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 int se_dev_set_max_unmap_lba_count(
 654         struct se_device *dev,
 655         u32 max_unmap_lba_count)
 656 {
 657         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 658         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 659                         dev, dev->dev_attrib.max_unmap_lba_count);
 660         return 0;
 661 }
 662 EXPORT_SYMBOL(se_dev_set_max_unmap_lba_count);
 663
 664 int se_dev_set_max_unmap_block_desc_count(
 665         struct se_device *dev,
 666         u32 max_unmap_block_desc_count)
 667 {
 668         dev->dev_attrib.max_unmap_block_desc_count =
 669                 max_unmap_block_desc_count;
 670         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 671                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 672         return 0;
 673 }
 674 EXPORT_SYMBOL(se_dev_set_max_unmap_block_desc_count);
 675
 676 int se_dev_set_unmap_granularity(
 677         struct se_device *dev,
 678         u32 unmap_granularity)
 679 {
 680         dev->dev_attrib.unmap_granularity = unmap_granularity;
 681         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 682                         dev, dev->dev_attrib.unmap_granularity);
 683         return 0;
 684 }
 685 EXPORT_SYMBOL(se_dev_set_unmap_granularity);
 686
 687 int se_dev_set_unmap_granularity_alignment(
 688         struct se_device *dev,
 689         u32 unmap_granularity_alignment)
 690 {
 691         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 692         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 693                         dev, dev->dev_attrib.unmap_granularity_alignment);
 694         return 0;
 695 }
 696 EXPORT_SYMBOL(se_dev_set_unmap_granularity_alignment);
 697
 698 int se_dev_set_max_write_same_len(
 699         struct se_device *dev,
 700         u32 max_write_same_len)
 701 {
 702         dev->dev_attrib.max_write_same_len = max_write_same_len;
 703         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 704                         dev, dev->dev_attrib.max_write_same_len);
 705         return 0;
 706 }
 707 EXPORT_SYMBOL(se_dev_set_max_write_same_len);
 708
 709 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 710 {
 711         const char *configname;
 712
 713         configname = config_item_name(&dev->dev_group.cg_item);
 714         if (strlen(configname) >= 16) {
 715                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 716                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 717                         configname);
 718         }
 719         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 720 }
 721
 722 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 723 {
 724         if (dev->export_count) {
 725                 pr_err("dev[%p]: Unable to change model alias"
 726                         " while export_count is %d\n",
 727                         dev, dev->export_count);
 728                         return -EINVAL;
 729         }
 730
 731         if (flag != 0 && flag != 1) {
 732                 pr_err("Illegal value %d\n", flag);
 733                 return -EINVAL;
 734         }
 735
 736         if (flag) {
 737                 dev_set_t10_wwn_model_alias(dev);
 738         } else {
 739                 strncpy(&dev->t10_wwn.model[0],
 740                         dev->transport->inquiry_prod, 16);
 741         }
 742         dev->dev_attrib.emulate_model_alias = flag;
 743
 744         return 0;
 745 }
 746 EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
 747
 748 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 749 {
 750         if (flag != 0 && flag != 1) {
 751                 pr_err("Illegal value %d\n", flag);
 752                 return -EINVAL;
 753         }
 754
 755         if (flag) {
 756                 pr_err("dpo_emulated not supported\n");
 757                 return -EINVAL;
 758         }
 759
 760         return 0;
 761 }
 762 EXPORT_SYMBOL(se_dev_set_emulate_dpo);
 763
 764 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 765 {
 766         if (flag != 0 && flag != 1) {
 767                 pr_err("Illegal value %d\n", flag);
 768                 return -EINVAL;
 769         }
