target_core_device.c 44.9 KB
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/*******************************************************************************
 * Filename:  target_core_device.c (based on iscsi_target_device.c)
 *
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 * This file contains the TCM Virtual Device and Disk Transport
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 * agnostic related functions.
 *
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 * (c) Copyright 2003-2013 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/net.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/kthread.h>
#include <linux/in.h>
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#include <linux/export.h>
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#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
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#include <scsi/scsi_device.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_core_internal.h"
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#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"

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DEFINE_MUTEX(g_device_mutex);
LIST_HEAD(g_device_list);

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static struct se_hba *lun0_hba;
/* not static, needed by tpg.c */
struct se_device *g_lun0_dev;

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sense_reason_t
transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
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{
	struct se_lun *se_lun = NULL;
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	struct se_session *se_sess = se_cmd->se_sess;
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	struct se_device *dev;
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	unsigned long flags;

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	if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
		return TCM_NON_EXISTENT_LUN;
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	spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
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	se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
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	if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
		struct se_dev_entry *deve = se_cmd->se_deve;

		deve->total_cmds++;

		if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
		    (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
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			pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
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				" Access for 0x%08x\n",
				se_cmd->se_tfo->get_fabric_name(),
				unpacked_lun);
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			spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
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			return TCM_WRITE_PROTECTED;
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		}
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		if (se_cmd->data_direction == DMA_TO_DEVICE)
			deve->write_bytes += se_cmd->data_length;
		else if (se_cmd->data_direction == DMA_FROM_DEVICE)
			deve->read_bytes += se_cmd->data_length;

		se_lun = deve->se_lun;
		se_cmd->se_lun = deve->se_lun;
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		se_cmd->pr_res_key = deve->pr_res_key;
		se_cmd->orig_fe_lun = unpacked_lun;
		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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		percpu_ref_get(&se_lun->lun_ref);
		se_cmd->lun_ref_active = true;
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	}
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	spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
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	if (!se_lun) {
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		/*
		 * Use the se_portal_group->tpg_virt_lun0 to allow for
		 * REPORT_LUNS, et al to be returned when no active
		 * MappedLUN=0 exists for this Initiator Port.
		 */
		if (unpacked_lun != 0) {
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			pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
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				" Access for 0x%08x\n",
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				se_cmd->se_tfo->get_fabric_name(),
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				unpacked_lun);
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			return TCM_NON_EXISTENT_LUN;
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		}
		/*
		 * Force WRITE PROTECT for virtual LUN 0
		 */
		if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
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		    (se_cmd->data_direction != DMA_NONE))
			return TCM_WRITE_PROTECTED;
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		se_lun = &se_sess->se_tpg->tpg_virt_lun0;
		se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
		se_cmd->orig_fe_lun = 0;
		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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		percpu_ref_get(&se_lun->lun_ref);
		se_cmd->lun_ref_active = true;
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	}

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	/* Directly associate cmd with se_dev */
	se_cmd->se_dev = se_lun->lun_se_dev;

	dev = se_lun->lun_se_dev;
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	atomic_long_inc(&dev->num_cmds);
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	if (se_cmd->data_direction == DMA_TO_DEVICE)
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		atomic_long_add(se_cmd->data_length, &dev->write_bytes);
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	else if (se_cmd->data_direction == DMA_FROM_DEVICE)
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		atomic_long_add(se_cmd->data_length, &dev->read_bytes);
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	return 0;
}
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EXPORT_SYMBOL(transport_lookup_cmd_lun);
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int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
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{
	struct se_dev_entry *deve;
	struct se_lun *se_lun = NULL;
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	struct se_session *se_sess = se_cmd->se_sess;
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	struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
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	unsigned long flags;
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	if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
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		return -ENODEV;
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	spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
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	se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
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	deve = se_cmd->se_deve;

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	if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
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		se_tmr->tmr_lun = deve->se_lun;
		se_cmd->se_lun = deve->se_lun;
		se_lun = deve->se_lun;
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		se_cmd->pr_res_key = deve->pr_res_key;
		se_cmd->orig_fe_lun = unpacked_lun;
	}
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	spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
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	if (!se_lun) {
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		pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
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			" Access for 0x%08x\n",
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			se_cmd->se_tfo->get_fabric_name(),
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			unpacked_lun);
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		return -ENODEV;
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	}

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	/* Directly associate cmd with se_dev */
	se_cmd->se_dev = se_lun->lun_se_dev;
	se_tmr->tmr_dev = se_lun->lun_se_dev;

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	spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
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	list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
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	spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
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	return 0;
}
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EXPORT_SYMBOL(transport_lookup_tmr_lun);
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/*
 * This function is called from core_scsi3_emulate_pro_register_and_move()
 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 * when a matching rtpi is found.
 */
struct se_dev_entry *core_get_se_deve_from_rtpi(
	struct se_node_acl *nacl,
	u16 rtpi)
{
	struct se_dev_entry *deve;
	struct se_lun *lun;
	struct se_port *port;
	struct se_portal_group *tpg = nacl->se_tpg;
	u32 i;

	spin_lock_irq(&nacl->device_list_lock);
	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
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		deve = nacl->device_list[i];
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		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
			continue;

		lun = deve->se_lun;
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		if (!lun) {
			pr_err("%s device entries device pointer is"
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				" NULL, but Initiator has access.\n",
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				tpg->se_tpg_tfo->get_fabric_name());
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			continue;
		}
		port = lun->lun_sep;
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		if (!port) {
			pr_err("%s device entries device pointer is"
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				" NULL, but Initiator has access.\n",
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				tpg->se_tpg_tfo->get_fabric_name());
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			continue;
		}
		if (port->sep_rtpi != rtpi)
			continue;

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		atomic_inc_mb(&deve->pr_ref_count);
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		spin_unlock_irq(&nacl->device_list_lock);

		return deve;
	}
	spin_unlock_irq(&nacl->device_list_lock);

	return NULL;
}

int core_free_device_list_for_node(
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	struct se_dev_entry *deve;
	struct se_lun *lun;
	u32 i;

	if (!nacl->device_list)
		return 0;

	spin_lock_irq(&nacl->device_list_lock);
	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
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		deve = nacl->device_list[i];
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		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
			continue;

		if (!deve->se_lun) {
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			pr_err("%s device entries device pointer is"
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				" NULL, but Initiator has access.\n",
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				tpg->se_tpg_tfo->get_fabric_name());
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			continue;
		}
		lun = deve->se_lun;

		spin_unlock_irq(&nacl->device_list_lock);
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		core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
			TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
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		spin_lock_irq(&nacl->device_list_lock);
	}
	spin_unlock_irq(&nacl->device_list_lock);

