drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * (c) Copyright 2002-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/net.h>
  27 #include <linux/delay.h>
  28 #include <linux/string.h>
  29 #include <linux/timer.h>
  30 #include <linux/slab.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/kthread.h>
  33 #include <linux/in.h>
  34 #include <linux/cdrom.h>
  35 #include <linux/module.h>
  36 #include <linux/ratelimit.h>
  37 #include <asm/unaligned.h>
  38 #include <net/sock.h>
  39 #include <net/tcp.h>
  40 #include <scsi/scsi.h>
  41 #include <scsi/scsi_cmnd.h>
  42 #include <scsi/scsi_tcq.h>
  43
  44 #include <target/target_core_base.h>
  45 #include <target/target_core_backend.h>
  46 #include <target/target_core_fabric.h>
  47 #include <target/target_core_configfs.h>
  48
  49 #include "target_core_internal.h"
  50 #include "target_core_alua.h"
  51 #include "target_core_pr.h"
  52 #include "target_core_ua.h"
  53
  54 #define CREATE_TRACE_POINTS
  55 #include <trace/events/target.h>
  56
  57 static struct workqueue_struct *target_completion_wq;
  58 static struct kmem_cache *se_sess_cache;
  59 struct kmem_cache *se_ua_cache;
  60 struct kmem_cache *t10_pr_reg_cache;
  61 struct kmem_cache *t10_alua_lu_gp_cache;
  62 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  63 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  64 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  65 struct kmem_cache *t10_alua_lba_map_cache;
  66 struct kmem_cache *t10_alua_lba_map_mem_cache;
  67
  68 static void transport_complete_task_attr(struct se_cmd *cmd);
  69 static void transport_handle_queue_full(struct se_cmd *cmd,
  70                 struct se_device *dev);
  71 static int transport_put_cmd(struct se_cmd *cmd);
  72 static void target_complete_ok_work(struct work_struct *work);
  73
  74 int init_se_kmem_caches(void)
  75 {
  76         se_sess_cache = kmem_cache_create("se_sess_cache",
  77                         sizeof(struct se_session), __alignof__(struct se_session),
  78                         0, NULL);
  79         if (!se_sess_cache) {
  80                 pr_err("kmem_cache_create() for struct se_session"
  81                                 " failed\n");
  82                 goto out;
  83         }
  84         se_ua_cache = kmem_cache_create("se_ua_cache",
  85                         sizeof(struct se_ua), __alignof__(struct se_ua),
  86                         0, NULL);
  87         if (!se_ua_cache) {
  88                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  89                 goto out_free_sess_cache;
  90         }
  91         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  92                         sizeof(struct t10_pr_registration),
  93                         __alignof__(struct t10_pr_registration), 0, NULL);
  94         if (!t10_pr_reg_cache) {
  95                 pr_err("kmem_cache_create() for struct t10_pr_registration"
  96                                 " failed\n");
  97                 goto out_free_ua_cache;
  98         }
  99         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 100                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 101                         0, NULL);
 102         if (!t10_alua_lu_gp_cache) {
 103                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 104                                 " failed\n");
 105                 goto out_free_pr_reg_cache;
 106         }
 107         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 108                         sizeof(struct t10_alua_lu_gp_member),
 109                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 110         if (!t10_alua_lu_gp_mem_cache) {
 111                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 112                                 "cache failed\n");
 113                 goto out_free_lu_gp_cache;
 114         }
 115         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 116                         sizeof(struct t10_alua_tg_pt_gp),
 117                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 118         if (!t10_alua_tg_pt_gp_cache) {
 119                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 120                                 "cache failed\n");
 121                 goto out_free_lu_gp_mem_cache;
 122         }
 123         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 124                         "t10_alua_tg_pt_gp_mem_cache",
