drivers/target/target_core_device.c

   1 /*******************************************************************************
   2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3  *
   4  * This file contains the TCM Virtual Device and Disk Transport
   5  * agnostic related functions.
   6  *
   7  * (c) Copyright 2003-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/net.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/timer.h>
  31 #include <linux/slab.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kthread.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_device.h>
  40
  41 #include <target/target_core_base.h>
  42 #include <target/target_core_backend.h>
  43 #include <target/target_core_fabric.h>
  44
  45 #include "target_core_internal.h"
  46 #include "target_core_alua.h"
  47 #include "target_core_pr.h"
  48 #include "target_core_ua.h"
  49
  50 DEFINE_MUTEX(g_device_mutex);
  51 LIST_HEAD(g_device_list);
  52
  53 static struct se_hba *lun0_hba;
  54 /* not static, needed by tpg.c */
  55 struct se_device *g_lun0_dev;
  56
  57 sense_reason_t
  58 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  59 {
  60         struct se_lun *se_lun = NULL;
  61         struct se_session *se_sess = se_cmd->se_sess;
  62         struct se_device *dev;
  63         unsigned long flags;
  64
  65         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
  66                 return TCM_NON_EXISTENT_LUN;
  67
  68         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  69         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  70         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  71                 struct se_dev_entry *deve = se_cmd->se_deve;
  72
  73                 deve->total_cmds++;
  74
  75                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  76                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  77                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  78                                 " Access for 0x%08x\n",
  79                                 se_cmd->se_tfo->get_fabric_name(),
  80                                 unpacked_lun);
  81                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  82                         return TCM_WRITE_PROTECTED;
  83                 }
  84
  85                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  86                         deve->write_bytes += se_cmd->data_length;
  87                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  88                         deve->read_bytes += se_cmd->data_length;
  89
  90                 se_lun = deve->se_lun;
  91                 se_cmd->se_lun = deve->se_lun;
  92                 se_cmd->pr_res_key = deve->pr_res_key;
  93                 se_cmd->orig_fe_lun = unpacked_lun;
  94                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  95
  96                 percpu_ref_get(&se_lun->lun_ref);
  97                 se_cmd->lun_ref_active = true;
  98         }
  99         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 100
 101         if (!se_lun) {
 102                 /*
 103                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 104                  * REPORT_LUNS, et al to be returned when no active
 105                  * MappedLUN=0 exists for this Initiator Port.
 106                  */
 107                 if (unpacked_lun != 0) {
 108                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 109                                 " Access for 0x%08x\n",
 110                                 se_cmd->se_tfo->get_fabric_name(),
 111                                 unpacked_lun);
 112                         return TCM_NON_EXISTENT_LUN;
 113                 }
 114                 /*
 115                  * Force WRITE PROTECT for virtual LUN 0
 116                  */
 117                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 118                     (se_cmd->data_direction != DMA_NONE))
 119                         return TCM_WRITE_PROTECTED;
 120
 121                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 122                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 123                 se_cmd->orig_fe_lun = 0;
 124                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 125
 126                 percpu_ref_get(&se_lun->lun_ref);
 127                 se_cmd->lun_ref_active = true;
 128         }
 129
 130         /* Directly associate cmd with se_dev */
 131         se_cmd->se_dev = se_lun->lun_se_dev;
 132
 133         dev = se_lun->lun_se_dev;
 134         atomic_long_inc(&dev->num_cmds);
 135         if (se_cmd->data_direction == DMA_TO_DEVICE)
 136                 atomic_long_add(se_cmd->data_length, &dev->write_bytes);
 137         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 138                 atomic_long_add(se_cmd->data_length, &dev->read_bytes);
 139
 140         return 0;
 141 }
 142 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 143
 144 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 145 {
 146         struct se_dev_entry *deve;
 147         struct se_lun *se_lun = NULL;
 148         struct se_session *se_sess = se_cmd->se_sess;
 149         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 150         unsigned long flags;
 151
 152         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
 153                 return -ENODEV;
 154
 155         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 156         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 157         deve = se_cmd->se_deve;
 158
 159         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 160                 se_tmr->tmr_lun = deve->se_lun;
 161                 se_cmd->se_lun = deve->se_lun;
 162                 se_lun = deve->se_lun;
 163                 se_cmd->pr_res_key = deve->pr_res_key;
 164                 se_cmd->orig_fe_lun = unpacked_lun;
 165         }
 166         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 167
 168         if (!se_lun) {
 169                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 170                         " Access for 0x%08x\n",
 171                         se_cmd->se_tfo->get_fabric_name(),
 172                         unpacked_lun);
 173                 return -ENODEV;
 174         }
 175
 176         /* Directly associate cmd with se_dev */
 177         se_cmd->se_dev = se_lun->lun_se_dev;
 178         se_tmr->tmr_dev = se_lun->lun_se_dev;
 179
 180         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 181         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 182         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 183
 184         return 0;
 185 }
 186 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 187
 188 /*
 189  * This function is called from core_scsi3_emulate_pro_register_and_move()
 190  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 191  * when a matching rtpi is found.
