target_core_alua.c 64.4 KB
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/*******************************************************************************
 * Filename:  target_core_alua.c
 *
 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
 *
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 * (c) Copyright 2009-2013 Datera, Inc.
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 *
 * 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/configfs.h>
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#include <linux/export.h>
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#include <linux/file.h>
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#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
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#include <target/target_core_configfs.h>

C
Christoph Hellwig 已提交
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#include "target_core_internal.h"
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#include "target_core_alua.h"
#include "target_core_ua.h"

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static sense_reason_t core_alua_check_transition(int state, int valid,
						 int *primary);
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static int core_alua_set_tg_pt_secondary_state(
		struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
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		struct se_port *port, int explicit, int offline);
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static char *core_alua_dump_state(int state);

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static u16 alua_lu_gps_counter;
static u32 alua_lu_gps_count;

static DEFINE_SPINLOCK(lu_gps_lock);
static LIST_HEAD(lu_gps_list);

struct t10_alua_lu_gp *default_lu_gp;

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/*
 * REPORT REFERRALS
 *
 * See sbc3r35 section 5.23
 */
sense_reason_t
target_emulate_report_referrals(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;
	struct t10_alua_lba_map *map;
	struct t10_alua_lba_map_member *map_mem;
	unsigned char *buf;
	u32 rd_len = 0, off;

	if (cmd->data_length < 4) {
		pr_warn("REPORT REFERRALS allocation length %u too"
			" small\n", cmd->data_length);
		return TCM_INVALID_CDB_FIELD;
	}

	buf = transport_kmap_data_sg(cmd);
	if (!buf)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

	off = 4;
	spin_lock(&dev->t10_alua.lba_map_lock);
	if (list_empty(&dev->t10_alua.lba_map_list)) {
		spin_unlock(&dev->t10_alua.lba_map_lock);
		transport_kunmap_data_sg(cmd);

		return TCM_UNSUPPORTED_SCSI_OPCODE;
	}

	list_for_each_entry(map, &dev->t10_alua.lba_map_list,
			    lba_map_list) {
		int desc_num = off + 3;
		int pg_num;

		off += 4;
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		if (cmd->data_length > off)
			put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
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		off += 8;
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		if (cmd->data_length > off)
			put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
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		off += 8;
		rd_len += 20;
		pg_num = 0;
		list_for_each_entry(map_mem, &map->lba_map_mem_list,
				    lba_map_mem_list) {
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			int alua_state = map_mem->lba_map_mem_alua_state;
			int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;

			if (cmd->data_length > off)
				buf[off] = alua_state & 0x0f;
			off += 2;
			if (cmd->data_length > off)
				buf[off] = (alua_pg_id >> 8) & 0xff;
			off++;
			if (cmd->data_length > off)
				buf[off] = (alua_pg_id & 0xff);
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			off++;
			rd_len += 4;
			pg_num++;
		}
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		if (cmd->data_length > desc_num)
			buf[desc_num] = pg_num;
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	}
	spin_unlock(&dev->t10_alua.lba_map_lock);

	/*
	 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
	 */
	put_unaligned_be16(rd_len, &buf[2]);

	transport_kunmap_data_sg(cmd);

	target_complete_cmd(cmd, GOOD);
	return 0;
}

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/*
 * REPORT_TARGET_PORT_GROUPS
 *
 * See spc4r17 section 6.27
 */
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sense_reason_t
target_emulate_report_target_port_groups(struct se_cmd *cmd)
147
{
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	struct se_device *dev = cmd->se_dev;
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	struct se_port *port;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
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	unsigned char *buf;
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	u32 rd_len = 0, off;
	int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
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156
	/*
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	 * Skip over RESERVED area to first Target port group descriptor
	 * depending on the PARAMETER DATA FORMAT type..
159
	 */
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	if (ext_hdr != 0)
		off = 8;
	else
		off = 4;

	if (cmd->data_length < off) {
		pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
			" small for %s header\n", cmd->data_length,
			(ext_hdr) ? "extended" : "normal");
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		return TCM_INVALID_CDB_FIELD;
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	}
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	buf = transport_kmap_data_sg(cmd);
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	if (!buf)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
	list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
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			tg_pt_gp_list) {
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		/*
		 * Check if the Target port group and Target port descriptor list
		 * based on tg_pt_gp_members count will fit into the response payload.
		 * Otherwise, bump rd_len to let the initiator know we have exceeded
		 * the allocation length and the response is truncated.
		 */
		if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
		     cmd->data_length) {
			rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
			continue;
		}
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		/*
		 * PREF: Preferred target port bit, determine if this
		 * bit should be set for port group.
		 */
		if (tg_pt_gp->tg_pt_gp_pref)
			buf[off] = 0x80;
		/*
		 * Set the ASYMMETRIC ACCESS State
		 */
		buf[off++] |= (atomic_read(
			&tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
		/*
		 * Set supported ASYMMETRIC ACCESS State bits
		 */
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		buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
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		/*
		 * TARGET PORT GROUP
		 */
		buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
		buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);

		off++; /* Skip over Reserved */
		/*
		 * STATUS CODE
		 */
		buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
		/*
		 * Vendor Specific field
		 */
		buf[off++] = 0x00;
		/*
		 * TARGET PORT COUNT
		 */
		buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
		rd_len += 8;

		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
		list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
				tg_pt_gp_mem_list) {
			port = tg_pt_gp_mem->tg_pt;
			/*
			 * Start Target Port descriptor format
			 *
			 * See spc4r17 section 6.2.7 Table 247
			 */
			off += 2; /* Skip over Obsolete */
			/*
			 * Set RELATIVE TARGET PORT IDENTIFIER
			 */
			buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
			buf[off++] = (port->sep_rtpi & 0xff);
			rd_len += 4;
		}
		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
	}
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	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
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	/*
	 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
	 */
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	put_unaligned_be32(rd_len, &buf[0]);
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	/*
	 * Fill in the Extended header parameter data format if requested
	 */
	if (ext_hdr != 0) {
		buf[4] = 0x10;
		/*
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		 * Set the implicit transition time (in seconds) for the application
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		 * client to use as a base for it's transition timeout value.
		 *
		 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
		 * this CDB was received upon to determine this value individually
		 * for ALUA target port group.
		 */
		port = cmd->se_lun->lun_sep;
		tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
		if (tg_pt_gp_mem) {
			spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
			tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
			if (tg_pt_gp)
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				buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
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			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
		}
	}
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	transport_kunmap_data_sg(cmd);
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	target_complete_cmd(cmd, GOOD);
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	return 0;
}

/*
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 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
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 *
 * See spc4r17 section 6.35
 */
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sense_reason_t
target_emulate_set_target_port_groups(struct se_cmd *cmd)
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{
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	struct se_device *dev = cmd->se_dev;
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	struct se_port *port, *l_port = cmd->se_lun->lun_sep;
	struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
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	struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
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	unsigned char *buf;
	unsigned char *ptr;
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	sense_reason_t rc = TCM_NO_SENSE;
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	u32 len = 4; /* Skip over RESERVED area in header */
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	int alua_access_state, primary = 0, valid_states;
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	u16 tg_pt_id, rtpi;

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	if (!l_port)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;

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	if (cmd->data_length < 4) {
		pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
			" small\n", cmd->data_length);
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		return TCM_INVALID_PARAMETER_LIST;
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	}

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	buf = transport_kmap_data_sg(cmd);
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	if (!buf)
		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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312
	/*
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	 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
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	 * for the local tg_pt_gp.
	 */
	l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
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	if (!l_tg_pt_gp_mem) {
		pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
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		rc = TCM_UNSUPPORTED_SCSI_OPCODE;
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		goto out;
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	}
	spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
	l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
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	if (!l_tg_pt_gp) {
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		spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
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		pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
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		rc = TCM_UNSUPPORTED_SCSI_OPCODE;
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		goto out;
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	}
	spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);

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	if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
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		pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
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				" while TPGS_EXPLICIT_ALUA is disabled\n");
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		rc = TCM_UNSUPPORTED_SCSI_OPCODE;
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		goto out;
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	}
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	valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
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	ptr = &buf[4]; /* Skip over RESERVED area in header */

