[SCSI] target: Add LIO target core v4.0.0-rc6

LIO target is a full featured in-kernel target framework with the
following feature set:

High-performance, non-blocking, multithreaded architecture with SIMD
support.

Advanced SCSI feature set:

    * Persistent Reservations (PRs)
    * Asymmetric Logical Unit Assignment (ALUA)
    * Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S)
    * Full Error Recovery (ERL=0,1,2)
    * Active/active task migration and session continuation (ERL=2)
    * Thin LUN provisioning (UNMAP and WRITE_SAMExx)

Multiprotocol target plugins

Storage media independence:

    * Virtualization of all storage media; transparent mapping of IO to LUNs
    * No hard limits on number of LUNs per Target; maximum LUN size ~750 TB
    * Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc.

Standards compliance:

    * Full compliance with IETF (RFC 3720)
    * Full implementation of SPC-4 PRs and ALUA

Significant code cleanups done by Christoph Hellwig.

[jejb: fix up for new block bdev exclusive interface. Minor fixes from
 Randy Dunlap and Dan Carpenter.]
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

30 files changed, 27419 insertions, 0 deletions

diff --git a/drivers/target/Kconfig b/drivers/target/Kconfig
new file mode 100644
index 0000000..2fac3be
--- /dev/null
+++ b/drivers/target/Kconfig
@@ -0,0 +1,32 @@
+
+menuconfig TARGET_CORE
+	tristate "Generic Target Core Mod (TCM) and ConfigFS Infrastructure"
+	depends on SCSI && BLOCK
+	select CONFIGFS_FS
+	default n
+	help
+	Say Y or M here to enable the TCM Storage Engine and ConfigFS enabled
+	control path for target_core_mod.  This includes built-in TCM RAMDISK
+	subsystem logic for virtual LUN 0 access
+
+if TARGET_CORE
+
+config TCM_IBLOCK
+	tristate "TCM/IBLOCK Subsystem Plugin for Linux/BLOCK"
+	help
+	Say Y here to enable the TCM/IBLOCK subsystem plugin for non-buffered
+	access to Linux/Block devices using BIO
+
+config TCM_FILEIO
+	tristate "TCM/FILEIO Subsystem Plugin for Linux/VFS"
+	help
+	Say Y here to enable the TCM/FILEIO subsystem plugin for buffered
+	access to Linux/VFS struct file or struct block_device
+
+config TCM_PSCSI
+	tristate "TCM/pSCSI Subsystem Plugin for Linux/SCSI"
+	help
+	Say Y here to enable the TCM/pSCSI subsystem plugin for non-buffered
+	passthrough access to Linux/SCSI device
+
+endif
diff --git a/drivers/target/Makefile b/drivers/target/Makefile
new file mode 100644
index 0000000..5cfd708
--- /dev/null
+++ b/drivers/target/Makefile
@@ -0,0 +1,24 @@
+EXTRA_CFLAGS += -I$(srctree)/drivers/target/ -I$(srctree)/drivers/scsi/
+
+target_core_mod-y		:= target_core_configfs.o \
+				   target_core_device.o \
+				   target_core_fabric_configfs.o \
+				   target_core_fabric_lib.o \
+				   target_core_hba.o \
+				   target_core_pr.o \
+				   target_core_alua.o \
+				   target_core_scdb.o \
+				   target_core_tmr.o \
+				   target_core_tpg.o \
+				   target_core_transport.o \
+				   target_core_cdb.o \
+				   target_core_ua.o \
+				   target_core_rd.o \
+				   target_core_mib.o
+
+obj-$(CONFIG_TARGET_CORE)	+= target_core_mod.o
+
+# Subsystem modules
+obj-$(CONFIG_TCM_IBLOCK)	+= target_core_iblock.o
+obj-$(CONFIG_TCM_FILEIO)	+= target_core_file.o
+obj-$(CONFIG_TCM_PSCSI)		+= target_core_pscsi.o
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
new file mode 100644
index 0000000..2c5fcfe
--- /dev/null
+++ b/drivers/target/target_core_alua.c
@@ -0,0 +1,1991 @@
+/*******************************************************************************
+ * Filename:  target_core_alua.c
+ *
+ * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
+ *
+ * Copyright (c) 2009-2010 Rising Tide Systems
+ * Copyright (c) 2009-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/configfs.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_alua.h"
+#include "target_core_hba.h"
+#include "target_core_ua.h"
+
+static int core_alua_check_transition(int state, int *primary);
+static int core_alua_set_tg_pt_secondary_state(
+		struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
+		struct se_port *port, int explict, int offline);
+
+/*
+ * REPORT_TARGET_PORT_GROUPS
+ *
+ * See spc4r17 section 6.27
+ */
+int core_emulate_report_target_port_groups(struct se_cmd *cmd)
+{
+	struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_dev;
+	struct se_port *port;
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first
+				    Target port group descriptor */
+
+	spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->tg_pt_gps_list,
+			tg_pt_gp_list) {
+		/*
+		 * PREF: Preferred target port bit, determine if this
+		 * bit should be set for port group.
+		 */
+		if (tg_pt_gp->tg_pt_gp_pref)
+			buf[off] = 0x80;
+		/*
+		 * Set the ASYMMETRIC ACCESS State
+		 */
+		buf[off++] |= (atomic_read(
+			&tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
+		/*
+		 * Set supported ASYMMETRIC ACCESS State bits
+		 */
+		buf[off] = 0x80; /* T_SUP */
+		buf[off] |= 0x40; /* O_SUP */
+		buf[off] |= 0x8; /* U_SUP */
+		buf[off] |= 0x4; /* S_SUP */
+		buf[off] |= 0x2; /* AN_SUP */
+		buf[off++] |= 0x1; /* AO_SUP */
+		/*
+		 * TARGET PORT GROUP
+		 */
+		buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
+		buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
+
+		off++; /* Skip over Reserved */
+		/*
+		 * STATUS CODE
+		 */
+		buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
+		/*
+		 * Vendor Specific field
+		 */
+		buf[off++] = 0x00;
+		/*
+		 * TARGET PORT COUNT
+		 */
+		buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
+		rd_len += 8;
+
+		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+		list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
+				tg_pt_gp_mem_list) {
+			port = tg_pt_gp_mem->tg_pt;
+			/*
+			 * Start Target Port descriptor format
+			 *
+			 * See spc4r17 section 6.2.7 Table 247
+			 */
+			off += 2; /* Skip over Obsolete */
+			/*
+			 * Set RELATIVE TARGET PORT IDENTIFIER
+			 */
+			buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
+			buf[off++] = (port->sep_rtpi & 0xff);
+			rd_len += 4;
+		}
+		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+	}
+	spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	/*
+	 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
+	 */
+	buf[0] = ((rd_len >> 24) & 0xff);
+	buf[1] = ((rd_len >> 16) & 0xff);
+	buf[2] = ((rd_len >> 8) & 0xff);
+	buf[3] = (rd_len & 0xff);
+
+	return 0;
+}
+
+/*
+ * SET_TARGET_PORT_GROUPS for explict ALUA operation.
+ *
+ * See spc4r17 section 6.35
+ */
+int core_emulate_set_target_port_groups(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_dev;
+	struct se_port *port, *l_port = SE_LUN(cmd)->lun_sep;
+	struct se_node_acl *nacl = SE_SESS(cmd)->se_node_acl;
+	struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	unsigned char *ptr = &buf[4]; /* Skip over RESERVED area in header */
+	u32 len = 4; /* Skip over RESERVED area in header */
+	int alua_access_state, primary = 0, rc;
+	u16 tg_pt_id, rtpi;
+
+	if (!(l_port))
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	/*
+	 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
+	 * for the local tg_pt_gp.
+	 */
+	l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
+	if (!(l_tg_pt_gp_mem)) {
+		printk(KERN_ERR "Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
+		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+	}
+	spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
+	if (!(l_tg_pt_gp)) {
+		spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
+		printk(KERN_ERR "Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
+		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+	}
+	rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA);
+	spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
+
+	if (!(rc)) {
+		printk(KERN_INFO "Unable to process SET_TARGET_PORT_GROUPS"
+				" while TPGS_EXPLICT_ALUA is disabled\n");
+		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+	}
+
+	while (len < cmd->data_length) {
+		alua_access_state = (ptr[0] & 0x0f);
+		/*
+		 * Check the received ALUA access state, and determine if
+		 * the state is a primary or secondary target port asymmetric
+		 * access state.
+		 */
+		rc = core_alua_check_transition(alua_access_state, &primary);
+		if (rc != 0) {
+			/*
+			 * If the SET TARGET PORT GROUPS attempts to establish
+			 * an invalid combination of target port asymmetric
+			 * access states or attempts to establish an
+			 * unsupported target port asymmetric access state,
+			 * then the command shall be terminated with CHECK
+			 * CONDITION status, with the sense key set to ILLEGAL
+			 * REQUEST, and the additional sense code set to INVALID
+			 * FIELD IN PARAMETER LIST.
+			 */
+			return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		}
+		rc = -1;
+		/*
+		 * If the ASYMMETRIC ACCESS STATE field (see table 267)
+		 * specifies a primary target port asymmetric access state,
+		 * then the TARGET PORT GROUP OR TARGET PORT field specifies
+		 * a primary target port group for which the primary target
+		 * port asymmetric access state shall be changed. If the
+		 * ASYMMETRIC ACCESS STATE field specifies a secondary target
+		 * port asymmetric access state, then the TARGET PORT GROUP OR
+		 * TARGET PORT field specifies the relative target port
+		 * identifier (see 3.1.120) of the target port for which the
+		 * secondary target port asymmetric access state shall be
+		 * changed.
+		 */
+		if (primary) {
+			tg_pt_id = ((ptr[2] << 8) & 0xff);
+			tg_pt_id |= (ptr[3] & 0xff);
+			/*
+			 * Locate the matching target port group ID from
+			 * the global tg_pt_gp list
+			 */
+			spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+			list_for_each_entry(tg_pt_gp,
+					&T10_ALUA(su_dev)->tg_pt_gps_list,
+					tg_pt_gp_list) {
+				if (!(tg_pt_gp->tg_pt_gp_valid_id))
+					continue;
+
+				if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
+					continue;
+
+				atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
+				smp_mb__after_atomic_inc();
+				spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+
+				rc = core_alua_do_port_transition(tg_pt_gp,
+						dev, l_port, nacl,
+						alua_access_state, 1);
+
+				spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+				atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
+				smp_mb__after_atomic_dec();
+				break;
+			}
+			spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+			/*
+			 * If not matching target port group ID can be located
+			 * throw an exception with ASCQ: INVALID_PARAMETER_LIST
+			 */
+			if (rc != 0)
+				return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		} else {
+			/*
+			 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
+			 * the Target Port in question for the the incoming
+			 * SET_TARGET_PORT_GROUPS op.
+			 */
+			rtpi = ((ptr[2] << 8) & 0xff);
+			rtpi |= (ptr[3] & 0xff);
+			/*
+			 * Locate the matching relative target port identifer
+			 * for the struct se_device storage object.
+			 */
+			spin_lock(&dev->se_port_lock);
+			list_for_each_entry(port, &dev->dev_sep_list,
+							sep_list) {
+				if (port->sep_rtpi != rtpi)
+					continue;
+
+				tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+				spin_unlock(&dev->se_port_lock);
+
+				rc = core_alua_set_tg_pt_secondary_state(
+						tg_pt_gp_mem, port, 1, 1);
+
+				spin_lock(&dev->se_port_lock);
+				break;
+			}
+			spin_unlock(&dev->se_port_lock);
+			/*
+			 * If not matching relative target port identifier can
+			 * be located, throw an exception with ASCQ:
+			 * INVALID_PARAMETER_LIST
+			 */
+			if (rc != 0)
+				return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		}
+
+		ptr += 4;
+		len += 4;
+	}
+
+	return 0;
+}
+
+static inline int core_alua_state_nonoptimized(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	int nonop_delay_msecs,
+	u8 *alua_ascq)
+{
+	/*
+	 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
+	 * later to determine if processing of this cmd needs to be
+	 * temporarily delayed for the Active/NonOptimized primary access state.
+	 */
+	cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
+	cmd->alua_nonop_delay = nonop_delay_msecs;
+	return 0;
+}
+
+static inline int core_alua_state_standby(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u8 *alua_ascq)
+{
+	/*
+	 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
+	 * spc4r17 section 5.9.2.4.4
+	 */
+	switch (cdb[0]) {
+	case INQUIRY:
+	case LOG_SELECT:
+	case LOG_SENSE:
+	case MODE_SELECT:
+	case MODE_SENSE:
+	case REPORT_LUNS:
+	case RECEIVE_DIAGNOSTIC:
+	case SEND_DIAGNOSTIC:
+	case MAINTENANCE_IN:
+		switch (cdb[1]) {
+		case MI_REPORT_TARGET_PGS:
+			return 0;
+		default:
+			*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+			return 1;
+		}
+	case MAINTENANCE_OUT:
+		switch (cdb[1]) {
+		case MO_SET_TARGET_PGS:
+			return 0;
+		default:
+			*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+			return 1;
+		}
+	case REQUEST_SENSE:
+	case PERSISTENT_RESERVE_IN:
+	case PERSISTENT_RESERVE_OUT:
+	case READ_BUFFER:
+	case WRITE_BUFFER:
+		return 0;
+	default:
+		*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
+		return 1;
+	}
+
+	return 0;
+}
+
+static inline int core_alua_state_unavailable(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u8 *alua_ascq)
+{
+	/*
+	 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
+	 * spc4r17 section 5.9.2.4.5
+	 */
+	switch (cdb[0]) {
+	case INQUIRY:
+	case REPORT_LUNS:
+	case MAINTENANCE_IN:
+		switch (cdb[1]) {
+		case MI_REPORT_TARGET_PGS:
+			return 0;
+		default:
+			*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+			return 1;
+		}
+	case MAINTENANCE_OUT:
+		switch (cdb[1]) {
+		case MO_SET_TARGET_PGS:
+			return 0;
+		default:
+			*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+			return 1;
+		}
+	case REQUEST_SENSE:
+	case READ_BUFFER:
+	case WRITE_BUFFER:
+		return 0;
+	default:
+		*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
+		return 1;
+	}
+
+	return 0;
+}
+
+static inline int core_alua_state_transition(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u8 *alua_ascq)
+{
+	/*
+	 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
+	 * spc4r17 section 5.9.2.5
+	 */
+	switch (cdb[0]) {
+	case INQUIRY:
+	case REPORT_LUNS:
+	case MAINTENANCE_IN:
+		switch (cdb[1]) {
+		case MI_REPORT_TARGET_PGS:
+			return 0;
+		default:
+			*alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
+			return 1;
+		}
+	case REQUEST_SENSE:
+	case READ_BUFFER:
+	case WRITE_BUFFER:
+		return 0;
+	default:
+		*alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
+		return 1;
+	}
+
+	return 0;
+}
+
+/*
+ * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
+ * in transport_cmd_sequencer().  This function is assigned to
+ * struct t10_alua *->state_check() in core_setup_alua()
+ */
+static int core_alua_state_check_nop(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u8 *alua_ascq)
+{
+	return 0;
+}
+
+/*
+ * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer().
+ * This function is assigned to struct t10_alua *->state_check() in
+ * core_setup_alua()
+ *
+ * Also, this function can return three different return codes to
+ * signal transport_generic_cmd_sequencer()
+ *
+ * return 1: Is used to signal LUN not accecsable, and check condition/not ready
+ * return 0: Used to signal success
+ * reutrn -1: Used to signal failure, and invalid cdb field
+ */
+static int core_alua_state_check(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u8 *alua_ascq)
+{
+	struct se_lun *lun = SE_LUN(cmd);
+	struct se_port *port = lun->lun_sep;
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	int out_alua_state, nonop_delay_msecs;
+
+	if (!(port))
+		return 0;
+	/*
+	 * First, check for a struct se_port specific secondary ALUA target port
+	 * access state: OFFLINE
+	 */
+	if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
+		*alua_ascq = ASCQ_04H_ALUA_OFFLINE;
+		printk(KERN_INFO "ALUA: Got secondary offline status for local"
+				" target port\n");
+		*alua_ascq = ASCQ_04H_ALUA_OFFLINE;
+		return 1;
+	}
+	 /*
+	 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
+	 * ALUA target port group, to obtain current ALUA access state.
+	 * Otherwise look for the underlying struct se_device association with
+	 * a ALUA logical unit group.
+	 */
+	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+	out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
+	nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
+	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	/*
+	 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a seperate conditional
+	 * statement so the complier knows explictly to check this case first.
+	 * For the Optimized ALUA access state case, we want to process the
+	 * incoming fabric cmd ASAP..
+	 */
+	if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
+		return 0;
+
+	switch (out_alua_state) {
+	case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
+		return core_alua_state_nonoptimized(cmd, cdb,
+					nonop_delay_msecs, alua_ascq);
+	case ALUA_ACCESS_STATE_STANDBY:
+		return core_alua_state_standby(cmd, cdb, alua_ascq);
+	case ALUA_ACCESS_STATE_UNAVAILABLE:
+		return core_alua_state_unavailable(cmd, cdb, alua_ascq);
+	case ALUA_ACCESS_STATE_TRANSITION:
+		return core_alua_state_transition(cmd, cdb, alua_ascq);
+	/*
+	 * OFFLINE is a secondary ALUA target port group access state, that is
+	 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
+	 */
+	case ALUA_ACCESS_STATE_OFFLINE:
+	default:
+		printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n",
+				out_alua_state);
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Check implict and explict ALUA state change request.
+ */
+static int core_alua_check_transition(int state, int *primary)
+{
+	switch (state) {
+	case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
+	case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
+	case ALUA_ACCESS_STATE_STANDBY:
+	case ALUA_ACCESS_STATE_UNAVAILABLE:
+		/*
+		 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
+		 * defined as primary target port asymmetric access states.
+		 */
+		*primary = 1;
+		break;
+	case ALUA_ACCESS_STATE_OFFLINE:
+		/*
+		 * OFFLINE state is defined as a secondary target port
+		 * asymmetric access state.
+		 */
+		*primary = 0;
+		break;
+	default:
+		printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", state);
+		return -1;
+	}
+
+	return 0;
+}
+
+static char *core_alua_dump_state(int state)
+{
+	switch (state) {
+	case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
+		return "Active/Optimized";
+	case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
+		return "Active/NonOptimized";
+	case ALUA_ACCESS_STATE_STANDBY:
+		return "Standby";
+	case ALUA_ACCESS_STATE_UNAVAILABLE:
+		return "Unavailable";
+	case ALUA_ACCESS_STATE_OFFLINE:
+		return "Offline";
+	default:
+		return "Unknown";
+	}
+
+	return NULL;
+}
+
+char *core_alua_dump_status(int status)
+{
+	switch (status) {
+	case ALUA_STATUS_NONE:
+		return "None";
+	case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
+		return "Altered by Explict STPG";
+	case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
+		return "Altered by Implict ALUA";
+	default:
+		return "Unknown";
+	}
+
+	return NULL;
+}
+
+/*
+ * Used by fabric modules to determine when we need to delay processing
+ * for the Active/NonOptimized paths..
+ */
+int core_alua_check_nonop_delay(
+	struct se_cmd *cmd)
+{
+	if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
+		return 0;
+	if (in_interrupt())
+		return 0;
+	/*
+	 * The ALUA Active/NonOptimized access state delay can be disabled
+	 * in via configfs with a value of zero
+	 */
+	if (!(cmd->alua_nonop_delay))
+		return 0;
+	/*
+	 * struct se_cmd->alua_nonop_delay gets set by a target port group
+	 * defined interval in core_alua_state_nonoptimized()
+	 */
+	msleep_interruptible(cmd->alua_nonop_delay);
+	return 0;
+}
+EXPORT_SYMBOL(core_alua_check_nonop_delay);
+
+/*
+ * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
+ *
+ */
+static int core_alua_write_tpg_metadata(
+	const char *path,
+	unsigned char *md_buf,
+	u32 md_buf_len)
+{
+	mm_segment_t old_fs;
+	struct file *file;
+	struct iovec iov[1];
+	int flags = O_RDWR | O_CREAT | O_TRUNC, ret;
+
+	memset(iov, 0, sizeof(struct iovec));
+
+	file = filp_open(path, flags, 0600);
+	if (IS_ERR(file) || !file || !file->f_dentry) {
+		printk(KERN_ERR "filp_open(%s) for ALUA metadata failed\n",
+			path);
+		return -ENODEV;
+	}
+
+	iov[0].iov_base = &md_buf[0];
+	iov[0].iov_len = md_buf_len;
+
+	old_fs = get_fs();
+	set_fs(get_ds());
+	ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
+	set_fs(old_fs);
+
+	if (ret < 0) {
+		printk(KERN_ERR "Error writing ALUA metadata file: %s\n", path);
+		filp_close(file, NULL);
+		return -EIO;
+	}
+	filp_close(file, NULL);
+
+	return 0;
+}
+
+/*
+ * Called with tg_pt_gp->tg_pt_gp_md_mutex held
+ */
+static int core_alua_update_tpg_primary_metadata(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	int primary_state,
+	unsigned char *md_buf)
+{
+	struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
+	struct t10_wwn *wwn = &su_dev->t10_wwn;
+	char path[ALUA_METADATA_PATH_LEN];
+	int len;
+
+	memset(path, 0, ALUA_METADATA_PATH_LEN);
+
+	len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
+			"tg_pt_gp_id=%hu\n"
+			"alua_access_state=0x%02x\n"
+			"alua_access_status=0x%02x\n",
+			tg_pt_gp->tg_pt_gp_id, primary_state,
+			tg_pt_gp->tg_pt_gp_alua_access_status);
+
+	snprintf(path, ALUA_METADATA_PATH_LEN,
+		"/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
+		config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
+
+	return core_alua_write_tpg_metadata(path, md_buf, len);
+}
+
+static int core_alua_do_transition_tg_pt(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	struct se_port *l_port,
+	struct se_node_acl *nacl,
+	unsigned char *md_buf,
+	int new_state,
+	int explict)
+{
+	struct se_dev_entry *se_deve;
+	struct se_lun_acl *lacl;
+	struct se_port *port;
+	struct t10_alua_tg_pt_gp_member *mem;
+	int old_state = 0;
+	/*
+	 * Save the old primary ALUA access state, and set the current state
+	 * to ALUA_ACCESS_STATE_TRANSITION.
+	 */
+	old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
+	atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
+			ALUA_ACCESS_STATE_TRANSITION);
+	tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
+				ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
+				ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
+	/*
+	 * Check for the optional ALUA primary state transition delay
+	 */
+	if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
+		msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
+
+	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+	list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
+				tg_pt_gp_mem_list) {
+		port = mem->tg_pt;
+		/*
+		 * After an implicit target port asymmetric access state
+		 * change, a device server shall establish a unit attention
+		 * condition for the initiator port associated with every I_T
+		 * nexus with the additional sense code set to ASYMMETRIC
+		 * ACCESS STATE CHAGED.
+		 *
+		 * After an explicit target port asymmetric access state
+		 * change, a device server shall establish a unit attention
+		 * condition with the additional sense code set to ASYMMETRIC
+		 * ACCESS STATE CHANGED for the initiator port associated with
+		 * every I_T nexus other than the I_T nexus on which the SET
+		 * TARGET PORT GROUPS command
+		 */
+		atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+
+		spin_lock_bh(&port->sep_alua_lock);
+		list_for_each_entry(se_deve, &port->sep_alua_list,
+					alua_port_list) {
+			lacl = se_deve->se_lun_acl;
+			/*
+			 * se_deve->se_lun_acl pointer may be NULL for a
+			 * entry created without explict Node+MappedLUN ACLs
+			 */
+			if (!(lacl))
+				continue;
+
+			if (explict &&
+			   (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
+			   (l_port != NULL) && (l_port == port))
+				continue;
+
+			core_scsi3_ua_allocate(lacl->se_lun_nacl,
+				se_deve->mapped_lun, 0x2A,
+				ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
+		}
+		spin_unlock_bh(&port->sep_alua_lock);
+
+		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+		atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+	/*
+	 * Update the ALUA metadata buf that has been allocated in
+	 * core_alua_do_port_transition(), this metadata will be written
+	 * to struct file.
+	 *
+	 * Note that there is the case where we do not want to update the
+	 * metadata when the saved metadata is being parsed in userspace
+	 * when setting the existing port access state and access status.
+	 *
+	 * Also note that the failure to write out the ALUA metadata to
+	 * struct file does NOT affect the actual ALUA transition.
+	 */
+	if (tg_pt_gp->tg_pt_gp_write_metadata) {
+		mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
+		core_alua_update_tpg_primary_metadata(tg_pt_gp,
+					new_state, md_buf);
+		mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
+	}
+	/*
+	 * Set the current primary ALUA access state to the requested new state
+	 */
+	atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
+
+	printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu"
+		" from primary access state %s to %s\n", (explict) ? "explict" :
+		"implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
+		tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
+		core_alua_dump_state(new_state));
+
+	return 0;
+}
+
+int core_alua_do_port_transition(
+	struct t10_alua_tg_pt_gp *l_tg_pt_gp,
+	struct se_device *l_dev,
+	struct se_port *l_port,
+	struct se_node_acl *l_nacl,
+	int new_state,
+	int explict)
+{
+	struct se_device *dev;
+	struct se_port *port;
+	struct se_subsystem_dev *su_dev;
+	struct se_node_acl *nacl;
+	struct t10_alua_lu_gp *lu_gp;
+	struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	unsigned char *md_buf;
+	int primary;
+
+	if (core_alua_check_transition(new_state, &primary) != 0)
+		return -EINVAL;
+
+	md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
+	if (!(md_buf)) {
+		printk("Unable to allocate buf for ALUA metadata\n");
+		return -ENOMEM;
+	}
+
+	local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
+	spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
+	lu_gp = local_lu_gp_mem->lu_gp;
+	atomic_inc(&lu_gp->lu_gp_ref_cnt);
+	smp_mb__after_atomic_inc();
+	spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
+	/*
+	 * For storage objects that are members of the 'default_lu_gp',
+	 * we only do transition on the passed *l_tp_pt_gp, and not
+	 * on all of the matching target port groups IDs in default_lu_gp.
+	 */
+	if (!(lu_gp->lu_gp_id)) {
+		/*
+		 * core_alua_do_transition_tg_pt() will always return
+		 * success.
+		 */
+		core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
+					md_buf, new_state, explict);
+		atomic_dec(&lu_gp->lu_gp_ref_cnt);
+		smp_mb__after_atomic_dec();
+		kfree(md_buf);
+		return 0;
+	}
+	/*
+	 * For all other LU groups aside from 'default_lu_gp', walk all of
+	 * the associated storage objects looking for a matching target port
+	 * group ID from the local target port group.
+	 */
+	spin_lock(&lu_gp->lu_gp_lock);
+	list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
+				lu_gp_mem_list) {
+
+		dev = lu_gp_mem->lu_gp_mem_dev;
+		su_dev = dev->se_sub_dev;
+		atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&lu_gp->lu_gp_lock);
+
+		spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+		list_for_each_entry(tg_pt_gp,
+				&T10_ALUA(su_dev)->tg_pt_gps_list,
+				tg_pt_gp_list) {
+
+			if (!(tg_pt_gp->tg_pt_gp_valid_id))
+				continue;
+			/*
+			 * If the target behavior port asymmetric access state
+			 * is changed for any target port group accessiable via
+			 * a logical unit within a LU group, the target port
+			 * behavior group asymmetric access states for the same
+			 * target port group accessible via other logical units
+			 * in that LU group will also change.
+			 */
+			if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
+				continue;
+
+			if (l_tg_pt_gp == tg_pt_gp) {
+				port = l_port;
+				nacl = l_nacl;
+			} else {
+				port = NULL;
+				nacl = NULL;
+			}
+			atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
+			smp_mb__after_atomic_inc();
+			spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+			/*
+			 * core_alua_do_transition_tg_pt() will always return
+			 * success.
+			 */
+			core_alua_do_transition_tg_pt(tg_pt_gp, port,
+					nacl, md_buf, new_state, explict);
+
+			spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+			atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
+			smp_mb__after_atomic_dec();
+		}
+		spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+
+		spin_lock(&lu_gp->lu_gp_lock);
+		atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&lu_gp->lu_gp_lock);
+
+	printk(KERN_INFO "Successfully processed LU Group: %s all ALUA TG PT"
+		" Group IDs: %hu %s transition to primary state: %s\n",
+		config_item_name(&lu_gp->lu_gp_group.cg_item),
+		l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
+		core_alua_dump_state(new_state));
+
+	atomic_dec(&lu_gp->lu_gp_ref_cnt);
+	smp_mb__after_atomic_dec();
+	kfree(md_buf);
+	return 0;
+}
+
+/*
+ * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
+ */
+static int core_alua_update_tpg_secondary_metadata(
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
+	struct se_port *port,
+	unsigned char *md_buf,
+	u32 md_buf_len)
+{
+	struct se_portal_group *se_tpg = port->sep_tpg;
+	char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
+	int len;
+
+	memset(path, 0, ALUA_METADATA_PATH_LEN);
+	memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
+
+	len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
+			TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg));
+
+	if (TPG_TFO(se_tpg)->tpg_get_tag != NULL)
+		snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
+				TPG_TFO(se_tpg)->tpg_get_tag(se_tpg));
+
+	len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
+			"alua_tg_pt_status=0x%02x\n",
+			atomic_read(&port->sep_tg_pt_secondary_offline),
+			port->sep_tg_pt_secondary_stat);
+
+	snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
+			TPG_TFO(se_tpg)->get_fabric_name(), wwn,
+			port->sep_lun->unpacked_lun);
+
+	return core_alua_write_tpg_metadata(path, md_buf, len);
+}
+
+static int core_alua_set_tg_pt_secondary_state(
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
+	struct se_port *port,
+	int explict,
+	int offline)
+{
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	unsigned char *md_buf;
+	u32 md_buf_len;
+	int trans_delay_msecs;
+
+	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+	if (!(tg_pt_gp)) {
+		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+		printk(KERN_ERR "Unable to complete secondary state"
+				" transition\n");
+		return -1;
+	}
+	trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
+	/*
+	 * Set the secondary ALUA target port access state to OFFLINE
+	 * or release the previously secondary state for struct se_port
+	 */
+	if (offline)
+		atomic_set(&port->sep_tg_pt_secondary_offline, 1);
+	else
+		atomic_set(&port->sep_tg_pt_secondary_offline, 0);
+
+	md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
+	port->sep_tg_pt_secondary_stat = (explict) ?
+			ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
+			ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
+
+	printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu"
+		" to secondary access state: %s\n", (explict) ? "explict" :
+		"implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
+		tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
+
+	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	/*
+	 * Do the optional transition delay after we set the secondary
+	 * ALUA access state.
+	 */
+	if (trans_delay_msecs != 0)
+		msleep_interruptible(trans_delay_msecs);
+	/*
+	 * See if we need to update the ALUA fabric port metadata for
+	 * secondary state and status
+	 */
+	if (port->sep_tg_pt_secondary_write_md) {
+		md_buf = kzalloc(md_buf_len, GFP_KERNEL);
+		if (!(md_buf)) {
+			printk(KERN_ERR "Unable to allocate md_buf for"
+				" secondary ALUA access metadata\n");
+			return -1;
+		}
+		mutex_lock(&port->sep_tg_pt_md_mutex);
+		core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
+				md_buf, md_buf_len);
+		mutex_unlock(&port->sep_tg_pt_md_mutex);
+
+		kfree(md_buf);
+	}
+
+	return 0;
+}
+
+struct t10_alua_lu_gp *
+core_alua_allocate_lu_gp(const char *name, int def_group)
+{
+	struct t10_alua_lu_gp *lu_gp;
+
+	lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
+	if (!(lu_gp)) {
+		printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp\n");
+		return ERR_PTR(-ENOMEM);;
+	}
+	INIT_LIST_HEAD(&lu_gp->lu_gp_list);
+	INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
+	spin_lock_init(&lu_gp->lu_gp_lock);
+	atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
+
+	if (def_group) {
+		lu_gp->lu_gp_id = se_global->alua_lu_gps_counter++;;
+		lu_gp->lu_gp_valid_id = 1;
+		se_global->alua_lu_gps_count++;
+	}
+
+	return lu_gp;
+}
+
+int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
+{
+	struct t10_alua_lu_gp *lu_gp_tmp;
+	u16 lu_gp_id_tmp;
+	/*
+	 * The lu_gp->lu_gp_id may only be set once..
+	 */
+	if (lu_gp->lu_gp_valid_id) {
+		printk(KERN_WARNING "ALUA LU Group already has a valid ID,"
+			" ignoring request\n");
+		return -1;
+	}
+
+	spin_lock(&se_global->lu_gps_lock);
+	if (se_global->alua_lu_gps_count == 0x0000ffff) {
+		printk(KERN_ERR "Maximum ALUA se_global->alua_lu_gps_count:"
+				" 0x0000ffff reached\n");
+		spin_unlock(&se_global->lu_gps_lock);
+		kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
+		return -1;
+	}
+again:
+	lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
+				se_global->alua_lu_gps_counter++;
+
+	list_for_each_entry(lu_gp_tmp, &se_global->g_lu_gps_list, lu_gp_list) {
+		if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
+			if (!(lu_gp_id))
+				goto again;
+
+			printk(KERN_WARNING "ALUA Logical Unit Group ID: %hu"
+				" already exists, ignoring request\n",
+				lu_gp_id);
+			spin_unlock(&se_global->lu_gps_lock);
+			return -1;
+		}
+	}
+
+	lu_gp->lu_gp_id = lu_gp_id_tmp;
+	lu_gp->lu_gp_valid_id = 1;
+	list_add_tail(&lu_gp->lu_gp_list, &se_global->g_lu_gps_list);
+	se_global->alua_lu_gps_count++;
+	spin_unlock(&se_global->lu_gps_lock);
+
+	return 0;
+}
+
+static struct t10_alua_lu_gp_member *
+core_alua_allocate_lu_gp_mem(struct se_device *dev)
+{
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+
+	lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
+	if (!(lu_gp_mem)) {
+		printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp_member\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
+	spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
+	atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
+
+	lu_gp_mem->lu_gp_mem_dev = dev;
+	dev->dev_alua_lu_gp_mem = lu_gp_mem;
+
+	return lu_gp_mem;
+}
+
+void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
+{
+	struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
+	/*
+	 * Once we have reached this point, config_item_put() has
+	 * already been called from target_core_alua_drop_lu_gp().
+	 *
+	 * Here, we remove the *lu_gp from the global list so that
+	 * no associations can be made while we are releasing
+	 * struct t10_alua_lu_gp.
+	 */
+	spin_lock(&se_global->lu_gps_lock);
+	atomic_set(&lu_gp->lu_gp_shutdown, 1);
+	list_del(&lu_gp->lu_gp_list);
+	se_global->alua_lu_gps_count--;
+	spin_unlock(&se_global->lu_gps_lock);
+	/*
+	 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
+	 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
+	 * released with core_alua_put_lu_gp_from_name()
+	 */
+	while (atomic_read(&lu_gp->lu_gp_ref_cnt))
+		cpu_relax();
+	/*
+	 * Release reference to struct t10_alua_lu_gp * from all associated
+	 * struct se_device.
+	 */
+	spin_lock(&lu_gp->lu_gp_lock);
+	list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
+				&lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
+		if (lu_gp_mem->lu_gp_assoc) {
+			list_del(&lu_gp_mem->lu_gp_mem_list);
+			lu_gp->lu_gp_members--;
+			lu_gp_mem->lu_gp_assoc = 0;
+		}
+		spin_unlock(&lu_gp->lu_gp_lock);
+		/*
+		 *
+		 * lu_gp_mem is assoicated with a single
+		 * struct se_device->dev_alua_lu_gp_mem, and is released when
+		 * struct se_device is released via core_alua_free_lu_gp_mem().
+		 *
+		 * If the passed lu_gp does NOT match the default_lu_gp, assume
+		 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
+		 */
+		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
+		if (lu_gp != se_global->default_lu_gp)
+			__core_alua_attach_lu_gp_mem(lu_gp_mem,
+					se_global->default_lu_gp);
+		else
+			lu_gp_mem->lu_gp = NULL;
+		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+		spin_lock(&lu_gp->lu_gp_lock);
+	}
+	spin_unlock(&lu_gp->lu_gp_lock);
+
+	kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
+}
+
+void core_alua_free_lu_gp_mem(struct se_device *dev)
+{
+	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
+	struct t10_alua *alua = T10_ALUA(su_dev);
+	struct t10_alua_lu_gp *lu_gp;
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+
+	if (alua->alua_type != SPC3_ALUA_EMULATED)
+		return;
+
+	lu_gp_mem = dev->dev_alua_lu_gp_mem;
+	if (!(lu_gp_mem))
+		return;
+
+	while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
+		cpu_relax();
+
+	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
+	lu_gp = lu_gp_mem->lu_gp;
+	if ((lu_gp)) {
+		spin_lock(&lu_gp->lu_gp_lock);
+		if (lu_gp_mem->lu_gp_assoc) {
+			list_del(&lu_gp_mem->lu_gp_mem_list);
+			lu_gp->lu_gp_members--;
+			lu_gp_mem->lu_gp_assoc = 0;
+		}
+		spin_unlock(&lu_gp->lu_gp_lock);
+		lu_gp_mem->lu_gp = NULL;
+	}
+	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+	kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
+}
+
+struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
+{
+	struct t10_alua_lu_gp *lu_gp;
+	struct config_item *ci;
+
+	spin_lock(&se_global->lu_gps_lock);
+	list_for_each_entry(lu_gp, &se_global->g_lu_gps_list, lu_gp_list) {
+		if (!(lu_gp->lu_gp_valid_id))
+			continue;
+		ci = &lu_gp->lu_gp_group.cg_item;
+		if (!(strcmp(config_item_name(ci), name))) {
+			atomic_inc(&lu_gp->lu_gp_ref_cnt);
+			spin_unlock(&se_global->lu_gps_lock);
+			return lu_gp;
+		}
+	}
+	spin_unlock(&se_global->lu_gps_lock);
+
+	return NULL;
+}
+
+void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
+{
+	spin_lock(&se_global->lu_gps_lock);
+	atomic_dec(&lu_gp->lu_gp_ref_cnt);
+	spin_unlock(&se_global->lu_gps_lock);
+}
+
+/*
+ * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
+ */
+void __core_alua_attach_lu_gp_mem(
+	struct t10_alua_lu_gp_member *lu_gp_mem,
+	struct t10_alua_lu_gp *lu_gp)
+{
+	spin_lock(&lu_gp->lu_gp_lock);
+	lu_gp_mem->lu_gp = lu_gp;
+	lu_gp_mem->lu_gp_assoc = 1;
+	list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
+	lu_gp->lu_gp_members++;
+	spin_unlock(&lu_gp->lu_gp_lock);
+}
+
+/*
+ * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
+ */
+void __core_alua_drop_lu_gp_mem(
+	struct t10_alua_lu_gp_member *lu_gp_mem,
+	struct t10_alua_lu_gp *lu_gp)
+{
+	spin_lock(&lu_gp->lu_gp_lock);
+	list_del(&lu_gp_mem->lu_gp_mem_list);
+	lu_gp_mem->lu_gp = NULL;
+	lu_gp_mem->lu_gp_assoc = 0;
+	lu_gp->lu_gp_members--;
+	spin_unlock(&lu_gp->lu_gp_lock);
+}
+
+struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
+	struct se_subsystem_dev *su_dev,
+	const char *name,
+	int def_group)
+{
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+
+	tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
+	if (!(tg_pt_gp)) {
+		printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp\n");
+		return NULL;
+	}
+	INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
+	INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
+	mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
+	spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
+	atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
+	tg_pt_gp->tg_pt_gp_su_dev = su_dev;
+	tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
+	atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
+		ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
+	/*
+	 * Enable both explict and implict ALUA support by default
+	 */
+	tg_pt_gp->tg_pt_gp_alua_access_type =
+			TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
+	/*
+	 * Set the default Active/NonOptimized Delay in milliseconds
+	 */
+	tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
+	tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
+
+	if (def_group) {
+		spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+		tg_pt_gp->tg_pt_gp_id =
+				T10_ALUA(su_dev)->alua_tg_pt_gps_counter++;
+		tg_pt_gp->tg_pt_gp_valid_id = 1;
+		T10_ALUA(su_dev)->alua_tg_pt_gps_count++;
+		list_add_tail(&tg_pt_gp->tg_pt_gp_list,
+			      &T10_ALUA(su_dev)->tg_pt_gps_list);
+		spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	}
+
+	return tg_pt_gp;
+}
+
+int core_alua_set_tg_pt_gp_id(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	u16 tg_pt_gp_id)
+{
+	struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
+	struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
+	u16 tg_pt_gp_id_tmp;
+	/*
+	 * The tg_pt_gp->tg_pt_gp_id may only be set once..
+	 */
+	if (tg_pt_gp->tg_pt_gp_valid_id) {
+		printk(KERN_WARNING "ALUA TG PT Group already has a valid ID,"
+			" ignoring request\n");
+		return -1;
+	}
+
+	spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	if (T10_ALUA(su_dev)->alua_tg_pt_gps_count == 0x0000ffff) {
+		printk(KERN_ERR "Maximum ALUA alua_tg_pt_gps_count:"
+			" 0x0000ffff reached\n");
+		spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+		kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
+		return -1;
+	}
+again:
+	tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
+			T10_ALUA(su_dev)->alua_tg_pt_gps_counter++;
+
+	list_for_each_entry(tg_pt_gp_tmp, &T10_ALUA(su_dev)->tg_pt_gps_list,
+			tg_pt_gp_list) {
+		if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
+			if (!(tg_pt_gp_id))
+				goto again;
+
+			printk(KERN_ERR "ALUA Target Port Group ID: %hu already"
+				" exists, ignoring request\n", tg_pt_gp_id);
+			spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+			return -1;
+		}
+	}
+
+	tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
+	tg_pt_gp->tg_pt_gp_valid_id = 1;
+	list_add_tail(&tg_pt_gp->tg_pt_gp_list,
+			&T10_ALUA(su_dev)->tg_pt_gps_list);
+	T10_ALUA(su_dev)->alua_tg_pt_gps_count++;
+	spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+
+	return 0;
+}
+
+struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
+	struct se_port *port)
+{
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+
+	tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
+				GFP_KERNEL);
+	if (!(tg_pt_gp_mem)) {
+		printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp_member\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
+	spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
+
+	tg_pt_gp_mem->tg_pt = port;
+	port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
+	atomic_set(&port->sep_tg_pt_gp_active, 1);
+
+	return tg_pt_gp_mem;
+}
+
+void core_alua_free_tg_pt_gp(
+	struct t10_alua_tg_pt_gp *tg_pt_gp)
+{
+	struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
+	/*
+	 * Once we have reached this point, config_item_put() has already
+	 * been called from target_core_alua_drop_tg_pt_gp().
+	 *
+	 * Here we remove *tg_pt_gp from the global list so that
+	 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
+	 * can be made while we are releasing struct t10_alua_tg_pt_gp.
+	 */
+	spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	list_del(&tg_pt_gp->tg_pt_gp_list);
+	T10_ALUA(su_dev)->alua_tg_pt_gps_counter--;
+	spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	/*
+	 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
+	 * core_alua_get_tg_pt_gp_by_name() in
+	 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
+	 * to be released with core_alua_put_tg_pt_gp_from_name().
+	 */
+	while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
+		cpu_relax();
+	/*
+	 * Release reference to struct t10_alua_tg_pt_gp from all associated
+	 * struct se_port.
+	 */
+	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+	list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
+			&tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
+		if (tg_pt_gp_mem->tg_pt_gp_assoc) {
+			list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
+			tg_pt_gp->tg_pt_gp_members--;
+			tg_pt_gp_mem->tg_pt_gp_assoc = 0;
+		}
+		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+		/*
+		 * tg_pt_gp_mem is assoicated with a single
+		 * se_port->sep_alua_tg_pt_gp_mem, and is released via
+		 * core_alua_free_tg_pt_gp_mem().
+		 *
+		 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
+		 * assume we want to re-assocate a given tg_pt_gp_mem with
+		 * default_tg_pt_gp.
+		 */
+		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+		if (tg_pt_gp != T10_ALUA(su_dev)->default_tg_pt_gp) {
+			__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
+					T10_ALUA(su_dev)->default_tg_pt_gp);
+		} else
+			tg_pt_gp_mem->tg_pt_gp = NULL;
+		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+
+		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+	}
+	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+
+	kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
+}
+
+void core_alua_free_tg_pt_gp_mem(struct se_port *port)
+{
+	struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
+	struct t10_alua *alua = T10_ALUA(su_dev);
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+
+	if (alua->alua_type != SPC3_ALUA_EMULATED)
+		return;
+
+	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+	if (!(tg_pt_gp_mem))
+		return;
+
+	while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
+		cpu_relax();
+
+	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+	if ((tg_pt_gp)) {
+		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+		if (tg_pt_gp_mem->tg_pt_gp_assoc) {
+			list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
+			tg_pt_gp->tg_pt_gp_members--;
+			tg_pt_gp_mem->tg_pt_gp_assoc = 0;
+		}
+		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+		tg_pt_gp_mem->tg_pt_gp = NULL;
+	}
+	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+
+	kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
+}
+
+static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
+	struct se_subsystem_dev *su_dev,
+	const char *name)
+{
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct config_item *ci;
+
+	spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->tg_pt_gps_list,
+			tg_pt_gp_list) {
+		if (!(tg_pt_gp->tg_pt_gp_valid_id))
+			continue;
+		ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
+		if (!(strcmp(config_item_name(ci), name))) {
+			atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
+			spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+			return tg_pt_gp;
+		}
+	}
+	spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+
+	return NULL;
+}
+
+static void core_alua_put_tg_pt_gp_from_name(
+	struct t10_alua_tg_pt_gp *tg_pt_gp)
+{
+	struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
+
+	spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+	atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
+	spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
+}
+
+/*
+ * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
+ */
+void __core_alua_attach_tg_pt_gp_mem(
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
+	struct t10_alua_tg_pt_gp *tg_pt_gp)
+{
+	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+	tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
+	tg_pt_gp_mem->tg_pt_gp_assoc = 1;
+	list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
+			&tg_pt_gp->tg_pt_gp_mem_list);
+	tg_pt_gp->tg_pt_gp_members++;
+	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+}
+
+/*
+ * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
+ */
+static void __core_alua_drop_tg_pt_gp_mem(
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
+	struct t10_alua_tg_pt_gp *tg_pt_gp)
+{
+	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+	list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
+	tg_pt_gp_mem->tg_pt_gp = NULL;
+	tg_pt_gp_mem->tg_pt_gp_assoc = 0;
+	tg_pt_gp->tg_pt_gp_members--;
+	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+}
+
+ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
+{
+	struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
+	struct config_item *tg_pt_ci;
+	struct t10_alua *alua = T10_ALUA(su_dev);
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	ssize_t len = 0;
+
+	if (alua->alua_type != SPC3_ALUA_EMULATED)
+		return len;
+
+	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+	if (!(tg_pt_gp_mem))
+		return len;
+
+	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+	if ((tg_pt_gp)) {
+		tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
+		len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
+			" %hu\nTG Port Primary Access State: %s\nTG Port "
+			"Primary Access Status: %s\nTG Port Secondary Access"
+			" State: %s\nTG Port Secondary Access Status: %s\n",
+			config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
+			core_alua_dump_state(atomic_read(
+					&tg_pt_gp->tg_pt_gp_alua_access_state)),
+			core_alua_dump_status(
+				tg_pt_gp->tg_pt_gp_alua_access_status),
+			(atomic_read(&port->sep_tg_pt_secondary_offline)) ?
+			"Offline" : "None",
+			core_alua_dump_status(port->sep_tg_pt_secondary_stat));
+	}
+	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+
+	return len;
+}
+
+ssize_t core_alua_store_tg_pt_gp_info(
+	struct se_port *port,
+	const char *page,
+	size_t count)
+{
+	struct se_portal_group *tpg;
+	struct se_lun *lun;
+	struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
+	struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	unsigned char buf[TG_PT_GROUP_NAME_BUF];
+	int move = 0;
+
+	tpg = port->sep_tpg;
+	lun = port->sep_lun;
+
+	if (T10_ALUA(su_dev)->alua_type != SPC3_ALUA_EMULATED) {
+		printk(KERN_WARNING "SPC3_ALUA_EMULATED not enabled for"
+			" %s/tpgt_%hu/%s\n", TPG_TFO(tpg)->tpg_get_wwn(tpg),
+			TPG_TFO(tpg)->tpg_get_tag(tpg),
+			config_item_name(&lun->lun_group.cg_item));
+		return -EINVAL;
+	}
+
+	if (count > TG_PT_GROUP_NAME_BUF) {
+		printk(KERN_ERR "ALUA Target Port Group alias too large!\n");
+		return -EINVAL;
+	}
+	memset(buf, 0, TG_PT_GROUP_NAME_BUF);
+	memcpy(buf, page, count);
+	/*
+	 * Any ALUA target port group alias besides "NULL" means we will be
+	 * making a new group association.
+	 */
+	if (strcmp(strstrip(buf), "NULL")) {
+		/*
+		 * core_alua_get_tg_pt_gp_by_name() will increment reference to
+		 * struct t10_alua_tg_pt_gp.  This reference is released with
+		 * core_alua_put_tg_pt_gp_from_name() below.
+		 */
+		tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev,
+					strstrip(buf));
+		if (!(tg_pt_gp_new))
+			return -ENODEV;
+	}
+	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+	if (!(tg_pt_gp_mem)) {
+		if (tg_pt_gp_new)
+			core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
+		printk(KERN_ERR "NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n");
+		return -EINVAL;
+	}
+
+	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+	if ((tg_pt_gp)) {
+		/*
+		 * Clearing an existing tg_pt_gp association, and replacing
+		 * with the default_tg_pt_gp.
+		 */
+		if (!(tg_pt_gp_new)) {
+			printk(KERN_INFO "Target_Core_ConfigFS: Moving"
+				" %s/tpgt_%hu/%s from ALUA Target Port Group:"
+				" alua/%s, ID: %hu back to"
+				" default_tg_pt_gp\n",
+				TPG_TFO(tpg)->tpg_get_wwn(tpg),
+				TPG_TFO(tpg)->tpg_get_tag(tpg),
+				config_item_name(&lun->lun_group.cg_item),
+				config_item_name(
+					&tg_pt_gp->tg_pt_gp_group.cg_item),
+				tg_pt_gp->tg_pt_gp_id);
+
+			__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
+			__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
+					T10_ALUA(su_dev)->default_tg_pt_gp);
+			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+
+			return count;
+		}
+		/*
+		 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
+		 */
+		__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
+		move = 1;
+	}
+	/*
+	 * Associate tg_pt_gp_mem with tg_pt_gp_new.
+	 */
+	__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
+	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	printk(KERN_INFO "Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
+		" Target Port Group: alua/%s, ID: %hu\n", (move) ?
+		"Moving" : "Adding", TPG_TFO(tpg)->tpg_get_wwn(tpg),
+		TPG_TFO(tpg)->tpg_get_tag(tpg),
+		config_item_name(&lun->lun_group.cg_item),
+		config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
+		tg_pt_gp_new->tg_pt_gp_id);
+
+	core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
+	return count;
+}
+
+ssize_t core_alua_show_access_type(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
+	    (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
+		return sprintf(page, "Implict and Explict\n");
+	else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
+		return sprintf(page, "Implict\n");
+	else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
+		return sprintf(page, "Explict\n");
+	else
+		return sprintf(page, "None\n");
+}
+
+ssize_t core_alua_store_access_type(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract alua_access_type\n");
+		return -EINVAL;
+	}
+	if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
+		printk(KERN_ERR "Illegal value for alua_access_type:"
+				" %lu\n", tmp);
+		return -EINVAL;
+	}
+	if (tmp == 3)
+		tg_pt_gp->tg_pt_gp_alua_access_type =
+			TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
+	else if (tmp == 2)
+		tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
+	else if (tmp == 1)
+		tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
+	else
+		tg_pt_gp->tg_pt_gp_alua_access_type = 0;
+
+	return count;
+}
+
+ssize_t core_alua_show_nonop_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
+}
+
+ssize_t core_alua_store_nonop_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract nonop_delay_msecs\n");
+		return -EINVAL;
+	}
+	if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
+		printk(KERN_ERR "Passed nonop_delay_msecs: %lu, exceeds"
+			" ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
+			ALUA_MAX_NONOP_DELAY_MSECS);
+		return -EINVAL;
+	}
+	tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
+
+	return count;
+}
+
+ssize_t core_alua_show_trans_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
+}
+
+ssize_t core_alua_store_trans_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract trans_delay_msecs\n");
+		return -EINVAL;
+	}
+	if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
+		printk(KERN_ERR "Passed trans_delay_msecs: %lu, exceeds"
+			" ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
+			ALUA_MAX_TRANS_DELAY_MSECS);
+		return -EINVAL;
+	}
+	tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
+
+	return count;
+}
+
+ssize_t core_alua_show_preferred_bit(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
+}
+
+ssize_t core_alua_store_preferred_bit(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract preferred ALUA value\n");
+		return -EINVAL;
+	}
+	if ((tmp != 0) && (tmp != 1)) {
+		printk(KERN_ERR "Illegal value for preferred ALUA: %lu\n", tmp);
+		return -EINVAL;
+	}
+	tg_pt_gp->tg_pt_gp_pref = (int)tmp;
+
+	return count;
+}
+
+ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
+{
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return sprintf(page, "%d\n",
+		atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
+}
+
+ssize_t core_alua_store_offline_bit(
+	struct se_lun *lun,
+	const char *page,
+	size_t count)
+{
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	unsigned long tmp;
+	int ret;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract alua_tg_pt_offline value\n");
+		return -EINVAL;
+	}
+	if ((tmp != 0) && (tmp != 1)) {
+		printk(KERN_ERR "Illegal value for alua_tg_pt_offline: %lu\n",
+				tmp);
+		return -EINVAL;
+	}
+	tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
+	if (!(tg_pt_gp_mem)) {
+		printk(KERN_ERR "Unable to locate *tg_pt_gp_mem\n");
+		return -EINVAL;
+	}
+
+	ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
+			lun->lun_sep, 0, (int)tmp);
+	if (ret < 0)
+		return -EINVAL;
+
+	return count;
+}
+
+ssize_t core_alua_show_secondary_status(
+	struct se_lun *lun,
+	char *page)
+{
+	return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
+}
+
+ssize_t core_alua_store_secondary_status(
+	struct se_lun *lun,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract alua_tg_pt_status\n");
+		return -EINVAL;
+	}
+	if ((tmp != ALUA_STATUS_NONE) &&
+	    (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
+	    (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
+		printk(KERN_ERR "Illegal value for alua_tg_pt_status: %lu\n",
+				tmp);
+		return -EINVAL;
+	}
+	lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
+
+	return count;
+}
+
+ssize_t core_alua_show_secondary_write_metadata(
+	struct se_lun *lun,
+	char *page)
+{
+	return sprintf(page, "%d\n",
+			lun->lun_sep->sep_tg_pt_secondary_write_md);
+}
+
+ssize_t core_alua_store_secondary_write_metadata(
+	struct se_lun *lun,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract alua_tg_pt_write_md\n");
+		return -EINVAL;
+	}
+	if ((tmp != 0) && (tmp != 1)) {
+		printk(KERN_ERR "Illegal value for alua_tg_pt_write_md:"
+				" %lu\n", tmp);
+		return -EINVAL;
+	}
+	lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
+
+	return count;
+}
+
+int core_setup_alua(struct se_device *dev, int force_pt)
+{
+	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
+	struct t10_alua *alua = T10_ALUA(su_dev);
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+	/*
+	 * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic
+	 * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
+	 * cause a problem because libata and some SATA RAID HBAs appear
+	 * under Linux/SCSI, but emulate SCSI logic themselves.
+	 */
+	if (((TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
+	    !(DEV_ATTRIB(dev)->emulate_alua)) || force_pt) {
+		alua->alua_type = SPC_ALUA_PASSTHROUGH;
+		alua->alua_state_check = &core_alua_state_check_nop;
+		printk(KERN_INFO "%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
+			" emulation\n", TRANSPORT(dev)->name);
+		return 0;
+	}
+	/*
+	 * If SPC-3 or above is reported by real or emulated struct se_device,
+	 * use emulated ALUA.
+	 */
+	if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) {
+		printk(KERN_INFO "%s: Enabling ALUA Emulation for SPC-3"
+			" device\n", TRANSPORT(dev)->name);
+		/*
+		 * Assoicate this struct se_device with the default ALUA
+		 * LUN Group.
+		 */
+		lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
+		if (IS_ERR(lu_gp_mem) || !lu_gp_mem)
+			return -1;
+
+		alua->alua_type = SPC3_ALUA_EMULATED;
+		alua->alua_state_check = &core_alua_state_check;
+		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
+		__core_alua_attach_lu_gp_mem(lu_gp_mem,
+				se_global->default_lu_gp);
+		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+		printk(KERN_INFO "%s: Adding to default ALUA LU Group:"
+			" core/alua/lu_gps/default_lu_gp\n",
+			TRANSPORT(dev)->name);
+	} else {
+		alua->alua_type = SPC2_ALUA_DISABLED;
+		alua->alua_state_check = &core_alua_state_check_nop;
+		printk(KERN_INFO "%s: Disabling ALUA Emulation for SPC-2"
+			" device\n", TRANSPORT(dev)->name);
+	}
+
+	return 0;
+}
diff --git a/drivers/target/target_core_alua.h b/drivers/target/target_core_alua.h
new file mode 100644
index 0000000..c86f97a
--- /dev/null
+++ b/drivers/target/target_core_alua.h
@@ -0,0 +1,126 @@
+#ifndef TARGET_CORE_ALUA_H
+#define TARGET_CORE_ALUA_H
+
+/*
+ * INQUIRY response data, TPGS Field
+ *
+ * from spc4r17 section 6.4.2 Table 135
+ */
+#define TPGS_NO_ALUA				0x00
+#define TPGS_IMPLICT_ALUA			0x10
+#define TPGS_EXPLICT_ALUA			0x20
+
+/*
+ * ASYMMETRIC ACCESS STATE field
+ *
+ * from spc4r17 section 6.27 Table 245
+ */
+#define ALUA_ACCESS_STATE_ACTIVE_OPTMIZED	0x0
+#define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED	0x1
+#define ALUA_ACCESS_STATE_STANDBY		0x2
+#define ALUA_ACCESS_STATE_UNAVAILABLE		0x3
+#define ALUA_ACCESS_STATE_OFFLINE		0xe
+#define ALUA_ACCESS_STATE_TRANSITION		0xf
+
+/*
+ * REPORT_TARGET_PORT_GROUP STATUS CODE
+ *
+ * from spc4r17 section 6.27 Table 246
+ */
+#define ALUA_STATUS_NONE				0x00
+#define ALUA_STATUS_ALTERED_BY_EXPLICT_STPG		0x01
+#define ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA		0x02
+
+/*
+ * From spc4r17, Table D.1: ASC and ASCQ Assignement
+ */
+#define ASCQ_04H_ALUA_STATE_TRANSITION			0x0a
+#define ASCQ_04H_ALUA_TG_PT_STANDBY			0x0b
+#define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE			0x0c
+#define ASCQ_04H_ALUA_OFFLINE				0x12
+
+/*
+ * Used as the default for Active/NonOptimized delay (in milliseconds)
+ * This can also be changed via configfs on a per target port group basis..
+ */
+#define ALUA_DEFAULT_NONOP_DELAY_MSECS			100
+#define ALUA_MAX_NONOP_DELAY_MSECS			10000 /* 10 seconds */
+/*
+ * Used for implict and explict ALUA transitional delay, that is disabled
+ * by default, and is intended to be used for debugging client side ALUA code.
+ */
+#define ALUA_DEFAULT_TRANS_DELAY_MSECS			0
+#define ALUA_MAX_TRANS_DELAY_MSECS			30000 /* 30 seconds */
+/*
+ * Used by core_alua_update_tpg_primary_metadata() and
+ * core_alua_update_tpg_secondary_metadata()
+ */
+#define ALUA_METADATA_PATH_LEN				512
+/*
+ * Used by core_alua_update_tpg_secondary_metadata()
+ */
+#define ALUA_SECONDARY_METADATA_WWN_LEN			256
+
+extern struct kmem_cache *t10_alua_lu_gp_cache;
+extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
+extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
+extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
+
+extern int core_emulate_report_target_port_groups(struct se_cmd *);
+extern int core_emulate_set_target_port_groups(struct se_cmd *);
+extern int core_alua_check_nonop_delay(struct se_cmd *);
+extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
+				struct se_device *, struct se_port *,
+				struct se_node_acl *, int, int);
+extern char *core_alua_dump_status(int);
+extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
+extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
+extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
+extern void core_alua_free_lu_gp_mem(struct se_device *);
+extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
+extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
+extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
+					struct t10_alua_lu_gp *);
+extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
+					struct t10_alua_lu_gp *);
+extern void core_alua_drop_lu_gp_dev(struct se_device *);
+extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
+			struct se_subsystem_dev *, const char *, int);
+extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
+extern struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
+					struct se_port *);
+extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
+extern void core_alua_free_tg_pt_gp_mem(struct se_port *);
+extern void __core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member *,
+					struct t10_alua_tg_pt_gp *);
+extern ssize_t core_alua_show_tg_pt_gp_info(struct se_port *, char *);
+extern ssize_t core_alua_store_tg_pt_gp_info(struct se_port *, const char *,
+						size_t);
+extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
+extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
+					const char *, size_t);
+extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
+						char *);
+extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
+					const char *, size_t);
+extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
+					char *);
+extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
+					const char *, size_t);
+extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
+					char *);
+extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
+					const char *, size_t);
+extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
+extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
+					size_t);
+extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
+extern ssize_t core_alua_store_secondary_status(struct se_lun *,
+					const char *, size_t);
+extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
+					char *);
+extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
+					const char *, size_t);
+extern int core_setup_alua(struct se_device *, int);
+
+#endif /* TARGET_CORE_ALUA_H */
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
new file mode 100644
index 0000000..366080b
--- /dev/null
+++ b/drivers/target/target_core_cdb.c
@@ -0,0 +1,1131 @@
+/*
+ * CDB emulation for non-READ/WRITE commands.
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <asm/unaligned.h>
+#include <scsi/scsi.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include "target_core_ua.h"
+
+static void
+target_fill_alua_data(struct se_port *port, unsigned char *buf)
+{
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+
+	/*
+	 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
+	 */
+	buf[5]	= 0x80;
+
+	/*
+	 * Set TPGS field for explict and/or implict ALUA access type
+	 * and opteration.
+	 *
+	 * See spc4r17 section 6.4.2 Table 135
+	 */
+	if (!port)
+		return;
+	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+	if (!tg_pt_gp_mem)
+		return;
+
+	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+	if (tg_pt_gp)
+		buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
+	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+}
+
+static int
+target_emulate_inquiry_std(struct se_cmd *cmd)
+{
+	struct se_lun *lun = SE_LUN(cmd);
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned char *buf = cmd->t_task->t_task_buf;
+
+	/*
+	 * Make sure we at least have 6 bytes of INQUIRY response
+	 * payload going back for EVPD=0
+	 */
+	if (cmd->data_length < 6) {
+		printk(KERN_ERR "SCSI Inquiry payload length: %u"
+			" too small for EVPD=0\n", cmd->data_length);
+		return -1;
+	}
+
+	buf[0] = dev->transport->get_device_type(dev);
+	if (buf[0] == TYPE_TAPE)
+		buf[1] = 0x80;
+	buf[2] = dev->transport->get_device_rev(dev);
+
+	/*
+	 * Enable SCCS and TPGS fields for Emulated ALUA
+	 */
+	if (T10_ALUA(dev->se_sub_dev)->alua_type == SPC3_ALUA_EMULATED)
+		target_fill_alua_data(lun->lun_sep, buf);
+
+	if (cmd->data_length < 8) {
+		buf[4] = 1; /* Set additional length to 1 */
+		return 0;
+	}
+
+	buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
+
+	/*
+	 * Do not include vendor, product, reversion info in INQUIRY
+	 * response payload for cdbs with a small allocation length.
+	 */
+	if (cmd->data_length < 36) {
+		buf[4] = 3; /* Set additional length to 3 */
+		return 0;
+	}
+
+	snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
+	snprintf((unsigned char *)&buf[16], 16, "%s",
+		 &DEV_T10_WWN(dev)->model[0]);
+	snprintf((unsigned char *)&buf[32], 4, "%s",
+		 &DEV_T10_WWN(dev)->revision[0]);
+	buf[4] = 31; /* Set additional length to 31 */
+	return 0;
+}
+
+/* supported vital product data pages */
+static int
+target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
+{
+	buf[1] = 0x00;
+	if (cmd->data_length < 8)
+		return 0;
+
+	buf[4] = 0x0;
+	/*
+	 * Only report the INQUIRY EVPD=1 pages after a valid NAA
+	 * Registered Extended LUN WWN has been set via ConfigFS
+	 * during device creation/restart.
+	 */
+	if (SE_DEV(cmd)->se_sub_dev->su_dev_flags &
+			SDF_EMULATED_VPD_UNIT_SERIAL) {
+		buf[3] = 3;
+		buf[5] = 0x80;
+		buf[6] = 0x83;
+		buf[7] = 0x86;
+	}
+
+	return 0;
+}
+
+/* unit serial number */
+static int
+target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	u16 len = 0;
+
+	buf[1] = 0x80;
+	if (dev->se_sub_dev->su_dev_flags &
+			SDF_EMULATED_VPD_UNIT_SERIAL) {
+		u32 unit_serial_len;
+
+		unit_serial_len =
+			strlen(&DEV_T10_WWN(dev)->unit_serial[0]);
+		unit_serial_len++; /* For NULL Terminator */
+
+		if (((len + 4) + unit_serial_len) > cmd->data_length) {
+			len += unit_serial_len;
+			buf[2] = ((len >> 8) & 0xff);
+			buf[3] = (len & 0xff);
+			return 0;
+		}
+		len += sprintf((unsigned char *)&buf[4], "%s",
+			&DEV_T10_WWN(dev)->unit_serial[0]);
+		len++; /* Extra Byte for NULL Terminator */
+		buf[3] = len;
+	}
+	return 0;
+}
+
+/*
+ * Device identification VPD, for a complete list of
+ * DESIGNATOR TYPEs see spc4r17 Table 459.
+ */
+static int
+target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_lun *lun = SE_LUN(cmd);
+	struct se_port *port = NULL;
+	struct se_portal_group *tpg = NULL;
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	unsigned char binary, binary_new;
+	unsigned char *prod = &DEV_T10_WWN(dev)->model[0];
+	u32 prod_len;
+	u32 unit_serial_len, off = 0;
+	int i;
+	u16 len = 0, id_len;
+
+	buf[1] = 0x83;
+	off = 4;
+
+	/*
+	 * NAA IEEE Registered Extended Assigned designator format, see
+	 * spc4r17 section 7.7.3.6.5
+	 *
+	 * We depend upon a target_core_mod/ConfigFS provided
+	 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
+	 * value in order to return the NAA id.
+	 */
+	if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
+		goto check_t10_vend_desc;
+
+	if (off + 20 > cmd->data_length)
+		goto check_t10_vend_desc;
+
+	/* CODE SET == Binary */
+	buf[off++] = 0x1;
+
+	/* Set ASSOICATION == addressed logical unit: 0)b */
+	buf[off] = 0x00;
+
+	/* Identifier/Designator type == NAA identifier */
+	buf[off++] = 0x3;
+	off++;
+
+	/* Identifier/Designator length */
+	buf[off++] = 0x10;
+
+	/*
+	 * Start NAA IEEE Registered Extended Identifier/Designator
+	 */
+	buf[off++] = (0x6 << 4);
+
+	/*
+	 * Use OpenFabrics IEEE Company ID: 00 14 05
+	 */
+	buf[off++] = 0x01;
+	buf[off++] = 0x40;
+	buf[off] = (0x5 << 4);
+
+	/*
+	 * Return ConfigFS Unit Serial Number information for
+	 * VENDOR_SPECIFIC_IDENTIFIER and
+	 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
+	 */
+	binary = transport_asciihex_to_binaryhex(
+				&DEV_T10_WWN(dev)->unit_serial[0]);
+	buf[off++] |= (binary & 0xf0) >> 4;
+	for (i = 0; i < 24; i += 2) {
+		binary_new = transport_asciihex_to_binaryhex(
+			&DEV_T10_WWN(dev)->unit_serial[i+2]);
+		buf[off] = (binary & 0x0f) << 4;
+		buf[off++] |= (binary_new & 0xf0) >> 4;
+		binary = binary_new;
+	}
+	len = 20;
+	off = (len + 4);
+
+check_t10_vend_desc:
+	/*
+	 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
+	 */
+	id_len = 8; /* For Vendor field */
+	prod_len = 4; /* For VPD Header */
+	prod_len += 8; /* For Vendor field */
+	prod_len += strlen(prod);
+	prod_len++; /* For : */
+
+	if (dev->se_sub_dev->su_dev_flags &
+			SDF_EMULATED_VPD_UNIT_SERIAL) {
+		unit_serial_len =
+			strlen(&DEV_T10_WWN(dev)->unit_serial[0]);
+		unit_serial_len++; /* For NULL Terminator */
+
+		if ((len + (id_len + 4) +
+		    (prod_len + unit_serial_len)) >
+				cmd->data_length) {
+			len += (prod_len + unit_serial_len);
+			goto check_port;
+		}
+		id_len += sprintf((unsigned char *)&buf[off+12],
+				"%s:%s", prod,
+				&DEV_T10_WWN(dev)->unit_serial[0]);
+	}
+	buf[off] = 0x2; /* ASCII */
+	buf[off+1] = 0x1; /* T10 Vendor ID */
+	buf[off+2] = 0x0;
+	memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
+	/* Extra Byte for NULL Terminator */
+	id_len++;
+	/* Identifier Length */
+	buf[off+3] = id_len;
+	/* Header size for Designation descriptor */
+	len += (id_len + 4);
+	off += (id_len + 4);
+	/*
+	 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
+	 */
+check_port:
+	port = lun->lun_sep;
+	if (port) {
+		struct t10_alua_lu_gp *lu_gp;
+		u32 padding, scsi_name_len;
+		u16 lu_gp_id = 0;
+		u16 tg_pt_gp_id = 0;
+		u16 tpgt;
+
+		tpg = port->sep_tpg;
+		/*
+		 * Relative target port identifer, see spc4r17
+		 * section 7.7.3.7
+		 *
+		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
+		 * section 7.5.1 Table 362
+		 */
+		if (((len + 4) + 8) > cmd->data_length) {
+			len += 8;
+			goto check_tpgi;
+		}
+		buf[off] =
+			(TPG_TFO(tpg)->get_fabric_proto_ident(tpg) << 4);
+		buf[off++] |= 0x1; /* CODE SET == Binary */
+		buf[off] = 0x80; /* Set PIV=1 */
+		/* Set ASSOICATION == target port: 01b */
+		buf[off] |= 0x10;
+		/* DESIGNATOR TYPE == Relative target port identifer */
+		buf[off++] |= 0x4;
+		off++; /* Skip over Reserved */
+		buf[off++] = 4; /* DESIGNATOR LENGTH */
+		/* Skip over Obsolete field in RTPI payload
+		 * in Table 472 */
+		off += 2;
+		buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
+		buf[off++] = (port->sep_rtpi & 0xff);
+		len += 8; /* Header size + Designation descriptor */
+		/*
+		 * Target port group identifier, see spc4r17
+		 * section 7.7.3.8
+		 *
+		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
+		 * section 7.5.1 Table 362
+		 */
+check_tpgi:
+		if (T10_ALUA(dev->se_sub_dev)->alua_type !=
+				SPC3_ALUA_EMULATED)
+			goto check_scsi_name;
+
+		if (((len + 4) + 8) > cmd->data_length) {
+			len += 8;
+			goto check_lu_gp;
+		}
+		tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+		if (!tg_pt_gp_mem)
+			goto check_lu_gp;
+
+		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+		tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
+		if (!(tg_pt_gp)) {
+			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+			goto check_lu_gp;
+		}
+		tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
+		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+
+		buf[off] =
+			(TPG_TFO(tpg)->get_fabric_proto_ident(tpg) << 4);
+		buf[off++] |= 0x1; /* CODE SET == Binary */
+		buf[off] = 0x80; /* Set PIV=1 */
+		/* Set ASSOICATION == target port: 01b */
+		buf[off] |= 0x10;
+		/* DESIGNATOR TYPE == Target port group identifier */
+		buf[off++] |= 0x5;
+		off++; /* Skip over Reserved */
+		buf[off++] = 4; /* DESIGNATOR LENGTH */
+		off += 2; /* Skip over Reserved Field */
+		buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
+		buf[off++] = (tg_pt_gp_id & 0xff);
+		len += 8; /* Header size + Designation descriptor */
+		/*
+		 * Logical Unit Group identifier, see spc4r17
+		 * section 7.7.3.8
+		 */
+check_lu_gp:
+		if (((len + 4) + 8) > cmd->data_length) {
+			len += 8;
+			goto check_scsi_name;
+		}
+		lu_gp_mem = dev->dev_alua_lu_gp_mem;
+		if (!(lu_gp_mem))
+			goto check_scsi_name;
+
+		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
+		lu_gp = lu_gp_mem->lu_gp;
+		if (!(lu_gp)) {
+			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+			goto check_scsi_name;
+		}
+		lu_gp_id = lu_gp->lu_gp_id;
+		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+		buf[off++] |= 0x1; /* CODE SET == Binary */
+		/* DESIGNATOR TYPE == Logical Unit Group identifier */
+		buf[off++] |= 0x6;
+		off++; /* Skip over Reserved */
+		buf[off++] = 4; /* DESIGNATOR LENGTH */
+		off += 2; /* Skip over Reserved Field */
+		buf[off++] = ((lu_gp_id >> 8) & 0xff);
+		buf[off++] = (lu_gp_id & 0xff);
+		len += 8; /* Header size + Designation descriptor */
+		/*
+		 * SCSI name string designator, see spc4r17
+		 * section 7.7.3.11
+		 *
+		 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
+		 * section 7.5.1 Table 362
+		 */
+check_scsi_name:
+		scsi_name_len = strlen(TPG_TFO(tpg)->tpg_get_wwn(tpg));
+		/* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
+		scsi_name_len += 10;
+		/* Check for 4-byte padding */
+		padding = ((-scsi_name_len) & 3);
+		if (padding != 0)
+			scsi_name_len += padding;
+		/* Header size + Designation descriptor */
+		scsi_name_len += 4;
+
+		if (((len + 4) + scsi_name_len) > cmd->data_length) {
+			len += scsi_name_len;
+			goto set_len;
+		}
+		buf[off] =
+			(TPG_TFO(tpg)->get_fabric_proto_ident(tpg) << 4);
+		buf[off++] |= 0x3; /* CODE SET == UTF-8 */
+		buf[off] = 0x80; /* Set PIV=1 */
+		/* Set ASSOICATION == target port: 01b */
+		buf[off] |= 0x10;
+		/* DESIGNATOR TYPE == SCSI name string */
+		buf[off++] |= 0x8;
+		off += 2; /* Skip over Reserved and length */
+		/*
+		 * SCSI name string identifer containing, $FABRIC_MOD
+		 * dependent information.  For LIO-Target and iSCSI
+		 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
+		 * UTF-8 encoding.
+		 */
+		tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg);
+		scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
+					TPG_TFO(tpg)->tpg_get_wwn(tpg), tpgt);
+		scsi_name_len += 1 /* Include  NULL terminator */;
+		/*
+		 * The null-terminated, null-padded (see 4.4.2) SCSI
+		 * NAME STRING field contains a UTF-8 format string.
+		 * The number of bytes in the SCSI NAME STRING field
+		 * (i.e., the value in the DESIGNATOR LENGTH field)
+		 * shall be no larger than 256 and shall be a multiple
+		 * of four.
+		 */
+		if (padding)
+			scsi_name_len += padding;
+
+		buf[off-1] = scsi_name_len;
+		off += scsi_name_len;
+		/* Header size + Designation descriptor */
+		len += (scsi_name_len + 4);
+	}
+set_len:
+	buf[2] = ((len >> 8) & 0xff);
+	buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
+	return 0;
+}
+
+/* Extended INQUIRY Data VPD Page */
+static int
+target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
+{
+	if (cmd->data_length < 60)
+		return 0;
+
+	buf[1] = 0x86;
+	buf[2] = 0x3c;
+	/* Set HEADSUP, ORDSUP, SIMPSUP */
+	buf[5] = 0x07;
+
+	/* If WriteCache emulation is enabled, set V_SUP */
+	if (DEV_ATTRIB(SE_DEV(cmd))->emulate_write_cache > 0)
+		buf[6] = 0x01;
+	return 0;
+}
+
+/* Block Limits VPD page */
+static int
+target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	int have_tp = 0;
+
+	/*
+	 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
+	 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
+	 * different page length for Thin Provisioning.
+	 */
+	if (DEV_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->emulate_tpws)
+		have_tp = 1;
+
+	if (cmd->data_length < (0x10 + 4)) {
+		printk(KERN_INFO "Received data_length: %u"
+			" too small for EVPD 0xb0\n",
+			cmd->data_length);
+		return -1;
+	}
+
+	if (have_tp && cmd->data_length < (0x3c + 4)) {
+		printk(KERN_INFO "Received data_length: %u"
+			" too small for TPE=1 EVPD 0xb0\n",
+			cmd->data_length);
+		have_tp = 0;
+	}
+
+	buf[0] = dev->transport->get_device_type(dev);
+	buf[1] = 0xb0;
+	buf[3] = have_tp ? 0x3c : 0x10;
+
+	/*
+	 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
+	 */
+	put_unaligned_be16(1, &buf[6]);
+
+	/*
+	 * Set MAXIMUM TRANSFER LENGTH
+	 */
+	put_unaligned_be32(DEV_ATTRIB(dev)->max_sectors, &buf[8]);
+
+	/*
+	 * Set OPTIMAL TRANSFER LENGTH
+	 */
+	put_unaligned_be32(DEV_ATTRIB(dev)->optimal_sectors, &buf[12]);
+
+	/*
+	 * Exit now if we don't support TP or the initiator sent a too
+	 * short buffer.
+	 */
+	if (!have_tp || cmd->data_length < (0x3c + 4))
+		return 0;
+
+	/*
+	 * Set MAXIMUM UNMAP LBA COUNT
+	 */
+	put_unaligned_be32(DEV_ATTRIB(dev)->max_unmap_lba_count, &buf[20]);
+
+	/*
+	 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
+	 */
+	put_unaligned_be32(DEV_ATTRIB(dev)->max_unmap_block_desc_count,
+			   &buf[24]);
+
+	/*
+	 * Set OPTIMAL UNMAP GRANULARITY
+	 */
+	put_unaligned_be32(DEV_ATTRIB(dev)->unmap_granularity, &buf[28]);
+
+	/*
+	 * UNMAP GRANULARITY ALIGNMENT
+	 */
+	put_unaligned_be32(DEV_ATTRIB(dev)->unmap_granularity_alignment,
+			   &buf[32]);
+	if (DEV_ATTRIB(dev)->unmap_granularity_alignment != 0)
+		buf[32] |= 0x80; /* Set the UGAVALID bit */
+
+	return 0;
+}
+
+/* Thin Provisioning VPD */
+static int
+target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
+{
+	struct se_device *dev = SE_DEV(cmd);
+
+	/*
+	 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
+	 *
+	 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
+	 * zero, then the page length shall be set to 0004h.  If the DP bit
+	 * is set to one, then the page length shall be set to the value
+	 * defined in table 162.
+	 */
+	buf[0] = dev->transport->get_device_type(dev);
+	buf[1] = 0xb2;
+
+	/*
+	 * Set Hardcoded length mentioned above for DP=0
+	 */
+	put_unaligned_be16(0x0004, &buf[2]);
+
+	/*
+	 * The THRESHOLD EXPONENT field indicates the threshold set size in
+	 * LBAs as a power of 2 (i.e., the threshold set size is equal to
+	 * 2(threshold exponent)).
+	 *
+	 * Note that this is currently set to 0x00 as mkp says it will be
+	 * changing again.  We can enable this once it has settled in T10
+	 * and is actually used by Linux/SCSI ML code.
+	 */
+	buf[4] = 0x00;
+
+	/*
+	 * A TPU bit set to one indicates that the device server supports
+	 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
+	 * that the device server does not support the UNMAP command.
+	 */
+	if (DEV_ATTRIB(dev)->emulate_tpu != 0)
+		buf[5] = 0x80;
+
+	/*
+	 * A TPWS bit set to one indicates that the device server supports
+	 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
+	 * A TPWS bit set to zero indicates that the device server does not
+	 * support the use of the WRITE SAME (16) command to unmap LBAs.
+	 */
+	if (DEV_ATTRIB(dev)->emulate_tpws != 0)
+		buf[5] |= 0x40;
+
+	return 0;
+}
+
+static int
+target_emulate_inquiry(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned char *buf = cmd->t_task->t_task_buf;
+	unsigned char *cdb = cmd->t_task->t_task_cdb;
+
+	if (!(cdb[1] & 0x1))
+		return target_emulate_inquiry_std(cmd);
+
+	/*
+	 * Make sure we at least have 4 bytes of INQUIRY response
+	 * payload for 0x00 going back for EVPD=1.  Note that 0x80
+	 * and 0x83 will check for enough payload data length and
+	 * jump to set_len: label when there is not enough inquiry EVPD
+	 * payload length left for the next outgoing EVPD metadata
+	 */
+	if (cmd->data_length < 4) {
+		printk(KERN_ERR "SCSI Inquiry payload length: %u"
+			" too small for EVPD=1\n", cmd->data_length);
+		return -1;
+	}
+	buf[0] = dev->transport->get_device_type(dev);
+
+	switch (cdb[2]) {
+	case 0x00:
+		return target_emulate_evpd_00(cmd, buf);
+	case 0x80:
+		return target_emulate_evpd_80(cmd, buf);
+	case 0x83:
+		return target_emulate_evpd_83(cmd, buf);
+	case 0x86:
+		return target_emulate_evpd_86(cmd, buf);
+	case 0xb0:
+		return target_emulate_evpd_b0(cmd, buf);
+	case 0xb2:
+		return target_emulate_evpd_b2(cmd, buf);
+	default:
+		printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+target_emulate_readcapacity(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned char *buf = cmd->t_task->t_task_buf;
+	u32 blocks = dev->transport->get_blocks(dev);
+
+	buf[0] = (blocks >> 24) & 0xff;
+	buf[1] = (blocks >> 16) & 0xff;
+	buf[2] = (blocks >> 8) & 0xff;
+	buf[3] = blocks & 0xff;
+	buf[4] = (DEV_ATTRIB(dev)->block_size >> 24) & 0xff;
+	buf[5] = (DEV_ATTRIB(dev)->block_size >> 16) & 0xff;
+	buf[6] = (DEV_ATTRIB(dev)->block_size >> 8) & 0xff;
+	buf[7] = DEV_ATTRIB(dev)->block_size & 0xff;
+	/*
+	 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
+	*/
+	if (DEV_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->emulate_tpws)
+		put_unaligned_be32(0xFFFFFFFF, &buf[0]);
+
+	return 0;
+}
+
+static int
+target_emulate_readcapacity_16(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned char *buf = cmd->t_task->t_task_buf;
+	unsigned long long blocks = dev->transport->get_blocks(dev);
+
+	buf[0] = (blocks >> 56) & 0xff;
+	buf[1] = (blocks >> 48) & 0xff;
+	buf[2] = (blocks >> 40) & 0xff;
+	buf[3] = (blocks >> 32) & 0xff;
+	buf[4] = (blocks >> 24) & 0xff;
+	buf[5] = (blocks >> 16) & 0xff;
+	buf[6] = (blocks >> 8) & 0xff;
+	buf[7] = blocks & 0xff;
+	buf[8] = (DEV_ATTRIB(dev)->block_size >> 24) & 0xff;
+	buf[9] = (DEV_ATTRIB(dev)->block_size >> 16) & 0xff;
+	buf[10] = (DEV_ATTRIB(dev)->block_size >> 8) & 0xff;
+	buf[11] = DEV_ATTRIB(dev)->block_size & 0xff;
+	/*
+	 * Set Thin Provisioning Enable bit following sbc3r22 in section
+	 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
+	 */
+	if (DEV_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->emulate_tpws)
+		buf[14] = 0x80;
+
+	return 0;
+}
+
+static int
+target_modesense_rwrecovery(unsigned char *p)
+{
+	p[0] = 0x01;
+	p[1] = 0x0a;
+
+	return 12;
+}
+
+static int
+target_modesense_control(struct se_device *dev, unsigned char *p)
+{
+	p[0] = 0x0a;
+	p[1] = 0x0a;
+	p[2] = 2;
+	/*
+	 * From spc4r17, section 7.4.6 Control mode Page
+	 *
+	 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
+	 *
+	 * 00b: The logical unit shall clear any unit attention condition
+	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+	 * status and shall not establish a unit attention condition when a com-
+	 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
+	 * status.
+	 *
+	 * 10b: The logical unit shall not clear any unit attention condition
+	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+	 * status and shall not establish a unit attention condition when
+	 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
+	 * CONFLICT status.
+	 *
+	 * 11b a The logical unit shall not clear any unit attention condition
+	 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+	 * status and shall establish a unit attention condition for the
+	 * initiator port associated with the I_T nexus on which the BUSY,
+	 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
+	 * Depending on the status, the additional sense code shall be set to
+	 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
+	 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
+	 * command, a unit attention condition shall be established only once
+	 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
+	 * to the number of commands completed with one of those status codes.
+	 */
+	p[4] = (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl == 2) ? 0x30 :
+	       (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
+	/*
+	 * From spc4r17, section 7.4.6 Control mode Page
+	 *
+	 * Task Aborted Status (TAS) bit set to zero.
+	 *
+	 * A task aborted status (TAS) bit set to zero specifies that aborted
+	 * tasks shall be terminated by the device server without any response
+	 * to the application client. A TAS bit set to one specifies that tasks
+	 * aborted by the actions of an I_T nexus other than the I_T nexus on
+	 * which the command was received shall be completed with TASK ABORTED
+	 * status (see SAM-4).
+	 */
+	p[5] = (DEV_ATTRIB(dev)->emulate_tas) ? 0x40 : 0x00;
+	p[8] = 0xff;
+	p[9] = 0xff;
+	p[11] = 30;
+
+	return 12;
+}
+
+static int
+target_modesense_caching(struct se_device *dev, unsigned char *p)
+{
+	p[0] = 0x08;
+	p[1] = 0x12;
+	if (DEV_ATTRIB(dev)->emulate_write_cache > 0)
+		p[2] = 0x04; /* Write Cache Enable */
+	p[12] = 0x20; /* Disabled Read Ahead */
+
+	return 20;
+}
+
+static void
+target_modesense_write_protect(unsigned char *buf, int type)
+{
+	/*
+	 * I believe that the WP bit (bit 7) in the mode header is the same for
+	 * all device types..
+	 */
+	switch (type) {
+	case TYPE_DISK:
+	case TYPE_TAPE:
+	default:
+		buf[0] |= 0x80; /* WP bit */
+		break;
+	}
+}
+
+static void
+target_modesense_dpofua(unsigned char *buf, int type)
+{
+	switch (type) {
+	case TYPE_DISK:
+		buf[0] |= 0x10; /* DPOFUA bit */
+		break;
+	default:
+		break;
+	}
+}
+
+static int
+target_emulate_modesense(struct se_cmd *cmd, int ten)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	char *cdb = cmd->t_task->t_task_cdb;
+	unsigned char *rbuf = cmd->t_task->t_task_buf;
+	int type = dev->transport->get_device_type(dev);
+	int offset = (ten) ? 8 : 4;
+	int length = 0;
+	unsigned char buf[SE_MODE_PAGE_BUF];
+
+	memset(buf, 0, SE_MODE_PAGE_BUF);
+
+	switch (cdb[2] & 0x3f) {
+	case 0x01:
+		length = target_modesense_rwrecovery(&buf[offset]);
+		break;
+	case 0x08:
+		length = target_modesense_caching(dev, &buf[offset]);
+		break;
+	case 0x0a:
+		length = target_modesense_control(dev, &buf[offset]);
+		break;
+	case 0x3f:
+		length = target_modesense_rwrecovery(&buf[offset]);
+		length += target_modesense_caching(dev, &buf[offset+length]);
+		length += target_modesense_control(dev, &buf[offset+length]);
+		break;
+	default:
+		printk(KERN_ERR "Got Unknown Mode Page: 0x%02x\n",
+				cdb[2] & 0x3f);
+		return PYX_TRANSPORT_UNKNOWN_MODE_PAGE;
+	}
+	offset += length;
+
+	if (ten) {
+		offset -= 2;
+		buf[0] = (offset >> 8) & 0xff;
+		buf[1] = offset & 0xff;
+
+		if ((SE_LUN(cmd)->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
+		    (cmd->se_deve &&
+		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
+			target_modesense_write_protect(&buf[3], type);
+
+		if ((DEV_ATTRIB(dev)->emulate_write_cache > 0) &&
+		    (DEV_ATTRIB(dev)->emulate_fua_write > 0))
+			target_modesense_dpofua(&buf[3], type);
+
+		if ((offset + 2) > cmd->data_length)
+			offset = cmd->data_length;
+
+	} else {
+		offset -= 1;
+		buf[0] = offset & 0xff;
+
+		if ((SE_LUN(cmd)->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
+		    (cmd->se_deve &&
+		    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
+			target_modesense_write_protect(&buf[2], type);
+
+		if ((DEV_ATTRIB(dev)->emulate_write_cache > 0) &&
+		    (DEV_ATTRIB(dev)->emulate_fua_write > 0))
+			target_modesense_dpofua(&buf[2], type);
+
+		if ((offset + 1) > cmd->data_length)
+			offset = cmd->data_length;
+	}
+	memcpy(rbuf, buf, offset);
+
+	return 0;
+}
+
+static int
+target_emulate_request_sense(struct se_cmd *cmd)
+{
+	unsigned char *cdb = cmd->t_task->t_task_cdb;
+	unsigned char *buf = cmd->t_task->t_task_buf;
+	u8 ua_asc = 0, ua_ascq = 0;
+
+	if (cdb[1] & 0x01) {
+		printk(KERN_ERR "REQUEST_SENSE description emulation not"
+			" supported\n");
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+	if (!(core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))) {
+		/*
+		 * CURRENT ERROR, UNIT ATTENTION
+		 */
+		buf[0] = 0x70;
+		buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
+		/*
+		 * Make sure request data length is enough for additional
+		 * sense data.
+		 */
+		if (cmd->data_length <= 18) {
+			buf[7] = 0x00;
+			return 0;
+		}
+		/*
+		 * The Additional Sense Code (ASC) from the UNIT ATTENTION
+		 */
+		buf[SPC_ASC_KEY_OFFSET] = ua_asc;
+		buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
+		buf[7] = 0x0A;
+	} else {
+		/*
+		 * CURRENT ERROR, NO SENSE
+		 */
+		buf[0] = 0x70;
+		buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
+		/*
+		 * Make sure request data length is enough for additional
+		 * sense data.
+		 */
+		if (cmd->data_length <= 18) {
+			buf[7] = 0x00;
+			return 0;
+		}
+		/*
+		 * NO ADDITIONAL SENSE INFORMATION
+		 */
+		buf[SPC_ASC_KEY_OFFSET] = 0x00;
+		buf[7] = 0x0A;
+	}
+
+	return 0;
+}
+
+/*
+ * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
+ * Note this is not used for TCM/pSCSI passthrough
+ */
+static int
+target_emulate_unmap(struct se_task *task)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned char *buf = cmd->t_task->t_task_buf, *ptr = NULL;
+	unsigned char *cdb = &cmd->t_task->t_task_cdb[0];
+	sector_t lba;
+	unsigned int size = cmd->data_length, range;
+	int ret, offset;
+	unsigned short dl, bd_dl;
+
+	/* First UNMAP block descriptor starts at 8 byte offset */
+	offset = 8;
+	size -= 8;
+	dl = get_unaligned_be16(&cdb[0]);
+	bd_dl = get_unaligned_be16(&cdb[2]);
+	ptr = &buf[offset];
+	printk(KERN_INFO "UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
+		" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
+
+	while (size) {
+		lba = get_unaligned_be64(&ptr[0]);
+		range = get_unaligned_be32(&ptr[8]);
+		printk(KERN_INFO "UNMAP: Using lba: %llu and range: %u\n",
+				 (unsigned long long)lba, range);
+
+		ret = dev->transport->do_discard(dev, lba, range);
+		if (ret < 0) {
+			printk(KERN_ERR "blkdev_issue_discard() failed: %d\n",
+					ret);
+			return -1;
+		}
+
+		ptr += 16;
+		size -= 16;
+	}
+
+	task->task_scsi_status = GOOD;
+	transport_complete_task(task, 1);
+	return 0;
+}
+
+/*
+ * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
+ * Note this is not used for TCM/pSCSI passthrough
+ */
+static int
+target_emulate_write_same(struct se_task *task)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+	struct se_device *dev = SE_DEV(cmd);
+	sector_t lba = cmd->t_task->t_task_lba;
+	unsigned int range;
+	int ret;
+
+	range = (cmd->data_length / DEV_ATTRIB(dev)->block_size);
+
+	printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %u\n",
+			 (unsigned long long)lba, range);
+
+	ret = dev->transport->do_discard(dev, lba, range);
+	if (ret < 0) {
+		printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n");
+		return -1;
+	}
+
+	task->task_scsi_status = GOOD;
+	transport_complete_task(task, 1);
+	return 0;
+}
+
+int
+transport_emulate_control_cdb(struct se_task *task)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned short service_action;
+	int ret = 0;
+
+	switch (cmd->t_task->t_task_cdb[0]) {
+	case INQUIRY:
+		ret = target_emulate_inquiry(cmd);
+		break;
+	case READ_CAPACITY:
+		ret = target_emulate_readcapacity(cmd);
+		break;
+	case MODE_SENSE:
+		ret = target_emulate_modesense(cmd, 0);
+		break;
+	case MODE_SENSE_10:
+		ret = target_emulate_modesense(cmd, 1);
+		break;
+	case SERVICE_ACTION_IN:
+		switch (cmd->t_task->t_task_cdb[1] & 0x1f) {
+		case SAI_READ_CAPACITY_16:
+			ret = target_emulate_readcapacity_16(cmd);
+			break;
+		default:
+			printk(KERN_ERR "Unsupported SA: 0x%02x\n",
+				cmd->t_task->t_task_cdb[1] & 0x1f);
+			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+		}
+		break;
+	case REQUEST_SENSE:
+		ret = target_emulate_request_sense(cmd);
+		break;
+	case UNMAP:
+		if (!dev->transport->do_discard) {
+			printk(KERN_ERR "UNMAP emulation not supported for: %s\n",
+					dev->transport->name);
+			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+		}
+		ret = target_emulate_unmap(task);
+		break;
+	case WRITE_SAME_16:
+		if (!dev->transport->do_discard) {
+			printk(KERN_ERR "WRITE_SAME_16 emulation not supported"
+					" for: %s\n", dev->transport->name);
+			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+		}
+		ret = target_emulate_write_same(task);
+		break;
+	case VARIABLE_LENGTH_CMD:
+		service_action =
+			get_unaligned_be16(&cmd->t_task->t_task_cdb[8]);
+		switch (service_action) {
+		case WRITE_SAME_32:
+			if (!dev->transport->do_discard) {
+				printk(KERN_ERR "WRITE_SAME_32 SA emulation not"
+					" supported for: %s\n",
+					dev->transport->name);
+				return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+			}
+			ret = target_emulate_write_same(task);
+			break;
+		default:
+			printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"
+					" 0x%02x\n", service_action);
+			break;
+		}
+		break;
+	case SYNCHRONIZE_CACHE:
+	case 0x91: /* SYNCHRONIZE_CACHE_16: */
+		if (!dev->transport->do_sync_cache) {
+			printk(KERN_ERR
+				"SYNCHRONIZE_CACHE emulation not supported"
+				" for: %s\n", dev->transport->name);
+			return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+		}
+		dev->transport->do_sync_cache(task);
+		break;
+	case ALLOW_MEDIUM_REMOVAL:
+	case ERASE:
+	case REZERO_UNIT:
+	case SEEK_10:
+	case SPACE:
+	case START_STOP:
+	case TEST_UNIT_READY:
+	case VERIFY:
+	case WRITE_FILEMARKS:
+		break;
+	default:
+		printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n",
+			cmd->t_task->t_task_cdb[0], dev->transport->name);
+		return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+	}
+
+	if (ret < 0)
+		return ret;
+	task->task_scsi_status = GOOD;
+	transport_complete_task(task, 1);
+
+	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
new file mode 100644
index 0000000..2764510
--- /dev/null
+++ b/drivers/target/target_core_configfs.c
@@ -0,0 +1,3225 @@
+/*******************************************************************************
+ * Filename:  target_core_configfs.c
+ *
+ * This file contains ConfigFS logic for the Generic Target Engine project.
+ *
+ * Copyright (c) 2008-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ ****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <generated/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/syscalls.h>
+#include <linux/configfs.h>
+#include <linux/proc_fs.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_fabric_configfs.h>
+#include <target/target_core_configfs.h>
+#include <target/configfs_macros.h>
+
+#include "target_core_alua.h"
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+#include "target_core_rd.h"
+
+static struct list_head g_tf_list;
+static struct mutex g_tf_lock;
+
+struct target_core_configfs_attribute {
+	struct configfs_attribute attr;
+	ssize_t (*show)(void *, char *);
+	ssize_t (*store)(void *, const char *, size_t);
+};
+
+static inline struct se_hba *
+item_to_hba(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct se_hba, hba_group);
+}
+
+/*
+ * Attributes for /sys/kernel/config/target/
+ */
+static ssize_t target_core_attr_show(struct config_item *item,
+				      struct configfs_attribute *attr,
+				      char *page)
+{
+	return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
+		" on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_CONFIGFS_VERSION,
+		utsname()->sysname, utsname()->machine);
+}
+
+static struct configfs_item_operations target_core_fabric_item_ops = {
+	.show_attribute = target_core_attr_show,
+};
+
+static struct configfs_attribute target_core_item_attr_version = {
+	.ca_owner	= THIS_MODULE,
+	.ca_name	= "version",
+	.ca_mode	= S_IRUGO,
+};
+
+static struct target_fabric_configfs *target_core_get_fabric(
+	const char *name)
+{
+	struct target_fabric_configfs *tf;
+
+	if (!(name))
+		return NULL;
+
+	mutex_lock(&g_tf_lock);
+	list_for_each_entry(tf, &g_tf_list, tf_list) {
+		if (!(strcmp(tf->tf_name, name))) {
+			atomic_inc(&tf->tf_access_cnt);
+			mutex_unlock(&g_tf_lock);
+			return tf;
+		}
+	}
+	mutex_unlock(&g_tf_lock);
+
+	return NULL;
+}
+
+/*
+ * Called from struct target_core_group_ops->make_group()
+ */
+static struct config_group *target_core_register_fabric(
+	struct config_group *group,
+	const char *name)
+{
+	struct target_fabric_configfs *tf;
+	int ret;
+
+	printk(KERN_INFO "Target_Core_ConfigFS: REGISTER -> group: %p name:"
+			" %s\n", group, name);
+	/*
+	 * Ensure that TCM subsystem plugins are loaded at this point for
+	 * using the RAMDISK_DR virtual LUN 0 and all other struct se_port
+	 * LUN symlinks.
+	 */
+	if (transport_subsystem_check_init() < 0)
+		return ERR_PTR(-EINVAL);
+
+	/*
+	 * Below are some hardcoded request_module() calls to automatically
+	 * local fabric modules when the following is called:
+	 *
+	 * mkdir -p /sys/kernel/config/target/$MODULE_NAME
+	 *
+	 * Note that this does not limit which TCM fabric module can be
+	 * registered, but simply provids auto loading logic for modules with
+	 * mkdir(2) system calls with known TCM fabric modules.
+	 */
+	if (!(strncmp(name, "iscsi", 5))) {
+		/*
+		 * Automatically load the LIO Target fabric module when the
+		 * following is called:
+		 *
+		 * mkdir -p $CONFIGFS/target/iscsi
+		 */
+		ret = request_module("iscsi_target_mod");
+		if (ret < 0) {
+			printk(KERN_ERR "request_module() failed for"
+				" iscsi_target_mod.ko: %d\n", ret);
+			return ERR_PTR(-EINVAL);
+		}
+	} else if (!(strncmp(name, "loopback", 8))) {
+		/*
+		 * Automatically load the tcm_loop fabric module when the
+		 * following is called:
+		 *
+		 * mkdir -p $CONFIGFS/target/loopback
+		 */
+		ret = request_module("tcm_loop");
+		if (ret < 0) {
+			printk(KERN_ERR "request_module() failed for"
+				" tcm_loop.ko: %d\n", ret);
+			return ERR_PTR(-EINVAL);
+		}
+	}
+
+	tf = target_core_get_fabric(name);
+	if (!(tf)) {
+		printk(KERN_ERR "target_core_get_fabric() failed for %s\n",
+			name);
+		return ERR_PTR(-EINVAL);
+	}
+	printk(KERN_INFO "Target_Core_ConfigFS: REGISTER -> Located fabric:"
+			" %s\n", tf->tf_name);
+	/*
+	 * On a successful target_core_get_fabric() look, the returned
+	 * struct target_fabric_configfs *tf will contain a usage reference.
+	 */
+	printk(KERN_INFO "Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
+			&TF_CIT_TMPL(tf)->tfc_wwn_cit);
+
+	tf->tf_group.default_groups = tf->tf_default_groups;
+	tf->tf_group.default_groups[0] = &tf->tf_disc_group;
+	tf->tf_group.default_groups[1] = NULL;
+
+	config_group_init_type_name(&tf->tf_group, name,
+			&TF_CIT_TMPL(tf)->tfc_wwn_cit);
+	config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
+			&TF_CIT_TMPL(tf)->tfc_discovery_cit);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
+			" %s\n", tf->tf_group.cg_item.ci_name);
+	/*
+	 * Setup tf_ops.tf_subsys pointer for usage with configfs_depend_item()
+	 */
+	tf->tf_ops.tf_subsys = tf->tf_subsys;
+	tf->tf_fabric = &tf->tf_group.cg_item;
+	printk(KERN_INFO "Target_Core_ConfigFS: REGISTER -> Set tf->tf_fabric"
+			" for %s\n", name);
+
+	return &tf->tf_group;
+}
+
+/*
+ * Called from struct target_core_group_ops->drop_item()
+ */
+static void target_core_deregister_fabric(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct target_fabric_configfs *tf = container_of(
+		to_config_group(item), struct target_fabric_configfs, tf_group);
+	struct config_group *tf_group;
+	struct config_item *df_item;
+	int i;
+
+	printk(KERN_INFO "Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
+		" tf list\n", config_item_name(item));
+
+	printk(KERN_INFO "Target_Core_ConfigFS: DEREGISTER -> located fabric:"
+			" %s\n", tf->tf_name);
+	atomic_dec(&tf->tf_access_cnt);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: DEREGISTER -> Releasing"
+			" tf->tf_fabric for %s\n", tf->tf_name);
+	tf->tf_fabric = NULL;
+
+	printk(KERN_INFO "Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
+			" %s\n", config_item_name(item));
+
+	tf_group = &tf->tf_group;
+	for (i = 0; tf_group->default_groups[i]; i++) {
+		df_item = &tf_group->default_groups[i]->cg_item;
+		tf_group->default_groups[i] = NULL;
+		config_item_put(df_item);
+	}
+	config_item_put(item);
+}
+
+static struct configfs_group_operations target_core_fabric_group_ops = {
+	.make_group	= &target_core_register_fabric,
+	.drop_item	= &target_core_deregister_fabric,
+};
+
+/*
+ * All item attributes appearing in /sys/kernel/target/ appear here.
