linux/drivers/target/target_core_device.c
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   1/*******************************************************************************
   2 * Filename:  target_core_device.c (based on iscsi_target_device.c)
   3 *
   4 * This file contains the TCM Virtual Device and Disk Transport
   5 * agnostic related functions.
   6 *
   7 * (c) Copyright 2003-2012 RisingTide Systems LLC.
   8 *
   9 * Nicholas A. Bellinger <nab@kernel.org>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24 *
  25 ******************************************************************************/
  26
  27#include <linux/net.h>
  28#include <linux/string.h>
  29#include <linux/delay.h>
  30#include <linux/timer.h>
  31#include <linux/slab.h>
  32#include <linux/spinlock.h>
  33#include <linux/kthread.h>
  34#include <linux/in.h>
  35#include <linux/export.h>
  36#include <net/sock.h>
  37#include <net/tcp.h>
  38#include <scsi/scsi.h>
  39#include <scsi/scsi_device.h>
  40
  41#include <target/target_core_base.h>
  42#include <target/target_core_backend.h>
  43#include <target/target_core_fabric.h>
  44
  45#include "target_core_internal.h"
  46#include "target_core_alua.h"
  47#include "target_core_pr.h"
  48#include "target_core_ua.h"
  49
  50static struct se_hba *lun0_hba;
  51/* not static, needed by tpg.c */
  52struct se_device *g_lun0_dev;
  53
  54sense_reason_t
  55transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
  56{
  57        struct se_lun *se_lun = NULL;
  58        struct se_session *se_sess = se_cmd->se_sess;
  59        struct se_device *dev;
  60        unsigned long flags;
  61
  62        if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
  63                return TCM_NON_EXISTENT_LUN;
  64
  65        spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
  66        se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
  67        if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
  68                struct se_dev_entry *deve = se_cmd->se_deve;
  69
  70                deve->total_cmds++;
  71                deve->total_bytes += se_cmd->data_length;
  72
  73                if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
  74                    (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
  75                        pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
  76                                " Access for 0x%08x\n",
  77                                se_cmd->se_tfo->get_fabric_name(),
  78                                unpacked_lun);
  79                        spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  80                        return TCM_WRITE_PROTECTED;
  81                }
  82
  83                if (se_cmd->data_direction == DMA_TO_DEVICE)
  84                        deve->write_bytes += se_cmd->data_length;
  85                else if (se_cmd->data_direction == DMA_FROM_DEVICE)
  86                        deve->read_bytes += se_cmd->data_length;
  87
  88                deve->deve_cmds++;
  89
  90                se_lun = deve->se_lun;
  91                se_cmd->se_lun = deve->se_lun;
  92                se_cmd->pr_res_key = deve->pr_res_key;
  93                se_cmd->orig_fe_lun = unpacked_lun;
  94                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
  95        }
  96        spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
  97
  98        if (!se_lun) {
  99                /*
 100                 * Use the se_portal_group->tpg_virt_lun0 to allow for
 101                 * REPORT_LUNS, et al to be returned when no active
 102                 * MappedLUN=0 exists for this Initiator Port.
 103                 */
 104                if (unpacked_lun != 0) {
 105                        pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 106                                " Access for 0x%08x\n",
 107                                se_cmd->se_tfo->get_fabric_name(),
 108                                unpacked_lun);
 109                        return TCM_NON_EXISTENT_LUN;
 110                }
 111                /*
 112                 * Force WRITE PROTECT for virtual LUN 0
 113                 */
 114                if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
 115                    (se_cmd->data_direction != DMA_NONE))
 116                        return TCM_WRITE_PROTECTED;
 117
 118                se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 119                se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
 120                se_cmd->orig_fe_lun = 0;
 121                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 122        }
 123
 124        /* Directly associate cmd with se_dev */
 125        se_cmd->se_dev = se_lun->lun_se_dev;
 126
 127        /* TODO: get rid of this and use atomics for stats */
 128        dev = se_lun->lun_se_dev;
 129        spin_lock_irqsave(&dev->stats_lock, flags);
 130        dev->num_cmds++;
 131        if (se_cmd->data_direction == DMA_TO_DEVICE)
 132                dev->write_bytes += se_cmd->data_length;
 133        else if (se_cmd->data_direction == DMA_FROM_DEVICE)
 134                dev->read_bytes += se_cmd->data_length;
 135        spin_unlock_irqrestore(&dev->stats_lock, flags);
 136
 137        spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
 138        list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
 139        spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
 140
 141        return 0;
 142}
 143EXPORT_SYMBOL(transport_lookup_cmd_lun);
 144
 145int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
 146{
 147        struct se_dev_entry *deve;
 148        struct se_lun *se_lun = NULL;
 149        struct se_session *se_sess = se_cmd->se_sess;
 150        struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 151        unsigned long flags;
 152
 153        if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
 154                return -ENODEV;
 155
 156        spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
 157        se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
 158        deve = se_cmd->se_deve;
 159
 160        if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 161                se_tmr->tmr_lun = deve->se_lun;
 162                se_cmd->se_lun = deve->se_lun;
 163                se_lun = deve->se_lun;
 164                se_cmd->pr_res_key = deve->pr_res_key;
 165                se_cmd->orig_fe_lun = unpacked_lun;
 166        }
 167        spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
 168
 169        if (!se_lun) {
 170                pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
 171                        " Access for 0x%08x\n",
 172                        se_cmd->se_tfo->get_fabric_name(),
 173                        unpacked_lun);
 174                return -ENODEV;
 175        }
 176
 177        /* Directly associate cmd with se_dev */
 178        se_cmd->se_dev = se_lun->lun_se_dev;
 179        se_tmr->tmr_dev = se_lun->lun_se_dev;
 180
 181        spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
 182        list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
 183        spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
 184
 185        return 0;
 186}
 187EXPORT_SYMBOL(transport_lookup_tmr_lun);
 188
 189/*
 190 * This function is called from core_scsi3_emulate_pro_register_and_move()
 191 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
 192 * when a matching rtpi is found.
