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  * (c) Copyright 2002-2013 Datera, Inc.
   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 #include "target_core_pr.h"
  44
  45 extern struct se_device *g_lun0_dev;
  46
  47 static DEFINE_SPINLOCK(tpg_lock);
  48 static LIST_HEAD(tpg_list);
  49
  50 /*      core_clear_initiator_node_from_tpg():
  51  *
  52  *
  53  */
  54 static void core_clear_initiator_node_from_tpg(
  55         struct se_node_acl *nacl,
  56         struct se_portal_group *tpg)
  57 {
  58         int i;
  59         struct se_dev_entry *deve;
  60         struct se_lun *lun;
  61
  62         spin_lock_irq(&nacl->device_list_lock);
  63         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
  64                 deve = nacl->device_list[i];
  65
  66                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
  67                         continue;
  68
  69                 if (!deve->se_lun) {
  70                         pr_err("%s device entries device pointer is"
  71                                 " NULL, but Initiator has access.\n",
  72                                 tpg->se_tpg_tfo->get_fabric_name());
  73                         continue;
  74                 }
  75
  76                 lun = deve->se_lun;
  77                 spin_unlock_irq(&nacl->device_list_lock);
  78                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
  79                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
  80
  81                 spin_lock_irq(&nacl->device_list_lock);
  82         }
  83         spin_unlock_irq(&nacl->device_list_lock);
  84 }
  85
  86 /*      __core_tpg_get_initiator_node_acl():
  87  *
  88  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
  89  */
  90 struct se_node_acl *__core_tpg_get_initiator_node_acl(
  91         struct se_portal_group *tpg,
  92         const char *initiatorname)
  93 {
  94         struct se_node_acl *acl;
  95
  96         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
  97                 if (!strcmp(acl->initiatorname, initiatorname))
  98                         return acl;
  99         }
 100
 101         return NULL;
 102 }
 103
 104 /*      core_tpg_get_initiator_node_acl():
 105  *
 106  *
 107  */
 108 struct se_node_acl *core_tpg_get_initiator_node_acl(
 109         struct se_portal_group *tpg,
 110         unsigned char *initiatorname)
 111 {
 112         struct se_node_acl *acl;
 113
 114         spin_lock_irq(&tpg->acl_node_lock);
 115         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 116         spin_unlock_irq(&tpg->acl_node_lock);
 117
 118         return acl;
 119 }
 120 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
 121
 122 /*      core_tpg_add_node_to_devs():
 123  *
 124  *
 125  */
 126 void core_tpg_add_node_to_devs(
 127         struct se_node_acl *acl,
 128         struct se_portal_group *tpg)
 129 {
 130         int i = 0;
 131         u32 lun_access = 0;
 132         struct se_lun *lun;
 133         struct se_device *dev;
 134
 135         spin_lock(&tpg->tpg_lun_lock);
 136         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 137                 lun = tpg->tpg_lun_list[i];
 138                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 139                         continue;
 140
 141                 spin_unlock(&tpg->tpg_lun_lock);
 142
 143                 dev = lun->lun_se_dev;
 144                 /*
 145                  * By default in LIO-Target $FABRIC_MOD,
 146                  * demo_mode_write_protect is ON, or READ_ONLY;
 147                  */
 148                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
 149                         lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 150                 } else {
 151                         /*
 152                          * Allow only optical drives to issue R/W in default RO
 153                          * demo mode.
 154                          */
 155                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
 156                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 157                         else
 158                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 159                 }
 160
 161                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 162                         " access for LUN in Demo Mode\n",
 163                         tpg->se_tpg_tfo->get_fabric_name(),
 164                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
 165                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 166                         "READ-WRITE" : "READ-ONLY");
 167
 168                 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
 169                                 lun_access, acl, tpg);
 170                 /*
 171                  * Check to see if there are any existing persistent reservation
 172                  * APTPL pre-registrations that need to be enabled for this dynamic
 173                  * LUN ACL now..
