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