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	while (len < cmd->data_length) {
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		bool found = false;
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		alua_access_state = (ptr[0] & 0x0f);
		/*
		 * Check the received ALUA access state, and determine if
		 * the state is a primary or secondary target port asymmetric
		 * access state.
		 */
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		rc = core_alua_check_transition(alua_access_state,
						valid_states, &primary);
352
		if (rc) {
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			/*
			 * If the SET TARGET PORT GROUPS attempts to establish
			 * an invalid combination of target port asymmetric
			 * access states or attempts to establish an
			 * unsupported target port asymmetric access state,
			 * then the command shall be terminated with CHECK
			 * CONDITION status, with the sense key set to ILLEGAL
			 * REQUEST, and the additional sense code set to INVALID
			 * FIELD IN PARAMETER LIST.
			 */
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			goto out;
364
		}
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		/*
		 * If the ASYMMETRIC ACCESS STATE field (see table 267)
		 * specifies a primary target port asymmetric access state,
		 * then the TARGET PORT GROUP OR TARGET PORT field specifies
		 * a primary target port group for which the primary target
		 * port asymmetric access state shall be changed. If the
		 * ASYMMETRIC ACCESS STATE field specifies a secondary target
		 * port asymmetric access state, then the TARGET PORT GROUP OR
		 * TARGET PORT field specifies the relative target port
		 * identifier (see 3.1.120) of the target port for which the
		 * secondary target port asymmetric access state shall be
		 * changed.
		 */
		if (primary) {
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			tg_pt_id = get_unaligned_be16(ptr + 2);
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			/*
			 * Locate the matching target port group ID from
			 * the global tg_pt_gp list
			 */
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			spin_lock(&dev->t10_alua.tg_pt_gps_lock);
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			list_for_each_entry(tg_pt_gp,
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					&dev->t10_alua.tg_pt_gps_list,
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					tg_pt_gp_list) {
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				if (!tg_pt_gp->tg_pt_gp_valid_id)
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					continue;

				if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
					continue;

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				atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
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397
				spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
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399
				if (!core_alua_do_port_transition(tg_pt_gp,
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						dev, l_port, nacl,
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						alua_access_state, 1))
					found = true;
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404
				spin_lock(&dev->t10_alua.tg_pt_gps_lock);
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				atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
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				break;
			}
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			spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
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		} else {
			/*
H
Hannes Reinecke 已提交
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			 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
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			 * the Target Port in question for the the incoming
			 * SET_TARGET_PORT_GROUPS op.
			 */
415
			rtpi = get_unaligned_be16(ptr + 2);
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			/*
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			 * Locate the matching relative target port identifier
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			 * for the struct se_device storage object.
			 */
			spin_lock(&dev->se_port_lock);
			list_for_each_entry(port, &dev->dev_sep_list,
							sep_list) {
				if (port->sep_rtpi != rtpi)
					continue;

				tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
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				spin_unlock(&dev->se_port_lock);

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				if (!core_alua_set_tg_pt_secondary_state(
						tg_pt_gp_mem, port, 1, 1))
					found = true;
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				spin_lock(&dev->se_port_lock);
				break;
			}
			spin_unlock(&dev->se_port_lock);
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		}

		if (!found) {
			rc = TCM_INVALID_PARAMETER_LIST;
			goto out;
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		}

		ptr += 4;
		len += 4;
	}

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out:
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	transport_kunmap_data_sg(cmd);
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	if (!rc)
		target_complete_cmd(cmd, GOOD);
	return rc;
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}

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static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
{
	/*
	 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
	 * The ALUA additional sense code qualifier (ASCQ) is determined
	 * by the ALUA primary or secondary access state..
	 */
	pr_debug("[%s]: ALUA TG Port not available, "
		"SenseKey: NOT_READY, ASC/ASCQ: "
		"0x04/0x%02x\n",
		cmd->se_tfo->get_fabric_name(), alua_ascq);

	cmd->scsi_asc = 0x04;
	cmd->scsi_ascq = alua_ascq;
}

static inline void core_alua_state_nonoptimized(
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	struct se_cmd *cmd,
	unsigned char *cdb,
475
	int nonop_delay_msecs)
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{
	/*
	 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
	 * later to determine if processing of this cmd needs to be
	 * temporarily delayed for the Active/NonOptimized primary access state.
	 */
	cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
	cmd->alua_nonop_delay = nonop_delay_msecs;
}

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static inline int core_alua_state_lba_dependent(
	struct se_cmd *cmd,
488
	struct t10_alua_tg_pt_gp *tg_pt_gp)
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{
	struct se_device *dev = cmd->se_dev;
	u64 segment_size, segment_mult, sectors, lba;

	/* Only need to check for cdb actually containing LBAs */
	if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
		return 0;

	spin_lock(&dev->t10_alua.lba_map_lock);
	segment_size = dev->t10_alua.lba_map_segment_size;
	segment_mult = dev->t10_alua.lba_map_segment_multiplier;
	sectors = cmd->data_length / dev->dev_attrib.block_size;

	lba = cmd->t_task_lba;
	while (lba < cmd->t_task_lba + sectors) {
		struct t10_alua_lba_map *cur_map = NULL, *map;
		struct t10_alua_lba_map_member *map_mem;

		list_for_each_entry(map, &dev->t10_alua.lba_map_list,
				    lba_map_list) {
			u64 start_lba, last_lba;
			u64 first_lba = map->lba_map_first_lba;

			if (segment_mult) {
				u64 tmp = lba;
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				start_lba = do_div(tmp, segment_size * segment_mult);
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				last_lba = first_lba + segment_size - 1;
				if (start_lba >= first_lba &&
				    start_lba <= last_lba) {
					lba += segment_size;
					cur_map = map;
					break;
				}
			} else {
				last_lba = map->lba_map_last_lba;
				if (lba >= first_lba && lba <= last_lba) {
					lba = last_lba + 1;
					cur_map = map;
					break;
				}
			}
		}
		if (!cur_map) {
			spin_unlock(&dev->t10_alua.lba_map_lock);
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			set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
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			return 1;
		}
		list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
				    lba_map_mem_list) {
			if (map_mem->lba_map_mem_alua_pg_id !=
			    tg_pt_gp->tg_pt_gp_id)
				continue;
			switch(map_mem->lba_map_mem_alua_state) {
			case ALUA_ACCESS_STATE_STANDBY:
				spin_unlock(&dev->t10_alua.lba_map_lock);
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				set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
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				return 1;
			case ALUA_ACCESS_STATE_UNAVAILABLE:
				spin_unlock(&dev->t10_alua.lba_map_lock);
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				set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
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				return 1;
			default:
				break;
			}
		}
	}
	spin_unlock(&dev->t10_alua.lba_map_lock);
	return 0;
}

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static inline int core_alua_state_standby(
	struct se_cmd *cmd,
562
	unsigned char *cdb)
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{
	/*
	 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
	 * spc4r17 section 5.9.2.4.4
	 */
	switch (cdb[0]) {
	case INQUIRY:
	case LOG_SELECT:
	case LOG_SENSE:
	case MODE_SELECT:
	case MODE_SENSE:
	case REPORT_LUNS:
	case RECEIVE_DIAGNOSTIC:
	case SEND_DIAGNOSTIC:
577
	case READ_CAPACITY:
578
		return 0;
579
	case SERVICE_ACTION_IN_16:
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		switch (cdb[1] & 0x1f) {
		case SAI_READ_CAPACITY_16:
			return 0;
		default:
			set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
			return 1;
		}
587
	case MAINTENANCE_IN:
588
		switch (cdb[1] & 0x1f) {
589 590 591
		case MI_REPORT_TARGET_PGS:
			return 0;
		default:
592
			set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
593 594 595 596 597 598 599
			return 1;
		}
	case MAINTENANCE_OUT:
		switch (cdb[1]) {
		case MO_SET_TARGET_PGS:
			return 0;
		default:
600
			set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
601 602 603 604 605 606 607 608 609
			return 1;
		}
	case REQUEST_SENSE:
	case PERSISTENT_RESERVE_IN:
	case PERSISTENT_RESERVE_OUT:
	case READ_BUFFER:
	case WRITE_BUFFER:
		return 0;
	default:
610
		set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
611 612 613 614 615 616 617 618
		return 1;
	}

	return 0;
}

static inline int core_alua_state_unavailable(
	struct se_cmd *cmd,
619
	unsigned char *cdb)
620 621 622 623 624 625 626 627
{
	/*
	 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
	 * spc4r17 section 5.9.2.4.5
	 */
	switch (cdb[0]) {
	case INQUIRY:
	case REPORT_LUNS:
628
		return 0;
629
	case MAINTENANCE_IN:
630
		switch (cdb[1] & 0x1f) {
631 632 633
		case MI_REPORT_TARGET_PGS:
			return 0;
		default:
634
			set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
635 636 637 638 639 640 641
			return 1;
		}
	case MAINTENANCE_OUT:
		switch (cdb[1]) {
		case MO_SET_TARGET_PGS:
			return 0;
		default:
642
			set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
643 644 645 646 647 648 649
			return 1;
		}
	case REQUEST_SENSE:
	case READ_BUFFER:
	case WRITE_BUFFER:
		return 0;
	default:
650
		set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
651 652 653 654 655 656 657 658
		return 1;
	}