 193 */
 194struct se_dev_entry *core_get_se_deve_from_rtpi(
 195        struct se_node_acl *nacl,
 196        u16 rtpi)
 197{
 198        struct se_dev_entry *deve;
 199        struct se_lun *lun;
 200        struct se_port *port;
 201        struct se_portal_group *tpg = nacl->se_tpg;
 202        u32 i;
 203
 204        spin_lock_irq(&nacl->device_list_lock);
 205        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 206                deve = nacl->device_list[i];
 207
 208                if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 209                        continue;
 210
 211                lun = deve->se_lun;
 212                if (!lun) {
 213                        pr_err("%s device entries device pointer is"
 214                                " NULL, but Initiator has access.\n",
 215                                tpg->se_tpg_tfo->get_fabric_name());
 216                        continue;
 217                }
 218                port = lun->lun_sep;
 219                if (!port) {
 220                        pr_err("%s device entries device pointer is"
 221                                " NULL, but Initiator has access.\n",
 222                                tpg->se_tpg_tfo->get_fabric_name());
 223                        continue;
 224                }
 225                if (port->sep_rtpi != rtpi)
 226                        continue;
 227
 228                atomic_inc(&deve->pr_ref_count);
 229                smp_mb__after_atomic_inc();
 230                spin_unlock_irq(&nacl->device_list_lock);
 231
 232                return deve;
 233        }
 234        spin_unlock_irq(&nacl->device_list_lock);
 235
 236        return NULL;
 237}
 238
 239int core_free_device_list_for_node(
 240        struct se_node_acl *nacl,
 241        struct se_portal_group *tpg)
 242{
 243        struct se_dev_entry *deve;
 244        struct se_lun *lun;
 245        u32 i;
 246
 247        if (!nacl->device_list)
 248                return 0;
 249
 250        spin_lock_irq(&nacl->device_list_lock);
 251        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 252                deve = nacl->device_list[i];
 253
 254                if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
 255                        continue;
 256
 257                if (!deve->se_lun) {
 258                        pr_err("%s device entries device pointer is"
 259                                " NULL, but Initiator has access.\n",
 260                                tpg->se_tpg_tfo->get_fabric_name());
 261                        continue;
 262                }
 263                lun = deve->se_lun;
 264
 265                spin_unlock_irq(&nacl->device_list_lock);
 266                core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
 267                        TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
 268                spin_lock_irq(&nacl->device_list_lock);
 269        }
 270        spin_unlock_irq(&nacl->device_list_lock);
 271
 272        array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
 273        nacl->device_list = NULL;
 274
 275        return 0;
 276}
 277
 278void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
 279{
 280        struct se_dev_entry *deve;
 281        unsigned long flags;
 282
 283        spin_lock_irqsave(&se_nacl->device_list_lock, flags);
 284        deve = se_nacl->device_list[se_cmd->orig_fe_lun];
 285        deve->deve_cmds--;
 286        spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
 287}
 288
 289void core_update_device_list_access(
 290        u32 mapped_lun,
 291        u32 lun_access,
 292        struct se_node_acl *nacl)
 293{
 294        struct se_dev_entry *deve;
 295
 296        spin_lock_irq(&nacl->device_list_lock);
 297        deve = nacl->device_list[mapped_lun];
 298        if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 299                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 300                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 301        } else {
 302                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 303                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 304        }
 305        spin_unlock_irq(&nacl->device_list_lock);
 306}
 307
 308/*      core_enable_device_list_for_node():
 309 *
 310 *
 311 */
 312int core_enable_device_list_for_node(
 313        struct se_lun *lun,
 314        struct se_lun_acl *lun_acl,
 315        u32 mapped_lun,
 316        u32 lun_access,
 317        struct se_node_acl *nacl,
 318        struct se_portal_group *tpg)
 319{
 320        struct se_port *port = lun->lun_sep;
 321        struct se_dev_entry *deve;
 322
 323        spin_lock_irq(&nacl->device_list_lock);
 324
 325        deve = nacl->device_list[mapped_lun];
 326
 327        /*
 328         * Check if the call is handling demo mode -> explict LUN ACL
 329         * transition.  This transition must be for the same struct se_lun
 330         * + mapped_lun that was setup in demo mode..
 331         */
 332        if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
 333                if (deve->se_lun_acl != NULL) {
 334                        pr_err("struct se_dev_entry->se_lun_acl"
 335                               " already set for demo mode -> explict"
 336                               " LUN ACL transition\n");
 337                        spin_unlock_irq(&nacl->device_list_lock);
 338                        return -EINVAL;
 339                }
 340                if (deve->se_lun != lun) {
 341                        pr_err("struct se_dev_entry->se_lun does"
 342                               " match passed struct se_lun for demo mode"
 343                               " -> explict LUN ACL transition\n");
 344                        spin_unlock_irq(&nacl->device_list_lock);
 345                        return -EINVAL;
 346                }
 347                deve->se_lun_acl = lun_acl;
 348
 349                if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 350                        deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 351                        deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 352                } else {
 353                        deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 354                        deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 355                }
 356
 357                spin_unlock_irq(&nacl->device_list_lock);
 358                return 0;
 359        }
 360
 361        deve->se_lun = lun;
 362        deve->se_lun_acl = lun_acl;
 363        deve->mapped_lun = mapped_lun;
 364        deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
 365
 366        if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
 367                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
 368                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
 369        } else {
 370                deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
 371                deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
 372        }
 373
 374        deve->creation_time = get_jiffies_64();
 375        deve->attach_count++;
 376        spin_unlock_irq(&nacl->device_list_lock);
 377
 378        spin_lock_bh(&port->sep_alua_lock);
 379        list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
 380        spin_unlock_bh(&port->sep_alua_lock);
 381
 382        return 0;
 383}
 384
 385/*      core_disable_device_list_for_node():
 386 *
 387 *
 388 */
 389int core_disable_device_list_for_node(
 390        struct se_lun *lun,
 391        struct se_lun_acl *lun_acl,
 392        u32 mapped_lun,
 393        u32 lun_access,
 394        struct se_node_acl *nacl,
 395        struct se_portal_group *tpg)
 396{
 397        struct se_port *port = lun->lun_sep;
 398        struct se_dev_entry *deve = nacl->device_list[mapped_lun];
 399
 400        /*
 401         * If the MappedLUN entry is being disabled, the entry in
 402         * port->sep_alua_list must be removed now before clearing the
 403         * struct se_dev_entry pointers below as logic in
 404         * core_alua_do_transition_tg_pt() depends on these being present.
