xfs: encapsulate a block of debug code

[Christoph Hellwig]

On Mon, Jul 18, 2011 at 01:14:09PM -0500, Alex Elder wrote:
> Pull into a helper function some debug-only code that validates a
> xfs_da_blkinfo structure that's been read from disk.
> 
> Signed-off-by: Alex Elder <aelder at sgi.com>
> 
> ---
>  fs/xfs/xfs_da_btree.c |   31 ++++++++++++++++++++-----------
>  1 file changed, 20 insertions(+), 11 deletions(-)
> 
> Index: b/fs/xfs/xfs_da_btree.c
> ===================================================================
> --- a/fs/xfs/xfs_da_btree.c
> +++ b/fs/xfs/xfs_da_btree.c
> @@ -692,6 +692,24 @@ xfs_da_join(xfs_da_state_t *state)
>  	return(error);
>  }
>  
> +#ifdef	DEBUG
> +static void
> +xfs_da_blkinfo_validate(struct xfs_da_blkinfo *blkinfo, __u16 level)

I'm not sure the name is a good one.  E.g. the forw/backw pointers
really rely on this node not having any siblings.  Which they shoudn't
have here, but that's not generally true of any blkinfo.

Otherwise looks fine.