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

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Message-ID: <yq1vblhbmcv.fsf@sermon.lab.mkp.net>
Date:	Thu, 11 Dec 2014 22:03:44 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Long Li <longli@...rosoft.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"JBottomley\@parallels.com" <JBottomley@...allels.com>,
	"linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>,
	"devel\@linuxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-kernel\@vger.kernel.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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