 405         *
 406         * deve->se_lun_acl will be NULL for demo-mode created LUNs
 407         * that have not been explicitly converted to MappedLUNs ->
 408         * struct se_lun_acl, but we remove deve->alua_port_list from
 409         * port->sep_alua_list. This also means that active UAs and
 410         * NodeACL context specific PR metadata for demo-mode
 411         * MappedLUN *deve will be released below..
 412         */
 413        spin_lock_bh(&port->sep_alua_lock);
 414        list_del(&deve->alua_port_list);
 415        spin_unlock_bh(&port->sep_alua_lock);
 416        /*
 417         * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
 418         * PR operation to complete.
 419         */
 420        while (atomic_read(&deve->pr_ref_count) != 0)
 421                cpu_relax();
 422
 423        spin_lock_irq(&nacl->device_list_lock);
 424        /*
 425         * Disable struct se_dev_entry LUN ACL mapping
 426         */
 427        core_scsi3_ua_release_all(deve);
 428        deve->se_lun = NULL;
 429        deve->se_lun_acl = NULL;
 430        deve->lun_flags = 0;
 431        deve->creation_time = 0;
 432        deve->attach_count--;
 433        spin_unlock_irq(&nacl->device_list_lock);
 434
 435        core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
 436        return 0;
 437}
 438
 439/*      core_clear_lun_from_tpg():
 440 *
 441 *
 442 */
 443void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
 444{
 445        struct se_node_acl *nacl;
 446        struct se_dev_entry *deve;
 447        u32 i;
 448
 449        spin_lock_irq(&tpg->acl_node_lock);
 450        list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
 451                spin_unlock_irq(&tpg->acl_node_lock);
 452
 453                spin_lock_irq(&nacl->device_list_lock);
 454                for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
 455                        deve = nacl->device_list[i];
 456                        if (lun != deve->se_lun)
 457                                continue;
 458                        spin_unlock_irq(&nacl->device_list_lock);
 459
 460                        core_disable_device_list_for_node(lun, NULL,
 461                                deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
 462                                nacl, tpg);
 463
 464                        spin_lock_irq(&nacl->device_list_lock);
 465                }
 466                spin_unlock_irq(&nacl->device_list_lock);
 467
 468                spin_lock_irq(&tpg->acl_node_lock);
 469        }
 470        spin_unlock_irq(&tpg->acl_node_lock);
 471}
 472
 473static struct se_port *core_alloc_port(struct se_device *dev)
 474{
 475        struct se_port *port, *port_tmp;
 476
 477        port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
 478        if (!port) {
 479                pr_err("Unable to allocate struct se_port\n");
 480                return ERR_PTR(-ENOMEM);
 481        }
 482        INIT_LIST_HEAD(&port->sep_alua_list);
 483        INIT_LIST_HEAD(&port->sep_list);
 484        atomic_set(&port->sep_tg_pt_secondary_offline, 0);
 485        spin_lock_init(&port->sep_alua_lock);
 486        mutex_init(&port->sep_tg_pt_md_mutex);
 487
 488        spin_lock(&dev->se_port_lock);
 489        if (dev->dev_port_count == 0x0000ffff) {
 490                pr_warn("Reached dev->dev_port_count =="
 491                                " 0x0000ffff\n");
 492                spin_unlock(&dev->se_port_lock);
 493                return ERR_PTR(-ENOSPC);
 494        }
 495again:
 496        /*
 497         * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
 498         * Here is the table from spc4r17 section 7.7.3.8.
 499         *
 500         *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
 501         *
 502         * Code      Description
 503         * 0h        Reserved
 504         * 1h        Relative port 1, historically known as port A
 505         * 2h        Relative port 2, historically known as port B
 506         * 3h to FFFFh    Relative port 3 through 65 535
 507         */
 508        port->sep_rtpi = dev->dev_rpti_counter++;
 509        if (!port->sep_rtpi)
 510                goto again;
 511
 512        list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
 513                /*
 514                 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
 515                 * for 16-bit wrap..
 516                 */
 517                if (port->sep_rtpi == port_tmp->sep_rtpi)
 518                        goto again;
 519        }
 520        spin_unlock(&dev->se_port_lock);
 521
 522        return port;
 523}
 524
 525static void core_export_port(
 526        struct se_device *dev,
 527        struct se_portal_group *tpg,
 528        struct se_port *port,
 529        struct se_lun *lun)
 530{
 531        struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
 532
 533        spin_lock(&dev->se_port_lock);
 534        spin_lock(&lun->lun_sep_lock);
 535        port->sep_tpg = tpg;
 536        port->sep_lun = lun;
 537        lun->lun_sep = port;
 538        spin_unlock(&lun->lun_sep_lock);
 539
 540        list_add_tail(&port->sep_list, &dev->dev_sep_list);
 541        spin_unlock(&dev->se_port_lock);
 542
 543        if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
 544            !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
 545                tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
 546                if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
 547                        pr_err("Unable to allocate t10_alua_tg_pt"
 548                                        "_gp_member_t\n");
 549                        return;
 550                }
 551                spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 552                __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
 553                        dev->t10_alua.default_tg_pt_gp);
 554                spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 555                pr_debug("%s/%s: Adding to default ALUA Target Port"
 556                        " Group: alua/default_tg_pt_gp\n",
 557                        dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
 558        }
 559
 560        dev->dev_port_count++;
 561        port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
 562}
 563
 564/*
 565 *      Called with struct se_device->se_port_lock spinlock held.
