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  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
   8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
   9  * Copyright (c) 2007-2010 Rising Tide Systems
  10  * Copyright (c) 2008-2010 Linux-iSCSI.org
  11  *
  12  * Nicholas A. Bellinger <nab@kernel.org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  ******************************************************************************/
  29
  30 #include <linux/net.h>
  31 #include <linux/string.h>
  32 #include <linux/delay.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/export.h>
  39 #include <net/sock.h>
  40 #include <net/tcp.h>
  41 #include <scsi/scsi.h>
  42 #include <scsi/scsi_device.h>
  43
  44 #include <target/target_core_base.h>
  45 #include <target/target_core_backend.h>
  46 #include <target/target_core_fabric.h>
  47
  48 #include "target_core_internal.h"
  49 #include "target_core_alua.h"
  50 #include "target_core_pr.h"
  51 #include "target_core_ua.h"
  52
  53 static struct se_hba *lun0_hba;
  54 /* not static, needed by tpg.c */
  55 struct se_device *g_lun0_dev;
  56
  57 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  58 {
  59         struct se_lun *se_lun = NULL;
  60         struct se_session *se_sess = se_cmd->se_sess;
  61         struct se_device *dev;
  62         unsigned long flags;
  63
  64         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
  65                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
  66                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  67                 return -ENODEV;
  68         }
  69
  70         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  71         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  72         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  73                 struct se_dev_entry *deve = se_cmd->se_deve;
  74
  75                 deve->total_cmds++;
  76                 deve->total_bytes += se_cmd->data_length;
  77
  78                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  79                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  80                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
  81                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
  82                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  83                                 " Access for 0x%08x\n",
  84                                 se_cmd->se_tfo->get_fabric_name(),
  85                                 unpacked_lun);
  86                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  87                         return -EACCES;
  88                 }
  89
  90                 if (se_cmd->data_direction == DMA_TO_DEVICE)
  91                         deve->write_bytes += se_cmd->data_length;
  92                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  93                         deve->read_bytes += se_cmd->data_length;
  94
  95                 deve->deve_cmds++;
  96
  97                 se_lun = deve->se_lun;
  98                 se_cmd->se_lun = deve->se_lun;
  99                 se_cmd->pr_res_key = deve->pr_res_key;
 100                 se_cmd->orig_fe_lun = unpacked_lun;
 101                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 102         }
 103         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 104
 105         if (!se_lun) {
 106                 /*
 107                  * Use the se_portal_group->tpg_virt_lun0 to allow for
 108                  * REPORT_LUNS, et al to be returned when no active
 109                  * MappedLUN=0 exists for this Initiator Port.
 110                  */
 111                 if (unpacked_lun != 0) {
 112                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 113                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 114                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 115                                 " Access for 0x%08x\n",
 116                                 se_cmd->se_tfo->get_fabric_name(),
 117                                 unpacked_lun);
 118                         return -ENODEV;
 119                 }
 120                 /*
 121                  * Force WRITE PROTECT for virtual LUN 0
 122                  */
 123                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 124                     (se_cmd->data_direction != DMA_NONE)) {
 125                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
 126                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 127                         return -EACCES;
 128                 }
 129
 130                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 131                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 132                 se_cmd->orig_fe_lun = 0;
 133                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 134         }
 135
 136         /* Directly associate cmd with se_dev */
 137         se_cmd->se_dev = se_lun->lun_se_dev;
 138
 139         /* TODO: get rid of this and use atomics for stats */
 140         dev = se_lun->lun_se_dev;
 141         spin_lock_irqsave(&dev->stats_lock, flags);
 142         dev->num_cmds++;
 143         if (se_cmd->data_direction == DMA_TO_DEVICE)
 144                 dev->write_bytes += se_cmd->data_length;
 145         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 146                 dev->read_bytes += se_cmd->data_length;
 147         spin_unlock_irqrestore(&dev->stats_lock, flags);
 148
 149         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 150         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 151         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 152
 153         return 0;
 154 }
 155 EXPORT_SYMBOL(transport_lookup_cmd_lun);
 156
 157 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 158 {
 159         struct se_dev_entry *deve;
 160         struct se_lun *se_lun = NULL;
 161         struct se_session *se_sess = se_cmd->se_sess;
 162         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 163         unsigned long flags;
 164
 165         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
 166                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
 167                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 168                 return -ENODEV;
 169         }
 170
 171         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 172         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 173         deve = se_cmd->se_deve;
 174
 175         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 176                 se_tmr->tmr_lun = deve->se_lun;
 177                 se_cmd->se_lun = deve->se_lun;
 178                 se_lun = deve->se_lun;
 179                 se_cmd->pr_res_key = deve->pr_res_key;
 180                 se_cmd->orig_fe_lun = unpacked_lun;
 181         }
 182         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 183
 184         if (!se_lun) {
 185                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 186                         " Access for 0x%08x\n",
 187                         se_cmd->se_tfo->get_fabric_name(),
 188                         unpacked_lun);
 189                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
 190                 return -ENODEV;
 191         }
 192
 193         /* Directly associate cmd with se_dev */
 194         se_cmd->se_dev = se_lun->lun_se_dev;
 195         se_tmr->tmr_dev = se_lun->lun_se_dev;
 196
 197         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 198         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 199         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 200
 201         return 0;
 202 }
 203 EXPORT_SYMBOL(transport_lookup_tmr_lun);
 204
 205 /*
 206  * This function is called from core_scsi3_emulate_pro_register_and_move()
 207  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 208  * when a matching rtpi is found.