 192  */
 193 struct se_dev_entry *core_get_se_deve_from_rtpi(
 194         struct se_node_acl *nacl,
 195         u16 rtpi)
 196 {
 197         struct se_dev_entry *deve;
 198         struct se_lun *lun;
 199         struct se_port *port;
 200         struct se_portal_group *tpg = nacl->se_tpg;
 201         u32 i;
 202
 203         spin_lock_irq(&nacl->device_list_lock);
 204         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 205                 deve = nacl->device_list[i];
 206
 207                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 208                         continue;
 209
 210                 lun = deve->se_lun;
 211                 if (!lun) {
 212                         pr_err("%s device entries device pointer is"
 213                                 " NULL, but Initiator has access.\n",
 214                                 tpg->se_tpg_tfo->get_fabric_name());
 215                         continue;
 216                 }
 217                 port = lun->lun_sep;
 218                 if (!port) {
 219                         pr_err("%s device entries device pointer is"
 220                                 " NULL, but Initiator has access.\n",
 221                                 tpg->se_tpg_tfo->get_fabric_name());
 222                         continue;
 223                 }
 224                 if (port->sep_rtpi != rtpi)
 225                         continue;
 226
 227                 atomic_inc_mb(&deve->pr_ref_count);
 228                 spin_unlock_irq(&nacl->device_list_lock);
 229
 230                 return deve;
 231         }
 232         spin_unlock_irq(&nacl->device_list_lock);
 233
 234         return NULL;
 235 }
 236
 237 int core_free_device_list_for_node(
 238         struct se_node_acl *nacl,
 239         struct se_portal_group *tpg)
 240 {
 241         struct se_dev_entry *deve;
 242         struct se_lun *lun;
 243         u32 i;
 244
 245         if (!nacl->device_list)
 246                 return 0;
 247
 248         spin_lock_irq(&nacl->device_list_lock);
 249         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 250                 deve = nacl->device_list[i];
 251
 252                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 253                         continue;
 254
 255                 if (!deve->se_lun) {
 256                         pr_err("%s device entries device pointer is"
 257                                 " NULL, but Initiator has access.\n",
 258                                 tpg->se_tpg_tfo->get_fabric_name());
 259                         continue;
 260                 }
 261                 lun = deve->se_lun;
 262
 263                 spin_unlock_irq(&nacl->device_list_lock);
 264                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 265                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 266                 spin_lock_irq(&nacl->device_list_lock);
 267         }
 268         spin_unlock_irq(&nacl->device_list_lock);
 269
 270         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 271         nacl->device_list = NULL;
 272
 273         return 0;
 274 }
 275
 276 void core_update_device_list_access(
 277         u32 mapped_lun,
 278         u32 lun_access,
 279         struct se_node_acl *nacl)
 280 {
 281         struct se_dev_entry *deve;
 282
 283         spin_lock_irq(&nacl->device_list_lock);
 284         deve = nacl->device_list[mapped_lun];
 285         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 286                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 287                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 288         } else {
 289                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 290                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 291         }
 292         spin_unlock_irq(&nacl->device_list_lock);
 293 }
 294
 295 /*      core_enable_device_list_for_node():
 296  *
 297  *
 298  */
 299 int core_enable_device_list_for_node(
 300         struct se_lun *lun,
 301         struct se_lun_acl *lun_acl,
 302         u32 mapped_lun,
 303         u32 lun_access,
 304         struct se_node_acl *nacl,
 305         struct se_portal_group *tpg)
 306 {
 307         struct se_port *port = lun->lun_sep;
 308         struct se_dev_entry *deve;
 309
 310         spin_lock_irq(&nacl->device_list_lock);
 311
 312         deve = nacl->device_list[mapped_lun];
 313
 314         /*
 315          * Check if the call is handling demo mode -> explicit LUN ACL
 316          * transition.  This transition must be for the same struct se_lun
 317          * + mapped_lun that was setup in demo mode..
 318          */
 319         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 320                 if (deve->se_lun_acl != NULL) {
 321                         pr_err("struct se_dev_entry->se_lun_acl"
 322                                " already set for demo mode -> explicit"
 323                                " LUN ACL transition\n");
 324                         spin_unlock_irq(&nacl->device_list_lock);
 325                         return -EINVAL;
 326                 }
 327                 if (deve->se_lun != lun) {
 328                         pr_err("struct se_dev_entry->se_lun does"
 329                                " match passed struct se_lun for demo mode"
 330                                " -> explicit LUN ACL transition\n");
 331                         spin_unlock_irq(&nacl->device_list_lock);
 332                         return -EINVAL;
 333                 }
 334                 deve->se_lun_acl = lun_acl;
 335
 336                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 337                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 338                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 339                 } else {
 340                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 341                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 342                 }
 343
 344                 spin_unlock_irq(&nacl->device_list_lock);
 345                 return 0;
 346         }
 347
 348         deve->se_lun = lun;
 349         deve->se_lun_acl = lun_acl;
 350         deve->mapped_lun = mapped_lun;
 351         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 352
 353         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 354                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 355                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 356         } else {
 357                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 358                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 359         }
 360
 361         deve->creation_time = get_jiffies_64();
 362         deve->attach_count++;
 363         spin_unlock_irq(&nacl->device_list_lock);
 364
 365         spin_lock_bh(&port->sep_alua_lock);
 366         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 367         spin_unlock_bh(&port->sep_alua_lock);
 368
 369         return 0;
 370 }
 371
 372 /*      core_disable_device_list_for_node():
 373  *
 374  *
 375  */
 376 int core_disable_device_list_for_node(
 377         struct se_lun *lun,
 378         struct se_lun_acl *lun_acl,
 379         u32 mapped_lun,
 380         u32 lun_access,
 381         struct se_node_acl *nacl,
 382         struct se_portal_group *tpg)
 383 {
 384         struct se_port *port = lun->lun_sep;
 385         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 386
 387         /*
 388          * If the MappedLUN entry is being disabled, the entry in
 389          * port->sep_alua_list must be removed now before clearing the
 390          * struct se_dev_entry pointers below as logic in
 391          * core_alua_do_transition_tg_pt() depends on these being present.
 392          *
 393          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 394          * that have not been explicitly converted to MappedLUNs ->
 395          * struct se_lun_acl, but we remove deve->alua_port_list from
 396          * port->sep_alua_list. This also means that active UAs and
 397          * NodeACL context specific PR metadata for demo-mode
 398          * MappedLUN *deve will be released below..
 399          */
 400         spin_lock_bh(&port->sep_alua_lock);
 401         list_del(&deve->alua_port_list);
 402         spin_unlock_bh(&port->sep_alua_lock);
 403         /*
 404          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 405          * PR operation to complete.
