RE: [PATCH 4/4] Drivers: scsi: storvsc: Force SPC-3 compliance on win8 and win8 r2 hosts

[Long Li]

> -----Original Message-----
> From: devel [mailto:driverdev-devel-bounces@xxxxxxxxxxxxxxxxxxxxxx] On
> Behalf Of K. Y. Srinivasan
> Sent: Tuesday, December 16, 2014 1:22 PM
> To: gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxxxx; ohering@xxxxxxxx;
> jbottomley@xxxxxxxxxxxxx; hch@xxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx
> Subject: [PATCH 4/4] Drivers: scsi: storvsc: Force SPC-3 compliance on win8
> and win8 r2 hosts
> 
> On win8 and win8 r2 hosts force SPC-3 compliance for MSFT virtual disks.
> Ubuntu has been carrying a similar patch outside the tree for a while now.
> Starting with win10, the host will support SPC-3 compliance. Based on all the
> testing that has been done on win8 and win8 r2 hosts, we are comfortable
> claiming SPC-3 compliance on these hosts as well. This will enable TRIM
> support on these hosts.
> 
> Suggested by: James Bottomley
> <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Reviewed-by: Long Li <longli@xxxxxxxxxxxxx>
> ---
>  drivers/scsi/storvsc_drv.c |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index
> fdc5164..7487e07 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -1468,6 +1468,19 @@ static int storvsc_device_configure(struct
> scsi_device *sdevice)
>  	 */
>  	sdevice->sdev_bflags |= msft_blist_flags;
> 
> +	/*
> +	 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
> +	 * if the device is a MSFT virtual device.
> +	 */
> +	if (!strncmp(sdevice->vendor, "Msft", 4)) {
> +		switch (vmbus_proto_version) {
> +		case VERSION_WIN8:
> +		case VERSION_WIN8_1:
> +			sdevice->scsi_level = SCSI_SPC_3;
> +			break;
> +		}
> +	}
> +
>  	return 0;
>  }
> 
> --
> 1.7.4.1
> 
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