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	array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
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	nacl->device_list = NULL;

	return 0;
}

void core_update_device_list_access(
	u32 mapped_lun,
	u32 lun_access,
	struct se_node_acl *nacl)
{
	struct se_dev_entry *deve;

	spin_lock_irq(&nacl->device_list_lock);
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	deve = nacl->device_list[mapped_lun];
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	if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
		deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
		deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
	} else {
		deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
		deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
	}
	spin_unlock_irq(&nacl->device_list_lock);
}

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/*      core_enable_device_list_for_node():
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 *
 *
 */
299
int core_enable_device_list_for_node(
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	struct se_lun *lun,
	struct se_lun_acl *lun_acl,
	u32 mapped_lun,
	u32 lun_access,
	struct se_node_acl *nacl,
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	struct se_portal_group *tpg)
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{
	struct se_port *port = lun->lun_sep;
308
	struct se_dev_entry *deve;
309 310

	spin_lock_irq(&nacl->device_list_lock);
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	deve = nacl->device_list[mapped_lun];

	/*
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	 * Check if the call is handling demo mode -> explicit LUN ACL
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	 * transition.  This transition must be for the same struct se_lun
	 * + mapped_lun that was setup in demo mode..
	 */
	if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
		if (deve->se_lun_acl != NULL) {
			pr_err("struct se_dev_entry->se_lun_acl"
322
			       " already set for demo mode -> explicit"
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			       " LUN ACL transition\n");
			spin_unlock_irq(&nacl->device_list_lock);
			return -EINVAL;
		}
		if (deve->se_lun != lun) {
			pr_err("struct se_dev_entry->se_lun does"
			       " match passed struct se_lun for demo mode"
330
			       " -> explicit LUN ACL transition\n");
331 332
			spin_unlock_irq(&nacl->device_list_lock);
			return -EINVAL;
333
		}
334
		deve->se_lun_acl = lun_acl;
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		if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
			deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
			deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
		} else {
			deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
			deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
		}

		spin_unlock_irq(&nacl->device_list_lock);
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		return 0;
	}
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	deve->se_lun = lun;
	deve->se_lun_acl = lun_acl;
	deve->mapped_lun = mapped_lun;
	deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
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	if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
		deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
		deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
	} else {
		deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
		deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
359
	}
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	deve->creation_time = get_jiffies_64();
	deve->attach_count++;
	spin_unlock_irq(&nacl->device_list_lock);

	spin_lock_bh(&port->sep_alua_lock);
	list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
	spin_unlock_bh(&port->sep_alua_lock);

	return 0;
}

/*      core_disable_device_list_for_node():
 *
 *
 */
int core_disable_device_list_for_node(
	struct se_lun *lun,
	struct se_lun_acl *lun_acl,
	u32 mapped_lun,
	u32 lun_access,
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	struct se_port *port = lun->lun_sep;
385
	struct se_dev_entry *deve = nacl->device_list[mapped_lun];
386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402

	/*
	 * If the MappedLUN entry is being disabled, the entry in
	 * port->sep_alua_list must be removed now before clearing the
	 * struct se_dev_entry pointers below as logic in
	 * core_alua_do_transition_tg_pt() depends on these being present.
	 *
	 * deve->se_lun_acl will be NULL for demo-mode created LUNs
	 * that have not been explicitly converted to MappedLUNs ->
	 * struct se_lun_acl, but we remove deve->alua_port_list from
	 * port->sep_alua_list. This also means that active UAs and
	 * NodeACL context specific PR metadata for demo-mode
	 * MappedLUN *deve will be released below..
	 */
	spin_lock_bh(&port->sep_alua_lock);
	list_del(&deve->alua_port_list);
	spin_unlock_bh(&port->sep_alua_lock);
403 404 405 406 407 408
	/*
	 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
	 * PR operation to complete.
	 */
	while (atomic_read(&deve->pr_ref_count) != 0)
		cpu_relax();
409

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	spin_lock_irq(&nacl->device_list_lock);
	/*
	 * Disable struct se_dev_entry LUN ACL mapping
	 */
	core_scsi3_ua_release_all(deve);
	deve->se_lun = NULL;
	deve->se_lun_acl = NULL;
	deve->lun_flags = 0;
	deve->creation_time = 0;
	deve->attach_count--;
	spin_unlock_irq(&nacl->device_list_lock);

	core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
	return 0;
}

/*      core_clear_lun_from_tpg():
 *
 *
 */
void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
{
	struct se_node_acl *nacl;
	struct se_dev_entry *deve;
	u32 i;

436
	spin_lock_irq(&tpg->acl_node_lock);
437
	list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
438
		spin_unlock_irq(&tpg->acl_node_lock);
439 440 441

		spin_lock_irq(&nacl->device_list_lock);
		for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
442
			deve = nacl->device_list[i];
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			if (lun != deve->se_lun)
				continue;
			spin_unlock_irq(&nacl->device_list_lock);

447
			core_disable_device_list_for_node(lun, NULL,
448
				deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
449
				nacl, tpg);
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			spin_lock_irq(&nacl->device_list_lock);
		}
		spin_unlock_irq(&nacl->device_list_lock);

