linux/drivers/target/target_core_tpg.c
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   1/*******************************************************************************
   2 * Filename:  target_core_tpg.c
   3 *
   4 * This file contains generic Target Portal Group related functions.
   5 *
   6 * (c) Copyright 2002-2012 RisingTide Systems LLC.
   7 *
   8 * Nicholas A. Bellinger <nab@kernel.org>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23 *
  24 ******************************************************************************/
  25
  26#include <linux/net.h>
  27#include <linux/string.h>
  28#include <linux/timer.h>
  29#include <linux/slab.h>
  30#include <linux/spinlock.h>
  31#include <linux/in.h>
  32#include <linux/export.h>
  33#include <net/sock.h>
  34#include <net/tcp.h>
  35#include <scsi/scsi.h>
  36#include <scsi/scsi_cmnd.h>
  37
  38#include <target/target_core_base.h>
  39#include <target/target_core_backend.h>
  40#include <target/target_core_fabric.h>
  41
  42#include "target_core_internal.h"
  43
  44extern struct se_device *g_lun0_dev;
  45
  46static DEFINE_SPINLOCK(tpg_lock);
  47static LIST_HEAD(tpg_list);
  48
  49/*      core_clear_initiator_node_from_tpg():
  50 *
  51 *
  52 */
  53static void core_clear_initiator_node_from_tpg(
  54        struct se_node_acl *nacl,
  55        struct se_portal_group *tpg)
  56{
  57        int i;
  58        struct se_dev_entry *deve;
  59        struct se_lun *lun;
  60
  61        spin_lock_irq(&nacl->device_list_lock);
  62        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  63                deve = nacl->device_list[i];
  64
  65                if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  66                        continue;
  67
  68                if (!deve->se_lun) {
  69                        pr_err("%s device entries device pointer is"
  70                                " NULL, but Initiator has access.\n",
  71                                tpg->se_tpg_tfo->get_fabric_name());
  72                        continue;
  73                }
  74
  75                lun = deve->se_lun;
  76                spin_unlock_irq(&nacl->device_list_lock);
  77                core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
  78                        TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
  79
  80                spin_lock_irq(&nacl->device_list_lock);
  81        }
  82        spin_unlock_irq(&nacl->device_list_lock);
  83}
  84
  85/*      __core_tpg_get_initiator_node_acl():
  86 *
  87 *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  88 */
  89struct se_node_acl *__core_tpg_get_initiator_node_acl(
  90        struct se_portal_group *tpg,
  91        const char *initiatorname)
  92{
  93        struct se_node_acl *acl;
  94
  95        list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  96                if (!strcmp(acl->initiatorname, initiatorname))
  97                        return acl;
  98        }
  99
 100        return NULL;
 101}
 102
 103/*      core_tpg_get_initiator_node_acl():
 104 *
 105 *
 106 */
 107struct se_node_acl *core_tpg_get_initiator_node_acl(
 108        struct se_portal_group *tpg,
 109        unsigned char *initiatorname)
 110{
 111        struct se_node_acl *acl;
 112
 113        spin_lock_irq(&tpg->acl_node_lock);
 114        list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 115                if (!strcmp(acl->initiatorname, initiatorname) &&
 116                    !acl->dynamic_node_acl) {
 117                        spin_unlock_irq(&tpg->acl_node_lock);
 118                        return acl;
 119                }
 120        }
 121        spin_unlock_irq(&tpg->acl_node_lock);
 122
 123        return NULL;
 124}
 125
 126/*      core_tpg_add_node_to_devs():
 127 *
 128 *
 129 */
 130void core_tpg_add_node_to_devs(
 131        struct se_node_acl *acl,
 132        struct se_portal_group *tpg)
 133{
 134        int i = 0;
 135        u32 lun_access = 0;
 136        struct se_lun *lun;
 137        struct se_device *dev;
 138
 139        spin_lock(&tpg->tpg_lun_lock);
 140        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 141                lun = tpg->tpg_lun_list[i];
 142                if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 143                        continue;
 144
 145                spin_unlock(&tpg->tpg_lun_lock);
 146
 147                dev = lun->lun_se_dev;
 148                /*
 149                 * By default in LIO-Target $FABRIC_MOD,
 150                 * demo_mode_write_protect is ON, or READ_ONLY;
 151                 */
 152                if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 153                        lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 154                } else {
 155                        /*
 156                         * Allow only optical drives to issue R/W in default RO
 157                         * demo mode.
