drivers/target/target_core_tmr.c - linux - Git at Google

 /*******************************************************************************
  * Filename:  target_core_tmr.c
  *
  * This file contains SPC-3 task management infrastructure
  *
  * (c) Copyright 2009-2013 Datera, Inc.
  *
  * 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/slab.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
 #include <linux/export.h>

 #include <target/target_core_base.h>
 #include <target/target_core_backend.h>
 #include <target/target_core_fabric.h>

 #include "target_core_internal.h"
 #include "target_core_alua.h"
 #include "target_core_pr.h"

 int core_tmr_alloc_req(
 	struct se_cmd *se_cmd,
 	void *fabric_tmr_ptr,
 	u8 function,
 	gfp_t gfp_flags)
 {
 	struct se_tmr_req *tmr;

 	tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
 	if (!tmr) {
 		pr_err("Unable to allocate struct se_tmr_req\n");
 		return -ENOMEM;
 	}

 	se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB;
 	se_cmd->se_tmr_req = tmr;
 	tmr->task_cmd = se_cmd;
 	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
 	tmr->function = function;
 	INIT_LIST_HEAD(&tmr->tmr_list);

 	return 0;
 }
 EXPORT_SYMBOL(core_tmr_alloc_req);

 void core_tmr_release_req(struct se_tmr_req *tmr)
 {
 	struct se_device *dev = tmr->tmr_dev;
 	unsigned long flags;

 	if (dev) {
 		spin_lock_irqsave(&dev->se_tmr_lock, flags);
 		list_del(&tmr->tmr_list);
 		spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
 	}

 	kfree(tmr);
 }

 static void core_tmr_handle_tas_abort(
 	struct se_node_acl *tmr_nacl,
 	struct se_cmd *cmd,
 	int tas)
 {
 	bool remove = true;
 	/*
 	 * TASK ABORTED status (TAS) bit support
 	 */
 	if ((tmr_nacl && (tmr_nacl != cmd->se_sess->se_node_acl)) && tas) {
 		remove = false;
 		transport_send_task_abort(cmd);
 	}

 	transport_cmd_finish_abort(cmd, remove);
 }

 static int target_check_cdb_and_preempt(struct list_head *list,
 		struct se_cmd *cmd)
 {
 	struct t10_pr_registration *reg;

 	if (!list)
 		return 0;
 	list_for_each_entry(reg, list, pr_reg_abort_list) {
 		if (reg->pr_res_key == cmd->pr_res_key)
 			return 0;
 	}

 	return 1;
 }

 void core_tmr_abort_task(
 	struct se_device *dev,
 	struct se_tmr_req *tmr,
 	struct se_session *se_sess)
 {
 	struct se_cmd *se_cmd;
 	unsigned long flags;
 	u64 ref_tag;

 	spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
 	list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {

 		if (dev != se_cmd->se_dev)
 			continue;

 		/* skip task management functions, including tmr->task_cmd */
 		if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
 			continue;

 		ref_tag = se_cmd->tag;
 		if (tmr->ref_task_tag != ref_tag)
 			continue;

 		if (!kref_get_unless_zero(&se_cmd->cmd_kref))
 			continue;

 		printk("ABORT_TASK: Found referenced %s task_tag: %llu\n",
 			se_cmd->se_tfo->get_fabric_name(), ref_tag);

 		spin_lock(&se_cmd->t_state_lock);
 		if (se_cmd->transport_state & CMD_T_COMPLETE) {
 			printk("ABORT_TASK: ref_tag: %llu already complete,"
 			       " skipping\n", ref_tag);
 			spin_unlock(&se_cmd->t_state_lock);
 			spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

 			target_put_sess_cmd(se_cmd);

 			goto out;
 		}
 		se_cmd->transport_state |= CMD_T_ABORTED;
 		spin_unlock(&se_cmd->t_state_lock);

 		list_del_init(&se_cmd->se_cmd_list);
 		spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

 		cancel_work_sync(&se_cmd->work);
 		transport_wait_for_tasks(se_cmd);

 		target_put_sess_cmd(se_cmd);
 		transport_cmd_finish_abort(se_cmd, true);

 		printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
 				" ref_tag: %llu\n", ref_tag);
 		tmr->response = TMR_FUNCTION_COMPLETE;
 		return;
 	}
 	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

 out:
 	printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
 			tmr->ref_task_tag);
 	tmr->response = TMR_TASK_DOES_NOT_EXIST;
 }