	return 0;
}

static inline int core_alua_state_transition(
	struct se_cmd *cmd,
659
	unsigned char *cdb)
660 661
{
	/*
H
Hannes Reinecke 已提交
662
	 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
663 664 665 666 667
	 * spc4r17 section 5.9.2.5
	 */
	switch (cdb[0]) {
	case INQUIRY:
	case REPORT_LUNS:
668
		return 0;
669
	case MAINTENANCE_IN:
670
		switch (cdb[1] & 0x1f) {
671 672 673
		case MI_REPORT_TARGET_PGS:
			return 0;
		default:
674
			set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
675 676 677 678 679 680 681
			return 1;
		}
	case REQUEST_SENSE:
	case READ_BUFFER:
	case WRITE_BUFFER:
		return 0;
	default:
682
		set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
683 684 685 686 687 688 689
		return 1;
	}

	return 0;
}

/*
H
Hannes Reinecke 已提交
690
 * return 1: Is used to signal LUN not accessible, and check condition/not ready
691
 * return 0: Used to signal success
H
Hannes Reinecke 已提交
692
 * return -1: Used to signal failure, and invalid cdb field
693
 */
694 695
sense_reason_t
target_alua_state_check(struct se_cmd *cmd)
696
{
C
Christoph Hellwig 已提交
697 698
	struct se_device *dev = cmd->se_dev;
	unsigned char *cdb = cmd->t_task_cdb;
699
	struct se_lun *lun = cmd->se_lun;
700 701 702 703
	struct se_port *port = lun->lun_sep;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
	int out_alua_state, nonop_delay_msecs;
C
Christoph Hellwig 已提交
704 705 706 707 708

	if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
		return 0;
	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
		return 0;
709

710
	if (!port)
711 712 713 714 715 716
		return 0;
	/*
	 * First, check for a struct se_port specific secondary ALUA target port
	 * access state: OFFLINE
	 */
	if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
717
		pr_debug("ALUA: Got secondary offline status for local"
718
				" target port\n");
719 720
		set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
		return TCM_CHECK_CONDITION_NOT_READY;
721 722 723 724 725 726 727 728
	}
	 /*
	 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
	 * ALUA target port group, to obtain current ALUA access state.
	 * Otherwise look for the underlying struct se_device association with
	 * a ALUA logical unit group.
	 */
	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
729 730 731
	if (!tg_pt_gp_mem)
		return 0;

732 733 734 735 736 737
	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
	out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
	nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	/*
738
	 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
L
Lucas De Marchi 已提交
739
	 * statement so the compiler knows explicitly to check this case first.
740 741 742
	 * For the Optimized ALUA access state case, we want to process the
	 * incoming fabric cmd ASAP..
	 */
743
	if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
744 745 746 747
		return 0;

	switch (out_alua_state) {
	case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
748
		core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
C
Christoph Hellwig 已提交
749
		break;
750
	case ALUA_ACCESS_STATE_STANDBY:
751 752
		if (core_alua_state_standby(cmd, cdb))
			return TCM_CHECK_CONDITION_NOT_READY;
C
Christoph Hellwig 已提交
753
		break;
754
	case ALUA_ACCESS_STATE_UNAVAILABLE:
755 756
		if (core_alua_state_unavailable(cmd, cdb))
			return TCM_CHECK_CONDITION_NOT_READY;
C
Christoph Hellwig 已提交
757
		break;
758
	case ALUA_ACCESS_STATE_TRANSITION:
759 760
		if (core_alua_state_transition(cmd, cdb))
			return TCM_CHECK_CONDITION_NOT_READY;
C
Christoph Hellwig 已提交
761
		break;
762
	case ALUA_ACCESS_STATE_LBA_DEPENDENT:
763 764
		if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
			return TCM_CHECK_CONDITION_NOT_READY;
765
		break;
766 767 768 769 770 771
	/*
	 * OFFLINE is a secondary ALUA target port group access state, that is
	 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
	 */
	case ALUA_ACCESS_STATE_OFFLINE:
	default:
772
		pr_err("Unknown ALUA access state: 0x%02x\n",
773
				out_alua_state);
774
		return TCM_INVALID_CDB_FIELD;
775 776
	}

777
	return 0;
778 779 780
}

/*
781
 * Check implicit and explicit ALUA state change request.
782
 */
783
static sense_reason_t
784
core_alua_check_transition(int state, int valid, int *primary)
785
{
786 787 788 789
	/*
	 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
	 * defined as primary target port asymmetric access states.
	 */
790
	switch (state) {
791
	case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
792 793 794 795
		if (!(valid & ALUA_AO_SUP))
			goto not_supported;
		*primary = 1;
		break;
796
	case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
797 798 799 800
		if (!(valid & ALUA_AN_SUP))
			goto not_supported;
		*primary = 1;
		break;
801
	case ALUA_ACCESS_STATE_STANDBY:
802 803 804 805
		if (!(valid & ALUA_S_SUP))
			goto not_supported;
		*primary = 1;
		break;
806
	case ALUA_ACCESS_STATE_UNAVAILABLE:
807 808
		if (!(valid & ALUA_U_SUP))
			goto not_supported;
809 810
		*primary = 1;
		break;
811 812 813 814 815
	case ALUA_ACCESS_STATE_LBA_DEPENDENT:
		if (!(valid & ALUA_LBD_SUP))
			goto not_supported;
		*primary = 1;
		break;
816 817 818 819 820
	case ALUA_ACCESS_STATE_OFFLINE:
		/*
		 * OFFLINE state is defined as a secondary target port
		 * asymmetric access state.
		 */
821 822
		if (!(valid & ALUA_O_SUP))
			goto not_supported;
823 824
		*primary = 0;
		break;
825 826 827 828 829 830
	case ALUA_ACCESS_STATE_TRANSITION:
		/*
		 * Transitioning is set internally, and
		 * cannot be selected manually.
		 */
		goto not_supported;
831
	default:
832
		pr_err("Unknown ALUA access state: 0x%02x\n", state);
833
		return TCM_INVALID_PARAMETER_LIST;
834 835 836
	}

	return 0;
837 838 839 840 841

not_supported:
	pr_err("ALUA access state %s not supported",
	       core_alua_dump_state(state));
	return TCM_INVALID_PARAMETER_LIST;
842 843 844 845 846
}

static char *core_alua_dump_state(int state)
{
	switch (state) {
847
	case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
848 849 850
		return "Active/Optimized";
	case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
		return "Active/NonOptimized";
851 852
	case ALUA_ACCESS_STATE_LBA_DEPENDENT:
		return "LBA Dependent";
853 854 855 856 857 858
	case ALUA_ACCESS_STATE_STANDBY:
		return "Standby";
	case ALUA_ACCESS_STATE_UNAVAILABLE:
		return "Unavailable";
	case ALUA_ACCESS_STATE_OFFLINE:
		return "Offline";
859 860
	case ALUA_ACCESS_STATE_TRANSITION:
		return "Transitioning";
861 862 863 864 865 866 867 868 869 870 871 872
	default:
		return "Unknown";
	}

	return NULL;
}

char *core_alua_dump_status(int status)
{
	switch (status) {
	case ALUA_STATUS_NONE:
		return "None";
873 874 875 876
	case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
		return "Altered by Explicit STPG";
	case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
		return "Altered by Implicit ALUA";
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
	default:
		return "Unknown";
	}

	return NULL;
}

/*
 * Used by fabric modules to determine when we need to delay processing
 * for the Active/NonOptimized paths..
 */
int core_alua_check_nonop_delay(
	struct se_cmd *cmd)
{
	if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
		return 0;
	if (in_interrupt())
		return 0;
	/*
	 * The ALUA Active/NonOptimized access state delay can be disabled
	 * in via configfs with a value of zero
	 */
899
	if (!cmd->alua_nonop_delay)
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
		return 0;
	/*
	 * struct se_cmd->alua_nonop_delay gets set by a target port group
	 * defined interval in core_alua_state_nonoptimized()
	 */
	msleep_interruptible(cmd->alua_nonop_delay);
	return 0;
}
EXPORT_SYMBOL(core_alua_check_nonop_delay);