455
		spin_lock_irq(&tpg->acl_node_lock);
456
	}
457
	spin_unlock_irq(&tpg->acl_node_lock);
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}

static struct se_port *core_alloc_port(struct se_device *dev)
{
	struct se_port *port, *port_tmp;

	port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
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	if (!port) {
		pr_err("Unable to allocate struct se_port\n");
467
		return ERR_PTR(-ENOMEM);
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	}
	INIT_LIST_HEAD(&port->sep_alua_list);
	INIT_LIST_HEAD(&port->sep_list);
	atomic_set(&port->sep_tg_pt_secondary_offline, 0);
	spin_lock_init(&port->sep_alua_lock);
	mutex_init(&port->sep_tg_pt_md_mutex);

	spin_lock(&dev->se_port_lock);
	if (dev->dev_port_count == 0x0000ffff) {
477
		pr_warn("Reached dev->dev_port_count =="
478 479
				" 0x0000ffff\n");
		spin_unlock(&dev->se_port_lock);
480
		return ERR_PTR(-ENOSPC);
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	}
again:
	/*
484
	 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
485 486 487 488 489 490 491 492 493 494 495
	 * Here is the table from spc4r17 section 7.7.3.8.
	 *
	 *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
	 *
	 * Code      Description
	 * 0h        Reserved
	 * 1h        Relative port 1, historically known as port A
	 * 2h        Relative port 2, historically known as port B
	 * 3h to FFFFh    Relative port 3 through 65 535
	 */
	port->sep_rtpi = dev->dev_rpti_counter++;
496
	if (!port->sep_rtpi)
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		goto again;

	list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
		/*
501
		 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
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		 * for 16-bit wrap..
		 */
		if (port->sep_rtpi == port_tmp->sep_rtpi)
			goto again;
	}
	spin_unlock(&dev->se_port_lock);

	return port;
}

static void core_export_port(
	struct se_device *dev,
	struct se_portal_group *tpg,
	struct se_port *port,
	struct se_lun *lun)
{
	struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;

	spin_lock(&dev->se_port_lock);
	spin_lock(&lun->lun_sep_lock);
	port->sep_tpg = tpg;
	port->sep_lun = lun;
	lun->lun_sep = port;
	spin_unlock(&lun->lun_sep_lock);

	list_add_tail(&port->sep_list, &dev->dev_sep_list);
	spin_unlock(&dev->se_port_lock);

C
Christoph Hellwig 已提交
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	if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
	    !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
532 533
		tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
		if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
534
			pr_err("Unable to allocate t10_alua_tg_pt"
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					"_gp_member_t\n");
			return;
		}
		spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
		__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
540
			dev->t10_alua.default_tg_pt_gp);
541
		spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
542
		pr_debug("%s/%s: Adding to default ALUA Target Port"
543
			" Group: alua/default_tg_pt_gp\n",
544
			dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
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	}

	dev->dev_port_count++;
548
	port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
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}

/*
 *	Called with struct se_device->se_port_lock spinlock held.
 */
static void core_release_port(struct se_device *dev, struct se_port *port)
555
	__releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
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{
	/*
	 * Wait for any port reference for PR ALL_TG_PT=1 operation
	 * to complete in __core_scsi3_alloc_registration()
	 */
	spin_unlock(&dev->se_port_lock);
	if (atomic_read(&port->sep_tg_pt_ref_cnt))
		cpu_relax();
	spin_lock(&dev->se_port_lock);

	core_alua_free_tg_pt_gp_mem(port);

	list_del(&port->sep_list);
	dev->dev_port_count--;
	kfree(port);
}

int core_dev_export(
	struct se_device *dev,
	struct se_portal_group *tpg,
	struct se_lun *lun)
{
578
	struct se_hba *hba = dev->se_hba;
579 580 581
	struct se_port *port;

	port = core_alloc_port(dev);
582 583
	if (IS_ERR(port))
		return PTR_ERR(port);
584 585 586

	lun->lun_se_dev = dev;

587 588 589 590
	spin_lock(&hba->device_lock);
	dev->export_count++;
	spin_unlock(&hba->device_lock);

591 592 593 594 595 596 597 598 599
	core_export_port(dev, tpg, port, lun);
	return 0;
}

void core_dev_unexport(
	struct se_device *dev,
	struct se_portal_group *tpg,
	struct se_lun *lun)
{
600
	struct se_hba *hba = dev->se_hba;
601 602 603 604 605 606 607 608 609 610 611 612 613
	struct se_port *port = lun->lun_sep;

	spin_lock(&lun->lun_sep_lock);
	if (lun->lun_se_dev == NULL) {
		spin_unlock(&lun->lun_sep_lock);
		return;
	}
	spin_unlock(&lun->lun_sep_lock);

	spin_lock(&dev->se_port_lock);
	core_release_port(dev, port);
	spin_unlock(&dev->se_port_lock);

614 615 616 617
	spin_lock(&hba->device_lock);
	dev->export_count--;
	spin_unlock(&hba->device_lock);

618
	lun->lun_sep = NULL;
619 620 621
	lun->lun_se_dev = NULL;
}

622
static void se_release_vpd_for_dev(struct se_device *dev)
623 624 625
{
	struct t10_vpd *vpd, *vpd_tmp;

626
	spin_lock(&dev->t10_wwn.t10_vpd_lock);
627
	list_for_each_entry_safe(vpd, vpd_tmp,
628
			&dev->t10_wwn.t10_vpd_list, vpd_list) {
629 630 631
		list_del(&vpd->vpd_list);
		kfree(vpd);
	}
632
	spin_unlock(&dev->t10_wwn.t10_vpd_lock);
633 634
}

635
static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
636
{
637 638
	u32 aligned_max_sectors;
	u32 alignment;
639 640 641 642
	/*
	 * Limit max_sectors to a PAGE_SIZE aligned value for modern
	 * transport_allocate_data_tasks() operation.
	 */
643 644 645 646 647 648
	alignment = max(1ul, PAGE_SIZE / block_size);
	aligned_max_sectors = rounddown(max_sectors, alignment);

	if (max_sectors != aligned_max_sectors)
		pr_info("Rounding down aligned max_sectors from %u to %u\n",
			max_sectors, aligned_max_sectors);
649

650
	return aligned_max_sectors;
651 652
}

653 654 655 656 657 658 659 660 661 662 663 664
bool se_dev_check_wce(struct se_device *dev)
{
	bool wce = false;

	if (dev->transport->get_write_cache)
		wce = dev->transport->get_write_cache(dev);
	else if (dev->dev_attrib.emulate_write_cache > 0)
		wce = true;

	return wce;
}

665 666 667 668
int se_dev_set_max_unmap_lba_count(
	struct se_device *dev,
	u32 max_unmap_lba_count)
{
669
	dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
670
	pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
671
			dev, dev->dev_attrib.max_unmap_lba_count);
672 673
	return 0;
}
674
EXPORT_SYMBOL(se_dev_set_max_unmap_lba_count);
675 676 677 678 679