 566 */
 567static void core_release_port(struct se_device *dev, struct se_port *port)
 568        __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
 569{
 570        /*
 571         * Wait for any port reference for PR ALL_TG_PT=1 operation
 572         * to complete in __core_scsi3_alloc_registration()
 573         */
 574        spin_unlock(&dev->se_port_lock);
 575        if (atomic_read(&port->sep_tg_pt_ref_cnt))
 576                cpu_relax();
 577        spin_lock(&dev->se_port_lock);
 578
 579        core_alua_free_tg_pt_gp_mem(port);
 580
 581        list_del(&port->sep_list);
 582        dev->dev_port_count--;
 583        kfree(port);
 584}
 585
 586int core_dev_export(
 587        struct se_device *dev,
 588        struct se_portal_group *tpg,
 589        struct se_lun *lun)
 590{
 591        struct se_hba *hba = dev->se_hba;
 592        struct se_port *port;
 593
 594        port = core_alloc_port(dev);
 595        if (IS_ERR(port))
 596                return PTR_ERR(port);
 597
 598        lun->lun_se_dev = dev;
 599
 600        spin_lock(&hba->device_lock);
 601        dev->export_count++;
 602        spin_unlock(&hba->device_lock);
 603
 604        core_export_port(dev, tpg, port, lun);
 605        return 0;
 606}
 607
 608void core_dev_unexport(
 609        struct se_device *dev,
 610        struct se_portal_group *tpg,
 611        struct se_lun *lun)
 612{
 613        struct se_hba *hba = dev->se_hba;
 614        struct se_port *port = lun->lun_sep;
 615
 616        spin_lock(&lun->lun_sep_lock);
 617        if (lun->lun_se_dev == NULL) {
 618                spin_unlock(&lun->lun_sep_lock);
 619                return;
 620        }
 621        spin_unlock(&lun->lun_sep_lock);
 622
 623        spin_lock(&dev->se_port_lock);
 624        core_release_port(dev, port);
 625        spin_unlock(&dev->se_port_lock);
 626
 627        spin_lock(&hba->device_lock);
 628        dev->export_count--;
 629        spin_unlock(&hba->device_lock);
 630
 631        lun->lun_se_dev = NULL;
 632}
 633
 634static void se_release_vpd_for_dev(struct se_device *dev)
 635{
 636        struct t10_vpd *vpd, *vpd_tmp;
 637
 638        spin_lock(&dev->t10_wwn.t10_vpd_lock);
 639        list_for_each_entry_safe(vpd, vpd_tmp,
 640                        &dev->t10_wwn.t10_vpd_list, vpd_list) {
 641                list_del(&vpd->vpd_list);
 642                kfree(vpd);
 643        }
 644        spin_unlock(&dev->t10_wwn.t10_vpd_lock);
 645}
 646
 647static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
 648{
 649        u32 aligned_max_sectors;
 650        u32 alignment;
 651        /*
 652         * Limit max_sectors to a PAGE_SIZE aligned value for modern
 653         * transport_allocate_data_tasks() operation.
 654         */
 655        alignment = max(1ul, PAGE_SIZE / block_size);
 656        aligned_max_sectors = rounddown(max_sectors, alignment);
 657
 658        if (max_sectors != aligned_max_sectors)
 659                pr_info("Rounding down aligned max_sectors from %u to %u\n",
 660                        max_sectors, aligned_max_sectors);
 661
 662        return aligned_max_sectors;
 663}
 664
 665int se_dev_set_max_unmap_lba_count(
 666        struct se_device *dev,
 667        u32 max_unmap_lba_count)
 668{
 669        dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
 670        pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
 671                        dev, dev->dev_attrib.max_unmap_lba_count);
 672        return 0;
 673}
 674
 675int se_dev_set_max_unmap_block_desc_count(
 676        struct se_device *dev,
 677        u32 max_unmap_block_desc_count)
 678{
 679        dev->dev_attrib.max_unmap_block_desc_count =
 680                max_unmap_block_desc_count;
 681        pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
 682                        dev, dev->dev_attrib.max_unmap_block_desc_count);
 683        return 0;
 684}
 685
 686int se_dev_set_unmap_granularity(
 687        struct se_device *dev,
 688        u32 unmap_granularity)
 689{
 690        dev->dev_attrib.unmap_granularity = unmap_granularity;
 691        pr_debug("dev[%p]: Set unmap_granularity: %u\n",
 692                        dev, dev->dev_attrib.unmap_granularity);
 693        return 0;
 694}
 695
 696int se_dev_set_unmap_granularity_alignment(
 697        struct se_device *dev,
 698        u32 unmap_granularity_alignment)
 699{
 700        dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
 701        pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
 702                        dev, dev->dev_attrib.unmap_granularity_alignment);
 703        return 0;
 704}
 705
 706int se_dev_set_max_write_same_len(
 707        struct se_device *dev,
 708        u32 max_write_same_len)
 709{
 710        dev->dev_attrib.max_write_same_len = max_write_same_len;
 711        pr_debug("dev[%p]: Set max_write_same_len: %u\n",
 712                        dev, dev->dev_attrib.max_write_same_len);
 713        return 0;
 714}
 715
 716static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 717{
 718        const char *configname;
 719
 720        configname = config_item_name(&dev->dev_group.cg_item);
 721        if (strlen(configname) >= 16) {
 722                pr_warn("dev[%p]: Backstore name '%s' is too long for "
 723                        "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
 724                        configname);
 725        }
 726        snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
 727}
 728
 729int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
 730{
 731        if (dev->export_count) {
 732                pr_err("dev[%p]: Unable to change model alias"
 733                        " while export_count is %d\n",
 734                        dev, dev->export_count);
 735                        return -EINVAL;
 736        }
 737
 738        if (flag != 0 && flag != 1) {
 739                pr_err("Illegal value %d\n", flag);
 740                return -EINVAL;
 741        }
 742
 743        if (flag) {
 744                dev_set_t10_wwn_model_alias(dev);
 745        } else {
 746                strncpy(&dev->t10_wwn.model[0],
 747                        dev->transport->inquiry_prod, 16);
 748        }
 749        dev->dev_attrib.emulate_model_alias = flag;
 750
 751        return 0;
 752}
 753
 754int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 755{
 756        if (flag != 0 && flag != 1) {
 757                pr_err("Illegal value %d\n", flag);
 758                return -EINVAL;
 759        }
 760
 761        if (flag) {
