drivers/target/target_core_device.c

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