 770         dev->dev_attrib.emulate_fua_write = flag;
 771         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 772                         dev, dev->dev_attrib.emulate_fua_write);
 773         return 0;
 774 }
 775 EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
 776
 777 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 778 {
 779         if (flag != 0 && flag != 1) {
 780                 pr_err("Illegal value %d\n", flag);
 781                 return -EINVAL;
 782         }
 783
 784         if (flag) {
 785                 pr_err("ua read emulated not supported\n");
 786                 return -EINVAL;
 787         }
 788
 789         return 0;
 790 }
 791 EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
 792
 793 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 794 {
 795         if (flag != 0 && flag != 1) {
 796                 pr_err("Illegal value %d\n", flag);
 797                 return -EINVAL;
 798         }
 799         if (flag &&
 800             dev->transport->get_write_cache) {
 801                 pr_err("emulate_write_cache not supported for this device\n");
 802                 return -EINVAL;
 803         }
 804
 805         dev->dev_attrib.emulate_write_cache = flag;
 806         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 807                         dev, dev->dev_attrib.emulate_write_cache);
 808         return 0;
 809 }
 810 EXPORT_SYMBOL(se_dev_set_emulate_write_cache);
 811
 812 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 813 {
 814         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 815                 pr_err("Illegal value %d\n", flag);
 816                 return -EINVAL;
 817         }
 818
 819         if (dev->export_count) {
 820                 pr_err("dev[%p]: Unable to change SE Device"
 821                         " UA_INTRLCK_CTRL while export_count is %d\n",
 822                         dev, dev->export_count);
 823                 return -EINVAL;
 824         }
 825         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 826         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 827                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 828
 829         return 0;
 830 }
 831 EXPORT_SYMBOL(se_dev_set_emulate_ua_intlck_ctrl);
 832
 833 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 834 {
 835         if ((flag != 0) && (flag != 1)) {
 836                 pr_err("Illegal value %d\n", flag);
 837                 return -EINVAL;
 838         }
 839
 840         if (dev->export_count) {
 841                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 842                         " export_count is %d\n",
 843                         dev, dev->export_count);
 844                 return -EINVAL;
 845         }
 846         dev->dev_attrib.emulate_tas = flag;
 847         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 848                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 849
 850         return 0;
 851 }
 852 EXPORT_SYMBOL(se_dev_set_emulate_tas);
 853
 854 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 855 {
 856         if ((flag != 0) && (flag != 1)) {
 857                 pr_err("Illegal value %d\n", flag);
 858                 return -EINVAL;
 859         }
 860         /*
 861          * We expect this value to be non-zero when generic Block Layer
 862          * Discard supported is detected iblock_create_virtdevice().
 863          */
 864         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 865                 pr_err("Generic Block Discard not supported\n");
 866                 return -ENOSYS;
 867         }
 868
 869         dev->dev_attrib.emulate_tpu = flag;
 870         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 871                                 dev, flag);
 872         return 0;
 873 }
 874 EXPORT_SYMBOL(se_dev_set_emulate_tpu);
 875
 876 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 877 {
 878         if ((flag != 0) && (flag != 1)) {
 879                 pr_err("Illegal value %d\n", flag);
 880                 return -EINVAL;
 881         }
 882         /*
 883          * We expect this value to be non-zero when generic Block Layer
 884          * Discard supported is detected iblock_create_virtdevice().
