Message-Id: <1238904138.4250.758.camel@haakon2.linux-iscsi.org>
Date:	Sat, 04 Apr 2009 21:02:18 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	LKML <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hannes Reinecke <hare@...e.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Ming Zhang <blackmagic02881@...il.com>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [RFC PATCH 17/19] Target_Core_Mod portal group endpoint
	infrastructure

The patch adds the core se_portal_group_t functionality that is used internally by
target_core_mod, as well as ConfigFS enabled fabric modules like LIO-Target v3.0
(iscsi_target_mod).

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>

diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
new file mode 100644
index 0000000..e97b1dc
--- /dev/null
+++ b/drivers/target/target_core_tpg.c
@@ -0,0 +1,867 @@
+/*******************************************************************************
+ * 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) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.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.
+ *
+ ******************************************************************************/
+
+
+#define TARGET_CORE_TPG_C
+
+#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_hba.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_plugin.h>
+#include <target/target_core_seobj.h>
+#include <target/target_core_fabric_ops.h>
+
+#undef TARGET_CORE_TPG_C
+
+/*	core_clear_initiator_node_from_tpg():
+ *
+ *
+ */
+static void core_clear_initiator_node_from_tpg(
+	se_node_acl_t *nacl,
+	se_portal_group_t *tpg)
+{
+	int i;
+	se_dev_entry_t *deve;
+	se_lun_t *lun;
+	se_lun_acl_t *acl, *acl_tmp;
+
+	spin_lock_bh(&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_bh(&nacl->device_list_lock);
+		core_update_device_list_for_node(lun, 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 se_lun_acl_t for %s,"
+				" mapped_lun: %u\n", nacl->initiatorname,
+				deve->mapped_lun);
+			spin_unlock(&lun->lun_acl_lock);
+			spin_lock_bh(&nacl->device_list_lock);
+			continue;
+		}
+
+		list_del(&acl->lacl_list);
+		spin_unlock(&lun->lun_acl_lock);
+
+		spin_lock_bh(&nacl->device_list_lock);
+		kfree(acl);
+	}
+	spin_unlock_bh(&nacl->device_list_lock);
+}
+
+/*	__core_tpg_get_initiator_node_acl():
+ *
+ *	spin_lock_bh(&tpg->acl_node_lock); must be held when calling
+ */
+static se_node_acl_t *__core_tpg_get_initiator_node_acl(
+	se_portal_group_t *tpg,
+	const char *initiatorname)
+{
+	se_node_acl_t *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():
+ *
+ *
+ */
+se_node_acl_t *core_tpg_get_initiator_node_acl(
+	se_portal_group_t *tpg,
+	unsigned char *initiatorname)
+{
+	se_node_acl_t *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->nodeacl_flags & NAF_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(
+	se_node_acl_t *acl,
+	se_portal_group_t *tpg)
+{
+	int i = 0;
+	u32 lun_access = 0;
+	se_lun_t *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)
+			continue;
+
+		spin_unlock(&tpg->tpg_lun_lock);
+		/*
+		 * 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 (LUN_OBJ_API(lun)->get_device_access) {
+				if (LUN_OBJ_API(lun)->get_device_access(
+						lun->lun_type_ptr) == 0)
+					lun_access =
+						TRANSPORT_LUNFLAGS_READ_ONLY;
+				else
+					lun_access =
+						TRANSPORT_LUNFLAGS_READ_WRITE;
+			} else
+				lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
+		} else {
+			/*
+			 * Allow only optical drives to issue R/W in default RO
+			 * demo mode.
