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_sep = NULL;
 618         lun->lun_se_dev = NULL;
 619 }
 620
 621 static void se_release_vpd_for_dev(struct se_device *dev)
 622 {
 623         struct t10_vpd *vpd, *vpd_tmp;
 624
 625         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 626         list_for_each_entry_safe(vpd, vpd_tmp,
 627                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 628                 list_del(&vpd->vpd_list);
 629                 kfree(vpd);
 630         }
 631         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 632 }
 633
 634 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 635 {
 636         u32 aligned_max_sectors;
 637         u32 alignment;
 638         /*
 639          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 640          * transport_allocate_data_tasks() operation.
 641          */
 642         alignment = max(1ul, PAGE_SIZE / block_size);
 643         aligned_max_sectors = rounddown(max_sectors, alignment);
 644
 645         if (max_sectors != aligned_max_sectors)
 646                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 647                         max_sectors, aligned_max_sectors);
 648
 649         return aligned_max_sectors;
 650 }
 651
 652 int se_dev_set_max_unmap_lba_count(
 653         struct se_device *dev,
 654         u32 max_unmap_lba_count)
 655 {
 656         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 657         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 658                         dev, dev->dev_attrib.max_unmap_lba_count);
 659         return 0;
 660 }
 661
 662 int se_dev_set_max_unmap_block_desc_count(
 663         struct se_device *dev,
 664         u32 max_unmap_block_desc_count)
 665 {
 666         dev->dev_attrib.max_unmap_block_desc_count =
 667                 max_unmap_block_desc_count;
 668         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 669                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 670         return 0;
 671 }
 672
 673 int se_dev_set_unmap_granularity(
 674         struct se_device *dev,
 675         u32 unmap_granularity)
 676 {
 677         dev->dev_attrib.unmap_granularity = unmap_granularity;
 678         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 679                         dev, dev->dev_attrib.unmap_granularity);
 680         return 0;
 681 }
 682
 683 int se_dev_set_unmap_granularity_alignment(
 684         struct se_device *dev,
 685         u32 unmap_granularity_alignment)
 686 {
 687         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 688         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 689                         dev, dev->dev_attrib.unmap_granularity_alignment);
 690         return 0;
 691 }
 692
 693 int se_dev_set_max_write_same_len(
 694         struct se_device *dev,
 695         u32 max_write_same_len)
 696 {
 697         dev->dev_attrib.max_write_same_len = max_write_same_len;
 698         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 699                         dev, dev->dev_attrib.max_write_same_len);
 700         return 0;
 701 }
 702
 703 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 704 {
 705         const char *configname;
 706
 707         configname = config_item_name(&dev->dev_group.cg_item);
 708         if (strlen(configname) >= 16) {
 709                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
 710                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 711                         configname);
 712         }
 713         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 714 }
 715
 716 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 717 {
 718         if (dev->export_count) {
 719                 pr_err("dev[%p]: Unable to change model alias"
 720                         " while export_count is %d\n",
 721                         dev, dev->export_count);
 722                         return -EINVAL;
 723         }
 724
 725         if (flag != 0 && flag != 1) {
 726                 pr_err("Illegal value %d\n", flag);
 727                 return -EINVAL;
 728         }
 729
 730         if (flag) {
 731                 dev_set_t10_wwn_model_alias(dev);
 732         } else {
 733                 strncpy(&dev->t10_wwn.model[0],
 734                         dev->transport->inquiry_prod, 16);
 735         }
 736         dev->dev_attrib.emulate_model_alias = flag;
 737
 738         return 0;
 739 }
 740
 741 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 742 {
 743         if (flag != 0 && flag != 1) {
 744                 pr_err("Illegal value %d\n", flag);
 745                 return -EINVAL;
 746         }
 747
 748         if (flag) {
 749                 pr_err("dpo_emulated not supported\n");
 750                 return -EINVAL;
 751         }
 752
 753         return 0;
 754 }
 755
 756 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 757 {
 758         if (flag != 0 && flag != 1) {
 759                 pr_err("Illegal value %d\n", flag);
 760                 return -EINVAL;
 761         }
 762
 763         if (flag &&
 764             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 765                 pr_err("emulate_fua_write not supported for pSCSI\n");
 766                 return -EINVAL;
 767         }
 768         dev->dev_attrib.emulate_fua_write = flag;
 769         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 770                         dev, dev->dev_attrib.emulate_fua_write);
 771         return 0;
 772 }
 773
 774 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 775 {
 776         if (flag != 0 && flag != 1) {
