map_pos_dirent
if (!(de = map_pos_dirent(inode, &next_pos, &qbh))) {
if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);