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 2003-2012 RisingTide Systems LLC.
   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 static struct se_hba *lun0_hba;
  51 /* not static, needed by tpg.c */
  52 struct se_device *g_lun0_dev;
  53
  54 sense_reason_t
  55 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  56 {
  57         struct se_lun *se_lun = NULL;
  58         struct se_session *se_sess = se_cmd->se_sess;
  59         struct se_device *dev;
  60         unsigned long flags;
  61
  62         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
  63                 return TCM_NON_EXISTENT_LUN;
  64
  65         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  66         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  67         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  68                 struct se_dev_entry *deve = se_cmd->se_deve;
  69
  70                 deve->total_cmds++;
  71
  72                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  73                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  74                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  75                                 " Access for 0x%08x\n",
  76                                 se_cmd->se_tfo->get_fabric_name(),
  77                                 unpacked_lun);
  78                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  79                         return TCM_WRITE_PROTECTED;
  80                 }
  81
  82                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  83                         deve->write_bytes += se_cmd->data_length;
  84                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  85                         deve->read_bytes += se_cmd->data_length;
  86
  87                 se_lun = deve->se_lun;
  88                 se_cmd->se_lun = deve->se_lun;
  89                 se_cmd->pr_res_key = deve->pr_res_key;
  90                 se_cmd->orig_fe_lun = unpacked_lun;
  91                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  92         }
  93         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  94
  95         if (!se_lun) {
  96                 /*
  97                  * Use the se_portal_group->tpg_virt_lun0 to allow for
  98                  * REPORT_LUNS, et al to be returned when no active
  99                  * MappedLUN=0 exists for this Initiator Port.
 100                  */
 101                 if (unpacked_lun != 0) {
 102                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 103                                 " Access for 0x%08x\n",
 104                                 se_cmd->se_tfo->get_fabric_name(),
 105                                 unpacked_lun);
 106                         return TCM_NON_EXISTENT_LUN;
 107                 }
 108                 /*
 109                  * Force WRITE PROTECT for virtual LUN 0
 110                  */
 111                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 112                     (se_cmd->data_direction != DMA_NONE))
 113                         return TCM_WRITE_PROTECTED;
 114
 115                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 116                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 117                 se_cmd->orig_fe_lun = 0;
 118                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 119         }
 120
 121         /* Directly associate cmd with se_dev */
 122         se_cmd->se_dev = se_lun->lun_se_dev;
 123
 124         /* TODO: get rid of this and use atomics for stats */
 125         dev = se_lun->lun_se_dev;
 126         spin_lock_irqsave(&dev->stats_lock, flags);
 127         dev->num_cmds++;
 128         if (se_cmd->data_direction == DMA_TO_DEVICE)
 129                 dev->write_bytes += se_cmd->data_length;
 130         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 131                 dev->read_bytes += se_cmd->data_length;
 132         spin_unlock_irqrestore(&dev->stats_lock, flags);
 133
 134         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 135         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 136         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 137
 138         return 0;
 139 }
 140 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 141
 142 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 143 {
 144         struct se_dev_entry *deve;
 145         struct se_lun *se_lun = NULL;
 146         struct se_session *se_sess = se_cmd->se_sess;
 147         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 148         unsigned long flags;
 149
 150         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
 151                 return -ENODEV;
 152
 153         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 154         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 155         deve = se_cmd->se_deve;
 156
 157         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 158                 se_tmr->tmr_lun = deve->se_lun;
 159                 se_cmd->se_lun = deve->se_lun;
 160                 se_lun = deve->se_lun;
 161                 se_cmd->pr_res_key = deve->pr_res_key;
 162                 se_cmd->orig_fe_lun = unpacked_lun;
 163         }
 164         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 165
 166         if (!se_lun) {
 167                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 168                         " Access for 0x%08x\n",
 169                         se_cmd->se_tfo->get_fabric_name(),
 170                         unpacked_lun);
 171                 return -ENODEV;
 172         }
 173
 174         /* Directly associate cmd with se_dev */
 175         se_cmd->se_dev = se_lun->lun_se_dev;
 176         se_tmr->tmr_dev = se_lun->lun_se_dev;
 177
 178         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 179         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 180         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 181
 182         return 0;
 183 }
 184 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 185
 186 /*
 187  * This function is called from core_scsi3_emulate_pro_register_and_move()
 188  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 189  * when a matching rtpi is found.
