target_core_pr.c 129 KB
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/*******************************************************************************
 * 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)
{
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	if (!pr_reg->isid_present_at_reg)
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		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;

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	if (!sess)
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		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);
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		return -EINVAL;
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	}
	if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
		spin_unlock(&dev->dev_reservation_lock);
		return 0;
	}
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	ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
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	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;

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	if (!sess || !tpg)
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		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;
	}
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	pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
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		" MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
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		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;

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	if ((cmd->t_task_cdb[1] & 0x01) &&
	    (cmd->t_task_cdb[1] & 0x02)) {
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		pr_err("LongIO and Obselete Bits set, returning"
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				" ILLEGAL_REQUEST\n");
		return PYX_TRANSPORT_ILLEGAL_REQUEST;
	}
	/*
	 * This is currently the case for target_core_mod passthrough struct se_cmd
	 * ops
	 */
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	if (!sess || !tpg)
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		return 0;

	spin_lock(&dev->dev_reservation_lock);
	if (dev->dev_reserved_node_acl &&
	   (dev->dev_reserved_node_acl != sess->se_node_acl)) {
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		pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
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			tpg->se_tpg_tfo->get_fabric_name());
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		pr_err("Original reserver LUN: %u %s\n",
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			cmd->se_lun->unpacked_lun,
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			dev->dev_reserved_node_acl->initiatorname);
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		pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
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			" from %s \n", cmd->se_lun->unpacked_lun,
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			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;
	}
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	pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
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		" for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
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		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;
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	struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
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	unsigned char *cdb = &cmd->t_task_cdb[0];
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	int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
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	int conflict = 0;

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	if (!se_sess)
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		return 0;

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	if (!crh)
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		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) {
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		pr_err("Received legacy SPC-2 RESERVE/RELEASE"
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			" 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;
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	struct se_session *se_sess = cmd->se_sess;
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	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:
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		return -EINVAL;
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	}
	/*
	 * 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:
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			pr_err("Unknown PERSISTENT_RESERVE_OUT service"
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				" action: 0x%02x\n", cdb[1] & 0x1f);
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			return -EINVAL;
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		}
		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:
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			pr_err("Unknown MI Service Action: 0x%02x\n",
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				(cdb[1] & 0x1f));
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			return -EINVAL;
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		}
		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;
	}
	/*
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Lucas De Marchi committed
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	 * Case where the CDB is explicitly allowed in the above switch
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	 * statement.
	 */
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	if (!ret && !other_cdb) {
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#if 0
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		pr_debug("Allowing explict CDB: 0x%02x for %s"
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			" 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
			 */
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			pr_debug("%s Conflict for unregistered nexus"
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				" %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
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			if (!registered_nexus) {
				pr_debug("Allowing implict CDB: 0x%02x"
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					" 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
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			pr_debug("Allowing implict CDB: 0x%02x for %s"
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				" reservation\n", cdb[0],
				core_scsi3_pr_dump_type(pr_reg_type));
#endif
			return 0;
		}
	}
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	pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
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		" 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)
{
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	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
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	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);
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	prg = su_dev->t10_pr.pr_generation++;
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	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;

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	if (!sess)
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		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);
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	if (!dev->dev_pr_res_holder) {
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		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);
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		return -EINVAL;
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	}
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	if (!dev->dev_pr_res_holder->isid_present_at_reg) {
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		spin_unlock(&dev->dev_reservation_lock);
		return 0;
	}
	ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
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	       sess->sess_bin_isid) ? 0 : -EINVAL;
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	/*
	 * 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)
{
623
	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
624 625 626
	struct t10_pr_registration *pr_reg;

	pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
627 628
	if (!pr_reg) {
		pr_err("Unable to allocate struct t10_pr_registration\n");
629 630 631
		return NULL;
	}

632
	pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
633
					GFP_ATOMIC);
634 635
	if (!pr_reg->pr_aptpl_buf) {
		pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694
		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);
695
	if (!pr_reg)
696 697 698 699
		return NULL;
	/*
	 * Return pointer to pr_reg for ALL_TG_PT=0
	 */
700
	if (!all_tg_pt)
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
		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.
			 */
720
			if (!deve_tmp->se_lun_acl)
721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
				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) {
754
				pr_err("core_scsi3_lunacl_depend"
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
						"_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);
772
			if (!pr_reg_atp) {
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
				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(
806
	struct t10_reservation *pr_tmpl,
807 808 809 810 811 812 813 814 815 816 817 818 819
	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;

820 821
	if (!i_port || !t_port || !sa_res_key) {
		pr_err("Illegal parameters for APTPL registration\n");
822
		return -EINVAL;
823 824 825
	}

	pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
826 827
	if (!pr_reg) {
		pr_err("Unable to allocate struct t10_pr_registration\n");
828
		return -ENOMEM;
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
	}
	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);
872
	pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
			" 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);

894
	pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
895
		" new reservation holder TYPE: %s ALL_TG_PT: %d\n",
896
		tpg->se_tpg_tfo->get_fabric_name(),
897 898
		core_scsi3_pr_dump_type(pr_reg->pr_res_type),
		(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
899
	pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
900
		tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915
		(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;
916
	struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
917 918 919 920 921 922 923 924 925 926 927
	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",
928 929
			tpg->se_tpg_tfo->tpg_get_wwn(tpg));
	tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
930 931 932 933 934 935 936 937 938
	/*
	 * 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) {
939
		if (!strcmp(pr_reg->pr_iport, i_port) &&
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982
		     (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)
{
983
	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
984 985 986
	struct se_node_acl *nacl = lun_acl->se_lun_nacl;
	struct se_dev_entry *deve = &nacl->device_list[lun_acl->mapped_lun];