int se_dev_set_max_unmap_block_desc_count(
	struct se_device *dev,
	u32 max_unmap_block_desc_count)
{
680
	dev->dev_attrib.max_unmap_block_desc_count =
681
		max_unmap_block_desc_count;
682
	pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
683
			dev, dev->dev_attrib.max_unmap_block_desc_count);
684 685
	return 0;
}
686
EXPORT_SYMBOL(se_dev_set_max_unmap_block_desc_count);
687 688 689 690 691

int se_dev_set_unmap_granularity(
	struct se_device *dev,
	u32 unmap_granularity)
{
692
	dev->dev_attrib.unmap_granularity = unmap_granularity;
693
	pr_debug("dev[%p]: Set unmap_granularity: %u\n",
694
			dev, dev->dev_attrib.unmap_granularity);
695 696
	return 0;
}
697
EXPORT_SYMBOL(se_dev_set_unmap_granularity);
698 699 700 701 702

int se_dev_set_unmap_granularity_alignment(
	struct se_device *dev,
	u32 unmap_granularity_alignment)
{
703
	dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
704
	pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
705
			dev, dev->dev_attrib.unmap_granularity_alignment);
706 707
	return 0;
}
708
EXPORT_SYMBOL(se_dev_set_unmap_granularity_alignment);
709

710 711 712 713 714 715 716 717 718
int se_dev_set_max_write_same_len(
	struct se_device *dev,
	u32 max_write_same_len)
{
	dev->dev_attrib.max_write_same_len = max_write_same_len;
	pr_debug("dev[%p]: Set max_write_same_len: %u\n",
			dev, dev->dev_attrib.max_write_same_len);
	return 0;
}
719
EXPORT_SYMBOL(se_dev_set_max_write_same_len);
720

721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
static void dev_set_t10_wwn_model_alias(struct se_device *dev)
{
	const char *configname;

	configname = config_item_name(&dev->dev_group.cg_item);
	if (strlen(configname) >= 16) {
		pr_warn("dev[%p]: Backstore name '%s' is too long for "
			"INQUIRY_MODEL, truncating to 16 bytes\n", dev,
			configname);
	}
	snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
}

int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
{
	if (dev->export_count) {
		pr_err("dev[%p]: Unable to change model alias"
			" while export_count is %d\n",
			dev, dev->export_count);
			return -EINVAL;
	}

	if (flag != 0 && flag != 1) {
		pr_err("Illegal value %d\n", flag);
		return -EINVAL;
	}

	if (flag) {
		dev_set_t10_wwn_model_alias(dev);
	} else {
		strncpy(&dev->t10_wwn.model[0],
			dev->transport->inquiry_prod, 16);
	}
	dev->dev_attrib.emulate_model_alias = flag;

	return 0;
}
758
EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
759

760 761
int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
{
762
	if (flag != 0 && flag != 1) {
763
		pr_err("Illegal value %d\n", flag);
764
		return -EINVAL;
765
	}
766

767 768 769 770 771 772
	if (flag) {
		pr_err("dpo_emulated not supported\n");
		return -EINVAL;
	}

	return 0;
773
}
774
EXPORT_SYMBOL(se_dev_set_emulate_dpo);
775 776 777

int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
{
778
	if (flag != 0 && flag != 1) {
779
		pr_err("Illegal value %d\n", flag);
780
		return -EINVAL;
781
	}
782 783 784 785 786 787 788 789 790 791
	if (flag &&
	    dev->transport->get_write_cache) {
		pr_err("emulate_fua_write not supported for this device\n");
		return -EINVAL;
	}
	if (dev->export_count) {
		pr_err("emulate_fua_write cannot be changed with active"
		       " exports: %d\n", dev->export_count);
		return -EINVAL;
	}
792
	dev->dev_attrib.emulate_fua_write = flag;
793
	pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
794
			dev, dev->dev_attrib.emulate_fua_write);
795 796
	return 0;
}
797
EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
798 799 800

int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
{
801
	if (flag != 0 && flag != 1) {
802
		pr_err("Illegal value %d\n", flag);
803
		return -EINVAL;
804
	}
805

806 807 808 809 810 811
	if (flag) {
		pr_err("ua read emulated not supported\n");
		return -EINVAL;
	}

	return 0;
812
}
813
EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
814 815 816

int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
{
817
	if (flag != 0 && flag != 1) {
818
		pr_err("Illegal value %d\n", flag);
819
		return -EINVAL;
820
	}
821 822 823 824
	if (flag &&
	    dev->transport->get_write_cache) {
		pr_err("emulate_write_cache not supported for this device\n");
		return -EINVAL;
825
	}
826 827 828 829 830
	if (dev->export_count) {
		pr_err("emulate_write_cache cannot be changed with active"
		       " exports: %d\n", dev->export_count);
		return -EINVAL;
	}
831
	dev->dev_attrib.emulate_write_cache = flag;
832
	pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
833
			dev, dev->dev_attrib.emulate_write_cache);
834 835
	return 0;
}
836
EXPORT_SYMBOL(se_dev_set_emulate_write_cache);
837 838 839 840

int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
{
	if ((flag != 0) && (flag != 1) && (flag != 2)) {
841
		pr_err("Illegal value %d\n", flag);
842
		return -EINVAL;
843 844
	}

845
	if (dev->export_count) {
846
		pr_err("dev[%p]: Unable to change SE Device"
847 848
			" UA_INTRLCK_CTRL while export_count is %d\n",
			dev, dev->export_count);
849
		return -EINVAL;
850
	}
851
	dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
852
	pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
853
		dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
854 855 856

	return 0;
}
857
EXPORT_SYMBOL(se_dev_set_emulate_ua_intlck_ctrl);
858 859 860 861

int se_dev_set_emulate_tas(struct se_device *dev, int flag)
{
	if ((flag != 0) && (flag != 1)) {
862
		pr_err("Illegal value %d\n", flag);
863
		return -EINVAL;
864 865
	}

866
	if (dev->export_count) {
867
		pr_err("dev[%p]: Unable to change SE Device TAS while"
868 869
			" export_count is %d\n",
			dev, dev->export_count);
870
		return -EINVAL;
871
	}
872
	dev->dev_attrib.emulate_tas = flag;
873
	pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
874
		dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
875 876 877

	return 0;
}
878
EXPORT_SYMBOL(se_dev_set_emulate_tas);
879 880 881 882

int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
{
	if ((flag != 0) && (flag != 1)) {
883
		pr_err("Illegal value %d\n", flag);
884
		return -EINVAL;
885 886 887 888 889
	}
	/*
	 * We expect this value to be non-zero when generic Block Layer
	 * Discard supported is detected iblock_create_virtdevice().
	 */
890
	if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
891
		pr_err("Generic Block Discard not supported\n");
892 893 894
		return -ENOSYS;
	}