 190  */
 191 struct se_dev_entry *core_get_se_deve_from_rtpi(
 192         struct se_node_acl *nacl,
 193         u16 rtpi)
 194 {
 195         struct se_dev_entry *deve;
 196         struct se_lun *lun;
 197         struct se_port *port;
 198         struct se_portal_group *tpg = nacl->se_tpg;
 199         u32 i;
 200
 201         spin_lock_irq(&nacl->device_list_lock);
 202         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 203                 deve = nacl->device_list[i];
 204
 205                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 206                         continue;
 207
 208                 lun = deve->se_lun;
 209                 if (!lun) {
 210                         pr_err("%s device entries device pointer is"
 211                                 " NULL, but Initiator has access.\n",
 212                                 tpg->se_tpg_tfo->get_fabric_name());
 213                         continue;
 214                 }
 215                 port = lun->lun_sep;
 216                 if (!port) {
 217                         pr_err("%s device entries device pointer is"
 218                                 " NULL, but Initiator has access.\n",
 219                                 tpg->se_tpg_tfo->get_fabric_name());
 220                         continue;
 221                 }
 222                 if (port->sep_rtpi != rtpi)
 223                         continue;
 224
 225                 atomic_inc(&deve->pr_ref_count);
 226                 smp_mb__after_atomic_inc();
 227                 spin_unlock_irq(&nacl->device_list_lock);
 228
 229                 return deve;
 230         }
 231         spin_unlock_irq(&nacl->device_list_lock);
 232
 233         return NULL;
 234 }
 235
 236 int core_free_device_list_for_node(
 237         struct se_node_acl *nacl,
 238         struct se_portal_group *tpg)
 239 {
 240         struct se_dev_entry *deve;
 241         struct se_lun *lun;
 242         u32 i;
 243
 244         if (!nacl->device_list)
 245                 return 0;
 246
 247         spin_lock_irq(&nacl->device_list_lock);
 248         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 249                 deve = nacl->device_list[i];
 250
 251                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 252                         continue;
 253
 254                 if (!deve->se_lun) {
 255                         pr_err("%s device entries device pointer is"
 256                                 " NULL, but Initiator has access.\n",
 257                                 tpg->se_tpg_tfo->get_fabric_name());
 258                         continue;
 259                 }
 260                 lun = deve->se_lun;
 261
 262                 spin_unlock_irq(&nacl->device_list_lock);
 263                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 264                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 265                 spin_lock_irq(&nacl->device_list_lock);
 266         }
 267         spin_unlock_irq(&nacl->device_list_lock);
 268
 269         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 270         nacl->device_list = NULL;
 271
 272         return 0;
 273 }
 274
 275 void core_update_device_list_access(
 276         u32 mapped_lun,
 277         u32 lun_access,
 278         struct se_node_acl *nacl)
 279 {
 280         struct se_dev_entry *deve;
 281
 282         spin_lock_irq(&nacl->device_list_lock);
 283         deve = nacl->device_list[mapped_lun];
 284         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 285                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 286                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 287         } else {
 288                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 289                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 290         }
 291         spin_unlock_irq(&nacl->device_list_lock);
 292 }
 293
 294 /*      core_enable_device_list_for_node():
 295  *
 296  *
 297  */
 298 int core_enable_device_list_for_node(
 299         struct se_lun *lun,
 300         struct se_lun_acl *lun_acl,
 301         u32 mapped_lun,
 302         u32 lun_access,
 303         struct se_node_acl *nacl,
 304         struct se_portal_group *tpg)
 305 {
 306         struct se_port *port = lun->lun_sep;
 307         struct se_dev_entry *deve;
 308
 309         spin_lock_irq(&nacl->device_list_lock);
 310
 311         deve = nacl->device_list[mapped_lun];
 312
 313         /*
 314          * Check if the call is handling demo mode -> explict LUN ACL
 315          * transition.  This transition must be for the same struct se_lun
 316          * + mapped_lun that was setup in demo mode..
 317          */
 318         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 319                 if (deve->se_lun_acl != NULL) {
 320                         pr_err("struct se_dev_entry->se_lun_acl"
 321                                " already set for demo mode -> explict"
 322                                " LUN ACL transition\n");
 323                         spin_unlock_irq(&nacl->device_list_lock);
 324                         return -EINVAL;
 325                 }
 326                 if (deve->se_lun != lun) {
 327                         pr_err("struct se_dev_entry->se_lun does"
 328                                " match passed struct se_lun for demo mode"
 329                                " -> explict LUN ACL transition\n");
 330                         spin_unlock_irq(&nacl->device_list_lock);
 331                         return -EINVAL;
 332                 }
 333                 deve->se_lun_acl = lun_acl;
 334
 335                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 336                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 337                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 338                 } else {
 339                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 340                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 341                 }
 342
 343                 spin_unlock_irq(&nacl->device_list_lock);
 344                 return 0;
 345         }
 346
 347         deve->se_lun = lun;
 348         deve->se_lun_acl = lun_acl;
 349         deve->mapped_lun = mapped_lun;
 350         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 351
 352         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 353                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 354                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 355         } else {
 356                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 357                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 358         }
 359
 360         deve->creation_time = get_jiffies_64();
 361         deve->attach_count++;
 362         spin_unlock_irq(&nacl->device_list_lock);
 363
 364         spin_lock_bh(&port->sep_alua_lock);
 365         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 366         spin_unlock_bh(&port->sep_alua_lock);
 367
 368         return 0;
 369 }
 370
 371 /*      core_disable_device_list_for_node():
 372  *
 373  *
 374  */
 375 int core_disable_device_list_for_node(
 376         struct se_lun *lun,
 377         struct se_lun_acl *lun_acl,
 378         u32 mapped_lun,
 379         u32 lun_access,
 380         struct se_node_acl *nacl,
 381         struct se_portal_group *tpg)
 382 {
 383         struct se_port *port = lun->lun_sep;
 384         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 385
 386         /*
 387          * If the MappedLUN entry is being disabled, the entry in
 388          * port->sep_alua_list must be removed now before clearing the
 389          * struct se_dev_entry pointers below as logic in
 390          * core_alua_do_transition_tg_pt() depends on these being present.
 391          *
 392          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 393          * that have not been explicitly converted to MappedLUNs ->
 394          * struct se_lun_acl, but we remove deve->alua_port_list from
 395          * port->sep_alua_list. This also means that active UAs and
 396          * NodeACL context specific PR metadata for demo-mode
 397          * MappedLUN *deve will be released below..
 398          */
 399         spin_lock_bh(&port->sep_alua_lock);
 400         list_del(&deve->alua_port_list);
 401         spin_unlock_bh(&port->sep_alua_lock);
 402         /*
 403          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 404          * PR operation to complete.
