f2fs_setup_filename
err = f2fs_setup_filename(dir, child, 1, &fname);
err = f2fs_setup_filename(dir, name, 0, &fname);
int f2fs_setup_filename(struct inode *dir, const struct qstr *iname,
err = f2fs_setup_filename(dir, &dentry->d_name, 0, &fname);
err = f2fs_setup_filename(old_dir, &old_dentry->d_name,