 209  */
 210 struct se_dev_entry *core_get_se_deve_from_rtpi(
 211         struct se_node_acl *nacl,
 212         u16 rtpi)
 213 {
 214         struct se_dev_entry *deve;
 215         struct se_lun *lun;
 216         struct se_port *port;
 217         struct se_portal_group *tpg = nacl->se_tpg;
 218         u32 i;
 219
 220         spin_lock_irq(&nacl->device_list_lock);
 221         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 222                 deve = nacl->device_list[i];
 223
 224                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 225                         continue;
 226
 227                 lun = deve->se_lun;
 228                 if (!lun) {
 229                         pr_err("%s device entries device pointer is"
 230                                 " NULL, but Initiator has access.\n",
 231                                 tpg->se_tpg_tfo->get_fabric_name());
 232                         continue;
 233                 }
 234                 port = lun->lun_sep;
 235                 if (!port) {
 236                         pr_err("%s device entries device pointer is"
 237                                 " NULL, but Initiator has access.\n",
 238                                 tpg->se_tpg_tfo->get_fabric_name());
 239                         continue;
 240                 }
 241                 if (port->sep_rtpi != rtpi)
 242                         continue;
 243
 244                 atomic_inc(&deve->pr_ref_count);
 245                 smp_mb__after_atomic_inc();
 246                 spin_unlock_irq(&nacl->device_list_lock);
 247
 248                 return deve;
 249         }
 250         spin_unlock_irq(&nacl->device_list_lock);
 251
 252         return NULL;
 253 }
 254
 255 int core_free_device_list_for_node(
 256         struct se_node_acl *nacl,
 257         struct se_portal_group *tpg)
 258 {
 259         struct se_dev_entry *deve;
 260         struct se_lun *lun;
 261         u32 i;
 262
 263         if (!nacl->device_list)
 264                 return 0;
 265
 266         spin_lock_irq(&nacl->device_list_lock);
 267         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 268                 deve = nacl->device_list[i];
 269
 270                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 271                         continue;
 272
 273                 if (!deve->se_lun) {
 274                         pr_err("%s device entries device pointer is"
 275                                 " NULL, but Initiator has access.\n",
 276                                 tpg->se_tpg_tfo->get_fabric_name());
 277                         continue;
 278                 }
 279                 lun = deve->se_lun;
 280
 281                 spin_unlock_irq(&nacl->device_list_lock);
 282                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 283                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 284                 spin_lock_irq(&nacl->device_list_lock);
 285         }
 286         spin_unlock_irq(&nacl->device_list_lock);
 287
 288         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 289         nacl->device_list = NULL;
 290
 291         return 0;
 292 }
 293
 294 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 295 {
 296         struct se_dev_entry *deve;
 297         unsigned long flags;
 298
 299         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 300         deve = se_nacl->device_list[se_cmd->orig_fe_lun];
 301         deve->deve_cmds--;
 302         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 303 }
 304
 305 void core_update_device_list_access(
 306         u32 mapped_lun,
 307         u32 lun_access,
 308         struct se_node_acl *nacl)
 309 {
 310         struct se_dev_entry *deve;
 311
 312         spin_lock_irq(&nacl->device_list_lock);
 313         deve = nacl->device_list[mapped_lun];
 314         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 315                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 316                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 317         } else {
 318                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 319                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 320         }
 321         spin_unlock_irq(&nacl->device_list_lock);
 322 }
 323
 324 /*      core_enable_device_list_for_node():
 325  *
 326  *
 327  */
 328 int core_enable_device_list_for_node(
 329         struct se_lun *lun,
 330         struct se_lun_acl *lun_acl,
 331         u32 mapped_lun,
 332         u32 lun_access,
 333         struct se_node_acl *nacl,
 334         struct se_portal_group *tpg)
 335 {
 336         struct se_port *port = lun->lun_sep;
 337         struct se_dev_entry *deve;
 338
 339         spin_lock_irq(&nacl->device_list_lock);
 340
 341         deve = nacl->device_list[mapped_lun];
 342
 343         /*
 344          * Check if the call is handling demo mode -> explict LUN ACL
 345          * transition.  This transition must be for the same struct se_lun
 346          * + mapped_lun that was setup in demo mode..
 347          */
 348         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 349                 if (deve->se_lun_acl != NULL) {
 350                         pr_err("struct se_dev_entry->se_lun_acl"
 351                                " already set for demo mode -> explict"
 352                                " LUN ACL transition\n");
 353                         spin_unlock_irq(&nacl->device_list_lock);
 354                         return -EINVAL;
 355                 }
 356                 if (deve->se_lun != lun) {
 357                         pr_err("struct se_dev_entry->se_lun does"
 358                                " match passed struct se_lun for demo mode"
 359                                " -> explict LUN ACL transition\n");
 360                         spin_unlock_irq(&nacl->device_list_lock);
 361                         return -EINVAL;
 362                 }
 363                 deve->se_lun_acl = lun_acl;
 364
 365                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 366                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 367                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 368                 } else {
 369                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 370                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 371                 }
 372
 373                 spin_unlock_irq(&nacl->device_list_lock);
 374                 return 0;
 375         }
 376
 377         deve->se_lun = lun;
 378         deve->se_lun_acl = lun_acl;
 379         deve->mapped_lun = mapped_lun;
 380         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 381
 382         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 383                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 384                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 385         } else {
 386                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 387                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 388         }
 389
 390         deve->creation_time = get_jiffies_64();
 391         deve->attach_count++;
 392         spin_unlock_irq(&nacl->device_list_lock);
 393
 394         spin_lock_bh(&port->sep_alua_lock);
 395         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 396         spin_unlock_bh(&port->sep_alua_lock);
 397
 398         return 0;
 399 }
 400
 401 /*      core_disable_device_list_for_node():
 402  *
 403  *
 404  */
 405 int core_disable_device_list_for_node(
 406         struct se_lun *lun,
 407         struct se_lun_acl *lun_acl,
 408         u32 mapped_lun,
 409         u32 lun_access,
 410         struct se_node_acl *nacl,
 411         struct se_portal_group *tpg)
 412 {
 413         struct se_port *port = lun->lun_sep;
 414         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 415
 416         /*
 417          * If the MappedLUN entry is being disabled, the entry in
 418          * port->sep_alua_list must be removed now before clearing the
 419          * struct se_dev_entry pointers below as logic in
 420          * core_alua_do_transition_tg_pt() depends on these being present.