 405          */
 406         while (atomic_read(&deve->pr_ref_count) != 0)
 407                 cpu_relax();
 408
 409         spin_lock_irq(&nacl->device_list_lock);
 410         /*
 411          * Disable struct se_dev_entry LUN ACL mapping
 412          */
 413         core_scsi3_ua_release_all(deve);
 414         deve->se_lun = NULL;
 415         deve->se_lun_acl = NULL;
 416         deve->lun_flags = 0;
 417         deve->creation_time = 0;
 418         deve->attach_count--;
 419         spin_unlock_irq(&nacl->device_list_lock);
 420
 421         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 422         return 0;
 423 }
 424
 425 /*      core_clear_lun_from_tpg():
 426  *
 427  *
 428  */
 429 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 430 {
 431         struct se_node_acl *nacl;
 432         struct se_dev_entry *deve;
 433         u32 i;
 434
 435         spin_lock_irq(&tpg->acl_node_lock);
 436         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 437                 spin_unlock_irq(&tpg->acl_node_lock);
 438
 439                 spin_lock_irq(&nacl->device_list_lock);
 440                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 441                         deve = nacl->device_list[i];
 442                         if (lun != deve->se_lun)
 443                                 continue;
 444                         spin_unlock_irq(&nacl->device_list_lock);
 445
 446                         core_disable_device_list_for_node(lun, NULL,
 447                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 448                                 nacl, tpg);
 449
 450                         spin_lock_irq(&nacl->device_list_lock);
 451                 }
 452                 spin_unlock_irq(&nacl->device_list_lock);
 453
 454                 spin_lock_irq(&tpg->acl_node_lock);
 455         }
 456         spin_unlock_irq(&tpg->acl_node_lock);
 457 }
 458
 459 static struct se_port *core_alloc_port(struct se_device *dev)
 460 {
 461         struct se_port *port, *port_tmp;
 462
 463         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 464         if (!port) {
 465                 pr_err("Unable to allocate struct se_port\n");
 466                 return ERR_PTR(-ENOMEM);
 467         }
 468         INIT_LIST_HEAD(&port->sep_alua_list);
 469         INIT_LIST_HEAD(&port->sep_list);
 470         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 471         spin_lock_init(&port->sep_alua_lock);
 472         mutex_init(&port->sep_tg_pt_md_mutex);
 473
 474         spin_lock(&dev->se_port_lock);
 475         if (dev->dev_port_count == 0x0000ffff) {
 476                 pr_warn("Reached dev->dev_port_count =="
 477                                 " 0x0000ffff\n");
 478                 spin_unlock(&dev->se_port_lock);
 479                 return ERR_PTR(-ENOSPC);
 480         }
 481 again:
 482         /*
 483          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 484          * Here is the table from spc4r17 section 7.7.3.8.
 485          *
 486          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 487          *
 488          * Code      Description
 489          * 0h        Reserved
 490          * 1h        Relative port 1, historically known as port A
 491          * 2h        Relative port 2, historically known as port B
 492          * 3h to FFFFh    Relative port 3 through 65 535
 493          */
 494         port->sep_rtpi = dev->dev_rpti_counter++;
 495         if (!port->sep_rtpi)
 496                 goto again;
 497
 498         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 499                 /*
 500                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 501                  * for 16-bit wrap..
 502                  */
 503                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 504                         goto again;
 505         }
 506         spin_unlock(&dev->se_port_lock);
 507
 508         return port;
 509 }
 510
 511 static void core_export_port(
 512         struct se_device *dev,
 513         struct se_portal_group *tpg,
 514         struct se_port *port,
 515         struct se_lun *lun)
 516 {
 517         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 518
 519         spin_lock(&dev->se_port_lock);
 520         spin_lock(&lun->lun_sep_lock);
 521         port->sep_tpg = tpg;
 522         port->sep_lun = lun;
 523         lun->lun_sep = port;
 524         spin_unlock(&lun->lun_sep_lock);
 525
 526         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 527         spin_unlock(&dev->se_port_lock);
 528
 529         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
 530             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
 531                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 532                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 533                         pr_err("Unable to allocate t10_alua_tg_pt"
 534                                         "_gp_member_t\n");
 535                         return;
 536                 }
 537                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 538                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 539                         dev->t10_alua.default_tg_pt_gp);
 540                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 541                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 542                         " Group: alua/default_tg_pt_gp\n",
 543                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 544         }
 545
 546         dev->dev_port_count++;
 547         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 548 }
 549
 550 /*
 551  *      Called with struct se_device->se_port_lock spinlock held.
 552  */
 553 static void core_release_port(struct se_device *dev, struct se_port *port)
 554         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 555 {
 556         /*
 557          * Wait for any port reference for PR ALL_TG_PT=1 operation
 558          * to complete in __core_scsi3_alloc_registration()
 559          */
 560         spin_unlock(&dev->se_port_lock);
 561         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 562                 cpu_relax();
 563         spin_lock(&dev->se_port_lock);
 564
 565         core_alua_free_tg_pt_gp_mem(port);
 566
 567         list_del(&port->sep_list);
 568         dev->dev_port_count--;
 569         kfree(port);
 570 }
 571
 572 int core_dev_export(
 573         struct se_device *dev,
 574         struct se_portal_group *tpg,
 575         struct se_lun *lun)
 576 {
 577         struct se_hba *hba = dev->se_hba;
 578         struct se_port *port;
 579
 580         port = core_alloc_port(dev);
 581         if (IS_ERR(port))
 582                 return PTR_ERR(port);
 583
 584         lun->lun_se_dev = dev;
 585
 586         spin_lock(&hba->device_lock);
 587         dev->export_count++;
 588         spin_unlock(&hba->device_lock);
 589
 590         core_export_port(dev, tpg, port, lun);
 591         return 0;
 592 }
 593
 594 void core_dev_unexport(
 595         struct se_device *dev,
 596         struct se_portal_group *tpg,
 597         struct se_lun *lun)
 598 {
 599         struct se_hba *hba = dev->se_hba;
 600         struct se_port *port = lun->lun_sep;
 601
 602         spin_lock(&lun->lun_sep_lock);
 603         if (lun->lun_se_dev == NULL) {
 604                 spin_unlock(&lun->lun_sep_lock);
 605                 return;
 606         }
 607         spin_unlock(&lun->lun_sep_lock);
 608
 609         spin_lock(&dev->se_port_lock);
 610         core_release_port(dev, port);
 611         spin_unlock(&dev->se_port_lock);
 612
 613         spin_lock(&hba->device_lock);
 614         dev->export_count--;
 615         spin_unlock(&hba->device_lock);
 616
 617         lun->lun_se_dev = NULL;
 618 }
 619
 620 static void se_release_vpd_for_dev(struct se_device *dev)
 621 {
 622         struct t10_vpd *vpd, *vpd_tmp;
 623
 624         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 625         list_for_each_entry_safe(vpd, vpd_tmp,
 626                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 627                 list_del(&vpd->vpd_list);
 628                 kfree(vpd);
 629         }
 630         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 631 }
 632
 633 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 634 {
 635         u32 aligned_max_sectors;
 636         u32 alignment;
 637         /*
 638          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 639          * transport_allocate_data_tasks() operation.