895
	dev->dev_attrib.emulate_tpu = flag;
896
	pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
897 898 899
				dev, flag);
	return 0;
}
900
EXPORT_SYMBOL(se_dev_set_emulate_tpu);
901 902 903 904

int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
{
	if ((flag != 0) && (flag != 1)) {
905
		pr_err("Illegal value %d\n", flag);
906
		return -EINVAL;
907 908 909 910 911
	}
	/*
	 * We expect this value to be non-zero when generic Block Layer
	 * Discard supported is detected iblock_create_virtdevice().
	 */
912
	if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
913
		pr_err("Generic Block Discard not supported\n");
914 915 916
		return -ENOSYS;
	}

917
	dev->dev_attrib.emulate_tpws = flag;
918
	pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
919 920 921
				dev, flag);
	return 0;
}
922
EXPORT_SYMBOL(se_dev_set_emulate_tpws);
923

924 925 926 927 928 929 930 931 932 933 934 935
int se_dev_set_emulate_caw(struct se_device *dev, int flag)
{
	if (flag != 0 && flag != 1) {
		pr_err("Illegal value %d\n", flag);
		return -EINVAL;
	}
	dev->dev_attrib.emulate_caw = flag;
	pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
		 dev, flag);

	return 0;
}
936
EXPORT_SYMBOL(se_dev_set_emulate_caw);
937

938 939 940 941 942 943 944 945 946 947 948 949
int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
{
	if (flag != 0 && flag != 1) {
		pr_err("Illegal value %d\n", flag);
		return -EINVAL;
	}
	dev->dev_attrib.emulate_3pc = flag;
	pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
		dev, flag);

	return 0;
}
950
EXPORT_SYMBOL(se_dev_set_emulate_3pc);
951

952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
{
	int rc, old_prot = dev->dev_attrib.pi_prot_type;

	if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
		pr_err("Illegal value %d for pi_prot_type\n", flag);
		return -EINVAL;
	}
	if (flag == 2) {
		pr_err("DIF TYPE2 protection currently not supported\n");
		return -ENOSYS;
	}
	if (dev->dev_attrib.hw_pi_prot_type) {
		pr_warn("DIF protection enabled on underlying hardware,"
			" ignoring\n");
		return 0;
	}
	if (!dev->transport->init_prot || !dev->transport->free_prot) {
970 971 972 973
		/* 0 is only allowed value for non-supporting backends */
		if (flag == 0)
			return 0;

974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003
		pr_err("DIF protection not supported by backend: %s\n",
		       dev->transport->name);
		return -ENOSYS;
	}
	if (!(dev->dev_flags & DF_CONFIGURED)) {
		pr_err("DIF protection requires device to be configured\n");
		return -ENODEV;
	}
	if (dev->export_count) {
		pr_err("dev[%p]: Unable to change SE Device PROT type while"
		       " export_count is %d\n", dev, dev->export_count);
		return -EINVAL;
	}

	dev->dev_attrib.pi_prot_type = flag;

	if (flag && !old_prot) {
		rc = dev->transport->init_prot(dev);
		if (rc) {
			dev->dev_attrib.pi_prot_type = old_prot;
			return rc;
		}

	} else if (!flag && old_prot) {
		dev->transport->free_prot(dev);
	}
	pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);

	return 0;
}
1004
EXPORT_SYMBOL(se_dev_set_pi_prot_type);
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039

int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
{
	int rc;

	if (!flag)
		return 0;

	if (flag != 1) {
		pr_err("Illegal value %d for pi_prot_format\n", flag);
		return -EINVAL;
	}
	if (!dev->transport->format_prot) {
		pr_err("DIF protection format not supported by backend %s\n",
		       dev->transport->name);
		return -ENOSYS;
	}
	if (!(dev->dev_flags & DF_CONFIGURED)) {
		pr_err("DIF protection format requires device to be configured\n");
		return -ENODEV;
	}
	if (dev->export_count) {
		pr_err("dev[%p]: Unable to format SE Device PROT type while"
		       " export_count is %d\n", dev, dev->export_count);
		return -EINVAL;
	}

	rc = dev->transport->format_prot(dev);
	if (rc)
		return rc;

	pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);

	return 0;
}
1040
EXPORT_SYMBOL(se_dev_set_pi_prot_format);
1041

1042 1043 1044
int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
{
	if ((flag != 0) && (flag != 1)) {
1045
		pr_err("Illegal value %d\n", flag);
1046
		return -EINVAL;
1047
	}
1048
	dev->dev_attrib.enforce_pr_isids = flag;
1049
	pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1050
		(dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1051 1052
	return 0;
}
1053
EXPORT_SYMBOL(se_dev_set_enforce_pr_isids);
1054

1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
{
	if ((flag != 0) && (flag != 1)) {
		printk(KERN_ERR "Illegal value %d\n", flag);
		return -EINVAL;
	}
	if (dev->export_count) {
		pr_err("dev[%p]: Unable to set force_pr_aptpl while"
		       " export_count is %d\n", dev, dev->export_count);
		return -EINVAL;
	}

	dev->dev_attrib.force_pr_aptpl = flag;
	pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
	return 0;
}
1071
EXPORT_SYMBOL(se_dev_set_force_pr_aptpl);
1072

1073 1074 1075 1076 1077 1078
int se_dev_set_is_nonrot(struct se_device *dev, int flag)
{
	if ((flag != 0) && (flag != 1)) {
		printk(KERN_ERR "Illegal value %d\n", flag);
		return -EINVAL;
	}
1079
	dev->dev_attrib.is_nonrot = flag;
1080
	pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1081 1082 1083
	       dev, flag);
	return 0;
}
1084
EXPORT_SYMBOL(se_dev_set_is_nonrot);
1085

1086 1087 1088 1089 1090 1091 1092
int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
{
	if (flag != 0) {
		printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
			" reordering not implemented\n", dev);
		return -ENOSYS;
	}
1093
	dev->dev_attrib.emulate_rest_reord = flag;
1094 1095 1096
	pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
	return 0;
}
1097
EXPORT_SYMBOL(se_dev_set_emulate_rest_reord);
1098