 125                         sizeof(struct t10_alua_tg_pt_gp_member),
 126                         __alignof__(struct t10_alua_tg_pt_gp_member),
 127                         0, NULL);
 128         if (!t10_alua_tg_pt_gp_mem_cache) {
 129                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 130                                 "mem_t failed\n");
 131                 goto out_free_tg_pt_gp_cache;
 132         }
 133         t10_alua_lba_map_cache = kmem_cache_create(
 134                         "t10_alua_lba_map_cache",
 135                         sizeof(struct t10_alua_lba_map),
 136                         __alignof__(struct t10_alua_lba_map), 0, NULL);
 137         if (!t10_alua_lba_map_cache) {
 138                 pr_err("kmem_cache_create() for t10_alua_lba_map_"
 139                                 "cache failed\n");
 140                 goto out_free_tg_pt_gp_mem_cache;
 141         }
 142         t10_alua_lba_map_mem_cache = kmem_cache_create(
 143                         "t10_alua_lba_map_mem_cache",
 144                         sizeof(struct t10_alua_lba_map_member),
 145                         __alignof__(struct t10_alua_lba_map_member), 0, NULL);
 146         if (!t10_alua_lba_map_mem_cache) {
 147                 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
 148                                 "cache failed\n");
 149                 goto out_free_lba_map_cache;
 150         }
 151
 152         target_completion_wq = alloc_workqueue("target_completion",
 153                                                WQ_MEM_RECLAIM, 0);
 154         if (!target_completion_wq)
 155                 goto out_free_lba_map_mem_cache;
 156
 157         return 0;
 158
 159 out_free_lba_map_mem_cache:
 160         kmem_cache_destroy(t10_alua_lba_map_mem_cache);
 161 out_free_lba_map_cache:
 162         kmem_cache_destroy(t10_alua_lba_map_cache);
 163 out_free_tg_pt_gp_mem_cache:
 164         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 165 out_free_tg_pt_gp_cache:
 166         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 167 out_free_lu_gp_mem_cache:
 168         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 169 out_free_lu_gp_cache:
 170         kmem_cache_destroy(t10_alua_lu_gp_cache);
 171 out_free_pr_reg_cache:
 172         kmem_cache_destroy(t10_pr_reg_cache);
 173 out_free_ua_cache:
 174         kmem_cache_destroy(se_ua_cache);
 175 out_free_sess_cache:
 176         kmem_cache_destroy(se_sess_cache);
 177 out:
 178         return -ENOMEM;
 179 }
 180
 181 void release_se_kmem_caches(void)
 182 {
 183         destroy_workqueue(target_completion_wq);
 184         kmem_cache_destroy(se_sess_cache);
 185         kmem_cache_destroy(se_ua_cache);
 186         kmem_cache_destroy(t10_pr_reg_cache);
 187         kmem_cache_destroy(t10_alua_lu_gp_cache);
 188         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 189         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 190         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 191         kmem_cache_destroy(t10_alua_lba_map_cache);
 192         kmem_cache_destroy(t10_alua_lba_map_mem_cache);
 193 }
 194
 195 /* This code ensures unique mib indexes are handed out. */
 196 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 197 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 198
 199 /*
 200  * Allocate a new row index for the entry type specified
 201  */
 202 u32 scsi_get_new_index(scsi_index_t type)
 203 {
 204         u32 new_index;
 205
 206         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 207
 208         spin_lock(&scsi_mib_index_lock);
 209         new_index = ++scsi_mib_index[type];
 210         spin_unlock(&scsi_mib_index_lock);
 211
 212         return new_index;
 213 }
 214
 215 void transport_subsystem_check_init(void)
 216 {
 217         int ret;
 218         static int sub_api_initialized;
 219
 220         if (sub_api_initialized)
 221                 return;
 222
 223         ret = request_module("target_core_iblock");
 224         if (ret != 0)
 225                 pr_err("Unable to load target_core_iblock\n");
 226
 227         ret = request_module("target_core_file");
 228         if (ret != 0)
 229                 pr_err("Unable to load target_core_file\n");
 230
 231         ret = request_module("target_core_pscsi");
 232         if (ret != 0)
 233                 pr_err("Unable to load target_core_pscsi\n");
 234
