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

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Date:	Tue, 23 Sep 2014 19:28:04 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Chris J Arges <chris.j.arges@...onical.com>
Cc:	hch@...radead.org, 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

>>>>> "Chris" == Chris J Arges <chris.j.arges@...onical.com> writes:

Chris> 1) Does this workaround make sense? Perhaps there is an easier
Chris>    way?

One option is to ship a udev rule that disables write same on VMware
disks. However, I don't have a fundamental problem having a workaround
for this in the kernel.

Chris> 2) Do we expect changing max_write_same_blocks at the scsi_disk
Chris>    level to propagate the right write_same flags to other layers
Chris>    such as dm?

No, there's currently no way to communicate that the underlying topology
has changed.

-- 
Martin K. Petersen	Oracle Linux Engineering
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