 406          */
 407         while (atomic_read(&deve->pr_ref_count) != 0)
 408                 cpu_relax();
 409
 410         spin_lock_irq(&nacl->device_list_lock);
 411         /*
 412          * Disable struct se_dev_entry LUN ACL mapping
 413          */
 414         core_scsi3_ua_release_all(deve);
 415         deve->se_lun = NULL;
 416         deve->se_lun_acl = NULL;
 417         deve->lun_flags = 0;
 418         deve->creation_time = 0;
 419         deve->attach_count--;
 420         spin_unlock_irq(&nacl->device_list_lock);
 421
 422         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 423         return 0;
 424 }
 425
 426 /*      core_clear_lun_from_tpg():
 427  *
 428  *
 429  */
 430 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 431 {
 432         struct se_node_acl *nacl;
 433         struct se_dev_entry *deve;
 434         u32 i;
 435
 436         spin_lock_irq(&tpg->acl_node_lock);
 437         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 438                 spin_unlock_irq(&tpg->acl_node_lock);
 439
 440                 spin_lock_irq(&nacl->device_list_lock);
 441                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 442                         deve = nacl->device_list[i];
 443                         if (lun != deve->se_lun)
 444                                 continue;
 445                         spin_unlock_irq(&nacl->device_list_lock);
 446
 447                         core_disable_device_list_for_node(lun, NULL,
 448                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 449                                 nacl, tpg);
 450
 451                         spin_lock_irq(&nacl->device_list_lock);
 452                 }
 453                 spin_unlock_irq(&nacl->device_list_lock);
 454
 455                 spin_lock_irq(&tpg->acl_node_lock);
 456         }
 457         spin_unlock_irq(&tpg->acl_node_lock);
 458 }
 459
 460 static struct se_port *core_alloc_port(struct se_device *dev)
 461 {
 462         struct se_port *port, *port_tmp;
 463
 464         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 465         if (!port) {
 466                 pr_err("Unable to allocate struct se_port\n");
 467                 return ERR_PTR(-ENOMEM);
 468         }
 469         INIT_LIST_HEAD(&port->sep_alua_list);
 470         INIT_LIST_HEAD(&port->sep_list);
 471         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 472         spin_lock_init(&port->sep_alua_lock);
 473         mutex_init(&port->sep_tg_pt_md_mutex);
 474
 475         spin_lock(&dev->se_port_lock);
 476         if (dev->dev_port_count == 0x0000ffff) {
 477                 pr_warn("Reached dev->dev_port_count =="
 478                                 " 0x0000ffff\n");
 479                 spin_unlock(&dev->se_port_lock);
 480                 return ERR_PTR(-ENOSPC);
 481         }
 482 again:
 483         /*
 484          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 485          * Here is the table from spc4r17 section 7.7.3.8.
 486          *
 487          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 488          *
 489          * Code      Description
 490          * 0h        Reserved
 491          * 1h        Relative port 1, historically known as port A
 492          * 2h        Relative port 2, historically known as port B
 493          * 3h to FFFFh    Relative port 3 through 65 535
 494          */
 495         port->sep_rtpi = dev->dev_rpti_counter++;
 496         if (!port->sep_rtpi)
 497                 goto again;
 498
 499         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 500                 /*
 501                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 502                  * for 16-bit wrap..
 503                  */
 504                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 505                         goto again;
 506         }
 507         spin_unlock(&dev->se_port_lock);
 508
 509         return port;
 510 }
 511
 512 static void core_export_port(
 513         struct se_device *dev,
 514         struct se_portal_group *tpg,
 515         struct se_port *port,
 516         struct se_lun *lun)
 517 {
 518         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 519
 520         spin_lock(&dev->se_port_lock);
 521         spin_lock(&lun->lun_sep_lock);
 522         port->sep_tpg = tpg;
 523         port->sep_lun = lun;
 524         lun->lun_sep = port;
 525         spin_unlock(&lun->lun_sep_lock);
 526
 527         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 528         spin_unlock(&dev->se_port_lock);
 529
 530         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
 531             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
 532                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 533                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 534                         pr_err("Unable to allocate t10_alua_tg_pt"
 535                                         "_gp_member_t\n");
 536                         return;
 537                 }
 538                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 539                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 540                         dev->t10_alua.default_tg_pt_gp);
 541                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 542                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 543                         " Group: alua/default_tg_pt_gp\n",
 544                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 545         }
 546
 547         dev->dev_port_count++;
 548         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 549 }
 550
 551 /*
 552  *      Called with struct se_device->se_port_lock spinlock held.
 553  */
 554 static void core_release_port(struct se_device *dev, struct se_port *port)
 555         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 556 {
 557         /*
 558          * Wait for any port reference for PR ALL_TG_PT=1 operation
 559          * to complete in __core_scsi3_alloc_registration()
 560          */
 561         spin_unlock(&dev->se_port_lock);
 562         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 563                 cpu_relax();
 564         spin_lock(&dev->se_port_lock);
 565
 566         core_alua_free_tg_pt_gp_mem(port);
 567
 568         list_del(&port->sep_list);
 569         dev->dev_port_count--;
 570         kfree(port);
 571 }
 572
 573 int core_dev_export(
 574         struct se_device *dev,
 575         struct se_portal_group *tpg,
 576         struct se_lun *lun)
 577 {
 578         struct se_hba *hba = dev->se_hba;
 579         struct se_port *port;
 580
 581         port = core_alloc_port(dev);
 582         if (IS_ERR(port))
 583                 return PTR_ERR(port);
 584
 585         lun->lun_se_dev = dev;
 586
 587         spin_lock(&hba->device_lock);
 588         dev->export_count++;
 589         spin_unlock(&hba->device_lock);
 590
 591         core_export_port(dev, tpg, port, lun);
 592         return 0;
 593 }
 594
 595 void core_dev_unexport(
 596         struct se_device *dev,
 597         struct se_portal_group *tpg,
 598         struct se_lun *lun)
 599 {
 600         struct se_hba *hba = dev->se_hba;
 601         struct se_port *port = lun->lun_sep;
 602
 603         spin_lock(&lun->lun_sep_lock);
 604         if (lun->lun_se_dev == NULL) {
 605                 spin_unlock(&lun->lun_sep_lock);
 606                 return;
 607         }
 608         spin_unlock(&lun->lun_sep_lock);
 609
 610         spin_lock(&dev->se_port_lock);
 611         core_release_port(dev, port);
 612         spin_unlock(&dev->se_port_lock);
 613
 614         spin_lock(&hba->device_lock);
 615         dev->export_count--;
 616         spin_unlock(&hba->device_lock);
 617
 618         lun->lun_sep = NULL;
 619         lun->lun_se_dev = NULL;
 620 }
 621
 622 static void se_release_vpd_for_dev(struct se_device *dev)
 623 {
 624         struct t10_vpd *vpd, *vpd_tmp;
 625
 626         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 627         list_for_each_entry_safe(vpd, vpd_tmp,
 628                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 629                 list_del(&vpd->vpd_list);
 630                 kfree(vpd);
 631         }
 632         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 633 }
 634
 635 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 636 {
 637         u32 aligned_max_sectors;
 638         u32 alignment;
 639         /*
 640          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 641          * transport_allocate_data_tasks() operation.