 885          */
 886         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 887                 pr_err("Generic Block Discard not supported\n");
 888                 return -ENOSYS;
 889         }
 890
 891         dev->dev_attrib.emulate_tpws = flag;
 892         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 893                                 dev, flag);
 894         return 0;
 895 }
 896 EXPORT_SYMBOL(se_dev_set_emulate_tpws);
 897
 898 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
 899 {
 900         if (flag != 0 && flag != 1) {
 901                 pr_err("Illegal value %d\n", flag);
 902                 return -EINVAL;
 903         }
 904         dev->dev_attrib.emulate_caw = flag;
 905         pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
 906                  dev, flag);
 907
 908         return 0;
 909 }
 910 EXPORT_SYMBOL(se_dev_set_emulate_caw);
 911
 912 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
 913 {
 914         if (flag != 0 && flag != 1) {
 915                 pr_err("Illegal value %d\n", flag);
 916                 return -EINVAL;
 917         }
 918         dev->dev_attrib.emulate_3pc = flag;
 919         pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
 920                 dev, flag);
 921
 922         return 0;
 923 }
 924 EXPORT_SYMBOL(se_dev_set_emulate_3pc);
 925
 926 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
 927 {
 928         int rc, old_prot = dev->dev_attrib.pi_prot_type;
 929
 930         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
 931                 pr_err("Illegal value %d for pi_prot_type\n", flag);
 932                 return -EINVAL;
 933         }
 934         if (flag == 2) {
 935                 pr_err("DIF TYPE2 protection currently not supported\n");
 936                 return -ENOSYS;
 937         }
 938         if (dev->dev_attrib.hw_pi_prot_type) {
 939                 pr_warn("DIF protection enabled on underlying hardware,"
 940                         " ignoring\n");
 941                 return 0;
 942         }
 943         if (!dev->transport->init_prot || !dev->transport->free_prot) {
 944                 /* 0 is only allowed value for non-supporting backends */
 945                 if (flag == 0)
 946                         return 0;
 947
 948                 pr_err("DIF protection not supported by backend: %s\n",
 949                        dev->transport->name);
 950                 return -ENOSYS;
 951         }
 952         if (!(dev->dev_flags & DF_CONFIGURED)) {
 953                 pr_err("DIF protection requires device to be configured\n");
 954                 return -ENODEV;
 955         }
 956         if (dev->export_count) {
 957                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
 958                        " export_count is %d\n", dev, dev->export_count);
 959                 return -EINVAL;
 960         }
 961
 962         dev->dev_attrib.pi_prot_type = flag;
 963
 964         if (flag && !old_prot) {
 965                 rc = dev->transport->init_prot(dev);
 966                 if (rc) {
 967                         dev->dev_attrib.pi_prot_type = old_prot;
 968                         return rc;
 969                 }
 970
 971         } else if (!flag && old_prot) {
 972                 dev->transport->free_prot(dev);
 973         }
 974         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
 975
 976         return 0;
 977 }
 978 EXPORT_SYMBOL(se_dev_set_pi_prot_type);
 979
 980 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
 981 {
 982         int rc;
 983
 984         if (!flag)
 985                 return 0;
 986
 987         if (flag != 1) {
 988                 pr_err("Illegal value %d for pi_prot_format\n", flag);
 989                 return -EINVAL;
 990         }
 991         if (!dev->transport->format_prot) {
 992                 pr_err("DIF protection format not supported by backend %s\n",
 993                        dev->transport->name);
 994                 return -ENOSYS;
 995         }
 996         if (!(dev->dev_flags & DF_CONFIGURED)) {
 997                 pr_err("DIF protection format requires device to be configured\n");
 998                 return -ENODEV;
 999         }
1000         if (dev->export_count) {
1001                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
1002                        " export_count is %d\n", dev, dev->export_count);
1003                 return -EINVAL;
1004         }
1005
1006         rc = dev->transport->format_prot(dev);
1007         if (rc)
1008                 return rc;
1009
1010         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1011
1012         return 0;
1013 }
1014 EXPORT_SYMBOL(se_dev_set_pi_prot_format);
1015
1016 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1017 {
1018         if ((flag != 0) && (flag != 1)) {
1019                 pr_err("Illegal value %d\n", flag);
1020                 return -EINVAL;
1021         }
1022         dev->dev_attrib.enforce_pr_isids = flag;
1023         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1024                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1025         return 0;
1026 }
1027 EXPORT_SYMBOL(se_dev_set_enforce_pr_isids);
1028
1029 int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
1030 {
1031         if ((flag != 0) && (flag != 1)) {
1032                 printk(KERN_ERR "Illegal value %d\n", flag);
1033                 return -EINVAL;
1034         }
1035         if (dev->export_count) {
1036                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
1037                        " export_count is %d\n", dev, dev->export_count);
1038                 return -EINVAL;
1039         }
1040
1041         dev->dev_attrib.force_pr_aptpl = flag;
1042         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
1043         return 0;
1044 }
1045 EXPORT_SYMBOL(se_dev_set_force_pr_aptpl);
1046
1047 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1048 {
1049         if ((flag != 0) && (flag != 1)) {
1050                 printk(KERN_ERR "Illegal value %d\n", flag);
1051                 return -EINVAL;
1052         }
1053         dev->dev_attrib.is_nonrot = flag;
1054         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1055                dev, flag);
1056         return 0;
1057 }
1058 EXPORT_SYMBOL(se_dev_set_is_nonrot);
1059
1060 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1061 {
1062         if (flag != 0) {
1063                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1064                         " reordering not implemented\n", dev);
1065                 return -ENOSYS;
1066         }
1067         dev->dev_attrib.emulate_rest_reord = flag;
1068         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1069         return 0;
1070 }
1071 EXPORT_SYMBOL(se_dev_set_emulate_rest_reord);
1072
1073 /*
1074  * Note, this can only be called on unexported SE Device Object.
