drivers/target/target_core_tpg.c

   1 /*******************************************************************************
   2  * Filename:  target_core_tpg.c
   3  *
   4  * This file contains generic Target Portal Group related functions.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/string.h>
  31 #include <linux/timer.h>
  32 #include <linux/slab.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/in.h>
  35 #include <linux/export.h>
  36 #include <net/sock.h>
  37 #include <net/tcp.h>
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_cmnd.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_device.h>
  43 #include <target/target_core_tpg.h>
  44 #include <target/target_core_transport.h>
  45 #include <target/target_core_fabric_ops.h>
  46
  47 #include "target_core_hba.h"
  48 #include "target_core_stat.h"
  49
  50 extern struct se_device *g_lun0_dev;
  51
  52 static DEFINE_SPINLOCK(tpg_lock);
  53 static LIST_HEAD(tpg_list);
  54
  55 /*      core_clear_initiator_node_from_tpg():
  56  *
  57  *
  58  */
  59 static void core_clear_initiator_node_from_tpg(
  60         struct se_node_acl *nacl,
  61         struct se_portal_group *tpg)
  62 {
  63         int i;
  64         struct se_dev_entry *deve;
  65         struct se_lun *lun;
  66
  67         spin_lock_irq(&nacl->device_list_lock);
  68         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  69                 deve = &nacl->device_list[i];
  70
  71                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  72                         continue;
  73
  74                 if (!deve->se_lun) {
  75                         pr_err("%s device entries device pointer is"
  76                                 " NULL, but Initiator has access.\n",
  77                                 tpg->se_tpg_tfo->get_fabric_name());
  78                         continue;
  79                 }
  80
  81                 lun = deve->se_lun;
  82                 spin_unlock_irq(&nacl->device_list_lock);
  83                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  84                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  85
  86                 spin_lock_irq(&nacl->device_list_lock);
  87         }
  88         spin_unlock_irq(&nacl->device_list_lock);
  89 }
  90
  91 /*      __core_tpg_get_initiator_node_acl():
  92  *
  93  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  94  */
  95 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  96         struct se_portal_group *tpg,
  97         const char *initiatorname)
  98 {
  99         struct se_node_acl *acl;
 100
 101         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 102                 if (!strcmp(acl->initiatorname, initiatorname))
 103                         return acl;
 104         }
 105
 106         return NULL;
 107 }
 108
 109 /*      core_tpg_get_initiator_node_acl():
 110  *
 111  *
 112  */
 113 struct se_node_acl *core_tpg_get_initiator_node_acl(
 114         struct se_portal_group *tpg,
 115         unsigned char *initiatorname)
 116 {
 117         struct se_node_acl *acl;
 118
 119         spin_lock_irq(&tpg->acl_node_lock);
 120         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 121         spin_unlock_irq(&tpg->acl_node_lock);
 122
 123         return acl;
 124 }
 125
 126 /*      core_tpg_add_node_to_devs():
 127  *
 128  *
 129  */
 130 void 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                         if (dev->dev_flags & DF_READ_ONLY)
 154                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 155                         else
 156                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 157                 } else {
 158                         /*
 159                          * Allow only optical drives to issue R/W in default RO
 160                          * demo mode.