1099 1100 1101 1102 1103
/*
 * Note, this can only be called on unexported SE Device Object.
 */
int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
{
1104
	if (dev->export_count) {
1105
		pr_err("dev[%p]: Unable to change SE Device TCQ while"
1106 1107
			" export_count is %d\n",
			dev, dev->export_count);
1108
		return -EINVAL;
1109
	}
1110 1111
	if (!queue_depth) {
		pr_err("dev[%p]: Illegal ZERO value for queue"
1112
			"_depth\n", dev);
1113
		return -EINVAL;
1114 1115
	}

1116
	if (queue_depth > dev->dev_attrib.queue_depth) {
1117
		if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1118 1119 1120
			pr_err("dev[%p]: Passed queue_depth:"
				" %u exceeds TCM/SE_Device MAX"
				" TCQ: %u\n", dev, queue_depth,
1121
				dev->dev_attrib.hw_queue_depth);
1122
			return -EINVAL;
1123 1124
		}
	}
1125
	dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1126
	pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1127 1128 1129
			dev, queue_depth);
	return 0;
}
1130
EXPORT_SYMBOL(se_dev_set_queue_depth);
1131 1132 1133

int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
{
1134
	if (dev->export_count) {
1135
		pr_err("dev[%p]: Unable to change SE Device"
1136 1137
			" optimal_sectors while export_count is %d\n",
			dev, dev->export_count);
1138 1139
		return -EINVAL;
	}
1140
	if (optimal_sectors > dev->dev_attrib.hw_max_sectors) {
1141
		pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1142 1143
			" greater than hw_max_sectors: %u\n", dev,
			optimal_sectors, dev->dev_attrib.hw_max_sectors);
1144 1145 1146
		return -EINVAL;
	}

1147
	dev->dev_attrib.optimal_sectors = optimal_sectors;
1148
	pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1149 1150 1151
			dev, optimal_sectors);
	return 0;
}
1152
EXPORT_SYMBOL(se_dev_set_optimal_sectors);
1153 1154 1155

int se_dev_set_block_size(struct se_device *dev, u32 block_size)
{
1156
	if (dev->export_count) {
1157
		pr_err("dev[%p]: Unable to change SE Device block_size"
1158 1159
			" while export_count is %d\n",
			dev, dev->export_count);
1160
		return -EINVAL;
1161 1162 1163 1164 1165 1166
	}

	if ((block_size != 512) &&
	    (block_size != 1024) &&
	    (block_size != 2048) &&
	    (block_size != 4096)) {
1167
		pr_err("dev[%p]: Illegal value for block_device: %u"
1168 1169
			" for SE device, must be 512, 1024, 2048 or 4096\n",
			dev, block_size);
1170
		return -EINVAL;
1171 1172
	}

1173
	dev->dev_attrib.block_size = block_size;
1174
	pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1175
			dev, block_size);
1176 1177 1178 1179 1180

	if (dev->dev_attrib.max_bytes_per_io)
		dev->dev_attrib.hw_max_sectors =
			dev->dev_attrib.max_bytes_per_io / block_size;

1181 1182
	return 0;
}
1183
EXPORT_SYMBOL(se_dev_set_block_size);
1184 1185 1186 1187

struct se_lun *core_dev_add_lun(
	struct se_portal_group *tpg,
	struct se_device *dev,
1188
	u32 unpacked_lun)
1189
{
1190
	struct se_lun *lun;
1191
	int rc;
1192

1193
	lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1194 1195
	if (IS_ERR(lun))
		return lun;
1196

1197
	rc = core_tpg_add_lun(tpg, lun,
1198
				TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1199 1200
	if (rc < 0)
		return ERR_PTR(rc);
1201

1202
	pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1203
		" CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1204
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1205
		tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1206 1207 1208 1209
	/*
	 * Update LUN maps for dynamically added initiators when
	 * generate_node_acl is enabled.
	 */
1210
	if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1211
		struct se_node_acl *acl;
1212
		spin_lock_irq(&tpg->acl_node_lock);
1213
		list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1214 1215 1216
			if (acl->dynamic_node_acl &&
			    (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
			     !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1217
				spin_unlock_irq(&tpg->acl_node_lock);
1218
				core_tpg_add_node_to_devs(acl, tpg);
1219
				spin_lock_irq(&tpg->acl_node_lock);
1220 1221
			}
		}
1222
		spin_unlock_irq(&tpg->acl_node_lock);
1223 1224
	}

1225
	return lun;
1226 1227 1228 1229 1230 1231
}

/*      core_dev_del_lun():
 *
 *
 */
1232
void core_dev_del_lun(
1233
	struct se_portal_group *tpg,
1234
	struct se_lun *lun)
1235
{
1236
	pr_debug("%s_TPG[%u]_LUN[%u] - Deactivating %s Logical Unit from"
1237
		" device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1238
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1239
		tpg->se_tpg_tfo->get_fabric_name());
1240

1241
	core_tpg_remove_lun(tpg, lun);
1242 1243 1244 1245 1246 1247 1248 1249
}

struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
{
	struct se_lun *lun;

	spin_lock(&tpg->tpg_lun_lock);
	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1250
		pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1251
			"_PER_TPG-1: %u for Target Portal Group: %hu\n",
1252
			tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1253
			TRANSPORT_MAX_LUNS_PER_TPG-1,
1254
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
1255 1256 1257
		spin_unlock(&tpg->tpg_lun_lock);
		return NULL;
	}
1258
	lun = tpg->tpg_lun_list[unpacked_lun];
1259 1260

	if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1261
		pr_err("%s Logical Unit Number: %u is not free on"
1262
			" Target Portal Group: %hu, ignoring request.\n",
1263 1264
			tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
		spin_unlock(&tpg->tpg_lun_lock);
		return NULL;
	}
	spin_unlock(&tpg->tpg_lun_lock);

	return lun;
}

/*      core_dev_get_lun():
 *
 *
 */
static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
{
	struct se_lun *lun;

	spin_lock(&tpg->tpg_lun_lock);
	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1283
		pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1284
			"_TPG-1: %u for Target Portal Group: %hu\n",
1285
			tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1286
			TRANSPORT_MAX_LUNS_PER_TPG-1,
1287
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
1288 1289 1290
		spin_unlock(&tpg->tpg_lun_lock);
		return NULL;
	}
1291
	lun = tpg->tpg_lun_list[unpacked_lun];
1292 1293

	if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1294
		pr_err("%s Logical Unit Number: %u is not active on"
1295
			" Target Portal Group: %hu, ignoring request.\n",
1296 1297
			tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
		spin_unlock(&tpg->tpg_lun_lock);
		return NULL;
	}
	spin_unlock(&tpg->tpg_lun_lock);

	return lun;
}

struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
	struct se_portal_group *tpg,
1308
	struct se_node_acl *nacl,
1309 1310 1311 1312 1313
	u32 mapped_lun,
	int *ret)
{
	struct se_lun_acl *lacl;