+ */
+static struct configfs_attribute *target_core_fabric_item_attrs[] = {
+	&target_core_item_attr_version,
+	NULL,
+};
+
+/*
+ * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
+ */
+static struct config_item_type target_core_fabrics_item = {
+	.ct_item_ops	= &target_core_fabric_item_ops,
+	.ct_group_ops	= &target_core_fabric_group_ops,
+	.ct_attrs	= target_core_fabric_item_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+static struct configfs_subsystem target_core_fabrics = {
+	.su_group = {
+		.cg_item = {
+			.ci_namebuf = "target",
+			.ci_type = &target_core_fabrics_item,
+		},
+	},
+};
+
+static struct configfs_subsystem *target_core_subsystem[] = {
+	&target_core_fabrics,
+	NULL,
+};
+
+/*##############################################################################
+// Start functions called by external Target Fabrics Modules
+//############################################################################*/
+
+/*
+ * First function called by fabric modules to:
+ *
+ * 1) Allocate a struct target_fabric_configfs and save the *fabric_cit pointer.
+ * 2) Add struct target_fabric_configfs to g_tf_list
+ * 3) Return struct target_fabric_configfs to fabric module to be passed
+ *    into target_fabric_configfs_register().
+ */
+struct target_fabric_configfs *target_fabric_configfs_init(
+	struct module *fabric_mod,
+	const char *name)
+{
+	struct target_fabric_configfs *tf;
+
+	if (!(fabric_mod)) {
+		printk(KERN_ERR "Missing struct module *fabric_mod pointer\n");
+		return NULL;
+	}
+	if (!(name)) {
+		printk(KERN_ERR "Unable to locate passed fabric name\n");
+		return NULL;
+	}
+	if (strlen(name) > TARGET_FABRIC_NAME_SIZE) {
+		printk(KERN_ERR "Passed name: %s exceeds TARGET_FABRIC"
+			"_NAME_SIZE\n", name);
+		return NULL;
+	}
+
+	tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
+	if (!(tf))
+		return ERR_PTR(-ENOMEM);
+
+	INIT_LIST_HEAD(&tf->tf_list);
+	atomic_set(&tf->tf_access_cnt, 0);
+	/*
+	 * Setup the default generic struct config_item_type's (cits) in
+	 * struct target_fabric_configfs->tf_cit_tmpl
+	 */
+	tf->tf_module = fabric_mod;
+	target_fabric_setup_cits(tf);
+
+	tf->tf_subsys = target_core_subsystem[0];
+	snprintf(tf->tf_name, TARGET_FABRIC_NAME_SIZE, "%s", name);
+
+	mutex_lock(&g_tf_lock);
+	list_add_tail(&tf->tf_list, &g_tf_list);
+	mutex_unlock(&g_tf_lock);
+
+	printk(KERN_INFO "<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>"
+			">>>>>>>>>>>>>>\n");
+	printk(KERN_INFO "Initialized struct target_fabric_configfs: %p for"
+			" %s\n", tf, tf->tf_name);
+	return tf;
+}
+EXPORT_SYMBOL(target_fabric_configfs_init);
+
+/*
+ * Called by fabric plugins after FAILED target_fabric_configfs_register() call.
+ */
+void target_fabric_configfs_free(
+	struct target_fabric_configfs *tf)
+{
+	mutex_lock(&g_tf_lock);
+	list_del(&tf->tf_list);
+	mutex_unlock(&g_tf_lock);
+
+	kfree(tf);
+}
+EXPORT_SYMBOL(target_fabric_configfs_free);
+
+/*
+ * Perform a sanity check of the passed tf->tf_ops before completing
+ * TCM fabric module registration.
+ */
+static int target_fabric_tf_ops_check(
+	struct target_fabric_configfs *tf)
+{
+	struct target_core_fabric_ops *tfo = &tf->tf_ops;
+
+	if (!(tfo->get_fabric_name)) {
+		printk(KERN_ERR "Missing tfo->get_fabric_name()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->get_fabric_proto_ident)) {
+		printk(KERN_ERR "Missing tfo->get_fabric_proto_ident()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_get_wwn)) {
+		printk(KERN_ERR "Missing tfo->tpg_get_wwn()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_get_tag)) {
+		printk(KERN_ERR "Missing tfo->tpg_get_tag()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_get_default_depth)) {
+		printk(KERN_ERR "Missing tfo->tpg_get_default_depth()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_get_pr_transport_id)) {
+		printk(KERN_ERR "Missing tfo->tpg_get_pr_transport_id()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_get_pr_transport_id_len)) {
+		printk(KERN_ERR "Missing tfo->tpg_get_pr_transport_id_len()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_check_demo_mode)) {
+		printk(KERN_ERR "Missing tfo->tpg_check_demo_mode()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_check_demo_mode_cache)) {
+		printk(KERN_ERR "Missing tfo->tpg_check_demo_mode_cache()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_check_demo_mode_write_protect)) {
+		printk(KERN_ERR "Missing tfo->tpg_check_demo_mode_write_protect()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_check_prod_mode_write_protect)) {
+		printk(KERN_ERR "Missing tfo->tpg_check_prod_mode_write_protect()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_alloc_fabric_acl)) {
+		printk(KERN_ERR "Missing tfo->tpg_alloc_fabric_acl()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_release_fabric_acl)) {
+		printk(KERN_ERR "Missing tfo->tpg_release_fabric_acl()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->tpg_get_inst_index)) {
+		printk(KERN_ERR "Missing tfo->tpg_get_inst_index()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->release_cmd_to_pool)) {
+		printk(KERN_ERR "Missing tfo->release_cmd_to_pool()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->release_cmd_direct)) {
+		printk(KERN_ERR "Missing tfo->release_cmd_direct()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->shutdown_session)) {
+		printk(KERN_ERR "Missing tfo->shutdown_session()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->close_session)) {
+		printk(KERN_ERR "Missing tfo->close_session()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->stop_session)) {
+		printk(KERN_ERR "Missing tfo->stop_session()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->fall_back_to_erl0)) {
+		printk(KERN_ERR "Missing tfo->fall_back_to_erl0()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->sess_logged_in)) {
+		printk(KERN_ERR "Missing tfo->sess_logged_in()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->sess_get_index)) {
+		printk(KERN_ERR "Missing tfo->sess_get_index()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->write_pending)) {
+		printk(KERN_ERR "Missing tfo->write_pending()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->write_pending_status)) {
+		printk(KERN_ERR "Missing tfo->write_pending_status()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->set_default_node_attributes)) {
+		printk(KERN_ERR "Missing tfo->set_default_node_attributes()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->get_task_tag)) {
+		printk(KERN_ERR "Missing tfo->get_task_tag()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->get_cmd_state)) {
+		printk(KERN_ERR "Missing tfo->get_cmd_state()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->new_cmd_failure)) {
+		printk(KERN_ERR "Missing tfo->new_cmd_failure()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->queue_data_in)) {
+		printk(KERN_ERR "Missing tfo->queue_data_in()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->queue_status)) {
+		printk(KERN_ERR "Missing tfo->queue_status()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->queue_tm_rsp)) {
+		printk(KERN_ERR "Missing tfo->queue_tm_rsp()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->set_fabric_sense_len)) {
+		printk(KERN_ERR "Missing tfo->set_fabric_sense_len()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->get_fabric_sense_len)) {
+		printk(KERN_ERR "Missing tfo->get_fabric_sense_len()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->is_state_remove)) {
+		printk(KERN_ERR "Missing tfo->is_state_remove()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->pack_lun)) {
+		printk(KERN_ERR "Missing tfo->pack_lun()\n");
+		return -EINVAL;
+	}
+	/*
+	 * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
+	 * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
+	 * target_core_fabric_configfs.c WWN+TPG group context code.
+	 */
+	if (!(tfo->fabric_make_wwn)) {
+		printk(KERN_ERR "Missing tfo->fabric_make_wwn()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->fabric_drop_wwn)) {
+		printk(KERN_ERR "Missing tfo->fabric_drop_wwn()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->fabric_make_tpg)) {
+		printk(KERN_ERR "Missing tfo->fabric_make_tpg()\n");
+		return -EINVAL;
+	}
+	if (!(tfo->fabric_drop_tpg)) {
+		printk(KERN_ERR "Missing tfo->fabric_drop_tpg()\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * Called 2nd from fabric module with returned parameter of
+ * struct target_fabric_configfs * from target_fabric_configfs_init().
+ *
+ * Upon a successful registration, the new fabric's struct config_item is
+ * return.  Also, a pointer to this struct is set in the passed
+ * struct target_fabric_configfs.
+ */
+int target_fabric_configfs_register(
+	struct target_fabric_configfs *tf)
+{
+	struct config_group *su_group;
+	int ret;
+
+	if (!(tf)) {
+		printk(KERN_ERR "Unable to locate target_fabric_configfs"
+			" pointer\n");
+		return -EINVAL;
+	}
+	if (!(tf->tf_subsys)) {
+		printk(KERN_ERR "Unable to target struct config_subsystem"
+			" pointer\n");
+		return -EINVAL;
+	}
+	su_group = &tf->tf_subsys->su_group;
+	if (!(su_group)) {
+		printk(KERN_ERR "Unable to locate target struct config_group"
+			" pointer\n");
+		return -EINVAL;
+	}
+	ret = target_fabric_tf_ops_check(tf);
+	if (ret < 0)
+		return ret;
+
+	printk(KERN_INFO "<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>"
+		">>>>>>>>>>\n");
+	return 0;
+}
+EXPORT_SYMBOL(target_fabric_configfs_register);
+
+void target_fabric_configfs_deregister(
+	struct target_fabric_configfs *tf)
+{
+	struct config_group *su_group;
+	struct configfs_subsystem *su;
+
+	if (!(tf)) {
+		printk(KERN_ERR "Unable to locate passed target_fabric_"
+			"configfs\n");
+		return;
+	}
+	su = tf->tf_subsys;
+	if (!(su)) {
+		printk(KERN_ERR "Unable to locate passed tf->tf_subsys"
+			" pointer\n");
+		return;
+	}
+	su_group = &tf->tf_subsys->su_group;
+	if (!(su_group)) {
+		printk(KERN_ERR "Unable to locate target struct config_group"
+			" pointer\n");
+		return;
+	}
+
+	printk(KERN_INFO "<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>"
+			">>>>>>>>>>>>\n");
+	mutex_lock(&g_tf_lock);
+	if (atomic_read(&tf->tf_access_cnt)) {
+		mutex_unlock(&g_tf_lock);
+		printk(KERN_ERR "Non zero tf->tf_access_cnt for fabric %s\n",
+			tf->tf_name);
+		BUG();
+	}
+	list_del(&tf->tf_list);
+	mutex_unlock(&g_tf_lock);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: DEREGISTER -> Releasing tf:"
+			" %s\n", tf->tf_name);
+	tf->tf_module = NULL;
+	tf->tf_subsys = NULL;
+	kfree(tf);
+
+	printk("<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>"
+			">>>>>\n");
+	return;
+}
+EXPORT_SYMBOL(target_fabric_configfs_deregister);
+
+/*##############################################################################
+// Stop functions called by external Target Fabrics Modules
+//############################################################################*/
+
+/* Start functions for struct config_item_type target_core_dev_attrib_cit */
+
+#define DEF_DEV_ATTRIB_SHOW(_name)					\
+static ssize_t target_core_dev_show_attr_##_name(			\
+	struct se_dev_attrib *da,					\
+	char *page)							\
+{									\
+	struct se_device *dev;						\
+	struct se_subsystem_dev *se_dev = da->da_sub_dev;			\
+	ssize_t rb;							\
+									\
+	spin_lock(&se_dev->se_dev_lock);				\
+	dev = se_dev->se_dev_ptr;					\
+	if (!(dev)) {							\
+		spin_unlock(&se_dev->se_dev_lock); 			\
+		return -ENODEV;						\
+	}								\
+	rb = snprintf(page, PAGE_SIZE, "%u\n", (u32)DEV_ATTRIB(dev)->_name); \
+	spin_unlock(&se_dev->se_dev_lock);				\
+									\
+	return rb;							\
+}
+
+#define DEF_DEV_ATTRIB_STORE(_name)					\
+static ssize_t target_core_dev_store_attr_##_name(			\
+	struct se_dev_attrib *da,					\
+	const char *page,						\
+	size_t count)							\
+{									\
+	struct se_device *dev;						\
+	struct se_subsystem_dev *se_dev = da->da_sub_dev;			\
+	unsigned long val;						\
+	int ret;							\
+									\
+	spin_lock(&se_dev->se_dev_lock);				\
+	dev = se_dev->se_dev_ptr;					\
+	if (!(dev)) {							\
+		spin_unlock(&se_dev->se_dev_lock);			\
+		return -ENODEV;						\
+	}								\
+	ret = strict_strtoul(page, 0, &val);				\
+	if (ret < 0) {							\
+		spin_unlock(&se_dev->se_dev_lock);                      \
+		printk(KERN_ERR "strict_strtoul() failed with"		\
+			" ret: %d\n", ret);				\
+		return -EINVAL;						\
+	}								\
+	ret = se_dev_set_##_name(dev, (u32)val);			\
+	spin_unlock(&se_dev->se_dev_lock);				\
+									\
+	return (!ret) ? count : -EINVAL;				\
+}
+
+#define DEF_DEV_ATTRIB(_name)						\
+DEF_DEV_ATTRIB_SHOW(_name);						\
+DEF_DEV_ATTRIB_STORE(_name);
+
+#define DEF_DEV_ATTRIB_RO(_name)					\
+DEF_DEV_ATTRIB_SHOW(_name);
+
+CONFIGFS_EATTR_STRUCT(target_core_dev_attrib, se_dev_attrib);
+#define SE_DEV_ATTR(_name, _mode)					\
+static struct target_core_dev_attrib_attribute				\
+			target_core_dev_attrib_##_name =		\
+		__CONFIGFS_EATTR(_name, _mode,				\
+		target_core_dev_show_attr_##_name,			\
+		target_core_dev_store_attr_##_name);
+
+#define SE_DEV_ATTR_RO(_name);						\
+static struct target_core_dev_attrib_attribute				\
+			target_core_dev_attrib_##_name =		\
+	__CONFIGFS_EATTR_RO(_name,					\
+	target_core_dev_show_attr_##_name);
+
+DEF_DEV_ATTRIB(emulate_dpo);
+SE_DEV_ATTR(emulate_dpo, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(emulate_fua_write);
+SE_DEV_ATTR(emulate_fua_write, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(emulate_fua_read);
+SE_DEV_ATTR(emulate_fua_read, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(emulate_write_cache);
+SE_DEV_ATTR(emulate_write_cache, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(emulate_ua_intlck_ctrl);
+SE_DEV_ATTR(emulate_ua_intlck_ctrl, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(emulate_tas);
+SE_DEV_ATTR(emulate_tas, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(emulate_tpu);
+SE_DEV_ATTR(emulate_tpu, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(emulate_tpws);
+SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(enforce_pr_isids);
+SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB_RO(hw_block_size);
+SE_DEV_ATTR_RO(hw_block_size);
+
+DEF_DEV_ATTRIB(block_size);
+SE_DEV_ATTR(block_size, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB_RO(hw_max_sectors);
+SE_DEV_ATTR_RO(hw_max_sectors);
+
+DEF_DEV_ATTRIB(max_sectors);
+SE_DEV_ATTR(max_sectors, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(optimal_sectors);
+SE_DEV_ATTR(optimal_sectors, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB_RO(hw_queue_depth);
+SE_DEV_ATTR_RO(hw_queue_depth);
+
+DEF_DEV_ATTRIB(queue_depth);
+SE_DEV_ATTR(queue_depth, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(task_timeout);
+SE_DEV_ATTR(task_timeout, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(max_unmap_lba_count);
+SE_DEV_ATTR(max_unmap_lba_count, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(max_unmap_block_desc_count);
+SE_DEV_ATTR(max_unmap_block_desc_count, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(unmap_granularity);
+SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR);
+
+DEF_DEV_ATTRIB(unmap_granularity_alignment);
+SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR);
+
+CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);
+
+static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
+	&target_core_dev_attrib_emulate_dpo.attr,
+	&target_core_dev_attrib_emulate_fua_write.attr,
+	&target_core_dev_attrib_emulate_fua_read.attr,
+	&target_core_dev_attrib_emulate_write_cache.attr,
+	&target_core_dev_attrib_emulate_ua_intlck_ctrl.attr,
+	&target_core_dev_attrib_emulate_tas.attr,
+	&target_core_dev_attrib_emulate_tpu.attr,
+	&target_core_dev_attrib_emulate_tpws.attr,
+	&target_core_dev_attrib_enforce_pr_isids.attr,
+	&target_core_dev_attrib_hw_block_size.attr,
+	&target_core_dev_attrib_block_size.attr,
+	&target_core_dev_attrib_hw_max_sectors.attr,
+	&target_core_dev_attrib_max_sectors.attr,
+	&target_core_dev_attrib_optimal_sectors.attr,
+	&target_core_dev_attrib_hw_queue_depth.attr,
+	&target_core_dev_attrib_queue_depth.attr,
+	&target_core_dev_attrib_task_timeout.attr,
+	&target_core_dev_attrib_max_unmap_lba_count.attr,
+	&target_core_dev_attrib_max_unmap_block_desc_count.attr,
+	&target_core_dev_attrib_unmap_granularity.attr,
+	&target_core_dev_attrib_unmap_granularity_alignment.attr,
+	NULL,
+};
+
+static struct configfs_item_operations target_core_dev_attrib_ops = {
+	.show_attribute		= target_core_dev_attrib_attr_show,
+	.store_attribute	= target_core_dev_attrib_attr_store,
+};
+
+static struct config_item_type target_core_dev_attrib_cit = {
+	.ct_item_ops		= &target_core_dev_attrib_ops,
+	.ct_attrs		= target_core_dev_attrib_attrs,
+	.ct_owner		= THIS_MODULE,
+};
+
+/* End functions for struct config_item_type target_core_dev_attrib_cit */
+
+/*  Start functions for struct config_item_type target_core_dev_wwn_cit */
+
+CONFIGFS_EATTR_STRUCT(target_core_dev_wwn, t10_wwn);
+#define SE_DEV_WWN_ATTR(_name, _mode)					\
+static struct target_core_dev_wwn_attribute target_core_dev_wwn_##_name = \
+		__CONFIGFS_EATTR(_name, _mode,				\
+		target_core_dev_wwn_show_attr_##_name,			\
+		target_core_dev_wwn_store_attr_##_name);
+
+#define SE_DEV_WWN_ATTR_RO(_name);					\
+do {									\
+	static struct target_core_dev_wwn_attribute			\
+			target_core_dev_wwn_##_name =			\
+		__CONFIGFS_EATTR_RO(_name,				\
+		target_core_dev_wwn_show_attr_##_name);			\
+} while (0);
+
+/*
+ * VPD page 0x80 Unit serial
+ */
+static ssize_t target_core_dev_wwn_show_attr_vpd_unit_serial(
+	struct t10_wwn *t10_wwn,
+	char *page)
+{
+	struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
+	struct se_device *dev;
+
+	dev = se_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
+		&t10_wwn->unit_serial[0]);
+}
+
+static ssize_t target_core_dev_wwn_store_attr_vpd_unit_serial(
+	struct t10_wwn *t10_wwn,
+	const char *page,
+	size_t count)
+{
+	struct se_subsystem_dev *su_dev = t10_wwn->t10_sub_dev;
+	struct se_device *dev;
+	unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
+
+	/*
+	 * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
+	 * from the struct scsi_device level firmware, do not allow
+	 * VPD Unit Serial to be emulated.
+	 *
+	 * Note this struct scsi_device could also be emulating VPD
+	 * information from its drivers/scsi LLD.  But for now we assume
+	 * it is doing 'the right thing' wrt a world wide unique
+	 * VPD Unit Serial Number that OS dependent multipath can depend on.
+	 */
+	if (su_dev->su_dev_flags & SDF_FIRMWARE_VPD_UNIT_SERIAL) {
+		printk(KERN_ERR "Underlying SCSI device firmware provided VPD"
+			" Unit Serial, ignoring request\n");
+		return -EOPNOTSUPP;
+	}
+
+	if ((strlen(page) + 1) > INQUIRY_VPD_SERIAL_LEN) {
+		printk(KERN_ERR "Emulated VPD Unit Serial exceeds"
+		" INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
+		return -EOVERFLOW;
+	}
+	/*
+	 * Check to see if any active $FABRIC_MOD exports exist.  If they
+	 * do exist, fail here as changing this information on the fly
+	 * (underneath the initiator side OS dependent multipath code)
+	 * could cause negative effects.
+	 */
+	dev = su_dev->se_dev_ptr;
+	if ((dev)) {
+		if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+			printk(KERN_ERR "Unable to set VPD Unit Serial while"
+				" active %d $FABRIC_MOD exports exist\n",
+				atomic_read(&dev->dev_export_obj.obj_access_count));
+			return -EINVAL;
+		}
+	}
+	/*
+	 * This currently assumes ASCII encoding for emulated VPD Unit Serial.
+	 *
+	 * Also, strip any newline added from the userspace
+	 * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
+	 */
+	memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
+	snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
+	snprintf(su_dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
+			"%s", strstrip(buf));
+	su_dev->su_dev_flags |= SDF_EMULATED_VPD_UNIT_SERIAL;
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
+			" %s\n", su_dev->t10_wwn.unit_serial);
+
+	return count;
+}
+
+SE_DEV_WWN_ATTR(vpd_unit_serial, S_IRUGO | S_IWUSR);
+
+/*
+ * VPD page 0x83 Protocol Identifier
+ */
+static ssize_t target_core_dev_wwn_show_attr_vpd_protocol_identifier(
+	struct t10_wwn *t10_wwn,
+	char *page)
+{
+	struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;
+	struct se_device *dev;
+	struct t10_vpd *vpd;
+	unsigned char buf[VPD_TMP_BUF_SIZE];
+	ssize_t len = 0;
+
+	dev = se_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	memset(buf, 0, VPD_TMP_BUF_SIZE);
+
+	spin_lock(&t10_wwn->t10_vpd_lock);
+	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
+		if (!(vpd->protocol_identifier_set))
+			continue;
+
+		transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
+
+		if ((len + strlen(buf) > PAGE_SIZE))
+			break;
+
+		len += sprintf(page+len, "%s", buf);
+	}
+	spin_unlock(&t10_wwn->t10_vpd_lock);
+
+	return len;
+}
+
+static ssize_t target_core_dev_wwn_store_attr_vpd_protocol_identifier(
+	struct t10_wwn *t10_wwn,
+	const char *page,
+	size_t count)
+{
+	return -ENOSYS;
+}
+
+SE_DEV_WWN_ATTR(vpd_protocol_identifier, S_IRUGO | S_IWUSR);
+
+/*
+ * Generic wrapper for dumping VPD identifiers by association.
+ */
+#define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)				\
+static ssize_t target_core_dev_wwn_show_attr_##_name(			\
+	struct t10_wwn *t10_wwn,					\
+	char *page)							\
+{									\
+	struct se_subsystem_dev *se_dev = t10_wwn->t10_sub_dev;		\
+	struct se_device *dev;						\
+	struct t10_vpd *vpd;							\
+	unsigned char buf[VPD_TMP_BUF_SIZE];				\
+	ssize_t len = 0;						\
+									\
+	dev = se_dev->se_dev_ptr;					\
+	if (!(dev))							\
+		return -ENODEV;						\
+									\
+	spin_lock(&t10_wwn->t10_vpd_lock);				\
+	list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {	\
+		if (vpd->association != _assoc)				\
+			continue;					\
+									\
+		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
+		transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);	\
+		if ((len + strlen(buf) > PAGE_SIZE))			\
+			break;						\
+		len += sprintf(page+len, "%s", buf);			\
+									\
+		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
+		transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
+		if ((len + strlen(buf) > PAGE_SIZE))			\
+			break;						\
+		len += sprintf(page+len, "%s", buf);			\
+									\
+		memset(buf, 0, VPD_TMP_BUF_SIZE);			\
+		transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
+		if ((len + strlen(buf) > PAGE_SIZE))			\
+			break;						\
+		len += sprintf(page+len, "%s", buf);			\
+	}								\
+	spin_unlock(&t10_wwn->t10_vpd_lock);				\
+									\
+	return len;							\
+}
+
+/*
+ * VPD page 0x83 Assoication: Logical Unit
+ */
+DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
+
+static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_logical_unit(
+	struct t10_wwn *t10_wwn,
+	const char *page,
+	size_t count)
+{
+	return -ENOSYS;
+}
+
+SE_DEV_WWN_ATTR(vpd_assoc_logical_unit, S_IRUGO | S_IWUSR);
+
+/*
+ * VPD page 0x83 Association: Target Port
+ */
+DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
+
+static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_target_port(
+	struct t10_wwn *t10_wwn,
+	const char *page,
+	size_t count)
+{
+	return -ENOSYS;
+}
+
+SE_DEV_WWN_ATTR(vpd_assoc_target_port, S_IRUGO | S_IWUSR);
+
+/*
+ * VPD page 0x83 Association: SCSI Target Device
+ */
+DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
+
+static ssize_t target_core_dev_wwn_store_attr_vpd_assoc_scsi_target_device(
+	struct t10_wwn *t10_wwn,
+	const char *page,
+	size_t count)
+{
+	return -ENOSYS;
+}
+
+SE_DEV_WWN_ATTR(vpd_assoc_scsi_target_device, S_IRUGO | S_IWUSR);
+
+CONFIGFS_EATTR_OPS(target_core_dev_wwn, t10_wwn, t10_wwn_group);
+
+static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
+	&target_core_dev_wwn_vpd_unit_serial.attr,
+	&target_core_dev_wwn_vpd_protocol_identifier.attr,
+	&target_core_dev_wwn_vpd_assoc_logical_unit.attr,
+	&target_core_dev_wwn_vpd_assoc_target_port.attr,
+	&target_core_dev_wwn_vpd_assoc_scsi_target_device.attr,
+	NULL,
+};
+
+static struct configfs_item_operations target_core_dev_wwn_ops = {
+	.show_attribute		= target_core_dev_wwn_attr_show,
+	.store_attribute	= target_core_dev_wwn_attr_store,
+};
+
+static struct config_item_type target_core_dev_wwn_cit = {
+	.ct_item_ops		= &target_core_dev_wwn_ops,
+	.ct_attrs		= target_core_dev_wwn_attrs,
+	.ct_owner		= THIS_MODULE,
+};
+
+/*  End functions for struct config_item_type target_core_dev_wwn_cit */
+
+/*  Start functions for struct config_item_type target_core_dev_pr_cit */
+
+CONFIGFS_EATTR_STRUCT(target_core_dev_pr, se_subsystem_dev);
+#define SE_DEV_PR_ATTR(_name, _mode)					\
+static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \
+	__CONFIGFS_EATTR(_name, _mode,					\
+	target_core_dev_pr_show_attr_##_name,				\
+	target_core_dev_pr_store_attr_##_name);
+
+#define SE_DEV_PR_ATTR_RO(_name);					\
+static struct target_core_dev_pr_attribute target_core_dev_pr_##_name =	\
+	__CONFIGFS_EATTR_RO(_name,					\
+	target_core_dev_pr_show_attr_##_name);
+
+/*
+ * res_holder
+ */
+static ssize_t target_core_dev_pr_show_spc3_res(
+	struct se_device *dev,
+	char *page,
+	ssize_t *len)
+{
+	struct se_node_acl *se_nacl;
+	struct t10_pr_registration *pr_reg;
+	char i_buf[PR_REG_ISID_ID_LEN];
+	int prf_isid;
+
+	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+
+	spin_lock(&dev->dev_reservation_lock);
+	pr_reg = dev->dev_pr_res_holder;
+	if (!(pr_reg)) {
+		*len += sprintf(page + *len, "No SPC-3 Reservation holder\n");
+		spin_unlock(&dev->dev_reservation_lock);
+		return *len;
+	}
+	se_nacl = pr_reg->pr_reg_nacl;
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+
+	*len += sprintf(page + *len, "SPC-3 Reservation: %s Initiator: %s%s\n",
+		TPG_TFO(se_nacl->se_tpg)->get_fabric_name(),
+		se_nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return *len;
+}
+
+static ssize_t target_core_dev_pr_show_spc2_res(
+	struct se_device *dev,
+	char *page,
+	ssize_t *len)
+{
+	struct se_node_acl *se_nacl;
+
+	spin_lock(&dev->dev_reservation_lock);
+	se_nacl = dev->dev_reserved_node_acl;
+	if (!(se_nacl)) {
+		*len += sprintf(page + *len, "No SPC-2 Reservation holder\n");
+		spin_unlock(&dev->dev_reservation_lock);
+		return *len;
+	}
+	*len += sprintf(page + *len, "SPC-2 Reservation: %s Initiator: %s\n",
+		TPG_TFO(se_nacl->se_tpg)->get_fabric_name(),
+		se_nacl->initiatorname);
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return *len;
+}
+
+static ssize_t target_core_dev_pr_show_attr_res_holder(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	ssize_t len = 0;
+
+	if (!(su_dev->se_dev_ptr))
+		return -ENODEV;
+
+	switch (T10_RES(su_dev)->res_type) {
+	case SPC3_PERSISTENT_RESERVATIONS:
+		target_core_dev_pr_show_spc3_res(su_dev->se_dev_ptr,
+				page, &len);
+		break;
+	case SPC2_RESERVATIONS:
+		target_core_dev_pr_show_spc2_res(su_dev->se_dev_ptr,
+				page, &len);
+		break;
+	case SPC_PASSTHROUGH:
+		len += sprintf(page+len, "Passthrough\n");
+		break;
+	default:
+		len += sprintf(page+len, "Unknown\n");
+		break;
+	}
+
+	return len;
+}
+
+SE_DEV_PR_ATTR_RO(res_holder);
+
+/*
+ * res_pr_all_tgt_pts
+ */
+static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	struct se_device *dev;
+	struct t10_pr_registration *pr_reg;
+	ssize_t len = 0;
+
+	dev = su_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return len;
+
+	spin_lock(&dev->dev_reservation_lock);
+	pr_reg = dev->dev_pr_res_holder;
+	if (!(pr_reg)) {
+		len = sprintf(page, "No SPC-3 Reservation holder\n");
+		spin_unlock(&dev->dev_reservation_lock);
+		return len;
+	}
+	/*
+	 * See All Target Ports (ALL_TG_PT) bit in spcr17, section 6.14.3
+	 * Basic PERSISTENT RESERVER OUT parameter list, page 290
+	 */
+	if (pr_reg->pr_reg_all_tg_pt)
+		len = sprintf(page, "SPC-3 Reservation: All Target"
+			" Ports registration\n");
+	else
+		len = sprintf(page, "SPC-3 Reservation: Single"
+			" Target Port registration\n");
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return len;
+}
+
+SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts);
+
+/*
+ * res_pr_generation
+ */
+static ssize_t target_core_dev_pr_show_attr_res_pr_generation(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	if (!(su_dev->se_dev_ptr))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return 0;
+
+	return sprintf(page, "0x%08x\n", T10_RES(su_dev)->pr_generation);
+}
+
+SE_DEV_PR_ATTR_RO(res_pr_generation);
+
+/*
+ * res_pr_holder_tg_port
+ */
+static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	struct se_device *dev;
+	struct se_node_acl *se_nacl;
+	struct se_lun *lun;
+	struct se_portal_group *se_tpg;
+	struct t10_pr_registration *pr_reg;
+	struct target_core_fabric_ops *tfo;
+	ssize_t len = 0;
+
+	dev = su_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return len;
+
+	spin_lock(&dev->dev_reservation_lock);
+	pr_reg = dev->dev_pr_res_holder;
+	if (!(pr_reg)) {
+		len = sprintf(page, "No SPC-3 Reservation holder\n");
+		spin_unlock(&dev->dev_reservation_lock);
+		return len;
+	}
+	se_nacl = pr_reg->pr_reg_nacl;
+	se_tpg = se_nacl->se_tpg;
+	lun = pr_reg->pr_reg_tg_pt_lun;
+	tfo = TPG_TFO(se_tpg);
+
+	len += sprintf(page+len, "SPC-3 Reservation: %s"
+		" Target Node Endpoint: %s\n", tfo->get_fabric_name(),
+		tfo->tpg_get_wwn(se_tpg));
+	len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
+		" Identifer Tag: %hu %s Portal Group Tag: %hu"
+		" %s Logical Unit: %u\n", lun->lun_sep->sep_rtpi,
+		tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
+		tfo->get_fabric_name(), lun->unpacked_lun);
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return len;
+}
+
+SE_DEV_PR_ATTR_RO(res_pr_holder_tg_port);
+
+/*
+ * res_pr_registered_i_pts
+ */
+static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	struct target_core_fabric_ops *tfo;
+	struct t10_pr_registration *pr_reg;
+	unsigned char buf[384];
+	char i_buf[PR_REG_ISID_ID_LEN];
+	ssize_t len = 0;
+	int reg_count = 0, prf_isid;
+
+	if (!(su_dev->se_dev_ptr))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return len;
+
+	len += sprintf(page+len, "SPC-3 PR Registrations:\n");
+
+	spin_lock(&T10_RES(su_dev)->registration_lock);
+	list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list,
+			pr_reg_list) {
+
+		memset(buf, 0, 384);
+		memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+		tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
+		prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+					PR_REG_ISID_ID_LEN);
+		sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
+			tfo->get_fabric_name(),
+			pr_reg->pr_reg_nacl->initiatorname, (prf_isid) ?
+			&i_buf[0] : "", pr_reg->pr_res_key,
+			pr_reg->pr_res_generation);
+
+		if ((len + strlen(buf) > PAGE_SIZE))
+			break;
+
+		len += sprintf(page+len, "%s", buf);
+		reg_count++;
+	}
+	spin_unlock(&T10_RES(su_dev)->registration_lock);
+
+	if (!(reg_count))
+		len += sprintf(page+len, "None\n");
+
+	return len;
+}
+
+SE_DEV_PR_ATTR_RO(res_pr_registered_i_pts);
+
+/*
+ * res_pr_type
+ */
+static ssize_t target_core_dev_pr_show_attr_res_pr_type(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	struct se_device *dev;
+	struct t10_pr_registration *pr_reg;
+	ssize_t len = 0;
+
+	dev = su_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return len;
+
+	spin_lock(&dev->dev_reservation_lock);
+	pr_reg = dev->dev_pr_res_holder;
+	if (!(pr_reg)) {
+		len = sprintf(page, "No SPC-3 Reservation holder\n");
+		spin_unlock(&dev->dev_reservation_lock);
+		return len;
+	}
+	len = sprintf(page, "SPC-3 Reservation Type: %s\n",
+		core_scsi3_pr_dump_type(pr_reg->pr_res_type));
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return len;
+}
+
+SE_DEV_PR_ATTR_RO(res_pr_type);
+
+/*
+ * res_type
+ */
+static ssize_t target_core_dev_pr_show_attr_res_type(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	ssize_t len = 0;
+
+	if (!(su_dev->se_dev_ptr))
+		return -ENODEV;
+
+	switch (T10_RES(su_dev)->res_type) {
+	case SPC3_PERSISTENT_RESERVATIONS:
+		len = sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
+		break;
+	case SPC2_RESERVATIONS:
+		len = sprintf(page, "SPC2_RESERVATIONS\n");
+		break;
+	case SPC_PASSTHROUGH:
+		len = sprintf(page, "SPC_PASSTHROUGH\n");
+		break;
+	default:
+		len = sprintf(page, "UNKNOWN\n");
+		break;
+	}
+
+	return len;
+}
+
+SE_DEV_PR_ATTR_RO(res_type);
+
+/*
+ * res_aptpl_active
+ */
+
+static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	if (!(su_dev->se_dev_ptr))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return 0;
+
+	return sprintf(page, "APTPL Bit Status: %s\n",
+		(T10_RES(su_dev)->pr_aptpl_active) ? "Activated" : "Disabled");
+}
+
+SE_DEV_PR_ATTR_RO(res_aptpl_active);
+
+/*
+ * res_aptpl_metadata
+ */
+static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(
+	struct se_subsystem_dev *su_dev,
+	char *page)
+{
+	if (!(su_dev->se_dev_ptr))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return 0;
+
+	return sprintf(page, "Ready to process PR APTPL metadata..\n");
+}
+
+enum {
+	Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
+	Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
+	Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
+	Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_initiator_fabric, "initiator_fabric=%s"},
+	{Opt_initiator_node, "initiator_node=%s"},
+	{Opt_initiator_sid, "initiator_sid=%s"},
+	{Opt_sa_res_key, "sa_res_key=%s"},
+	{Opt_res_holder, "res_holder=%d"},
+	{Opt_res_type, "res_type=%d"},
+	{Opt_res_scope, "res_scope=%d"},
+	{Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
+	{Opt_mapped_lun, "mapped_lun=%d"},
+	{Opt_target_fabric, "target_fabric=%s"},
+	{Opt_target_node, "target_node=%s"},
+	{Opt_tpgt, "tpgt=%d"},
+	{Opt_port_rtpi, "port_rtpi=%d"},
+	{Opt_target_lun, "target_lun=%d"},
+	{Opt_err, NULL}
+};
+
+static ssize_t target_core_dev_pr_store_attr_res_aptpl_metadata(
+	struct se_subsystem_dev *su_dev,
+	const char *page,
+	size_t count)
+{
+	struct se_device *dev;
+	unsigned char *i_fabric, *t_fabric, *i_port = NULL, *t_port = NULL;
+	unsigned char *isid = NULL;
+	char *orig, *ptr, *arg_p, *opts;
+	substring_t args[MAX_OPT_ARGS];
+	unsigned long long tmp_ll;
+	u64 sa_res_key = 0;
+	u32 mapped_lun = 0, target_lun = 0;
+	int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
+	u16 port_rpti = 0, tpgt = 0;
+	u8 type = 0, scope;
+
+	dev = su_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return 0;
+
+	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+		printk(KERN_INFO "Unable to process APTPL metadata while"
+			" active fabric exports exist\n");
+		return -EINVAL;
+	}
+
+	opts = kstrdup(page, GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	orig = opts;
+	while ((ptr = strsep(&opts, ",")) != NULL) {
+		if (!*ptr)
+			continue;
+
+		token = match_token(ptr, tokens, args);
+		switch (token) {
+		case Opt_initiator_fabric:
+			i_fabric = match_strdup(&args[0]);
+			break;
+		case Opt_initiator_node:
+			i_port = match_strdup(&args[0]);
+			if (strlen(i_port) > PR_APTPL_MAX_IPORT_LEN) {
+				printk(KERN_ERR "APTPL metadata initiator_node="
+					" exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
+					PR_APTPL_MAX_IPORT_LEN);
+				ret = -EINVAL;
+				break;
+			}
+			break;
+		case Opt_initiator_sid:
+			isid = match_strdup(&args[0]);
+			if (strlen(isid) > PR_REG_ISID_LEN) {
+				printk(KERN_ERR "APTPL metadata initiator_isid"
+					"= exceeds PR_REG_ISID_LEN: %d\n",
+					PR_REG_ISID_LEN);
+				ret = -EINVAL;
+				break;
+			}
+			break;
+		case Opt_sa_res_key:
+			arg_p = match_strdup(&args[0]);
+			ret = strict_strtoull(arg_p, 0, &tmp_ll);
+			if (ret < 0) {
+				printk(KERN_ERR "strict_strtoull() failed for"
+					" sa_res_key=\n");
+				goto out;
+			}
+			sa_res_key = (u64)tmp_ll;
+			break;
+		/*
+		 * PR APTPL Metadata for Reservation
+		 */
+		case Opt_res_holder:
+			match_int(args, &arg);
+			res_holder = arg;
+			break;
+		case Opt_res_type:
+			match_int(args, &arg);
+			type = (u8)arg;
+			break;
+		case Opt_res_scope:
+			match_int(args, &arg);
+			scope = (u8)arg;
+			break;
+		case Opt_res_all_tg_pt:
+			match_int(args, &arg);
+			all_tg_pt = (int)arg;
+			break;
+		case Opt_mapped_lun:
+			match_int(args, &arg);
+			mapped_lun = (u32)arg;
+			break;
+		/*
+		 * PR APTPL Metadata for Target Port
+		 */
+		case Opt_target_fabric:
+			t_fabric = match_strdup(&args[0]);
+			break;
+		case Opt_target_node:
+			t_port = match_strdup(&args[0]);
+			if (strlen(t_port) > PR_APTPL_MAX_TPORT_LEN) {
+				printk(KERN_ERR "APTPL metadata target_node="
+					" exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
+					PR_APTPL_MAX_TPORT_LEN);
+				ret = -EINVAL;
+				break;
+			}
+			break;
+		case Opt_tpgt:
+			match_int(args, &arg);
+			tpgt = (u16)arg;
+			break;
+		case Opt_port_rtpi:
+			match_int(args, &arg);
+			port_rpti = (u16)arg;
+			break;
+		case Opt_target_lun:
+			match_int(args, &arg);
+			target_lun = (u32)arg;
+			break;
+		default:
+			break;
+		}
+	}
+
+	if (!(i_port) || !(t_port) || !(sa_res_key)) {
+		printk(KERN_ERR "Illegal parameters for APTPL registration\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (res_holder && !(type)) {
+		printk(KERN_ERR "Illegal PR type: 0x%02x for reservation"
+				" holder\n", type);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = core_scsi3_alloc_aptpl_registration(T10_RES(su_dev), sa_res_key,
+			i_port, isid, mapped_lun, t_port, tpgt, target_lun,
+			res_holder, all_tg_pt, type);
+out:
+	kfree(orig);
+	return (ret == 0) ? count : ret;
+}
+
+SE_DEV_PR_ATTR(res_aptpl_metadata, S_IRUGO | S_IWUSR);
+
+CONFIGFS_EATTR_OPS(target_core_dev_pr, se_subsystem_dev, se_dev_pr_group);
+
+static struct configfs_attribute *target_core_dev_pr_attrs[] = {
+	&target_core_dev_pr_res_holder.attr,
+	&target_core_dev_pr_res_pr_all_tgt_pts.attr,
+	&target_core_dev_pr_res_pr_generation.attr,
+	&target_core_dev_pr_res_pr_holder_tg_port.attr,
+	&target_core_dev_pr_res_pr_registered_i_pts.attr,
+	&target_core_dev_pr_res_pr_type.attr,
+	&target_core_dev_pr_res_type.attr,
+	&target_core_dev_pr_res_aptpl_active.attr,
+	&target_core_dev_pr_res_aptpl_metadata.attr,
+	NULL,
+};
+
+static struct configfs_item_operations target_core_dev_pr_ops = {
+	.show_attribute		= target_core_dev_pr_attr_show,
+	.store_attribute	= target_core_dev_pr_attr_store,
+};
+
+static struct config_item_type target_core_dev_pr_cit = {
+	.ct_item_ops		= &target_core_dev_pr_ops,
+	.ct_attrs		= target_core_dev_pr_attrs,
+	.ct_owner		= THIS_MODULE,
+};
+
+/*  End functions for struct config_item_type target_core_dev_pr_cit */
+
+/*  Start functions for struct config_item_type target_core_dev_cit */
+
+static ssize_t target_core_show_dev_info(void *p, char *page)
+{
+	struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
+	struct se_hba *hba = se_dev->se_dev_hba;
+	struct se_subsystem_api *t = hba->transport;
+	int bl = 0;
+	ssize_t read_bytes = 0;
+
+	if (!(se_dev->se_dev_ptr))
+		return -ENODEV;
+
+	transport_dump_dev_state(se_dev->se_dev_ptr, page, &bl);
+	read_bytes += bl;
+	read_bytes += t->show_configfs_dev_params(hba, se_dev, page+read_bytes);
+	return read_bytes;
+}
+
+static struct target_core_configfs_attribute target_core_attr_dev_info = {
+	.attr	= { .ca_owner = THIS_MODULE,
+		    .ca_name = "info",
+		    .ca_mode = S_IRUGO },
+	.show	= target_core_show_dev_info,
+	.store	= NULL,
+};
+
+static ssize_t target_core_store_dev_control(
+	void *p,
+	const char *page,
+	size_t count)
+{
+	struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
+	struct se_hba *hba = se_dev->se_dev_hba;
+	struct se_subsystem_api *t = hba->transport;
+
+	if (!(se_dev->se_dev_su_ptr)) {
+		printk(KERN_ERR "Unable to locate struct se_subsystem_dev>se"
+				"_dev_su_ptr\n");
+		return -EINVAL;
+	}
+
+	return t->set_configfs_dev_params(hba, se_dev, page, count);
+}
+
+static struct target_core_configfs_attribute target_core_attr_dev_control = {
+	.attr	= { .ca_owner = THIS_MODULE,
+		    .ca_name = "control",
+		    .ca_mode = S_IWUSR },
+	.show	= NULL,
+	.store	= target_core_store_dev_control,
+};
+
+static ssize_t target_core_show_dev_alias(void *p, char *page)
+{
+	struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
+
+	if (!(se_dev->su_dev_flags & SDF_USING_ALIAS))
+		return 0;
+
+	return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_alias);
+}
+
+static ssize_t target_core_store_dev_alias(
+	void *p,
+	const char *page,
+	size_t count)
+{
+	struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
+	struct se_hba *hba = se_dev->se_dev_hba;
+	ssize_t read_bytes;
+
+	if (count > (SE_DEV_ALIAS_LEN-1)) {
+		printk(KERN_ERR "alias count: %d exceeds"
+			" SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
+			SE_DEV_ALIAS_LEN-1);
+		return -EINVAL;
+	}
+
+	se_dev->su_dev_flags |= SDF_USING_ALIAS;
+	read_bytes = snprintf(&se_dev->se_dev_alias[0], SE_DEV_ALIAS_LEN,
+			"%s", page);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: %s/%s set alias: %s\n",
+		config_item_name(&hba->hba_group.cg_item),
+		config_item_name(&se_dev->se_dev_group.cg_item),
+		se_dev->se_dev_alias);
+
+	return read_bytes;
+}
+
+static struct target_core_configfs_attribute target_core_attr_dev_alias = {
+	.attr	= { .ca_owner = THIS_MODULE,
+		    .ca_name = "alias",
+		    .ca_mode =  S_IRUGO | S_IWUSR },
+	.show	= target_core_show_dev_alias,
+	.store	= target_core_store_dev_alias,
+};
+
+static ssize_t target_core_show_dev_udev_path(void *p, char *page)
+{
+	struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
+
+	if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH))
+		return 0;
+
+	return snprintf(page, PAGE_SIZE, "%s\n", se_dev->se_dev_udev_path);
+}
+
+static ssize_t target_core_store_dev_udev_path(
+	void *p,
+	const char *page,
+	size_t count)
+{
+	struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
+	struct se_hba *hba = se_dev->se_dev_hba;
+	ssize_t read_bytes;
+
+	if (count > (SE_UDEV_PATH_LEN-1)) {
+		printk(KERN_ERR "udev_path count: %d exceeds"
+			" SE_UDEV_PATH_LEN-1: %u\n", (int)count,
+			SE_UDEV_PATH_LEN-1);
+		return -EINVAL;
+	}
+
+	se_dev->su_dev_flags |= SDF_USING_UDEV_PATH;
+	read_bytes = snprintf(&se_dev->se_dev_udev_path[0], SE_UDEV_PATH_LEN,
+			"%s", page);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
+		config_item_name(&hba->hba_group.cg_item),
+		config_item_name(&se_dev->se_dev_group.cg_item),
+		se_dev->se_dev_udev_path);
+
+	return read_bytes;
+}
+
+static struct target_core_configfs_attribute target_core_attr_dev_udev_path = {
+	.attr	= { .ca_owner = THIS_MODULE,
+		    .ca_name = "udev_path",
+		    .ca_mode =  S_IRUGO | S_IWUSR },
+	.show	= target_core_show_dev_udev_path,
+	.store	= target_core_store_dev_udev_path,
+};
+
+static ssize_t target_core_store_dev_enable(
+	void *p,
+	const char *page,
+	size_t count)
+{
+	struct se_subsystem_dev *se_dev = (struct se_subsystem_dev *)p;
+	struct se_device *dev;
+	struct se_hba *hba = se_dev->se_dev_hba;
+	struct se_subsystem_api *t = hba->transport;
+	char *ptr;
+
+	ptr = strstr(page, "1");
+	if (!(ptr)) {
+		printk(KERN_ERR "For dev_enable ops, only valid value"
+				" is \"1\"\n");
+		return -EINVAL;
+	}
+	if ((se_dev->se_dev_ptr)) {
+		printk(KERN_ERR "se_dev->se_dev_ptr already set for storage"
+				" object\n");
+		return -EEXIST;
+	}
+
+	if (t->check_configfs_dev_params(hba, se_dev) < 0)
+		return -EINVAL;
+
+	dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
+	if (!(dev) || IS_ERR(dev))
+		return -EINVAL;
+
+	se_dev->se_dev_ptr = dev;
+	printk(KERN_INFO "Target_Core_ConfigFS: Registered se_dev->se_dev_ptr:"
+		" %p\n", se_dev->se_dev_ptr);
+
+	return count;
+}
+
+static struct target_core_configfs_attribute target_core_attr_dev_enable = {
+	.attr	= { .ca_owner = THIS_MODULE,
+		    .ca_name = "enable",
+		    .ca_mode = S_IWUSR },
+	.show	= NULL,
+	.store	= target_core_store_dev_enable,
+};
+
+static ssize_t target_core_show_alua_lu_gp(void *p, char *page)
+{
+	struct se_device *dev;
+	struct se_subsystem_dev *su_dev = (struct se_subsystem_dev *)p;
+	struct config_item *lu_ci;
+	struct t10_alua_lu_gp *lu_gp;
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+	ssize_t len = 0;
+
+	dev = su_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	if (T10_ALUA(su_dev)->alua_type != SPC3_ALUA_EMULATED)
+		return len;
+
+	lu_gp_mem = dev->dev_alua_lu_gp_mem;
+	if (!(lu_gp_mem)) {
+		printk(KERN_ERR "NULL struct se_device->dev_alua_lu_gp_mem"
+				" pointer\n");
+		return -EINVAL;
+	}
+
+	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
+	lu_gp = lu_gp_mem->lu_gp;
+	if ((lu_gp)) {
+		lu_ci = &lu_gp->lu_gp_group.cg_item;
+		len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
+			config_item_name(lu_ci), lu_gp->lu_gp_id);
+	}
+	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+	return len;
+}
+
+static ssize_t target_core_store_alua_lu_gp(
+	void *p,
+	const char *page,
+	size_t count)
+{
+	struct se_device *dev;
+	struct se_subsystem_dev *su_dev = (struct se_subsystem_dev *)p;
+	struct se_hba *hba = su_dev->se_dev_hba;
+	struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+	unsigned char buf[LU_GROUP_NAME_BUF];
+	int move = 0;
+
+	dev = su_dev->se_dev_ptr;
+	if (!(dev))
+		return -ENODEV;
+
+	if (T10_ALUA(su_dev)->alua_type != SPC3_ALUA_EMULATED) {
+		printk(KERN_WARNING "SPC3_ALUA_EMULATED not enabled for %s/%s\n",
+			config_item_name(&hba->hba_group.cg_item),
+			config_item_name(&su_dev->se_dev_group.cg_item));
+		return -EINVAL;
+	}
+	if (count > LU_GROUP_NAME_BUF) {
+		printk(KERN_ERR "ALUA LU Group Alias too large!\n");
+		return -EINVAL;
+	}
+	memset(buf, 0, LU_GROUP_NAME_BUF);
+	memcpy(buf, page, count);
+	/*
+	 * Any ALUA logical unit alias besides "NULL" means we will be
+	 * making a new group association.
+	 */
+	if (strcmp(strstrip(buf), "NULL")) {
+		/*
+		 * core_alua_get_lu_gp_by_name() will increment reference to
+		 * struct t10_alua_lu_gp.  This reference is released with
+		 * core_alua_get_lu_gp_by_name below().
+		 */
+		lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
+		if (!(lu_gp_new))
+			return -ENODEV;
+	}
+	lu_gp_mem = dev->dev_alua_lu_gp_mem;
+	if (!(lu_gp_mem)) {
+		if (lu_gp_new)
+			core_alua_put_lu_gp_from_name(lu_gp_new);
+		printk(KERN_ERR "NULL struct se_device->dev_alua_lu_gp_mem"
+				" pointer\n");
+		return -EINVAL;
+	}
+
+	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
+	lu_gp = lu_gp_mem->lu_gp;
+	if ((lu_gp)) {
+		/*
+		 * Clearing an existing lu_gp association, and replacing
+		 * with NULL
+		 */
+		if (!(lu_gp_new)) {
+			printk(KERN_INFO "Target_Core_ConfigFS: Releasing %s/%s"
+				" from ALUA LU Group: core/alua/lu_gps/%s, ID:"
+				" %hu\n",
+				config_item_name(&hba->hba_group.cg_item),
+				config_item_name(&su_dev->se_dev_group.cg_item),
+				config_item_name(&lu_gp->lu_gp_group.cg_item),
+				lu_gp->lu_gp_id);
+
+			__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
+			spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+			return count;
+		}
+		/*
+		 * Removing existing association of lu_gp_mem with lu_gp
+		 */
+		__core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
+		move = 1;
+	}
+	/*
+	 * Associate lu_gp_mem with lu_gp_new.
+	 */
+	__core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
+	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
+		" core/alua/lu_gps/%s, ID: %hu\n",
+		(move) ? "Moving" : "Adding",
+		config_item_name(&hba->hba_group.cg_item),
+		config_item_name(&su_dev->se_dev_group.cg_item),
+		config_item_name(&lu_gp_new->lu_gp_group.cg_item),
+		lu_gp_new->lu_gp_id);
+
+	core_alua_put_lu_gp_from_name(lu_gp_new);
+	return count;
+}
+
+static struct target_core_configfs_attribute target_core_attr_dev_alua_lu_gp = {
+	.attr	= { .ca_owner = THIS_MODULE,
+		    .ca_name = "alua_lu_gp",
+		    .ca_mode = S_IRUGO | S_IWUSR },
+	.show	= target_core_show_alua_lu_gp,
+	.store	= target_core_store_alua_lu_gp,
+};
+
+static struct configfs_attribute *lio_core_dev_attrs[] = {
+	&target_core_attr_dev_info.attr,
+	&target_core_attr_dev_control.attr,
+	&target_core_attr_dev_alias.attr,
+	&target_core_attr_dev_udev_path.attr,
+	&target_core_attr_dev_enable.attr,
+	&target_core_attr_dev_alua_lu_gp.attr,
+	NULL,
+};
+
+static void target_core_dev_release(struct config_item *item)
+{
+	struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
+				struct se_subsystem_dev, se_dev_group);
+	struct config_group *dev_cg;
+
+	if (!(se_dev))
+		return;
+
+	dev_cg = &se_dev->se_dev_group;
+	kfree(dev_cg->default_groups);
+}
+
+static ssize_t target_core_dev_show(struct config_item *item,
+				     struct configfs_attribute *attr,
+				     char *page)
+{
+	struct se_subsystem_dev *se_dev = container_of(
+			to_config_group(item), struct se_subsystem_dev,
+			se_dev_group);
+	struct target_core_configfs_attribute *tc_attr = container_of(
+			attr, struct target_core_configfs_attribute, attr);
+
+	if (!(tc_attr->show))
+		return -EINVAL;
+
+	return tc_attr->show((void *)se_dev, page);
+}
+
+static ssize_t target_core_dev_store(struct config_item *item,
+				      struct configfs_attribute *attr,
+				      const char *page, size_t count)
+{
+	struct se_subsystem_dev *se_dev = container_of(
+			to_config_group(item), struct se_subsystem_dev,
+			se_dev_group);
+	struct target_core_configfs_attribute *tc_attr = container_of(
+			attr, struct target_core_configfs_attribute, attr);
+
+	if (!(tc_attr->store))
+		return -EINVAL;
+
+	return tc_attr->store((void *)se_dev, page, count);
+}
+
+static struct configfs_item_operations target_core_dev_item_ops = {
+	.release		= target_core_dev_release,
+	.show_attribute		= target_core_dev_show,
+	.store_attribute	= target_core_dev_store,
+};
+
+static struct config_item_type target_core_dev_cit = {
+	.ct_item_ops		= &target_core_dev_item_ops,
+	.ct_attrs		= lio_core_dev_attrs,
+	.ct_owner		= THIS_MODULE,
+};
+
+/* End functions for struct config_item_type target_core_dev_cit */
+
+/* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
+
+CONFIGFS_EATTR_STRUCT(target_core_alua_lu_gp, t10_alua_lu_gp);
+#define SE_DEV_ALUA_LU_ATTR(_name, _mode)				\
+static struct target_core_alua_lu_gp_attribute				\
+			target_core_alua_lu_gp_##_name =		\
+	__CONFIGFS_EATTR(_name, _mode,					\
+	target_core_alua_lu_gp_show_attr_##_name,			\
+	target_core_alua_lu_gp_store_attr_##_name);
+
+#define SE_DEV_ALUA_LU_ATTR_RO(_name)					\
+static struct target_core_alua_lu_gp_attribute				\
+			target_core_alua_lu_gp_##_name =		\
+	__CONFIGFS_EATTR_RO(_name,					\
+	target_core_alua_lu_gp_show_attr_##_name);
+
+/*
+ * lu_gp_id
+ */
+static ssize_t target_core_alua_lu_gp_show_attr_lu_gp_id(
+	struct t10_alua_lu_gp *lu_gp,
+	char *page)
+{
+	if (!(lu_gp->lu_gp_valid_id))
+		return 0;
+
+	return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
+}
+
+static ssize_t target_core_alua_lu_gp_store_attr_lu_gp_id(
+	struct t10_alua_lu_gp *lu_gp,
+	const char *page,
+	size_t count)
+{
+	struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
+	unsigned long lu_gp_id;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &lu_gp_id);
+	if (ret < 0) {
+		printk(KERN_ERR "strict_strtoul() returned %d for"
+			" lu_gp_id\n", ret);
+		return -EINVAL;
+	}
+	if (lu_gp_id > 0x0000ffff) {
+		printk(KERN_ERR "ALUA lu_gp_id: %lu exceeds maximum:"
+			" 0x0000ffff\n", lu_gp_id);
+		return -EINVAL;
+	}
+
+	ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
+	if (ret < 0)
+		return -EINVAL;
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Set ALUA Logical Unit"
+		" Group: core/alua/lu_gps/%s to ID: %hu\n",
+		config_item_name(&alua_lu_gp_cg->cg_item),
+		lu_gp->lu_gp_id);
+
+	return count;
+}
+
+SE_DEV_ALUA_LU_ATTR(lu_gp_id, S_IRUGO | S_IWUSR);
+
+/*
+ * members
+ */
+static ssize_t target_core_alua_lu_gp_show_attr_members(
+	struct t10_alua_lu_gp *lu_gp,
+	char *page)
+{
+	struct se_device *dev;
+	struct se_hba *hba;
+	struct se_subsystem_dev *su_dev;
+	struct t10_alua_lu_gp_member *lu_gp_mem;
+	ssize_t len = 0, cur_len;
+	unsigned char buf[LU_GROUP_NAME_BUF];
+
+	memset(buf, 0, LU_GROUP_NAME_BUF);
+
+	spin_lock(&lu_gp->lu_gp_lock);
+	list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
+		dev = lu_gp_mem->lu_gp_mem_dev;
+		su_dev = dev->se_sub_dev;
+		hba = su_dev->se_dev_hba;
+
+		cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
+			config_item_name(&hba->hba_group.cg_item),
+			config_item_name(&su_dev->se_dev_group.cg_item));
+		cur_len++; /* Extra byte for NULL terminator */
+
+		if ((cur_len + len) > PAGE_SIZE) {
+			printk(KERN_WARNING "Ran out of lu_gp_show_attr"
+				"_members buffer\n");
+			break;
+		}
+		memcpy(page+len, buf, cur_len);
+		len += cur_len;
+	}
+	spin_unlock(&lu_gp->lu_gp_lock);
+
+	return len;
+}
+
+SE_DEV_ALUA_LU_ATTR_RO(members);
+
+CONFIGFS_EATTR_OPS(target_core_alua_lu_gp, t10_alua_lu_gp, lu_gp_group);
+
+static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
+	&target_core_alua_lu_gp_lu_gp_id.attr,
+	&target_core_alua_lu_gp_members.attr,
+	NULL,
+};
+
+static struct configfs_item_operations target_core_alua_lu_gp_ops = {
+	.show_attribute		= target_core_alua_lu_gp_attr_show,
+	.store_attribute	= target_core_alua_lu_gp_attr_store,
+};
+
+static struct config_item_type target_core_alua_lu_gp_cit = {
+	.ct_item_ops		= &target_core_alua_lu_gp_ops,
+	.ct_attrs		= target_core_alua_lu_gp_attrs,
+	.ct_owner		= THIS_MODULE,
+};
+
+/* End functions for struct config_item_type target_core_alua_lu_gp_cit */
+
+/* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
+
+static struct config_group *target_core_alua_create_lu_gp(
+	struct config_group *group,
+	const char *name)
+{
+	struct t10_alua_lu_gp *lu_gp;
+	struct config_group *alua_lu_gp_cg = NULL;
+	struct config_item *alua_lu_gp_ci = NULL;
+
+	lu_gp = core_alua_allocate_lu_gp(name, 0);
+	if (IS_ERR(lu_gp))
+		return NULL;
+
+	alua_lu_gp_cg = &lu_gp->lu_gp_group;
+	alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
+
+	config_group_init_type_name(alua_lu_gp_cg, name,
+			&target_core_alua_lu_gp_cit);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Allocated ALUA Logical Unit"
+		" Group: core/alua/lu_gps/%s\n",
+		config_item_name(alua_lu_gp_ci));
+
+	return alua_lu_gp_cg;
+
+}
+
+static void target_core_alua_drop_lu_gp(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
+			struct t10_alua_lu_gp, lu_gp_group);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Releasing ALUA Logical Unit"
+		" Group: core/alua/lu_gps/%s, ID: %hu\n",
+		config_item_name(item), lu_gp->lu_gp_id);
+
+	config_item_put(item);
+	core_alua_free_lu_gp(lu_gp);
+}
+
+static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
+	.make_group		= &target_core_alua_create_lu_gp,
+	.drop_item		= &target_core_alua_drop_lu_gp,
+};
+
+static struct config_item_type target_core_alua_lu_gps_cit = {
+	.ct_item_ops		= NULL,
+	.ct_group_ops		= &target_core_alua_lu_gps_group_ops,
+	.ct_owner		= THIS_MODULE,
+};
+
+/* End functions for struct config_item_type target_core_alua_lu_gps_cit */
+
+/* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
+
+CONFIGFS_EATTR_STRUCT(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp);
+#define SE_DEV_ALUA_TG_PT_ATTR(_name, _mode)				\
+static struct target_core_alua_tg_pt_gp_attribute			\
+			target_core_alua_tg_pt_gp_##_name =		\
+	__CONFIGFS_EATTR(_name, _mode,					\
+	target_core_alua_tg_pt_gp_show_attr_##_name,			\
+	target_core_alua_tg_pt_gp_store_attr_##_name);
+
+#define SE_DEV_ALUA_TG_PT_ATTR_RO(_name)				\
+static struct target_core_alua_tg_pt_gp_attribute			\
+			target_core_alua_tg_pt_gp_##_name =		\
+	__CONFIGFS_EATTR_RO(_name,					\
+	target_core_alua_tg_pt_gp_show_attr_##_name);
+
+/*
+ * alua_access_state
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_state(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return sprintf(page, "%d\n",
+		atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state));
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_state(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
+	unsigned long tmp;
+	int new_state, ret;
+
+	if (!(tg_pt_gp->tg_pt_gp_valid_id)) {
+		printk(KERN_ERR "Unable to do implict ALUA on non valid"
+			" tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
+		return -EINVAL;
+	}
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk("Unable to extract new ALUA access state from"
+				" %s\n", page);
+		return -EINVAL;
+	}
+	new_state = (int)tmp;
+
+	if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) {
+		printk(KERN_ERR "Unable to process implict configfs ALUA"
+			" transition while TPGS_IMPLICT_ALUA is diabled\n");
+		return -EINVAL;
+	}
+
+	ret = core_alua_do_port_transition(tg_pt_gp, su_dev->se_dev_ptr,
+					NULL, NULL, new_state, 0);
+	return (!ret) ? count : -EINVAL;
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(alua_access_state, S_IRUGO | S_IWUSR);
+
+/*
+ * alua_access_status
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_status(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return sprintf(page, "%s\n",
+		core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_status(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int new_status, ret;
+
+	if (!(tg_pt_gp->tg_pt_gp_valid_id)) {
+		printk(KERN_ERR "Unable to do set ALUA access status on non"
+			" valid tg_pt_gp ID: %hu\n",
+			tg_pt_gp->tg_pt_gp_valid_id);
+		return -EINVAL;
+	}
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract new ALUA access status"
+				" from %s\n", page);
+		return -EINVAL;
+	}
+	new_status = (int)tmp;
+
+	if ((new_status != ALUA_STATUS_NONE) &&
+	    (new_status != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
+	    (new_status != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
+		printk(KERN_ERR "Illegal ALUA access status: 0x%02x\n",
+				new_status);
+		return -EINVAL;
+	}
+
+	tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
+	return count;
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(alua_access_status, S_IRUGO | S_IWUSR);
+
+/*
+ * alua_access_type
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_access_type(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return core_alua_show_access_type(tg_pt_gp, page);
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_access_type(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	return core_alua_store_access_type(tg_pt_gp, page, count);
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(alua_access_type, S_IRUGO | S_IWUSR);
+
+/*
+ * alua_write_metadata
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_alua_write_metadata(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_write_metadata);
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_alua_write_metadata(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	unsigned long tmp;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tmp);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract alua_write_metadata\n");
+		return -EINVAL;
+	}
+
+	if ((tmp != 0) && (tmp != 1)) {
+		printk(KERN_ERR "Illegal value for alua_write_metadata:"
+			" %lu\n", tmp);
+		return -EINVAL;
+	}
+	tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
+
+	return count;
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(alua_write_metadata, S_IRUGO | S_IWUSR);
+
+
+
+/*
+ * nonop_delay_msecs
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_nonop_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return core_alua_show_nonop_delay_msecs(tg_pt_gp, page);
+
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_nonop_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	return core_alua_store_nonop_delay_msecs(tg_pt_gp, page, count);
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(nonop_delay_msecs, S_IRUGO | S_IWUSR);
+
+/*
+ * trans_delay_msecs
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_trans_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return core_alua_show_trans_delay_msecs(tg_pt_gp, page);
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_trans_delay_msecs(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	return core_alua_store_trans_delay_msecs(tg_pt_gp, page, count);
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(trans_delay_msecs, S_IRUGO | S_IWUSR);
+
+/*
+ * preferred
+ */
+
+static ssize_t target_core_alua_tg_pt_gp_show_attr_preferred(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	return core_alua_show_preferred_bit(tg_pt_gp, page);
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_preferred(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	return core_alua_store_preferred_bit(tg_pt_gp, page, count);
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(preferred, S_IRUGO | S_IWUSR);
+
+/*
+ * tg_pt_gp_id
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_tg_pt_gp_id(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	if (!(tg_pt_gp->tg_pt_gp_valid_id))
+		return 0;
+
+	return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
+}
+
+static ssize_t target_core_alua_tg_pt_gp_store_attr_tg_pt_gp_id(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	const char *page,
+	size_t count)
+{
+	struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
+	unsigned long tg_pt_gp_id;
+	int ret;
+
+	ret = strict_strtoul(page, 0, &tg_pt_gp_id);
+	if (ret < 0) {
+		printk(KERN_ERR "strict_strtoul() returned %d for"
+			" tg_pt_gp_id\n", ret);
+		return -EINVAL;
+	}
+	if (tg_pt_gp_id > 0x0000ffff) {
+		printk(KERN_ERR "ALUA tg_pt_gp_id: %lu exceeds maximum:"
+			" 0x0000ffff\n", tg_pt_gp_id);
+		return -EINVAL;
+	}
+
+	ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
+	if (ret < 0)
+		return -EINVAL;
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Set ALUA Target Port Group: "
+		"core/alua/tg_pt_gps/%s to ID: %hu\n",
+		config_item_name(&alua_tg_pt_gp_cg->cg_item),
+		tg_pt_gp->tg_pt_gp_id);
+
+	return count;
+}
+
+SE_DEV_ALUA_TG_PT_ATTR(tg_pt_gp_id, S_IRUGO | S_IWUSR);
+
+/*
+ * members
+ */
+static ssize_t target_core_alua_tg_pt_gp_show_attr_members(
+	struct t10_alua_tg_pt_gp *tg_pt_gp,
+	char *page)
+{
+	struct se_port *port;
+	struct se_portal_group *tpg;
+	struct se_lun *lun;
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
+	ssize_t len = 0, cur_len;
+	unsigned char buf[TG_PT_GROUP_NAME_BUF];
+
+	memset(buf, 0, TG_PT_GROUP_NAME_BUF);
+
+	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
+	list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
+			tg_pt_gp_mem_list) {
+		port = tg_pt_gp_mem->tg_pt;
+		tpg = port->sep_tpg;
+		lun = port->sep_lun;
+
+		cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
+			"/%s\n", TPG_TFO(tpg)->get_fabric_name(),
+			TPG_TFO(tpg)->tpg_get_wwn(tpg),
+			TPG_TFO(tpg)->tpg_get_tag(tpg),
+			config_item_name(&lun->lun_group.cg_item));
+		cur_len++; /* Extra byte for NULL terminator */
+
+		if ((cur_len + len) > PAGE_SIZE) {
+			printk(KERN_WARNING "Ran out of lu_gp_show_attr"
+				"_members buffer\n");
+			break;
+		}
+		memcpy(page+len, buf, cur_len);
+		len += cur_len;
+	}
+	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
+
+	return len;
+}
+
+SE_DEV_ALUA_TG_PT_ATTR_RO(members);
+
+CONFIGFS_EATTR_OPS(target_core_alua_tg_pt_gp, t10_alua_tg_pt_gp,
+			tg_pt_gp_group);
+
+static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
+	&target_core_alua_tg_pt_gp_alua_access_state.attr,
+	&target_core_alua_tg_pt_gp_alua_access_status.attr,
+	&target_core_alua_tg_pt_gp_alua_access_type.attr,
+	&target_core_alua_tg_pt_gp_alua_write_metadata.attr,
+	&target_core_alua_tg_pt_gp_nonop_delay_msecs.attr,
+	&target_core_alua_tg_pt_gp_trans_delay_msecs.attr,
+	&target_core_alua_tg_pt_gp_preferred.attr,
+	&target_core_alua_tg_pt_gp_tg_pt_gp_id.attr,
+	&target_core_alua_tg_pt_gp_members.attr,
+	NULL,
+};
+
+static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
+	.show_attribute		= target_core_alua_tg_pt_gp_attr_show,
+	.store_attribute	= target_core_alua_tg_pt_gp_attr_store,
+};
+
+static struct config_item_type target_core_alua_tg_pt_gp_cit = {
+	.ct_item_ops		= &target_core_alua_tg_pt_gp_ops,
+	.ct_attrs		= target_core_alua_tg_pt_gp_attrs,
+	.ct_owner		= THIS_MODULE,
+};
+
+/* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
+
+/* Start functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
+
+static struct config_group *target_core_alua_create_tg_pt_gp(
+	struct config_group *group,
+	const char *name)
+{
+	struct t10_alua *alua = container_of(group, struct t10_alua,
+					alua_tg_pt_gps_group);
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct se_subsystem_dev *su_dev = alua->t10_sub_dev;
+	struct config_group *alua_tg_pt_gp_cg = NULL;
+	struct config_item *alua_tg_pt_gp_ci = NULL;
+
+	tg_pt_gp = core_alua_allocate_tg_pt_gp(su_dev, name, 0);
+	if (!(tg_pt_gp))
+		return NULL;
+
+	alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
+	alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
+
+	config_group_init_type_name(alua_tg_pt_gp_cg, name,
+			&target_core_alua_tg_pt_gp_cit);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Allocated ALUA Target Port"
+		" Group: alua/tg_pt_gps/%s\n",
+		config_item_name(alua_tg_pt_gp_ci));
+
+	return alua_tg_pt_gp_cg;
+}
+
+static void target_core_alua_drop_tg_pt_gp(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
+			struct t10_alua_tg_pt_gp, tg_pt_gp_group);
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Releasing ALUA Target Port"
+		" Group: alua/tg_pt_gps/%s, ID: %hu\n",
+		config_item_name(item), tg_pt_gp->tg_pt_gp_id);
+
+	config_item_put(item);
+	core_alua_free_tg_pt_gp(tg_pt_gp);
+}
+
+static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
+	.make_group		= &target_core_alua_create_tg_pt_gp,
+	.drop_item		= &target_core_alua_drop_tg_pt_gp,
+};
+
+static struct config_item_type target_core_alua_tg_pt_gps_cit = {
+	.ct_group_ops		= &target_core_alua_tg_pt_gps_group_ops,
+	.ct_owner		= THIS_MODULE,
+};
+
+/* End functions for struct config_item_type target_core_alua_tg_pt_gps_cit */
+
+/* Start functions for struct config_item_type target_core_alua_cit */
+
+/*
+ * target_core_alua_cit is a ConfigFS group that lives under
+ * /sys/kernel/config/target/core/alua.  There are default groups
+ * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
+ * target_core_alua_cit in target_core_init_configfs() below.
+ */
+static struct config_item_type target_core_alua_cit = {
+	.ct_item_ops		= NULL,
+	.ct_attrs		= NULL,
+	.ct_owner		= THIS_MODULE,
+};
+
+/* End functions for struct config_item_type target_core_alua_cit */
+
+/* Start functions for struct config_item_type target_core_hba_cit */
+
+static struct config_group *target_core_make_subdev(
+	struct config_group *group,
+	const char *name)
+{
+	struct t10_alua_tg_pt_gp *tg_pt_gp;
+	struct se_subsystem_dev *se_dev;
+	struct se_subsystem_api *t;
+	struct config_item *hba_ci = &group->cg_item;
+	struct se_hba *hba = item_to_hba(hba_ci);
+	struct config_group *dev_cg = NULL, *tg_pt_gp_cg = NULL;
+
+	if (mutex_lock_interruptible(&hba->hba_access_mutex))
+		return NULL;
+
+	/*
+	 * Locate the struct se_subsystem_api from parent's struct se_hba.
+	 */
+	t = hba->transport;
+
+	se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
+	if (!se_dev) {
+		printk(KERN_ERR "Unable to allocate memory for"
+				" struct se_subsystem_dev\n");
+		goto unlock;
+	}
+	INIT_LIST_HEAD(&se_dev->g_se_dev_list);
+	INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
+	spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
+	INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
+	INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
+	spin_lock_init(&se_dev->t10_reservation.registration_lock);
+	spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
+	INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
+	spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
+	spin_lock_init(&se_dev->se_dev_lock);
+	se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
+	se_dev->t10_wwn.t10_sub_dev = se_dev;
+	se_dev->t10_alua.t10_sub_dev = se_dev;
+	se_dev->se_dev_attrib.da_sub_dev = se_dev;
+
+	se_dev->se_dev_hba = hba;
+	dev_cg = &se_dev->se_dev_group;
+
+	dev_cg->default_groups = kzalloc(sizeof(struct config_group) * 6,
+			GFP_KERNEL);
+	if (!(dev_cg->default_groups))
+		goto out;
+	/*
+	 * Set se_dev_su_ptr from struct se_subsystem_api returned void ptr
+	 * for ->allocate_virtdevice()
+	 *
+	 * se_dev->se_dev_ptr will be set after ->create_virtdev()
+	 * has been called successfully in the next level up in the
+	 * configfs tree for device object's struct config_group.
+	 */
+	se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, name);
+	if (!(se_dev->se_dev_su_ptr)) {
+		printk(KERN_ERR "Unable to locate subsystem dependent pointer"
+			" from allocate_virtdevice()\n");
+		goto out;
+	}
+	spin_lock(&se_global->g_device_lock);
+	list_add_tail(&se_dev->g_se_dev_list, &se_global->g_se_dev_list);
+	spin_unlock(&se_global->g_device_lock);
+
+	config_group_init_type_name(&se_dev->se_dev_group, name,
+			&target_core_dev_cit);
+	config_group_init_type_name(&se_dev->se_dev_attrib.da_group, "attrib",
+			&target_core_dev_attrib_cit);
+	config_group_init_type_name(&se_dev->se_dev_pr_group, "pr",
+			&target_core_dev_pr_cit);
+	config_group_init_type_name(&se_dev->t10_wwn.t10_wwn_group, "wwn",
+			&target_core_dev_wwn_cit);
+	config_group_init_type_name(&se_dev->t10_alua.alua_tg_pt_gps_group,
+			"alua", &target_core_alua_tg_pt_gps_cit);
+	dev_cg->default_groups[0] = &se_dev->se_dev_attrib.da_group;
+	dev_cg->default_groups[1] = &se_dev->se_dev_pr_group;
+	dev_cg->default_groups[2] = &se_dev->t10_wwn.t10_wwn_group;
+	dev_cg->default_groups[3] = &se_dev->t10_alua.alua_tg_pt_gps_group;
+	dev_cg->default_groups[4] = NULL;
+	/*
+	 * Add core/$HBA/$DEV/alua/tg_pt_gps/default_tg_pt_gp
+	 */
+	tg_pt_gp = core_alua_allocate_tg_pt_gp(se_dev, "default_tg_pt_gp", 1);
+	if (!(tg_pt_gp))
+		goto out;
+
+	tg_pt_gp_cg = &T10_ALUA(se_dev)->alua_tg_pt_gps_group;
+	tg_pt_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
+				GFP_KERNEL);
+	if (!(tg_pt_gp_cg->default_groups)) {
+		printk(KERN_ERR "Unable to allocate tg_pt_gp_cg->"
+				"default_groups\n");
+		goto out;
+	}
+
+	config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
+			"default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
+	tg_pt_gp_cg->default_groups[0] = &tg_pt_gp->tg_pt_gp_group;
+	tg_pt_gp_cg->default_groups[1] = NULL;
+	T10_ALUA(se_dev)->default_tg_pt_gp = tg_pt_gp;
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Allocated struct se_subsystem_dev:"
+		" %p se_dev_su_ptr: %p\n", se_dev, se_dev->se_dev_su_ptr);
+
+	mutex_unlock(&hba->hba_access_mutex);
+	return &se_dev->se_dev_group;
+out:
+	if (T10_ALUA(se_dev)->default_tg_pt_gp) {
+		core_alua_free_tg_pt_gp(T10_ALUA(se_dev)->default_tg_pt_gp);
+		T10_ALUA(se_dev)->default_tg_pt_gp = NULL;
+	}
+	if (tg_pt_gp_cg)
+		kfree(tg_pt_gp_cg->default_groups);
+	if (dev_cg)
+		kfree(dev_cg->default_groups);
+	if (se_dev->se_dev_su_ptr)
+		t->free_device(se_dev->se_dev_su_ptr);
+	kfree(se_dev);
+unlock:
+	mutex_unlock(&hba->hba_access_mutex);
+	return NULL;
+}
+
+static void target_core_drop_subdev(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
+				struct se_subsystem_dev, se_dev_group);
+	struct se_hba *hba;
+	struct se_subsystem_api *t;
+	struct config_item *df_item;
+	struct config_group *dev_cg, *tg_pt_gp_cg;
+	int i, ret;
+
+	hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
+
+	if (mutex_lock_interruptible(&hba->hba_access_mutex))
+		goto out;
+
+	t = hba->transport;
+
+	spin_lock(&se_global->g_device_lock);
+	list_del(&se_dev->g_se_dev_list);
+	spin_unlock(&se_global->g_device_lock);
+
+	tg_pt_gp_cg = &T10_ALUA(se_dev)->alua_tg_pt_gps_group;
+	for (i = 0; tg_pt_gp_cg->default_groups[i]; i++) {
+		df_item = &tg_pt_gp_cg->default_groups[i]->cg_item;
+		tg_pt_gp_cg->default_groups[i] = NULL;
+		config_item_put(df_item);
+	}
+	kfree(tg_pt_gp_cg->default_groups);
+	core_alua_free_tg_pt_gp(T10_ALUA(se_dev)->default_tg_pt_gp);
+	T10_ALUA(se_dev)->default_tg_pt_gp = NULL;
+
+	dev_cg = &se_dev->se_dev_group;
+	for (i = 0; dev_cg->default_groups[i]; i++) {
+		df_item = &dev_cg->default_groups[i]->cg_item;
+		dev_cg->default_groups[i] = NULL;
+		config_item_put(df_item);
+	}
+
+	config_item_put(item);
+	/*
+	 * This pointer will set when the storage is enabled with:
+	 * `echo 1 > $CONFIGFS/core/$HBA/$DEV/dev_enable`
+	 */
+	if (se_dev->se_dev_ptr) {
+		printk(KERN_INFO "Target_Core_ConfigFS: Calling se_free_"
+			"virtual_device() for se_dev_ptr: %p\n",
+				se_dev->se_dev_ptr);
+
+		ret = se_free_virtual_device(se_dev->se_dev_ptr, hba);
+		if (ret < 0)
+			goto hba_out;
+	} else {
+		/*
+		 * Release struct se_subsystem_dev->se_dev_su_ptr..
+		 */
+		printk(KERN_INFO "Target_Core_ConfigFS: Calling t->free_"
+			"device() for se_dev_su_ptr: %p\n",
+			se_dev->se_dev_su_ptr);
+
+		t->free_device(se_dev->se_dev_su_ptr);
+	}
+
+	printk(KERN_INFO "Target_Core_ConfigFS: Deallocating se_subsystem"
+		"_dev_t: %p\n", se_dev);
+
+hba_out:
+	mutex_unlock(&hba->hba_access_mutex);
+out:
+	kfree(se_dev);
+}
+
+static struct configfs_group_operations target_core_hba_group_ops = {
+	.make_group		= target_core_make_subdev,
+	.drop_item		= target_core_drop_subdev,
+};
+
+CONFIGFS_EATTR_STRUCT(target_core_hba, se_hba);
+#define SE_HBA_ATTR(_name, _mode)				\
+static struct target_core_hba_attribute				\
+		target_core_hba_##_name =			\
+		__CONFIGFS_EATTR(_name, _mode,			\
+		target_core_hba_show_attr_##_name,		\
+		target_core_hba_store_attr_##_name);
+
+#define SE_HBA_ATTR_RO(_name)					\
+static struct target_core_hba_attribute				\
+		target_core_hba_##_name =			\
+		__CONFIGFS_EATTR_RO(_name,			\
+		target_core_hba_show_attr_##_name);
+
+static ssize_t target_core_hba_show_attr_hba_info(
+	struct se_hba *hba,
+	char *page)
+{
+	return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
+			hba->hba_id, hba->transport->name,
+			TARGET_CORE_CONFIGFS_VERSION);
+}
+
+SE_HBA_ATTR_RO(hba_info);
+
+static ssize_t target_core_hba_show_attr_hba_mode(struct se_hba *hba,
+				char *page)
+{
+	int hba_mode = 0;
+
+	if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
+		hba_mode = 1;
+
+	return sprintf(page, "%d\n", hba_mode);
+}
+
+static ssize_t target_core_hba_store_attr_hba_mode(struct se_hba *hba,
+				const char *page, size_t count)
+{
+	struct se_subsystem_api *transport = hba->transport;
+	unsigned long mode_flag;
+	int ret;
+
+	if (transport->pmode_enable_hba == NULL)
+		return -EINVAL;
+
+	ret = strict_strtoul(page, 0, &mode_flag);
+	if (ret < 0) {
+		printk(KERN_ERR "Unable to extract hba mode flag: %d\n", ret);
+		return -EINVAL;
+	}
+
+	spin_lock(&hba->device_lock);
+	if (!(list_empty(&hba->hba_dev_list))) {
+		printk(KERN_ERR "Unable to set hba_mode with active devices\n");
+		spin_unlock(&hba->device_lock);
+		return -EINVAL;
+	}
+	spin_unlock(&hba->device_lock);
+
+	ret = transport->pmode_enable_hba(hba, mode_flag);
+	if (ret < 0)
+		return -EINVAL;
+	if (ret > 0)
+		hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
+	else if (ret == 0)
+		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
+
+	return count;
+}
+
+SE_HBA_ATTR(hba_mode, S_IRUGO | S_IWUSR);
+
+CONFIGFS_EATTR_OPS(target_core_hba, se_hba, hba_group);
+
+static struct configfs_attribute *target_core_hba_attrs[] = {
+	&target_core_hba_hba_info.attr,
+	&target_core_hba_hba_mode.attr,
+	NULL,
+};
+
+static struct configfs_item_operations target_core_hba_item_ops = {
+	.show_attribute		= target_core_hba_attr_show,
+	.store_attribute	= target_core_hba_attr_store,
+};
+
+static struct config_item_type target_core_hba_cit = {
+	.ct_item_ops		= &target_core_hba_item_ops,
+	.ct_group_ops		= &target_core_hba_group_ops,
+	.ct_attrs		= target_core_hba_attrs,
+	.ct_owner		= THIS_MODULE,
+};
+
+static struct config_group *target_core_call_addhbatotarget(
+	struct config_group *group,
+	const char *name)
+{
+	char *se_plugin_str, *str, *str2;
+	struct se_hba *hba;
+	char buf[TARGET_CORE_NAME_MAX_LEN];
+	unsigned long plugin_dep_id = 0;
+	int ret;
+
+	memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
+	if (strlen(name) > TARGET_CORE_NAME_MAX_LEN) {
+		printk(KERN_ERR "Passed *name strlen(): %d exceeds"
+			" TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
+			TARGET_CORE_NAME_MAX_LEN);
+		return ERR_PTR(-ENAMETOOLONG);
+	}
+	snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
+
+	str = strstr(buf, "_");
+	if (!(str)) {
+		printk(KERN_ERR "Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
+		return ERR_PTR(-EINVAL);
+	}
+	se_plugin_str = buf;
+	/*
+	 * Special case for subsystem plugins that have "_" in their names.
+	 * Namely rd_direct and rd_mcp..
+	 */
+	str2 = strstr(str+1, "_");
+	if ((str2)) {
+		*str2 = '\0'; /* Terminate for *se_plugin_str */
+		str2++; /* Skip to start of plugin dependent ID */
+		str = str2;
+	} else {
+		*str = '\0'; /* Terminate for *se_plugin_str */
+		str++; /* Skip to start of plugin dependent ID */
+	}
+
+	ret = strict_strtoul(str, 0, &plugin_dep_id);
+	if (ret < 0) {
+		printk(KERN_ERR "strict_strtoul() returned %d for"
+				" plugin_dep_id\n", ret);
+		return ERR_PTR(-EINVAL);
+	}
+	/*
+	 * Load up TCM subsystem plugins if they have not already been loaded.
+	 */
+	if (transport_subsystem_check_init() < 0)
+		return ERR_PTR(-EINVAL);
+
+	hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
+	if (IS_ERR(hba))
+		return ERR_CAST(hba);
+
+	config_group_init_type_name(&hba->hba_group, name,
+			&target_core_hba_cit);
+
+	return &hba->hba_group;
+}
+
+static void target_core_call_delhbafromtarget(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct se_hba *hba = item_to_hba(item);
+
+	config_item_put(item);
+	core_delete_hba(hba);
+}
+
+static struct configfs_group_operations target_core_group_ops = {
+	.make_group	= target_core_call_addhbatotarget,
+	.drop_item	= target_core_call_delhbafromtarget,
+};
+
+static struct config_item_type target_core_cit = {
+	.ct_item_ops	= NULL,
+	.ct_group_ops	= &target_core_group_ops,
+	.ct_attrs	= NULL,
+	.ct_owner	= THIS_MODULE,
+};
+
+/* Stop functions for struct config_item_type target_core_hba_cit */
+
+static int target_core_init_configfs(void)
+{
+	struct config_group *target_cg, *hba_cg = NULL, *alua_cg = NULL;
+	struct config_group *lu_gp_cg = NULL;
+	struct configfs_subsystem *subsys;
+	struct proc_dir_entry *scsi_target_proc = NULL;
+	struct t10_alua_lu_gp *lu_gp;
+	int ret;
+
+	printk(KERN_INFO "TARGET_CORE[0]: Loading Generic Kernel Storage"
+		" Engine: %s on %s/%s on "UTS_RELEASE"\n",
+		TARGET_CORE_VERSION, utsname()->sysname, utsname()->machine);
+
+	subsys = target_core_subsystem[0];
+	config_group_init(&subsys->su_group);
+	mutex_init(&subsys->su_mutex);
+
+	INIT_LIST_HEAD(&g_tf_list);
+	mutex_init(&g_tf_lock);
+	init_scsi_index_table();
+	ret = init_se_global();
+	if (ret < 0)
+		return -1;
+	/*
+	 * Create $CONFIGFS/target/core default group for HBA <-> Storage Object
+	 * and ALUA Logical Unit Group and Target Port Group infrastructure.
+	 */
+	target_cg = &subsys->su_group;
+	target_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
+				GFP_KERNEL);
+	if (!(target_cg->default_groups)) {
+		printk(KERN_ERR "Unable to allocate target_cg->default_groups\n");
+		goto out_global;
+	}
+
+	config_group_init_type_name(&se_global->target_core_hbagroup,
+			"core", &target_core_cit);
+	target_cg->default_groups[0] = &se_global->target_core_hbagroup;
+	target_cg->default_groups[1] = NULL;
+	/*
+	 * Create ALUA infrastructure under /sys/kernel/config/target/core/alua/
+	 */
+	hba_cg = &se_global->target_core_hbagroup;
+	hba_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
+				GFP_KERNEL);
+	if (!(hba_cg->default_groups)) {
+		printk(KERN_ERR "Unable to allocate hba_cg->default_groups\n");
+		goto out_global;
+	}
+	config_group_init_type_name(&se_global->alua_group,
+			"alua", &target_core_alua_cit);
+	hba_cg->default_groups[0] = &se_global->alua_group;
+	hba_cg->default_groups[1] = NULL;
+	/*
+	 * Add ALUA Logical Unit Group and Target Port Group ConfigFS
+	 * groups under /sys/kernel/config/target/core/alua/
+	 */
+	alua_cg = &se_global->alua_group;
+	alua_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
+			GFP_KERNEL);
+	if (!(alua_cg->default_groups)) {
+		printk(KERN_ERR "Unable to allocate alua_cg->default_groups\n");
+		goto out_global;
+	}
+
+	config_group_init_type_name(&se_global->alua_lu_gps_group,
+			"lu_gps", &target_core_alua_lu_gps_cit);
+	alua_cg->default_groups[0] = &se_global->alua_lu_gps_group;
+	alua_cg->default_groups[1] = NULL;
+	/*
+	 * Add core/alua/lu_gps/default_lu_gp
+	 */
+	lu_gp = core_alua_allocate_lu_gp("default_lu_gp", 1);
+	if (IS_ERR(lu_gp))
+		goto out_global;
+
+	lu_gp_cg = &se_global->alua_lu_gps_group;
+	lu_gp_cg->default_groups = kzalloc(sizeof(struct config_group) * 2,
+			GFP_KERNEL);
+	if (!(lu_gp_cg->default_groups)) {
+		printk(KERN_ERR "Unable to allocate lu_gp_cg->default_groups\n");
+		goto out_global;
+	}
+
+	config_group_init_type_name(&lu_gp->lu_gp_group, "default_lu_gp",
+				&target_core_alua_lu_gp_cit);
+	lu_gp_cg->default_groups[0] = &lu_gp->lu_gp_group;
+	lu_gp_cg->default_groups[1] = NULL;
+	se_global->default_lu_gp = lu_gp;
+	/*
+	 * Register the target_core_mod subsystem with configfs.
+	 */
+	ret = configfs_register_subsystem(subsys);
+	if (ret < 0) {
+		printk(KERN_ERR "Error %d while registering subsystem %s\n",
+			ret, subsys->su_group.cg_item.ci_namebuf);
+		goto out_global;
+	}
+	printk(KERN_INFO "TARGET_CORE[0]: Initialized ConfigFS Fabric"
+		" Infrastructure: "TARGET_CORE_CONFIGFS_VERSION" on %s/%s"
+		" on "UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
+	/*
+	 * Register built-in RAMDISK subsystem logic for virtual LUN 0
+	 */
+	ret = rd_module_init();
+	if (ret < 0)
+		goto out;
+
+	if (core_dev_setup_virtual_lun0() < 0)
+		goto out;
+
+	scsi_target_proc = proc_mkdir("scsi_target", 0);
+	if (!(scsi_target_proc)) {
+		printk(KERN_ERR "proc_mkdir(scsi_target, 0) failed\n");
+		goto out;
+	}
+	ret = init_scsi_target_mib();
+	if (ret < 0)
+		goto out;
+
+	return 0;
+
+out:
+	configfs_unregister_subsystem(subsys);
+	if (scsi_target_proc)
+		remove_proc_entry("scsi_target", 0);
+	core_dev_release_virtual_lun0();
+	rd_module_exit();
+out_global:
+	if (se_global->default_lu_gp) {
+		core_alua_free_lu_gp(se_global->default_lu_gp);
+		se_global->default_lu_gp = NULL;
+	}
+	if (lu_gp_cg)
+		kfree(lu_gp_cg->default_groups);
+	if (alua_cg)
+		kfree(alua_cg->default_groups);
+	if (hba_cg)
+		kfree(hba_cg->default_groups);
+	kfree(target_cg->default_groups);
+	release_se_global();
+	return -1;
+}
+
+static void target_core_exit_configfs(void)
+{
+	struct configfs_subsystem *subsys;
+	struct config_group *hba_cg, *alua_cg, *lu_gp_cg;
+	struct config_item *item;
+	int i;
+
+	se_global->in_shutdown = 1;
+	subsys = target_core_subsystem[0];
+
+	lu_gp_cg = &se_global->alua_lu_gps_group;
+	for (i = 0; lu_gp_cg->default_groups[i]; i++) {
+		item = &lu_gp_cg->default_groups[i]->cg_item;
+		lu_gp_cg->default_groups[i] = NULL;
+		config_item_put(item);
+	}
+	kfree(lu_gp_cg->default_groups);
+	core_alua_free_lu_gp(se_global->default_lu_gp);
+	se_global->default_lu_gp = NULL;
+
+	alua_cg = &se_global->alua_group;
+	for (i = 0; alua_cg->default_groups[i]; i++) {
+		item = &alua_cg->default_groups[i]->cg_item;
+		alua_cg->default_groups[i] = NULL;
+		config_item_put(item);
+	}
+	kfree(alua_cg->default_groups);
+
+	hba_cg = &se_global->target_core_hbagroup;
+	for (i = 0; hba_cg->default_groups[i]; i++) {
+		item = &hba_cg->default_groups[i]->cg_item;
+		hba_cg->default_groups[i] = NULL;
+		config_item_put(item);
+	}
+	kfree(hba_cg->default_groups);
+
+	for (i = 0; subsys->su_group.default_groups[i]; i++) {
+		item = &subsys->su_group.default_groups[i]->cg_item;
+		subsys->su_group.default_groups[i] = NULL;
+		config_item_put(item);
+	}
+	kfree(subsys->su_group.default_groups);
+
+	configfs_unregister_subsystem(subsys);
+	printk(KERN_INFO "TARGET_CORE[0]: Released ConfigFS Fabric"
+			" Infrastructure\n");
+
+	remove_scsi_target_mib();
+	remove_proc_entry("scsi_target", 0);
+	core_dev_release_virtual_lun0();
+	rd_module_exit();
+	release_se_global();
+
+	return;
+}
+
+MODULE_DESCRIPTION("Target_Core_Mod/ConfigFS");
+MODULE_AUTHOR("nab@Linux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(target_core_init_configfs);
+module_exit(target_core_exit_configfs);
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
new file mode 100644
index 0000000..317ce58
--- /dev/null
+++ b/drivers/target/target_core_device.c
@@ -0,0 +1,1694 @@
+/*******************************************************************************
+ * Filename:  target_core_device.c (based on iscsi_target_device.c)
+ *
+ * This file contains the iSCSI Virtual Device and Disk Transport
+ * agnostic related functions.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/kthread.h>
+#include <linux/in.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <scsi/scsi.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+
+#include "target_core_alua.h"
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+#include "target_core_ua.h"
+
+static void se_dev_start(struct se_device *dev);
+static void se_dev_stop(struct se_device *dev);
+
+int transport_get_lun_for_cmd(
+	struct se_cmd *se_cmd,
+	unsigned char *cdb,
+	u32 unpacked_lun)
+{
+	struct se_dev_entry *deve;
+	struct se_lun *se_lun = NULL;
+	struct se_session *se_sess = SE_SESS(se_cmd);
+	unsigned long flags;
+	int read_only = 0;
+
+	spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
+	deve = se_cmd->se_deve =
+			&SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
+	if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
+		if (se_cmd) {
+			deve->total_cmds++;
+			deve->total_bytes += se_cmd->data_length;
+
+			if (se_cmd->data_direction == DMA_TO_DEVICE) {
+				if (deve->lun_flags &
+						TRANSPORT_LUNFLAGS_READ_ONLY) {
+					read_only = 1;
+					goto out;
+				}
+				deve->write_bytes += se_cmd->data_length;
+			} else if (se_cmd->data_direction ==
+				   DMA_FROM_DEVICE) {
+				deve->read_bytes += se_cmd->data_length;
+			}
+		}
+		deve->deve_cmds++;
+
+		se_lun = se_cmd->se_lun = deve->se_lun;
+		se_cmd->pr_res_key = deve->pr_res_key;
+		se_cmd->orig_fe_lun = unpacked_lun;
+		se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
+		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+	}
+out:
+	spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
+
+	if (!se_lun) {
+		if (read_only) {
+			se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
+			se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+			printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
+				" Access for 0x%08x\n",
+				CMD_TFO(se_cmd)->get_fabric_name(),
+				unpacked_lun);
+			return -1;
+		} else {
+			/*
+			 * Use the se_portal_group->tpg_virt_lun0 to allow for
+			 * REPORT_LUNS, et al to be returned when no active
+			 * MappedLUN=0 exists for this Initiator Port.
+			 */
+			if (unpacked_lun != 0) {
+				se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
+				se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+				printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
+					" Access for 0x%08x\n",
+					CMD_TFO(se_cmd)->get_fabric_name(),
+					unpacked_lun);
+				return -1;
+			}
+			/*
+			 * Force WRITE PROTECT for virtual LUN 0
+			 */
+			if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
+			    (se_cmd->data_direction != DMA_NONE)) {
+				se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
+				se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+				return -1;
+			}
+#if 0
+			printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
+				CMD_TFO(se_cmd)->get_fabric_name());
+#endif
+			se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
+			se_cmd->orig_fe_lun = 0;
+			se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
+			se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
+		}
+	}
+	/*
+	 * Determine if the struct se_lun is online.
+	 */
+/* #warning FIXME: Check for LUN_RESET + UNIT Attention */
+	if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
+		se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
+		se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+		return -1;
+	}
+
+	{
+	struct se_device *dev = se_lun->lun_se_dev;
+	spin_lock(&dev->stats_lock);
+	dev->num_cmds++;
+	if (se_cmd->data_direction == DMA_TO_DEVICE)
+		dev->write_bytes += se_cmd->data_length;
+	else if (se_cmd->data_direction == DMA_FROM_DEVICE)
+		dev->read_bytes += se_cmd->data_length;
+	spin_unlock(&dev->stats_lock);
+	}
+
+	/*
+	 * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
+	 * for tracking state of struct se_cmds during LUN shutdown events.
+	 */
+	spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
+	list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
+	atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
+#if 0
+	printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
+		CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
+#endif
+	spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(transport_get_lun_for_cmd);
+
+int transport_get_lun_for_tmr(
+	struct se_cmd *se_cmd,
+	u32 unpacked_lun)
+{
+	struct se_device *dev = NULL;
+	struct se_dev_entry *deve;
+	struct se_lun *se_lun = NULL;
+	struct se_session *se_sess = SE_SESS(se_cmd);
+	struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
+
+	spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
+	deve = se_cmd->se_deve =
+			&SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
+	if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
+		se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
+		dev = se_tmr->tmr_dev = se_lun->lun_se_dev;
+		se_cmd->pr_res_key = deve->pr_res_key;
+		se_cmd->orig_fe_lun = unpacked_lun;
+		se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
+/*		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
+	}
+	spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
+
+	if (!se_lun) {
+		printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
+			" Access for 0x%08x\n",
+			CMD_TFO(se_cmd)->get_fabric_name(),
+			unpacked_lun);
+		se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+		return -1;
+	}
+	/*
+	 * Determine if the struct se_lun is online.
+	 */
+/* #warning FIXME: Check for LUN_RESET + UNIT Attention */
+	if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
+		se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+		return -1;
+	}
+
+	spin_lock(&dev->se_tmr_lock);
+	list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
+	spin_unlock(&dev->se_tmr_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(transport_get_lun_for_tmr);
+
+/*
+ * This function is called from core_scsi3_emulate_pro_register_and_move()
+ * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
+ * when a matching rtpi is found.
+ */
+struct se_dev_entry *core_get_se_deve_from_rtpi(
+	struct se_node_acl *nacl,
+	u16 rtpi)
+{
+	struct se_dev_entry *deve;
+	struct se_lun *lun;
+	struct se_port *port;
+	struct se_portal_group *tpg = nacl->se_tpg;
+	u32 i;
+
+	spin_lock_irq(&nacl->device_list_lock);
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		deve = &nacl->device_list[i];
+
+		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
+			continue;
+
+		lun = deve->se_lun;
+		if (!(lun)) {
+			printk(KERN_ERR "%s device entries device pointer is"
+				" NULL, but Initiator has access.\n",
+				TPG_TFO(tpg)->get_fabric_name());
+			continue;
+		}
+		port = lun->lun_sep;
+		if (!(port)) {
+			printk(KERN_ERR "%s device entries device pointer is"
+				" NULL, but Initiator has access.\n",
+				TPG_TFO(tpg)->get_fabric_name());
+			continue;
+		}
+		if (port->sep_rtpi != rtpi)
+			continue;
+
+		atomic_inc(&deve->pr_ref_count);
+		smp_mb__after_atomic_inc();
+		spin_unlock_irq(&nacl->device_list_lock);
+
+		return deve;
+	}
+	spin_unlock_irq(&nacl->device_list_lock);
+
+	return NULL;
+}
+
+int core_free_device_list_for_node(
+	struct se_node_acl *nacl,
+	struct se_portal_group *tpg)
+{
+	struct se_dev_entry *deve;
+	struct se_lun *lun;
+	u32 i;
+
+	if (!nacl->device_list)
+		return 0;
+
+	spin_lock_irq(&nacl->device_list_lock);
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		deve = &nacl->device_list[i];
+
+		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
+			continue;
+
+		if (!deve->se_lun) {
+			printk(KERN_ERR "%s device entries device pointer is"
+				" NULL, but Initiator has access.\n",
+				TPG_TFO(tpg)->get_fabric_name());
+			continue;
+		}
+		lun = deve->se_lun;
+
+		spin_unlock_irq(&nacl->device_list_lock);
+		core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
+			TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
+		spin_lock_irq(&nacl->device_list_lock);
+	}
+	spin_unlock_irq(&nacl->device_list_lock);
+
+	kfree(nacl->device_list);
+	nacl->device_list = NULL;
+
+	return 0;
+}
+
+void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
+{
+	struct se_dev_entry *deve;
+
+	spin_lock_irq(&se_nacl->device_list_lock);
+	deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
+	deve->deve_cmds--;
+	spin_unlock_irq(&se_nacl->device_list_lock);
+
+	return;
+}
+
+void core_update_device_list_access(
+	u32 mapped_lun,
+	u32 lun_access,
+	struct se_node_acl *nacl)
+{
+	struct se_dev_entry *deve;
+
+	spin_lock_irq(&nacl->device_list_lock);
+	deve = &nacl->device_list[mapped_lun];
+	if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
+		deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
+		deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
+	} else {
+		deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
+		deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
+	}
+	spin_unlock_irq(&nacl->device_list_lock);
+
+	return;
+}
+
+/*      core_update_device_list_for_node():
+ *
+ *
+ */
+int core_update_device_list_for_node(
+	struct se_lun *lun,
+	struct se_lun_acl *lun_acl,
+	u32 mapped_lun,
+	u32 lun_access,
+	struct se_node_acl *nacl,
+	struct se_portal_group *tpg,
+	int enable)
+{
+	struct se_port *port = lun->lun_sep;
+	struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
+	int trans = 0;
+	/*
+	 * If the MappedLUN entry is being disabled, the entry in
+	 * port->sep_alua_list must be removed now before clearing the
+	 * struct se_dev_entry pointers below as logic in
+	 * core_alua_do_transition_tg_pt() depends on these being present.
