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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@HansenPartnership.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
K. Y. Srinivasan 2014-12-16 13:21:45 -08:00 committed by Christoph Hellwig
parent 0fb8db29f2
commit b0a93d96b2
1 changed files with 13 additions and 0 deletions
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13
drivers/scsi/storvsc_drv.c
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@ -1394,6 +1394,19 @@ 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;
}