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.lu...@mongodb.com> Tested-by: Chris J Arges <chris.j.ar...@canonical.com> Signed-off-by: Chris J Arges <chris.j.ar...@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 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 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
