Release 4.11 drivers/target/target_core_device.c

/*******************************************************************************
 * Filename:  target_core_device.c (based on iscsi_target_device.c)
 *
 * This file contains the TCM Virtual Device and Disk Transport
 * agnostic related functions.
 *
 * (c) Copyright 2003-2013 Datera, Inc.
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 ******************************************************************************/

#include <linux/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>
#include <linux/export.h>
#include <linux/t10-pi.h>
#include <asm/unaligned.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi_common.h>
#include <scsi/scsi_proto.h>

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

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


DEFINE_MUTEX(g_device_mutex);

LIST_HEAD(g_device_list);


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

struct se_device *g_lun0_dev;


sense_reason_t

transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
{
	struct se_lun *se_lun = NULL;
	struct se_session *se_sess = se_cmd->se_sess;
	struct se_node_acl *nacl = se_sess->se_node_acl;
	struct se_dev_entry *deve;
	sense_reason_t ret = TCM_NO_SENSE;

	rcu_read_lock();
	deve = target_nacl_find_deve(nacl, unpacked_lun);
	if (deve) {
		atomic_long_inc(&deve->total_cmds);

		if (se_cmd->data_direction == DMA_TO_DEVICE)
			atomic_long_add(se_cmd->data_length,
					&deve->write_bytes);
		else if (se_cmd->data_direction == DMA_FROM_DEVICE)
			atomic_long_add(se_cmd->data_length,
					&deve->read_bytes);

		se_lun = rcu_dereference(deve->se_lun);

		if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
			se_lun = NULL;
			goto out_unlock;
		}

		se_cmd->se_lun = rcu_dereference(deve->se_lun);
		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;
		se_cmd->lun_ref_active = true;

		if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
		    deve->lun_access_ro) {
			pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
				" Access for 0x%08llx\n",
				se_cmd->se_tfo->get_fabric_name(),
				unpacked_lun);
			rcu_read_unlock();
			ret = TCM_WRITE_PROTECTED;
			goto ref_dev;
		}
	}
out_unlock:
	rcu_read_unlock();

	if (!se_lun) {
		/*
                 * 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) {
			pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
				" Access for 0x%08llx\n",
				se_cmd->se_tfo->get_fabric_name(),
				unpacked_lun);
			return TCM_NON_EXISTENT_LUN;
		}

		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;

		percpu_ref_get(&se_lun->lun_ref);
		se_cmd->lun_ref_active = true;

		/*
                 * Force WRITE PROTECT for virtual LUN 0
                 */
		if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
		    (se_cmd->data_direction != DMA_NONE)) {
			ret = TCM_WRITE_PROTECTED;
			goto ref_dev;
		}
	}
	/*
         * RCU reference protected by percpu se_lun->lun_ref taken above that
         * must drop to zero (including initial reference) before this se_lun
         * pointer can be kfree_rcu() by the final se_lun->lun_group put via
         * target_core_fabric_configfs.c:target_fabric_port_release
         */
ref_dev:
	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
	atomic_long_inc(&se_cmd->se_dev->num_cmds);

	if (se_cmd->data_direction == DMA_TO_DEVICE)
		atomic_long_add(se_cmd->data_length,
				&se_cmd->se_dev->write_bytes);
	else if (se_cmd->data_direction == DMA_FROM_DEVICE)
		atomic_long_add(se_cmd->data_length,
				&se_cmd->se_dev->read_bytes);

	return ret;
}
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2
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1
7.69%
Christoph Hellwig
2
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1
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405
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13
100.00%


EXPORT_SYMBOL(transport_lookup_cmd_lun);



int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
{
	struct se_dev_entry *deve;
	struct se_lun *se_lun = NULL;
	struct se_session *se_sess = se_cmd->se_sess;
	struct se_node_acl *nacl = se_sess->se_node_acl;
	struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
	unsigned long flags;

	rcu_read_lock();
	deve = target_nacl_find_deve(nacl, unpacked_lun);
	if (deve) {
		se_cmd->se_lun = rcu_dereference(deve->se_lun);
		se_lun = rcu_dereference(deve->se_lun);
		se_cmd->pr_res_key = deve->pr_res_key;
		se_cmd->orig_fe_lun = unpacked_lun;
	}
	rcu_read_unlock();

