| From 4089b71cc820a426d601283c92fcd4ffeb5139c2 Mon Sep 17 00:00:00 2001 |
| From: Chris J Arges <chris.j.arges@canonical.com> |
| 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@canonical.com> |
| |
| 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@mongodb.com> |
| Tested-by: Chris J Arges <chris.j.arges@canonical.com> |
| Signed-off-by: Chris J Arges <chris.j.arges@canonical.com> |
| Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> |
| Signed-off-by: Christoph Hellwig <hch@lst.de> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/message/fusion/mptspi.c | 5 +++++ |
| 1 file changed, 5 insertions(+) |
| |
| --- a/drivers/message/fusion/mptspi.c |
| +++ b/drivers/message/fusion/mptspi.c |
| @@ -1419,6 +1419,11 @@ 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 |