 762                pr_err("dpo_emulated not supported\n");
 763                return -EINVAL;
 764        }
 765
 766        return 0;
 767}
 768
 769int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
 770{
 771        if (flag != 0 && flag != 1) {
 772                pr_err("Illegal value %d\n", flag);
 773                return -EINVAL;
 774        }
 775
 776        if (flag &&
 777            dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 778                pr_err("emulate_fua_write not supported for pSCSI\n");
 779                return -EINVAL;
 780        }
 781        dev->dev_attrib.emulate_fua_write = flag;
 782        pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
 783                        dev, dev->dev_attrib.emulate_fua_write);
 784        return 0;
 785}
 786
 787int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
 788{
 789        if (flag != 0 && flag != 1) {
 790                pr_err("Illegal value %d\n", flag);
 791                return -EINVAL;
 792        }
 793
 794        if (flag) {
 795                pr_err("ua read emulated not supported\n");
 796                return -EINVAL;
 797        }
 798
 799        return 0;
 800}
 801
 802int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
 803{
 804        if (flag != 0 && flag != 1) {
 805                pr_err("Illegal value %d\n", flag);
 806                return -EINVAL;
 807        }
 808        if (flag &&
 809            dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 810                pr_err("emulate_write_cache not supported for pSCSI\n");
 811                return -EINVAL;
 812        }
 813        if (dev->transport->get_write_cache) {
 814                pr_warn("emulate_write_cache cannot be changed when underlying"
 815                        " HW reports WriteCacheEnabled, ignoring request\n");
 816                return 0;
 817        }
 818
 819        dev->dev_attrib.emulate_write_cache = flag;
 820        pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
 821                        dev, dev->dev_attrib.emulate_write_cache);
 822        return 0;
 823}
 824
 825int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
 826{
 827        if ((flag != 0) && (flag != 1) && (flag != 2)) {
 828                pr_err("Illegal value %d\n", flag);
 829                return -EINVAL;
 830        }
 831
 832        if (dev->export_count) {
 833                pr_err("dev[%p]: Unable to change SE Device"
 834                        " UA_INTRLCK_CTRL while export_count is %d\n",
 835                        dev, dev->export_count);
 836                return -EINVAL;
 837        }
 838        dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
 839        pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
 840                dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
 841
 842        return 0;
 843}
 844
 845int se_dev_set_emulate_tas(struct se_device *dev, int flag)
 846{
 847        if ((flag != 0) && (flag != 1)) {
 848                pr_err("Illegal value %d\n", flag);
 849                return -EINVAL;
 850        }
 851
 852        if (dev->export_count) {
 853                pr_err("dev[%p]: Unable to change SE Device TAS while"
 854                        " export_count is %d\n",
 855                        dev, dev->export_count);
 856                return -EINVAL;
 857        }
 858        dev->dev_attrib.emulate_tas = flag;
 859        pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
 860                dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
 861
 862        return 0;
 863}
 864
 865int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
 866{
 867        if ((flag != 0) && (flag != 1)) {
 868                pr_err("Illegal value %d\n", flag);
 869                return -EINVAL;
 870        }
 871        /*
 872         * We expect this value to be non-zero when generic Block Layer
 873         * Discard supported is detected iblock_create_virtdevice().
 874         */
 875        if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 876                pr_err("Generic Block Discard not supported\n");
 877                return -ENOSYS;
 878        }
 879
 880        dev->dev_attrib.emulate_tpu = flag;
 881        pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
 882                                dev, flag);
 883        return 0;
 884}
 885
 886int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
 887{
 888        if ((flag != 0) && (flag != 1)) {
 889                pr_err("Illegal value %d\n", flag);
 890                return -EINVAL;
 891        }
 892        /*
 893         * We expect this value to be non-zero when generic Block Layer
 894         * Discard supported is detected iblock_create_virtdevice().
 895         */
 896        if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
 897                pr_err("Generic Block Discard not supported\n");
 898                return -ENOSYS;
 899        }
 900
 901        dev->dev_attrib.emulate_tpws = flag;
 902        pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
 903                                dev, flag);
 904        return 0;
 905}
 906
 907int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
 908{
 909        if ((flag != 0) && (flag != 1)) {
 910                pr_err("Illegal value %d\n", flag);
 911                return -EINVAL;
 912        }
 913        dev->dev_attrib.enforce_pr_isids = flag;
 914        pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
 915                (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
 916        return 0;
 917}
 918
 919int se_dev_set_is_nonrot(struct se_device *dev, int flag)
 920{
 921        if ((flag != 0) && (flag != 1)) {
 922                printk(KERN_ERR "Illegal value %d\n", flag);
 923                return -EINVAL;
 924        }
 925        dev->dev_attrib.is_nonrot = flag;
 926        pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
 927               dev, flag);
 928        return 0;
 929}
 930
 931int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
 932{
 933        if (flag != 0) {
 934                printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
 935                        " reordering not implemented\n", dev);
 936                return -ENOSYS;
 937        }
 938        dev->dev_attrib.emulate_rest_reord = flag;
 939        pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
 940        return 0;
 941}
 942
 943/*
 944 * Note, this can only be called on unexported SE Device Object.