 421          *
 422          * deve->se_lun_acl will be NULL for demo-mode created LUNs
 423          * that have not been explicitly converted to MappedLUNs ->
 424          * struct se_lun_acl, but we remove deve->alua_port_list from
 425          * port->sep_alua_list. This also means that active UAs and
 426          * NodeACL context specific PR metadata for demo-mode
 427          * MappedLUN *deve will be released below..
 428          */
 429         spin_lock_bh(&port->sep_alua_lock);
 430         list_del(&deve->alua_port_list);
 431         spin_unlock_bh(&port->sep_alua_lock);
 432         /*
 433          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 434          * PR operation to complete.
 435          */
 436         while (atomic_read(&deve->pr_ref_count) != 0)
 437                 cpu_relax();
 438
 439         spin_lock_irq(&nacl->device_list_lock);
 440         /*
 441          * Disable struct se_dev_entry LUN ACL mapping
 442          */
 443         core_scsi3_ua_release_all(deve);
 444         deve->se_lun = NULL;
 445         deve->se_lun_acl = NULL;
 446         deve->lun_flags = 0;
 447         deve->creation_time = 0;
 448         deve->attach_count--;
 449         spin_unlock_irq(&nacl->device_list_lock);
 450
 451         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 452         return 0;
 453 }
 454
 455 /*      core_clear_lun_from_tpg():
 456  *
 457  *
 458  */
 459 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 460 {
 461         struct se_node_acl *nacl;
 462         struct se_dev_entry *deve;
 463         u32 i;
 464
 465         spin_lock_irq(&tpg->acl_node_lock);
 466         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 467                 spin_unlock_irq(&tpg->acl_node_lock);
 468
 469                 spin_lock_irq(&nacl->device_list_lock);
 470                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 471                         deve = nacl->device_list[i];
 472                         if (lun != deve->se_lun)
 473                                 continue;
 474                         spin_unlock_irq(&nacl->device_list_lock);
 475
 476                         core_disable_device_list_for_node(lun, NULL,
 477                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 478                                 nacl, tpg);
 479
 480                         spin_lock_irq(&nacl->device_list_lock);
 481                 }
 482                 spin_unlock_irq(&nacl->device_list_lock);
 483
 484                 spin_lock_irq(&tpg->acl_node_lock);
 485         }
 486         spin_unlock_irq(&tpg->acl_node_lock);
 487 }
 488
 489 static struct se_port *core_alloc_port(struct se_device *dev)
 490 {
 491         struct se_port *port, *port_tmp;
 492
 493         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 494         if (!port) {
 495                 pr_err("Unable to allocate struct se_port\n");
 496                 return ERR_PTR(-ENOMEM);
 497         }
 498         INIT_LIST_HEAD(&port->sep_alua_list);
 499         INIT_LIST_HEAD(&port->sep_list);
 500         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 501         spin_lock_init(&port->sep_alua_lock);
 502         mutex_init(&port->sep_tg_pt_md_mutex);
 503
 504         spin_lock(&dev->se_port_lock);
 505         if (dev->dev_port_count == 0x0000ffff) {
 506                 pr_warn("Reached dev->dev_port_count =="
 507                                 " 0x0000ffff\n");
 508                 spin_unlock(&dev->se_port_lock);
 509                 return ERR_PTR(-ENOSPC);
 510         }
 511 again:
 512         /*
 513          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 514          * Here is the table from spc4r17 section 7.7.3.8.
 515          *
 516          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 517          *
 518          * Code      Description
 519          * 0h        Reserved
 520          * 1h        Relative port 1, historically known as port A
 521          * 2h        Relative port 2, historically known as port B
 522          * 3h to FFFFh    Relative port 3 through 65 535
 523          */
 524         port->sep_rtpi = dev->dev_rpti_counter++;
 525         if (!port->sep_rtpi)
 526                 goto again;
 527
 528         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 529                 /*
 530                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 531                  * for 16-bit wrap..
 532                  */
 533                 if (port->sep_rtpi == port_tmp->sep_rtpi)
 534                         goto again;
 535         }
 536         spin_unlock(&dev->se_port_lock);
 537
 538         return port;
 539 }
 540
 541 static void core_export_port(
 542         struct se_device *dev,
 543         struct se_portal_group *tpg,
 544         struct se_port *port,
 545         struct se_lun *lun)
 546 {
 547         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 548
 549         spin_lock(&dev->se_port_lock);
 550         spin_lock(&lun->lun_sep_lock);
 551         port->sep_tpg = tpg;
 552         port->sep_lun = lun;
 553         lun->lun_sep = port;
 554         spin_unlock(&lun->lun_sep_lock);
 555
 556         list_add_tail(&port->sep_list, &dev->dev_sep_list);
 557         spin_unlock(&dev->se_port_lock);
 558
 559         if (dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
 560                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 561                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 562                         pr_err("Unable to allocate t10_alua_tg_pt"
 563                                         "_gp_member_t\n");
 564                         return;
 565                 }
 566                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 567                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 568                         dev->t10_alua.default_tg_pt_gp);
 569                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 570                 pr_debug("%s/%s: Adding to default ALUA Target Port"
 571                         " Group: alua/default_tg_pt_gp\n",
 572                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 573         }
 574
 575         dev->dev_port_count++;
 576         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 577 }
 578
 579 /*
 580  *      Called with struct se_device->se_port_lock spinlock held.