 777                 pr_err("Illegal value %d\n", flag);
 778                 return -EINVAL;
 779         }
 780
 781         if (flag) {
 782                 pr_err("ua read emulated not supported\n");
 783                 return -EINVAL;
 784         }
 785
 786         return 0;
 787 }
 788
 789 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 790 {
 791         if (flag != 0 && flag != 1) {
 792                 pr_err("Illegal value %d\n", flag);
 793                 return -EINVAL;
 794         }
 795         if (flag &&
 796             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 797                 pr_err("emulate_write_cache not supported for pSCSI\n");
 798                 return -EINVAL;
 799         }
 800         if (flag &&
 801             dev->transport->get_write_cache) {
 802                 pr_err("emulate_write_cache not supported for this device\n");
 803                 return -EINVAL;
 804         }
 805
 806         dev->dev_attrib.emulate_write_cache = flag;
 807         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 808                         dev, dev->dev_attrib.emulate_write_cache);
 809         return 0;
 810 }
 811
 812 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 813 {
 814         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 815                 pr_err("Illegal value %d\n", flag);
 816                 return -EINVAL;
 817         }
 818
 819         if (dev->export_count) {
 820                 pr_err("dev[%p]: Unable to change SE Device"
 821                         " UA_INTRLCK_CTRL while export_count is %d\n",
 822                         dev, dev->export_count);
 823                 return -EINVAL;
 824         }
 825         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 826         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 827                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 828
 829         return 0;
 830 }
 831
 832 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 833 {
 834         if ((flag != 0) && (flag != 1)) {
 835                 pr_err("Illegal value %d\n", flag);
 836                 return -EINVAL;
 837         }
 838
 839         if (dev->export_count) {
 840                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 841                         " export_count is %d\n",
 842                         dev, dev->export_count);
 843                 return -EINVAL;
 844         }
 845         dev->dev_attrib.emulate_tas = flag;
 846         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 847                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 848
 849         return 0;
 850 }
 851
 852 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 853 {
 854         if ((flag != 0) && (flag != 1)) {
 855                 pr_err("Illegal value %d\n", flag);
 856                 return -EINVAL;
 857         }
 858         /*
 859          * We expect this value to be non-zero when generic Block Layer
 860          * Discard supported is detected iblock_create_virtdevice().
 861          */
 862         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 863                 pr_err("Generic Block Discard not supported\n");
 864                 return -ENOSYS;
 865         }
 866
 867         dev->dev_attrib.emulate_tpu = flag;
 868         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 869                                 dev, flag);
 870         return 0;
 871 }
 872
 873 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 874 {
 875         if ((flag != 0) && (flag != 1)) {
 876                 pr_err("Illegal value %d\n", flag);
 877                 return -EINVAL;
 878         }
 879         /*
 880          * We expect this value to be non-zero when generic Block Layer
 881          * Discard supported is detected iblock_create_virtdevice().
 882          */
 883         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 884                 pr_err("Generic Block Discard not supported\n");
 885                 return -ENOSYS;
 886         }
 887
 888         dev->dev_attrib.emulate_tpws = flag;
 889         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 890                                 dev, flag);
 891         return 0;
 892 }
 893
 894 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
 895 {
 896         if ((flag != 0) && (flag != 1)) {
 897                 pr_err("Illegal value %d\n", flag);
 898                 return -EINVAL;
 899         }
 900         dev->dev_attrib.enforce_pr_isids = flag;
 901         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
 902                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
 903         return 0;
 904 }
 905
 906 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
 907 {
 908         if ((flag != 0) && (flag != 1)) {
 909                 printk(KERN_ERR "Illegal value %d\n", flag);
 910                 return -EINVAL;
 911         }
 912         dev->dev_attrib.is_nonrot = flag;
 913         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
 914                dev, flag);
 915         return 0;
 916 }
 917
 918 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
 919 {
 920         if (flag != 0) {
 921                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
 922                         " reordering not implemented\n", dev);
 923                 return -ENOSYS;
 924         }
 925         dev->dev_attrib.emulate_rest_reord = flag;
 926         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
 927         return 0;
 928 }
 929
 930 /*
 931  * Note, this can only be called on unexported SE Device Object.