 161                          */
 162                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 163                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 164                         else
 165                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 166                 }
 167
 168                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 169                         " access for LUN in Demo Mode\n",
 170                         tpg->se_tpg_tfo->get_fabric_name(),
 171                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 172                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 173                         "READ-WRITE" : "READ-ONLY");
 174
 175                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 176                                 lun_access, acl, tpg, 1);
 177                 spin_lock(&tpg->tpg_lun_lock);
 178         }
 179         spin_unlock(&tpg->tpg_lun_lock);
 180 }
 181
 182 /*      core_set_queue_depth_for_node():
 183  *
 184  *
 185  */
 186 static int core_set_queue_depth_for_node(
 187         struct se_portal_group *tpg,
 188         struct se_node_acl *acl)
 189 {
 190         if (!acl->queue_depth) {
 191                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
 192                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
 193                         acl->initiatorname);
 194                 acl->queue_depth = 1;
 195         }
 196
 197         return 0;
 198 }
 199
 200 /*      core_create_device_list_for_node():
 201  *
 202  *
 203  */
 204 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 205 {
 206         struct se_dev_entry *deve;
 207         int i;
 208
 209         nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
 210                                 TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
 211         if (!nacl->device_list) {
 212                 pr_err("Unable to allocate memory for"
 213                         " struct se_node_acl->device_list\n");
 214                 return -ENOMEM;
 215         }
 216         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 217                 deve = &nacl->device_list[i];
 218
 219                 atomic_set(&deve->ua_count, 0);
 220                 atomic_set(&deve->pr_ref_count, 0);
 221                 spin_lock_init(&deve->ua_lock);
 222                 INIT_LIST_HEAD(&deve->alua_port_list);
 223                 INIT_LIST_HEAD(&deve->ua_list);
 224         }
 225
 226         return 0;
 227 }
 228
 229 /*      core_tpg_check_initiator_node_acl()
 230  *
 231  *
 232  */
 233 struct se_node_acl *core_tpg_check_initiator_node_acl(
 234         struct se_portal_group *tpg,
 235         unsigned char *initiatorname)
 236 {
 237         struct se_node_acl *acl;
 238
 239         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 240         if (acl)
 241                 return acl;
 242
 243         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 244                 return NULL;
 245
 246         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
 247         if (!acl)
 248                 return NULL;
 249
 250         INIT_LIST_HEAD(&acl->acl_list);
 251         INIT_LIST_HEAD(&acl->acl_sess_list);
 252         spin_lock_init(&acl->device_list_lock);
 253         spin_lock_init(&acl->nacl_sess_lock);
 254         atomic_set(&acl->acl_pr_ref_count, 0);
 255         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 256         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 257         acl->se_tpg = tpg;
 258         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 259         spin_lock_init(&acl->stats_lock);
 260         acl->dynamic_node_acl = 1;
 261
 262         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 263
 264         if (core_create_device_list_for_node(acl) < 0) {
 265                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 266                 return NULL;
 267         }
 268
 269         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 270                 core_free_device_list_for_node(acl, tpg);
 271                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 272                 return NULL;
 273         }
 274         /*
 275          * Here we only create demo-mode MappedLUNs from the active
 276          * TPG LUNs if the fabric is not explictly asking for
 277          * tpg_check_demo_mode_login_only() == 1.
 278          */
 279         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only != NULL) &&
 280             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) == 1))
 281                 do { ; } while (0);
 282         else
 283                 core_tpg_add_node_to_devs(acl, tpg);
 284
 285         spin_lock_irq(&tpg->acl_node_lock);
 286         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 287         tpg->num_node_acls++;
 288         spin_unlock_irq(&tpg->acl_node_lock);
 289
 290         pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 291                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 292                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 293                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 294
 295         return acl;
 296 }
 297 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 298
 299 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 300 {
 301         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 302                 cpu_relax();
 303 }
 304
 305 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 306 {
 307         int i, ret;
 308         struct se_lun *lun;
 309
 310         spin_lock(&tpg->tpg_lun_lock);
 311         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 312                 lun = &tpg->tpg_lun_list[i];
 313
 314                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 315                     (lun->lun_se_dev == NULL))
 316                         continue;
 317
 318                 spin_unlock(&tpg->tpg_lun_lock);
 319                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
 320                 spin_lock(&tpg->tpg_lun_lock);
 321         }
 322         spin_unlock(&tpg->tpg_lun_lock);
 323 }
 324 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 325
 326 /*      core_tpg_add_initiator_node_acl():
 327  *
 328  *
 329  */
 330 struct se_node_acl *core_tpg_add_initiator_node_acl(
 331         struct se_portal_group *tpg,
 332         struct se_node_acl *se_nacl,
 333         const char *initiatorname,
 334         u32 queue_depth)
 335 {
 336         struct se_node_acl *acl = NULL;
 337
 338         spin_lock_irq(&tpg->acl_node_lock);
 339         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 340         if (acl) {
 341                 if (acl->dynamic_node_acl) {
 342                         acl->dynamic_node_acl = 0;
 343                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 344                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 345                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 346                         spin_unlock_irq(&tpg->acl_node_lock);
 347                         /*
 348                          * Release the locally allocated struct se_node_acl
 349                          * because * core_tpg_add_initiator_node_acl() returned
 350                          * a pointer to an existing demo mode node ACL.