 581  */
 582 static void core_release_port(struct se_device *dev, struct se_port *port)
 583         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 584 {
 585         /*
 586          * Wait for any port reference for PR ALL_TG_PT=1 operation
 587          * to complete in __core_scsi3_alloc_registration()
 588          */
 589         spin_unlock(&dev->se_port_lock);
 590         if (atomic_read(&port->sep_tg_pt_ref_cnt))
 591                 cpu_relax();
 592         spin_lock(&dev->se_port_lock);
 593
 594         core_alua_free_tg_pt_gp_mem(port);
 595
 596         list_del(&port->sep_list);
 597         dev->dev_port_count--;
 598         kfree(port);
 599 }
 600
 601 int core_dev_export(
 602         struct se_device *dev,
 603         struct se_portal_group *tpg,
 604         struct se_lun *lun)
 605 {
 606         struct se_hba *hba = dev->se_hba;
 607         struct se_port *port;
 608
 609         port = core_alloc_port(dev);
 610         if (IS_ERR(port))
 611                 return PTR_ERR(port);
 612
 613         lun->lun_se_dev = dev;
 614
 615         spin_lock(&hba->device_lock);
 616         dev->export_count++;
 617         spin_unlock(&hba->device_lock);
 618
 619         core_export_port(dev, tpg, port, lun);
 620         return 0;
 621 }
 622
 623 void core_dev_unexport(
 624         struct se_device *dev,
 625         struct se_portal_group *tpg,
 626         struct se_lun *lun)
 627 {
 628         struct se_hba *hba = dev->se_hba;
 629         struct se_port *port = lun->lun_sep;
 630
 631         spin_lock(&lun->lun_sep_lock);
 632         if (lun->lun_se_dev == NULL) {
 633                 spin_unlock(&lun->lun_sep_lock);
 634                 return;
 635         }
 636         spin_unlock(&lun->lun_sep_lock);
 637
 638         spin_lock(&dev->se_port_lock);
 639         core_release_port(dev, port);
 640         spin_unlock(&dev->se_port_lock);
 641
 642         spin_lock(&hba->device_lock);
 643         dev->export_count--;
 644         spin_unlock(&hba->device_lock);
 645
 646         lun->lun_se_dev = NULL;
 647 }
 648
 649 int target_report_luns(struct se_cmd *se_cmd)
 650 {
 651         struct se_dev_entry *deve;
 652         struct se_session *se_sess = se_cmd->se_sess;
 653         unsigned char *buf;
 654         u32 lun_count = 0, offset = 8, i;
 655
 656         if (se_cmd->data_length < 16) {
 657                 pr_warn("REPORT LUNS allocation length %u too small\n",
 658                         se_cmd->data_length);
 659                 se_cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 660                 return -EINVAL;
 661         }
 662
 663         buf = transport_kmap_data_sg(se_cmd);
 664         if (!buf)
 665                 return -ENOMEM;
 666
 667         /*
 668          * If no struct se_session pointer is present, this struct se_cmd is
 669          * coming via a target_core_mod PASSTHROUGH op, and not through
 670          * a $FABRIC_MOD.  In that case, report LUN=0 only.
 671          */
 672         if (!se_sess) {
 673                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
 674                 lun_count = 1;
 675                 goto done;
 676         }
 677
 678         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
 679         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 680                 deve = se_sess->se_node_acl->device_list[i];
 681                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 682                         continue;
 683                 /*
 684                  * We determine the correct LUN LIST LENGTH even once we
 685                  * have reached the initial allocation length.
 686                  * See SPC2-R20 7.19.
 687                  */
 688                 lun_count++;
 689                 if ((offset + 8) > se_cmd->data_length)
 690                         continue;
 691
 692                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
 693                 offset += 8;
 694         }
 695         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
 696
 697         /*
 698          * See SPC3 r07, page 159.
 699          */
 700 done:
 701         lun_count *= 8;
 702         buf[0] = ((lun_count >> 24) & 0xff);
 703         buf[1] = ((lun_count >> 16) & 0xff);
 704         buf[2] = ((lun_count >> 8) & 0xff);
 705         buf[3] = (lun_count & 0xff);
 706         transport_kunmap_data_sg(se_cmd);
 707
 708         target_complete_cmd(se_cmd, GOOD);
 709         return 0;
 710 }
 711
 712 static void se_release_vpd_for_dev(struct se_device *dev)
 713 {
 714         struct t10_vpd *vpd, *vpd_tmp;
 715
 716         spin_lock(&dev->t10_wwn.t10_vpd_lock);
 717         list_for_each_entry_safe(vpd, vpd_tmp,
 718                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
 719                 list_del(&vpd->vpd_list);
 720                 kfree(vpd);
 721         }
 722         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 723 }
 724
 725 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 726 {
 727         u32 aligned_max_sectors;
 728         u32 alignment;
 729         /*
 730          * Limit max_sectors to a PAGE_SIZE aligned value for modern
 731          * transport_allocate_data_tasks() operation.
 732          */
 733         alignment = max(1ul, PAGE_SIZE / block_size);
 734         aligned_max_sectors = rounddown(max_sectors, alignment);
 735
 736         if (max_sectors != aligned_max_sectors)
 737                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
 738                         max_sectors, aligned_max_sectors);
 739
 740         return aligned_max_sectors;
 741 }
 742
 743 int se_dev_set_max_unmap_lba_count(
 744         struct se_device *dev,
 745         u32 max_unmap_lba_count)
 746 {
 747         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 748         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 749                         dev, dev->dev_attrib.max_unmap_lba_count);
 750         return 0;
 751 }
 752
 753 int se_dev_set_max_unmap_block_desc_count(
 754         struct se_device *dev,
 755         u32 max_unmap_block_desc_count)
 756 {
 757         dev->dev_attrib.max_unmap_block_desc_count =
 758                 max_unmap_block_desc_count;
 759         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 760                         dev, dev->dev_attrib.max_unmap_block_desc_count);
 761         return 0;
 762 }
 763
 764 int se_dev_set_unmap_granularity(
 765         struct se_device *dev,
 766         u32 unmap_granularity)
 767 {
 768         dev->dev_attrib.unmap_granularity = unmap_granularity;
 769         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 770                         dev, dev->dev_attrib.unmap_granularity);
 771         return 0;
 772 }
 773
 774 int se_dev_set_unmap_granularity_alignment(