+	 */
+	if (!(enable)) {
+		/*
+		 * deve->se_lun_acl will be NULL for demo-mode created LUNs
+		 * that have not been explictly concerted to MappedLUNs ->
+		 * struct se_lun_acl.
+		 */
+		if (!(deve->se_lun_acl))
+			return 0;
+
+		spin_lock_bh(&port->sep_alua_lock);
+		list_del(&deve->alua_port_list);
+		spin_unlock_bh(&port->sep_alua_lock);
+	}
+
+	spin_lock_irq(&nacl->device_list_lock);
+	if (enable) {
+		/*
+		 * Check if the call is handling demo mode -> explict LUN ACL
+		 * transition.  This transition must be for the same struct se_lun
+		 * + mapped_lun that was setup in demo mode..
+		 */
+		if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
+			if (deve->se_lun_acl != NULL) {
+				printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
+					" already set for demo mode -> explict"
+					" LUN ACL transition\n");
+				return -1;
+			}
+			if (deve->se_lun != lun) {
+				printk(KERN_ERR "struct se_dev_entry->se_lun does"
+					" match passed struct se_lun for demo mode"
+					" -> explict LUN ACL transition\n");
+				return -1;
+			}
+			deve->se_lun_acl = lun_acl;
+			trans = 1;
+		} else {
+			deve->se_lun = lun;
+			deve->se_lun_acl = lun_acl;
+			deve->mapped_lun = mapped_lun;
+			deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
+		}
+
+		if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
+			deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
+			deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
+		} else {
+			deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
+			deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
+		}
+
+		if (trans) {
+			spin_unlock_irq(&nacl->device_list_lock);
+			return 0;
+		}
+		deve->creation_time = get_jiffies_64();
+		deve->attach_count++;
+		spin_unlock_irq(&nacl->device_list_lock);
+
+		spin_lock_bh(&port->sep_alua_lock);
+		list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
+		spin_unlock_bh(&port->sep_alua_lock);
+
+		return 0;
+	}
+	/*
+	 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
+	 * PR operation to complete.
+	 */
+	spin_unlock_irq(&nacl->device_list_lock);
+	while (atomic_read(&deve->pr_ref_count) != 0)
+		cpu_relax();
+	spin_lock_irq(&nacl->device_list_lock);
+	/*
+	 * Disable struct se_dev_entry LUN ACL mapping
+	 */
+	core_scsi3_ua_release_all(deve);
+	deve->se_lun = NULL;
+	deve->se_lun_acl = NULL;
+	deve->lun_flags = 0;
+	deve->creation_time = 0;
+	deve->attach_count--;
+	spin_unlock_irq(&nacl->device_list_lock);
+
+	core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
+	return 0;
+}
+
+/*      core_clear_lun_from_tpg():
+ *
+ *
+ */
+void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
+{
+	struct se_node_acl *nacl;
+	struct se_dev_entry *deve;
+	u32 i;
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
+		spin_unlock_bh(&tpg->acl_node_lock);
+
+		spin_lock_irq(&nacl->device_list_lock);
+		for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+			deve = &nacl->device_list[i];
+			if (lun != deve->se_lun)
+				continue;
+			spin_unlock_irq(&nacl->device_list_lock);
+
+			core_update_device_list_for_node(lun, NULL,
+				deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
+				nacl, tpg, 0);
+
+			spin_lock_irq(&nacl->device_list_lock);
+		}
+		spin_unlock_irq(&nacl->device_list_lock);
+
+		spin_lock_bh(&tpg->acl_node_lock);
+	}
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	return;
+}
+
+static struct se_port *core_alloc_port(struct se_device *dev)
+{
+	struct se_port *port, *port_tmp;
+
+	port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
+	if (!(port)) {
+		printk(KERN_ERR "Unable to allocate struct se_port\n");
+		return NULL;
+	}
+	INIT_LIST_HEAD(&port->sep_alua_list);
+	INIT_LIST_HEAD(&port->sep_list);
+	atomic_set(&port->sep_tg_pt_secondary_offline, 0);
+	spin_lock_init(&port->sep_alua_lock);
+	mutex_init(&port->sep_tg_pt_md_mutex);
+
+	spin_lock(&dev->se_port_lock);
+	if (dev->dev_port_count == 0x0000ffff) {
+		printk(KERN_WARNING "Reached dev->dev_port_count =="
+				" 0x0000ffff\n");
+		spin_unlock(&dev->se_port_lock);
+		return NULL;
+	}
+again:
+	/*
+	 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
+	 * Here is the table from spc4r17 section 7.7.3.8.
+	 *
+	 *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
+	 *
+	 * Code      Description
+	 * 0h        Reserved
+	 * 1h        Relative port 1, historically known as port A
+	 * 2h        Relative port 2, historically known as port B
+	 * 3h to FFFFh    Relative port 3 through 65 535
+	 */
+	port->sep_rtpi = dev->dev_rpti_counter++;
+	if (!(port->sep_rtpi))
+		goto again;
+
+	list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
+		/*
+		 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
+		 * for 16-bit wrap..
+		 */
+		if (port->sep_rtpi == port_tmp->sep_rtpi)
+			goto again;
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	return port;
+}
+
+static void core_export_port(
+	struct se_device *dev,
+	struct se_portal_group *tpg,
+	struct se_port *port,
+	struct se_lun *lun)
+{
+	struct se_subsystem_dev *su_dev = SU_DEV(dev);
+	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
+
+	spin_lock(&dev->se_port_lock);
+	spin_lock(&lun->lun_sep_lock);
+	port->sep_tpg = tpg;
+	port->sep_lun = lun;
+	lun->lun_sep = port;
+	spin_unlock(&lun->lun_sep_lock);
+
+	list_add_tail(&port->sep_list, &dev->dev_sep_list);
+	spin_unlock(&dev->se_port_lock);
+
+	if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
+		tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
+		if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
+			printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
+					"_gp_member_t\n");
+			return;
+		}
+		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+		__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
+			T10_ALUA(su_dev)->default_tg_pt_gp);
+		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
+		printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
+			" Group: alua/default_tg_pt_gp\n",
+			TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
+	}
+
+	dev->dev_port_count++;
+	port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
+}
+
+/*
+ *	Called with struct se_device->se_port_lock spinlock held.
+ */
+static void core_release_port(struct se_device *dev, struct se_port *port)
+{
+	/*
+	 * Wait for any port reference for PR ALL_TG_PT=1 operation
+	 * to complete in __core_scsi3_alloc_registration()
+	 */
+	spin_unlock(&dev->se_port_lock);
+	if (atomic_read(&port->sep_tg_pt_ref_cnt))
+		cpu_relax();
+	spin_lock(&dev->se_port_lock);
+
+	core_alua_free_tg_pt_gp_mem(port);
+
+	list_del(&port->sep_list);
+	dev->dev_port_count--;
+	kfree(port);
+
+	return;
+}
+
+int core_dev_export(
+	struct se_device *dev,
+	struct se_portal_group *tpg,
+	struct se_lun *lun)
+{
+	struct se_port *port;
+
+	port = core_alloc_port(dev);
+	if (!(port))
+		return -1;
+
+	lun->lun_se_dev = dev;
+	se_dev_start(dev);
+
+	atomic_inc(&dev->dev_export_obj.obj_access_count);
+	core_export_port(dev, tpg, port, lun);
+	return 0;
+}
+
+void core_dev_unexport(
+	struct se_device *dev,
+	struct se_portal_group *tpg,
+	struct se_lun *lun)
+{
+	struct se_port *port = lun->lun_sep;
+
+	spin_lock(&lun->lun_sep_lock);
+	if (lun->lun_se_dev == NULL) {
+		spin_unlock(&lun->lun_sep_lock);
+		return;
+	}
+	spin_unlock(&lun->lun_sep_lock);
+
+	spin_lock(&dev->se_port_lock);
+	atomic_dec(&dev->dev_export_obj.obj_access_count);
+	core_release_port(dev, port);
+	spin_unlock(&dev->se_port_lock);
+
+	se_dev_stop(dev);
+	lun->lun_se_dev = NULL;
+}
+
+int transport_core_report_lun_response(struct se_cmd *se_cmd)
+{
+	struct se_dev_entry *deve;
+	struct se_lun *se_lun;
+	struct se_session *se_sess = SE_SESS(se_cmd);
+	struct se_task *se_task;
+	unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
+	u32 cdb_offset = 0, lun_count = 0, offset = 8;
+	u64 i, lun;
+
+	list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
+		break;
+
+	if (!(se_task)) {
+		printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+
+	/*
+	 * If no struct se_session pointer is present, this struct se_cmd is
+	 * coming via a target_core_mod PASSTHROUGH op, and not through
+	 * a $FABRIC_MOD.  In that case, report LUN=0 only.
+	 */
+	if (!(se_sess)) {
+		lun = 0;
+		buf[offset++] = ((lun >> 56) & 0xff);
+		buf[offset++] = ((lun >> 48) & 0xff);
+		buf[offset++] = ((lun >> 40) & 0xff);
+		buf[offset++] = ((lun >> 32) & 0xff);
+		buf[offset++] = ((lun >> 24) & 0xff);
+		buf[offset++] = ((lun >> 16) & 0xff);
+		buf[offset++] = ((lun >> 8) & 0xff);
+		buf[offset++] = (lun & 0xff);
+		lun_count = 1;
+		goto done;
+	}
+
+	spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		deve = &SE_NODE_ACL(se_sess)->device_list[i];
+		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
+			continue;
+		se_lun = deve->se_lun;
+		/*
+		 * We determine the correct LUN LIST LENGTH even once we
+		 * have reached the initial allocation length.
+		 * See SPC2-R20 7.19.
+		 */
+		lun_count++;
+		if ((cdb_offset + 8) >= se_cmd->data_length)
+			continue;
+
+		lun = cpu_to_be64(CMD_TFO(se_cmd)->pack_lun(deve->mapped_lun));
+		buf[offset++] = ((lun >> 56) & 0xff);
+		buf[offset++] = ((lun >> 48) & 0xff);
+		buf[offset++] = ((lun >> 40) & 0xff);
+		buf[offset++] = ((lun >> 32) & 0xff);
+		buf[offset++] = ((lun >> 24) & 0xff);
+		buf[offset++] = ((lun >> 16) & 0xff);
+		buf[offset++] = ((lun >> 8) & 0xff);
+		buf[offset++] = (lun & 0xff);
+		cdb_offset += 8;
+	}
+	spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
+
+	/*
+	 * See SPC3 r07, page 159.
+	 */
+done:
+	lun_count *= 8;
+	buf[0] = ((lun_count >> 24) & 0xff);
+	buf[1] = ((lun_count >> 16) & 0xff);
+	buf[2] = ((lun_count >> 8) & 0xff);
+	buf[3] = (lun_count & 0xff);
+
+	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+/*	se_release_device_for_hba():
+ *
+ *
+ */
+void se_release_device_for_hba(struct se_device *dev)
+{
+	struct se_hba *hba = dev->se_hba;
+
+	if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
+	    (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
+	    (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
+	    (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
+	    (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
+		se_dev_stop(dev);
+
+	if (dev->dev_ptr) {
+		kthread_stop(dev->process_thread);
+		if (dev->transport->free_device)
+			dev->transport->free_device(dev->dev_ptr);
+	}
+
+	spin_lock(&hba->device_lock);
+	list_del(&dev->dev_list);
+	hba->dev_count--;
+	spin_unlock(&hba->device_lock);
+
+	core_scsi3_free_all_registrations(dev);
+	se_release_vpd_for_dev(dev);
+
+	kfree(dev->dev_status_queue_obj);
+	kfree(dev->dev_queue_obj);
+	kfree(dev);
+
+	return;
+}
+
+void se_release_vpd_for_dev(struct se_device *dev)
+{
+	struct t10_vpd *vpd, *vpd_tmp;
+
+	spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
+	list_for_each_entry_safe(vpd, vpd_tmp,
+			&DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
+		list_del(&vpd->vpd_list);
+		kfree(vpd);
+	}
+	spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
+
+	return;
+}
+
+/*
+ * Called with struct se_hba->device_lock held.
+ */
+void se_clear_dev_ports(struct se_device *dev)
+{
+	struct se_hba *hba = dev->se_hba;
+	struct se_lun *lun;
+	struct se_portal_group *tpg;
+	struct se_port *sep, *sep_tmp;
+
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry_safe(sep, sep_tmp, &dev->dev_sep_list, sep_list) {
+		spin_unlock(&dev->se_port_lock);
+		spin_unlock(&hba->device_lock);
+
+		lun = sep->sep_lun;
+		tpg = sep->sep_tpg;
+		spin_lock(&lun->lun_sep_lock);
+		if (lun->lun_se_dev == NULL) {
+			spin_unlock(&lun->lun_sep_lock);
+			continue;
+		}
+		spin_unlock(&lun->lun_sep_lock);
+
+		core_dev_del_lun(tpg, lun->unpacked_lun);
+
+		spin_lock(&hba->device_lock);
+		spin_lock(&dev->se_port_lock);
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	return;
+}
+
+/*	se_free_virtual_device():
+ *
+ *	Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
+ */
+int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
+{
+	spin_lock(&hba->device_lock);
+	se_clear_dev_ports(dev);
+	spin_unlock(&hba->device_lock);
+
+	core_alua_free_lu_gp_mem(dev);
+	se_release_device_for_hba(dev);
+
+	return 0;
+}
+
+static void se_dev_start(struct se_device *dev)
+{
+	struct se_hba *hba = dev->se_hba;
+
+	spin_lock(&hba->device_lock);
+	atomic_inc(&dev->dev_obj.obj_access_count);
+	if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
+		if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
+			dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
+			dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
+		} else if (dev->dev_status &
+			   TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
+			dev->dev_status &=
+				~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
+			dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
+		}
+	}
+	spin_unlock(&hba->device_lock);
+}
+
+static void se_dev_stop(struct se_device *dev)
+{
+	struct se_hba *hba = dev->se_hba;
+
+	spin_lock(&hba->device_lock);
+	atomic_dec(&dev->dev_obj.obj_access_count);
+	if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
+		if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
+			dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
+			dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
+		} else if (dev->dev_status &
+			   TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
+			dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
+			dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
+		}
+	}
+	spin_unlock(&hba->device_lock);
+
+	while (atomic_read(&hba->dev_mib_access_count))
+		cpu_relax();
+}
+
+int se_dev_check_online(struct se_device *dev)
+{
+	int ret;
+
+	spin_lock_irq(&dev->dev_status_lock);
+	ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
+	       (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
+	spin_unlock_irq(&dev->dev_status_lock);
+
+	return ret;
+}
+
+int se_dev_check_shutdown(struct se_device *dev)
+{
+	int ret;
+
+	spin_lock_irq(&dev->dev_status_lock);
+	ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
+	spin_unlock_irq(&dev->dev_status_lock);
+
+	return ret;
+}
+
+void se_dev_set_default_attribs(
+	struct se_device *dev,
+	struct se_dev_limits *dev_limits)
+{
+	struct queue_limits *limits = &dev_limits->limits;
+
+	DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
+	DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
+	DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
+	DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
+	DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
+	DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
+	DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
+	DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
+	DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
+	DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
+	DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
+	/*
+	 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
+	 * iblock_create_virtdevice() from struct queue_limits values
+	 * if blk_queue_discard()==1
+	 */
+	DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
+	DEV_ATTRIB(dev)->max_unmap_block_desc_count =
+				DA_MAX_UNMAP_BLOCK_DESC_COUNT;
+	DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
+	DEV_ATTRIB(dev)->unmap_granularity_alignment =
+				DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
+	/*
+	 * block_size is based on subsystem plugin dependent requirements.
+	 */
+	DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
+	DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
+	/*
+	 * max_sectors is based on subsystem plugin dependent requirements.
+	 */
+	DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
+	DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
+	/*
+	 * Set optimal_sectors from max_sectors, which can be lowered via
+	 * configfs.
+	 */
+	DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
+	/*
+	 * queue_depth is based on subsystem plugin dependent requirements.
+	 */
+	DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
+	DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
+}
+
+int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
+{
+	if (task_timeout > DA_TASK_TIMEOUT_MAX) {
+		printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
+			" DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
+		return -1;
+	} else {
+		DEV_ATTRIB(dev)->task_timeout = task_timeout;
+		printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
+			dev, task_timeout);
+	}
+
+	return 0;
+}
+
+int se_dev_set_max_unmap_lba_count(
+	struct se_device *dev,
+	u32 max_unmap_lba_count)
+{
+	DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
+	printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
+			dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
+	return 0;
+}
+
+int se_dev_set_max_unmap_block_desc_count(
+	struct se_device *dev,
+	u32 max_unmap_block_desc_count)
+{
+	DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
+	printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
+			dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
+	return 0;
+}
+
+int se_dev_set_unmap_granularity(
+	struct se_device *dev,
+	u32 unmap_granularity)
+{
+	DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
+	printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
+			dev, DEV_ATTRIB(dev)->unmap_granularity);
+	return 0;
+}
+
+int se_dev_set_unmap_granularity_alignment(
+	struct se_device *dev,
+	u32 unmap_granularity_alignment)
+{
+	DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
+	printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
+			dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
+	return 0;
+}
+
+int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+	if (TRANSPORT(dev)->dpo_emulated == NULL) {
+		printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
+		return -1;
+	}
+	if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
+		printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
+		return -1;
+	}
+	DEV_ATTRIB(dev)->emulate_dpo = flag;
+	printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
+			" bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
+	return 0;
+}
+
+int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+	if (TRANSPORT(dev)->fua_write_emulated == NULL) {
+		printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
+		return -1;
+	}
+	if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
+		printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
+		return -1;
+	}
+	DEV_ATTRIB(dev)->emulate_fua_write = flag;
+	printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
+			dev, DEV_ATTRIB(dev)->emulate_fua_write);
+	return 0;
+}
+
+int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+	if (TRANSPORT(dev)->fua_read_emulated == NULL) {
+		printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
+		return -1;
+	}
+	if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
+		printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
+		return -1;
+	}
+	DEV_ATTRIB(dev)->emulate_fua_read = flag;
+	printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
+			dev, DEV_ATTRIB(dev)->emulate_fua_read);
+	return 0;
+}
+
+int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+	if (TRANSPORT(dev)->write_cache_emulated == NULL) {
+		printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
+		return -1;
+	}
+	if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
+		printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
+		return -1;
+	}
+	DEV_ATTRIB(dev)->emulate_write_cache = flag;
+	printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
+			dev, DEV_ATTRIB(dev)->emulate_write_cache);
+	return 0;
+}
+
+int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1) && (flag != 2)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+
+	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+		printk(KERN_ERR "dev[%p]: Unable to change SE Device"
+			" UA_INTRLCK_CTRL while dev_export_obj: %d count"
+			" exists\n", dev,
+			atomic_read(&dev->dev_export_obj.obj_access_count));
+		return -1;
+	}
+	DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
+	printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
+		dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
+
+	return 0;
+}
+
+int se_dev_set_emulate_tas(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+
+	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+		printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
+			" dev_export_obj: %d count exists\n", dev,
+			atomic_read(&dev->dev_export_obj.obj_access_count));
+		return -1;
+	}
+	DEV_ATTRIB(dev)->emulate_tas = flag;
+	printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
+		dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
+
+	return 0;
+}
+
+int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+	/*
+	 * We expect this value to be non-zero when generic Block Layer
+	 * Discard supported is detected iblock_create_virtdevice().
+	 */
+	if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
+		printk(KERN_ERR "Generic Block Discard not supported\n");
+		return -ENOSYS;
+	}
+
+	DEV_ATTRIB(dev)->emulate_tpu = flag;
+	printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
+				dev, flag);
+	return 0;
+}
+
+int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+	/*
+	 * We expect this value to be non-zero when generic Block Layer
+	 * Discard supported is detected iblock_create_virtdevice().
+	 */
+	if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
+		printk(KERN_ERR "Generic Block Discard not supported\n");
+		return -ENOSYS;
+	}
+
+	DEV_ATTRIB(dev)->emulate_tpws = flag;
+	printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
+				dev, flag);
+	return 0;
+}
+
+int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
+{
+	if ((flag != 0) && (flag != 1)) {
+		printk(KERN_ERR "Illegal value %d\n", flag);
+		return -1;
+	}
+	DEV_ATTRIB(dev)->enforce_pr_isids = flag;
+	printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
+		(DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
+	return 0;
+}
+
+/*
+ * Note, this can only be called on unexported SE Device Object.
+ */
+int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
+{
+	u32 orig_queue_depth = dev->queue_depth;
+
+	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+		printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
+			" dev_export_obj: %d count exists\n", dev,
+			atomic_read(&dev->dev_export_obj.obj_access_count));
+		return -1;
+	}
+	if (!(queue_depth)) {
+		printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
+			"_depth\n", dev);
+		return -1;
+	}
+
+	if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
+		if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
+			printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
+				" exceeds TCM/SE_Device TCQ: %u\n",
+				dev, queue_depth,
+				DEV_ATTRIB(dev)->hw_queue_depth);
+			return -1;
+		}
+	} else {
+		if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
+			if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
+				printk(KERN_ERR "dev[%p]: Passed queue_depth:"
+					" %u exceeds TCM/SE_Device MAX"
+					" TCQ: %u\n", dev, queue_depth,
+					DEV_ATTRIB(dev)->hw_queue_depth);
+				return -1;
+			}
+		}
+	}
+
+	DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
+	if (queue_depth > orig_queue_depth)
+		atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
+	else if (queue_depth < orig_queue_depth)
+		atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
+
+	printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
+			dev, queue_depth);
+	return 0;
+}
+
+int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
+{
+	int force = 0; /* Force setting for VDEVS */
+
+	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+		printk(KERN_ERR "dev[%p]: Unable to change SE Device"
+			" max_sectors while dev_export_obj: %d count exists\n",
+			dev, atomic_read(&dev->dev_export_obj.obj_access_count));
+		return -1;
+	}
+	if (!(max_sectors)) {
+		printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
+			" max_sectors\n", dev);
+		return -1;
+	}
+	if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
+		printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
+			" DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
+				DA_STATUS_MAX_SECTORS_MIN);
+		return -1;
+	}
+	if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
+		if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
+			printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
+				" greater than TCM/SE_Device max_sectors:"
+				" %u\n", dev, max_sectors,
+				DEV_ATTRIB(dev)->hw_max_sectors);
+			 return -1;
+		}
+	} else {
+		if (!(force) && (max_sectors >
+				 DEV_ATTRIB(dev)->hw_max_sectors)) {
+			printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
+				" greater than TCM/SE_Device max_sectors"
+				": %u, use force=1 to override.\n", dev,
+				max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
+			return -1;
+		}
+		if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
+			printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
+				" greater than DA_STATUS_MAX_SECTORS_MAX:"
+				" %u\n", dev, max_sectors,
+				DA_STATUS_MAX_SECTORS_MAX);
+			return -1;
+		}
+	}
+
+	DEV_ATTRIB(dev)->max_sectors = max_sectors;
+	printk("dev[%p]: SE Device max_sectors changed to %u\n",
+			dev, max_sectors);
+	return 0;
+}
+
+int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
+{
+	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+		printk(KERN_ERR "dev[%p]: Unable to change SE Device"
+			" optimal_sectors while dev_export_obj: %d count exists\n",
+			dev, atomic_read(&dev->dev_export_obj.obj_access_count));
+		return -EINVAL;
+	}
+	if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
+		printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
+				" changed for TCM/pSCSI\n", dev);
+		return -EINVAL;
+	}
+	if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
+		printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
+			" greater than max_sectors: %u\n", dev,
+			optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
+		return -EINVAL;
+	}
+
+	DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
+	printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
+			dev, optimal_sectors);
+	return 0;
+}
+
+int se_dev_set_block_size(struct se_device *dev, u32 block_size)
+{
+	if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
+		printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
+			" while dev_export_obj: %d count exists\n", dev,
+			atomic_read(&dev->dev_export_obj.obj_access_count));
+		return -1;
+	}
+
+	if ((block_size != 512) &&
+	    (block_size != 1024) &&
+	    (block_size != 2048) &&
+	    (block_size != 4096)) {
+		printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
+			" for SE device, must be 512, 1024, 2048 or 4096\n",
+			dev, block_size);
+		return -1;
+	}
+
+	if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
+		printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
+			" Physical Device, use for Linux/SCSI to change"
+			" block_size for underlying hardware\n", dev);
+		return -1;
+	}
+
+	DEV_ATTRIB(dev)->block_size = block_size;
+	printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
+			dev, block_size);
+	return 0;
+}
+
+struct se_lun *core_dev_add_lun(
+	struct se_portal_group *tpg,
+	struct se_hba *hba,
+	struct se_device *dev,
+	u32 lun)
+{
+	struct se_lun *lun_p;
+	u32 lun_access = 0;
+
+	if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
+		printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
+			atomic_read(&dev->dev_access_obj.obj_access_count));
+		return NULL;
+	}
+
+	lun_p = core_tpg_pre_addlun(tpg, lun);
+	if ((IS_ERR(lun_p)) || !(lun_p))
+		return NULL;
+
+	if (dev->dev_flags & DF_READ_ONLY)
+		lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
+	else
+		lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
+
+	if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
+		return NULL;
+
+	printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
+		" CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
+		TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
+	/*
+	 * Update LUN maps for dynamically added initiators when
+	 * generate_node_acl is enabled.
+	 */
+	if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
+		struct se_node_acl *acl;
+		spin_lock_bh(&tpg->acl_node_lock);
+		list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
+			if (acl->dynamic_node_acl) {
+				spin_unlock_bh(&tpg->acl_node_lock);
+				core_tpg_add_node_to_devs(acl, tpg);
+				spin_lock_bh(&tpg->acl_node_lock);
+			}
+		}
+		spin_unlock_bh(&tpg->acl_node_lock);
+	}
+
+	return lun_p;
+}
+
+/*      core_dev_del_lun():
+ *
+ *
+ */
+int core_dev_del_lun(
+	struct se_portal_group *tpg,
+	u32 unpacked_lun)
+{
+	struct se_lun *lun;
+	int ret = 0;
+
+	lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
+	if (!(lun))
+		return ret;
+
+	core_tpg_post_dellun(tpg, lun);
+
+	printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
+		" device object\n", TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
+		TPG_TFO(tpg)->get_fabric_name());
+
+	return 0;
+}
+
+struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
+{
+	struct se_lun *lun;
+
+	spin_lock(&tpg->tpg_lun_lock);
+	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
+		printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
+			"_PER_TPG-1: %u for Target Portal Group: %hu\n",
+			TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
+			TRANSPORT_MAX_LUNS_PER_TPG-1,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock(&tpg->tpg_lun_lock);
+		return NULL;
+	}
+	lun = &tpg->tpg_lun_list[unpacked_lun];
+
+	if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
+		printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
+			" Target Portal Group: %hu, ignoring request.\n",
+			TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock(&tpg->tpg_lun_lock);
+		return NULL;
+	}
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	return lun;
+}
+
+/*      core_dev_get_lun():
+ *
+ *
+ */
+static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
+{
+	struct se_lun *lun;
+
+	spin_lock(&tpg->tpg_lun_lock);
+	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
+		printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
+			"_TPG-1: %u for Target Portal Group: %hu\n",
+			TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
+			TRANSPORT_MAX_LUNS_PER_TPG-1,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock(&tpg->tpg_lun_lock);
+		return NULL;
+	}
+	lun = &tpg->tpg_lun_list[unpacked_lun];
+
+	if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
+		printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
+			" Target Portal Group: %hu, ignoring request.\n",
+			TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock(&tpg->tpg_lun_lock);
+		return NULL;
+	}
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	return lun;
+}
+
+struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
+	struct se_portal_group *tpg,
+	u32 mapped_lun,
+	char *initiatorname,
+	int *ret)
+{
+	struct se_lun_acl *lacl;
+	struct se_node_acl *nacl;
+
+	if (strlen(initiatorname) > TRANSPORT_IQN_LEN) {
+		printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
+			TPG_TFO(tpg)->get_fabric_name());
+		*ret = -EOVERFLOW;
+		return NULL;
+	}
+	nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if (!(nacl)) {
+		*ret = -EINVAL;
+		return NULL;
+	}
+	lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
+	if (!(lacl)) {
+		printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
+		*ret = -ENOMEM;
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&lacl->lacl_list);
+	lacl->mapped_lun = mapped_lun;
+	lacl->se_lun_nacl = nacl;
+	snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
+
+	return lacl;
+}
+
+int core_dev_add_initiator_node_lun_acl(
+	struct se_portal_group *tpg,
+	struct se_lun_acl *lacl,
+	u32 unpacked_lun,
+	u32 lun_access)
+{
+	struct se_lun *lun;
+	struct se_node_acl *nacl;
+
+	lun = core_dev_get_lun(tpg, unpacked_lun);
+	if (!(lun)) {
+		printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
+			" Target Portal Group: %hu, ignoring request.\n",
+			TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		return -EINVAL;
+	}
+
+	nacl = lacl->se_lun_nacl;
+	if (!(nacl))
+		return -EINVAL;
+
+	if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
+	    (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
+		lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
+
+	lacl->se_lun = lun;
+
+	if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
+			lun_access, nacl, tpg, 1) < 0)
+		return -EINVAL;
+
+	spin_lock(&lun->lun_acl_lock);
+	list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
+	atomic_inc(&lun->lun_acl_count);
+	smp_mb__after_atomic_inc();
+	spin_unlock(&lun->lun_acl_lock);
+
+	printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
+		" InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
+		(lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
+		lacl->initiatorname);
+	/*
+	 * Check to see if there are any existing persistent reservation APTPL
+	 * pre-registrations that need to be enabled for this LUN ACL..
+	 */
+	core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
+	return 0;
+}
+
+/*      core_dev_del_initiator_node_lun_acl():
+ *
+ *
+ */
+int core_dev_del_initiator_node_lun_acl(
+	struct se_portal_group *tpg,
+	struct se_lun *lun,
+	struct se_lun_acl *lacl)
+{
+	struct se_node_acl *nacl;
+
+	nacl = lacl->se_lun_nacl;
+	if (!(nacl))
+		return -EINVAL;
+
+	spin_lock(&lun->lun_acl_lock);
+	list_del(&lacl->lacl_list);
+	atomic_dec(&lun->lun_acl_count);
+	smp_mb__after_atomic_dec();
+	spin_unlock(&lun->lun_acl_lock);
+
+	core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
+		TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
+
+	lacl->se_lun = NULL;
+
+	printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
+		" InitiatorNode: %s Mapped LUN: %u\n",
+		TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
+		lacl->initiatorname, lacl->mapped_lun);
+
+	return 0;
+}
+
+void core_dev_free_initiator_node_lun_acl(
+	struct se_portal_group *tpg,
+	struct se_lun_acl *lacl)
+{
+	printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
+		" Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg),
+		TPG_TFO(tpg)->get_fabric_name(),
+		lacl->initiatorname, lacl->mapped_lun);
+
+	kfree(lacl);
+}
+
+int core_dev_setup_virtual_lun0(void)
+{
+	struct se_hba *hba;
+	struct se_device *dev;
+	struct se_subsystem_dev *se_dev = NULL;
+	struct se_subsystem_api *t;
+	char buf[16];
+	int ret;
+
+	hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
+	if (IS_ERR(hba))
+		return PTR_ERR(hba);
+
+	se_global->g_lun0_hba = hba;
+	t = hba->transport;
+
+	se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
+	if (!(se_dev)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+				" struct se_subsystem_dev\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	INIT_LIST_HEAD(&se_dev->g_se_dev_list);
+	INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
+	spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
+	INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
+	INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
+	spin_lock_init(&se_dev->t10_reservation.registration_lock);
+	spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
+	INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
+	spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
+	spin_lock_init(&se_dev->se_dev_lock);
+	se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
+	se_dev->t10_wwn.t10_sub_dev = se_dev;
+	se_dev->t10_alua.t10_sub_dev = se_dev;
+	se_dev->se_dev_attrib.da_sub_dev = se_dev;
+	se_dev->se_dev_hba = hba;
+
+	se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
+	if (!(se_dev->se_dev_su_ptr)) {
+		printk(KERN_ERR "Unable to locate subsystem dependent pointer"
+			" from allocate_virtdevice()\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	se_global->g_lun0_su_dev = se_dev;
+
+	memset(buf, 0, 16);
+	sprintf(buf, "rd_pages=8");
+	t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
+
+	dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
+	if (!(dev) || IS_ERR(dev)) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	se_dev->se_dev_ptr = dev;
+	se_global->g_lun0_dev = dev;
+
+	return 0;
+out:
+	se_global->g_lun0_su_dev = NULL;
+	kfree(se_dev);
+	if (se_global->g_lun0_hba) {
+		core_delete_hba(se_global->g_lun0_hba);
+		se_global->g_lun0_hba = NULL;
+	}
+	return ret;
+}
+
+
+void core_dev_release_virtual_lun0(void)
+{
+	struct se_hba *hba = se_global->g_lun0_hba;
+	struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
+
+	if (!(hba))
+		return;
+
+	if (se_global->g_lun0_dev)
+		se_free_virtual_device(se_global->g_lun0_dev, hba);
+
+	kfree(su_dev);
+	core_delete_hba(hba);
+}
diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c
new file mode 100644
index 0000000..32b148d
--- /dev/null
+++ b/drivers/target/target_core_fabric_configfs.c
@@ -0,0 +1,996 @@
+/*******************************************************************************
+* Filename: target_core_fabric_configfs.c
+ *
+ * This file contains generic fabric module configfs infrastructure for
+ * TCM v4.x code
+ *
+ * Copyright (c) 2010 Rising Tide Systems
+ * Copyright (c) 2010 Linux-iSCSI.org
+ *
+ * Copyright (c) 2010 Nicholas A. Bellinger <nab@linux-iscsi.org>
+*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ ****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <generated/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+#include <linux/syscalls.h>
+#include <linux/configfs.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_fabric_configfs.h>
+#include <target/target_core_configfs.h>
+#include <target/configfs_macros.h>
+
+#include "target_core_alua.h"
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+
+#define TF_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)		\
+static void target_fabric_setup_##_name##_cit(struct target_fabric_configfs *tf) \
+{									\
+	struct target_fabric_configfs_template *tfc = &tf->tf_cit_tmpl;	\
+	struct config_item_type *cit = &tfc->tfc_##_name##_cit;		\
+									\
+	cit->ct_item_ops = _item_ops;					\
+	cit->ct_group_ops = _group_ops;					\
+	cit->ct_attrs = _attrs;						\
+	cit->ct_owner = tf->tf_module;					\
+	printk("Setup generic %s\n", __stringify(_name));		\
+}
+
+/* Start of tfc_tpg_mappedlun_cit */
+
+static int target_fabric_mappedlun_link(
+	struct config_item *lun_acl_ci,
+	struct config_item *lun_ci)
+{
+	struct se_dev_entry *deve;
+	struct se_lun *lun = container_of(to_config_group(lun_ci),
+			struct se_lun, lun_group);
+	struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
+			struct se_lun_acl, se_lun_group);
+	struct se_portal_group *se_tpg;
+	struct config_item *nacl_ci, *tpg_ci, *tpg_ci_s, *wwn_ci, *wwn_ci_s;
+	int ret = 0, lun_access;
+	/*
+	 * Ensure that the source port exists
+	 */
+	if (!(lun->lun_sep) || !(lun->lun_sep->sep_tpg)) {
+		printk(KERN_ERR "Source se_lun->lun_sep or lun->lun_sep->sep"
+				"_tpg does not exist\n");
+		return -EINVAL;
+	}
+	se_tpg = lun->lun_sep->sep_tpg;
+
+	nacl_ci = &lun_acl_ci->ci_parent->ci_group->cg_item;
+	tpg_ci = &nacl_ci->ci_group->cg_item;
+	wwn_ci = &tpg_ci->ci_group->cg_item;
+	tpg_ci_s = &lun_ci->ci_parent->ci_group->cg_item;
+	wwn_ci_s = &tpg_ci_s->ci_group->cg_item;
+	/*
+	 * Make sure the SymLink is going to the same $FABRIC/$WWN/tpgt_$TPGT
+	 */
+	if (strcmp(config_item_name(wwn_ci), config_item_name(wwn_ci_s))) {
+		printk(KERN_ERR "Illegal Initiator ACL SymLink outside of %s\n",
+			config_item_name(wwn_ci));
+		return -EINVAL;
+	}
+	if (strcmp(config_item_name(tpg_ci), config_item_name(tpg_ci_s))) {
+		printk(KERN_ERR "Illegal Initiator ACL Symlink outside of %s"
+			" TPGT: %s\n", config_item_name(wwn_ci),
+			config_item_name(tpg_ci));
+		return -EINVAL;
+	}
+	/*
+	 * If this struct se_node_acl was dynamically generated with
+	 * tpg_1/attrib/generate_node_acls=1, use the existing deve->lun_flags,
+	 * which be will write protected (READ-ONLY) when
+	 * tpg_1/attrib/demo_mode_write_protect=1
+	 */
+	spin_lock_irq(&lacl->se_lun_nacl->device_list_lock);
+	deve = &lacl->se_lun_nacl->device_list[lacl->mapped_lun];
+	if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS)
+		lun_access = deve->lun_flags;
+	else
+		lun_access =
+			(TPG_TFO(se_tpg)->tpg_check_prod_mode_write_protect(
+				se_tpg)) ? TRANSPORT_LUNFLAGS_READ_ONLY :
+					   TRANSPORT_LUNFLAGS_READ_WRITE;
+	spin_unlock_irq(&lacl->se_lun_nacl->device_list_lock);
+	/*
+	 * Determine the actual mapped LUN value user wants..
+	 *
+	 * This value is what the SCSI Initiator actually sees the
+	 * iscsi/$IQN/$TPGT/lun/lun_* as on their SCSI Initiator Ports.
+	 */
+	ret = core_dev_add_initiator_node_lun_acl(se_tpg, lacl,
+			lun->unpacked_lun, lun_access);
+
+	return (ret < 0) ? -EINVAL : 0;
+}
+
+static int target_fabric_mappedlun_unlink(
+	struct config_item *lun_acl_ci,
+	struct config_item *lun_ci)
+{
+	struct se_lun *lun;
+	struct se_lun_acl *lacl = container_of(to_config_group(lun_acl_ci),
+			struct se_lun_acl, se_lun_group);
+	struct se_node_acl *nacl = lacl->se_lun_nacl;
+	struct se_dev_entry *deve = &nacl->device_list[lacl->mapped_lun];
+	struct se_portal_group *se_tpg;
+	/*
+	 * Determine if the underlying MappedLUN has already been released..
+	 */
+	if (!(deve->se_lun))
+		return 0;
+
+	lun = container_of(to_config_group(lun_ci), struct se_lun, lun_group);
+	se_tpg = lun->lun_sep->sep_tpg;
+
+	core_dev_del_initiator_node_lun_acl(se_tpg, lun, lacl);
+	return 0;
+}
+
+CONFIGFS_EATTR_STRUCT(target_fabric_mappedlun, se_lun_acl);
+#define TCM_MAPPEDLUN_ATTR(_name, _mode)				\
+static struct target_fabric_mappedlun_attribute target_fabric_mappedlun_##_name = \
+	__CONFIGFS_EATTR(_name, _mode,					\
+	target_fabric_mappedlun_show_##_name,				\
+	target_fabric_mappedlun_store_##_name);
+
+static ssize_t target_fabric_mappedlun_show_write_protect(
+	struct se_lun_acl *lacl,
+	char *page)
+{
+	struct se_node_acl *se_nacl = lacl->se_lun_nacl;
+	struct se_dev_entry *deve;
+	ssize_t len;
+
+	spin_lock_irq(&se_nacl->device_list_lock);
+	deve = &se_nacl->device_list[lacl->mapped_lun];
+	len = sprintf(page, "%d\n",
+			(deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) ?
+			1 : 0);
+	spin_unlock_irq(&se_nacl->device_list_lock);
+
+	return len;
+}
+
+static ssize_t target_fabric_mappedlun_store_write_protect(
+	struct se_lun_acl *lacl,
+	const char *page,
+	size_t count)
+{
+	struct se_node_acl *se_nacl = lacl->se_lun_nacl;
+	struct se_portal_group *se_tpg = se_nacl->se_tpg;
+	unsigned long op;
+
+	if (strict_strtoul(page, 0, &op))
+		return -EINVAL;
+
+	if ((op != 1) && (op != 0))
+		return -EINVAL;
+
+	core_update_device_list_access(lacl->mapped_lun, (op) ?
+			TRANSPORT_LUNFLAGS_READ_ONLY :
+			TRANSPORT_LUNFLAGS_READ_WRITE,
+			lacl->se_lun_nacl);
+
+	printk(KERN_INFO "%s_ConfigFS: Changed Initiator ACL: %s"
+		" Mapped LUN: %u Write Protect bit to %s\n",
+		TPG_TFO(se_tpg)->get_fabric_name(),
+		lacl->initiatorname, lacl->mapped_lun, (op) ? "ON" : "OFF");
+
+	return count;
+
+}
+
+TCM_MAPPEDLUN_ATTR(write_protect, S_IRUGO | S_IWUSR);
+
+CONFIGFS_EATTR_OPS(target_fabric_mappedlun, se_lun_acl, se_lun_group);
+
+static struct configfs_attribute *target_fabric_mappedlun_attrs[] = {
+	&target_fabric_mappedlun_write_protect.attr,
+	NULL,
+};
+
+static struct configfs_item_operations target_fabric_mappedlun_item_ops = {
+	.show_attribute		= target_fabric_mappedlun_attr_show,
+	.store_attribute	= target_fabric_mappedlun_attr_store,
+	.allow_link		= target_fabric_mappedlun_link,
+	.drop_link		= target_fabric_mappedlun_unlink,
+};
+
+TF_CIT_SETUP(tpg_mappedlun, &target_fabric_mappedlun_item_ops, NULL,
+		target_fabric_mappedlun_attrs);
+
+/* End of tfc_tpg_mappedlun_cit */
+
+/* Start of tfc_tpg_nacl_attrib_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_nacl_attrib, se_node_acl, acl_attrib_group);
+
+static struct configfs_item_operations target_fabric_nacl_attrib_item_ops = {
+	.show_attribute		= target_fabric_nacl_attrib_attr_show,
+	.store_attribute	= target_fabric_nacl_attrib_attr_store,
+};
+
+TF_CIT_SETUP(tpg_nacl_attrib, &target_fabric_nacl_attrib_item_ops, NULL, NULL);
+
+/* End of tfc_tpg_nacl_attrib_cit */
+
+/* Start of tfc_tpg_nacl_auth_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_nacl_auth, se_node_acl, acl_auth_group);
+
+static struct configfs_item_operations target_fabric_nacl_auth_item_ops = {
+	.show_attribute		= target_fabric_nacl_auth_attr_show,
+	.store_attribute	= target_fabric_nacl_auth_attr_store,
+};
+
+TF_CIT_SETUP(tpg_nacl_auth, &target_fabric_nacl_auth_item_ops, NULL, NULL);
+
+/* End of tfc_tpg_nacl_auth_cit */
+
+/* Start of tfc_tpg_nacl_param_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_nacl_param, se_node_acl, acl_param_group);
+
+static struct configfs_item_operations target_fabric_nacl_param_item_ops = {
+	.show_attribute		= target_fabric_nacl_param_attr_show,
+	.store_attribute	= target_fabric_nacl_param_attr_store,
+};
+
+TF_CIT_SETUP(tpg_nacl_param, &target_fabric_nacl_param_item_ops, NULL, NULL);
+
+/* End of tfc_tpg_nacl_param_cit */
+
+/* Start of tfc_tpg_nacl_base_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_nacl_base, se_node_acl, acl_group);
+
+static struct config_group *target_fabric_make_mappedlun(
+	struct config_group *group,
+	const char *name)
+{
+	struct se_node_acl *se_nacl = container_of(group,
+			struct se_node_acl, acl_group);
+	struct se_portal_group *se_tpg = se_nacl->se_tpg;
+	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
+	struct se_lun_acl *lacl;
+	struct config_item *acl_ci;
+	char *buf;
+	unsigned long mapped_lun;
+	int ret = 0;
+
+	acl_ci = &group->cg_item;
+	if (!(acl_ci)) {
+		printk(KERN_ERR "Unable to locatel acl_ci\n");
+		return NULL;
+	}
+
+	buf = kzalloc(strlen(name) + 1, GFP_KERNEL);
+	if (!(buf)) {
+		printk(KERN_ERR "Unable to allocate memory for name buf\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	snprintf(buf, strlen(name) + 1, "%s", name);
+	/*
+	 * Make sure user is creating iscsi/$IQN/$TPGT/acls/$INITIATOR/lun_$ID.
+	 */
+	if (strstr(buf, "lun_") != buf) {
+		printk(KERN_ERR "Unable to locate \"lun_\" from buf: %s"
+			" name: %s\n", buf, name);
+		ret = -EINVAL;
+		goto out;
+	}
+	/*
+	 * Determine the Mapped LUN value.  This is what the SCSI Initiator
+	 * Port will actually see.
+	 */
+	if (strict_strtoul(buf + 4, 0, &mapped_lun) || mapped_lun > UINT_MAX) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	lacl = core_dev_init_initiator_node_lun_acl(se_tpg, mapped_lun,
+			config_item_name(acl_ci), &ret);
+	if (!(lacl))
+		goto out;
+
+	config_group_init_type_name(&lacl->se_lun_group, name,
+			&TF_CIT_TMPL(tf)->tfc_tpg_mappedlun_cit);
+
+	kfree(buf);
+	return &lacl->se_lun_group;
+out:
+	kfree(buf);
+	return ERR_PTR(ret);
+}
+
+static void target_fabric_drop_mappedlun(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct se_lun_acl *lacl = container_of(to_config_group(item),
+			struct se_lun_acl, se_lun_group);
+	struct se_portal_group *se_tpg = lacl->se_lun_nacl->se_tpg;
+
+	config_item_put(item);
+	core_dev_free_initiator_node_lun_acl(se_tpg, lacl);
+}
+
+static struct configfs_item_operations target_fabric_nacl_base_item_ops = {
+	.show_attribute		= target_fabric_nacl_base_attr_show,
+	.store_attribute	= target_fabric_nacl_base_attr_store,
+};
+
+static struct configfs_group_operations target_fabric_nacl_base_group_ops = {
+	.make_group		= target_fabric_make_mappedlun,
+	.drop_item		= target_fabric_drop_mappedlun,
+};
+
+TF_CIT_SETUP(tpg_nacl_base, &target_fabric_nacl_base_item_ops,
+		&target_fabric_nacl_base_group_ops, NULL);
+
+/* End of tfc_tpg_nacl_base_cit */
+
+/* Start of tfc_tpg_nacl_cit */
+
+static struct config_group *target_fabric_make_nodeacl(
+	struct config_group *group,
+	const char *name)
+{
+	struct se_portal_group *se_tpg = container_of(group,
+			struct se_portal_group, tpg_acl_group);
+	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
+	struct se_node_acl *se_nacl;
+	struct config_group *nacl_cg;
+
+	if (!(tf->tf_ops.fabric_make_nodeacl)) {
+		printk(KERN_ERR "tf->tf_ops.fabric_make_nodeacl is NULL\n");
+		return ERR_PTR(-ENOSYS);
+	}
+
+	se_nacl = tf->tf_ops.fabric_make_nodeacl(se_tpg, group, name);
+	if (IS_ERR(se_nacl))
+		return ERR_PTR(PTR_ERR(se_nacl));
+
+	nacl_cg = &se_nacl->acl_group;
+	nacl_cg->default_groups = se_nacl->acl_default_groups;
+	nacl_cg->default_groups[0] = &se_nacl->acl_attrib_group;
+	nacl_cg->default_groups[1] = &se_nacl->acl_auth_group;
+	nacl_cg->default_groups[2] = &se_nacl->acl_param_group;
+	nacl_cg->default_groups[3] = NULL;
+
+	config_group_init_type_name(&se_nacl->acl_group, name,
+			&TF_CIT_TMPL(tf)->tfc_tpg_nacl_base_cit);
+	config_group_init_type_name(&se_nacl->acl_attrib_group, "attrib",
+			&TF_CIT_TMPL(tf)->tfc_tpg_nacl_attrib_cit);
+	config_group_init_type_name(&se_nacl->acl_auth_group, "auth",
+			&TF_CIT_TMPL(tf)->tfc_tpg_nacl_auth_cit);
+	config_group_init_type_name(&se_nacl->acl_param_group, "param",
+			&TF_CIT_TMPL(tf)->tfc_tpg_nacl_param_cit);
+
+	return &se_nacl->acl_group;
+}
+
+static void target_fabric_drop_nodeacl(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct se_portal_group *se_tpg = container_of(group,
+			struct se_portal_group, tpg_acl_group);
+	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
+	struct se_node_acl *se_nacl = container_of(to_config_group(item),
+			struct se_node_acl, acl_group);
+	struct config_item *df_item;
+	struct config_group *nacl_cg;
+	int i;
+
+	nacl_cg = &se_nacl->acl_group;
+	for (i = 0; nacl_cg->default_groups[i]; i++) {
+		df_item = &nacl_cg->default_groups[i]->cg_item;
+		nacl_cg->default_groups[i] = NULL;
+		config_item_put(df_item);
+	}
+
+	config_item_put(item);
+	tf->tf_ops.fabric_drop_nodeacl(se_nacl);
+}
+
+static struct configfs_group_operations target_fabric_nacl_group_ops = {
+	.make_group	= target_fabric_make_nodeacl,
+	.drop_item	= target_fabric_drop_nodeacl,
+};
+
+TF_CIT_SETUP(tpg_nacl, NULL, &target_fabric_nacl_group_ops, NULL);
+
+/* End of tfc_tpg_nacl_cit */
+
+/* Start of tfc_tpg_np_base_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_np_base, se_tpg_np, tpg_np_group);
+
+static struct configfs_item_operations target_fabric_np_base_item_ops = {
+	.show_attribute		= target_fabric_np_base_attr_show,
+	.store_attribute	= target_fabric_np_base_attr_store,
+};
+
+TF_CIT_SETUP(tpg_np_base, &target_fabric_np_base_item_ops, NULL, NULL);
+
+/* End of tfc_tpg_np_base_cit */
+
+/* Start of tfc_tpg_np_cit */
+
+static struct config_group *target_fabric_make_np(
+	struct config_group *group,
+	const char *name)
+{
+	struct se_portal_group *se_tpg = container_of(group,
+				struct se_portal_group, tpg_np_group);
+	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
+	struct se_tpg_np *se_tpg_np;
+
+	if (!(tf->tf_ops.fabric_make_np)) {
+		printk(KERN_ERR "tf->tf_ops.fabric_make_np is NULL\n");
+		return ERR_PTR(-ENOSYS);
+	}
+
+	se_tpg_np = tf->tf_ops.fabric_make_np(se_tpg, group, name);
+	if (!(se_tpg_np) || IS_ERR(se_tpg_np))
+		return ERR_PTR(-EINVAL);
+
+	config_group_init_type_name(&se_tpg_np->tpg_np_group, name,
+			&TF_CIT_TMPL(tf)->tfc_tpg_np_base_cit);
+
+	return &se_tpg_np->tpg_np_group;
+}
+
+static void target_fabric_drop_np(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct se_portal_group *se_tpg = container_of(group,
+				struct se_portal_group, tpg_np_group);
+	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
+	struct se_tpg_np *se_tpg_np = container_of(to_config_group(item),
+				struct se_tpg_np, tpg_np_group);
+
+	config_item_put(item);
+	tf->tf_ops.fabric_drop_np(se_tpg_np);
+}
+
+static struct configfs_group_operations target_fabric_np_group_ops = {
+	.make_group	= &target_fabric_make_np,
+	.drop_item	= &target_fabric_drop_np,
+};
+
+TF_CIT_SETUP(tpg_np, NULL, &target_fabric_np_group_ops, NULL);
+
+/* End of tfc_tpg_np_cit */
+
+/* Start of tfc_tpg_port_cit */
+
+CONFIGFS_EATTR_STRUCT(target_fabric_port, se_lun);
+#define TCM_PORT_ATTR(_name, _mode)					\
+static struct target_fabric_port_attribute target_fabric_port_##_name =	\
+	__CONFIGFS_EATTR(_name, _mode,					\
+	target_fabric_port_show_attr_##_name,				\
+	target_fabric_port_store_attr_##_name);
+
+#define TCM_PORT_ATTOR_RO(_name)					\
+	__CONFIGFS_EATTR_RO(_name,					\
+	target_fabric_port_show_attr_##_name);
+
+/*
+ * alua_tg_pt_gp
+ */
+static ssize_t target_fabric_port_show_attr_alua_tg_pt_gp(
+	struct se_lun *lun,
+	char *page)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_show_tg_pt_gp_info(lun->lun_sep, page);
+}
+
+static ssize_t target_fabric_port_store_attr_alua_tg_pt_gp(
+	struct se_lun *lun,
+	const char *page,
+	size_t count)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_store_tg_pt_gp_info(lun->lun_sep, page, count);
+}
+
+TCM_PORT_ATTR(alua_tg_pt_gp, S_IRUGO | S_IWUSR);
+
+/*
+ * alua_tg_pt_offline
+ */
+static ssize_t target_fabric_port_show_attr_alua_tg_pt_offline(
+	struct se_lun *lun,
+	char *page)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_show_offline_bit(lun, page);
+}
+
+static ssize_t target_fabric_port_store_attr_alua_tg_pt_offline(
+	struct se_lun *lun,
+	const char *page,
+	size_t count)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_store_offline_bit(lun, page, count);
+}
+
+TCM_PORT_ATTR(alua_tg_pt_offline, S_IRUGO | S_IWUSR);
+
+/*
+ * alua_tg_pt_status
+ */
+static ssize_t target_fabric_port_show_attr_alua_tg_pt_status(
+	struct se_lun *lun,
+	char *page)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_show_secondary_status(lun, page);
+}
+
+static ssize_t target_fabric_port_store_attr_alua_tg_pt_status(
+	struct se_lun *lun,
+	const char *page,
+	size_t count)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_store_secondary_status(lun, page, count);
+}
+
+TCM_PORT_ATTR(alua_tg_pt_status, S_IRUGO | S_IWUSR);
+
+/*
+ * alua_tg_pt_write_md
+ */
+static ssize_t target_fabric_port_show_attr_alua_tg_pt_write_md(
+	struct se_lun *lun,
+	char *page)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_show_secondary_write_metadata(lun, page);
+}
+
+static ssize_t target_fabric_port_store_attr_alua_tg_pt_write_md(
+	struct se_lun *lun,
+	const char *page,
+	size_t count)
+{
+	if (!(lun))
+		return -ENODEV;
+
+	if (!(lun->lun_sep))
+		return -ENODEV;
+
+	return core_alua_store_secondary_write_metadata(lun, page, count);
+}
+
+TCM_PORT_ATTR(alua_tg_pt_write_md, S_IRUGO | S_IWUSR);
+
+
+static struct configfs_attribute *target_fabric_port_attrs[] = {
+	&target_fabric_port_alua_tg_pt_gp.attr,
+	&target_fabric_port_alua_tg_pt_offline.attr,
+	&target_fabric_port_alua_tg_pt_status.attr,
+	&target_fabric_port_alua_tg_pt_write_md.attr,
+	NULL,
+};
+
+CONFIGFS_EATTR_OPS(target_fabric_port, se_lun, lun_group);
+
+static int target_fabric_port_link(
+	struct config_item *lun_ci,
+	struct config_item *se_dev_ci)
+{
+	struct config_item *tpg_ci;
+	struct se_device *dev;
+	struct se_lun *lun = container_of(to_config_group(lun_ci),
+				struct se_lun, lun_group);
+	struct se_lun *lun_p;
+	struct se_portal_group *se_tpg;
+	struct se_subsystem_dev *se_dev = container_of(
+				to_config_group(se_dev_ci), struct se_subsystem_dev,
+				se_dev_group);
+	struct target_fabric_configfs *tf;
+	int ret;
+
+	tpg_ci = &lun_ci->ci_parent->ci_group->cg_item;
+	se_tpg = container_of(to_config_group(tpg_ci),
+				struct se_portal_group, tpg_group);
+	tf = se_tpg->se_tpg_wwn->wwn_tf;
+
+	if (lun->lun_se_dev !=  NULL) {
+		printk(KERN_ERR "Port Symlink already exists\n");
+		return -EEXIST;
+	}
+
+	dev = se_dev->se_dev_ptr;
+	if (!(dev)) {
+		printk(KERN_ERR "Unable to locate struct se_device pointer from"
+			" %s\n", config_item_name(se_dev_ci));
+		ret = -ENODEV;
+		goto out;
+	}
+
+	lun_p = core_dev_add_lun(se_tpg, dev->se_hba, dev,
+				lun->unpacked_lun);
+	if ((IS_ERR(lun_p)) || !(lun_p)) {
+		printk(KERN_ERR "core_dev_add_lun() failed\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (tf->tf_ops.fabric_post_link) {
+		/*
+		 * Call the optional fabric_post_link() to allow a
+		 * fabric module to setup any additional state once
+		 * core_dev_add_lun() has been called..
+		 */
+		tf->tf_ops.fabric_post_link(se_tpg, lun);
+	}
+
+	return 0;
+out:
+	return ret;
+}
+
+static int target_fabric_port_unlink(
+	struct config_item *lun_ci,
+	struct config_item *se_dev_ci)
+{
+	struct se_lun *lun = container_of(to_config_group(lun_ci),
+				struct se_lun, lun_group);
+	struct se_portal_group *se_tpg = lun->lun_sep->sep_tpg;
+	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
+
+	if (tf->tf_ops.fabric_pre_unlink) {
+		/*
+		 * Call the optional fabric_pre_unlink() to allow a
+		 * fabric module to release any additional stat before
+		 * core_dev_del_lun() is called.
+		*/
+		tf->tf_ops.fabric_pre_unlink(se_tpg, lun);
+	}
+
+	core_dev_del_lun(se_tpg, lun->unpacked_lun);
+	return 0;
+}
+
+static struct configfs_item_operations target_fabric_port_item_ops = {
+	.show_attribute		= target_fabric_port_attr_show,
+	.store_attribute	= target_fabric_port_attr_store,
+	.allow_link		= target_fabric_port_link,
+	.drop_link		= target_fabric_port_unlink,
+};
+
+TF_CIT_SETUP(tpg_port, &target_fabric_port_item_ops, NULL, target_fabric_port_attrs);
+
+/* End of tfc_tpg_port_cit */
+
+/* Start of tfc_tpg_lun_cit */
+
+static struct config_group *target_fabric_make_lun(
+	struct config_group *group,
+	const char *name)
+{
+	struct se_lun *lun;
+	struct se_portal_group *se_tpg = container_of(group,
+			struct se_portal_group, tpg_lun_group);
+	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
+	unsigned long unpacked_lun;
+
+	if (strstr(name, "lun_") != name) {
+		printk(KERN_ERR "Unable to locate \'_\" in"
+				" \"lun_$LUN_NUMBER\"\n");
+		return ERR_PTR(-EINVAL);
+	}
+	if (strict_strtoul(name + 4, 0, &unpacked_lun) || unpacked_lun > UINT_MAX)
+		return ERR_PTR(-EINVAL);
+
+	lun = core_get_lun_from_tpg(se_tpg, unpacked_lun);
+	if (!(lun))
+		return ERR_PTR(-EINVAL);
+
+	config_group_init_type_name(&lun->lun_group, name,
+			&TF_CIT_TMPL(tf)->tfc_tpg_port_cit);
+
+	return &lun->lun_group;
+}
+
+static void target_fabric_drop_lun(
+	struct config_group *group,
+	struct config_item *item)
+{
+	config_item_put(item);
+}
+
+static struct configfs_group_operations target_fabric_lun_group_ops = {
+	.make_group	= &target_fabric_make_lun,
+	.drop_item	= &target_fabric_drop_lun,
+};
+
+TF_CIT_SETUP(tpg_lun, NULL, &target_fabric_lun_group_ops, NULL);
+
+/* End of tfc_tpg_lun_cit */
+
+/* Start of tfc_tpg_attrib_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_tpg_attrib, se_portal_group, tpg_attrib_group);
+
+static struct configfs_item_operations target_fabric_tpg_attrib_item_ops = {
+	.show_attribute		= target_fabric_tpg_attrib_attr_show,
+	.store_attribute	= target_fabric_tpg_attrib_attr_store,
+};
+
+TF_CIT_SETUP(tpg_attrib, &target_fabric_tpg_attrib_item_ops, NULL, NULL);
+
+/* End of tfc_tpg_attrib_cit */
+
+/* Start of tfc_tpg_param_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_tpg_param, se_portal_group, tpg_param_group);
+
+static struct configfs_item_operations target_fabric_tpg_param_item_ops = {
+	.show_attribute		= target_fabric_tpg_param_attr_show,
+	.store_attribute	= target_fabric_tpg_param_attr_store,
+};
+
+TF_CIT_SETUP(tpg_param, &target_fabric_tpg_param_item_ops, NULL, NULL);
+
+/* End of tfc_tpg_param_cit */
+
+/* Start of tfc_tpg_base_cit */
+/*
+ * For use with TF_TPG_ATTR() and TF_TPG_ATTR_RO()
+ */
+CONFIGFS_EATTR_OPS(target_fabric_tpg, se_portal_group, tpg_group);
+
+static struct configfs_item_operations target_fabric_tpg_base_item_ops = {
+	.show_attribute		= target_fabric_tpg_attr_show,
+	.store_attribute	= target_fabric_tpg_attr_store,
+};
+
+TF_CIT_SETUP(tpg_base, &target_fabric_tpg_base_item_ops, NULL, NULL);
+
+/* End of tfc_tpg_base_cit */
+
+/* Start of tfc_tpg_cit */
+
+static struct config_group *target_fabric_make_tpg(
+	struct config_group *group,
+	const char *name)
+{
+	struct se_wwn *wwn = container_of(group, struct se_wwn, wwn_group);
+	struct target_fabric_configfs *tf = wwn->wwn_tf;
+	struct se_portal_group *se_tpg;
+
+	if (!(tf->tf_ops.fabric_make_tpg)) {
+		printk(KERN_ERR "tf->tf_ops.fabric_make_tpg is NULL\n");
+		return ERR_PTR(-ENOSYS);
+	}
+
+	se_tpg = tf->tf_ops.fabric_make_tpg(wwn, group, name);
+	if (!(se_tpg) || IS_ERR(se_tpg))
+		return ERR_PTR(-EINVAL);
+	/*
+	 * Setup default groups from pre-allocated se_tpg->tpg_default_groups
+	 */
+	se_tpg->tpg_group.default_groups = se_tpg->tpg_default_groups;
+	se_tpg->tpg_group.default_groups[0] = &se_tpg->tpg_lun_group;
+	se_tpg->tpg_group.default_groups[1] = &se_tpg->tpg_np_group;
+	se_tpg->tpg_group.default_groups[2] = &se_tpg->tpg_acl_group;
+	se_tpg->tpg_group.default_groups[3] = &se_tpg->tpg_attrib_group;
+	se_tpg->tpg_group.default_groups[4] = &se_tpg->tpg_param_group;
+	se_tpg->tpg_group.default_groups[5] = NULL;
+
+	config_group_init_type_name(&se_tpg->tpg_group, name,
+			&TF_CIT_TMPL(tf)->tfc_tpg_base_cit);
+	config_group_init_type_name(&se_tpg->tpg_lun_group, "lun",
+			&TF_CIT_TMPL(tf)->tfc_tpg_lun_cit);
+	config_group_init_type_name(&se_tpg->tpg_np_group, "np",
+			&TF_CIT_TMPL(tf)->tfc_tpg_np_cit);
+	config_group_init_type_name(&se_tpg->tpg_acl_group, "acls",
+			&TF_CIT_TMPL(tf)->tfc_tpg_nacl_cit);
+	config_group_init_type_name(&se_tpg->tpg_attrib_group, "attrib",
+			&TF_CIT_TMPL(tf)->tfc_tpg_attrib_cit);
+	config_group_init_type_name(&se_tpg->tpg_param_group, "param",
+			&TF_CIT_TMPL(tf)->tfc_tpg_param_cit);
+
+	return &se_tpg->tpg_group;
+}
+
+static void target_fabric_drop_tpg(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct se_wwn *wwn = container_of(group, struct se_wwn, wwn_group);
+	struct target_fabric_configfs *tf = wwn->wwn_tf;
+	struct se_portal_group *se_tpg = container_of(to_config_group(item),
+				struct se_portal_group, tpg_group);
+	struct config_group *tpg_cg = &se_tpg->tpg_group;
+	struct config_item *df_item;
+	int i;
+	/*
+	 * Release default groups, but do not release tpg_cg->default_groups
+	 * memory as it is statically allocated at se_tpg->tpg_default_groups.
+	 */
+	for (i = 0; tpg_cg->default_groups[i]; i++) {
+		df_item = &tpg_cg->default_groups[i]->cg_item;
+		tpg_cg->default_groups[i] = NULL;
+		config_item_put(df_item);
+	}
+
+	config_item_put(item);
+	tf->tf_ops.fabric_drop_tpg(se_tpg);
+}
+
+static struct configfs_group_operations target_fabric_tpg_group_ops = {
+	.make_group	= target_fabric_make_tpg,
+	.drop_item	= target_fabric_drop_tpg,
+};
+
+TF_CIT_SETUP(tpg, NULL, &target_fabric_tpg_group_ops, NULL);
+
+/* End of tfc_tpg_cit */
+
+/* Start of tfc_wwn_cit */
+
+static struct config_group *target_fabric_make_wwn(
+	struct config_group *group,
+	const char *name)
+{
+	struct target_fabric_configfs *tf = container_of(group,
+				struct target_fabric_configfs, tf_group);
+	struct se_wwn *wwn;
+
+	if (!(tf->tf_ops.fabric_make_wwn)) {
+		printk(KERN_ERR "tf->tf_ops.fabric_make_wwn is NULL\n");
+		return ERR_PTR(-ENOSYS);
+	}
+
+	wwn = tf->tf_ops.fabric_make_wwn(tf, group, name);
+	if (!(wwn) || IS_ERR(wwn))
+		return ERR_PTR(-EINVAL);
+
+	wwn->wwn_tf = tf;
+	config_group_init_type_name(&wwn->wwn_group, name,
+			&TF_CIT_TMPL(tf)->tfc_tpg_cit);
+
+	return &wwn->wwn_group;
+}
+
+static void target_fabric_drop_wwn(
+	struct config_group *group,
+	struct config_item *item)
+{
+	struct target_fabric_configfs *tf = container_of(group,
+				struct target_fabric_configfs, tf_group);
+	struct se_wwn *wwn = container_of(to_config_group(item),
+				struct se_wwn, wwn_group);
+
+	config_item_put(item);
+	tf->tf_ops.fabric_drop_wwn(wwn);
+}
+
+static struct configfs_group_operations target_fabric_wwn_group_ops = {
+	.make_group	= target_fabric_make_wwn,
+	.drop_item	= target_fabric_drop_wwn,
+};
+/*
+ * For use with TF_WWN_ATTR() and TF_WWN_ATTR_RO()
+ */
+CONFIGFS_EATTR_OPS(target_fabric_wwn, target_fabric_configfs, tf_group);
+
+static struct configfs_item_operations target_fabric_wwn_item_ops = {
+	.show_attribute		= target_fabric_wwn_attr_show,
+	.store_attribute	= target_fabric_wwn_attr_store,
+};
+
+TF_CIT_SETUP(wwn, &target_fabric_wwn_item_ops, &target_fabric_wwn_group_ops, NULL);
+
+/* End of tfc_wwn_cit */
+
+/* Start of tfc_discovery_cit */
+
+CONFIGFS_EATTR_OPS(target_fabric_discovery, target_fabric_configfs,
+		tf_disc_group);
+
+static struct configfs_item_operations target_fabric_discovery_item_ops = {
+	.show_attribute		= target_fabric_discovery_attr_show,
+	.store_attribute	= target_fabric_discovery_attr_store,
+};
+
+TF_CIT_SETUP(discovery, &target_fabric_discovery_item_ops, NULL, NULL);
+
+/* End of tfc_discovery_cit */
+
+int target_fabric_setup_cits(struct target_fabric_configfs *tf)
+{
+	target_fabric_setup_discovery_cit(tf);
+	target_fabric_setup_wwn_cit(tf);
+	target_fabric_setup_tpg_cit(tf);
+	target_fabric_setup_tpg_base_cit(tf);
+	target_fabric_setup_tpg_port_cit(tf);
+	target_fabric_setup_tpg_lun_cit(tf);
+	target_fabric_setup_tpg_np_cit(tf);
+	target_fabric_setup_tpg_np_base_cit(tf);
+	target_fabric_setup_tpg_attrib_cit(tf);
+	target_fabric_setup_tpg_param_cit(tf);
+	target_fabric_setup_tpg_nacl_cit(tf);
+	target_fabric_setup_tpg_nacl_base_cit(tf);
+	target_fabric_setup_tpg_nacl_attrib_cit(tf);
+	target_fabric_setup_tpg_nacl_auth_cit(tf);
+	target_fabric_setup_tpg_nacl_param_cit(tf);
+	target_fabric_setup_tpg_mappedlun_cit(tf);
+
+	return 0;
+}
diff --git a/drivers/target/target_core_fabric_lib.c b/drivers/target/target_core_fabric_lib.c
new file mode 100644
index 0000000..2628564
--- /dev/null
+++ b/drivers/target/target_core_fabric_lib.c
@@ -0,0 +1,451 @@
+/*******************************************************************************
+ * Filename:  target_core_fabric_lib.c
+ *
+ * This file contains generic high level protocol identifier and PR
+ * handlers for TCM fabric modules
+ *
+ * Copyright (c) 2010 Rising Tide Systems, Inc.
+ * Copyright (c) 2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@linux-iscsi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+
+/*
+ * Handlers for Serial Attached SCSI (SAS)
+ */
+u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg)
+{
+	/*
+	 * Return a SAS Serial SCSI Protocol identifier for loopback operations
+	 * This is defined in  section 7.5.1 Table 362 in spc4r17
+	 */
+	return 0x6;
+}
+EXPORT_SYMBOL(sas_get_fabric_proto_ident);
+
+u32 sas_get_pr_transport_id(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct t10_pr_registration *pr_reg,
+	int *format_code,
+	unsigned char *buf)
+{
+	unsigned char binary, *ptr;
+	int i;
+	u32 off = 4;
+	/*
+	 * Set PROTOCOL IDENTIFIER to 6h for SAS
+	 */
+	buf[0] = 0x06;
+	/*
+	 * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
+	 * over SAS Serial SCSI Protocol
+	 */
+	ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
+
+	for (i = 0; i < 16; i += 2) {
+		binary = transport_asciihex_to_binaryhex(&ptr[i]);
+		buf[off++] = binary;
+	}
+	/*
+	 * The SAS Transport ID is a hardcoded 24-byte length
+	 */
+	return 24;
+}
+EXPORT_SYMBOL(sas_get_pr_transport_id);
+
+u32 sas_get_pr_transport_id_len(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct t10_pr_registration *pr_reg,
+	int *format_code)
+{
+	*format_code = 0;
+	/*
+	 * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
+	 * over SAS Serial SCSI Protocol
+	 *
+	 * The SAS Transport ID is a hardcoded 24-byte length
+	 */
+	return 24;
+}
+EXPORT_SYMBOL(sas_get_pr_transport_id_len);
+
+/*
+ * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
+ * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
+ */
+char *sas_parse_pr_out_transport_id(
+	struct se_portal_group *se_tpg,
+	const char *buf,
+	u32 *out_tid_len,
+	char **port_nexus_ptr)
+{
+	/*
+	 * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
+	 * for initiator ports using SCSI over SAS Serial SCSI Protocol
+	 *
+	 * The TransportID for a SAS Initiator Port is of fixed size of
+	 * 24 bytes, and SAS does not contain a I_T nexus identifier,
+	 * so we return the **port_nexus_ptr set to NULL.
+	 */
+	*port_nexus_ptr = NULL;
+	*out_tid_len = 24;
+
+	return (char *)&buf[4];
+}
+EXPORT_SYMBOL(sas_parse_pr_out_transport_id);
+
+/*
+ * Handlers for Fibre Channel Protocol (FCP)
+ */
+u8 fc_get_fabric_proto_ident(struct se_portal_group *se_tpg)
+{
+	return 0x0;	/* 0 = fcp-2 per SPC4 section 7.5.1 */
+}
+EXPORT_SYMBOL(fc_get_fabric_proto_ident);
+
+u32 fc_get_pr_transport_id_len(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct t10_pr_registration *pr_reg,
+	int *format_code)
+{
+	*format_code = 0;
+	/*
+	 * The FC Transport ID is a hardcoded 24-byte length
+	 */
+	return 24;
+}
+EXPORT_SYMBOL(fc_get_pr_transport_id_len);
+
+u32 fc_get_pr_transport_id(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct t10_pr_registration *pr_reg,
+	int *format_code,
+	unsigned char *buf)
+{
+	unsigned char binary, *ptr;
+	int i;
+	u32 off = 8;
+	/*
+	 * PROTOCOL IDENTIFIER is 0h for FCP-2
+	 *
+	 * From spc4r17, 7.5.4.2 TransportID for initiator ports using
+	 * SCSI over Fibre Channel
+	 *
+	 * We convert the ASCII formatted N Port name into a binary
+	 * encoded TransportID.
+	 */
+	ptr = &se_nacl->initiatorname[0];
+
+	for (i = 0; i < 24; ) {
+		if (!(strncmp(&ptr[i], ":", 1))) {
+			i++;
+			continue;
+		}
+		binary = transport_asciihex_to_binaryhex(&ptr[i]);
+		buf[off++] = binary;
+		i += 2;
+	}
+	/*
+	 * The FC Transport ID is a hardcoded 24-byte length
+	 */
+	return 24;
+}
+EXPORT_SYMBOL(fc_get_pr_transport_id);
+
+char *fc_parse_pr_out_transport_id(
+	struct se_portal_group *se_tpg,
+	const char *buf,
+	u32 *out_tid_len,
+	char **port_nexus_ptr)
+{
+	/*
+	 * The TransportID for a FC N Port is of fixed size of
+	 * 24 bytes, and FC does not contain a I_T nexus identifier,
+	 * so we return the **port_nexus_ptr set to NULL.
+	 */
+	*port_nexus_ptr = NULL;
+	*out_tid_len = 24;
+
+	 return (char *)&buf[8];
+}
+EXPORT_SYMBOL(fc_parse_pr_out_transport_id);
+
+/*
+ * Handlers for Internet Small Computer Systems Interface (iSCSI)
+ */
+
+u8 iscsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
+{
+	/*
+	 * This value is defined for "Internet SCSI (iSCSI)"
+	 * in spc4r17 section 7.5.1 Table 362
+	 */
+	return 0x5;
+}
+EXPORT_SYMBOL(iscsi_get_fabric_proto_ident);
+
+u32 iscsi_get_pr_transport_id(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct t10_pr_registration *pr_reg,
+	int *format_code,
+	unsigned char *buf)
+{
+	u32 off = 4, padding = 0;
+	u16 len = 0;
+
+	spin_lock_irq(&se_nacl->nacl_sess_lock);
+	/*
+	 * Set PROTOCOL IDENTIFIER to 5h for iSCSI
+	*/
+	buf[0] = 0x05;
+	/*
+	 * From spc4r17 Section 7.5.4.6: TransportID for initiator
+	 * ports using SCSI over iSCSI.
+	 *
+	 * The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
+	 * shall contain the iSCSI name of an iSCSI initiator node (see
+	 * RFC 3720). The first ISCSI NAME field byte containing an ASCII
+	 * null character terminates the ISCSI NAME field without regard for
+	 * the specified length of the iSCSI TransportID or the contents of
+	 * the ADDITIONAL LENGTH field.
+	 */
+	len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
+	/*
+	 * Add Extra byte for NULL terminator
+	 */
+	len++;
+	/*
+	 * If there is ISID present with the registration and *format code == 1
+	 * 1, use iSCSI Initiator port TransportID format.
+	 *
+	 * Otherwise use iSCSI Initiator device TransportID format that
+	 * does not contain the ASCII encoded iSCSI Initiator iSID value
+	 * provied by the iSCSi Initiator during the iSCSI login process.
+	 */
+	if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
+		/*
+		 * Set FORMAT CODE 01b for iSCSI Initiator port TransportID
+		 * format.
+		 */
+		buf[0] |= 0x40;
+		/*
+		 * From spc4r17 Section 7.5.4.6: TransportID for initiator
+		 * ports using SCSI over iSCSI.  Table 390
+		 *
+		 * The SEPARATOR field shall contain the five ASCII
+		 * characters ",i,0x".
+		 *
+		 * The null-terminated, null-padded ISCSI INITIATOR SESSION ID
+		 * field shall contain the iSCSI initiator session identifier
+		 * (see RFC 3720) in the form of ASCII characters that are the
+		 * hexadecimal digits converted from the binary iSCSI initiator
+		 * session identifier value. The first ISCSI INITIATOR SESSION
+		 * ID field byte containing an ASCII null character
+		 */
+		buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
+		buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
+		buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
+		buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
+		buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
+		len += 5;
+		buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
+		buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
+		buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
+		buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
+		buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
+		buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
+		buf[off+len] = '\0'; off++;
+		len += 7;
+	}
+	spin_unlock_irq(&se_nacl->nacl_sess_lock);
+	/*
+	 * The ADDITIONAL LENGTH field specifies the number of bytes that follow
+	 * in the TransportID. The additional length shall be at least 20 and
+	 * shall be a multiple of four.
+	*/
+	padding = ((-len) & 3);
+	if (padding != 0)
+		len += padding;
+
+	buf[2] = ((len >> 8) & 0xff);
+	buf[3] = (len & 0xff);
+	/*
+	 * Increment value for total payload + header length for
+	 * full status descriptor
+	 */
+	len += 4;
+
+	return len;
+}
+EXPORT_SYMBOL(iscsi_get_pr_transport_id);
+
+u32 iscsi_get_pr_transport_id_len(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct t10_pr_registration *pr_reg,
+	int *format_code)
+{
+	u32 len = 0, padding = 0;
+
+	spin_lock_irq(&se_nacl->nacl_sess_lock);
+	len = strlen(se_nacl->initiatorname);
+	/*
+	 * Add extra byte for NULL terminator
+	 */
+	len++;
+	/*
+	 * If there is ISID present with the registration, use format code:
+	 * 01b: iSCSI Initiator port TransportID format
+	 *
+	 * If there is not an active iSCSI session, use format code:
+	 * 00b: iSCSI Initiator device TransportID format
+	 */
+	if (pr_reg->isid_present_at_reg) {
+		len += 5; /* For ",i,0x" ASCII seperator */
+		len += 7; /* For iSCSI Initiator Session ID + Null terminator */
+		*format_code = 1;
+	} else
+		*format_code = 0;
+	spin_unlock_irq(&se_nacl->nacl_sess_lock);
+	/*
+	 * The ADDITIONAL LENGTH field specifies the number of bytes that follow
+	 * in the TransportID. The additional length shall be at least 20 and
+	 * shall be a multiple of four.
+	 */
+	padding = ((-len) & 3);
+	if (padding != 0)
+		len += padding;
+	/*
+	 * Increment value for total payload + header length for
+	 * full status descriptor
+	 */
+	len += 4;
+
+	return len;
+}
+EXPORT_SYMBOL(iscsi_get_pr_transport_id_len);
+
+char *iscsi_parse_pr_out_transport_id(
+	struct se_portal_group *se_tpg,
+	const char *buf,
+	u32 *out_tid_len,
+	char **port_nexus_ptr)
+{
+	char *p;
+	u32 tid_len, padding;
+	int i;
+	u16 add_len;
+	u8 format_code = (buf[0] & 0xc0);
+	/*
+	 * Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
+	 *
+	 *       TransportID for initiator ports using SCSI over iSCSI,
+	 *       from Table 388 -- iSCSI TransportID formats.
+	 *
+	 *    00b     Initiator port is identified using the world wide unique
+	 *            SCSI device name of the iSCSI initiator
+	 *            device containing the initiator port (see table 389).
+	 *    01b     Initiator port is identified using the world wide unique
+	 *            initiator port identifier (see table 390).10b to 11b
+	 *            Reserved
+	 */
+	if ((format_code != 0x00) && (format_code != 0x40)) {
+		printk(KERN_ERR "Illegal format code: 0x%02x for iSCSI"
+			" Initiator Transport ID\n", format_code);
+		return NULL;
+	}
+	/*
+	 * If the caller wants the TransportID Length, we set that value for the
+	 * entire iSCSI Tarnsport ID now.
+	 */
+	 if (out_tid_len != NULL) {
+		add_len = ((buf[2] >> 8) & 0xff);
+		add_len |= (buf[3] & 0xff);
+
+		tid_len = strlen((char *)&buf[4]);
+		tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
+		tid_len += 1; /* Add one byte for NULL terminator */
+		padding = ((-tid_len) & 3);
+		if (padding != 0)
+			tid_len += padding;
+
+		if ((add_len + 4) != tid_len) {
+			printk(KERN_INFO "LIO-Target Extracted add_len: %hu "
+				"does not match calculated tid_len: %u,"
+				" using tid_len instead\n", add_len+4, tid_len);
+			*out_tid_len = tid_len;
+		} else
+			*out_tid_len = (add_len + 4);
+	}
+	/*
+	 * Check for ',i,0x' seperator between iSCSI Name and iSCSI Initiator
+	 * Session ID as defined in Table 390 - iSCSI initiator port TransportID
+	 * format.
+	 */
+	if (format_code == 0x40) {
+		p = strstr((char *)&buf[4], ",i,0x");
+		if (!(p)) {
+			printk(KERN_ERR "Unable to locate \",i,0x\" seperator"
+				" for Initiator port identifier: %s\n",
+				(char *)&buf[4]);
+			return NULL;
+		}
+		*p = '\0'; /* Terminate iSCSI Name */
+		p += 5; /* Skip over ",i,0x" seperator */
+
+		*port_nexus_ptr = p;
+		/*
+		 * Go ahead and do the lower case conversion of the received
+		 * 12 ASCII characters representing the ISID in the TransportID
+		 * for comparision against the running iSCSI session's ISID from
+		 * iscsi_target.c:lio_sess_get_initiator_sid()
+		 */
+		for (i = 0; i < 12; i++) {
+			if (isdigit(*p)) {
+				p++;
+				continue;
+			}
+			*p = tolower(*p);
+			p++;
+		}
+	}
+
+	return (char *)&buf[4];
+}
+EXPORT_SYMBOL(iscsi_parse_pr_out_transport_id);
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
new file mode 100644
index 0000000..0aaca88
--- /dev/null
+++ b/drivers/target/target_core_file.c
@@ -0,0 +1,688 @@
+/*******************************************************************************
+ * Filename:  target_core_file.c
+ *
+ * This file contains the Storage Engine <-> FILEIO transport specific functions
+ *
+ * Copyright (c) 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/timer.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_file.h"
+
+#if 1
+#define DEBUG_FD_CACHE(x...) printk(x)
+#else
+#define DEBUG_FD_CACHE(x...)
+#endif
+
+#if 1
+#define DEBUG_FD_FUA(x...) printk(x)
+#else
+#define DEBUG_FD_FUA(x...)
+#endif
+
+static struct se_subsystem_api fileio_template;
+
+/*	fd_attach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int fd_attach_hba(struct se_hba *hba, u32 host_id)
+{
+	struct fd_host *fd_host;
+
+	fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
+	if (!(fd_host)) {
+		printk(KERN_ERR "Unable to allocate memory for struct fd_host\n");
+		return -1;
+	}
+
+	fd_host->fd_host_id = host_id;
+
+	atomic_set(&hba->left_queue_depth, FD_HBA_QUEUE_DEPTH);
+	atomic_set(&hba->max_queue_depth, FD_HBA_QUEUE_DEPTH);
+	hba->hba_ptr = (void *) fd_host;
+
+	printk(KERN_INFO "CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
+		" Target Core Stack %s\n", hba->hba_id, FD_VERSION,
+		TARGET_CORE_MOD_VERSION);
+	printk(KERN_INFO "CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic"
+		" Target Core with TCQ Depth: %d MaxSectors: %u\n",
+		hba->hba_id, fd_host->fd_host_id,
+		atomic_read(&hba->max_queue_depth), FD_MAX_SECTORS);
+
+	return 0;
+}
+
+static void fd_detach_hba(struct se_hba *hba)
+{
+	struct fd_host *fd_host = hba->hba_ptr;
+
+	printk(KERN_INFO "CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
+		" Target Core\n", hba->hba_id, fd_host->fd_host_id);
+
+	kfree(fd_host);
+	hba->hba_ptr = NULL;
+}
+
+static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name)
+{
+	struct fd_dev *fd_dev;
+	struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr;
+
+	fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
+	if (!(fd_dev)) {
+		printk(KERN_ERR "Unable to allocate memory for struct fd_dev\n");
+		return NULL;
+	}
+
+	fd_dev->fd_host = fd_host;
+
+	printk(KERN_INFO "FILEIO: Allocated fd_dev for %p\n", name);
+
+	return fd_dev;
+}
+
+/*	fd_create_virtdevice(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static struct se_device *fd_create_virtdevice(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	void *p)
+{
+	char *dev_p = NULL;
+	struct se_device *dev;
+	struct se_dev_limits dev_limits;
+	struct queue_limits *limits;
+	struct fd_dev *fd_dev = (struct fd_dev *) p;
+	struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr;
+	mm_segment_t old_fs;
+	struct file *file;
+	struct inode *inode = NULL;
+	int dev_flags = 0, flags;
+
+	memset(&dev_limits, 0, sizeof(struct se_dev_limits));
+
+	old_fs = get_fs();
+	set_fs(get_ds());
+	dev_p = getname(fd_dev->fd_dev_name);
+	set_fs(old_fs);
+
+	if (IS_ERR(dev_p)) {
+		printk(KERN_ERR "getname(%s) failed: %lu\n",
+			fd_dev->fd_dev_name, IS_ERR(dev_p));
+		goto fail;
+	}
+#if 0
+	if (di->no_create_file)
+		flags = O_RDWR | O_LARGEFILE;
+	else
+		flags = O_RDWR | O_CREAT | O_LARGEFILE;
+#else
+	flags = O_RDWR | O_CREAT | O_LARGEFILE;
+#endif
+/*	flags |= O_DIRECT; */
+	/*
+	 * If fd_buffered_io=1 has not been set explictly (the default),
+	 * use O_SYNC to force FILEIO writes to disk.
+	 */
+	if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO))
+		flags |= O_SYNC;
+
+	file = filp_open(dev_p, flags, 0600);
+
+	if (IS_ERR(file) || !file || !file->f_dentry) {
+		printk(KERN_ERR "filp_open(%s) failed\n", dev_p);
+		goto fail;
+	}
+	fd_dev->fd_file = file;
+	/*
+	 * If using a block backend with this struct file, we extract
+	 * fd_dev->fd_[block,dev]_size from struct block_device.
+	 *
+	 * Otherwise, we use the passed fd_size= from configfs
+	 */
+	inode = file->f_mapping->host;
+	if (S_ISBLK(inode->i_mode)) {
+		struct request_queue *q;
+		/*
+		 * Setup the local scope queue_limits from struct request_queue->limits
+		 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
+		 */
+		q = bdev_get_queue(inode->i_bdev);
+		limits = &dev_limits.limits;
+		limits->logical_block_size = bdev_logical_block_size(inode->i_bdev);
+		limits->max_hw_sectors = queue_max_hw_sectors(q);
+		limits->max_sectors = queue_max_sectors(q);
+		/*
+		 * Determine the number of bytes from i_size_read() minus
+		 * one (1) logical sector from underlying struct block_device
+		 */
+		fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
+		fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) -
+				       fd_dev->fd_block_size);
+
+		printk(KERN_INFO "FILEIO: Using size: %llu bytes from struct"
+			" block_device blocks: %llu logical_block_size: %d\n",
+			fd_dev->fd_dev_size,
+			div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size),
+			fd_dev->fd_block_size);
+	} else {
+		if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
+			printk(KERN_ERR "FILEIO: Missing fd_dev_size="
+				" parameter, and no backing struct"
+				" block_device\n");
+			goto fail;
+		}
+
+		limits = &dev_limits.limits;
+		limits->logical_block_size = FD_BLOCKSIZE;
+		limits->max_hw_sectors = FD_MAX_SECTORS;
+		limits->max_sectors = FD_MAX_SECTORS;
+		fd_dev->fd_block_size = FD_BLOCKSIZE;
+	}
+
+	dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
+	dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
+
+	dev = transport_add_device_to_core_hba(hba, &fileio_template,
+				se_dev, dev_flags, (void *)fd_dev,
+				&dev_limits, "FILEIO", FD_VERSION);
+	if (!(dev))
+		goto fail;
+
+	fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
+	fd_dev->fd_queue_depth = dev->queue_depth;
+
+	printk(KERN_INFO "CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
+		" %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
+			fd_dev->fd_dev_name, fd_dev->fd_dev_size);
+
+	putname(dev_p);
+	return dev;
+fail:
+	if (fd_dev->fd_file) {
+		filp_close(fd_dev->fd_file, NULL);
+		fd_dev->fd_file = NULL;
+	}
+	putname(dev_p);
+	return NULL;
+}
+
+/*	fd_free_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void fd_free_device(void *p)
+{
+	struct fd_dev *fd_dev = (struct fd_dev *) p;
+
+	if (fd_dev->fd_file) {
+		filp_close(fd_dev->fd_file, NULL);
+		fd_dev->fd_file = NULL;
+	}
+
+	kfree(fd_dev);
+}
+
+static inline struct fd_request *FILE_REQ(struct se_task *task)
+{
+	return container_of(task, struct fd_request, fd_task);
+}
+
+
+static struct se_task *
+fd_alloc_task(struct se_cmd *cmd)
+{
+	struct fd_request *fd_req;
+
+	fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL);
+	if (!(fd_req)) {
+		printk(KERN_ERR "Unable to allocate struct fd_request\n");
+		return NULL;
+	}
+
+	fd_req->fd_dev = SE_DEV(cmd)->dev_ptr;
+
+	return &fd_req->fd_task;
+}
+
+static int fd_do_readv(struct se_task *task)
+{
+	struct fd_request *req = FILE_REQ(task);
+	struct file *fd = req->fd_dev->fd_file;
+	struct scatterlist *sg = task->task_sg;
+	struct iovec *iov;
+	mm_segment_t old_fs;
+	loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size);
+	int ret = 0, i;
+
+	iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL);
+	if (!(iov)) {
+		printk(KERN_ERR "Unable to allocate fd_do_readv iov[]\n");
+		return -1;
+	}
+
+	for (i = 0; i < task->task_sg_num; i++) {
+		iov[i].iov_len = sg[i].length;
+		iov[i].iov_base = sg_virt(&sg[i]);
+	}
+
+	old_fs = get_fs();
+	set_fs(get_ds());
+	ret = vfs_readv(fd, &iov[0], task->task_sg_num, &pos);
+	set_fs(old_fs);
+
+	kfree(iov);
+	/*
+	 * Return zeros and GOOD status even if the READ did not return
+	 * the expected virt_size for struct file w/o a backing struct
+	 * block_device.
+	 */
+	if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
+		if (ret < 0 || ret != task->task_size) {
+			printk(KERN_ERR "vfs_readv() returned %d,"
+				" expecting %d for S_ISBLK\n", ret,
+				(int)task->task_size);
+			return -1;
+		}
+	} else {
+		if (ret < 0) {
+			printk(KERN_ERR "vfs_readv() returned %d for non"
+				" S_ISBLK\n", ret);
+			return -1;
+		}
+	}
+
+	return 1;
+}
+
+static int fd_do_writev(struct se_task *task)
+{
+	struct fd_request *req = FILE_REQ(task);
+	struct file *fd = req->fd_dev->fd_file;
+	struct scatterlist *sg = task->task_sg;
+	struct iovec *iov;
+	mm_segment_t old_fs;
+	loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size);
+	int ret, i = 0;
+
+	iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL);
+	if (!(iov)) {
+		printk(KERN_ERR "Unable to allocate fd_do_writev iov[]\n");
+		return -1;
+	}
+
+	for (i = 0; i < task->task_sg_num; i++) {
+		iov[i].iov_len = sg[i].length;
+		iov[i].iov_base = sg_virt(&sg[i]);
+	}
+
+	old_fs = get_fs();
+	set_fs(get_ds());
+	ret = vfs_writev(fd, &iov[0], task->task_sg_num, &pos);
+	set_fs(old_fs);
+
+	kfree(iov);
+
+	if (ret < 0 || ret != task->task_size) {
+		printk(KERN_ERR "vfs_writev() returned %d\n", ret);
+		return -1;
+	}
+
+	return 1;
+}
+
+static void fd_emulate_sync_cache(struct se_task *task)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+	struct se_device *dev = cmd->se_dev;
+	struct fd_dev *fd_dev = dev->dev_ptr;
+	int immed = (cmd->t_task->t_task_cdb[1] & 0x2);
+	loff_t start, end;
+	int ret;
+
+	/*
+	 * If the Immediate bit is set, queue up the GOOD response
+	 * for this SYNCHRONIZE_CACHE op
+	 */
+	if (immed)
+		transport_complete_sync_cache(cmd, 1);
+
+	/*
+	 * Determine if we will be flushing the entire device.
+	 */
+	if (cmd->t_task->t_task_lba == 0 && cmd->data_length == 0) {
+		start = 0;
+		end = LLONG_MAX;
+	} else {
+		start = cmd->t_task->t_task_lba * DEV_ATTRIB(dev)->block_size;
+		if (cmd->data_length)
+			end = start + cmd->data_length;
+		else
+			end = LLONG_MAX;
+	}
+
+	ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
+	if (ret != 0)
+		printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret);
+
+	if (!immed)
+		transport_complete_sync_cache(cmd, ret == 0);
+}
+
+/*
+ * Tell TCM Core that we are capable of WriteCache emulation for
+ * an underlying struct se_device.
+ */
+static int fd_emulated_write_cache(struct se_device *dev)
+{
+	return 1;
+}
+
+static int fd_emulated_dpo(struct se_device *dev)
+{
+	return 0;
+}
+/*
+ * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs
+ * for TYPE_DISK.
+ */
+static int fd_emulated_fua_write(struct se_device *dev)
+{
+	return 1;
+}
+
+static int fd_emulated_fua_read(struct se_device *dev)
+{
+	return 0;
+}
+
+/*
+ * WRITE Force Unit Access (FUA) emulation on a per struct se_task
+ * LBA range basis..
+ */
+static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct fd_dev *fd_dev = dev->dev_ptr;
+	loff_t start = task->task_lba * DEV_ATTRIB(dev)->block_size;
+	loff_t end = start + task->task_size;
+	int ret;
+
+	DEBUG_FD_CACHE("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n",
+			task->task_lba, task->task_size);
+
+	ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
+	if (ret != 0)
+		printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret);
+}
+
+static int fd_do_task(struct se_task *task)
+{
+	struct se_cmd *cmd = task->task_se_cmd;
+	struct se_device *dev = cmd->se_dev;
+	int ret = 0;
+
+	/*
+	 * Call vectorized fileio functions to map struct scatterlist
+	 * physical memory addresses to struct iovec virtual memory.
+	 */
+	if (task->task_data_direction == DMA_FROM_DEVICE) {
+		ret = fd_do_readv(task);
+	} else {
+		ret = fd_do_writev(task);
+
+		if (ret > 0 &&
+		    DEV_ATTRIB(dev)->emulate_write_cache > 0 &&
+		    DEV_ATTRIB(dev)->emulate_fua_write > 0 &&
+		    T_TASK(cmd)->t_tasks_fua) {
+			/*
+			 * We might need to be a bit smarter here
+			 * and return some sense data to let the initiator
+			 * know the FUA WRITE cache sync failed..?
+			 */
+			fd_emulate_write_fua(cmd, task);
+		}
+
+	}
+
+	if (ret < 0)
+		return ret;
+	if (ret) {
+		task->task_scsi_status = GOOD;
+		transport_complete_task(task, 1);
+	}
+	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+/*	fd_free_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void fd_free_task(struct se_task *task)
+{
+	struct fd_request *req = FILE_REQ(task);
+
+	kfree(req);
+}
+
+enum {
+	Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_fd_dev_name, "fd_dev_name=%s"},
+	{Opt_fd_dev_size, "fd_dev_size=%s"},
+	{Opt_fd_buffered_io, "fd_buffered_id=%d"},
+	{Opt_err, NULL}
+};
+
+static ssize_t fd_set_configfs_dev_params(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	const char *page, ssize_t count)
+{
+	struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
+	char *orig, *ptr, *arg_p, *opts;
+	substring_t args[MAX_OPT_ARGS];
+	int ret = 0, arg, token;
+
+	opts = kstrdup(page, GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	orig = opts;
+
+	while ((ptr = strsep(&opts, ",")) != NULL) {
+		if (!*ptr)
+			continue;
+
+		token = match_token(ptr, tokens, args);
+		switch (token) {
+		case Opt_fd_dev_name:
+			snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME,
+					"%s", match_strdup(&args[0]));
+			printk(KERN_INFO "FILEIO: Referencing Path: %s\n",
+					fd_dev->fd_dev_name);
+			fd_dev->fbd_flags |= FBDF_HAS_PATH;
+			break;
+		case Opt_fd_dev_size:
+			arg_p = match_strdup(&args[0]);
+			ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
+			if (ret < 0) {
+				printk(KERN_ERR "strict_strtoull() failed for"
+						" fd_dev_size=\n");
+				goto out;
+			}
+			printk(KERN_INFO "FILEIO: Referencing Size: %llu"
+					" bytes\n", fd_dev->fd_dev_size);
+			fd_dev->fbd_flags |= FBDF_HAS_SIZE;
+			break;
+		case Opt_fd_buffered_io:
+			match_int(args, &arg);
+			if (arg != 1) {
+				printk(KERN_ERR "bogus fd_buffered_io=%d value\n", arg);
+				ret = -EINVAL;
+				goto out;
+			}
+
+			printk(KERN_INFO "FILEIO: Using buffered I/O"
+				" operations for struct fd_dev\n");
+
+			fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO;
+			break;
+		default:
+			break;
+		}
+	}
+
+out:
+	kfree(orig);
+	return (!ret) ? count : ret;
+}
+
+static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
+{
+	struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr;
+
+	if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
+		printk(KERN_ERR "Missing fd_dev_name=\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static ssize_t fd_show_configfs_dev_params(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	char *b)
+{
+	struct fd_dev *fd_dev = se_dev->se_dev_su_ptr;
+	ssize_t bl = 0;
+
+	bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
+	bl += sprintf(b + bl, "        File: %s  Size: %llu  Mode: %s\n",
+		fd_dev->fd_dev_name, fd_dev->fd_dev_size,
+		(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ?