	if (!se_lun) {
		pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
			" Access for 0x%08llx\n",
			se_cmd->se_tfo->get_fabric_name(),
			unpacked_lun);
		return -ENODEV;
	}
	/*
         * XXX: Add percpu se_lun->lun_ref reference count for TMR
         */
	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
	se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);

	spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
	list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
	spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);

	return 0;
}
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Roland Dreier
10
4.95%
1
11.11%
Hannes Reinecke
2
0.99%
1
11.11%
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202
100.00%
9
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EXPORT_SYMBOL(transport_lookup_tmr_lun);



bool target_lun_is_rdonly(struct se_cmd *cmd)
{
	struct se_session *se_sess = cmd->se_sess;
	struct se_dev_entry *deve;
	bool ret;

	rcu_read_lock();
	deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
	ret = deve && deve->lun_access_ro;
	rcu_read_unlock();

	return ret;
}
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57
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3
100.00%


EXPORT_SYMBOL(target_lun_is_rdonly);

/*
 * This function is called from core_scsi3_emulate_pro_register_and_move()
 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 * 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_portal_group *tpg = nacl->se_tpg;

	rcu_read_lock();
	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
		lun = rcu_dereference(deve->se_lun);
		if (!lun) {
			pr_err("%s device entries device pointer is"
				" NULL, but Initiator has access.\n",
				tpg->se_tpg_tfo->get_fabric_name());
			continue;
		}
		if (lun->lun_rtpi != rtpi)
			continue;

		kref_get(&deve->pr_kref);
		rcu_read_unlock();

		return deve;
	}
	rcu_read_unlock();

	return NULL;
}

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4
100.00%



void core_free_device_list_for_node(
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	struct se_dev_entry *deve;

	mutex_lock(&nacl->lun_entry_mutex);
	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
		struct se_lun *lun = rcu_dereference_check(deve->se_lun,
					lockdep_is_held(&nacl->lun_entry_mutex));
		core_disable_device_list_for_node(lun, deve, nacl, tpg);
	}
	mutex_unlock(&nacl->lun_entry_mutex);
}

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3
100.00%



void core_update_device_list_access(
	u64 mapped_lun,
	bool lun_access_ro,
	struct se_node_acl *nacl)
{
	struct se_dev_entry *deve;

	mutex_lock(&nacl->lun_entry_mutex);
	deve = target_nacl_find_deve(nacl, mapped_lun);
	if (deve)
		deve->lun_access_ro = lun_access_ro;
	mutex_unlock(&nacl->lun_entry_mutex);
}

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1
1.79%
1
25.00%
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56
100.00%
4
100.00%

/*
 * Called with rcu_read_lock or nacl->device_list_lock held.
 */


struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
{
	struct se_dev_entry *deve;

	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
		if (deve->mapped_lun == mapped_lun)
			return deve;

	return NULL;
}
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42
100.00%
3
100.00%


EXPORT_SYMBOL(target_nacl_find_deve);



void target_pr_kref_release(struct kref *kref)
{
	struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
						 pr_kref);
	complete(&deve->pr_comp);
}

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static void

target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
			     bool skip_new)
{
	struct se_dev_entry *tmp;

	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
		if (skip_new && tmp == new)
			continue;
		core_scsi3_ua_allocate(tmp, 0x3F,
				       ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
	}
	rcu_read_unlock();
}

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int core_enable_device_list_for_node(
	struct se_lun *lun,
	struct se_lun_acl *lun_acl,
	u64 mapped_lun,
	bool lun_access_ro,
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	struct se_dev_entry *orig, *new;

	new = kzalloc(sizeof(*new), GFP_KERNEL);
	if (!new) {
		pr_err("Unable to allocate se_dev_entry memory\n");
		return -ENOMEM;
	}

	atomic_set(&new->ua_count, 0);
	spin_lock_init(&new->ua_lock);
	INIT_LIST_HEAD(&new->ua_list);
	INIT_LIST_HEAD(&new->lun_link);

	new->mapped_lun = mapped_lun;
	kref_init(&new->pr_kref);
	init_completion(&new->pr_comp);

