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>
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 68a4ca6..e12bcd7 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -99,6 +99,8 @@
 #define DA_EMULATE_TPWS				0
 /* Emulation for CompareAndWrite (AtomicTestandSet) by default */
 #define DA_EMULATE_CAW				1
+/* Emulation for 3rd Party Copy (ExtendedCopy) by default */
+#define DA_EMULATE_3PC				1
 /* No Emulation for PSCSI by default */
 #define DA_EMULATE_ALUA				0
 /* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
@@ -606,6 +608,7 @@
 	int		emulate_tpu;
 	int		emulate_tpws;
 	int		emulate_caw;
+	int		emulate_3pc;
 	int		enforce_pr_isids;
 	int		is_nonrot;
 	int		emulate_rest_reord;