 775         struct se_device *dev,
 776         u32 unmap_granularity_alignment)
 777 {
 778         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 779         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 780                         dev, dev->dev_attrib.unmap_granularity_alignment);
 781         return 0;
 782 }
 783
 784 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 785 {
 786         if (flag != 0 && flag != 1) {
 787                 pr_err("Illegal value %d\n", flag);
 788                 return -EINVAL;
 789         }
 790
 791         if (flag) {
 792                 pr_err("dpo_emulated not supported\n");
 793                 return -EINVAL;
 794         }
 795
 796         return 0;
 797 }
 798
 799 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 800 {
 801         if (flag != 0 && flag != 1) {
 802                 pr_err("Illegal value %d\n", flag);
 803                 return -EINVAL;
 804         }
 805
 806         if (flag &&
 807             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 808                 pr_err("emulate_fua_write not supported for pSCSI\n");
 809                 return -EINVAL;
 810         }
 811         dev->dev_attrib.emulate_fua_write = flag;
 812         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 813                         dev, dev->dev_attrib.emulate_fua_write);
 814         return 0;
 815 }
 816
 817 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 818 {
 819         if (flag != 0 && flag != 1) {
 820                 pr_err("Illegal value %d\n", flag);
 821                 return -EINVAL;
 822         }
 823
 824         if (flag) {
 825                 pr_err("ua read emulated not supported\n");
 826                 return -EINVAL;
 827         }
 828
 829         return 0;
 830 }
 831
 832 int se_dev_set_emulate_write_cache(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         if (flag &&
 839             dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 840                 pr_err("emulate_write_cache not supported for pSCSI\n");
 841                 return -EINVAL;
 842         }
 843         dev->dev_attrib.emulate_write_cache = flag;
 844         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 845                         dev, dev->dev_attrib.emulate_write_cache);
 846         return 0;
 847 }
 848
 849 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 850 {
 851         if ((flag != 0) && (flag != 1) && (flag != 2)) {
 852                 pr_err("Illegal value %d\n", flag);
 853                 return -EINVAL;
 854         }
 855
 856         if (dev->export_count) {
 857                 pr_err("dev[%p]: Unable to change SE Device"
 858                         " UA_INTRLCK_CTRL while export_count is %d\n",
 859                         dev, dev->export_count);
 860                 return -EINVAL;
 861         }
 862         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 863         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 864                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 865
 866         return 0;
 867 }
 868
 869 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 870 {
 871         if ((flag != 0) && (flag != 1)) {
 872                 pr_err("Illegal value %d\n", flag);
 873                 return -EINVAL;
 874         }
 875
 876         if (dev->export_count) {
 877                 pr_err("dev[%p]: Unable to change SE Device TAS while"
 878                         " export_count is %d\n",
 879                         dev, dev->export_count);
 880                 return -EINVAL;
 881         }
 882         dev->dev_attrib.emulate_tas = flag;
 883         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 884                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 885
 886         return 0;
 887 }
 888
 889 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 890 {
 891         if ((flag != 0) && (flag != 1)) {
 892                 pr_err("Illegal value %d\n", flag);
 893                 return -EINVAL;
 894         }
 895         /*
 896          * We expect this value to be non-zero when generic Block Layer
 897          * Discard supported is detected iblock_create_virtdevice().
 898          */
 899         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 900                 pr_err("Generic Block Discard not supported\n");
 901                 return -ENOSYS;
 902         }
 903
 904         dev->dev_attrib.emulate_tpu = flag;
 905         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 906                                 dev, flag);
 907         return 0;
 908 }
 909
 910 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 911 {
 912         if ((flag != 0) && (flag != 1)) {
 913                 pr_err("Illegal value %d\n", flag);
 914                 return -EINVAL;
 915         }
 916         /*
 917          * We expect this value to be non-zero when generic Block Layer
 918          * Discard supported is detected iblock_create_virtdevice().
 919          */
 920         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 921                 pr_err("Generic Block Discard not supported\n");
 922                 return -ENOSYS;
 923         }
 924
 925         dev->dev_attrib.emulate_tpws = flag;
 926         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 927                                 dev, flag);
 928         return 0;
 929 }
 930
 931 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
 932 {
 933         if ((flag != 0) && (flag != 1)) {
 934                 pr_err("Illegal value %d\n", flag);
 935                 return -EINVAL;
 936         }
 937         dev->dev_attrib.enforce_pr_isids = flag;
 938         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
 939                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
 940         return 0;
 941 }
 942
 943 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
 944 {
 945         if ((flag != 0) && (flag != 1)) {
 946                 printk(KERN_ERR "Illegal value %d\n", flag);
 947                 return -EINVAL;
 948         }
 949         dev->dev_attrib.is_nonrot = flag;
 950         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
 951                dev, flag);
 952         return 0;
 953 }
 954
 955 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
 956 {
 957         if (flag != 0) {
 958                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
 959                         " reordering not implemented\n", dev);
 960                 return -ENOSYS;
 961         }
 962         dev->dev_attrib.emulate_rest_reord = flag;
 963         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
 964         return 0;
 965 }
 966
 967 /*
 968  * Note, this can only be called on unexported SE Device Object.