 351                          */
 352                         if (se_nacl)
 353                                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
 354                                                         se_nacl);
 355                         goto done;
 356                 }
 357
 358                 pr_err("ACL entry for %s Initiator"
 359                         " Node %s already exists for TPG %u, ignoring"
 360                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 361                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 362                 spin_unlock_irq(&tpg->acl_node_lock);
 363                 return ERR_PTR(-EEXIST);
 364         }
 365         spin_unlock_irq(&tpg->acl_node_lock);
 366
 367         if (!se_nacl) {
 368                 pr_err("struct se_node_acl pointer is NULL\n");
 369                 return ERR_PTR(-EINVAL);
 370         }
 371         /*
 372          * For v4.x logic the se_node_acl_s is hanging off a fabric
 373          * dependent structure allocated via
 374          * struct target_core_fabric_ops->fabric_make_nodeacl()
 375          */
 376         acl = se_nacl;
 377
 378         INIT_LIST_HEAD(&acl->acl_list);
 379         INIT_LIST_HEAD(&acl->acl_sess_list);
 380         spin_lock_init(&acl->device_list_lock);
 381         spin_lock_init(&acl->nacl_sess_lock);
 382         atomic_set(&acl->acl_pr_ref_count, 0);
 383         acl->queue_depth = queue_depth;
 384         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 385         acl->se_tpg = tpg;
 386         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 387         spin_lock_init(&acl->stats_lock);
 388
 389         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 390
 391         if (core_create_device_list_for_node(acl) < 0) {
 392                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 393                 return ERR_PTR(-ENOMEM);
 394         }
 395
 396         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 397                 core_free_device_list_for_node(acl, tpg);
 398                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
 399                 return ERR_PTR(-EINVAL);
 400         }
 401
 402         spin_lock_irq(&tpg->acl_node_lock);
 403         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 404         tpg->num_node_acls++;
 405         spin_unlock_irq(&tpg->acl_node_lock);
 406
 407 done:
 408         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 409                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 410                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 411                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 412
 413         return acl;
 414 }
 415 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 416
 417 /*      core_tpg_del_initiator_node_acl():
 418  *
 419  *
 420  */
 421 int core_tpg_del_initiator_node_acl(
 422         struct se_portal_group *tpg,
 423         struct se_node_acl *acl,
 424         int force)
 425 {
 426         struct se_session *sess, *sess_tmp;
 427         int dynamic_acl = 0;
 428
 429         spin_lock_irq(&tpg->acl_node_lock);
 430         if (acl->dynamic_node_acl) {
 431                 acl->dynamic_node_acl = 0;
 432                 dynamic_acl = 1;
 433         }
 434         list_del(&acl->acl_list);
 435         tpg->num_node_acls--;
 436         spin_unlock_irq(&tpg->acl_node_lock);
 437
 438         spin_lock_bh(&tpg->session_lock);
 439         list_for_each_entry_safe(sess, sess_tmp,
 440                                 &tpg->tpg_sess_list, sess_list) {
 441                 if (sess->se_node_acl != acl)
 442                         continue;
 443                 /*
 444                  * Determine if the session needs to be closed by our context.
 445                  */
 446                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 447                         continue;
 448
 449                 spin_unlock_bh(&tpg->session_lock);
 450                 /*
 451                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 452                  * forcefully shutdown the $FABRIC_MOD session/nexus.