1075  */
1076 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1077 {
1078         if (dev->export_count) {
1079                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1080                         " export_count is %d\n",
1081                         dev, dev->export_count);
1082                 return -EINVAL;
1083         }
1084         if (!queue_depth) {
1085                 pr_err("dev[%p]: Illegal ZERO value for queue"
1086                         "_depth\n", dev);
1087                 return -EINVAL;
1088         }
1089
1090         if (queue_depth > dev->dev_attrib.queue_depth) {
1091                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1092                         pr_err("dev[%p]: Passed queue_depth:"
1093                                 " %u exceeds TCM/SE_Device MAX"
1094                                 " TCQ: %u\n", dev, queue_depth,
1095                                 dev->dev_attrib.hw_queue_depth);
1096                         return -EINVAL;
1097                 }
1098         }
1099         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1100         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1101                         dev, queue_depth);
1102         return 0;
1103 }
1104 EXPORT_SYMBOL(se_dev_set_queue_depth);
1105
1106 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1107 {
1108         int block_size = dev->dev_attrib.block_size;
1109
1110         if (dev->export_count) {
1111                 pr_err("dev[%p]: Unable to change SE Device"
1112                         " fabric_max_sectors while export_count is %d\n",
1113                         dev, dev->export_count);
1114                 return -EINVAL;
1115         }
1116         if (!fabric_max_sectors) {
1117                 pr_err("dev[%p]: Illegal ZERO value for"
1118                         " fabric_max_sectors\n", dev);
1119                 return -EINVAL;
1120         }
1121         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1122                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1123                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1124                                 DA_STATUS_MAX_SECTORS_MIN);
1125                 return -EINVAL;
1126         }
1127         if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1128                 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1129                         " greater than DA_STATUS_MAX_SECTORS_MAX:"
1130                         " %u\n", dev, fabric_max_sectors,
1131                         DA_STATUS_MAX_SECTORS_MAX);
1132                 return -EINVAL;
1133         }
1134         /*
1135          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1136          */
1137         if (!block_size) {
1138                 block_size = 512;
1139                 pr_warn("Defaulting to 512 for zero block_size\n");
1140         }
1141         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1142                                                       block_size);
1143
1144         dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1145         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1146                         dev, fabric_max_sectors);
1147         return 0;
1148 }
1149 EXPORT_SYMBOL(se_dev_set_fabric_max_sectors);
1150
1151 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1152 {
1153         if (dev->export_count) {
1154                 pr_err("dev[%p]: Unable to change SE Device"
1155                         " optimal_sectors while export_count is %d\n",
1156                         dev, dev->export_count);
1157                 return -EINVAL;
1158         }
1159         if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1160                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1161                         " greater than fabric_max_sectors: %u\n", dev,
1162                         optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1163                 return -EINVAL;
1164         }
1165
1166         dev->dev_attrib.optimal_sectors = optimal_sectors;
1167         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1168                         dev, optimal_sectors);
1169         return 0;
1170 }
1171 EXPORT_SYMBOL(se_dev_set_optimal_sectors);
1172
1173 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1174 {
1175         if (dev->export_count) {
1176                 pr_err("dev[%p]: Unable to change SE Device block_size"
1177                         " while export_count is %d\n",
1178                         dev, dev->export_count);
1179                 return -EINVAL;
1180         }
1181
1182         if ((block_size != 512) &&
1183             (block_size != 1024) &&
1184             (block_size != 2048) &&
1185             (block_size != 4096)) {
1186                 pr_err("dev[%p]: Illegal value for block_device: %u"
1187                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1188                         dev, block_size);
1189                 return -EINVAL;
1190         }
1191
1192         dev->dev_attrib.block_size = block_size;
1193         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1194                         dev, block_size);
1195
1196         if (dev->dev_attrib.max_bytes_per_io)
1197                 dev->dev_attrib.hw_max_sectors =
