linux-kernel - [PATCH 2/4] scsi: add scsi device flag to request READ CAPACITY (16) be preferred

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Date:	Fri, 13 Sep 2013 13:58:27 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	Andy Whitcroft <apw@...onical.com>,
	Ben Howard <ben.howard@...onical.com>,
	linux-scsi@...r.kernel.org, devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] scsi: add scsi device flag to request READ CAPACITY (16) be preferred

BugLink: http://bugs.launchpad.net/bugs/1223499
Signed-off-by: Andy Whitcroft <apw@...onical.com>
---
 drivers/scsi/sd.c          | 2 ++
 include/scsi/scsi_device.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 5a8a04d..eba4d6c 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2104,6 +2104,8 @@ static int sd_try_rc16_first(struct scsi_device *sdp)
 		return 1;
 	if (scsi_device_protection(sdp))
 		return 1;
+	if (sdp->try_rc_16_first)
+		return 1;
 	return 0;
 }
 
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 9b7fdb6..df3ed43 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -165,6 +165,7 @@ struct scsi_device {
 	unsigned no_read_disc_info:1;	/* Avoid READ_DISC_INFO cmds */
 	unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
 	unsigned try_rc_10_first:1;	/* Try READ_CAPACACITY_10 first */
+	unsigned try_rc_16_first:1;	/* Try READ_CAPACACITY_16 first */
 	unsigned is_visible:1;	/* is the device visible in sysfs */
 	unsigned wce_default_on:1;	/* Cache is ON by default */
 	unsigned no_dif:1;	/* T10 PI (DIF) should be disabled */
-- 
1.8.1.2

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