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    Subject[PATCH 3.13 048/105] mptfusion: enable no_write_same for vmware scsi disks
    Date
    3.13.11.10 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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: Kamal Mostafa <kamal@canonical.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 5653e50..424f51d 100644
    --- a/drivers/message/fusion/mptspi.c
    +++ b/drivers/message/fusion/mptspi.c
    @@ -1422,6 +1422,11 @@ 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
    --
    1.9.1


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