 969  */
 970 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
 971 {
 972         if (dev->export_count) {
 973                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
 974                         " export_count is %d\n",
 975                         dev, dev->export_count);
 976                 return -EINVAL;
 977         }
 978         if (!queue_depth) {
 979                 pr_err("dev[%p]: Illegal ZERO value for queue"
 980                         "_depth\n", dev);
 981                 return -EINVAL;
 982         }
 983
 984         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 985                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 986                         pr_err("dev[%p]: Passed queue_depth: %u"
 987                                 " exceeds TCM/SE_Device TCQ: %u\n",
 988                                 dev, queue_depth,
 989                                 dev->dev_attrib.hw_queue_depth);
 990                         return -EINVAL;
 991                 }
 992         } else {
 993                 if (queue_depth > dev->dev_attrib.queue_depth) {
 994                         if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 995                                 pr_err("dev[%p]: Passed queue_depth:"
 996                                         " %u exceeds TCM/SE_Device MAX"
 997                                         " TCQ: %u\n", dev, queue_depth,
 998                                         dev->dev_attrib.hw_queue_depth);
 999                                 return -EINVAL;
1000                         }
1001                 }
1002         }
1003
1004         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1005         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1006                         dev, queue_depth);
1007         return 0;
1008 }
1009
1010 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1011 {
1012         if (dev->export_count) {
1013                 pr_err("dev[%p]: Unable to change SE Device"
1014                         " fabric_max_sectors while export_count is %d\n",
1015                         dev, dev->export_count);
1016                 return -EINVAL;
1017         }
1018         if (!fabric_max_sectors) {
1019                 pr_err("dev[%p]: Illegal ZERO value for"
1020                         " fabric_max_sectors\n", dev);
1021                 return -EINVAL;
1022         }
1023         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1024                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1025                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1026                                 DA_STATUS_MAX_SECTORS_MIN);
1027                 return -EINVAL;
1028         }
1029         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1030                 if (fabric_max_sectors > dev->dev_attrib.hw_max_sectors) {
1031                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1032                                 " greater than TCM/SE_Device max_sectors:"
1033                                 " %u\n", dev, fabric_max_sectors,
1034                                 dev->dev_attrib.hw_max_sectors);
1035                          return -EINVAL;
1036                 }
1037         } else {
1038                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1039                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1040                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1041                                 " %u\n", dev, fabric_max_sectors,
1042                                 DA_STATUS_MAX_SECTORS_MAX);
1043                         return -EINVAL;
1044                 }
1045         }
1046         /*
1047          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1048          */
1049         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1050                                                       dev->dev_attrib.block_size);
1051
1052         dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1053         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1054                         dev, fabric_max_sectors);
1055         return 0;
1056 }
1057
1058 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1059 {
1060         if (dev->export_count) {
1061                 pr_err("dev[%p]: Unable to change SE Device"
1062                         " optimal_sectors while export_count is %d\n",
1063                         dev, dev->export_count);
1064                 return -EINVAL;
1065         }
1066         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1067                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1068                                 " changed for TCM/pSCSI\n", dev);
1069                 return -EINVAL;
1070         }
1071         if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1072                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1073                         " greater than fabric_max_sectors: %u\n", dev,
1074                         optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1075                 return -EINVAL;
1076         }
1077
1078         dev->dev_attrib.optimal_sectors = optimal_sectors;
1079         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1080                         dev, optimal_sectors);
1081         return 0;
1082 }
1083
1084 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1085 {
1086         if (dev->export_count) {
1087                 pr_err("dev[%p]: Unable to change SE Device block_size"
1088                         " while export_count is %d\n",
1089                         dev, dev->export_count);
1090                 return -EINVAL;
1091         }
1092
1093         if ((block_size != 512) &&
1094             (block_size != 1024) &&
1095             (block_size != 2048) &&
1096             (block_size != 4096)) {
1097                 pr_err("dev[%p]: Illegal value for block_device: %u"
1098                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1099                         dev, block_size);
1100                 return -EINVAL;
1101         }
1102
1103         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1104                 pr_err("dev[%p]: Not allowed to change block_size for"
1105                         " Physical Device, use for Linux/SCSI to change"
1106                         " block_size for underlying hardware\n", dev);
1107                 return -EINVAL;
1108         }
1109
1110         dev->dev_attrib.block_size = block_size;
1111         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1112                         dev, block_size);
1113         return 0;
1114 }
1115
1116 struct se_lun *core_dev_add_lun(
1117         struct se_portal_group *tpg,
1118         struct se_device *dev,
1119         u32 lun)
1120 {
1121         struct se_lun *lun_p;
1122         int rc;
1123
1124         lun_p = core_tpg_pre_addlun(tpg, lun);
1125         if (IS_ERR(lun_p))
1126                 return lun_p;
1127
1128         rc = core_tpg_post_addlun(tpg, lun_p,
1129                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1130         if (rc < 0)
1131                 return ERR_PTR(rc);
1132
1133         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1134                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1135                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1136                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1137         /*
1138          * Update LUN maps for dynamically added initiators when
1139          * generate_node_acl is enabled.
1140          */
1141         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1142                 struct se_node_acl *acl;
1143                 spin_lock_irq(&tpg->acl_node_lock);
1144                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1145                         if (acl->dynamic_node_acl &&
1146                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1147                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1148                                 spin_unlock_irq(&tpg->acl_node_lock);
1149                                 core_tpg_add_node_to_devs(acl, tpg);
1150                                 spin_lock_irq(&tpg->acl_node_lock);
1151                         }
1152                 }
1153                 spin_unlock_irq(&tpg->acl_node_lock);
1154         }
1155
1156         return lun_p;
1157 }
1158
1159 /*      core_dev_del_lun():
1160  *
1161  *
1162  */
1163 int core_dev_del_lun(
1164         struct se_portal_group *tpg,
1165         u32 unpacked_lun)
1166 {
1167         struct se_lun *lun;
1168
1169         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1170         if (IS_ERR(lun))
1171                 return PTR_ERR(lun);
1172