+		"Buffered" : "Synchronous");
+	return bl;
+}
+
+/*	fd_get_cdb(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static unsigned char *fd_get_cdb(struct se_task *task)
+{
+	struct fd_request *req = FILE_REQ(task);
+
+	return req->fd_scsi_cdb;
+}
+
+/*	fd_get_device_rev(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static u32 fd_get_device_rev(struct se_device *dev)
+{
+	return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
+}
+
+/*	fd_get_device_type(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static u32 fd_get_device_type(struct se_device *dev)
+{
+	return TYPE_DISK;
+}
+
+static sector_t fd_get_blocks(struct se_device *dev)
+{
+	struct fd_dev *fd_dev = dev->dev_ptr;
+	unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size,
+			DEV_ATTRIB(dev)->block_size);
+
+	return blocks_long;
+}
+
+static struct se_subsystem_api fileio_template = {
+	.name			= "fileio",
+	.owner			= THIS_MODULE,
+	.transport_type		= TRANSPORT_PLUGIN_VHBA_PDEV,
+	.attach_hba		= fd_attach_hba,
+	.detach_hba		= fd_detach_hba,
+	.allocate_virtdevice	= fd_allocate_virtdevice,
+	.create_virtdevice	= fd_create_virtdevice,
+	.free_device		= fd_free_device,
+	.dpo_emulated		= fd_emulated_dpo,
+	.fua_write_emulated	= fd_emulated_fua_write,
+	.fua_read_emulated	= fd_emulated_fua_read,
+	.write_cache_emulated	= fd_emulated_write_cache,
+	.alloc_task		= fd_alloc_task,
+	.do_task		= fd_do_task,
+	.do_sync_cache		= fd_emulate_sync_cache,
+	.free_task		= fd_free_task,
+	.check_configfs_dev_params = fd_check_configfs_dev_params,
+	.set_configfs_dev_params = fd_set_configfs_dev_params,
+	.show_configfs_dev_params = fd_show_configfs_dev_params,
+	.get_cdb		= fd_get_cdb,
+	.get_device_rev		= fd_get_device_rev,
+	.get_device_type	= fd_get_device_type,
+	.get_blocks		= fd_get_blocks,
+};
+
+static int __init fileio_module_init(void)
+{
+	return transport_subsystem_register(&fileio_template);
+}
+
+static void fileio_module_exit(void)
+{
+	transport_subsystem_release(&fileio_template);
+}
+
+MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
+MODULE_AUTHOR("nab@Linux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(fileio_module_init);
+module_exit(fileio_module_exit);
diff --git a/drivers/target/target_core_file.h b/drivers/target/target_core_file.h
new file mode 100644
index 0000000..ef4de2b
--- /dev/null
+++ b/drivers/target/target_core_file.h
@@ -0,0 +1,50 @@
+#ifndef TARGET_CORE_FILE_H
+#define TARGET_CORE_FILE_H
+
+#define FD_VERSION		"4.0"
+
+#define FD_MAX_DEV_NAME		256
+/* Maximum queuedepth for the FILEIO HBA */
+#define FD_HBA_QUEUE_DEPTH	256
+#define FD_DEVICE_QUEUE_DEPTH	32
+#define FD_MAX_DEVICE_QUEUE_DEPTH 128
+#define FD_BLOCKSIZE		512
+#define FD_MAX_SECTORS		1024
+
+#define RRF_EMULATE_CDB		0x01
+#define RRF_GOT_LBA		0x02
+
+struct fd_request {
+	struct se_task	fd_task;
+	/* SCSI CDB from iSCSI Command PDU */
+	unsigned char	fd_scsi_cdb[TCM_MAX_COMMAND_SIZE];
+	/* FILEIO device */
+	struct fd_dev	*fd_dev;
+} ____cacheline_aligned;
+
+#define FBDF_HAS_PATH		0x01
+#define FBDF_HAS_SIZE		0x02
+#define FDBD_USE_BUFFERED_IO	0x04
+
+struct fd_dev {
+	u32		fbd_flags;
+	unsigned char	fd_dev_name[FD_MAX_DEV_NAME];
+	/* Unique Ramdisk Device ID in Ramdisk HBA */
+	u32		fd_dev_id;
+	/* Number of SG tables in sg_table_array */
+	u32		fd_table_count;
+	u32		fd_queue_depth;
+	u32		fd_block_size;
+	unsigned long long fd_dev_size;
+	struct file	*fd_file;
+	/* FILEIO HBA device is connected to */
+	struct fd_host *fd_host;
+} ____cacheline_aligned;
+
+struct fd_host {
+	u32		fd_host_dev_id_count;
+	/* Unique FILEIO Host ID */
+	u32		fd_host_id;
+} ____cacheline_aligned;
+
+#endif /* TARGET_CORE_FILE_H */
diff --git a/drivers/target/target_core_hba.c b/drivers/target/target_core_hba.c
new file mode 100644
index 0000000..4bbe820
--- /dev/null
+++ b/drivers/target/target_core_hba.c
@@ -0,0 +1,185 @@
+/*******************************************************************************
+ * Filename:  target_core_hba.c
+ *
+ * This file copntains the iSCSI HBA Transport related functions.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/in.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_hba.h"
+
+static LIST_HEAD(subsystem_list);
+static DEFINE_MUTEX(subsystem_mutex);
+
+int transport_subsystem_register(struct se_subsystem_api *sub_api)
+{
+	struct se_subsystem_api *s;
+
+	INIT_LIST_HEAD(&sub_api->sub_api_list);
+
+	mutex_lock(&subsystem_mutex);
+	list_for_each_entry(s, &subsystem_list, sub_api_list) {
+		if (!(strcmp(s->name, sub_api->name))) {
+			printk(KERN_ERR "%p is already registered with"
+				" duplicate name %s, unable to process"
+				" request\n", s, s->name);
+			mutex_unlock(&subsystem_mutex);
+			return -EEXIST;
+		}
+	}
+	list_add_tail(&sub_api->sub_api_list, &subsystem_list);
+	mutex_unlock(&subsystem_mutex);
+
+	printk(KERN_INFO "TCM: Registered subsystem plugin: %s struct module:"
+			" %p\n", sub_api->name, sub_api->owner);
+	return 0;
+}
+EXPORT_SYMBOL(transport_subsystem_register);
+
+void transport_subsystem_release(struct se_subsystem_api *sub_api)
+{
+	mutex_lock(&subsystem_mutex);
+	list_del(&sub_api->sub_api_list);
+	mutex_unlock(&subsystem_mutex);
+}
+EXPORT_SYMBOL(transport_subsystem_release);
+
+static struct se_subsystem_api *core_get_backend(const char *sub_name)
+{
+	struct se_subsystem_api *s;
+
+	mutex_lock(&subsystem_mutex);
+	list_for_each_entry(s, &subsystem_list, sub_api_list) {
+		if (!strcmp(s->name, sub_name))
+			goto found;
+	}
+	mutex_unlock(&subsystem_mutex);
+	return NULL;
+found:
+	if (s->owner && !try_module_get(s->owner))
+		s = NULL;
+	mutex_unlock(&subsystem_mutex);
+	return s;
+}
+
+struct se_hba *
+core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags)
+{
+	struct se_hba *hba;
+	int ret = 0;
+
+	hba = kzalloc(sizeof(*hba), GFP_KERNEL);
+	if (!hba) {
+		printk(KERN_ERR "Unable to allocate struct se_hba\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	INIT_LIST_HEAD(&hba->hba_dev_list);
+	spin_lock_init(&hba->device_lock);
+	spin_lock_init(&hba->hba_queue_lock);
+	mutex_init(&hba->hba_access_mutex);
+
+	hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX);
+	hba->hba_flags |= hba_flags;
+
+	atomic_set(&hba->max_queue_depth, 0);
+	atomic_set(&hba->left_queue_depth, 0);
+
+	hba->transport = core_get_backend(plugin_name);
+	if (!hba->transport) {
+		ret = -EINVAL;
+		goto out_free_hba;
+	}
+
+	ret = hba->transport->attach_hba(hba, plugin_dep_id);
+	if (ret < 0)
+		goto out_module_put;
+
+	spin_lock(&se_global->hba_lock);
+	hba->hba_id = se_global->g_hba_id_counter++;
+	list_add_tail(&hba->hba_list, &se_global->g_hba_list);
+	spin_unlock(&se_global->hba_lock);
+
+	printk(KERN_INFO "CORE_HBA[%d] - Attached HBA to Generic Target"
+			" Core\n", hba->hba_id);
+
+	return hba;
+
+out_module_put:
+	if (hba->transport->owner)
+		module_put(hba->transport->owner);
+	hba->transport = NULL;
+out_free_hba:
+	kfree(hba);
+	return ERR_PTR(ret);
+}
+
+int
+core_delete_hba(struct se_hba *hba)
+{
+	struct se_device *dev, *dev_tmp;
+
+	spin_lock(&hba->device_lock);
+	list_for_each_entry_safe(dev, dev_tmp, &hba->hba_dev_list, dev_list) {
+
+		se_clear_dev_ports(dev);
+		spin_unlock(&hba->device_lock);
+
+		se_release_device_for_hba(dev);
+
+		spin_lock(&hba->device_lock);
+	}
+	spin_unlock(&hba->device_lock);
+
+	hba->transport->detach_hba(hba);
+
+	spin_lock(&se_global->hba_lock);
+	list_del(&hba->hba_list);
+	spin_unlock(&se_global->hba_lock);
+
+	printk(KERN_INFO "CORE_HBA[%d] - Detached HBA from Generic Target"
+			" Core\n", hba->hba_id);
+
+	if (hba->transport->owner)
+		module_put(hba->transport->owner);
+
+	hba->transport = NULL;
+	kfree(hba);
+	return 0;
+}
diff --git a/drivers/target/target_core_hba.h b/drivers/target/target_core_hba.h
new file mode 100644
index 0000000..bb0fea5
--- /dev/null
+++ b/drivers/target/target_core_hba.h
@@ -0,0 +1,7 @@
+#ifndef TARGET_CORE_HBA_H
+#define TARGET_CORE_HBA_H
+
+extern struct se_hba *core_alloc_hba(const char *, u32, u32);
+extern int core_delete_hba(struct se_hba *);
+
+#endif /* TARGET_CORE_HBA_H */
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
new file mode 100644
index 0000000..c6e0d75
--- /dev/null
+++ b/drivers/target/target_core_iblock.c
@@ -0,0 +1,808 @@
+/*******************************************************************************
+ * Filename:  target_core_iblock.c
+ *
+ * This file contains the Storage Engine  <-> Linux BlockIO transport
+ * specific functions.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/timer.h>
+#include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/bio.h>
+#include <linux/genhd.h>
+#include <linux/file.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_iblock.h"
+
+#if 0
+#define DEBUG_IBLOCK(x...) printk(x)
+#else
+#define DEBUG_IBLOCK(x...)
+#endif
+
+static struct se_subsystem_api iblock_template;
+
+static void iblock_bio_done(struct bio *, int);
+
+/*	iblock_attach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
+{
+	struct iblock_hba *ib_host;
+
+	ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL);
+	if (!(ib_host)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+				" struct iblock_hba\n");
+		return -ENOMEM;
+	}
+
+	ib_host->iblock_host_id = host_id;
+
+	atomic_set(&hba->left_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
+	atomic_set(&hba->max_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
+	hba->hba_ptr = (void *) ib_host;
+
+	printk(KERN_INFO "CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
+		" Generic Target Core Stack %s\n", hba->hba_id,
+		IBLOCK_VERSION, TARGET_CORE_MOD_VERSION);
+
+	printk(KERN_INFO "CORE_HBA[%d] - Attached iBlock HBA: %u to Generic"
+		" Target Core TCQ Depth: %d\n", hba->hba_id,
+		ib_host->iblock_host_id, atomic_read(&hba->max_queue_depth));
+
+	return 0;
+}
+
+static void iblock_detach_hba(struct se_hba *hba)
+{
+	struct iblock_hba *ib_host = hba->hba_ptr;
+
+	printk(KERN_INFO "CORE_HBA[%d] - Detached iBlock HBA: %u from Generic"
+		" Target Core\n", hba->hba_id, ib_host->iblock_host_id);
+
+	kfree(ib_host);
+	hba->hba_ptr = NULL;
+}
+
+static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name)
+{
+	struct iblock_dev *ib_dev = NULL;
+	struct iblock_hba *ib_host = hba->hba_ptr;
+
+	ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
+	if (!(ib_dev)) {
+		printk(KERN_ERR "Unable to allocate struct iblock_dev\n");
+		return NULL;
+	}
+	ib_dev->ibd_host = ib_host;
+
+	printk(KERN_INFO  "IBLOCK: Allocated ib_dev for %s\n", name);
+
+	return ib_dev;
+}
+
+static struct se_device *iblock_create_virtdevice(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	void *p)
+{
+	struct iblock_dev *ib_dev = p;
+	struct se_device *dev;
+	struct se_dev_limits dev_limits;
+	struct block_device *bd = NULL;
+	struct request_queue *q;
+	struct queue_limits *limits;
+	u32 dev_flags = 0;
+
+	if (!(ib_dev)) {
+		printk(KERN_ERR "Unable to locate struct iblock_dev parameter\n");
+		return 0;
+	}
+	memset(&dev_limits, 0, sizeof(struct se_dev_limits));
+	/*
+	 * These settings need to be made tunable..
+	 */
+	ib_dev->ibd_bio_set = bioset_create(32, 64);
+	if (!(ib_dev->ibd_bio_set)) {
+		printk(KERN_ERR "IBLOCK: Unable to create bioset()\n");
+		return 0;
+	}
+	printk(KERN_INFO "IBLOCK: Created bio_set()\n");
+	/*
+	 * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path
+	 * must already have been set in order for echo 1 > $HBA/$DEV/enable to run.
+	 */
+	printk(KERN_INFO  "IBLOCK: Claiming struct block_device: %s\n",
+			ib_dev->ibd_udev_path);
+
+	bd = blkdev_get_by_path(ib_dev->ibd_udev_path,
+				FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev);
+	if (!(bd))
+		goto failed;
+	/*
+	 * Setup the local scope queue_limits from struct request_queue->limits
+	 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
+	 */
+	q = bdev_get_queue(bd);
+	limits = &dev_limits.limits;
+	limits->logical_block_size = bdev_logical_block_size(bd);
+	limits->max_hw_sectors = queue_max_hw_sectors(q);
+	limits->max_sectors = queue_max_sectors(q);
+	dev_limits.hw_queue_depth = IBLOCK_MAX_DEVICE_QUEUE_DEPTH;
+	dev_limits.queue_depth = IBLOCK_DEVICE_QUEUE_DEPTH;
+
+	ib_dev->ibd_major = MAJOR(bd->bd_dev);
+	ib_dev->ibd_minor = MINOR(bd->bd_dev);
+	ib_dev->ibd_bd = bd;
+
+	dev = transport_add_device_to_core_hba(hba,
+			&iblock_template, se_dev, dev_flags, (void *)ib_dev,
+			&dev_limits, "IBLOCK", IBLOCK_VERSION);
+	if (!(dev))
+		goto failed;
+
+	ib_dev->ibd_depth = dev->queue_depth;
+
+	/*
+	 * Check if the underlying struct block_device request_queue supports
+	 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
+	 * in ATA and we need to set TPE=1
+	 */
+	if (blk_queue_discard(bdev_get_queue(bd))) {
+		struct request_queue *q = bdev_get_queue(bd);
+
+		DEV_ATTRIB(dev)->max_unmap_lba_count =
+				q->limits.max_discard_sectors;
+		/*
+		 * Currently hardcoded to 1 in Linux/SCSI code..
+		 */
+		DEV_ATTRIB(dev)->max_unmap_block_desc_count = 1;
+		DEV_ATTRIB(dev)->unmap_granularity =
+				q->limits.discard_granularity;
+		DEV_ATTRIB(dev)->unmap_granularity_alignment =
+				q->limits.discard_alignment;
+
+		printk(KERN_INFO "IBLOCK: BLOCK Discard support available,"
+				" disabled by default\n");
+	}
+
+	return dev;
+
+failed:
+	if (ib_dev->ibd_bio_set) {
+		bioset_free(ib_dev->ibd_bio_set);
+		ib_dev->ibd_bio_set = NULL;
+	}
+	ib_dev->ibd_bd = NULL;
+	ib_dev->ibd_major = 0;
+	ib_dev->ibd_minor = 0;
+	return NULL;
+}
+
+static void iblock_free_device(void *p)
+{
+	struct iblock_dev *ib_dev = p;
+
+	blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
+	bioset_free(ib_dev->ibd_bio_set);
+	kfree(ib_dev);
+}
+
+static inline struct iblock_req *IBLOCK_REQ(struct se_task *task)
+{
+	return container_of(task, struct iblock_req, ib_task);
+}
+
+static struct se_task *
+iblock_alloc_task(struct se_cmd *cmd)
+{
+	struct iblock_req *ib_req;
+
+	ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
+	if (!(ib_req)) {
+		printk(KERN_ERR "Unable to allocate memory for struct iblock_req\n");
+		return NULL;
+	}
+
+	ib_req->ib_dev = SE_DEV(cmd)->dev_ptr;
+	atomic_set(&ib_req->ib_bio_cnt, 0);
+	return &ib_req->ib_task;
+}
+
+static unsigned long long iblock_emulate_read_cap_with_block_size(
+	struct se_device *dev,
+	struct block_device *bd,
+	struct request_queue *q)
+{
+	unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
+					bdev_logical_block_size(bd)) - 1);
+	u32 block_size = bdev_logical_block_size(bd);
+
+	if (block_size == DEV_ATTRIB(dev)->block_size)
+		return blocks_long;
+
+	switch (block_size) {
+	case 4096:
+		switch (DEV_ATTRIB(dev)->block_size) {
+		case 2048:
+			blocks_long <<= 1;
+			break;
+		case 1024:
+			blocks_long <<= 2;
+			break;
+		case 512:
+			blocks_long <<= 3;
+		default:
+			break;
+		}
+		break;
+	case 2048:
+		switch (DEV_ATTRIB(dev)->block_size) {
+		case 4096:
+			blocks_long >>= 1;
+			break;
+		case 1024:
+			blocks_long <<= 1;
+			break;
+		case 512:
+			blocks_long <<= 2;
+			break;
+		default:
+			break;
+		}
+		break;
+	case 1024:
+		switch (DEV_ATTRIB(dev)->block_size) {
+		case 4096:
+			blocks_long >>= 2;
+			break;
+		case 2048:
+			blocks_long >>= 1;
+			break;
+		case 512:
+			blocks_long <<= 1;
+			break;
+		default:
+			break;
+		}
+		break;
+	case 512:
+		switch (DEV_ATTRIB(dev)->block_size) {
+		case 4096:
+			blocks_long >>= 3;
+			break;
+		case 2048:
+			blocks_long >>= 2;
+			break;
+		case 1024:
+			blocks_long >>= 1;
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return blocks_long;
+}
+
+/*
+ * Emulate SYCHRONIZE_CACHE_*
+ */
+static void iblock_emulate_sync_cache(struct se_task *task)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+	struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
+	int immed = (T_TASK(cmd)->t_task_cdb[1] & 0x2);
+	sector_t error_sector;
+	int ret;
+
+	/*
+	 * If the Immediate bit is set, queue up the GOOD response
+	 * for this SYNCHRONIZE_CACHE op
+	 */
+	if (immed)
+		transport_complete_sync_cache(cmd, 1);
+
+	/*
+	 * blkdev_issue_flush() does not support a specifying a range, so
+	 * we have to flush the entire cache.
+	 */
+	ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector);
+	if (ret != 0) {
+		printk(KERN_ERR "IBLOCK: block_issue_flush() failed: %d "
+			" error_sector: %llu\n", ret,
+			(unsigned long long)error_sector);
+	}
+
+	if (!immed)
+		transport_complete_sync_cache(cmd, ret == 0);
+}
+
+/*
+ * Tell TCM Core that we are capable of WriteCache emulation for
+ * an underlying struct se_device.
+ */
+static int iblock_emulated_write_cache(struct se_device *dev)
+{
+	return 1;
+}
+
+static int iblock_emulated_dpo(struct se_device *dev)
+{
+	return 0;
+}
+
+/*
+ * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs
+ * for TYPE_DISK.
+ */
+static int iblock_emulated_fua_write(struct se_device *dev)
+{
+	return 1;
+}
+
+static int iblock_emulated_fua_read(struct se_device *dev)
+{
+	return 0;
+}
+
+static int iblock_do_task(struct se_task *task)
+{
+	struct se_device *dev = task->task_se_cmd->se_dev;
+	struct iblock_req *req = IBLOCK_REQ(task);
+	struct iblock_dev *ibd = (struct iblock_dev *)req->ib_dev;
+	struct request_queue *q = bdev_get_queue(ibd->ibd_bd);
+	struct bio *bio = req->ib_bio, *nbio = NULL;
+	int rw;
+
+	if (task->task_data_direction == DMA_TO_DEVICE) {
+		/*
+		 * Force data to disk if we pretend to not have a volatile
+		 * write cache, or the initiator set the Force Unit Access bit.
+		 */
+		if (DEV_ATTRIB(dev)->emulate_write_cache == 0 ||
+		    (DEV_ATTRIB(dev)->emulate_fua_write > 0 &&
+		     T_TASK(task->task_se_cmd)->t_tasks_fua))
+			rw = WRITE_FUA;
+		else
+			rw = WRITE;
+	} else {
+		rw = READ;
+	}
+
+	while (bio) {
+		nbio = bio->bi_next;
+		bio->bi_next = NULL;
+		DEBUG_IBLOCK("Calling submit_bio() task: %p bio: %p"
+			" bio->bi_sector: %llu\n", task, bio, bio->bi_sector);
+
+		submit_bio(rw, bio);
+		bio = nbio;
+	}
+
+	if (q->unplug_fn)
+		q->unplug_fn(q);
+	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range)
+{
+	struct iblock_dev *ibd = dev->dev_ptr;
+	struct block_device *bd = ibd->ibd_bd;
+	int barrier = 0;
+
+	return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier);
+}
+
+static void iblock_free_task(struct se_task *task)
+{
+	struct iblock_req *req = IBLOCK_REQ(task);
+	struct bio *bio, *hbio = req->ib_bio;
+	/*
+	 * We only release the bio(s) here if iblock_bio_done() has not called
+	 * bio_put() -> iblock_bio_destructor().
+	 */
+	while (hbio != NULL) {
+		bio = hbio;
+		hbio = hbio->bi_next;
+		bio->bi_next = NULL;
+		bio_put(bio);
+	}
+
+	kfree(req);
+}
+
+enum {
+	Opt_udev_path, Opt_force, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_udev_path, "udev_path=%s"},
+	{Opt_force, "force=%d"},
+	{Opt_err, NULL}
+};
+
+static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba,
+					       struct se_subsystem_dev *se_dev,
+					       const char *page, ssize_t count)
+{
+	struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr;
+	char *orig, *ptr, *opts;
+	substring_t args[MAX_OPT_ARGS];
+	int ret = 0, arg, token;
+
+	opts = kstrdup(page, GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	orig = opts;
+
+	while ((ptr = strsep(&opts, ",")) != NULL) {
+		if (!*ptr)
+			continue;
+
+		token = match_token(ptr, tokens, args);
+		switch (token) {
+		case Opt_udev_path:
+			if (ib_dev->ibd_bd) {
+				printk(KERN_ERR "Unable to set udev_path= while"
+					" ib_dev->ibd_bd exists\n");
+				ret = -EEXIST;
+				goto out;
+			}
+
+			ret = snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
+				"%s", match_strdup(&args[0]));
+			printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n",
+					ib_dev->ibd_udev_path);
+			ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
+			break;
+		case Opt_force:
+			match_int(args, &arg);
+			ib_dev->ibd_force = arg;
+			printk(KERN_INFO "IBLOCK: Set force=%d\n",
+				ib_dev->ibd_force);
+			break;
+		default:
+			break;
+		}
+	}
+
+out:
+	kfree(orig);
+	return (!ret) ? count : ret;
+}
+
+static ssize_t iblock_check_configfs_dev_params(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev)
+{
+	struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
+
+	if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) {
+		printk(KERN_ERR "Missing udev_path= parameters for IBLOCK\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static ssize_t iblock_show_configfs_dev_params(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	char *b)
+{
+	struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
+	struct block_device *bd = ibd->ibd_bd;
+	char buf[BDEVNAME_SIZE];
+	ssize_t bl = 0;
+
+	if (bd)
+		bl += sprintf(b + bl, "iBlock device: %s",
+				bdevname(bd, buf));
+	if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) {
+		bl += sprintf(b + bl, "  UDEV PATH: %s\n",
+				ibd->ibd_udev_path);
+	} else
+		bl += sprintf(b + bl, "\n");
+
+	bl += sprintf(b + bl, "        ");
+	if (bd) {
+		bl += sprintf(b + bl, "Major: %d Minor: %d  %s\n",
+			ibd->ibd_major, ibd->ibd_minor, (!bd->bd_contains) ?
+			"" : (bd->bd_holder == (struct iblock_dev *)ibd) ?
+			"CLAIMED: IBLOCK" : "CLAIMED: OS");
+	} else {
+		bl += sprintf(b + bl, "Major: %d Minor: %d\n",
+			ibd->ibd_major, ibd->ibd_minor);
+	}
+
+	return bl;
+}
+
+static void iblock_bio_destructor(struct bio *bio)
+{
+	struct se_task *task = bio->bi_private;
+	struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
+
+	bio_free(bio, ib_dev->ibd_bio_set);
+}
+
+static struct bio *iblock_get_bio(
+	struct se_task *task,
+	struct iblock_req *ib_req,
+	struct iblock_dev *ib_dev,
+	int *ret,
+	sector_t lba,
+	u32 sg_num)
+{
+	struct bio *bio;
+
+	bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
+	if (!(bio)) {
+		printk(KERN_ERR "Unable to allocate memory for bio\n");
+		*ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+		return NULL;
+	}
+
+	DEBUG_IBLOCK("Allocated bio: %p task_sg_num: %u using ibd_bio_set:"
+		" %p\n", bio, task->task_sg_num, ib_dev->ibd_bio_set);
+	DEBUG_IBLOCK("Allocated bio: %p task_size: %u\n", bio, task->task_size);
+
+	bio->bi_bdev = ib_dev->ibd_bd;
+	bio->bi_private = (void *) task;
+	bio->bi_destructor = iblock_bio_destructor;
+	bio->bi_end_io = &iblock_bio_done;
+	bio->bi_sector = lba;
+	atomic_inc(&ib_req->ib_bio_cnt);
+
+	DEBUG_IBLOCK("Set bio->bi_sector: %llu\n", bio->bi_sector);
+	DEBUG_IBLOCK("Set ib_req->ib_bio_cnt: %d\n",
+			atomic_read(&ib_req->ib_bio_cnt));
+	return bio;
+}
+
+static int iblock_map_task_SG(struct se_task *task)
+{
+	struct se_cmd *cmd = task->task_se_cmd;
+	struct se_device *dev = SE_DEV(cmd);
+	struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
+	struct iblock_req *ib_req = IBLOCK_REQ(task);
+	struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
+	struct scatterlist *sg;
+	int ret = 0;
+	u32 i, sg_num = task->task_sg_num;
+	sector_t block_lba;
+	/*
+	 * Do starting conversion up from non 512-byte blocksize with
+	 * struct se_task SCSI blocksize into Linux/Block 512 units for BIO.
+	 */
+	if (DEV_ATTRIB(dev)->block_size == 4096)
+		block_lba = (task->task_lba << 3);
+	else if (DEV_ATTRIB(dev)->block_size == 2048)
+		block_lba = (task->task_lba << 2);
+	else if (DEV_ATTRIB(dev)->block_size == 1024)
+		block_lba = (task->task_lba << 1);
+	else if (DEV_ATTRIB(dev)->block_size == 512)
+		block_lba = task->task_lba;
+	else {
+		printk(KERN_ERR "Unsupported SCSI -> BLOCK LBA conversion:"
+				" %u\n", DEV_ATTRIB(dev)->block_size);
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+
+	bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num);
+	if (!(bio))
+		return ret;
+
+	ib_req->ib_bio = bio;
+	hbio = tbio = bio;
+	/*
+	 * Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist
+	 * from TCM struct se_mem -> task->task_sg -> struct scatterlist memory.
+	 */
+	for_each_sg(task->task_sg, sg, task->task_sg_num, i) {
+		DEBUG_IBLOCK("task: %p bio: %p Calling bio_add_page(): page:"
+			" %p len: %u offset: %u\n", task, bio, sg_page(sg),
+				sg->length, sg->offset);
+again:
+		ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset);
+		if (ret != sg->length) {
+
+			DEBUG_IBLOCK("*** Set bio->bi_sector: %llu\n",
+					bio->bi_sector);
+			DEBUG_IBLOCK("** task->task_size: %u\n",
+					task->task_size);
+			DEBUG_IBLOCK("*** bio->bi_max_vecs: %u\n",
+					bio->bi_max_vecs);
+			DEBUG_IBLOCK("*** bio->bi_vcnt: %u\n",
+					bio->bi_vcnt);
+
+			bio = iblock_get_bio(task, ib_req, ib_dev, &ret,
+						block_lba, sg_num);
+			if (!(bio))
+				goto fail;
+
+			tbio = tbio->bi_next = bio;
+			DEBUG_IBLOCK("-----------------> Added +1 bio: %p to"
+				" list, Going to again\n", bio);
+			goto again;
+		}
+		/* Always in 512 byte units for Linux/Block */
+		block_lba += sg->length >> IBLOCK_LBA_SHIFT;
+		sg_num--;
+		DEBUG_IBLOCK("task: %p bio-add_page() passed!, decremented"
+			" sg_num to %u\n", task, sg_num);
+		DEBUG_IBLOCK("task: %p bio_add_page() passed!, increased lba"
+				" to %llu\n", task, block_lba);
+		DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:"
+				" %u\n", task, bio->bi_vcnt);
+	}
+
+	return 0;
+fail:
+	while (hbio) {
+		bio = hbio;
+		hbio = hbio->bi_next;
+		bio->bi_next = NULL;
+		bio_put(bio);
+	}
+	return ret;
+}
+
+static unsigned char *iblock_get_cdb(struct se_task *task)
+{
+	return IBLOCK_REQ(task)->ib_scsi_cdb;
+}
+
+static u32 iblock_get_device_rev(struct se_device *dev)
+{
+	return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
+}
+
+static u32 iblock_get_device_type(struct se_device *dev)
+{
+	return TYPE_DISK;
+}
+
+static sector_t iblock_get_blocks(struct se_device *dev)
+{
+	struct iblock_dev *ibd = dev->dev_ptr;
+	struct block_device *bd = ibd->ibd_bd;
+	struct request_queue *q = bdev_get_queue(bd);
+
+	return iblock_emulate_read_cap_with_block_size(dev, bd, q);
+}
+
+static void iblock_bio_done(struct bio *bio, int err)
+{
+	struct se_task *task = bio->bi_private;
+	struct iblock_req *ibr = IBLOCK_REQ(task);
+	/*
+	 * Set -EIO if !BIO_UPTODATE and the passed is still err=0
+	 */
+	if (!(test_bit(BIO_UPTODATE, &bio->bi_flags)) && !(err))
+		err = -EIO;
+
+	if (err != 0) {
+		printk(KERN_ERR "test_bit(BIO_UPTODATE) failed for bio: %p,"
+			" err: %d\n", bio, err);
+		/*
+		 * Bump the ib_bio_err_cnt and release bio.
+		 */
+		atomic_inc(&ibr->ib_bio_err_cnt);
+		smp_mb__after_atomic_inc();
+		bio_put(bio);
+		/*
+		 * Wait to complete the task until the last bio as completed.
+		 */
+		if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
+			return;
+
+		ibr->ib_bio = NULL;
+		transport_complete_task(task, 0);
+		return;
+	}
+	DEBUG_IBLOCK("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n",
+		task, bio, task->task_lba, bio->bi_sector, err);
+	/*
+	 * bio_put() will call iblock_bio_destructor() to release the bio back
+	 * to ibr->ib_bio_set.
+	 */
+	bio_put(bio);
+	/*
+	 * Wait to complete the task until the last bio as completed.
+	 */
+	if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
+		return;
+	/*
+	 * Return GOOD status for task if zero ib_bio_err_cnt exists.
+	 */
+	ibr->ib_bio = NULL;
+	transport_complete_task(task, (!atomic_read(&ibr->ib_bio_err_cnt)));
+}
+
+static struct se_subsystem_api iblock_template = {
+	.name			= "iblock",
+	.owner			= THIS_MODULE,
+	.transport_type		= TRANSPORT_PLUGIN_VHBA_PDEV,
+	.map_task_SG		= iblock_map_task_SG,
+	.attach_hba		= iblock_attach_hba,
+	.detach_hba		= iblock_detach_hba,
+	.allocate_virtdevice	= iblock_allocate_virtdevice,
+	.create_virtdevice	= iblock_create_virtdevice,
+	.free_device		= iblock_free_device,
+	.dpo_emulated		= iblock_emulated_dpo,
+	.fua_write_emulated	= iblock_emulated_fua_write,
+	.fua_read_emulated	= iblock_emulated_fua_read,
+	.write_cache_emulated	= iblock_emulated_write_cache,
+	.alloc_task		= iblock_alloc_task,
+	.do_task		= iblock_do_task,
+	.do_discard		= iblock_do_discard,
+	.do_sync_cache		= iblock_emulate_sync_cache,
+	.free_task		= iblock_free_task,
+	.check_configfs_dev_params = iblock_check_configfs_dev_params,
+	.set_configfs_dev_params = iblock_set_configfs_dev_params,
+	.show_configfs_dev_params = iblock_show_configfs_dev_params,
+	.get_cdb		= iblock_get_cdb,
+	.get_device_rev		= iblock_get_device_rev,
+	.get_device_type	= iblock_get_device_type,
+	.get_blocks		= iblock_get_blocks,
+};
+
+static int __init iblock_module_init(void)
+{
+	return transport_subsystem_register(&iblock_template);
+}
+
+static void iblock_module_exit(void)
+{
+	transport_subsystem_release(&iblock_template);
+}
+
+MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
+MODULE_AUTHOR("nab@Linux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(iblock_module_init);
+module_exit(iblock_module_exit);
diff --git a/drivers/target/target_core_iblock.h b/drivers/target/target_core_iblock.h
new file mode 100644
index 0000000..64c1f4d
--- /dev/null
+++ b/drivers/target/target_core_iblock.h
@@ -0,0 +1,40 @@
+#ifndef TARGET_CORE_IBLOCK_H
+#define TARGET_CORE_IBLOCK_H
+
+#define IBLOCK_VERSION		"4.0"
+
+#define IBLOCK_HBA_QUEUE_DEPTH	512
+#define IBLOCK_DEVICE_QUEUE_DEPTH	32
+#define IBLOCK_MAX_DEVICE_QUEUE_DEPTH	128
+#define IBLOCK_MAX_CDBS		16
+#define IBLOCK_LBA_SHIFT	9
+
+struct iblock_req {
+	struct se_task ib_task;
+	unsigned char ib_scsi_cdb[TCM_MAX_COMMAND_SIZE];
+	atomic_t ib_bio_cnt;
+	atomic_t ib_bio_err_cnt;
+	struct bio *ib_bio;
+	struct iblock_dev *ib_dev;
+} ____cacheline_aligned;
+
+#define IBDF_HAS_UDEV_PATH		0x01
+#define IBDF_HAS_FORCE			0x02
+
+struct iblock_dev {
+	unsigned char ibd_udev_path[SE_UDEV_PATH_LEN];
+	int	ibd_force;
+	int	ibd_major;
+	int	ibd_minor;
+	u32	ibd_depth;
+	u32	ibd_flags;
+	struct bio_set	*ibd_bio_set;
+	struct block_device *ibd_bd;
+	struct iblock_hba *ibd_host;
+} ____cacheline_aligned;
+
+struct iblock_hba {
+	int		iblock_host_id;
+} ____cacheline_aligned;
+
+#endif /* TARGET_CORE_IBLOCK_H */
diff --git a/drivers/target/target_core_mib.c b/drivers/target/target_core_mib.c
new file mode 100644
index 0000000..d5a48aa
--- /dev/null
+++ b/drivers/target/target_core_mib.c
@@ -0,0 +1,1078 @@
+/*******************************************************************************
+ * Filename:  target_core_mib.c
+ *
+ * Copyright (c) 2006-2007 SBE, Inc.  All Rights Reserved.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@linux-iscsi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/version.h>
+#include <generated/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/blkdev.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_hba.h"
+#include "target_core_mib.h"
+
+/* SCSI mib table index */
+static struct scsi_index_table scsi_index_table;
+
+#ifndef INITIAL_JIFFIES
+#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))
+#endif
+
+/* SCSI Instance Table */
+#define SCSI_INST_SW_INDEX		1
+#define SCSI_TRANSPORT_INDEX		1
+
+#define NONE		"None"
+#define ISPRINT(a)   ((a >= ' ') && (a <= '~'))
+
+static inline int list_is_first(const struct list_head *list,
+				const struct list_head *head)
+{
+	return list->prev == head;
+}
+
+static void *locate_hba_start(
+	struct seq_file *seq,
+	loff_t *pos)
+{
+	spin_lock(&se_global->g_device_lock);
+	return seq_list_start(&se_global->g_se_dev_list, *pos);
+}
+
+static void *locate_hba_next(
+	struct seq_file *seq,
+	void *v,
+	loff_t *pos)
+{
+	return seq_list_next(v, &se_global->g_se_dev_list, pos);
+}
+
+static void locate_hba_stop(struct seq_file *seq, void *v)
+{
+	spin_unlock(&se_global->g_device_lock);
+}
+
+/****************************************************************************
+ * SCSI MIB Tables
+ ****************************************************************************/
+
+/*
+ * SCSI Instance Table
+ */
+static void *scsi_inst_seq_start(
+	struct seq_file *seq,
+	loff_t *pos)
+{
+	spin_lock(&se_global->hba_lock);
+	return seq_list_start(&se_global->g_hba_list, *pos);
+}
+
+static void *scsi_inst_seq_next(
+	struct seq_file *seq,
+	void *v,
+	loff_t *pos)
+{
+	return seq_list_next(v, &se_global->g_hba_list, pos);
+}
+
+static void scsi_inst_seq_stop(struct seq_file *seq, void *v)
+{
+	spin_unlock(&se_global->hba_lock);
+}
+
+static int scsi_inst_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_hba *hba = list_entry(v, struct se_hba, hba_list);
+
+	if (list_is_first(&hba->hba_list, &se_global->g_hba_list))
+		seq_puts(seq, "inst sw_indx\n");
+
+	seq_printf(seq, "%u %u\n", hba->hba_index, SCSI_INST_SW_INDEX);
+	seq_printf(seq, "plugin: %s version: %s\n",
+			hba->transport->name, TARGET_CORE_VERSION);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_inst_seq_ops = {
+	.start	= scsi_inst_seq_start,
+	.next	= scsi_inst_seq_next,
+	.stop	= scsi_inst_seq_stop,
+	.show	= scsi_inst_seq_show
+};
+
+static int scsi_inst_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_inst_seq_ops);
+}
+
+static const struct file_operations scsi_inst_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_inst_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Device Table
+ */
+static void *scsi_dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return locate_hba_start(seq, pos);
+}
+
+static void *scsi_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return locate_hba_next(seq, v, pos);
+}
+
+static void scsi_dev_seq_stop(struct seq_file *seq, void *v)
+{
+	locate_hba_stop(seq, v);
+}
+
+static int scsi_dev_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_hba *hba;
+	struct se_subsystem_dev *se_dev = list_entry(v, struct se_subsystem_dev,
+						g_se_dev_list);
+	struct se_device *dev = se_dev->se_dev_ptr;
+	char str[28];
+	int k;
+
+	if (list_is_first(&se_dev->g_se_dev_list, &se_global->g_se_dev_list))
+		seq_puts(seq, "inst indx role ports\n");
+
+	if (!(dev))
+		return 0;
+
+	hba = dev->se_hba;
+	if (!(hba)) {
+		/* Log error ? */
+		return 0;
+	}
+
+	seq_printf(seq, "%u %u %s %u\n", hba->hba_index,
+		   dev->dev_index, "Target", dev->dev_port_count);
+
+	memcpy(&str[0], (void *)DEV_T10_WWN(dev), 28);
+
+	/* vendor */
+	for (k = 0; k < 8; k++)
+		str[k] = ISPRINT(DEV_T10_WWN(dev)->vendor[k]) ?
+				DEV_T10_WWN(dev)->vendor[k] : 0x20;
+	str[k] = 0x20;
+
+	/* model */
+	for (k = 0; k < 16; k++)
+		str[k+9] = ISPRINT(DEV_T10_WWN(dev)->model[k]) ?
+				DEV_T10_WWN(dev)->model[k] : 0x20;
+	str[k + 9] = 0;
+
+	seq_printf(seq, "dev_alias: %s\n", str);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_dev_seq_ops = {
+	.start  = scsi_dev_seq_start,
+	.next   = scsi_dev_seq_next,
+	.stop   = scsi_dev_seq_stop,
+	.show   = scsi_dev_seq_show
+};
+
+static int scsi_dev_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_dev_seq_ops);
+}
+
+static const struct file_operations scsi_dev_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_dev_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Port Table
+ */
+static void *scsi_port_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return locate_hba_start(seq, pos);
+}
+
+static void *scsi_port_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return locate_hba_next(seq, v, pos);
+}
+
+static void scsi_port_seq_stop(struct seq_file *seq, void *v)
+{
+	locate_hba_stop(seq, v);
+}
+
+static int scsi_port_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_hba *hba;
+	struct se_subsystem_dev *se_dev = list_entry(v, struct se_subsystem_dev,
+						g_se_dev_list);
+	struct se_device *dev = se_dev->se_dev_ptr;
+	struct se_port *sep, *sep_tmp;
+
+	if (list_is_first(&se_dev->g_se_dev_list, &se_global->g_se_dev_list))
+		seq_puts(seq, "inst device indx role busy_count\n");
+
+	if (!(dev))
+		return 0;
+
+	hba = dev->se_hba;
+	if (!(hba)) {
+		/* Log error ? */
+		return 0;
+	}
+
+	/* FIXME: scsiPortBusyStatuses count */
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry_safe(sep, sep_tmp, &dev->dev_sep_list, sep_list) {
+		seq_printf(seq, "%u %u %u %s%u %u\n", hba->hba_index,
+			dev->dev_index, sep->sep_index, "Device",
+			dev->dev_index, 0);
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_port_seq_ops = {
+	.start  = scsi_port_seq_start,
+	.next   = scsi_port_seq_next,
+	.stop   = scsi_port_seq_stop,
+	.show   = scsi_port_seq_show
+};
+
+static int scsi_port_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_port_seq_ops);
+}
+
+static const struct file_operations scsi_port_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_port_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Transport Table
+ */
+static void *scsi_transport_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return locate_hba_start(seq, pos);
+}
+
+static void *scsi_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return locate_hba_next(seq, v, pos);
+}
+
+static void scsi_transport_seq_stop(struct seq_file *seq, void *v)
+{
+	locate_hba_stop(seq, v);
+}
+
+static int scsi_transport_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_hba *hba;
+	struct se_subsystem_dev *se_dev = list_entry(v, struct se_subsystem_dev,
+						g_se_dev_list);
+	struct se_device *dev = se_dev->se_dev_ptr;
+	struct se_port *se, *se_tmp;
+	struct se_portal_group *tpg;
+	struct t10_wwn *wwn;
+	char buf[64];
+
+	if (list_is_first(&se_dev->g_se_dev_list, &se_global->g_se_dev_list))
+		seq_puts(seq, "inst device indx dev_name\n");
+
+	if (!(dev))
+		return 0;
+
+	hba = dev->se_hba;
+	if (!(hba)) {
+		/* Log error ? */
+		return 0;
+	}
+
+	wwn = DEV_T10_WWN(dev);
+
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry_safe(se, se_tmp, &dev->dev_sep_list, sep_list) {
+		tpg = se->sep_tpg;
+		sprintf(buf, "scsiTransport%s",
+				TPG_TFO(tpg)->get_fabric_name());
+
+		seq_printf(seq, "%u %s %u %s+%s\n",
+			hba->hba_index, /* scsiTransportIndex */
+			buf,  /* scsiTransportType */
+			(TPG_TFO(tpg)->tpg_get_inst_index != NULL) ?
+			TPG_TFO(tpg)->tpg_get_inst_index(tpg) :
+			0,
+			TPG_TFO(tpg)->tpg_get_wwn(tpg),
+			(strlen(wwn->unit_serial)) ?
+			/* scsiTransportDevName */
+			wwn->unit_serial : wwn->vendor);
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_transport_seq_ops = {
+	.start  = scsi_transport_seq_start,
+	.next   = scsi_transport_seq_next,
+	.stop   = scsi_transport_seq_stop,
+	.show   = scsi_transport_seq_show
+};
+
+static int scsi_transport_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_transport_seq_ops);
+}
+
+static const struct file_operations scsi_transport_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_transport_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Target Device Table
+ */
+static void *scsi_tgt_dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return locate_hba_start(seq, pos);
+}
+
+static void *scsi_tgt_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return locate_hba_next(seq, v, pos);
+}
+
+static void scsi_tgt_dev_seq_stop(struct seq_file *seq, void *v)
+{
+	locate_hba_stop(seq, v);
+}
+
+
+#define LU_COUNT	1  /* for now */
+static int scsi_tgt_dev_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_hba *hba;
+	struct se_subsystem_dev *se_dev = list_entry(v, struct se_subsystem_dev,
+						g_se_dev_list);
+	struct se_device *dev = se_dev->se_dev_ptr;
+	int non_accessible_lus = 0;
+	char status[16];
+
+	if (list_is_first(&se_dev->g_se_dev_list, &se_global->g_se_dev_list))
+		seq_puts(seq, "inst indx num_LUs status non_access_LUs"
+			" resets\n");
+
+	if (!(dev))
+		return 0;
+
+	hba = dev->se_hba;
+	if (!(hba)) {
+		/* Log error ? */
+		return 0;
+	}
+
+	switch (dev->dev_status) {
+	case TRANSPORT_DEVICE_ACTIVATED:
+		strcpy(status, "activated");
+		break;
+	case TRANSPORT_DEVICE_DEACTIVATED:
+		strcpy(status, "deactivated");
+		non_accessible_lus = 1;
+		break;
+	case TRANSPORT_DEVICE_SHUTDOWN:
+		strcpy(status, "shutdown");
+		non_accessible_lus = 1;
+		break;
+	case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
+	case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
+		strcpy(status, "offline");
+		non_accessible_lus = 1;
+		break;
+	default:
+		sprintf(status, "unknown(%d)", dev->dev_status);
+		non_accessible_lus = 1;
+	}
+
+	seq_printf(seq, "%u %u %u %s %u %u\n",
+		   hba->hba_index, dev->dev_index, LU_COUNT,
+		   status, non_accessible_lus, dev->num_resets);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_tgt_dev_seq_ops = {
+	.start  = scsi_tgt_dev_seq_start,
+	.next   = scsi_tgt_dev_seq_next,
+	.stop   = scsi_tgt_dev_seq_stop,
+	.show   = scsi_tgt_dev_seq_show
+};
+
+static int scsi_tgt_dev_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_tgt_dev_seq_ops);
+}
+
+static const struct file_operations scsi_tgt_dev_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_tgt_dev_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Target Port Table
+ */
+static void *scsi_tgt_port_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return locate_hba_start(seq, pos);
+}
+
+static void *scsi_tgt_port_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return locate_hba_next(seq, v, pos);
+}
+
+static void scsi_tgt_port_seq_stop(struct seq_file *seq, void *v)
+{
+	locate_hba_stop(seq, v);
+}
+
+static int scsi_tgt_port_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_hba *hba;
+	struct se_subsystem_dev *se_dev = list_entry(v, struct se_subsystem_dev,
+						g_se_dev_list);
+	struct se_device *dev = se_dev->se_dev_ptr;
+	struct se_port *sep, *sep_tmp;
+	struct se_portal_group *tpg;
+	u32 rx_mbytes, tx_mbytes;
+	unsigned long long num_cmds;
+	char buf[64];
+
+	if (list_is_first(&se_dev->g_se_dev_list, &se_global->g_se_dev_list))
+		seq_puts(seq, "inst device indx name port_index in_cmds"
+			" write_mbytes read_mbytes hs_in_cmds\n");
+
+	if (!(dev))
+		return 0;
+
+	hba = dev->se_hba;
+	if (!(hba)) {
+		/* Log error ? */
+		return 0;
+	}
+
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry_safe(sep, sep_tmp, &dev->dev_sep_list, sep_list) {
+		tpg = sep->sep_tpg;
+		sprintf(buf, "%sPort#",
+			TPG_TFO(tpg)->get_fabric_name());
+
+		seq_printf(seq, "%u %u %u %s%d %s%s%d ",
+		     hba->hba_index,
+		     dev->dev_index,
+		     sep->sep_index,
+		     buf, sep->sep_index,
+		     TPG_TFO(tpg)->tpg_get_wwn(tpg), "+t+",
+		     TPG_TFO(tpg)->tpg_get_tag(tpg));
+
+		spin_lock(&sep->sep_lun->lun_sep_lock);
+		num_cmds = sep->sep_stats.cmd_pdus;
+		rx_mbytes = (sep->sep_stats.rx_data_octets >> 20);
+		tx_mbytes = (sep->sep_stats.tx_data_octets >> 20);
+		spin_unlock(&sep->sep_lun->lun_sep_lock);
+
+		seq_printf(seq, "%llu %u %u %u\n", num_cmds,
+			rx_mbytes, tx_mbytes, 0);
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_tgt_port_seq_ops = {
+	.start  = scsi_tgt_port_seq_start,
+	.next   = scsi_tgt_port_seq_next,
+	.stop   = scsi_tgt_port_seq_stop,
+	.show   = scsi_tgt_port_seq_show
+};
+
+static int scsi_tgt_port_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_tgt_port_seq_ops);
+}
+
+static const struct file_operations scsi_tgt_port_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_tgt_port_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Authorized Initiator Table:
+ * It contains the SCSI Initiators authorized to be attached to one of the
+ * local Target ports.
+ * Iterates through all active TPGs and extracts the info from the ACLs
+ */
+static void *scsi_auth_intr_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	spin_lock_bh(&se_global->se_tpg_lock);
+	return seq_list_start(&se_global->g_se_tpg_list, *pos);
+}
+
+static void *scsi_auth_intr_seq_next(struct seq_file *seq, void *v,
+					 loff_t *pos)
+{
+	return seq_list_next(v, &se_global->g_se_tpg_list, pos);
+}
+
+static void scsi_auth_intr_seq_stop(struct seq_file *seq, void *v)
+{
+	spin_unlock_bh(&se_global->se_tpg_lock);
+}
+
+static int scsi_auth_intr_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_portal_group *se_tpg = list_entry(v, struct se_portal_group,
+						se_tpg_list);
+	struct se_dev_entry *deve;
+	struct se_lun *lun;
+	struct se_node_acl *se_nacl;
+	int j;
+
+	if (list_is_first(&se_tpg->se_tpg_list,
+			  &se_global->g_se_tpg_list))
+		seq_puts(seq, "inst dev port indx dev_or_port intr_name "
+			 "map_indx att_count num_cmds read_mbytes "
+			 "write_mbytes hs_num_cmds creation_time row_status\n");
+
+	if (!(se_tpg))
+		return 0;
+
+	spin_lock(&se_tpg->acl_node_lock);
+	list_for_each_entry(se_nacl, &se_tpg->acl_node_list, acl_list) {
+
+		atomic_inc(&se_nacl->mib_ref_count);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&se_tpg->acl_node_lock);
+
+		spin_lock_irq(&se_nacl->device_list_lock);
+		for (j = 0; j < TRANSPORT_MAX_LUNS_PER_TPG; j++) {
+			deve = &se_nacl->device_list[j];
+			if (!(deve->lun_flags &
+					TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) ||
+			    (!deve->se_lun))
+				continue;
+			lun = deve->se_lun;
+			if (!lun->lun_se_dev)
+				continue;
+
+			seq_printf(seq, "%u %u %u %u %u %s %u %u %u %u %u %u"
+					" %u %s\n",
+				/* scsiInstIndex */
+				(TPG_TFO(se_tpg)->tpg_get_inst_index != NULL) ?
+				TPG_TFO(se_tpg)->tpg_get_inst_index(se_tpg) :
+				0,
+				/* scsiDeviceIndex */
+				lun->lun_se_dev->dev_index,
+				/* scsiAuthIntrTgtPortIndex */
+				TPG_TFO(se_tpg)->tpg_get_tag(se_tpg),
+				/* scsiAuthIntrIndex */
+				se_nacl->acl_index,
+				/* scsiAuthIntrDevOrPort */
+				1,
+				/* scsiAuthIntrName */
+				se_nacl->initiatorname[0] ?
+					se_nacl->initiatorname : NONE,
+				/* FIXME: scsiAuthIntrLunMapIndex */
+				0,
+				/* scsiAuthIntrAttachedTimes */
+				deve->attach_count,
+				/* scsiAuthIntrOutCommands */
+				deve->total_cmds,
+				/* scsiAuthIntrReadMegaBytes */
+				(u32)(deve->read_bytes >> 20),
+				/* scsiAuthIntrWrittenMegaBytes */
+				(u32)(deve->write_bytes >> 20),
+				/* FIXME: scsiAuthIntrHSOutCommands */
+				0,
+				/* scsiAuthIntrLastCreation */
+				(u32)(((u32)deve->creation_time -
+					    INITIAL_JIFFIES) * 100 / HZ),
+				/* FIXME: scsiAuthIntrRowStatus */
+				"Ready");
+		}
+		spin_unlock_irq(&se_nacl->device_list_lock);
+
+		spin_lock(&se_tpg->acl_node_lock);
+		atomic_dec(&se_nacl->mib_ref_count);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&se_tpg->acl_node_lock);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_auth_intr_seq_ops = {
+	.start	= scsi_auth_intr_seq_start,
+	.next	= scsi_auth_intr_seq_next,
+	.stop	= scsi_auth_intr_seq_stop,
+	.show	= scsi_auth_intr_seq_show
+};
+
+static int scsi_auth_intr_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_auth_intr_seq_ops);
+}
+
+static const struct file_operations scsi_auth_intr_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_auth_intr_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Attached Initiator Port Table:
+ * It lists the SCSI Initiators attached to one of the local Target ports.
+ * Iterates through all active TPGs and use active sessions from each TPG
+ * to list the info fo this table.
+ */
+static void *scsi_att_intr_port_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	spin_lock_bh(&se_global->se_tpg_lock);
+	return seq_list_start(&se_global->g_se_tpg_list, *pos);
+}
+
+static void *scsi_att_intr_port_seq_next(struct seq_file *seq, void *v,
+					 loff_t *pos)
+{
+	return seq_list_next(v, &se_global->g_se_tpg_list, pos);
+}
+
+static void scsi_att_intr_port_seq_stop(struct seq_file *seq, void *v)
+{
+	spin_unlock_bh(&se_global->se_tpg_lock);
+}
+
+static int scsi_att_intr_port_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_portal_group *se_tpg = list_entry(v, struct se_portal_group,
+						se_tpg_list);
+	struct se_dev_entry *deve;
+	struct se_lun *lun;
+	struct se_node_acl *se_nacl;
+	struct se_session *se_sess;
+	unsigned char buf[64];
+	int j;
+
+	if (list_is_first(&se_tpg->se_tpg_list,
+			  &se_global->g_se_tpg_list))
+		seq_puts(seq, "inst dev port indx port_auth_indx port_name"
+			" port_ident\n");
+
+	if (!(se_tpg))
+		return 0;
+
+	spin_lock(&se_tpg->session_lock);
+	list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
+		if ((TPG_TFO(se_tpg)->sess_logged_in(se_sess)) ||
+		    (!se_sess->se_node_acl) ||
+		    (!se_sess->se_node_acl->device_list))
+			continue;
+
+		atomic_inc(&se_sess->mib_ref_count);
+		smp_mb__after_atomic_inc();
+		se_nacl = se_sess->se_node_acl;
+		atomic_inc(&se_nacl->mib_ref_count);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&se_tpg->session_lock);
+
+		spin_lock_irq(&se_nacl->device_list_lock);
+		for (j = 0; j < TRANSPORT_MAX_LUNS_PER_TPG; j++) {
+			deve = &se_nacl->device_list[j];
+			if (!(deve->lun_flags &
+					TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) ||
+			   (!deve->se_lun))
+				continue;
+
+			lun = deve->se_lun;
+			if (!lun->lun_se_dev)
+				continue;
+
+			memset(buf, 0, 64);
+			if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL)
+				TPG_TFO(se_tpg)->sess_get_initiator_sid(
+					se_sess, (unsigned char *)&buf[0], 64);
+
+			seq_printf(seq, "%u %u %u %u %u %s+i+%s\n",
+				/* scsiInstIndex */
+				(TPG_TFO(se_tpg)->tpg_get_inst_index != NULL) ?
+				TPG_TFO(se_tpg)->tpg_get_inst_index(se_tpg) :
+				0,
+				/* scsiDeviceIndex */
+				lun->lun_se_dev->dev_index,
+				/* scsiPortIndex */
+				TPG_TFO(se_tpg)->tpg_get_tag(se_tpg),
+				/* scsiAttIntrPortIndex */
+				(TPG_TFO(se_tpg)->sess_get_index != NULL) ?
+				TPG_TFO(se_tpg)->sess_get_index(se_sess) :
+				0,
+				/* scsiAttIntrPortAuthIntrIdx */
+				se_nacl->acl_index,
+				/* scsiAttIntrPortName */
+				se_nacl->initiatorname[0] ?
+					se_nacl->initiatorname : NONE,
+				/* scsiAttIntrPortIdentifier */
+				buf);
+		}
+		spin_unlock_irq(&se_nacl->device_list_lock);
+
+		spin_lock(&se_tpg->session_lock);
+		atomic_dec(&se_nacl->mib_ref_count);
+		smp_mb__after_atomic_dec();
+		atomic_dec(&se_sess->mib_ref_count);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&se_tpg->session_lock);
+
+	return 0;
+}
+
+static const struct seq_operations scsi_att_intr_port_seq_ops = {
+	.start	= scsi_att_intr_port_seq_start,
+	.next	= scsi_att_intr_port_seq_next,
+	.stop	= scsi_att_intr_port_seq_stop,
+	.show	= scsi_att_intr_port_seq_show
+};
+
+static int scsi_att_intr_port_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_att_intr_port_seq_ops);
+}
+
+static const struct file_operations scsi_att_intr_port_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_att_intr_port_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/*
+ * SCSI Logical Unit Table
+ */
+static void *scsi_lu_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return locate_hba_start(seq, pos);
+}
+
+static void *scsi_lu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return locate_hba_next(seq, v, pos);
+}
+
+static void scsi_lu_seq_stop(struct seq_file *seq, void *v)
+{
+	locate_hba_stop(seq, v);
+}
+
+#define SCSI_LU_INDEX		1
+static int scsi_lu_seq_show(struct seq_file *seq, void *v)
+{
+	struct se_hba *hba;
+	struct se_subsystem_dev *se_dev = list_entry(v, struct se_subsystem_dev,
+						g_se_dev_list);
+	struct se_device *dev = se_dev->se_dev_ptr;
+	int j;
+	char str[28];
+
+	if (list_is_first(&se_dev->g_se_dev_list, &se_global->g_se_dev_list))
+		seq_puts(seq, "inst dev indx LUN lu_name vend prod rev"
+		" dev_type status state-bit num_cmds read_mbytes"
+		" write_mbytes resets full_stat hs_num_cmds creation_time\n");
+
+	if (!(dev))
+		return 0;
+
+	hba = dev->se_hba;
+	if (!(hba)) {
+		/* Log error ? */
+		return 0;
+	}
+
+	/* Fix LU state, if we can read it from the device */
+	seq_printf(seq, "%u %u %u %llu %s", hba->hba_index,
+			dev->dev_index, SCSI_LU_INDEX,
+			(unsigned long long)0, /* FIXME: scsiLuDefaultLun */
+			(strlen(DEV_T10_WWN(dev)->unit_serial)) ?
+			/* scsiLuWwnName */
+			(char *)&DEV_T10_WWN(dev)->unit_serial[0] :
+			"None");
+
+	memcpy(&str[0], (void *)DEV_T10_WWN(dev), 28);
+	/* scsiLuVendorId */
+	for (j = 0; j < 8; j++)
+		str[j] = ISPRINT(DEV_T10_WWN(dev)->vendor[j]) ?
+			DEV_T10_WWN(dev)->vendor[j] : 0x20;
+	str[8] = 0;
+	seq_printf(seq, " %s", str);
+
+	/* scsiLuProductId */
+	for (j = 0; j < 16; j++)
+		str[j] = ISPRINT(DEV_T10_WWN(dev)->model[j]) ?
+			DEV_T10_WWN(dev)->model[j] : 0x20;
+	str[16] = 0;
+	seq_printf(seq, " %s", str);
+
+	/* scsiLuRevisionId */
+	for (j = 0; j < 4; j++)
+		str[j] = ISPRINT(DEV_T10_WWN(dev)->revision[j]) ?
+			DEV_T10_WWN(dev)->revision[j] : 0x20;
+	str[4] = 0;
+	seq_printf(seq, " %s", str);
+
+	seq_printf(seq, " %u %s %s %llu %u %u %u %u %u %u\n",
+		/* scsiLuPeripheralType */
+		   TRANSPORT(dev)->get_device_type(dev),
+		   (dev->dev_status == TRANSPORT_DEVICE_ACTIVATED) ?
+		"available" : "notavailable", /* scsiLuStatus */
+		"exposed", 	/* scsiLuState */
+		(unsigned long long)dev->num_cmds,
+		/* scsiLuReadMegaBytes */
+		(u32)(dev->read_bytes >> 20),
+		/* scsiLuWrittenMegaBytes */
+		(u32)(dev->write_bytes >> 20),
+		dev->num_resets, /* scsiLuInResets */
+		0, /* scsiLuOutTaskSetFullStatus */
+		0, /* scsiLuHSInCommands */
+		(u32)(((u32)dev->creation_time - INITIAL_JIFFIES) *
+							100 / HZ));
+
+	return 0;
+}
+
+static const struct seq_operations scsi_lu_seq_ops = {
+	.start  = scsi_lu_seq_start,
+	.next   = scsi_lu_seq_next,
+	.stop   = scsi_lu_seq_stop,
+	.show   = scsi_lu_seq_show
+};
+
+static int scsi_lu_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &scsi_lu_seq_ops);
+}
+
+static const struct file_operations scsi_lu_seq_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = scsi_lu_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = seq_release,
+};
+
+/****************************************************************************/
+
+/*
+ * Remove proc fs entries
+ */
+void remove_scsi_target_mib(void)
+{
+	remove_proc_entry("scsi_target/mib/scsi_inst", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_dev", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_port", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_transport", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_tgt_dev", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_tgt_port", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_auth_intr", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_att_intr_port", NULL);
+	remove_proc_entry("scsi_target/mib/scsi_lu", NULL);
+	remove_proc_entry("scsi_target/mib", NULL);
+}
+
+/*
+ * Create proc fs entries for the mib tables
+ */
+int init_scsi_target_mib(void)
+{
+	struct proc_dir_entry *dir_entry;
+	struct proc_dir_entry *scsi_inst_entry;
+	struct proc_dir_entry *scsi_dev_entry;
+	struct proc_dir_entry *scsi_port_entry;
+	struct proc_dir_entry *scsi_transport_entry;
+	struct proc_dir_entry *scsi_tgt_dev_entry;
+	struct proc_dir_entry *scsi_tgt_port_entry;
+	struct proc_dir_entry *scsi_auth_intr_entry;
+	struct proc_dir_entry *scsi_att_intr_port_entry;
+	struct proc_dir_entry *scsi_lu_entry;
+
+	dir_entry = proc_mkdir("scsi_target/mib", NULL);
+	if (!(dir_entry)) {
+		printk(KERN_ERR "proc_mkdir() failed.\n");
+		return -1;
+	}
+
+	scsi_inst_entry =
+		create_proc_entry("scsi_target/mib/scsi_inst", 0, NULL);
+	if (scsi_inst_entry)
+		scsi_inst_entry->proc_fops = &scsi_inst_seq_fops;
+	else
+		goto error;
+
+	scsi_dev_entry =
+		create_proc_entry("scsi_target/mib/scsi_dev", 0, NULL);
+	if (scsi_dev_entry)
+		scsi_dev_entry->proc_fops = &scsi_dev_seq_fops;
+	else
+		goto error;
+
+	scsi_port_entry =
+		create_proc_entry("scsi_target/mib/scsi_port", 0, NULL);
+	if (scsi_port_entry)
+		scsi_port_entry->proc_fops = &scsi_port_seq_fops;
+	else
+		goto error;
+
+	scsi_transport_entry =
+		create_proc_entry("scsi_target/mib/scsi_transport", 0, NULL);
+	if (scsi_transport_entry)
+		scsi_transport_entry->proc_fops = &scsi_transport_seq_fops;
+	else
+		goto error;
+
+	scsi_tgt_dev_entry =
+		create_proc_entry("scsi_target/mib/scsi_tgt_dev", 0, NULL);
+	if (scsi_tgt_dev_entry)
+		scsi_tgt_dev_entry->proc_fops = &scsi_tgt_dev_seq_fops;
+	else
+		goto error;
+
+	scsi_tgt_port_entry =
+		create_proc_entry("scsi_target/mib/scsi_tgt_port", 0, NULL);
+	if (scsi_tgt_port_entry)
+		scsi_tgt_port_entry->proc_fops = &scsi_tgt_port_seq_fops;
+	else
+		goto error;
+
+	scsi_auth_intr_entry =
+		create_proc_entry("scsi_target/mib/scsi_auth_intr", 0, NULL);
+	if (scsi_auth_intr_entry)
+		scsi_auth_intr_entry->proc_fops = &scsi_auth_intr_seq_fops;
+	else
+		goto error;
+
+	scsi_att_intr_port_entry =
+	      create_proc_entry("scsi_target/mib/scsi_att_intr_port", 0, NULL);
+	if (scsi_att_intr_port_entry)
+		scsi_att_intr_port_entry->proc_fops =
+				&scsi_att_intr_port_seq_fops;
+	else
+		goto error;
+
+	scsi_lu_entry = create_proc_entry("scsi_target/mib/scsi_lu", 0, NULL);
+	if (scsi_lu_entry)
+		scsi_lu_entry->proc_fops = &scsi_lu_seq_fops;
+	else
+		goto error;
+
+	return 0;
+
+error:
+	printk(KERN_ERR "create_proc_entry() failed.\n");
+	remove_scsi_target_mib();
+	return -1;
+}
+
+/*
+ * Initialize the index table for allocating unique row indexes to various mib
+ * tables
+ */
+void init_scsi_index_table(void)
+{
+	memset(&scsi_index_table, 0, sizeof(struct scsi_index_table));
+	spin_lock_init(&scsi_index_table.lock);
+}
+
+/*
+ * Allocate a new row index for the entry type specified
+ */
+u32 scsi_get_new_index(scsi_index_t type)
+{
+	u32 new_index;
+
+	if ((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)) {
+		printk(KERN_ERR "Invalid index type %d\n", type);
+		return -1;
+	}
+
+	spin_lock(&scsi_index_table.lock);
+	new_index = ++scsi_index_table.scsi_mib_index[type];
+	if (new_index == 0)
+		new_index = ++scsi_index_table.scsi_mib_index[type];
+	spin_unlock(&scsi_index_table.lock);
+
+	return new_index;
+}
+EXPORT_SYMBOL(scsi_get_new_index);
diff --git a/drivers/target/target_core_mib.h b/drivers/target/target_core_mib.h
new file mode 100644
index 0000000..2772046
--- /dev/null
+++ b/drivers/target/target_core_mib.h
@@ -0,0 +1,28 @@
+#ifndef TARGET_CORE_MIB_H
+#define TARGET_CORE_MIB_H
+
+typedef enum {
+	SCSI_INST_INDEX,
+	SCSI_DEVICE_INDEX,
+	SCSI_AUTH_INTR_INDEX,
+	SCSI_INDEX_TYPE_MAX
+} scsi_index_t;
+
+struct scsi_index_table {
+	spinlock_t	lock;
+	u32 		scsi_mib_index[SCSI_INDEX_TYPE_MAX];
+} ____cacheline_aligned;
+
+/* SCSI Port stats */
+struct scsi_port_stats {
+	u64	cmd_pdus;
+	u64	tx_data_octets;
+	u64	rx_data_octets;
+} ____cacheline_aligned;
+
+extern int init_scsi_target_mib(void);
+extern void remove_scsi_target_mib(void);
+extern void init_scsi_index_table(void);
+extern u32 scsi_get_new_index(scsi_index_t);
+
+#endif   /*** TARGET_CORE_MIB_H ***/
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
new file mode 100644
index 0000000..2521f75
--- /dev/null
+++ b/drivers/target/target_core_pr.c
@@ -0,0 +1,4252 @@
+/*******************************************************************************
+ * Filename:  target_core_pr.c
+ *
+ * This file contains SPC-3 compliant persistent reservations and
+ * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
+ *
+ * Copyright (c) 2009, 2010 Rising Tide Systems
+ * Copyright (c) 2009, 2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <asm/unaligned.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tmr.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+#include "target_core_ua.h"
+
+/*
+ * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
+ */
+struct pr_transport_id_holder {
+	int dest_local_nexus;
+	struct t10_pr_registration *dest_pr_reg;
+	struct se_portal_group *dest_tpg;
+	struct se_node_acl *dest_node_acl;
+	struct se_dev_entry *dest_se_deve;
+	struct list_head dest_list;
+};
+
+int core_pr_dump_initiator_port(
+	struct t10_pr_registration *pr_reg,
+	char *buf,
+	u32 size)
+{
+	if (!(pr_reg->isid_present_at_reg))
+		return 0;
+
+	snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
+	return 1;
+}
+
+static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
+			struct t10_pr_registration *, int);
+
+static int core_scsi2_reservation_seq_non_holder(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u32 pr_reg_type)
+{
+	switch (cdb[0]) {
+	case INQUIRY:
+	case RELEASE:
+	case RELEASE_10:
+		return 0;
+	default:
+		return 1;
+	}
+
+	return 1;
+}
+
+static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_session *sess = cmd->se_sess;
+	int ret;
+
+	if (!(sess))
+		return 0;
+
+	spin_lock(&dev->dev_reservation_lock);
+	if (!dev->dev_reserved_node_acl || !sess) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return 0;
+	}
+	if (dev->dev_reserved_node_acl != sess->se_node_acl) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return -1;
+	}
+	if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return 0;
+	}
+	ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -1;
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return ret;
+}
+
+static int core_scsi2_reservation_release(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_session *sess = cmd->se_sess;
+	struct se_portal_group *tpg = sess->se_tpg;
+
+	if (!(sess) || !(tpg))
+		return 0;
+
+	spin_lock(&dev->dev_reservation_lock);
+	if (!dev->dev_reserved_node_acl || !sess) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return 0;
+	}
+
+	if (dev->dev_reserved_node_acl != sess->se_node_acl) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return 0;
+	}
+	dev->dev_reserved_node_acl = NULL;
+	dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
+	if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
+		dev->dev_res_bin_isid = 0;
+		dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
+	}
+	printk(KERN_INFO "SCSI-2 Released reservation for %s LUN: %u ->"
+		" MAPPED LUN: %u for %s\n", TPG_TFO(tpg)->get_fabric_name(),
+		SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun,
+		sess->se_node_acl->initiatorname);
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return 0;
+}
+
+static int core_scsi2_reservation_reserve(struct se_cmd *cmd)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_session *sess = cmd->se_sess;
+	struct se_portal_group *tpg = sess->se_tpg;
+
+	if ((T_TASK(cmd)->t_task_cdb[1] & 0x01) &&
+	    (T_TASK(cmd)->t_task_cdb[1] & 0x02)) {
+		printk(KERN_ERR "LongIO and Obselete Bits set, returning"
+				" ILLEGAL_REQUEST\n");
+		return PYX_TRANSPORT_ILLEGAL_REQUEST;
+	}
+	/*
+	 * This is currently the case for target_core_mod passthrough struct se_cmd
+	 * ops
+	 */
+	if (!(sess) || !(tpg))
+		return 0;
+
+	spin_lock(&dev->dev_reservation_lock);
+	if (dev->dev_reserved_node_acl &&
+	   (dev->dev_reserved_node_acl != sess->se_node_acl)) {
+		printk(KERN_ERR "SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
+			TPG_TFO(tpg)->get_fabric_name());
+		printk(KERN_ERR "Original reserver LUN: %u %s\n",
+			SE_LUN(cmd)->unpacked_lun,
+			dev->dev_reserved_node_acl->initiatorname);
+		printk(KERN_ERR "Current attempt - LUN: %u -> MAPPED LUN: %u"
+			" from %s \n", SE_LUN(cmd)->unpacked_lun,
+			cmd->se_deve->mapped_lun,
+			sess->se_node_acl->initiatorname);
+		spin_unlock(&dev->dev_reservation_lock);
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+
+	dev->dev_reserved_node_acl = sess->se_node_acl;
+	dev->dev_flags |= DF_SPC2_RESERVATIONS;
+	if (sess->sess_bin_isid != 0) {
+		dev->dev_res_bin_isid = sess->sess_bin_isid;
+		dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
+	}
+	printk(KERN_INFO "SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
+		" for %s\n", TPG_TFO(tpg)->get_fabric_name(),
+		SE_LUN(cmd)->unpacked_lun, cmd->se_deve->mapped_lun,
+		sess->se_node_acl->initiatorname);
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return 0;
+}
+
+static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
+					struct se_node_acl *, struct se_session *);
+static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
+
+/*
+ * Setup in target_core_transport.c:transport_generic_cmd_sequencer()
+ * and called via struct se_cmd->transport_emulate_cdb() in TCM processing
+ * thread context.
+ */
+int core_scsi2_emulate_crh(struct se_cmd *cmd)
+{
+	struct se_session *se_sess = cmd->se_sess;
+	struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
+	struct t10_pr_registration *pr_reg;
+	struct t10_reservation_template *pr_tmpl = &su_dev->t10_reservation;
+	unsigned char *cdb = &T_TASK(cmd)->t_task_cdb[0];
+	int crh = (T10_RES(su_dev)->res_type == SPC3_PERSISTENT_RESERVATIONS);
+	int conflict = 0;
+
+	if (!(se_sess))
+		return 0;
+
+	if (!(crh))
+		goto after_crh;
+
+	pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
+			se_sess);
+	if (pr_reg) {
+		/*
+		 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
+		 * behavior
+		 *
+		 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
+		 * status, but no reservation shall be established and the
+		 * persistent reservation shall not be changed, if the command
+		 * is received from a) and b) below.
+		 *
+		 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
+		 * status, but the persistent reservation shall not be released,
+		 * if the command is received from a) and b)
+		 *
+		 * a) An I_T nexus that is a persistent reservation holder; or
+		 * b) An I_T nexus that is registered if a registrants only or
+		 *    all registrants type persistent reservation is present.
+		 *
+		 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
+		 * RELEASE(6) command, or RELEASE(10) command shall be processed
+		 * as defined in SPC-2.
+		 */
+		if (pr_reg->pr_res_holder) {
+			core_scsi3_put_pr_reg(pr_reg);
+			return 0;
+		}
+		if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
+		    (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
+		    (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
+		    (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
+			core_scsi3_put_pr_reg(pr_reg);
+			return 0;
+		}
+		core_scsi3_put_pr_reg(pr_reg);
+		conflict = 1;
+	} else {
+		/*
+		 * Following spc2r20 5.5.1 Reservations overview:
+		 *
+		 * If a logical unit has executed a PERSISTENT RESERVE OUT
+		 * command with the REGISTER or the REGISTER AND IGNORE
+		 * EXISTING KEY service action and is still registered by any
+		 * initiator, all RESERVE commands and all RELEASE commands
+		 * regardless of initiator shall conflict and shall terminate
+		 * with a RESERVATION CONFLICT status.
+		 */
+		spin_lock(&pr_tmpl->registration_lock);
+		conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
+		spin_unlock(&pr_tmpl->registration_lock);
+	}
+
+	if (conflict) {
+		printk(KERN_ERR "Received legacy SPC-2 RESERVE/RELEASE"
+			" while active SPC-3 registrations exist,"
+			" returning RESERVATION_CONFLICT\n");
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+
+after_crh:
+	if ((cdb[0] == RESERVE) || (cdb[0] == RESERVE_10))
+		return core_scsi2_reservation_reserve(cmd);
+	else if ((cdb[0] == RELEASE) || (cdb[0] == RELEASE_10))
+		return core_scsi2_reservation_release(cmd);
+	else
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+}
+
+/*
+ * Begin SPC-3/SPC-4 Persistent Reservations emulation support
+ *
+ * This function is called by those initiator ports who are *NOT*
+ * the active PR reservation holder when a reservation is present.
+ */
+static int core_scsi3_pr_seq_non_holder(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u32 pr_reg_type)
+{
+	struct se_dev_entry *se_deve;
+	struct se_session *se_sess = SE_SESS(cmd);
+	int other_cdb = 0, ignore_reg;
+	int registered_nexus = 0, ret = 1; /* Conflict by default */
+	int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
+	int we = 0; /* Write Exclusive */
+	int legacy = 0; /* Act like a legacy device and return
+			 * RESERVATION CONFLICT on some CDBs */
+	/*
+	 * A legacy SPC-2 reservation is being held.
+	 */
+	if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
+		return core_scsi2_reservation_seq_non_holder(cmd,
+					cdb, pr_reg_type);
+
+	se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
+	/*
+	 * Determine if the registration should be ignored due to
+	 * non-matching ISIDs in core_scsi3_pr_reservation_check().
+	 */
+	ignore_reg = (pr_reg_type & 0x80000000);
+	if (ignore_reg)
+		pr_reg_type &= ~0x80000000;
+
+	switch (pr_reg_type) {
+	case PR_TYPE_WRITE_EXCLUSIVE:
+		we = 1;
+	case PR_TYPE_EXCLUSIVE_ACCESS:
+		/*
+		 * Some commands are only allowed for the persistent reservation
+		 * holder.
+		 */
+		if ((se_deve->def_pr_registered) && !(ignore_reg))
+			registered_nexus = 1;
+		break;
+	case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
+		we = 1;
+	case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
+		/*
+		 * Some commands are only allowed for registered I_T Nexuses.
+		 */
+		reg_only = 1;
+		if ((se_deve->def_pr_registered) && !(ignore_reg))
+			registered_nexus = 1;
+		break;
+	case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
+		we = 1;
+	case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
+		/*
+		 * Each registered I_T Nexus is a reservation holder.
+		 */
+		all_reg = 1;
+		if ((se_deve->def_pr_registered) && !(ignore_reg))
+			registered_nexus = 1;
+		break;
+	default:
+		return -1;
+	}
+	/*
+	 * Referenced from spc4r17 table 45 for *NON* PR holder access
+	 */
+	switch (cdb[0]) {
+	case SECURITY_PROTOCOL_IN:
+		if (registered_nexus)
+			return 0;
+		ret = (we) ? 0 : 1;
+		break;
+	case MODE_SENSE:
+	case MODE_SENSE_10:
+	case READ_ATTRIBUTE:
+	case READ_BUFFER:
+	case RECEIVE_DIAGNOSTIC:
+		if (legacy) {
+			ret = 1;
+			break;
+		}
+		if (registered_nexus) {
+			ret = 0;
+			break;
+		}
+		ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
+		break;
+	case PERSISTENT_RESERVE_OUT:
+		/*
+		 * This follows PERSISTENT_RESERVE_OUT service actions that
+		 * are allowed in the presence of various reservations.
+		 * See spc4r17, table 46
+		 */
+		switch (cdb[1] & 0x1f) {
+		case PRO_CLEAR:
+		case PRO_PREEMPT:
+		case PRO_PREEMPT_AND_ABORT:
+			ret = (registered_nexus) ? 0 : 1;
+			break;
+		case PRO_REGISTER:
+		case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
+			ret = 0;
+			break;
+		case PRO_REGISTER_AND_MOVE:
+		case PRO_RESERVE:
+			ret = 1;
+			break;
+		case PRO_RELEASE:
+			ret = (registered_nexus) ? 0 : 1;
+			break;
+		default:
+			printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service"
+				" action: 0x%02x\n", cdb[1] & 0x1f);
+			return -1;
+		}
+		break;
+	case RELEASE:
+	case RELEASE_10:
+		/* Handled by CRH=1 in core_scsi2_emulate_crh() */
+		ret = 0;
+		break;
+	case RESERVE:
+	case RESERVE_10:
+		/* Handled by CRH=1 in core_scsi2_emulate_crh() */
+		ret = 0;
+		break;
+	case TEST_UNIT_READY:
+		ret = (legacy) ? 1 : 0; /* Conflict for legacy */
+		break;
+	case MAINTENANCE_IN:
+		switch (cdb[1] & 0x1f) {
+		case MI_MANAGEMENT_PROTOCOL_IN:
+			if (registered_nexus) {
+				ret = 0;
+				break;
+			}
+			ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
+			break;
+		case MI_REPORT_SUPPORTED_OPERATION_CODES:
+		case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
+			if (legacy) {
+				ret = 1;
+				break;
+			}
+			if (registered_nexus) {
+				ret = 0;
+				break;
+			}
+			ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
+			break;
+		case MI_REPORT_ALIASES:
+		case MI_REPORT_IDENTIFYING_INFORMATION:
+		case MI_REPORT_PRIORITY:
+		case MI_REPORT_TARGET_PGS:
+		case MI_REPORT_TIMESTAMP:
+			ret = 0; /* Allowed */
+			break;
+		default:
+			printk(KERN_ERR "Unknown MI Service Action: 0x%02x\n",
+				(cdb[1] & 0x1f));
+			return -1;
+		}
+		break;
+	case ACCESS_CONTROL_IN:
+	case ACCESS_CONTROL_OUT:
+	case INQUIRY:
+	case LOG_SENSE:
+	case READ_MEDIA_SERIAL_NUMBER:
+	case REPORT_LUNS:
+	case REQUEST_SENSE:
+		ret = 0; /*/ Allowed CDBs */
+		break;
+	default:
+		other_cdb = 1;
+		break;
+	}
+	/*
+	 * Case where the CDB is explictly allowed in the above switch
+	 * statement.
+	 */
+	if (!(ret) && !(other_cdb)) {
+#if 0
+		printk(KERN_INFO "Allowing explict CDB: 0x%02x for %s"
+			" reservation holder\n", cdb[0],
+			core_scsi3_pr_dump_type(pr_reg_type));
+#endif
+		return ret;
+	}
+	/*
+	 * Check if write exclusive initiator ports *NOT* holding the
+	 * WRITE_EXCLUSIVE_* reservation.
+	 */
+	if ((we) && !(registered_nexus)) {
+		if (cmd->data_direction == DMA_TO_DEVICE) {
+			/*
+			 * Conflict for write exclusive
+			 */
+			printk(KERN_INFO "%s Conflict for unregistered nexus"
+				" %s CDB: 0x%02x to %s reservation\n",
+				transport_dump_cmd_direction(cmd),
+				se_sess->se_node_acl->initiatorname, cdb[0],
+				core_scsi3_pr_dump_type(pr_reg_type));
+			return 1;
+		} else {
+			/*
+			 * Allow non WRITE CDBs for all Write Exclusive
+			 * PR TYPEs to pass for registered and
+			 * non-registered_nexuxes NOT holding the reservation.
+			 *
+			 * We only make noise for the unregisterd nexuses,
+			 * as we expect registered non-reservation holding
+			 * nexuses to issue CDBs.
+			 */
+#if 0
+			if (!(registered_nexus)) {
+				printk(KERN_INFO "Allowing implict CDB: 0x%02x"
+					" for %s reservation on unregistered"
+					" nexus\n", cdb[0],
+					core_scsi3_pr_dump_type(pr_reg_type));
+			}
+#endif
+			return 0;
+		}
+	} else if ((reg_only) || (all_reg)) {
+		if (registered_nexus) {
+			/*
+			 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
+			 * allow commands from registered nexuses.
+			 */
+#if 0
+			printk(KERN_INFO "Allowing implict CDB: 0x%02x for %s"
+				" reservation\n", cdb[0],
+				core_scsi3_pr_dump_type(pr_reg_type));
+#endif
+			return 0;
+		}
+	}
+	printk(KERN_INFO "%s Conflict for %sregistered nexus %s CDB: 0x%2x"
+		" for %s reservation\n", transport_dump_cmd_direction(cmd),
+		(registered_nexus) ? "" : "un",
+		se_sess->se_node_acl->initiatorname, cdb[0],
+		core_scsi3_pr_dump_type(pr_reg_type));
+
+	return 1; /* Conflict by default */
+}
+
+static u32 core_scsi3_pr_generation(struct se_device *dev)
+{
+	struct se_subsystem_dev *su_dev = SU_DEV(dev);
+	u32 prg;
+	/*
+	 * PRGeneration field shall contain the value of a 32-bit wrapping
+	 * counter mainted by the device server.
+	 *
+	 * Note that this is done regardless of Active Persist across
+	 * Target PowerLoss (APTPL)
+	 *
+	 * See spc4r17 section 6.3.12 READ_KEYS service action
+	 */
+	spin_lock(&dev->dev_reservation_lock);
+	prg = T10_RES(su_dev)->pr_generation++;
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return prg;
+}
+
+static int core_scsi3_pr_reservation_check(
+	struct se_cmd *cmd,
+	u32 *pr_reg_type)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_session *sess = cmd->se_sess;
+	int ret;
+
+	if (!(sess))
+		return 0;
+	/*
+	 * A legacy SPC-2 reservation is being held.
+	 */
+	if (dev->dev_flags & DF_SPC2_RESERVATIONS)
+		return core_scsi2_reservation_check(cmd, pr_reg_type);
+
+	spin_lock(&dev->dev_reservation_lock);
+	if (!(dev->dev_pr_res_holder)) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return 0;
+	}
+	*pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
+	cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
+	if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return -1;
+	}
+	if (!(dev->dev_pr_res_holder->isid_present_at_reg)) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return 0;
+	}
+	ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
+	       sess->sess_bin_isid) ? 0 : -1;
+	/*
+	 * Use bit in *pr_reg_type to notify ISID mismatch in
+	 * core_scsi3_pr_seq_non_holder().
+	 */
+	if (ret != 0)
+		*pr_reg_type |= 0x80000000;
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return ret;
+}
+
+static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
+	struct se_device *dev,
+	struct se_node_acl *nacl,
+	struct se_dev_entry *deve,
+	unsigned char *isid,
+	u64 sa_res_key,
+	int all_tg_pt,
+	int aptpl)
+{
+	struct se_subsystem_dev *su_dev = SU_DEV(dev);
+	struct t10_pr_registration *pr_reg;
+
+	pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
+	if (!(pr_reg)) {
+		printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n");
+		return NULL;
+	}
+
+	pr_reg->pr_aptpl_buf = kzalloc(T10_RES(su_dev)->pr_aptpl_buf_len,
+					GFP_ATOMIC);
+	if (!(pr_reg->pr_aptpl_buf)) {
+		printk(KERN_ERR "Unable to allocate pr_reg->pr_aptpl_buf\n");
+		kmem_cache_free(t10_pr_reg_cache, pr_reg);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&pr_reg->pr_reg_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
+	atomic_set(&pr_reg->pr_res_holders, 0);
+	pr_reg->pr_reg_nacl = nacl;
+	pr_reg->pr_reg_deve = deve;
+	pr_reg->pr_res_mapped_lun = deve->mapped_lun;
+	pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
+	pr_reg->pr_res_key = sa_res_key;
+	pr_reg->pr_reg_all_tg_pt = all_tg_pt;
+	pr_reg->pr_reg_aptpl = aptpl;
+	pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
+	/*
+	 * If an ISID value for this SCSI Initiator Port exists,
+	 * save it to the registration now.
+	 */
+	if (isid != NULL) {
+		pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
+		snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
+		pr_reg->isid_present_at_reg = 1;
+	}
+
+	return pr_reg;
+}
+
+static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
+static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
+
+/*
+ * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
+ * modes.
+ */
+static struct t10_pr_registration *__core_scsi3_alloc_registration(
+	struct se_device *dev,
+	struct se_node_acl *nacl,
+	struct se_dev_entry *deve,
+	unsigned char *isid,
+	u64 sa_res_key,
+	int all_tg_pt,
+	int aptpl)
+{
+	struct se_dev_entry *deve_tmp;
+	struct se_node_acl *nacl_tmp;
+	struct se_port *port, *port_tmp;
+	struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
+	struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
+	int ret;
+	/*
+	 * Create a registration for the I_T Nexus upon which the
+	 * PROUT REGISTER was received.
+	 */
+	pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
+			sa_res_key, all_tg_pt, aptpl);
+	if (!(pr_reg))
+		return NULL;
+	/*
+	 * Return pointer to pr_reg for ALL_TG_PT=0
+	 */
+	if (!(all_tg_pt))
+		return pr_reg;
+	/*
+	 * Create list of matching SCSI Initiator Port registrations
+	 * for ALL_TG_PT=1
+	 */
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
+		atomic_inc(&port->sep_tg_pt_ref_cnt);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&dev->se_port_lock);
+
+		spin_lock_bh(&port->sep_alua_lock);
+		list_for_each_entry(deve_tmp, &port->sep_alua_list,
+					alua_port_list) {
+			/*
+			 * This pointer will be NULL for demo mode MappedLUNs
+			 * that have not been make explict via a ConfigFS
+			 * MappedLUN group for the SCSI Initiator Node ACL.
+			 */
+			if (!(deve_tmp->se_lun_acl))
+				continue;
+
+			nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
+			/*
+			 * Skip the matching struct se_node_acl that is allocated
+			 * above..
+			 */
+			if (nacl == nacl_tmp)
+				continue;
+			/*
+			 * Only perform PR registrations for target ports on
+			 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
+			 * arrived.
+			 */
+			if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
+				continue;
+			/*
+			 * Look for a matching Initiator Node ACL in ASCII format
+			 */
+			if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
+				continue;
+
+			atomic_inc(&deve_tmp->pr_ref_count);
+			smp_mb__after_atomic_inc();
+			spin_unlock_bh(&port->sep_alua_lock);
+			/*
+			 * Grab a configfs group dependency that is released
+			 * for the exception path at label out: below, or upon
+			 * completion of adding ALL_TG_PT=1 registrations in
+			 * __core_scsi3_add_registration()
+			 */
+			ret = core_scsi3_lunacl_depend_item(deve_tmp);
+			if (ret < 0) {
+				printk(KERN_ERR "core_scsi3_lunacl_depend"
+						"_item() failed\n");
+				atomic_dec(&port->sep_tg_pt_ref_cnt);
+				smp_mb__after_atomic_dec();
+				atomic_dec(&deve_tmp->pr_ref_count);
+				smp_mb__after_atomic_dec();
+				goto out;
+			}
+			/*
+			 * Located a matching SCSI Initiator Port on a different
+			 * port, allocate the pr_reg_atp and attach it to the
+			 * pr_reg->pr_reg_atp_list that will be processed once
+			 * the original *pr_reg is processed in
+			 * __core_scsi3_add_registration()
+			 */
+			pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
+						nacl_tmp, deve_tmp, NULL,
+						sa_res_key, all_tg_pt, aptpl);
+			if (!(pr_reg_atp)) {
+				atomic_dec(&port->sep_tg_pt_ref_cnt);
+				smp_mb__after_atomic_dec();
+				atomic_dec(&deve_tmp->pr_ref_count);
+				smp_mb__after_atomic_dec();
+				core_scsi3_lunacl_undepend_item(deve_tmp);
+				goto out;
+			}
+
+			list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
+				      &pr_reg->pr_reg_atp_list);
+			spin_lock_bh(&port->sep_alua_lock);
+		}
+		spin_unlock_bh(&port->sep_alua_lock);
+
+		spin_lock(&dev->se_port_lock);
+		atomic_dec(&port->sep_tg_pt_ref_cnt);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	return pr_reg;
+out:
+	list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
+			&pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
+		list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
+		core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
+		kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
+	}
+	kmem_cache_free(t10_pr_reg_cache, pr_reg);
+	return NULL;
+}
+
+int core_scsi3_alloc_aptpl_registration(
+	struct t10_reservation_template *pr_tmpl,
+	u64 sa_res_key,
+	unsigned char *i_port,
+	unsigned char *isid,
+	u32 mapped_lun,
+	unsigned char *t_port,
+	u16 tpgt,
+	u32 target_lun,
+	int res_holder,
+	int all_tg_pt,
+	u8 type)
+{
+	struct t10_pr_registration *pr_reg;
+
+	if (!(i_port) || !(t_port) || !(sa_res_key)) {
+		printk(KERN_ERR "Illegal parameters for APTPL registration\n");
+		return -1;
+	}
+
+	pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
+	if (!(pr_reg)) {
+		printk(KERN_ERR "Unable to allocate struct t10_pr_registration\n");
+		return -1;
+	}
+	pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
+
+	INIT_LIST_HEAD(&pr_reg->pr_reg_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
+	INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
+	atomic_set(&pr_reg->pr_res_holders, 0);
+	pr_reg->pr_reg_nacl = NULL;
+	pr_reg->pr_reg_deve = NULL;
+	pr_reg->pr_res_mapped_lun = mapped_lun;
+	pr_reg->pr_aptpl_target_lun = target_lun;
+	pr_reg->pr_res_key = sa_res_key;
+	pr_reg->pr_reg_all_tg_pt = all_tg_pt;
+	pr_reg->pr_reg_aptpl = 1;
+	pr_reg->pr_reg_tg_pt_lun = NULL;
+	pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
+	pr_reg->pr_res_type = type;
+	/*
+	 * If an ISID value had been saved in APTPL metadata for this
+	 * SCSI Initiator Port, restore it now.
+	 */
+	if (isid != NULL) {
+		pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
+		snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
+		pr_reg->isid_present_at_reg = 1;
+	}
+	/*
+	 * Copy the i_port and t_port information from caller.
+	 */
+	snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
+	snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
+	pr_reg->pr_reg_tpgt = tpgt;
+	/*
+	 * Set pr_res_holder from caller, the pr_reg who is the reservation
+	 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
+	 * the Initiator Node LUN ACL from the fabric module is created for
+	 * this registration.
+	 */
+	pr_reg->pr_res_holder = res_holder;
+
+	list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
+	printk(KERN_INFO "SPC-3 PR APTPL Successfully added registration%s from"
+			" metadata\n", (res_holder) ? "+reservation" : "");
+	return 0;
+}
+
+static void core_scsi3_aptpl_reserve(
+	struct se_device *dev,
+	struct se_portal_group *tpg,
+	struct se_node_acl *node_acl,
+	struct t10_pr_registration *pr_reg)
+{
+	char i_buf[PR_REG_ISID_ID_LEN];
+	int prf_isid;
+
+	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+
+	spin_lock(&dev->dev_reservation_lock);
+	dev->dev_pr_res_holder = pr_reg;
+	spin_unlock(&dev->dev_reservation_lock);
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: APTPL RESERVE created"
+		" new reservation holder TYPE: %s ALL_TG_PT: %d\n",
+		TPG_TFO(tpg)->get_fabric_name(),
+		core_scsi3_pr_dump_type(pr_reg->pr_res_type),
+		(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
+	printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n",
+		TPG_TFO(tpg)->get_fabric_name(), node_acl->initiatorname,
+		(prf_isid) ? &i_buf[0] : "");
+}
+
+static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
+				struct t10_pr_registration *, int, int);
+
+static int __core_scsi3_check_aptpl_registration(
+	struct se_device *dev,
+	struct se_portal_group *tpg,
+	struct se_lun *lun,
+	u32 target_lun,
+	struct se_node_acl *nacl,
+	struct se_dev_entry *deve)
+{
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
+	unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
+	u16 tpgt;
+
+	memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
+	memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
+	/*
+	 * Copy Initiator Port information from struct se_node_acl
+	 */
+	snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
+	snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
+			TPG_TFO(tpg)->tpg_get_wwn(tpg));
+	tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg);
+	/*
+	 * Look for the matching registrations+reservation from those
+	 * created from APTPL metadata.  Note that multiple registrations
+	 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
+	 * TransportIDs.
+	 */
+	spin_lock(&pr_tmpl->aptpl_reg_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
+				pr_reg_aptpl_list) {
+		if (!(strcmp(pr_reg->pr_iport, i_port)) &&
+		     (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
+		    !(strcmp(pr_reg->pr_tport, t_port)) &&
+		     (pr_reg->pr_reg_tpgt == tpgt) &&
+		     (pr_reg->pr_aptpl_target_lun == target_lun)) {
+
+			pr_reg->pr_reg_nacl = nacl;
+			pr_reg->pr_reg_deve = deve;
+			pr_reg->pr_reg_tg_pt_lun = lun;
+
+			list_del(&pr_reg->pr_reg_aptpl_list);
+			spin_unlock(&pr_tmpl->aptpl_reg_lock);
+			/*
+			 * At this point all of the pointers in *pr_reg will
+			 * be setup, so go ahead and add the registration.
+			 */
+
+			__core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
+			/*
+			 * If this registration is the reservation holder,
+			 * make that happen now..
+			 */
+			if (pr_reg->pr_res_holder)
+				core_scsi3_aptpl_reserve(dev, tpg,
+						nacl, pr_reg);
+			/*
+			 * Reenable pr_aptpl_active to accept new metadata
+			 * updates once the SCSI device is active again..
+			 */
+			spin_lock(&pr_tmpl->aptpl_reg_lock);
+			pr_tmpl->pr_aptpl_active = 1;
+		}
+	}
+	spin_unlock(&pr_tmpl->aptpl_reg_lock);
+
+	return 0;
+}
+
+int core_scsi3_check_aptpl_registration(
+	struct se_device *dev,
+	struct se_portal_group *tpg,
+	struct se_lun *lun,
+	struct se_lun_acl *lun_acl)
+{
+	struct se_subsystem_dev *su_dev = SU_DEV(dev);
+	struct se_node_acl *nacl = lun_acl->se_lun_nacl;
+	struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];
+
+	if (T10_RES(su_dev)->res_type != SPC3_PERSISTENT_RESERVATIONS)
+		return 0;
+
+	return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
+				lun->unpacked_lun, nacl, deve);
+}
+
+static void __core_scsi3_dump_registration(
+	struct target_core_fabric_ops *tfo,
+	struct se_device *dev,
+	struct se_node_acl *nacl,
+	struct t10_pr_registration *pr_reg,
+	int register_type)
+{
+	struct se_portal_group *se_tpg = nacl->se_tpg;
+	char i_buf[PR_REG_ISID_ID_LEN];
+	int prf_isid;
+
+	memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
+		" Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
+		"_AND_MOVE" : (register_type == 1) ?
+		"_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
+		(prf_isid) ? i_buf : "");
+	printk(KERN_INFO "SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
+		 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
+		tfo->tpg_get_tag(se_tpg));
+	printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
+		" Port(s)\n",  tfo->get_fabric_name(),
+		(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
+		TRANSPORT(dev)->name);
+	printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
+		" 0x%08x  APTPL: %d\n", tfo->get_fabric_name(),
+		pr_reg->pr_res_key, pr_reg->pr_res_generation,
+		pr_reg->pr_reg_aptpl);
+}
+
+/*
+ * this function can be called with struct se_device->dev_reservation_lock
+ * when register_move = 1
+ */
+static void __core_scsi3_add_registration(
+	struct se_device *dev,
+	struct se_node_acl *nacl,
+	struct t10_pr_registration *pr_reg,
+	int register_type,
+	int register_move)
+{
+	struct se_subsystem_dev *su_dev = SU_DEV(dev);
+	struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
+	struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+
+	/*
+	 * Increment PRgeneration counter for struct se_device upon a successful
+	 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
+	 *
+	 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
+	 * action, the struct se_device->dev_reservation_lock will already be held,
+	 * so we do not call core_scsi3_pr_generation() which grabs the lock
+	 * for the REGISTER.
+	 */
+	pr_reg->pr_res_generation = (register_move) ?
+			T10_RES(su_dev)->pr_generation++ :
+			core_scsi3_pr_generation(dev);
+
+	spin_lock(&pr_tmpl->registration_lock);
+	list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
+	pr_reg->pr_reg_deve->def_pr_registered = 1;
+
+	__core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
+	spin_unlock(&pr_tmpl->registration_lock);
+	/*
+	 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
+	 */
+	if (!(pr_reg->pr_reg_all_tg_pt) || (register_move))
+		return;
+	/*
+	 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
+	 * allocated in __core_scsi3_alloc_registration()
+	 */
+	list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
+			&pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
+		list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
+
+		pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
+
+		spin_lock(&pr_tmpl->registration_lock);
+		list_add_tail(&pr_reg_tmp->pr_reg_list,
+			      &pr_tmpl->registration_list);
+		pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
+
+		__core_scsi3_dump_registration(tfo, dev,
+				pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
+				register_type);
+		spin_unlock(&pr_tmpl->registration_lock);
+		/*
+		 * Drop configfs group dependency reference from
+		 * __core_scsi3_alloc_registration()
+		 */
+		core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
+	}
+}
+
+static int core_scsi3_alloc_registration(
+	struct se_device *dev,
+	struct se_node_acl *nacl,
+	struct se_dev_entry *deve,
+	unsigned char *isid,
+	u64 sa_res_key,
+	int all_tg_pt,
+	int aptpl,
+	int register_type,
+	int register_move)
+{
+	struct t10_pr_registration *pr_reg;
+
+	pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
+			sa_res_key, all_tg_pt, aptpl);
+	if (!(pr_reg))
+		return -1;
+
+	__core_scsi3_add_registration(dev, nacl, pr_reg,
+			register_type, register_move);
+	return 0;
+}
+
+static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
+	struct se_device *dev,
+	struct se_node_acl *nacl,
+	unsigned char *isid)
+{
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp;
+	struct se_portal_group *tpg;
+
+	spin_lock(&pr_tmpl->registration_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+			&pr_tmpl->registration_list, pr_reg_list) {
+		/*
+		 * First look for a matching struct se_node_acl
+		 */
+		if (pr_reg->pr_reg_nacl != nacl)
+			continue;
+
+		tpg = pr_reg->pr_reg_nacl->se_tpg;
+		/*
+		 * If this registration does NOT contain a fabric provided
+		 * ISID, then we have found a match.
+		 */
+		if (!(pr_reg->isid_present_at_reg)) {
+			/*
+			 * Determine if this SCSI device server requires that
+			 * SCSI Intiatior TransportID w/ ISIDs is enforced
+			 * for fabric modules (iSCSI) requiring them.
+			 */
+			if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) {
+				if (DEV_ATTRIB(dev)->enforce_pr_isids)
+					continue;
+			}
+			atomic_inc(&pr_reg->pr_res_holders);
+			smp_mb__after_atomic_inc();
+			spin_unlock(&pr_tmpl->registration_lock);
+			return pr_reg;
+		}
+		/*
+		 * If the *pr_reg contains a fabric defined ISID for multi-value
+		 * SCSI Initiator Port TransportIDs, then we expect a valid
+		 * matching ISID to be provided by the local SCSI Initiator Port.
+		 */
+		if (!(isid))
+			continue;
+		if (strcmp(isid, pr_reg->pr_reg_isid))
+			continue;
+
+		atomic_inc(&pr_reg->pr_res_holders);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&pr_tmpl->registration_lock);
+		return pr_reg;
+	}
+	spin_unlock(&pr_tmpl->registration_lock);
+
+	return NULL;
+}
+
+static struct t10_pr_registration *core_scsi3_locate_pr_reg(
+	struct se_device *dev,
+	struct se_node_acl *nacl,
+	struct se_session *sess)
+{
+	struct se_portal_group *tpg = nacl->se_tpg;
+	unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
+
+	if (TPG_TFO(tpg)->sess_get_initiator_sid != NULL) {
+		memset(&buf[0], 0, PR_REG_ISID_LEN);
+		TPG_TFO(tpg)->sess_get_initiator_sid(sess, &buf[0],
+					PR_REG_ISID_LEN);
+		isid_ptr = &buf[0];
+	}
+
+	return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
+}
+
+static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
+{
+	atomic_dec(&pr_reg->pr_res_holders);
+	smp_mb__after_atomic_dec();
+}
+
+static int core_scsi3_check_implict_release(
+	struct se_device *dev,
+	struct t10_pr_registration *pr_reg)
+{
+	struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
+	struct t10_pr_registration *pr_res_holder;
+	int ret = 0;
+
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if (!(pr_res_holder)) {
+		spin_unlock(&dev->dev_reservation_lock);
+		return ret;
+	}
+	if (pr_res_holder == pr_reg) {
+		/*
+		 * Perform an implict RELEASE if the registration that
+		 * is being released is holding the reservation.
+		 *
+		 * From spc4r17, section 5.7.11.1:
+		 *
+		 * e) If the I_T nexus is the persistent reservation holder
+		 *    and the persistent reservation is not an all registrants
+		 *    type, then a PERSISTENT RESERVE OUT command with REGISTER
+		 *    service action or REGISTER AND  IGNORE EXISTING KEY
+		 *    service action with the SERVICE ACTION RESERVATION KEY
+		 *    field set to zero (see 5.7.11.3).
+		 */
+		__core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
+		ret = 1;
+		/*
+		 * For 'All Registrants' reservation types, all existing
+		 * registrations are still processed as reservation holders
+		 * in core_scsi3_pr_seq_non_holder() after the initial
+		 * reservation holder is implictly released here.
+		 */
+	} else if (pr_reg->pr_reg_all_tg_pt &&
+		  (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
+			  pr_reg->pr_reg_nacl->initiatorname)) &&
+		  (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
+		printk(KERN_ERR "SPC-3 PR: Unable to perform ALL_TG_PT=1"
+			" UNREGISTER while existing reservation with matching"
+			" key 0x%016Lx is present from another SCSI Initiator"
+			" Port\n", pr_reg->pr_res_key);
+		ret = -1;
+	}
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return ret;
+}
+
+/*
+ * Called with struct t10_reservation_template->registration_lock held.
+ */
+static void __core_scsi3_free_registration(
+	struct se_device *dev,
+	struct t10_pr_registration *pr_reg,
+	struct list_head *preempt_and_abort_list,
+	int dec_holders)
+{
+	struct target_core_fabric_ops *tfo =
+			pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	char i_buf[PR_REG_ISID_ID_LEN];
+	int prf_isid;
+
+	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+
+	pr_reg->pr_reg_deve->def_pr_registered = 0;
+	pr_reg->pr_reg_deve->pr_res_key = 0;
+	list_del(&pr_reg->pr_reg_list);
+	/*
+	 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
+	 * so call core_scsi3_put_pr_reg() to decrement our reference.
+	 */
+	if (dec_holders)
+		core_scsi3_put_pr_reg(pr_reg);
+	/*
+	 * Wait until all reference from any other I_T nexuses for this
+	 * *pr_reg have been released.  Because list_del() is called above,
+	 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
+	 * count back to zero, and we release *pr_reg.
+	 */
+	while (atomic_read(&pr_reg->pr_res_holders) != 0) {
+		spin_unlock(&pr_tmpl->registration_lock);
+		printk("SPC-3 PR [%s] waiting for pr_res_holders\n",
+				tfo->get_fabric_name());
+		cpu_relax();
+		spin_lock(&pr_tmpl->registration_lock);
+	}
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
+		" Node: %s%s\n", tfo->get_fabric_name(),
+		pr_reg->pr_reg_nacl->initiatorname,
+		(prf_isid) ? &i_buf[0] : "");
+	printk(KERN_INFO "SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
+		" Port(s)\n", tfo->get_fabric_name(),
+		(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
+		TRANSPORT(dev)->name);
+	printk(KERN_INFO "SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
+		" 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
+		pr_reg->pr_res_generation);
+
+	if (!(preempt_and_abort_list)) {
+		pr_reg->pr_reg_deve = NULL;
+		pr_reg->pr_reg_nacl = NULL;
+		kfree(pr_reg->pr_aptpl_buf);
+		kmem_cache_free(t10_pr_reg_cache, pr_reg);
+		return;
+	}
+	/*
+	 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
+	 * are released once the ABORT_TASK_SET has completed..