	new->lun_access_ro = lun_access_ro;
	new->creation_time = get_jiffies_64();
	new->attach_count++;

	mutex_lock(&nacl->lun_entry_mutex);
	orig = target_nacl_find_deve(nacl, mapped_lun);
	if (orig && orig->se_lun) {
		struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
					lockdep_is_held(&nacl->lun_entry_mutex));

		if (orig_lun != lun) {
			pr_err("Existing orig->se_lun doesn't match new lun"
			       " for dynamic -> explicit NodeACL conversion:"
				" %s\n", nacl->initiatorname);
			mutex_unlock(&nacl->lun_entry_mutex);
			kfree(new);
			return -EINVAL;
		}
		if (orig->se_lun_acl != NULL) {
			pr_warn_ratelimited("Detected existing explicit"
				" se_lun_acl->se_lun_group reference for %s"
				" mapped_lun: %llu, failing\n",
				 nacl->initiatorname, mapped_lun);
			mutex_unlock(&nacl->lun_entry_mutex);
			kfree(new);
			return -EINVAL;
		}

		rcu_assign_pointer(new->se_lun, lun);
		rcu_assign_pointer(new->se_lun_acl, lun_acl);
		hlist_del_rcu(&orig->link);
		hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
		mutex_unlock(&nacl->lun_entry_mutex);

		spin_lock(&lun->lun_deve_lock);
		list_del(&orig->lun_link);
		list_add_tail(&new->lun_link, &lun->lun_deve_list);
		spin_unlock(&lun->lun_deve_lock);

		kref_put(&orig->pr_kref, target_pr_kref_release);
		wait_for_completion(&orig->pr_comp);

		target_luns_data_has_changed(nacl, new, true);
		kfree_rcu(orig, rcu_head);
		return 0;
	}

	rcu_assign_pointer(new->se_lun, lun);
	rcu_assign_pointer(new->se_lun_acl, lun_acl);
	hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
	mutex_unlock(&nacl->lun_entry_mutex);

	spin_lock(&lun->lun_deve_lock);
	list_add_tail(&new->lun_link, &lun->lun_deve_list);
	spin_unlock(&lun->lun_deve_lock);

	target_luns_data_has_changed(nacl, new, true);
	return 0;
}

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Fubo Chen
21
4.51%
1
8.33%
Hannes Reinecke
17
3.65%
2
16.67%
Christoph Hellwig
17
3.65%
1
8.33%
Total
466
100.00%
12
100.00%

/*
 *      Called with se_node_acl->lun_entry_mutex held.
 */


void core_disable_device_list_for_node(
	struct se_lun *lun,
	struct se_dev_entry *orig,
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	/*
         * rcu_dereference_raw protected by se_lun->lun_group symlink
         * reference to se_device->dev_group.
         */
	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
	/*
         * If the MappedLUN entry is being disabled, the entry in
         * lun->lun_deve_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->lun_link from
         * lun->lun_deve_list. This also means that active UAs and
         * NodeACL context specific PR metadata for demo-mode
         * MappedLUN *deve will be released below..
         */
	spin_lock(&lun->lun_deve_lock);
	list_del(&orig->lun_link);
	spin_unlock(&lun->lun_deve_lock);
	/*
         * Disable struct se_dev_entry LUN ACL mapping
         */
	core_scsi3_ua_release_all(orig);

	hlist_del_rcu(&orig->link);
	clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
	orig->lun_access_ro = false;
	orig->creation_time = 0;
	orig->attach_count--;
	/*
         * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
         * or REGISTER_AND_MOVE PR operation to complete.
         */
	kref_put(&orig->pr_kref, target_pr_kref_release);
	wait_for_completion(&orig->pr_comp);

	rcu_assign_pointer(orig->se_lun, NULL);
	rcu_assign_pointer(orig->se_lun_acl, NULL);

	kfree_rcu(orig, rcu_head);

	core_scsi3_free_pr_reg_from_nacl(dev, nacl);
	target_luns_data_has_changed(nacl, NULL, false);
}

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9
5.49%
1
9.09%
Christoph Hellwig
6
3.66%
1
9.09%
Total
164
100.00%
11
100.00%