 932  */
 933 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
 934 {
 935         if (dev->export_count) {
 936                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
 937                         " export_count is %d\n",
 938                         dev, dev->export_count);
 939                 return -EINVAL;
 940         }
 941         if (!queue_depth) {
 942                 pr_err("dev[%p]: Illegal ZERO value for queue"
 943                         "_depth\n", dev);
 944                 return -EINVAL;
 945         }
 946
 947         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 948                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 949                         pr_err("dev[%p]: Passed queue_depth: %u"
 950                                 " exceeds TCM/SE_Device TCQ: %u\n",
 951                                 dev, queue_depth,
 952                                 dev->dev_attrib.hw_queue_depth);
 953                         return -EINVAL;
 954                 }
 955         } else {
 956                 if (queue_depth > dev->dev_attrib.queue_depth) {
 957                         if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 958                                 pr_err("dev[%p]: Passed queue_depth:"
 959                                         " %u exceeds TCM/SE_Device MAX"
 960                                         " TCQ: %u\n", dev, queue_depth,
 961                                         dev->dev_attrib.hw_queue_depth);
 962                                 return -EINVAL;
 963                         }
 964                 }
 965         }
 966
 967         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
 968         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
 969                         dev, queue_depth);
 970         return 0;
 971 }
 972
 973 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
 974 {
 975         int block_size = dev->dev_attrib.block_size;
 976
 977         if (dev->export_count) {
 978                 pr_err("dev[%p]: Unable to change SE Device"
 979                         " fabric_max_sectors while export_count is %d\n",
 980                         dev, dev->export_count);
 981                 return -EINVAL;
 982         }
 983         if (!fabric_max_sectors) {
 984                 pr_err("dev[%p]: Illegal ZERO value for"
 985                         " fabric_max_sectors\n", dev);
 986                 return -EINVAL;
 987         }
 988         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
 989                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
 990                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
 991                                 DA_STATUS_MAX_SECTORS_MIN);
 992                 return -EINVAL;
 993         }
 994         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 995                 if (fabric_max_sectors > dev->dev_attrib.hw_max_sectors) {
 996                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
 997                                 " greater than TCM/SE_Device max_sectors:"
 998                                 " %u\n", dev, fabric_max_sectors,
 999                                 dev->dev_attrib.hw_max_sectors);
1000                          return -EINVAL;
1001                 }
1002         } else {
1003                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1004                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1005                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1006                                 " %u\n", dev, fabric_max_sectors,
1007                                 DA_STATUS_MAX_SECTORS_MAX);
1008                         return -EINVAL;
1009                 }
1010         }
1011         /*
1012          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1013          */
1014         if (!block_size) {
1015                 block_size = 512;
1016                 pr_warn("Defaulting to 512 for zero block_size\n");
1017         }
1018         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1019                                                       block_size);
1020
1021         dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1022         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1023                         dev, fabric_max_sectors);
1024         return 0;
1025 }
1026
1027 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1028 {
1029         if (dev->export_count) {
1030                 pr_err("dev[%p]: Unable to change SE Device"
1031                         " optimal_sectors while export_count is %d\n",
1032                         dev, dev->export_count);
1033                 return -EINVAL;
1034         }
1035         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1036                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1037                                 " changed for TCM/pSCSI\n", dev);
1038                 return -EINVAL;
1039         }