 642          */
 643         alignment = max(1ul, PAGE_SIZE / block_size);
 644         aligned_max_sectors = rounddown(max_sectors, alignment);
 645
 646         if (max_sectors != aligned_max_sectors)
 647                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 648                         max_sectors, aligned_max_sectors);
 649
 650         return aligned_max_sectors;
 651 }
 652
 653 bool se_dev_check_wce(struct se_device *dev)
 654 {
 655         bool wce = false;
 656
 657         if (dev->transport->get_write_cache)
 658                 wce = dev->transport->get_write_cache(dev);
 659         else if (dev->dev_attrib.emulate_write_cache > 0)
 660                 wce = true;
 661
 662         return wce;
 663 }
 664
 665 int se_dev_set_max_unmap_lba_count(
 666         struct se_device *dev,
 667         u32 max_unmap_lba_count)
 668 {
 669         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 670         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 671                         dev, dev->dev_attrib.max_unmap_lba_count);
 672         return 0;
 673 }
 674 EXPORT_SYMBOL(se_dev_set_max_unmap_lba_count);
 675
 676 int se_dev_set_max_unmap_block_desc_count(
 677         struct se_device *dev,
 678         u32 max_unmap_block_desc_count)
 679 {
 680         dev->dev_attrib.max_unmap_block_desc_count =
 681                 max_unmap_block_desc_count;
 682         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 683                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 684         return 0;
 685 }
 686 EXPORT_SYMBOL(se_dev_set_max_unmap_block_desc_count);
 687
 688 int se_dev_set_unmap_granularity(
 689         struct se_device *dev,
 690         u32 unmap_granularity)
 691 {
 692         dev->dev_attrib.unmap_granularity = unmap_granularity;
 693         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 694                         dev, dev->dev_attrib.unmap_granularity);
 695         return 0;
 696 }
 697 EXPORT_SYMBOL(se_dev_set_unmap_granularity);
 698
 699 int se_dev_set_unmap_granularity_alignment(
 700         struct se_device *dev,
 701         u32 unmap_granularity_alignment)
 702 {
 703         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 704         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 705                         dev, dev->dev_attrib.unmap_granularity_alignment);
 706         return 0;
 707 }
 708 EXPORT_SYMBOL(se_dev_set_unmap_granularity_alignment);
 709
 710 int se_dev_set_max_write_same_len(
 711         struct se_device *dev,
 712         u32 max_write_same_len)
 713 {
 714         dev->dev_attrib.max_write_same_len = max_write_same_len;
 715         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 716                         dev, dev->dev_attrib.max_write_same_len);
 717         return 0;
 718 }
 719 EXPORT_SYMBOL(se_dev_set_max_write_same_len);
 720
 721 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 722 {
 723         const char *configname;
 724
 725         configname = config_item_name(&dev->dev_group.cg_item);
 726         if (strlen(configname) >= 16) {
 727                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 728                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 729                         configname);
 730         }
 731         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 732 }
 733
 734 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 735 {
 736         if (dev->export_count) {
 737                 pr_err("dev[%p]: Unable to change model alias"
 738                         " while export_count is %d\n",
 739                         dev, dev->export_count);
 740                         return -EINVAL;
 741         }
 742
 743         if (flag != 0 && flag != 1) {
 744                 pr_err("Illegal value %d\n", flag);
 745                 return -EINVAL;
 746         }
 747
 748         if (flag) {
 749                 dev_set_t10_wwn_model_alias(dev);
 750         } else {
 751                 strncpy(&dev->t10_wwn.model[0],
 752                         dev->transport->inquiry_prod, 16);
 753         }
 754         dev->dev_attrib.emulate_model_alias = flag;
 755
 756         return 0;
 757 }
 758 EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
 759
 760 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 761 {
 762         if (flag != 0 && flag != 1) {
 763                 pr_err("Illegal value %d\n", flag);
 764                 return -EINVAL;
 765         }
 766
 767         if (flag) {
 768                 pr_err("dpo_emulated not supported\n");
 769                 return -EINVAL;
 770         }
 771
 772         return 0;
 773 }
 774 EXPORT_SYMBOL(se_dev_set_emulate_dpo);
 775
 776 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 777 {
 778         if (flag != 0 && flag != 1) {
 779                 pr_err("Illegal value %d\n", flag);
 780                 return -EINVAL;
 781         }
 782         if (flag &&
 783             dev->transport->get_write_cache) {
 784                 pr_warn("emulate_fua_write not supported for this device, ignoring\n");
 785                 return 0;
 786         }
 787         if (dev->export_count) {
 788                 pr_err("emulate_fua_write cannot be changed with active"
 789                        " exports: %d\n", dev->export_count);
 790                 return -EINVAL;
 791         }
 792         dev->dev_attrib.emulate_fua_write = flag;
 793         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 794                         dev, dev->dev_attrib.emulate_fua_write);
 795         return 0;
 796 }
 797 EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
 798
 799 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 800 {
 801         if (flag != 0 && flag != 1) {
 802                 pr_err("Illegal value %d\n", flag);
 803                 return -EINVAL;
 804         }
 805
 806         if (flag) {
 807                 pr_err("ua read emulated not supported\n");
 808                 return -EINVAL;
 809         }
 810
 811         return 0;
 812 }
 813 EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
 814
 815 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 816 {
 817         if (flag != 0 && flag != 1) {
 818                 pr_err("Illegal value %d\n", flag);
 819                 return -EINVAL;
 820         }
 821         if (flag &&
 822             dev->transport->get_write_cache) {
 823                 pr_err("emulate_write_cache not supported for this device\n");
 824                 return -EINVAL;
 825         }
 826         if (dev->export_count) {
 827                 pr_err("emulate_write_cache cannot be changed with active"
 828                        " exports: %d\n", dev->export_count);
 829                 return -EINVAL;
 830         }
 831         dev->dev_attrib.emulate_write_cache = flag;
 832         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 833                         dev, dev->dev_attrib.emulate_write_cache);
 834         return 0;
 835 }
 836 EXPORT_SYMBOL(se_dev_set_emulate_write_cache);
 837
 838 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 839 {
 840         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 841                 pr_err("Illegal value %d\n", flag);
 842                 return -EINVAL;
 843         }
 844
 845         if (dev->export_count) {
 846                 pr_err("dev[%p]: Unable to change SE Device"
 847                         " UA_INTRLCK_CTRL while export_count is %d\n",
 848                         dev, dev->export_count);
 849                 return -EINVAL;
 850         }
 851         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 852         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 853                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 854
 855         return 0;
 856 }
 857 EXPORT_SYMBOL(se_dev_set_emulate_ua_intlck_ctrl);
 858
 859 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 860 {
 861         if ((flag != 0) && (flag != 1)) {
 862                 pr_err("Illegal value %d\n", flag);
 863                 return -EINVAL;
 864         }
 865
 866         if (dev->export_count) {
 867                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 868                         " export_count is %d\n",
 869                         dev, dev->export_count);
 870                 return -EINVAL;
 871         }
 872         dev->dev_attrib.emulate_tas = flag;
 873         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 874                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 875
 876         return 0;
 877 }
 878 EXPORT_SYMBOL(se_dev_set_emulate_tas);
 879
 880 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 881 {
 882         if ((flag != 0) && (flag != 1)) {
 883                 pr_err("Illegal value %d\n", flag);
 884                 return -EINVAL;
 885         }
 886         /*
 887          * We expect this value to be non-zero when generic Block Layer
 888          * Discard supported is detected iblock_create_virtdevice().
