linux-kernel - Re: [PATCH 2/8] Drivers: scsi: storvsc: Filter commands based on the storage protocol version

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Message-ID: <20140709084055.GB6012@infradead.org>
Date:	Wed, 9 Jul 2014 01:40:55 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	ohering@...e.com, jbottomley@...allels.com, jasowang@...hat.com,
	apw@...onical.com, linux-scsi@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH 2/8] Drivers: scsi: storvsc: Filter commands based on the
 storage protocol version

On Tue, Jul 08, 2014 at 05:46:46PM -0700, K. Y. Srinivasan wrote:
> Going forward it is possible that some of the commands that are not currently
> implemented will be implemented on future Windows hosts. Make command filtering
> depend on the host version.

> +	if (vmstor_current_major <= VMSTOR_WIN8_MAJOR) {
> +		/*
> +		 * On legacy hosts filter unimplemented commands.
> +		 */
> +		if (!storvsc_scsi_cmd_ok(scmnd)) {
> +			scmnd->scsi_done(scmnd);
> +			return 0;
> +		}

So post-Win8 versions don't need command filering as they can properly
reject commands they don't understand?  If that's the case please state
it in the patch description.

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