 158                         */
 159                        if (dev->transport->get_device_type(dev) == TYPE_DISK)
 160                                lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 161                        else
 162                                lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 163                }
 164
 165                pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 166                        " access for LUN in Demo Mode\n",
 167                        tpg->se_tpg_tfo->get_fabric_name(),
 168                        tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 169                        (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 170                        "READ-WRITE" : "READ-ONLY");
 171
 172                core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 173                                lun_access, acl, tpg);
 174                spin_lock(&tpg->tpg_lun_lock);
 175        }
 176        spin_unlock(&tpg->tpg_lun_lock);
 177}
 178
 179/*      core_set_queue_depth_for_node():
 180 *
 181 *
 182 */
 183static int core_set_queue_depth_for_node(
 184        struct se_portal_group *tpg,
 185        struct se_node_acl *acl)
 186{
 187        if (!acl->queue_depth) {
 188                pr_err("Queue depth for %s Initiator Node: %s is 0,"
 189                        "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 190                        acl->initiatorname);
 191                acl->queue_depth = 1;
 192        }
 193
 194        return 0;
 195}
 196
 197void array_free(void *array, int n)
 198{
 199        void **a = array;
 200        int i;
 201
 202        for (i = 0; i < n; i++)
 203                kfree(a[i]);
 204        kfree(a);
 205}
 206
 207static void *array_zalloc(int n, size_t size, gfp_t flags)
 208{
 209        void **a;
 210        int i;
 211
 212        a = kzalloc(n * sizeof(void*), flags);
 213        if (!a)
 214                return NULL;
 215        for (i = 0; i < n; i++) {
 216                a[i] = kzalloc(size, flags);
 217                if (!a[i]) {
 218                        array_free(a, n);
 219                        return NULL;
 220                }
 221        }
 222        return a;
 223}
 224
 225/*      core_create_device_list_for_node():
 226 *
 227 *
 228 */
 229static int core_create_device_list_for_node(struct se_node_acl *nacl)
 230{
 231        struct se_dev_entry *deve;
 232        int i;
 233
 234        nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 235                        sizeof(struct se_dev_entry), GFP_KERNEL);
 236        if (!nacl->device_list) {
 237                pr_err("Unable to allocate memory for"
 238                        " struct se_node_acl->device_list\n");
 239                return -ENOMEM;
 240        }
 241        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 242                deve = nacl->device_list[i];
 243
 244                atomic_set(&deve->ua_count, 0);
 245                atomic_set(&deve->pr_ref_count, 0);
 246                spin_lock_init(&deve->ua_lock);
 247                INIT_LIST_HEAD(&deve->alua_port_list);
 248                INIT_LIST_HEAD(&deve->ua_list);
 249        }
 250
 251        return 0;
 252}
 253
 254/*      core_tpg_check_initiator_node_acl()
 255 *
 256 *
 257 */
 258struct se_node_acl *core_tpg_check_initiator_node_acl(
 259        struct se_portal_group *tpg,
 260        unsigned char *initiatorname)
 261{
 262        struct se_node_acl *acl;
 263
 264        acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 265        if (acl)
 266                return acl;
 267
 268        if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 269                return NULL;
 270
 271        acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 272        if (!acl)
 273                return NULL;
 274
 275        INIT_LIST_HEAD(&acl->acl_list);
 276        INIT_LIST_HEAD(&acl->acl_sess_list);
 277        kref_init(&acl->acl_kref);
 278        init_completion(&acl->acl_free_comp);
 279        spin_lock_init(&acl->device_list_lock);
 280        spin_lock_init(&acl->nacl_sess_lock);
 281        atomic_set(&acl->acl_pr_ref_count, 0);
 282        acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 283        snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 284        acl->se_tpg = tpg;
 285        acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 286        spin_lock_init(&acl->stats_lock);
 287        acl->dynamic_node_acl = 1;
 288
 289        tpg->se_tpg_tfo->set_default_node_attributes(acl);
 290
 291        if (core_create_device_list_for_node(acl) < 0) {
 292                tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 293                return NULL;
 294        }
 295
 296        if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 297                core_free_device_list_for_node(acl, tpg);
 298                tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 299                return NULL;
 300        }
 301        /*
 302         * Here we only create demo-mode MappedLUNs from the active
 303         * TPG LUNs if the fabric is not explicitly asking for
 304         * tpg_check_demo_mode_login_only() == 1.