 453                  */
 454                 tpg->se_tpg_tfo->close_session(sess);
 455
 456                 spin_lock_bh(&tpg->session_lock);
 457         }
 458         spin_unlock_bh(&tpg->session_lock);
 459
 460         core_tpg_wait_for_nacl_pr_ref(acl);
 461         core_clear_initiator_node_from_tpg(acl, tpg);
 462         core_free_device_list_for_node(acl, tpg);
 463
 464         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 465                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 466                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 467                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 468
 469         return 0;
 470 }
 471 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 472
 473 /*      core_tpg_set_initiator_node_queue_depth():
 474  *
 475  *
 476  */
 477 int core_tpg_set_initiator_node_queue_depth(
 478         struct se_portal_group *tpg,
 479         unsigned char *initiatorname,
 480         u32 queue_depth,
 481         int force)
 482 {
 483         struct se_session *sess, *init_sess = NULL;
 484         struct se_node_acl *acl;
 485         int dynamic_acl = 0;
 486
 487         spin_lock_irq(&tpg->acl_node_lock);
 488         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 489         if (!acl) {
 490                 pr_err("Access Control List entry for %s Initiator"
 491                         " Node %s does not exists for TPG %hu, ignoring"
 492                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 493                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 494                 spin_unlock_irq(&tpg->acl_node_lock);
 495                 return -ENODEV;
 496         }
 497         if (acl->dynamic_node_acl) {
 498                 acl->dynamic_node_acl = 0;
 499                 dynamic_acl = 1;
 500         }
 501         spin_unlock_irq(&tpg->acl_node_lock);
 502
 503         spin_lock_bh(&tpg->session_lock);
 504         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 505                 if (sess->se_node_acl != acl)
 506                         continue;
 507
 508                 if (!force) {
 509                         pr_err("Unable to change queue depth for %s"
 510                                 " Initiator Node: %s while session is"
 511                                 " operational.  To forcefully change the queue"
 512                                 " depth and force session reinstatement"
 513                                 " use the \"force=1\" parameter.\n",
 514                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 515                         spin_unlock_bh(&tpg->session_lock);
 516
 517                         spin_lock_irq(&tpg->acl_node_lock);
 518                         if (dynamic_acl)
 519                                 acl->dynamic_node_acl = 1;
 520                         spin_unlock_irq(&tpg->acl_node_lock);
 521                         return -EEXIST;
 522                 }
 523                 /*
 524                  * Determine if the session needs to be closed by our context.
 525                  */
 526                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 527                         continue;
 528
 529                 init_sess = sess;
 530                 break;
 531         }
 532
 533         /*
 534          * User has requested to change the queue depth for a Initiator Node.
 535          * Change the value in the Node's struct se_node_acl, and call
 536          * core_set_queue_depth_for_node() to add the requested queue depth.
 537          *
 538          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 539          * reinstatement to occur if there is an active session for the
 540          * $FABRIC_MOD Initiator Node in question.
 541          */
 542         acl->queue_depth = queue_depth;
 543
 544         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 545                 spin_unlock_bh(&tpg->session_lock);
 546                 /*
 547                  * Force session reinstatement if
 548                  * core_set_queue_depth_for_node() failed, because we assume
 549                  * the $FABRIC_MOD has already the set session reinstatement
 550                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 551                  */
 552                 if (init_sess)
 553                         tpg->se_tpg_tfo->close_session(init_sess);
 554
 555                 spin_lock_irq(&tpg->acl_node_lock);
 556                 if (dynamic_acl)
 557                         acl->dynamic_node_acl = 1;
 558                 spin_unlock_irq(&tpg->acl_node_lock);
 559                 return -EINVAL;
 560         }
 561         spin_unlock_bh(&tpg->session_lock);
 562         /*
 563          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 564          * forcefully shutdown the $FABRIC_MOD session/nexus.