 235         sub_api_initialized = 1;
 236 }
 237
 238 struct se_session *transport_init_session(void)
 239 {
 240         struct se_session *se_sess;
 241
 242         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 243         if (!se_sess) {
 244                 pr_err("Unable to allocate struct se_session from"
 245                                 " se_sess_cache\n");
 246                 return ERR_PTR(-ENOMEM);
 247         }
 248         INIT_LIST_HEAD(&se_sess->sess_list);
 249         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 250         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 251         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 252         spin_lock_init(&se_sess->sess_cmd_lock);
 253         kref_init(&se_sess->sess_kref);
 254
 255         return se_sess;
 256 }
 257 EXPORT_SYMBOL(transport_init_session);
 258
 259 int transport_alloc_session_tags(struct se_session *se_sess,
 260                                  unsigned int tag_num, unsigned int tag_size)
 261 {
 262         int rc;
 263
 264         se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
 265                                         GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
 266         if (!se_sess->sess_cmd_map) {
 267                 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
 268                 if (!se_sess->sess_cmd_map) {
 269                         pr_err("Unable to allocate se_sess->sess_cmd_map\n");
 270                         return -ENOMEM;
 271                 }
 272         }
 273
 274         rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
 275         if (rc < 0) {
 276                 pr_err("Unable to init se_sess->sess_tag_pool,"
 277                         " tag_num: %u\n", tag_num);
 278                 if (is_vmalloc_addr(se_sess->sess_cmd_map))
 279                         vfree(se_sess->sess_cmd_map);
 280                 else
 281                         kfree(se_sess->sess_cmd_map);
 282                 se_sess->sess_cmd_map = NULL;
 283                 return -ENOMEM;
 284         }
 285
 286         return 0;
 287 }
 288 EXPORT_SYMBOL(transport_alloc_session_tags);
 289
 290 struct se_session *transport_init_session_tags(unsigned int tag_num,
 291                                                unsigned int tag_size)
 292 {
 293         struct se_session *se_sess;
 294         int rc;
 295
 296         se_sess = transport_init_session();
 297         if (IS_ERR(se_sess))
 298                 return se_sess;
 299
 300         rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
 301         if (rc < 0) {
 302                 transport_free_session(se_sess);
 303                 return ERR_PTR(-ENOMEM);
 304         }
 305
 306         return se_sess;
 307 }
 308 EXPORT_SYMBOL(transport_init_session_tags);
 309
 310 /*
 311  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 312  */
 313 void __transport_register_session(
 314         struct se_portal_group *se_tpg,
 315         struct se_node_acl *se_nacl,
 316         struct se_session *se_sess,
 317         void *fabric_sess_ptr)
 318 {
 319         unsigned char buf[PR_REG_ISID_LEN];
 320
 321         se_sess->se_tpg = se_tpg;
 322         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 323         /*
 324          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 325          *
 326          * Only set for struct se_session's that will actually be moving I/O.
 327          * eg: *NOT* discovery sessions.
 328          */
 329         if (se_nacl) {
 330                 /*
 331                  * If the fabric module supports an ISID based TransportID,
 332                  * save this value in binary from the fabric I_T Nexus now.
 333                  */
 334                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 335                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 336                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 337                                         &buf[0], PR_REG_ISID_LEN);
 338                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 339                 }
 340                 kref_get(&se_nacl->acl_kref);
 341
 342                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 343                 /*
 344                  * The se_nacl->nacl_sess pointer will be set to the
 345                  * last active I_T Nexus for each struct se_node_acl.