+	 */
+	list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
+}
+
+void core_scsi3_free_pr_reg_from_nacl(
+	struct se_device *dev,
+	struct se_node_acl *nacl)
+{
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
+	/*
+	 * If the passed se_node_acl matches the reservation holder,
+	 * release the reservation.
+	 */
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if ((pr_res_holder != NULL) &&
+	    (pr_res_holder->pr_reg_nacl == nacl))
+		__core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
+	spin_unlock(&dev->dev_reservation_lock);
+	/*
+	 * Release any registration associated with the struct se_node_acl.
+	 */
+	spin_lock(&pr_tmpl->registration_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+			&pr_tmpl->registration_list, pr_reg_list) {
+
+		if (pr_reg->pr_reg_nacl != nacl)
+			continue;
+
+		__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
+	}
+	spin_unlock(&pr_tmpl->registration_lock);
+}
+
+void core_scsi3_free_all_registrations(
+	struct se_device *dev)
+{
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
+
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if (pr_res_holder != NULL) {
+		struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
+		__core_scsi3_complete_pro_release(dev, pr_res_nacl,
+				pr_res_holder, 0);
+	}
+	spin_unlock(&dev->dev_reservation_lock);
+
+	spin_lock(&pr_tmpl->registration_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+			&pr_tmpl->registration_list, pr_reg_list) {
+
+		__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
+	}
+	spin_unlock(&pr_tmpl->registration_lock);
+
+	spin_lock(&pr_tmpl->aptpl_reg_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
+				pr_reg_aptpl_list) {
+		list_del(&pr_reg->pr_reg_aptpl_list);
+		kfree(pr_reg->pr_aptpl_buf);
+		kmem_cache_free(t10_pr_reg_cache, pr_reg);
+	}
+	spin_unlock(&pr_tmpl->aptpl_reg_lock);
+}
+
+static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
+{
+	return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
+			&tpg->tpg_group.cg_item);
+}
+
+static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
+{
+	configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
+			&tpg->tpg_group.cg_item);
+
+	atomic_dec(&tpg->tpg_pr_ref_count);
+	smp_mb__after_atomic_dec();
+}
+
+static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
+{
+	struct se_portal_group *tpg = nacl->se_tpg;
+
+	if (nacl->dynamic_node_acl)
+		return 0;
+
+	return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
+			&nacl->acl_group.cg_item);
+}
+
+static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
+{
+	struct se_portal_group *tpg = nacl->se_tpg;
+
+	if (nacl->dynamic_node_acl) {
+		atomic_dec(&nacl->acl_pr_ref_count);
+		smp_mb__after_atomic_dec();
+		return;
+	}
+
+	configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
+			&nacl->acl_group.cg_item);
+
+	atomic_dec(&nacl->acl_pr_ref_count);
+	smp_mb__after_atomic_dec();
+}
+
+static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
+{
+	struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
+	struct se_node_acl *nacl;
+	struct se_portal_group *tpg;
+	/*
+	 * For nacl->dynamic_node_acl=1
+	 */
+	if (!(lun_acl))
+		return 0;
+
+	nacl = lun_acl->se_lun_nacl;
+	tpg = nacl->se_tpg;
+
+	return configfs_depend_item(TPG_TFO(tpg)->tf_subsys,
+			&lun_acl->se_lun_group.cg_item);
+}
+
+static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
+{
+	struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
+	struct se_node_acl *nacl;
+	struct se_portal_group *tpg;
+	/*
+	 * For nacl->dynamic_node_acl=1
+	 */
+	if (!(lun_acl)) {
+		atomic_dec(&se_deve->pr_ref_count);
+		smp_mb__after_atomic_dec();
+		return;
+	}
+	nacl = lun_acl->se_lun_nacl;
+	tpg = nacl->se_tpg;
+
+	configfs_undepend_item(TPG_TFO(tpg)->tf_subsys,
+			&lun_acl->se_lun_group.cg_item);
+
+	atomic_dec(&se_deve->pr_ref_count);
+	smp_mb__after_atomic_dec();
+}
+
+static int core_scsi3_decode_spec_i_port(
+	struct se_cmd *cmd,
+	struct se_portal_group *tpg,
+	unsigned char *l_isid,
+	u64 sa_res_key,
+	int all_tg_pt,
+	int aptpl)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_port *tmp_port;
+	struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
+	struct se_session *se_sess = SE_SESS(cmd);
+	struct se_node_acl *dest_node_acl = NULL;
+	struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
+	struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
+	struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
+	struct list_head tid_dest_list;
+	struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
+	struct target_core_fabric_ops *tmp_tf_ops;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
+	char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
+	u32 tpdl, tid_len = 0;
+	int ret, dest_local_nexus, prf_isid;
+	u32 dest_rtpi = 0;
+
+	memset(dest_iport, 0, 64);
+	INIT_LIST_HEAD(&tid_dest_list);
+
+	local_se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
+	/*
+	 * Allocate a struct pr_transport_id_holder and setup the
+	 * local_node_acl and local_se_deve pointers and add to
+	 * struct list_head tid_dest_list for add registration
+	 * processing in the loop of tid_dest_list below.
+	 */
+	tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
+	if (!(tidh_new)) {
+		printk(KERN_ERR "Unable to allocate tidh_new\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	INIT_LIST_HEAD(&tidh_new->dest_list);
+	tidh_new->dest_tpg = tpg;
+	tidh_new->dest_node_acl = se_sess->se_node_acl;
+	tidh_new->dest_se_deve = local_se_deve;
+
+	local_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd),
+				se_sess->se_node_acl, local_se_deve, l_isid,
+				sa_res_key, all_tg_pt, aptpl);
+	if (!(local_pr_reg)) {
+		kfree(tidh_new);
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	tidh_new->dest_pr_reg = local_pr_reg;
+	/*
+	 * The local I_T nexus does not hold any configfs dependances,
+	 * so we set tid_h->dest_local_nexus=1 to prevent the
+	 * configfs_undepend_item() calls in the tid_dest_list loops below.
+	 */
+	tidh_new->dest_local_nexus = 1;
+	list_add_tail(&tidh_new->dest_list, &tid_dest_list);
+	/*
+	 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
+	 * first extract TransportID Parameter Data Length, and make sure
+	 * the value matches up to the SCSI expected data transfer length.
+	 */
+	tpdl = (buf[24] & 0xff) << 24;
+	tpdl |= (buf[25] & 0xff) << 16;
+	tpdl |= (buf[26] & 0xff) << 8;
+	tpdl |= buf[27] & 0xff;
+
+	if ((tpdl + 28) != cmd->data_length) {
+		printk(KERN_ERR "SPC-3 PR: Illegal tpdl: %u + 28 byte header"
+			" does not equal CDB data_length: %u\n", tpdl,
+			cmd->data_length);
+		ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		goto out;
+	}
+	/*
+	 * Start processing the received transport IDs using the
+	 * receiving I_T Nexus portal's fabric dependent methods to
+	 * obtain the SCSI Initiator Port/Device Identifiers.
+	 */
+	ptr = &buf[28];
+
+	while (tpdl > 0) {
+		proto_ident = (ptr[0] & 0x0f);
+		dest_tpg = NULL;
+
+		spin_lock(&dev->se_port_lock);
+		list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
+			tmp_tpg = tmp_port->sep_tpg;
+			if (!(tmp_tpg))
+				continue;
+			tmp_tf_ops = TPG_TFO(tmp_tpg);
+			if (!(tmp_tf_ops))
+				continue;
+			if (!(tmp_tf_ops->get_fabric_proto_ident) ||
+			    !(tmp_tf_ops->tpg_parse_pr_out_transport_id))
+				continue;
+			/*
+			 * Look for the matching proto_ident provided by
+			 * the received TransportID
+			 */
+			tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
+			if (tmp_proto_ident != proto_ident)
+				continue;
+			dest_rtpi = tmp_port->sep_rtpi;
+
+			i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
+					tmp_tpg, (const char *)ptr, &tid_len,
+					&iport_ptr);
+			if (!(i_str))
+				continue;
+
+			atomic_inc(&tmp_tpg->tpg_pr_ref_count);
+			smp_mb__after_atomic_inc();
+			spin_unlock(&dev->se_port_lock);
+
+			ret = core_scsi3_tpg_depend_item(tmp_tpg);
+			if (ret != 0) {
+				printk(KERN_ERR " core_scsi3_tpg_depend_item()"
+					" for tmp_tpg\n");
+				atomic_dec(&tmp_tpg->tpg_pr_ref_count);
+				smp_mb__after_atomic_dec();
+				ret = PYX_TRANSPORT_LU_COMM_FAILURE;
+				goto out;
+			}
+			/*
+			 * Locate the desination initiator ACL to be registered
+			 * from the decoded fabric module specific TransportID
+			 * at *i_str.
+			 */
+			spin_lock_bh(&tmp_tpg->acl_node_lock);
+			dest_node_acl = __core_tpg_get_initiator_node_acl(
+						tmp_tpg, i_str);
+			if (dest_node_acl) {
+				atomic_inc(&dest_node_acl->acl_pr_ref_count);
+				smp_mb__after_atomic_inc();
+			}
+			spin_unlock_bh(&tmp_tpg->acl_node_lock);
+
+			if (!(dest_node_acl)) {
+				core_scsi3_tpg_undepend_item(tmp_tpg);
+				spin_lock(&dev->se_port_lock);
+				continue;
+			}
+
+			ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
+			if (ret != 0) {
+				printk(KERN_ERR "configfs_depend_item() failed"
+					" for dest_node_acl->acl_group\n");
+				atomic_dec(&dest_node_acl->acl_pr_ref_count);
+				smp_mb__after_atomic_dec();
+				core_scsi3_tpg_undepend_item(tmp_tpg);
+				ret = PYX_TRANSPORT_LU_COMM_FAILURE;
+				goto out;
+			}
+
+			dest_tpg = tmp_tpg;
+			printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node:"
+				" %s Port RTPI: %hu\n",
+				TPG_TFO(dest_tpg)->get_fabric_name(),
+				dest_node_acl->initiatorname, dest_rtpi);
+
+			spin_lock(&dev->se_port_lock);
+			break;
+		}
+		spin_unlock(&dev->se_port_lock);
+
+		if (!(dest_tpg)) {
+			printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Unable to locate"
+					" dest_tpg\n");
+			ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+			goto out;
+		}
+#if 0
+		printk("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
+			" tid_len: %d for %s + %s\n",
+			TPG_TFO(dest_tpg)->get_fabric_name(), cmd->data_length,
+			tpdl, tid_len, i_str, iport_ptr);
+#endif
+		if (tid_len > tpdl) {
+			printk(KERN_ERR "SPC-3 PR SPEC_I_PT: Illegal tid_len:"
+				" %u for Transport ID: %s\n", tid_len, ptr);
+			core_scsi3_nodeacl_undepend_item(dest_node_acl);
+			core_scsi3_tpg_undepend_item(dest_tpg);
+			ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+			goto out;
+		}
+		/*
+		 * Locate the desintation struct se_dev_entry pointer for matching
+		 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
+		 * Target Port.
+		 */
+		dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
+					dest_rtpi);
+		if (!(dest_se_deve)) {
+			printk(KERN_ERR "Unable to locate %s dest_se_deve"
+				" from destination RTPI: %hu\n",
+				TPG_TFO(dest_tpg)->get_fabric_name(),
+				dest_rtpi);
+
+			core_scsi3_nodeacl_undepend_item(dest_node_acl);
+			core_scsi3_tpg_undepend_item(dest_tpg);
+			ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+			goto out;
+		}
+
+		ret = core_scsi3_lunacl_depend_item(dest_se_deve);
+		if (ret < 0) {
+			printk(KERN_ERR "core_scsi3_lunacl_depend_item()"
+					" failed\n");
+			atomic_dec(&dest_se_deve->pr_ref_count);
+			smp_mb__after_atomic_dec();
+			core_scsi3_nodeacl_undepend_item(dest_node_acl);
+			core_scsi3_tpg_undepend_item(dest_tpg);
+			ret = PYX_TRANSPORT_LU_COMM_FAILURE;
+			goto out;
+		}
+#if 0
+		printk(KERN_INFO "SPC-3 PR SPEC_I_PT: Located %s Node: %s"
+			" dest_se_deve mapped_lun: %u\n",
+			TPG_TFO(dest_tpg)->get_fabric_name(),
+			dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
+#endif
+		/*
+		 * Skip any TransportIDs that already have a registration for
+		 * this target port.
+		 */
+		pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
+					iport_ptr);
+		if (pr_reg_e) {
+			core_scsi3_put_pr_reg(pr_reg_e);
+			core_scsi3_lunacl_undepend_item(dest_se_deve);
+			core_scsi3_nodeacl_undepend_item(dest_node_acl);
+			core_scsi3_tpg_undepend_item(dest_tpg);
+			ptr += tid_len;
+			tpdl -= tid_len;
+			tid_len = 0;
+			continue;
+		}
+		/*
+		 * Allocate a struct pr_transport_id_holder and setup
+		 * the dest_node_acl and dest_se_deve pointers for the
+		 * loop below.
+		 */
+		tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
+				GFP_KERNEL);
+		if (!(tidh_new)) {
+			printk(KERN_ERR "Unable to allocate tidh_new\n");
+			core_scsi3_lunacl_undepend_item(dest_se_deve);
+			core_scsi3_nodeacl_undepend_item(dest_node_acl);
+			core_scsi3_tpg_undepend_item(dest_tpg);
+			ret = PYX_TRANSPORT_LU_COMM_FAILURE;
+			goto out;
+		}
+		INIT_LIST_HEAD(&tidh_new->dest_list);
+		tidh_new->dest_tpg = dest_tpg;
+		tidh_new->dest_node_acl = dest_node_acl;
+		tidh_new->dest_se_deve = dest_se_deve;
+
+		/*
+		 * Allocate, but do NOT add the registration for the
+		 * TransportID referenced SCSI Initiator port.  This
+		 * done because of the following from spc4r17 in section
+		 * 6.14.3 wrt SPEC_I_PT:
+		 *
+		 * "If a registration fails for any initiator port (e.g., if th
+		 * logical unit does not have enough resources available to
+		 * hold the registration information), no registrations shall be
+		 * made, and the command shall be terminated with
+		 * CHECK CONDITION status."
+		 *
+		 * That means we call __core_scsi3_alloc_registration() here,
+		 * and then call __core_scsi3_add_registration() in the
+		 * 2nd loop which will never fail.
+		 */
+		dest_pr_reg = __core_scsi3_alloc_registration(SE_DEV(cmd),
+				dest_node_acl, dest_se_deve, iport_ptr,
+				sa_res_key, all_tg_pt, aptpl);
+		if (!(dest_pr_reg)) {
+			core_scsi3_lunacl_undepend_item(dest_se_deve);
+			core_scsi3_nodeacl_undepend_item(dest_node_acl);
+			core_scsi3_tpg_undepend_item(dest_tpg);
+			kfree(tidh_new);
+			ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+			goto out;
+		}
+		tidh_new->dest_pr_reg = dest_pr_reg;
+		list_add_tail(&tidh_new->dest_list, &tid_dest_list);
+
+		ptr += tid_len;
+		tpdl -= tid_len;
+		tid_len = 0;
+
+	}
+	/*
+	 * Go ahead and create a registrations from tid_dest_list for the
+	 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
+	 * and dest_se_deve.
+	 *
+	 * The SA Reservation Key from the PROUT is set for the
+	 * registration, and ALL_TG_PT is also passed.  ALL_TG_PT=1
+	 * means that the TransportID Initiator port will be
+	 * registered on all of the target ports in the SCSI target device
+	 * ALL_TG_PT=0 means the registration will only be for the
+	 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
+	 * was received.
+	 */
+	list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
+		dest_tpg = tidh->dest_tpg;
+		dest_node_acl = tidh->dest_node_acl;
+		dest_se_deve = tidh->dest_se_deve;
+		dest_pr_reg = tidh->dest_pr_reg;
+		dest_local_nexus = tidh->dest_local_nexus;
+
+		list_del(&tidh->dest_list);
+		kfree(tidh);
+
+		memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+		prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
+						PR_REG_ISID_ID_LEN);
+
+		__core_scsi3_add_registration(SE_DEV(cmd), dest_node_acl,
+					dest_pr_reg, 0, 0);
+
+		printk(KERN_INFO "SPC-3 PR [%s] SPEC_I_PT: Successfully"
+			" registered Transport ID for Node: %s%s Mapped LUN:"
+			" %u\n", TPG_TFO(dest_tpg)->get_fabric_name(),
+			dest_node_acl->initiatorname, (prf_isid) ?
+			&i_buf[0] : "", dest_se_deve->mapped_lun);
+
+		if (dest_local_nexus)
+			continue;
+
+		core_scsi3_lunacl_undepend_item(dest_se_deve);
+		core_scsi3_nodeacl_undepend_item(dest_node_acl);
+		core_scsi3_tpg_undepend_item(dest_tpg);
+	}
+
+	return 0;
+out:
+	/*
+	 * For the failure case, release everything from tid_dest_list
+	 * including *dest_pr_reg and the configfs dependances..
+	 */
+	list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
+		dest_tpg = tidh->dest_tpg;
+		dest_node_acl = tidh->dest_node_acl;
+		dest_se_deve = tidh->dest_se_deve;
+		dest_pr_reg = tidh->dest_pr_reg;
+		dest_local_nexus = tidh->dest_local_nexus;
+
+		list_del(&tidh->dest_list);
+		kfree(tidh);
+		/*
+		 * Release any extra ALL_TG_PT=1 registrations for
+		 * the SPEC_I_PT=1 case.
+		 */
+		list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
+				&dest_pr_reg->pr_reg_atp_list,
+				pr_reg_atp_mem_list) {
+			list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
+			core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
+			kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
+		}
+
+		kfree(dest_pr_reg->pr_aptpl_buf);
+		kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
+
+		if (dest_local_nexus)
+			continue;
+
+		core_scsi3_lunacl_undepend_item(dest_se_deve);
+		core_scsi3_nodeacl_undepend_item(dest_node_acl);
+		core_scsi3_tpg_undepend_item(dest_tpg);
+	}
+	return ret;
+}
+
+/*
+ * Called with struct se_device->dev_reservation_lock held
+ */
+static int __core_scsi3_update_aptpl_buf(
+	struct se_device *dev,
+	unsigned char *buf,
+	u32 pr_aptpl_buf_len,
+	int clear_aptpl_metadata)
+{
+	struct se_lun *lun;
+	struct se_portal_group *tpg;
+	struct se_subsystem_dev *su_dev = SU_DEV(dev);
+	struct t10_pr_registration *pr_reg;
+	unsigned char tmp[512], isid_buf[32];
+	ssize_t len = 0;
+	int reg_count = 0;
+
+	memset(buf, 0, pr_aptpl_buf_len);
+	/*
+	 * Called to clear metadata once APTPL has been deactivated.
+	 */
+	if (clear_aptpl_metadata) {
+		snprintf(buf, pr_aptpl_buf_len,
+				"No Registrations or Reservations\n");
+		return 0;
+	}
+	/*
+	 * Walk the registration list..
+	 */
+	spin_lock(&T10_RES(su_dev)->registration_lock);
+	list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list,
+			pr_reg_list) {
+
+		tmp[0] = '\0';
+		isid_buf[0] = '\0';
+		tpg = pr_reg->pr_reg_nacl->se_tpg;
+		lun = pr_reg->pr_reg_tg_pt_lun;
+		/*
+		 * Write out any ISID value to APTPL metadata that was included
+		 * in the original registration.
+		 */
+		if (pr_reg->isid_present_at_reg)
+			snprintf(isid_buf, 32, "initiator_sid=%s\n",
+					pr_reg->pr_reg_isid);
+		/*
+		 * Include special metadata if the pr_reg matches the
+		 * reservation holder.
+		 */
+		if (dev->dev_pr_res_holder == pr_reg) {
+			snprintf(tmp, 512, "PR_REG_START: %d"
+				"\ninitiator_fabric=%s\n"
+				"initiator_node=%s\n%s"
+				"sa_res_key=%llu\n"
+				"res_holder=1\nres_type=%02x\n"
+				"res_scope=%02x\nres_all_tg_pt=%d\n"
+				"mapped_lun=%u\n", reg_count,
+				TPG_TFO(tpg)->get_fabric_name(),
+				pr_reg->pr_reg_nacl->initiatorname, isid_buf,
+				pr_reg->pr_res_key, pr_reg->pr_res_type,
+				pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
+				pr_reg->pr_res_mapped_lun);
+		} else {
+			snprintf(tmp, 512, "PR_REG_START: %d\n"
+				"initiator_fabric=%s\ninitiator_node=%s\n%s"
+				"sa_res_key=%llu\nres_holder=0\n"
+				"res_all_tg_pt=%d\nmapped_lun=%u\n",
+				reg_count, TPG_TFO(tpg)->get_fabric_name(),
+				pr_reg->pr_reg_nacl->initiatorname, isid_buf,
+				pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
+				pr_reg->pr_res_mapped_lun);
+		}
+
+		if ((len + strlen(tmp) > pr_aptpl_buf_len)) {
+			printk(KERN_ERR "Unable to update renaming"
+				" APTPL metadata\n");
+			spin_unlock(&T10_RES(su_dev)->registration_lock);
+			return -1;
+		}
+		len += sprintf(buf+len, "%s", tmp);
+
+		/*
+		 * Include information about the associated SCSI target port.
+		 */
+		snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
+			"tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
+			" %d\n", TPG_TFO(tpg)->get_fabric_name(),
+			TPG_TFO(tpg)->tpg_get_wwn(tpg),
+			TPG_TFO(tpg)->tpg_get_tag(tpg),
+			lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
+
+		if ((len + strlen(tmp) > pr_aptpl_buf_len)) {
+			printk(KERN_ERR "Unable to update renaming"
+				" APTPL metadata\n");
+			spin_unlock(&T10_RES(su_dev)->registration_lock);
+			return -1;
+		}
+		len += sprintf(buf+len, "%s", tmp);
+		reg_count++;
+	}
+	spin_unlock(&T10_RES(su_dev)->registration_lock);
+
+	if (!(reg_count))
+		len += sprintf(buf+len, "No Registrations or Reservations");
+
+	return 0;
+}
+
+static int core_scsi3_update_aptpl_buf(
+	struct se_device *dev,
+	unsigned char *buf,
+	u32 pr_aptpl_buf_len,
+	int clear_aptpl_metadata)
+{
+	int ret;
+
+	spin_lock(&dev->dev_reservation_lock);
+	ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
+				clear_aptpl_metadata);
+	spin_unlock(&dev->dev_reservation_lock);
+
+	return ret;
+}
+
+/*
+ * Called with struct se_device->aptpl_file_mutex held
+ */
+static int __core_scsi3_write_aptpl_to_file(
+	struct se_device *dev,
+	unsigned char *buf,
+	u32 pr_aptpl_buf_len)
+{
+	struct t10_wwn *wwn = &SU_DEV(dev)->t10_wwn;
+	struct file *file;
+	struct iovec iov[1];
+	mm_segment_t old_fs;
+	int flags = O_RDWR | O_CREAT | O_TRUNC;
+	char path[512];
+	int ret;
+
+	memset(iov, 0, sizeof(struct iovec));
+	memset(path, 0, 512);
+
+	if (strlen(&wwn->unit_serial[0]) > 512) {
+		printk(KERN_ERR "WWN value for struct se_device does not fit"
+			" into path buffer\n");
+		return -1;
+	}
+
+	snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
+	file = filp_open(path, flags, 0600);
+	if (IS_ERR(file) || !file || !file->f_dentry) {
+		printk(KERN_ERR "filp_open(%s) for APTPL metadata"
+			" failed\n", path);
+		return -1;
+	}
+
+	iov[0].iov_base = &buf[0];
+	if (!(pr_aptpl_buf_len))
+		iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
+	else
+		iov[0].iov_len = pr_aptpl_buf_len;
+
+	old_fs = get_fs();
+	set_fs(get_ds());
+	ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
+	set_fs(old_fs);
+
+	if (ret < 0) {
+		printk("Error writing APTPL metadata file: %s\n", path);
+		filp_close(file, NULL);
+		return -1;
+	}
+	filp_close(file, NULL);
+
+	return 0;
+}
+
+static int core_scsi3_update_and_write_aptpl(
+	struct se_device *dev,
+	unsigned char *in_buf,
+	u32 in_pr_aptpl_buf_len)
+{
+	unsigned char null_buf[64], *buf;
+	u32 pr_aptpl_buf_len;
+	int ret, clear_aptpl_metadata = 0;
+	/*
+	 * Can be called with a NULL pointer from PROUT service action CLEAR
+	 */
+	if (!(in_buf)) {
+		memset(null_buf, 0, 64);
+		buf = &null_buf[0];
+		/*
+		 * This will clear the APTPL metadata to:
+		 * "No Registrations or Reservations" status
+		 */
+		pr_aptpl_buf_len = 64;
+		clear_aptpl_metadata = 1;
+	} else {
+		buf = in_buf;
+		pr_aptpl_buf_len = in_pr_aptpl_buf_len;
+	}
+
+	ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
+				clear_aptpl_metadata);
+	if (ret != 0)
+		return -1;
+	/*
+	 * __core_scsi3_write_aptpl_to_file() will call strlen()
+	 * on the passed buf to determine pr_aptpl_buf_len.
+	 */
+	ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
+	if (ret != 0)
+		return -1;
+
+	return ret;
+}
+
+static int core_scsi3_emulate_pro_register(
+	struct se_cmd *cmd,
+	u64 res_key,
+	u64 sa_res_key,
+	int aptpl,
+	int all_tg_pt,
+	int spec_i_pt,
+	int ignore_key)
+{
+	struct se_session *se_sess = SE_SESS(cmd);
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_dev_entry *se_deve;
+	struct se_lun *se_lun = SE_LUN(cmd);
+	struct se_portal_group *se_tpg;
+	struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	/* Used for APTPL metadata w/ UNREGISTER */
+	unsigned char *pr_aptpl_buf = NULL;
+	unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
+	int pr_holder = 0, ret = 0, type;
+
+	if (!(se_sess) || !(se_lun)) {
+		printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	se_tpg = se_sess->se_tpg;
+	se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
+
+	if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) {
+		memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
+		TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess, &isid_buf[0],
+				PR_REG_ISID_LEN);
+		isid_ptr = &isid_buf[0];
+	}
+	/*
+	 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
+	 */
+	pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
+	if (!(pr_reg_e)) {
+		if (res_key) {
+			printk(KERN_WARNING "SPC-3 PR: Reservation Key non-zero"
+				" for SA REGISTER, returning CONFLICT\n");
+			return PYX_TRANSPORT_RESERVATION_CONFLICT;
+		}
+		/*
+		 * Do nothing but return GOOD status.
+		 */
+		if (!(sa_res_key))
+			return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+
+		if (!(spec_i_pt)) {
+			/*
+			 * Perform the Service Action REGISTER on the Initiator
+			 * Port Endpoint that the PRO was received from on the
+			 * Logical Unit of the SCSI device server.
+			 */
+			ret = core_scsi3_alloc_registration(SE_DEV(cmd),
+					se_sess->se_node_acl, se_deve, isid_ptr,
+					sa_res_key, all_tg_pt, aptpl,
+					ignore_key, 0);
+			if (ret != 0) {
+				printk(KERN_ERR "Unable to allocate"
+					" struct t10_pr_registration\n");
+				return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+			}
+		} else {
+			/*
+			 * Register both the Initiator port that received
+			 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
+			 * TransportID from Parameter list and loop through
+			 * fabric dependent parameter list while calling
+			 * logic from of core_scsi3_alloc_registration() for
+			 * each TransportID provided SCSI Initiator Port/Device
+			 */
+			ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
+					isid_ptr, sa_res_key, all_tg_pt, aptpl);
+			if (ret != 0)
+				return ret;
+		}
+		/*
+		 * Nothing left to do for the APTPL=0 case.
+		 */
+		if (!(aptpl)) {
+			pr_tmpl->pr_aptpl_active = 0;
+			core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
+			printk("SPC-3 PR: Set APTPL Bit Deactivated for"
+					" REGISTER\n");
+			return 0;
+		}
+		/*
+		 * Locate the newly allocated local I_T Nexus *pr_reg, and
+		 * update the APTPL metadata information using its
+		 * preallocated *pr_reg->pr_aptpl_buf.
+		 */
+		pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd),
+				se_sess->se_node_acl, se_sess);
+
+		ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
+				&pr_reg->pr_aptpl_buf[0],
+				pr_tmpl->pr_aptpl_buf_len);
+		if (!(ret)) {
+			pr_tmpl->pr_aptpl_active = 1;
+			printk("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
+		}
+
+		core_scsi3_put_pr_reg(pr_reg);
+		return ret;
+	} else {
+		/*
+		 * Locate the existing *pr_reg via struct se_node_acl pointers
+		 */
+		pr_reg = pr_reg_e;
+		type = pr_reg->pr_res_type;
+
+		if (!(ignore_key)) {
+			if (res_key != pr_reg->pr_res_key) {
+				printk(KERN_ERR "SPC-3 PR REGISTER: Received"
+					" res_key: 0x%016Lx does not match"
+					" existing SA REGISTER res_key:"
+					" 0x%016Lx\n", res_key,
+					pr_reg->pr_res_key);
+				core_scsi3_put_pr_reg(pr_reg);
+				return PYX_TRANSPORT_RESERVATION_CONFLICT;
+			}
+		}
+		if (spec_i_pt) {
+			printk(KERN_ERR "SPC-3 PR UNREGISTER: SPEC_I_PT"
+				" set while sa_res_key=0\n");
+			core_scsi3_put_pr_reg(pr_reg);
+			return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		}
+		/*
+		 * An existing ALL_TG_PT=1 registration being released
+		 * must also set ALL_TG_PT=1 in the incoming PROUT.
+		 */
+		if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
+			printk(KERN_ERR "SPC-3 PR UNREGISTER: ALL_TG_PT=1"
+				" registration exists, but ALL_TG_PT=1 bit not"
+				" present in received PROUT\n");
+			core_scsi3_put_pr_reg(pr_reg);
+			return PYX_TRANSPORT_INVALID_CDB_FIELD;
+		}
+		/*
+		 * Allocate APTPL metadata buffer used for UNREGISTER ops
+		 */
+		if (aptpl) {
+			pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
+						GFP_KERNEL);
+			if (!(pr_aptpl_buf)) {
+				printk(KERN_ERR "Unable to allocate"
+					" pr_aptpl_buf\n");
+				core_scsi3_put_pr_reg(pr_reg);
+				return PYX_TRANSPORT_LU_COMM_FAILURE;
+			}
+		}
+		/*
+		 * sa_res_key=0 Unregister Reservation Key for registered I_T
+		 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
+		 * Nexus.
+		 */
+		if (!(sa_res_key)) {
+			pr_holder = core_scsi3_check_implict_release(
+					SE_DEV(cmd), pr_reg);
+			if (pr_holder < 0) {
+				kfree(pr_aptpl_buf);
+				core_scsi3_put_pr_reg(pr_reg);
+				return PYX_TRANSPORT_RESERVATION_CONFLICT;
+			}
+
+			spin_lock(&pr_tmpl->registration_lock);
+			/*
+			 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
+			 * and matching pr_res_key.
+			 */
+			if (pr_reg->pr_reg_all_tg_pt) {
+				list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
+						&pr_tmpl->registration_list,
+						pr_reg_list) {
+
+					if (!(pr_reg_p->pr_reg_all_tg_pt))
+						continue;
+
+					if (pr_reg_p->pr_res_key != res_key)
+						continue;
+
+					if (pr_reg == pr_reg_p)
+						continue;
+
+					if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
+						   pr_reg_p->pr_reg_nacl->initiatorname))
+						continue;
+
+					__core_scsi3_free_registration(dev,
+							pr_reg_p, NULL, 0);
+				}
+			}
+			/*
+			 * Release the calling I_T Nexus registration now..
+			 */
+			__core_scsi3_free_registration(SE_DEV(cmd), pr_reg,
+							NULL, 1);
+			/*
+			 * From spc4r17, section 5.7.11.3 Unregistering
+			 *
+			 * If the persistent reservation is a registrants only
+			 * type, the device server shall establish a unit
+			 * attention condition for the initiator port associated
+			 * with every registered I_T nexus except for the I_T
+			 * nexus on which the PERSISTENT RESERVE OUT command was
+			 * received, with the additional sense code set to
+			 * RESERVATIONS RELEASED.
+			 */
+			if (pr_holder &&
+			   ((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
+			    (type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
+				list_for_each_entry(pr_reg_p,
+						&pr_tmpl->registration_list,
+						pr_reg_list) {
+
+					core_scsi3_ua_allocate(
+						pr_reg_p->pr_reg_nacl,
+						pr_reg_p->pr_res_mapped_lun,
+						0x2A,
+						ASCQ_2AH_RESERVATIONS_RELEASED);
+				}
+			}
+			spin_unlock(&pr_tmpl->registration_lock);
+
+			if (!(aptpl)) {
+				pr_tmpl->pr_aptpl_active = 0;
+				core_scsi3_update_and_write_aptpl(dev, NULL, 0);
+				printk("SPC-3 PR: Set APTPL Bit Deactivated"
+						" for UNREGISTER\n");
+				return 0;
+			}
+
+			ret = core_scsi3_update_and_write_aptpl(dev,
+					&pr_aptpl_buf[0],
+					pr_tmpl->pr_aptpl_buf_len);
+			if (!(ret)) {
+				pr_tmpl->pr_aptpl_active = 1;
+				printk("SPC-3 PR: Set APTPL Bit Activated"
+						" for UNREGISTER\n");
+			}
+
+			kfree(pr_aptpl_buf);
+			return ret;
+		} else {
+			/*
+			 * Increment PRgeneration counter for struct se_device"
+			 * upon a successful REGISTER, see spc4r17 section 6.3.2
+			 * READ_KEYS service action.
+			 */
+			pr_reg->pr_res_generation = core_scsi3_pr_generation(
+							SE_DEV(cmd));
+			pr_reg->pr_res_key = sa_res_key;
+			printk("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
+				" Key for %s to: 0x%016Lx PRgeneration:"
+				" 0x%08x\n", CMD_TFO(cmd)->get_fabric_name(),
+				(ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
+				pr_reg->pr_reg_nacl->initiatorname,
+				pr_reg->pr_res_key, pr_reg->pr_res_generation);
+
+			if (!(aptpl)) {
+				pr_tmpl->pr_aptpl_active = 0;
+				core_scsi3_update_and_write_aptpl(dev, NULL, 0);
+				core_scsi3_put_pr_reg(pr_reg);
+				printk("SPC-3 PR: Set APTPL Bit Deactivated"
+						" for REGISTER\n");
+				return 0;
+			}
+
+			ret = core_scsi3_update_and_write_aptpl(dev,
+					&pr_aptpl_buf[0],
+					pr_tmpl->pr_aptpl_buf_len);
+			if (!(ret)) {
+				pr_tmpl->pr_aptpl_active = 1;
+				printk("SPC-3 PR: Set APTPL Bit Activated"
+						" for REGISTER\n");
+			}
+
+			kfree(pr_aptpl_buf);
+			core_scsi3_put_pr_reg(pr_reg);
+		}
+	}
+	return 0;
+}
+
+unsigned char *core_scsi3_pr_dump_type(int type)
+{
+	switch (type) {
+	case PR_TYPE_WRITE_EXCLUSIVE:
+		return "Write Exclusive Access";
+	case PR_TYPE_EXCLUSIVE_ACCESS:
+		return "Exclusive Access";
+	case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
+		return "Write Exclusive Access, Registrants Only";
+	case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
+		return "Exclusive Access, Registrants Only";
+	case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
+		return "Write Exclusive Access, All Registrants";
+	case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
+		return "Exclusive Access, All Registrants";
+	default:
+		break;
+	}
+
+	return "Unknown SPC-3 PR Type";
+}
+
+static int core_scsi3_pro_reserve(
+	struct se_cmd *cmd,
+	struct se_device *dev,
+	int type,
+	int scope,
+	u64 res_key)
+{
+	struct se_session *se_sess = SE_SESS(cmd);
+	struct se_dev_entry *se_deve;
+	struct se_lun *se_lun = SE_LUN(cmd);
+	struct se_portal_group *se_tpg;
+	struct t10_pr_registration *pr_reg, *pr_res_holder;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	char i_buf[PR_REG_ISID_ID_LEN];
+	int ret, prf_isid;
+
+	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+
+	if (!(se_sess) || !(se_lun)) {
+		printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	se_tpg = se_sess->se_tpg;
+	se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
+	/*
+	 * Locate the existing *pr_reg via struct se_node_acl pointers
+	 */
+	pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
+				se_sess);
+	if (!(pr_reg)) {
+		printk(KERN_ERR "SPC-3 PR: Unable to locate"
+			" PR_REGISTERED *pr_reg for RESERVE\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	/*
+	 * From spc4r17 Section 5.7.9: Reserving:
+	 *
+	 * An application client creates a persistent reservation by issuing
+	 * a PERSISTENT RESERVE OUT command with RESERVE service action through
+	 * a registered I_T nexus with the following parameters:
+	 *    a) RESERVATION KEY set to the value of the reservation key that is
+	 * 	 registered with the logical unit for the I_T nexus; and
+	 */
+	if (res_key != pr_reg->pr_res_key) {
+		printk(KERN_ERR "SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
+			" does not match existing SA REGISTER res_key:"
+			" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+	/*
+	 * From spc4r17 Section 5.7.9: Reserving:
+	 *
+	 * From above:
+	 *  b) TYPE field and SCOPE field set to the persistent reservation
+	 *     being created.
+	 *
+	 * Only one persistent reservation is allowed at a time per logical unit
+	 * and that persistent reservation has a scope of LU_SCOPE.
+	 */
+	if (scope != PR_SCOPE_LU_SCOPE) {
+		printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+	/*
+	 * See if we have an existing PR reservation holder pointer at
+	 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
+	 * *pr_res_holder.
+	 */
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if ((pr_res_holder)) {
+		/*
+		 * From spc4r17 Section 5.7.9: Reserving:
+		 *
+		 * If the device server receives a PERSISTENT RESERVE OUT
+		 * command from an I_T nexus other than a persistent reservation
+		 * holder (see 5.7.10) that attempts to create a persistent
+		 * reservation when a persistent reservation already exists for
+		 * the logical unit, then the command shall be completed with
+		 * RESERVATION CONFLICT status.
+		 */
+		if (pr_res_holder != pr_reg) {
+			struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
+			printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from"
+				" [%s]: %s while reservation already held by"
+				" [%s]: %s, returning RESERVATION_CONFLICT\n",
+				CMD_TFO(cmd)->get_fabric_name(),
+				se_sess->se_node_acl->initiatorname,
+				TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
+				pr_res_holder->pr_reg_nacl->initiatorname);
+
+			spin_unlock(&dev->dev_reservation_lock);
+			core_scsi3_put_pr_reg(pr_reg);
+			return PYX_TRANSPORT_RESERVATION_CONFLICT;
+		}
+		/*
+		 * From spc4r17 Section 5.7.9: Reserving:
+		 *
+		 * If a persistent reservation holder attempts to modify the
+		 * type or scope of an existing persistent reservation, the
+		 * command shall be completed with RESERVATION CONFLICT status.
+		 */
+		if ((pr_res_holder->pr_res_type != type) ||
+		    (pr_res_holder->pr_res_scope != scope)) {
+			struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
+			printk(KERN_ERR "SPC-3 PR: Attempted RESERVE from"
+				" [%s]: %s trying to change TYPE and/or SCOPE,"
+				" while reservation already held by [%s]: %s,"
+				" returning RESERVATION_CONFLICT\n",
+				CMD_TFO(cmd)->get_fabric_name(),
+				se_sess->se_node_acl->initiatorname,
+				TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
+				pr_res_holder->pr_reg_nacl->initiatorname);
+
+			spin_unlock(&dev->dev_reservation_lock);
+			core_scsi3_put_pr_reg(pr_reg);
+			return PYX_TRANSPORT_RESERVATION_CONFLICT;
+		}
+		/*
+		 * From spc4r17 Section 5.7.9: Reserving:
+		 *
+		 * If the device server receives a PERSISTENT RESERVE OUT
+		 * command with RESERVE service action where the TYPE field and
+		 * the SCOPE field contain the same values as the existing type
+		 * and scope from a persistent reservation holder, it shall not
+		 * make any change to the existing persistent reservation and
+		 * shall completethe command with GOOD status.
+		 */
+		spin_unlock(&dev->dev_reservation_lock);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+	}
+	/*
+	 * Otherwise, our *pr_reg becomes the PR reservation holder for said
+	 * TYPE/SCOPE.  Also set the received scope and type in *pr_reg.
+	 */
+	pr_reg->pr_res_scope = scope;
+	pr_reg->pr_res_type = type;
+	pr_reg->pr_res_holder = 1;
+	dev->dev_pr_res_holder = pr_reg;
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: RESERVE created new"
+		" reservation holder TYPE: %s ALL_TG_PT: %d\n",
+		CMD_TFO(cmd)->get_fabric_name(), core_scsi3_pr_dump_type(type),
+		(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
+	printk(KERN_INFO "SPC-3 PR [%s] RESERVE Node: %s%s\n",
+			CMD_TFO(cmd)->get_fabric_name(),
+			se_sess->se_node_acl->initiatorname,
+			(prf_isid) ? &i_buf[0] : "");
+	spin_unlock(&dev->dev_reservation_lock);
+
+	if (pr_tmpl->pr_aptpl_active) {
+		ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
+				&pr_reg->pr_aptpl_buf[0],
+				pr_tmpl->pr_aptpl_buf_len);
+		if (!(ret))
+			printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata"
+					" for RESERVE\n");
+	}
+
+	core_scsi3_put_pr_reg(pr_reg);
+	return 0;
+}
+
+static int core_scsi3_emulate_pro_reserve(
+	struct se_cmd *cmd,
+	int type,
+	int scope,
+	u64 res_key)
+{
+	struct se_device *dev = cmd->se_dev;
+	int ret = 0;
+
+	switch (type) {
+	case PR_TYPE_WRITE_EXCLUSIVE:
+	case PR_TYPE_EXCLUSIVE_ACCESS:
+	case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
+	case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
+	case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
+	case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
+		ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
+		break;
+	default:
+		printk(KERN_ERR "SPC-3 PR: Unknown Service Action RESERVE Type:"
+			" 0x%02x\n", type);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+	return ret;
+}
+
+/*
+ * Called with struct se_device->dev_reservation_lock held.
+ */
+static void __core_scsi3_complete_pro_release(
+	struct se_device *dev,
+	struct se_node_acl *se_nacl,
+	struct t10_pr_registration *pr_reg,
+	int explict)
+{
+	struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
+	char i_buf[PR_REG_ISID_ID_LEN];
+	int prf_isid;
+
+	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+	/*
+	 * Go ahead and release the current PR reservation holder.
+	 */
+	dev->dev_pr_res_holder = NULL;
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: %s RELEASE cleared"
+		" reservation holder TYPE: %s ALL_TG_PT: %d\n",
+		tfo->get_fabric_name(), (explict) ? "explict" : "implict",
+		core_scsi3_pr_dump_type(pr_reg->pr_res_type),
+		(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
+	printk(KERN_INFO "SPC-3 PR [%s] RELEASE Node: %s%s\n",
+		tfo->get_fabric_name(), se_nacl->initiatorname,
+		(prf_isid) ? &i_buf[0] : "");
+	/*
+	 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
+	 */
+	pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
+}
+
+static int core_scsi3_emulate_pro_release(
+	struct se_cmd *cmd,
+	int type,
+	int scope,
+	u64 res_key)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_session *se_sess = SE_SESS(cmd);
+	struct se_lun *se_lun = SE_LUN(cmd);
+	struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	int ret, all_reg = 0;
+
+	if (!(se_sess) || !(se_lun)) {
+		printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	/*
+	 * Locate the existing *pr_reg via struct se_node_acl pointers
+	 */
+	pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
+	if (!(pr_reg)) {
+		printk(KERN_ERR "SPC-3 PR: Unable to locate"
+			" PR_REGISTERED *pr_reg for RELEASE\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	/*
+	 * From spc4r17 Section 5.7.11.2 Releasing:
+	 *
+	 * If there is no persistent reservation or in response to a persistent
+	 * reservation release request from a registered I_T nexus that is not a
+	 * persistent reservation holder (see 5.7.10), the device server shall
+	 * do the following:
+	 *
+	 *     a) Not release the persistent reservation, if any;
+	 *     b) Not remove any registrations; and
+	 *     c) Complete the command with GOOD status.
+	 */
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if (!(pr_res_holder)) {
+		/*
+		 * No persistent reservation, return GOOD status.
+		 */
+		spin_unlock(&dev->dev_reservation_lock);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+	}
+	if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
+	    (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
+		all_reg = 1;
+
+	if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
+		/*
+		 * Non 'All Registrants' PR Type cases..
+		 * Release request from a registered I_T nexus that is not a
+		 * persistent reservation holder. return GOOD status.
+		 */
+		spin_unlock(&dev->dev_reservation_lock);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+	}
+	/*
+	 * From spc4r17 Section 5.7.11.2 Releasing:
+	 *
+	 * Only the persistent reservation holder (see 5.7.10) is allowed to
+	 * release a persistent reservation.
+	 *
+	 * An application client releases the persistent reservation by issuing
+	 * a PERSISTENT RESERVE OUT command with RELEASE service action through
+	 * an I_T nexus that is a persistent reservation holder with the
+	 * following parameters:
+	 *
+	 *     a) RESERVATION KEY field set to the value of the reservation key
+	 *	  that is registered with the logical unit for the I_T nexus;
+	 */
+	if (res_key != pr_reg->pr_res_key) {
+		printk(KERN_ERR "SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
+			" does not match existing SA REGISTER res_key:"
+			" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
+		spin_unlock(&dev->dev_reservation_lock);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+	/*
+	 * From spc4r17 Section 5.7.11.2 Releasing and above:
+	 *
+	 * b) TYPE field and SCOPE field set to match the persistent
+	 *    reservation being released.
+	 */
+	if ((pr_res_holder->pr_res_type != type) ||
+	    (pr_res_holder->pr_res_scope != scope)) {
+		struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
+		printk(KERN_ERR "SPC-3 PR RELEASE: Attempted to release"
+			" reservation from [%s]: %s with different TYPE "
+			"and/or SCOPE  while reservation already held by"
+			" [%s]: %s, returning RESERVATION_CONFLICT\n",
+			CMD_TFO(cmd)->get_fabric_name(),
+			se_sess->se_node_acl->initiatorname,
+			TPG_TFO(pr_res_nacl->se_tpg)->get_fabric_name(),
+			pr_res_holder->pr_reg_nacl->initiatorname);
+
+		spin_unlock(&dev->dev_reservation_lock);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+	/*
+	 * In response to a persistent reservation release request from the
+	 * persistent reservation holder the device server shall perform a
+	 * release by doing the following as an uninterrupted series of actions:
+	 * a) Release the persistent reservation;
+	 * b) Not remove any registration(s);
+	 * c) If the released persistent reservation is a registrants only type
+	 * or all registrants type persistent reservation,
+	 *    the device server shall establish a unit attention condition for
+	 *    the initiator port associated with every regis-
+	 *    tered I_T nexus other than I_T nexus on which the PERSISTENT
+	 *    RESERVE OUT command with RELEASE service action was received,
+	 *    with the additional sense code set to RESERVATIONS RELEASED; and
+	 * d) If the persistent reservation is of any other type, the device
+	 *    server shall not establish a unit attention condition.
+	 */
+	__core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
+			pr_reg, 1);
+
+	spin_unlock(&dev->dev_reservation_lock);
+
+	if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
+	    (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
+	    (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
+	    (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
+		/*
+		 * If no UNIT ATTENTION conditions will be established for
+		 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
+		 * go ahead and check for APTPL=1 update+write below
+		 */
+		goto write_aptpl;
+	}
+
+	spin_lock(&pr_tmpl->registration_lock);
+	list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
+			pr_reg_list) {
+		/*
+		 * Do not establish a UNIT ATTENTION condition
+		 * for the calling I_T Nexus
+		 */
+		if (pr_reg_p == pr_reg)
+			continue;
+
+		core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
+				pr_reg_p->pr_res_mapped_lun,
+				0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
+	}
+	spin_unlock(&pr_tmpl->registration_lock);
+
+write_aptpl:
+	if (pr_tmpl->pr_aptpl_active) {
+		ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
+				&pr_reg->pr_aptpl_buf[0],
+				pr_tmpl->pr_aptpl_buf_len);
+		if (!(ret))
+			printk("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
+	}
+
+	core_scsi3_put_pr_reg(pr_reg);
+	return 0;
+}
+
+static int core_scsi3_emulate_pro_clear(
+	struct se_cmd *cmd,
+	u64 res_key)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_node_acl *pr_reg_nacl;
+	struct se_session *se_sess = SE_SESS(cmd);
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
+	u32 pr_res_mapped_lun = 0;
+	int calling_it_nexus = 0;
+	/*
+	 * Locate the existing *pr_reg via struct se_node_acl pointers
+	 */
+	pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd),
+			se_sess->se_node_acl, se_sess);
+	if (!(pr_reg_n)) {
+		printk(KERN_ERR "SPC-3 PR: Unable to locate"
+			" PR_REGISTERED *pr_reg for CLEAR\n");
+			return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	/*
+	 * From spc4r17 section 5.7.11.6, Clearing:
+	 *
+	 * Any application client may release the persistent reservation and
+	 * remove all registrations from a device server by issuing a
+	 * PERSISTENT RESERVE OUT command with CLEAR service action through a
+	 * registered I_T nexus with the following parameter:
+	 *
+	 *	a) RESERVATION KEY field set to the value of the reservation key
+	 * 	   that is registered with the logical unit for the I_T nexus.
+	 */
+	if (res_key != pr_reg_n->pr_res_key) {
+		printk(KERN_ERR "SPC-3 PR REGISTER: Received"
+			" res_key: 0x%016Lx does not match"
+			" existing SA REGISTER res_key:"
+			" 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
+		core_scsi3_put_pr_reg(pr_reg_n);
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+	/*
+	 * a) Release the persistent reservation, if any;
+	 */
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if (pr_res_holder) {
+		struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
+		__core_scsi3_complete_pro_release(dev, pr_res_nacl,
+			pr_res_holder, 0);
+	}
+	spin_unlock(&dev->dev_reservation_lock);
+	/*
+	 * b) Remove all registration(s) (see spc4r17 5.7.7);
+	 */
+	spin_lock(&pr_tmpl->registration_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+			&pr_tmpl->registration_list, pr_reg_list) {
+
+		calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
+		pr_reg_nacl = pr_reg->pr_reg_nacl;
+		pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
+		__core_scsi3_free_registration(dev, pr_reg, NULL,
+					calling_it_nexus);
+		/*
+		 * e) Establish a unit attention condition for the initiator
+		 *    port associated with every registered I_T nexus other
+		 *    than the I_T nexus on which the PERSISTENT RESERVE OUT
+		 *    command with CLEAR service action was received, with the
+		 *    additional sense code set to RESERVATIONS PREEMPTED.
+		 */
+		if (!(calling_it_nexus))
+			core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
+				0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
+	}
+	spin_unlock(&pr_tmpl->registration_lock);
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: CLEAR complete\n",
+		CMD_TFO(cmd)->get_fabric_name());
+
+	if (pr_tmpl->pr_aptpl_active) {
+		core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
+		printk(KERN_INFO "SPC-3 PR: Updated APTPL metadata"
+				" for CLEAR\n");
+	}
+
+	core_scsi3_pr_generation(dev);
+	return 0;
+}
+
+/*
+ * Called with struct se_device->dev_reservation_lock held.
+ */
+static void __core_scsi3_complete_pro_preempt(
+	struct se_device *dev,
+	struct t10_pr_registration *pr_reg,
+	struct list_head *preempt_and_abort_list,
+	int type,
+	int scope,
+	int abort)
+{
+	struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
+	struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
+	char i_buf[PR_REG_ISID_ID_LEN];
+	int prf_isid;
+
+	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+	/*
+	 * Do an implict RELEASE of the existing reservation.
+	 */
+	if (dev->dev_pr_res_holder)
+		__core_scsi3_complete_pro_release(dev, nacl,
+				dev->dev_pr_res_holder, 0);
+
+	dev->dev_pr_res_holder = pr_reg;
+	pr_reg->pr_res_holder = 1;
+	pr_reg->pr_res_type = type;
+	pr_reg->pr_res_scope = scope;
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: PREEMPT%s created new"
+		" reservation holder TYPE: %s ALL_TG_PT: %d\n",
+		tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
+		core_scsi3_pr_dump_type(type),
+		(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
+	printk(KERN_INFO "SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
+		tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
+		nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
+	/*
+	 * For PREEMPT_AND_ABORT, add the preempting reservation's
+	 * struct t10_pr_registration to the list that will be compared
+	 * against received CDBs..
+	 */
+	if (preempt_and_abort_list)
+		list_add_tail(&pr_reg->pr_reg_abort_list,
+				preempt_and_abort_list);
+}
+
+static void core_scsi3_release_preempt_and_abort(
+	struct list_head *preempt_and_abort_list,
+	struct t10_pr_registration *pr_reg_holder)
+{
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp;
+
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
+				pr_reg_abort_list) {
+
+		list_del(&pr_reg->pr_reg_abort_list);
+		if (pr_reg_holder == pr_reg)
+			continue;
+		if (pr_reg->pr_res_holder) {
+			printk(KERN_WARNING "pr_reg->pr_res_holder still set\n");
+			continue;
+		}
+
+		pr_reg->pr_reg_deve = NULL;
+		pr_reg->pr_reg_nacl = NULL;
+		kfree(pr_reg->pr_aptpl_buf);
+		kmem_cache_free(t10_pr_reg_cache, pr_reg);
+	}
+}
+
+int core_scsi3_check_cdb_abort_and_preempt(
+	struct list_head *preempt_and_abort_list,
+	struct se_cmd *cmd)
+{
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp;
+
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
+				pr_reg_abort_list) {
+		if (pr_reg->pr_res_key == cmd->pr_res_key)
+			return 0;
+	}
+
+	return 1;
+}
+
+static int core_scsi3_pro_preempt(
+	struct se_cmd *cmd,
+	int type,
+	int scope,
+	u64 res_key,
+	u64 sa_res_key,
+	int abort)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_dev_entry *se_deve;
+	struct se_node_acl *pr_reg_nacl;
+	struct se_session *se_sess = SE_SESS(cmd);
+	struct list_head preempt_and_abort_list;
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	u32 pr_res_mapped_lun = 0;
+	int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
+	int prh_type = 0, prh_scope = 0, ret;
+
+	if (!(se_sess))
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+	se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
+	pr_reg_n = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
+				se_sess);
+	if (!(pr_reg_n)) {
+		printk(KERN_ERR "SPC-3 PR: Unable to locate"
+			" PR_REGISTERED *pr_reg for PREEMPT%s\n",
+			(abort) ? "_AND_ABORT" : "");
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+	if (pr_reg_n->pr_res_key != res_key) {
+		core_scsi3_put_pr_reg(pr_reg_n);
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+	if (scope != PR_SCOPE_LU_SCOPE) {
+		printk(KERN_ERR "SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
+		core_scsi3_put_pr_reg(pr_reg_n);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+	INIT_LIST_HEAD(&preempt_and_abort_list);
+
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if (pr_res_holder &&
+	   ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
+	    (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
+		all_reg = 1;
+
+	if (!(all_reg) && !(sa_res_key)) {
+		spin_unlock(&dev->dev_reservation_lock);
+		core_scsi3_put_pr_reg(pr_reg_n);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+	/*
+	 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
+	 *
+	 * If the SERVICE ACTION RESERVATION KEY field does not identify a
+	 * persistent reservation holder or there is no persistent reservation
+	 * holder (i.e., there is no persistent reservation), then the device
+	 * server shall perform a preempt by doing the following in an
+	 * uninterrupted series of actions. (See below..)
+	 */
+	if (!(pr_res_holder) || (pr_res_holder->pr_res_key != sa_res_key)) {
+		/*
+		 * No existing or SA Reservation Key matching reservations..
+		 *
+		 * PROUT SA PREEMPT with All Registrant type reservations are
+		 * allowed to be processed without a matching SA Reservation Key
+		 */
+		spin_lock(&pr_tmpl->registration_lock);
+		list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+				&pr_tmpl->registration_list, pr_reg_list) {
+			/*
+			 * Removing of registrations in non all registrants
+			 * type reservations without a matching SA reservation
+			 * key.
+			 *
+			 * a) Remove the registrations for all I_T nexuses
+			 *    specified by the SERVICE ACTION RESERVATION KEY
+			 *    field;
+			 * b) Ignore the contents of the SCOPE and TYPE fields;
+			 * c) Process tasks as defined in 5.7.1; and
+			 * d) Establish a unit attention condition for the
+			 *    initiator port associated with every I_T nexus
+			 *    that lost its registration other than the I_T
+			 *    nexus on which the PERSISTENT RESERVE OUT command
+			 *    was received, with the additional sense code set
+			 *    to REGISTRATIONS PREEMPTED.
+			 */
+			if (!(all_reg)) {
+				if (pr_reg->pr_res_key != sa_res_key)
+					continue;
+
+				calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
+				pr_reg_nacl = pr_reg->pr_reg_nacl;
+				pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
+				__core_scsi3_free_registration(dev, pr_reg,
+					(abort) ? &preempt_and_abort_list :
+						NULL, calling_it_nexus);
+				released_regs++;
+			} else {
+				/*
+				 * Case for any existing all registrants type
+				 * reservation, follow logic in spc4r17 section
+				 * 5.7.11.4 Preempting, Table 52 and Figure 7.
+				 *
+				 * For a ZERO SA Reservation key, release
+				 * all other registrations and do an implict
+				 * release of active persistent reservation.
+				 *
+				 * For a non-ZERO SA Reservation key, only
+				 * release the matching reservation key from
+				 * registrations.
+				 */
+				if ((sa_res_key) &&
+				     (pr_reg->pr_res_key != sa_res_key))
+					continue;
+
+				calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
+				if (calling_it_nexus)
+					continue;
+
+				pr_reg_nacl = pr_reg->pr_reg_nacl;
+				pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
+				__core_scsi3_free_registration(dev, pr_reg,
+					(abort) ? &preempt_and_abort_list :
+						NULL, 0);
+				released_regs++;
+			}
+			if (!(calling_it_nexus))
+				core_scsi3_ua_allocate(pr_reg_nacl,
+					pr_res_mapped_lun, 0x2A,
+					ASCQ_2AH_RESERVATIONS_PREEMPTED);
+		}
+		spin_unlock(&pr_tmpl->registration_lock);
+		/*
+		 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
+		 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
+		 * RESERVATION KEY field to a value that does not match any
+		 * registered reservation key, then the device server shall
+		 * complete the command with RESERVATION CONFLICT status.
+		 */
+		if (!(released_regs)) {
+			spin_unlock(&dev->dev_reservation_lock);
+			core_scsi3_put_pr_reg(pr_reg_n);
+			return PYX_TRANSPORT_RESERVATION_CONFLICT;
+		}
+		/*
+		 * For an existing all registrants type reservation
+		 * with a zero SA rservation key, preempt the existing
+		 * reservation with the new PR type and scope.
+		 */
+		if (pr_res_holder && all_reg && !(sa_res_key)) {
+			__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
+				(abort) ? &preempt_and_abort_list : NULL,
+				type, scope, abort);
+
+			if (abort)
+				core_scsi3_release_preempt_and_abort(
+					&preempt_and_abort_list, pr_reg_n);
+		}
+		spin_unlock(&dev->dev_reservation_lock);
+
+		if (pr_tmpl->pr_aptpl_active) {
+			ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
+					&pr_reg_n->pr_aptpl_buf[0],
+					pr_tmpl->pr_aptpl_buf_len);
+			if (!(ret))
+				printk(KERN_INFO "SPC-3 PR: Updated APTPL"
+					" metadata for  PREEMPT%s\n", (abort) ?
+					"_AND_ABORT" : "");
+		}
+
+		core_scsi3_put_pr_reg(pr_reg_n);
+		core_scsi3_pr_generation(SE_DEV(cmd));
+		return 0;
+	}
+	/*
+	 * The PREEMPTing SA reservation key matches that of the
+	 * existing persistent reservation, first, we check if
+	 * we are preempting our own reservation.
+	 * From spc4r17, section 5.7.11.4.3 Preempting
+	 * persistent reservations and registration handling
+	 *
+	 * If an all registrants persistent reservation is not
+	 * present, it is not an error for the persistent
+	 * reservation holder to preempt itself (i.e., a
+	 * PERSISTENT RESERVE OUT with a PREEMPT service action
+	 * or a PREEMPT AND ABORT service action with the
+	 * SERVICE ACTION RESERVATION KEY value equal to the
+	 * persistent reservation holder's reservation key that
+	 * is received from the persistent reservation holder).
+	 * In that case, the device server shall establish the
+	 * new persistent reservation and maintain the
+	 * registration.
+	 */
+	prh_type = pr_res_holder->pr_res_type;
+	prh_scope = pr_res_holder->pr_res_scope;
+	/*
+	 * If the SERVICE ACTION RESERVATION KEY field identifies a
+	 * persistent reservation holder (see 5.7.10), the device
+	 * server shall perform a preempt by doing the following as
+	 * an uninterrupted series of actions:
+	 *
+	 * a) Release the persistent reservation for the holder
+	 *    identified by the SERVICE ACTION RESERVATION KEY field;
+	 */
+	if (pr_reg_n != pr_res_holder)
+		__core_scsi3_complete_pro_release(dev,
+				pr_res_holder->pr_reg_nacl,
+				dev->dev_pr_res_holder, 0);
+	/*
+	 * b) Remove the registrations for all I_T nexuses identified
+	 *    by the SERVICE ACTION RESERVATION KEY field, except the
+	 *    I_T nexus that is being used for the PERSISTENT RESERVE
+	 *    OUT command. If an all registrants persistent reservation
+	 *    is present and the SERVICE ACTION RESERVATION KEY field
+	 *    is set to zero, then all registrations shall be removed
+	 *    except for that of the I_T nexus that is being used for
+	 *    the PERSISTENT RESERVE OUT command;
+	 */
+	spin_lock(&pr_tmpl->registration_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+			&pr_tmpl->registration_list, pr_reg_list) {
+
+		calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
+		if (calling_it_nexus)
+			continue;
+
+		if (pr_reg->pr_res_key != sa_res_key)
+			continue;
+
+		pr_reg_nacl = pr_reg->pr_reg_nacl;
+		pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
+		__core_scsi3_free_registration(dev, pr_reg,
+				(abort) ? &preempt_and_abort_list : NULL,
+				calling_it_nexus);
+		/*
+		 * e) Establish a unit attention condition for the initiator
+		 *    port associated with every I_T nexus that lost its
+		 *    persistent reservation and/or registration, with the
+		 *    additional sense code set to REGISTRATIONS PREEMPTED;
+		 */
+		core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
+				ASCQ_2AH_RESERVATIONS_PREEMPTED);
+	}
+	spin_unlock(&pr_tmpl->registration_lock);
+	/*
+	 * c) Establish a persistent reservation for the preempting
+	 *    I_T nexus using the contents of the SCOPE and TYPE fields;
+	 */
+	__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
+			(abort) ? &preempt_and_abort_list : NULL,
+			type, scope, abort);
+	/*
+	 * d) Process tasks as defined in 5.7.1;
+	 * e) See above..
+	 * f) If the type or scope has changed, then for every I_T nexus
+	 *    whose reservation key was not removed, except for the I_T
+	 *    nexus on which the PERSISTENT RESERVE OUT command was
+	 *    received, the device server shall establish a unit
+	 *    attention condition for the initiator port associated with
+	 *    that I_T nexus, with the additional sense code set to
+	 *    RESERVATIONS RELEASED. If the type or scope have not
+	 *    changed, then no unit attention condition(s) shall be
+	 *    established for this reason.
+	 */
+	if ((prh_type != type) || (prh_scope != scope)) {
+		spin_lock(&pr_tmpl->registration_lock);
+		list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+				&pr_tmpl->registration_list, pr_reg_list) {
+
+			calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
+			if (calling_it_nexus)
+				continue;
+
+			core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
+					pr_reg->pr_res_mapped_lun, 0x2A,
+					ASCQ_2AH_RESERVATIONS_RELEASED);
+		}
+		spin_unlock(&pr_tmpl->registration_lock);
+	}
+	spin_unlock(&dev->dev_reservation_lock);
+	/*
+	 * Call LUN_RESET logic upon list of struct t10_pr_registration,
+	 * All received CDBs for the matching existing reservation and
+	 * registrations undergo ABORT_TASK logic.
+	 *
+	 * From there, core_scsi3_release_preempt_and_abort() will
+	 * release every registration in the list (which have already
+	 * been removed from the primary pr_reg list), except the
+	 * new persistent reservation holder, the calling Initiator Port.
+	 */
+	if (abort) {
+		core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
+		core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
+						pr_reg_n);
+	}
+
+	if (pr_tmpl->pr_aptpl_active) {
+		ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
+				&pr_reg_n->pr_aptpl_buf[0],
+				pr_tmpl->pr_aptpl_buf_len);
+		if (!(ret))
+			printk("SPC-3 PR: Updated APTPL metadata for PREEMPT"
+				"%s\n", (abort) ? "_AND_ABORT" : "");
+	}
+
+	core_scsi3_put_pr_reg(pr_reg_n);
+	core_scsi3_pr_generation(SE_DEV(cmd));
+	return 0;
+}
+
+static int core_scsi3_emulate_pro_preempt(
+	struct se_cmd *cmd,
+	int type,
+	int scope,
+	u64 res_key,
+	u64 sa_res_key,
+	int abort)
+{
+	int ret = 0;
+
+	switch (type) {
+	case PR_TYPE_WRITE_EXCLUSIVE:
+	case PR_TYPE_EXCLUSIVE_ACCESS:
+	case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
+	case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
+	case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
+	case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
+		ret = core_scsi3_pro_preempt(cmd, type, scope,
+				res_key, sa_res_key, abort);
+		break;
+	default:
+		printk(KERN_ERR "SPC-3 PR: Unknown Service Action PREEMPT%s"
+			" Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+	return ret;
+}
+
+
+static int core_scsi3_emulate_pro_register_and_move(
+	struct se_cmd *cmd,
+	u64 res_key,
+	u64 sa_res_key,
+	int aptpl,
+	int unreg)
+{
+	struct se_session *se_sess = SE_SESS(cmd);
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_dev_entry *se_deve, *dest_se_deve = NULL;
+	struct se_lun *se_lun = SE_LUN(cmd);
+	struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
+	struct se_port *se_port;
+	struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
+	struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
+	struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	unsigned char *initiator_str;
+	char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
+	u32 tid_len, tmp_tid_len;
+	int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
+	unsigned short rtpi;
+	unsigned char proto_ident;
+
+	if (!(se_sess) || !(se_lun)) {
+		printk(KERN_ERR "SPC-3 PR: se_sess || struct se_lun is NULL!\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	memset(dest_iport, 0, 64);
+	memset(i_buf, 0, PR_REG_ISID_ID_LEN);
+	se_tpg = se_sess->se_tpg;
+	tf_ops = TPG_TFO(se_tpg);
+	se_deve = &se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
+	/*
+	 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
+	 *	Register behaviors for a REGISTER AND MOVE service action
+	 *
+	 * Locate the existing *pr_reg via struct se_node_acl pointers
+	 */
+	pr_reg = core_scsi3_locate_pr_reg(SE_DEV(cmd), se_sess->se_node_acl,
+				se_sess);
+	if (!(pr_reg)) {
+		printk(KERN_ERR "SPC-3 PR: Unable to locate PR_REGISTERED"
+			" *pr_reg for REGISTER_AND_MOVE\n");
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	/*
+	 * The provided reservation key much match the existing reservation key
+	 * provided during this initiator's I_T nexus registration.
+	 */
+	if (res_key != pr_reg->pr_res_key) {
+		printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received"
+			" res_key: 0x%016Lx does not match existing SA REGISTER"
+			" res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+	/*
+	 * The service active reservation key needs to be non zero
+	 */
+	if (!(sa_res_key)) {
+		printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Received zero"
+			" sa_res_key\n");
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+	/*
+	 * Determine the Relative Target Port Identifier where the reservation
+	 * will be moved to for the TransportID containing SCSI initiator WWN
+	 * information.
+	 */
+	rtpi = (buf[18] & 0xff) << 8;
+	rtpi |= buf[19] & 0xff;
+	tid_len = (buf[20] & 0xff) << 24;
+	tid_len |= (buf[21] & 0xff) << 16;
+	tid_len |= (buf[22] & 0xff) << 8;
+	tid_len |= buf[23] & 0xff;
+
+	if ((tid_len + 24) != cmd->data_length) {
+		printk(KERN_ERR "SPC-3 PR: Illegal tid_len: %u + 24 byte header"
+			" does not equal CDB data_length: %u\n", tid_len,
+			cmd->data_length);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+
+	spin_lock(&dev->se_port_lock);
+	list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
+		if (se_port->sep_rtpi != rtpi)
+			continue;
+		dest_se_tpg = se_port->sep_tpg;
+		if (!(dest_se_tpg))
+			continue;
+		dest_tf_ops = TPG_TFO(dest_se_tpg);
+		if (!(dest_tf_ops))
+			continue;
+
+		atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&dev->se_port_lock);
+
+		ret = core_scsi3_tpg_depend_item(dest_se_tpg);
+		if (ret != 0) {
+			printk(KERN_ERR "core_scsi3_tpg_depend_item() failed"
+				" for dest_se_tpg\n");
+			atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
+			smp_mb__after_atomic_dec();
+			core_scsi3_put_pr_reg(pr_reg);
+			return PYX_TRANSPORT_LU_COMM_FAILURE;
+		}
+
+		spin_lock(&dev->se_port_lock);
+		break;
+	}
+	spin_unlock(&dev->se_port_lock);
+
+	if (!(dest_se_tpg) || (!dest_tf_ops)) {
+		printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
+			" fabric ops from Relative Target Port Identifier:"
+			" %hu\n", rtpi);
+		core_scsi3_put_pr_reg(pr_reg);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+	proto_ident = (buf[24] & 0x0f);
+#if 0
+	printk("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
+			" 0x%02x\n", proto_ident);
+#endif
+	if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
+		printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Received"
+			" proto_ident: 0x%02x does not match ident: 0x%02x"
+			" from fabric: %s\n", proto_ident,
+			dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
+			dest_tf_ops->get_fabric_name());
+		ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		goto out;
+	}
+	if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
+		printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
+			" containg a valid tpg_parse_pr_out_transport_id"
+			" function pointer\n");
+		ret = PYX_TRANSPORT_LU_COMM_FAILURE;
+		goto out;
+	}
+	initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
+			(const char *)&buf[24], &tmp_tid_len, &iport_ptr);
+	if (!(initiator_str)) {
+		printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
+			" initiator_str from Transport ID\n");
+		ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		goto out;
+	}
+
+	printk(KERN_INFO "SPC-3 PR [%s] Extracted initiator %s identifier: %s"
+		" %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
+		"port" : "device", initiator_str, (iport_ptr != NULL) ?
+		iport_ptr : "");
+	/*
+	 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
+	 * action specifies a TransportID that is the same as the initiator port
+	 * of the I_T nexus for the command received, then the command shall
+	 * be terminated with CHECK CONDITION status, with the sense key set to
+	 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
+	 * IN PARAMETER LIST.
+	 */
+	pr_reg_nacl = pr_reg->pr_reg_nacl;
+	matching_iname = (!strcmp(initiator_str,
+				  pr_reg_nacl->initiatorname)) ? 1 : 0;
+	if (!(matching_iname))
+		goto after_iport_check;
+
+	if (!(iport_ptr) || !(pr_reg->isid_present_at_reg)) {
+		printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
+			" matches: %s on received I_T Nexus\n", initiator_str,
+			pr_reg_nacl->initiatorname);
+		ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		goto out;
+	}
+	if (!(strcmp(iport_ptr, pr_reg->pr_reg_isid))) {
+		printk(KERN_ERR "SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
+			" matches: %s %s on received I_T Nexus\n",
+			initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
+			pr_reg->pr_reg_isid);
+		ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		goto out;
+	}
+after_iport_check:
+	/*
+	 * Locate the destination struct se_node_acl from the received Transport ID
+	 */
+	spin_lock_bh(&dest_se_tpg->acl_node_lock);
+	dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
+				initiator_str);
+	if (dest_node_acl) {
+		atomic_inc(&dest_node_acl->acl_pr_ref_count);
+		smp_mb__after_atomic_inc();
+	}
+	spin_unlock_bh(&dest_se_tpg->acl_node_lock);
+
+	if (!(dest_node_acl)) {
+		printk(KERN_ERR "Unable to locate %s dest_node_acl for"
+			" TransportID%s\n", dest_tf_ops->get_fabric_name(),
+			initiator_str);
+		ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		goto out;
+	}
+	ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
+	if (ret != 0) {
+		printk(KERN_ERR "core_scsi3_nodeacl_depend_item() for"
+			" dest_node_acl\n");
+		atomic_dec(&dest_node_acl->acl_pr_ref_count);
+		smp_mb__after_atomic_dec();
+		dest_node_acl = NULL;
+		ret = PYX_TRANSPORT_LU_COMM_FAILURE;
+		goto out;
+	}
+#if 0
+	printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
+		" %s from TransportID\n", dest_tf_ops->get_fabric_name(),
+		dest_node_acl->initiatorname);
+#endif
+	/*
+	 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
+	 * PORT IDENTIFIER.
+	 */
+	dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
+	if (!(dest_se_deve)) {
+		printk(KERN_ERR "Unable to locate %s dest_se_deve from RTPI:"
+			" %hu\n",  dest_tf_ops->get_fabric_name(), rtpi);
+		ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+		goto out;
+	}
+
+	ret = core_scsi3_lunacl_depend_item(dest_se_deve);
+	if (ret < 0) {
+		printk(KERN_ERR "core_scsi3_lunacl_depend_item() failed\n");
+		atomic_dec(&dest_se_deve->pr_ref_count);
+		smp_mb__after_atomic_dec();
+		dest_se_deve = NULL;
+		ret = PYX_TRANSPORT_LU_COMM_FAILURE;
+		goto out;
+	}
+#if 0
+	printk(KERN_INFO "SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
+		" ACL for dest_se_deve->mapped_lun: %u\n",
+		dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
+		dest_se_deve->mapped_lun);
+#endif
+	/*
+	 * A persistent reservation needs to already existing in order to
+	 * successfully complete the REGISTER_AND_MOVE service action..
+	 */
+	spin_lock(&dev->dev_reservation_lock);
+	pr_res_holder = dev->dev_pr_res_holder;
+	if (!(pr_res_holder)) {
+		printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: No reservation"
+			" currently held\n");
+		spin_unlock(&dev->dev_reservation_lock);
+		ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
+		goto out;
+	}
+	/*
+	 * The received on I_T Nexus must be the reservation holder.
+	 *
+	 * From spc4r17 section 5.7.8  Table 50 --
+	 * 	Register behaviors for a REGISTER AND MOVE service action
+	 */
+	if (pr_res_holder != pr_reg) {
+		printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
+			" Nexus is not reservation holder\n");
+		spin_unlock(&dev->dev_reservation_lock);
+		ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
+		goto out;
+	}
+	/*
+	 * From spc4r17 section 5.7.8: registering and moving reservation
+	 *
+	 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
+	 * action is received and the established persistent reservation is a
+	 * Write Exclusive - All Registrants type or Exclusive Access -
+	 * All Registrants type reservation, then the command shall be completed
+	 * with RESERVATION CONFLICT status.
+	 */
+	if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
+	    (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
+		printk(KERN_WARNING "SPC-3 PR REGISTER_AND_MOVE: Unable to move"
+			" reservation for type: %s\n",
+			core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
+		spin_unlock(&dev->dev_reservation_lock);
+		ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
+		goto out;
+	}
+	pr_res_nacl = pr_res_holder->pr_reg_nacl;
+	/*
+	 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
+	 */
+	type = pr_res_holder->pr_res_type;
+	scope = pr_res_holder->pr_res_type;
+	/*
+	 * c) Associate the reservation key specified in the SERVICE ACTION
+	 *    RESERVATION KEY field with the I_T nexus specified as the
+	 *    destination of the register and move, where:
+	 *    A) The I_T nexus is specified by the TransportID and the
+	 *	 RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
+	 *    B) Regardless of the TransportID format used, the association for
+	 *       the initiator port is based on either the initiator port name
+	 *       (see 3.1.71) on SCSI transport protocols where port names are
+	 *       required or the initiator port identifier (see 3.1.70) on SCSI
+	 *       transport protocols where port names are not required;
+	 * d) Register the reservation key specified in the SERVICE ACTION
+	 *    RESERVATION KEY field;
+	 * e) Retain the reservation key specified in the SERVICE ACTION
+	 *    RESERVATION KEY field and associated information;
+	 *
+	 * Also, It is not an error for a REGISTER AND MOVE service action to
+	 * register an I_T nexus that is already registered with the same
+	 * reservation key or a different reservation key.
+	 */
+	dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
+					iport_ptr);
+	if (!(dest_pr_reg)) {
+		ret = core_scsi3_alloc_registration(SE_DEV(cmd),
+				dest_node_acl, dest_se_deve, iport_ptr,
+				sa_res_key, 0, aptpl, 2, 1);
+		if (ret != 0) {
+			spin_unlock(&dev->dev_reservation_lock);
+			ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+			goto out;
+		}
+		dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
+						iport_ptr);
+		new_reg = 1;
+	}
+	/*
+	 * f) Release the persistent reservation for the persistent reservation
+	 *    holder (i.e., the I_T nexus on which the
+	 */
+	__core_scsi3_complete_pro_release(dev, pr_res_nacl,
+			dev->dev_pr_res_holder, 0);
+	/*
+	 * g) Move the persistent reservation to the specified I_T nexus using
+	 *    the same scope and type as the persistent reservation released in
+	 *    item f); and
+	 */
+	dev->dev_pr_res_holder = dest_pr_reg;
+	dest_pr_reg->pr_res_holder = 1;
+	dest_pr_reg->pr_res_type = type;
+	pr_reg->pr_res_scope = scope;
+	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
+				PR_REG_ISID_ID_LEN);
+	/*
+	 * Increment PRGeneration for existing registrations..
+	 */
+	if (!(new_reg))
+		dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
+	spin_unlock(&dev->dev_reservation_lock);
+
+	printk(KERN_INFO "SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
+		" created new reservation holder TYPE: %s on object RTPI:"
+		" %hu  PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
+		core_scsi3_pr_dump_type(type), rtpi,
+		dest_pr_reg->pr_res_generation);
+	printk(KERN_INFO "SPC-3 PR Successfully moved reservation from"
+		" %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
+		tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
+		(prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
+		dest_node_acl->initiatorname, (iport_ptr != NULL) ?
+		iport_ptr : "");
+	/*
+	 * It is now safe to release configfs group dependencies for destination
+	 * of Transport ID Initiator Device/Port Identifier
+	 */
+	core_scsi3_lunacl_undepend_item(dest_se_deve);
+	core_scsi3_nodeacl_undepend_item(dest_node_acl);
+	core_scsi3_tpg_undepend_item(dest_se_tpg);
+	/*
+	 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
+	 * nexus on which PERSISTENT RESERVE OUT command was received.
+	 */
+	if (unreg) {
+		spin_lock(&pr_tmpl->registration_lock);
+		__core_scsi3_free_registration(dev, pr_reg, NULL, 1);
+		spin_unlock(&pr_tmpl->registration_lock);
+	} else
+		core_scsi3_put_pr_reg(pr_reg);
+
+	/*
+	 * Clear the APTPL metadata if APTPL has been disabled, otherwise
+	 * write out the updated metadata to struct file for this SCSI device.
+	 */
+	if (!(aptpl)) {
+		pr_tmpl->pr_aptpl_active = 0;
+		core_scsi3_update_and_write_aptpl(SE_DEV(cmd), NULL, 0);
+		printk("SPC-3 PR: Set APTPL Bit Deactivated for"
+				" REGISTER_AND_MOVE\n");
+	} else {
+		pr_tmpl->pr_aptpl_active = 1;
+		ret = core_scsi3_update_and_write_aptpl(SE_DEV(cmd),
+				&dest_pr_reg->pr_aptpl_buf[0],
+				pr_tmpl->pr_aptpl_buf_len);
+		if (!(ret))
+			printk("SPC-3 PR: Set APTPL Bit Activated for"
+					" REGISTER_AND_MOVE\n");
+	}
+
+	core_scsi3_put_pr_reg(dest_pr_reg);
+	return 0;
+out:
+	if (dest_se_deve)
+		core_scsi3_lunacl_undepend_item(dest_se_deve);
+	if (dest_node_acl)
+		core_scsi3_nodeacl_undepend_item(dest_node_acl);
+	core_scsi3_tpg_undepend_item(dest_se_tpg);
+	core_scsi3_put_pr_reg(pr_reg);
+	return ret;
+}
+
+static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
+{
+	unsigned int __v1, __v2;
+
+	__v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
+	__v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
+
+	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+/*
+ * See spc4r17 section 6.14 Table 170
+ */
+static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
+{
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	u64 res_key, sa_res_key;
+	int sa, scope, type, aptpl;
+	int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
+	/*
+	 * FIXME: A NULL struct se_session pointer means an this is not coming from
+	 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
+	 */
+	if (!(SE_SESS(cmd)))
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+	if (cmd->data_length < 24) {
+		printk(KERN_WARNING "SPC-PR: Recieved PR OUT parameter list"
+			" length too small: %u\n", cmd->data_length);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+	/*
+	 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
+	 */
+	sa = (cdb[1] & 0x1f);
+	scope = (cdb[2] & 0xf0);
+	type = (cdb[2] & 0x0f);
+	/*
+	 * From PERSISTENT_RESERVE_OUT parameter list (payload)
+	 */
+	res_key = core_scsi3_extract_reservation_key(&buf[0]);
+	sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
+	/*
+	 * REGISTER_AND_MOVE uses a different SA parameter list containing
+	 * SCSI TransportIDs.
+	 */
+	if (sa != PRO_REGISTER_AND_MOVE) {
+		spec_i_pt = (buf[20] & 0x08);
+		all_tg_pt = (buf[20] & 0x04);
+		aptpl = (buf[20] & 0x01);
+	} else {
+		aptpl = (buf[17] & 0x01);
+		unreg = (buf[17] & 0x02);
+	}
+	/*
+	 * SPEC_I_PT=1 is only valid for Service action: REGISTER
+	 */
+	if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	/*
+	 * From spc4r17 section 6.14:
+	 *
+	 * If the SPEC_I_PT bit is set to zero, the service action is not
+	 * REGISTER AND MOVE, and the parameter list length is not 24, then
+	 * the command shall be terminated with CHECK CONDITION status, with
+	 * the sense key set to ILLEGAL REQUEST, and the additional sense
+	 * code set to PARAMETER LIST LENGTH ERROR.
+	 */
+	if (!(spec_i_pt) && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
+	    (cmd->data_length != 24)) {
+		printk(KERN_WARNING "SPC-PR: Recieved PR OUT illegal parameter"
+			" list length: %u\n", cmd->data_length);
+		return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+	}
+	/*
+	 * (core_scsi3_emulate_pro_* function parameters
+	 * are defined by spc4r17 Table 174:
+	 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
+	 */
+	switch (sa) {
+	case PRO_REGISTER:
+		return core_scsi3_emulate_pro_register(cmd,
+			res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
+	case PRO_RESERVE:
+		return core_scsi3_emulate_pro_reserve(cmd,
+			type, scope, res_key);
+	case PRO_RELEASE:
+		return core_scsi3_emulate_pro_release(cmd,
+			type, scope, res_key);
+	case PRO_CLEAR:
+		return core_scsi3_emulate_pro_clear(cmd, res_key);
+	case PRO_PREEMPT:
+		return core_scsi3_emulate_pro_preempt(cmd, type, scope,
+					res_key, sa_res_key, 0);
+	case PRO_PREEMPT_AND_ABORT:
+		return core_scsi3_emulate_pro_preempt(cmd, type, scope,
+					res_key, sa_res_key, 1);
+	case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
+		return core_scsi3_emulate_pro_register(cmd,
+			0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
+	case PRO_REGISTER_AND_MOVE:
+		return core_scsi3_emulate_pro_register_and_move(cmd, res_key,
+				sa_res_key, aptpl, unreg);
+	default:
+		printk(KERN_ERR "Unknown PERSISTENT_RESERVE_OUT service"
+			" action: 0x%02x\n", cdb[1] & 0x1f);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+	return PYX_TRANSPORT_INVALID_CDB_FIELD;
+}
+
+/*
+ * PERSISTENT_RESERVE_IN Service Action READ_KEYS
+ *
+ * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
+ */
+static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
+{
+	struct se_device *se_dev = SE_DEV(cmd);
+	struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
+	struct t10_pr_registration *pr_reg;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	u32 add_len = 0, off = 8;
+
+	if (cmd->data_length < 8) {
+		printk(KERN_ERR "PRIN SA READ_KEYS SCSI Data Length: %u"
+			" too small\n", cmd->data_length);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+	buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
+	buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
+	buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
+	buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
+
+	spin_lock(&T10_RES(su_dev)->registration_lock);
+	list_for_each_entry(pr_reg, &T10_RES(su_dev)->registration_list,
+			pr_reg_list) {
+		/*
+		 * Check for overflow of 8byte PRI READ_KEYS payload and
+		 * next reservation key list descriptor.
+		 */
+		if ((add_len + 8) > (cmd->data_length - 8))
+			break;
+
+		buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
+		buf[off++] = (pr_reg->pr_res_key & 0xff);
+
+		add_len += 8;
+	}
+	spin_unlock(&T10_RES(su_dev)->registration_lock);
+
+	buf[4] = ((add_len >> 24) & 0xff);
+	buf[5] = ((add_len >> 16) & 0xff);
+	buf[6] = ((add_len >> 8) & 0xff);
+	buf[7] = (add_len & 0xff);
+
+	return 0;
+}
+
+/*
+ * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
+ *
+ * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
+ */
+static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
+{
+	struct se_device *se_dev = SE_DEV(cmd);
+	struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
+	struct t10_pr_registration *pr_reg;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	u64 pr_res_key;
+	u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
+
+	if (cmd->data_length < 8) {
+		printk(KERN_ERR "PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
+			" too small\n", cmd->data_length);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+	buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
+	buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
+	buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
+	buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
+
+	spin_lock(&se_dev->dev_reservation_lock);
+	pr_reg = se_dev->dev_pr_res_holder;
+	if ((pr_reg)) {
+		/*
+		 * Set the hardcoded Additional Length
+		 */
+		buf[4] = ((add_len >> 24) & 0xff);
+		buf[5] = ((add_len >> 16) & 0xff);
+		buf[6] = ((add_len >> 8) & 0xff);
+		buf[7] = (add_len & 0xff);
+
+		if (cmd->data_length < 22) {
+			spin_unlock(&se_dev->dev_reservation_lock);
+			return 0;
+		}
+		/*
+		 * Set the Reservation key.
+		 *
+		 * From spc4r17, section 5.7.10:
+		 * A persistent reservation holder has its reservation key
+		 * returned in the parameter data from a PERSISTENT
+		 * RESERVE IN command with READ RESERVATION service action as
+		 * follows:
+		 * a) For a persistent reservation of the type Write Exclusive
+		 *    - All Registrants or Exclusive Access ­ All Regitrants,
+		 *      the reservation key shall be set to zero; or
+		 * b) For all other persistent reservation types, the
+		 *    reservation key shall be set to the registered
+		 *    reservation key for the I_T nexus that holds the
+		 *    persistent reservation.
+		 */
+		if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
+		    (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
+			pr_res_key = 0;
+		else
+			pr_res_key = pr_reg->pr_res_key;
+
+		buf[8] = ((pr_res_key >> 56) & 0xff);
+		buf[9] = ((pr_res_key >> 48) & 0xff);
+		buf[10] = ((pr_res_key >> 40) & 0xff);
+		buf[11] = ((pr_res_key >> 32) & 0xff);
+		buf[12] = ((pr_res_key >> 24) & 0xff);
+		buf[13] = ((pr_res_key >> 16) & 0xff);
+		buf[14] = ((pr_res_key >> 8) & 0xff);
+		buf[15] = (pr_res_key & 0xff);
+		/*
+		 * Set the SCOPE and TYPE
+		 */
+		buf[21] = (pr_reg->pr_res_scope & 0xf0) |
+			  (pr_reg->pr_res_type & 0x0f);
+	}
+	spin_unlock(&se_dev->dev_reservation_lock);
+
+	return 0;
+}
+
+/*
+ * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
+ *
+ * See spc4r17 section 6.13.4 Table 165
+ */
+static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(dev)->t10_reservation;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	u16 add_len = 8; /* Hardcoded to 8. */
+
+	if (cmd->data_length < 6) {
+		printk(KERN_ERR "PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
+			" %u too small\n", cmd->data_length);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+	buf[0] = ((add_len << 8) & 0xff);
+	buf[1] = (add_len & 0xff);
+	buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
+	buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
+	buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
+	buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
+	/*
+	 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
+	 * set the TMV: Task Mask Valid bit.
+	 */
+	buf[3] |= 0x80;
+	/*
+	 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
+	 */
+	buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
+	/*
+	 * PTPL_A: Persistence across Target Power Loss Active bit
+	 */
+	if (pr_tmpl->pr_aptpl_active)
+		buf[3] |= 0x01;
+	/*
+	 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
+	 */
+	buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
+	buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
+	buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
+	buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
+	buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
+	buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
+
+	return 0;
+}
+
+/*
+ * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
+ *
+ * See spc4r17 section 6.13.5 Table 168 and 169
+ */
+static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
+{
+	struct se_device *se_dev = SE_DEV(cmd);
+	struct se_node_acl *se_nacl;
+	struct se_subsystem_dev *su_dev = SU_DEV(se_dev);
+	struct se_portal_group *se_tpg;
+	struct t10_pr_registration *pr_reg, *pr_reg_tmp;
+	struct t10_reservation_template *pr_tmpl = &SU_DEV(se_dev)->t10_reservation;
+	unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+	u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
+	u32 off = 8; /* off into first Full Status descriptor */
+	int format_code = 0;
+
+	if (cmd->data_length < 8) {
+		printk(KERN_ERR "PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
+			" too small\n", cmd->data_length);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+	buf[0] = ((T10_RES(su_dev)->pr_generation >> 24) & 0xff);
+	buf[1] = ((T10_RES(su_dev)->pr_generation >> 16) & 0xff);
+	buf[2] = ((T10_RES(su_dev)->pr_generation >> 8) & 0xff);
+	buf[3] = (T10_RES(su_dev)->pr_generation & 0xff);
+
+	spin_lock(&pr_tmpl->registration_lock);
+	list_for_each_entry_safe(pr_reg, pr_reg_tmp,
+			&pr_tmpl->registration_list, pr_reg_list) {
+
+		se_nacl = pr_reg->pr_reg_nacl;
+		se_tpg = pr_reg->pr_reg_nacl->se_tpg;
+		add_desc_len = 0;
+
+		atomic_inc(&pr_reg->pr_res_holders);
+		smp_mb__after_atomic_inc();
+		spin_unlock(&pr_tmpl->registration_lock);
+		/*
+		 * Determine expected length of $FABRIC_MOD specific
+		 * TransportID full status descriptor..
+		 */
+		exp_desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id_len(
+				se_tpg, se_nacl, pr_reg, &format_code);
+
+		if ((exp_desc_len + add_len) > cmd->data_length) {
+			printk(KERN_WARNING "SPC-3 PRIN READ_FULL_STATUS ran"
+				" out of buffer: %d\n", cmd->data_length);
+			spin_lock(&pr_tmpl->registration_lock);
+			atomic_dec(&pr_reg->pr_res_holders);
+			smp_mb__after_atomic_dec();
+			break;
+		}
+		/*
+		 * Set RESERVATION KEY
+		 */
+		buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
+		buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
+		buf[off++] = (pr_reg->pr_res_key & 0xff);
+		off += 4; /* Skip Over Reserved area */
+
+		/*
+		 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
+		 */
+		if (pr_reg->pr_reg_all_tg_pt)
+			buf[off] = 0x02;
+		/*
+		 * The struct se_lun pointer will be present for the
+		 * reservation holder for PR_HOLDER bit.
+		 *
+		 * Also, if this registration is the reservation
+		 * holder, fill in SCOPE and TYPE in the next byte.
+		 */
+		if (pr_reg->pr_res_holder) {
+			buf[off++] |= 0x01;
+			buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
+				     (pr_reg->pr_res_type & 0x0f);
+		} else
+			off += 2;
+
+		off += 4; /* Skip over reserved area */
+		/*
+		 * From spc4r17 6.3.15:
+		 *
+		 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
+		 * IDENTIFIER field contains the relative port identifier (see
+		 * 3.1.120) of the target port that is part of the I_T nexus
+		 * described by this full status descriptor. If the ALL_TG_PT
+		 * bit is set to one, the contents of the RELATIVE TARGET PORT
+		 * IDENTIFIER field are not defined by this standard.
+		 */
+		if (!(pr_reg->pr_reg_all_tg_pt)) {
+			struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
+
+			buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
+			buf[off++] = (port->sep_rtpi & 0xff);
+		} else
+			off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
+
+		/*
+		 * Now, have the $FABRIC_MOD fill in the protocol identifier
+		 */
+		desc_len = TPG_TFO(se_tpg)->tpg_get_pr_transport_id(se_tpg,
+				se_nacl, pr_reg, &format_code, &buf[off+4]);
+
+		spin_lock(&pr_tmpl->registration_lock);
+		atomic_dec(&pr_reg->pr_res_holders);
+		smp_mb__after_atomic_dec();
+		/*
+		 * Set the ADDITIONAL DESCRIPTOR LENGTH
+		 */
+		buf[off++] = ((desc_len >> 24) & 0xff);
+		buf[off++] = ((desc_len >> 16) & 0xff);
+		buf[off++] = ((desc_len >> 8) & 0xff);
+		buf[off++] = (desc_len & 0xff);
+		/*
+		 * Size of full desctipor header minus TransportID
+		 * containing $FABRIC_MOD specific) initiator device/port
+		 * WWN information.
+		 *
+		 *  See spc4r17 Section 6.13.5 Table 169
+		 */
+		add_desc_len = (24 + desc_len);
+
+		off += desc_len;
+		add_len += add_desc_len;
+	}
+	spin_unlock(&pr_tmpl->registration_lock);
+	/*
+	 * Set ADDITIONAL_LENGTH
+	 */
+	buf[4] = ((add_len >> 24) & 0xff);
+	buf[5] = ((add_len >> 16) & 0xff);
+	buf[6] = ((add_len >> 8) & 0xff);
+	buf[7] = (add_len & 0xff);
+
+	return 0;
+}
+
+static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
+{
+	switch (cdb[1] & 0x1f) {
+	case PRI_READ_KEYS:
+		return core_scsi3_pri_read_keys(cmd);
+	case PRI_READ_RESERVATION:
+		return core_scsi3_pri_read_reservation(cmd);
+	case PRI_REPORT_CAPABILITIES:
+		return core_scsi3_pri_report_capabilities(cmd);
+	case PRI_READ_FULL_STATUS:
+		return core_scsi3_pri_read_full_status(cmd);
+	default:
+		printk(KERN_ERR "Unknown PERSISTENT_RESERVE_IN service"
+			" action: 0x%02x\n", cdb[1] & 0x1f);
+		return PYX_TRANSPORT_INVALID_CDB_FIELD;
+	}
+
+}
+
+int core_scsi3_emulate_pr(struct se_cmd *cmd)
+{
+	unsigned char *cdb = &T_TASK(cmd)->t_task_cdb[0];
+	struct se_device *dev = cmd->se_dev;
+	/*
+	 * Following spc2r20 5.5.1 Reservations overview:
+	 *
+	 * If a logical unit has been reserved by any RESERVE command and is
+	 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
+	 * PERSISTENT RESERVE OUT commands shall conflict regardless of
+	 * initiator or service action and shall terminate with a RESERVATION
+	 * CONFLICT status.
+	 */
+	if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
+		printk(KERN_ERR "Received PERSISTENT_RESERVE CDB while legacy"
+			" SPC-2 reservation is held, returning"
+			" RESERVATION_CONFLICT\n");
+		return PYX_TRANSPORT_RESERVATION_CONFLICT;
+	}
+
+	return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
+	       core_scsi3_emulate_pr_out(cmd, cdb) :
+	       core_scsi3_emulate_pr_in(cmd, cdb);
+}
+
+static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
+{
+	return 0;
+}
+
+static int core_pt_seq_non_holder(
+	struct se_cmd *cmd,
+	unsigned char *cdb,
+	u32 pr_reg_type)
+{
+	return 0;
+}
+
+int core_setup_reservations(struct se_device *dev, int force_pt)
+{
+	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
+	struct t10_reservation_template *rest = &su_dev->t10_reservation;
+	/*
+	 * If this device is from Target_Core_Mod/pSCSI, use the reservations
+	 * of the Underlying SCSI hardware.  In Linux/SCSI terms, this can
+	 * cause a problem because libata and some SATA RAID HBAs appear
+	 * under Linux/SCSI, but to emulate reservations themselves.
+	 */
+	if (((TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
+	    !(DEV_ATTRIB(dev)->emulate_reservations)) || force_pt) {
+		rest->res_type = SPC_PASSTHROUGH;
+		rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
+		rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
+		printk(KERN_INFO "%s: Using SPC_PASSTHROUGH, no reservation"
+			" emulation\n", TRANSPORT(dev)->name);
+		return 0;
+	}
+	/*
+	 * If SPC-3 or above is reported by real or emulated struct se_device,
+	 * use emulated Persistent Reservations.
+	 */
+	if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) {
+		rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
+		rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
+		rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
+		printk(KERN_INFO "%s: Using SPC3_PERSISTENT_RESERVATIONS"
+			" emulation\n", TRANSPORT(dev)->name);
+	} else {
+		rest->res_type = SPC2_RESERVATIONS;
+		rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
+		rest->pr_ops.t10_seq_non_holder =
+				&core_scsi2_reservation_seq_non_holder;
+		printk(KERN_INFO "%s: Using SPC2_RESERVATIONS emulation\n",
+			TRANSPORT(dev)->name);
+	}
+
+	return 0;
+}
diff --git a/drivers/target/target_core_pr.h b/drivers/target/target_core_pr.h
new file mode 100644
index 0000000..5603bcf
--- /dev/null
+++ b/drivers/target/target_core_pr.h
@@ -0,0 +1,67 @@
+#ifndef TARGET_CORE_PR_H
+#define TARGET_CORE_PR_H
+/*
+ * PERSISTENT_RESERVE_OUT service action codes
+ *
+ * spc4r17 section 6.14.2 Table 171
+ */
+#define PRO_REGISTER				0x00
+#define PRO_RESERVE				0x01
+#define PRO_RELEASE				0x02
+#define PRO_CLEAR				0x03
+#define PRO_PREEMPT				0x04
+#define PRO_PREEMPT_AND_ABORT			0x05
+#define PRO_REGISTER_AND_IGNORE_EXISTING_KEY	0x06
+#define PRO_REGISTER_AND_MOVE			0x07
+/*
+ * PERSISTENT_RESERVE_IN service action codes
+ *
+ * spc4r17 section 6.13.1 Table 159
+ */
+#define PRI_READ_KEYS				0x00
+#define PRI_READ_RESERVATION			0x01
+#define PRI_REPORT_CAPABILITIES			0x02
+#define PRI_READ_FULL_STATUS			0x03
+/*
+ * PERSISTENT_RESERVE_ SCOPE field
+ *
+ * spc4r17 section 6.13.3.3 Table 163
+ */
+#define PR_SCOPE_LU_SCOPE			0x00
+/*
+ * PERSISTENT_RESERVE_* TYPE field
+ *
+ * spc4r17 section 6.13.3.4 Table 164
+ */
+#define PR_TYPE_WRITE_EXCLUSIVE			0x01
+#define PR_TYPE_EXCLUSIVE_ACCESS		0x03
+#define PR_TYPE_WRITE_EXCLUSIVE_REGONLY		0x05
+#define PR_TYPE_EXCLUSIVE_ACCESS_REGONLY	0x06
+#define PR_TYPE_WRITE_EXCLUSIVE_ALLREG		0x07
+#define PR_TYPE_EXCLUSIVE_ACCESS_ALLREG		0x08
+
+#define PR_APTPL_MAX_IPORT_LEN			256
+#define PR_APTPL_MAX_TPORT_LEN			256
+
+extern struct kmem_cache *t10_pr_reg_cache;
+
+extern int core_pr_dump_initiator_port(struct t10_pr_registration *,
+			char *, u32);
+extern int core_scsi2_emulate_crh(struct se_cmd *);
+extern int core_scsi3_alloc_aptpl_registration(
+			struct t10_reservation_template *, u64,
+			unsigned char *, unsigned char *, u32,
+			unsigned char *, u16, u32, int, int, u8);
+extern int core_scsi3_check_aptpl_registration(struct se_device *,
+			struct se_portal_group *, struct se_lun *,
+			struct se_lun_acl *);
+extern void core_scsi3_free_pr_reg_from_nacl(struct se_device *,
+					     struct se_node_acl *);
+extern void core_scsi3_free_all_registrations(struct se_device *);
+extern unsigned char *core_scsi3_pr_dump_type(int);
+extern int core_scsi3_check_cdb_abort_and_preempt(struct list_head *,
+						  struct se_cmd *);
+extern int core_scsi3_emulate_pr(struct se_cmd *);
+extern int core_setup_reservations(struct se_device *, int);
+
+#endif /* TARGET_CORE_PR_H */
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
new file mode 100644
index 0000000..742d246
--- /dev/null
+++ b/drivers/target/target_core_pscsi.c
@@ -0,0 +1,1470 @@
+/*******************************************************************************
+ * Filename:  target_core_pscsi.c
+ *
+ * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/timer.h>
+#include <linux/blkdev.h>
+#include <linux/blk_types.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/genhd.h>
+#include <linux/cdrom.h>
+#include <linux/file.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/libsas.h> /* For TASK_ATTR_* */
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_pscsi.h"
+
+#define ISPRINT(a)  ((a >= ' ') && (a <= '~'))
+
+static struct se_subsystem_api pscsi_template;
+
+static void pscsi_req_done(struct request *, int);
+
+/*	pscsi_get_sh():
+ *
+ *
+ */
+static struct Scsi_Host *pscsi_get_sh(u32 host_no)
+{
+	struct Scsi_Host *sh = NULL;
+
+	sh = scsi_host_lookup(host_no);
+	if (IS_ERR(sh)) {
+		printk(KERN_ERR "Unable to locate SCSI HBA with Host ID:"
+				" %u\n", host_no);
+		return NULL;
+	}
+
+	return sh;
+}
+
+/*	pscsi_attach_hba():
+ *
+ * 	pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
+ *	from the passed SCSI Host ID.