/*
 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
 *
 */
static int core_alua_write_tpg_metadata(
	const char *path,
	unsigned char *md_buf,
	u32 md_buf_len)
{
919 920
	struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
	int ret;
921

922 923
	if (IS_ERR(file)) {
		pr_err("filp_open(%s) for ALUA metadata failed\n", path);
924 925
		return -ENODEV;
	}
926 927
	ret = kernel_write(file, md_buf, md_buf_len, 0);
	if (ret < 0)
928
		pr_err("Error writing ALUA metadata file: %s\n", path);
929
	fput(file);
930
	return (ret < 0) ? -EIO : 0;
931 932 933 934 935 936
}

/*
 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
 */
static int core_alua_update_tpg_primary_metadata(
937
	struct t10_alua_tg_pt_gp *tg_pt_gp)
938
{
939
	unsigned char *md_buf;
940
	struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
941
	char path[ALUA_METADATA_PATH_LEN];
942 943 944 945 946 947 948
	int len, rc;

	md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
	if (!md_buf) {
		pr_err("Unable to allocate buf for ALUA metadata\n");
		return -ENOMEM;
	}
949 950 951

	memset(path, 0, ALUA_METADATA_PATH_LEN);

952
	len = snprintf(md_buf, ALUA_MD_BUF_LEN,
953 954 955
			"tg_pt_gp_id=%hu\n"
			"alua_access_state=0x%02x\n"
			"alua_access_status=0x%02x\n",
956 957
			tg_pt_gp->tg_pt_gp_id,
			tg_pt_gp->tg_pt_gp_alua_pending_state,
958 959 960 961 962 963
			tg_pt_gp->tg_pt_gp_alua_access_status);

	snprintf(path, ALUA_METADATA_PATH_LEN,
		"/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
		config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));

964 965 966
	rc = core_alua_write_tpg_metadata(path, md_buf, len);
	kfree(md_buf);
	return rc;
967 968
}

969
static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
970
{
971 972 973
	struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
		struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
974 975 976 977
	struct se_dev_entry *se_deve;
	struct se_lun_acl *lacl;
	struct se_port *port;
	struct t10_alua_tg_pt_gp_member *mem;
978 979
	bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
			 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
980 981 982 983 984 985 986 987 988 989

	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
	list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
				tg_pt_gp_mem_list) {
		port = mem->tg_pt;
		/*
		 * After an implicit target port asymmetric access state
		 * change, a device server shall establish a unit attention
		 * condition for the initiator port associated with every I_T
		 * nexus with the additional sense code set to ASYMMETRIC
H
Hannes Reinecke 已提交
990
		 * ACCESS STATE CHANGED.
991 992 993 994 995 996 997 998
		 *
		 * After an explicit target port asymmetric access state
		 * change, a device server shall establish a unit attention
		 * condition with the additional sense code set to ASYMMETRIC
		 * ACCESS STATE CHANGED for the initiator port associated with
		 * every I_T nexus other than the I_T nexus on which the SET
		 * TARGET PORT GROUPS command
		 */
999
		atomic_inc_mb(&mem->tg_pt_gp_mem_ref_cnt);
1000 1001 1002 1003 1004 1005 1006 1007
		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);

		spin_lock_bh(&port->sep_alua_lock);
		list_for_each_entry(se_deve, &port->sep_alua_list,
					alua_port_list) {
			lacl = se_deve->se_lun_acl;
			/*
			 * se_deve->se_lun_acl pointer may be NULL for a
1008
			 * entry created without explicit Node+MappedLUN ACLs
1009
			 */
1010
			if (!lacl)
1011 1012
				continue;

1013 1014 1015 1016 1017 1018
			if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
			     ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
			   (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
			    (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
			   (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
			    (tg_pt_gp->tg_pt_gp_alua_port == port))
1019 1020 1021 1022 1023 1024 1025 1026 1027
				continue;

			core_scsi3_ua_allocate(lacl->se_lun_nacl,
				se_deve->mapped_lun, 0x2A,
				ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
		}
		spin_unlock_bh(&port->sep_alua_lock);

		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1028
		atomic_dec_mb(&mem->tg_pt_gp_mem_ref_cnt);
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	}
	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
	/*
	 * Update the ALUA metadata buf that has been allocated in
	 * core_alua_do_port_transition(), this metadata will be written
	 * to struct file.
	 *
	 * Note that there is the case where we do not want to update the
	 * metadata when the saved metadata is being parsed in userspace
	 * when setting the existing port access state and access status.
	 *
	 * Also note that the failure to write out the ALUA metadata to
	 * struct file does NOT affect the actual ALUA transition.
	 */
	if (tg_pt_gp->tg_pt_gp_write_metadata) {
		mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1045
		core_alua_update_tpg_primary_metadata(tg_pt_gp);
1046 1047 1048 1049 1050
		mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
	}
	/*
	 * Set the current primary ALUA access state to the requested new state
	 */
1051 1052
	atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
		   tg_pt_gp->tg_pt_gp_alua_pending_state);
1053

1054
	pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1055 1056
		" from primary access state %s to %s\n", (explicit) ? "explicit" :
		"implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1057 1058 1059
		tg_pt_gp->tg_pt_gp_id,
		core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
		core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1060 1061 1062 1063 1064 1065 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 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
	atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);

	if (tg_pt_gp->tg_pt_gp_transition_complete)
		complete(tg_pt_gp->tg_pt_gp_transition_complete);
}

static int core_alua_do_transition_tg_pt(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	int new_state,
	int explicit)
{
	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
	DECLARE_COMPLETION_ONSTACK(wait);

	/* Nothing to be done here */
	if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
		return 0;

	if (new_state == ALUA_ACCESS_STATE_TRANSITION)
		return -EAGAIN;

	/*
	 * Flush any pending transitions
	 */
	if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
	    atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
	    ALUA_ACCESS_STATE_TRANSITION) {
		/* Just in case */
		tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
		tg_pt_gp->tg_pt_gp_transition_complete = &wait;
		flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
		wait_for_completion(&wait);
		tg_pt_gp->tg_pt_gp_transition_complete = NULL;
		return 0;
	}

	/*
	 * Save the old primary ALUA access state, and set the current state
	 * to ALUA_ACCESS_STATE_TRANSITION.
	 */
	tg_pt_gp->tg_pt_gp_alua_previous_state =
		atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
	tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;

	atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
			ALUA_ACCESS_STATE_TRANSITION);
	tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
				ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
				ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;

	/*
	 * Check for the optional ALUA primary state transition delay
	 */
	if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
		msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);

	/*
	 * Take a reference for workqueue item
	 */
	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
	atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);

	if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
		unsigned long transition_tmo;

		transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
		queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
				   &tg_pt_gp->tg_pt_gp_transition_work,
				   transition_tmo);
	} else {
		tg_pt_gp->tg_pt_gp_transition_complete = &wait;
		queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
				   &tg_pt_gp->tg_pt_gp_transition_work, 0);
		wait_for_completion(&wait);
		tg_pt_gp->tg_pt_gp_transition_complete = NULL;
	}
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148

	return 0;
}

int core_alua_do_port_transition(
	struct t10_alua_tg_pt_gp *l_tg_pt_gp,
	struct se_device *l_dev,
	struct se_port *l_port,
	struct se_node_acl *l_nacl,
	int new_state,
1149
	int explicit)
1150 1151 1152 1153 1154
{
	struct se_device *dev;
	struct t10_alua_lu_gp *lu_gp;
	struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
1155
	int primary, valid_states, rc = 0;
1156

1157 1158
	valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
	if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
		return -EINVAL;

	local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
	spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
	lu_gp = local_lu_gp_mem->lu_gp;
	atomic_inc(&lu_gp->lu_gp_ref_cnt);
	spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
	/*
	 * For storage objects that are members of the 'default_lu_gp',
	 * we only do transition on the passed *l_tp_pt_gp, and not
	 * on all of the matching target port groups IDs in default_lu_gp.
	 */
1171
	if (!lu_gp->lu_gp_id) {
1172 1173 1174 1175
		/*
		 * core_alua_do_transition_tg_pt() will always return
		 * success.
		 */
1176 1177 1178 1179
		l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
		l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
		rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
						   new_state, explicit);
1180
		atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1181
		return rc;
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	}
	/*
	 * For all other LU groups aside from 'default_lu_gp', walk all of
	 * the associated storage objects looking for a matching target port
	 * group ID from the local target port group.
	 */
	spin_lock(&lu_gp->lu_gp_lock);
	list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
				lu_gp_mem_list) {

		dev = lu_gp_mem->lu_gp_mem_dev;
1193
		atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1194 1195
		spin_unlock(&lu_gp->lu_gp_lock);