 640          */
 641         alignment = max(1ul, PAGE_SIZE / block_size);
 642         aligned_max_sectors = rounddown(max_sectors, alignment);
 643
 644         if (max_sectors != aligned_max_sectors)
 645                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 646                         max_sectors, aligned_max_sectors);
 647
 648         return aligned_max_sectors;
 649 }
 650
 651 int se_dev_set_max_unmap_lba_count(
 652         struct se_device *dev,
 653         u32 max_unmap_lba_count)
 654 {
 655         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 656         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 657                         dev, dev->dev_attrib.max_unmap_lba_count);
 658         return 0;
 659 }
 660
 661 int se_dev_set_max_unmap_block_desc_count(
 662         struct se_device *dev,
 663         u32 max_unmap_block_desc_count)
 664 {
 665         dev->dev_attrib.max_unmap_block_desc_count =
 666                 max_unmap_block_desc_count;
 667         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 668                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 669         return 0;
 670 }
 671
 672 int se_dev_set_unmap_granularity(
 673         struct se_device *dev,
 674         u32 unmap_granularity)
 675 {
 676         dev->dev_attrib.unmap_granularity = unmap_granularity;
 677         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 678                         dev, dev->dev_attrib.unmap_granularity);
 679         return 0;
 680 }
 681
 682 int se_dev_set_unmap_granularity_alignment(
 683         struct se_device *dev,
 684         u32 unmap_granularity_alignment)
 685 {
 686         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 687         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 688                         dev, dev->dev_attrib.unmap_granularity_alignment);
 689         return 0;
 690 }
 691
 692 int se_dev_set_max_write_same_len(
 693         struct se_device *dev,
 694         u32 max_write_same_len)
 695 {
 696         dev->dev_attrib.max_write_same_len = max_write_same_len;
 697         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 698                         dev, dev->dev_attrib.max_write_same_len);
 699         return 0;
 700 }
 701
 702 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 703 {
 704         const char *configname;
 705
 706         configname = config_item_name(&dev->dev_group.cg_item);
 707         if (strlen(configname) >= 16) {
 708                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 709                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 710                         configname);
 711         }
 712         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 713 }
 714
 715 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 716 {
 717         if (dev->export_count) {
 718                 pr_err("dev[%p]: Unable to change model alias"
 719                         " while export_count is %d\n",
 720                         dev, dev->export_count);
 721                         return -EINVAL;
 722         }
 723
 724         if (flag != 0 && flag != 1) {
 725                 pr_err("Illegal value %d\n", flag);
 726                 return -EINVAL;
 727         }
 728
 729         if (flag) {
 730                 dev_set_t10_wwn_model_alias(dev);
 731         } else {
 732                 strncpy(&dev->t10_wwn.model[0],
 733                         dev->transport->inquiry_prod, 16);
 734         }
 735         dev->dev_attrib.emulate_model_alias = flag;
 736
 737         return 0;
 738 }
 739
 740 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 741 {
 742         if (flag != 0 && flag != 1) {
 743                 pr_err("Illegal value %d\n", flag);
 744                 return -EINVAL;
 745         }
 746
 747         if (flag) {
 748                 pr_err("dpo_emulated not supported\n");
 749                 return -EINVAL;
 750         }
 751
 752         return 0;
 753 }
 754
 755 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 756 {
 757         if (flag != 0 && flag != 1) {
 758                 pr_err("Illegal value %d\n", flag);
 759                 return -EINVAL;
 760         }
 761
 762         if (flag &&
 763             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 764                 pr_err("emulate_fua_write not supported for pSCSI\n");
 765                 return -EINVAL;
 766         }
 767         dev->dev_attrib.emulate_fua_write = flag;
 768         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 769                         dev, dev->dev_attrib.emulate_fua_write);
 770         return 0;
 771 }
 772
 773 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 774 {
 775         if (flag != 0 && flag != 1) {
 776                 pr_err("Illegal value %d\n", flag);
 777                 return -EINVAL;
 778         }
 779
 780         if (flag) {
 781                 pr_err("ua read emulated not supported\n");
 782                 return -EINVAL;
 783         }
 784
 785         return 0;
 786 }
 787
 788 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 789 {
 790         if (flag != 0 && flag != 1) {
 791                 pr_err("Illegal value %d\n", flag);
 792                 return -EINVAL;
 793         }
 794         if (flag &&
 795             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 796                 pr_err("emulate_write_cache not supported for pSCSI\n");
 797                 return -EINVAL;
 798         }
 799         if (dev->transport->get_write_cache) {
 800                 pr_warn("emulate_write_cache cannot be changed when underlying"
 801                         " HW reports WriteCacheEnabled, ignoring request\n");
 802                 return 0;
 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
 811 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 812 {
 813         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 814                 pr_err("Illegal value %d\n", flag);
 815                 return -EINVAL;
 816         }
 817
 818         if (dev->export_count) {
 819                 pr_err("dev[%p]: Unable to change SE Device"
 820                         " UA_INTRLCK_CTRL while export_count is %d\n",
 821                         dev, dev->export_count);
 822                 return -EINVAL;
 823         }
 824         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 825         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 826                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 827
 828         return 0;
 829 }
 830
 831 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 832 {
 833         if ((flag != 0) && (flag != 1)) {
 834                 pr_err("Illegal value %d\n", flag);
 835                 return -EINVAL;
 836         }
 837
 838         if (dev->export_count) {
 839                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 840                         " export_count is %d\n",
 841                         dev, dev->export_count);
 842                 return -EINVAL;
 843         }
 844         dev->dev_attrib.emulate_tas = flag;
 845         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 846                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 847
 848         return 0;
 849 }
 850
 851 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 852 {
 853         if ((flag != 0) && (flag != 1)) {
 854                 pr_err("Illegal value %d\n", flag);
 855                 return -EINVAL;
 856         }
 857         /*
 858          * We expect this value to be non-zero when generic Block Layer
 859          * Discard supported is detected iblock_create_virtdevice().