 174                  */
 175                 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
 176                                                     lun->unpacked_lun);
 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 void array_free(void *array, int n)
 201 {
 202         void **a = array;
 203         int i;
 204
 205         for (i = 0; i < n; i++)
 206                 kfree(a[i]);
 207         kfree(a);
 208 }
 209
 210 static void *array_zalloc(int n, size_t size, gfp_t flags)
 211 {
 212         void **a;
 213         int i;
 214
 215         a = kzalloc(n * sizeof(void*), flags);
 216         if (!a)
 217                 return NULL;
 218         for (i = 0; i < n; i++) {
 219                 a[i] = kzalloc(size, flags);
 220                 if (!a[i]) {
 221                         array_free(a, n);
 222                         return NULL;
 223                 }
 224         }
 225         return a;
 226 }
 227
 228 /*      core_create_device_list_for_node():
 229  *
 230  *
 231  */
 232 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 233 {
 234         struct se_dev_entry *deve;
 235         int i;
 236
 237         nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 238                         sizeof(struct se_dev_entry), GFP_KERNEL);
 239         if (!nacl->device_list) {
 240                 pr_err("Unable to allocate memory for"
 241                         " struct se_node_acl->device_list\n");
 242                 return -ENOMEM;
 243         }
 244         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 245                 deve = nacl->device_list[i];
 246
 247                 atomic_set(&deve->ua_count, 0);
 248                 atomic_set(&deve->pr_ref_count, 0);
 249                 spin_lock_init(&deve->ua_lock);
 250                 INIT_LIST_HEAD(&deve->alua_port_list);
 251                 INIT_LIST_HEAD(&deve->ua_list);
 252         }
 253
 254         return 0;
 255 }
 256
 257 static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg,
 258                 const unsigned char *initiatorname)
 259 {
 260         struct se_node_acl *acl;
 261
 262         acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size),
 263                         GFP_KERNEL);
 264         if (!acl)
 265                 return NULL;
 266
 267         INIT_LIST_HEAD(&acl->acl_list);
 268         INIT_LIST_HEAD(&acl->acl_sess_list);
 269         kref_init(&acl->acl_kref);
 270         init_completion(&acl->acl_free_comp);
 271         spin_lock_init(&acl->device_list_lock);
 272         spin_lock_init(&acl->nacl_sess_lock);
 273         atomic_set(&acl->acl_pr_ref_count, 0);
 274         if (tpg->se_tpg_tfo->tpg_get_default_depth)
 275                 acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
 276         else
 277                 acl->queue_depth = 1;
 278         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 279         acl->se_tpg = tpg;
 280         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 281
 282         tpg->se_tpg_tfo->set_default_node_attributes(acl);
 283
 284         if (core_create_device_list_for_node(acl) < 0)
 285                 goto out_free_acl;
 286         if (core_set_queue_depth_for_node(tpg, acl) < 0)
 287                 goto out_free_device_list;
 288
 289         return acl;
 290
 291 out_free_device_list:
 292         core_free_device_list_for_node(acl, tpg);
 293 out_free_acl:
 294         kfree(acl);
 295         return NULL;
 296 }
 297
 298 static void target_add_node_acl(struct se_node_acl *acl)
 299 {
 300         struct se_portal_group *tpg = acl->se_tpg;
 301
 302         spin_lock_irq(&tpg->acl_node_lock);
 303         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 304         tpg->num_node_acls++;
 305         spin_unlock_irq(&tpg->acl_node_lock);
 306
 307         pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s"
 308                 " Initiator Node: %s\n",
 309                 tpg->se_tpg_tfo->get_fabric_name(),
 310                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
 311                 acl->dynamic_node_acl ? "DYNAMIC" : "",
 312                 acl->queue_depth,
 313                 tpg->se_tpg_tfo->get_fabric_name(),
 314                 acl->initiatorname);
 315 }
 316
 317 struct se_node_acl *core_tpg_check_initiator_node_acl(
 318         struct se_portal_group *tpg,
 319         unsigned char *initiatorname)
 320 {
 321         struct se_node_acl *acl;
 322
 323         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 324         if (acl)
 325                 return acl;
 326
 327         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
 328                 return NULL;
 329
 330         acl = target_alloc_node_acl(tpg, initiatorname);
 331         if (!acl)
 332                 return NULL;
 333         acl->dynamic_node_acl = 1;
 334
 335         /*
 336          * Here we only create demo-mode MappedLUNs from the active
 337          * TPG LUNs if the fabric is not explicitly asking for
 338          * tpg_check_demo_mode_login_only() == 1.
