tree_update_change
tree_update_change(ne, connect_point, &vis_head->vis_change);
tree_update_change(ne, connect_point,
tree_update_change(ne, ne->ns_root, &now);
tree_update_change(ne, connect_point, NULL);
tree_update_change(ne, exi->exi_tree, NULL);
tree_update_change(ne, exi->exi_tree, NULL);
extern void tree_update_change(nfs_export_t *, treenode_t *, timespec_t *);