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