1198                         dev->dev_attrib.max_bytes_per_io / block_size;
1199
1200         return 0;
1201 }
1202 EXPORT_SYMBOL(se_dev_set_block_size);
1203
1204 struct se_lun *core_dev_add_lun(
1205         struct se_portal_group *tpg,
1206         struct se_device *dev,
1207         u32 unpacked_lun)
1208 {
1209         struct se_lun *lun;
1210         int rc;
1211
1212         lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1213         if (IS_ERR(lun))
1214                 return lun;
1215
1216         rc = core_tpg_add_lun(tpg, lun,
1217                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1218         if (rc < 0)
1219                 return ERR_PTR(rc);
1220
1221         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1222                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1223                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1224                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1225         /*
1226          * Update LUN maps for dynamically added initiators when
1227          * generate_node_acl is enabled.
1228          */
1229         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1230                 struct se_node_acl *acl;
1231                 spin_lock_irq(&tpg->acl_node_lock);
1232                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1233                         if (acl->dynamic_node_acl &&
1234                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1235                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1236                                 spin_unlock_irq(&tpg->acl_node_lock);
1237                                 core_tpg_add_node_to_devs(acl, tpg);
1238                                 spin_lock_irq(&tpg->acl_node_lock);
1239                         }
1240                 }
1241                 spin_unlock_irq(&tpg->acl_node_lock);
1242         }
1243
1244         return lun;
1245 }
1246
1247 /*      core_dev_del_lun():
1248  *
1249  *
1250  */
1251 void core_dev_del_lun(
1252         struct se_portal_group *tpg,
1253         struct se_lun *lun)
1254 {
1255         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivating %s Logical Unit from"
1256                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1257                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1258                 tpg->se_tpg_tfo->get_fabric_name());
1259
1260         core_tpg_remove_lun(tpg, lun);
1261 }
1262
1263 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1264 {
1265         struct se_lun *lun;
1266
1267         spin_lock(&tpg->tpg_lun_lock);
1268         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1269                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1270                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1271                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1272                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1273                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1274                 spin_unlock(&tpg->tpg_lun_lock);
1275                 return NULL;
1276         }
1277         lun = tpg->tpg_lun_list[unpacked_lun];
1278
1279         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1280                 pr_err("%s Logical Unit Number: %u is not free on"
1281                         " Target Portal Group: %hu, ignoring request.\n",
1282                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1283                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1284                 spin_unlock(&tpg->tpg_lun_lock);
1285                 return NULL;
1286         }
1287         spin_unlock(&tpg->tpg_lun_lock);
1288
1289         return lun;
1290 }
1291
1292 /*      core_dev_get_lun():
1293  *
1294  *
1295  */
1296 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1297 {
1298         struct se_lun *lun;
1299
1300         spin_lock(&tpg->tpg_lun_lock);
1301         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1302                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1303                         "_TPG-1: %u for Target Portal Group: %hu\n",
1304                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1305                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1306                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1307                 spin_unlock(&tpg->tpg_lun_lock);
1308                 return NULL;
1309         }
1310         lun = tpg->tpg_lun_list[unpacked_lun];
1311
1312         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1313                 pr_err("%s Logical Unit Number: %u is not active on"
1314                         " Target Portal Group: %hu, ignoring request.\n",
1315                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1316                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1317                 spin_unlock(&tpg->tpg_lun_lock);
1318                 return NULL;
1319         }
1320         spin_unlock(&tpg->tpg_lun_lock);
1321
1322         return lun;
1323 }
1324
1325 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1326         struct se_portal_group *tpg,
1327         struct se_node_acl *nacl,
1328         u32 mapped_lun,
