linux-kernel - RE: [PATCH 4/8] Drivers: scsi: storvsc: Filter WRITE_SAME

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Date:	Wed, 9 Jul 2014 19:52:54 +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 4/8] Drivers: scsi: storvsc: Filter WRITE_SAME_16



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Wednesday, July 9, 2014 1:43 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 4/8] Drivers: scsi: storvsc: Filter WRITE_SAME_16
> 
> On Tue, Jul 08, 2014 at 05:46:48PM -0700, K. Y. Srinivasan wrote:
> > Host does not handle WRITE_SAME_16; filter this command out. This
> > patch is required to handle large devices (greater than 2 TB disks).
> 
> Storvsc already sets the no_write_same flag, where is the command coming
> from?

In spite of this flag,  I see WRITE_SAME_16 being issued when I format a device bigger than 2 TB;
I tried both xfs and ext4. Windows hosts currently do not handle unsupported commands correctly -
The information returned is not sufficient to effect recovery in the Linux guest. While this may be addressed in
future hosts, this patch fixes the problem.

K. Y
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