ufs_find_entry
de = ufs_find_entry(dir, qstr, &folio);
de = ufs_find_entry(dir, &dentry->d_name, &folio);
old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_folio);
new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_folio);
struct ufs_dir_entry *ufs_find_entry(struct inode *, const struct qstr *,