1329         int *ret)
1330 {
1331         struct se_lun_acl *lacl;
1332
1333         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1334                 pr_err("%s InitiatorName exceeds maximum size.\n",
1335                         tpg->se_tpg_tfo->get_fabric_name());
1336                 *ret = -EOVERFLOW;
1337                 return NULL;
1338         }
1339         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1340         if (!lacl) {
1341                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1342                 *ret = -ENOMEM;
1343                 return NULL;
1344         }
1345
1346         INIT_LIST_HEAD(&lacl->lacl_list);
1347         lacl->mapped_lun = mapped_lun;
1348         lacl->se_lun_nacl = nacl;
1349         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1350                  nacl->initiatorname);
1351
1352         return lacl;
1353 }
1354
1355 int core_dev_add_initiator_node_lun_acl(
1356         struct se_portal_group *tpg,
1357         struct se_lun_acl *lacl,
1358         u32 unpacked_lun,
1359         u32 lun_access)
1360 {
1361         struct se_lun *lun;
1362         struct se_node_acl *nacl;
1363
1364         lun = core_dev_get_lun(tpg, unpacked_lun);
1365         if (!lun) {
1366                 pr_err("%s Logical Unit Number: %u is not active on"
1367                         " Target Portal Group: %hu, ignoring request.\n",
1368                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1369                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1370                 return -EINVAL;
1371         }
1372
1373         nacl = lacl->se_lun_nacl;
1374         if (!nacl)
1375                 return -EINVAL;
1376
1377         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1378             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1379                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1380
1381         lacl->se_lun = lun;
1382
1383         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1384                         lun_access, nacl, tpg) < 0)
1385                 return -EINVAL;
1386
1387         spin_lock(&lun->lun_acl_lock);
1388         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1389         atomic_inc_mb(&lun->lun_acl_count);
1390         spin_unlock(&lun->lun_acl_lock);
1391
1392         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1393                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1394                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1395                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1396                 lacl->initiatorname);
1397         /*
1398          * Check to see if there are any existing persistent reservation APTPL
1399          * pre-registrations that need to be enabled for this LUN ACL..
1400          */
1401         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
1402                                             lacl->mapped_lun);
1403         return 0;
1404 }
1405
1406 /*      core_dev_del_initiator_node_lun_acl():
1407  *
1408  *
1409  */
1410 int core_dev_del_initiator_node_lun_acl(
1411         struct se_portal_group *tpg,
1412         struct se_lun *lun,
1413         struct se_lun_acl *lacl)
1414 {
1415         struct se_node_acl *nacl;
1416
1417         nacl = lacl->se_lun_nacl;
1418         if (!nacl)
1419                 return -EINVAL;
1420
1421         spin_lock(&lun->lun_acl_lock);
1422         list_del(&lacl->lacl_list);
1423         atomic_dec_mb(&lun->lun_acl_count);
1424         spin_unlock(&lun->lun_acl_lock);
1425
1426         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1427                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1428
1429         lacl->se_lun = NULL;
1430
1431         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1432                 " InitiatorNode: %s Mapped LUN: %u\n",
1433                 tpg->se_tpg_tfo->get_fabric_name(),
1434                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1435                 lacl->initiatorname, lacl->mapped_lun);
1436
1437         return 0;
1438 }
1439
1440 void core_dev_free_initiator_node_lun_acl(
1441         struct se_portal_group *tpg,
1442         struct se_lun_acl *lacl)
1443 {
1444         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1445                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1446                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1447                 tpg->se_tpg_tfo->get_fabric_name(),
1448                 lacl->initiatorname, lacl->mapped_lun);
1449
1450         kfree(lacl);
1451 }
1452
1453 static void scsi_dump_inquiry(struct se_device *dev)
1454 {
1455         struct t10_wwn *wwn = &dev->t10_wwn;
1456         char buf[17];
1457         int i, device_type;
1458         /*
1459          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1460          */
1461         for (i = 0; i < 8; i++)
1462                 if (wwn->vendor[i] >= 0x20)
1463                         buf[i] = wwn->vendor[i];
1464                 else
1465                         buf[i] = ' ';
1466         buf[i] = '\0';
1467         pr_debug("  Vendor: %s\n", buf);
1468
1469         for (i = 0; i < 16; i++)
1470                 if (wwn->model[i] >= 0x20)
1471                         buf[i] = wwn->model[i];
