xfs_agfl_walk(
	struct xfs_mount	*mp,
	struct xfs_agf		*agf,
	struct xfs_buf		*agflbp,
	xfs_agfl_walk_fn	walk_fn,
	void			*priv)
{
	__be32			*agfl_bno;
	unsigned int		i;
	int			error;

	agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp);
	i = be32_to_cpu(agf->agf_flfirst);

	/* Nothing to walk in an empty AGFL. */
	if (agf->agf_flcount == cpu_to_be32(0))
		return 0;

	/* Otherwise, walk from first to last, wrapping as needed. */
	for (;;) {
		error = walk_fn(mp, be32_to_cpu(agfl_bno[i]), priv);
		if (error)
			return error;
		if (i == be32_to_cpu(agf->agf_fllast))
			break;
		if (++i == xfs_agfl_size(mp))
			i = 0;
	}

	return 0;
}
Unknown