+ */
+static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
+{
+	int hba_depth;
+	struct pscsi_hba_virt *phv;
+
+	phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
+	if (!(phv)) {
+		printk(KERN_ERR "Unable to allocate struct pscsi_hba_virt\n");
+		return -1;
+	}
+	phv->phv_host_id = host_id;
+	phv->phv_mode = PHV_VIRUTAL_HOST_ID;
+	hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
+	atomic_set(&hba->left_queue_depth, hba_depth);
+	atomic_set(&hba->max_queue_depth, hba_depth);
+
+	hba->hba_ptr = (void *)phv;
+
+	printk(KERN_INFO "CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
+		" Generic Target Core Stack %s\n", hba->hba_id,
+		PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
+	printk(KERN_INFO "CORE_HBA[%d] - Attached SCSI HBA to Generic"
+		" Target Core with TCQ Depth: %d\n", hba->hba_id,
+		atomic_read(&hba->max_queue_depth));
+
+	return 0;
+}
+
+static void pscsi_detach_hba(struct se_hba *hba)
+{
+	struct pscsi_hba_virt *phv = hba->hba_ptr;
+	struct Scsi_Host *scsi_host = phv->phv_lld_host;
+
+	if (scsi_host) {
+		scsi_host_put(scsi_host);
+
+		printk(KERN_INFO "CORE_HBA[%d] - Detached SCSI HBA: %s from"
+			" Generic Target Core\n", hba->hba_id,
+			(scsi_host->hostt->name) ? (scsi_host->hostt->name) :
+			"Unknown");
+	} else
+		printk(KERN_INFO "CORE_HBA[%d] - Detached Virtual SCSI HBA"
+			" from Generic Target Core\n", hba->hba_id);
+
+	kfree(phv);
+	hba->hba_ptr = NULL;
+}
+
+static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
+{
+	struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
+	struct Scsi_Host *sh = phv->phv_lld_host;
+	int hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
+	/*
+	 * Release the struct Scsi_Host
+	 */
+	if (!(mode_flag)) {
+		if (!(sh))
+			return 0;
+
+		phv->phv_lld_host = NULL;
+		phv->phv_mode = PHV_VIRUTAL_HOST_ID;
+		atomic_set(&hba->left_queue_depth, hba_depth);
+		atomic_set(&hba->max_queue_depth, hba_depth);
+
+		printk(KERN_INFO "CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
+			" %s\n", hba->hba_id, (sh->hostt->name) ?
+			(sh->hostt->name) : "Unknown");
+
+		scsi_host_put(sh);
+		return 0;
+	}
+	/*
+	 * Otherwise, locate struct Scsi_Host from the original passed
+	 * pSCSI Host ID and enable for phba mode
+	 */
+	sh = pscsi_get_sh(phv->phv_host_id);
+	if (!(sh)) {
+		printk(KERN_ERR "pSCSI: Unable to locate SCSI Host for"
+			" phv_host_id: %d\n", phv->phv_host_id);
+		return -1;
+	}
+	/*
+	 * Usually the SCSI LLD will use the hostt->can_queue value to define
+	 * its HBA TCQ depth.  Some other drivers (like 2.6 megaraid) don't set
+	 * this at all and set sh->can_queue at runtime.
+	 */
+	hba_depth = (sh->hostt->can_queue > sh->can_queue) ?
+		sh->hostt->can_queue : sh->can_queue;
+
+	atomic_set(&hba->left_queue_depth, hba_depth);
+	atomic_set(&hba->max_queue_depth, hba_depth);
+
+	phv->phv_lld_host = sh;
+	phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
+
+	printk(KERN_INFO "CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
+		hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
+
+	return 1;
+}
+
+static void pscsi_tape_read_blocksize(struct se_device *dev,
+		struct scsi_device *sdev)
+{
+	unsigned char cdb[MAX_COMMAND_SIZE], *buf;
+	int ret;
+
+	buf = kzalloc(12, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	memset(cdb, 0, MAX_COMMAND_SIZE);
+	cdb[0] = MODE_SENSE;
+	cdb[4] = 0x0c; /* 12 bytes */
+
+	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
+			HZ, 1, NULL);
+	if (ret)
+		goto out_free;
+
+	/*
+	 * If MODE_SENSE still returns zero, set the default value to 1024.
+	 */
+	sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
+	if (!sdev->sector_size)
+		sdev->sector_size = 1024;
+out_free:
+	kfree(buf);
+}
+
+static void
+pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
+{
+	unsigned char *buf;
+
+	if (sdev->inquiry_len < INQUIRY_LEN)
+		return;
+
+	buf = sdev->inquiry;
+	if (!buf)
+		return;
+	/*
+	 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
+	 */
+	memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
+	memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
+	memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
+}
+
+static int
+pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
+{
+	unsigned char cdb[MAX_COMMAND_SIZE], *buf;
+	int ret;
+
+	buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
+	if (!buf)
+		return -1;
+
+	memset(cdb, 0, MAX_COMMAND_SIZE);
+	cdb[0] = INQUIRY;
+	cdb[1] = 0x01; /* Query VPD */
+	cdb[2] = 0x80; /* Unit Serial Number */
+	cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
+	cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
+
+	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
+			      INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
+	if (ret)
+		goto out_free;
+
+	snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
+
+	wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL;
+
+	kfree(buf);
+	return 0;
+
+out_free:
+	kfree(buf);
+	return -1;
+}
+
+static void
+pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
+		struct t10_wwn *wwn)
+{
+	unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
+	int ident_len, page_len, off = 4, ret;
+	struct t10_vpd *vpd;
+
+	buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	memset(cdb, 0, MAX_COMMAND_SIZE);
+	cdb[0] = INQUIRY;
+	cdb[1] = 0x01; /* Query VPD */
+	cdb[2] = 0x83; /* Device Identifier */
+	cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
+	cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
+
+	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
+			      INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
+			      NULL, HZ, 1, NULL);
+	if (ret)
+		goto out;
+
+	page_len = (buf[2] << 8) | buf[3];
+	while (page_len > 0) {
+		/* Grab a pointer to the Identification descriptor */
+		page_83 = &buf[off];
+		ident_len = page_83[3];
+		if (!ident_len) {
+			printk(KERN_ERR "page_83[3]: identifier"
+					" length zero!\n");
+			break;
+		}
+		printk(KERN_INFO "T10 VPD Identifer Length: %d\n", ident_len);
+
+		vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
+		if (!vpd) {
+			printk(KERN_ERR "Unable to allocate memory for"
+					" struct t10_vpd\n");
+			goto out;
+		}
+		INIT_LIST_HEAD(&vpd->vpd_list);
+
+		transport_set_vpd_proto_id(vpd, page_83);
+		transport_set_vpd_assoc(vpd, page_83);
+
+		if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
+			off += (ident_len + 4);
+			page_len -= (ident_len + 4);
+			kfree(vpd);
+			continue;
+		}
+		if (transport_set_vpd_ident(vpd, page_83) < 0) {
+			off += (ident_len + 4);
+			page_len -= (ident_len + 4);
+			kfree(vpd);
+			continue;
+		}
+
+		list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
+		off += (ident_len + 4);
+		page_len -= (ident_len + 4);
+	}
+
+out:
+	kfree(buf);
+}
+
+/*	pscsi_add_device_to_list():
+ *
+ *
+ */
+static struct se_device *pscsi_add_device_to_list(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	struct pscsi_dev_virt *pdv,
+	struct scsi_device *sd,
+	int dev_flags)
+{
+	struct se_device *dev;
+	struct se_dev_limits dev_limits;
+	struct request_queue *q;
+	struct queue_limits *limits;
+
+	memset(&dev_limits, 0, sizeof(struct se_dev_limits));
+
+	if (!sd->queue_depth) {
+		sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
+
+		printk(KERN_ERR "Set broken SCSI Device %d:%d:%d"
+			" queue_depth to %d\n", sd->channel, sd->id,
+				sd->lun, sd->queue_depth);
+	}
+	/*
+	 * Setup the local scope queue_limits from struct request_queue->limits
+	 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
+	 */
+	q = sd->request_queue;
+	limits = &dev_limits.limits;
+	limits->logical_block_size = sd->sector_size;
+	limits->max_hw_sectors = (sd->host->max_sectors > queue_max_hw_sectors(q)) ?
+				  queue_max_hw_sectors(q) : sd->host->max_sectors;
+	limits->max_sectors = (sd->host->max_sectors > queue_max_sectors(q)) ?
+				  queue_max_sectors(q) : sd->host->max_sectors;
+	dev_limits.hw_queue_depth = sd->queue_depth;
+	dev_limits.queue_depth = sd->queue_depth;
+	/*
+	 * Setup our standard INQUIRY info into se_dev->t10_wwn
+	 */
+	pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
+
+	/*
+	 * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
+	 * which has already been referenced with Linux SCSI code with
+	 * scsi_device_get() in this file's pscsi_create_virtdevice().
+	 *
+	 * The passthrough operations called by the transport_add_device_*
+	 * function below will require this pointer to be set for passthroug
+	 *  ops.
+	 *
+	 * For the shutdown case in pscsi_free_device(), this struct
+	 * scsi_device  reference is released with Linux SCSI code
+	 * scsi_device_put() and the pdv->pdv_sd cleared.
+	 */
+	pdv->pdv_sd = sd;
+
+	dev = transport_add_device_to_core_hba(hba, &pscsi_template,
+				se_dev, dev_flags, (void *)pdv,
+				&dev_limits, NULL, NULL);
+	if (!(dev)) {
+		pdv->pdv_sd = NULL;
+		return NULL;
+	}
+
+	/*
+	 * Locate VPD WWN Information used for various purposes within
+	 * the Storage Engine.
+	 */
+	if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
+		/*
+		 * If VPD Unit Serial returned GOOD status, try
+		 * VPD Device Identification page (0x83).
+		 */
+		pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
+	}
+
+	/*
+	 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
+	 */
+	if (sd->type == TYPE_TAPE)
+		pscsi_tape_read_blocksize(dev, sd);
+	return dev;
+}
+
+static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
+{
+	struct pscsi_dev_virt *pdv;
+
+	pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
+	if (!(pdv)) {
+		printk(KERN_ERR "Unable to allocate memory for struct pscsi_dev_virt\n");
+		return NULL;
+	}
+	pdv->pdv_se_hba = hba;
+
+	printk(KERN_INFO "PSCSI: Allocated pdv: %p for %s\n", pdv, name);
+	return (void *)pdv;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static struct se_device *pscsi_create_type_disk(
+	struct scsi_device *sd,
+	struct pscsi_dev_virt *pdv,
+	struct se_subsystem_dev *se_dev,
+	struct se_hba *hba)
+{
+	struct se_device *dev;
+	struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
+	struct Scsi_Host *sh = sd->host;
+	struct block_device *bd;
+	u32 dev_flags = 0;
+
+	if (scsi_device_get(sd)) {
+		printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
+			sh->host_no, sd->channel, sd->id, sd->lun);
+		spin_unlock_irq(sh->host_lock);
+		return NULL;
+	}
+	spin_unlock_irq(sh->host_lock);
+	/*
+	 * Claim exclusive struct block_device access to struct scsi_device
+	 * for TYPE_DISK using supplied udev_path
+	 */
+	bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
+				FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
+	if (!(bd)) {
+		printk("pSCSI: blkdev_get_by_path() failed\n");
+		scsi_device_put(sd);
+		return NULL;
+	}
+	pdv->pdv_bd = bd;
+
+	dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+	if (!(dev)) {
+		blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
+		scsi_device_put(sd);
+		return NULL;
+	}
+	printk(KERN_INFO "CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
+		phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
+
+	return dev;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static struct se_device *pscsi_create_type_rom(
+	struct scsi_device *sd,
+	struct pscsi_dev_virt *pdv,
+	struct se_subsystem_dev *se_dev,
+	struct se_hba *hba)
+{
+	struct se_device *dev;
+	struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
+	struct Scsi_Host *sh = sd->host;
+	u32 dev_flags = 0;
+
+	if (scsi_device_get(sd)) {
+		printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
+			sh->host_no, sd->channel, sd->id, sd->lun);
+		spin_unlock_irq(sh->host_lock);
+		return NULL;
+	}
+	spin_unlock_irq(sh->host_lock);
+
+	dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+	if (!(dev)) {
+		scsi_device_put(sd);
+		return NULL;
+	}
+	printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
+		phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
+		sd->channel, sd->id, sd->lun);
+
+	return dev;
+}
+
+/*
+ *Called with struct Scsi_Host->host_lock called.
+ */
+static struct se_device *pscsi_create_type_other(
+	struct scsi_device *sd,
+	struct pscsi_dev_virt *pdv,
+	struct se_subsystem_dev *se_dev,
+	struct se_hba *hba)
+{
+	struct se_device *dev;
+	struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
+	struct Scsi_Host *sh = sd->host;
+	u32 dev_flags = 0;
+
+	spin_unlock_irq(sh->host_lock);
+	dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+	if (!(dev))
+		return NULL;
+
+	printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
+		phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
+		sd->channel, sd->id, sd->lun);
+
+	return dev;
+}
+
+static struct se_device *pscsi_create_virtdevice(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	void *p)
+{
+	struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
+	struct se_device *dev;
+	struct scsi_device *sd;
+	struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
+	struct Scsi_Host *sh = phv->phv_lld_host;
+	int legacy_mode_enable = 0;
+
+	if (!(pdv)) {
+		printk(KERN_ERR "Unable to locate struct pscsi_dev_virt"
+				" parameter\n");
+		return NULL;
+	}
+	/*
+	 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
+	 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
+	 */
+	if (!(sh)) {
+		if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
+			printk(KERN_ERR "pSCSI: Unable to locate struct"
+				" Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
+			return NULL;
+		}
+		/*
+		 * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
+		 * reference, we enforce that udev_path has been set
+		 */
+		if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
+			printk(KERN_ERR "pSCSI: udev_path attribute has not"
+				" been set before ENABLE=1\n");
+			return NULL;
+		}
+		/*
+		 * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
+		 * use the original TCM hba ID to reference Linux/SCSI Host No
+		 * and enable for PHV_LLD_SCSI_HOST_NO mode.
+		 */
+		if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
+			spin_lock(&hba->device_lock);
+			if (!(list_empty(&hba->hba_dev_list))) {
+				printk(KERN_ERR "pSCSI: Unable to set hba_mode"
+					" with active devices\n");
+				spin_unlock(&hba->device_lock);
+				return NULL;
+			}
+			spin_unlock(&hba->device_lock);
+
+			if (pscsi_pmode_enable_hba(hba, 1) != 1)
+				return NULL;
+
+			legacy_mode_enable = 1;
+			hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
+			sh = phv->phv_lld_host;
+		} else {
+			sh = pscsi_get_sh(pdv->pdv_host_id);
+			if (!(sh)) {
+				printk(KERN_ERR "pSCSI: Unable to locate"
+					" pdv_host_id: %d\n", pdv->pdv_host_id);
+				return NULL;
+			}
+		}
+	} else {
+		if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
+			printk(KERN_ERR "pSCSI: PHV_VIRUTAL_HOST_ID set while"
+				" struct Scsi_Host exists\n");
+			return NULL;
+		}
+	}
+
+	spin_lock_irq(sh->host_lock);
+	list_for_each_entry(sd, &sh->__devices, siblings) {
+		if ((pdv->pdv_channel_id != sd->channel) ||
+		    (pdv->pdv_target_id != sd->id) ||
+		    (pdv->pdv_lun_id != sd->lun))
+			continue;
+		/*
+		 * Functions will release the held struct scsi_host->host_lock
+		 * before calling calling pscsi_add_device_to_list() to register
+		 * struct scsi_device with target_core_mod.
+		 */
+		switch (sd->type) {
+		case TYPE_DISK:
+			dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
+			break;
+		case TYPE_ROM:
+			dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
+			break;
+		default:
+			dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
+			break;
+		}
+
+		if (!(dev)) {
+			if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
+				scsi_host_put(sh);
+			else if (legacy_mode_enable) {
+				pscsi_pmode_enable_hba(hba, 0);
+				hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
+			}
+			pdv->pdv_sd = NULL;
+			return NULL;
+		}
+		return dev;
+	}
+	spin_unlock_irq(sh->host_lock);
+
+	printk(KERN_ERR "pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
+		pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);
+
+	if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
+		scsi_host_put(sh);
+	else if (legacy_mode_enable) {
+		pscsi_pmode_enable_hba(hba, 0);
+		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
+	}
+
+	return NULL;
+}
+
+/*	pscsi_free_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void pscsi_free_device(void *p)
+{
+	struct pscsi_dev_virt *pdv = p;
+	struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
+	struct scsi_device *sd = pdv->pdv_sd;
+
+	if (sd) {
+		/*
+		 * Release exclusive pSCSI internal struct block_device claim for
+		 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
+		 */
+		if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
+			blkdev_put(pdv->pdv_bd,
+				   FMODE_WRITE|FMODE_READ|FMODE_EXCL);
+			pdv->pdv_bd = NULL;
+		}
+		/*
+		 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
+		 * to struct Scsi_Host now.
+		 */
+		if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
+		    (phv->phv_lld_host != NULL))
+			scsi_host_put(phv->phv_lld_host);
+
+		if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
+			scsi_device_put(sd);
+
+		pdv->pdv_sd = NULL;
+	}
+
+	kfree(pdv);
+}
+
+static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task)
+{
+	return container_of(task, struct pscsi_plugin_task, pscsi_task);
+}
+
+
+/*	pscsi_transport_complete():
+ *
+ *
+ */
+static int pscsi_transport_complete(struct se_task *task)
+{
+	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+	struct scsi_device *sd = pdv->pdv_sd;
+	int result;
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+	unsigned char *cdb = &pt->pscsi_cdb[0];
+
+	result = pt->pscsi_result;
+	/*
+	 * Hack to make sure that Write-Protect modepage is set if R/O mode is
+	 * forced.
+	 */
+	if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
+	     (status_byte(result) << 1) == SAM_STAT_GOOD) {
+		if (!TASK_CMD(task)->se_deve)
+			goto after_mode_sense;
+
+		if (TASK_CMD(task)->se_deve->lun_flags &
+				TRANSPORT_LUNFLAGS_READ_ONLY) {
+			unsigned char *buf = (unsigned char *)
+				T_TASK(task->task_se_cmd)->t_task_buf;
+
+			if (cdb[0] == MODE_SENSE_10) {
+				if (!(buf[3] & 0x80))
+					buf[3] |= 0x80;
+			} else {
+				if (!(buf[2] & 0x80))
+					buf[2] |= 0x80;
+			}
+		}
+	}
+after_mode_sense:
+
+	if (sd->type != TYPE_TAPE)
+		goto after_mode_select;
+
+	/*
+	 * Hack to correctly obtain the initiator requested blocksize for
+	 * TYPE_TAPE.  Since this value is dependent upon each tape media,
+	 * struct scsi_device->sector_size will not contain the correct value
+	 * by default, so we go ahead and set it so
+	 * TRANSPORT(dev)->get_blockdev() returns the correct value to the
+	 * storage engine.
+	 */
+	if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
+	      (status_byte(result) << 1) == SAM_STAT_GOOD) {
+		unsigned char *buf;
+		struct scatterlist *sg = task->task_sg;
+		u16 bdl;
+		u32 blocksize;
+
+		buf = sg_virt(&sg[0]);
+		if (!(buf)) {
+			printk(KERN_ERR "Unable to get buf for scatterlist\n");
+			goto after_mode_select;
+		}
+
+		if (cdb[0] == MODE_SELECT)
+			bdl = (buf[3]);
+		else
+			bdl = (buf[6] << 8) | (buf[7]);
+
+		if (!bdl)
+			goto after_mode_select;
+
+		if (cdb[0] == MODE_SELECT)
+			blocksize = (buf[9] << 16) | (buf[10] << 8) |
+					(buf[11]);
+		else
+			blocksize = (buf[13] << 16) | (buf[14] << 8) |
+					(buf[15]);
+
+		sd->sector_size = blocksize;
+	}
+after_mode_select:
+
+	if (status_byte(result) & CHECK_CONDITION)
+		return 1;
+
+	return 0;
+}
+
+static struct se_task *
+pscsi_alloc_task(struct se_cmd *cmd)
+{
+	struct pscsi_plugin_task *pt;
+	unsigned char *cdb = T_TASK(cmd)->t_task_cdb;
+
+	pt = kzalloc(sizeof(struct pscsi_plugin_task), GFP_KERNEL);
+	if (!pt) {
+		printk(KERN_ERR "Unable to allocate struct pscsi_plugin_task\n");
+		return NULL;
+	}
+
+	/*
+	 * If TCM Core is signaling a > TCM_MAX_COMMAND_SIZE allocation,
+	 * allocate the extended CDB buffer for per struct se_task context
+	 * pt->pscsi_cdb now.
+	 */
+	if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb) {
+
+		pt->pscsi_cdb = kzalloc(scsi_command_size(cdb), GFP_KERNEL);
+		if (!(pt->pscsi_cdb)) {
+			printk(KERN_ERR "pSCSI: Unable to allocate extended"
+					" pt->pscsi_cdb\n");
+			return NULL;
+		}
+	} else
+		pt->pscsi_cdb = &pt->__pscsi_cdb[0];
+
+	return &pt->pscsi_task;
+}
+
+static inline void pscsi_blk_init_request(
+	struct se_task *task,
+	struct pscsi_plugin_task *pt,
+	struct request *req,
+	int bidi_read)
+{
+	/*
+	 * Defined as "scsi command" in include/linux/blkdev.h.
+	 */
+	req->cmd_type = REQ_TYPE_BLOCK_PC;
+	/*
+	 * For the extra BIDI-COMMAND READ struct request we do not
+	 * need to setup the remaining structure members
+	 */
+	if (bidi_read)
+		return;
+	/*
+	 * Setup the done function pointer for struct request,
+	 * also set the end_io_data pointer.to struct se_task.
+	 */
+	req->end_io = pscsi_req_done;
+	req->end_io_data = (void *)task;
+	/*
+	 * Load the referenced struct se_task's SCSI CDB into
+	 * include/linux/blkdev.h:struct request->cmd
+	 */
+	req->cmd_len = scsi_command_size(pt->pscsi_cdb);
+	req->cmd = &pt->pscsi_cdb[0];
+	/*
+	 * Setup pointer for outgoing sense data.
+	 */
+	req->sense = (void *)&pt->pscsi_sense[0];
+	req->sense_len = 0;
+}
+
+/*
+ * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
+*/
+static int pscsi_blk_get_request(struct se_task *task)
+{
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+
+	pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
+			(task->task_data_direction == DMA_TO_DEVICE),
+			GFP_KERNEL);
+	if (!(pt->pscsi_req) || IS_ERR(pt->pscsi_req)) {
+		printk(KERN_ERR "PSCSI: blk_get_request() failed: %ld\n",
+				IS_ERR(pt->pscsi_req));
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	/*
+	 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
+	 * and setup rq callback, CDB and sense.
+	 */
+	pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
+	return 0;
+}
+
+/*      pscsi_do_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int pscsi_do_task(struct se_task *task)
+{
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+	/*
+	 * Set the struct request->timeout value based on peripheral
+	 * device type from SCSI.
+	 */
+	if (pdv->pdv_sd->type == TYPE_DISK)
+		pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
+	else
+		pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
+
+	pt->pscsi_req->retries = PS_RETRY;
+	/*
+	 * Queue the struct request into the struct scsi_device->request_queue.
+	 * Also check for HEAD_OF_QUEUE SAM TASK attr from received se_cmd
+	 * descriptor
+	 */
+	blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, pt->pscsi_req,
+			(task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ),
+			pscsi_req_done);
+
+	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+static void pscsi_free_task(struct se_task *task)
+{
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+	struct se_cmd *cmd = task->task_se_cmd;
+
+	/*
+	 * Release the extended CDB allocation from pscsi_alloc_task()
+	 * if one exists.
+	 */
+	if (T_TASK(cmd)->t_task_cdb != T_TASK(cmd)->__t_task_cdb)
+		kfree(pt->pscsi_cdb);
+	/*
+	 * We do not release the bio(s) here associated with this task, as
+	 * this is handled by bio_put() and pscsi_bi_endio().
+	 */
+	kfree(pt);
+}
+
+enum {
+	Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
+	Opt_scsi_lun_id, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_scsi_host_id, "scsi_host_id=%d"},
+	{Opt_scsi_channel_id, "scsi_channel_id=%d"},
+	{Opt_scsi_target_id, "scsi_target_id=%d"},
+	{Opt_scsi_lun_id, "scsi_lun_id=%d"},
+	{Opt_err, NULL}
+};
+
+static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	const char *page,
+	ssize_t count)
+{
+	struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
+	struct pscsi_hba_virt *phv = hba->hba_ptr;
+	char *orig, *ptr, *opts;
+	substring_t args[MAX_OPT_ARGS];
+	int ret = 0, arg, token;
+
+	opts = kstrdup(page, GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	orig = opts;
+
+	while ((ptr = strsep(&opts, ",")) != NULL) {
+		if (!*ptr)
+			continue;
+
+		token = match_token(ptr, tokens, args);
+		switch (token) {
+		case Opt_scsi_host_id:
+			if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
+				printk(KERN_ERR "PSCSI[%d]: Unable to accept"
+					" scsi_host_id while phv_mode =="
+					" PHV_LLD_SCSI_HOST_NO\n",
+					phv->phv_host_id);
+				ret = -EINVAL;
+				goto out;
+			}
+			match_int(args, &arg);
+			pdv->pdv_host_id = arg;
+			printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Host ID:"
+				" %d\n", phv->phv_host_id, pdv->pdv_host_id);
+			pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
+			break;
+		case Opt_scsi_channel_id:
+			match_int(args, &arg);
+			pdv->pdv_channel_id = arg;
+			printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Channel"
+				" ID: %d\n",  phv->phv_host_id,
+				pdv->pdv_channel_id);
+			pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
+			break;
+		case Opt_scsi_target_id:
+			match_int(args, &arg);
+			pdv->pdv_target_id = arg;
+			printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Target"
+				" ID: %d\n", phv->phv_host_id,
+				pdv->pdv_target_id);
+			pdv->pdv_flags |= PDF_HAS_TARGET_ID;
+			break;
+		case Opt_scsi_lun_id:
+			match_int(args, &arg);
+			pdv->pdv_lun_id = arg;
+			printk(KERN_INFO "PSCSI[%d]: Referencing SCSI LUN ID:"
+				" %d\n", phv->phv_host_id, pdv->pdv_lun_id);
+			pdv->pdv_flags |= PDF_HAS_LUN_ID;
+			break;
+		default:
+			break;
+		}
+	}
+
+out:
+	kfree(orig);
+	return (!ret) ? count : ret;
+}
+
+static ssize_t pscsi_check_configfs_dev_params(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev)
+{
+	struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
+
+	if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
+	    !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
+	    !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
+		printk(KERN_ERR "Missing scsi_channel_id=, scsi_target_id= and"
+			" scsi_lun_id= parameters\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
+					      struct se_subsystem_dev *se_dev,
+					      char *b)
+{
+	struct pscsi_hba_virt *phv = hba->hba_ptr;
+        struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
+	struct scsi_device *sd = pdv->pdv_sd;
+	unsigned char host_id[16];
+	ssize_t bl;
+	int i;
+
+	if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
+		snprintf(host_id, 16, "%d", pdv->pdv_host_id);
+	else
+		snprintf(host_id, 16, "PHBA Mode");
+
+	bl = sprintf(b, "SCSI Device Bus Location:"
+		" Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
+		pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
+		host_id);
+
+	if (sd) {
+		bl += sprintf(b + bl, "        ");
+		bl += sprintf(b + bl, "Vendor: ");
+		for (i = 0; i < 8; i++) {
+			if (ISPRINT(sd->vendor[i]))   /* printable character? */
+				bl += sprintf(b + bl, "%c", sd->vendor[i]);
+			else
+				bl += sprintf(b + bl, " ");
+		}
+		bl += sprintf(b + bl, " Model: ");
+		for (i = 0; i < 16; i++) {
+			if (ISPRINT(sd->model[i]))   /* printable character ? */
+				bl += sprintf(b + bl, "%c", sd->model[i]);
+			else
+				bl += sprintf(b + bl, " ");
+		}
+		bl += sprintf(b + bl, " Rev: ");
+		for (i = 0; i < 4; i++) {
+			if (ISPRINT(sd->rev[i]))   /* printable character ? */
+				bl += sprintf(b + bl, "%c", sd->rev[i]);
+			else
+				bl += sprintf(b + bl, " ");
+		}
+		bl += sprintf(b + bl, "\n");
+	}
+	return bl;
+}
+
+static void pscsi_bi_endio(struct bio *bio, int error)
+{
+	bio_put(bio);
+}
+
+static inline struct bio *pscsi_get_bio(struct pscsi_dev_virt *pdv, int sg_num)
+{
+	struct bio *bio;
+	/*
+	 * Use bio_malloc() following the comment in for bio -> struct request
+	 * in block/blk-core.c:blk_make_request()
+	 */
+	bio = bio_kmalloc(GFP_KERNEL, sg_num);
+	if (!(bio)) {
+		printk(KERN_ERR "PSCSI: bio_kmalloc() failed\n");
+		return NULL;
+	}
+	bio->bi_end_io = pscsi_bi_endio;
+
+	return bio;
+}
+
+#if 0
+#define DEBUG_PSCSI(x...) printk(x)
+#else
+#define DEBUG_PSCSI(x...)
+#endif
+
+static int __pscsi_map_task_SG(
+	struct se_task *task,
+	struct scatterlist *task_sg,
+	u32 task_sg_num,
+	int bidi_read)
+{
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+	struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
+	struct page *page;
+	struct scatterlist *sg;
+	u32 data_len = task->task_size, i, len, bytes, off;
+	int nr_pages = (task->task_size + task_sg[0].offset +
+			PAGE_SIZE - 1) >> PAGE_SHIFT;
+	int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+	int rw = (task->task_data_direction == DMA_TO_DEVICE);
+
+	if (!task->task_size)
+		return 0;
+	/*
+	 * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
+	 * the bio_vec maplist from TC< struct se_mem -> task->task_sg ->
+	 * struct scatterlist memory.  The struct se_task->task_sg[] currently needs
+	 * to be attached to struct bios for submission to Linux/SCSI using
+	 * struct request to struct scsi_device->request_queue.
+	 *
+	 * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
+	 * is ported to upstream SCSI passthrough functionality that accepts
+	 * struct scatterlist->page_link or struct page as a paraemeter.
+	 */
+	DEBUG_PSCSI("PSCSI: nr_pages: %d\n", nr_pages);
+
+	for_each_sg(task_sg, sg, task_sg_num, i) {
+		page = sg_page(sg);
+		off = sg->offset;
+		len = sg->length;
+
+		DEBUG_PSCSI("PSCSI: i: %d page: %p len: %d off: %d\n", i,
+			page, len, off);
+
+		while (len > 0 && data_len > 0) {
+			bytes = min_t(unsigned int, len, PAGE_SIZE - off);
+			bytes = min(bytes, data_len);
+
+			if (!(bio)) {
+				nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
+				nr_pages -= nr_vecs;
+				/*
+				 * Calls bio_kmalloc() and sets bio->bi_end_io()
+				 */
+				bio = pscsi_get_bio(pdv, nr_vecs);
+				if (!(bio))
+					goto fail;
+
+				if (rw)
+					bio->bi_rw |= REQ_WRITE;
+
+				DEBUG_PSCSI("PSCSI: Allocated bio: %p,"
+					" dir: %s nr_vecs: %d\n", bio,
+					(rw) ? "rw" : "r", nr_vecs);
+				/*
+				 * Set *hbio pointer to handle the case:
+				 * nr_pages > BIO_MAX_PAGES, where additional
+				 * bios need to be added to complete a given
+				 * struct se_task
+				 */
+				if (!hbio)
+					hbio = tbio = bio;
+				else
+					tbio = tbio->bi_next = bio;
+			}
+
+			DEBUG_PSCSI("PSCSI: Calling bio_add_pc_page() i: %d"
+				" bio: %p page: %p len: %d off: %d\n", i, bio,
+				page, len, off);
+
+			rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
+					bio, page, bytes, off);
+			if (rc != bytes)
+				goto fail;
+
+			DEBUG_PSCSI("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
+				bio->bi_vcnt, nr_vecs);
+
+			if (bio->bi_vcnt > nr_vecs) {
+				DEBUG_PSCSI("PSCSI: Reached bio->bi_vcnt max:"
+					" %d i: %d bio: %p, allocating another"
+					" bio\n", bio->bi_vcnt, i, bio);
+				/*
+				 * Clear the pointer so that another bio will
+				 * be allocated with pscsi_get_bio() above, the
+				 * current bio has already been set *tbio and
+				 * bio->bi_next.
+				 */
+				bio = NULL;
+			}
+
+			page++;
+			len -= bytes;
+			data_len -= bytes;
+			off = 0;
+		}
+	}
+	/*
+	 * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND
+	 * primary SCSI WRITE poayload mapped for struct se_task->task_sg[]
+	 */
+	if (!(bidi_read)) {
+		/*
+		 * Starting with v2.6.31, call blk_make_request() passing in *hbio to
+		 * allocate the pSCSI task a struct request.
+		 */
+		pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
+					hbio, GFP_KERNEL);
+		if (!(pt->pscsi_req)) {
+			printk(KERN_ERR "pSCSI: blk_make_request() failed\n");
+			goto fail;
+		}
+		/*
+		 * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
+		 * and setup rq callback, CDB and sense.
+		 */
+		pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
+
+		return task->task_sg_num;
+	}
+	/*
+	 * Setup the secondary pt->pscsi_req->next_rq used for the extra BIDI-COMMAND
+	 * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[]
+	 */
+	pt->pscsi_req->next_rq = blk_make_request(pdv->pdv_sd->request_queue,
+					hbio, GFP_KERNEL);
+	if (!(pt->pscsi_req->next_rq)) {
+		printk(KERN_ERR "pSCSI: blk_make_request() failed for BIDI\n");
+		goto fail;
+	}
+	pscsi_blk_init_request(task, pt, pt->pscsi_req->next_rq, 1);
+
+	return task->task_sg_num;
+fail:
+	while (hbio) {
+		bio = hbio;
+		hbio = hbio->bi_next;
+		bio->bi_next = NULL;
+		bio_endio(bio, 0);
+	}
+	return ret;
+}
+
+static int pscsi_map_task_SG(struct se_task *task)
+{
+	int ret;
+
+	/*
+	 * Setup the main struct request for the task->task_sg[] payload
+	 */
+
+	ret = __pscsi_map_task_SG(task, task->task_sg, task->task_sg_num, 0);
+	if (ret >= 0 && task->task_sg_bidi) {
+		/*
+		 * If present, set up the extra BIDI-COMMAND SCSI READ
+		 * struct request and payload.
+		 */
+		ret = __pscsi_map_task_SG(task, task->task_sg_bidi,
+					task->task_sg_num, 1);
+	}
+
+	if (ret < 0)
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	return 0;
+}
+
+/*	pscsi_map_task_non_SG():
+ *
+ *
+ */
+static int pscsi_map_task_non_SG(struct se_task *task)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+	struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr;
+	int ret = 0;
+
+	if (pscsi_blk_get_request(task) < 0)
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+	if (!task->task_size)
+		return 0;
+
+	ret = blk_rq_map_kern(pdv->pdv_sd->request_queue,
+			pt->pscsi_req, T_TASK(cmd)->t_task_buf,
+			task->task_size, GFP_KERNEL);
+	if (ret < 0) {
+		printk(KERN_ERR "PSCSI: blk_rq_map_kern() failed: %d\n", ret);
+		return PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+	return 0;
+}
+
+static int pscsi_CDB_none(struct se_task *task)
+{
+	return pscsi_blk_get_request(task);
+}
+
+/*	pscsi_get_cdb():
+ *
+ *
+ */
+static unsigned char *pscsi_get_cdb(struct se_task *task)
+{
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+
+	return pt->pscsi_cdb;
+}
+
+/*	pscsi_get_sense_buffer():
+ *
+ *
+ */
+static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
+{
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+
+	return (unsigned char *)&pt->pscsi_sense[0];
+}
+
+/*	pscsi_get_device_rev():
+ *
+ *
+ */
+static u32 pscsi_get_device_rev(struct se_device *dev)
+{
+	struct pscsi_dev_virt *pdv = dev->dev_ptr;
+	struct scsi_device *sd = pdv->pdv_sd;
+
+	return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
+}
+
+/*	pscsi_get_device_type():
+ *
+ *
+ */
+static u32 pscsi_get_device_type(struct se_device *dev)
+{
+	struct pscsi_dev_virt *pdv = dev->dev_ptr;
+	struct scsi_device *sd = pdv->pdv_sd;
+
+	return sd->type;
+}
+
+static sector_t pscsi_get_blocks(struct se_device *dev)
+{
+	struct pscsi_dev_virt *pdv = dev->dev_ptr;
+
+	if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
+		return pdv->pdv_bd->bd_part->nr_sects;
+
+	dump_stack();
+	return 0;
+}
+
+/*	pscsi_handle_SAM_STATUS_failures():
+ *
+ *
+ */
+static inline void pscsi_process_SAM_status(
+	struct se_task *task,
+	struct pscsi_plugin_task *pt)
+{
+	task->task_scsi_status = status_byte(pt->pscsi_result);
+	if ((task->task_scsi_status)) {
+		task->task_scsi_status <<= 1;
+		printk(KERN_INFO "PSCSI Status Byte exception at task: %p CDB:"
+			" 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
+			pt->pscsi_result);
+	}
+
+	switch (host_byte(pt->pscsi_result)) {
+	case DID_OK:
+		transport_complete_task(task, (!task->task_scsi_status));
+		break;
+	default:
+		printk(KERN_INFO "PSCSI Host Byte exception at task: %p CDB:"
+			" 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
+			pt->pscsi_result);
+		task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
+		task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+		TASK_CMD(task)->transport_error_status =
+					PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+		transport_complete_task(task, 0);
+		break;
+	}
+
+	return;
+}
+
+static void pscsi_req_done(struct request *req, int uptodate)
+{
+	struct se_task *task = req->end_io_data;
+	struct pscsi_plugin_task *pt = PSCSI_TASK(task);
+
+	pt->pscsi_result = req->errors;
+	pt->pscsi_resid = req->resid_len;
+
+	pscsi_process_SAM_status(task, pt);
+	/*
+	 * Release BIDI-READ if present
+	 */
+	if (req->next_rq != NULL)
+		__blk_put_request(req->q, req->next_rq);
+
+	__blk_put_request(req->q, req);
+	pt->pscsi_req = NULL;
+}
+
+static struct se_subsystem_api pscsi_template = {
+	.name			= "pscsi",
+	.owner			= THIS_MODULE,
+	.transport_type		= TRANSPORT_PLUGIN_PHBA_PDEV,
+	.cdb_none		= pscsi_CDB_none,
+	.map_task_non_SG	= pscsi_map_task_non_SG,
+	.map_task_SG		= pscsi_map_task_SG,
+	.attach_hba		= pscsi_attach_hba,
+	.detach_hba		= pscsi_detach_hba,
+	.pmode_enable_hba	= pscsi_pmode_enable_hba,
+	.allocate_virtdevice	= pscsi_allocate_virtdevice,
+	.create_virtdevice	= pscsi_create_virtdevice,
+	.free_device		= pscsi_free_device,
+	.transport_complete	= pscsi_transport_complete,
+	.alloc_task		= pscsi_alloc_task,
+	.do_task		= pscsi_do_task,
+	.free_task		= pscsi_free_task,
+	.check_configfs_dev_params = pscsi_check_configfs_dev_params,
+	.set_configfs_dev_params = pscsi_set_configfs_dev_params,
+	.show_configfs_dev_params = pscsi_show_configfs_dev_params,
+	.get_cdb		= pscsi_get_cdb,
+	.get_sense_buffer	= pscsi_get_sense_buffer,
+	.get_device_rev		= pscsi_get_device_rev,
+	.get_device_type	= pscsi_get_device_type,
+	.get_blocks		= pscsi_get_blocks,
+};
+
+static int __init pscsi_module_init(void)
+{
+	return transport_subsystem_register(&pscsi_template);
+}
+
+static void pscsi_module_exit(void)
+{
+	transport_subsystem_release(&pscsi_template);
+}
+
+MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
+MODULE_AUTHOR("nab@Linux-iSCSI.org");
+MODULE_LICENSE("GPL");
+
+module_init(pscsi_module_init);
+module_exit(pscsi_module_exit);
diff --git a/drivers/target/target_core_pscsi.h b/drivers/target/target_core_pscsi.h
new file mode 100644
index 0000000..a4cd5d3
--- /dev/null
+++ b/drivers/target/target_core_pscsi.h
@@ -0,0 +1,65 @@
+#ifndef TARGET_CORE_PSCSI_H
+#define TARGET_CORE_PSCSI_H
+
+#define PSCSI_VERSION		"v4.0"
+#define PSCSI_VIRTUAL_HBA_DEPTH	2048
+
+/* used in pscsi_find_alloc_len() */
+#ifndef INQUIRY_DATA_SIZE
+#define INQUIRY_DATA_SIZE	0x24
+#endif
+
+/* used in pscsi_add_device_to_list() */
+#define PSCSI_DEFAULT_QUEUEDEPTH	1
+
+#define PS_RETRY		5
+#define PS_TIMEOUT_DISK		(15*HZ)
+#define PS_TIMEOUT_OTHER	(500*HZ)
+
+#include <linux/device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_device.h>
+#include <linux/kref.h>
+#include <linux/kobject.h>
+
+struct pscsi_plugin_task {
+	struct se_task pscsi_task;
+	unsigned char *pscsi_cdb;
+	unsigned char __pscsi_cdb[TCM_MAX_COMMAND_SIZE];
+	unsigned char pscsi_sense[SCSI_SENSE_BUFFERSIZE];
+	int	pscsi_direction;
+	int	pscsi_result;
+	u32	pscsi_resid;
+	struct request *pscsi_req;
+} ____cacheline_aligned;
+
+#define PDF_HAS_CHANNEL_ID	0x01
+#define PDF_HAS_TARGET_ID	0x02
+#define PDF_HAS_LUN_ID		0x04
+#define PDF_HAS_VPD_UNIT_SERIAL 0x08
+#define PDF_HAS_VPD_DEV_IDENT	0x10
+#define PDF_HAS_VIRT_HOST_ID	0x20
+
+struct pscsi_dev_virt {
+	int	pdv_flags;
+	int	pdv_host_id;
+	int	pdv_channel_id;
+	int	pdv_target_id;
+	int	pdv_lun_id;
+	struct block_device *pdv_bd;
+	struct scsi_device *pdv_sd;
+	struct se_hba *pdv_se_hba;
+} ____cacheline_aligned;
+
+typedef enum phv_modes {
+	PHV_VIRUTAL_HOST_ID,
+	PHV_LLD_SCSI_HOST_NO
+} phv_modes_t;
+
+struct pscsi_hba_virt {
+	int			phv_host_id;
+	phv_modes_t		phv_mode;
+	struct Scsi_Host	*phv_lld_host;
+} ____cacheline_aligned;
+
+#endif   /*** TARGET_CORE_PSCSI_H ***/
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
new file mode 100644
index 0000000..979aebf
--- /dev/null
+++ b/drivers/target/target_core_rd.c
@@ -0,0 +1,1091 @@
+/*******************************************************************************
+ * Filename:  target_core_rd.c
+ *
+ * This file contains the Storage Engine <-> Ramdisk transport
+ * specific functions.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/timer.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+
+#include "target_core_rd.h"
+
+static struct se_subsystem_api rd_dr_template;
+static struct se_subsystem_api rd_mcp_template;
+
+/* #define DEBUG_RAMDISK_MCP */
+/* #define DEBUG_RAMDISK_DR */
+
+/*	rd_attach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int rd_attach_hba(struct se_hba *hba, u32 host_id)
+{
+	struct rd_host *rd_host;
+
+	rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
+	if (!(rd_host)) {
+		printk(KERN_ERR "Unable to allocate memory for struct rd_host\n");
+		return -ENOMEM;
+	}
+
+	rd_host->rd_host_id = host_id;
+
+	atomic_set(&hba->left_queue_depth, RD_HBA_QUEUE_DEPTH);
+	atomic_set(&hba->max_queue_depth, RD_HBA_QUEUE_DEPTH);
+	hba->hba_ptr = (void *) rd_host;
+
+	printk(KERN_INFO "CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
+		" Generic Target Core Stack %s\n", hba->hba_id,
+		RD_HBA_VERSION, TARGET_CORE_MOD_VERSION);
+	printk(KERN_INFO "CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic"
+		" Target Core TCQ Depth: %d MaxSectors: %u\n", hba->hba_id,
+		rd_host->rd_host_id, atomic_read(&hba->max_queue_depth),
+		RD_MAX_SECTORS);
+
+	return 0;
+}
+
+static void rd_detach_hba(struct se_hba *hba)
+{
+	struct rd_host *rd_host = hba->hba_ptr;
+
+	printk(KERN_INFO "CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
+		" Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);
+
+	kfree(rd_host);
+	hba->hba_ptr = NULL;
+}
+
+/*	rd_release_device_space():
+ *
+ *
+ */
+static void rd_release_device_space(struct rd_dev *rd_dev)
+{
+	u32 i, j, page_count = 0, sg_per_table;
+	struct rd_dev_sg_table *sg_table;
+	struct page *pg;
+	struct scatterlist *sg;
+
+	if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
+		return;
+
+	sg_table = rd_dev->sg_table_array;
+
+	for (i = 0; i < rd_dev->sg_table_count; i++) {
+		sg = sg_table[i].sg_table;
+		sg_per_table = sg_table[i].rd_sg_count;
+
+		for (j = 0; j < sg_per_table; j++) {
+			pg = sg_page(&sg[j]);
+			if ((pg)) {
+				__free_page(pg);
+				page_count++;
+			}
+		}
+
+		kfree(sg);
+	}
+
+	printk(KERN_INFO "CORE_RD[%u] - Released device space for Ramdisk"
+		" Device ID: %u, pages %u in %u tables total bytes %lu\n",
+		rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
+		rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
+
+	kfree(sg_table);
+	rd_dev->sg_table_array = NULL;
+	rd_dev->sg_table_count = 0;
+}
+
+
+/*	rd_build_device_space():
+ *
+ *
+ */
+static int rd_build_device_space(struct rd_dev *rd_dev)
+{
+	u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed;
+	u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
+				sizeof(struct scatterlist));
+	struct rd_dev_sg_table *sg_table;
+	struct page *pg;
+	struct scatterlist *sg;
+
+	if (rd_dev->rd_page_count <= 0) {
+		printk(KERN_ERR "Illegal page count: %u for Ramdisk device\n",
+			rd_dev->rd_page_count);
+		return -1;
+	}
+	total_sg_needed = rd_dev->rd_page_count;
+
+	sg_tables = (total_sg_needed / max_sg_per_table) + 1;
+
+	sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
+	if (!(sg_table)) {
+		printk(KERN_ERR "Unable to allocate memory for Ramdisk"
+			" scatterlist tables\n");
+		return -1;
+	}
+
+	rd_dev->sg_table_array = sg_table;
+	rd_dev->sg_table_count = sg_tables;
+
+	while (total_sg_needed) {
+		sg_per_table = (total_sg_needed > max_sg_per_table) ?
+			max_sg_per_table : total_sg_needed;
+
+		sg = kzalloc(sg_per_table * sizeof(struct scatterlist),
+				GFP_KERNEL);
+		if (!(sg)) {
+			printk(KERN_ERR "Unable to allocate scatterlist array"
+				" for struct rd_dev\n");
+			return -1;
+		}
+
+		sg_init_table((struct scatterlist *)&sg[0], sg_per_table);
+
+		sg_table[i].sg_table = sg;
+		sg_table[i].rd_sg_count = sg_per_table;
+		sg_table[i].page_start_offset = page_offset;
+		sg_table[i++].page_end_offset = (page_offset + sg_per_table)
+						- 1;
+
+		for (j = 0; j < sg_per_table; j++) {
+			pg = alloc_pages(GFP_KERNEL, 0);
+			if (!(pg)) {
+				printk(KERN_ERR "Unable to allocate scatterlist"
+					" pages for struct rd_dev_sg_table\n");
+				return -1;
+			}
+			sg_assign_page(&sg[j], pg);
+			sg[j].length = PAGE_SIZE;
+		}
+
+		page_offset += sg_per_table;
+		total_sg_needed -= sg_per_table;
+	}
+
+	printk(KERN_INFO "CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
+		" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
+		rd_dev->rd_dev_id, rd_dev->rd_page_count,
+		rd_dev->sg_table_count);
+
+	return 0;
+}
+
+static void *rd_allocate_virtdevice(
+	struct se_hba *hba,
+	const char *name,
+	int rd_direct)
+{
+	struct rd_dev *rd_dev;
+	struct rd_host *rd_host = hba->hba_ptr;
+
+	rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
+	if (!(rd_dev)) {
+		printk(KERN_ERR "Unable to allocate memory for struct rd_dev\n");
+		return NULL;
+	}
+
+	rd_dev->rd_host = rd_host;
+	rd_dev->rd_direct = rd_direct;
+
+	return rd_dev;
+}
+
+static void *rd_DIRECT_allocate_virtdevice(struct se_hba *hba, const char *name)
+{
+	return rd_allocate_virtdevice(hba, name, 1);
+}
+
+static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name)
+{
+	return rd_allocate_virtdevice(hba, name, 0);
+}
+
+/*	rd_create_virtdevice():
+ *
+ *
+ */
+static struct se_device *rd_create_virtdevice(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	void *p,
+	int rd_direct)
+{
+	struct se_device *dev;
+	struct se_dev_limits dev_limits;
+	struct rd_dev *rd_dev = p;
+	struct rd_host *rd_host = hba->hba_ptr;
+	int dev_flags = 0;
+	char prod[16], rev[4];
+
+	memset(&dev_limits, 0, sizeof(struct se_dev_limits));
+
+	if (rd_build_device_space(rd_dev) < 0)
+		goto fail;
+
+	snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP");
+	snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION :
+						RD_MCP_VERSION);
+
+	dev_limits.limits.logical_block_size = RD_BLOCKSIZE;
+	dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS;
+	dev_limits.limits.max_sectors = RD_MAX_SECTORS;
+	dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
+	dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH;
+
+	dev = transport_add_device_to_core_hba(hba,
+			(rd_dev->rd_direct) ? &rd_dr_template :
+			&rd_mcp_template, se_dev, dev_flags, (void *)rd_dev,
+			&dev_limits, prod, rev);
+	if (!(dev))
+		goto fail;
+
+	rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
+	rd_dev->rd_queue_depth = dev->queue_depth;
+
+	printk(KERN_INFO "CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of"
+		" %u pages in %u tables, %lu total bytes\n",
+		rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" :
+		"DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count,
+		rd_dev->sg_table_count,
+		(unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
+
+	return dev;
+
+fail:
+	rd_release_device_space(rd_dev);
+	return NULL;
+}
+
+static struct se_device *rd_DIRECT_create_virtdevice(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	void *p)
+{
+	return rd_create_virtdevice(hba, se_dev, p, 1);
+}
+
+static struct se_device *rd_MEMCPY_create_virtdevice(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	void *p)
+{
+	return rd_create_virtdevice(hba, se_dev, p, 0);
+}
+
+/*	rd_free_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void rd_free_device(void *p)
+{
+	struct rd_dev *rd_dev = p;
+
+	rd_release_device_space(rd_dev);
+	kfree(rd_dev);
+}
+
+static inline struct rd_request *RD_REQ(struct se_task *task)
+{
+	return container_of(task, struct rd_request, rd_task);
+}
+
+static struct se_task *
+rd_alloc_task(struct se_cmd *cmd)
+{
+	struct rd_request *rd_req;
+
+	rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL);
+	if (!rd_req) {
+		printk(KERN_ERR "Unable to allocate struct rd_request\n");
+		return NULL;
+	}
+	rd_req->rd_dev = SE_DEV(cmd)->dev_ptr;
+
+	return &rd_req->rd_task;
+}
+
+/*	rd_get_sg_table():
+ *
+ *
+ */
+static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
+{
+	u32 i;
+	struct rd_dev_sg_table *sg_table;
+
+	for (i = 0; i < rd_dev->sg_table_count; i++) {
+		sg_table = &rd_dev->sg_table_array[i];
+		if ((sg_table->page_start_offset <= page) &&
+		    (sg_table->page_end_offset >= page))
+			return sg_table;
+	}
+
+	printk(KERN_ERR "Unable to locate struct rd_dev_sg_table for page: %u\n",
+			page);
+
+	return NULL;
+}
+
+/*	rd_MEMCPY_read():
+ *
+ *
+ */
+static int rd_MEMCPY_read(struct rd_request *req)
+{
+	struct se_task *task = &req->rd_task;
+	struct rd_dev *dev = req->rd_dev;
+	struct rd_dev_sg_table *table;
+	struct scatterlist *sg_d, *sg_s;
+	void *dst, *src;
+	u32 i = 0, j = 0, dst_offset = 0, src_offset = 0;
+	u32 length, page_end = 0, table_sg_end;
+	u32 rd_offset = req->rd_offset;
+
+	table = rd_get_sg_table(dev, req->rd_page);
+	if (!(table))
+		return -1;
+
+	table_sg_end = (table->page_end_offset - req->rd_page);
+	sg_d = task->task_sg;
+	sg_s = &table->sg_table[req->rd_page - table->page_start_offset];
+#ifdef DEBUG_RAMDISK_MCP
+	printk(KERN_INFO "RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:"
+		" %u\n", dev->rd_dev_id, task->task_lba, req->rd_size,
+		req->rd_page, req->rd_offset);
+#endif
+	src_offset = rd_offset;
+
+	while (req->rd_size) {
+		if ((sg_d[i].length - dst_offset) <
+		    (sg_s[j].length - src_offset)) {
+			length = (sg_d[i].length - dst_offset);
+#ifdef DEBUG_RAMDISK_MCP
+			printk(KERN_INFO "Step 1 - sg_d[%d]: %p length: %d"
+				" offset: %u sg_s[%d].length: %u\n", i,
+				&sg_d[i], sg_d[i].length, sg_d[i].offset, j,
+				sg_s[j].length);
+			printk(KERN_INFO "Step 1 - length: %u dst_offset: %u"
+				" src_offset: %u\n", length, dst_offset,
+				src_offset);
+#endif
+			if (length > req->rd_size)
+				length = req->rd_size;
+
+			dst = sg_virt(&sg_d[i++]) + dst_offset;
+			if (!dst)
+				BUG();
+
+			src = sg_virt(&sg_s[j]) + src_offset;
+			if (!src)
+				BUG();
+
+			dst_offset = 0;
+			src_offset = length;
+			page_end = 0;
+		} else {
+			length = (sg_s[j].length - src_offset);
+#ifdef DEBUG_RAMDISK_MCP
+			printk(KERN_INFO "Step 2 - sg_d[%d]: %p length: %d"
+				" offset: %u sg_s[%d].length: %u\n", i,
+				&sg_d[i], sg_d[i].length, sg_d[i].offset,
+				j, sg_s[j].length);
+			printk(KERN_INFO "Step 2 - length: %u dst_offset: %u"
+				" src_offset: %u\n", length, dst_offset,
+				src_offset);
+#endif
+			if (length > req->rd_size)
+				length = req->rd_size;
+
+			dst = sg_virt(&sg_d[i]) + dst_offset;
+			if (!dst)
+				BUG();
+
+			if (sg_d[i].length == length) {
+				i++;
+				dst_offset = 0;
+			} else
+				dst_offset = length;
+
+			src = sg_virt(&sg_s[j++]) + src_offset;
+			if (!src)
+				BUG();
+
+			src_offset = 0;
+			page_end = 1;
+		}
+
+		memcpy(dst, src, length);
+
+#ifdef DEBUG_RAMDISK_MCP
+		printk(KERN_INFO "page: %u, remaining size: %u, length: %u,"
+			" i: %u, j: %u\n", req->rd_page,
+			(req->rd_size - length), length, i, j);
+#endif
+		req->rd_size -= length;
+		if (!(req->rd_size))
+			return 0;
+
+		if (!page_end)
+			continue;
+
+		if (++req->rd_page <= table->page_end_offset) {
+#ifdef DEBUG_RAMDISK_MCP
+			printk(KERN_INFO "page: %u in same page table\n",
+				req->rd_page);
+#endif
+			continue;
+		}
+#ifdef DEBUG_RAMDISK_MCP
+		printk(KERN_INFO "getting new page table for page: %u\n",
+				req->rd_page);
+#endif
+		table = rd_get_sg_table(dev, req->rd_page);
+		if (!(table))
+			return -1;
+
+		sg_s = &table->sg_table[j = 0];
+	}
+
+	return 0;
+}
+
+/*	rd_MEMCPY_write():
+ *
+ *
+ */
+static int rd_MEMCPY_write(struct rd_request *req)
+{
+	struct se_task *task = &req->rd_task;
+	struct rd_dev *dev = req->rd_dev;
+	struct rd_dev_sg_table *table;
+	struct scatterlist *sg_d, *sg_s;
+	void *dst, *src;
+	u32 i = 0, j = 0, dst_offset = 0, src_offset = 0;
+	u32 length, page_end = 0, table_sg_end;
+	u32 rd_offset = req->rd_offset;
+
+	table = rd_get_sg_table(dev, req->rd_page);
+	if (!(table))
+		return -1;
+
+	table_sg_end = (table->page_end_offset - req->rd_page);
+	sg_d = &table->sg_table[req->rd_page - table->page_start_offset];
+	sg_s = task->task_sg;
+#ifdef DEBUG_RAMDISK_MCP
+	printk(KERN_INFO "RD[%d] Write LBA: %llu, Size: %u, Page: %u,"
+		" Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size,
+		req->rd_page, req->rd_offset);
+#endif
+	dst_offset = rd_offset;
+
+	while (req->rd_size) {
+		if ((sg_s[i].length - src_offset) <
+		    (sg_d[j].length - dst_offset)) {
+			length = (sg_s[i].length - src_offset);
+#ifdef DEBUG_RAMDISK_MCP
+			printk(KERN_INFO "Step 1 - sg_s[%d]: %p length: %d"
+				" offset: %d sg_d[%d].length: %u\n", i,
+				&sg_s[i], sg_s[i].length, sg_s[i].offset,
+				j, sg_d[j].length);
+			printk(KERN_INFO "Step 1 - length: %u src_offset: %u"
+				" dst_offset: %u\n", length, src_offset,
+				dst_offset);
+#endif
+			if (length > req->rd_size)
+				length = req->rd_size;
+
+			src = sg_virt(&sg_s[i++]) + src_offset;
+			if (!src)
+				BUG();
+
+			dst = sg_virt(&sg_d[j]) + dst_offset;
+			if (!dst)
+				BUG();
+
+			src_offset = 0;
+			dst_offset = length;
+			page_end = 0;
+		} else {
+			length = (sg_d[j].length - dst_offset);
+#ifdef DEBUG_RAMDISK_MCP
+			printk(KERN_INFO "Step 2 - sg_s[%d]: %p length: %d"
+				" offset: %d sg_d[%d].length: %u\n", i,
+				&sg_s[i], sg_s[i].length, sg_s[i].offset,
+				j, sg_d[j].length);
+			printk(KERN_INFO "Step 2 - length: %u src_offset: %u"
+				" dst_offset: %u\n", length, src_offset,
+				dst_offset);
+#endif
+			if (length > req->rd_size)
+				length = req->rd_size;
+
+			src = sg_virt(&sg_s[i]) + src_offset;
+			if (!src)
+				BUG();
+
+			if (sg_s[i].length == length) {
+				i++;
+				src_offset = 0;
+			} else
+				src_offset = length;
+
+			dst = sg_virt(&sg_d[j++]) + dst_offset;
+			if (!dst)
+				BUG();
+
+			dst_offset = 0;
+			page_end = 1;
+		}
+
+		memcpy(dst, src, length);
+
+#ifdef DEBUG_RAMDISK_MCP
+		printk(KERN_INFO "page: %u, remaining size: %u, length: %u,"
+			" i: %u, j: %u\n", req->rd_page,
+			(req->rd_size - length), length, i, j);
+#endif
+		req->rd_size -= length;
+		if (!(req->rd_size))
+			return 0;
+
+		if (!page_end)
+			continue;
+
+		if (++req->rd_page <= table->page_end_offset) {
+#ifdef DEBUG_RAMDISK_MCP
+			printk(KERN_INFO "page: %u in same page table\n",
+				req->rd_page);
+#endif
+			continue;
+		}
+#ifdef DEBUG_RAMDISK_MCP
+		printk(KERN_INFO "getting new page table for page: %u\n",
+				req->rd_page);
+#endif
+		table = rd_get_sg_table(dev, req->rd_page);
+		if (!(table))
+			return -1;
+
+		sg_d = &table->sg_table[j = 0];
+	}
+
+	return 0;
+}
+
+/*	rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int rd_MEMCPY_do_task(struct se_task *task)
+{
+	struct se_device *dev = task->se_dev;
+	struct rd_request *req = RD_REQ(task);
+	unsigned long long lba;
+	int ret;
+
+	req->rd_page = (task->task_lba * DEV_ATTRIB(dev)->block_size) / PAGE_SIZE;
+	lba = task->task_lba;
+	req->rd_offset = (do_div(lba,
+			  (PAGE_SIZE / DEV_ATTRIB(dev)->block_size))) *
+			   DEV_ATTRIB(dev)->block_size;
+	req->rd_size = task->task_size;
+
+	if (task->task_data_direction == DMA_FROM_DEVICE)
+		ret = rd_MEMCPY_read(req);
+	else
+		ret = rd_MEMCPY_write(req);
+
+	if (ret != 0)
+		return ret;
+
+	task->task_scsi_status = GOOD;
+	transport_complete_task(task, 1);
+
+	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+/*	rd_DIRECT_with_offset():
+ *
+ *
+ */
+static int rd_DIRECT_with_offset(
+	struct se_task *task,
+	struct list_head *se_mem_list,
+	u32 *se_mem_cnt,
+	u32 *task_offset)
+{
+	struct rd_request *req = RD_REQ(task);
+	struct rd_dev *dev = req->rd_dev;
+	struct rd_dev_sg_table *table;
+	struct se_mem *se_mem;
+	struct scatterlist *sg_s;
+	u32 j = 0, set_offset = 1;
+	u32 get_next_table = 0, offset_length, table_sg_end;
+
+	table = rd_get_sg_table(dev, req->rd_page);
+	if (!(table))
+		return -1;
+
+	table_sg_end = (table->page_end_offset - req->rd_page);
+	sg_s = &table->sg_table[req->rd_page - table->page_start_offset];
+#ifdef DEBUG_RAMDISK_DR
+	printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u Page: %u, Offset: %u\n",
+		(task->task_data_direction == DMA_TO_DEVICE) ?
+			"Write" : "Read",
+		task->task_lba, req->rd_size, req->rd_page, req->rd_offset);
+#endif
+	while (req->rd_size) {
+		se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
+		if (!(se_mem)) {
+			printk(KERN_ERR "Unable to allocate struct se_mem\n");
+			return -1;
+		}
+		INIT_LIST_HEAD(&se_mem->se_list);
+
+		if (set_offset) {
+			offset_length = sg_s[j].length - req->rd_offset;
+			if (offset_length > req->rd_size)
+				offset_length = req->rd_size;
+
+			se_mem->se_page = sg_page(&sg_s[j++]);
+			se_mem->se_off = req->rd_offset;
+			se_mem->se_len = offset_length;
+
+			set_offset = 0;
+			get_next_table = (j > table_sg_end);
+			goto check_eot;
+		}
+
+		offset_length = (req->rd_size < req->rd_offset) ?
+			req->rd_size : req->rd_offset;
+
+		se_mem->se_page = sg_page(&sg_s[j]);
+		se_mem->se_len = offset_length;
+
+		set_offset = 1;
+
+check_eot:
+#ifdef DEBUG_RAMDISK_DR
+		printk(KERN_INFO "page: %u, size: %u, offset_length: %u, j: %u"
+			" se_mem: %p, se_page: %p se_off: %u se_len: %u\n",
+			req->rd_page, req->rd_size, offset_length, j, se_mem,
+			se_mem->se_page, se_mem->se_off, se_mem->se_len);
+#endif
+		list_add_tail(&se_mem->se_list, se_mem_list);
+		(*se_mem_cnt)++;
+
+		req->rd_size -= offset_length;
+		if (!(req->rd_size))
+			goto out;
+
+		if (!set_offset && !get_next_table)
+			continue;
+
+		if (++req->rd_page <= table->page_end_offset) {
+#ifdef DEBUG_RAMDISK_DR
+			printk(KERN_INFO "page: %u in same page table\n",
+					req->rd_page);
+#endif
+			continue;
+		}
+#ifdef DEBUG_RAMDISK_DR
+		printk(KERN_INFO "getting new page table for page: %u\n",
+				req->rd_page);
+#endif
+		table = rd_get_sg_table(dev, req->rd_page);
+		if (!(table))
+			return -1;
+
+		sg_s = &table->sg_table[j = 0];
+	}
+
+out:
+	T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
+#ifdef DEBUG_RAMDISK_DR
+	printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n",
+			*se_mem_cnt);
+#endif
+	return 0;
+}
+
+/*	rd_DIRECT_without_offset():
+ *
+ *
+ */
+static int rd_DIRECT_without_offset(
+	struct se_task *task,
+	struct list_head *se_mem_list,
+	u32 *se_mem_cnt,
+	u32 *task_offset)
+{
+	struct rd_request *req = RD_REQ(task);
+	struct rd_dev *dev = req->rd_dev;
+	struct rd_dev_sg_table *table;
+	struct se_mem *se_mem;
+	struct scatterlist *sg_s;
+	u32 length, j = 0;
+
+	table = rd_get_sg_table(dev, req->rd_page);
+	if (!(table))
+		return -1;
+
+	sg_s = &table->sg_table[req->rd_page - table->page_start_offset];
+#ifdef DEBUG_RAMDISK_DR
+	printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u, Page: %u\n",
+		(task->task_data_direction == DMA_TO_DEVICE) ?
+			"Write" : "Read",
+		task->task_lba, req->rd_size, req->rd_page);
+#endif
+	while (req->rd_size) {
+		se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
+		if (!(se_mem)) {
+			printk(KERN_ERR "Unable to allocate struct se_mem\n");
+			return -1;
+		}
+		INIT_LIST_HEAD(&se_mem->se_list);
+
+		length = (req->rd_size < sg_s[j].length) ?
+			req->rd_size : sg_s[j].length;
+
+		se_mem->se_page = sg_page(&sg_s[j++]);
+		se_mem->se_len = length;
+
+#ifdef DEBUG_RAMDISK_DR
+		printk(KERN_INFO "page: %u, size: %u, j: %u se_mem: %p,"
+			" se_page: %p se_off: %u se_len: %u\n", req->rd_page,
+			req->rd_size, j, se_mem, se_mem->se_page,
+			se_mem->se_off, se_mem->se_len);
+#endif
+		list_add_tail(&se_mem->se_list, se_mem_list);
+		(*se_mem_cnt)++;
+
+		req->rd_size -= length;
+		if (!(req->rd_size))
+			goto out;
+
+		if (++req->rd_page <= table->page_end_offset) {
+#ifdef DEBUG_RAMDISK_DR
+			printk("page: %u in same page table\n",
+				req->rd_page);
+#endif
+			continue;
+		}
+#ifdef DEBUG_RAMDISK_DR
+		printk(KERN_INFO "getting new page table for page: %u\n",
+				req->rd_page);
+#endif
+		table = rd_get_sg_table(dev, req->rd_page);
+		if (!(table))
+			return -1;
+
+		sg_s = &table->sg_table[j = 0];
+	}
+
+out:
+	T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
+#ifdef DEBUG_RAMDISK_DR
+	printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n",
+			*se_mem_cnt);
+#endif
+	return 0;
+}
+
+/*	rd_DIRECT_do_se_mem_map():
+ *
+ *
+ */
+static int rd_DIRECT_do_se_mem_map(
+	struct se_task *task,
+	struct list_head *se_mem_list,
+	void *in_mem,
+	struct se_mem *in_se_mem,
+	struct se_mem **out_se_mem,
+	u32 *se_mem_cnt,
+	u32 *task_offset_in)
+{
+	struct se_cmd *cmd = task->task_se_cmd;
+	struct rd_request *req = RD_REQ(task);
+	u32 task_offset = *task_offset_in;
+	unsigned long long lba;
+	int ret;
+
+	req->rd_page = ((task->task_lba * DEV_ATTRIB(task->se_dev)->block_size) /
+			PAGE_SIZE);
+	lba = task->task_lba;
+	req->rd_offset = (do_div(lba,
+			  (PAGE_SIZE / DEV_ATTRIB(task->se_dev)->block_size))) *
+			   DEV_ATTRIB(task->se_dev)->block_size;
+	req->rd_size = task->task_size;
+
+	if (req->rd_offset)
+		ret = rd_DIRECT_with_offset(task, se_mem_list, se_mem_cnt,
+				task_offset_in);
+	else
+		ret = rd_DIRECT_without_offset(task, se_mem_list, se_mem_cnt,
+				task_offset_in);
+
+	if (ret < 0)
+		return ret;
+
+	if (CMD_TFO(cmd)->task_sg_chaining == 0)
+		return 0;
+	/*
+	 * Currently prevent writers from multiple HW fabrics doing
+	 * pci_map_sg() to RD_DR's internal scatterlist memory.
+	 */
+	if (cmd->data_direction == DMA_TO_DEVICE) {
+		printk(KERN_ERR "DMA_TO_DEVICE not supported for"
+				" RAMDISK_DR with task_sg_chaining=1\n");
+		return -1;
+	}
+	/*
+	 * Special case for if task_sg_chaining is enabled, then
+	 * we setup struct se_task->task_sg[], as it will be used by
+	 * transport_do_task_sg_chain() for creating chainged SGLs
+	 * across multiple struct se_task->task_sg[].
+	 */
+	if (!(transport_calc_sg_num(task,
+			list_entry(T_TASK(cmd)->t_mem_list->next,
+				   struct se_mem, se_list),
+			task_offset)))
+		return -1;
+
+	return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
+			list_entry(T_TASK(cmd)->t_mem_list->next,
+				   struct se_mem, se_list),
+			out_se_mem, se_mem_cnt, task_offset_in);
+}
+
+/*	rd_DIRECT_do_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int rd_DIRECT_do_task(struct se_task *task)
+{
+	/*
+	 * At this point the locally allocated RD tables have been mapped
+	 * to struct se_mem elements in rd_DIRECT_do_se_mem_map().
+	 */
+	task->task_scsi_status = GOOD;
+	transport_complete_task(task, 1);
+
+	return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+/*	rd_free_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void rd_free_task(struct se_task *task)
+{
+	kfree(RD_REQ(task));
+}
+
+enum {
+	Opt_rd_pages, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_rd_pages, "rd_pages=%d"},
+	{Opt_err, NULL}
+};
+
+static ssize_t rd_set_configfs_dev_params(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	const char *page,
+	ssize_t count)
+{
+	struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
+	char *orig, *ptr, *opts;
+	substring_t args[MAX_OPT_ARGS];
+	int ret = 0, arg, token;
+
+	opts = kstrdup(page, GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	orig = opts;
+
+	while ((ptr = strsep(&opts, ",")) != NULL) {
+		if (!*ptr)
+			continue;
+
+		token = match_token(ptr, tokens, args);
+		switch (token) {
+		case Opt_rd_pages:
+			match_int(args, &arg);
+			rd_dev->rd_page_count = arg;
+			printk(KERN_INFO "RAMDISK: Referencing Page"
+				" Count: %u\n", rd_dev->rd_page_count);
+			rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT;
+			break;
+		default:
+			break;
+		}
+	}
+
+	kfree(orig);
+	return (!ret) ? count : ret;
+}
+
+static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
+{
+	struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
+
+	if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
+		printk(KERN_INFO "Missing rd_pages= parameter\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static ssize_t rd_show_configfs_dev_params(
+	struct se_hba *hba,
+	struct se_subsystem_dev *se_dev,
+	char *b)
+{
+	struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
+	ssize_t bl = sprintf(b, "TCM RamDisk ID: %u  RamDisk Makeup: %s\n",
+			rd_dev->rd_dev_id, (rd_dev->rd_direct) ?
+			"rd_direct" : "rd_mcp");
+	bl += sprintf(b + bl, "        PAGES/PAGE_SIZE: %u*%lu"
+			"  SG_table_count: %u\n", rd_dev->rd_page_count,
+			PAGE_SIZE, rd_dev->sg_table_count);
+	return bl;
+}
+
+/*	rd_get_cdb(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static unsigned char *rd_get_cdb(struct se_task *task)
+{
+	struct rd_request *req = RD_REQ(task);
+
+	return req->rd_scsi_cdb;
+}
+
+static u32 rd_get_device_rev(struct se_device *dev)
+{
+	return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
+}
+
+static u32 rd_get_device_type(struct se_device *dev)
+{
+	return TYPE_DISK;
+}
+
+static sector_t rd_get_blocks(struct se_device *dev)
+{
+	struct rd_dev *rd_dev = dev->dev_ptr;
+	unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
+			DEV_ATTRIB(dev)->block_size) - 1;
+
+	return blocks_long;
+}
+
+static struct se_subsystem_api rd_dr_template = {
+	.name			= "rd_dr",
+	.transport_type		= TRANSPORT_PLUGIN_VHBA_VDEV,
+	.attach_hba		= rd_attach_hba,
+	.detach_hba		= rd_detach_hba,
+	.allocate_virtdevice	= rd_DIRECT_allocate_virtdevice,
+	.create_virtdevice	= rd_DIRECT_create_virtdevice,
+	.free_device		= rd_free_device,
+	.alloc_task		= rd_alloc_task,
+	.do_task		= rd_DIRECT_do_task,
+	.free_task		= rd_free_task,
+	.check_configfs_dev_params = rd_check_configfs_dev_params,
+	.set_configfs_dev_params = rd_set_configfs_dev_params,
+	.show_configfs_dev_params = rd_show_configfs_dev_params,
+	.get_cdb		= rd_get_cdb,
+	.get_device_rev		= rd_get_device_rev,
+	.get_device_type	= rd_get_device_type,
+	.get_blocks		= rd_get_blocks,
+	.do_se_mem_map		= rd_DIRECT_do_se_mem_map,
+};
+
+static struct se_subsystem_api rd_mcp_template = {
+	.name			= "rd_mcp",
+	.transport_type		= TRANSPORT_PLUGIN_VHBA_VDEV,
+	.attach_hba		= rd_attach_hba,
+	.detach_hba		= rd_detach_hba,
+	.allocate_virtdevice	= rd_MEMCPY_allocate_virtdevice,
+	.create_virtdevice	= rd_MEMCPY_create_virtdevice,
+	.free_device		= rd_free_device,
+	.alloc_task		= rd_alloc_task,
+	.do_task		= rd_MEMCPY_do_task,
+	.free_task		= rd_free_task,
+	.check_configfs_dev_params = rd_check_configfs_dev_params,
+	.set_configfs_dev_params = rd_set_configfs_dev_params,
+	.show_configfs_dev_params = rd_show_configfs_dev_params,
+	.get_cdb		= rd_get_cdb,
+	.get_device_rev		= rd_get_device_rev,
+	.get_device_type	= rd_get_device_type,
+	.get_blocks		= rd_get_blocks,
+};
+
+int __init rd_module_init(void)
+{
+	int ret;
+
+	ret = transport_subsystem_register(&rd_dr_template);
+	if (ret < 0)
+		return ret;
+
+	ret = transport_subsystem_register(&rd_mcp_template);
+	if (ret < 0) {
+		transport_subsystem_release(&rd_dr_template);
+		return ret;
+	}
+
+	return 0;
+}
+
+void rd_module_exit(void)
+{
+	transport_subsystem_release(&rd_dr_template);
+	transport_subsystem_release(&rd_mcp_template);
+}
diff --git a/drivers/target/target_core_rd.h b/drivers/target/target_core_rd.h
new file mode 100644
index 0000000..13badfb
--- /dev/null
+++ b/drivers/target/target_core_rd.h
@@ -0,0 +1,73 @@
+#ifndef TARGET_CORE_RD_H
+#define TARGET_CORE_RD_H
+
+#define RD_HBA_VERSION		"v4.0"
+#define RD_DR_VERSION		"4.0"
+#define RD_MCP_VERSION		"4.0"
+
+/* Largest piece of memory kmalloc can allocate */
+#define RD_MAX_ALLOCATION_SIZE	65536
+/* Maximum queuedepth for the Ramdisk HBA */
+#define RD_HBA_QUEUE_DEPTH	256
+#define RD_DEVICE_QUEUE_DEPTH	32
+#define RD_MAX_DEVICE_QUEUE_DEPTH 128
+#define RD_BLOCKSIZE		512
+#define RD_MAX_SECTORS		1024
+
+extern struct kmem_cache *se_mem_cache;
+
+/* Used in target_core_init_configfs() for virtual LUN 0 access */
+int __init rd_module_init(void);
+void rd_module_exit(void);
+
+#define RRF_EMULATE_CDB		0x01
+#define RRF_GOT_LBA		0x02
+
+struct rd_request {
+	struct se_task	rd_task;
+
+	/* SCSI CDB from iSCSI Command PDU */
+	unsigned char	rd_scsi_cdb[TCM_MAX_COMMAND_SIZE];
+	/* Offset from start of page */
+	u32		rd_offset;
+	/* Starting page in Ramdisk for request */
+	u32		rd_page;
+	/* Total number of pages needed for request */
+	u32		rd_page_count;
+	/* Scatterlist count */
+	u32		rd_size;
+	/* Ramdisk device */
+	struct rd_dev	*rd_dev;
+} ____cacheline_aligned;
+
+struct rd_dev_sg_table {
+	u32		page_start_offset;
+	u32		page_end_offset;
+	u32		rd_sg_count;
+	struct scatterlist *sg_table;
+} ____cacheline_aligned;
+
+#define RDF_HAS_PAGE_COUNT	0x01
+
+struct rd_dev {
+	int		rd_direct;
+	u32		rd_flags;
+	/* Unique Ramdisk Device ID in Ramdisk HBA */
+	u32		rd_dev_id;
+	/* Total page count for ramdisk device */
+	u32		rd_page_count;
+	/* Number of SG tables in sg_table_array */
+	u32		sg_table_count;
+	u32		rd_queue_depth;
+	/* Array of rd_dev_sg_table_t containing scatterlists */
+	struct rd_dev_sg_table *sg_table_array;
+	/* Ramdisk HBA device is connected to */
+	struct rd_host *rd_host;
+} ____cacheline_aligned;
+
+struct rd_host {
+	u32		rd_host_dev_id_count;
+	u32		rd_host_id;		/* Unique Ramdisk Host ID */
+} ____cacheline_aligned;
+
+#endif /* TARGET_CORE_RD_H */
diff --git a/drivers/target/target_core_scdb.c b/drivers/target/target_core_scdb.c
new file mode 100644
index 0000000..dc6fed0
--- /dev/null
+++ b/drivers/target/target_core_scdb.c
@@ -0,0 +1,105 @@
+/*******************************************************************************
+ * Filename:  target_core_scdb.c
+ *
+ * This file contains the generic target engine Split CDB related functions.
+ *
+ * Copyright (c) 2004-2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <scsi/scsi.h>
+#include <asm/unaligned.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_scdb.h"
+
+/*	split_cdb_XX_6():
+ *
+ *      21-bit LBA w/ 8-bit SECTORS
+ */
+void split_cdb_XX_6(
+	unsigned long long lba,
+	u32 *sectors,
+	unsigned char *cdb)
+{
+	cdb[1] = (lba >> 16) & 0x1f;
+	cdb[2] = (lba >> 8) & 0xff;
+	cdb[3] = lba & 0xff;
+	cdb[4] = *sectors & 0xff;
+}
+
+/*	split_cdb_XX_10():
+ *
+ *	32-bit LBA w/ 16-bit SECTORS
+ */
+void split_cdb_XX_10(
+	unsigned long long lba,
+	u32 *sectors,
+	unsigned char *cdb)
+{
+	put_unaligned_be32(lba, &cdb[2]);
+	put_unaligned_be16(*sectors, &cdb[7]);
+}
+
+/*	split_cdb_XX_12():
+ *
+ *	32-bit LBA w/ 32-bit SECTORS
+ */
+void split_cdb_XX_12(
+	unsigned long long lba,
+	u32 *sectors,
+	unsigned char *cdb)
+{
+	put_unaligned_be32(lba, &cdb[2]);
+	put_unaligned_be32(*sectors, &cdb[6]);
+}
+
+/*	split_cdb_XX_16():
+ *
+ *	64-bit LBA w/ 32-bit SECTORS
+ */
+void split_cdb_XX_16(
+	unsigned long long lba,
+	u32 *sectors,
+	unsigned char *cdb)
+{
+	put_unaligned_be64(lba, &cdb[2]);
+	put_unaligned_be32(*sectors, &cdb[10]);
+}
+
+/*
+ *	split_cdb_XX_32():
+ *
+ * 	64-bit LBA w/ 32-bit SECTORS such as READ_32, WRITE_32 and emulated XDWRITEREAD_32
+ */
+void split_cdb_XX_32(
+	unsigned long long lba,
+	u32 *sectors,
+	unsigned char *cdb)
+{
+	put_unaligned_be64(lba, &cdb[12]);
+	put_unaligned_be32(*sectors, &cdb[28]);
+}
diff --git a/drivers/target/target_core_scdb.h b/drivers/target/target_core_scdb.h
new file mode 100644
index 0000000..98cd1c0
--- /dev/null
+++ b/drivers/target/target_core_scdb.h
@@ -0,0 +1,10 @@
+#ifndef TARGET_CORE_SCDB_H
+#define TARGET_CORE_SCDB_H
+
+extern void split_cdb_XX_6(unsigned long long, u32 *, unsigned char *);
+extern void split_cdb_XX_10(unsigned long long, u32 *, unsigned char *);
+extern void split_cdb_XX_12(unsigned long long, u32 *, unsigned char *);
+extern void split_cdb_XX_16(unsigned long long, u32 *, unsigned char *);
+extern void split_cdb_XX_32(unsigned long long, u32 *, unsigned char *);
+
+#endif /* TARGET_CORE_SCDB_H */
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
new file mode 100644
index 0000000..158cecb
--- /dev/null
+++ b/drivers/target/target_core_tmr.c
@@ -0,0 +1,404 @@
+/*******************************************************************************
+ * Filename:  target_core_tmr.c
+ *
+ * This file contains SPC-3 task management infrastructure
+ *
+ * Copyright (c) 2009,2010 Rising Tide Systems
+ * Copyright (c) 2009,2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tmr.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_alua.h"
+#include "target_core_pr.h"
+
+#define DEBUG_LUN_RESET
+#ifdef DEBUG_LUN_RESET
+#define DEBUG_LR(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_LR(x...)
+#endif
+
+struct se_tmr_req *core_tmr_alloc_req(
+	struct se_cmd *se_cmd,
+	void *fabric_tmr_ptr,
+	u8 function)
+{
+	struct se_tmr_req *tmr;
+
+	tmr = kmem_cache_zalloc(se_tmr_req_cache, GFP_KERNEL);
+	if (!(tmr)) {
+		printk(KERN_ERR "Unable to allocate struct se_tmr_req\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	tmr->task_cmd = se_cmd;
+	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
+	tmr->function = function;
+	INIT_LIST_HEAD(&tmr->tmr_list);
+
+	return tmr;
+}
+EXPORT_SYMBOL(core_tmr_alloc_req);
+
+void core_tmr_release_req(
+	struct se_tmr_req *tmr)
+{
+	struct se_device *dev = tmr->tmr_dev;
+
+	spin_lock(&dev->se_tmr_lock);
+	list_del(&tmr->tmr_list);
+	kmem_cache_free(se_tmr_req_cache, tmr);
+	spin_unlock(&dev->se_tmr_lock);
+}
+
+static void core_tmr_handle_tas_abort(
+	struct se_node_acl *tmr_nacl,
+	struct se_cmd *cmd,
+	int tas,
+	int fe_count)
+{
+	if (!(fe_count)) {
+		transport_cmd_finish_abort(cmd, 1);
+		return;
+	}
+	/*
+	 * TASK ABORTED status (TAS) bit support
+	*/
+	if (((tmr_nacl != NULL) &&
+	     (tmr_nacl == cmd->se_sess->se_node_acl)) || tas)
+		transport_send_task_abort(cmd);
+
+	transport_cmd_finish_abort(cmd, 0);
+}
+
+int core_tmr_lun_reset(
+	struct se_device *dev,
+	struct se_tmr_req *tmr,
+	struct list_head *preempt_and_abort_list,
+	struct se_cmd *prout_cmd)
+{
+	struct se_cmd *cmd;
+	struct se_queue_req *qr, *qr_tmp;
+	struct se_node_acl *tmr_nacl = NULL;
+	struct se_portal_group *tmr_tpg = NULL;
+	struct se_queue_obj *qobj = dev->dev_queue_obj;
+	struct se_tmr_req *tmr_p, *tmr_pp;
+	struct se_task *task, *task_tmp;
+	unsigned long flags;
+	int fe_count, state, tas;
+	/*
+	 * TASK_ABORTED status bit, this is configurable via ConfigFS
+	 * struct se_device attributes.  spc4r17 section 7.4.6 Control mode page
+	 *
+	 * A task aborted status (TAS) bit set to zero specifies that aborted
+	 * tasks shall be terminated by the device server without any response
+	 * to the application client. A TAS bit set to one specifies that tasks
+	 * aborted by the actions of an I_T nexus other than the I_T nexus on
+	 * which the command was received shall be completed with TASK ABORTED
+	 * status (see SAM-4).
+	 */
+	tas = DEV_ATTRIB(dev)->emulate_tas;
+	/*
+	 * Determine if this se_tmr is coming from a $FABRIC_MOD
+	 * or struct se_device passthrough..
+	 */
+	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
+		tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
+		tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
+		if (tmr_nacl && tmr_tpg) {
+			DEBUG_LR("LUN_RESET: TMR caller fabric: %s"
+				" initiator port %s\n",
+				TPG_TFO(tmr_tpg)->get_fabric_name(),
+				tmr_nacl->initiatorname);
+		}
+	}
+	DEBUG_LR("LUN_RESET: %s starting for [%s], tas: %d\n",
+		(preempt_and_abort_list) ? "Preempt" : "TMR",
+		TRANSPORT(dev)->name, tas);
+	/*
+	 * Release all pending and outgoing TMRs aside from the received
+	 * LUN_RESET tmr..
+	 */
+	spin_lock(&dev->se_tmr_lock);
+	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
+		/*
+		 * Allow the received TMR to return with FUNCTION_COMPLETE.
+		 */
+		if (tmr && (tmr_p == tmr))
+			continue;
+
+		cmd = tmr_p->task_cmd;
+		if (!(cmd)) {
+			printk(KERN_ERR "Unable to locate struct se_cmd for TMR\n");
+			continue;
+		}
+		/*
+		 * If this function was called with a valid pr_res_key
+		 * parameter (eg: for PROUT PREEMPT_AND_ABORT service action
+		 * skip non regisration key matching TMRs.
+		 */
+		if ((preempt_and_abort_list != NULL) &&
+		    (core_scsi3_check_cdb_abort_and_preempt(
+					preempt_and_abort_list, cmd) != 0))
+			continue;
+		spin_unlock(&dev->se_tmr_lock);
+
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+		if (!(atomic_read(&T_TASK(cmd)->t_transport_active))) {
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+			spin_lock(&dev->se_tmr_lock);
+			continue;
+		}
+		if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+			spin_lock(&dev->se_tmr_lock);
+			continue;
+		}
+		DEBUG_LR("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
+			" Response: 0x%02x, t_state: %d\n",
+			(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
+			tmr_p->function, tmr_p->response, cmd->t_state);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+		transport_cmd_finish_abort_tmr(cmd);
+		spin_lock(&dev->se_tmr_lock);
+	}
+	spin_unlock(&dev->se_tmr_lock);
+	/*
+	 * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
+	 * This is following sam4r17, section 5.6 Aborting commands, Table 38
+	 * for TMR LUN_RESET:
+	 *
+	 * a) "Yes" indicates that each command that is aborted on an I_T nexus
+	 * other than the one that caused the SCSI device condition is
+	 * completed with TASK ABORTED status, if the TAS bit is set to one in
+	 * the Control mode page (see SPC-4). "No" indicates that no status is
+	 * returned for aborted commands.
+	 *
+	 * d) If the logical unit reset is caused by a particular I_T nexus
+	 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
+	 * (TASK_ABORTED status) applies.
+	 *
+	 * Otherwise (e.g., if triggered by a hard reset), "no"
+	 * (no TASK_ABORTED SAM status) applies.
+	 *
+	 * Note that this seems to be independent of TAS (Task Aborted Status)
+	 * in the Control Mode Page.
+	 */
+	spin_lock_irqsave(&dev->execute_task_lock, flags);
+	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
+				t_state_list) {
+		if (!(TASK_CMD(task))) {
+			printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
+			continue;
+		}
+		cmd = TASK_CMD(task);
+
+		if (!T_TASK(cmd)) {
+			printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
+				" %p ITT: 0x%08x\n", task, cmd,
+				CMD_TFO(cmd)->get_task_tag(cmd));
+			continue;
+		}
+		/*
+		 * For PREEMPT_AND_ABORT usage, only process commands
+		 * with a matching reservation key.
+		 */
+		if ((preempt_and_abort_list != NULL) &&
+		    (core_scsi3_check_cdb_abort_and_preempt(
+					preempt_and_abort_list, cmd) != 0))
+			continue;
+		/*
+		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
+		 */
+		if (prout_cmd == cmd)
+			continue;
+
+		list_del(&task->t_state_list);
+		atomic_set(&task->task_state_active, 0);
+		spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+		DEBUG_LR("LUN_RESET: %s cmd: %p task: %p"
+			" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
+			"def_t_state: %d/%d cdb: 0x%02x\n",
+			(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
+			CMD_TFO(cmd)->get_task_tag(cmd), 0,
+			CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
+			cmd->deferred_t_state, T_TASK(cmd)->t_task_cdb[0]);
+		DEBUG_LR("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
+			" t_task_cdbs: %d t_task_cdbs_left: %d"
+			" t_task_cdbs_sent: %d -- t_transport_active: %d"
+			" t_transport_stop: %d t_transport_sent: %d\n",
+			CMD_TFO(cmd)->get_task_tag(cmd), cmd->pr_res_key,
+			T_TASK(cmd)->t_task_cdbs,
+			atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
+			atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
+			atomic_read(&T_TASK(cmd)->t_transport_active),
+			atomic_read(&T_TASK(cmd)->t_transport_stop),
+			atomic_read(&T_TASK(cmd)->t_transport_sent));
+
+		if (atomic_read(&task->task_active)) {
+			atomic_set(&task->task_stop, 1);
+			spin_unlock_irqrestore(
+				&T_TASK(cmd)->t_state_lock, flags);
+
+			DEBUG_LR("LUN_RESET: Waiting for task: %p to shutdown"
+				" for dev: %p\n", task, dev);
+			wait_for_completion(&task->task_stop_comp);
+			DEBUG_LR("LUN_RESET Completed task: %p shutdown for"
+				" dev: %p\n", task, dev);
+			spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+			atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
+
+			atomic_set(&task->task_active, 0);
+			atomic_set(&task->task_stop, 0);
+		}
+		__transport_stop_task_timer(task, &flags);
+
+		if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) {
+			spin_unlock_irqrestore(
+					&T_TASK(cmd)->t_state_lock, flags);
+			DEBUG_LR("LUN_RESET: Skipping task: %p, dev: %p for"
+				" t_task_cdbs_ex_left: %d\n", task, dev,
+				atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left));
+
+			spin_lock_irqsave(&dev->execute_task_lock, flags);
+			continue;
+		}
+		fe_count = atomic_read(&T_TASK(cmd)->t_fe_count);
+
+		if (atomic_read(&T_TASK(cmd)->t_transport_active)) {
+			DEBUG_LR("LUN_RESET: got t_transport_active = 1 for"
+				" task: %p, t_fe_count: %d dev: %p\n", task,
+				fe_count, dev);
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+						flags);
+			core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
+
+			spin_lock_irqsave(&dev->execute_task_lock, flags);
+			continue;
+		}
+		DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p,"
+			" t_fe_count: %d dev: %p\n", task, fe_count, dev);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
+
+		spin_lock_irqsave(&dev->execute_task_lock, flags);
+	}
+	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+	/*
+	 * Release all commands remaining in the struct se_device cmd queue.
+	 *
+	 * This follows the same logic as above for the struct se_device
+	 * struct se_task state list, where commands are returned with
+	 * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
+	 * reference, otherwise the struct se_cmd is released.
+	 */
+	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+	list_for_each_entry_safe(qr, qr_tmp, &qobj->qobj_list, qr_list) {
+		cmd = (struct se_cmd *)qr->cmd;
+		if (!(cmd)) {
+			/*
+			 * Skip these for non PREEMPT_AND_ABORT usage..
+			 */
+			if (preempt_and_abort_list != NULL)
+				continue;
+
+			atomic_dec(&qobj->queue_cnt);
+			list_del(&qr->qr_list);
+			kfree(qr);
+			continue;
+		}
+		/*
+		 * For PREEMPT_AND_ABORT usage, only process commands
+		 * with a matching reservation key.
+		 */
+		if ((preempt_and_abort_list != NULL) &&
+		    (core_scsi3_check_cdb_abort_and_preempt(
+					preempt_and_abort_list, cmd) != 0))
+			continue;
+		/*
+		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
+		 */
+		if (prout_cmd == cmd)
+			continue;
+
+		atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
+		atomic_dec(&qobj->queue_cnt);
+		list_del(&qr->qr_list);
+		spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+		state = qr->state;
+		kfree(qr);
+
+		DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
+			" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
+			"Preempt" : "", cmd, state,
+			atomic_read(&T_TASK(cmd)->t_fe_count));
+		/*
+		 * Signal that the command has failed via cmd->se_cmd_flags,
+		 * and call TFO->new_cmd_failure() to wakeup any fabric
+		 * dependent code used to wait for unsolicited data out
+		 * allocation to complete.  The fabric module is expected
+		 * to dump any remaining unsolicited data out for the aborted
+		 * command at this point.
+		 */
+		transport_new_cmd_failure(cmd);
+
+		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
+				atomic_read(&T_TASK(cmd)->t_fe_count));
+		spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+	}
+	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+	/*
+	 * Clear any legacy SPC-2 reservation when called during
+	 * LOGICAL UNIT RESET
+	 */
+	if (!(preempt_and_abort_list) &&
+	     (dev->dev_flags & DF_SPC2_RESERVATIONS)) {
+		spin_lock(&dev->dev_reservation_lock);
+		dev->dev_reserved_node_acl = NULL;
+		dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
+		spin_unlock(&dev->dev_reservation_lock);
+		printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n");
+	}
+
+	spin_lock(&dev->stats_lock);
+	dev->num_resets++;
+	spin_unlock(&dev->stats_lock);
+
+	DEBUG_LR("LUN_RESET: %s for [%s] Complete\n",
+			(preempt_and_abort_list) ? "Preempt" : "TMR",
+			TRANSPORT(dev)->name);
+	return 0;
+}
diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
new file mode 100644
index 0000000..abfa81a
--- /dev/null
+++ b/drivers/target/target_core_tpg.c
@@ -0,0 +1,826 @@
+/*******************************************************************************
+ * Filename:  target_core_tpg.c
+ *
+ * This file contains generic Target Portal Group related functions.
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/in.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+
+#include "target_core_hba.h"
+
+/*	core_clear_initiator_node_from_tpg():
+ *
+ *
+ */
+static void core_clear_initiator_node_from_tpg(
+	struct se_node_acl *nacl,
+	struct se_portal_group *tpg)
+{
+	int i;
+	struct se_dev_entry *deve;
+	struct se_lun *lun;
+	struct se_lun_acl *acl, *acl_tmp;
+
+	spin_lock_irq(&nacl->device_list_lock);
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		deve = &nacl->device_list[i];
+
+		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
+			continue;
+
+		if (!deve->se_lun) {
+			printk(KERN_ERR "%s device entries device pointer is"
+				" NULL, but Initiator has access.\n",
+				TPG_TFO(tpg)->get_fabric_name());
+			continue;
+		}
+
+		lun = deve->se_lun;
+		spin_unlock_irq(&nacl->device_list_lock);
+		core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
+			TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
+
+		spin_lock(&lun->lun_acl_lock);
+		list_for_each_entry_safe(acl, acl_tmp,
+					&lun->lun_acl_list, lacl_list) {
+			if (!(strcmp(acl->initiatorname,
+					nacl->initiatorname)) &&
+			     (acl->mapped_lun == deve->mapped_lun))
+				break;
+		}
+
+		if (!acl) {
+			printk(KERN_ERR "Unable to locate struct se_lun_acl for %s,"
+				" mapped_lun: %u\n", nacl->initiatorname,
+				deve->mapped_lun);
+			spin_unlock(&lun->lun_acl_lock);
+			spin_lock_irq(&nacl->device_list_lock);
+			continue;
+		}
+
+		list_del(&acl->lacl_list);
+		spin_unlock(&lun->lun_acl_lock);
+
+		spin_lock_irq(&nacl->device_list_lock);
+		kfree(acl);
+	}
+	spin_unlock_irq(&nacl->device_list_lock);
+}
+
+/*	__core_tpg_get_initiator_node_acl():
+ *
+ *	spin_lock_bh(&tpg->acl_node_lock); must be held when calling
+ */
+struct se_node_acl *__core_tpg_get_initiator_node_acl(
+	struct se_portal_group *tpg,
+	const char *initiatorname)
+{
+	struct se_node_acl *acl;
+
+	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
+		if (!(strcmp(acl->initiatorname, initiatorname)))
+			return acl;
+	}
+
+	return NULL;
+}
+
+/*	core_tpg_get_initiator_node_acl():
+ *
+ *
+ */
+struct se_node_acl *core_tpg_get_initiator_node_acl(
+	struct se_portal_group *tpg,
+	unsigned char *initiatorname)
+{
+	struct se_node_acl *acl;
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
+		if (!(strcmp(acl->initiatorname, initiatorname)) &&
+		   (!(acl->dynamic_node_acl))) {
+			spin_unlock_bh(&tpg->acl_node_lock);
+			return acl;
+		}
+	}
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	return NULL;
+}
+
+/*	core_tpg_add_node_to_devs():
+ *
+ *
+ */
+void core_tpg_add_node_to_devs(
+	struct se_node_acl *acl,
+	struct se_portal_group *tpg)
+{
+	int i = 0;
+	u32 lun_access = 0;
+	struct se_lun *lun;
+	struct se_device *dev;
+
+	spin_lock(&tpg->tpg_lun_lock);
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		lun = &tpg->tpg_lun_list[i];
+		if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
+			continue;
+
+		spin_unlock(&tpg->tpg_lun_lock);
+
+		dev = lun->lun_se_dev;
+		/*
+		 * By default in LIO-Target $FABRIC_MOD,
+		 * demo_mode_write_protect is ON, or READ_ONLY;
+		 */
+		if (!(TPG_TFO(tpg)->tpg_check_demo_mode_write_protect(tpg))) {
+			if (dev->dev_flags & DF_READ_ONLY)
+				lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
+			else
+				lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
+		} else {
+			/*
+			 * Allow only optical drives to issue R/W in default RO
+			 * demo mode.
+			 */
+			if (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK)
+				lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
+			else
+				lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
+		}
+
+		printk(KERN_INFO "TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
+			" access for LUN in Demo Mode\n",
+			TPG_TFO(tpg)->get_fabric_name(),
+			TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
+			(lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
+			"READ-WRITE" : "READ-ONLY");
+
+		core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
+				lun_access, acl, tpg, 1);
+		spin_lock(&tpg->tpg_lun_lock);
+	}
+	spin_unlock(&tpg->tpg_lun_lock);
+}
+
+/*      core_set_queue_depth_for_node():
+ *
+ *
+ */
+static int core_set_queue_depth_for_node(
+	struct se_portal_group *tpg,
+	struct se_node_acl *acl)
+{
+	if (!acl->queue_depth) {
+		printk(KERN_ERR "Queue depth for %s Initiator Node: %s is 0,"
+			"defaulting to 1.\n", TPG_TFO(tpg)->get_fabric_name(),
+			acl->initiatorname);
+		acl->queue_depth = 1;
+	}
+
+	return 0;
+}
+
+/*      core_create_device_list_for_node():
+ *
+ *
+ */
+static int core_create_device_list_for_node(struct se_node_acl *nacl)
+{
+	struct se_dev_entry *deve;
+	int i;
+
+	nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
+				TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
+	if (!(nacl->device_list)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+			" struct se_node_acl->device_list\n");
+		return -1;
+	}
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		deve = &nacl->device_list[i];
+
+		atomic_set(&deve->ua_count, 0);
+		atomic_set(&deve->pr_ref_count, 0);
+		spin_lock_init(&deve->ua_lock);
+		INIT_LIST_HEAD(&deve->alua_port_list);
+		INIT_LIST_HEAD(&deve->ua_list);
+	}
+
+	return 0;
+}
+
+/*	core_tpg_check_initiator_node_acl()
+ *
+ *
+ */
+struct se_node_acl *core_tpg_check_initiator_node_acl(
+	struct se_portal_group *tpg,
+	unsigned char *initiatorname)
+{
+	struct se_node_acl *acl;
+
+	acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if ((acl))
+		return acl;
+
+	if (!(TPG_TFO(tpg)->tpg_check_demo_mode(tpg)))
+		return NULL;
+
+	acl =  TPG_TFO(tpg)->tpg_alloc_fabric_acl(tpg);
+	if (!(acl))
+		return NULL;
+
+	INIT_LIST_HEAD(&acl->acl_list);
+	INIT_LIST_HEAD(&acl->acl_sess_list);
+	spin_lock_init(&acl->device_list_lock);
+	spin_lock_init(&acl->nacl_sess_lock);
+	atomic_set(&acl->acl_pr_ref_count, 0);
+	atomic_set(&acl->mib_ref_count, 0);
+	acl->queue_depth = TPG_TFO(tpg)->tpg_get_default_depth(tpg);
+	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
+	acl->se_tpg = tpg;
+	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
+	spin_lock_init(&acl->stats_lock);
+	acl->dynamic_node_acl = 1;
+
+	TPG_TFO(tpg)->set_default_node_attributes(acl);
+
+	if (core_create_device_list_for_node(acl) < 0) {
+		TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
+		return NULL;
+	}
+
+	if (core_set_queue_depth_for_node(tpg, acl) < 0) {
+		core_free_device_list_for_node(acl, tpg);
+		TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
+		return NULL;
+	}
+
+	core_tpg_add_node_to_devs(acl, tpg);
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	list_add_tail(&acl->acl_list, &tpg->acl_node_list);
+	tpg->num_node_acls++;
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	printk("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
+		" Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
+		TPG_TFO(tpg)->get_fabric_name(), initiatorname);
+
+	return acl;
+}
+EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
+
+void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
+{
+	while (atomic_read(&nacl->acl_pr_ref_count) != 0)
+		cpu_relax();
+}
+
+void core_tpg_wait_for_mib_ref(struct se_node_acl *nacl)
+{
+	while (atomic_read(&nacl->mib_ref_count) != 0)
+		cpu_relax();
+}
+
+void core_tpg_clear_object_luns(struct se_portal_group *tpg)
+{
+	int i, ret;
+	struct se_lun *lun;
+
+	spin_lock(&tpg->tpg_lun_lock);
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		lun = &tpg->tpg_lun_list[i];
+
+		if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
+		    (lun->lun_se_dev == NULL))
+			continue;
+
+		spin_unlock(&tpg->tpg_lun_lock);
+		ret = core_dev_del_lun(tpg, lun->unpacked_lun);
+		spin_lock(&tpg->tpg_lun_lock);
+	}
+	spin_unlock(&tpg->tpg_lun_lock);
+}
+EXPORT_SYMBOL(core_tpg_clear_object_luns);
+
+/*	core_tpg_add_initiator_node_acl():
+ *
+ *
+ */
+struct se_node_acl *core_tpg_add_initiator_node_acl(
+	struct se_portal_group *tpg,
+	struct se_node_acl *se_nacl,
+	const char *initiatorname,
+	u32 queue_depth)
+{
+	struct se_node_acl *acl = NULL;
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if ((acl)) {
+		if (acl->dynamic_node_acl) {
+			acl->dynamic_node_acl = 0;
+			printk(KERN_INFO "%s_TPG[%u] - Replacing dynamic ACL"
+				" for %s\n", TPG_TFO(tpg)->get_fabric_name(),
+				TPG_TFO(tpg)->tpg_get_tag(tpg), initiatorname);
+			spin_unlock_bh(&tpg->acl_node_lock);
+			/*
+			 * Release the locally allocated struct se_node_acl
+			 * because * core_tpg_add_initiator_node_acl() returned
+			 * a pointer to an existing demo mode node ACL.
