文件上传未在文件夹codeigniter中上传

我有问题，我的orig_name文件上传成功上传到数据库中，但文件没有上传到我的文件夹中。。

这是我的控制器代码

public function insert(){
        $this->model->register();
        $this->run_upload();
        redirect('Controling/daftar');
    }
    public function run_upload(){
        $config['upload_path'] = './upload/';
        $config['allowed_types'] = 'gif|jpg|png|pdf';
        $config['max_size'] = '100000';
        $config['max_width'] = '3024';
        $config['max_heigth'] = '2024';
        $this->load->library('upload', $config);
            $data = array('upload_data' => $this->upload->data());
            $datafoto=$this->upload->data();
            $nm_file = time().$datafoto['orig_name'];
            $this->load->model('model');
            $this->model->update_file($nm_file);
            copy('upload/'.$datafoto['orig_name'], 'upload/'.$nm_file);
    }

这是我的视图代码

<?php echo form_open_multipart('Controling/insert', 'form="form"')?>
        <h2 class="">Register</h2>
        <label>Nim</label><input type="text" name="nim" class="form-control"><br />
        <label>Username</label><input type="text" name="username" class="form-control"><br />
        <label>Password</label><input type="password" name="password" class="form-control"><br />
        <label>Masukkan File</label>
        <input type="file" name="userfile" size="20" class="form-control"><br />
        <input class="btn btn-primary" type="submit" name="register" value="Daftar">
    <?php echo form_close(); ?>