1196
		spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1197
		list_for_each_entry(tg_pt_gp,
1198
				&dev->t10_alua.tg_pt_gps_list,
1199 1200
				tg_pt_gp_list) {

1201
			if (!tg_pt_gp->tg_pt_gp_valid_id)
1202 1203 1204
				continue;
			/*
			 * If the target behavior port asymmetric access state
H
Hannes Reinecke 已提交
1205
			 * is changed for any target port group accessible via
1206 1207 1208 1209 1210 1211 1212 1213 1214
			 * a logical unit within a LU group, the target port
			 * behavior group asymmetric access states for the same
			 * target port group accessible via other logical units
			 * in that LU group will also change.
			 */
			if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
				continue;

			if (l_tg_pt_gp == tg_pt_gp) {
1215 1216
				tg_pt_gp->tg_pt_gp_alua_port = l_port;
				tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1217
			} else {
1218 1219
				tg_pt_gp->tg_pt_gp_alua_port = NULL;
				tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1220
			}
1221
			atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1222
			spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1223 1224 1225 1226
			/*
			 * core_alua_do_transition_tg_pt() will always return
			 * success.
			 */
1227 1228
			rc = core_alua_do_transition_tg_pt(tg_pt_gp,
					new_state, explicit);
1229

1230
			spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1231
			atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1232 1233
			if (rc)
				break;
1234
		}
1235
		spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1236 1237

		spin_lock(&lu_gp->lu_gp_lock);
1238
		atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1239 1240 1241
	}
	spin_unlock(&lu_gp->lu_gp_lock);

1242 1243 1244 1245 1246 1247 1248 1249
	if (!rc) {
		pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
			 " Group IDs: %hu %s transition to primary state: %s\n",
			 config_item_name(&lu_gp->lu_gp_group.cg_item),
			 l_tg_pt_gp->tg_pt_gp_id,
			 (explicit) ? "explicit" : "implicit",
			 core_alua_dump_state(new_state));
	}
1250

1251
	atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1252
	return rc;
1253 1254 1255 1256 1257 1258 1259
}

/*
 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
 */
static int core_alua_update_tpg_secondary_metadata(
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1260
	struct se_port *port)
1261
{
1262
	unsigned char *md_buf;
1263 1264
	struct se_portal_group *se_tpg = port->sep_tpg;
	char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1265 1266 1267 1268 1269 1270 1271
	int len, rc;

	md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
	if (!md_buf) {
		pr_err("Unable to allocate buf for ALUA metadata\n");
		return -ENOMEM;
	}
1272 1273 1274 1275 1276

	memset(path, 0, ALUA_METADATA_PATH_LEN);
	memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);

	len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1277
			se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1278

1279
	if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1280
		snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1281
				se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1282

1283
	len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1284 1285 1286 1287 1288
			"alua_tg_pt_status=0x%02x\n",
			atomic_read(&port->sep_tg_pt_secondary_offline),
			port->sep_tg_pt_secondary_stat);

	snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1289
			se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1290 1291
			port->sep_lun->unpacked_lun);

1292 1293 1294 1295
	rc = core_alua_write_tpg_metadata(path, md_buf, len);
	kfree(md_buf);

	return rc;
1296 1297 1298 1299 1300
}

static int core_alua_set_tg_pt_secondary_state(
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
	struct se_port *port,
1301
	int explicit,
1302 1303 1304 1305 1306 1307 1308
	int offline)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	int trans_delay_msecs;

	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1309
	if (!tg_pt_gp) {
1310
		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1311
		pr_err("Unable to complete secondary state"
1312
				" transition\n");
1313
		return -EINVAL;
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
	}
	trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
	/*
	 * Set the secondary ALUA target port access state to OFFLINE
	 * or release the previously secondary state for struct se_port
	 */
	if (offline)
		atomic_set(&port->sep_tg_pt_secondary_offline, 1);
	else
		atomic_set(&port->sep_tg_pt_secondary_offline, 0);

1325 1326 1327
	port->sep_tg_pt_secondary_stat = (explicit) ?
			ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
			ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1328

1329
	pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1330 1331
		" to secondary access state: %s\n", (explicit) ? "explicit" :
		"implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
		tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");

	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	/*
	 * Do the optional transition delay after we set the secondary
	 * ALUA access state.
	 */
	if (trans_delay_msecs != 0)
		msleep_interruptible(trans_delay_msecs);
	/*
	 * See if we need to update the ALUA fabric port metadata for
	 * secondary state and status
	 */
	if (port->sep_tg_pt_secondary_write_md) {
		mutex_lock(&port->sep_tg_pt_md_mutex);
1347
		core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1348 1349 1350 1351 1352 1353
		mutex_unlock(&port->sep_tg_pt_md_mutex);
	}

	return 0;
}

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 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454
struct t10_alua_lba_map *
core_alua_allocate_lba_map(struct list_head *list,
			   u64 first_lba, u64 last_lba)
{
	struct t10_alua_lba_map *lba_map;

	lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
	if (!lba_map) {
		pr_err("Unable to allocate struct t10_alua_lba_map\n");
		return ERR_PTR(-ENOMEM);
	}
	INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
	lba_map->lba_map_first_lba = first_lba;
	lba_map->lba_map_last_lba = last_lba;

	list_add_tail(&lba_map->lba_map_list, list);
	return lba_map;
}

int
core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
			       int pg_id, int state)
{
	struct t10_alua_lba_map_member *lba_map_mem;

	list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
			    lba_map_mem_list) {
		if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
			pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
			return -EINVAL;
		}
	}

	lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
	if (!lba_map_mem) {
		pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
		return -ENOMEM;
	}
	lba_map_mem->lba_map_mem_alua_state = state;
	lba_map_mem->lba_map_mem_alua_pg_id = pg_id;

	list_add_tail(&lba_map_mem->lba_map_mem_list,
		      &lba_map->lba_map_mem_list);
	return 0;
}

void
core_alua_free_lba_map(struct list_head *lba_list)
{
	struct t10_alua_lba_map *lba_map, *lba_map_tmp;
	struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;

	list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
				 lba_map_list) {
		list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
					 &lba_map->lba_map_mem_list,
					 lba_map_mem_list) {
			list_del(&lba_map_mem->lba_map_mem_list);
			kmem_cache_free(t10_alua_lba_map_mem_cache,
					lba_map_mem);
		}
		list_del(&lba_map->lba_map_list);
		kmem_cache_free(t10_alua_lba_map_cache, lba_map);
	}
}

void
core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
		      int segment_size, int segment_mult)
{
	struct list_head old_lba_map_list;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	int activate = 0, supported;

	INIT_LIST_HEAD(&old_lba_map_list);
	spin_lock(&dev->t10_alua.lba_map_lock);
	dev->t10_alua.lba_map_segment_size = segment_size;
	dev->t10_alua.lba_map_segment_multiplier = segment_mult;
	list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
	if (lba_map_list) {
		list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
		activate = 1;
	}
	spin_unlock(&dev->t10_alua.lba_map_lock);
	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
	list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
			    tg_pt_gp_list) {

		if (!tg_pt_gp->tg_pt_gp_valid_id)
			continue;
		supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
		if (activate)
			supported |= ALUA_LBD_SUP;
		else
			supported &= ~ALUA_LBD_SUP;
		tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
	}
	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
	core_alua_free_lba_map(&old_lba_map_list);
}

1455 1456 1457 1458 1459 1460
struct t10_alua_lu_gp *
core_alua_allocate_lu_gp(const char *name, int def_group)
{
	struct t10_alua_lu_gp *lu_gp;

	lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1461 1462
	if (!lu_gp) {
		pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1463
		return ERR_PTR(-ENOMEM);
1464
	}
1465
	INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1466 1467 1468 1469 1470
	INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
	spin_lock_init(&lu_gp->lu_gp_lock);
	atomic_set(&lu_gp->lu_gp_ref_cnt, 0);

	if (def_group) {
1471
		lu_gp->lu_gp_id = alua_lu_gps_counter++;
1472
		lu_gp->lu_gp_valid_id = 1;
1473
		alua_lu_gps_count++;
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
	}

	return lu_gp;
}

int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
{
	struct t10_alua_lu_gp *lu_gp_tmp;
	u16 lu_gp_id_tmp;
	/*
	 * The lu_gp->lu_gp_id may only be set once..
	 */
	if (lu_gp->lu_gp_valid_id) {
1487
		pr_warn("ALUA LU Group already has a valid ID,"
1488
			" ignoring request\n");
1489
		return -EINVAL;
1490 1491
	}