 static void core_tmr_drain_tmr_list(
 	struct se_device *dev,
 	struct se_tmr_req *tmr,
 	struct list_head *preempt_and_abort_list)
 {
 	LIST_HEAD(drain_tmr_list);
 	struct se_tmr_req *tmr_p, *tmr_pp;
 	struct se_cmd *cmd;
 	unsigned long flags;
 	/*
 	 * Release all pending and outgoing TMRs aside from the received
 	 * LUN_RESET tmr..
 	 */
 	spin_lock_irqsave(&dev->se_tmr_lock, flags);
 	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_p == tmr)
 			continue;

 		cmd = tmr_p->task_cmd;
 		if (!cmd) {
 			pr_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 registration key matching TMRs.
 		 */
 		if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
 			continue;

 		spin_lock(&cmd->t_state_lock);
 		if (!(cmd->transport_state & CMD_T_ACTIVE)) {
 			spin_unlock(&cmd->t_state_lock);
 			continue;
 		}
 		if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
 			spin_unlock(&cmd->t_state_lock);
 			continue;
 		}
 		spin_unlock(&cmd->t_state_lock);

 		list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
 	}
 	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);

 	list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
 		list_del_init(&tmr_p->tmr_list);
 		cmd = tmr_p->task_cmd;

 		pr_debug("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);

 		transport_cmd_finish_abort(cmd, 1);
 	}
 }

 static void core_tmr_drain_state_list(
 	struct se_device *dev,
 	struct se_cmd *prout_cmd,
 	struct se_node_acl *tmr_nacl,
 	int tas,
 	struct list_head *preempt_and_abort_list)
 {
 	LIST_HEAD(drain_task_list);
 	struct se_cmd *cmd, *next;
 	unsigned long flags;

 	/*
 	 * Complete outstanding commands 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(cmd, next, &dev->state_list, state_list) {
 		/*
 		 * For PREEMPT_AND_ABORT usage, only process commands
 		 * with a matching reservation key.
 		 */
 		if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
 			continue;

 		/*
 		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
 		 */
 		if (prout_cmd == cmd)
 			continue;

 		list_move_tail(&cmd->state_list, &drain_task_list);
 		cmd->state_active = false;
 	}
 	spin_unlock_irqrestore(&dev->execute_task_lock, flags);

 	while (!list_empty(&drain_task_list)) {
 		cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
 		list_del(&cmd->state_list);

 		pr_debug("LUN_RESET: %s cmd: %p"
 			" ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d"
 			"cdb: 0x%02x\n",
 			(preempt_and_abort_list) ? "Preempt" : "", cmd,
 			cmd->tag, 0,
 			cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
 			cmd->t_task_cdb[0]);
 		pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx"
 			" -- CMD_T_ACTIVE: %d"
 			" CMD_T_STOP: %d CMD_T_SENT: %d\n",
 			cmd->tag, cmd->pr_res_key,
 			(cmd->transport_state & CMD_T_ACTIVE) != 0,
 			(cmd->transport_state & CMD_T_STOP) != 0,
 			(cmd->transport_state & CMD_T_SENT) != 0);

 		/*
 		 * If the command may be queued onto a workqueue cancel it now.
 		 *
 		 * This is equivalent to removal from the execute queue in the
 		 * loop above, but we do it down here given that
 		 * cancel_work_sync may block.
 		 */
 		if (cmd->t_state == TRANSPORT_COMPLETE)
 			cancel_work_sync(&cmd->work);

 		spin_lock_irqsave(&cmd->t_state_lock, flags);
 		target_stop_cmd(cmd, &flags);

 		cmd->transport_state |= CMD_T_ABORTED;
 		spin_unlock_irqrestore(&cmd->t_state_lock, flags);

 		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas);
 	}
 }

 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_node_acl *tmr_nacl = NULL;
 	struct se_portal_group *tmr_tpg = NULL;
 	int 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->dev_attrib.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) {
 			pr_debug("LUN_RESET: TMR caller fabric: %s"
 				" initiator port %s\n",
 				tmr_tpg->se_tpg_tfo->get_fabric_name(),
 				tmr_nacl->initiatorname);
 		}
 	}
 	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
 		(preempt_and_abort_list) ? "Preempt" : "TMR",
 		dev->transport->name, tas);

 	core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
 	core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
 				preempt_and_abort_list);

