This is a note to let you know that I've just added the patch titled
mptfusion: enable no_write_same for vmware scsi disks
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mptfusion-enable-no_write_same-for-vmware-scsi-disks.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4089b71cc820a426d601283c92fcd4ffeb5139c2 Mon Sep 17 00:00:00 2001
From: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx>
Date: Tue, 23 Sep 2014 09:22:25 -0500
Subject: mptfusion: enable no_write_same for vmware scsi disks
From: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx>
commit 4089b71cc820a426d601283c92fcd4ffeb5139c2 upstream.
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.
BugLink: http://bugs.launchpad.net/bugs/1371591
Reported-by: Bruce Lucas <bruce.lucas@xxxxxxxxxxx>
Tested-by: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx>
Signed-off-by: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/message/fusion/mptspi.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/message/fusion/mptspi.c
+++ b/drivers/message/fusion/mptspi.c
@@ -1420,6 +1420,11 @@ mptspi_probe(struct pci_dev *pdev, const
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
Patches currently in stable-queue which might be from chris.j.arges@xxxxxxxxxxxxx are
queue-3.16/mptfusion-enable-no_write_same-for-vmware-scsi-disks.patch
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