 889          */
 890         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 891                 pr_err("Generic Block Discard not supported\n");
 892                 return -ENOSYS;
 893         }
 894
 895         dev->dev_attrib.emulate_tpu = flag;
 896         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 897                                 dev, flag);
 898         return 0;
 899 }
 900 EXPORT_SYMBOL(se_dev_set_emulate_tpu);
 901
 902 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 903 {
 904         if ((flag != 0) && (flag != 1)) {
 905                 pr_err("Illegal value %d\n", flag);
 906                 return -EINVAL;
 907         }
 908         /*
 909          * We expect this value to be non-zero when generic Block Layer
 910          * Discard supported is detected iblock_create_virtdevice().
 911          */
 912         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 913                 pr_err("Generic Block Discard not supported\n");
 914                 return -ENOSYS;
 915         }
 916
 917         dev->dev_attrib.emulate_tpws = flag;
 918         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 919                                 dev, flag);
 920         return 0;
 921 }
 922 EXPORT_SYMBOL(se_dev_set_emulate_tpws);
 923
 924 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
 925 {
 926         if (flag != 0 && flag != 1) {
 927                 pr_err("Illegal value %d\n", flag);
 928                 return -EINVAL;
 929         }
 930         dev->dev_attrib.emulate_caw = flag;
 931         pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
 932                  dev, flag);
 933
 934         return 0;
 935 }
 936 EXPORT_SYMBOL(se_dev_set_emulate_caw);
 937
 938 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
 939 {
 940         if (flag != 0 && flag != 1) {
 941                 pr_err("Illegal value %d\n", flag);
 942                 return -EINVAL;
 943         }
 944         dev->dev_attrib.emulate_3pc = flag;
 945         pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
 946                 dev, flag);
 947
 948         return 0;
 949 }
 950 EXPORT_SYMBOL(se_dev_set_emulate_3pc);
 951
 952 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
 953 {
 954         int rc, old_prot = dev->dev_attrib.pi_prot_type;
 955
 956         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 957                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 958                 return -EINVAL;
 959         }
 960         if (flag == 2) {
 961                 pr_err("DIF TYPE2 protection currently not supported\n");
 962                 return -ENOSYS;
 963         }
 964         if (dev->dev_attrib.hw_pi_prot_type) {
 965                 pr_warn("DIF protection enabled on underlying hardware,"
 966                         " ignoring\n");
 967                 return 0;
 968         }
 969         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 970                 /* 0 is only allowed value for non-supporting backends */
 971                 if (flag == 0)
 972                         return 0;
 973
 974                 pr_err("DIF protection not supported by backend: %s\n",
 975                        dev->transport->name);
 976                 return -ENOSYS;
 977         }
 978         if (!(dev->dev_flags & DF_CONFIGURED)) {
 979                 pr_err("DIF protection requires device to be configured\n");
 980                 return -ENODEV;
 981         }
 982         if (dev->export_count) {
 983                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 984                        " export_count is %d\n", dev, dev->export_count);
 985                 return -EINVAL;
 986         }
 987
 988         dev->dev_attrib.pi_prot_type = flag;
 989
 990         if (flag && !old_prot) {
 991                 rc = dev->transport->init_prot(dev);
 992                 if (rc) {
 993                         dev->dev_attrib.pi_prot_type = old_prot;
 994                         return rc;
 995                 }
 996
 997         } else if (!flag && old_prot) {
 998                 dev->transport->free_prot(dev);
 999         }
1000         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
1001
1002         return 0;
1003 }
1004 EXPORT_SYMBOL(se_dev_set_pi_prot_type);
1005
1006 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
1007 {
1008         int rc;
1009
1010         if (!flag)
1011                 return 0;
1012
1013         if (flag != 1) {
1014                 pr_err("Illegal value %d for pi_prot_format\n", flag);
1015                 return -EINVAL;
1016         }
1017         if (!dev->transport->format_prot) {
1018                 pr_err("DIF protection format not supported by backend %s\n",
1019                        dev->transport->name);
1020                 return -ENOSYS;
1021         }
1022         if (!(dev->dev_flags & DF_CONFIGURED)) {
1023                 pr_err("DIF protection format requires device to be configured\n");
1024                 return -ENODEV;
1025         }
1026         if (dev->export_count) {
1027                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
1028                        " export_count is %d\n", dev, dev->export_count);
1029                 return -EINVAL;
1030         }
1031
1032         rc = dev->transport->format_prot(dev);
1033         if (rc)
1034                 return rc;
1035
1036         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1037
1038         return 0;
1039 }
1040 EXPORT_SYMBOL(se_dev_set_pi_prot_format);
1041
1042 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1043 {
1044         if ((flag != 0) && (flag != 1)) {
1045                 pr_err("Illegal value %d\n", flag);
1046                 return -EINVAL;
1047         }
1048         dev->dev_attrib.enforce_pr_isids = flag;
1049         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1050                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1051         return 0;
1052 }
1053 EXPORT_SYMBOL(se_dev_set_enforce_pr_isids);
1054
1055 int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
1056 {
1057         if ((flag != 0) && (flag != 1)) {
1058                 printk(KERN_ERR "Illegal value %d\n", flag);
1059                 return -EINVAL;
1060         }
1061         if (dev->export_count) {
1062                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
1063                        " export_count is %d\n", dev, dev->export_count);
1064                 return -EINVAL;
1065         }
1066
1067         dev->dev_attrib.force_pr_aptpl = flag;
1068         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
1069         return 0;
1070 }
1071 EXPORT_SYMBOL(se_dev_set_force_pr_aptpl);
1072
1073 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1074 {
1075         if ((flag != 0) && (flag != 1)) {
1076                 printk(KERN_ERR "Illegal value %d\n", flag);
1077                 return -EINVAL;
1078         }
1079         dev->dev_attrib.is_nonrot = flag;
1080         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1081                dev, flag);
1082         return 0;
1083 }
1084 EXPORT_SYMBOL(se_dev_set_is_nonrot);
1085
1086 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1087 {
1088         if (flag != 0) {
1089                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1090                         " reordering not implemented\n", dev);
1091                 return -ENOSYS;
1092         }
1093         dev->dev_attrib.emulate_rest_reord = flag;
1094         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1095         return 0;
1096 }
1097 EXPORT_SYMBOL(se_dev_set_emulate_rest_reord);
1098
1099 /*
1100  * Note, this can only be called on unexported SE Device Object.
