From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] mptfusion: enable no_write_same in scsi_host_template
Date: Mon, 22 Sep 2014 11:02:20 -0700
Message-ID: <20140922180220.GA10166@infradead.org>
References: <1411408690-4766-1-git-send-email-chris.j.arges@canonical.com>
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To: Chris J Arges <chris.j.arges@canonical.com>
Cc: linux-scsi@vget.kernel.org, bruce.lucas@mongodb.com, Nagalakshmi Nandigama <nagalakshmi.nandigama@avagotech.com>, Praveen Krishnamoorthy <praveen.krishnamoorthy@avagotech.com>, Sreekanth Reddy <sreekanth.reddy@avagotech.com>, Abhijit Mahajan <abhijit.mahajan@avagotech.com>, MPT-FusionLinux.pdl@avagotech.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
List-Id: linux-scsi@vger.kernel.org

On Mon, Sep 22, 2014 at 12:56:59PM -0500, Chris J Arges wrote:
> 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.

Does this affet real hardware or is it a VMware bug?  If it's just the
latter we should simply blacklist VMware.