987
	if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
		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);

1009
	pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
1010 1011 1012 1013
		" 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 : "");
1014
	pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
1015 1016
		 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
		tfo->tpg_get_tag(se_tpg));
1017
	pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1018 1019
		" Port(s)\n",  tfo->get_fabric_name(),
		(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1020
		dev->transport->name);
1021
	pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
		" 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)
{
1038
	struct se_subsystem_dev *su_dev = dev->se_sub_dev;
1039 1040
	struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
	struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1041
	struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052

	/*
	 * 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) ?
1053
			su_dev->t10_pr.pr_generation++ :
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
			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.
	 */
1065
	if (!pr_reg->pr_reg_all_tg_pt || register_move)
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
		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);
1109
	if (!pr_reg)
1110
		return -EPERM;
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121

	__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)
{
1122
	struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
	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.
		 */
1140
		if (!pr_reg->isid_present_at_reg) {
1141 1142 1143 1144 1145
			/*
			 * Determine if this SCSI device server requires that
			 * SCSI Intiatior TransportID w/ ISIDs is enforced
			 * for fabric modules (iSCSI) requiring them.
			 */
1146 1147
			if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
				if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
					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.
		 */
1160
		if (!isid)
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
			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;

1183
	if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1184
		memset(&buf[0], 0, PR_REG_ISID_LEN);
1185
		tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
					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;
1209
	if (!pr_res_holder) {
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
		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)) {
1239
		pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1240 1241 1242
			" UNREGISTER while existing reservation with matching"
			" key 0x%016Lx is present from another SCSI Initiator"
			" Port\n", pr_reg->pr_res_key);
1243
		ret = -EPERM;
1244 1245 1246 1247 1248 1249 1250
	}
	spin_unlock(&dev->dev_reservation_lock);

	return ret;
}

/*
1251
 * Called with struct t10_reservation->registration_lock held.
1252 1253 1254 1255 1256 1257 1258 1259 1260
 */
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;
1261
	struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
	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);
1286
		pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1287 1288 1289 1290 1291
				tfo->get_fabric_name());
		cpu_relax();
		spin_lock(&pr_tmpl->registration_lock);
	}

1292
	pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1293 1294 1295
		" Node: %s%s\n", tfo->get_fabric_name(),
		pr_reg->pr_reg_nacl->initiatorname,
		(prf_isid) ? &i_buf[0] : "");
1296
	pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1297 1298
		" Port(s)\n", tfo->get_fabric_name(),
		(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1299
		dev->transport->name);
1300
	pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1301 1302 1303
		" 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
		pr_reg->pr_res_generation);

1304
	if (!preempt_and_abort_list) {
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321
		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)
{
1322
	struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
	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)
{
1352
	struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
	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)
{
1384
	return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1385 1386 1387 1388 1389
			&tpg->tpg_group.cg_item);
}

static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
{
1390
	configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403
			&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;

1404
	return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
			&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;
	}

1418
	configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432
			&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
	 */
1433
	if (!lun_acl)
1434 1435 1436 1437 1438
		return 0;

	nacl = lun_acl->se_lun_nacl;
	tpg = nacl->se_tpg;

1439
	return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
			&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
	 */
1451
	if (!lun_acl) {
1452 1453 1454 1455 1456 1457 1458
		atomic_dec(&se_deve->pr_ref_count);
		smp_mb__after_atomic_dec();
		return;
	}
	nacl = lun_acl->se_lun_nacl;
	tpg = nacl->se_tpg;

1459
	configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
			&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)
{
1474
	struct se_device *dev = cmd->se_dev;
1475 1476
	struct se_port *tmp_port;
	struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1477
	struct se_session *se_sess = cmd->se_sess;
1478 1479 1480 1481 1482 1483 1484
	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;
1485
	unsigned char *buf;
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
	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);
1503 1504
	if (!tidh_new) {
		pr_err("Unable to allocate tidh_new\n");
1505 1506 1507 1508 1509 1510 1511
		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;

1512
	local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1513 1514
				se_sess->se_node_acl, local_se_deve, l_isid,
				sa_res_key, all_tg_pt, aptpl);
1515
	if (!local_pr_reg) {
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
		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);
1527 1528

	buf = transport_kmap_first_data_page(cmd);
1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
	/*
	 * 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) {
1540
		pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
			" 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;
1560
			if (!tmp_tpg)
1561
				continue;
1562
			tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1563
			if (!tmp_tf_ops)
1564
				continue;
1565 1566
			if (!tmp_tf_ops->get_fabric_proto_ident ||
			    !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
				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);
1580
			if (!i_str)
1581 1582 1583 1584 1585 1586 1587 1588
				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) {
1589
				pr_err(" core_scsi3_tpg_depend_item()"
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600
					" 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.
			 */
1601
			spin_lock_irq(&tmp_tpg->acl_node_lock);
1602 1603 1604 1605 1606 1607
			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();
			}
1608
			spin_unlock_irq(&tmp_tpg->acl_node_lock);