 346                  */
 347                 se_nacl->nacl_sess = se_sess;
 348
 349                 list_add_tail(&se_sess->sess_acl_list,
 350                               &se_nacl->acl_sess_list);
 351                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 352         }
 353         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 354
 355         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 356                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 357 }
 358 EXPORT_SYMBOL(__transport_register_session);
 359
 360 void transport_register_session(
 361         struct se_portal_group *se_tpg,
 362         struct se_node_acl *se_nacl,
 363         struct se_session *se_sess,
 364         void *fabric_sess_ptr)
 365 {
 366         unsigned long flags;
 367
 368         spin_lock_irqsave(&se_tpg->session_lock, flags);
 369         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 370         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 371 }
 372 EXPORT_SYMBOL(transport_register_session);
 373
 374 static void target_release_session(struct kref *kref)
 375 {
 376         struct se_session *se_sess = container_of(kref,
 377                         struct se_session, sess_kref);
 378         struct se_portal_group *se_tpg = se_sess->se_tpg;
 379
 380         se_tpg->se_tpg_tfo->close_session(se_sess);
 381 }
 382
 383 void target_get_session(struct se_session *se_sess)
 384 {
 385         kref_get(&se_sess->sess_kref);
 386 }
 387 EXPORT_SYMBOL(target_get_session);
 388
 389 void target_put_session(struct se_session *se_sess)
 390 {
 391         struct se_portal_group *tpg = se_sess->se_tpg;
 392
 393         if (tpg->se_tpg_tfo->put_session != NULL) {
 394                 tpg->se_tpg_tfo->put_session(se_sess);
 395                 return;
 396         }
 397         kref_put(&se_sess->sess_kref, target_release_session);
 398 }
 399 EXPORT_SYMBOL(target_put_session);
 400
 401 static void target_complete_nacl(struct kref *kref)
 402 {
 403         struct se_node_acl *nacl = container_of(kref,
 404                                 struct se_node_acl, acl_kref);
 405
 406         complete(&nacl->acl_free_comp);
 407 }
 408
 409 void target_put_nacl(struct se_node_acl *nacl)
 410 {
 411         kref_put(&nacl->acl_kref, target_complete_nacl);
 412 }
 413
 414 void transport_deregister_session_configfs(struct se_session *se_sess)
 415 {
 416         struct se_node_acl *se_nacl;
 417         unsigned long flags;
 418         /*
 419          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 420          */
 421         se_nacl = se_sess->se_node_acl;
 422         if (se_nacl) {
 423                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 424                 if (se_nacl->acl_stop == 0)
 425                         list_del(&se_sess->sess_acl_list);
 426                 /*
 427                  * If the session list is empty, then clear the pointer.
 428                  * Otherwise, set the struct se_session pointer from the tail
 429                  * element of the per struct se_node_acl active session list.
 430                  */
 431                 if (list_empty(&se_nacl->acl_sess_list))
 432                         se_nacl->nacl_sess = NULL;
 433                 else {
 434                         se_nacl->nacl_sess = container_of(
 435                                         se_nacl->acl_sess_list.prev,
 436                                         struct se_session, sess_acl_list);
 437                 }
 438                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 439         }
 440 }
 441 EXPORT_SYMBOL(transport_deregister_session_configfs);
 442
 443 void transport_free_session(struct se_session *se_sess)
 444 {
 445         if (se_sess->sess_cmd_map) {
 446                 percpu_ida_destroy(&se_sess->sess_tag_pool);
 447                 if (is_vmalloc_addr(se_sess->sess_cmd_map))
 448                         vfree(se_sess->sess_cmd_map);
 449                 else
 450                         kfree(se_sess->sess_cmd_map);
 451         }
 452         kmem_cache_free(se_sess_cache, se_sess);
 453 }
 454 EXPORT_SYMBOL(transport_free_session);
 455
 456 void transport_deregister_session(struct se_session *se_sess)
 457 {
 458         struct se_portal_group *se_tpg = se_sess->se_tpg;
 459         struct target_core_fabric_ops *se_tfo;
 460         struct se_node_acl *se_nacl;
 461         unsigned long flags;
 462         bool comp_nacl = true;
 463
 464         if (!se_tpg) {
 465                 transport_free_session(se_sess);
 466                 return;
 467         }
 468         se_tfo = se_tpg->se_tpg_tfo;
 469
 470         spin_lock_irqsave(&se_tpg->session_lock, flags);
 471         list_del(&se_sess->sess_list);
 472         se_sess->se_tpg = NULL;
 473         se_sess->fabric_sess_ptr = NULL;
 474         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 475
 476         /*
 477          * Determine if we need to do extra work for this initiator node's
 478          * struct se_node_acl if it had been previously dynamically generated.