 305         */
 306        if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 307            (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 308                core_tpg_add_node_to_devs(acl, tpg);
 309
 310        spin_lock_irq(&tpg->acl_node_lock);
 311        list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 312        tpg->num_node_acls++;
 313        spin_unlock_irq(&tpg->acl_node_lock);
 314
 315        pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 316                " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 317                tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 318                tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 319
 320        return acl;
 321}
 322EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 323
 324void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 325{
 326        while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 327                cpu_relax();
 328}
 329
 330void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 331{
 332        int i;
 333        struct se_lun *lun;
 334
 335        spin_lock(&tpg->tpg_lun_lock);
 336        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 337                lun = tpg->tpg_lun_list[i];
 338
 339                if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 340                    (lun->lun_se_dev == NULL))
 341                        continue;
 342
 343                spin_unlock(&tpg->tpg_lun_lock);
 344                core_dev_del_lun(tpg, lun->unpacked_lun);
 345                spin_lock(&tpg->tpg_lun_lock);
 346        }
 347        spin_unlock(&tpg->tpg_lun_lock);
 348}
 349EXPORT_SYMBOL(core_tpg_clear_object_luns);
 350
 351/*      core_tpg_add_initiator_node_acl():
 352 *
 353 *
 354 */
 355struct se_node_acl *core_tpg_add_initiator_node_acl(
 356        struct se_portal_group *tpg,
 357        struct se_node_acl *se_nacl,
 358        const char *initiatorname,
 359        u32 queue_depth)
 360{
 361        struct se_node_acl *acl = NULL;
 362
 363        spin_lock_irq(&tpg->acl_node_lock);
 364        acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 365        if (acl) {
 366                if (acl->dynamic_node_acl) {
 367                        acl->dynamic_node_acl = 0;
 368                        pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 369                                " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 370                                tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 371                        spin_unlock_irq(&tpg->acl_node_lock);
 372                        /*
 373                         * Release the locally allocated struct se_node_acl
 374                         * because * core_tpg_add_initiator_node_acl() returned
 375                         * a pointer to an existing demo mode node ACL.