/*      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;

	mutex_lock(&tpg->acl_node_mutex);
	list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {

		mutex_lock(&nacl->lun_entry_mutex);
		hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
			struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
					lockdep_is_held(&nacl->lun_entry_mutex));

			if (lun != tmp_lun)
				continue;

			core_disable_device_list_for_node(lun, deve, nacl, tpg);
		}
		mutex_unlock(&nacl->lun_entry_mutex);
	}
	mutex_unlock(&tpg->acl_node_mutex);
}

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1
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100.00%
3
100.00%



int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
{
	struct se_lun *tmp;

	spin_lock(&dev->se_port_lock);
	if (dev->export_count == 0x0000ffff) {
		pr_warn("Reached dev->dev_port_count =="
				" 0x0000ffff\n");
		spin_unlock(&dev->se_port_lock);
		return -ENOSPC;
	}
again:
	/*
         * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
         * 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
         */
	lun->lun_rtpi = dev->dev_rpti_counter++;
	if (!lun->lun_rtpi)
		goto again;

	list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
		/*
                 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
                 * for 16-bit wrap..
                 */
		if (lun->lun_rtpi == tmp->lun_rtpi)
			goto again;
	}
	spin_unlock(&dev->se_port_lock);

	return 0;
}

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3
2.65%
2
28.57%
Masanari Iida
2
1.77%
1
14.29%
Total
113
100.00%
7
100.00%



static void se_release_vpd_for_dev(struct se_device *dev)
{
	struct t10_vpd *vpd, *vpd_tmp;

	spin_lock(&dev->t10_wwn.t10_vpd_lock);
	list_for_each_entry_safe(vpd, vpd_tmp,
			&dev->t10_wwn.t10_vpd_list, vpd_list) {
		list_del(&vpd->vpd_list);
		kfree(vpd);
	}
	spin_unlock(&dev->t10_wwn.t10_vpd_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Bellinger
36
56.25%
1
33.33%
Christoph Hellwig
27
42.19%
1
33.33%
Andy Grover
1
1.56%
1
33.33%
Total
64
100.00%
3
100.00%



static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
{
	u32 aligned_max_sectors;
	u32 alignment;
	/*
         * Limit max_sectors to a PAGE_SIZE aligned value for modern
         * transport_allocate_data_tasks() operation.
         */
	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);

	return aligned_max_sectors;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
42
73.68%
1
33.33%
Nicholas Bellinger
11
19.30%
1
33.33%
Andy Grover
4
7.02%
1
33.33%
Total
57
100.00%
3
100.00%



int core_dev_add_lun(
	struct se_portal_group *tpg,
	struct se_device *dev,
	struct se_lun *lun)
{
	int rc;

	rc = core_tpg_add_lun(tpg, lun, false, dev);
	if (rc < 0)
		return rc;

	pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
		" CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
		tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
	/*
         * Update LUN maps for dynamically added initiators when
         * generate_node_acl is enabled.
         */
	if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
		struct se_node_acl *acl;

		mutex_lock(&tpg->acl_node_mutex);
		list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
			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))) {
				core_tpg_add_node_to_devs(acl, tpg, lun);
			}
		}
		mutex_unlock(&tpg->acl_node_mutex);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
96
57.14%
1
7.69%
Nicholas Bellinger
38
22.62%
5
38.46%
Roland Dreier
29
17.26%
2
15.38%
Andy Grover
4
2.38%
4
30.77%
Hannes Reinecke
1
0.60%
1
7.69%
Total
168
100.00%
13
100.00%