 479          */
 480         se_nacl = se_sess->se_node_acl;
 481
 482         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 483         if (se_nacl && se_nacl->dynamic_node_acl) {
 484                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 485                         list_del(&se_nacl->acl_list);
 486                         se_tpg->num_node_acls--;
 487                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 488                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 489                         core_free_device_list_for_node(se_nacl, se_tpg);
 490                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 491
 492                         comp_nacl = false;
 493                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 494                 }
 495         }
 496         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 497
 498         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 499                 se_tpg->se_tpg_tfo->get_fabric_name());
 500         /*
 501          * If last kref is dropping now for an explicit NodeACL, awake sleeping
 502          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 503          * removal context.
 504          */
 505         if (se_nacl && comp_nacl == true)
 506                 target_put_nacl(se_nacl);
 507
 508         transport_free_session(se_sess);
 509 }
 510 EXPORT_SYMBOL(transport_deregister_session);
 511
 512 /*
 513  * Called with cmd->t_state_lock held.
 514  */
 515 static void target_remove_from_state_list(struct se_cmd *cmd)
 516 {
 517         struct se_device *dev = cmd->se_dev;
 518         unsigned long flags;
 519
 520         if (!dev)
 521                 return;
 522
 523         if (cmd->transport_state & CMD_T_BUSY)
 524                 return;
 525
 526         spin_lock_irqsave(&dev->execute_task_lock, flags);
 527         if (cmd->state_active) {
 528                 list_del(&cmd->state_list);
 529                 cmd->state_active = false;
 530         }
 531         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 532 }
 533
 534 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
 535                                     bool write_pending)
 536 {
 537         unsigned long flags;
 538
 539         spin_lock_irqsave(&cmd->t_state_lock, flags);
 540         if (write_pending)
 541                 cmd->t_state = TRANSPORT_WRITE_PENDING;
 542
 543         if (remove_from_lists) {
 544                 target_remove_from_state_list(cmd);
 545
 546                 /*
 547                  * Clear struct se_cmd->se_lun before the handoff to FE.
 548                  */
 549                 cmd->se_lun = NULL;
 550         }
 551
 552         /*
 553          * Determine if frontend context caller is requesting the stopping of
 554          * this command for frontend exceptions.
 555          */
 556         if (cmd->transport_state & CMD_T_STOP) {
 557                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 558                         __func__, __LINE__,
 559                         cmd->se_tfo->get_task_tag(cmd));
 560
 561                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 562
 563                 complete_all(&cmd->t_transport_stop_comp);
 564                 return 1;
 565         }
 566
 567         cmd->transport_state &= ~CMD_T_ACTIVE;
 568         if (remove_from_lists) {
 569                 /*
 570                  * Some fabric modules like tcm_loop can release
 571                  * their internally allocated I/O reference now and
 572                  * struct se_cmd now.
 573                  *
 574                  * Fabric modules are expected to return '1' here if the
 575                  * se_cmd being passed is released at this point,
 576                  * or zero if not being released.
