From 0123a9ec6a4fea20d5afea90c9b47fb73fb1bc34 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@daterainc.com>
Date: Tue, 20 Aug 2013 14:24:09 -0700
Subject: target: Add MAXIMUM COMPARE AND WRITE LENGTH in Block Limits VPD

This patch adds the MAXIMUM COMPARE AND WRITE LENGTH bit, currently
hardcoded to a single logical block (NoLB=1) within the Block Limits
VPD in spc_emulate_evpd_b0().

Also add emulate_caw 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: 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 | 5 +++++
 1 file changed, 5 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 4cb667d720a7..ed7077a67d7b 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -457,6 +457,11 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 
 	/* Set WSNZ to 1 */
 	buf[4] = 0x01;
+	/*
+	 * Set MAXIMUM COMPARE AND WRITE LENGTH
+	 */
+	if (dev->dev_attrib.emulate_caw)
+		buf[5] = 0x01;
 
 	/*
 	 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
-- 
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