1040         if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1041                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1042                         " greater than fabric_max_sectors: %u\n", dev,
1043                         optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1044                 return -EINVAL;
1045         }
1046
1047         dev->dev_attrib.optimal_sectors = optimal_sectors;
1048         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1049                         dev, optimal_sectors);
1050         return 0;
1051 }
1052
1053 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1054 {
1055         if (dev->export_count) {
1056                 pr_err("dev[%p]: Unable to change SE Device block_size"
1057                         " while export_count is %d\n",
1058                         dev, dev->export_count);
1059                 return -EINVAL;
1060         }
1061
1062         if ((block_size != 512) &&
1063             (block_size != 1024) &&
1064             (block_size != 2048) &&
1065             (block_size != 4096)) {
1066                 pr_err("dev[%p]: Illegal value for block_device: %u"
1067                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1068                         dev, block_size);
1069                 return -EINVAL;
1070         }
1071
1072         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1073                 pr_err("dev[%p]: Not allowed to change block_size for"
1074                         " Physical Device, use for Linux/SCSI to change"
1075                         " block_size for underlying hardware\n", dev);
1076                 return -EINVAL;
1077         }
1078
1079         dev->dev_attrib.block_size = block_size;
1080         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1081                         dev, block_size);
1082
1083         if (dev->dev_attrib.max_bytes_per_io)
1084                 dev->dev_attrib.hw_max_sectors =
1085                         dev->dev_attrib.max_bytes_per_io / block_size;
1086
1087         return 0;
1088 }
1089
1090 struct se_lun *core_dev_add_lun(
1091         struct se_portal_group *tpg,
1092         struct se_device *dev,
1093         u32 lun)
1094 {
1095         struct se_lun *lun_p;
1096         int rc;
1097
1098         lun_p = core_tpg_pre_addlun(tpg, lun);
1099         if (IS_ERR(lun_p))
1100                 return lun_p;
1101
1102         rc = core_tpg_post_addlun(tpg, lun_p,
1103                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1104         if (rc < 0)
1105                 return ERR_PTR(rc);
1106
1107         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1108                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1109                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1110                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1111         /*
1112          * Update LUN maps for dynamically added initiators when
1113          * generate_node_acl is enabled.
1114          */
1115         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1116                 struct se_node_acl *acl;
1117                 spin_lock_irq(&tpg->acl_node_lock);
1118                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1119                         if (acl->dynamic_node_acl &&
1120                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1121                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1122                                 spin_unlock_irq(&tpg->acl_node_lock);
1123                                 core_tpg_add_node_to_devs(acl, tpg);
1124                                 spin_lock_irq(&tpg->acl_node_lock);
1125                         }
1126                 }
1127                 spin_unlock_irq(&tpg->acl_node_lock);
1128         }
1129
1130         return lun_p;
1131 }
1132
1133 /*      core_dev_del_lun():
1134  *
1135  *
1136  */
1137 int core_dev_del_lun(
1138         struct se_portal_group *tpg,
1139         u32 unpacked_lun)
1140 {
1141         struct se_lun *lun;
1142
1143         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1144         if (IS_ERR(lun))
1145                 return PTR_ERR(lun);
1146
1147         core_tpg_post_dellun(tpg, lun);
1148
1149         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1150                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1151                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1152                 tpg->se_tpg_tfo->get_fabric_name());
1153
1154         return 0;
1155 }
1156
1157 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1158 {
1159         struct se_lun *lun;
1160
1161         spin_lock(&tpg->tpg_lun_lock);
1162         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1163                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1164                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1165                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1166                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1167                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1168                 spin_unlock(&tpg->tpg_lun_lock);