 860          */
 861         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 862                 pr_err("Generic Block Discard not supported\n");
 863                 return -ENOSYS;
 864         }
 865
 866         dev->dev_attrib.emulate_tpu = flag;
 867         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 868                                 dev, flag);
 869         return 0;
 870 }
 871
 872 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 873 {
 874         if ((flag != 0) && (flag != 1)) {
 875                 pr_err("Illegal value %d\n", flag);
 876                 return -EINVAL;
 877         }
 878         /*
 879          * We expect this value to be non-zero when generic Block Layer
 880          * Discard supported is detected iblock_create_virtdevice().
 881          */
 882         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 883                 pr_err("Generic Block Discard not supported\n");
 884                 return -ENOSYS;
 885         }
 886
 887         dev->dev_attrib.emulate_tpws = flag;
 888         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 889                                 dev, flag);
 890         return 0;
 891 }
 892
 893 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
 894 {
 895         if ((flag != 0) && (flag != 1)) {
 896                 pr_err("Illegal value %d\n", flag);
 897                 return -EINVAL;
 898         }
 899         dev->dev_attrib.enforce_pr_isids = flag;
 900         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
 901                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
 902         return 0;
 903 }
 904
 905 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
 906 {
 907         if ((flag != 0) && (flag != 1)) {
 908                 printk(KERN_ERR "Illegal value %d\n", flag);
 909                 return -EINVAL;
 910         }
 911         dev->dev_attrib.is_nonrot = flag;
 912         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
 913                dev, flag);
 914         return 0;
 915 }
 916
 917 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
 918 {
 919         if (flag != 0) {
 920                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
 921                         " reordering not implemented\n", dev);
 922                 return -ENOSYS;
 923         }
 924         dev->dev_attrib.emulate_rest_reord = flag;
 925         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
 926         return 0;
 927 }
 928
 929 /*
 930  * Note, this can only be called on unexported SE Device Object.
 931  */
 932 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
 933 {
 934         if (dev->export_count) {
 935                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
 936                         " export_count is %d\n",
 937                         dev, dev->export_count);
 938                 return -EINVAL;
 939         }
 940         if (!queue_depth) {
 941                 pr_err("dev[%p]: Illegal ZERO value for queue"
 942                         "_depth\n", dev);
 943                 return -EINVAL;
 944         }
 945
 946         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 947                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 948                         pr_err("dev[%p]: Passed queue_depth: %u"
 949                                 " exceeds TCM/SE_Device TCQ: %u\n",
 950                                 dev, queue_depth,
 951                                 dev->dev_attrib.hw_queue_depth);
 952                         return -EINVAL;
 953                 }
 954         } else {
 955                 if (queue_depth > dev->dev_attrib.queue_depth) {
 956                         if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 957                                 pr_err("dev[%p]: Passed queue_depth:"
 958                                         " %u exceeds TCM/SE_Device MAX"
 959                                         " TCQ: %u\n", dev, queue_depth,
 960                                         dev->dev_attrib.hw_queue_depth);
 961                                 return -EINVAL;
 962                         }
 963                 }
 964         }
 965
 966         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
 967         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
 968                         dev, queue_depth);
 969         return 0;
 970 }
 971
 972 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
 973 {
 974         int block_size = dev->dev_attrib.block_size;
 975
 976         if (dev->export_count) {
 977                 pr_err("dev[%p]: Unable to change SE Device"
 978                         " fabric_max_sectors while export_count is %d\n",
 979                         dev, dev->export_count);
 980                 return -EINVAL;
 981         }
 982         if (!fabric_max_sectors) {
 983                 pr_err("dev[%p]: Illegal ZERO value for"
 984                         " fabric_max_sectors\n", dev);
 985                 return -EINVAL;
 986         }
 987         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
 988                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
 989                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
 990                                 DA_STATUS_MAX_SECTORS_MIN);
 991                 return -EINVAL;
 992         }
 993         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 994                 if (fabric_max_sectors > dev->dev_attrib.hw_max_sectors) {
 995                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
 996                                 " greater than TCM/SE_Device max_sectors:"
 997                                 " %u\n", dev, fabric_max_sectors,
 998                                 dev->dev_attrib.hw_max_sectors);
 999                          return -EINVAL;
1000                 }
1001         } else {
1002                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1003                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1004                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1005                                 " %u\n", dev, fabric_max_sectors,
1006                                 DA_STATUS_MAX_SECTORS_MAX);
1007                         return -EINVAL;
1008                 }
1009         }
1010         /*
1011          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1012          */
1013         if (!block_size) {
1014                 block_size = 512;
1015                 pr_warn("Defaulting to 512 for zero block_size\n");
1016         }
1017         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1018                                                       block_size);
1019
1020         dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1021         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1022                         dev, fabric_max_sectors);
1023         return 0;
1024 }
1025
1026 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1027 {
1028         if (dev->export_count) {
1029                 pr_err("dev[%p]: Unable to change SE Device"
1030                         " optimal_sectors while export_count is %d\n",
