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    Subject[PATCH 6/6] scsi: storvsc: Allow write_same when host is windows 10
    Date
    From: keith.mange@microsoft.com <keith.mange@microsoft.com>

    Allow WRITE_SAME for Windows10 and above hosts.

    Tested-by: Alex Ng <alexng@microsoft.com>
    Signed-off-by: Keith Mange <keith.mange@microsoft.com>
    Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
    ---
    drivers/scsi/storvsc_drv.c | 6 +++++-
    1 files changed, 5 insertions(+), 1 deletions(-)

    diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
    index 58fa47a..021cbdf 100644
    --- a/drivers/scsi/storvsc_drv.c
    +++ b/drivers/scsi/storvsc_drv.c
    @@ -1488,7 +1488,8 @@ static int storvsc_device_configure(struct scsi_device *sdevice)

    /*
    * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
    - * if the device is a MSFT virtual device.
    + * if the device is a MSFT virtual device. If the host is
    + * WIN10 or newer, allow write_same.
    */
    if (!strncmp(sdevice->vendor, "Msft", 4)) {
    switch (vmstor_proto_version) {
    @@ -1497,6 +1498,9 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
    sdevice->scsi_level = SCSI_SPC_3;
    break;
    }
    +
    + if (vmstor_proto_version >= VMSTOR_PROTO_VERSION_WIN10)
    + sdevice->no_write_same = 0;
    }

    return 0;
    --
    1.7.4.1


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