 	/*
 	 * Clear any legacy SPC-2 reservation when called during
 	 * LOGICAL UNIT RESET
 	 */
 	if (!preempt_and_abort_list &&
 	     (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) {
 		spin_lock(&dev->dev_reservation_lock);
 		dev->dev_reserved_node_acl = NULL;
 		dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
 		spin_unlock(&dev->dev_reservation_lock);
 		pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
 	}

 	atomic_long_inc(&dev->num_resets);

 	pr_debug("LUN_RESET: %s for [%s] Complete\n",
 			(preempt_and_abort_list) ? "Preempt" : "TMR",
 			dev->transport->name);
 	return 0;
 }
	/*******************************************************************************
	* Filename: target_core_tmr.c
	*
	* This file contains SPC-3 task management infrastructure
	*
	* (c) Copyright 2009-2013 Datera, Inc.
	*
	* 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/slab.h>
	#include <linux/spinlock.h>
	#include <linux/list.h>
	#include <linux/export.h>

	#include <target/target_core_base.h>
	#include <target/target_core_backend.h>
	#include <target/target_core_fabric.h>

	#include "target_core_internal.h"
	#include "target_core_alua.h"
	#include "target_core_pr.h"

	int core_tmr_alloc_req(
	struct se_cmd *se_cmd,
	void *fabric_tmr_ptr,
	u8 function,
	gfp_t gfp_flags)
	{
	struct se_tmr_req *tmr;

	tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
	if (!tmr) {
	pr_err("Unable to allocate struct se_tmr_req\n");
	return -ENOMEM;
	}

	se_cmd->se_cmd_flags \|= SCF_SCSI_TMR_CDB;
	se_cmd->se_tmr_req = tmr;
	tmr->task_cmd = se_cmd;
	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	tmr->function = function;
	INIT_LIST_HEAD(&tmr->tmr_list);

	return 0;
	}
	EXPORT_SYMBOL(core_tmr_alloc_req);

	void core_tmr_release_req(struct se_tmr_req *tmr)
	{
	struct se_device *dev = tmr->tmr_dev;
	unsigned long flags;

	if (dev) {
	spin_lock_irqsave(&dev->se_tmr_lock, flags);
	list_del(&tmr->tmr_list);
	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
	}

	kfree(tmr);
	}

	static void core_tmr_handle_tas_abort(
	struct se_node_acl *tmr_nacl,
	struct se_cmd *cmd,
	int tas)
	{
	bool remove = true;
	/*
	* TASK ABORTED status (TAS) bit support
	*/
	if ((tmr_nacl && (tmr_nacl != cmd->se_sess->se_node_acl)) && tas) {
	remove = false;
	transport_send_task_abort(cmd);
	}

	transport_cmd_finish_abort(cmd, remove);
	}

	static int target_check_cdb_and_preempt(struct list_head *list,
	struct se_cmd *cmd)
	{
	struct t10_pr_registration *reg;

	if (!list)
	return 0;
	list_for_each_entry(reg, list, pr_reg_abort_list) {
	if (reg->pr_res_key == cmd->pr_res_key)
	return 0;
	}

	return 1;
	}

	void core_tmr_abort_task(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct se_session *se_sess)
	{
	struct se_cmd *se_cmd;
	unsigned long flags;
	u64 ref_tag;

	spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
	list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {

	if (dev != se_cmd->se_dev)
	continue;

	/* skip task management functions, including tmr->task_cmd */
	if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
	continue;

	ref_tag = se_cmd->tag;
	if (tmr->ref_task_tag != ref_tag)
	continue;

	if (!kref_get_unless_zero(&se_cmd->cmd_kref))
	continue;

	printk("ABORT_TASK: Found referenced %s task_tag: %llu\n",
	se_cmd->se_tfo->get_fabric_name(), ref_tag);

	spin_lock(&se_cmd->t_state_lock);
	if (se_cmd->transport_state & CMD_T_COMPLETE) {
	printk("ABORT_TASK: ref_tag: %llu already complete,"
	" skipping\n", ref_tag);
	spin_unlock(&se_cmd->t_state_lock);
	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

	target_put_sess_cmd(se_cmd);

	goto out;
	}
	se_cmd->transport_state \|= CMD_T_ABORTED;
	spin_unlock(&se_cmd->t_state_lock);

	list_del_init(&se_cmd->se_cmd_list);
	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

	cancel_work_sync(&se_cmd->work);
	transport_wait_for_tasks(se_cmd);

	target_put_sess_cmd(se_cmd);
	transport_cmd_finish_abort(se_cmd, true);

	printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
	" ref_tag: %llu\n", ref_tag);
	tmr->response = TMR_FUNCTION_COMPLETE;
	return;
	}
	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

	out:
	printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
	tmr->ref_task_tag);
	tmr->response = TMR_TASK_DOES_NOT_EXIST;
	}

