linux-kernel - [PATCH] mptfusion: enable no_write_same in scsi_host

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Message-Id: <1411408690-4766-1-git-send-email-chris.j.arges@canonical.com>
Date:	Mon, 22 Sep 2014 12:56:59 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	linux-scsi@...t.kernel.org
Cc:	bruce.lucas@...godb.com,
	Chris J Arges <chris.j.arges@...onical.com>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mptfusion: enable no_write_same in scsi_host_template

When using a virtual SCSI disk in a VMWare VM if blkdev_issue_zeroout is used
data can be improperly zeroed out using the mptfusion driver. This patch
disables write_same for this driver which ensures that manual zeroing out
is used instead.

BugLink: http://bugs.launchpad.net/bugs/1371591
Reported-by: Bruce Lucas <bruce.lucas@...godb.com>
Signed-off-by: Chris J Arges <chris.j.arges@...onical.com>
---
 drivers/message/fusion/mptspi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/message/fusion/mptspi.c b/drivers/message/fusion/mptspi.c
index 787933d..2fcc9bd 100644
--- a/drivers/message/fusion/mptspi.c
+++ b/drivers/message/fusion/mptspi.c
@@ -850,6 +850,7 @@ static struct scsi_host_template mptspi_driver_template = {
 	.cmd_per_lun			= 7,
 	.use_clustering			= ENABLE_CLUSTERING,
 	.shost_attrs			= mptscsih_host_attrs,
+	.no_write_same                  = 1,
 };
 
 static int mptspi_write_spi_device_pg1(struct scsi_target *starget,
-- 
1.9.1

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