 577                  */
 578                 if (cmd->se_tfo->check_stop_free != NULL) {
 579                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 580                         return cmd->se_tfo->check_stop_free(cmd);
 581                 }
 582         }
 583
 584         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 585         return 0;
 586 }
 587
 588 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 589 {
 590         return transport_cmd_check_stop(cmd, true, false);
 591 }
 592
 593 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 594 {
 595         struct se_lun *lun = cmd->se_lun;
 596
 597         if (!lun)
 598                 return;
 599
 600         if (cmpxchg(&cmd->lun_ref_active, true, false))
 601                 percpu_ref_put(&lun->lun_ref);
 602 }
 603
 604 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 605 {
 606         if (transport_cmd_check_stop_to_fabric(cmd))
 607                 return;
 608         if (remove)
 609                 transport_put_cmd(cmd);
 610 }
 611
 612 static void target_complete_failure_work(struct work_struct *work)
 613 {
 614         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 615
 616         transport_generic_request_failure(cmd,
 617                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
 618 }
 619
 620 /*
 621  * Used when asking transport to copy Sense Data from the underlying
 622  * Linux/SCSI struct scsi_cmnd
 623  */
 624 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
 625 {
 626         struct se_device *dev = cmd->se_dev;
 627
 628         WARN_ON(!cmd->se_lun);
 629
 630         if (!dev)
 631                 return NULL;
 632
 633         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
 634                 return NULL;
 635
 636         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
 637
 638         pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
 639                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
 640         return cmd->sense_buffer;
 641 }
 642
 643 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 644 {
 645         struct se_device *dev = cmd->se_dev;
 646         int success = scsi_status == GOOD;
 647         unsigned long flags;
 648
 649         cmd->scsi_status = scsi_status;
 650
 651
 652         spin_lock_irqsave(&cmd->t_state_lock, flags);
 653         cmd->transport_state &= ~CMD_T_BUSY;
 654
 655         if (dev && dev->transport->transport_complete) {
 656                 dev->transport->transport_complete(cmd,
 657                                 cmd->t_data_sg,
 658                                 transport_get_sense_buffer(cmd));
 659                 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
 660                         success = 1;
 661         }
 662
 663         /*
 664          * See if we are waiting to complete for an exception condition.
 665          */
 666         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 667                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 668                 complete(&cmd->task_stop_comp);
 669                 return;
 670         }
 671
 672         /*
 673          * Check for case where an explicit ABORT_TASK has been received
 674          * and transport_wait_for_tasks() will be waiting for completion..
 675          */
 676         if (cmd->transport_state & CMD_T_ABORTED &&
 677             cmd->transport_state & CMD_T_STOP) {
 678                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 679                 complete_all(&cmd->t_transport_stop_comp);
 680                 return;
 681         } else if (!success) {
 682                 INIT_WORK(&cmd->work, target_complete_failure_work);
 683         } else {
 684                 INIT_WORK(&cmd->work, target_complete_ok_work);
 685         }
 686
 687         cmd->t_state = TRANSPORT_COMPLETE;
 688         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 689         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 690
 691         queue_work(target_completion_wq, &cmd->work);
 692 }
 693 EXPORT_SYMBOL(target_complete_cmd);
 694
 695 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
 696 {
 697         if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
 698                 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
 699                         cmd->residual_count += cmd->data_length - length;
 700                 } else {
 701                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
 702                         cmd->residual_count = cmd->data_length - length;
 703                 }
 704
 705                 cmd->data_length = length;
 706         }
 707
 708         target_complete_cmd(cmd, scsi_status);
 709 }
 710 EXPORT_SYMBOL(target_complete_cmd_with_length);
 711
 712 static void target_add_to_state_list(struct se_cmd *cmd)
 713 {
 714         struct se_device *dev = cmd->se_dev;
 715         unsigned long flags;
 716
 717         spin_lock_irqsave(&dev->execute_task_lock, flags);
 718         if (!cmd->state_active) {
 719                 list_add_tail(&cmd->state_list, &dev->state_list);
 720                 cmd->state_active = true;
 721         }
 722         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 723 }
 724
 725 /*
 726  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 727  */
 728 static void transport_write_pending_qf(struct se_cmd *cmd);
 729 static void transport_complete_qf(struct se_cmd *cmd);
 730
 731 void target_qf_do_work(struct work_struct *work)
 732 {
 733         struct se_device *dev = container_of(work, struct se_device,