+			 */
+			if (LUN_OBJ_API(lun)->get_device_type(
+					lun->lun_type_ptr) == 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, 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(
+	se_portal_group_t *tpg,
+	se_node_acl_t *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(se_node_acl_t *nacl)
+{
+	se_dev_entry_t *deve;
+	int i;
+
+	nacl->device_list = kzalloc(sizeof(se_dev_entry_t) *
+				TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
+	if (!(nacl->device_list)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+			" se_node_acl_t->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);
+		spin_lock_init(&deve->ua_lock);
+		INIT_LIST_HEAD(&deve->ua_list);
+	}
+
+	return 0;
+}
+
+/*	core_tpg_check_initiator_node_acl()
+ *
+ *
+ */
+se_node_acl_t *core_tpg_check_initiator_node_acl(
+	se_portal_group_t *tpg,
+	unsigned char *initiatorname)
+{
+	se_node_acl_t *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 = kzalloc(sizeof(se_node_acl_t), GFP_KERNEL);
+	if (!(acl)) {
+		printk(KERN_ERR "Unable to allocate memory for"
+			" se_node_acl_t.\n");
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&acl->acl_list);
+	spin_lock_init(&acl->device_list_lock);
+	spin_lock_init(&acl->nacl_sess_lock);
+	acl->queue_depth = TPG_TFO(tpg)->tpg_get_default_depth(tpg);
+	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
+	acl->se_tpg = tpg;
+#ifdef SNMP_SUPPORT
+	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
+	spin_lock_init(&acl->stats_lock);
+#endif /* SNMP_SUPPORT */
+	acl->nodeacl_flags |= NAF_DYNAMIC_NODE_ACL;
+
+	acl->fabric_acl_ptr = TPG_TFO(tpg)->tpg_alloc_fabric_acl(tpg,
+			acl);
+	if (!(acl->fabric_acl_ptr)) {
+		kfree(acl);
+		return NULL;
+	}
+	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);
+		kfree(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);
+		kfree(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);
+
+/*	core_tpg_free_node_acls():
+ *
+ *
+ */
+void core_tpg_free_node_acls(se_portal_group_t *tpg)
+{
+	se_node_acl_t *acl, *acl_tmp;
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	list_for_each_entry_safe(acl, acl_tmp, &tpg->acl_node_list, acl_list) {
+		/*
+		 * The kfree() for dynamically allocated Node ACLS is done in
+		 * iscsi_close_session().
+		 */
+		if (acl->nodeacl_flags & NAF_DYNAMIC_NODE_ACL)
+			continue;
+
+		kfree(acl);
+		tpg->num_node_acls--;
+	}
+	spin_unlock_bh(&tpg->acl_node_lock);
+}
+EXPORT_SYMBOL(core_tpg_free_node_acls);
+
+void core_tpg_clear_object_luns(se_portal_group_t *tpg)
+{
+	int i, ret;
+	se_lun_t *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_type_ptr == NULL))
+			continue;
+
+		spin_unlock(&tpg->tpg_lun_lock);
+		ret = LUN_OBJ_API(lun)->del_obj_from_lun(tpg, 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():
+ *
+ *
+ */
+se_node_acl_t *core_tpg_add_initiator_node_acl(
+	se_portal_group_t *tpg,
+	const char *initiatorname,
+	u32 queue_depth)
+{
+	se_node_acl_t *acl = NULL;
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
+	if ((acl)) {
+		if (acl->nodeacl_flags & NAF_DYNAMIC_NODE_ACL) {
+			acl->nodeacl_flags &= ~NAF_DYNAMIC_NODE_ACL;
+			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);
+			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);
+
+	acl = kzalloc(sizeof(se_node_acl_t), GFP_KERNEL);
+	if (!(acl)) {
+		printk(KERN_ERR "Unable to allocate memory for senode_acl_t.\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	INIT_LIST_HEAD(&acl->acl_list);
+	spin_lock_init(&acl->device_list_lock);
+	spin_lock_init(&acl->nacl_sess_lock);
+	acl->queue_depth = queue_depth;
+	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
+	acl->se_tpg = tpg;
+#ifdef SNMP_SUPPORT
+	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
+	spin_lock_init(&acl->stats_lock);
+#endif /* SNMP_SUPPORT */
+
+	acl->fabric_acl_ptr = TPG_TFO(tpg)->tpg_alloc_fabric_acl(tpg,
