Re: [PATCH V2 1/1] Drivers: hv: Implement the file copy service

[Olaf Hering <olaf@aepfle.de>]

On Tue, Jan 14, K. Y. Srinivasan wrote:


> +static ssize_t fcopy_write(struct file *file, const char __user *buf,
> +			size_t count, loff_t *ppos)
> +{
> +	int error = 0;
> +
> +	if (count != sizeof(int))
> +		return 0;
> +
> +	if (copy_from_user(&error, buf, sizeof(int)))
> +		return -EFAULT;
> +
> +	if (in_hand_shake) {
> +		fcopy_handle_handshake();
> +		return 0;
> +	}


> +	/*
> +	 * Register with the kernel.
> +	 */
> +	write(fcopy_fd, &version, sizeof(int));


Shouldnt there be some version check already even in this initial
implementation? What if there will be a newer daemon running on an older
kernel?

Olaf