From f7b7c06f386c5e990acb87a8bc96137b9f978977 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Fri, 13 Feb 2015 22:49:38 +0000
Subject: [PATCH] target: Fail I/O with PROTECT bit when protection is
 unsupported

This patch adds an explicit check for WRPROTECT + RDPROTECT bit usage
within sbc_check_prot(), and fails with TCM_INVALID_CDB_FIELD if the
backend device does not have protection enabled.

Also, update sbc_check_prot() to return sense_reason_t in order to
propigate up the correct sense ASQ.

Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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