 376                         */
 377                        if (se_nacl)
 378                                tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 379                                                        se_nacl);
 380                        goto done;
 381                }
 382
 383                pr_err("ACL entry for %s Initiator"
 384                        " Node %s already exists for TPG %u, ignoring"
 385                        " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 386                        initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 387                spin_unlock_irq(&tpg->acl_node_lock);
 388                return ERR_PTR(-EEXIST);
 389        }
 390        spin_unlock_irq(&tpg->acl_node_lock);
 391
 392        if (!se_nacl) {
 393                pr_err("struct se_node_acl pointer is NULL\n");
 394                return ERR_PTR(-EINVAL);
 395        }
 396        /*
 397         * For v4.x logic the se_node_acl_s is hanging off a fabric
 398         * dependent structure allocated via
 399         * struct target_core_fabric_ops->fabric_make_nodeacl()
 400         */
 401        acl = se_nacl;
 402
 403        INIT_LIST_HEAD(&acl->acl_list);
 404        INIT_LIST_HEAD(&acl->acl_sess_list);
 405        kref_init(&acl->acl_kref);
 406        init_completion(&acl->acl_free_comp);
 407        spin_lock_init(&acl->device_list_lock);
 408        spin_lock_init(&acl->nacl_sess_lock);
 409        atomic_set(&acl->acl_pr_ref_count, 0);
 410        acl->queue_depth = queue_depth;
 411        snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 412        acl->se_tpg = tpg;
 413        acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 414        spin_lock_init(&acl->stats_lock);
 415
 416        tpg->se_tpg_tfo->set_default_node_attributes(acl);
 417
 418        if (core_create_device_list_for_node(acl) < 0) {
 419                tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 420                return ERR_PTR(-ENOMEM);
 421        }
 422
 423        if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 424                core_free_device_list_for_node(acl, tpg);
 425                tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 426                return ERR_PTR(-EINVAL);
 427        }
 428
 429        spin_lock_irq(&tpg->acl_node_lock);
 430        list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 431        tpg->num_node_acls++;
 432        spin_unlock_irq(&tpg->acl_node_lock);
 433
 434done:
 435        pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 436                " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 437                tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 438                tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 439
 440        return acl;
 441}
 442EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 443
 444/*      core_tpg_del_initiator_node_acl():
 445 *
 446 *
 447 */
 448int core_tpg_del_initiator_node_acl(
 449        struct se_portal_group *tpg,
 450        struct se_node_acl *acl,
 451        int force)
 452{
 453        LIST_HEAD(sess_list);
 454        struct se_session *sess, *sess_tmp;
 455        unsigned long flags;
 456        int rc;
 457
 458        spin_lock_irq(&tpg->acl_node_lock);
 459        if (acl->dynamic_node_acl) {
 460                acl->dynamic_node_acl = 0;
 461        }
 462        list_del(&acl->acl_list);
 463        tpg->num_node_acls--;
 464        spin_unlock_irq(&tpg->acl_node_lock);
 465
 466        spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 467        acl->acl_stop = 1;
 468
 469        list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 470                                sess_acl_list) {
 471                if (sess->sess_tearing_down != 0)
 472                        continue;
 473
 474                target_get_session(sess);
 475                list_move(&sess->sess_acl_list, &sess_list);
 476        }
 477        spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 478
 479        list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 480                list_del(&sess->sess_acl_list);
 481
 482                rc = tpg->se_tpg_tfo->shutdown_session(sess);
 483                target_put_session(sess);
 484                if (!rc)
 485                        continue;
 486                target_put_session(sess);
 487        }
 488        target_put_nacl(acl);
 489        /*
 490         * Wait for last target_put_nacl() to complete in target_complete_nacl()
 491         * for active fabric session transport_deregister_session() callbacks.
 492         */
 493        wait_for_completion(&acl->acl_free_comp);
 494
 495        core_tpg_wait_for_nacl_pr_ref(acl);
 496        core_clear_initiator_node_from_tpg(acl, tpg);
 497        core_free_device_list_for_node(acl, tpg);
 498
 499        pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 500                " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 501                tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 502                tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 503
 504        return 0;
 505}
 506EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 507
 508/*      core_tpg_set_initiator_node_queue_depth():
 509 *
 510 *
 511 */
 512int core_tpg_set_initiator_node_queue_depth(
 513        struct se_portal_group *tpg,
 514        unsigned char *initiatorname,
 515        u32 queue_depth,
 516        int force)
 517{
 518        struct se_session *sess, *init_sess = NULL;
 519        struct se_node_acl *acl;
 520        unsigned long flags;
 521        int dynamic_acl = 0;
 522
 523        spin_lock_irq(&tpg->acl_node_lock);
 524        acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 525        if (!acl) {
 526                pr_err("Access Control List entry for %s Initiator"
 527                        " Node %s does not exists for TPG %hu, ignoring"
 528                        " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 529                        initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 530                spin_unlock_irq(&tpg->acl_node_lock);
 531                return -ENODEV;
 532        }
 533        if (acl->dynamic_node_acl) {
 534                acl->dynamic_node_acl = 0;
 535                dynamic_acl = 1;
 536        }
 537        spin_unlock_irq(&tpg->acl_node_lock);
 538
 539        spin_lock_irqsave(&tpg->session_lock, flags);
 540        list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 541                if (sess->se_node_acl != acl)
 542                        continue;
 543
 544                if (!force) {
 545                        pr_err("Unable to change queue depth for %s"
 546                                " Initiator Node: %s while session is"
 547                                " operational.  To forcefully change the queue"
 548                                " depth and force session reinstatement"
 549                                " use the \"force=1\" parameter.\n",
 550                                tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 551                        spin_unlock_irqrestore(&tpg->session_lock, flags);
 552
 553                        spin_lock_irq(&tpg->acl_node_lock);
 554                        if (dynamic_acl)
 555                                acl->dynamic_node_acl = 1;
 556                        spin_unlock_irq(&tpg->acl_node_lock);
 557                        return -EEXIST;
 558                }
 559                /*
 560                 * Determine if the session needs to be closed by our context.
