+static int rtrack_exclusive_open(struct file *file)
+{
+ return test_and_set_bit(0, &rtrack_unit.in_use) ? -EBUSY : 0;
+}
+
+static int rtrack_exclusive_release(struct file *file)
+{
+ clear_bit(0, &rtrack_unit.in_use);
+ return 0;
+}
+
+static const struct v4l2_file_operations rtrack_fops = {