 945 */
 946int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
 947{
 948        if (dev->export_count) {
 949                pr_err("dev[%p]: Unable to change SE Device TCQ while"
 950                        " export_count is %d\n",
 951                        dev, dev->export_count);
 952                return -EINVAL;
 953        }
 954        if (!queue_depth) {
 955                pr_err("dev[%p]: Illegal ZERO value for queue"
 956                        "_depth\n", dev);
 957                return -EINVAL;
 958        }
 959
 960        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 961                if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 962                        pr_err("dev[%p]: Passed queue_depth: %u"
 963                                " exceeds TCM/SE_Device TCQ: %u\n",
 964                                dev, queue_depth,
 965                                dev->dev_attrib.hw_queue_depth);
 966                        return -EINVAL;
 967                }
 968        } else {
 969                if (queue_depth > dev->dev_attrib.queue_depth) {
 970                        if (queue_depth > dev->dev_attrib.hw_queue_depth) {
 971                                pr_err("dev[%p]: Passed queue_depth:"
 972                                        " %u exceeds TCM/SE_Device MAX"
 973                                        " TCQ: %u\n", dev, queue_depth,
 974                                        dev->dev_attrib.hw_queue_depth);
 975                                return -EINVAL;
 976                        }
 977                }
 978        }
 979
 980        dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
 981        pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
 982                        dev, queue_depth);
 983        return 0;
 984}
 985
 986int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
 987{
 988        int block_size = dev->dev_attrib.block_size;
 989
 990        if (dev->export_count) {
 991                pr_err("dev[%p]: Unable to change SE Device"
 992                        " fabric_max_sectors while export_count is %d\n",
 993                        dev, dev->export_count);
 994                return -EINVAL;
 995        }
 996        if (!fabric_max_sectors) {
 997                pr_err("dev[%p]: Illegal ZERO value for"
 998                        " fabric_max_sectors\n", dev);
 999                return -EINVAL;
1000        }
1001        if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1002                pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1003                        " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1004                                DA_STATUS_MAX_SECTORS_MIN);
1005                return -EINVAL;
1006        }
1007        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1008                if (fabric_max_sectors > dev->dev_attrib.hw_max_sectors) {
1009                        pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1010                                " greater than TCM/SE_Device max_sectors:"
1011                                " %u\n", dev, fabric_max_sectors,
1012                                dev->dev_attrib.hw_max_sectors);
1013                         return -EINVAL;
1014                }
1015        } else {
1016                if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1017                        pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1018                                " greater than DA_STATUS_MAX_SECTORS_MAX:"
1019                                " %u\n", dev, fabric_max_sectors,
1020                                DA_STATUS_MAX_SECTORS_MAX);
1021                        return -EINVAL;
1022                }
1023        }
1024        /*
1025         * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1026         */
1027        if (!block_size) {
1028                block_size = 512;
1029                pr_warn("Defaulting to 512 for zero block_size\n");
1030        }
1031        fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1032                                                      block_size);
1033
1034        dev->dev_attrib.fabric_max_sectors = fabric_max_sectors;
1035        pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1036                        dev, fabric_max_sectors);
1037        return 0;
1038}
1039
1040int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1041{
1042        if (dev->export_count) {
1043                pr_err("dev[%p]: Unable to change SE Device"
1044                        " optimal_sectors while export_count is %d\n",
1045                        dev, dev->export_count);
1046                return -EINVAL;
1047        }
1048        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1049                pr_err("dev[%p]: Passed optimal_sectors cannot be"
1050                                " changed for TCM/pSCSI\n", dev);
1051                return -EINVAL;
1052        }
1053        if (optimal_sectors > dev->dev_attrib.fabric_max_sectors) {
1054                pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1055                        " greater than fabric_max_sectors: %u\n", dev,
1056                        optimal_sectors, dev->dev_attrib.fabric_max_sectors);
1057                return -EINVAL;
1058        }
1059
1060        dev->dev_attrib.optimal_sectors = optimal_sectors;
1061        pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1062                        dev, optimal_sectors);
1063        return 0;
1064}
1065
1066int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1067{
1068        if (dev->export_count) {
1069                pr_err("dev[%p]: Unable to change SE Device block_size"
1070                        " while export_count is %d\n",
1071                        dev, dev->export_count);
1072                return -EINVAL;
1073        }
1074
1075        if ((block_size != 512) &&
1076            (block_size != 1024) &&
1077            (block_size != 2048) &&
1078            (block_size != 4096)) {
1079                pr_err("dev[%p]: Illegal value for block_device: %u"
1080                        " for SE device, must be 512, 1024, 2048 or 4096\n",
1081                        dev, block_size);
1082                return -EINVAL;
1083        }
1084
1085        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1086                pr_err("dev[%p]: Not allowed to change block_size for"
1087                        " Physical Device, use for Linux/SCSI to change"
1088                        " block_size for underlying hardware\n", dev);
1089                return -EINVAL;
1090        }
1091
1092        dev->dev_attrib.block_size = block_size;
1093        pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1094                        dev, block_size);
1095        return 0;
1096}
1097
1098struct se_lun *core_dev_add_lun(
1099        struct se_portal_group *tpg,
1100        struct se_device *dev,
1101        u32 lun)
1102{
1103        struct se_lun *lun_p;
1104        int rc;
1105
1106        lun_p = core_tpg_pre_addlun(tpg, lun);
1107        if (IS_ERR(lun_p))
1108                return lun_p;
1109
1110        rc = core_tpg_post_addlun(tpg, lun_p,
1111                                TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1112        if (rc < 0)
1113                return ERR_PTR(rc);
1114
1115        pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1116                " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1117                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1118                tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1119        /*
1120         * Update LUN maps for dynamically added initiators when
1121         * generate_node_acl is enabled.
1122         */
1123        if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1124                struct se_node_acl *acl;
1125                spin_lock_irq(&tpg->acl_node_lock);
1126                list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1127                        if (acl->dynamic_node_acl &&
1128                            (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1129                             !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1130                                spin_unlock_irq(&tpg->acl_node_lock);
1131                                core_tpg_add_node_to_devs(acl, tpg);
1132                                spin_lock_irq(&tpg->acl_node_lock);
1133                        }
1134                }
1135                spin_unlock_irq(&tpg->acl_node_lock);
1136        }
1137
1138        return lun_p;
1139}
1140