1173         core_tpg_post_dellun(tpg, lun);
1174
1175         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1176                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1177                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1178                 tpg->se_tpg_tfo->get_fabric_name());
1179
1180         return 0;
1181 }
1182
1183 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1184 {
1185         struct se_lun *lun;
1186
1187         spin_lock(&tpg->tpg_lun_lock);
1188         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1189                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1190                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1191                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1192                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1193                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1194                 spin_unlock(&tpg->tpg_lun_lock);
1195                 return NULL;
1196         }
1197         lun = tpg->tpg_lun_list[unpacked_lun];
1198
1199         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1200                 pr_err("%s Logical Unit Number: %u is not free on"
1201                         " Target Portal Group: %hu, ignoring request.\n",
1202                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1203                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1204                 spin_unlock(&tpg->tpg_lun_lock);
1205                 return NULL;
1206         }
1207         spin_unlock(&tpg->tpg_lun_lock);
1208
1209         return lun;
1210 }
1211
1212 /*      core_dev_get_lun():
1213  *
1214  *
1215  */
1216 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1217 {
1218         struct se_lun *lun;
1219
1220         spin_lock(&tpg->tpg_lun_lock);
1221         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1222                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1223                         "_TPG-1: %u for Target Portal Group: %hu\n",
1224                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1225                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1226                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1227                 spin_unlock(&tpg->tpg_lun_lock);
1228                 return NULL;
1229         }
1230         lun = tpg->tpg_lun_list[unpacked_lun];
1231
1232         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1233                 pr_err("%s Logical Unit Number: %u is not active on"
1234                         " Target Portal Group: %hu, ignoring request.\n",
1235                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1236                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1237                 spin_unlock(&tpg->tpg_lun_lock);
1238                 return NULL;
1239         }
1240         spin_unlock(&tpg->tpg_lun_lock);
1241
1242         return lun;
1243 }
1244
1245 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1246         struct se_portal_group *tpg,
1247         u32 mapped_lun,
1248         char *initiatorname,
1249         int *ret)
1250 {
1251         struct se_lun_acl *lacl;
1252         struct se_node_acl *nacl;
1253
1254         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1255                 pr_err("%s InitiatorName exceeds maximum size.\n",
1256                         tpg->se_tpg_tfo->get_fabric_name());
1257                 *ret = -EOVERFLOW;
1258                 return NULL;
1259         }
1260         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1261         if (!nacl) {
1262                 *ret = -EINVAL;
1263                 return NULL;
1264         }
1265         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1266         if (!lacl) {
1267                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1268                 *ret = -ENOMEM;
1269                 return NULL;
1270         }
1271
1272         INIT_LIST_HEAD(&lacl->lacl_list);
1273         lacl->mapped_lun = mapped_lun;
1274         lacl->se_lun_nacl = nacl;
1275         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1276
1277         return lacl;
1278 }
1279
1280 int core_dev_add_initiator_node_lun_acl(
1281         struct se_portal_group *tpg,
1282         struct se_lun_acl *lacl,
1283         u32 unpacked_lun,
1284         u32 lun_access)
1285 {
1286         struct se_lun *lun;
1287         struct se_node_acl *nacl;
1288
1289         lun = core_dev_get_lun(tpg, unpacked_lun);
1290         if (!lun) {
1291                 pr_err("%s Logical Unit Number: %u is not active on"
1292                         " Target Portal Group: %hu, ignoring request.\n",
1293                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1294                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1295                 return -EINVAL;
1296         }
1297
1298         nacl = lacl->se_lun_nacl;
1299         if (!nacl)
1300                 return -EINVAL;
1301
1302         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1303             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1304                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1305
1306         lacl->se_lun = lun;
1307
1308         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1309                         lun_access, nacl, tpg) < 0)
1310                 return -EINVAL;
1311
1312         spin_lock(&lun->lun_acl_lock);
1313         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1314         atomic_inc(&lun->lun_acl_count);
1315         smp_mb__after_atomic_inc();
1316         spin_unlock(&lun->lun_acl_lock);
1317
1318         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1319                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1320                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1321                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1322                 lacl->initiatorname);
1323         /*
1324          * Check to see if there are any existing persistent reservation APTPL
1325          * pre-registrations that need to be enabled for this LUN ACL..
1326          */
1327         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1328         return 0;
1329 }
1330
1331 /*      core_dev_del_initiator_node_lun_acl():
1332  *
1333  *
1334  */
1335 int core_dev_del_initiator_node_lun_acl(
1336         struct se_portal_group *tpg,
1337         struct se_lun *lun,
1338         struct se_lun_acl *lacl)
1339 {
1340         struct se_node_acl *nacl;
1341
1342         nacl = lacl->se_lun_nacl;
1343         if (!nacl)
1344                 return -EINVAL;
1345
1346         spin_lock(&lun->lun_acl_lock);
1347         list_del(&lacl->lacl_list);
1348         atomic_dec(&lun->lun_acl_count);
1349         smp_mb__after_atomic_dec();
1350         spin_unlock(&lun->lun_acl_lock);
1351
1352         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1353                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1354
1355         lacl->se_lun = NULL;
1356
1357         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1358                 " InitiatorNode: %s Mapped LUN: %u\n",
1359                 tpg->se_tpg_tfo->get_fabric_name(),
1360                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1361                 lacl->initiatorname, lacl->mapped_lun);
1362
1363         return 0;
1364 }
1365
1366 void core_dev_free_initiator_node_lun_acl(
1367         struct se_portal_group *tpg,
1368         struct se_lun_acl *lacl)
1369 {
1370         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1371                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1372                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1373                 tpg->se_tpg_tfo->get_fabric_name(),
1374                 lacl->initiatorname, lacl->mapped_lun);
1375
1376         kfree(lacl);
1377 }
1378
1379 static void scsi_dump_inquiry(struct se_device *dev)
1380 {
1381         struct t10_wwn *wwn = &dev->t10_wwn;
1382         char buf[17];
1383         int i, device_type;
1384         /*
1385          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1386          */
1387         for (i = 0; i < 8; i++)
1388                 if (wwn->vendor[i] >= 0x20)
1389                         buf[i] = wwn->vendor[i];
1390                 else
1391                         buf[i] = ' ';
1392         buf[i] = '\0';
1393         pr_debug("  Vendor: %s\n", buf);
1394
1395         for (i = 0; i < 16; i++)
1396                 if (wwn->model[i] >= 0x20)
1397                         buf[i] = wwn->model[i];
1398                 else
1399                         buf[i] = ' ';
1400         buf[i] = '\0';
1401         pr_debug("  Model: %s\n", buf);
1402
1403         for (i = 0; i < 4; i++)
