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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 97219a0bb280..cbb1bd1e020c 100644
--- 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;