1031                         dev, dev->export_count);
1032                 return -EINVAL;
1033         }
1034         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1035                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1036                                 " changed for TCM/pSCSI\n", dev);
1037                 return -EINVAL;
1038         }
1039         if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1040                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1041                         " greater than fabric_max_sectors: %u\n", dev,
1042                         optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1043                 return -EINVAL;
1044         }
1045
1046         dev->dev_attrib.optimal_sectors = optimal_sectors;
1047         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1048                         dev, optimal_sectors);
1049         return 0;
1050 }
1051
1052 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1053 {
1054         if (dev->export_count) {
1055                 pr_err("dev[%p]: Unable to change SE Device block_size"
1056                         " while export_count is %d\n",
1057                         dev, dev->export_count);
1058                 return -EINVAL;
1059         }
1060
1061         if ((block_size != 512) &&
1062             (block_size != 1024) &&
1063             (block_size != 2048) &&
1064             (block_size != 4096)) {
1065                 pr_err("dev[%p]: Illegal value for block_device: %u"
1066                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1067                         dev, block_size);
1068                 return -EINVAL;
1069         }
1070
1071         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1072                 pr_err("dev[%p]: Not allowed to change block_size for"
1073                         " Physical Device, use for Linux/SCSI to change"
1074                         " block_size for underlying hardware\n", dev);
1075                 return -EINVAL;
1076         }
1077
1078         dev->dev_attrib.block_size = block_size;
1079         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1080                         dev, block_size);
1081
1082         if (dev->dev_attrib.max_bytes_per_io)
1083                 dev->dev_attrib.hw_max_sectors =
1084                         dev->dev_attrib.max_bytes_per_io / block_size;
1085
1086         return 0;
1087 }
1088
1089 struct se_lun *core_dev_add_lun(
1090         struct se_portal_group *tpg,
1091         struct se_device *dev,
1092         u32 lun)
1093 {
1094         struct se_lun *lun_p;
1095         int rc;
1096
1097         lun_p = core_tpg_pre_addlun(tpg, lun);
1098         if (IS_ERR(lun_p))
1099                 return lun_p;
1100
1101         rc = core_tpg_post_addlun(tpg, lun_p,
1102                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1103         if (rc < 0)
1104                 return ERR_PTR(rc);
1105
1106         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1107                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1108                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1109                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1110         /*
1111          * Update LUN maps for dynamically added initiators when
1112          * generate_node_acl is enabled.
1113          */
1114         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1115                 struct se_node_acl *acl;
1116                 spin_lock_irq(&tpg->acl_node_lock);
1117                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1118                         if (acl->dynamic_node_acl &&
1119                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1120                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1121                                 spin_unlock_irq(&tpg->acl_node_lock);
1122                                 core_tpg_add_node_to_devs(acl, tpg);
1123                                 spin_lock_irq(&tpg->acl_node_lock);
1124                         }
1125                 }
1126                 spin_unlock_irq(&tpg->acl_node_lock);
1127         }
1128
1129         return lun_p;
1130 }
1131
1132 /*      core_dev_del_lun():
1133  *
1134  *
1135  */
1136 int core_dev_del_lun(
1137         struct se_portal_group *tpg,
1138         u32 unpacked_lun)
1139 {
1140         struct se_lun *lun;
1141
1142         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1143         if (IS_ERR(lun))
1144                 return PTR_ERR(lun);
1145
1146         core_tpg_post_dellun(tpg, lun);
1147
1148         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1149                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1150                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1151                 tpg->se_tpg_tfo->get_fabric_name());
1152
1153         return 0;
1154 }
1155
1156 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1157 {
1158         struct se_lun *lun;
1159
1160         spin_lock(&tpg->tpg_lun_lock);
1161         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1162                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1163                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1164                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1165                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1166                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1167                 spin_unlock(&tpg->tpg_lun_lock);
1168                 return NULL;
1169         }
1170         lun = tpg->tpg_lun_list[unpacked_lun];
1171
1172         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1173                 pr_err("%s Logical Unit Number: %u is not free on"
1174                         " Target Portal Group: %hu, ignoring request.\n",
1175                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1176                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1177                 spin_unlock(&tpg->tpg_lun_lock);
1178                 return NULL;
1179         }
1180         spin_unlock(&tpg->tpg_lun_lock);
1181
1182         return lun;
1183 }
1184
1185 /*      core_dev_get_lun():
1186  *
1187  *
1188  */
1189 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1190 {
1191         struct se_lun *lun;
1192
1193         spin_lock(&tpg->tpg_lun_lock);
1194         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1195                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1196                         "_TPG-1: %u for Target Portal Group: %hu\n",
1197                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1198                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1199                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1200                 spin_unlock(&tpg->tpg_lun_lock);
1201                 return NULL;
1202         }
1203         lun = tpg->tpg_lun_list[unpacked_lun];
1204
1205         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1206                 pr_err("%s Logical Unit Number: %u is not active on"
1207                         " Target Portal Group: %hu, ignoring request.\n",