1472                 else
1473                         buf[i] = ' ';
1474         buf[i] = '\0';
1475         pr_debug("  Model: %s\n", buf);
1476
1477         for (i = 0; i < 4; i++)
1478                 if (wwn->revision[i] >= 0x20)
1479                         buf[i] = wwn->revision[i];
1480                 else
1481                         buf[i] = ' ';
1482         buf[i] = '\0';
1483         pr_debug("  Revision: %s\n", buf);
1484
1485         device_type = dev->transport->get_device_type(dev);
1486         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1487 }
1488
1489 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1490 {
1491         struct se_device *dev;
1492         struct se_lun *xcopy_lun;
1493
1494         dev = hba->transport->alloc_device(hba, name);
1495         if (!dev)
1496                 return NULL;
1497
1498         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1499         dev->se_hba = hba;
1500         dev->transport = hba->transport;
1501         dev->prot_length = sizeof(struct se_dif_v1_tuple);
1502
1503         INIT_LIST_HEAD(&dev->dev_list);
1504         INIT_LIST_HEAD(&dev->dev_sep_list);
1505         INIT_LIST_HEAD(&dev->dev_tmr_list);
1506         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1507         INIT_LIST_HEAD(&dev->state_list);
1508         INIT_LIST_HEAD(&dev->qf_cmd_list);
1509         INIT_LIST_HEAD(&dev->g_dev_node);
1510         spin_lock_init(&dev->execute_task_lock);
1511         spin_lock_init(&dev->delayed_cmd_lock);
1512         spin_lock_init(&dev->dev_reservation_lock);
1513         spin_lock_init(&dev->se_port_lock);
1514         spin_lock_init(&dev->se_tmr_lock);
1515         spin_lock_init(&dev->qf_cmd_lock);
1516         sema_init(&dev->caw_sem, 1);
1517         atomic_set(&dev->dev_ordered_id, 0);
1518         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1519         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1520         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1521         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1522         spin_lock_init(&dev->t10_pr.registration_lock);
1523         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1524         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1525         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1526         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1527         spin_lock_init(&dev->t10_alua.lba_map_lock);
1528
1529         dev->t10_wwn.t10_dev = dev;
1530         dev->t10_alua.t10_dev = dev;
1531
1532         dev->dev_attrib.da_dev = dev;
1533         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1534         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1535         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1536         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1537         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1538         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1539         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1540         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1541         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1542         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1543         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1544         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1545         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1546         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
1547         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1548         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1549         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1550         dev->dev_attrib.max_unmap_block_desc_count =
1551                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1552         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1553         dev->dev_attrib.unmap_granularity_alignment =
1554                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1555         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1556         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1557         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1558
1559         xcopy_lun = &dev->xcopy_lun;
1560         xcopy_lun->lun_se_dev = dev;
1561         init_completion(&xcopy_lun->lun_shutdown_comp);
1562         INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
1563         spin_lock_init(&xcopy_lun->lun_acl_lock);
1564         spin_lock_init(&xcopy_lun->lun_sep_lock);
1565         init_completion(&xcopy_lun->lun_ref_comp);
1566
1567         return dev;
1568 }
1569
1570 int target_configure_device(struct se_device *dev)
1571 {
1572         struct se_hba *hba = dev->se_hba;
1573         int ret;
1574
1575         if (dev->dev_flags & DF_CONFIGURED) {
1576                 pr_err("se_dev->se_dev_ptr already set for storage"
1577                                 " object\n");
1578                 return -EEXIST;
1579         }
1580
1581         ret = dev->transport->configure_device(dev);
1582         if (ret)
1583                 goto out;
1584         dev->dev_flags |= DF_CONFIGURED;
1585
1586         /*
1587          * XXX: there is not much point to have two different values here..