1101  */
1102 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1103 {
1104         if (dev->export_count) {
1105                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1106                         " export_count is %d\n",
1107                         dev, dev->export_count);
1108                 return -EINVAL;
1109         }
1110         if (!queue_depth) {
1111                 pr_err("dev[%p]: Illegal ZERO value for queue"
1112                         "_depth\n", dev);
1113                 return -EINVAL;
1114         }
1115
1116         if (queue_depth > dev->dev_attrib.queue_depth) {
1117                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1118                         pr_err("dev[%p]: Passed queue_depth:"
1119                                 " %u exceeds TCM/SE_Device MAX"
1120                                 " TCQ: %u\n", dev, queue_depth,
1121                                 dev->dev_attrib.hw_queue_depth);
1122                         return -EINVAL;
1123                 }
1124         }
1125         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1126         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1127                         dev, queue_depth);
1128         return 0;
1129 }
1130 EXPORT_SYMBOL(se_dev_set_queue_depth);
1131
1132 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1133 {
1134         if (dev->export_count) {
1135                 pr_err("dev[%p]: Unable to change SE Device"
1136                         " optimal_sectors while export_count is %d\n",
1137                         dev, dev->export_count);
1138                 return -EINVAL;
1139         }
1140         if (optimal_sectors > dev->dev_attrib.hw_max_sectors) {
1141                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1142                         " greater than hw_max_sectors: %u\n", dev,
1143                         optimal_sectors, dev->dev_attrib.hw_max_sectors);
1144                 return -EINVAL;
1145         }
1146
1147         dev->dev_attrib.optimal_sectors = optimal_sectors;
1148         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1149                         dev, optimal_sectors);
1150         return 0;
1151 }
1152 EXPORT_SYMBOL(se_dev_set_optimal_sectors);
1153
1154 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1155 {
1156         if (dev->export_count) {
1157                 pr_err("dev[%p]: Unable to change SE Device block_size"
1158                         " while export_count is %d\n",
1159                         dev, dev->export_count);
1160                 return -EINVAL;
1161         }
1162
1163         if ((block_size != 512) &&
1164             (block_size != 1024) &&
1165             (block_size != 2048) &&
1166             (block_size != 4096)) {
1167                 pr_err("dev[%p]: Illegal value for block_device: %u"
1168                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1169                         dev, block_size);
1170                 return -EINVAL;
1171         }
1172
1173         dev->dev_attrib.block_size = block_size;
1174         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1175                         dev, block_size);
1176
1177         if (dev->dev_attrib.max_bytes_per_io)
1178                 dev->dev_attrib.hw_max_sectors =
1179                         dev->dev_attrib.max_bytes_per_io / block_size;
1180
1181         return 0;
1182 }
1183 EXPORT_SYMBOL(se_dev_set_block_size);
1184
1185 struct se_lun *core_dev_add_lun(
1186         struct se_portal_group *tpg,
1187         struct se_device *dev,
1188         u32 unpacked_lun)
1189 {
1190         struct se_lun *lun;
1191         int rc;
1192
1193         lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1194         if (IS_ERR(lun))
1195                 return lun;
1196
1197         rc = core_tpg_add_lun(tpg, lun,
1198                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1199         if (rc < 0)
1200                 return ERR_PTR(rc);
1201
1202         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1203                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1204                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1205                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1206         /*
1207          * Update LUN maps for dynamically added initiators when
1208          * generate_node_acl is enabled.
1209          */
1210         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1211                 struct se_node_acl *acl;
1212                 spin_lock_irq(&tpg->acl_node_lock);
1213                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1214                         if (acl->dynamic_node_acl &&
1215                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1216                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1217                                 spin_unlock_irq(&tpg->acl_node_lock);
1218                                 core_tpg_add_node_to_devs(acl, tpg);
1219                                 spin_lock_irq(&tpg->acl_node_lock);
1220                         }
1221                 }
1222                 spin_unlock_irq(&tpg->acl_node_lock);
1223         }
1224
1225         return lun;
1226 }
1227
1228 /*      core_dev_del_lun():
1229  *
1230  *
1231  */
1232 void core_dev_del_lun(
1233         struct se_portal_group *tpg,
1234         struct se_lun *lun)
1235 {
1236         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivating %s Logical Unit from"
1237                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1238                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1239                 tpg->se_tpg_tfo->get_fabric_name());
1240
1241         core_tpg_remove_lun(tpg, lun);
1242 }
1243
1244 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1245 {
1246         struct se_lun *lun;
1247
1248         spin_lock(&tpg->tpg_lun_lock);
1249         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1250                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1251                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1252                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1253                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1254                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1255                 spin_unlock(&tpg->tpg_lun_lock);
1256                 return NULL;
1257         }
1258         lun = tpg->tpg_lun_list[unpacked_lun];
1259
1260         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1261                 pr_err("%s Logical Unit Number: %u is not free on"
1262                         " Target Portal Group: %hu, ignoring request.\n",
1263                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1264                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1265                 spin_unlock(&tpg->tpg_lun_lock);
1266                 return NULL;
1267         }
1268         spin_unlock(&tpg->tpg_lun_lock);
1269
1270         return lun;
1271 }
1272
1273 /*      core_dev_get_lun():
1274  *
1275  *
1276  */
1277 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1278 {
1279         struct se_lun *lun;
1280
1281         spin_lock(&tpg->tpg_lun_lock);
1282         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1283                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1284                         "_TPG-1: %u for Target Portal Group: %hu\n",
1285                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1286                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1287                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1288                 spin_unlock(&tpg->tpg_lun_lock);
1289                 return NULL;
1290         }
1291         lun = tpg->tpg_lun_list[unpacked_lun];
1292