1314
	if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1315
		pr_err("%s InitiatorName exceeds maximum size.\n",
1316
			tpg->se_tpg_tfo->get_fabric_name());
1317 1318 1319 1320
		*ret = -EOVERFLOW;
		return NULL;
	}
	lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1321 1322
	if (!lacl) {
		pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1323 1324 1325 1326 1327 1328 1329
		*ret = -ENOMEM;
		return NULL;
	}

	INIT_LIST_HEAD(&lacl->lacl_list);
	lacl->mapped_lun = mapped_lun;
	lacl->se_lun_nacl = nacl;
1330 1331
	snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
		 nacl->initiatorname);
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345

	return lacl;
}

int core_dev_add_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_lun_acl *lacl,
	u32 unpacked_lun,
	u32 lun_access)
{
	struct se_lun *lun;
	struct se_node_acl *nacl;

	lun = core_dev_get_lun(tpg, unpacked_lun);
1346 1347
	if (!lun) {
		pr_err("%s Logical Unit Number: %u is not active on"
1348
			" Target Portal Group: %hu, ignoring request.\n",
1349 1350
			tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
1351 1352 1353 1354
		return -EINVAL;
	}

	nacl = lacl->se_lun_nacl;
1355
	if (!nacl)
1356 1357 1358 1359 1360 1361 1362 1363
		return -EINVAL;

	if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
	    (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
		lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;

	lacl->se_lun = lun;

1364 1365
	if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
			lun_access, nacl, tpg) < 0)
1366 1367 1368 1369
		return -EINVAL;

	spin_lock(&lun->lun_acl_lock);
	list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1370
	atomic_inc_mb(&lun->lun_acl_count);
1371 1372
	spin_unlock(&lun->lun_acl_lock);

1373
	pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1374 1375
		" InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1376 1377 1378 1379 1380 1381
		(lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
		lacl->initiatorname);
	/*
	 * Check to see if there are any existing persistent reservation APTPL
	 * pre-registrations that need to be enabled for this LUN ACL..
	 */
1382 1383
	core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
					    lacl->mapped_lun);
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
	return 0;
}

/*      core_dev_del_initiator_node_lun_acl():
 *
 *
 */
int core_dev_del_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_lun *lun,
	struct se_lun_acl *lacl)
{
	struct se_node_acl *nacl;

	nacl = lacl->se_lun_nacl;
1399
	if (!nacl)
1400 1401 1402 1403
		return -EINVAL;

	spin_lock(&lun->lun_acl_lock);
	list_del(&lacl->lacl_list);
1404
	atomic_dec_mb(&lun->lun_acl_count);
1405 1406
	spin_unlock(&lun->lun_acl_lock);

1407 1408
	core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
		TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1409 1410 1411

	lacl->se_lun = NULL;

1412
	pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1413
		" InitiatorNode: %s Mapped LUN: %u\n",
1414 1415
		tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1416 1417 1418 1419 1420 1421 1422 1423 1424
		lacl->initiatorname, lacl->mapped_lun);

	return 0;
}

void core_dev_free_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_lun_acl *lacl)
{
1425
	pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1426 1427 1428
		" Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg),
		tpg->se_tpg_tfo->get_fabric_name(),
1429 1430 1431 1432 1433
		lacl->initiatorname, lacl->mapped_lun);

	kfree(lacl);
}

1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
static void scsi_dump_inquiry(struct se_device *dev)
{
	struct t10_wwn *wwn = &dev->t10_wwn;
	char buf[17];
	int i, device_type;
	/*
	 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
	 */
	for (i = 0; i < 8; i++)
		if (wwn->vendor[i] >= 0x20)
			buf[i] = wwn->vendor[i];
		else
			buf[i] = ' ';
	buf[i] = '\0';
	pr_debug("  Vendor: %s\n", buf);

	for (i = 0; i < 16; i++)
		if (wwn->model[i] >= 0x20)
			buf[i] = wwn->model[i];
		else
			buf[i] = ' ';
	buf[i] = '\0';
	pr_debug("  Model: %s\n", buf);

	for (i = 0; i < 4; i++)
		if (wwn->revision[i] >= 0x20)
			buf[i] = wwn->revision[i];
		else
			buf[i] = ' ';
	buf[i] = '\0';
	pr_debug("  Revision: %s\n", buf);

	device_type = dev->transport->get_device_type(dev);
	pr_debug("  Type:   %s ", scsi_device_type(device_type));
}

struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
{
	struct se_device *dev;
1473
	struct se_lun *xcopy_lun;
1474 1475 1476 1477 1478

	dev = hba->transport->alloc_device(hba, name);
	if (!dev)
		return NULL;

1479
	dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1480 1481
	dev->se_hba = hba;
	dev->transport = hba->transport;
1482
	dev->prot_length = sizeof(struct se_dif_v1_tuple);
1483 1484 1485 1486 1487 1488 1489

