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

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Message-ID: <c3b8b490725541afb2fb470a9e6d4348@BY2PR03MB299.namprd03.prod.outlook.com>
Date:	Wed, 9 Jul 2014 20:02:41 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 2/8] Drivers: scsi: storvsc: Filter commands based on the
 storage protocol version



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Wednesday, July 9, 2014 1:41 AM
> To: KY Srinivasan
> 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.

I will add the comments you have suggested.

K. Y
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