pnfs_calc_offset_end
end1 = pnfs_calc_offset_end(l1->offset, l1->length);
end2 = pnfs_calc_offset_end(l2->offset, l2->length);
old_end = pnfs_calc_offset_end(old->pls_range.offset,
new_end = pnfs_calc_offset_end(new->pls_range.offset,