ordered_tree_search
node = ordered_tree_search(inode, file_offset);
node = ordered_tree_search(inode, cur);
node = ordered_tree_search(inode, file_offset);
node = ordered_tree_search(inode, file_offset);
node = ordered_tree_search(inode, file_offset);
node = ordered_tree_search(inode, file_offset + len);