1169                 return NULL;
1170         }
1171         lun = tpg->tpg_lun_list[unpacked_lun];
1172
1173         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1174                 pr_err("%s Logical Unit Number: %u is not free on"
1175                         " Target Portal Group: %hu, ignoring request.\n",
1176                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1177                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1178                 spin_unlock(&tpg->tpg_lun_lock);
1179                 return NULL;
1180         }
1181         spin_unlock(&tpg->tpg_lun_lock);
1182
1183         return lun;
1184 }
1185
1186 /*      core_dev_get_lun():
1187  *
1188  *
1189  */
1190 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1191 {
1192         struct se_lun *lun;
1193
1194         spin_lock(&tpg->tpg_lun_lock);
1195         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1196                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1197                         "_TPG-1: %u for Target Portal Group: %hu\n",
1198                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1199                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1200                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1201                 spin_unlock(&tpg->tpg_lun_lock);
1202                 return NULL;
1203         }
1204         lun = tpg->tpg_lun_list[unpacked_lun];
1205
1206         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1207                 pr_err("%s Logical Unit Number: %u is not active on"
1208                         " Target Portal Group: %hu, ignoring request.\n",
1209                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1210                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1211                 spin_unlock(&tpg->tpg_lun_lock);
1212                 return NULL;
1213         }
1214         spin_unlock(&tpg->tpg_lun_lock);
1215
1216         return lun;
1217 }
1218
1219 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1220         struct se_portal_group *tpg,
1221         struct se_node_acl *nacl,
1222         u32 mapped_lun,
1223         int *ret)
1224 {
1225         struct se_lun_acl *lacl;
1226
1227         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1228                 pr_err("%s InitiatorName exceeds maximum size.\n",
1229                         tpg->se_tpg_tfo->get_fabric_name());
1230                 *ret = -EOVERFLOW;
1231                 return NULL;
1232         }
1233         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1234         if (!lacl) {
1235                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1236                 *ret = -ENOMEM;
1237                 return NULL;
1238         }
1239
1240         INIT_LIST_HEAD(&lacl->lacl_list);
1241         lacl->mapped_lun = mapped_lun;
1242         lacl->se_lun_nacl = nacl;
1243         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1244                  nacl->initiatorname);
1245
1246         return lacl;
1247 }
1248
1249 int core_dev_add_initiator_node_lun_acl(
1250         struct se_portal_group *tpg,
1251         struct se_lun_acl *lacl,
1252         u32 unpacked_lun,
1253         u32 lun_access)
1254 {
1255         struct se_lun *lun;
1256         struct se_node_acl *nacl;
1257
1258         lun = core_dev_get_lun(tpg, unpacked_lun);
1259         if (!lun) {
1260                 pr_err("%s Logical Unit Number: %u is not active on"
1261                         " Target Portal Group: %hu, ignoring request.\n",
1262                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1263                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1264                 return -EINVAL;
1265         }
1266
1267         nacl = lacl->se_lun_nacl;
1268         if (!nacl)
1269                 return -EINVAL;
1270
1271         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1272             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1273                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1274
1275         lacl->se_lun = lun;
1276
1277         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1278                         lun_access, nacl, tpg) < 0)
1279                 return -EINVAL;
1280
1281         spin_lock(&lun->lun_acl_lock);
1282         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1283         atomic_inc(&lun->lun_acl_count);
1284         smp_mb__after_atomic_inc();
1285         spin_unlock(&lun->lun_acl_lock);
1286
1287         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1288                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1289                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1290                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1291                 lacl->initiatorname);
1292         /*
1293          * Check to see if there are any existing persistent reservation APTPL
1294          * pre-registrations that need to be enabled for this LUN ACL..