1492 1493
	spin_lock(&lu_gps_lock);
	if (alua_lu_gps_count == 0x0000ffff) {
1494
		pr_err("Maximum ALUA alua_lu_gps_count:"
1495
				" 0x0000ffff reached\n");
1496
		spin_unlock(&lu_gps_lock);
1497
		kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1498
		return -ENOSPC;
1499 1500 1501
	}
again:
	lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1502
				alua_lu_gps_counter++;
1503

1504
	list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1505
		if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1506
			if (!lu_gp_id)
1507 1508
				goto again;

1509
			pr_warn("ALUA Logical Unit Group ID: %hu"
1510 1511
				" already exists, ignoring request\n",
				lu_gp_id);
1512 1513
			spin_unlock(&lu_gps_lock);
			return -EINVAL;
1514 1515 1516 1517 1518
		}
	}

	lu_gp->lu_gp_id = lu_gp_id_tmp;
	lu_gp->lu_gp_valid_id = 1;
1519 1520 1521
	list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
	alua_lu_gps_count++;
	spin_unlock(&lu_gps_lock);
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531

	return 0;
}

static struct t10_alua_lu_gp_member *
core_alua_allocate_lu_gp_mem(struct se_device *dev)
{
	struct t10_alua_lu_gp_member *lu_gp_mem;

	lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1532 1533
	if (!lu_gp_mem) {
		pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
		return ERR_PTR(-ENOMEM);
	}
	INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
	spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
	atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);

	lu_gp_mem->lu_gp_mem_dev = dev;
	dev->dev_alua_lu_gp_mem = lu_gp_mem;

	return lu_gp_mem;
}

void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
{
	struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
	/*
	 * Once we have reached this point, config_item_put() has
	 * already been called from target_core_alua_drop_lu_gp().
	 *
	 * Here, we remove the *lu_gp from the global list so that
	 * no associations can be made while we are releasing
	 * struct t10_alua_lu_gp.
	 */
1557 1558 1559 1560
	spin_lock(&lu_gps_lock);
	list_del(&lu_gp->lu_gp_node);
	alua_lu_gps_count--;
	spin_unlock(&lu_gps_lock);
1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
	/*
	 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
	 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
	 * released with core_alua_put_lu_gp_from_name()
	 */
	while (atomic_read(&lu_gp->lu_gp_ref_cnt))
		cpu_relax();
	/*
	 * Release reference to struct t10_alua_lu_gp * from all associated
	 * struct se_device.
	 */
	spin_lock(&lu_gp->lu_gp_lock);
	list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
				&lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
		if (lu_gp_mem->lu_gp_assoc) {
			list_del(&lu_gp_mem->lu_gp_mem_list);
			lu_gp->lu_gp_members--;
			lu_gp_mem->lu_gp_assoc = 0;
		}
		spin_unlock(&lu_gp->lu_gp_lock);
		/*
		 *
L
Lucas De Marchi 已提交
1583
		 * lu_gp_mem is associated with a single
1584 1585 1586 1587
		 * struct se_device->dev_alua_lu_gp_mem, and is released when
		 * struct se_device is released via core_alua_free_lu_gp_mem().
		 *
		 * If the passed lu_gp does NOT match the default_lu_gp, assume
H
Hannes Reinecke 已提交
1588
		 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1589 1590
		 */
		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1591
		if (lu_gp != default_lu_gp)
1592
			__core_alua_attach_lu_gp_mem(lu_gp_mem,
1593
					default_lu_gp);
1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
		else
			lu_gp_mem->lu_gp = NULL;
		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);

		spin_lock(&lu_gp->lu_gp_lock);
	}
	spin_unlock(&lu_gp->lu_gp_lock);

	kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
}

void core_alua_free_lu_gp_mem(struct se_device *dev)
{
	struct t10_alua_lu_gp *lu_gp;
	struct t10_alua_lu_gp_member *lu_gp_mem;

	lu_gp_mem = dev->dev_alua_lu_gp_mem;
1611
	if (!lu_gp_mem)
1612 1613 1614 1615 1616 1617 1618
		return;

	while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
		cpu_relax();

	spin_lock(&lu_gp_mem->lu_gp_mem_lock);
	lu_gp = lu_gp_mem->lu_gp;
1619
	if (lu_gp) {
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638
		spin_lock(&lu_gp->lu_gp_lock);
		if (lu_gp_mem->lu_gp_assoc) {
			list_del(&lu_gp_mem->lu_gp_mem_list);
			lu_gp->lu_gp_members--;
			lu_gp_mem->lu_gp_assoc = 0;
		}
		spin_unlock(&lu_gp->lu_gp_lock);
		lu_gp_mem->lu_gp = NULL;
	}
	spin_unlock(&lu_gp_mem->lu_gp_mem_lock);

	kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
}

struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
{
	struct t10_alua_lu_gp *lu_gp;
	struct config_item *ci;

1639 1640
	spin_lock(&lu_gps_lock);
	list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1641
		if (!lu_gp->lu_gp_valid_id)
1642 1643
			continue;
		ci = &lu_gp->lu_gp_group.cg_item;
1644
		if (!strcmp(config_item_name(ci), name)) {
1645
			atomic_inc(&lu_gp->lu_gp_ref_cnt);
1646
			spin_unlock(&lu_gps_lock);
1647 1648 1649
			return lu_gp;
		}
	}
1650
	spin_unlock(&lu_gps_lock);
1651 1652 1653 1654 1655 1656

	return NULL;
}

void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
{
1657
	spin_lock(&lu_gps_lock);
1658
	atomic_dec(&lu_gp->lu_gp_ref_cnt);
1659
	spin_unlock(&lu_gps_lock);
1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
}

/*
 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
 */
void __core_alua_attach_lu_gp_mem(
	struct t10_alua_lu_gp_member *lu_gp_mem,
	struct t10_alua_lu_gp *lu_gp)
{
	spin_lock(&lu_gp->lu_gp_lock);
	lu_gp_mem->lu_gp = lu_gp;
	lu_gp_mem->lu_gp_assoc = 1;
	list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
	lu_gp->lu_gp_members++;
	spin_unlock(&lu_gp->lu_gp_lock);
}

/*
 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
 */
void __core_alua_drop_lu_gp_mem(
	struct t10_alua_lu_gp_member *lu_gp_mem,
	struct t10_alua_lu_gp *lu_gp)
{
	spin_lock(&lu_gp->lu_gp_lock);
	list_del(&lu_gp_mem->lu_gp_mem_list);
	lu_gp_mem->lu_gp = NULL;
	lu_gp_mem->lu_gp_assoc = 0;
	lu_gp->lu_gp_members--;
	spin_unlock(&lu_gp->lu_gp_lock);
}

1692 1693
struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
		const char *name, int def_group)
1694 1695 1696 1697
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;

	tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1698 1699
	if (!tg_pt_gp) {
		pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1700 1701 1702 1703 1704 1705 1706
		return NULL;
	}
	INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
	INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
	mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
	spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
	atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1707 1708
	INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
			  core_alua_do_transition_tg_pt_work);
1709
	tg_pt_gp->tg_pt_gp_dev = dev;
1710
	atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1711
		ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1712
	/*
1713
	 * Enable both explicit and implicit ALUA support by default
1714 1715
	 */
	tg_pt_gp->tg_pt_gp_alua_access_type =
1716
			TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1717 1718 1719 1720 1721
	/*
	 * Set the default Active/NonOptimized Delay in milliseconds
	 */
	tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
	tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1722
	tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1723

1724 1725 1726 1727 1728 1729 1730
	/*
	 * Enable all supported states
	 */
	tg_pt_gp->tg_pt_gp_alua_supported_states =
	    ALUA_T_SUP | ALUA_O_SUP |
	    ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;

1731
	if (def_group) {
1732
		spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1733
		tg_pt_gp->tg_pt_gp_id =
1734
				dev->t10_alua.alua_tg_pt_gps_counter++;
1735
		tg_pt_gp->tg_pt_gp_valid_id = 1;
1736
		dev->t10_alua.alua_tg_pt_gps_count++;
1737
		list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1738 1739
			      &dev->t10_alua.tg_pt_gps_list);
		spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1740 1741 1742 1743 1744 1745 1746 1747 1748
	}

	return tg_pt_gp;
}

int core_alua_set_tg_pt_gp_id(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	u16 tg_pt_gp_id)
{
1749
	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1750 1751
	struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
	u16 tg_pt_gp_id_tmp;
1752

