lookup_noperm_unlocked
target = lookup_noperm_unlocked(&QSTR(new_name), rd.new_parent);
lower_dentry = lookup_noperm_unlocked(&qname, lower_dir_dentry);
d = lookup_noperm_unlocked(&last, parent_path.dentry);
EXPORT_SYMBOL(lookup_noperm_unlocked);
ret = lookup_noperm_unlocked(name, base);
d = lookup_noperm_unlocked(&last, path->dentry);
extern struct dentry *lookup_noperm_unlocked(struct qstr *, struct dentry *);