1588          */
1589         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1590         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1591
1592         /*
1593          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1594          */
1595         dev->dev_attrib.hw_max_sectors =
1596                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1597                                          dev->dev_attrib.hw_block_size);
1598
1599         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1600         dev->creation_time = get_jiffies_64();
1601
1602         ret = core_setup_alua(dev);
1603         if (ret)
1604                 goto out;
1605
1606         /*
1607          * Startup the struct se_device processing thread
1608          */
1609         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1610                                       dev->transport->name);
1611         if (!dev->tmr_wq) {
1612                 pr_err("Unable to create tmr workqueue for %s\n",
1613                         dev->transport->name);
1614                 ret = -ENOMEM;
1615                 goto out_free_alua;
1616         }
1617
1618         /*
1619          * Setup work_queue for QUEUE_FULL
1620          */
1621         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1622
1623         /*
1624          * Preload the initial INQUIRY const values if we are doing
1625          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1626          * passthrough because this is being provided by the backend LLD.
1627          */
1628         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1629                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1630                 strncpy(&dev->t10_wwn.model[0],
1631                         dev->transport->inquiry_prod, 16);
1632                 strncpy(&dev->t10_wwn.revision[0],
1633                         dev->transport->inquiry_rev, 4);
1634         }
1635
1636         scsi_dump_inquiry(dev);
1637
1638         spin_lock(&hba->device_lock);
1639         hba->dev_count++;
1640         spin_unlock(&hba->device_lock);
1641
1642         mutex_lock(&g_device_mutex);
1643         list_add_tail(&dev->g_dev_node, &g_device_list);
1644         mutex_unlock(&g_device_mutex);
1645
1646         return 0;
1647
1648 out_free_alua:
1649         core_alua_free_lu_gp_mem(dev);
1650 out:
1651         se_release_vpd_for_dev(dev);
1652         return ret;
1653 }
1654
1655 void target_free_device(struct se_device *dev)
1656 {
1657         struct se_hba *hba = dev->se_hba;
1658
1659         WARN_ON(!list_empty(&dev->dev_sep_list));
1660
1661         if (dev->dev_flags & DF_CONFIGURED) {
1662                 destroy_workqueue(dev->tmr_wq);
1663
1664                 mutex_lock(&g_device_mutex);
1665                 list_del(&dev->g_dev_node);
1666                 mutex_unlock(&g_device_mutex);
1667
1668                 spin_lock(&hba->device_lock);
1669                 hba->dev_count--;
1670                 spin_unlock(&hba->device_lock);
1671         }
1672
1673         core_alua_free_lu_gp_mem(dev);
1674         core_alua_set_lba_map(dev, NULL, 0, 0);
1675         core_scsi3_free_all_registrations(dev);
1676         se_release_vpd_for_dev(dev);
1677
1678         if (dev->transport->free_prot)
1679                 dev->transport->free_prot(dev);
1680
1681         dev->transport->free_device(dev);
1682 }
1683
1684 int core_dev_setup_virtual_lun0(void)
1685 {
1686         struct se_hba *hba;
1687         struct se_device *dev;
1688         char buf[] = "rd_pages=8,rd_nullio=1";
1689         int ret;
1690
1691         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1692         if (IS_ERR(hba))
1693                 return PTR_ERR(hba);
1694
1695         dev = target_alloc_device(hba, "virt_lun0");
1696         if (!dev) {
1697                 ret = -ENOMEM;
1698                 goto out_free_hba;
1699         }
1700
1701         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1702
1703         ret = target_configure_device(dev);
1704         if (ret)
1705                 goto out_free_se_dev;
1706
1707         lun0_hba = hba;
1708         g_lun0_dev = dev;
1709         return 0;
1710
1711 out_free_se_dev:
1712         target_free_device(dev);
1713 out_free_hba:
1714         core_delete_hba(hba);
1715         return ret;
1716 }
1717
1718
1719 void core_dev_release_virtual_lun0(void)
1720 {
1721         struct se_hba *hba = lun0_hba;
1722
1723         if (!hba)
1724                 return;
1725
1726         if (g_lun0_dev)
1727                 target_free_device(g_lun0_dev);
1728         core_delete_hba(hba);
1729 }