1753 1754 1755 1756
	/*
	 * The tg_pt_gp->tg_pt_gp_id may only be set once..
	 */
	if (tg_pt_gp->tg_pt_gp_valid_id) {
1757
		pr_warn("ALUA TG PT Group already has a valid ID,"
1758
			" ignoring request\n");
1759
		return -EINVAL;
1760 1761
	}

1762 1763
	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
	if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1764
		pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1765
			" 0x0000ffff reached\n");
1766
		spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1767
		kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1768
		return -ENOSPC;
1769 1770 1771
	}
again:
	tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1772
			dev->t10_alua.alua_tg_pt_gps_counter++;
1773

1774
	list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1775 1776
			tg_pt_gp_list) {
		if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1777
			if (!tg_pt_gp_id)
1778 1779
				goto again;

1780
			pr_err("ALUA Target Port Group ID: %hu already"
1781
				" exists, ignoring request\n", tg_pt_gp_id);
1782
			spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1783
			return -EINVAL;
1784 1785 1786 1787 1788 1789
		}
	}

	tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
	tg_pt_gp->tg_pt_gp_valid_id = 1;
	list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1790 1791 1792
			&dev->t10_alua.tg_pt_gps_list);
	dev->t10_alua.alua_tg_pt_gps_count++;
	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803

	return 0;
}

struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
	struct se_port *port)
{
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;

	tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
				GFP_KERNEL);
1804 1805
	if (!tg_pt_gp_mem) {
		pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820
		return ERR_PTR(-ENOMEM);
	}
	INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
	spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);

	tg_pt_gp_mem->tg_pt = port;
	port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;

	return tg_pt_gp_mem;
}

void core_alua_free_tg_pt_gp(
	struct t10_alua_tg_pt_gp *tg_pt_gp)
{
1821
	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1822
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1823

1824 1825 1826 1827 1828
	/*
	 * Once we have reached this point, config_item_put() has already
	 * been called from target_core_alua_drop_tg_pt_gp().
	 *
	 * Here we remove *tg_pt_gp from the global list so that
H
Hannes Reinecke 已提交
1829
	 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1830 1831
	 * can be made while we are releasing struct t10_alua_tg_pt_gp.
	 */
1832
	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1833
	list_del(&tg_pt_gp->tg_pt_gp_list);
1834 1835 1836
	dev->t10_alua.alua_tg_pt_gps_counter--;
	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);

1837 1838
	flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);

1839 1840 1841 1842 1843 1844 1845 1846
	/*
	 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
	 * core_alua_get_tg_pt_gp_by_name() in
	 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
	 * to be released with core_alua_put_tg_pt_gp_from_name().
	 */
	while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
		cpu_relax();
1847

1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861
	/*
	 * Release reference to struct t10_alua_tg_pt_gp from all associated
	 * struct se_port.
	 */
	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
	list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
			&tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
		if (tg_pt_gp_mem->tg_pt_gp_assoc) {
			list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
			tg_pt_gp->tg_pt_gp_members--;
			tg_pt_gp_mem->tg_pt_gp_assoc = 0;
		}
		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
		/*
L
Lucas De Marchi 已提交
1862
		 * tg_pt_gp_mem is associated with a single
1863 1864 1865 1866
		 * se_port->sep_alua_tg_pt_gp_mem, and is released via
		 * core_alua_free_tg_pt_gp_mem().
		 *
		 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
H
Hannes Reinecke 已提交
1867
		 * assume we want to re-associate a given tg_pt_gp_mem with
1868 1869 1870
		 * default_tg_pt_gp.
		 */
		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1871
		if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1872
			__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1873
					dev->t10_alua.default_tg_pt_gp);
1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
		} else
			tg_pt_gp_mem->tg_pt_gp = NULL;
		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);

		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
	}
	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);

	kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
}

void core_alua_free_tg_pt_gp_mem(struct se_port *port)
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;

	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1891
	if (!tg_pt_gp_mem)
1892 1893 1894 1895 1896 1897 1898
		return;

	while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
		cpu_relax();

	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1899
	if (tg_pt_gp) {
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914
		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
		if (tg_pt_gp_mem->tg_pt_gp_assoc) {
			list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
			tg_pt_gp->tg_pt_gp_members--;
			tg_pt_gp_mem->tg_pt_gp_assoc = 0;
		}
		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
		tg_pt_gp_mem->tg_pt_gp = NULL;
	}
	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);

	kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
}

static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1915
		struct se_device *dev, const char *name)
1916 1917 1918 1919
{
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct config_item *ci;

1920 1921
	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
	list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1922
			tg_pt_gp_list) {
1923
		if (!tg_pt_gp->tg_pt_gp_valid_id)
1924 1925
			continue;
		ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1926
		if (!strcmp(config_item_name(ci), name)) {
1927
			atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1928
			spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1929 1930 1931
			return tg_pt_gp;
		}
	}
1932
	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1933 1934 1935 1936 1937 1938 1939

	return NULL;
}

static void core_alua_put_tg_pt_gp_from_name(
	struct t10_alua_tg_pt_gp *tg_pt_gp)
{
1940
	struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1941

1942
	spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1943
	atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1944
	spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985
}

/*
 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
 */
void __core_alua_attach_tg_pt_gp_mem(
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
	struct t10_alua_tg_pt_gp *tg_pt_gp)
{
	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
	tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
	tg_pt_gp_mem->tg_pt_gp_assoc = 1;
	list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
			&tg_pt_gp->tg_pt_gp_mem_list);
	tg_pt_gp->tg_pt_gp_members++;
	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
}

/*
 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
 */
static void __core_alua_drop_tg_pt_gp_mem(
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
	struct t10_alua_tg_pt_gp *tg_pt_gp)
{
	spin_lock(&tg_pt_gp->tg_pt_gp_lock);
	list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
	tg_pt_gp_mem->tg_pt_gp = NULL;
	tg_pt_gp_mem->tg_pt_gp_assoc = 0;
	tg_pt_gp->tg_pt_gp_members--;
	spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
}

ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
{
	struct config_item *tg_pt_ci;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
	ssize_t len = 0;

	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1986
	if (!tg_pt_gp_mem)
1987 1988 1989 1990
		return len;

	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1991
	if (tg_pt_gp) {
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
		tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
		len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
			" %hu\nTG Port Primary Access State: %s\nTG Port "
			"Primary Access Status: %s\nTG Port Secondary Access"
			" State: %s\nTG Port Secondary Access Status: %s\n",
			config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
			core_alua_dump_state(atomic_read(
					&tg_pt_gp->tg_pt_gp_alua_access_state)),
			core_alua_dump_status(
				tg_pt_gp->tg_pt_gp_alua_access_status),
			(atomic_read(&port->sep_tg_pt_secondary_offline)) ?
			"Offline" : "None",
			core_alua_dump_status(port->sep_tg_pt_secondary_stat));
	}
	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);

	return len;
}

ssize_t core_alua_store_tg_pt_gp_info(
	struct se_port *port,
	const char *page,
	size_t count)
{
	struct se_portal_group *tpg;
	struct se_lun *lun;
2018
	struct se_device *dev = port->sep_lun->lun_se_dev;
2019 2020 2021 2022 2023 2024 2025 2026
	struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
	unsigned char buf[TG_PT_GROUP_NAME_BUF];
	int move = 0;

	tpg = port->sep_tpg;
	lun = port->sep_lun;

C
Christoph Hellwig 已提交
2027 2028 2029
	tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
	if (!tg_pt_gp_mem)
		return 0;
2030 2031

	if (count > TG_PT_GROUP_NAME_BUF) {
2032
		pr_err("ALUA Target Port Group alias too large!\n");
2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046
		return -EINVAL;
	}
	memset(buf, 0, TG_PT_GROUP_NAME_BUF);
	memcpy(buf, page, count);
	/*
	 * Any ALUA target port group alias besides "NULL" means we will be
	 * making a new group association.
	 */
	if (strcmp(strstrip(buf), "NULL")) {
		/*
		 * core_alua_get_tg_pt_gp_by_name() will increment reference to
		 * struct t10_alua_tg_pt_gp.  This reference is released with
		 * core_alua_put_tg_pt_gp_from_name() below.
		 */
2047
		tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2048
					strstrip(buf));
2049
		if (!tg_pt_gp_new)
2050 2051 2052 2053 2054
			return -ENODEV;
	}

	spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
	tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2055
	if (tg_pt_gp) {
2056 2057 2058 2059
		/*
		 * Clearing an existing tg_pt_gp association, and replacing
		 * with the default_tg_pt_gp.
		 */
2060 2061
		if (!tg_pt_gp_new) {
			pr_debug("Target_Core_ConfigFS: Moving"
2062 2063 2064
				" %s/tpgt_%hu/%s from ALUA Target Port Group:"
				" alua/%s, ID: %hu back to"
				" default_tg_pt_gp\n",
2065 2066
				tpg->se_tpg_tfo->tpg_get_wwn(tpg),
				tpg->se_tpg_tfo->tpg_get_tag(tpg),
2067 2068 2069 2070 2071 2072 2073
				config_item_name(&lun->lun_group.cg_item),
				config_item_name(
					&tg_pt_gp->tg_pt_gp_group.cg_item),
				tg_pt_gp->tg_pt_gp_id);

