linux-kernel - [PATCH V2 6/7] scsi: storvsc: Allow write

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Date:	Wed,  3 Jun 2015 15:34:31 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, ohering@...e.com,
	jbottomley@...allels.com, hch@...radead.org,
	linux-scsi@...r.kernel.org, apw@...onical.com, vkuznets@...hat.com,
	jasowang@...hat.com
Cc:	Keith Mange <keith.mange@...rosoft.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V2 6/7] scsi: storvsc: Allow write_same when host is windows 10

From: Keith Mange <keith.mange@...rosoft.com>

Allow WRITE_SAME for Windows10 and above hosts.

Tested-by: Alex Ng <alexng@...rosoft.com>
Signed-off-by: Keith Mange <keith.mange@...rosoft.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/scsi/storvsc_drv.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 58fa47a..021cbdf 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1488,7 +1488,8 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
 
 	/*
 	 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
-	 * if the device is a MSFT virtual device.
+	 * if the device is a MSFT virtual device.  If the host is
+	 * WIN10 or newer, allow write_same.
 	 */
 	if (!strncmp(sdevice->vendor, "Msft", 4)) {
 		switch (vmstor_proto_version) {
@@ -1497,6 +1498,9 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
 			sdevice->scsi_level = SCSI_SPC_3;
 			break;
 		}
+
+		if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10)
+			sdevice->no_write_same = 0;
 	}
 
 	return 0;
-- 
1.7.4.1

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