1208                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1209                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1210                 spin_unlock(&tpg->tpg_lun_lock);
1211                 return NULL;
1212         }
1213         spin_unlock(&tpg->tpg_lun_lock);
1214
1215         return lun;
1216 }
1217
1218 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1219         struct se_portal_group *tpg,
1220         struct se_node_acl *nacl,
1221         u32 mapped_lun,
1222         int *ret)
1223 {
1224         struct se_lun_acl *lacl;
1225
1226         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1227                 pr_err("%s InitiatorName exceeds maximum size.\n",
1228                         tpg->se_tpg_tfo->get_fabric_name());
1229                 *ret = -EOVERFLOW;
1230                 return NULL;
1231         }
1232         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1233         if (!lacl) {
1234                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1235                 *ret = -ENOMEM;
1236                 return NULL;
1237         }
1238
1239         INIT_LIST_HEAD(&lacl->lacl_list);
1240         lacl->mapped_lun = mapped_lun;
1241         lacl->se_lun_nacl = nacl;
1242         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1243                  nacl->initiatorname);
1244
1245         return lacl;
1246 }
1247
1248 int core_dev_add_initiator_node_lun_acl(
1249         struct se_portal_group *tpg,
1250         struct se_lun_acl *lacl,
1251         u32 unpacked_lun,
1252         u32 lun_access)
1253 {
1254         struct se_lun *lun;
1255         struct se_node_acl *nacl;
1256
1257         lun = core_dev_get_lun(tpg, unpacked_lun);
1258         if (!lun) {
1259                 pr_err("%s Logical Unit Number: %u is not active on"
1260                         " Target Portal Group: %hu, ignoring request.\n",
1261                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1262                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1263                 return -EINVAL;
1264         }
1265
1266         nacl = lacl->se_lun_nacl;
1267         if (!nacl)
1268                 return -EINVAL;
1269
1270         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1271             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1272                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1273
1274         lacl->se_lun = lun;
1275
1276         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1277                         lun_access, nacl, tpg) < 0)
1278                 return -EINVAL;
1279
1280         spin_lock(&lun->lun_acl_lock);
1281         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1282         atomic_inc(&lun->lun_acl_count);
1283         smp_mb__after_atomic_inc();
1284         spin_unlock(&lun->lun_acl_lock);
1285
1286         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1287                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1288                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1289                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1290                 lacl->initiatorname);
1291         /*
1292          * Check to see if there are any existing persistent reservation APTPL
1293          * pre-registrations that need to be enabled for this LUN ACL..
1294          */
1295         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1296         return 0;
1297 }
1298
1299 /*      core_dev_del_initiator_node_lun_acl():
1300  *
1301  *
1302  */
1303 int core_dev_del_initiator_node_lun_acl(
1304         struct se_portal_group *tpg,
1305         struct se_lun *lun,
1306         struct se_lun_acl *lacl)
1307 {
1308         struct se_node_acl *nacl;
1309
1310         nacl = lacl->se_lun_nacl;
1311         if (!nacl)
1312                 return -EINVAL;
1313
1314         spin_lock(&lun->lun_acl_lock);
1315         list_del(&lacl->lacl_list);
1316         atomic_dec(&lun->lun_acl_count);
1317         smp_mb__after_atomic_dec();
1318         spin_unlock(&lun->lun_acl_lock);
1319
1320         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1321                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1322
1323         lacl->se_lun = NULL;
1324
1325         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1326                 " InitiatorNode: %s Mapped LUN: %u\n",
1327                 tpg->se_tpg_tfo->get_fabric_name(),
1328                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1329                 lacl->initiatorname, lacl->mapped_lun);
1330
1331         return 0;
1332 }
1333
1334 void core_dev_free_initiator_node_lun_acl(
1335         struct se_portal_group *tpg,
1336         struct se_lun_acl *lacl)
1337 {
1338         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1339                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1340                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1341                 tpg->se_tpg_tfo->get_fabric_name(),
1342                 lacl->initiatorname, lacl->mapped_lun);
1343
1344         kfree(lacl);
1345 }
1346
1347 static void scsi_dump_inquiry(struct se_device *dev)
1348 {
1349         struct t10_wwn *wwn = &dev->t10_wwn;
1350         char buf[17];
1351         int i, device_type;
1352         /*
1353          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1354          */
1355         for (i = 0; i < 8; i++)
1356                 if (wwn->vendor[i] >= 0x20)
1357                         buf[i] = wwn->vendor[i];
1358                 else
1359                         buf[i] = ' ';
1360         buf[i] = '\0';
1361         pr_debug("  Vendor: %s\n", buf);
1362
1363         for (i = 0; i < 16; i++)
1364                 if (wwn->model[i] >= 0x20)
1365                         buf[i] = wwn->model[i];
1366                 else
1367                         buf[i] = ' ';
1368         buf[i] = '\0';
1369         pr_debug("  Model: %s\n", buf);
1370
1371         for (i = 0; i < 4; i++)
1372                 if (wwn->revision[i] >= 0x20)
1373                         buf[i] = wwn->revision[i];
1374                 else
1375                         buf[i] = ' ';
1376         buf[i] = '\0';
1377         pr_debug("  Revision: %s\n", buf);
1378
1379         device_type = dev->transport->get_device_type(dev);
1380         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1381 }
1382
1383 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1384 {
1385         struct se_device *dev;
1386
1387         dev = hba->transport->alloc_device(hba, name);
1388         if (!dev)
1389                 return NULL;
1390
1391         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1392         dev->se_hba = hba;
1393         dev->transport = hba->transport;
1394
1395         INIT_LIST_HEAD(&dev->dev_list);
1396         INIT_LIST_HEAD(&dev->dev_sep_list);
1397         INIT_LIST_HEAD(&dev->dev_tmr_list);
1398         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1399         INIT_LIST_HEAD(&dev->state_list);
1400         INIT_LIST_HEAD(&dev->qf_cmd_list);
1401         spin_lock_init(&dev->stats_lock);
1402         spin_lock_init(&dev->execute_task_lock);
1403         spin_lock_init(&dev->delayed_cmd_lock);