 339          */
 340         if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
 341             (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
 342                 core_tpg_add_node_to_devs(acl, tpg);
 343
 344         target_add_node_acl(acl);
 345         return acl;
 346 }
 347 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 348
 349 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 350 {
 351         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 352                 cpu_relax();
 353 }
 354
 355 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 356 {
 357         int i;
 358         struct se_lun *lun;
 359
 360         spin_lock(&tpg->tpg_lun_lock);
 361         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 362                 lun = tpg->tpg_lun_list[i];
 363
 364                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 365                     (lun->lun_se_dev == NULL))
 366                         continue;
 367
 368                 spin_unlock(&tpg->tpg_lun_lock);
 369                 core_dev_del_lun(tpg, lun);
 370                 spin_lock(&tpg->tpg_lun_lock);
 371         }
 372         spin_unlock(&tpg->tpg_lun_lock);
 373 }
 374 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 375
 376 struct se_node_acl *core_tpg_add_initiator_node_acl(
 377         struct se_portal_group *tpg,
 378         const char *initiatorname)
 379 {
 380         struct se_node_acl *acl;
 381
 382         spin_lock_irq(&tpg->acl_node_lock);
 383         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 384         if (acl) {
 385                 if (acl->dynamic_node_acl) {
 386                         acl->dynamic_node_acl = 0;
 387                         pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
 388                                 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 389                                 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
 390                         spin_unlock_irq(&tpg->acl_node_lock);
 391                         return acl;
 392                 }
 393
 394                 pr_err("ACL entry for %s Initiator"
 395                         " Node %s already exists for TPG %u, ignoring"
 396                         " request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
 397                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 398                 spin_unlock_irq(&tpg->acl_node_lock);
 399                 return ERR_PTR(-EEXIST);
 400         }
 401         spin_unlock_irq(&tpg->acl_node_lock);
 402
 403         acl = target_alloc_node_acl(tpg, initiatorname);
 404         if (!acl)
 405                 return ERR_PTR(-ENOMEM);
 406
 407         target_add_node_acl(acl);
 408         return acl;
 409 }
 410
 411 void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
 412 {
 413         struct se_portal_group *tpg = acl->se_tpg;
 414         LIST_HEAD(sess_list);
 415         struct se_session *sess, *sess_tmp;
 416         unsigned long flags;
 417         int rc;
 418
 419         spin_lock_irq(&tpg->acl_node_lock);
 420         if (acl->dynamic_node_acl) {
 421                 acl->dynamic_node_acl = 0;
 422         }
 423         list_del(&acl->acl_list);
 424         tpg->num_node_acls--;
 425         spin_unlock_irq(&tpg->acl_node_lock);
 426
 427         spin_lock_irqsave(&acl->nacl_sess_lock, flags);
 428         acl->acl_stop = 1;
 429
 430         list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
 431                                 sess_acl_list) {
 432                 if (sess->sess_tearing_down != 0)
 433                         continue;
 434
 435                 target_get_session(sess);
 436                 list_move(&sess->sess_acl_list, &sess_list);
 437         }
 438         spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
 439
 440         list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
 441                 list_del(&sess->sess_acl_list);
 442
 443                 rc = tpg->se_tpg_tfo->shutdown_session(sess);
 444                 target_put_session(sess);
 445                 if (!rc)
 446                         continue;
 447                 target_put_session(sess);
 448         }
 449         target_put_nacl(acl);
 450         /*
 451          * Wait for last target_put_nacl() to complete in target_complete_nacl()
 452          * for active fabric session transport_deregister_session() callbacks.
 453          */
 454         wait_for_completion(&acl->acl_free_comp);
 455
 456         core_tpg_wait_for_nacl_pr_ref(acl);
 457         core_clear_initiator_node_from_tpg(acl, tpg);
 458         core_free_device_list_for_node(acl, tpg);
 459
 460         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 461                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
 462                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
 463                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
 464
 465         kfree(acl);
 466 }
 467
 468 /*      core_tpg_set_initiator_node_queue_depth():
 469  *
 470  *
 471  */
 472 int core_tpg_set_initiator_node_queue_depth(
 473         struct se_portal_group *tpg,
 474         unsigned char *initiatorname,
 475         u32 queue_depth,
 476         int force)
 477 {
 478         struct se_session *sess, *init_sess = NULL;
 479         struct se_node_acl *acl;
 480         unsigned long flags;
 481         int dynamic_acl = 0;
 482
 483         spin_lock_irq(&tpg->acl_node_lock);
 484         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 485         if (!acl) {
 486                 pr_err("Access Control List entry for %s Initiator"
 487                         " Node %s does not exists for TPG %hu, ignoring"
 488                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
 489                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
 490                 spin_unlock_irq(&tpg->acl_node_lock);
 491                 return -ENODEV;
 492         }
 493         if (acl->dynamic_node_acl) {
 494                 acl->dynamic_node_acl = 0;
 495                 dynamic_acl = 1;
 496         }
 497         spin_unlock_irq(&tpg->acl_node_lock);
 498
 499         spin_lock_irqsave(&tpg->session_lock, flags);
 500         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 501                 if (sess->se_node_acl != acl)
 502                         continue;
 503
 504                 if (!force) {
 505                         pr_err("Unable to change queue depth for %s"
 506                                 " Initiator Node: %s while session is"
 507                                 " operational.  To forcefully change the queue"
 508                                 " depth and force session reinstatement"
 509                                 " use the \"force=1\" parameter.\n",
 510                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
 511                         spin_unlock_irqrestore(&tpg->session_lock, flags);
 512
 513                         spin_lock_irq(&tpg->acl_node_lock);
 514                         if (dynamic_acl)
 515                                 acl->dynamic_node_acl = 1;
 516                         spin_unlock_irq(&tpg->acl_node_lock);
 517                         return -EEXIST;
 518                 }
 519                 /*
 520                  * Determine if the session needs to be closed by our context.
 521                  */
 522                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
 523                         continue;
 524
 525                 init_sess = sess;
 526                 break;
 527         }
 528
 529         /*
 530          * User has requested to change the queue depth for a Initiator Node.
 531          * Change the value in the Node's struct se_node_acl, and call
 532          * core_set_queue_depth_for_node() to add the requested queue depth.
 533          *
 534          * Finally call  tpg->se_tpg_tfo->close_session() to force session
 535          * reinstatement to occur if there is an active session for the
 536          * $FABRIC_MOD Initiator Node in question.
 537          */
 538         acl->queue_depth = queue_depth;
 539
 540         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 541                 spin_unlock_irqrestore(&tpg->session_lock, flags);
 542                 /*
 543                  * Force session reinstatement if
 544                  * core_set_queue_depth_for_node() failed, because we assume
 545                  * the $FABRIC_MOD has already the set session reinstatement
 546                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
 547                  */
 548                 if (init_sess)
 549                         tpg->se_tpg_tfo->close_session(init_sess);
 550
 551                 spin_lock_irq(&tpg->acl_node_lock);
 552                 if (dynamic_acl)
 553                         acl->dynamic_node_acl = 1;
 554                 spin_unlock_irq(&tpg->acl_node_lock);
 555                 return -EINVAL;
 556         }
 557         spin_unlock_irqrestore(&tpg->session_lock, flags);
 558         /*
 559          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 560          * forcefully shutdown the $FABRIC_MOD session/nexus.
 561          */
 562         if (init_sess)
 563                 tpg->se_tpg_tfo->close_session(init_sess);
 564
 565         pr_debug("Successfully changed queue depth to: %d for Initiator"
 566                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 567                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
 568                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
 569
 570         spin_lock_irq(&tpg->acl_node_lock);
 571         if (dynamic_acl)
 572                 acl->dynamic_node_acl = 1;
 573         spin_unlock_irq(&tpg->acl_node_lock);
 574
 575         return 0;
 576 }
 577 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 578
 579 /*      core_tpg_set_initiator_node_tag():
 580  *
 581  *      Initiator nodeacl tags are not used internally, but may be used by
 582  *      userspace to emulate aliases or groups.
 583  *      Returns length of newly-set tag or -EINVAL.
 584  */
 585 int core_tpg_set_initiator_node_tag(
 586         struct se_portal_group *tpg,
 587         struct se_node_acl *acl,
 588         const char *new_tag)
 589 {
 590         if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
 591                 return -EINVAL;
 592
 593         if (!strncmp("NULL", new_tag, 4)) {
 594                 acl->acl_tag[0] = '\0';
 595                 return 0;
 596         }
 597
 598         return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
 599 }
 600 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
 601
 602 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
 603 {
 604         struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
 605
 606         complete(&lun->lun_ref_comp);
 607 }
 608
 609 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 610 {
 611         /* Set in core_dev_setup_virtual_lun0() */
 612         struct se_device *dev = g_lun0_dev;
 613         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 614         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 615         int ret;
 616
 617         lun->unpacked_lun = 0;
 618         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 619         atomic_set(&lun->lun_acl_count, 0);
 620         init_completion(&lun->lun_shutdown_comp);
 621         INIT_LIST_HEAD(&lun->lun_acl_list);
 622         spin_lock_init(&lun->lun_acl_lock);
 623         spin_lock_init(&lun->lun_sep_lock);
 624         init_completion(&lun->lun_ref_comp);
 625
 626         ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
 627         if (ret < 0)
 628                 return ret;
 629
 630         return 0;
 631 }
 632
 633 int core_tpg_register(
 634         const struct target_core_fabric_ops *tfo,
 635         struct se_wwn *se_wwn,
 636         struct se_portal_group *se_tpg,
 637         void *tpg_fabric_ptr,
 638         int se_tpg_type)
 639 {
 640         struct se_lun *lun;
 641         u32 i;
 642
 643         se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
 644                         sizeof(struct se_lun), GFP_KERNEL);
 645         if (!se_tpg->tpg_lun_list) {
 646                 pr_err("Unable to allocate struct se_portal_group->"
 647                                 "tpg_lun_list\n");
 648                 return -ENOMEM;
 649         }
 650
 651         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 652                 lun = se_tpg->tpg_lun_list[i];
 653                 lun->unpacked_lun = i;
 654                 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
 655                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 656                 atomic_set(&lun->lun_acl_count, 0);
 657                 init_completion(&lun->lun_shutdown_comp);
 658                 INIT_LIST_HEAD(&lun->lun_acl_list);
 659                 spin_lock_init(&lun->lun_acl_lock);
 660                 spin_lock_init(&lun->lun_sep_lock);
 661                 init_completion(&lun->lun_ref_comp);
 662         }
 663
 664         se_tpg->se_tpg_type = se_tpg_type;
 665         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 666         se_tpg->se_tpg_tfo = tfo;
 667         se_tpg->se_tpg_wwn = se_wwn;
 668         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 669         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 670         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
 671         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 672         spin_lock_init(&se_tpg->acl_node_lock);
 673         spin_lock_init(&se_tpg->session_lock);
 674         spin_lock_init(&se_tpg->tpg_lun_lock);
 675
 676         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 677                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 678                         array_free(se_tpg->tpg_lun_list,
 679                                    TRANSPORT_MAX_LUNS_PER_TPG);
 680                         return -ENOMEM;
 681                 }
 682         }
 683
 684         spin_lock_bh(&tpg_lock);
 685         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
 686         spin_unlock_bh(&tpg_lock);
 687
 688         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 689                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 690                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 691                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 692                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 693
 694         return 0;
 695 }
 696 EXPORT_SYMBOL(core_tpg_register);
 697
 698 int core_tpg_deregister(struct se_portal_group *se_tpg)
 699 {
 700         struct se_node_acl *nacl, *nacl_tmp;
 701
 702         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 703                 " for endpoint: %s Portal Tag %u\n",
 704                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 705                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
 706                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
 707                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
 708
 709         spin_lock_bh(&tpg_lock);
 710         list_del(&se_tpg->se_tpg_node);
 711         spin_unlock_bh(&tpg_lock);
 712
 713         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 714                 cpu_relax();
 715         /*
 716          * Release any remaining demo-mode generated se_node_acl that have
 717          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 718          * in transport_deregister_session().
 719          */
 720         spin_lock_irq(&se_tpg->acl_node_lock);
 721         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 722                         acl_list) {
 723                 list_del(&nacl->acl_list);
 724                 se_tpg->num_node_acls--;
 725                 spin_unlock_irq(&se_tpg->acl_node_lock);
 726
 727                 core_tpg_wait_for_nacl_pr_ref(nacl);
 728                 core_free_device_list_for_node(nacl, se_tpg);
 729                 kfree(nacl);
 730
 731                 spin_lock_irq(&se_tpg->acl_node_lock);
 732         }
 733         spin_unlock_irq(&se_tpg->acl_node_lock);
 734
 735         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 736                 core_tpg_remove_lun(se_tpg, &se_tpg->tpg_virt_lun0);
 737
 738         se_tpg->se_tpg_fabric_ptr = NULL;
 739         array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
 740         return 0;
 741 }
 742 EXPORT_SYMBOL(core_tpg_deregister);
 743
 744 struct se_lun *core_tpg_alloc_lun(
 745         struct se_portal_group *tpg,
 746         u32 unpacked_lun)
 747 {
 748         struct se_lun *lun;
 749
 750         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 751                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 752                         "-1: %u for Target Portal Group: %u\n",
 753                         tpg->se_tpg_tfo->get_fabric_name(),
 754                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 755                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 756                 return ERR_PTR(-EOVERFLOW);
 757         }
 758
 759         spin_lock(&tpg->tpg_lun_lock);
 760         lun = tpg->tpg_lun_list[unpacked_lun];
 761         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 762                 pr_err("TPG Logical Unit Number: %u is already active"
 763                         " on %s Target Portal Group: %u, ignoring request.\n",
 764                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
 765                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
 766                 spin_unlock(&tpg->tpg_lun_lock);
 767                 return ERR_PTR(-EINVAL);
 768         }
 769         spin_unlock(&tpg->tpg_lun_lock);
 770
 771         return lun;
 772 }
 773
 774 int core_tpg_add_lun(
 775         struct se_portal_group *tpg,
 776         struct se_lun *lun,
 777         u32 lun_access,
 778         struct se_device *dev)
 779 {
 780         int ret;
 781
 782         ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
 783                               GFP_KERNEL);
 784         if (ret < 0)
 785                 return ret;
 786
 787         ret = core_dev_export(dev, tpg, lun);
 788         if (ret < 0) {
 789                 percpu_ref_exit(&lun->lun_ref);
 790                 return ret;
 791         }
 792
 793         spin_lock(&tpg->tpg_lun_lock);
 794         lun->lun_access = lun_access;
 795         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 796         spin_unlock(&tpg->tpg_lun_lock);
 797
 798         return 0;
 799 }
 800
 801 void core_tpg_remove_lun(
 802         struct se_portal_group *tpg,
 803         struct se_lun *lun)
 804 {
 805         core_clear_lun_from_tpg(lun, tpg);
 806         transport_clear_lun_ref(lun);
 807
 808         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 809
 810         spin_lock(&tpg->tpg_lun_lock);
 811         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 812         spin_unlock(&tpg->tpg_lun_lock);
 813
 814         percpu_ref_exit(&lun->lun_ref);
 815 }