v2 2/5] fs, xfs: introduce FALLOC_FL_SEAL_BLOCK_MAP

Dave Chinner
2017-08-04T23:29:30Z

On Thu, Aug 03, 2017 at 07:28:17PM -0700, Dan Williams wrote:
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index fe0f8f7f4bb7..46d8eb9e19fc 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -1393,6 +1393,107 @@ xfs_zero_file_space(
>
> }
>
> +/* Return 1 if hole detected, 0 if not, and < 0 if fail to determine */
> +STATIC int
> +xfs_file_has_holes(
> + struct xfs_inode *ip)
> +{

Why do we need this function?

We've just run xfs_alloc_file_space() across the entire range we
are sealing, so we've already guaranteed that it won't have holes
in it.

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com