 561                 */
 562                if (!tpg->se_tpg_tfo->shutdown_session(sess))
 563                        continue;
 564
 565                init_sess = sess;
 566                break;
 567        }
 568
 569        /*
 570         * User has requested to change the queue depth for a Initiator Node.
 571         * Change the value in the Node's struct se_node_acl, and call
 572         * core_set_queue_depth_for_node() to add the requested queue depth.
 573         *
 574         * Finally call  tpg->se_tpg_tfo->close_session() to force session
 575         * reinstatement to occur if there is an active session for the
 576         * $FABRIC_MOD Initiator Node in question.
 577         */
 578        acl->queue_depth = queue_depth;
 579
 580        if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 581                spin_unlock_irqrestore(&tpg->session_lock, flags);
 582                /*
 583                 * Force session reinstatement if
 584                 * core_set_queue_depth_for_node() failed, because we assume
 585                 * the $FABRIC_MOD has already the set session reinstatement
 586                 * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 587                 */
 588                if (init_sess)
 589                        tpg->se_tpg_tfo->close_session(init_sess);
 590
 591                spin_lock_irq(&tpg->acl_node_lock);
 592                if (dynamic_acl)
 593                        acl->dynamic_node_acl = 1;
 594                spin_unlock_irq(&tpg->acl_node_lock);
 595                return -EINVAL;
 596        }
 597        spin_unlock_irqrestore(&tpg->session_lock, flags);
 598        /*
 599         * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 600         * forcefully shutdown the $FABRIC_MOD session/nexus.
 601         */
 602        if (init_sess)
 603                tpg->se_tpg_tfo->close_session(init_sess);
 604
 605        pr_debug("Successfully changed queue depth to: %d for Initiator"
 606                " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 607                initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 608                tpg->se_tpg_tfo->tpg_get_tag(tpg));
 609
 610        spin_lock_irq(&tpg->acl_node_lock);
 611        if (dynamic_acl)
 612                acl->dynamic_node_acl = 1;
 613        spin_unlock_irq(&tpg->acl_node_lock);
 614
 615        return 0;
 616}
 617EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 618
 619/*      core_tpg_set_initiator_node_tag():
 620 *
 621 *      Initiator nodeacl tags are not used internally, but may be used by
 622 *      userspace to emulate aliases or groups.
 623 *      Returns length of newly-set tag or -EINVAL.