1404         spin_lock_init(&dev->dev_reservation_lock);
1405         spin_lock_init(&dev->se_port_lock);
1406         spin_lock_init(&dev->se_tmr_lock);
1407         spin_lock_init(&dev->qf_cmd_lock);
1408         atomic_set(&dev->dev_ordered_id, 0);
1409         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1410         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1411         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1412         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1413         spin_lock_init(&dev->t10_pr.registration_lock);
1414         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1415         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1416         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1417
1418         dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1419         dev->t10_wwn.t10_dev = dev;
1420         dev->t10_alua.t10_dev = dev;
1421
1422         dev->dev_attrib.da_dev = dev;
1423         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1424         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1425         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1426         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1427         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1428         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1429         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1430         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1431         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1432         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1433         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1434         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1435         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1436         dev->dev_attrib.max_unmap_block_desc_count =
1437                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1438         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1439         dev->dev_attrib.unmap_granularity_alignment =
1440                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1441         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1442         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1443         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1444
1445         return dev;
1446 }
1447
1448 int target_configure_device(struct se_device *dev)
1449 {
1450         struct se_hba *hba = dev->se_hba;
1451         int ret;
1452
1453         if (dev->dev_flags & DF_CONFIGURED) {
1454                 pr_err("se_dev->se_dev_ptr already set for storage"
1455                                 " object\n");
1456                 return -EEXIST;
1457         }
1458
1459         ret = dev->transport->configure_device(dev);
1460         if (ret)
1461                 goto out;
1462         dev->dev_flags |= DF_CONFIGURED;
1463
1464         /*
1465          * XXX: there is not much point to have two different values here..
1466          */
1467         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1468         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1469
1470         /*
1471          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1472          */
1473         dev->dev_attrib.hw_max_sectors =
1474                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1475                                          dev->dev_attrib.hw_block_size);
1476
1477         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1478         dev->creation_time = get_jiffies_64();
1479
1480         ret = core_setup_alua(dev);
1481         if (ret)
1482                 goto out;
1483
1484         /*
1485          * Startup the struct se_device processing thread
1486          */
1487         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1488                                       dev->transport->name);
1489         if (!dev->tmr_wq) {
1490                 pr_err("Unable to create tmr workqueue for %s\n",
1491                         dev->transport->name);
1492                 ret = -ENOMEM;
1493                 goto out_free_alua;
1494         }
1495
1496         /*
1497          * Setup work_queue for QUEUE_FULL
1498          */
1499         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1500
1501         /*
1502          * Preload the initial INQUIRY const values if we are doing
1503          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1504          * passthrough because this is being provided by the backend LLD.
1505          */
1506         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1507                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1508                 strncpy(&dev->t10_wwn.model[0],
1509                         dev->transport->inquiry_prod, 16);
1510                 strncpy(&dev->t10_wwn.revision[0],
1511                         dev->transport->inquiry_rev, 4);
1512         }
1513
1514         scsi_dump_inquiry(dev);
1515
1516         spin_lock(&hba->device_lock);
1517         hba->dev_count++;
1518         spin_unlock(&hba->device_lock);
1519         return 0;
1520
1521 out_free_alua:
1522         core_alua_free_lu_gp_mem(dev);
1523 out:
1524         se_release_vpd_for_dev(dev);
1525         return ret;
1526 }
1527
1528 void target_free_device(struct se_device *dev)
1529 {
1530         struct se_hba *hba = dev->se_hba;
1531
1532         WARN_ON(!list_empty(&dev->dev_sep_list));
1533
1534         if (dev->dev_flags & DF_CONFIGURED) {
1535                 destroy_workqueue(dev->tmr_wq);
1536
1537                 spin_lock(&hba->device_lock);
1538                 hba->dev_count--;
1539                 spin_unlock(&hba->device_lock);
1540         }
1541
1542         core_alua_free_lu_gp_mem(dev);
1543         core_scsi3_free_all_registrations(dev);
1544         se_release_vpd_for_dev(dev);
1545
1546         dev->transport->free_device(dev);
1547 }
1548
1549 int core_dev_setup_virtual_lun0(void)
1550 {
1551         struct se_hba *hba;
1552         struct se_device *dev;
1553         char buf[16];
1554         int ret;
1555
1556         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1557         if (IS_ERR(hba))
1558                 return PTR_ERR(hba);
1559
1560         dev = target_alloc_device(hba, "virt_lun0");
1561         if (!dev) {
1562                 ret = -ENOMEM;
1563                 goto out_free_hba;
1564         }
1565
1566         memset(buf, 0, 16);
1567         sprintf(buf, "rd_pages=8");
1568         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1569
1570         ret = target_configure_device(dev);
1571         if (ret)
1572                 goto out_free_se_dev;
1573
1574         lun0_hba = hba;
1575         g_lun0_dev = dev;
1576         return 0;
1577
1578 out_free_se_dev:
1579         target_free_device(dev);
1580 out_free_hba:
1581         core_delete_hba(hba);
1582         return ret;
1583 }
1584
1585
1586 void core_dev_release_virtual_lun0(void)
1587 {
1588         struct se_hba *hba = lun0_hba;
1589
1590         if (!hba)
1591                 return;
1592
1593         if (g_lun0_dev)
1594                 target_free_device(g_lun0_dev);
1595         core_delete_hba(hba);
1596 }