	static void core_tmr_drain_tmr_list(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct list_head *preempt_and_abort_list)
	{
	LIST_HEAD(drain_tmr_list);
	struct se_tmr_req tmr_p, tmr_pp;
	struct se_cmd *cmd;
	unsigned long flags;
	/*
	* Release all pending and outgoing TMRs aside from the received
	* LUN_RESET tmr..
	*/
	spin_lock_irqsave(&dev->se_tmr_lock, flags);
	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_p == tmr)
	continue;

	cmd = tmr_p->task_cmd;
	if (!cmd) {
	pr_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 registration key matching TMRs.
	*/
	if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
	continue;

	spin_lock(&cmd->t_state_lock);
	if (!(cmd->transport_state & CMD_T_ACTIVE)) {
	spin_unlock(&cmd->t_state_lock);
	continue;
	}
	if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
	spin_unlock(&cmd->t_state_lock);
	continue;
	}
	spin_unlock(&cmd->t_state_lock);

	list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
	}
	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);

	list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
	list_del_init(&tmr_p->tmr_list);
	cmd = tmr_p->task_cmd;

	pr_debug("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);

	transport_cmd_finish_abort(cmd, 1);
	}
	}

	static void core_tmr_drain_state_list(
	struct se_device *dev,
	struct se_cmd *prout_cmd,
	struct se_node_acl *tmr_nacl,
	int tas,
	struct list_head *preempt_and_abort_list)
	{
	LIST_HEAD(drain_task_list);
	struct se_cmd cmd, next;
	unsigned long flags;

	/*
	* Complete outstanding commands 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(cmd, next, &dev->state_list, state_list) {
	/*
	* For PREEMPT_AND_ABORT usage, only process commands
	* with a matching reservation key.
	*/
	if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
	continue;

	/*
	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	*/
	if (prout_cmd == cmd)
	continue;

	list_move_tail(&cmd->state_list, &drain_task_list);
	cmd->state_active = false;
	}
	spin_unlock_irqrestore(&dev->execute_task_lock, flags);

	while (!list_empty(&drain_task_list)) {
	cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
	list_del(&cmd->state_list);

	pr_debug("LUN_RESET: %s cmd: %p"
	" ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d"
	"cdb: 0x%02x\n",
	(preempt_and_abort_list) ? "Preempt" : "", cmd,
	cmd->tag, 0,
	cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
	cmd->t_task_cdb[0]);
	pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx"
	" -- CMD_T_ACTIVE: %d"
	" CMD_T_STOP: %d CMD_T_SENT: %d\n",
	cmd->tag, cmd->pr_res_key,
	(cmd->transport_state & CMD_T_ACTIVE) != 0,
	(cmd->transport_state & CMD_T_STOP) != 0,
	(cmd->transport_state & CMD_T_SENT) != 0);

	/*
	* If the command may be queued onto a workqueue cancel it now.
	*
	* This is equivalent to removal from the execute queue in the
	* loop above, but we do it down here given that
	* cancel_work_sync may block.
	*/
	if (cmd->t_state == TRANSPORT_COMPLETE)
	cancel_work_sync(&cmd->work);

	spin_lock_irqsave(&cmd->t_state_lock, flags);
	target_stop_cmd(cmd, &flags);

	cmd->transport_state \|= CMD_T_ABORTED;
	spin_unlock_irqrestore(&cmd->t_state_lock, flags);

	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas);
	}
	}

	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_node_acl *tmr_nacl = NULL;
	struct se_portal_group *tmr_tpg = NULL;
	int 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->dev_attrib.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) {
	pr_debug("LUN_RESET: TMR caller fabric: %s"
	" initiator port %s\n",
	tmr_tpg->se_tpg_tfo->get_fabric_name(),
	tmr_nacl->initiatorname);
	}
	}
	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
	(preempt_and_abort_list) ? "Preempt" : "TMR",
	dev->transport->name, tas);

	core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
	core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
	preempt_and_abort_list);

	/*
	* Clear any legacy SPC-2 reservation when called during
	* LOGICAL UNIT RESET
	*/
	if (!preempt_and_abort_list &&
	(dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) {
	spin_lock(&dev->dev_reservation_lock);
	dev->dev_reserved_node_acl = NULL;
	dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
	spin_unlock(&dev->dev_reservation_lock);
	pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
	}

	atomic_long_inc(&dev->num_resets);

	pr_debug("LUN_RESET: %s for [%s] Complete\n",
	(preempt_and_abort_list) ? "Preempt" : "TMR",
	dev->transport->name);
	return 0;
	}