 565          */
 566         if (init_sess)
 567                 tpg->se_tpg_tfo->close_session(init_sess);
 568
 569         pr_debug("Successfully changed queue depth to: %d for Initiator"
 570                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 571                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 572                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 573
 574         spin_lock_irq(&tpg->acl_node_lock);
 575         if (dynamic_acl)
 576                 acl->dynamic_node_acl = 1;
 577         spin_unlock_irq(&tpg->acl_node_lock);
 578
 579         return 0;
 580 }
 581 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 582
 583 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 584 {
 585         /* Set in core_dev_setup_virtual_lun0() */
 586         struct se_device *dev = g_lun0_dev;
 587         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 588         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 589         int ret;
 590
 591         lun->unpacked_lun = 0;
 592         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 593         atomic_set(&lun->lun_acl_count, 0);
 594         init_completion(&lun->lun_shutdown_comp);
 595         INIT_LIST_HEAD(&lun->lun_acl_list);
 596         INIT_LIST_HEAD(&lun->lun_cmd_list);
 597         spin_lock_init(&lun->lun_acl_lock);
 598         spin_lock_init(&lun->lun_cmd_lock);
 599         spin_lock_init(&lun->lun_sep_lock);
 600
 601         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 602         if (ret < 0)
 603                 return ret;
 604
 605         return 0;
 606 }
 607
 608 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 609 {
 610         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 611
 612         core_tpg_post_dellun(se_tpg, lun);
 613 }
 614
 615 int core_tpg_register(
 616         struct target_core_fabric_ops *tfo,
 617         struct se_wwn *se_wwn,
 618         struct se_portal_group *se_tpg,
 619         void *tpg_fabric_ptr,
 620         int se_tpg_type)
 621 {
 622         struct se_lun *lun;
 623         u32 i;
 624
 625         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 626                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 627         if (!se_tpg->tpg_lun_list) {
 628                 pr_err("Unable to allocate struct se_portal_group->"
 629                                 "tpg_lun_list\n");
 630                 return -ENOMEM;
 631         }
 632
 633         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 634                 lun = &se_tpg->tpg_lun_list[i];
 635                 lun->unpacked_lun = i;
 636                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 637                 atomic_set(&lun->lun_acl_count, 0);
 638                 init_completion(&lun->lun_shutdown_comp);
 639                 INIT_LIST_HEAD(&lun->lun_acl_list);
 640                 INIT_LIST_HEAD(&lun->lun_cmd_list);
 641                 spin_lock_init(&lun->lun_acl_lock);
 642                 spin_lock_init(&lun->lun_cmd_lock);
 643                 spin_lock_init(&lun->lun_sep_lock);
 644         }
 645
 646         se_tpg->se_tpg_type = se_tpg_type;
 647         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 648         se_tpg->se_tpg_tfo = tfo;
 649         se_tpg->se_tpg_wwn = se_wwn;
 650         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 651         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 652         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 653         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 654         spin_lock_init(&se_tpg->acl_node_lock);
 655         spin_lock_init(&se_tpg->session_lock);
 656         spin_lock_init(&se_tpg->tpg_lun_lock);
 657
 658         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 659                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 660                         kfree(se_tpg);
 661                         return -ENOMEM;
 662                 }
 663         }
 664
 665         spin_lock_bh(&tpg_lock);
 666         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 667         spin_unlock_bh(&tpg_lock);
 668
 669         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 670                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 671                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 672                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 673                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 674
 675         return 0;
 676 }
 677 EXPORT_SYMBOL(core_tpg_register);
 678
 679 int core_tpg_deregister(struct se_portal_group *se_tpg)
 680 {
 681         struct se_node_acl *nacl, *nacl_tmp;
 682
 683         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 684                 " for endpoint: %s Portal Tag %u\n",
 685                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 686                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 687                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 688                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 689
 690         spin_lock_bh(&tpg_lock);
 691         list_del(&se_tpg->se_tpg_node);
 692         spin_unlock_bh(&tpg_lock);
 693
 694         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 695                 cpu_relax();
 696         /*
 697          * Release any remaining demo-mode generated se_node_acl that have
 698          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 699          * in transport_deregister_session().