1404                 if (wwn->revision[i] >= 0x20)
1405                         buf[i] = wwn->revision[i];
1406                 else
1407                         buf[i] = ' ';
1408         buf[i] = '\0';
1409         pr_debug("  Revision: %s\n", buf);
1410
1411         device_type = dev->transport->get_device_type(dev);
1412         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1413         pr_debug("                 ANSI SCSI revision: %02x\n",
1414                                 dev->transport->get_device_rev(dev));
1415 }
1416
1417 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1418 {
1419         struct se_device *dev;
1420
1421         dev = hba->transport->alloc_device(hba, name);
1422         if (!dev)
1423                 return NULL;
1424
1425         dev->se_hba = hba;
1426         dev->transport = hba->transport;
1427
1428         INIT_LIST_HEAD(&dev->dev_list);
1429         INIT_LIST_HEAD(&dev->dev_sep_list);
1430         INIT_LIST_HEAD(&dev->dev_tmr_list);
1431         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1432         INIT_LIST_HEAD(&dev->state_list);
1433         INIT_LIST_HEAD(&dev->qf_cmd_list);
1434         spin_lock_init(&dev->stats_lock);
1435         spin_lock_init(&dev->execute_task_lock);
1436         spin_lock_init(&dev->delayed_cmd_lock);
1437         spin_lock_init(&dev->dev_reservation_lock);
1438         spin_lock_init(&dev->se_port_lock);
1439         spin_lock_init(&dev->se_tmr_lock);
1440         spin_lock_init(&dev->qf_cmd_lock);
1441         atomic_set(&dev->dev_ordered_id, 0);
1442         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1443         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1444         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1445         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1446         spin_lock_init(&dev->t10_pr.registration_lock);
1447         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1448         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1449         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1450
1451         dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1452         dev->t10_wwn.t10_dev = dev;
1453         dev->t10_alua.t10_dev = dev;
1454
1455         dev->dev_attrib.da_dev = dev;
1456         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1457         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1458         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1459         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1460         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1461         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1462         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1463         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1464         dev->dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
1465         dev->dev_attrib.emulate_alua = DA_EMULATE_ALUA;
1466         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1467         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1468         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1469         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1470         dev->dev_attrib.max_unmap_block_desc_count =
1471                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1472         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1473         dev->dev_attrib.unmap_granularity_alignment =
1474                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1475         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1476         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1477
1478         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1479                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1480         else
1481                 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1482
1483         return dev;
1484 }
1485
1486 int target_configure_device(struct se_device *dev)
1487 {
1488         struct se_hba *hba = dev->se_hba;
1489         int ret;
1490
1491         if (dev->dev_flags & DF_CONFIGURED) {
1492                 pr_err("se_dev->se_dev_ptr already set for storage"
1493                                 " object\n");
1494                 return -EEXIST;
1495         }
1496
1497         ret = dev->transport->configure_device(dev);
1498         if (ret)
1499                 goto out;
1500         dev->dev_flags |= DF_CONFIGURED;
1501
1502         /*
1503          * XXX: there is not much point to have two different values here..
1504          */
1505         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1506         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1507
1508         /*
1509          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1510          */
1511         dev->dev_attrib.hw_max_sectors =
1512                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1513                                          dev->dev_attrib.hw_block_size);
1514
1515         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1516         dev->creation_time = get_jiffies_64();
1517
1518         core_setup_reservations(dev);
1519
1520         ret = core_setup_alua(dev);
1521         if (ret)
1522                 goto out;
1523
1524         /*
1525          * Startup the struct se_device processing thread
1526          */
1527         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1528                                       dev->transport->name);
1529         if (!dev->tmr_wq) {
1530                 pr_err("Unable to create tmr workqueue for %s\n",
1531                         dev->transport->name);
1532                 ret = -ENOMEM;
1533                 goto out_free_alua;
1534         }
1535
1536         /*
1537          * Setup work_queue for QUEUE_FULL
1538          */
1539         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1540
1541         /*
1542          * Preload the initial INQUIRY const values if we are doing
1543          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1544          * passthrough because this is being provided by the backend LLD.
1545          */
1546         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1547                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1548                 strncpy(&dev->t10_wwn.model[0],
1549                         dev->transport->inquiry_prod, 16);
1550                 strncpy(&dev->t10_wwn.revision[0],
1551                         dev->transport->inquiry_rev, 4);
1552         }
1553
1554         scsi_dump_inquiry(dev);
1555
1556         spin_lock(&hba->device_lock);
1557         hba->dev_count++;
1558         spin_unlock(&hba->device_lock);
1559         return 0;
1560
1561 out_free_alua:
1562         core_alua_free_lu_gp_mem(dev);
1563 out:
1564         se_release_vpd_for_dev(dev);
1565         return ret;
1566 }
1567
1568 void target_free_device(struct se_device *dev)
1569 {
1570         struct se_hba *hba = dev->se_hba;
1571
1572         WARN_ON(!list_empty(&dev->dev_sep_list));
1573
1574         if (dev->dev_flags & DF_CONFIGURED) {
1575                 destroy_workqueue(dev->tmr_wq);
1576
1577                 spin_lock(&hba->device_lock);
1578                 hba->dev_count--;
1579                 spin_unlock(&hba->device_lock);
1580         }
1581
1582         core_alua_free_lu_gp_mem(dev);
1583         core_scsi3_free_all_registrations(dev);
1584         se_release_vpd_for_dev(dev);
1585
1586         dev->transport->free_device(dev);
1587 }
1588
1589 int core_dev_setup_virtual_lun0(void)
1590 {
1591         struct se_hba *hba;
1592         struct se_device *dev;
1593         char buf[16];
1594         int ret;
1595
1596         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1597         if (IS_ERR(hba))
1598                 return PTR_ERR(hba);
1599
1600         dev = target_alloc_device(hba, "virt_lun0");
1601         if (!dev) {
1602                 ret = -ENOMEM;
1603                 goto out_free_hba;
1604         }
1605
1606         memset(buf, 0, 16);
1607         sprintf(buf, "rd_pages=8");
1608         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1609
1610         ret = target_configure_device(dev);
1611         if (ret)
1612                 goto out_free_se_dev;
1613
1614         lun0_hba = hba;
1615         g_lun0_dev = dev;
1616         return 0;
1617
1618 out_free_se_dev:
1619         target_free_device(dev);
1620 out_free_hba:
1621         core_delete_hba(hba);
1622         return ret;
1623 }
1624
1625
1626 void core_dev_release_virtual_lun0(void)
1627 {
1628         struct se_hba *hba = lun0_hba;
1629
1630         if (!hba)
1631                 return;
1632
1633         if (g_lun0_dev)
1634                 target_free_device(g_lun0_dev);
1635         core_delete_hba(hba);
1636 }