+			acl);
+	if (!(acl->fabric_acl_ptr)) {
+		kfree(acl);
+		return ERR_PTR(-ENOMEM);
+	}
+	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);
+		kfree(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);
+		kfree(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(
+	se_portal_group_t *tpg,
+	const char *initiatorname,
+	int force)
+{
+	se_session_t *sess, *init_sess = NULL;
+	se_node_acl_t *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 -EINVAL;
+	}
+	if (acl->nodeacl_flags & NAF_DYNAMIC_NODE_ACL) {
+		acl->nodeacl_flags &= ~NAF_DYNAMIC_NODE_ACL;
+		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 delete Access Control List"
+				" for %s Initiator Node: %s while session is"
+				" operational.  To forcefully delete the"
+				" session 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->nodeacl_flags |= NAF_DYNAMIC_NODE_ACL;
+			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;
+	}
+	spin_unlock_bh(&tpg->session_lock);
+
+	spin_lock_bh(&tpg->acl_node_lock);
+	list_del(&acl->acl_list);
+	tpg->num_node_acls--;
+	spin_unlock_bh(&tpg->acl_node_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);
+
+	core_clear_initiator_node_from_tpg(acl, tpg);
+	core_free_device_list_for_node(acl, tpg);
+
+	TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
+	acl->fabric_acl_ptr = NULL;
+
+	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(), initiatorname);
+
+	kfree(acl);
+	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(
+	se_portal_group_t *tpg,
+	unsigned char *initiatorname,
+	u32 queue_depth,
+	int force)
+{
+	se_session_t *sess, *init_sess = NULL;
+	se_node_acl_t *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->nodeacl_flags & NAF_DYNAMIC_NODE_ACL) {
+		acl->nodeacl_flags &= ~NAF_DYNAMIC_NODE_ACL;
+		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->nodeacl_flags |= NAF_DYNAMIC_NODE_ACL;
+			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 se_node_acl_t, 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->nodeacl_flags |= NAF_DYNAMIC_NODE_ACL;
+		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->nodeacl_flags |= NAF_DYNAMIC_NODE_ACL;
+	spin_unlock_bh(&tpg->acl_node_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
+
+se_portal_group_t *core_tpg_register(
+	struct target_core_fabric_ops *tfo,
+	void *tpg_fabric_ptr,
+	int se_tpg_type)
+{
+	se_lun_t *lun;
+	se_portal_group_t *se_tpg;
+	u32 i;
+
+	se_tpg = kzalloc(sizeof(se_portal_group_t), GFP_KERNEL);
+	if (!(se_tpg)) {
+		printk(KERN_ERR "Unable to allocate se_portal_group_t\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	se_tpg->tpg_lun_list = kzalloc((sizeof(se_lun_t) *
+				TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
+	if (!(se_tpg->tpg_lun_list)) {
+		printk(KERN_ERR "Unable to allocate se_portal_group_t->"
+				"tpg_lun_list\n");
+		kfree(se_tpg);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+		lun = &se_tpg->tpg_lun_list[i];
+		lun->unpacked_lun = i;
+		lun->lun_type_ptr = NULL;
+		lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
+		atomic_set(&lun->lun_acl_count, 0);
+		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;
+	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);
+
+	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 se_portal_group_t 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 se_tpg;
+}
+EXPORT_SYMBOL(core_tpg_register);
+
+int core_tpg_deregister(se_portal_group_t *se_tpg)
+{
+	printk(KERN_INFO "TARGET_CORE[%s]: Deallocating %s se_portal_group_t"
+		" 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);
+
+	se_tpg->se_tpg_fabric_ptr = NULL;
+	kfree(se_tpg->tpg_lun_list);
+	kfree(se_tpg);
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_deregister);
+
+se_lun_t *core_tpg_pre_addlun(
+	se_portal_group_t *tpg,
+	u32 unpacked_lun)
+{
+	se_lun_t *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;
