HFS_TREE_BIGKEYS
if (node->tree->attributes & HFS_TREE_BIGKEYS)
if (node->tree->attributes & HFS_TREE_BIGKEYS) {
if (!(tree->attributes & HFS_TREE_BIGKEYS)) {
head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS);