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/smp_lock.h>
  35 #include <linux/in.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
  49 /*      core_clear_initiator_node_from_tpg():
  50  *
  51  *
  52  */
  53 static 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         struct se_lun_acl *acl, *acl_tmp;
  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                         printk(KERN_ERR "%s device entries device pointer is"
  71                                 " NULL, but Initiator has access.\n",
  72                                 TPG_TFO(tpg)->get_fabric_name());
  73                         continue;
  74                 }
  75
  76                 lun = deve->se_lun;
  77                 spin_unlock_irq(&nacl->device_list_lock);
  78                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
  79                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
  80
  81                 spin_lock(&lun->lun_acl_lock);
  82                 list_for_each_entry_safe(acl, acl_tmp,
  83                                         &lun->lun_acl_list, lacl_list) {
  84                         if (!(strcmp(acl->initiatorname,
  85                                         nacl->initiatorname)) &&
  86                              (acl->mapped_lun == deve->mapped_lun))
  87                                 break;
  88                 }
  89
  90                 if (!acl) {
  91                         printk(KERN_ERR "Unable to locate struct se_lun_acl for %s,"
  92                                 " mapped_lun: %u\n", nacl->initiatorname,
  93                                 deve->mapped_lun);
  94                         spin_unlock(&lun->lun_acl_lock);
  95                         spin_lock_irq(&nacl->device_list_lock);
  96                         continue;
  97                 }
  98
  99                 list_del(&acl->lacl_list);
 100                 spin_unlock(&lun->lun_acl_lock);
 101
 102                 spin_lock_irq(&nacl->device_list_lock);
 103                 kfree(acl);
 104         }
 105         spin_unlock_irq(&nacl->device_list_lock);
 106 }
 107
 108 /*      __core_tpg_get_initiator_node_acl():
 109  *
 110  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
 111  */
 112 struct se_node_acl *__core_tpg_get_initiator_node_acl(
 113         struct se_portal_group *tpg,
 114         const char *initiatorname)
 115 {
 116         struct se_node_acl *acl;
 117
 118         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 119                 if (!(strcmp(acl->initiatorname, initiatorname)))
 120                         return acl;
 121         }
 122
 123         return NULL;
 124 }
 125
 126 /*      core_tpg_get_initiator_node_acl():
 127  *
 128  *
 129  */
 130 struct se_node_acl *core_tpg_get_initiator_node_acl(
 131         struct se_portal_group *tpg,
 132         unsigned char *initiatorname)
 133 {
 134         struct se_node_acl *acl;
 135
 136         spin_lock_bh(&tpg->acl_node_lock);
 137         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
 138                 if (!(strcmp(acl->initiatorname, initiatorname)) &&
 139                    (!(acl->dynamic_node_acl))) {
 140                         spin_unlock_bh(&tpg->acl_node_lock);
 141                         return acl;
 142                 }
 143         }
 144         spin_unlock_bh(&tpg->acl_node_lock);
 145
 146         return NULL;
 147 }
 148
 149 /*      core_tpg_add_node_to_devs():
 150  *
 151  *
 152  */
 153 void core_tpg_add_node_to_devs(
 154         struct se_node_acl *acl,
 155         struct se_portal_group *tpg)
 156 {
 157         int i = 0;
 158         u32 lun_access = 0;
 159         struct se_lun *lun;
 160         struct se_device *dev;
 161
 162         spin_lock(&tpg->tpg_lun_lock);
 163         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 164                 lun = &tpg->tpg_lun_list[i];
 165                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
 166                         continue;
 167
 168                 spin_unlock(&tpg->tpg_lun_lock);
 169
 170                 dev = lun->lun_se_dev;
 171                 /*
 172                  * By default in LIO-Target $FABRIC_MOD,
 173                  * demo_mode_write_protect is ON, or READ_ONLY;
 174                  */
 175                 if (!(TPG_TFO(tpg)->tpg_check_demo_mode_write_protect(tpg))) {
 176                         if (dev->dev_flags & DF_READ_ONLY)
 177                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 178                         else
 179                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 180                 } else {
 181                         /*
 182                          * Allow only optical drives to issue R/W in default RO
 183                          * demo mode.
 184                          */
 185                         if (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK)
 186                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 187                         else
 188                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
 189                 }
 190
 191                 printk(KERN_INFO "TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
 192                         " access for LUN in Demo Mode\n",
 193                         TPG_TFO(tpg)->get_fabric_name(),
 194                         TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
 195                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
 196                         "READ-WRITE" : "READ-ONLY");
 197
 198                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
 199                                 lun_access, acl, tpg, 1);
 200                 spin_lock(&tpg->tpg_lun_lock);
 201         }
 202         spin_unlock(&tpg->tpg_lun_lock);
 203 }
 204
 205 /*      core_set_queue_depth_for_node():
 206  *
 207  *
 208  */
 209 static int core_set_queue_depth_for_node(
 210         struct se_portal_group *tpg,
 211         struct se_node_acl *acl)
 212 {
 213         if (!acl->queue_depth) {
 214                 printk(KERN_ERR "Queue depth for %s Initiator Node: %s is 0,"
 215                         "defaulting to 1.\n", TPG_TFO(tpg)->get_fabric_name(),
 216                         acl->initiatorname);
 217                 acl->queue_depth = 1;
 218         }
 219
 220         return 0;
 221 }
 222
 223 /*      core_create_device_list_for_node():
 224  *
 225  *
 226  */
 227 static int core_create_device_list_for_node(struct se_node_acl *nacl)
 228 {
 229         struct se_dev_entry *deve;
 230         int i;
 231
 232         nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
 233                                 TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
 234         if (!(nacl->device_list)) {
 235                 printk(KERN_ERR "Unable to allocate memory for"
 236                         " struct se_node_acl->device_list\n");
 237                 return -1;
 238         }
 239         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 240                 deve = &nacl->device_list[i];
 241
 242                 atomic_set(&deve->ua_count, 0);
 243                 atomic_set(&deve->pr_ref_count, 0);
 244                 spin_lock_init(&deve->ua_lock);
 245                 INIT_LIST_HEAD(&deve->alua_port_list);
 246                 INIT_LIST_HEAD(&deve->ua_list);
 247         }
 248
 249         return 0;
 250 }
 251
 252 /*      core_tpg_check_initiator_node_acl()
 253  *
 254  *
 255  */
 256 struct se_node_acl *core_tpg_check_initiator_node_acl(
 257         struct se_portal_group *tpg,
 258         unsigned char *initiatorname)
 259 {
 260         struct se_node_acl *acl;
 261
 262         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
 263         if ((acl))
 264                 return acl;
 265
 266         if (!(TPG_TFO(tpg)->tpg_check_demo_mode(tpg)))
 267                 return NULL;
 268
 269         acl =  TPG_TFO(tpg)->tpg_alloc_fabric_acl(tpg);
 270         if (!(acl))
 271                 return NULL;
 272
 273         INIT_LIST_HEAD(&acl->acl_list);
 274         INIT_LIST_HEAD(&acl->acl_sess_list);
 275         spin_lock_init(&acl->device_list_lock);
 276         spin_lock_init(&acl->nacl_sess_lock);
 277         atomic_set(&acl->acl_pr_ref_count, 0);
 278         acl->queue_depth = TPG_TFO(tpg)->tpg_get_default_depth(tpg);
 279         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 280         acl->se_tpg = tpg;
 281         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 282         spin_lock_init(&acl->stats_lock);
 283         acl->dynamic_node_acl = 1;
 284
 285         TPG_TFO(tpg)->set_default_node_attributes(acl);
 286
 287         if (core_create_device_list_for_node(acl) < 0) {
 288                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 289                 return NULL;
 290         }
 291
 292         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 293                 core_free_device_list_for_node(acl, tpg);
 294                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 295                 return NULL;
 296         }
 297
 298         core_tpg_add_node_to_devs(acl, tpg);
 299
 300         spin_lock_bh(&tpg->acl_node_lock);
 301         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 302         tpg->num_node_acls++;
 303         spin_unlock_bh(&tpg->acl_node_lock);
 304
 305         printk("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
 306                 " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
 307                 TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
 308                 TPG_TFO(tpg)->get_fabric_name(), initiatorname);
 309
 310         return acl;
 311 }
 312 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
 313
 314 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 315 {
 316         while (atomic_read(&nacl->acl_pr_ref_count) != 0)
 317                 cpu_relax();
 318 }
 319
 320 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 321 {
 322         int i, ret;
 323         struct se_lun *lun;
 324
 325         spin_lock(&tpg->tpg_lun_lock);
 326         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 327                 lun = &tpg->tpg_lun_list[i];
 328
 329                 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
 330                     (lun->lun_se_dev == NULL))
 331                         continue;
 332
 333                 spin_unlock(&tpg->tpg_lun_lock);
 334                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
 335                 spin_lock(&tpg->tpg_lun_lock);
 336         }
 337         spin_unlock(&tpg->tpg_lun_lock);
 338 }
 339 EXPORT_SYMBOL(core_tpg_clear_object_luns);
 340
 341 /*      core_tpg_add_initiator_node_acl():
 342  *
 343  *
 344  */
 345 struct se_node_acl *core_tpg_add_initiator_node_acl(
 346         struct se_portal_group *tpg,
 347         struct se_node_acl *se_nacl,
 348         const char *initiatorname,
 349         u32 queue_depth)
 350 {
 351         struct se_node_acl *acl = NULL;
 352
 353         spin_lock_bh(&tpg->acl_node_lock);
 354         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 355         if ((acl)) {
 356                 if (acl->dynamic_node_acl) {
 357                         acl->dynamic_node_acl = 0;
 358                         printk(KERN_INFO "%s_TPG[%u] - Replacing dynamic ACL"
 359                                 " for %s\n", TPG_TFO(tpg)->get_fabric_name(),
 360                                 TPG_TFO(tpg)->tpg_get_tag(tpg), initiatorname);
 361                         spin_unlock_bh(&tpg->acl_node_lock);
 362                         /*
 363                          * Release the locally allocated struct se_node_acl
 364                          * because * core_tpg_add_initiator_node_acl() returned
 365                          * a pointer to an existing demo mode node ACL.
 366                          */
 367                         if (se_nacl)
 368                                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg,
 369                                                         se_nacl);
 370                         goto done;
 371                 }
 372
 373                 printk(KERN_ERR "ACL entry for %s Initiator"
 374                         " Node %s already exists for TPG %u, ignoring"
 375                         " request.\n",  TPG_TFO(tpg)->get_fabric_name(),
 376                         initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg));
 377                 spin_unlock_bh(&tpg->acl_node_lock);
 378                 return ERR_PTR(-EEXIST);
 379         }
 380         spin_unlock_bh(&tpg->acl_node_lock);
 381
 382         if (!(se_nacl)) {
 383                 printk("struct se_node_acl pointer is NULL\n");
 384                 return ERR_PTR(-EINVAL);
 385         }
 386         /*
 387          * For v4.x logic the se_node_acl_s is hanging off a fabric
 388          * dependent structure allocated via
 389          * struct target_core_fabric_ops->fabric_make_nodeacl()
 390          */
 391         acl = se_nacl;
 392
 393         INIT_LIST_HEAD(&acl->acl_list);
 394         INIT_LIST_HEAD(&acl->acl_sess_list);
 395         spin_lock_init(&acl->device_list_lock);
 396         spin_lock_init(&acl->nacl_sess_lock);
 397         atomic_set(&acl->acl_pr_ref_count, 0);
 398         acl->queue_depth = queue_depth;
 399         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
 400         acl->se_tpg = tpg;
 401         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
 402         spin_lock_init(&acl->stats_lock);
 403
 404         TPG_TFO(tpg)->set_default_node_attributes(acl);
 405
 406         if (core_create_device_list_for_node(acl) < 0) {
 407                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 408                 return ERR_PTR(-ENOMEM);
 409         }
 410
 411         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 412                 core_free_device_list_for_node(acl, tpg);
 413                 TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl);
 414                 return ERR_PTR(-EINVAL);
 415         }
 416
 417         spin_lock_bh(&tpg->acl_node_lock);
 418         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
 419         tpg->num_node_acls++;
 420         spin_unlock_bh(&tpg->acl_node_lock);
 421
 422 done:
 423         printk(KERN_INFO "%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
 424                 " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
 425                 TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
 426                 TPG_TFO(tpg)->get_fabric_name(), initiatorname);
 427
 428         return acl;
 429 }
 430 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
 431
 432 /*      core_tpg_del_initiator_node_acl():
 433  *
 434  *
 435  */
 436 int core_tpg_del_initiator_node_acl(
 437         struct se_portal_group *tpg,
 438         struct se_node_acl *acl,
 439         int force)
 440 {
 441         struct se_session *sess, *sess_tmp;
 442         int dynamic_acl = 0;
 443
 444         spin_lock_bh(&tpg->acl_node_lock);
 445         if (acl->dynamic_node_acl) {
 446                 acl->dynamic_node_acl = 0;
 447                 dynamic_acl = 1;
 448         }
 449         list_del(&acl->acl_list);
 450         tpg->num_node_acls--;
 451         spin_unlock_bh(&tpg->acl_node_lock);
 452
 453         spin_lock_bh(&tpg->session_lock);
 454         list_for_each_entry_safe(sess, sess_tmp,
 455                                 &tpg->tpg_sess_list, sess_list) {
 456                 if (sess->se_node_acl != acl)
 457                         continue;
 458                 /*
 459                  * Determine if the session needs to be closed by our context.
 460                  */
 461                 if (!(TPG_TFO(tpg)->shutdown_session(sess)))
 462                         continue;
 463
 464                 spin_unlock_bh(&tpg->session_lock);
 465                 /*
 466                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 467                  * forcefully shutdown the $FABRIC_MOD session/nexus.
 468                  */
 469                 TPG_TFO(tpg)->close_session(sess);
 470
 471                 spin_lock_bh(&tpg->session_lock);
 472         }
 473         spin_unlock_bh(&tpg->session_lock);
 474
 475         core_tpg_wait_for_nacl_pr_ref(acl);
 476         core_clear_initiator_node_from_tpg(acl, tpg);
 477         core_free_device_list_for_node(acl, tpg);
 478
 479         printk(KERN_INFO "%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
 480                 " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(),
 481                 TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth,
 482                 TPG_TFO(tpg)->get_fabric_name(), acl->initiatorname);
 483
 484         return 0;
 485 }
 486 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
 487
 488 /*      core_tpg_set_initiator_node_queue_depth():
 489  *
 490  *
 491  */
 492 int core_tpg_set_initiator_node_queue_depth(
 493         struct se_portal_group *tpg,
 494         unsigned char *initiatorname,
 495         u32 queue_depth,
 496         int force)
 497 {
 498         struct se_session *sess, *init_sess = NULL;
 499         struct se_node_acl *acl;
 500         int dynamic_acl = 0;
 501
 502         spin_lock_bh(&tpg->acl_node_lock);
 503         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
 504         if (!(acl)) {
 505                 printk(KERN_ERR "Access Control List entry for %s Initiator"
 506                         " Node %s does not exists for TPG %hu, ignoring"
 507                         " request.\n", TPG_TFO(tpg)->get_fabric_name(),
 508                         initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg));
 509                 spin_unlock_bh(&tpg->acl_node_lock);
 510                 return -ENODEV;
 511         }
 512         if (acl->dynamic_node_acl) {
 513                 acl->dynamic_node_acl = 0;
 514                 dynamic_acl = 1;
 515         }
 516         spin_unlock_bh(&tpg->acl_node_lock);
 517
 518         spin_lock_bh(&tpg->session_lock);
 519         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
 520                 if (sess->se_node_acl != acl)
 521                         continue;
 522
 523                 if (!force) {
 524                         printk(KERN_ERR "Unable to change queue depth for %s"
 525                                 " Initiator Node: %s while session is"
 526                                 " operational.  To forcefully change the queue"
 527                                 " depth and force session reinstatement"
 528                                 " use the \"force=1\" parameter.\n",
 529                                 TPG_TFO(tpg)->get_fabric_name(), initiatorname);
 530                         spin_unlock_bh(&tpg->session_lock);
 531
 532                         spin_lock_bh(&tpg->acl_node_lock);
 533                         if (dynamic_acl)
 534                                 acl->dynamic_node_acl = 1;
 535                         spin_unlock_bh(&tpg->acl_node_lock);
 536                         return -EEXIST;
 537                 }
 538                 /*
 539                  * Determine if the session needs to be closed by our context.
 540                  */
 541                 if (!(TPG_TFO(tpg)->shutdown_session(sess)))
 542                         continue;
 543
 544                 init_sess = sess;
 545                 break;
 546         }
 547
 548         /*
 549          * User has requested to change the queue depth for a Initiator Node.
 550          * Change the value in the Node's struct se_node_acl, and call
 551          * core_set_queue_depth_for_node() to add the requested queue depth.
 552          *
 553          * Finally call  TPG_TFO(tpg)->close_session() to force session
 554          * reinstatement to occur if there is an active session for the
 555          * $FABRIC_MOD Initiator Node in question.
 556          */
 557         acl->queue_depth = queue_depth;
 558
 559         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
 560                 spin_unlock_bh(&tpg->session_lock);
 561                 /*
 562                  * Force session reinstatement if
 563                  * core_set_queue_depth_for_node() failed, because we assume
 564                  * the $FABRIC_MOD has already the set session reinstatement
 565                  * bit from TPG_TFO(tpg)->shutdown_session() called above.
 566                  */
 567                 if (init_sess)
 568                         TPG_TFO(tpg)->close_session(init_sess);
 569
 570                 spin_lock_bh(&tpg->acl_node_lock);
 571                 if (dynamic_acl)
 572                         acl->dynamic_node_acl = 1;
 573                 spin_unlock_bh(&tpg->acl_node_lock);
 574                 return -EINVAL;
 575         }
 576         spin_unlock_bh(&tpg->session_lock);
 577         /*
 578          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
 579          * forcefully shutdown the $FABRIC_MOD session/nexus.
 580          */
 581         if (init_sess)
 582                 TPG_TFO(tpg)->close_session(init_sess);
 583
 584         printk(KERN_INFO "Successfuly changed queue depth to: %d for Initiator"
 585                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
 586                 initiatorname, TPG_TFO(tpg)->get_fabric_name(),
 587                 TPG_TFO(tpg)->tpg_get_tag(tpg));
 588
 589         spin_lock_bh(&tpg->acl_node_lock);
 590         if (dynamic_acl)
 591                 acl->dynamic_node_acl = 1;
 592         spin_unlock_bh(&tpg->acl_node_lock);
 593
 594         return 0;
 595 }
 596 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
 597
 598 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
 599 {
 600         /* Set in core_dev_setup_virtual_lun0() */
 601         struct se_device *dev = se_global->g_lun0_dev;
 602         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 603         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
 604         int ret;
 605
 606         lun->unpacked_lun = 0;
 607         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 608         atomic_set(&lun->lun_acl_count, 0);
 609         init_completion(&lun->lun_shutdown_comp);
 610         INIT_LIST_HEAD(&lun->lun_acl_list);
 611         INIT_LIST_HEAD(&lun->lun_cmd_list);
 612         spin_lock_init(&lun->lun_acl_lock);
 613         spin_lock_init(&lun->lun_cmd_lock);
 614         spin_lock_init(&lun->lun_sep_lock);
 615
 616         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
 617         if (ret < 0)
 618                 return -1;
 619
 620         return 0;
 621 }
 622
 623 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
 624 {
 625         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
 626
 627         core_tpg_post_dellun(se_tpg, lun);
 628 }
 629
 630 int core_tpg_register(
 631         struct target_core_fabric_ops *tfo,
 632         struct se_wwn *se_wwn,
 633         struct se_portal_group *se_tpg,
 634         void *tpg_fabric_ptr,
 635         int se_tpg_type)
 636 {
 637         struct se_lun *lun;
 638         u32 i;
 639
 640         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
 641                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
 642         if (!(se_tpg->tpg_lun_list)) {
 643                 printk(KERN_ERR "Unable to allocate struct se_portal_group->"
 644                                 "tpg_lun_list\n");
 645                 return -ENOMEM;
 646         }
 647
 648         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 649                 lun = &se_tpg->tpg_lun_list[i];
 650                 lun->unpacked_lun = i;
 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
 661         se_tpg->se_tpg_type = se_tpg_type;
 662         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
 663         se_tpg->se_tpg_tfo = tfo;
 664         se_tpg->se_tpg_wwn = se_wwn;
 665         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
 666         INIT_LIST_HEAD(&se_tpg->acl_node_list);
 667         INIT_LIST_HEAD(&se_tpg->se_tpg_list);
 668         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
 669         spin_lock_init(&se_tpg->acl_node_lock);
 670         spin_lock_init(&se_tpg->session_lock);
 671         spin_lock_init(&se_tpg->tpg_lun_lock);
 672
 673         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
 674                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
 675                         kfree(se_tpg);
 676                         return -ENOMEM;
 677                 }
 678         }
 679
 680         spin_lock_bh(&se_global->se_tpg_lock);
 681         list_add_tail(&se_tpg->se_tpg_list, &se_global->g_se_tpg_list);
 682         spin_unlock_bh(&se_global->se_tpg_lock);
 683
 684         printk(KERN_INFO "TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
 685                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
 686                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 687                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
 688                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
 689
 690         return 0;
 691 }
 692 EXPORT_SYMBOL(core_tpg_register);
 693
 694 int core_tpg_deregister(struct se_portal_group *se_tpg)
 695 {
 696         struct se_node_acl *nacl, *nacl_tmp;
 697
 698         printk(KERN_INFO "TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
 699                 " for endpoint: %s Portal Tag %u\n",
 700                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
 701                 "Normal" : "Discovery", TPG_TFO(se_tpg)->get_fabric_name(),
 702                 TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg),
 703                 TPG_TFO(se_tpg)->tpg_get_tag(se_tpg));
 704
 705         spin_lock_bh(&se_global->se_tpg_lock);
 706         list_del(&se_tpg->se_tpg_list);
 707         spin_unlock_bh(&se_global->se_tpg_lock);
 708
 709         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
 710                 cpu_relax();
 711         /*
 712          * Release any remaining demo-mode generated se_node_acl that have
 713          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
 714          * in transport_deregister_session().
 715          */
 716         spin_lock_bh(&se_tpg->acl_node_lock);
 717         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
 718                         acl_list) {
 719                 list_del(&nacl->acl_list);
 720                 se_tpg->num_node_acls--;
 721                 spin_unlock_bh(&se_tpg->acl_node_lock);
 722
 723                 core_tpg_wait_for_nacl_pr_ref(nacl);
 724                 core_free_device_list_for_node(nacl, se_tpg);
 725                 TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg, nacl);
 726
 727                 spin_lock_bh(&se_tpg->acl_node_lock);
 728         }
 729         spin_unlock_bh(&se_tpg->acl_node_lock);
 730
 731         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
 732                 core_tpg_release_virtual_lun0(se_tpg);
 733
 734         se_tpg->se_tpg_fabric_ptr = NULL;
 735         kfree(se_tpg->tpg_lun_list);
 736         return 0;
 737 }
 738 EXPORT_SYMBOL(core_tpg_deregister);
 739
 740 struct se_lun *core_tpg_pre_addlun(
 741         struct se_portal_group *tpg,
 742         u32 unpacked_lun)
 743 {
 744         struct se_lun *lun;
 745
 746         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 747                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 748                         "-1: %u for Target Portal Group: %u\n",
 749                         TPG_TFO(tpg)->get_fabric_name(),
 750                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
 751                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 752                 return ERR_PTR(-EOVERFLOW);
 753         }
 754
 755         spin_lock(&tpg->tpg_lun_lock);
 756         lun = &tpg->tpg_lun_list[unpacked_lun];
 757         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
 758                 printk(KERN_ERR "TPG Logical Unit Number: %u is already active"
 759                         " on %s Target Portal Group: %u, ignoring request.\n",
 760                         unpacked_lun, TPG_TFO(tpg)->get_fabric_name(),
 761                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 762                 spin_unlock(&tpg->tpg_lun_lock);
 763                 return ERR_PTR(-EINVAL);
 764         }
 765         spin_unlock(&tpg->tpg_lun_lock);
 766
 767         return lun;
 768 }
 769
 770 int core_tpg_post_addlun(
 771         struct se_portal_group *tpg,
 772         struct se_lun *lun,
 773         u32 lun_access,
 774         void *lun_ptr)
 775 {
 776         if (core_dev_export(lun_ptr, tpg, lun) < 0)
 777                 return -1;
 778
 779         spin_lock(&tpg->tpg_lun_lock);
 780         lun->lun_access = lun_access;
 781         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
 782         spin_unlock(&tpg->tpg_lun_lock);
 783
 784         return 0;
 785 }
 786
 787 static void core_tpg_shutdown_lun(
 788         struct se_portal_group *tpg,
 789         struct se_lun *lun)
 790 {
 791         core_clear_lun_from_tpg(lun, tpg);
 792         transport_clear_lun_from_sessions(lun);
 793 }
 794
 795 struct se_lun *core_tpg_pre_dellun(
 796         struct se_portal_group *tpg,
 797         u32 unpacked_lun,
 798         int *ret)
 799 {
 800         struct se_lun *lun;
 801
 802         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
 803                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
 804                         "-1: %u for Target Portal Group: %u\n",
 805                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
 806                         TRANSPORT_MAX_LUNS_PER_TPG-1,
 807                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 808                 return ERR_PTR(-EOVERFLOW);
 809         }
 810
 811         spin_lock(&tpg->tpg_lun_lock);
 812         lun = &tpg->tpg_lun_list[unpacked_lun];
 813         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
 814                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
 815                         " Target Portal Group: %u, ignoring request.\n",
 816                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
 817                         TPG_TFO(tpg)->tpg_get_tag(tpg));
 818                 spin_unlock(&tpg->tpg_lun_lock);
 819                 return ERR_PTR(-ENODEV);
 820         }
 821         spin_unlock(&tpg->tpg_lun_lock);
 822
 823         return lun;
 824 }
 825
 826 int core_tpg_post_dellun(
 827         struct se_portal_group *tpg,
 828         struct se_lun *lun)
 829 {
 830         core_tpg_shutdown_lun(tpg, lun);
 831
 832         core_dev_unexport(lun->lun_se_dev, tpg, lun);
 833
 834         spin_lock(&tpg->tpg_lun_lock);
 835         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
 836         spin_unlock(&tpg->tpg_lun_lock);
 837
 838         return 0;
 839 }