linux-kernel - RE: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests

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Message-ID: <a445e81eb25f46918e85f51c631f6094@BY2PR0301MB0711.namprd03.prod.outlook.com>
Date:	Tue, 29 Jul 2014 17:41:04 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	James Bottomley <jbottomley@...allels.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@...radead.org" <hch@...radead.org>,
	"sitsofe@...il.com" <sitsofe@...il.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests



> -----Original Message-----
> From: James Bottomley [mailto:jbottomley@...allels.com]
> Sent: Monday, July 28, 2014 1:03 PM
> To: KY Srinivasan
> Cc: linux-kernel@...r.kernel.org; hch@...radead.org; sitsofe@...il.com;
> devel@...uxdriverproject.org; apw@...onical.com;
> martin.petersen@...cle.com; linux-scsi@...r.kernel.org;
> ohering@...e.com; gregkh@...uxfoundation.org; jasowang@...hat.com
> Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks tests
> 
> On Mon, 2014-07-28 at 19:05 +0000, KY Srinivasan wrote:
> >
> > > -----Original Message-----
> > > From: Martin K. Petersen [mailto:martin.petersen@...cle.com]
> > > Sent: Monday, July 28, 2014 12:03 PM
> > > To: KY Srinivasan
> > > Cc: Martin K. Petersen; Sitsofe Wheeler; Christoph Hellwig;
> > > gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> > > devel@...uxdriverproject.org; ohering@...e.com; apw@...onical.com;
> > > jasowang@...hat.com; jbottomley@...allels.com; linux-
> > > scsi@...r.kernel.org
> > > Subject: Re: [PATCH v2 3/3] [SCSI] Make LBP quirk skip lbpme checks
> > > tests
> > >
> > > >>>>> "KY" == KY Srinivasan <kys@...rosoft.com> writes:
> > >
> > > KY,
> > >
> > > KY> "At the time thin-provisioning was defined, the discovery
> > > KY> information was first proposed in READ CAPACITY 16 command. And
> > > then
> > > KY> moved into the new dedicated VPD page - B2h. You can see the
> > > KY> information reported in this VPD page is richer than READ
> > > KY> CAPACITY
> > > KY> 16 command. As this transition happened during we added the
> > > KY> feature, Windows uses the newer method that based on VPD page
> > > KY> B2h. It looks Linux tries to use both new and old method which is
> weird to me."
> > >
> > > The READ CAPACITY(16) response is not optional.
> >
> > Ok; that settles the issue then. I will attempt to get it fixed on Windows.
> 
> Like Martin says, this isn't optional either/or; it's mandatory to support the RC
> 16 bits.  If you don't want to get into playing the messenger between us and
> the windows guys on SCSI standards, we'd be happy to communicate
> directly, either by email or a phone meeting.

We will fix this bug in the next release of Windows; we are also looking at backporting the fix to prior versions of Windows.

Thanks,

K. Y