linux-kernel - [PATCH 2/3] [SCSI] storvsc: Add Hyper-V logical block provisioning tests

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Message-ID: <20140724075653.GC15127@sucs.org>
Date:	Thu, 24 Jul 2014 08:56:53 +0100
From:	Sitsofe Wheeler <sitsofe@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	ohering@...e.com, apw@...onical.com, jasowang@...hat.com,
	jbottomley@...allels.com, hch@...radead.org,
	linux-scsi@...r.kernel.org
Subject: [PATCH 2/3] [SCSI] storvsc: Add Hyper-V logical block provisioning
 tests

Microsoft Hyper-V targets currently only claim SPC-2 compliance / no
compliance indicated even though they implement post SPC-2 features
which means those features are not tested for. Add a blacklist flag to
Hyper-V devices that forces said testing.

See https://lkml.org/lkml/2014/7/21/627 for the previous version of this
patch and https://lkml.org/lkml/2014/7/23/615 for example devices.

Original-patch-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Sitsofe Wheeler <sitsofe@...oo.com>
---
 drivers/scsi/storvsc_drv.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 5ad2810..88b7173 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -326,8 +326,6 @@ MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
  */
 static int storvsc_timeout = 180;
 
-static int msft_blist_flags = BLIST_TRY_VPD_PAGES;
-
 #define STORVSC_MAX_IO_REQUESTS				200
 
 static void storvsc_on_channel_callback(void *context);
@@ -1444,12 +1442,10 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
 	sdevice->no_write_same = 1;
 
 	/*
-	 * Add blist flags to permit the reading of the VPD pages even when
-	 * the target may claim SPC-2 compliance. MSFT targets currently
-	 * claim SPC-2 compliance while they implement post SPC-2 features.
-	 * With this patch we can correctly handle WRITE_SAME_16 issues.
+	 * Forcefully enable logical block provisioning testing.
 	 */
-	sdevice->sdev_bflags |= msft_blist_flags;
+	sdevice->sdev_bflags |= BLIST_TRY_LBP;
+	sdevice->try_lbp = 1;
 
 	return 0;
 }
-- 
1.9.3
--
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