- err = hp->handle_size;
- if (len < hp->handle_size)
- err = -EMSGSIZE;
- else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
- err = -EFAULT;
- mdesc_release(hp);
+ file->private_data = hp;
+
+ return 0;
+}
+
+static ssize_t mdesc_read(struct file *file, char __user *buf,
+ size_t len, loff_t *offp)
+{
+ struct mdesc_handle *hp = file->private_data;
+ unsigned char *mdesc;
+ int bytes_left, count = len;
+
+ if (*offp >= hp->handle_size)
+ return 0;
+
+ bytes_left = hp->handle_size - *offp;
+ if (count > bytes_left)
+ count = bytes_left;
+
+ mdesc = (unsigned char *)&hp->mdesc;
+ mdesc += *offp;
+ if (!copy_to_user(buf, mdesc, count)) {
+ *offp += count;
+ return count;
+ } else {
+ return -EFAULT;
+ }
+}