+			 */
+			if (se_nacl)
+				TPG_TFO(tpg)->tpg_release_fabric_acl(tpg,
+							se_nacl);
+			goto done;
+		}
+
+		printk(KERN_ERR "ACL entry for %s Initiator"
+			" Node %s already exists for TPG %u, ignoring"
+			" request.\n",  TPG_TFO(tpg)->get_fabric_name(),
+			initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock_bh(&tpg->acl_node_lock);
+		return ERR_PTR(-EEXIST);
+	}
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	if (!(se_nacl)) {
+		printk("struct se_node_acl pointer is NULL\n");
+		return ERR_PTR(-EINVAL);
+	}
+	/*
+	 * For v4.x logic the se_node_acl_s is hanging off a fabric
+	 * dependent structure allocated via
+	 * struct target_core_fabric_ops->fabric_make_nodeacl()
+	 */
+	acl = se_nacl;
+
+	INIT_LIST_HEAD(&acl->acl_list);
+	INIT_LIST_HEAD(&acl->acl_sess_list);
+	spin_lock_init(&acl->device_list_lock);
+	spin_lock_init(&acl->nacl_sess_lock);
+	atomic_set(&acl->acl_pr_ref_count, 0);
+	acl->queue_depth = queue_depth;
+	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
+	acl->se_tpg = tpg;
+	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
+	spin_lock_init(&acl->stats_lock);
+
+	TPG_TFO(tpg)->set_default_node_attributes(acl);
+
+	if (core_create_device_list_for_node(acl) < 0) {
+		TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	if (core_set_queue_depth_for_node(tpg, acl) < 0) {
+		core_free_device_list_for_node(acl, tpg);
+		TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
+		return ERR_PTR(-EINVAL);
+	}
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	list_add_tail(&acl->acl_list, &tpg->acl_node_list);
+	tpg->num_node_acls++;
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+done:
+	printk(KERN_INFO "%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
+		" Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
+		TPG_TFO(tpg)->get_fabric_name(), initiatorname);
+
+	return acl;
+}
+EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
+
+/*	core_tpg_del_initiator_node_acl():
+ *
+ *
+ */
+int core_tpg_del_initiator_node_acl(
+	struct se_portal_group *tpg,
+	struct se_node_acl *acl,
+	int force)
+{
+	struct se_session *sess, *sess_tmp;
+	int dynamic_acl = 0;
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	if (acl->dynamic_node_acl) {
+		acl->dynamic_node_acl = 0;
+		dynamic_acl = 1;
+	}
+	list_del(&acl->acl_list);
+	tpg->num_node_acls--;
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	spin_lock_bh(&tpg->session_lock);
+	list_for_each_entry_safe(sess, sess_tmp,
+				&tpg->tpg_sess_list, sess_list) {
+		if (sess->se_node_acl != acl)
+			continue;
+		/*
+		 * Determine if the session needs to be closed by our context.
+		 */
+		if (!(TPG_TFO(tpg)->shutdown_session(sess)))
+			continue;
+
+		spin_unlock_bh(&tpg->session_lock);
+		/*
+		 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
+		 * forcefully shutdown the $FABRIC_MOD session/nexus.
+		 */
+		TPG_TFO(tpg)->close_session(sess);
+
+		spin_lock_bh(&tpg->session_lock);
+	}
+	spin_unlock_bh(&tpg->session_lock);
+
+	core_tpg_wait_for_nacl_pr_ref(acl);
+	core_tpg_wait_for_mib_ref(acl);
+	core_clear_initiator_node_from_tpg(acl, tpg);
+	core_free_device_list_for_node(acl, tpg);
+
+	printk(KERN_INFO "%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
+		" Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
+		TPG_TFO(tpg)->get_fabric_name(), acl->initiatorname);
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
+
+/*	core_tpg_set_initiator_node_queue_depth():
+ *
+ *
+ */
+int core_tpg_set_initiator_node_queue_depth(
+	struct se_portal_group *tpg,
+	unsigned char *initiatorname,
+	u32 queue_depth,
+	int force)
+{
+	struct se_session *sess, *init_sess = NULL;
+	struct se_node_acl *acl;
+	int dynamic_acl = 0;
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if (!(acl)) {
+		printk(KERN_ERR "Access Control List entry for %s Initiator"
+			" Node %s does not exists for TPG %hu, ignoring"
+			" request.\n", TPG_TFO(tpg)->get_fabric_name(),
+			initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock_bh(&tpg->acl_node_lock);
+		return -ENODEV;
+	}
+	if (acl->dynamic_node_acl) {
+		acl->dynamic_node_acl = 0;
+		dynamic_acl = 1;
+	}
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	spin_lock_bh(&tpg->session_lock);
+	list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
+		if (sess->se_node_acl != acl)
+			continue;
+
+		if (!force) {
+			printk(KERN_ERR "Unable to change queue depth for %s"
+				" Initiator Node: %s while session is"
+				" operational.  To forcefully change the queue"
+				" depth and force session reinstatement"
+				" use the \"force=1\" parameter.\n",
+				TPG_TFO(tpg)->get_fabric_name(), initiatorname);
+			spin_unlock_bh(&tpg->session_lock);
+
+			spin_lock_bh(&tpg->acl_node_lock);
+			if (dynamic_acl)
+				acl->dynamic_node_acl = 1;
+			spin_unlock_bh(&tpg->acl_node_lock);
+			return -EEXIST;
+		}
+		/*
+		 * Determine if the session needs to be closed by our context.
+		 */
+		if (!(TPG_TFO(tpg)->shutdown_session(sess)))
+			continue;
+
+		init_sess = sess;
+		break;
+	}
+
+	/*
+	 * User has requested to change the queue depth for a Initiator Node.
+	 * Change the value in the Node's struct se_node_acl, and call
+	 * core_set_queue_depth_for_node() to add the requested queue depth.
+	 *
+	 * Finally call  TPG_TFO(tpg)->close_session() to force session
+	 * reinstatement to occur if there is an active session for the
+	 * $FABRIC_MOD Initiator Node in question.
+	 */
+	acl->queue_depth = queue_depth;
+
+	if (core_set_queue_depth_for_node(tpg, acl) < 0) {
+		spin_unlock_bh(&tpg->session_lock);
+		/*
+		 * Force session reinstatement if
+		 * core_set_queue_depth_for_node() failed, because we assume
+		 * the $FABRIC_MOD has already the set session reinstatement
+		 * bit from TPG_TFO(tpg)->shutdown_session() called above.
+		 */
+		if (init_sess)
+			TPG_TFO(tpg)->close_session(init_sess);
+
+		spin_lock_bh(&tpg->acl_node_lock);
+		if (dynamic_acl)
+			acl->dynamic_node_acl = 1;
+		spin_unlock_bh(&tpg->acl_node_lock);
+		return -EINVAL;
+	}
+	spin_unlock_bh(&tpg->session_lock);
+	/*
+	 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
+	 * forcefully shutdown the $FABRIC_MOD session/nexus.
+	 */
+	if (init_sess)
+		TPG_TFO(tpg)->close_session(init_sess);
+
+	printk(KERN_INFO "Successfuly changed queue depth to: %d for Initiator"
+		" Node: %s on %s Target Portal Group: %u\n", queue_depth,
+		initiatorname, TPG_TFO(tpg)->get_fabric_name(),
+		TPG_TFO(tpg)->tpg_get_tag(tpg));
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	if (dynamic_acl)
+		acl->dynamic_node_acl = 1;
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
+
+static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
+{
+	/* Set in core_dev_setup_virtual_lun0() */
+	struct se_device *dev = se_global->g_lun0_dev;
+	struct se_lun *lun = &se_tpg->tpg_virt_lun0;
+	u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
+	int ret;
+
+	lun->unpacked_lun = 0;
+	lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
+	atomic_set(&lun->lun_acl_count, 0);
+	init_completion(&lun->lun_shutdown_comp);
+	INIT_LIST_HEAD(&lun->lun_acl_list);
+	INIT_LIST_HEAD(&lun->lun_cmd_list);
+	spin_lock_init(&lun->lun_acl_lock);
+	spin_lock_init(&lun->lun_cmd_lock);
+	spin_lock_init(&lun->lun_sep_lock);
+
+	ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
+	if (ret < 0)
+		return -1;
+
+	return 0;
+}
+
+static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
+{
+	struct se_lun *lun = &se_tpg->tpg_virt_lun0;
+
+	core_tpg_post_dellun(se_tpg, lun);
+}
+
+int core_tpg_register(
+	struct target_core_fabric_ops *tfo,
+	struct se_wwn *se_wwn,
+	struct se_portal_group *se_tpg,
+	void *tpg_fabric_ptr,
+	int se_tpg_type)
+{
+	struct se_lun *lun;
+	u32 i;
+
+	se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
+				TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
+	if (!(se_tpg->tpg_lun_list)) {
+		printk(KERN_ERR "Unable to allocate struct se_portal_group->"
+				"tpg_lun_list\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		lun = &se_tpg->tpg_lun_list[i];
+		lun->unpacked_lun = i;
+		lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
+		atomic_set(&lun->lun_acl_count, 0);
+		init_completion(&lun->lun_shutdown_comp);
+		INIT_LIST_HEAD(&lun->lun_acl_list);
+		INIT_LIST_HEAD(&lun->lun_cmd_list);
+		spin_lock_init(&lun->lun_acl_lock);
+		spin_lock_init(&lun->lun_cmd_lock);
+		spin_lock_init(&lun->lun_sep_lock);
+	}
+
+	se_tpg->se_tpg_type = se_tpg_type;
+	se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
+	se_tpg->se_tpg_tfo = tfo;
+	se_tpg->se_tpg_wwn = se_wwn;
+	atomic_set(&se_tpg->tpg_pr_ref_count, 0);
+	INIT_LIST_HEAD(&se_tpg->acl_node_list);
+	INIT_LIST_HEAD(&se_tpg->se_tpg_list);
+	INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
+	spin_lock_init(&se_tpg->acl_node_lock);
+	spin_lock_init(&se_tpg->session_lock);
+	spin_lock_init(&se_tpg->tpg_lun_lock);
+
+	if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
+		if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
+			kfree(se_tpg);
+			return -ENOMEM;
+		}
+	}
+
+	spin_lock_bh(&se_global->se_tpg_lock);
+	list_add_tail(&se_tpg->se_tpg_list, &se_global->g_se_tpg_list);
+	spin_unlock_bh(&se_global->se_tpg_lock);
+
+	printk(KERN_INFO "TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
+		" endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
+		(se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
+		"Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
+		"None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_register);
+
+int core_tpg_deregister(struct se_portal_group *se_tpg)
+{
+	printk(KERN_INFO "TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
+		" for endpoint: %s Portal Tag %u\n",
+		(se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
+		"Normal" : "Discovery", TPG_TFO(se_tpg)->get_fabric_name(),
+		TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg),
+		TPG_TFO(se_tpg)->tpg_get_tag(se_tpg));
+
+	spin_lock_bh(&se_global->se_tpg_lock);
+	list_del(&se_tpg->se_tpg_list);
+	spin_unlock_bh(&se_global->se_tpg_lock);
+
+	while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
+		cpu_relax();
+
+	if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
+		core_tpg_release_virtual_lun0(se_tpg);
+
+	se_tpg->se_tpg_fabric_ptr = NULL;
+	kfree(se_tpg->tpg_lun_list);
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_deregister);
+
+struct se_lun *core_tpg_pre_addlun(
+	struct se_portal_group *tpg,
+	u32 unpacked_lun)
+{
+	struct se_lun *lun;
+
+	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
+		printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
+			"-1: %u for Target Portal Group: %u\n",
+			TPG_TFO(tpg)->get_fabric_name(),
+			unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		return ERR_PTR(-EOVERFLOW);
+	}
+
+	spin_lock(&tpg->tpg_lun_lock);
+	lun = &tpg->tpg_lun_list[unpacked_lun];
+	if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
+		printk(KERN_ERR "TPG Logical Unit Number: %u is already active"
+			" on %s Target Portal Group: %u, ignoring request.\n",
+			unpacked_lun, TPG_TFO(tpg)->get_fabric_name(),
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock(&tpg->tpg_lun_lock);
+		return ERR_PTR(-EINVAL);
+	}
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	return lun;
+}
+
+int core_tpg_post_addlun(
+	struct se_portal_group *tpg,
+	struct se_lun *lun,
+	u32 lun_access,
+	void *lun_ptr)
+{
+	if (core_dev_export(lun_ptr, tpg, lun) < 0)
+		return -1;
+
+	spin_lock(&tpg->tpg_lun_lock);
+	lun->lun_access = lun_access;
+	lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	return 0;
+}
+
+static void core_tpg_shutdown_lun(
+	struct se_portal_group *tpg,
+	struct se_lun *lun)
+{
+	core_clear_lun_from_tpg(lun, tpg);
+	transport_clear_lun_from_sessions(lun);
+}
+
+struct se_lun *core_tpg_pre_dellun(
+	struct se_portal_group *tpg,
+	u32 unpacked_lun,
+	int *ret)
+{
+	struct se_lun *lun;
+
+	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
+		printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
+			"-1: %u for Target Portal Group: %u\n",
+			TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
+			TRANSPORT_MAX_LUNS_PER_TPG-1,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		return ERR_PTR(-EOVERFLOW);
+	}
+
+	spin_lock(&tpg->tpg_lun_lock);
+	lun = &tpg->tpg_lun_list[unpacked_lun];
+	if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
+		printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
+			" Target Portal Group: %u, ignoring request.\n",
+			TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
+			TPG_TFO(tpg)->tpg_get_tag(tpg));
+		spin_unlock(&tpg->tpg_lun_lock);
+		return ERR_PTR(-ENODEV);
+	}
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	return lun;
+}
+
+int core_tpg_post_dellun(
+	struct se_portal_group *tpg,
+	struct se_lun *lun)
+{
+	core_tpg_shutdown_lun(tpg, lun);
+
+	core_dev_unexport(lun->lun_se_dev, tpg, lun);
+
+	spin_lock(&tpg->tpg_lun_lock);
+	lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	return 0;
+}
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
new file mode 100644
index 0000000..28b6292ff
--- /dev/null
+++ b/drivers/target/target_core_transport.c
@@ -0,0 +1,6134 @@
+/*******************************************************************************
+ * Filename:  target_core_transport.c
+ *
+ * This file contains the Generic Target Engine Core.
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/net.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/kthread.h>
+#include <linux/in.h>
+#include <linux/cdrom.h>
+#include <asm/unaligned.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/libsas.h> /* For TASK_ATTR_* */
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_tmr.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_alua.h"
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+#include "target_core_scdb.h"
+#include "target_core_ua.h"
+
+/* #define DEBUG_CDB_HANDLER */
+#ifdef DEBUG_CDB_HANDLER
+#define DEBUG_CDB_H(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CDB_H(x...)
+#endif
+
+/* #define DEBUG_CMD_MAP */
+#ifdef DEBUG_CMD_MAP
+#define DEBUG_CMD_M(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CMD_M(x...)
+#endif
+
+/* #define DEBUG_MEM_ALLOC */
+#ifdef DEBUG_MEM_ALLOC
+#define DEBUG_MEM(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_MEM(x...)
+#endif
+
+/* #define DEBUG_MEM2_ALLOC */
+#ifdef DEBUG_MEM2_ALLOC
+#define DEBUG_MEM2(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_MEM2(x...)
+#endif
+
+/* #define DEBUG_SG_CALC */
+#ifdef DEBUG_SG_CALC
+#define DEBUG_SC(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_SC(x...)
+#endif
+
+/* #define DEBUG_SE_OBJ */
+#ifdef DEBUG_SE_OBJ
+#define DEBUG_SO(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_SO(x...)
+#endif
+
+/* #define DEBUG_CMD_VOL */
+#ifdef DEBUG_CMD_VOL
+#define DEBUG_VOL(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_VOL(x...)
+#endif
+
+/* #define DEBUG_CMD_STOP */
+#ifdef DEBUG_CMD_STOP
+#define DEBUG_CS(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CS(x...)
+#endif
+
+/* #define DEBUG_PASSTHROUGH */
+#ifdef DEBUG_PASSTHROUGH
+#define DEBUG_PT(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_PT(x...)
+#endif
+
+/* #define DEBUG_TASK_STOP */
+#ifdef DEBUG_TASK_STOP
+#define DEBUG_TS(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TS(x...)
+#endif
+
+/* #define DEBUG_TRANSPORT_STOP */
+#ifdef DEBUG_TRANSPORT_STOP
+#define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TRANSPORT_S(x...)
+#endif
+
+/* #define DEBUG_TASK_FAILURE */
+#ifdef DEBUG_TASK_FAILURE
+#define DEBUG_TF(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TF(x...)
+#endif
+
+/* #define DEBUG_DEV_OFFLINE */
+#ifdef DEBUG_DEV_OFFLINE
+#define DEBUG_DO(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_DO(x...)
+#endif
+
+/* #define DEBUG_TASK_STATE */
+#ifdef DEBUG_TASK_STATE
+#define DEBUG_TSTATE(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TSTATE(x...)
+#endif
+
+/* #define DEBUG_STATUS_THR */
+#ifdef DEBUG_STATUS_THR
+#define DEBUG_ST(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_ST(x...)
+#endif
+
+/* #define DEBUG_TASK_TIMEOUT */
+#ifdef DEBUG_TASK_TIMEOUT
+#define DEBUG_TT(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_TT(x...)
+#endif
+
+/* #define DEBUG_GENERIC_REQUEST_FAILURE */
+#ifdef DEBUG_GENERIC_REQUEST_FAILURE
+#define DEBUG_GRF(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_GRF(x...)
+#endif
+
+/* #define DEBUG_SAM_TASK_ATTRS */
+#ifdef DEBUG_SAM_TASK_ATTRS
+#define DEBUG_STA(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_STA(x...)
+#endif
+
+struct se_global *se_global;
+
+static struct kmem_cache *se_cmd_cache;
+static struct kmem_cache *se_sess_cache;
+struct kmem_cache *se_tmr_req_cache;
+struct kmem_cache *se_ua_cache;
+struct kmem_cache *se_mem_cache;
+struct kmem_cache *t10_pr_reg_cache;
+struct kmem_cache *t10_alua_lu_gp_cache;
+struct kmem_cache *t10_alua_lu_gp_mem_cache;
+struct kmem_cache *t10_alua_tg_pt_gp_cache;
+struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
+
+/* Used for transport_dev_get_map_*() */
+typedef int (*map_func_t)(struct se_task *, u32);
+
+static int transport_generic_write_pending(struct se_cmd *);
+static int transport_processing_thread(void *);
+static int __transport_execute_tasks(struct se_device *dev);
+static void transport_complete_task_attr(struct se_cmd *cmd);
+static void transport_direct_request_timeout(struct se_cmd *cmd);
+static void transport_free_dev_tasks(struct se_cmd *cmd);
+static u32 transport_generic_get_cdb_count(struct se_cmd *cmd,
+		unsigned long long starting_lba, u32 sectors,
+		enum dma_data_direction data_direction,
+		struct list_head *mem_list, int set_counts);
+static int transport_generic_get_mem(struct se_cmd *cmd, u32 length,
+		u32 dma_size);
+static int transport_generic_remove(struct se_cmd *cmd,
+		int release_to_pool, int session_reinstatement);
+static int transport_get_sectors(struct se_cmd *cmd);
+static struct list_head *transport_init_se_mem_list(void);
+static int transport_map_sg_to_mem(struct se_cmd *cmd,
+		struct list_head *se_mem_list, void *in_mem,
+		u32 *se_mem_cnt);
+static void transport_memcpy_se_mem_read_contig(struct se_cmd *cmd,
+		unsigned char *dst, struct list_head *se_mem_list);
+static void transport_release_fe_cmd(struct se_cmd *cmd);
+static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
+		struct se_queue_obj *qobj);
+static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
+static void transport_stop_all_task_timers(struct se_cmd *cmd);
+
+int transport_emulate_control_cdb(struct se_task *task);
+
+int init_se_global(void)
+{
+	struct se_global *global;
+
+	global = kzalloc(sizeof(struct se_global), GFP_KERNEL);
+	if (!(global)) {
+		printk(KERN_ERR "Unable to allocate memory for struct se_global\n");
+		return -1;
+	}
+
+	INIT_LIST_HEAD(&global->g_lu_gps_list);
+	INIT_LIST_HEAD(&global->g_se_tpg_list);
+	INIT_LIST_HEAD(&global->g_hba_list);
+	INIT_LIST_HEAD(&global->g_se_dev_list);
+	spin_lock_init(&global->g_device_lock);
+	spin_lock_init(&global->hba_lock);
+	spin_lock_init(&global->se_tpg_lock);
+	spin_lock_init(&global->lu_gps_lock);
+	spin_lock_init(&global->plugin_class_lock);
+
+	se_cmd_cache = kmem_cache_create("se_cmd_cache",
+			sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
+	if (!(se_cmd_cache)) {
+		printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n");
+		goto out;
+	}
+	se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
+			sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
+			0, NULL);
+	if (!(se_tmr_req_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req"
+				" failed\n");
+		goto out;
+	}
+	se_sess_cache = kmem_cache_create("se_sess_cache",
+			sizeof(struct se_session), __alignof__(struct se_session),
+			0, NULL);
+	if (!(se_sess_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for struct se_session"
+				" failed\n");
+		goto out;
+	}
+	se_ua_cache = kmem_cache_create("se_ua_cache",
+			sizeof(struct se_ua), __alignof__(struct se_ua),
+			0, NULL);
+	if (!(se_ua_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n");
+		goto out;
+	}
+	se_mem_cache = kmem_cache_create("se_mem_cache",
+			sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL);
+	if (!(se_mem_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n");
+		goto out;
+	}
+	t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
+			sizeof(struct t10_pr_registration),
+			__alignof__(struct t10_pr_registration), 0, NULL);
+	if (!(t10_pr_reg_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration"
+				" failed\n");
+		goto out;
+	}
+	t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
+			sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
+			0, NULL);
+	if (!(t10_alua_lu_gp_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache"
+				" failed\n");
+		goto out;
+	}
+	t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
+			sizeof(struct t10_alua_lu_gp_member),
+			__alignof__(struct t10_alua_lu_gp_member), 0, NULL);
+	if (!(t10_alua_lu_gp_mem_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_"
+				"cache failed\n");
+		goto out;
+	}
+	t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
+			sizeof(struct t10_alua_tg_pt_gp),
+			__alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
+	if (!(t10_alua_tg_pt_gp_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
+				"cache failed\n");
+		goto out;
+	}
+	t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
+			"t10_alua_tg_pt_gp_mem_cache",
+			sizeof(struct t10_alua_tg_pt_gp_member),
+			__alignof__(struct t10_alua_tg_pt_gp_member),
+			0, NULL);
+	if (!(t10_alua_tg_pt_gp_mem_cache)) {
+		printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
+				"mem_t failed\n");
+		goto out;
+	}
+
+	se_global = global;
+
+	return 0;
+out:
+	if (se_cmd_cache)
+		kmem_cache_destroy(se_cmd_cache);
+	if (se_tmr_req_cache)
+		kmem_cache_destroy(se_tmr_req_cache);
+	if (se_sess_cache)
+		kmem_cache_destroy(se_sess_cache);
+	if (se_ua_cache)
+		kmem_cache_destroy(se_ua_cache);
+	if (se_mem_cache)
+		kmem_cache_destroy(se_mem_cache);
+	if (t10_pr_reg_cache)
+		kmem_cache_destroy(t10_pr_reg_cache);
+	if (t10_alua_lu_gp_cache)
+		kmem_cache_destroy(t10_alua_lu_gp_cache);
+	if (t10_alua_lu_gp_mem_cache)
+		kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
+	if (t10_alua_tg_pt_gp_cache)
+		kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
+	if (t10_alua_tg_pt_gp_mem_cache)
+		kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
+	kfree(global);
+	return -1;
+}
+
+void release_se_global(void)
+{
+	struct se_global *global;
+
+	global = se_global;
+	if (!(global))
+		return;
+
+	kmem_cache_destroy(se_cmd_cache);
+	kmem_cache_destroy(se_tmr_req_cache);
+	kmem_cache_destroy(se_sess_cache);
+	kmem_cache_destroy(se_ua_cache);
+	kmem_cache_destroy(se_mem_cache);
+	kmem_cache_destroy(t10_pr_reg_cache);
+	kmem_cache_destroy(t10_alua_lu_gp_cache);
+	kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
+	kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
+	kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
+	kfree(global);
+
+	se_global = NULL;
+}
+
+void transport_init_queue_obj(struct se_queue_obj *qobj)
+{
+	atomic_set(&qobj->queue_cnt, 0);
+	INIT_LIST_HEAD(&qobj->qobj_list);
+	init_waitqueue_head(&qobj->thread_wq);
+	spin_lock_init(&qobj->cmd_queue_lock);
+}
+EXPORT_SYMBOL(transport_init_queue_obj);
+
+static int transport_subsystem_reqmods(void)
+{
+	int ret;
+
+	ret = request_module("target_core_iblock");
+	if (ret != 0)
+		printk(KERN_ERR "Unable to load target_core_iblock\n");
+
+	ret = request_module("target_core_file");
+	if (ret != 0)
+		printk(KERN_ERR "Unable to load target_core_file\n");
+
+	ret = request_module("target_core_pscsi");
+	if (ret != 0)
+		printk(KERN_ERR "Unable to load target_core_pscsi\n");
+
+	ret = request_module("target_core_stgt");
+	if (ret != 0)
+		printk(KERN_ERR "Unable to load target_core_stgt\n");
+
+	return 0;
+}
+
+int transport_subsystem_check_init(void)
+{
+	if (se_global->g_sub_api_initialized)
+		return 0;
+	/*
+	 * Request the loading of known TCM subsystem plugins..
+	 */
+	if (transport_subsystem_reqmods() < 0)
+		return -1;
+
+	se_global->g_sub_api_initialized = 1;
+	return 0;
+}
+
+struct se_session *transport_init_session(void)
+{
+	struct se_session *se_sess;
+
+	se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
+	if (!(se_sess)) {
+		printk(KERN_ERR "Unable to allocate struct se_session from"
+				" se_sess_cache\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	INIT_LIST_HEAD(&se_sess->sess_list);
+	INIT_LIST_HEAD(&se_sess->sess_acl_list);
+	atomic_set(&se_sess->mib_ref_count, 0);
+
+	return se_sess;
+}
+EXPORT_SYMBOL(transport_init_session);
+
+/*
+ * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
+ */
+void __transport_register_session(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct se_session *se_sess,
+	void *fabric_sess_ptr)
+{
+	unsigned char buf[PR_REG_ISID_LEN];
+
+	se_sess->se_tpg = se_tpg;
+	se_sess->fabric_sess_ptr = fabric_sess_ptr;
+	/*
+	 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
+	 *
+	 * Only set for struct se_session's that will actually be moving I/O.
+	 * eg: *NOT* discovery sessions.
+	 */
+	if (se_nacl) {
+		/*
+		 * If the fabric module supports an ISID based TransportID,
+		 * save this value in binary from the fabric I_T Nexus now.
+		 */
+		if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) {
+			memset(&buf[0], 0, PR_REG_ISID_LEN);
+			TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess,
+					&buf[0], PR_REG_ISID_LEN);
+			se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
+		}
+		spin_lock_irq(&se_nacl->nacl_sess_lock);
+		/*
+		 * The se_nacl->nacl_sess pointer will be set to the
+		 * last active I_T Nexus for each struct se_node_acl.
+		 */
+		se_nacl->nacl_sess = se_sess;
+
+		list_add_tail(&se_sess->sess_acl_list,
+			      &se_nacl->acl_sess_list);
+		spin_unlock_irq(&se_nacl->nacl_sess_lock);
+	}
+	list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
+
+	printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
+		TPG_TFO(se_tpg)->get_fabric_name(), se_sess->fabric_sess_ptr);
+}
+EXPORT_SYMBOL(__transport_register_session);
+
+void transport_register_session(
+	struct se_portal_group *se_tpg,
+	struct se_node_acl *se_nacl,
+	struct se_session *se_sess,
+	void *fabric_sess_ptr)
+{
+	spin_lock_bh(&se_tpg->session_lock);
+	__transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
+	spin_unlock_bh(&se_tpg->session_lock);
+}
+EXPORT_SYMBOL(transport_register_session);
+
+void transport_deregister_session_configfs(struct se_session *se_sess)
+{
+	struct se_node_acl *se_nacl;
+
+	/*
+	 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
+	 */
+	se_nacl = se_sess->se_node_acl;
+	if ((se_nacl)) {
+		spin_lock_irq(&se_nacl->nacl_sess_lock);
+		list_del(&se_sess->sess_acl_list);
+		/*
+		 * If the session list is empty, then clear the pointer.
+		 * Otherwise, set the struct se_session pointer from the tail
+		 * element of the per struct se_node_acl active session list.
+		 */
+		if (list_empty(&se_nacl->acl_sess_list))
+			se_nacl->nacl_sess = NULL;
+		else {
+			se_nacl->nacl_sess = container_of(
+					se_nacl->acl_sess_list.prev,
+					struct se_session, sess_acl_list);
+		}
+		spin_unlock_irq(&se_nacl->nacl_sess_lock);
+	}
+}
+EXPORT_SYMBOL(transport_deregister_session_configfs);
+
+void transport_free_session(struct se_session *se_sess)
+{
+	kmem_cache_free(se_sess_cache, se_sess);
+}
+EXPORT_SYMBOL(transport_free_session);
+
+void transport_deregister_session(struct se_session *se_sess)
+{
+	struct se_portal_group *se_tpg = se_sess->se_tpg;
+	struct se_node_acl *se_nacl;
+
+	if (!(se_tpg)) {
+		transport_free_session(se_sess);
+		return;
+	}
+	/*
+	 * Wait for possible reference in drivers/target/target_core_mib.c:
+	 * scsi_att_intr_port_seq_show()
+	 */
+	while (atomic_read(&se_sess->mib_ref_count) != 0)
+		cpu_relax();
+
+	spin_lock_bh(&se_tpg->session_lock);
+	list_del(&se_sess->sess_list);
+	se_sess->se_tpg = NULL;
+	se_sess->fabric_sess_ptr = NULL;
+	spin_unlock_bh(&se_tpg->session_lock);
+
+	/*
+	 * Determine if we need to do extra work for this initiator node's
+	 * struct se_node_acl if it had been previously dynamically generated.
+	 */
+	se_nacl = se_sess->se_node_acl;
+	if ((se_nacl)) {
+		spin_lock_bh(&se_tpg->acl_node_lock);
+		if (se_nacl->dynamic_node_acl) {
+			if (!(TPG_TFO(se_tpg)->tpg_check_demo_mode_cache(
+					se_tpg))) {
+				list_del(&se_nacl->acl_list);
+				se_tpg->num_node_acls--;
+				spin_unlock_bh(&se_tpg->acl_node_lock);
+
+				core_tpg_wait_for_nacl_pr_ref(se_nacl);
+				core_tpg_wait_for_mib_ref(se_nacl);
+				core_free_device_list_for_node(se_nacl, se_tpg);
+				TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg,
+						se_nacl);
+				spin_lock_bh(&se_tpg->acl_node_lock);
+			}
+		}
+		spin_unlock_bh(&se_tpg->acl_node_lock);
+	}
+
+	transport_free_session(se_sess);
+
+	printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n",
+		TPG_TFO(se_tpg)->get_fabric_name());
+}
+EXPORT_SYMBOL(transport_deregister_session);
+
+/*
+ * Called with T_TASK(cmd)->t_state_lock held.
+ */
+static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
+{
+	struct se_device *dev;
+	struct se_task *task;
+	unsigned long flags;
+
+	if (!T_TASK(cmd))
+		return;
+
+	list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+		dev = task->se_dev;
+		if (!(dev))
+			continue;
+
+		if (atomic_read(&task->task_active))
+			continue;
+
+		if (!(atomic_read(&task->task_state_active)))
+			continue;
+
+		spin_lock_irqsave(&dev->execute_task_lock, flags);
+		list_del(&task->t_state_list);
+		DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
+			CMD_TFO(cmd)->tfo_get_task_tag(cmd), dev, task);
+		spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+
+		atomic_set(&task->task_state_active, 0);
+		atomic_dec(&T_TASK(cmd)->t_task_cdbs_ex_left);
+	}
+}
+
+/*	transport_cmd_check_stop():
+ *
+ *	'transport_off = 1' determines if t_transport_active should be cleared.
+ *	'transport_off = 2' determines if task_dev_state should be removed.
+ *
+ *	A non-zero u8 t_state sets cmd->t_state.
+ *	Returns 1 when command is stopped, else 0.
+ */
+static int transport_cmd_check_stop(
+	struct se_cmd *cmd,
+	int transport_off,
+	u8 t_state)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	/*
+	 * Determine if IOCTL context caller in requesting the stopping of this
+	 * command for LUN shutdown purposes.
+	 */
+	if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
+		DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)"
+			" == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
+			CMD_TFO(cmd)->get_task_tag(cmd));
+
+		cmd->deferred_t_state = cmd->t_state;
+		cmd->t_state = TRANSPORT_DEFERRED_CMD;
+		atomic_set(&T_TASK(cmd)->t_transport_active, 0);
+		if (transport_off == 2)
+			transport_all_task_dev_remove_state(cmd);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+		complete(&T_TASK(cmd)->transport_lun_stop_comp);
+		return 1;
+	}
+	/*
+	 * Determine if frontend context caller is requesting the stopping of
+	 * this command for frontend excpections.
+	 */
+	if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
+		DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) =="
+			" TRUE for ITT: 0x%08x\n", __func__, __LINE__,
+			CMD_TFO(cmd)->get_task_tag(cmd));
+
+		cmd->deferred_t_state = cmd->t_state;
+		cmd->t_state = TRANSPORT_DEFERRED_CMD;
+		if (transport_off == 2)
+			transport_all_task_dev_remove_state(cmd);
+
+		/*
+		 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
+		 * to FE.
+		 */
+		if (transport_off == 2)
+			cmd->se_lun = NULL;
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+		complete(&T_TASK(cmd)->t_transport_stop_comp);
+		return 1;
+	}
+	if (transport_off) {
+		atomic_set(&T_TASK(cmd)->t_transport_active, 0);
+		if (transport_off == 2) {
+			transport_all_task_dev_remove_state(cmd);
+			/*
+			 * Clear struct se_cmd->se_lun before the transport_off == 2
+			 * handoff to fabric module.
+			 */
+			cmd->se_lun = NULL;
+			/*
+			 * Some fabric modules like tcm_loop can release
+			 * their internally allocated I/O refrence now and
+			 * struct se_cmd now.
+			 */
+			if (CMD_TFO(cmd)->check_stop_free != NULL) {
+				spin_unlock_irqrestore(
+					&T_TASK(cmd)->t_state_lock, flags);
+
+				CMD_TFO(cmd)->check_stop_free(cmd);
+				return 1;
+			}
+		}
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+		return 0;
+	} else if (t_state)
+		cmd->t_state = t_state;
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	return 0;
+}
+
+static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
+{
+	return transport_cmd_check_stop(cmd, 2, 0);
+}
+
+static void transport_lun_remove_cmd(struct se_cmd *cmd)
+{
+	struct se_lun *lun = SE_LUN(cmd);
+	unsigned long flags;
+
+	if (!lun)
+		return;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		goto check_lun;
+	}
+	atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+	transport_all_task_dev_remove_state(cmd);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	transport_free_dev_tasks(cmd);
+
+check_lun:
+	spin_lock_irqsave(&lun->lun_cmd_lock, flags);
+	if (atomic_read(&T_TASK(cmd)->transport_lun_active)) {
+		list_del(&cmd->se_lun_list);
+		atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
+#if 0
+		printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n"
+			CMD_TFO(cmd)->get_task_tag(cmd), lun->unpacked_lun);
+#endif
+	}
+	spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
+}
+
+void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
+{
+	transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
+	transport_lun_remove_cmd(cmd);
+
+	if (transport_cmd_check_stop_to_fabric(cmd))
+		return;
+	if (remove)
+		transport_generic_remove(cmd, 0, 0);
+}
+
+void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
+{
+	transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
+
+	if (transport_cmd_check_stop_to_fabric(cmd))
+		return;
+
+	transport_generic_remove(cmd, 0, 0);
+}
+
+static int transport_add_cmd_to_queue(
+	struct se_cmd *cmd,
+	int t_state)
+{
+	struct se_device *dev = cmd->se_dev;
+	struct se_queue_obj *qobj = dev->dev_queue_obj;
+	struct se_queue_req *qr;
+	unsigned long flags;
+
+	qr = kzalloc(sizeof(struct se_queue_req), GFP_ATOMIC);
+	if (!(qr)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+				" struct se_queue_req\n");
+		return -1;
+	}
+	INIT_LIST_HEAD(&qr->qr_list);
+
+	qr->cmd = (void *)cmd;
+	qr->state = t_state;
+
+	if (t_state) {
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+		cmd->t_state = t_state;
+		atomic_set(&T_TASK(cmd)->t_transport_active, 1);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+	}
+
+	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+	list_add_tail(&qr->qr_list, &qobj->qobj_list);
+	atomic_inc(&T_TASK(cmd)->t_transport_queue_active);
+	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+	atomic_inc(&qobj->queue_cnt);
+	wake_up_interruptible(&qobj->thread_wq);
+	return 0;
+}
+
+/*
+ * Called with struct se_queue_obj->cmd_queue_lock held.
+ */
+static struct se_queue_req *
+__transport_get_qr_from_queue(struct se_queue_obj *qobj)
+{
+	struct se_cmd *cmd;
+	struct se_queue_req *qr = NULL;
+
+	if (list_empty(&qobj->qobj_list))
+		return NULL;
+
+	list_for_each_entry(qr, &qobj->qobj_list, qr_list)
+		break;
+
+	if (qr->cmd) {
+		cmd = (struct se_cmd *)qr->cmd;
+		atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
+	}
+	list_del(&qr->qr_list);
+	atomic_dec(&qobj->queue_cnt);
+
+	return qr;
+}
+
+static struct se_queue_req *
+transport_get_qr_from_queue(struct se_queue_obj *qobj)
+{
+	struct se_cmd *cmd;
+	struct se_queue_req *qr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+	if (list_empty(&qobj->qobj_list)) {
+		spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+		return NULL;
+	}
+
+	list_for_each_entry(qr, &qobj->qobj_list, qr_list)
+		break;
+
+	if (qr->cmd) {
+		cmd = (struct se_cmd *)qr->cmd;
+		atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
+	}
+	list_del(&qr->qr_list);
+	atomic_dec(&qobj->queue_cnt);
+	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+	return qr;
+}
+
+static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
+		struct se_queue_obj *qobj)
+{
+	struct se_cmd *q_cmd;
+	struct se_queue_req *qr = NULL, *qr_p = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
+	if (!(atomic_read(&T_TASK(cmd)->t_transport_queue_active))) {
+		spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+		return;
+	}
+
+	list_for_each_entry_safe(qr, qr_p, &qobj->qobj_list, qr_list) {
+		q_cmd = (struct se_cmd *)qr->cmd;
+		if (q_cmd != cmd)
+			continue;
+
+		atomic_dec(&T_TASK(q_cmd)->t_transport_queue_active);
+		atomic_dec(&qobj->queue_cnt);
+		list_del(&qr->qr_list);
+		kfree(qr);
+	}
+	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
+
+	if (atomic_read(&T_TASK(cmd)->t_transport_queue_active)) {
+		printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n",
+			CMD_TFO(cmd)->get_task_tag(cmd),
+			atomic_read(&T_TASK(cmd)->t_transport_queue_active));
+	}
+}
+
+/*
+ * Completion function used by TCM subsystem plugins (such as FILEIO)
+ * for queueing up response from struct se_subsystem_api->do_task()
+ */
+void transport_complete_sync_cache(struct se_cmd *cmd, int good)
+{
+	struct se_task *task = list_entry(T_TASK(cmd)->t_task_list.next,
+				struct se_task, t_list);
+
+	if (good) {
+		cmd->scsi_status = SAM_STAT_GOOD;
+		task->task_scsi_status = GOOD;
+	} else {
+		task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
+		task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
+		TASK_CMD(task)->transport_error_status =
+					PYX_TRANSPORT_ILLEGAL_REQUEST;
+	}
+
+	transport_complete_task(task, good);
+}
+EXPORT_SYMBOL(transport_complete_sync_cache);
+
+/*	transport_complete_task():
+ *
+ *	Called from interrupt and non interrupt context depending
+ *	on the transport plugin.
+ */
+void transport_complete_task(struct se_task *task, int success)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+	struct se_device *dev = task->se_dev;
+	int t_state;
+	unsigned long flags;
+#if 0
+	printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task,
+			T_TASK(cmd)->t_task_cdb[0], dev);
+#endif
+	if (dev) {
+		spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
+		atomic_inc(&dev->depth_left);
+		atomic_inc(&SE_HBA(dev)->left_queue_depth);
+		spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+	}
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	atomic_set(&task->task_active, 0);
+
+	/*
+	 * See if any sense data exists, if so set the TASK_SENSE flag.
+	 * Also check for any other post completion work that needs to be
+	 * done by the plugins.
+	 */
+	if (dev && dev->transport->transport_complete) {
+		if (dev->transport->transport_complete(task) != 0) {
+			cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
+			task->task_sense = 1;
+			success = 1;
+		}
+	}
+
+	/*
+	 * See if we are waiting for outstanding struct se_task
+	 * to complete for an exception condition
+	 */
+	if (atomic_read(&task->task_stop)) {
+		/*
+		 * Decrement T_TASK(cmd)->t_se_count if this task had
+		 * previously thrown its timeout exception handler.
+		 */
+		if (atomic_read(&task->task_timeout)) {
+			atomic_dec(&T_TASK(cmd)->t_se_count);
+			atomic_set(&task->task_timeout, 0);
+		}
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+		complete(&task->task_stop_comp);
+		return;
+	}
+	/*
+	 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
+	 * left counter to determine when the struct se_cmd is ready to be queued to
+	 * the processing thread.
+	 */
+	if (atomic_read(&task->task_timeout)) {
+		if (!(atomic_dec_and_test(
+				&T_TASK(cmd)->t_task_cdbs_timeout_left))) {
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+				flags);
+			return;
+		}
+		t_state = TRANSPORT_COMPLETE_TIMEOUT;
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+		transport_add_cmd_to_queue(cmd, t_state);
+		return;
+	}
+	atomic_dec(&T_TASK(cmd)->t_task_cdbs_timeout_left);
+
+	/*
+	 * Decrement the outstanding t_task_cdbs_left count.  The last
+	 * struct se_task from struct se_cmd will complete itself into the
+	 * device queue depending upon int success.
+	 */
+	if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
+		if (!success)
+			T_TASK(cmd)->t_tasks_failed = 1;
+
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return;
+	}
+
+	if (!success || T_TASK(cmd)->t_tasks_failed) {
+		t_state = TRANSPORT_COMPLETE_FAILURE;
+		if (!task->task_error_status) {
+			task->task_error_status =
+				PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+			cmd->transport_error_status =
+				PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+		}
+	} else {
+		atomic_set(&T_TASK(cmd)->t_transport_complete, 1);
+		t_state = TRANSPORT_COMPLETE_OK;
+	}
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	transport_add_cmd_to_queue(cmd, t_state);
+}
+EXPORT_SYMBOL(transport_complete_task);
+
+/*
+ * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
+ * struct se_task list are ready to be added to the active execution list
+ * struct se_device
+
+ * Called with se_dev_t->execute_task_lock called.
+ */
+static inline int transport_add_task_check_sam_attr(
+	struct se_task *task,
+	struct se_task *task_prev,
+	struct se_device *dev)
+{
+	/*
+	 * No SAM Task attribute emulation enabled, add to tail of
+	 * execution queue
+	 */
+	if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
+		list_add_tail(&task->t_execute_list, &dev->execute_task_list);
+		return 0;
+	}
+	/*
+	 * HEAD_OF_QUEUE attribute for received CDB, which means
+	 * the first task that is associated with a struct se_cmd goes to
+	 * head of the struct se_device->execute_task_list, and task_prev
+	 * after that for each subsequent task
+	 */
+	if (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ) {
+		list_add(&task->t_execute_list,
+				(task_prev != NULL) ?
+				&task_prev->t_execute_list :
+				&dev->execute_task_list);
+
+		DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
+				" in execution queue\n",
+				T_TASK(task->task_se_cmd)->t_task_cdb[0]);
+		return 1;
+	}
+	/*
+	 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
+	 * transitioned from Dermant -> Active state, and are added to the end
+	 * of the struct se_device->execute_task_list
+	 */
+	list_add_tail(&task->t_execute_list, &dev->execute_task_list);
+	return 0;
+}
+
+/*	__transport_add_task_to_execute_queue():
+ *
+ *	Called with se_dev_t->execute_task_lock called.
+ */
+static void __transport_add_task_to_execute_queue(
+	struct se_task *task,
+	struct se_task *task_prev,
+	struct se_device *dev)
+{
+	int head_of_queue;
+
+	head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
+	atomic_inc(&dev->execute_tasks);
+
+	if (atomic_read(&task->task_state_active))
+		return;
+	/*
+	 * Determine if this task needs to go to HEAD_OF_QUEUE for the
+	 * state list as well.  Running with SAM Task Attribute emulation
+	 * will always return head_of_queue == 0 here
+	 */
+	if (head_of_queue)
+		list_add(&task->t_state_list, (task_prev) ?
+				&task_prev->t_state_list :
+				&dev->state_task_list);
+	else
+		list_add_tail(&task->t_state_list, &dev->state_task_list);
+
+	atomic_set(&task->task_state_active, 1);
+
+	DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
+		CMD_TFO(task->task_se_cmd)->get_task_tag(task->task_se_cmd),
+		task, dev);
+}
+
+static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
+{
+	struct se_device *dev;
+	struct se_task *task;
+	unsigned long flags;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+		dev = task->se_dev;
+
+		if (atomic_read(&task->task_state_active))
+			continue;
+
+		spin_lock(&dev->execute_task_lock);
+		list_add_tail(&task->t_state_list, &dev->state_task_list);
+		atomic_set(&task->task_state_active, 1);
+
+		DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
+			CMD_TFO(task->task_se_cmd)->get_task_tag(
+			task->task_se_cmd), task, dev);
+
+		spin_unlock(&dev->execute_task_lock);
+	}
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_task *task, *task_prev = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->execute_task_lock, flags);
+	list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+		if (atomic_read(&task->task_execute_queue))
+			continue;
+		/*
+		 * __transport_add_task_to_execute_queue() handles the
+		 * SAM Task Attribute emulation if enabled
+		 */
+		__transport_add_task_to_execute_queue(task, task_prev, dev);
+		atomic_set(&task->task_execute_queue, 1);
+		task_prev = task;
+	}
+	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+
+	return;
+}
+
+/*	transport_get_task_from_execute_queue():
+ *
+ *	Called with dev->execute_task_lock held.
+ */
+static struct se_task *
+transport_get_task_from_execute_queue(struct se_device *dev)
+{
+	struct se_task *task;
+
+	if (list_empty(&dev->execute_task_list))
+		return NULL;
+
+	list_for_each_entry(task, &dev->execute_task_list, t_execute_list)
+		break;
+
+	list_del(&task->t_execute_list);
+	atomic_dec(&dev->execute_tasks);
+
+	return task;
+}
+
+/*	transport_remove_task_from_execute_queue():
+ *
+ *
+ */
+static void transport_remove_task_from_execute_queue(
+	struct se_task *task,
+	struct se_device *dev)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->execute_task_lock, flags);
+	list_del(&task->t_execute_list);
+	atomic_dec(&dev->execute_tasks);
+	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+}
+
+unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
+{
+	switch (cmd->data_direction) {
+	case DMA_NONE:
+		return "NONE";
+	case DMA_FROM_DEVICE:
+		return "READ";
+	case DMA_TO_DEVICE:
+		return "WRITE";
+	case DMA_BIDIRECTIONAL:
+		return "BIDI";
+	default:
+		break;
+	}
+
+	return "UNKNOWN";
+}
+
+void transport_dump_dev_state(
+	struct se_device *dev,
+	char *b,
+	int *bl)
+{
+	*bl += sprintf(b + *bl, "Status: ");
+	switch (dev->dev_status) {
+	case TRANSPORT_DEVICE_ACTIVATED:
+		*bl += sprintf(b + *bl, "ACTIVATED");
+		break;
+	case TRANSPORT_DEVICE_DEACTIVATED:
+		*bl += sprintf(b + *bl, "DEACTIVATED");
+		break;
+	case TRANSPORT_DEVICE_SHUTDOWN:
+		*bl += sprintf(b + *bl, "SHUTDOWN");
+		break;
+	case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
+	case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
+		*bl += sprintf(b + *bl, "OFFLINE");
+		break;
+	default:
+		*bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
+		break;
+	}
+
+	*bl += sprintf(b + *bl, "  Execute/Left/Max Queue Depth: %d/%d/%d",
+		atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
+		dev->queue_depth);
+	*bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
+		DEV_ATTRIB(dev)->block_size, DEV_ATTRIB(dev)->max_sectors);
+	*bl += sprintf(b + *bl, "        ");
+}
+
+/*	transport_release_all_cmds():
+ *
+ *
+ */
+static void transport_release_all_cmds(struct se_device *dev)
+{
+	struct se_cmd *cmd = NULL;
+	struct se_queue_req *qr = NULL, *qr_p = NULL;
+	int bug_out = 0, t_state;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+	list_for_each_entry_safe(qr, qr_p, &dev->dev_queue_obj->qobj_list,
+				qr_list) {
+
+		cmd = (struct se_cmd *)qr->cmd;
+		t_state = qr->state;
+		list_del(&qr->qr_list);
+		kfree(qr);
+		spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock,
+				flags);
+
+		printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u,"
+			" t_state: %u directly\n",
+			CMD_TFO(cmd)->get_task_tag(cmd),
+			CMD_TFO(cmd)->get_cmd_state(cmd), t_state);
+
+		transport_release_fe_cmd(cmd);
+		bug_out = 1;
+
+		spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+	}
+	spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
+#if 0
+	if (bug_out)
+		BUG();
+#endif
+}
+
+void transport_dump_vpd_proto_id(
+	struct t10_vpd *vpd,
+	unsigned char *p_buf,
+	int p_buf_len)
+{
+	unsigned char buf[VPD_TMP_BUF_SIZE];
+	int len;
+
+	memset(buf, 0, VPD_TMP_BUF_SIZE);
+	len = sprintf(buf, "T10 VPD Protocol Identifier: ");
+
+	switch (vpd->protocol_identifier) {
+	case 0x00:
+		sprintf(buf+len, "Fibre Channel\n");
+		break;
+	case 0x10:
+		sprintf(buf+len, "Parallel SCSI\n");
+		break;
+	case 0x20:
+		sprintf(buf+len, "SSA\n");
+		break;
+	case 0x30:
+		sprintf(buf+len, "IEEE 1394\n");
+		break;
+	case 0x40:
+		sprintf(buf+len, "SCSI Remote Direct Memory Access"
+				" Protocol\n");
+		break;
+	case 0x50:
+		sprintf(buf+len, "Internet SCSI (iSCSI)\n");
+		break;
+	case 0x60:
+		sprintf(buf+len, "SAS Serial SCSI Protocol\n");
+		break;
+	case 0x70:
+		sprintf(buf+len, "Automation/Drive Interface Transport"
+				" Protocol\n");
+		break;
+	case 0x80:
+		sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
+		break;
+	default:
+		sprintf(buf+len, "Unknown 0x%02x\n",
+				vpd->protocol_identifier);
+		break;
+	}
+
+	if (p_buf)
+		strncpy(p_buf, buf, p_buf_len);
+	else
+		printk(KERN_INFO "%s", buf);
+}
+
+void
+transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
+{
+	/*
+	 * Check if the Protocol Identifier Valid (PIV) bit is set..
+	 *
+	 * from spc3r23.pdf section 7.5.1
+	 */
+	 if (page_83[1] & 0x80) {
+		vpd->protocol_identifier = (page_83[0] & 0xf0);
+		vpd->protocol_identifier_set = 1;
+		transport_dump_vpd_proto_id(vpd, NULL, 0);
+	}
+}
+EXPORT_SYMBOL(transport_set_vpd_proto_id);
+
+int transport_dump_vpd_assoc(
+	struct t10_vpd *vpd,
+	unsigned char *p_buf,
+	int p_buf_len)
+{
+	unsigned char buf[VPD_TMP_BUF_SIZE];
+	int ret = 0, len;
+
+	memset(buf, 0, VPD_TMP_BUF_SIZE);
+	len = sprintf(buf, "T10 VPD Identifier Association: ");
+
+	switch (vpd->association) {
+	case 0x00:
+		sprintf(buf+len, "addressed logical unit\n");
+		break;
+	case 0x10:
+		sprintf(buf+len, "target port\n");
+		break;
+	case 0x20:
+		sprintf(buf+len, "SCSI target device\n");
+		break;
+	default:
+		sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
+		ret = -1;
+		break;
+	}
+
+	if (p_buf)
+		strncpy(p_buf, buf, p_buf_len);
+	else
+		printk("%s", buf);
+
+	return ret;
+}
+
+int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
+{
+	/*
+	 * The VPD identification association..
+	 *
+	 * from spc3r23.pdf Section 7.6.3.1 Table 297
+	 */
+	vpd->association = (page_83[1] & 0x30);
+	return transport_dump_vpd_assoc(vpd, NULL, 0);
+}
+EXPORT_SYMBOL(transport_set_vpd_assoc);
+
+int transport_dump_vpd_ident_type(
+	struct t10_vpd *vpd,
+	unsigned char *p_buf,
+	int p_buf_len)
+{
+	unsigned char buf[VPD_TMP_BUF_SIZE];
+	int ret = 0, len;
+
+	memset(buf, 0, VPD_TMP_BUF_SIZE);
+	len = sprintf(buf, "T10 VPD Identifier Type: ");
+
+	switch (vpd->device_identifier_type) {
+	case 0x00:
+		sprintf(buf+len, "Vendor specific\n");
+		break;
+	case 0x01:
+		sprintf(buf+len, "T10 Vendor ID based\n");
+		break;
+	case 0x02:
+		sprintf(buf+len, "EUI-64 based\n");
+		break;
+	case 0x03:
+		sprintf(buf+len, "NAA\n");
+		break;
+	case 0x04:
+		sprintf(buf+len, "Relative target port identifier\n");
+		break;
+	case 0x08:
+		sprintf(buf+len, "SCSI name string\n");
+		break;
+	default:
+		sprintf(buf+len, "Unsupported: 0x%02x\n",
+				vpd->device_identifier_type);
+		ret = -1;
+		break;
+	}
+
+	if (p_buf)
+		strncpy(p_buf, buf, p_buf_len);
+	else
+		printk("%s", buf);
+
+	return ret;
+}
+
+int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
+{
+	/*
+	 * The VPD identifier type..
+	 *
+	 * from spc3r23.pdf Section 7.6.3.1 Table 298
+	 */
+	vpd->device_identifier_type = (page_83[1] & 0x0f);
+	return transport_dump_vpd_ident_type(vpd, NULL, 0);
+}
+EXPORT_SYMBOL(transport_set_vpd_ident_type);
+
+int transport_dump_vpd_ident(
+	struct t10_vpd *vpd,
+	unsigned char *p_buf,
+	int p_buf_len)
+{
+	unsigned char buf[VPD_TMP_BUF_SIZE];
+	int ret = 0;
+
+	memset(buf, 0, VPD_TMP_BUF_SIZE);
+
+	switch (vpd->device_identifier_code_set) {
+	case 0x01: /* Binary */
+		sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
+			&vpd->device_identifier[0]);
+		break;
+	case 0x02: /* ASCII */
+		sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
+			&vpd->device_identifier[0]);
+		break;
+	case 0x03: /* UTF-8 */
+		sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
+			&vpd->device_identifier[0]);
+		break;
+	default:
+		sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
+			" 0x%02x", vpd->device_identifier_code_set);
+		ret = -1;
+		break;
+	}
+
+	if (p_buf)
+		strncpy(p_buf, buf, p_buf_len);
+	else
+		printk("%s", buf);
+
+	return ret;
+}
+
+int
+transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
+{
+	static const char hex_str[] = "0123456789abcdef";
+	int j = 0, i = 4; /* offset to start of the identifer */
+
+	/*
+	 * The VPD Code Set (encoding)
+	 *
+	 * from spc3r23.pdf Section 7.6.3.1 Table 296
+	 */
+	vpd->device_identifier_code_set = (page_83[0] & 0x0f);
+	switch (vpd->device_identifier_code_set) {
+	case 0x01: /* Binary */
+		vpd->device_identifier[j++] =
+				hex_str[vpd->device_identifier_type];
+		while (i < (4 + page_83[3])) {
+			vpd->device_identifier[j++] =
+				hex_str[(page_83[i] & 0xf0) >> 4];
+			vpd->device_identifier[j++] =
+				hex_str[page_83[i] & 0x0f];
+			i++;
+		}
+		break;
+	case 0x02: /* ASCII */
+	case 0x03: /* UTF-8 */
+		while (i < (4 + page_83[3]))
+			vpd->device_identifier[j++] = page_83[i++];
+		break;
+	default:
+		break;
+	}
+
+	return transport_dump_vpd_ident(vpd, NULL, 0);
+}
+EXPORT_SYMBOL(transport_set_vpd_ident);
+
+static void core_setup_task_attr_emulation(struct se_device *dev)
+{
+	/*
+	 * If this device is from Target_Core_Mod/pSCSI, disable the
+	 * SAM Task Attribute emulation.
+	 *
+	 * This is currently not available in upsream Linux/SCSI Target
+	 * mode code, and is assumed to be disabled while using TCM/pSCSI.
+	 */
+	if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
+		dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
+		return;
+	}
+
+	dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
+	DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
+		" device\n", TRANSPORT(dev)->name,
+		TRANSPORT(dev)->get_device_rev(dev));
+}
+
+static void scsi_dump_inquiry(struct se_device *dev)
+{
+	struct t10_wwn *wwn = DEV_T10_WWN(dev);
+	int i, device_type;
+	/*
+	 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
+	 */
+	printk("  Vendor: ");
+	for (i = 0; i < 8; i++)
+		if (wwn->vendor[i] >= 0x20)
+			printk("%c", wwn->vendor[i]);
+		else
+			printk(" ");
+
+	printk("  Model: ");
+	for (i = 0; i < 16; i++)
+		if (wwn->model[i] >= 0x20)
+			printk("%c", wwn->model[i]);
+		else
+			printk(" ");
+
+	printk("  Revision: ");
+	for (i = 0; i < 4; i++)
+		if (wwn->revision[i] >= 0x20)
+			printk("%c", wwn->revision[i]);
+		else
+			printk(" ");
+
+	printk("\n");
+
+	device_type = TRANSPORT(dev)->get_device_type(dev);
+	printk("  Type:   %s ", scsi_device_type(device_type));
+	printk("                 ANSI SCSI revision: %02x\n",
+				TRANSPORT(dev)->get_device_rev(dev));
+}
+
+struct se_device *transport_add_device_to_core_hba(
+	struct se_hba *hba,
+	struct se_subsystem_api *transport,
+	struct se_subsystem_dev *se_dev,
+	u32 device_flags,
+	void *transport_dev,
+	struct se_dev_limits *dev_limits,
+	const char *inquiry_prod,
+	const char *inquiry_rev)
+{
+	int ret = 0, force_pt;
+	struct se_device  *dev;
+
+	dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
+	if (!(dev)) {
+		printk(KERN_ERR "Unable to allocate memory for se_dev_t\n");
+		return NULL;
+	}
+	dev->dev_queue_obj = kzalloc(sizeof(struct se_queue_obj), GFP_KERNEL);
+	if (!(dev->dev_queue_obj)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+				" dev->dev_queue_obj\n");
+		kfree(dev);
+		return NULL;
+	}
+	transport_init_queue_obj(dev->dev_queue_obj);
+
+	dev->dev_status_queue_obj = kzalloc(sizeof(struct se_queue_obj),
+					GFP_KERNEL);
+	if (!(dev->dev_status_queue_obj)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+				" dev->dev_status_queue_obj\n");
+		kfree(dev->dev_queue_obj);
+		kfree(dev);
+		return NULL;
+	}
+	transport_init_queue_obj(dev->dev_status_queue_obj);
+
+	dev->dev_flags		= device_flags;
+	dev->dev_status		|= TRANSPORT_DEVICE_DEACTIVATED;
+	dev->dev_ptr		= (void *) transport_dev;
+	dev->se_hba		= hba;
+	dev->se_sub_dev		= se_dev;
+	dev->transport		= transport;
+	atomic_set(&dev->active_cmds, 0);
+	INIT_LIST_HEAD(&dev->dev_list);
+	INIT_LIST_HEAD(&dev->dev_sep_list);
+	INIT_LIST_HEAD(&dev->dev_tmr_list);
+	INIT_LIST_HEAD(&dev->execute_task_list);
+	INIT_LIST_HEAD(&dev->delayed_cmd_list);
+	INIT_LIST_HEAD(&dev->ordered_cmd_list);
+	INIT_LIST_HEAD(&dev->state_task_list);
+	spin_lock_init(&dev->execute_task_lock);
+	spin_lock_init(&dev->delayed_cmd_lock);
+	spin_lock_init(&dev->ordered_cmd_lock);
+	spin_lock_init(&dev->state_task_lock);
+	spin_lock_init(&dev->dev_alua_lock);
+	spin_lock_init(&dev->dev_reservation_lock);
+	spin_lock_init(&dev->dev_status_lock);
+	spin_lock_init(&dev->dev_status_thr_lock);
+	spin_lock_init(&dev->se_port_lock);
+	spin_lock_init(&dev->se_tmr_lock);
+
+	dev->queue_depth	= dev_limits->queue_depth;
+	atomic_set(&dev->depth_left, dev->queue_depth);
+	atomic_set(&dev->dev_ordered_id, 0);
+
+	se_dev_set_default_attribs(dev, dev_limits);
+
+	dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
+	dev->creation_time = get_jiffies_64();
+	spin_lock_init(&dev->stats_lock);
+
+	spin_lock(&hba->device_lock);
+	list_add_tail(&dev->dev_list, &hba->hba_dev_list);
+	hba->dev_count++;
+	spin_unlock(&hba->device_lock);
+	/*
+	 * Setup the SAM Task Attribute emulation for struct se_device
+	 */
+	core_setup_task_attr_emulation(dev);
+	/*
+	 * Force PR and ALUA passthrough emulation with internal object use.
+	 */
+	force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
+	/*
+	 * Setup the Reservations infrastructure for struct se_device
+	 */
+	core_setup_reservations(dev, force_pt);
+	/*
+	 * Setup the Asymmetric Logical Unit Assignment for struct se_device
+	 */
+	if (core_setup_alua(dev, force_pt) < 0)
+		goto out;
+
+	/*
+	 * Startup the struct se_device processing thread
+	 */
+	dev->process_thread = kthread_run(transport_processing_thread, dev,
+					  "LIO_%s", TRANSPORT(dev)->name);
+	if (IS_ERR(dev->process_thread)) {
+		printk(KERN_ERR "Unable to create kthread: LIO_%s\n",
+			TRANSPORT(dev)->name);
+		goto out;
+	}
+
+	/*
+	 * Preload the initial INQUIRY const values if we are doing
+	 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
+	 * passthrough because this is being provided by the backend LLD.
+	 * This is required so that transport_get_inquiry() copies these
+	 * originals once back into DEV_T10_WWN(dev) for the virtual device
+	 * setup.
+	 */
+	if (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
+		if (!(inquiry_prod) || !(inquiry_prod)) {
+			printk(KERN_ERR "All non TCM/pSCSI plugins require"
+				" INQUIRY consts\n");
+			goto out;
+		}
+
+		strncpy(&DEV_T10_WWN(dev)->vendor[0], "LIO-ORG", 8);
+		strncpy(&DEV_T10_WWN(dev)->model[0], inquiry_prod, 16);
+		strncpy(&DEV_T10_WWN(dev)->revision[0], inquiry_rev, 4);
+	}
+	scsi_dump_inquiry(dev);
+
+out:
+	if (!ret)
+		return dev;
+	kthread_stop(dev->process_thread);
+
+	spin_lock(&hba->device_lock);
+	list_del(&dev->dev_list);
+	hba->dev_count--;
+	spin_unlock(&hba->device_lock);
+
+	se_release_vpd_for_dev(dev);
+
+	kfree(dev->dev_status_queue_obj);
+	kfree(dev->dev_queue_obj);
+	kfree(dev);
+
+	return NULL;
+}
+EXPORT_SYMBOL(transport_add_device_to_core_hba);
+
+/*	transport_generic_prepare_cdb():
+ *
+ *	Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
+ *	contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
+ *	The point of this is since we are mapping iSCSI LUNs to
+ *	SCSI Target IDs having a non-zero LUN in the CDB will throw the
+ *	devices and HBAs for a loop.
+ */
+static inline void transport_generic_prepare_cdb(
+	unsigned char *cdb)
+{
+	switch (cdb[0]) {
+	case READ_10: /* SBC - RDProtect */
+	case READ_12: /* SBC - RDProtect */
+	case READ_16: /* SBC - RDProtect */
+	case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
+	case VERIFY: /* SBC - VRProtect */
+	case VERIFY_16: /* SBC - VRProtect */
+	case WRITE_VERIFY: /* SBC - VRProtect */
+	case WRITE_VERIFY_12: /* SBC - VRProtect */
+		break;
+	default:
+		cdb[1] &= 0x1f; /* clear logical unit number */
+		break;
+	}
+}
+
+static struct se_task *
+transport_generic_get_task(struct se_cmd *cmd,
+		enum dma_data_direction data_direction)
+{
+	struct se_task *task;
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned long flags;
+
+	task = dev->transport->alloc_task(cmd);
+	if (!task) {
+		printk(KERN_ERR "Unable to allocate struct se_task\n");
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&task->t_list);
+	INIT_LIST_HEAD(&task->t_execute_list);
+	INIT_LIST_HEAD(&task->t_state_list);
+	init_completion(&task->task_stop_comp);
+	task->task_no = T_TASK(cmd)->t_tasks_no++;
+	task->task_se_cmd = cmd;
+	task->se_dev = dev;
+	task->task_data_direction = data_direction;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	list_add_tail(&task->t_list, &T_TASK(cmd)->t_task_list);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	return task;
+}
+
+static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
+
+void transport_device_setup_cmd(struct se_cmd *cmd)
+{
+	cmd->se_dev = SE_LUN(cmd)->lun_se_dev;
+}
+EXPORT_SYMBOL(transport_device_setup_cmd);
+
+/*
+ * Used by fabric modules containing a local struct se_cmd within their
+ * fabric dependent per I/O descriptor.
+ */
+void transport_init_se_cmd(
+	struct se_cmd *cmd,
+	struct target_core_fabric_ops *tfo,
+	struct se_session *se_sess,
+	u32 data_length,
+	int data_direction,
+	int task_attr,
+	unsigned char *sense_buffer)
+{
+	INIT_LIST_HEAD(&cmd->se_lun_list);
+	INIT_LIST_HEAD(&cmd->se_delayed_list);
+	INIT_LIST_HEAD(&cmd->se_ordered_list);
+	/*
+	 * Setup t_task pointer to t_task_backstore
+	 */
+	cmd->t_task = &cmd->t_task_backstore;
+
+	INIT_LIST_HEAD(&T_TASK(cmd)->t_task_list);
+	init_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
+	init_completion(&T_TASK(cmd)->transport_lun_stop_comp);
+	init_completion(&T_TASK(cmd)->t_transport_stop_comp);
+	spin_lock_init(&T_TASK(cmd)->t_state_lock);
+	atomic_set(&T_TASK(cmd)->transport_dev_active, 1);
+
+	cmd->se_tfo = tfo;
+	cmd->se_sess = se_sess;
+	cmd->data_length = data_length;
+	cmd->data_direction = data_direction;
+	cmd->sam_task_attr = task_attr;
+	cmd->sense_buffer = sense_buffer;
+}
+EXPORT_SYMBOL(transport_init_se_cmd);
+
+static int transport_check_alloc_task_attr(struct se_cmd *cmd)
+{
+	/*
+	 * Check if SAM Task Attribute emulation is enabled for this
+	 * struct se_device storage object
+	 */
+	if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
+		return 0;
+
+	if (cmd->sam_task_attr == TASK_ATTR_ACA) {
+		DEBUG_STA("SAM Task Attribute ACA"
+			" emulation is not supported\n");
+		return -1;
+	}
+	/*
+	 * Used to determine when ORDERED commands should go from
+	 * Dormant to Active status.
+	 */
+	cmd->se_ordered_id = atomic_inc_return(&SE_DEV(cmd)->dev_ordered_id);
+	smp_mb__after_atomic_inc();
+	DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
+			cmd->se_ordered_id, cmd->sam_task_attr,
+			TRANSPORT(cmd->se_dev)->name);
+	return 0;
+}
+
+void transport_free_se_cmd(
+	struct se_cmd *se_cmd)
+{
+	if (se_cmd->se_tmr_req)
+		core_tmr_release_req(se_cmd->se_tmr_req);
+	/*
+	 * Check and free any extended CDB buffer that was allocated
+	 */
+	if (T_TASK(se_cmd)->t_task_cdb != T_TASK(se_cmd)->__t_task_cdb)
+		kfree(T_TASK(se_cmd)->t_task_cdb);
+}
+EXPORT_SYMBOL(transport_free_se_cmd);
+
+static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
+
+/*	transport_generic_allocate_tasks():
+ *
+ *	Called from fabric RX Thread.
+ */
+int transport_generic_allocate_tasks(
+	struct se_cmd *cmd,
+	unsigned char *cdb)
+{
+	int ret;
+
+	transport_generic_prepare_cdb(cdb);
+
+	/*
+	 * This is needed for early exceptions.
+	 */
+	cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
+
+	transport_device_setup_cmd(cmd);
+	/*
+	 * Ensure that the received CDB is less than the max (252 + 8) bytes
+	 * for VARIABLE_LENGTH_CMD
+	 */
+	if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
+		printk(KERN_ERR "Received SCSI CDB with command_size: %d that"
+			" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
+			scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
+		return -1;
+	}
+	/*
+	 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
+	 * allocate the additional extended CDB buffer now..  Otherwise
+	 * setup the pointer from __t_task_cdb to t_task_cdb.
+	 */
+	if (scsi_command_size(cdb) > sizeof(T_TASK(cmd)->__t_task_cdb)) {
+		T_TASK(cmd)->t_task_cdb = kzalloc(scsi_command_size(cdb),
+						GFP_KERNEL);
+		if (!(T_TASK(cmd)->t_task_cdb)) {
+			printk(KERN_ERR "Unable to allocate T_TASK(cmd)->t_task_cdb"
+				" %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n",
+				scsi_command_size(cdb),
+				(unsigned long)sizeof(T_TASK(cmd)->__t_task_cdb));
+			return -1;
+		}
+	} else
+		T_TASK(cmd)->t_task_cdb = &T_TASK(cmd)->__t_task_cdb[0];
+	/*
+	 * Copy the original CDB into T_TASK(cmd).
+	 */
+	memcpy(T_TASK(cmd)->t_task_cdb, cdb, scsi_command_size(cdb));
+	/*
+	 * Setup the received CDB based on SCSI defined opcodes and
+	 * perform unit attention, persistent reservations and ALUA
+	 * checks for virtual device backends.  The T_TASK(cmd)->t_task_cdb
+	 * pointer is expected to be setup before we reach this point.
+	 */
+	ret = transport_generic_cmd_sequencer(cmd, cdb);
+	if (ret < 0)
+		return ret;
+	/*
+	 * Check for SAM Task Attribute Emulation
+	 */
+	if (transport_check_alloc_task_attr(cmd) < 0) {
+		cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+		cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+		return -2;
+	}
+	spin_lock(&cmd->se_lun->lun_sep_lock);
+	if (cmd->se_lun->lun_sep)
+		cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
+	spin_unlock(&cmd->se_lun->lun_sep_lock);
+	return 0;
+}
+EXPORT_SYMBOL(transport_generic_allocate_tasks);
+
+/*
+ * Used by fabric module frontends not defining a TFO->new_cmd_map()
+ * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
+ */
+int transport_generic_handle_cdb(
+	struct se_cmd *cmd)
+{
+	if (!SE_LUN(cmd)) {
+		dump_stack();
+		printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
+		return -1;
+	}
+
+	transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
+	return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_cdb);
+
+/*
+ * Used by fabric module frontends defining a TFO->new_cmd_map() caller
+ * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
+ * complete setup in TCM process context w/ TFO->new_cmd_map().
+ */
+int transport_generic_handle_cdb_map(
+	struct se_cmd *cmd)
+{
+	if (!SE_LUN(cmd)) {
+		dump_stack();
+		printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
+		return -1;
+	}
+
+	transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
+	return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_cdb_map);
+
+/*	transport_generic_handle_data():
+ *
+ *
+ */
+int transport_generic_handle_data(
+	struct se_cmd *cmd)
+{
+	/*
+	 * For the software fabric case, then we assume the nexus is being
+	 * failed/shutdown when signals are pending from the kthread context
+	 * caller, so we return a failure.  For the HW target mode case running
+	 * in interrupt code, the signal_pending() check is skipped.
+	 */
+	if (!in_interrupt() && signal_pending(current))
+		return -1;
+	/*
+	 * If the received CDB has aleady been ABORTED by the generic
+	 * target engine, we now call transport_check_aborted_status()
+	 * to queue any delated TASK_ABORTED status for the received CDB to the
+	 * fabric module as we are expecting no futher incoming DATA OUT
+	 * sequences at this point.
+	 */
+	if (transport_check_aborted_status(cmd, 1) != 0)
+		return 0;
+
+	transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
+	return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_data);
+
+/*	transport_generic_handle_tmr():
+ *
+ *
+ */
+int transport_generic_handle_tmr(
+	struct se_cmd *cmd)
+{
+	/*
+	 * This is needed for early exceptions.
+	 */
+	cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
+	transport_device_setup_cmd(cmd);
+
+	transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
+	return 0;
+}
+EXPORT_SYMBOL(transport_generic_handle_tmr);
+
+static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
+{
+	struct se_task *task, *task_tmp;
+	unsigned long flags;
+	int ret = 0;
+
+	DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
+		CMD_TFO(cmd)->get_task_tag(cmd));
+
+	/*
+	 * No tasks remain in the execution queue
+	 */
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	list_for_each_entry_safe(task, task_tmp,
+				&T_TASK(cmd)->t_task_list, t_list) {
+		DEBUG_TS("task_no[%d] - Processing task %p\n",
+				task->task_no, task);
+		/*
+		 * If the struct se_task has not been sent and is not active,
+		 * remove the struct se_task from the execution queue.
+		 */
+		if (!atomic_read(&task->task_sent) &&
+		    !atomic_read(&task->task_active)) {
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+					flags);
+			transport_remove_task_from_execute_queue(task,
+					task->se_dev);
+
+			DEBUG_TS("task_no[%d] - Removed from execute queue\n",
+				task->task_no);
+			spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+			continue;
+		}
+
+		/*
+		 * If the struct se_task is active, sleep until it is returned
+		 * from the plugin.
+		 */
+		if (atomic_read(&task->task_active)) {
+			atomic_set(&task->task_stop, 1);
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+					flags);
+
+			DEBUG_TS("task_no[%d] - Waiting to complete\n",
+				task->task_no);
+			wait_for_completion(&task->task_stop_comp);
+			DEBUG_TS("task_no[%d] - Stopped successfully\n",
+				task->task_no);
+
+			spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+			atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
+
+			atomic_set(&task->task_active, 0);
+			atomic_set(&task->task_stop, 0);
+		} else {
+			DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no);
+			ret++;
+		}
+
+		__transport_stop_task_timer(task, &flags);
+	}
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	return ret;
+}
+
+static void transport_failure_reset_queue_depth(struct se_device *dev)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);;
+	atomic_inc(&dev->depth_left);
+	atomic_inc(&SE_HBA(dev)->left_queue_depth);
+	spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+}
+
+/*
+ * Handle SAM-esque emulation for generic transport request failures.
+ */
+static void transport_generic_request_failure(
+	struct se_cmd *cmd,
+	struct se_device *dev,
+	int complete,
+	int sc)
+{
+	DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
+		" CDB: 0x%02x\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
+		T_TASK(cmd)->t_task_cdb[0]);
+	DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
+		" %d/%d transport_error_status: %d\n",
+		CMD_TFO(cmd)->get_cmd_state(cmd),
+		cmd->t_state, cmd->deferred_t_state,
+		cmd->transport_error_status);
+	DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
+		" t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
+		" t_transport_active: %d t_transport_stop: %d"
+		" t_transport_sent: %d\n", T_TASK(cmd)->t_task_cdbs,
+		atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
+		atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
+		atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left),
+		atomic_read(&T_TASK(cmd)->t_transport_active),
+		atomic_read(&T_TASK(cmd)->t_transport_stop),
+		atomic_read(&T_TASK(cmd)->t_transport_sent));
+
+	transport_stop_all_task_timers(cmd);
+
+	if (dev)
+		transport_failure_reset_queue_depth(dev);
+	/*
+	 * For SAM Task Attribute emulation for failed struct se_cmd
+	 */
+	if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+		transport_complete_task_attr(cmd);
+
+	if (complete) {
+		transport_direct_request_timeout(cmd);
+		cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
+	}
+
+	switch (cmd->transport_error_status) {
+	case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
+		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+		break;
+	case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
+		cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
+		break;
+	case PYX_TRANSPORT_INVALID_CDB_FIELD:
+		cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+		break;
+	case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
+		cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
+		break;
+	case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
+		if (!sc)
+			transport_new_cmd_failure(cmd);
+		/*
+		 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
+		 * we force this session to fall back to session
+		 * recovery.
+		 */
+		CMD_TFO(cmd)->fall_back_to_erl0(cmd->se_sess);
+		CMD_TFO(cmd)->stop_session(cmd->se_sess, 0, 0);
+
+		goto check_stop;
+	case PYX_TRANSPORT_LU_COMM_FAILURE:
+	case PYX_TRANSPORT_ILLEGAL_REQUEST:
+		cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+		break;
+	case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
+		cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
+		break;
+	case PYX_TRANSPORT_WRITE_PROTECTED:
+		cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
+		break;
+	case PYX_TRANSPORT_RESERVATION_CONFLICT:
+		/*
+		 * No SENSE Data payload for this case, set SCSI Status
+		 * and queue the response to $FABRIC_MOD.
+		 *
+		 * Uses linux/include/scsi/scsi.h SAM status codes defs
+		 */
+		cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
+		/*
+		 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
+		 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
+		 * CONFLICT STATUS.
+		 *
+		 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
+		 */
+		if (SE_SESS(cmd) &&
+		    DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
+			core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
+				cmd->orig_fe_lun, 0x2C,
+				ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
+
+		CMD_TFO(cmd)->queue_status(cmd);
+		goto check_stop;
+	case PYX_TRANSPORT_USE_SENSE_REASON:
+		/*
+		 * struct se_cmd->scsi_sense_reason already set
+		 */
+		break;
+	default:
+		printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n",
+			T_TASK(cmd)->t_task_cdb[0],
+			cmd->transport_error_status);
+		cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+		break;
+	}
+
+	if (!sc)
+		transport_new_cmd_failure(cmd);
+	else
+		transport_send_check_condition_and_sense(cmd,
+			cmd->scsi_sense_reason, 0);
+check_stop:
+	transport_lun_remove_cmd(cmd);
+	if (!(transport_cmd_check_stop_to_fabric(cmd)))
+		;
+}
+
+static void transport_direct_request_timeout(struct se_cmd *cmd)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (!(atomic_read(&T_TASK(cmd)->t_transport_timeout))) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return;
+	}
+	if (atomic_read(&T_TASK(cmd)->t_task_cdbs_timeout_left)) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return;
+	}
+
+	atomic_sub(atomic_read(&T_TASK(cmd)->t_transport_timeout),
+		   &T_TASK(cmd)->t_se_count);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static void transport_generic_request_timeout(struct se_cmd *cmd)
+{
+	unsigned long flags;
+
+	/*
+	 * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove()
+	 * to allow last call to free memory resources.
+	 */
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (atomic_read(&T_TASK(cmd)->t_transport_timeout) > 1) {
+		int tmp = (atomic_read(&T_TASK(cmd)->t_transport_timeout) - 1);
+
+		atomic_sub(tmp, &T_TASK(cmd)->t_se_count);
+	}
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	transport_generic_remove(cmd, 0, 0);
+}
+
+static int
+transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length)
+{
+	unsigned char *buf;
+
+	buf = kzalloc(data_length, GFP_KERNEL);
+	if (!(buf)) {
+		printk(KERN_ERR "Unable to allocate memory for buffer\n");
+		return -1;
+	}
+
+	T_TASK(cmd)->t_tasks_se_num = 0;
+	T_TASK(cmd)->t_task_buf = buf;
+
+	return 0;
+}
+
+static inline u32 transport_lba_21(unsigned char *cdb)
+{
+	return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
+}
+
+static inline u32 transport_lba_32(unsigned char *cdb)
+{
+	return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+}
+
+static inline unsigned long long transport_lba_64(unsigned char *cdb)
+{
+	unsigned int __v1, __v2;
+
+	__v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+	__v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+
+	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+/*
+ * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
+ */
+static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
+{
+	unsigned int __v1, __v2;
+
+	__v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
+	__v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
+
+	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+}
+
+static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
+	se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
+	spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
+}
+
+/*
+ * Called from interrupt context.
+ */
+static void transport_task_timeout_handler(unsigned long data)
+{
+	struct se_task *task = (struct se_task *)data;
+	struct se_cmd *cmd = TASK_CMD(task);
+	unsigned long flags;
+
+	DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (task->task_flags & TF_STOP) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return;
+	}
+	task->task_flags &= ~TF_RUNNING;
+
+	/*
+	 * Determine if transport_complete_task() has already been called.
+	 */
+	if (!(atomic_read(&task->task_active))) {
+		DEBUG_TT("transport task: %p cmd: %p timeout task_active"
+				" == 0\n", task, cmd);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return;
+	}
+
+	atomic_inc(&T_TASK(cmd)->t_se_count);
+	atomic_inc(&T_TASK(cmd)->t_transport_timeout);
+	T_TASK(cmd)->t_tasks_failed = 1;
+
+	atomic_set(&task->task_timeout, 1);
+	task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
+	task->task_scsi_status = 1;
+
+	if (atomic_read(&task->task_stop)) {
+		DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
+				" == 1\n", task, cmd);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		complete(&task->task_stop_comp);
+		return;
+	}
+
+	if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) {
+		DEBUG_TT("transport task: %p cmd: %p timeout non zero"
+				" t_task_cdbs_left\n", task, cmd);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return;
+	}
+	DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
+			task, cmd);
+
+	cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
+}
+
+/*
+ * Called with T_TASK(cmd)->t_state_lock held.
+ */
+static void transport_start_task_timer(struct se_task *task)
+{
+	struct se_device *dev = task->se_dev;
+	int timeout;
+
+	if (task->task_flags & TF_RUNNING)
+		return;
+	/*
+	 * If the task_timeout is disabled, exit now.
+	 */
+	timeout = DEV_ATTRIB(dev)->task_timeout;
+	if (!(timeout))
+		return;
+
+	init_timer(&task->task_timer);
+	task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
+	task->task_timer.data = (unsigned long) task;
+	task->task_timer.function = transport_task_timeout_handler;
+
+	task->task_flags |= TF_RUNNING;
+	add_timer(&task->task_timer);
+#if 0
+	printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:"
+		" %d\n", task->task_se_cmd, task, timeout);
+#endif
+}
+
+/*
+ * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held.
+ */
+void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
+{
+	struct se_cmd *cmd = TASK_CMD(task);
+
+	if (!(task->task_flags & TF_RUNNING))
+		return;
+
+	task->task_flags |= TF_STOP;
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, *flags);
+
+	del_timer_sync(&task->task_timer);
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, *flags);
+	task->task_flags &= ~TF_RUNNING;
+	task->task_flags &= ~TF_STOP;
+}
+
+static void transport_stop_all_task_timers(struct se_cmd *cmd)
+{
+	struct se_task *task = NULL, *task_tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	list_for_each_entry_safe(task, task_tmp,
+				&T_TASK(cmd)->t_task_list, t_list)
+		__transport_stop_task_timer(task, &flags);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static inline int transport_tcq_window_closed(struct se_device *dev)
+{
+	if (dev->dev_tcq_window_closed++ <
+			PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
+		msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
+	} else
+		msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
+
+	wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
+	return 0;
+}
+
+/*
+ * Called from Fabric Module context from transport_execute_tasks()
+ *
+ * The return of this function determins if the tasks from struct se_cmd
+ * get added to the execution queue in transport_execute_tasks(),
+ * or are added to the delayed or ordered lists here.
+ */
+static inline int transport_execute_task_attr(struct se_cmd *cmd)
+{
+	if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
+		return 1;
+	/*
+	 * Check for the existance of HEAD_OF_QUEUE, and if true return 1
+	 * to allow the passed struct se_cmd list of tasks to the front of the list.
+	 */
+	 if (cmd->sam_task_attr == TASK_ATTR_HOQ) {
+		atomic_inc(&SE_DEV(cmd)->dev_hoq_count);
+		smp_mb__after_atomic_inc();
+		DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
+			" 0x%02x, se_ordered_id: %u\n",
+			T_TASK(cmd)->t_task_cdb[0],
+			cmd->se_ordered_id);
+		return 1;
+	} else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) {
+		spin_lock(&SE_DEV(cmd)->ordered_cmd_lock);
+		list_add_tail(&cmd->se_ordered_list,
+				&SE_DEV(cmd)->ordered_cmd_list);
+		spin_unlock(&SE_DEV(cmd)->ordered_cmd_lock);
+
+		atomic_inc(&SE_DEV(cmd)->dev_ordered_sync);
+		smp_mb__after_atomic_inc();
+
+		DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
+				" list, se_ordered_id: %u\n",
+				T_TASK(cmd)->t_task_cdb[0],
+				cmd->se_ordered_id);
+		/*
+		 * Add ORDERED command to tail of execution queue if
+		 * no other older commands exist that need to be
+		 * completed first.
+		 */
+		if (!(atomic_read(&SE_DEV(cmd)->simple_cmds)))
+			return 1;
+	} else {
+		/*
+		 * For SIMPLE and UNTAGGED Task Attribute commands
+		 */
+		atomic_inc(&SE_DEV(cmd)->simple_cmds);
+		smp_mb__after_atomic_inc();
+	}
+	/*
+	 * Otherwise if one or more outstanding ORDERED task attribute exist,
+	 * add the dormant task(s) built for the passed struct se_cmd to the
+	 * execution queue and become in Active state for this struct se_device.
+	 */
+	if (atomic_read(&SE_DEV(cmd)->dev_ordered_sync) != 0) {
+		/*
+		 * Otherwise, add cmd w/ tasks to delayed cmd queue that
+		 * will be drained upon competion of HEAD_OF_QUEUE task.
+		 */
+		spin_lock(&SE_DEV(cmd)->delayed_cmd_lock);
+		cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
+		list_add_tail(&cmd->se_delayed_list,
+				&SE_DEV(cmd)->delayed_cmd_list);
+		spin_unlock(&SE_DEV(cmd)->delayed_cmd_lock);
+
+		DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
+			" delayed CMD list, se_ordered_id: %u\n",
+			T_TASK(cmd)->t_task_cdb[0], cmd->sam_task_attr,
+			cmd->se_ordered_id);
+		/*
+		 * Return zero to let transport_execute_tasks() know
+		 * not to add the delayed tasks to the execution list.
+		 */
+		return 0;
+	}
+	/*
+	 * Otherwise, no ORDERED task attributes exist..
+	 */
+	return 1;
+}
+
+/*
+ * Called from fabric module context in transport_generic_new_cmd() and
+ * transport_generic_process_write()
+ */
+static int transport_execute_tasks(struct se_cmd *cmd)
+{
+	int add_tasks;
+
+	if (!(cmd->se_cmd_flags & SCF_SE_DISABLE_ONLINE_CHECK)) {
+		if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
+			cmd->transport_error_status =
+				PYX_TRANSPORT_LU_COMM_FAILURE;
+			transport_generic_request_failure(cmd, NULL, 0, 1);
+			return 0;
+		}
+	}
+	/*
+	 * Call transport_cmd_check_stop() to see if a fabric exception
+	 * has occured that prevents execution.
+	 */
+	if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) {
+		/*
+		 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
+		 * attribute for the tasks of the received struct se_cmd CDB
+		 */
+		add_tasks = transport_execute_task_attr(cmd);
+		if (add_tasks == 0)
+			goto execute_tasks;
+		/*
+		 * This calls transport_add_tasks_from_cmd() to handle
+		 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
+		 * (if enabled) in __transport_add_task_to_execute_queue() and
+		 * transport_add_task_check_sam_attr().
+		 */
+		transport_add_tasks_from_cmd(cmd);
+	}
+	/*
+	 * Kick the execution queue for the cmd associated struct se_device
+	 * storage object.
+	 */
+execute_tasks:
+	__transport_execute_tasks(SE_DEV(cmd));
+	return 0;
+}
+
+/*
+ * Called to check struct se_device tcq depth window, and once open pull struct se_task
+ * from struct se_device->execute_task_list and
+ *
+ * Called from transport_processing_thread()
+ */
+static int __transport_execute_tasks(struct se_device *dev)
+{
+	int error;
+	struct se_cmd *cmd = NULL;
+	struct se_task *task;
+	unsigned long flags;
+
+	/*
+	 * Check if there is enough room in the device and HBA queue to send
+	 * struct se_transport_task's to the selected transport.
+	 */
+check_depth:
+	spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags);
+	if (!(atomic_read(&dev->depth_left)) ||
+	    !(atomic_read(&SE_HBA(dev)->left_queue_depth))) {
+		spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+		return transport_tcq_window_closed(dev);
+	}
+	dev->dev_tcq_window_closed = 0;
+
+	spin_lock(&dev->execute_task_lock);
+	task = transport_get_task_from_execute_queue(dev);
+	spin_unlock(&dev->execute_task_lock);
+
+	if (!task) {
+		spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+		return 0;
+	}
+
+	atomic_dec(&dev->depth_left);
+	atomic_dec(&SE_HBA(dev)->left_queue_depth);
+	spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags);
+
+	cmd = TASK_CMD(task);
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	atomic_set(&task->task_active, 1);
+	atomic_set(&task->task_sent, 1);
+	atomic_inc(&T_TASK(cmd)->t_task_cdbs_sent);
+
+	if (atomic_read(&T_TASK(cmd)->t_task_cdbs_sent) ==
+	    T_TASK(cmd)->t_task_cdbs)
+		atomic_set(&cmd->transport_sent, 1);
+
+	transport_start_task_timer(task);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+	/*
+	 * The struct se_cmd->transport_emulate_cdb() function pointer is used
+	 * to grab REPORT_LUNS CDBs before they hit the
+	 * struct se_subsystem_api->do_task() caller below.
+	 */
+	if (cmd->transport_emulate_cdb) {
+		error = cmd->transport_emulate_cdb(cmd);
+		if (error != 0) {
+			cmd->transport_error_status = error;
+			atomic_set(&task->task_active, 0);
+			atomic_set(&cmd->transport_sent, 0);
+			transport_stop_tasks_for_cmd(cmd);
+			transport_generic_request_failure(cmd, dev, 0, 1);
+			goto check_depth;
+		}
+		/*
+		 * Handle the successful completion for transport_emulate_cdb()
+		 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
+		 * Otherwise the caller is expected to complete the task with
+		 * proper status.
+		 */
+		if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
+			cmd->scsi_status = SAM_STAT_GOOD;
+			task->task_scsi_status = GOOD;
+			transport_complete_task(task, 1);
+		}
+	} else {
+		/*
+		 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
+		 * RAMDISK we use the internal transport_emulate_control_cdb() logic
+		 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
+		 * LUN emulation code.
+		 *
+		 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
+		 * call ->do_task() directly and let the underlying TCM subsystem plugin
+		 * code handle the CDB emulation.
+		 */
+		if ((TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
+		    (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
+			error = transport_emulate_control_cdb(task);
+		else
+			error = TRANSPORT(dev)->do_task(task);
+
+		if (error != 0) {
+			cmd->transport_error_status = error;
+			atomic_set(&task->task_active, 0);
+			atomic_set(&cmd->transport_sent, 0);
+			transport_stop_tasks_for_cmd(cmd);
+			transport_generic_request_failure(cmd, dev, 0, 1);
+		}
+	}
+
+	goto check_depth;
+
+	return 0;
+}
+
+void transport_new_cmd_failure(struct se_cmd *se_cmd)
+{
+	unsigned long flags;
+	/*
+	 * Any unsolicited data will get dumped for failed command inside of
+	 * the fabric plugin
+	 */
+	spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags);
+	se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
+	se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+	spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags);
+
+	CMD_TFO(se_cmd)->new_cmd_failure(se_cmd);
+}
+
+static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
+
+static inline u32 transport_get_sectors_6(
+	unsigned char *cdb,
+	struct se_cmd *cmd,
+	int *ret)
+{
+	struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+	/*
+	 * Assume TYPE_DISK for non struct se_device objects.
+	 * Use 8-bit sector value.
+	 */
+	if (!dev)
+		goto type_disk;
+
+	/*
+	 * Use 24-bit allocation length for TYPE_TAPE.
+	 */
+	if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
+		return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
+
+	/*
+	 * Everything else assume TYPE_DISK Sector CDB location.
+	 * Use 8-bit sector value.
+	 */
+type_disk:
+	return (u32)cdb[4];
+}
+
+static inline u32 transport_get_sectors_10(
+	unsigned char *cdb,
+	struct se_cmd *cmd,
+	int *ret)
+{
+	struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+	/*
+	 * Assume TYPE_DISK for non struct se_device objects.
+	 * Use 16-bit sector value.
+	 */
+	if (!dev)
+		goto type_disk;
+
+	/*
+	 * XXX_10 is not defined in SSC, throw an exception
+	 */
+	if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
+		*ret = -1;
+		return 0;
+	}
+
+	/*
+	 * Everything else assume TYPE_DISK Sector CDB location.
+	 * Use 16-bit sector value.
+	 */
+type_disk:
+	return (u32)(cdb[7] << 8) + cdb[8];
+}
+
+static inline u32 transport_get_sectors_12(
+	unsigned char *cdb,
+	struct se_cmd *cmd,
+	int *ret)
+{
+	struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+	/*
+	 * Assume TYPE_DISK for non struct se_device objects.
+	 * Use 32-bit sector value.
+	 */
+	if (!dev)
+		goto type_disk;
+
+	/*
+	 * XXX_12 is not defined in SSC, throw an exception
+	 */
+	if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
+		*ret = -1;
+		return 0;
+	}
+
+	/*
+	 * Everything else assume TYPE_DISK Sector CDB location.
+	 * Use 32-bit sector value.
+	 */
+type_disk:
+	return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
+}
+
+static inline u32 transport_get_sectors_16(
+	unsigned char *cdb,
+	struct se_cmd *cmd,
+	int *ret)
+{
+	struct se_device *dev = SE_LUN(cmd)->lun_se_dev;
+
+	/*
+	 * Assume TYPE_DISK for non struct se_device objects.
+	 * Use 32-bit sector value.
+	 */
+	if (!dev)
+		goto type_disk;
+
+	/*
+	 * Use 24-bit allocation length for TYPE_TAPE.
+	 */
+	if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE)
+		return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
+
+type_disk:
+	return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
+		    (cdb[12] << 8) + cdb[13];
+}
+
+/*
+ * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
+ */
+static inline u32 transport_get_sectors_32(
+	unsigned char *cdb,
+	struct se_cmd *cmd,
+	int *ret)
+{
+	/*
+	 * Assume TYPE_DISK for non struct se_device objects.
+	 * Use 32-bit sector value.
+	 */
+	return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
+		    (cdb[30] << 8) + cdb[31];
+
+}
+
+static inline u32 transport_get_size(
+	u32 sectors,
+	unsigned char *cdb,
+	struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+
+	if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) {
+		if (cdb[1] & 1) { /* sectors */
+			return DEV_ATTRIB(dev)->block_size * sectors;
+		} else /* bytes */
+			return sectors;
+	}
+#if 0
+	printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for"
+			" %s object\n", DEV_ATTRIB(dev)->block_size, sectors,
+			DEV_ATTRIB(dev)->block_size * sectors,
+			TRANSPORT(dev)->name);
+#endif
+	return DEV_ATTRIB(dev)->block_size * sectors;
+}
+
+unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
+{
+	unsigned char result = 0;
+	/*
+	 * MSB
+	 */
+	if ((val[0] >= 'a') && (val[0] <= 'f'))
+		result = ((val[0] - 'a' + 10) & 0xf) << 4;
+	else
+		if ((val[0] >= 'A') && (val[0] <= 'F'))
+			result = ((val[0] - 'A' + 10) & 0xf) << 4;
+		else /* digit */
+			result = ((val[0] - '0') & 0xf) << 4;
+	/*
+	 * LSB
+	 */
+	if ((val[1] >= 'a') && (val[1] <= 'f'))
+		result |= ((val[1] - 'a' + 10) & 0xf);
+	else
+		if ((val[1] >= 'A') && (val[1] <= 'F'))
+			result |= ((val[1] - 'A' + 10) & 0xf);
+		else /* digit */
+			result |= ((val[1] - '0') & 0xf);
+
+	return result;
+}
+EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
+
+static void transport_xor_callback(struct se_cmd *cmd)
+{
+	unsigned char *buf, *addr;
+	struct se_mem *se_mem;
+	unsigned int offset;
+	int i;
+	/*
+	 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
+	 *
+	 * 1) read the specified logical block(s);
+	 * 2) transfer logical blocks from the data-out buffer;
+	 * 3) XOR the logical blocks transferred from the data-out buffer with
+	 *    the logical blocks read, storing the resulting XOR data in a buffer;
+	 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
+	 *    blocks transferred from the data-out buffer; and
+	 * 5) transfer the resulting XOR data to the data-in buffer.
+	 */
+	buf = kmalloc(cmd->data_length, GFP_KERNEL);
+	if (!(buf)) {
+		printk(KERN_ERR "Unable to allocate xor_callback buf\n");
+		return;
+	}
+	/*
+	 * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list
+	 * into the locally allocated *buf
+	 */
+	transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list);
+	/*
+	 * Now perform the XOR against the BIDI read memory located at
+	 * T_TASK(cmd)->t_mem_bidi_list
+	 */
+
+	offset = 0;
+	list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) {
+		addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
+		if (!(addr))
+			goto out;
+
+		for (i = 0; i < se_mem->se_len; i++)
+			*(addr + se_mem->se_off + i) ^= *(buf + offset + i);
+
+		offset += se_mem->se_len;
+		kunmap_atomic(addr, KM_USER0);
+	}
+out:
+	kfree(buf);
+}
+
+/*
+ * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
+ */
+static int transport_get_sense_data(struct se_cmd *cmd)
+{
+	unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
+	struct se_device *dev;
+	struct se_task *task = NULL, *task_tmp;
+	unsigned long flags;
+	u32 offset = 0;
+
+	if (!SE_LUN(cmd)) {
+		printk(KERN_ERR "SE_LUN(cmd) is NULL\n");
+		return -1;
+	}
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return 0;
+	}
+
+	list_for_each_entry_safe(task, task_tmp,
+				&T_TASK(cmd)->t_task_list, t_list) {
+
+		if (!task->task_sense)
+			continue;
+
+		dev = task->se_dev;
+		if (!(dev))
+			continue;
+
+		if (!TRANSPORT(dev)->get_sense_buffer) {
+			printk(KERN_ERR "TRANSPORT(dev)->get_sense_buffer"
+					" is NULL\n");
+			continue;
+		}
+
+		sense_buffer = TRANSPORT(dev)->get_sense_buffer(task);
+		if (!(sense_buffer)) {
+			printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate"
+				" sense buffer for task with sense\n",
+				CMD_TFO(cmd)->get_task_tag(cmd), task->task_no);
+			continue;
+		}
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+		offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
+				TRANSPORT_SENSE_BUFFER);
+
+		memcpy((void *)&buffer[offset], (void *)sense_buffer,
+				TRANSPORT_SENSE_BUFFER);
+		cmd->scsi_status = task->task_scsi_status;
+		/* Automatically padded */
+		cmd->scsi_sense_length =
+				(TRANSPORT_SENSE_BUFFER + offset);
+
+		printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
+				" and sense\n",
+			dev->se_hba->hba_id, TRANSPORT(dev)->name,
+				cmd->scsi_status);
+		return 0;
+	}
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	return -1;
+}
+
+static int transport_allocate_resources(struct se_cmd *cmd)
+{
+	u32 length = cmd->data_length;
+
+	if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
+	    (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB))
+		return transport_generic_get_mem(cmd, length, PAGE_SIZE);
+	else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB)
+		return transport_generic_allocate_buf(cmd, length);
+	else
+		return 0;
+}
+
+static int
+transport_handle_reservation_conflict(struct se_cmd *cmd)
+{
+	cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
+	cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+	cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
+	cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
+	/*
+	 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
+	 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
+	 * CONFLICT STATUS.
+	 *
+	 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
+	 */
+	if (SE_SESS(cmd) &&
+	    DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
+		core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
+			cmd->orig_fe_lun, 0x2C,
+			ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
+	return -2;
+}
+
+/*	transport_generic_cmd_sequencer():
+ *
+ *	Generic Command Sequencer that should work for most DAS transport
+ *	drivers.
+ *
+ *	Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
+ *	RX Thread.
+ *
+ *	FIXME: Need to support other SCSI OPCODES where as well.
+ */
+static int transport_generic_cmd_sequencer(
+	struct se_cmd *cmd,
+	unsigned char *cdb)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
+	int ret = 0, sector_ret = 0, passthrough;
+	u32 sectors = 0, size = 0, pr_reg_type = 0;
+	u16 service_action;
+	u8 alua_ascq = 0;
+	/*
+	 * Check for an existing UNIT ATTENTION condition
+	 */
+	if (core_scsi3_ua_check(cmd, cdb) < 0) {
+		cmd->transport_wait_for_tasks =
+				&transport_nop_wait_for_tasks;
+		cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+		cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
+		return -2;
+	}
+	/*
+	 * Check status of Asymmetric Logical Unit Assignment port
+	 */
+	ret = T10_ALUA(su_dev)->alua_state_check(cmd, cdb, &alua_ascq);
+	if (ret != 0) {
+		cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
+		/*
+		 * Set SCSI additional sense code (ASC) to 'LUN Not Accessable';
+		 * The ALUA additional sense code qualifier (ASCQ) is determined
+		 * by the ALUA primary or secondary access state..
