linux-kernel - Re: [PATCH v3] mptfusion: enable no_write

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Message-ID: <542191DA.7090403@canonical.com>
Date:	Tue, 23 Sep 2014 10:29:30 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	hch@...radead.org
CC:	bruce.lucas@...godb.com, adam.radford@...gotech.com,
	kashyap.desai@...gotech.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: Re: [PATCH v3] mptfusion: enable no_write_same for vmware scsi disks

On 09/23/2014 09:22 AM, 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 and the vmware subsystem_vendor which
> ensures that manual zeroing out is used instead.
> 

Please hold off on applying this, I'm pursuing a different approach to
solving this bug that may be more optimal than adding this quirk.
Thanks,
--chris j arges


> BugLink: http://bugs.launchpad.net/bugs/1371591
> Reported-by: Bruce Lucas <bruce.lucas@...godb.com>
> Tested-by: Chris J Arges <chris.j.arges@...onical.com>
> Signed-off-by: Chris J Arges <chris.j.arges@...onical.com>
> ---
>  drivers/message/fusion/mptspi.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/message/fusion/mptspi.c b/drivers/message/fusion/mptspi.c
> index 787933d..613231c 100644
> --- a/drivers/message/fusion/mptspi.c
> +++ b/drivers/message/fusion/mptspi.c
> @@ -1419,6 +1419,11 @@ mptspi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		goto out_mptspi_probe;
>          }
>  
> +	/* VMWare emulation doesn't properly implement WRITE_SAME
> +	 */
> +	if (pdev->subsystem_vendor == 0x15AD)
> +		sh->no_write_same = 1;
> +
>  	spin_lock_irqsave(&ioc->FreeQlock, flags);
>  
>  	/* Attach the SCSI Host to the IOC structure
> 
--
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