1141/*      core_dev_del_lun():
1142 *
1143 *
1144 */
1145int core_dev_del_lun(
1146        struct se_portal_group *tpg,
1147        u32 unpacked_lun)
1148{
1149        struct se_lun *lun;
1150
1151        lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1152        if (IS_ERR(lun))
1153                return PTR_ERR(lun);
1154
1155        core_tpg_post_dellun(tpg, lun);
1156
1157        pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1158                " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1159                tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1160                tpg->se_tpg_tfo->get_fabric_name());
1161
1162        return 0;
1163}
1164
1165struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1166{
1167        struct se_lun *lun;
1168
1169        spin_lock(&tpg->tpg_lun_lock);
1170        if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1171                pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1172                        "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1173                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1174                        TRANSPORT_MAX_LUNS_PER_TPG-1,
1175                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1176                spin_unlock(&tpg->tpg_lun_lock);
1177                return NULL;
1178        }
1179        lun = tpg->tpg_lun_list[unpacked_lun];
1180
1181        if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1182                pr_err("%s Logical Unit Number: %u is not free on"
1183                        " Target Portal Group: %hu, ignoring request.\n",
1184                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1185                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1186                spin_unlock(&tpg->tpg_lun_lock);
1187                return NULL;
1188        }
1189        spin_unlock(&tpg->tpg_lun_lock);
1190
1191        return lun;
1192}
1193
1194/*      core_dev_get_lun():
1195 *
1196 *
1197 */
1198static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1199{
1200        struct se_lun *lun;
1201
1202        spin_lock(&tpg->tpg_lun_lock);
1203        if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1204                pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1205                        "_TPG-1: %u for Target Portal Group: %hu\n",
1206                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1207                        TRANSPORT_MAX_LUNS_PER_TPG-1,
1208                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1209                spin_unlock(&tpg->tpg_lun_lock);
1210                return NULL;
1211        }
1212        lun = tpg->tpg_lun_list[unpacked_lun];
1213
1214        if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1215                pr_err("%s Logical Unit Number: %u is not active on"
1216                        " Target Portal Group: %hu, ignoring request.\n",
1217                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1218                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1219                spin_unlock(&tpg->tpg_lun_lock);
1220                return NULL;
1221        }
1222        spin_unlock(&tpg->tpg_lun_lock);
1223
1224        return lun;
1225}
1226
1227struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1228        struct se_portal_group *tpg,
1229        struct se_node_acl *nacl,
1230        u32 mapped_lun,
1231        int *ret)
1232{
1233        struct se_lun_acl *lacl;
1234
1235        if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1236                pr_err("%s InitiatorName exceeds maximum size.\n",
1237                        tpg->se_tpg_tfo->get_fabric_name());
1238                *ret = -EOVERFLOW;
1239                return NULL;
1240        }
1241        lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1242        if (!lacl) {
1243                pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1244                *ret = -ENOMEM;
1245                return NULL;
1246        }
1247
1248        INIT_LIST_HEAD(&lacl->lacl_list);
1249        lacl->mapped_lun = mapped_lun;
1250        lacl->se_lun_nacl = nacl;
1251        snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1252                 nacl->initiatorname);
1253
1254        return lacl;
1255}
1256
1257int core_dev_add_initiator_node_lun_acl(
1258        struct se_portal_group *tpg,
1259        struct se_lun_acl *lacl,
1260        u32 unpacked_lun,
1261        u32 lun_access)
1262{
1263        struct se_lun *lun;
1264        struct se_node_acl *nacl;
1265
1266        lun = core_dev_get_lun(tpg, unpacked_lun);
1267        if (!lun) {
1268                pr_err("%s Logical Unit Number: %u is not active on"
1269                        " Target Portal Group: %hu, ignoring request.\n",
1270                        tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1271                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
1272                return -EINVAL;
1273        }
1274
1275        nacl = lacl->se_lun_nacl;
1276        if (!nacl)
1277                return -EINVAL;
1278
1279        if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1280            (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1281                lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1282
1283        lacl->se_lun = lun;
1284
1285        if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1286                        lun_access, nacl, tpg) < 0)
1287                return -EINVAL;
1288
1289        spin_lock(&lun->lun_acl_lock);
1290        list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1291        atomic_inc(&lun->lun_acl_count);
1292        smp_mb__after_atomic_inc();
1293        spin_unlock(&lun->lun_acl_lock);
1294
1295        pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1296                " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1297                tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1298                (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1299                lacl->initiatorname);
1300        /*
1301         * Check to see if there are any existing persistent reservation APTPL
1302         * pre-registrations that need to be enabled for this LUN ACL..
1303         */
1304        core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1305        return 0;
1306}
1307
1308/*      core_dev_del_initiator_node_lun_acl():
1309 *
1310 *
1311 */
1312int core_dev_del_initiator_node_lun_acl(
1313        struct se_portal_group *tpg,
1314        struct se_lun *lun,
1315        struct se_lun_acl *lacl)
1316{
1317        struct se_node_acl *nacl;
1318
1319        nacl = lacl->se_lun_nacl;
1320        if (!nacl)
1321                return -EINVAL;
1322
1323        spin_lock(&lun->lun_acl_lock);
1324        list_del(&lacl->lacl_list);
1325        atomic_dec(&lun->lun_acl_count);
1326        smp_mb__after_atomic_dec();
1327        spin_unlock(&lun->lun_acl_lock);
1328
1329        core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1330                TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1331
1332        lacl->se_lun = NULL;
1333
1334        pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1335                " InitiatorNode: %s Mapped LUN: %u\n",
1336                tpg->se_tpg_tfo->get_fabric_name(),
1337                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1338                lacl->initiatorname, lacl->mapped_lun);
1339
1340        return 0;
1341}
1342
1343void core_dev_free_initiator_node_lun_acl(
1344        struct se_portal_group *tpg,
1345        struct se_lun_acl *lacl)
1346{
1347        pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1348                " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1349                tpg->se_tpg_tfo->tpg_get_tag(tpg),
1350                tpg->se_tpg_tfo->get_fabric_name(),
1351                lacl->initiatorname, lacl->mapped_lun);
1352
1353        kfree(lacl);
1354}
1355
1356static void scsi_dump_inquiry(struct se_device *dev)
1357{
1358        struct t10_wwn *wwn = &dev->t10_wwn;
1359        char buf[17];
1360        int i, device_type;
1361        /*
1362         * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1363         */
1364        for (i = 0; i < 8; i++)
1365                if (wwn->vendor[i] >= 0x20)
1366                        buf[i] = wwn->vendor[i];
1367                else
1368                        buf[i] = ' ';
1369        buf[i] = '\0';
1370        pr_debug("  Vendor: %s\n", buf);
1371
1372        for (i = 0; i < 16; i++)
1373                if (wwn->model[i] >= 0x20)