/*      core_dev_del_lun():
 *
 *
 */


void core_dev_del_lun(
	struct se_portal_group *tpg,
	struct se_lun *lun)
{
	pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
		" device object\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
		tpg->se_tpg_tfo->get_fabric_name());

	core_tpg_remove_lun(tpg, lun);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
33
60.00%
1
20.00%
Nicholas Bellinger
13
23.64%
1
20.00%
Andy Grover
8
14.55%
2
40.00%
Hannes Reinecke
1
1.82%
1
20.00%
Total
55
100.00%
5
100.00%



struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_node_acl *nacl,
	u64 mapped_lun,
	int *ret)
{
	struct se_lun_acl *lacl;

	if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
		pr_err("%s InitiatorName exceeds maximum size.\n",
			tpg->se_tpg_tfo->get_fabric_name());
		*ret = -EOVERFLOW;
		return NULL;
	}
	lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
	if (!lacl) {
		pr_err("Unable to allocate memory for struct se_lun_acl.\n");
		*ret = -ENOMEM;
		return NULL;
	}

	lacl->mapped_lun = mapped_lun;
	lacl->se_lun_nacl = nacl;

	return lacl;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
66
58.93%
1
16.67%
Nicholas Bellinger
42
37.50%
2
33.33%
Andy Grover
3
2.68%
2
33.33%
Hannes Reinecke
1
0.89%
1
16.67%
Total
112
100.00%
6
100.00%



int core_dev_add_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_lun_acl *lacl,
	struct se_lun *lun,
	bool lun_access_ro)
{
	struct se_node_acl *nacl = lacl->se_lun_nacl;
	/*
         * rcu_dereference_raw protected by se_lun->lun_group symlink
         * reference to se_device->dev_group.
         */
	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);

	if (!nacl)
		return -EINVAL;

	if (lun->lun_access_ro)
		lun_access_ro = true;

	lacl->se_lun = lun;

	if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
			lun_access_ro, nacl, tpg) < 0)
		return -EINVAL;

	pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
		" InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
		lun_access_ro ? "RO" : "RW",
		nacl->initiatorname);
	/*
         * Check to see if there are any existing persistent reservation APTPL
         * pre-registrations that need to be enabled for this LUN ACL..
         */
	core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
					    lacl->mapped_lun);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Bellinger
73
47.40%
4
36.36%
Christoph Hellwig
63
40.91%
1
9.09%
Andy Grover
14
9.09%
3
27.27%
Sebastian Andrzej Siewior
2
1.30%
1
9.09%
Hannes Reinecke
1
0.65%
1
9.09%
Chris Zankel
1
0.65%
1
9.09%
Total
154
100.00%
11
100.00%



int core_dev_del_initiator_node_lun_acl(
	struct se_lun *lun,
	struct se_lun_acl *lacl)
{
	struct se_portal_group *tpg = lun->lun_tpg;
	struct se_node_acl *nacl;
	struct se_dev_entry *deve;

	nacl = lacl->se_lun_nacl;
	if (!nacl)
		return -EINVAL;

	mutex_lock(&nacl->lun_entry_mutex);
	deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
	if (deve)
		core_disable_device_list_for_node(lun, deve, nacl, tpg);
	mutex_unlock(&nacl->lun_entry_mutex);

	pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
		" InitiatorNode: %s Mapped LUN: %llu\n",
		tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
		nacl->initiatorname, lacl->mapped_lun);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Bellinger
64
50.00%
3
33.33%
Christoph Hellwig
55
42.97%
2
22.22%
Andy Grover
6
4.69%
2
22.22%
Hannes Reinecke
2
1.56%
1
11.11%
Chris Zankel
1
0.78%
1
11.11%
Total
128
100.00%
9
100.00%



void core_dev_free_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_lun_acl *lacl)
{
	pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
		" Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg),
		tpg->se_tpg_tfo->get_fabric_name(),
		lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);

	kfree(lacl);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Bellinger
35
59.32%
1
20.00%
Christoph Hellwig
14
23.73%
1
20.00%
Andy Grover
7
11.86%
1
20.00%
Chris Zankel
2
3.39%
1
20.00%
Hannes Reinecke
1
1.69%
1
20.00%
Total
59
100.00%
5
100.00%



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));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
191
83.77%
1
33.33%
Nicholas Bellinger
35
15.35%
1
33.33%
Andy Grover
2
0.88%
1
33.33%
Total
228
100.00%
3
100.00%



struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
{
	struct se_device *dev;
	struct se_lun *xcopy_lun;

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

	dev->dev_link_magic = SE_DEV_LINK_MAGIC;
	dev->se_hba = hba;
	dev->transport = hba->backend->ops;
	dev->prot_length = sizeof(struct t10_pi_tuple);
	dev->hba_index = hba->hba_index;