 624 */
 625int core_tpg_set_initiator_node_tag(
 626        struct se_portal_group *tpg,
 627        struct se_node_acl *acl,
 628        const char *new_tag)
 629{
 630        if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 631                return -EINVAL;
 632
 633        if (!strncmp("NULL", new_tag, 4)) {
 634                acl->acl_tag[0] = '\0';
 635                return 0;
 636        }
 637
 638        return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 639}
 640EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 641
 642static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 643{
 644        /* Set in core_dev_setup_virtual_lun0() */
 645        struct se_device *dev = g_lun0_dev;
 646        struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 647        u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 648        int ret;
 649
 650        lun->unpacked_lun = 0;
 651        lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 652        atomic_set(&lun->lun_acl_count, 0);
 653        init_completion(&lun->lun_shutdown_comp);
 654        INIT_LIST_HEAD(&lun->lun_acl_list);
 655        INIT_LIST_HEAD(&lun->lun_cmd_list);
 656        spin_lock_init(&lun->lun_acl_lock);
 657        spin_lock_init(&lun->lun_cmd_lock);
 658        spin_lock_init(&lun->lun_sep_lock);
 659
 660        ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 661        if (ret < 0)
 662                return ret;
 663
 664        return 0;
 665}
 666
 667static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 668{
 669        struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 670
 671        core_tpg_post_dellun(se_tpg, lun);
 672}
 673
 674int core_tpg_register(
 675        struct target_core_fabric_ops *tfo,
 676        struct se_wwn *se_wwn,
 677        struct se_portal_group *se_tpg,
 678        void *tpg_fabric_ptr,
 679        int se_tpg_type)
 680{
 681        struct se_lun *lun;
 682        u32 i;
 683
 684        se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 685                        sizeof(struct se_lun), GFP_KERNEL);
 686        if (!se_tpg->tpg_lun_list) {
 687                pr_err("Unable to allocate struct se_portal_group->"
 688                                "tpg_lun_list\n");
 689                return -ENOMEM;
 690        }
 691
 692        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 693                lun = se_tpg->tpg_lun_list[i];
 694                lun->unpacked_lun = i;
 695                lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 696                lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 697                atomic_set(&lun->lun_acl_count, 0);
 698                init_completion(&lun->lun_shutdown_comp);
 699                INIT_LIST_HEAD(&lun->lun_acl_list);
 700                INIT_LIST_HEAD(&lun->lun_cmd_list);
 701                spin_lock_init(&lun->lun_acl_lock);
 702                spin_lock_init(&lun->lun_cmd_lock);
 703                spin_lock_init(&lun->lun_sep_lock);
 704        }
 705
 706        se_tpg->se_tpg_type = se_tpg_type;
 707        se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 708        se_tpg->se_tpg_tfo = tfo;
 709        se_tpg->se_tpg_wwn = se_wwn;
 710        atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 711        INIT_LIST_HEAD(&se_tpg->acl_node_list);
 712        INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 713        INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 714        spin_lock_init(&se_tpg->acl_node_lock);
 715        spin_lock_init(&se_tpg->session_lock);
 716        spin_lock_init(&se_tpg->tpg_lun_lock);
 717
 718        if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 719                if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 720                        kfree(se_tpg);
 721                        return -ENOMEM;
 722                }
 723        }
 724
 725        spin_lock_bh(&tpg_lock);
 726        list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 727        spin_unlock_bh(&tpg_lock);
 728
 729        pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 730                " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 731                (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 732                "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 733                "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 734
 735        return 0;
 736}
 737EXPORT_SYMBOL(core_tpg_register);
 738
 739int core_tpg_deregister(struct se_portal_group *se_tpg)
 740{
 741        struct se_node_acl *nacl, *nacl_tmp;
 742
 743        pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 744                " for endpoint: %s Portal Tag %u\n",
 745                (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 746                "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 747                se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 748                se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 749
 750        spin_lock_bh(&tpg_lock);
 751        list_del(&se_tpg->se_tpg_node);
 752        spin_unlock_bh(&tpg_lock);
 753
 754        while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 755                cpu_relax();
 756        /*
 757         * Release any remaining demo-mode generated se_node_acl that have
 758         * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 759         * in transport_deregister_session().