1374                        buf[i] = wwn->model[i];
1375                else
1376                        buf[i] = ' ';
1377        buf[i] = '\0';
1378        pr_debug("  Model: %s\n", buf);
1379
1380        for (i = 0; i < 4; i++)
1381                if (wwn->revision[i] >= 0x20)
1382                        buf[i] = wwn->revision[i];
1383                else
1384                        buf[i] = ' ';
1385        buf[i] = '\0';
1386        pr_debug("  Revision: %s\n", buf);
1387
1388        device_type = dev->transport->get_device_type(dev);
1389        pr_debug("  Type:   %s ", scsi_device_type(device_type));
1390}
1391
1392struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1393{
1394        struct se_device *dev;
1395
1396        dev = hba->transport->alloc_device(hba, name);
1397        if (!dev)
1398                return NULL;
1399
1400        dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1401        dev->se_hba = hba;
1402        dev->transport = hba->transport;
1403
1404        INIT_LIST_HEAD(&dev->dev_list);
1405        INIT_LIST_HEAD(&dev->dev_sep_list);
1406        INIT_LIST_HEAD(&dev->dev_tmr_list);
1407        INIT_LIST_HEAD(&dev->delayed_cmd_list);
1408        INIT_LIST_HEAD(&dev->state_list);
1409        INIT_LIST_HEAD(&dev->qf_cmd_list);
1410        spin_lock_init(&dev->stats_lock);
1411        spin_lock_init(&dev->execute_task_lock);
1412        spin_lock_init(&dev->delayed_cmd_lock);
1413        spin_lock_init(&dev->dev_reservation_lock);
1414        spin_lock_init(&dev->se_port_lock);
1415        spin_lock_init(&dev->se_tmr_lock);
1416        spin_lock_init(&dev->qf_cmd_lock);
1417        atomic_set(&dev->dev_ordered_id, 0);
1418        INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1419        spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1420        INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1421        INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1422        spin_lock_init(&dev->t10_pr.registration_lock);
1423        spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1424        INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1425        spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1426
1427        dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1428        dev->t10_wwn.t10_dev = dev;
1429        dev->t10_alua.t10_dev = dev;
1430
1431        dev->dev_attrib.da_dev = dev;
1432        dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1433        dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1434        dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1435        dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1436        dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1437        dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1438        dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1439        dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1440        dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1441        dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1442        dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1443        dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1444        dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1445        dev->dev_attrib.max_unmap_block_desc_count =
1446                DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1447        dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1448        dev->dev_attrib.unmap_granularity_alignment =
1449                                DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1450        dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1451        dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
1452        dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
1453
1454        return dev;
1455}
1456
1457int target_configure_device(struct se_device *dev)
1458{
1459        struct se_hba *hba = dev->se_hba;
1460        int ret;
1461
1462        if (dev->dev_flags & DF_CONFIGURED) {
1463                pr_err("se_dev->se_dev_ptr already set for storage"
1464                                " object\n");
1465                return -EEXIST;
1466        }
1467
1468        ret = dev->transport->configure_device(dev);
1469        if (ret)
1470                goto out;
1471        dev->dev_flags |= DF_CONFIGURED;
1472
1473        /*
1474         * XXX: there is not much point to have two different values here..
1475         */
1476        dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1477        dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1478
1479        /*
1480         * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1481         */
1482        dev->dev_attrib.hw_max_sectors =
1483                se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1484                                         dev->dev_attrib.hw_block_size);
1485
1486        dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1487        dev->creation_time = get_jiffies_64();
1488
1489        ret = core_setup_alua(dev);
1490        if (ret)
1491                goto out;
1492
1493        /*
1494         * Startup the struct se_device processing thread
1495         */
1496        dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1497                                      dev->transport->name);
1498        if (!dev->tmr_wq) {
1499                pr_err("Unable to create tmr workqueue for %s\n",
1500                        dev->transport->name);
1501                ret = -ENOMEM;
1502                goto out_free_alua;
1503        }
1504
1505        /*
1506         * Setup work_queue for QUEUE_FULL
1507         */
1508        INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1509
1510        /*
1511         * Preload the initial INQUIRY const values if we are doing
1512         * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1513         * passthrough because this is being provided by the backend LLD.
1514         */
1515        if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1516                strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1517                strncpy(&dev->t10_wwn.model[0],
1518                        dev->transport->inquiry_prod, 16);
1519                strncpy(&dev->t10_wwn.revision[0],
1520                        dev->transport->inquiry_rev, 4);
1521        }
1522
1523        scsi_dump_inquiry(dev);
1524
1525        spin_lock(&hba->device_lock);
1526        hba->dev_count++;
1527        spin_unlock(&hba->device_lock);
1528        return 0;
1529
1530out_free_alua:
1531        core_alua_free_lu_gp_mem(dev);
1532out:
1533        se_release_vpd_for_dev(dev);
1534        return ret;
1535}
1536
1537void target_free_device(struct se_device *dev)
1538{
1539        struct se_hba *hba = dev->se_hba;
1540
1541        WARN_ON(!list_empty(&dev->dev_sep_list));
1542
1543        if (dev->dev_flags & DF_CONFIGURED) {
1544                destroy_workqueue(dev->tmr_wq);
1545
1546                spin_lock(&hba->device_lock);
1547                hba->dev_count--;
1548                spin_unlock(&hba->device_lock);
1549        }
1550
1551        core_alua_free_lu_gp_mem(dev);
1552        core_scsi3_free_all_registrations(dev);
1553        se_release_vpd_for_dev(dev);
1554
1555        dev->transport->free_device(dev);
1556}
1557
1558int core_dev_setup_virtual_lun0(void)
1559{
1560        struct se_hba *hba;
1561        struct se_device *dev;
1562        char buf[16];
1563        int ret;
1564
1565        hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1566        if (IS_ERR(hba))
1567                return PTR_ERR(hba);
1568
1569        dev = target_alloc_device(hba, "virt_lun0");
1570        if (!dev) {
1571                ret = -ENOMEM;
1572                goto out_free_hba;
1573        }
1574
1575        memset(buf, 0, 16);
1576        sprintf(buf, "rd_pages=8");
1577        hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1578
1579        ret = target_configure_device(dev);
1580        if (ret)
1581                goto out_free_se_dev;
1582
1583        lun0_hba = hba;
1584        g_lun0_dev = dev;
1585        return 0;
1586
1587out_free_se_dev:
1588        target_free_device(dev);
1589out_free_hba:
1590        core_delete_hba(hba);
1591        return ret;
1592}
1593
1594
1595void core_dev_release_virtual_lun0(void)
1596{
1597        struct se_hba *hba = lun0_hba;
1598
1599        if (!hba)
1600                return;
1601
1602        if (g_lun0_dev)
1603                target_free_device(g_lun0_dev);
1604        core_delete_hba(hba);
1605}
1606
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