1293         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1294                 pr_err("%s Logical Unit Number: %u is not active on"
1295                         " Target Portal Group: %hu, ignoring request.\n",
1296                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1297                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1298                 spin_unlock(&tpg->tpg_lun_lock);
1299                 return NULL;
1300         }
1301         spin_unlock(&tpg->tpg_lun_lock);
1302
1303         return lun;
1304 }
1305
1306 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1307         struct se_portal_group *tpg,
1308         struct se_node_acl *nacl,
1309         u32 mapped_lun,
1310         int *ret)
1311 {
1312         struct se_lun_acl *lacl;
1313
1314         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1315                 pr_err("%s InitiatorName exceeds maximum size.\n",
1316                         tpg->se_tpg_tfo->get_fabric_name());
1317                 *ret = -EOVERFLOW;
1318                 return NULL;
1319         }
1320         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1321         if (!lacl) {
1322                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1323                 *ret = -ENOMEM;
1324                 return NULL;
1325         }
1326
1327         INIT_LIST_HEAD(&lacl->lacl_list);
1328         lacl->mapped_lun = mapped_lun;
1329         lacl->se_lun_nacl = nacl;
1330         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1331                  nacl->initiatorname);
1332
1333         return lacl;
1334 }
1335
1336 int core_dev_add_initiator_node_lun_acl(
1337         struct se_portal_group *tpg,
1338         struct se_lun_acl *lacl,
1339         u32 unpacked_lun,
1340         u32 lun_access)
1341 {
1342         struct se_lun *lun;
1343         struct se_node_acl *nacl;
1344
1345         lun = core_dev_get_lun(tpg, unpacked_lun);
1346         if (!lun) {
1347                 pr_err("%s Logical Unit Number: %u is not active on"
1348                         " Target Portal Group: %hu, ignoring request.\n",
1349                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1350                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1351                 return -EINVAL;
1352         }
1353
1354         nacl = lacl->se_lun_nacl;
1355         if (!nacl)
1356                 return -EINVAL;
1357
1358         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1359             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1360                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1361
1362         lacl->se_lun = lun;
1363
1364         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1365                         lun_access, nacl, tpg) < 0)
1366                 return -EINVAL;
1367
1368         spin_lock(&lun->lun_acl_lock);
1369         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1370         atomic_inc_mb(&lun->lun_acl_count);
1371         spin_unlock(&lun->lun_acl_lock);
1372
1373         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1374                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1375                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1376                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1377                 lacl->initiatorname);
1378         /*
1379          * Check to see if there are any existing persistent reservation APTPL
1380          * pre-registrations that need to be enabled for this LUN ACL..
1381          */
1382         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
1383                                             lacl->mapped_lun);
1384         return 0;
1385 }
1386
1387 /*      core_dev_del_initiator_node_lun_acl():
1388  *
1389  *
1390  */
1391 int core_dev_del_initiator_node_lun_acl(
1392         struct se_portal_group *tpg,
1393         struct se_lun *lun,
1394         struct se_lun_acl *lacl)
1395 {
1396         struct se_node_acl *nacl;
1397
1398         nacl = lacl->se_lun_nacl;
1399         if (!nacl)
1400                 return -EINVAL;
1401
1402         spin_lock(&lun->lun_acl_lock);
1403         list_del(&lacl->lacl_list);
1404         atomic_dec_mb(&lun->lun_acl_count);
1405         spin_unlock(&lun->lun_acl_lock);
1406
1407         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1408                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1409
1410         lacl->se_lun = NULL;
1411
1412         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1413                 " InitiatorNode: %s Mapped LUN: %u\n",
1414                 tpg->se_tpg_tfo->get_fabric_name(),
1415                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1416                 lacl->initiatorname, lacl->mapped_lun);
1417
1418         return 0;
1419 }
1420
1421 void core_dev_free_initiator_node_lun_acl(
1422         struct se_portal_group *tpg,
1423         struct se_lun_acl *lacl)
1424 {
1425         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1426                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1427                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1428                 tpg->se_tpg_tfo->get_fabric_name(),
1429                 lacl->initiatorname, lacl->mapped_lun);
1430
1431         kfree(lacl);
1432 }
1433
1434 static void scsi_dump_inquiry(struct se_device *dev)
1435 {
1436         struct t10_wwn *wwn = &dev->t10_wwn;
1437         char buf[17];
1438         int i, device_type;
1439         /*
1440          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1441          */
1442         for (i = 0; i < 8; i++)
1443                 if (wwn->vendor[i] >= 0x20)
1444                         buf[i] = wwn->vendor[i];
1445                 else
1446                         buf[i] = ' ';
1447         buf[i] = '\0';
1448         pr_debug("  Vendor: %s\n", buf);
1449
1450         for (i = 0; i < 16; i++)
1451                 if (wwn->model[i] >= 0x20)
1452                         buf[i] = wwn->model[i];
1453                 else
1454                         buf[i] = ' ';
1455         buf[i] = '\0';
1456         pr_debug("  Model: %s\n", buf);
1457
1458         for (i = 0; i < 4; i++)
1459                 if (wwn->revision[i] >= 0x20)
1460                         buf[i] = wwn->revision[i];
1461                 else
1462                         buf[i] = ' ';
1463         buf[i] = '\0';
1464         pr_debug("  Revision: %s\n", buf);
1465
1466         device_type = dev->transport->get_device_type(dev);
1467         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1468 }
1469
1470 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1471 {
1472         struct se_device *dev;
1473         struct se_lun *xcopy_lun;
1474
1475         dev = hba->transport->alloc_device(hba, name);
1476         if (!dev)
1477                 return NULL;
1478
1479         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1480         dev->se_hba = hba;
1481         dev->transport = hba->transport;
1482         dev->prot_length = sizeof(struct se_dif_v1_tuple);
1483
1484         INIT_LIST_HEAD(&dev->dev_list);
1485         INIT_LIST_HEAD(&dev->dev_sep_list);
1486         INIT_LIST_HEAD(&dev->dev_tmr_list);
1487         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1488         INIT_LIST_HEAD(&dev->state_list);
1489         INIT_LIST_HEAD(&dev->qf_cmd_list);
1490         INIT_LIST_HEAD(&dev->g_dev_node);
1491         spin_lock_init(&dev->execute_task_lock);
1492         spin_lock_init(&dev->delayed_cmd_lock);
1493         spin_lock_init(&dev->dev_reservation_lock);
1494         spin_lock_init(&dev->se_port_lock);
1495         spin_lock_init(&dev->se_tmr_lock);
1496         spin_lock_init(&dev->qf_cmd_lock);
1497         sema_init(&dev->caw_sem, 1);
1498         atomic_set(&dev->dev_ordered_id, 0);