+}
+EXPORT_SYMBOL(core_tpg_pre_addlun);
+
+int core_tpg_post_addlun(
+	se_portal_group_t *tpg,
+	se_lun_t *lun,
+	int lun_type,
+	u32 lun_access,
+	void *lun_ptr,
+	struct se_obj_lun_type_s *obj_api)
+{
+	lun->lun_obj_api = obj_api;
+	lun->lun_type_ptr = lun_ptr;
+	if (LUN_OBJ_API(lun)->export_obj(lun_ptr, tpg, lun) < 0) {
+		lun->lun_type_ptr = NULL;
+		lun->lun_obj_api = NULL;
+		return -1;
+	}
+
+	spin_lock(&tpg->tpg_lun_lock);
+	lun->lun_access = lun_access;
+	lun->lun_type = lun_type;
+	lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_post_addlun);
+
+se_lun_t *core_tpg_pre_dellun(
+	se_portal_group_t *tpg,
+	u32 unpacked_lun,
+	int lun_type,
+	int *ret)
+{
+	se_lun_t *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);
+	}
+
+	if (lun->lun_type != lun_type) {
+		printk(KERN_ERR "%s Logical Unit Number: %u type: %d does not"
+			" match passed type: %d\n",
+			TPG_TFO(tpg)->get_fabric_name(),
+			unpacked_lun, lun->lun_type, lun_type);
+		spin_unlock(&tpg->tpg_lun_lock);
+		return ERR_PTR(-EINVAL);
+	}
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	core_clear_lun_from_tpg(lun, tpg);
+
+	return lun;
+}
+EXPORT_SYMBOL(core_tpg_pre_dellun);
+
+int core_tpg_post_dellun(
+	se_portal_group_t *tpg,
+	se_lun_t *lun)
+{
+	se_lun_acl_t *acl, *acl_tmp;
+
+	transport_clear_lun_from_sessions(lun);
+
+	LUN_OBJ_API(lun)->unexport_obj(lun->lun_type_ptr, tpg, lun);
+	LUN_OBJ_API(lun)->release_obj(lun->lun_type_ptr);
+
+	spin_lock(&tpg->tpg_lun_lock);
+	lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
+	lun->lun_type = 0;
+	lun->lun_type_ptr = NULL;
+	spin_unlock(&tpg->tpg_lun_lock);
+
+	spin_lock(&lun->lun_acl_lock);
+	list_for_each_entry_safe(acl, acl_tmp, &lun->lun_acl_list, lacl_list) {
+		kfree(acl);
+	}
+	spin_unlock(&lun->lun_acl_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(core_tpg_post_dellun);
diff --git a/include/target/target_core_tpg.h b/include/target/target_core_tpg.h
new file mode 100644
index 0000000..9532d29
--- /dev/null
+++ b/include/target/target_core_tpg.h
@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * Filename:  target_core_tpg.h
+ *
+ * This file contains generic Target Portal Group related definitions.
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.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.
+ *
+ ******************************************************************************/
+
+
+#ifndef TARGET_CORE_TPG_H
+#define TARGET_CORE_TPG_H
+
+extern se_global_t *se_global;
+
+extern se_node_acl_t *core_tpg_get_initiator_node_acl(se_portal_group_t *tpg,
+						unsigned char *);
+extern void core_tpg_add_node_to_devs(struct se_node_acl_s *,
+						struct se_portal_group_s *);
+extern struct se_node_acl_s *core_tpg_check_initiator_node_acl(
+						struct se_portal_group_s *,
+						unsigned char *);
+extern void core_tpg_free_node_acls(struct se_portal_group_s *);
+extern void core_tpg_clear_object_luns(struct se_portal_group_s *);
+extern se_node_acl_t *core_tpg_add_initiator_node_acl(se_portal_group_t *,
+						const char *, u32);
+extern int core_tpg_del_initiator_node_acl(se_portal_group_t *,
+						const char *, int);
+extern int core_tpg_set_initiator_node_queue_depth(se_portal_group_t *,
+						unsigned char *, u32, int);
+extern se_portal_group_t *core_tpg_register(struct target_core_fabric_ops *,
+					void *, int);
+extern int core_tpg_deregister(struct se_portal_group_s *);
+extern se_lun_t *core_tpg_pre_addlun(se_portal_group_t *, u32);
+extern int core_tpg_post_addlun(se_portal_group_t *, se_lun_t *, int, u32,
+				void *, struct se_obj_lun_type_s *);
+extern se_lun_t *core_tpg_pre_dellun(se_portal_group_t *, u32, int, int *);
+extern int core_tpg_post_dellun(se_portal_group_t *, se_lun_t *);
+
+#endif /* TARGET_CORE_TPG_H */



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