 760         */
 761        spin_lock_irq(&se_tpg->acl_node_lock);
 762        list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 763                        acl_list) {
 764                list_del(&nacl->acl_list);
 765                se_tpg->num_node_acls--;
 766                spin_unlock_irq(&se_tpg->acl_node_lock);
 767
 768                core_tpg_wait_for_nacl_pr_ref(nacl);
 769                core_free_device_list_for_node(nacl, se_tpg);
 770                se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 771
 772                spin_lock_irq(&se_tpg->acl_node_lock);
 773        }
 774        spin_unlock_irq(&se_tpg->acl_node_lock);
 775
 776        if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 777                core_tpg_release_virtual_lun0(se_tpg);
 778
 779        se_tpg->se_tpg_fabric_ptr = NULL;
 780        array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 781        return 0;
 782}
 783EXPORT_SYMBOL(core_tpg_deregister);
 784
 785struct se_lun *core_tpg_pre_addlun(
 786        struct se_portal_group *tpg,
 787        u32 unpacked_lun)
 788{
 789        struct se_lun *lun;
 790
 791        if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 792                pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 793                        "-1: %u for Target Portal Group: %u\n",
 794                        tpg->se_tpg_tfo->get_fabric_name(),
 795                        unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 796                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
 797                return ERR_PTR(-EOVERFLOW);
 798        }
 799
 800        spin_lock(&tpg->tpg_lun_lock);
 801        lun = tpg->tpg_lun_list[unpacked_lun];
 802        if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 803                pr_err("TPG Logical Unit Number: %u is already active"
 804                        " on %s Target Portal Group: %u, ignoring request.\n",
 805                        unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 806                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
 807                spin_unlock(&tpg->tpg_lun_lock);
 808                return ERR_PTR(-EINVAL);
 809        }
 810        spin_unlock(&tpg->tpg_lun_lock);
 811
 812        return lun;
 813}
 814
 815int core_tpg_post_addlun(
 816        struct se_portal_group *tpg,
 817        struct se_lun *lun,
 818        u32 lun_access,
 819        void *lun_ptr)
 820{
 821        int ret;
 822
 823        ret = core_dev_export(lun_ptr, tpg, lun);
 824        if (ret < 0)
 825                return ret;
 826
 827        spin_lock(&tpg->tpg_lun_lock);
 828        lun->lun_access = lun_access;
 829        lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 830        spin_unlock(&tpg->tpg_lun_lock);
 831
 832        return 0;
 833}
 834
 835static void core_tpg_shutdown_lun(
 836        struct se_portal_group *tpg,
 837        struct se_lun *lun)
 838{
 839        core_clear_lun_from_tpg(lun, tpg);
 840        transport_clear_lun_from_sessions(lun);
 841}
 842
 843struct se_lun *core_tpg_pre_dellun(
 844        struct se_portal_group *tpg,
 845        u32 unpacked_lun)
 846{
 847        struct se_lun *lun;
 848
 849        if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 850                pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 851                        "-1: %u for Target Portal Group: %u\n",
 852                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 853                        TRANSPORT_MAX_LUNS_PER_TPG-1,
 854                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
 855                return ERR_PTR(-EOVERFLOW);
 856        }
 857
 858        spin_lock(&tpg->tpg_lun_lock);
 859        lun = tpg->tpg_lun_list[unpacked_lun];
 860        if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 861                pr_err("%s Logical Unit Number: %u is not active on"
 862                        " Target Portal Group: %u, ignoring request.\n",
 863                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 864                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
 865                spin_unlock(&tpg->tpg_lun_lock);
 866                return ERR_PTR(-ENODEV);
 867        }
 868        spin_unlock(&tpg->tpg_lun_lock);
 869
 870        return lun;
 871}
 872
 873int core_tpg_post_dellun(
 874        struct se_portal_group *tpg,
 875        struct se_lun *lun)
 876{
 877        core_tpg_shutdown_lun(tpg, lun);
 878
 879        core_dev_unexport(lun->lun_se_dev, tpg, lun);
 880
 881        spin_lock(&tpg->tpg_lun_lock);
 882        lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 883        spin_unlock(&tpg->tpg_lun_lock);
 884
 885        return 0;
 886}
 887
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