storvsc: Allow write_same when host is windows 10

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>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 97219a0bb2803d0c14db2d9341a40a35291c2d4b..cbb1bd1e020c4b3e141a2b2ac8744d221c5c9d5e 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1480,7 +1480,8 @@ 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) {
@@ -1489,6 +1490,9 @@ 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;