1295          */
1296         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
1297                                             lacl->mapped_lun);
1298         return 0;
1299 }
1300
1301 /*      core_dev_del_initiator_node_lun_acl():
1302  *
1303  *
1304  */
1305 int core_dev_del_initiator_node_lun_acl(
1306         struct se_portal_group *tpg,
1307         struct se_lun *lun,
1308         struct se_lun_acl *lacl)
1309 {
1310         struct se_node_acl *nacl;
1311
1312         nacl = lacl->se_lun_nacl;
1313         if (!nacl)
1314                 return -EINVAL;
1315
1316         spin_lock(&lun->lun_acl_lock);
1317         list_del(&lacl->lacl_list);
1318         atomic_dec(&lun->lun_acl_count);
1319         smp_mb__after_atomic_dec();
1320         spin_unlock(&lun->lun_acl_lock);
1321
1322         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1323                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1324
1325         lacl->se_lun = NULL;
1326
1327         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1328                 " InitiatorNode: %s Mapped LUN: %u\n",
1329                 tpg->se_tpg_tfo->get_fabric_name(),
1330                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1331                 lacl->initiatorname, lacl->mapped_lun);
1332
1333         return 0;
1334 }
1335
1336 void core_dev_free_initiator_node_lun_acl(
1337         struct se_portal_group *tpg,
1338         struct se_lun_acl *lacl)
1339 {
1340         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1341                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1342                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1343                 tpg->se_tpg_tfo->get_fabric_name(),
1344                 lacl->initiatorname, lacl->mapped_lun);
1345
1346         kfree(lacl);
1347 }
1348
1349 static void scsi_dump_inquiry(struct se_device *dev)
1350 {
1351         struct t10_wwn *wwn = &dev->t10_wwn;
1352         char buf[17];
1353         int i, device_type;
1354         /*
1355          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1356          */
1357         for (i = 0; i < 8; i++)
1358                 if (wwn->vendor[i] >= 0x20)
1359                         buf[i] = wwn->vendor[i];
1360                 else
1361                         buf[i] = ' ';
1362         buf[i] = '\0';
1363         pr_debug("  Vendor: %s\n", buf);
1364
1365         for (i = 0; i < 16; i++)
1366                 if (wwn->model[i] >= 0x20)
1367                         buf[i] = wwn->model[i];
1368                 else
1369                         buf[i] = ' ';
1370         buf[i] = '\0';
1371         pr_debug("  Model: %s\n", buf);
1372
1373         for (i = 0; i < 4; i++)
1374                 if (wwn->revision[i] >= 0x20)
1375                         buf[i] = wwn->revision[i];
1376                 else
1377                         buf[i] = ' ';
1378         buf[i] = '\0';
1379         pr_debug("  Revision: %s\n", buf);
1380
1381         device_type = dev->transport->get_device_type(dev);
1382         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1383 }
1384
1385 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1386 {
1387         struct se_device *dev;
1388
1389         dev = hba->transport->alloc_device(hba, name);
1390         if (!dev)
1391                 return NULL;
1392
1393         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1394         dev->se_hba = hba;
1395         dev->transport = hba->transport;
1396
1397         INIT_LIST_HEAD(&dev->dev_list);
1398         INIT_LIST_HEAD(&dev->dev_sep_list);
1399         INIT_LIST_HEAD(&dev->dev_tmr_list);
1400         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1401         INIT_LIST_HEAD(&dev->state_list);
1402         INIT_LIST_HEAD(&dev->qf_cmd_list);
1403         spin_lock_init(&dev->stats_lock);
1404         spin_lock_init(&dev->execute_task_lock);
1405         spin_lock_init(&dev->delayed_cmd_lock);
1406         spin_lock_init(&dev->dev_reservation_lock);
1407         spin_lock_init(&dev->se_port_lock);
1408         spin_lock_init(&dev->se_tmr_lock);
1409         spin_lock_init(&dev->qf_cmd_lock);
1410         atomic_set(&dev->dev_ordered_id, 0);
1411         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1412         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1413         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1414         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1415         spin_lock_init(&dev->t10_pr.registration_lock);
1416         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1417         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1418         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1419
1420         dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1421         dev->t10_wwn.t10_dev = dev;
1422         dev->t10_alua.t10_dev = dev;
1423
1424         dev->dev_attrib.da_dev = dev;
1425         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1426         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1427         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1428         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1429         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1430         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1431         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1432         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1433         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1434         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1435         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1436         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1437         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1438         dev->dev_attrib.max_unmap_block_desc_count =
1439                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1440         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1441         dev->dev_attrib.unmap_granularity_alignment =
1442                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1443         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1444         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1445         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1446
1447         return dev;
1448 }
1449
1450 int target_configure_device(struct se_device *dev)
1451 {
1452         struct se_hba *hba = dev->se_hba;
1453         int ret;
1454
1455         if (dev->dev_flags & DF_CONFIGURED) {
1456                 pr_err("se_dev->se_dev_ptr already set for storage"
1457                                 " object\n");
1458                 return -EEXIST;
1459         }
1460
1461         ret = dev->transport->configure_device(dev);
1462         if (ret)
1463                 goto out;
1464         dev->dev_flags |= DF_CONFIGURED;
1465
1466         /*
1467          * XXX: there is not much point to have two different values here..
