From d397a445f43c7ae9b35260f236a08d5b5760de3d Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@daterainc.com>
Date: Thu, 22 Aug 2013 14:17:20 -0700
Subject: target: Add Third Party Copy (3PC) bit in INQUIRY response

This patch adds the Third Party Copy (3PC) bit to signal support
for EXTENDED_COPY within standard inquiry response data.

Also add emulate_3pc device attribute in configfs (enabled by default)
to allow the exposure of this bit to be disabled, if necessary.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Zach Brown <zab@redhat.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
---
 drivers/target/target_core_spc.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'drivers/target/target_core_spc.c')

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 894e83bc223d..566dd2794679 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -95,6 +95,12 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
 	 */
 	spc_fill_alua_data(lun->lun_sep, buf);
 
+	/*
+	 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
+	 */
+	if (dev->dev_attrib.emulate_3pc)
+		buf[5] |= 0x8;
+
 	buf[7] = 0x2; /* CmdQue=1 */
 
 	snprintf(&buf[8], 8, "LIO-ORG");
-- 
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