			__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
			__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2074
					dev->t10_alua.default_tg_pt_gp);
2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
			spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);

			return count;
		}
		/*
		 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
		 */
		__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
		move = 1;
	}
	/*
	 * Associate tg_pt_gp_mem with tg_pt_gp_new.
	 */
	__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
	spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2090
	pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2091
		" Target Port Group: alua/%s, ID: %hu\n", (move) ?
2092 2093
		"Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
		tpg->se_tpg_tfo->tpg_get_tag(tpg),
2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
		config_item_name(&lun->lun_group.cg_item),
		config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
		tg_pt_gp_new->tg_pt_gp_id);

	core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
	return count;
}

ssize_t core_alua_show_access_type(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
2106 2107 2108 2109 2110 2111 2112
	if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
	    (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
		return sprintf(page, "Implicit and Explicit\n");
	else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
		return sprintf(page, "Implicit\n");
	else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
		return sprintf(page, "Explicit\n");
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
	else
		return sprintf(page, "None\n");
}

ssize_t core_alua_store_access_type(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

2125
	ret = kstrtoul(page, 0, &tmp);
2126
	if (ret < 0) {
2127
		pr_err("Unable to extract alua_access_type\n");
2128
		return ret;
2129 2130
	}
	if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2131
		pr_err("Illegal value for alua_access_type:"
2132 2133 2134 2135 2136
				" %lu\n", tmp);
		return -EINVAL;
	}
	if (tmp == 3)
		tg_pt_gp->tg_pt_gp_alua_access_type =
2137
			TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2138
	else if (tmp == 2)
2139
		tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2140
	else if (tmp == 1)
2141
		tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
	else
		tg_pt_gp->tg_pt_gp_alua_access_type = 0;

	return count;
}

ssize_t core_alua_show_nonop_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
}

ssize_t core_alua_store_nonop_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

2163
	ret = kstrtoul(page, 0, &tmp);
2164
	if (ret < 0) {
2165
		pr_err("Unable to extract nonop_delay_msecs\n");
2166
		return ret;
2167 2168
	}
	if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2169
		pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193
			" ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
			ALUA_MAX_NONOP_DELAY_MSECS);
		return -EINVAL;
	}
	tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;

	return count;
}

ssize_t core_alua_show_trans_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
}

ssize_t core_alua_store_trans_delay_msecs(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

2194
	ret = kstrtoul(page, 0, &tmp);
2195
	if (ret < 0) {
2196
		pr_err("Unable to extract trans_delay_msecs\n");
2197
		return ret;
2198 2199
	}
	if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2200
		pr_err("Passed trans_delay_msecs: %lu, exceeds"
2201 2202 2203 2204 2205 2206 2207 2208 2209
			" ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
			ALUA_MAX_TRANS_DELAY_MSECS);
		return -EINVAL;
	}
	tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;

	return count;
}

2210
ssize_t core_alua_show_implicit_trans_secs(
2211 2212 2213
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
2214
	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2215 2216
}

2217
ssize_t core_alua_store_implicit_trans_secs(
2218 2219 2220 2221 2222 2223 2224
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

2225
	ret = kstrtoul(page, 0, &tmp);
2226
	if (ret < 0) {
2227
		pr_err("Unable to extract implicit_trans_secs\n");
2228
		return ret;
2229
	}
2230 2231 2232 2233
	if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
		pr_err("Passed implicit_trans_secs: %lu, exceeds"
			" ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
			ALUA_MAX_IMPLICIT_TRANS_SECS);
2234 2235
		return  -EINVAL;
	}
2236
	tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2237 2238 2239 2240

	return count;
}

2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255
ssize_t core_alua_show_preferred_bit(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	char *page)
{
	return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
}

ssize_t core_alua_store_preferred_bit(
	struct t10_alua_tg_pt_gp *tg_pt_gp,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

2256
	ret = kstrtoul(page, 0, &tmp);
2257
	if (ret < 0) {
2258
		pr_err("Unable to extract preferred ALUA value\n");
2259
		return ret;
2260 2261
	}
	if ((tmp != 0) && (tmp != 1)) {
2262
		pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2263 2264 2265 2266 2267 2268 2269 2270 2271
		return -EINVAL;
	}
	tg_pt_gp->tg_pt_gp_pref = (int)tmp;

	return count;
}

ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
{
2272
	if (!lun->lun_sep)
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287
		return -ENODEV;

	return sprintf(page, "%d\n",
		atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
}

ssize_t core_alua_store_offline_bit(
	struct se_lun *lun,
	const char *page,
	size_t count)
{
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
	unsigned long tmp;
	int ret;

2288
	if (!lun->lun_sep)
2289 2290
		return -ENODEV;

2291
	ret = kstrtoul(page, 0, &tmp);
2292
	if (ret < 0) {
2293
		pr_err("Unable to extract alua_tg_pt_offline value\n");
2294
		return ret;
2295 2296
	}
	if ((tmp != 0) && (tmp != 1)) {
2297
		pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2298 2299 2300 2301
				tmp);
		return -EINVAL;
	}
	tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2302 2303
	if (!tg_pt_gp_mem) {
		pr_err("Unable to locate *tg_pt_gp_mem\n");
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329
		return -EINVAL;
	}

	ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
			lun->lun_sep, 0, (int)tmp);
	if (ret < 0)
		return -EINVAL;

	return count;
}

ssize_t core_alua_show_secondary_status(
	struct se_lun *lun,
	char *page)
{
	return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
}

ssize_t core_alua_store_secondary_status(
	struct se_lun *lun,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

2330
	ret = kstrtoul(page, 0, &tmp);
2331
	if (ret < 0) {
2332
		pr_err("Unable to extract alua_tg_pt_status\n");
2333
		return ret;
2334 2335
	}
	if ((tmp != ALUA_STATUS_NONE) &&
2336 2337
	    (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
	    (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2338
		pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362
				tmp);
		return -EINVAL;
	}
	lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;

	return count;
}

ssize_t core_alua_show_secondary_write_metadata(
	struct se_lun *lun,
	char *page)
{
	return sprintf(page, "%d\n",
			lun->lun_sep->sep_tg_pt_secondary_write_md);
}

ssize_t core_alua_store_secondary_write_metadata(
	struct se_lun *lun,
	const char *page,
	size_t count)
{
	unsigned long tmp;
	int ret;

2363
	ret = kstrtoul(page, 0, &tmp);
2364
	if (ret < 0) {
2365
		pr_err("Unable to extract alua_tg_pt_write_md\n");
2366
		return ret;
2367 2368
	}
	if ((tmp != 0) && (tmp != 1)) {
2369
		pr_err("Illegal value for alua_tg_pt_write_md:"
2370 2371 2372 2373 2374 2375 2376 2377
				" %lu\n", tmp);
		return -EINVAL;
	}
	lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;

	return count;
}

2378
int core_setup_alua(struct se_device *dev)
2379
{
C
Christoph Hellwig 已提交
2380 2381 2382
	if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
	    !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
		struct t10_alua_lu_gp_member *lu_gp_mem;
2383

2384
		/*
L
Lucas De Marchi 已提交
2385
		 * Associate this struct se_device with the default ALUA
2386 2387 2388
		 * LUN Group.
		 */
		lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2389 2390
		if (IS_ERR(lu_gp_mem))
			return PTR_ERR(lu_gp_mem);
2391 2392 2393

		spin_lock(&lu_gp_mem->lu_gp_mem_lock);
		__core_alua_attach_lu_gp_mem(lu_gp_mem,
2394
				default_lu_gp);
2395 2396
		spin_unlock(&lu_gp_mem->lu_gp_mem_lock);

2397
		pr_debug("%s: Adding to default ALUA LU Group:"
2398
			" core/alua/lu_gps/default_lu_gp\n",
2399
			dev->transport->name);
2400 2401 2402 2403
	}

	return 0;
}