linux-kernel - RE: [PATCH] scsi:storvsc enable reading from VPD pages on SPC-2

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Date:	Tue, 16 Dec 2014 02:11:17 +0000
From:	Long Li <longli@...rosoft.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"JBottomley@...allels.com" <JBottomley@...allels.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] scsi:storvsc enable reading from VPD pages on SPC-2

Thanks Martin for the explanation.

I'll send out another patch.

> -----Original Message-----
> From: Martin K. Petersen [mailto:martin.petersen@...cle.com]
> Sent: Thursday, December 11, 2014 7:04 PM
> To: Long Li
> Cc: Martin K. Petersen; KY Srinivasan; Haiyang Zhang;
> JBottomley@...allels.com; linux-scsi@...r.kernel.org;
> devel@...uxdriverproject.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] scsi:storvsc enable reading from VPD pages on SPC-2
> 
> >>>>> "Long" == Long Li <longli@...rosoft.com> writes:
> 
> >> Handle the issues or handle WRITE SAME(10/16)?
> 
> Long> With this patch, the SCSI layer will be able to correctly send
> Long> WRITE_SAME_16 to the Hyper-V host. It will not send WRITE_SAME_10:
> Long> it has been disabled in the driver template. Do you want me to
> Long> send another patch with these details?
> 
> no_write_same prevents us from attempting to use WRITE SAME(10/16) to zero
> block ranges.
> 
> This is completely orthogonal to using the WRITE SAME(10/16) commands with
> the UNMAP bit set to discard block ranges. The latter is controlled by the logical
> block provisioning heuristics and is not affected by no_write_same at all.
> 
> --
> Martin K. Petersen	Oracle Linux Engineering
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