	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);
	INIT_LIST_HEAD(&dev->g_dev_node);
	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);
	sema_init(&dev->caw_sem, 1);
	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);
	INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
	spin_lock_init(&dev->t10_alua.lba_map_lock);

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

	dev->dev_attrib.da_dev = dev;
	dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
	dev->dev_attrib.emulate_dpo = 1;
	dev->dev_attrib.emulate_fua_write = 1;
	dev->dev_attrib.emulate_fua_read = 1;
	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;
	dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
	dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
	dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
	dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
	dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
	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;
	dev->dev_attrib.unmap_zeroes_data =
				DA_UNMAP_ZEROES_DATA_DEFAULT;
	dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;

	xcopy_lun = &dev->xcopy_lun;
	rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
	init_completion(&xcopy_lun->lun_ref_comp);
	init_completion(&xcopy_lun->lun_shutdown_comp);
	INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
	INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
	mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
	xcopy_lun->lun_tpg = &xcopy_pt_tpg;

	return dev;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
345
60.53%
4
19.05%
Nicholas Bellinger
185
32.46%
12
57.14%
Hannes Reinecke
20
3.51%
1
4.76%
Tregaron Bayly
8
1.40%
1
4.76%
Jamie Pocas
8
1.40%
1
4.76%
Andy Grover
3
0.53%
1
4.76%
Sagi Grimberg
1
0.18%
1
4.76%
Total
570
100.00%
21
100.00%

/*
 * Check if the underlying struct block_device request_queue supports
 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 * in ATA and we need to set TPE=1
 */


bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
				       struct request_queue *q)
{
	int block_size = queue_logical_block_size(q);

	if (!blk_queue_discard(q))
		return false;

	attrib->max_unmap_lba_count =
		q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
	/*
         * Currently hardcoded to 1 in Linux/SCSI code..
         */
	attrib->max_unmap_block_desc_count = 1;
	attrib->unmap_granularity = q->limits.discard_granularity / block_size;
	attrib->unmap_granularity_alignment = q->limits.discard_alignment /
								block_size;
	attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
	return true;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Michael Christie
97
100.00%
2
100.00%
Total
97
100.00%
2
100.00%


EXPORT_SYMBOL(target_configure_unmap_from_queue);

/*
 * Convert from blocksize advertised to the initiator to the 512 byte
 * units unconditionally used by the Linux block layer.
 */


sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
{
	switch (dev->dev_attrib.block_size) {
	case 4096:
		return lb << 3;
	case 2048:
		return lb << 2;
	case 1024:
		return lb << 1;
	default:
		return lb;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Michael Christie
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%


EXPORT_SYMBOL(target_to_linux_sector);



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);
	dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;

	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_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
		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);

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

	dev->dev_flags |= DF_CONFIGURED;

	return 0;

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
231
64.17%
1
16.67%
Nicholas Bellinger
123
34.17%
4
66.67%
Andy Grover
6
1.67%
1
16.67%
Total
360
100.00%
6
100.00%



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);

		mutex_lock(&g_device_mutex);
		list_del(&dev->g_dev_node);
		mutex_unlock(&g_device_mutex);

		spin_lock(&hba->device_lock);
		hba->dev_count--;
		spin_unlock(&hba->device_lock);
	}

	core_alua_free_lu_gp_mem(dev);
	core_alua_set_lba_map(dev, NULL, 0, 0);
	core_scsi3_free_all_registrations(dev);
	se_release_vpd_for_dev(dev);

	if (dev->transport->free_prot)
		dev->transport->free_prot(dev);

	dev->transport->free_device(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
73
51.77%
1
16.67%
Nicholas Bellinger
55
39.01%
3
50.00%
Hannes Reinecke
11
7.80%
1
16.67%
Andy Grover
2
1.42%
1
16.67%
Total
141
100.00%
6
100.00%



int core_dev_setup_virtual_lun0(void)
{
	struct se_hba *hba;
	struct se_device *dev;
	char buf[] = "rd_pages=8,rd_nullio=1";
	int ret;

	hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
	if (IS_ERR(hba))
		return PTR_ERR(hba);

	dev = target_alloc_device(hba, "virt_lun0");
	if (!dev) {
		ret = -ENOMEM;
		goto out_free_hba;
	}

	hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));

	ret = target_configure_device(dev);
	if (ret)
		goto out_free_se_dev;

	lun0_hba = hba;
	g_lun0_dev = dev;
	return 0;

out_free_se_dev:
	target_free_device(dev);
out_free_hba:
	core_delete_hba(hba);
	return ret;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Bellinger
107
79.85%
1
20.00%
Christoph Hellwig
23
17.16%
2
40.00%
Andy Grover
4
2.99%
2
40.00%
Total
134
100.00%
5
100.00%