 700          */
 701         spin_lock_irq(&se_tpg->acl_node_lock);
 702         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 703                         acl_list) {
 704                 list_del(&nacl->acl_list);
 705                 se_tpg->num_node_acls--;
 706                 spin_unlock_irq(&se_tpg->acl_node_lock);
 707
 708                 core_tpg_wait_for_nacl_pr_ref(nacl);
 709                 core_free_device_list_for_node(nacl, se_tpg);
 710                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
 711
 712                 spin_lock_irq(&se_tpg->acl_node_lock);
 713         }
 714         spin_unlock_irq(&se_tpg->acl_node_lock);
 715
 716         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 717                 core_tpg_release_virtual_lun0(se_tpg);
 718
 719         se_tpg->se_tpg_fabric_ptr = NULL;
 720         kfree(se_tpg->tpg_lun_list);
 721         return 0;
 722 }
 723 EXPORT_SYMBOL(core_tpg_deregister);
 724
 725 struct se_lun *core_tpg_pre_addlun(
 726         struct se_portal_group *tpg,
 727         u32 unpacked_lun)
 728 {
 729         struct se_lun *lun;
 730
 731         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 732                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 733                         "-1: %u for Target Portal Group: %u\n",
 734                         tpg->se_tpg_tfo->get_fabric_name(),
 735                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 736                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 737                 return ERR_PTR(-EOVERFLOW);
 738         }
 739
 740         spin_lock(&tpg->tpg_lun_lock);
 741         lun = &tpg->tpg_lun_list[unpacked_lun];
 742         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 743                 pr_err("TPG Logical Unit Number: %u is already active"
 744                         " on %s Target Portal Group: %u, ignoring request.\n",
 745                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 746                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 747                 spin_unlock(&tpg->tpg_lun_lock);
 748                 return ERR_PTR(-EINVAL);
 749         }
 750         spin_unlock(&tpg->tpg_lun_lock);
 751
 752         return lun;
 753 }
 754
 755 int core_tpg_post_addlun(
 756         struct se_portal_group *tpg,
 757         struct se_lun *lun,
 758         u32 lun_access,
 759         void *lun_ptr)
 760 {
 761         int ret;
 762
 763         ret = core_dev_export(lun_ptr, tpg, lun);
 764         if (ret < 0)
 765                 return ret;
 766
 767         spin_lock(&tpg->tpg_lun_lock);
 768         lun->lun_access = lun_access;
 769         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 770         spin_unlock(&tpg->tpg_lun_lock);
 771
 772         return 0;
 773 }
 774
 775 static void core_tpg_shutdown_lun(
 776         struct se_portal_group *tpg,
 777         struct se_lun *lun)
 778 {
 779         core_clear_lun_from_tpg(lun, tpg);
 780         transport_clear_lun_from_sessions(lun);
 781 }
 782
 783 struct se_lun *core_tpg_pre_dellun(
 784         struct se_portal_group *tpg,
 785         u32 unpacked_lun,
 786         int *ret)
 787 {
 788         struct se_lun *lun;
 789
 790         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 791                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 792                         "-1: %u for Target Portal Group: %u\n",
 793                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 794                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 795                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 796                 return ERR_PTR(-EOVERFLOW);
 797         }
 798
 799         spin_lock(&tpg->tpg_lun_lock);
 800         lun = &tpg->tpg_lun_list[unpacked_lun];
 801         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 802                 pr_err("%s Logical Unit Number: %u is not active on"
 803                         " Target Portal Group: %u, ignoring request.\n",
 804                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
 805                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 806                 spin_unlock(&tpg->tpg_lun_lock);
 807                 return ERR_PTR(-ENODEV);
 808         }
 809         spin_unlock(&tpg->tpg_lun_lock);
 810
 811         return lun;
 812 }
 813
 814 int core_tpg_post_dellun(
 815         struct se_portal_group *tpg,
 816         struct se_lun *lun)
 817 {
 818         core_tpg_shutdown_lun(tpg, lun);
 819
 820         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 821
 822         spin_lock(&tpg->tpg_lun_lock);
 823         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 824         spin_unlock(&tpg->tpg_lun_lock);
 825
 826         return 0;
 827 }