From: Andy Whitcroft <apw@canonical.com>
To: "James E.J. Bottomley" <JBottomley@parallels.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>
Cc: Andy Whitcroft <apw@canonical.com>,
Ben Howard <ben.howard@canonical.com>,
linux-scsi@vger.kernel.org, devel@linuxdriverproject.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 2/4] scsi: add scsi device flag to request READ CAPACITY (16) be preferred
Date: Fri, 13 Sep 2013 13:58:27 +0100 [thread overview]
Message-ID: <1379077109-29606-3-git-send-email-apw@canonical.com> (raw)
In-Reply-To: <1379077109-29606-1-git-send-email-apw@canonical.com>
BugLink: http://bugs.launchpad.net/bugs/1223499
Signed-off-by: Andy Whitcroft <apw@canonical.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
next prev parent reply other threads:[~2013-09-13 12:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-13 12:58 [PATCH 0/4] Hyper-V TRIM support Andy Whitcroft
2013-09-13 12:58 ` [PATCH 1/4] scsi: add scsi device flag to request VPD pages be used at SPC-2 Andy Whitcroft
2013-09-13 12:58 ` Andy Whitcroft [this message]
2013-09-13 12:58 ` [PATCH 3/4] scsi: hyper-v storage -- mark as VPD capable " Andy Whitcroft
2013-09-13 12:58 ` [PATCH 4/4] scsi: hyper-v storage -- mark as preferring READ CAPACITY (16) " Andy Whitcroft
2013-09-13 14:57 ` [PATCH 0/4] Hyper-V TRIM support James Bottomley
2013-09-13 15:40 ` Andy Whitcroft
2013-09-13 15:40 ` Douglas Gilbert
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