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

	if (!hba)
		return;

	if (g_lun0_dev)
		target_free_device(g_lun0_dev);
	core_delete_hba(hba);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Bellinger
32
94.12%
1
33.33%
Andy Grover
1
2.94%
1
33.33%
Christoph Hellwig
1
2.94%
1
33.33%
Total
34
100.00%
3
100.00%

/*
 * Common CDB parsing for kernel and user passthrough.
 */

sense_reason_t

passthrough_parse_cdb(struct se_cmd *cmd,
	sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
{
	unsigned char *cdb = cmd->t_task_cdb;

	/*
         * Clear a lun set in the cdb if the initiator talking to use spoke
         * and old standards version, as we can't assume the underlying device
         * won't choke up on it.
         */
	switch (cdb[0]) {
	case READ_10: /* SBC - RDProtect */
	case READ_12: /* SBC - RDProtect */
	case READ_16: /* SBC - RDProtect */
	case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
	case VERIFY: /* SBC - VRProtect */
	case VERIFY_16: /* SBC - VRProtect */
	case WRITE_VERIFY: /* SBC - VRProtect */
	case WRITE_VERIFY_12: /* SBC - VRProtect */
	case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
		break;
	default:
		cdb[1] &= 0x1f; /* clear logical unit number */
		break;
	}

	/*
         * For REPORT LUNS we always need to emulate the response, for everything
         * else, pass it up.
         */
	if (cdb[0] == REPORT_LUNS) {
		cmd->execute_cmd = spc_emulate_report_luns;
		return TCM_NO_SENSE;
	}

	/* Set DATA_CDB flag for ops that should have it */
	switch (cdb[0]) {
	case READ_6:
	case READ_10:
	case READ_12:
	case READ_16:
	case WRITE_6:
	case WRITE_10:
	case WRITE_12:
	case WRITE_16:
	case WRITE_VERIFY:
	case WRITE_VERIFY_12:
	case 0x8e: /* WRITE_VERIFY_16 */
	case COMPARE_AND_WRITE:
	case XDWRITEREAD_10:
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		break;
	case VARIABLE_LENGTH_CMD:
		switch (get_unaligned_be16(&cdb[8])) {
		case READ_32:
		case WRITE_32:
		case 0x0c: /* WRITE_VERIFY_32 */
		case XDWRITEREAD_32:
			cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
			break;
		}
	}

	cmd->execute_cmd = exec_cmd;

	return TCM_NO_SENSE;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andy Grover
211
100.00%
1
100.00%
Total
211
100.00%
1
100.00%


EXPORT_SYMBOL(passthrough_parse_cdb);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Bellinger
2467
53.07%
34
47.89%
Christoph Hellwig
1338
28.78%
7
9.86%
Andy Grover
463
9.96%
11
15.49%
Michael Christie
160
3.44%
2
2.82%
Hannes Reinecke
128
2.75%
4
5.63%
Roland Dreier
39
0.84%
3
4.23%
Fubo Chen
21
0.45%
1
1.41%
Tregaron Bayly
8
0.17%
1
1.41%
Jamie Pocas
8
0.17%
1
1.41%
Bart Van Assche
5
0.11%
2
2.82%
Chris Zankel
4
0.09%
1
1.41%
Paul Gortmaker
3
0.06%
1
1.41%
Sebastian Andrzej Siewior
2
0.04%
1
1.41%
Masanari Iida
2
0.04%
1
1.41%
Sagi Grimberg
1
0.02%
1
1.41%
Total
4649
100.00%
71
100.00%
Directory: drivers/target

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