1468          */
1469         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1470         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1471
1472         /*
1473          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1474          */
1475         dev->dev_attrib.hw_max_sectors =
1476                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1477                                          dev->dev_attrib.hw_block_size);
1478
1479         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1480         dev->creation_time = get_jiffies_64();
1481
1482         ret = core_setup_alua(dev);
1483         if (ret)
1484                 goto out;
1485
1486         /*
1487          * Startup the struct se_device processing thread
1488          */
1489         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1490                                       dev->transport->name);
1491         if (!dev->tmr_wq) {
1492                 pr_err("Unable to create tmr workqueue for %s\n",
1493                         dev->transport->name);
1494                 ret = -ENOMEM;
1495                 goto out_free_alua;
1496         }
1497
1498         /*
1499          * Setup work_queue for QUEUE_FULL
1500          */
1501         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1502
1503         /*
1504          * Preload the initial INQUIRY const values if we are doing
1505          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1506          * passthrough because this is being provided by the backend LLD.
1507          */
1508         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1509                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1510                 strncpy(&dev->t10_wwn.model[0],
1511                         dev->transport->inquiry_prod, 16);
1512                 strncpy(&dev->t10_wwn.revision[0],
1513                         dev->transport->inquiry_rev, 4);
1514         }
1515
1516         scsi_dump_inquiry(dev);
1517
1518         spin_lock(&hba->device_lock);
1519         hba->dev_count++;
1520         spin_unlock(&hba->device_lock);
1521         return 0;
1522
1523 out_free_alua:
1524         core_alua_free_lu_gp_mem(dev);
1525 out:
1526         se_release_vpd_for_dev(dev);
1527         return ret;
1528 }
1529
1530 void target_free_device(struct se_device *dev)
1531 {
1532         struct se_hba *hba = dev->se_hba;
1533
1534         WARN_ON(!list_empty(&dev->dev_sep_list));
1535
1536         if (dev->dev_flags & DF_CONFIGURED) {
1537                 destroy_workqueue(dev->tmr_wq);
1538
1539                 spin_lock(&hba->device_lock);
1540                 hba->dev_count--;
1541                 spin_unlock(&hba->device_lock);
1542         }
1543
1544         core_alua_free_lu_gp_mem(dev);
1545         core_scsi3_free_all_registrations(dev);
1546         se_release_vpd_for_dev(dev);
1547
1548         dev->transport->free_device(dev);
1549 }
1550
1551 int core_dev_setup_virtual_lun0(void)
1552 {
1553         struct se_hba *hba;
1554         struct se_device *dev;
1555         char buf[16];
1556         int ret;
1557
1558         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1559         if (IS_ERR(hba))
1560                 return PTR_ERR(hba);
1561
1562         dev = target_alloc_device(hba, "virt_lun0");
1563         if (!dev) {
1564                 ret = -ENOMEM;
1565                 goto out_free_hba;
1566         }
1567
1568         memset(buf, 0, 16);
1569         sprintf(buf, "rd_pages=8");
1570         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1571
1572         ret = target_configure_device(dev);
1573         if (ret)
1574                 goto out_free_se_dev;
1575
1576         lun0_hba = hba;
1577         g_lun0_dev = dev;
1578         return 0;
1579
1580 out_free_se_dev:
1581         target_free_device(dev);
1582 out_free_hba:
1583         core_delete_hba(hba);
1584         return ret;
1585 }
1586
1587
1588 void core_dev_release_virtual_lun0(void)
1589 {
1590         struct se_hba *hba = lun0_hba;
1591
1592         if (!hba)
1593                 return;
1594
1595         if (g_lun0_dev)
1596                 target_free_device(g_lun0_dev);
1597         core_delete_hba(hba);
1598 }