1499         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1500         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1501         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1502         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1503         spin_lock_init(&dev->t10_pr.registration_lock);
1504         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1505         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1506         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1507         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1508         spin_lock_init(&dev->t10_alua.lba_map_lock);
1509
1510         dev->t10_wwn.t10_dev = dev;
1511         dev->t10_alua.t10_dev = dev;
1512
1513         dev->dev_attrib.da_dev = dev;
1514         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1515         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1516         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1517         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1518         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1519         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1520         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1521         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1522         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1523         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1524         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1525         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1526         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1527         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
1528         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1529         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1530         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1531         dev->dev_attrib.max_unmap_block_desc_count =
1532                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1533         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1534         dev->dev_attrib.unmap_granularity_alignment =
1535                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1536         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1537
1538         xcopy_lun = &dev->xcopy_lun;
1539         xcopy_lun->lun_se_dev = dev;
1540         init_completion(&xcopy_lun->lun_shutdown_comp);
1541         INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
1542         spin_lock_init(&xcopy_lun->lun_acl_lock);
1543         spin_lock_init(&xcopy_lun->lun_sep_lock);
1544         init_completion(&xcopy_lun->lun_ref_comp);
1545
1546         return dev;
1547 }
1548
1549 int target_configure_device(struct se_device *dev)
1550 {
1551         struct se_hba *hba = dev->se_hba;
1552         int ret;
1553
1554         if (dev->dev_flags & DF_CONFIGURED) {
1555                 pr_err("se_dev->se_dev_ptr already set for storage"
1556                                 " object\n");
1557                 return -EEXIST;
1558         }
1559
1560         ret = dev->transport->configure_device(dev);
1561         if (ret)
1562                 goto out;
1563         /*
1564          * XXX: there is not much point to have two different values here..
1565          */
1566         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1567         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1568
1569         /*
1570          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1571          */
1572         dev->dev_attrib.hw_max_sectors =
1573                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1574                                          dev->dev_attrib.hw_block_size);
1575         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1576
1577         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1578         dev->creation_time = get_jiffies_64();
1579
1580         ret = core_setup_alua(dev);
1581         if (ret)
1582                 goto out;
1583
1584         /*
1585          * Startup the struct se_device processing thread
1586          */
1587         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1588                                       dev->transport->name);
1589         if (!dev->tmr_wq) {
1590                 pr_err("Unable to create tmr workqueue for %s\n",
1591                         dev->transport->name);
1592                 ret = -ENOMEM;
1593                 goto out_free_alua;
1594         }
1595
1596         /*
1597          * Setup work_queue for QUEUE_FULL
1598          */
1599         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1600
1601         /*
1602          * Preload the initial INQUIRY const values if we are doing
1603          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1604          * passthrough because this is being provided by the backend LLD.
1605          */
1606         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1607                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1608                 strncpy(&dev->t10_wwn.model[0],
1609                         dev->transport->inquiry_prod, 16);
1610                 strncpy(&dev->t10_wwn.revision[0],
1611                         dev->transport->inquiry_rev, 4);
1612         }
1613
1614         scsi_dump_inquiry(dev);
1615
1616         spin_lock(&hba->device_lock);
1617         hba->dev_count++;
1618         spin_unlock(&hba->device_lock);
1619
1620         mutex_lock(&g_device_mutex);
1621         list_add_tail(&dev->g_dev_node, &g_device_list);
1622         mutex_unlock(&g_device_mutex);
1623
1624         dev->dev_flags |= DF_CONFIGURED;
1625
1626         return 0;
1627
1628 out_free_alua:
1629         core_alua_free_lu_gp_mem(dev);
1630 out:
1631         se_release_vpd_for_dev(dev);
1632         return ret;
1633 }
1634
1635 void target_free_device(struct se_device *dev)
1636 {
1637         struct se_hba *hba = dev->se_hba;
1638
1639         WARN_ON(!list_empty(&dev->dev_sep_list));
1640
1641         if (dev->dev_flags & DF_CONFIGURED) {
1642                 destroy_workqueue(dev->tmr_wq);
1643
1644                 mutex_lock(&g_device_mutex);
1645                 list_del(&dev->g_dev_node);
1646                 mutex_unlock(&g_device_mutex);
1647
1648                 spin_lock(&hba->device_lock);
1649                 hba->dev_count--;
1650                 spin_unlock(&hba->device_lock);
1651         }
1652
1653         core_alua_free_lu_gp_mem(dev);
1654         core_alua_set_lba_map(dev, NULL, 0, 0);
1655         core_scsi3_free_all_registrations(dev);
1656         se_release_vpd_for_dev(dev);
1657
1658         if (dev->transport->free_prot)
1659                 dev->transport->free_prot(dev);
1660
1661         dev->transport->free_device(dev);
1662 }
1663
1664 int core_dev_setup_virtual_lun0(void)
1665 {
1666         struct se_hba *hba;
1667         struct se_device *dev;
1668         char buf[] = "rd_pages=8,rd_nullio=1";
1669         int ret;
1670
1671         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1672         if (IS_ERR(hba))
1673                 return PTR_ERR(hba);
1674
1675         dev = target_alloc_device(hba, "virt_lun0");
1676         if (!dev) {
1677                 ret = -ENOMEM;
1678                 goto out_free_hba;
1679         }
1680
1681         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1682
1683         ret = target_configure_device(dev);
1684         if (ret)
1685                 goto out_free_se_dev;
1686
1687         lun0_hba = hba;
1688         g_lun0_dev = dev;
1689         return 0;
1690
1691 out_free_se_dev:
1692         target_free_device(dev);
1693 out_free_hba:
1694         core_delete_hba(hba);
1695         return ret;
1696 }
1697
1698
1699 void core_dev_release_virtual_lun0(void)
1700 {
1701         struct se_hba *hba = lun0_hba;
1702
1703         if (!hba)
1704                 return;
1705
1706         if (g_lun0_dev)
1707                 target_free_device(g_lun0_dev);
1708         core_delete_hba(hba);
1709 }