	INIT_LIST_HEAD(&dev->dev_list);
	INIT_LIST_HEAD(&dev->dev_sep_list);
	INIT_LIST_HEAD(&dev->dev_tmr_list);
	INIT_LIST_HEAD(&dev->delayed_cmd_list);
	INIT_LIST_HEAD(&dev->state_list);
	INIT_LIST_HEAD(&dev->qf_cmd_list);
1490
	INIT_LIST_HEAD(&dev->g_dev_node);
1491 1492 1493 1494 1495 1496
	spin_lock_init(&dev->execute_task_lock);
	spin_lock_init(&dev->delayed_cmd_lock);
	spin_lock_init(&dev->dev_reservation_lock);
	spin_lock_init(&dev->se_port_lock);
	spin_lock_init(&dev->se_tmr_lock);
	spin_lock_init(&dev->qf_cmd_lock);
1497
	sema_init(&dev->caw_sem, 1);
1498 1499 1500 1501 1502 1503 1504 1505 1506
	atomic_set(&dev->dev_ordered_id, 0);
	INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
	spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
	INIT_LIST_HEAD(&dev->t10_pr.registration_list);
	INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
	spin_lock_init(&dev->t10_pr.registration_lock);
	spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
	INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
	spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1507 1508
	INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
	spin_lock_init(&dev->t10_alua.lba_map_lock);
1509 1510 1511 1512 1513

	dev->t10_wwn.t10_dev = dev;
	dev->t10_alua.t10_dev = dev;

	dev->dev_attrib.da_dev = dev;
1514
	dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1515 1516 1517 1518 1519 1520 1521 1522
	dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
	dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
	dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
	dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
	dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
	dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
	dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
	dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1523
	dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1524
	dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1525
	dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1526
	dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1527
	dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
1528 1529 1530 1531 1532 1533 1534 1535
	dev->dev_attrib.is_nonrot = DA_IS_NONROT;
	dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
	dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
	dev->dev_attrib.max_unmap_block_desc_count =
		DA_MAX_UNMAP_BLOCK_DESC_COUNT;
	dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
	dev->dev_attrib.unmap_granularity_alignment =
				DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1536
	dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1537

1538 1539 1540 1541 1542 1543 1544 1545
	xcopy_lun = &dev->xcopy_lun;
	xcopy_lun->lun_se_dev = dev;
	init_completion(&xcopy_lun->lun_shutdown_comp);
	INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
	spin_lock_init(&xcopy_lun->lun_acl_lock);
	spin_lock_init(&xcopy_lun->lun_sep_lock);
	init_completion(&xcopy_lun->lun_ref_comp);

1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
	return dev;
}

int target_configure_device(struct se_device *dev)
{
	struct se_hba *hba = dev->se_hba;
	int ret;

	if (dev->dev_flags & DF_CONFIGURED) {
		pr_err("se_dev->se_dev_ptr already set for storage"
				" object\n");
		return -EEXIST;
	}

	ret = dev->transport->configure_device(dev);
	if (ret)
		goto out;
	/*
	 * XXX: there is not much point to have two different values here..
	 */
	dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
	dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;

	/*
	 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
	 */
	dev->dev_attrib.hw_max_sectors =
		se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
					 dev->dev_attrib.hw_block_size);
1575
	dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618

	dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
	dev->creation_time = get_jiffies_64();

	ret = core_setup_alua(dev);
	if (ret)
		goto out;

	/*
	 * Startup the struct se_device processing thread
	 */
	dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
				      dev->transport->name);
	if (!dev->tmr_wq) {
		pr_err("Unable to create tmr workqueue for %s\n",
			dev->transport->name);
		ret = -ENOMEM;
		goto out_free_alua;
	}

	/*
	 * Setup work_queue for QUEUE_FULL
	 */
	INIT_WORK(&dev->qf_work_queue, target_qf_do_work);

	/*
	 * Preload the initial INQUIRY const values if we are doing
	 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
	 * passthrough because this is being provided by the backend LLD.
	 */
	if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
		strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
		strncpy(&dev->t10_wwn.model[0],
			dev->transport->inquiry_prod, 16);
		strncpy(&dev->t10_wwn.revision[0],
			dev->transport->inquiry_rev, 4);
	}

	scsi_dump_inquiry(dev);

	spin_lock(&hba->device_lock);
	hba->dev_count++;
	spin_unlock(&hba->device_lock);
1619 1620 1621 1622 1623

	mutex_lock(&g_device_mutex);
	list_add_tail(&dev->g_dev_node, &g_device_list);
	mutex_unlock(&g_device_mutex);

1624 1625
	dev->dev_flags |= DF_CONFIGURED;

1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643
	return 0;

out_free_alua:
	core_alua_free_lu_gp_mem(dev);
out:
	se_release_vpd_for_dev(dev);
	return ret;
}

void target_free_device(struct se_device *dev)
{
	struct se_hba *hba = dev->se_hba;

	WARN_ON(!list_empty(&dev->dev_sep_list));

	if (dev->dev_flags & DF_CONFIGURED) {
		destroy_workqueue(dev->tmr_wq);

1644 1645 1646 1647
		mutex_lock(&g_device_mutex);
		list_del(&dev->g_dev_node);
		mutex_unlock(&g_device_mutex);

1648 1649 1650 1651 1652 1653
		spin_lock(&hba->device_lock);
		hba->dev_count--;
		spin_unlock(&hba->device_lock);
	}

	core_alua_free_lu_gp_mem(dev);
1654
	core_alua_set_lba_map(dev, NULL, 0, 0);
1655 1656 1657
	core_scsi3_free_all_registrations(dev);
	se_release_vpd_for_dev(dev);

1658 1659 1660
	if (dev->transport->free_prot)
		dev->transport->free_prot(dev);

1661 1662 1663
	dev->transport->free_device(dev);
}

1664 1665 1666 1667
int core_dev_setup_virtual_lun0(void)
{
	struct se_hba *hba;
	struct se_device *dev;
1668
	char buf[] = "rd_pages=8,rd_nullio=1";
1669 1670
	int ret;

1671
	hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1672 1673 1674
	if (IS_ERR(hba))
		return PTR_ERR(hba);

1675 1676
	dev = target_alloc_device(hba, "virt_lun0");
	if (!dev) {
1677
		ret = -ENOMEM;
1678
		goto out_free_hba;
1679 1680
	}

1681
	hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1682

1683 1684 1685
	ret = target_configure_device(dev);
	if (ret)
		goto out_free_se_dev;
1686

1687 1688
	lun0_hba = hba;
	g_lun0_dev = dev;
1689
	return 0;
1690 1691 1692 1693 1694

out_free_se_dev:
	target_free_device(dev);
out_free_hba:
	core_delete_hba(hba);
1695 1696 1697 1698 1699 1700
	return ret;
}


void core_dev_release_virtual_lun0(void)
{
1701
	struct se_hba *hba = lun0_hba;
1702

1703
	if (!hba)
1704 1705
		return;

1706
	if (g_lun0_dev)
1707
		target_free_device(g_lun0_dev);
1708 1709
	core_delete_hba(hba);
}