+		 */
+		if (ret > 0) {
+#if 0
+			printk(KERN_INFO "[%s]: ALUA TG Port not available,"
+				" SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
+				CMD_TFO(cmd)->get_fabric_name(), alua_ascq);
+#endif
+			transport_set_sense_codes(cmd, 0x04, alua_ascq);
+			cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+			cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
+			return -2;
+		}
+		goto out_invalid_cdb_field;
+	}
+	/*
+	 * Check status for SPC-3 Persistent Reservations
+	 */
+	if (T10_PR_OPS(su_dev)->t10_reservation_check(cmd, &pr_reg_type) != 0) {
+		if (T10_PR_OPS(su_dev)->t10_seq_non_holder(
+					cmd, cdb, pr_reg_type) != 0)
+			return transport_handle_reservation_conflict(cmd);
+		/*
+		 * This means the CDB is allowed for the SCSI Initiator port
+		 * when said port is *NOT* holding the legacy SPC-2 or
+		 * SPC-3 Persistent Reservation.
+		 */
+	}
+
+	switch (cdb[0]) {
+	case READ_6:
+		sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_6;
+		T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case READ_10:
+		sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_10;
+		T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case READ_12:
+		sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_12;
+		T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case READ_16:
+		sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_16;
+		T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case WRITE_6:
+		sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_6;
+		T_TASK(cmd)->t_task_lba = transport_lba_21(cdb);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case WRITE_10:
+		sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_10;
+		T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+		T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case WRITE_12:
+		sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_12;
+		T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+		T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case WRITE_16:
+		sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_16;
+		T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
+		T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		break;
+	case XDWRITEREAD_10:
+		if ((cmd->data_direction != DMA_TO_DEVICE) ||
+		    !(T_TASK(cmd)->t_tasks_bidi))
+			goto out_invalid_cdb_field;
+		sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->transport_split_cdb = &split_cdb_XX_10;
+		T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+		cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+		passthrough = (TRANSPORT(dev)->transport_type ==
+				TRANSPORT_PLUGIN_PHBA_PDEV);
+		/*
+		 * Skip the remaining assignments for TCM/PSCSI passthrough
+		 */
+		if (passthrough)
+			break;
+		/*
+		 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
+		 */
+		cmd->transport_complete_callback = &transport_xor_callback;
+		T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8);
+		break;
+	case VARIABLE_LENGTH_CMD:
+		service_action = get_unaligned_be16(&cdb[8]);
+		/*
+		 * Determine if this is TCM/PSCSI device and we should disable
+		 * internal emulation for this CDB.
+		 */
+		passthrough = (TRANSPORT(dev)->transport_type ==
+					TRANSPORT_PLUGIN_PHBA_PDEV);
+
+		switch (service_action) {
+		case XDWRITEREAD_32:
+			sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
+			if (sector_ret)
+				goto out_unsupported_cdb;
+			size = transport_get_size(sectors, cdb, cmd);
+			/*
+			 * Use WRITE_32 and READ_32 opcodes for the emulated
+			 * XDWRITE_READ_32 logic.
+			 */
+			cmd->transport_split_cdb = &split_cdb_XX_32;
+			T_TASK(cmd)->t_task_lba = transport_lba_64_ext(cdb);
+			cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+
+			/*
+			 * Skip the remaining assignments for TCM/PSCSI passthrough
+			 */
+			if (passthrough)
+				break;
+
+			/*
+			 * Setup BIDI XOR callback to be run during
+			 * transport_generic_complete_ok()
+			 */
+			cmd->transport_complete_callback = &transport_xor_callback;
+			T_TASK(cmd)->t_tasks_fua = (cdb[10] & 0x8);
+			break;
+		case WRITE_SAME_32:
+			sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
+			if (sector_ret)
+				goto out_unsupported_cdb;
+			size = transport_get_size(sectors, cdb, cmd);
+			T_TASK(cmd)->t_task_lba = get_unaligned_be64(&cdb[12]);
+			cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+
+			/*
+			 * Skip the remaining assignments for TCM/PSCSI passthrough
+			 */
+			if (passthrough)
+				break;
+
+			if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
+				printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
+					" bits not supported for Block Discard"
+					" Emulation\n");
+				goto out_invalid_cdb_field;
+			}
+			/*
+			 * Currently for the emulated case we only accept
+			 * tpws with the UNMAP=1 bit set.
+			 */
+			if (!(cdb[10] & 0x08)) {
+				printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not"
+					" supported for Block Discard Emulation\n");
+				goto out_invalid_cdb_field;
+			}
+			break;
+		default:
+			printk(KERN_ERR "VARIABLE_LENGTH_CMD service action"
+				" 0x%04x not supported\n", service_action);
+			goto out_unsupported_cdb;
+		}
+		break;
+	case 0xa3:
+		if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
+			/* MAINTENANCE_IN from SCC-2 */
+			/*
+			 * Check for emulated MI_REPORT_TARGET_PGS.
+			 */
+			if (cdb[1] == MI_REPORT_TARGET_PGS) {
+				cmd->transport_emulate_cdb =
+				(T10_ALUA(su_dev)->alua_type ==
+				 SPC3_ALUA_EMULATED) ?
+				&core_emulate_report_target_port_groups :
+				NULL;
+			}
+			size = (cdb[6] << 24) | (cdb[7] << 16) |
+			       (cdb[8] << 8) | cdb[9];
+		} else {
+			/* GPCMD_SEND_KEY from multi media commands */
+			size = (cdb[8] << 8) + cdb[9];
+		}
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case MODE_SELECT:
+		size = cdb[4];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+		break;
+	case MODE_SELECT_10:
+		size = (cdb[7] << 8) + cdb[8];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+		break;
+	case MODE_SENSE:
+		size = cdb[4];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case MODE_SENSE_10:
+	case GPCMD_READ_BUFFER_CAPACITY:
+	case GPCMD_SEND_OPC:
+	case LOG_SELECT:
+	case LOG_SENSE:
+		size = (cdb[7] << 8) + cdb[8];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case READ_BLOCK_LIMITS:
+		size = READ_BLOCK_LEN;
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case GPCMD_GET_CONFIGURATION:
+	case GPCMD_READ_FORMAT_CAPACITIES:
+	case GPCMD_READ_DISC_INFO:
+	case GPCMD_READ_TRACK_RZONE_INFO:
+		size = (cdb[7] << 8) + cdb[8];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+		break;
+	case PERSISTENT_RESERVE_IN:
+	case PERSISTENT_RESERVE_OUT:
+		cmd->transport_emulate_cdb =
+			(T10_RES(su_dev)->res_type ==
+			 SPC3_PERSISTENT_RESERVATIONS) ?
+			&core_scsi3_emulate_pr : NULL;
+		size = (cdb[7] << 8) + cdb[8];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case GPCMD_MECHANISM_STATUS:
+	case GPCMD_READ_DVD_STRUCTURE:
+		size = (cdb[8] << 8) + cdb[9];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+		break;
+	case READ_POSITION:
+		size = READ_POSITION_LEN;
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case 0xa4:
+		if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) {
+			/* MAINTENANCE_OUT from SCC-2
+			 *
+			 * Check for emulated MO_SET_TARGET_PGS.
+			 */
+			if (cdb[1] == MO_SET_TARGET_PGS) {
+				cmd->transport_emulate_cdb =
+				(T10_ALUA(su_dev)->alua_type ==
+					SPC3_ALUA_EMULATED) ?
+				&core_emulate_set_target_port_groups :
+				NULL;
+			}
+
+			size = (cdb[6] << 24) | (cdb[7] << 16) |
+			       (cdb[8] << 8) | cdb[9];
+		} else  {
+			/* GPCMD_REPORT_KEY from multi media commands */
+			size = (cdb[8] << 8) + cdb[9];
+		}
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case INQUIRY:
+		size = (cdb[3] << 8) + cdb[4];
+		/*
+		 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
+		 * See spc4r17 section 5.3
+		 */
+		if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+			cmd->sam_task_attr = TASK_ATTR_HOQ;
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case READ_BUFFER:
+		size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case READ_CAPACITY:
+		size = READ_CAP_LEN;
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case READ_MEDIA_SERIAL_NUMBER:
+	case SECURITY_PROTOCOL_IN:
+	case SECURITY_PROTOCOL_OUT:
+		size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case SERVICE_ACTION_IN:
+	case ACCESS_CONTROL_IN:
+	case ACCESS_CONTROL_OUT:
+	case EXTENDED_COPY:
+	case READ_ATTRIBUTE:
+	case RECEIVE_COPY_RESULTS:
+	case WRITE_ATTRIBUTE:
+		size = (cdb[10] << 24) | (cdb[11] << 16) |
+		       (cdb[12] << 8) | cdb[13];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case RECEIVE_DIAGNOSTIC:
+	case SEND_DIAGNOSTIC:
+		size = (cdb[3] << 8) | cdb[4];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
+#if 0
+	case GPCMD_READ_CD:
+		sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+		size = (2336 * sectors);
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+#endif
+	case READ_TOC:
+		size = cdb[8];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case REQUEST_SENSE:
+		size = cdb[4];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case READ_ELEMENT_STATUS:
+		size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case WRITE_BUFFER:
+		size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case RESERVE:
+	case RESERVE_10:
+		/*
+		 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
+		 * Assume the passthrough or $FABRIC_MOD will tell us about it.
+		 */
+		if (cdb[0] == RESERVE_10)
+			size = (cdb[7] << 8) | cdb[8];
+		else
+			size = cmd->data_length;
+
+		/*
+		 * Setup the legacy emulated handler for SPC-2 and
+		 * >= SPC-3 compatible reservation handling (CRH=1)
+		 * Otherwise, we assume the underlying SCSI logic is
+		 * is running in SPC_PASSTHROUGH, and wants reservations
+		 * emulation disabled.
+		 */
+		cmd->transport_emulate_cdb =
+				(T10_RES(su_dev)->res_type !=
+				 SPC_PASSTHROUGH) ?
+				&core_scsi2_emulate_crh : NULL;
+		cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+		break;
+	case RELEASE:
+	case RELEASE_10:
+		/*
+		 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
+		 * Assume the passthrough or $FABRIC_MOD will tell us about it.
+		*/
+		if (cdb[0] == RELEASE_10)
+			size = (cdb[7] << 8) | cdb[8];
+		else
+			size = cmd->data_length;
+
+		cmd->transport_emulate_cdb =
+				(T10_RES(su_dev)->res_type !=
+				 SPC_PASSTHROUGH) ?
+				&core_scsi2_emulate_crh : NULL;
+		cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+		break;
+	case SYNCHRONIZE_CACHE:
+	case 0x91: /* SYNCHRONIZE_CACHE_16: */
+		/*
+		 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
+		 */
+		if (cdb[0] == SYNCHRONIZE_CACHE) {
+			sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
+			T_TASK(cmd)->t_task_lba = transport_lba_32(cdb);
+		} else {
+			sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+			T_TASK(cmd)->t_task_lba = transport_lba_64(cdb);
+		}
+		if (sector_ret)
+			goto out_unsupported_cdb;
+
+		size = transport_get_size(sectors, cdb, cmd);
+		cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+
+		/*
+		 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
+		 */
+		if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
+			break;
+		/*
+		 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
+		 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
+		 */
+		cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
+		/*
+		 * Check to ensure that LBA + Range does not exceed past end of
+		 * device.
+		 */
+		if (transport_get_sectors(cmd) < 0)
+			goto out_invalid_cdb_field;
+		break;
+	case UNMAP:
+		size = get_unaligned_be16(&cdb[7]);
+		passthrough = (TRANSPORT(dev)->transport_type ==
+				TRANSPORT_PLUGIN_PHBA_PDEV);
+		/*
+		 * Determine if the received UNMAP used to for direct passthrough
+		 * into Linux/SCSI with struct request via TCM/pSCSI or we are
+		 * signaling the use of internal transport_generic_unmap() emulation
+		 * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO
+		 * subsystem plugin backstores.
+		 */
+		if (!(passthrough))
+			cmd->se_cmd_flags |= SCF_EMULATE_SYNC_UNMAP;
+
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	case WRITE_SAME_16:
+		sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
+		if (sector_ret)
+			goto out_unsupported_cdb;
+		size = transport_get_size(sectors, cdb, cmd);
+		T_TASK(cmd)->t_task_lba = get_unaligned_be16(&cdb[2]);
+		passthrough = (TRANSPORT(dev)->transport_type ==
+				TRANSPORT_PLUGIN_PHBA_PDEV);
+		/*
+		 * Determine if the received WRITE_SAME_16 is used to for direct
+		 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
+		 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
+		 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
+		 * TCM/FILEIO subsystem plugin backstores.
+		 */
+		if (!(passthrough)) {
+			if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
+				printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
+					" bits not supported for Block Discard"
+					" Emulation\n");
+				goto out_invalid_cdb_field;
+			}
+			/*
+			 * Currently for the emulated case we only accept
+			 * tpws with the UNMAP=1 bit set.
+			 */
+			if (!(cdb[1] & 0x08)) {
+				printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not "
+					" supported for Block Discard Emulation\n");
+				goto out_invalid_cdb_field;
+			}
+		}
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+		break;
+	case ALLOW_MEDIUM_REMOVAL:
+	case GPCMD_CLOSE_TRACK:
+	case ERASE:
+	case INITIALIZE_ELEMENT_STATUS:
+	case GPCMD_LOAD_UNLOAD:
+	case REZERO_UNIT:
+	case SEEK_10:
+	case GPCMD_SET_SPEED:
+	case SPACE:
+	case START_STOP:
+	case TEST_UNIT_READY:
+	case VERIFY:
+	case WRITE_FILEMARKS:
+	case MOVE_MEDIUM:
+		cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+		break;
+	case REPORT_LUNS:
+		cmd->transport_emulate_cdb =
+				&transport_core_report_lun_response;
+		size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+		/*
+		 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
+		 * See spc4r17 section 5.3
+		 */
+		if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+			cmd->sam_task_attr = TASK_ATTR_HOQ;
+		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
+		break;
+	default:
+		printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode"
+			" 0x%02x, sending CHECK_CONDITION.\n",
+			CMD_TFO(cmd)->get_fabric_name(), cdb[0]);
+		cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
+		goto out_unsupported_cdb;
+	}
+
+	if (size != cmd->data_length) {
+		printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:"
+			" %u does not match SCSI CDB Length: %u for SAM Opcode:"
+			" 0x%02x\n", CMD_TFO(cmd)->get_fabric_name(),
+				cmd->data_length, size, cdb[0]);
+
+		cmd->cmd_spdtl = size;
+
+		if (cmd->data_direction == DMA_TO_DEVICE) {
+			printk(KERN_ERR "Rejecting underflow/overflow"
+					" WRITE data\n");
+			goto out_invalid_cdb_field;
+		}
+		/*
+		 * Reject READ_* or WRITE_* with overflow/underflow for
+		 * type SCF_SCSI_DATA_SG_IO_CDB.
+		 */
+		if (!(ret) && (DEV_ATTRIB(dev)->block_size != 512))  {
+			printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op"
+				" CDB on non 512-byte sector setup subsystem"
+				" plugin: %s\n", TRANSPORT(dev)->name);
+			/* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
+			goto out_invalid_cdb_field;
+		}
+
+		if (size > cmd->data_length) {
+			cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
+			cmd->residual_count = (size - cmd->data_length);
+		} else {
+			cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
+			cmd->residual_count = (cmd->data_length - size);
+		}
+		cmd->data_length = size;
+	}
+
+	transport_set_supported_SAM_opcode(cmd);
+	return ret;
+
+out_unsupported_cdb:
+	cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+	cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
+	return -2;
+out_invalid_cdb_field:
+	cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+	cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+	return -2;
+}
+
+static inline void transport_release_tasks(struct se_cmd *);
+
+/*
+ * This function will copy a contiguous *src buffer into a destination
+ * struct scatterlist array.
+ */
+static void transport_memcpy_write_contig(
+	struct se_cmd *cmd,
+	struct scatterlist *sg_d,
+	unsigned char *src)
+{
+	u32 i = 0, length = 0, total_length = cmd->data_length;
+	void *dst;
+
+	while (total_length) {
+		length = sg_d[i].length;
+
+		if (length > total_length)
+			length = total_length;
+
+		dst = sg_virt(&sg_d[i]);
+
+		memcpy(dst, src, length);
+
+		if (!(total_length -= length))
+			return;
+
+		src += length;
+		i++;
+	}
+}
+
+/*
+ * This function will copy a struct scatterlist array *sg_s into a destination
+ * contiguous *dst buffer.
+ */
+static void transport_memcpy_read_contig(
+	struct se_cmd *cmd,
+	unsigned char *dst,
+	struct scatterlist *sg_s)
+{
+	u32 i = 0, length = 0, total_length = cmd->data_length;
+	void *src;
+
+	while (total_length) {
+		length = sg_s[i].length;
+
+		if (length > total_length)
+			length = total_length;
+
+		src = sg_virt(&sg_s[i]);
+
+		memcpy(dst, src, length);
+
+		if (!(total_length -= length))
+			return;
+
+		dst += length;
+		i++;
+	}
+}
+
+static void transport_memcpy_se_mem_read_contig(
+	struct se_cmd *cmd,
+	unsigned char *dst,
+	struct list_head *se_mem_list)
+{
+	struct se_mem *se_mem;
+	void *src;
+	u32 length = 0, total_length = cmd->data_length;
+
+	list_for_each_entry(se_mem, se_mem_list, se_list) {
+		length = se_mem->se_len;
+
+		if (length > total_length)
+			length = total_length;
+
+		src = page_address(se_mem->se_page) + se_mem->se_off;
+
+		memcpy(dst, src, length);
+
+		if (!(total_length -= length))
+			return;
+
+		dst += length;
+	}
+}
+
+/*
+ * Called from transport_generic_complete_ok() and
+ * transport_generic_request_failure() to determine which dormant/delayed
+ * and ordered cmds need to have their tasks added to the execution queue.
+ */
+static void transport_complete_task_attr(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_cmd *cmd_p, *cmd_tmp;
+	int new_active_tasks = 0;
+
+	if (cmd->sam_task_attr == TASK_ATTR_SIMPLE) {
+		atomic_dec(&dev->simple_cmds);
+		smp_mb__after_atomic_dec();
+		dev->dev_cur_ordered_id++;
+		DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
+			" SIMPLE: %u\n", dev->dev_cur_ordered_id,
+			cmd->se_ordered_id);
+	} else if (cmd->sam_task_attr == TASK_ATTR_HOQ) {
+		atomic_dec(&dev->dev_hoq_count);
+		smp_mb__after_atomic_dec();
+		dev->dev_cur_ordered_id++;
+		DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
+			" HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
+			cmd->se_ordered_id);
+	} else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) {
+		spin_lock(&dev->ordered_cmd_lock);
+		list_del(&cmd->se_ordered_list);
+		atomic_dec(&dev->dev_ordered_sync);
+		smp_mb__after_atomic_dec();
+		spin_unlock(&dev->ordered_cmd_lock);
+
+		dev->dev_cur_ordered_id++;
+		DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
+			" %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
+	}
+	/*
+	 * Process all commands up to the last received
+	 * ORDERED task attribute which requires another blocking
+	 * boundary
+	 */
+	spin_lock(&dev->delayed_cmd_lock);
+	list_for_each_entry_safe(cmd_p, cmd_tmp,
+			&dev->delayed_cmd_list, se_delayed_list) {
+
+		list_del(&cmd_p->se_delayed_list);
+		spin_unlock(&dev->delayed_cmd_lock);
+
+		DEBUG_STA("Calling add_tasks() for"
+			" cmd_p: 0x%02x Task Attr: 0x%02x"
+			" Dormant -> Active, se_ordered_id: %u\n",
+			T_TASK(cmd_p)->t_task_cdb[0],
+			cmd_p->sam_task_attr, cmd_p->se_ordered_id);
+
+		transport_add_tasks_from_cmd(cmd_p);
+		new_active_tasks++;
+
+		spin_lock(&dev->delayed_cmd_lock);
+		if (cmd_p->sam_task_attr == TASK_ATTR_ORDERED)
+			break;
+	}
+	spin_unlock(&dev->delayed_cmd_lock);
+	/*
+	 * If new tasks have become active, wake up the transport thread
+	 * to do the processing of the Active tasks.
+	 */
+	if (new_active_tasks != 0)
+		wake_up_interruptible(&dev->dev_queue_obj->thread_wq);
+}
+
+static void transport_generic_complete_ok(struct se_cmd *cmd)
+{
+	int reason = 0;
+	/*
+	 * Check if we need to move delayed/dormant tasks from cmds on the
+	 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
+	 * Attribute.
+	 */
+	if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
+		transport_complete_task_attr(cmd);
+	/*
+	 * Check if we need to retrieve a sense buffer from
+	 * the struct se_cmd in question.
+	 */
+	if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
+		if (transport_get_sense_data(cmd) < 0)
+			reason = TCM_NON_EXISTENT_LUN;
+
+		/*
+		 * Only set when an struct se_task->task_scsi_status returned
+		 * a non GOOD status.
+		 */
+		if (cmd->scsi_status) {
+			transport_send_check_condition_and_sense(
+					cmd, reason, 1);
+			transport_lun_remove_cmd(cmd);
+			transport_cmd_check_stop_to_fabric(cmd);
+			return;
+		}
+	}
+	/*
+	 * Check for a callback, used by amoungst other things
+	 * XDWRITE_READ_10 emulation.
+	 */
+	if (cmd->transport_complete_callback)
+		cmd->transport_complete_callback(cmd);
+
+	switch (cmd->data_direction) {
+	case DMA_FROM_DEVICE:
+		spin_lock(&cmd->se_lun->lun_sep_lock);
+		if (SE_LUN(cmd)->lun_sep) {
+			SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
+					cmd->data_length;
+		}
+		spin_unlock(&cmd->se_lun->lun_sep_lock);
+		/*
+		 * If enabled by TCM fabirc module pre-registered SGL
+		 * memory, perform the memcpy() from the TCM internal
+		 * contigious buffer back to the original SGL.
+		 */
+		if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
+			transport_memcpy_write_contig(cmd,
+				 T_TASK(cmd)->t_task_pt_sgl,
+				 T_TASK(cmd)->t_task_buf);
+
+		CMD_TFO(cmd)->queue_data_in(cmd);
+		break;
+	case DMA_TO_DEVICE:
+		spin_lock(&cmd->se_lun->lun_sep_lock);
+		if (SE_LUN(cmd)->lun_sep) {
+			SE_LUN(cmd)->lun_sep->sep_stats.rx_data_octets +=
+				cmd->data_length;
+		}
+		spin_unlock(&cmd->se_lun->lun_sep_lock);
+		/*
+		 * Check if we need to send READ payload for BIDI-COMMAND
+		 */
+		if (T_TASK(cmd)->t_mem_bidi_list != NULL) {
+			spin_lock(&cmd->se_lun->lun_sep_lock);
+			if (SE_LUN(cmd)->lun_sep) {
+				SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets +=
+					cmd->data_length;
+			}
+			spin_unlock(&cmd->se_lun->lun_sep_lock);
+			CMD_TFO(cmd)->queue_data_in(cmd);
+			break;
+		}
+		/* Fall through for DMA_TO_DEVICE */
+	case DMA_NONE:
+		CMD_TFO(cmd)->queue_status(cmd);
+		break;
+	default:
+		break;
+	}
+
+	transport_lun_remove_cmd(cmd);
+	transport_cmd_check_stop_to_fabric(cmd);
+}
+
+static void transport_free_dev_tasks(struct se_cmd *cmd)
+{
+	struct se_task *task, *task_tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	list_for_each_entry_safe(task, task_tmp,
+				&T_TASK(cmd)->t_task_list, t_list) {
+		if (atomic_read(&task->task_active))
+			continue;
+
+		kfree(task->task_sg_bidi);
+		kfree(task->task_sg);
+
+		list_del(&task->t_list);
+
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		if (task->se_dev)
+			TRANSPORT(task->se_dev)->free_task(task);
+		else
+			printk(KERN_ERR "task[%u] - task->se_dev is NULL\n",
+				task->task_no);
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	}
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+}
+
+static inline void transport_free_pages(struct se_cmd *cmd)
+{
+	struct se_mem *se_mem, *se_mem_tmp;
+	int free_page = 1;
+
+	if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
+		free_page = 0;
+	if (cmd->se_dev->transport->do_se_mem_map)
+		free_page = 0;
+
+	if (T_TASK(cmd)->t_task_buf) {
+		kfree(T_TASK(cmd)->t_task_buf);
+		T_TASK(cmd)->t_task_buf = NULL;
+		return;
+	}
+
+	/*
+	 * Caller will handle releasing of struct se_mem.
+	 */
+	if (cmd->se_cmd_flags & SCF_CMD_PASSTHROUGH_NOALLOC)
+		return;
+
+	if (!(T_TASK(cmd)->t_tasks_se_num))
+		return;
+
+	list_for_each_entry_safe(se_mem, se_mem_tmp,
+			T_TASK(cmd)->t_mem_list, se_list) {
+		/*
+		 * We only release call __free_page(struct se_mem->se_page) when
+		 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
+		 */
+		if (free_page)
+			__free_page(se_mem->se_page);
+
+		list_del(&se_mem->se_list);
+		kmem_cache_free(se_mem_cache, se_mem);
+	}
+
+	if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) {
+		list_for_each_entry_safe(se_mem, se_mem_tmp,
+				T_TASK(cmd)->t_mem_bidi_list, se_list) {
+			/*
+			 * We only release call __free_page(struct se_mem->se_page) when
+			 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
+			 */
+			if (free_page)
+				__free_page(se_mem->se_page);
+
+			list_del(&se_mem->se_list);
+			kmem_cache_free(se_mem_cache, se_mem);
+		}
+	}
+
+	kfree(T_TASK(cmd)->t_mem_bidi_list);
+	T_TASK(cmd)->t_mem_bidi_list = NULL;
+	kfree(T_TASK(cmd)->t_mem_list);
+	T_TASK(cmd)->t_mem_list = NULL;
+	T_TASK(cmd)->t_tasks_se_num = 0;
+}
+
+static inline void transport_release_tasks(struct se_cmd *cmd)
+{
+	transport_free_dev_tasks(cmd);
+}
+
+static inline int transport_dec_and_check(struct se_cmd *cmd)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+		if (!(atomic_dec_and_test(&T_TASK(cmd)->t_fe_count))) {
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+					flags);
+			return 1;
+		}
+	}
+
+	if (atomic_read(&T_TASK(cmd)->t_se_count)) {
+		if (!(atomic_dec_and_test(&T_TASK(cmd)->t_se_count))) {
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+					flags);
+			return 1;
+		}
+	}
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	return 0;
+}
+
+static void transport_release_fe_cmd(struct se_cmd *cmd)
+{
+	unsigned long flags;
+
+	if (transport_dec_and_check(cmd))
+		return;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		goto free_pages;
+	}
+	atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+	transport_all_task_dev_remove_state(cmd);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	transport_release_tasks(cmd);
+free_pages:
+	transport_free_pages(cmd);
+	transport_free_se_cmd(cmd);
+	CMD_TFO(cmd)->release_cmd_direct(cmd);
+}
+
+static int transport_generic_remove(
+	struct se_cmd *cmd,
+	int release_to_pool,
+	int session_reinstatement)
+{
+	unsigned long flags;
+
+	if (!(T_TASK(cmd)))
+		goto release_cmd;
+
+	if (transport_dec_and_check(cmd)) {
+		if (session_reinstatement) {
+			spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+			transport_all_task_dev_remove_state(cmd);
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+					flags);
+		}
+		return 1;
+	}
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		goto free_pages;
+	}
+	atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+	transport_all_task_dev_remove_state(cmd);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	transport_release_tasks(cmd);
+free_pages:
+	transport_free_pages(cmd);
+
+release_cmd:
+	if (release_to_pool) {
+		transport_release_cmd_to_pool(cmd);
+	} else {
+		transport_free_se_cmd(cmd);
+		CMD_TFO(cmd)->release_cmd_direct(cmd);
+	}
+
+	return 0;
+}
+
+/*
+ * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
+ * @cmd:  Associated se_cmd descriptor
+ * @mem:  SGL style memory for TCM WRITE / READ
+ * @sg_mem_num: Number of SGL elements
+ * @mem_bidi_in: SGL style memory for TCM BIDI READ
+ * @sg_mem_bidi_num: Number of BIDI READ SGL elements
+ *
+ * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
+ * of parameters.
+ */
+int transport_generic_map_mem_to_cmd(
+	struct se_cmd *cmd,
+	struct scatterlist *mem,
+	u32 sg_mem_num,
+	struct scatterlist *mem_bidi_in,
+	u32 sg_mem_bidi_num)
+{
+	u32 se_mem_cnt_out = 0;
+	int ret;
+
+	if (!(mem) || !(sg_mem_num))
+		return 0;
+	/*
+	 * Passed *mem will contain a list_head containing preformatted
+	 * struct se_mem elements...
+	 */
+	if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) {
+		if ((mem_bidi_in) || (sg_mem_bidi_num)) {
+			printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported"
+				" with BIDI-COMMAND\n");
+			return -ENOSYS;
+		}
+
+		T_TASK(cmd)->t_mem_list = (struct list_head *)mem;
+		T_TASK(cmd)->t_tasks_se_num = sg_mem_num;
+		cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC;
+		return 0;
+	}
+	/*
+	 * Otherwise, assume the caller is passing a struct scatterlist
+	 * array from include/linux/scatterlist.h
+	 */
+	if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
+	    (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
+		/*
+		 * For CDB using TCM struct se_mem linked list scatterlist memory
+		 * processed into a TCM struct se_subsystem_dev, we do the mapping
+		 * from the passed physical memory to struct se_mem->se_page here.
+		 */
+		T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
+		if (!(T_TASK(cmd)->t_mem_list))
+			return -ENOMEM;
+
+		ret = transport_map_sg_to_mem(cmd,
+			T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out);
+		if (ret < 0)
+			return -ENOMEM;
+
+		T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out;
+		/*
+		 * Setup BIDI READ list of struct se_mem elements
+		 */
+		if ((mem_bidi_in) && (sg_mem_bidi_num)) {
+			T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+			if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+				kfree(T_TASK(cmd)->t_mem_list);
+				return -ENOMEM;
+			}
+			se_mem_cnt_out = 0;
+
+			ret = transport_map_sg_to_mem(cmd,
+				T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in,
+				&se_mem_cnt_out);
+			if (ret < 0) {
+				kfree(T_TASK(cmd)->t_mem_list);
+				return -ENOMEM;
+			}
+
+			T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out;
+		}
+		cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
+
+	} else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
+		if (mem_bidi_in || sg_mem_bidi_num) {
+			printk(KERN_ERR "BIDI-Commands not supported using "
+				"SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
+			return -ENOSYS;
+		}
+		/*
+		 * For incoming CDBs using a contiguous buffer internall with TCM,
+		 * save the passed struct scatterlist memory.  After TCM storage object
+		 * processing has completed for this struct se_cmd, TCM core will call
+		 * transport_memcpy_[write,read]_contig() as necessary from
+		 * transport_generic_complete_ok() and transport_write_pending() in order
+		 * to copy the TCM buffer to/from the original passed *mem in SGL ->
+		 * struct scatterlist format.
+		 */
+		cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG;
+		T_TASK(cmd)->t_task_pt_sgl = mem;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
+
+
+static inline long long transport_dev_end_lba(struct se_device *dev)
+{
+	return dev->transport->get_blocks(dev) + 1;
+}
+
+static int transport_get_sectors(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+
+	T_TASK(cmd)->t_tasks_sectors =
+		(cmd->data_length / DEV_ATTRIB(dev)->block_size);
+	if (!(T_TASK(cmd)->t_tasks_sectors))
+		T_TASK(cmd)->t_tasks_sectors = 1;
+
+	if (TRANSPORT(dev)->get_device_type(dev) != TYPE_DISK)
+		return 0;
+
+	if ((T_TASK(cmd)->t_task_lba + T_TASK(cmd)->t_tasks_sectors) >
+	     transport_dev_end_lba(dev)) {
+		printk(KERN_ERR "LBA: %llu Sectors: %u exceeds"
+			" transport_dev_end_lba(): %llu\n",
+			T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
+			transport_dev_end_lba(dev));
+		cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+		cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
+		return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS;
+	}
+
+	return 0;
+}
+
+static int transport_new_cmd_obj(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	u32 task_cdbs = 0, rc;
+
+	if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
+		task_cdbs++;
+		T_TASK(cmd)->t_task_cdbs++;
+	} else {
+		int set_counts = 1;
+
+		/*
+		 * Setup any BIDI READ tasks and memory from
+		 * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks
+		 * are queued first for the non pSCSI passthrough case.
+		 */
+		if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
+		    (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
+			rc = transport_generic_get_cdb_count(cmd,
+				T_TASK(cmd)->t_task_lba,
+				T_TASK(cmd)->t_tasks_sectors,
+				DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list,
+				set_counts);
+			if (!(rc)) {
+				cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+				cmd->scsi_sense_reason =
+					TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+				return PYX_TRANSPORT_LU_COMM_FAILURE;
+			}
+			set_counts = 0;
+		}
+		/*
+		 * Setup the tasks and memory from T_TASK(cmd)->t_mem_list
+		 * Note for BIDI transfers this will contain the WRITE payload
+		 */
+		task_cdbs = transport_generic_get_cdb_count(cmd,
+				T_TASK(cmd)->t_task_lba,
+				T_TASK(cmd)->t_tasks_sectors,
+				cmd->data_direction, T_TASK(cmd)->t_mem_list,
+				set_counts);
+		if (!(task_cdbs)) {
+			cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+			cmd->scsi_sense_reason =
+					TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+			return PYX_TRANSPORT_LU_COMM_FAILURE;
+		}
+		T_TASK(cmd)->t_task_cdbs += task_cdbs;
+
+#if 0
+		printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:"
+			" %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length,
+			T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors,
+			T_TASK(cmd)->t_task_cdbs);
+#endif
+	}
+
+	atomic_set(&T_TASK(cmd)->t_task_cdbs_left, task_cdbs);
+	atomic_set(&T_TASK(cmd)->t_task_cdbs_ex_left, task_cdbs);
+	atomic_set(&T_TASK(cmd)->t_task_cdbs_timeout_left, task_cdbs);
+	return 0;
+}
+
+static struct list_head *transport_init_se_mem_list(void)
+{
+	struct list_head *se_mem_list;
+
+	se_mem_list = kzalloc(sizeof(struct list_head), GFP_KERNEL);
+	if (!(se_mem_list)) {
+		printk(KERN_ERR "Unable to allocate memory for se_mem_list\n");
+		return NULL;
+	}
+	INIT_LIST_HEAD(se_mem_list);
+
+	return se_mem_list;
+}
+
+static int
+transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
+{
+	unsigned char *buf;
+	struct se_mem *se_mem;
+
+	T_TASK(cmd)->t_mem_list = transport_init_se_mem_list();
+	if (!(T_TASK(cmd)->t_mem_list))
+		return -ENOMEM;
+
+	/*
+	 * If the device uses memory mapping this is enough.
+	 */
+	if (cmd->se_dev->transport->do_se_mem_map)
+		return 0;
+
+	/*
+	 * Setup BIDI-COMMAND READ list of struct se_mem elements
+	 */
+	if (T_TASK(cmd)->t_tasks_bidi) {
+		T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list();
+		if (!(T_TASK(cmd)->t_mem_bidi_list)) {
+			kfree(T_TASK(cmd)->t_mem_list);
+			return -ENOMEM;
+		}
+	}
+
+	while (length) {
+		se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
+		if (!(se_mem)) {
+			printk(KERN_ERR "Unable to allocate struct se_mem\n");
+			goto out;
+		}
+		INIT_LIST_HEAD(&se_mem->se_list);
+		se_mem->se_len = (length > dma_size) ? dma_size : length;
+
+/* #warning FIXME Allocate contigous pages for struct se_mem elements */
+		se_mem->se_page = (struct page *) alloc_pages(GFP_KERNEL, 0);
+		if (!(se_mem->se_page)) {
+			printk(KERN_ERR "alloc_pages() failed\n");
+			goto out;
+		}
+
+		buf = kmap_atomic(se_mem->se_page, KM_IRQ0);
+		if (!(buf)) {
+			printk(KERN_ERR "kmap_atomic() failed\n");
+			goto out;
+		}
+		memset(buf, 0, se_mem->se_len);
+		kunmap_atomic(buf, KM_IRQ0);
+
+		list_add_tail(&se_mem->se_list, T_TASK(cmd)->t_mem_list);
+		T_TASK(cmd)->t_tasks_se_num++;
+
+		DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
+			" Offset(%u)\n", se_mem->se_page, se_mem->se_len,
+			se_mem->se_off);
+
+		length -= se_mem->se_len;
+	}
+
+	DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
+			T_TASK(cmd)->t_tasks_se_num);
+
+	return 0;
+out:
+	return -1;
+}
+
+extern u32 transport_calc_sg_num(
+	struct se_task *task,
+	struct se_mem *in_se_mem,
+	u32 task_offset)
+{
+	struct se_cmd *se_cmd = task->task_se_cmd;
+	struct se_device *se_dev = SE_DEV(se_cmd);
+	struct se_mem *se_mem = in_se_mem;
+	struct target_core_fabric_ops *tfo = CMD_TFO(se_cmd);
+	u32 sg_length, task_size = task->task_size, task_sg_num_padded;
+
+	while (task_size != 0) {
+		DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
+			" se_mem->se_off(%u) task_offset(%u)\n",
+			se_mem->se_page, se_mem->se_len,
+			se_mem->se_off, task_offset);
+
+		if (task_offset == 0) {
+			if (task_size >= se_mem->se_len) {
+				sg_length = se_mem->se_len;
+
+				if (!(list_is_last(&se_mem->se_list,
+						T_TASK(se_cmd)->t_mem_list)))
+					se_mem = list_entry(se_mem->se_list.next,
+							struct se_mem, se_list);
+			} else {
+				sg_length = task_size;
+				task_size -= sg_length;
+				goto next;
+			}
+
+			DEBUG_SC("sg_length(%u) task_size(%u)\n",
+					sg_length, task_size);
+		} else {
+			if ((se_mem->se_len - task_offset) > task_size) {
+				sg_length = task_size;
+				task_size -= sg_length;
+				goto next;
+			 } else {
+				sg_length = (se_mem->se_len - task_offset);
+
+				if (!(list_is_last(&se_mem->se_list,
+						T_TASK(se_cmd)->t_mem_list)))
+					se_mem = list_entry(se_mem->se_list.next,
+							struct se_mem, se_list);
+			}
+
+			DEBUG_SC("sg_length(%u) task_size(%u)\n",
+					sg_length, task_size);
+
+			task_offset = 0;
+		}
+		task_size -= sg_length;
+next:
+		DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
+			task->task_no, task_size);
+
+		task->task_sg_num++;
+	}
+	/*
+	 * Check if the fabric module driver is requesting that all
+	 * struct se_task->task_sg[] be chained together..  If so,
+	 * then allocate an extra padding SG entry for linking and
+	 * marking the end of the chained SGL.
+	 */
+	if (tfo->task_sg_chaining) {
+		task_sg_num_padded = (task->task_sg_num + 1);
+		task->task_padded_sg = 1;
+	} else
+		task_sg_num_padded = task->task_sg_num;
+
+	task->task_sg = kzalloc(task_sg_num_padded *
+			sizeof(struct scatterlist), GFP_KERNEL);
+	if (!(task->task_sg)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+				" task->task_sg\n");
+		return 0;
+	}
+	sg_init_table(&task->task_sg[0], task_sg_num_padded);
+	/*
+	 * Setup task->task_sg_bidi for SCSI READ payload for
+	 * TCM/pSCSI passthrough if present for BIDI-COMMAND
+	 */
+	if ((T_TASK(se_cmd)->t_mem_bidi_list != NULL) &&
+	    (TRANSPORT(se_dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) {
+		task->task_sg_bidi = kzalloc(task_sg_num_padded *
+				sizeof(struct scatterlist), GFP_KERNEL);
+		if (!(task->task_sg_bidi)) {
+			printk(KERN_ERR "Unable to allocate memory for"
+				" task->task_sg_bidi\n");
+			return 0;
+		}
+		sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded);
+	}
+	/*
+	 * For the chaining case, setup the proper end of SGL for the
+	 * initial submission struct task into struct se_subsystem_api.
+	 * This will be cleared later by transport_do_task_sg_chain()
+	 */
+	if (task->task_padded_sg) {
+		sg_mark_end(&task->task_sg[task->task_sg_num - 1]);
+		/*
+		 * Added the 'if' check before marking end of bi-directional
+		 * scatterlist (which gets created only in case of request
+		 * (RD + WR).
+		 */
+		if (task->task_sg_bidi)
+			sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]);
+	}
+
+	DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
+		" task_sg_num_padded(%u)\n", task->task_sg_num,
+		task_sg_num_padded);
+
+	return task->task_sg_num;
+}
+
+static inline int transport_set_tasks_sectors_disk(
+	struct se_task *task,
+	struct se_device *dev,
+	unsigned long long lba,
+	u32 sectors,
+	int *max_sectors_set)
+{
+	if ((lba + sectors) > transport_dev_end_lba(dev)) {
+		task->task_sectors = ((transport_dev_end_lba(dev) - lba) + 1);
+
+		if (task->task_sectors > DEV_ATTRIB(dev)->max_sectors) {
+			task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
+			*max_sectors_set = 1;
+		}
+	} else {
+		if (sectors > DEV_ATTRIB(dev)->max_sectors) {
+			task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
+			*max_sectors_set = 1;
+		} else
+			task->task_sectors = sectors;
+	}
+
+	return 0;
+}
+
+static inline int transport_set_tasks_sectors_non_disk(
+	struct se_task *task,
+	struct se_device *dev,
+	unsigned long long lba,
+	u32 sectors,
+	int *max_sectors_set)
+{
+	if (sectors > DEV_ATTRIB(dev)->max_sectors) {
+		task->task_sectors = DEV_ATTRIB(dev)->max_sectors;
+		*max_sectors_set = 1;
+	} else
+		task->task_sectors = sectors;
+
+	return 0;
+}
+
+static inline int transport_set_tasks_sectors(
+	struct se_task *task,
+	struct se_device *dev,
+	unsigned long long lba,
+	u32 sectors,
+	int *max_sectors_set)
+{
+	return (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) ?
+		transport_set_tasks_sectors_disk(task, dev, lba, sectors,
+				max_sectors_set) :
+		transport_set_tasks_sectors_non_disk(task, dev, lba, sectors,
+				max_sectors_set);
+}
+
+static int transport_map_sg_to_mem(
+	struct se_cmd *cmd,
+	struct list_head *se_mem_list,
+	void *in_mem,
+	u32 *se_mem_cnt)
+{
+	struct se_mem *se_mem;
+	struct scatterlist *sg;
+	u32 sg_count = 1, cmd_size = cmd->data_length;
+
+	if (!in_mem) {
+		printk(KERN_ERR "No source scatterlist\n");
+		return -1;
+	}
+	sg = (struct scatterlist *)in_mem;
+
+	while (cmd_size) {
+		se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
+		if (!(se_mem)) {
+			printk(KERN_ERR "Unable to allocate struct se_mem\n");
+			return -1;
+		}
+		INIT_LIST_HEAD(&se_mem->se_list);
+		DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
+			" sg_page: %p offset: %d length: %d\n", cmd_size,
+			sg_page(sg), sg->offset, sg->length);
+
+		se_mem->se_page = sg_page(sg);
+		se_mem->se_off = sg->offset;
+
+		if (cmd_size > sg->length) {
+			se_mem->se_len = sg->length;
+			sg = sg_next(sg);
+			sg_count++;
+		} else
+			se_mem->se_len = cmd_size;
+
+		cmd_size -= se_mem->se_len;
+
+		DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n",
+				*se_mem_cnt, cmd_size);
+		DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
+				se_mem->se_page, se_mem->se_off, se_mem->se_len);
+
+		list_add_tail(&se_mem->se_list, se_mem_list);
+		(*se_mem_cnt)++;
+	}
+
+	DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)"
+		" struct se_mem\n", sg_count, *se_mem_cnt);
+
+	if (sg_count != *se_mem_cnt)
+		BUG();
+
+	return 0;
+}
+
+/*	transport_map_mem_to_sg():
+ *
+ *
+ */
+int transport_map_mem_to_sg(
+	struct se_task *task,
+	struct list_head *se_mem_list,
+	void *in_mem,
+	struct se_mem *in_se_mem,
+	struct se_mem **out_se_mem,
+	u32 *se_mem_cnt,
+	u32 *task_offset)
+{
+	struct se_cmd *se_cmd = task->task_se_cmd;
+	struct se_mem *se_mem = in_se_mem;
+	struct scatterlist *sg = (struct scatterlist *)in_mem;
+	u32 task_size = task->task_size, sg_no = 0;
+
+	if (!sg) {
+		printk(KERN_ERR "Unable to locate valid struct"
+				" scatterlist pointer\n");
+		return -1;
+	}
+
+	while (task_size != 0) {
+		/*
+		 * Setup the contigious array of scatterlists for
+		 * this struct se_task.
+		 */
+		sg_assign_page(sg, se_mem->se_page);
+
+		if (*task_offset == 0) {
+			sg->offset = se_mem->se_off;
+
+			if (task_size >= se_mem->se_len) {
+				sg->length = se_mem->se_len;
+
+				if (!(list_is_last(&se_mem->se_list,
+						T_TASK(se_cmd)->t_mem_list))) {
+					se_mem = list_entry(se_mem->se_list.next,
+							struct se_mem, se_list);
+					(*se_mem_cnt)++;
+				}
+			} else {
+				sg->length = task_size;
+				/*
+				 * Determine if we need to calculate an offset
+				 * into the struct se_mem on the next go around..
+				 */
+				task_size -= sg->length;
+				if (!(task_size))
+					*task_offset = sg->length;
+
+				goto next;
+			}
+
+		} else {
+			sg->offset = (*task_offset + se_mem->se_off);
+
+			if ((se_mem->se_len - *task_offset) > task_size) {
+				sg->length = task_size;
+				/*
+				 * Determine if we need to calculate an offset
+				 * into the struct se_mem on the next go around..
+				 */
+				task_size -= sg->length;
+				if (!(task_size))
+					*task_offset += sg->length;
+
+				goto next;
+			} else {
+				sg->length = (se_mem->se_len - *task_offset);
+
+				if (!(list_is_last(&se_mem->se_list,
+						T_TASK(se_cmd)->t_mem_list))) {
+					se_mem = list_entry(se_mem->se_list.next,
+							struct se_mem, se_list);
+					(*se_mem_cnt)++;
+				}
+			}
+
+			*task_offset = 0;
+		}
+		task_size -= sg->length;
+next:
+		DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
+			" task_size to(%u), task_offset: %u\n", task->task_no, sg_no,
+			sg_page(sg), sg->length, sg->offset, task_size, *task_offset);
+
+		sg_no++;
+		if (!(task_size))
+			break;
+
+		sg = sg_next(sg);
+
+		if (task_size > se_cmd->data_length)
+			BUG();
+	}
+	*out_se_mem = se_mem;
+
+	DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
+		" SGs\n", task->task_no, *se_mem_cnt, sg_no);
+
+	return 0;
+}
+
+/*
+ * This function can be used by HW target mode drivers to create a linked
+ * scatterlist from all contiguously allocated struct se_task->task_sg[].
+ * This is intended to be called during the completion path by TCM Core
+ * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
+ */
+void transport_do_task_sg_chain(struct se_cmd *cmd)
+{
+	struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL;
+	struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL;
+	struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL;
+	struct se_task *task;
+	struct target_core_fabric_ops *tfo = CMD_TFO(cmd);
+	u32 task_sg_num = 0, sg_count = 0;
+	int i;
+
+	if (tfo->task_sg_chaining == 0) {
+		printk(KERN_ERR "task_sg_chaining is diabled for fabric module:"
+				" %s\n", tfo->get_fabric_name());
+		dump_stack();
+		return;
+	}
+	/*
+	 * Walk the struct se_task list and setup scatterlist chains
+	 * for each contiguosly allocated struct se_task->task_sg[].
+	 */
+	list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+		if (!(task->task_sg) || !(task->task_padded_sg))
+			continue;
+
+		if (sg_head && sg_link) {
+			sg_head_cur = &task->task_sg[0];
+			sg_link_cur = &task->task_sg[task->task_sg_num];
+			/*
+			 * Either add chain or mark end of scatterlist
+			 */
+			if (!(list_is_last(&task->t_list,
+					&T_TASK(cmd)->t_task_list))) {
+				/*
+				 * Clear existing SGL termination bit set in
+				 * transport_calc_sg_num(), see sg_mark_end()
+				 */
+				sg_end_cur = &task->task_sg[task->task_sg_num - 1];
+				sg_end_cur->page_link &= ~0x02;
+
+				sg_chain(sg_head, task_sg_num, sg_head_cur);
+				sg_count += (task->task_sg_num + 1);
+			} else
+				sg_count += task->task_sg_num;
+
+			sg_head = sg_head_cur;
+			sg_link = sg_link_cur;
+			task_sg_num = task->task_sg_num;
+			continue;
+		}
+		sg_head = sg_first = &task->task_sg[0];
+		sg_link = &task->task_sg[task->task_sg_num];
+		task_sg_num = task->task_sg_num;
+		/*
+		 * Check for single task..
+		 */
+		if (!(list_is_last(&task->t_list, &T_TASK(cmd)->t_task_list))) {
+			/*
+			 * Clear existing SGL termination bit set in
+			 * transport_calc_sg_num(), see sg_mark_end()
+			 */
+			sg_end = &task->task_sg[task->task_sg_num - 1];
+			sg_end->page_link &= ~0x02;
+			sg_count += (task->task_sg_num + 1);
+		} else
+			sg_count += task->task_sg_num;
+	}
+	/*
+	 * Setup the starting pointer and total t_tasks_sg_linked_no including
+	 * padding SGs for linking and to mark the end.
+	 */
+	T_TASK(cmd)->t_tasks_sg_chained = sg_first;
+	T_TASK(cmd)->t_tasks_sg_chained_no = sg_count;
+
+	DEBUG_CMD_M("Setup T_TASK(cmd)->t_tasks_sg_chained: %p and"
+		" t_tasks_sg_chained_no: %u\n", T_TASK(cmd)->t_tasks_sg_chained,
+		T_TASK(cmd)->t_tasks_sg_chained_no);
+
+	for_each_sg(T_TASK(cmd)->t_tasks_sg_chained, sg,
+			T_TASK(cmd)->t_tasks_sg_chained_no, i) {
+
+		DEBUG_CMD_M("SG: %p page: %p length: %d offset: %d\n",
+			sg, sg_page(sg), sg->length, sg->offset);
+		if (sg_is_chain(sg))
+			DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg);
+		if (sg_is_last(sg))
+			DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg);
+	}
+
+}
+EXPORT_SYMBOL(transport_do_task_sg_chain);
+
+static int transport_do_se_mem_map(
+	struct se_device *dev,
+	struct se_task *task,
+	struct list_head *se_mem_list,
+	void *in_mem,
+	struct se_mem *in_se_mem,
+	struct se_mem **out_se_mem,
+	u32 *se_mem_cnt,
+	u32 *task_offset_in)
+{
+	u32 task_offset = *task_offset_in;
+	int ret = 0;
+	/*
+	 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
+	 * has been done by the transport plugin.
+	 */
+	if (TRANSPORT(dev)->do_se_mem_map) {
+		ret = TRANSPORT(dev)->do_se_mem_map(task, se_mem_list,
+				in_mem, in_se_mem, out_se_mem, se_mem_cnt,
+				task_offset_in);
+		if (ret == 0)
+			T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
+
+		return ret;
+	}
+	/*
+	 * This is the normal path for all normal non BIDI and BIDI-COMMAND
+	 * WRITE payloads..  If we need to do BIDI READ passthrough for
+	 * TCM/pSCSI the first call to transport_do_se_mem_map ->
+	 * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the
+	 * allocation for task->task_sg_bidi, and the subsequent call to
+	 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
+	 */
+	if (!(task->task_sg_bidi)) {
+		/*
+		 * Assume default that transport plugin speaks preallocated
+		 * scatterlists.
+		 */
+		if (!(transport_calc_sg_num(task, in_se_mem, task_offset)))
+			return -1;
+		/*
+		 * struct se_task->task_sg now contains the struct scatterlist array.
+		 */
+		return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
+					in_se_mem, out_se_mem, se_mem_cnt,
+					task_offset_in);
+	}
+	/*
+	 * Handle the se_mem_list -> struct task->task_sg_bidi
+	 * memory map for the extra BIDI READ payload
+	 */
+	return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi,
+				in_se_mem, out_se_mem, se_mem_cnt,
+				task_offset_in);
+}
+
+static u32 transport_generic_get_cdb_count(
+	struct se_cmd *cmd,
+	unsigned long long lba,
+	u32 sectors,
+	enum dma_data_direction data_direction,
+	struct list_head *mem_list,
+	int set_counts)
+{
+	unsigned char *cdb = NULL;
+	struct se_task *task;
+	struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
+	struct se_mem *se_mem_bidi = NULL, *se_mem_bidi_lout = NULL;
+	struct se_device *dev = SE_DEV(cmd);
+	int max_sectors_set = 0, ret;
+	u32 task_offset_in = 0, se_mem_cnt = 0, se_mem_bidi_cnt = 0, task_cdbs = 0;
+
+	if (!mem_list) {
+		printk(KERN_ERR "mem_list is NULL in transport_generic_get"
+				"_cdb_count()\n");
+		return 0;
+	}
+	/*
+	 * While using RAMDISK_DR backstores is the only case where
+	 * mem_list will ever be empty at this point.
+	 */
+	if (!(list_empty(mem_list)))
+		se_mem = list_entry(mem_list->next, struct se_mem, se_list);
+	/*
+	 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
+	 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
+	 */
+	if ((T_TASK(cmd)->t_mem_bidi_list != NULL) &&
+	    !(list_empty(T_TASK(cmd)->t_mem_bidi_list)) &&
+	    (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV))
+		se_mem_bidi = list_entry(T_TASK(cmd)->t_mem_bidi_list->next,
+					struct se_mem, se_list);
+
+	while (sectors) {
+		DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
+			CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors,
+			transport_dev_end_lba(dev));
+
+		task = transport_generic_get_task(cmd, data_direction);
+		if (!(task))
+			goto out;
+
+		transport_set_tasks_sectors(task, dev, lba, sectors,
+				&max_sectors_set);
+
+		task->task_lba = lba;
+		lba += task->task_sectors;
+		sectors -= task->task_sectors;
+		task->task_size = (task->task_sectors *
+				   DEV_ATTRIB(dev)->block_size);
+
+		cdb = TRANSPORT(dev)->get_cdb(task);
+		if ((cdb)) {
+			memcpy(cdb, T_TASK(cmd)->t_task_cdb,
+				scsi_command_size(T_TASK(cmd)->t_task_cdb));
+			cmd->transport_split_cdb(task->task_lba,
+					&task->task_sectors, cdb);
+		}
+
+		/*
+		 * Perform the SE OBJ plugin and/or Transport plugin specific
+		 * mapping for T_TASK(cmd)->t_mem_list. And setup the
+		 * task->task_sg and if necessary task->task_sg_bidi
+		 */
+		ret = transport_do_se_mem_map(dev, task, mem_list,
+				NULL, se_mem, &se_mem_lout, &se_mem_cnt,
+				&task_offset_in);
+		if (ret < 0)
+			goto out;
+
+		se_mem = se_mem_lout;
+		/*
+		 * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi
+		 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
+		 *
+		 * Note that the first call to transport_do_se_mem_map() above will
+		 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
+		 * -> transport_calc_sg_num(), and the second here will do the
+		 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
+		 */
+		if (task->task_sg_bidi != NULL) {
+			ret = transport_do_se_mem_map(dev, task,
+				T_TASK(cmd)->t_mem_bidi_list, NULL,
+				se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt,
+				&task_offset_in);
+			if (ret < 0)
+				goto out;
+
+			se_mem_bidi = se_mem_bidi_lout;
+		}
+		task_cdbs++;
+
+		DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
+				task_cdbs, task->task_sg_num);
+
+		if (max_sectors_set) {
+			max_sectors_set = 0;
+			continue;
+		}
+
+		if (!sectors)
+			break;
+	}
+
+	if (set_counts) {
+		atomic_inc(&T_TASK(cmd)->t_fe_count);
+		atomic_inc(&T_TASK(cmd)->t_se_count);
+	}
+
+	DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
+		CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
+		? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
+
+	return task_cdbs;
+out:
+	return 0;
+}
+
+static int
+transport_map_control_cmd_to_task(struct se_cmd *cmd)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	unsigned char *cdb;
+	struct se_task *task;
+	int ret;
+
+	task = transport_generic_get_task(cmd, cmd->data_direction);
+	if (!task)
+		return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+
+	cdb = TRANSPORT(dev)->get_cdb(task);
+	if (cdb)
+		memcpy(cdb, cmd->t_task->t_task_cdb,
+			scsi_command_size(cmd->t_task->t_task_cdb));
+
+	task->task_size = cmd->data_length;
+	task->task_sg_num =
+		(cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0;
+
+	atomic_inc(&cmd->t_task->t_fe_count);
+	atomic_inc(&cmd->t_task->t_se_count);
+
+	if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
+		struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
+		u32 se_mem_cnt = 0, task_offset = 0;
+
+		BUG_ON(list_empty(cmd->t_task->t_mem_list));
+
+		ret = transport_do_se_mem_map(dev, task,
+				cmd->t_task->t_mem_list, NULL, se_mem,
+				&se_mem_lout, &se_mem_cnt, &task_offset);
+		if (ret < 0)
+			return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+
+		if (dev->transport->map_task_SG)
+			return dev->transport->map_task_SG(task);
+		return 0;
+	} else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
+		if (dev->transport->map_task_non_SG)
+			return dev->transport->map_task_non_SG(task);
+		return 0;
+	} else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
+		if (dev->transport->cdb_none)
+			return dev->transport->cdb_none(task);
+		return 0;
+	} else {
+		BUG();
+		return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+	}
+}
+
+/*	 transport_generic_new_cmd(): Called from transport_processing_thread()
+ *
+ *	 Allocate storage transport resources from a set of values predefined
+ *	 by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
+ *	 Any non zero return here is treated as an "out of resource' op here.
+ */
+	/*
+	 * Generate struct se_task(s) and/or their payloads for this CDB.
+	 */
+static int transport_generic_new_cmd(struct se_cmd *cmd)
+{
+	struct se_portal_group *se_tpg;
+	struct se_task *task;
+	struct se_device *dev = SE_DEV(cmd);
+	int ret = 0;
+
+	/*
+	 * Determine is the TCM fabric module has already allocated physical
+	 * memory, and is directly calling transport_generic_map_mem_to_cmd()
+	 * to setup beforehand the linked list of physical memory at
+	 * T_TASK(cmd)->t_mem_list of struct se_mem->se_page
+	 */
+	if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
+		ret = transport_allocate_resources(cmd);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = transport_get_sectors(cmd);
+	if (ret < 0)
+		return ret;
+
+	ret = transport_new_cmd_obj(cmd);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Determine if the calling TCM fabric module is talking to
+	 * Linux/NET via kernel sockets and needs to allocate a
+	 * struct iovec array to complete the struct se_cmd
+	 */
+	se_tpg = SE_LUN(cmd)->lun_sep->sep_tpg;
+	if (TPG_TFO(se_tpg)->alloc_cmd_iovecs != NULL) {
+		ret = TPG_TFO(se_tpg)->alloc_cmd_iovecs(cmd);
+		if (ret < 0)
+			return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
+	}
+
+	if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
+		list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) {
+			if (atomic_read(&task->task_sent))
+				continue;
+			if (!dev->transport->map_task_SG)
+				continue;
+
+			ret = dev->transport->map_task_SG(task);
+			if (ret < 0)
+				return ret;
+		}
+	} else {
+		ret = transport_map_control_cmd_to_task(cmd);
+		if (ret < 0)
+			return ret;
+	}
+
+	/*
+	 * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready..
+	 * This WRITE struct se_cmd (and all of its associated struct se_task's)
+	 * will be added to the struct se_device execution queue after its WRITE
+	 * data has arrived. (ie: It gets handled by the transport processing
+	 * thread a second time)
+	 */
+	if (cmd->data_direction == DMA_TO_DEVICE) {
+		transport_add_tasks_to_state_queue(cmd);
+		return transport_generic_write_pending(cmd);
+	}
+	/*
+	 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
+	 * to the execution queue.
+	 */
+	transport_execute_tasks(cmd);
+	return 0;
+}
+
+/*	transport_generic_process_write():
+ *
+ *
+ */
+void transport_generic_process_write(struct se_cmd *cmd)
+{
+#if 0
+	/*
+	 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
+	 * original EDTL
+	 */
+	if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
+		if (!T_TASK(cmd)->t_tasks_se_num) {
+			unsigned char *dst, *buf =
+				(unsigned char *)T_TASK(cmd)->t_task_buf;
+
+			dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL);
+			if (!(dst)) {
+				printk(KERN_ERR "Unable to allocate memory for"
+						" WRITE underflow\n");
+				transport_generic_request_failure(cmd, NULL,
+					PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
+				return;
+			}
+			memcpy(dst, buf, cmd->cmd_spdtl);
+
+			kfree(T_TASK(cmd)->t_task_buf);
+			T_TASK(cmd)->t_task_buf = dst;
+		} else {
+			struct scatterlist *sg =
+				(struct scatterlist *sg)T_TASK(cmd)->t_task_buf;
+			struct scatterlist *orig_sg;
+
+			orig_sg = kzalloc(sizeof(struct scatterlist) *
+					T_TASK(cmd)->t_tasks_se_num,
+					GFP_KERNEL))) {
+			if (!(orig_sg)) {
+				printk(KERN_ERR "Unable to allocate memory"
+						" for WRITE underflow\n");
+				transport_generic_request_failure(cmd, NULL,
+					PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
+				return;
+			}
+
+			memcpy(orig_sg, T_TASK(cmd)->t_task_buf,
+					sizeof(struct scatterlist) *
+					T_TASK(cmd)->t_tasks_se_num);
+
+			cmd->data_length = cmd->cmd_spdtl;
+			/*
+			 * FIXME, clear out original struct se_task and state
+			 * information.
+			 */
+			if (transport_generic_new_cmd(cmd) < 0) {
+				transport_generic_request_failure(cmd, NULL,
+					PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
+				kfree(orig_sg);
+				return;
+			}
+
+			transport_memcpy_write_sg(cmd, orig_sg);
+		}
+	}
+#endif
+	transport_execute_tasks(cmd);
+}
+EXPORT_SYMBOL(transport_generic_process_write);
+
+/*	transport_generic_write_pending():
+ *
+ *
+ */
+static int transport_generic_write_pending(struct se_cmd *cmd)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	cmd->t_state = TRANSPORT_WRITE_PENDING;
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+	/*
+	 * For the TCM control CDBs using a contiguous buffer, do the memcpy
+	 * from the passed Linux/SCSI struct scatterlist located at
+	 * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at
+	 * T_TASK(se_cmd)->t_task_buf.
+	 */
+	if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
+		transport_memcpy_read_contig(cmd,
+				T_TASK(cmd)->t_task_buf,
+				T_TASK(cmd)->t_task_pt_sgl);
+	/*
+	 * Clear the se_cmd for WRITE_PENDING status in order to set
+	 * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data
+	 * can be called from HW target mode interrupt code.  This is safe
+	 * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending
+	 * because the se_cmd->se_lun pointer is not being cleared.
+	 */
+	transport_cmd_check_stop(cmd, 1, 0);
+
+	/*
+	 * Call the fabric write_pending function here to let the
+	 * frontend know that WRITE buffers are ready.
+	 */
+	ret = CMD_TFO(cmd)->write_pending(cmd);
+	if (ret < 0)
+		return ret;
+
+	return PYX_TRANSPORT_WRITE_PENDING;
+}
+
+/*	transport_release_cmd_to_pool():
+ *
+ *
+ */
+void transport_release_cmd_to_pool(struct se_cmd *cmd)
+{
+	BUG_ON(!T_TASK(cmd));
+	BUG_ON(!CMD_TFO(cmd));
+
+	transport_free_se_cmd(cmd);
+	CMD_TFO(cmd)->release_cmd_to_pool(cmd);
+}
+EXPORT_SYMBOL(transport_release_cmd_to_pool);
+
+/*	transport_generic_free_cmd():
+ *
+ *	Called from processing frontend to release storage engine resources
+ */
+void transport_generic_free_cmd(
+	struct se_cmd *cmd,
+	int wait_for_tasks,
+	int release_to_pool,
+	int session_reinstatement)
+{
+	if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) || !T_TASK(cmd))
+		transport_release_cmd_to_pool(cmd);
+	else {
+		core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
+
+		if (SE_LUN(cmd)) {
+#if 0
+			printk(KERN_INFO "cmd: %p ITT: 0x%08x contains"
+				" SE_LUN(cmd)\n", cmd,
+				CMD_TFO(cmd)->get_task_tag(cmd));
+#endif
+			transport_lun_remove_cmd(cmd);
+		}
+
+		if (wait_for_tasks && cmd->transport_wait_for_tasks)
+			cmd->transport_wait_for_tasks(cmd, 0, 0);
+
+		transport_generic_remove(cmd, release_to_pool,
+				session_reinstatement);
+	}
+}
+EXPORT_SYMBOL(transport_generic_free_cmd);
+
+static void transport_nop_wait_for_tasks(
+	struct se_cmd *cmd,
+	int remove_cmd,
+	int session_reinstatement)
+{
+	return;
+}
+
+/*	transport_lun_wait_for_tasks():
+ *
+ *	Called from ConfigFS context to stop the passed struct se_cmd to allow
+ *	an struct se_lun to be successfully shutdown.
+ */
+static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
+{
+	unsigned long flags;
+	int ret;
+	/*
+	 * If the frontend has already requested this struct se_cmd to
+	 * be stopped, we can safely ignore this struct se_cmd.
+	 */
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (atomic_read(&T_TASK(cmd)->t_transport_stop)) {
+		atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
+		DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
+			" TRUE, skipping\n", CMD_TFO(cmd)->get_task_tag(cmd));
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		transport_cmd_check_stop(cmd, 1, 0);
+		return -1;
+	}
+	atomic_set(&T_TASK(cmd)->transport_lun_fe_stop, 1);
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
+
+	ret = transport_stop_tasks_for_cmd(cmd);
+
+	DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
+			" %d\n", cmd, T_TASK(cmd)->t_task_cdbs, ret);
+	if (!ret) {
+		DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
+				CMD_TFO(cmd)->get_task_tag(cmd));
+		wait_for_completion(&T_TASK(cmd)->transport_lun_stop_comp);
+		DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
+				CMD_TFO(cmd)->get_task_tag(cmd));
+	}
+	transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj);
+
+	return 0;
+}
+
+/* #define DEBUG_CLEAR_LUN */
+#ifdef DEBUG_CLEAR_LUN
+#define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
+#else
+#define DEBUG_CLEAR_L(x...)
+#endif
+
+static void __transport_clear_lun_from_sessions(struct se_lun *lun)
+{
+	struct se_cmd *cmd = NULL;
+	unsigned long lun_flags, cmd_flags;
+	/*
+	 * Do exception processing and return CHECK_CONDITION status to the
+	 * Initiator Port.
+	 */
+	spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+	while (!list_empty_careful(&lun->lun_cmd_list)) {
+		cmd = list_entry(lun->lun_cmd_list.next,
+			struct se_cmd, se_lun_list);
+		list_del(&cmd->se_lun_list);
+
+		if (!(T_TASK(cmd))) {
+			printk(KERN_ERR "ITT: 0x%08x, T_TASK(cmd) = NULL"
+				"[i,t]_state: %u/%u\n",
+				CMD_TFO(cmd)->get_task_tag(cmd),
+				CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
+			BUG();
+		}
+		atomic_set(&T_TASK(cmd)->transport_lun_active, 0);
+		/*
+		 * This will notify iscsi_target_transport.c:
+		 * transport_cmd_check_stop() that a LUN shutdown is in
+		 * progress for the iscsi_cmd_t.
+		 */
+		spin_lock(&T_TASK(cmd)->t_state_lock);
+		DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport"
+			"_lun_stop for  ITT: 0x%08x\n",
+			SE_LUN(cmd)->unpacked_lun,
+			CMD_TFO(cmd)->get_task_tag(cmd));
+		atomic_set(&T_TASK(cmd)->transport_lun_stop, 1);
+		spin_unlock(&T_TASK(cmd)->t_state_lock);
+
+		spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
+
+		if (!(SE_LUN(cmd))) {
+			printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n",
+				CMD_TFO(cmd)->get_task_tag(cmd),
+				CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state);
+			BUG();
+		}
+		/*
+		 * If the Storage engine still owns the iscsi_cmd_t, determine
+		 * and/or stop its context.
+		 */
+		DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
+			"_lun_wait_for_tasks()\n", SE_LUN(cmd)->unpacked_lun,
+			CMD_TFO(cmd)->get_task_tag(cmd));
+
+		if (transport_lun_wait_for_tasks(cmd, SE_LUN(cmd)) < 0) {
+			spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+			continue;
+		}
+
+		DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
+			"_wait_for_tasks(): SUCCESS\n",
+			SE_LUN(cmd)->unpacked_lun,
+			CMD_TFO(cmd)->get_task_tag(cmd));
+
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
+		if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) {
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
+			goto check_cond;
+		}
+		atomic_set(&T_TASK(cmd)->transport_dev_active, 0);
+		transport_all_task_dev_remove_state(cmd);
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
+
+		transport_free_dev_tasks(cmd);
+		/*
+		 * The Storage engine stopped this struct se_cmd before it was
+		 * send to the fabric frontend for delivery back to the
+		 * Initiator Node.  Return this SCSI CDB back with an
+		 * CHECK_CONDITION status.
+		 */
+check_cond:
+		transport_send_check_condition_and_sense(cmd,
+				TCM_NON_EXISTENT_LUN, 0);
+		/*
+		 *  If the fabric frontend is waiting for this iscsi_cmd_t to
+		 * be released, notify the waiting thread now that LU has
+		 * finished accessing it.
+		 */
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags);
+		if (atomic_read(&T_TASK(cmd)->transport_lun_fe_stop)) {
+			DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
+				" struct se_cmd: %p ITT: 0x%08x\n",
+				lun->unpacked_lun,
+				cmd, CMD_TFO(cmd)->get_task_tag(cmd));
+
+			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
+					cmd_flags);
+			transport_cmd_check_stop(cmd, 1, 0);
+			complete(&T_TASK(cmd)->transport_lun_fe_stop_comp);
+			spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+			continue;
+		}
+		DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
+			lun->unpacked_lun, CMD_TFO(cmd)->get_task_tag(cmd));
+
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags);
+		spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
+	}
+	spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
+}
+
+static int transport_clear_lun_thread(void *p)
+{
+	struct se_lun *lun = (struct se_lun *)p;
+
+	__transport_clear_lun_from_sessions(lun);
+	complete(&lun->lun_shutdown_comp);
+
+	return 0;
+}
+
+int transport_clear_lun_from_sessions(struct se_lun *lun)
+{
+	struct task_struct *kt;
+
+	kt = kthread_run(transport_clear_lun_thread, (void *)lun,
+			"tcm_cl_%u", lun->unpacked_lun);
+	if (IS_ERR(kt)) {
+		printk(KERN_ERR "Unable to start clear_lun thread\n");
+		return -1;
+	}
+	wait_for_completion(&lun->lun_shutdown_comp);
+
+	return 0;
+}
+
+/*	transport_generic_wait_for_tasks():
+ *
+ *	Called from frontend or passthrough context to wait for storage engine
+ *	to pause and/or release frontend generated struct se_cmd.
+ */
+static void transport_generic_wait_for_tasks(
+	struct se_cmd *cmd,
+	int remove_cmd,
+	int session_reinstatement)
+{
+	unsigned long flags;
+
+	if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
+		return;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	/*
+	 * If we are already stopped due to an external event (ie: LUN shutdown)
+	 * sleep until the connection can have the passed struct se_cmd back.
+	 * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by
+	 * transport_clear_lun_from_sessions() once the ConfigFS context caller
+	 * has completed its operation on the struct se_cmd.
+	 */
+	if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) {
+
+		DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
+			" wait_for_completion(&T_TASK(cmd)transport_lun_fe"
+			"_stop_comp); for ITT: 0x%08x\n",
+			CMD_TFO(cmd)->get_task_tag(cmd));
+		/*
+		 * There is a special case for WRITES where a FE exception +
+		 * LUN shutdown means ConfigFS context is still sleeping on
+		 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
+		 * We go ahead and up transport_lun_stop_comp just to be sure
+		 * here.
+		 */
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		complete(&T_TASK(cmd)->transport_lun_stop_comp);
+		wait_for_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp);
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+
+		transport_all_task_dev_remove_state(cmd);
+		/*
+		 * At this point, the frontend who was the originator of this
+		 * struct se_cmd, now owns the structure and can be released through
+		 * normal means below.
+		 */
+		DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
+			" wait_for_completion(&T_TASK(cmd)transport_lun_fe_"
+			"stop_comp); for ITT: 0x%08x\n",
+			CMD_TFO(cmd)->get_task_tag(cmd));
+
+		atomic_set(&T_TASK(cmd)->transport_lun_stop, 0);
+	}
+	if (!atomic_read(&T_TASK(cmd)->t_transport_active))
+		goto remove;
+
+	atomic_set(&T_TASK(cmd)->t_transport_stop, 1);
+
+	DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
+		" i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
+		" = TRUE\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd),
+		CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
+		cmd->deferred_t_state);
+
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq);
+
+	wait_for_completion(&T_TASK(cmd)->t_transport_stop_comp);
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	atomic_set(&T_TASK(cmd)->t_transport_active, 0);
+	atomic_set(&T_TASK(cmd)->t_transport_stop, 0);
+
+	DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
+		"&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n",
+		CMD_TFO(cmd)->get_task_tag(cmd));
+remove:
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+	if (!remove_cmd)
+		return;
+
+	transport_generic_free_cmd(cmd, 0, 0, session_reinstatement);
+}
+
+static int transport_get_sense_codes(
+	struct se_cmd *cmd,
+	u8 *asc,
+	u8 *ascq)
+{
+	*asc = cmd->scsi_asc;
+	*ascq = cmd->scsi_ascq;
+
+	return 0;
+}
+
+static int transport_set_sense_codes(
+	struct se_cmd *cmd,
+	u8 asc,
+	u8 ascq)
+{
+	cmd->scsi_asc = asc;
+	cmd->scsi_ascq = ascq;
+
+	return 0;
+}
+
+int transport_send_check_condition_and_sense(
+	struct se_cmd *cmd,
+	u8 reason,
+	int from_transport)
+{
+	unsigned char *buffer = cmd->sense_buffer;
+	unsigned long flags;
+	int offset;
+	u8 asc = 0, ascq = 0;
+
+	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+	if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
+		spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+		return 0;
+	}
+	cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
+	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
+
+	if (!reason && from_transport)
+		goto after_reason;
+
+	if (!from_transport)
+		cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
+	/*
+	 * Data Segment and SenseLength of the fabric response PDU.
+	 *
+	 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
+	 * from include/scsi/scsi_cmnd.h
+	 */
+	offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd,
+				TRANSPORT_SENSE_BUFFER);
+	/*
+	 * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
+	 * SENSE KEY values from include/scsi/scsi.h
+	 */
+	switch (reason) {
+	case TCM_NON_EXISTENT_LUN:
+	case TCM_UNSUPPORTED_SCSI_OPCODE:
+	case TCM_SECTOR_COUNT_TOO_MANY:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ILLEGAL REQUEST */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+		/* INVALID COMMAND OPERATION CODE */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
+		break;
+	case TCM_UNKNOWN_MODE_PAGE:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ILLEGAL REQUEST */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+		/* INVALID FIELD IN CDB */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
+		break;
+	case TCM_CHECK_CONDITION_ABORT_CMD:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ABORTED COMMAND */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+		/* BUS DEVICE RESET FUNCTION OCCURRED */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
+		buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
+		break;
+	case TCM_INCORRECT_AMOUNT_OF_DATA:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ABORTED COMMAND */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+		/* WRITE ERROR */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
+		/* NOT ENOUGH UNSOLICITED DATA */
+		buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
+		break;
+	case TCM_INVALID_CDB_FIELD:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ABORTED COMMAND */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+		/* INVALID FIELD IN CDB */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
+		break;
+	case TCM_INVALID_PARAMETER_LIST:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ABORTED COMMAND */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+		/* INVALID FIELD IN PARAMETER LIST */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
+		break;
+	case TCM_UNEXPECTED_UNSOLICITED_DATA:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ABORTED COMMAND */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+		/* WRITE ERROR */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
+		/* UNEXPECTED_UNSOLICITED_DATA */
+		buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
+		break;
+	case TCM_SERVICE_CRC_ERROR:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ABORTED COMMAND */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+		/* PROTOCOL SERVICE CRC ERROR */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
+		/* N/A */
+		buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
+		break;
+	case TCM_SNACK_REJECTED:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ABORTED COMMAND */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
+		/* READ ERROR */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
+		/* FAILED RETRANSMISSION REQUEST */
+		buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
+		break;
+	case TCM_WRITE_PROTECTED:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* DATA PROTECT */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
+		/* WRITE PROTECTED */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
+		break;
+	case TCM_CHECK_CONDITION_UNIT_ATTENTION:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* UNIT ATTENTION */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
+		core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
+		buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
+		buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
+		break;
+	case TCM_CHECK_CONDITION_NOT_READY:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* Not Ready */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
+		transport_get_sense_codes(cmd, &asc, &ascq);
+		buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
+		buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
+		break;
+	case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
+	default:
+		/* CURRENT ERROR */
+		buffer[offset] = 0x70;
+		/* ILLEGAL REQUEST */
+		buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+		/* LOGICAL UNIT COMMUNICATION FAILURE */
+		buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
+		break;
+	}
+	/*
+	 * This code uses linux/include/scsi/scsi.h SAM status codes!
+	 */
+	cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
+	/*
+	 * Automatically padded, this value is encoded in the fabric's
+	 * data_length response PDU containing the SCSI defined sense data.
+	 */
+	cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
+
+after_reason:
+	CMD_TFO(cmd)->queue_status(cmd);
+	return 0;
+}
+EXPORT_SYMBOL(transport_send_check_condition_and_sense);
+
+int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
+{
+	int ret = 0;
+
+	if (atomic_read(&T_TASK(cmd)->t_transport_aborted) != 0) {
+		if (!(send_status) ||
+		     (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
+			return 1;
+#if 0
+		printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED"
+			" status for CDB: 0x%02x ITT: 0x%08x\n",
+			T_TASK(cmd)->t_task_cdb[0],
+			CMD_TFO(cmd)->get_task_tag(cmd));
+#endif
+		cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
+		CMD_TFO(cmd)->queue_status(cmd);
+		ret = 1;
+	}
+	return ret;
+}
+EXPORT_SYMBOL(transport_check_aborted_status);
+
+void transport_send_task_abort(struct se_cmd *cmd)
+{
+	/*
+	 * If there are still expected incoming fabric WRITEs, we wait
+	 * until until they have completed before sending a TASK_ABORTED
+	 * response.  This response with TASK_ABORTED status will be
+	 * queued back to fabric module by transport_check_aborted_status().
+	 */
+	if (cmd->data_direction == DMA_TO_DEVICE) {
+		if (CMD_TFO(cmd)->write_pending_status(cmd) != 0) {
+			atomic_inc(&T_TASK(cmd)->t_transport_aborted);
+			smp_mb__after_atomic_inc();
+			cmd->scsi_status = SAM_STAT_TASK_ABORTED;
+			transport_new_cmd_failure(cmd);
+			return;
+		}
+	}
+	cmd->scsi_status = SAM_STAT_TASK_ABORTED;
+#if 0
+	printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
+		" ITT: 0x%08x\n", T_TASK(cmd)->t_task_cdb[0],
+		CMD_TFO(cmd)->get_task_tag(cmd));
+#endif
+	CMD_TFO(cmd)->queue_status(cmd);
+}
+
+/*	transport_generic_do_tmr():
+ *
+ *
+ */
+int transport_generic_do_tmr(struct se_cmd *cmd)
+{
+	struct se_cmd *ref_cmd;
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_tmr_req *tmr = cmd->se_tmr_req;
+	int ret;
+
+	switch (tmr->function) {
+	case ABORT_TASK:
+		ref_cmd = tmr->ref_cmd;
+		tmr->response = TMR_FUNCTION_REJECTED;
+		break;
+	case ABORT_TASK_SET:
+	case CLEAR_ACA:
+	case CLEAR_TASK_SET:
+		tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
+		break;
+	case LUN_RESET:
+		ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
+		tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
+					 TMR_FUNCTION_REJECTED;
+		break;
+#if 0
+	case TARGET_WARM_RESET:
+		transport_generic_host_reset(dev->se_hba);
+		tmr->response = TMR_FUNCTION_REJECTED;
+		break;
+	case TARGET_COLD_RESET:
+		transport_generic_host_reset(dev->se_hba);
+		transport_generic_cold_reset(dev->se_hba);
+		tmr->response = TMR_FUNCTION_REJECTED;
+		break;
+#endif
+	default:
+		printk(KERN_ERR "Uknown TMR function: 0x%02x.\n",
+				tmr->function);
+		tmr->response = TMR_FUNCTION_REJECTED;
+		break;
+	}
+
+	cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
+	CMD_TFO(cmd)->queue_tm_rsp(cmd);
+
+	transport_cmd_check_stop(cmd, 2, 0);
+	return 0;
+}
+
+/*
+ *	Called with spin_lock_irq(&dev->execute_task_lock); held
+ *
+ */
+static struct se_task *
+transport_get_task_from_state_list(struct se_device *dev)
+{
+	struct se_task *task;
+
+	if (list_empty(&dev->state_task_list))
+		return NULL;
+
+	list_for_each_entry(task, &dev->state_task_list, t_state_list)
+		break;
+
+	list_del(&task->t_state_list);
+	atomic_set(&task->task_state_active, 0);
+
+	return task;
+}
+
+static void transport_processing_shutdown(struct se_device *dev)
+{
+	struct se_cmd *cmd;
+	struct se_queue_req *qr;
+	struct se_task *task;
+	u8 state;
+	unsigned long flags;
+	/*
+	 * Empty the struct se_device's struct se_task state list.
+	 */
+	spin_lock_irqsave(&dev->execute_task_lock, flags);
+	while ((task = transport_get_task_from_state_list(dev))) {
+		if (!(TASK_CMD(task))) {
+			printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
+			continue;
+		}
+		cmd = TASK_CMD(task);
+
+		if (!T_TASK(cmd)) {
+			printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
+				" %p ITT: 0x%08x\n", task, cmd,
+				CMD_TFO(cmd)->get_task_tag(cmd));
+			continue;
+		}
+		spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+
+		spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+
+		DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
+			" i_state/def_i_state: %d/%d, t_state/def_t_state:"
+			" %d/%d cdb: 0x%02x\n", cmd, task,
+			CMD_TFO(cmd)->get_task_tag(cmd), cmd->cmd_sn,
+			CMD_TFO(cmd)->get_cmd_state(cmd), cmd->deferred_i_state,
+			cmd->t_state, cmd->deferred_t_state,
+			T_TASK(cmd)->t_task_cdb[0]);
+		DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
+			" %d t_task_cdbs_sent: %d -- t_transport_active: %d"
+			" t_transport_stop: %d t_transport_sent: %d\n",
+			CMD_TFO(cmd)->get_task_tag(cmd),
+			T_TASK(cmd)->t_task_cdbs,
+			atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
+			atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
+			atomic_read(&T_TASK(cmd)->t_transport_active),
+			atomic_read(&T_TASK(cmd)->t_transport_stop),
+			atomic_read(&T_TASK(cmd)->t_transport_sent));
+
+		if (atomic_read(&task->task_active)) {
+			atomic_set(&task->task_stop, 1);
+			spin_unlock_irqrestore(
+				&T_TASK(cmd)->t_state_lock, flags);
+
+			DEBUG_DO("Waiting for task: %p to shutdown for dev:"
+				" %p\n", task, dev);
+			wait_for_completion(&task->task_stop_comp);
+			DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
+				task, dev);
+
+			spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
+			atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
+
+			atomic_set(&task->task_active, 0);
+			atomic_set(&task->task_stop, 0);
+		}
+		__transport_stop_task_timer(task, &flags);
+
+		if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) {
+			spin_unlock_irqrestore(
+					&T_TASK(cmd)->t_state_lock, flags);
+
+			DEBUG_DO("Skipping task: %p, dev: %p for"
+				" t_task_cdbs_ex_left: %d\n", task, dev,
+				atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left));
+
+			spin_lock_irqsave(&dev->execute_task_lock, flags);
+			continue;
+		}
+
+		if (atomic_read(&T_TASK(cmd)->t_transport_active)) {
+			DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
+					" %p\n", task, dev);
+
+			if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+				spin_unlock_irqrestore(
+					&T_TASK(cmd)->t_state_lock, flags);
+				transport_send_check_condition_and_sense(
+					cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
+					0);
+				transport_remove_cmd_from_queue(cmd,
+					SE_DEV(cmd)->dev_queue_obj);
+
+				transport_lun_remove_cmd(cmd);
+				transport_cmd_check_stop(cmd, 1, 0);
+			} else {
+				spin_unlock_irqrestore(
+					&T_TASK(cmd)->t_state_lock, flags);
+
+				transport_remove_cmd_from_queue(cmd,
+					SE_DEV(cmd)->dev_queue_obj);
+
+				transport_lun_remove_cmd(cmd);
+
+				if (transport_cmd_check_stop(cmd, 1, 0))
+					transport_generic_remove(cmd, 0, 0);
+			}
+
+			spin_lock_irqsave(&dev->execute_task_lock, flags);
+			continue;
+		}
+		DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
+				task, dev);
+
+		if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+			spin_unlock_irqrestore(
+				&T_TASK(cmd)->t_state_lock, flags);
+			transport_send_check_condition_and_sense(cmd,
+				TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+			transport_remove_cmd_from_queue(cmd,
+				SE_DEV(cmd)->dev_queue_obj);
+
+			transport_lun_remove_cmd(cmd);
+			transport_cmd_check_stop(cmd, 1, 0);
+		} else {
+			spin_unlock_irqrestore(
+				&T_TASK(cmd)->t_state_lock, flags);
+
+			transport_remove_cmd_from_queue(cmd,
+				SE_DEV(cmd)->dev_queue_obj);
+			transport_lun_remove_cmd(cmd);
+
+			if (transport_cmd_check_stop(cmd, 1, 0))
+				transport_generic_remove(cmd, 0, 0);
+		}
+
+		spin_lock_irqsave(&dev->execute_task_lock, flags);
+	}
+	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+	/*
+	 * Empty the struct se_device's struct se_cmd list.
+	 */
+	spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+	while ((qr = __transport_get_qr_from_queue(dev->dev_queue_obj))) {
+		spin_unlock_irqrestore(
+				&dev->dev_queue_obj->cmd_queue_lock, flags);
+		cmd = (struct se_cmd *)qr->cmd;
+		state = qr->state;
+		kfree(qr);
+
+		DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
+				cmd, state);
+
+		if (atomic_read(&T_TASK(cmd)->t_fe_count)) {
+			transport_send_check_condition_and_sense(cmd,
+				TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
+
+			transport_lun_remove_cmd(cmd);
+			transport_cmd_check_stop(cmd, 1, 0);
+		} else {
+			transport_lun_remove_cmd(cmd);
+			if (transport_cmd_check_stop(cmd, 1, 0))
+				transport_generic_remove(cmd, 0, 0);
+		}
+		spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags);
+	}
+	spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags);
+}
+
+/*	transport_processing_thread():
+ *
+ *
+ */
+static int transport_processing_thread(void *param)
+{
+	int ret, t_state;
+	struct se_cmd *cmd;
+	struct se_device *dev = (struct se_device *) param;
+	struct se_queue_req *qr;
+
+	set_user_nice(current, -20);
+
+	while (!kthread_should_stop()) {
+		ret = wait_event_interruptible(dev->dev_queue_obj->thread_wq,
+				atomic_read(&dev->dev_queue_obj->queue_cnt) ||
+				kthread_should_stop());
+		if (ret < 0)
+			goto out;
+
+		spin_lock_irq(&dev->dev_status_lock);
+		if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
+			spin_unlock_irq(&dev->dev_status_lock);
+			transport_processing_shutdown(dev);
+			continue;
+		}
+		spin_unlock_irq(&dev->dev_status_lock);
+
+get_cmd:
+		__transport_execute_tasks(dev);
+
+		qr = transport_get_qr_from_queue(dev->dev_queue_obj);
+		if (!(qr))
+			continue;
+
+		cmd = (struct se_cmd *)qr->cmd;
+		t_state = qr->state;
+		kfree(qr);
+
+		switch (t_state) {
+		case TRANSPORT_NEW_CMD_MAP:
+			if (!(CMD_TFO(cmd)->new_cmd_map)) {
+				printk(KERN_ERR "CMD_TFO(cmd)->new_cmd_map is"
+					" NULL for TRANSPORT_NEW_CMD_MAP\n");
+				BUG();
+			}
+			ret = CMD_TFO(cmd)->new_cmd_map(cmd);
+			if (ret < 0) {
+				cmd->transport_error_status = ret;
+				transport_generic_request_failure(cmd, NULL,
+						0, (cmd->data_direction !=
+						    DMA_TO_DEVICE));
+				break;
+			}
+			/* Fall through */
+		case TRANSPORT_NEW_CMD:
+			ret = transport_generic_new_cmd(cmd);
+			if (ret < 0) {
+				cmd->transport_error_status = ret;
+				transport_generic_request_failure(cmd, NULL,
+					0, (cmd->data_direction !=
+					 DMA_TO_DEVICE));
+			}
+			break;
+		case TRANSPORT_PROCESS_WRITE:
+			transport_generic_process_write(cmd);
+			break;
+		case TRANSPORT_COMPLETE_OK:
+			transport_stop_all_task_timers(cmd);
+			transport_generic_complete_ok(cmd);
+			break;
+		case TRANSPORT_REMOVE:
+			transport_generic_remove(cmd, 1, 0);
+			break;
+		case TRANSPORT_PROCESS_TMR:
+			transport_generic_do_tmr(cmd);
+			break;
+		case TRANSPORT_COMPLETE_FAILURE:
+			transport_generic_request_failure(cmd, NULL, 1, 1);
+			break;
+		case TRANSPORT_COMPLETE_TIMEOUT:
+			transport_stop_all_task_timers(cmd);
+			transport_generic_request_timeout(cmd);
+			break;
+		default:
+			printk(KERN_ERR "Unknown t_state: %d deferred_t_state:"
+				" %d for ITT: 0x%08x i_state: %d on SE LUN:"
+				" %u\n", t_state, cmd->deferred_t_state,
+				CMD_TFO(cmd)->get_task_tag(cmd),
+				CMD_TFO(cmd)->get_cmd_state(cmd),
+				SE_LUN(cmd)->unpacked_lun);
+			BUG();
+		}
+
+		goto get_cmd;
+	}
+
+out:
+	transport_release_all_cmds(dev);
+	dev->process_thread = NULL;
+	return 0;
+}
diff --git a/drivers/target/target_core_ua.c b/drivers/target/target_core_ua.c
new file mode 100644
index 0000000..a2ef346
--- /dev/null
+++ b/drivers/target/target_core_ua.c
@@ -0,0 +1,332 @@
+/*******************************************************************************
+ * Filename: target_core_ua.c
+ *
+ * This file contains logic for SPC-3 Unit Attention emulation
+ *
+ * Copyright (c) 2009,2010 Rising Tide Systems
+ * Copyright (c) 2009,2010 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_fabric_ops.h>
+#include <target/target_core_configfs.h>
+
+#include "target_core_alua.h"
+#include "target_core_hba.h"
+#include "target_core_pr.h"
+#include "target_core_ua.h"
+
+int core_scsi3_ua_check(
+	struct se_cmd *cmd,
+	unsigned char *cdb)
+{
+	struct se_dev_entry *deve;
+	struct se_session *sess = cmd->se_sess;
+	struct se_node_acl *nacl;
+
+	if (!(sess))
+		return 0;
+
+	nacl = sess->se_node_acl;
+	if (!(nacl))
+		return 0;
+
+	deve = &nacl->device_list[cmd->orig_fe_lun];
+	if (!(atomic_read(&deve->ua_count)))
+		return 0;
+	/*
+	 * From sam4r14, section 5.14 Unit attention condition:
+	 *
+	 * a) if an INQUIRY command enters the enabled command state, the
+	 *    device server shall process the INQUIRY command and shall neither
+	 *    report nor clear any unit attention condition;
+	 * b) if a REPORT LUNS command enters the enabled command state, the
+	 *    device server shall process the REPORT LUNS command and shall not
+	 *    report any unit attention condition;
+	 * e) if a REQUEST SENSE command enters the enabled command state while
+	 *    a unit attention condition exists for the SCSI initiator port
+	 *    associated with the I_T nexus on which the REQUEST SENSE command
+	 *    was received, then the device server shall process the command
+	 *    and either:
+	 */
+	switch (cdb[0]) {
+	case INQUIRY:
+	case REPORT_LUNS:
+	case REQUEST_SENSE:
+		return 0;
+	default:
+		return -1;
+	}
+
+	return -1;
+}
+
+int core_scsi3_ua_allocate(
+	struct se_node_acl *nacl,
+	u32 unpacked_lun,
+	u8 asc,
+	u8 ascq)
+{
+	struct se_dev_entry *deve;
+	struct se_ua *ua, *ua_p, *ua_tmp;
+	/*
+	 * PASSTHROUGH OPS
+	 */
+	if (!(nacl))
+		return -1;
+
+	ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC);
+	if (!(ua)) {
+		printk(KERN_ERR "Unable to allocate struct se_ua\n");
+		return -1;
+	}
+	INIT_LIST_HEAD(&ua->ua_dev_list);
+	INIT_LIST_HEAD(&ua->ua_nacl_list);
+
+	ua->ua_nacl = nacl;
+	ua->ua_asc = asc;
+	ua->ua_ascq = ascq;
+
+	spin_lock_irq(&nacl->device_list_lock);
+	deve = &nacl->device_list[unpacked_lun];
+
+	spin_lock(&deve->ua_lock);
+	list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) {
+		/*
+		 * Do not report the same UNIT ATTENTION twice..
+		 */
+		if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) {
+			spin_unlock(&deve->ua_lock);
+			spin_unlock_irq(&nacl->device_list_lock);
+			kmem_cache_free(se_ua_cache, ua);
+			return 0;
+		}
+		/*
+		 * Attach the highest priority Unit Attention to
+		 * the head of the list following sam4r14,
+		 * Section 5.14 Unit Attention Condition:
+		 *
+		 * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest
+		 * POWER ON OCCURRED or
+		 * DEVICE INTERNAL RESET
+		 * SCSI BUS RESET OCCURRED or
+		 * MICROCODE HAS BEEN CHANGED or
+		 * protocol specific
+		 * BUS DEVICE RESET FUNCTION OCCURRED
+		 * I_T NEXUS LOSS OCCURRED
+		 * COMMANDS CLEARED BY POWER LOSS NOTIFICATION
+		 * all others                                    Lowest
+		 *
+		 * Each of the ASCQ codes listed above are defined in
+		 * the 29h ASC family, see spc4r17 Table D.1
+		 */
+		if (ua_p->ua_asc == 0x29) {
+			if ((asc == 0x29) && (ascq > ua_p->ua_ascq))
+				list_add(&ua->ua_nacl_list,
+						&deve->ua_list);
+			else
+				list_add_tail(&ua->ua_nacl_list,
+						&deve->ua_list);
+		} else if (ua_p->ua_asc == 0x2a) {
+			/*
+			 * Incoming Family 29h ASCQ codes will override
+			 * Family 2AHh ASCQ codes for Unit Attention condition.
+			 */
+			if ((asc == 0x29) || (ascq > ua_p->ua_asc))
+				list_add(&ua->ua_nacl_list,
+					&deve->ua_list);
+			else
+				list_add_tail(&ua->ua_nacl_list,
+						&deve->ua_list);
+		} else
+			list_add_tail(&ua->ua_nacl_list,
+				&deve->ua_list);
+		spin_unlock(&deve->ua_lock);
+		spin_unlock_irq(&nacl->device_list_lock);
+
+		atomic_inc(&deve->ua_count);
+		smp_mb__after_atomic_inc();
+		return 0;
+	}
+	list_add_tail(&ua->ua_nacl_list, &deve->ua_list);
+	spin_unlock(&deve->ua_lock);
+	spin_unlock_irq(&nacl->device_list_lock);
+
+	printk(KERN_INFO "[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:"
+		" 0x%02x, ASCQ: 0x%02x\n",
+		TPG_TFO(nacl->se_tpg)->get_fabric_name(), unpacked_lun,
+		asc, ascq);
+
+	atomic_inc(&deve->ua_count);
+	smp_mb__after_atomic_inc();
+	return 0;
+}
+
+void core_scsi3_ua_release_all(
+	struct se_dev_entry *deve)
+{
+	struct se_ua *ua, *ua_p;
+
+	spin_lock(&deve->ua_lock);
+	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
+		list_del(&ua->ua_nacl_list);
+		kmem_cache_free(se_ua_cache, ua);
+
+		atomic_dec(&deve->ua_count);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&deve->ua_lock);
+}
+
+void core_scsi3_ua_for_check_condition(
+	struct se_cmd *cmd,
+	u8 *asc,
+	u8 *ascq)
+{
+	struct se_device *dev = SE_DEV(cmd);
+	struct se_dev_entry *deve;
+	struct se_session *sess = cmd->se_sess;
+	struct se_node_acl *nacl;
+	struct se_ua *ua = NULL, *ua_p;
+	int head = 1;
+
+	if (!(sess))
+		return;
+
+	nacl = sess->se_node_acl;
+	if (!(nacl))
+		return;
+
+	spin_lock_irq(&nacl->device_list_lock);
+	deve = &nacl->device_list[cmd->orig_fe_lun];
+	if (!(atomic_read(&deve->ua_count))) {
+		spin_unlock_irq(&nacl->device_list_lock);
+		return;
+	}
+	/*
+	 * The highest priority Unit Attentions are placed at the head of the
+	 * struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION +
+	 * sense data for the received CDB.
+	 */
+	spin_lock(&deve->ua_lock);
+	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
+		/*
+		 * For ua_intlck_ctrl code not equal to 00b, only report the
+		 * highest priority UNIT_ATTENTION and ASC/ASCQ without
+		 * clearing it.
+		 */
+		if (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl != 0) {
+			*asc = ua->ua_asc;
+			*ascq = ua->ua_ascq;
+			break;
+		}
+		/*
+		 * Otherwise for the default 00b, release the UNIT ATTENTION
+		 * condition.  Return the ASC/ASCQ of the higest priority UA
+		 * (head of the list) in the outgoing CHECK_CONDITION + sense.
+		 */
+		if (head) {
+			*asc = ua->ua_asc;
+			*ascq = ua->ua_ascq;
+			head = 0;
+		}
+		list_del(&ua->ua_nacl_list);
+		kmem_cache_free(se_ua_cache, ua);
+
+		atomic_dec(&deve->ua_count);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&deve->ua_lock);
+	spin_unlock_irq(&nacl->device_list_lock);
+
+	printk(KERN_INFO "[%s]: %s UNIT ATTENTION condition with"
+		" INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x"
+		" reported ASC: 0x%02x, ASCQ: 0x%02x\n",
+		TPG_TFO(nacl->se_tpg)->get_fabric_name(),
+		(DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl != 0) ? "Reporting" :
+		"Releasing", DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl,
+		cmd->orig_fe_lun, T_TASK(cmd)->t_task_cdb[0], *asc, *ascq);
+}
+
+int core_scsi3_ua_clear_for_request_sense(
+	struct se_cmd *cmd,
+	u8 *asc,
+	u8 *ascq)
+{
+	struct se_dev_entry *deve;
+	struct se_session *sess = cmd->se_sess;
+	struct se_node_acl *nacl;
+	struct se_ua *ua = NULL, *ua_p;
+	int head = 1;
+
+	if (!(sess))
+		return -1;
+
+	nacl = sess->se_node_acl;
+	if (!(nacl))
+		return -1;
+
+	spin_lock_irq(&nacl->device_list_lock);
+	deve = &nacl->device_list[cmd->orig_fe_lun];
+	if (!(atomic_read(&deve->ua_count))) {
+		spin_unlock_irq(&nacl->device_list_lock);
+		return -1;
+	}
+	/*
+	 * The highest priority Unit Attentions are placed at the head of the
+	 * struct se_dev_entry->ua_list.  The First (and hence highest priority)
+	 * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the
+	 * matching struct se_lun.
+	 *
+	 * Once the returning ASC/ASCQ values are set, we go ahead and
+	 * release all of the Unit Attention conditions for the assoicated
+	 * struct se_lun.
+	 */
+	spin_lock(&deve->ua_lock);
+	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
+		if (head) {
+			*asc = ua->ua_asc;
+			*ascq = ua->ua_ascq;
+			head = 0;
+		}
+		list_del(&ua->ua_nacl_list);
+		kmem_cache_free(se_ua_cache, ua);
+
+		atomic_dec(&deve->ua_count);
+		smp_mb__after_atomic_dec();
+	}
+	spin_unlock(&deve->ua_lock);
+	spin_unlock_irq(&nacl->device_list_lock);
+
+	printk(KERN_INFO "[%s]: Released UNIT ATTENTION condition, mapped"
+		" LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x,"
+		" ASCQ: 0x%02x\n", TPG_TFO(nacl->se_tpg)->get_fabric_name(),
+		cmd->orig_fe_lun, *asc, *ascq);
+
+	return (head) ? -1 : 0;
+}
diff --git a/drivers/target/target_core_ua.h b/drivers/target/target_core_ua.h
new file mode 100644
index 0000000..6e6b034
--- /dev/null
+++ b/drivers/target/target_core_ua.h
@@ -0,0 +1,36 @@
+#ifndef TARGET_CORE_UA_H
+
+/*
+ * From spc4r17, Table D.1: ASC and ASCQ Assignement
+ */
+#define ASCQ_29H_POWER_ON_RESET_OR_BUS_DEVICE_RESET_OCCURED	0x00
+#define ASCQ_29H_POWER_ON_OCCURRED				0x01
+#define ASCQ_29H_SCSI_BUS_RESET_OCCURED				0x02
+#define ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED		0x03
+#define ASCQ_29H_DEVICE_INTERNAL_RESET				0x04
+#define ASCQ_29H_TRANSCEIVER_MODE_CHANGED_TO_SINGLE_ENDED	0x05
+#define ASCQ_29H_TRANSCEIVER_MODE_CHANGED_TO_LVD		0x06
+#define ASCQ_29H_NEXUS_LOSS_OCCURRED				0x07
+
+#define ASCQ_2AH_PARAMETERS_CHANGED				0x00
+#define ASCQ_2AH_MODE_PARAMETERS_CHANGED			0x01
+#define ASCQ_2AH_LOG_PARAMETERS_CHANGED				0x02
+#define ASCQ_2AH_RESERVATIONS_PREEMPTED				0x03
+#define ASCQ_2AH_RESERVATIONS_RELEASED				0x04
+#define ASCQ_2AH_REGISTRATIONS_PREEMPTED			0x05
+#define ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED		0x06
+#define ASCQ_2AH_IMPLICT_ASYMMETRIC_ACCESS_STATE_TRANSITION_FAILED 0x07
+#define ASCQ_2AH_PRIORITY_CHANGED				0x08
+
+#define ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS		0x09
+
+extern struct kmem_cache *se_ua_cache;
+
+extern int core_scsi3_ua_check(struct se_cmd *, unsigned char *);
+extern int core_scsi3_ua_allocate(struct se_node_acl *, u32, u8, u8);
+extern void core_scsi3_ua_release_all(struct se_dev_entry *);
+extern void core_scsi3_ua_for_check_condition(struct se_cmd *, u8 *, u8 *);
+extern int core_scsi3_ua_clear_for_request_sense(struct se_cmd *,
+						u8 *, u8 *);
+
+#endif /* TARGET_CORE_UA_H */