 734                                         qf_work_queue);
 735         LIST_HEAD(qf_cmd_list);
 736         struct se_cmd *cmd, *cmd_tmp;
 737
 738         spin_lock_irq(&dev->qf_cmd_lock);
 739         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 740         spin_unlock_irq(&dev->qf_cmd_lock);
 741
 742         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 743                 list_del(&cmd->se_qf_node);
 744                 atomic_dec(&dev->dev_qf_count);
 745                 smp_mb__after_atomic_dec();
 746
 747                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 748                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 749                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 750                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 751                         : "UNKNOWN");
 752
 753                 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 754                         transport_write_pending_qf(cmd);
 755                 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 756                         transport_complete_qf(cmd);
 757         }
 758 }
 759
 760 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 761 {
 762         switch (cmd->data_direction) {
 763         case DMA_NONE:
 764                 return "NONE";
 765         case DMA_FROM_DEVICE:
 766                 return "READ";
 767         case DMA_TO_DEVICE:
 768                 return "WRITE";
 769         case DMA_BIDIRECTIONAL:
 770                 return "BIDI";
 771         default:
 772                 break;
 773         }
 774
 775         return "UNKNOWN";
 776 }
 777
 778 void transport_dump_dev_state(
 779         struct se_device *dev,
 780         char *b,
 781         int *bl)
 782 {
 783         *bl += sprintf(b + *bl, "Status: ");
 784         if (dev->export_count)
 785                 *bl += sprintf(b + *bl, "ACTIVATED");
 786         else
 787                 *bl += sprintf(b + *bl, "DEACTIVATED");
 788
 789         *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 790         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 791                 dev->dev_attrib.block_size,
 792                 dev->dev_attrib.hw_max_sectors);
 793         *bl += sprintf(b + *bl, "        ");
 794 }
 795
 796 void transport_dump_vpd_proto_id(
 797         struct t10_vpd *vpd,
 798         unsigned char *p_buf,
 799         int p_buf_len)
 800 {
 801         unsigned char buf[VPD_TMP_BUF_SIZE];
 802         int len;
 803
 804         memset(buf, 0, VPD_TMP_BUF_SIZE);
 805         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 806
 807         switch (vpd->protocol_identifier) {
 808         case 0x00:
 809                 sprintf(buf+len, "Fibre Channel\n");
 810                 break;
 811         case 0x10:
 812                 sprintf(buf+len, "Parallel SCSI\n");
 813                 break;
 814         case 0x20:
 815                 sprintf(buf+len, "SSA\n");
 816                 break;
 817         case 0x30:
 818                 sprintf(buf+len, "IEEE 1394\n");
 819                 break;
 820         case 0x40:
 821                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 822                                 " Protocol\n");
 823                 break;
 824         case 0x50:
 825                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 826                 break;
 827         case 0x60:
 828                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 829                 break;
 830         case 0x70:
 831                 sprintf(buf+len, "Automation/Drive Interface Transport"
 832                                 " Protocol\n");
 833                 break;
 834         case 0x80:
 835                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 836                 break;
 837         default:
 838                 sprintf(buf+len, "Unknown 0x%02x\n",
 839                                 vpd->protocol_identifier);
 840                 break;
 841         }
 842
 843         if (p_buf)
 844                 strncpy(p_buf, buf, p_buf_len);
 845         else
 846                 pr_debug("%s", buf);
 847 }
 848
 849 void
 850 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 851 {
 852         /*
 853          * Check if the Protocol Identifier Valid (PIV) bit is set..
 854          *
 855          * from spc3r23.pdf section 7.5.1
 856          */
 857          if (page_83[1] & 0x80) {
 858                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 859                 vpd->protocol_identifier_set = 1;
 860                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 861         }
 862 }
 863 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 864
 865 int transport_dump_vpd_assoc(
 866         struct t10_vpd *vpd,
 867         unsigned char *p_buf,
 868         int p_buf_len)
 869 {
 870         unsigned char buf[VPD_TMP_BUF_SIZE];
 871         int ret = 0;
 872         int len;
 873
 874         memset(buf, 0, VPD_TMP_BUF_SIZE);
 875         len = sprintf(buf, "T10 VPD Identifier Association: ");
 876
 877         switch (vpd->association) {
 878         case 0x00:
 879                 sprintf(buf+len, "addressed logical unit\n");
 880                 break;
 881         case 0x10:
 882                 sprintf(buf+len, "target port\n");
 883                 break;
 884         case 0x20:
 885                 sprintf(buf+len, "SCSI target device\n");
 886                 break;
 887         default:
 888                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 889                 ret = -EINVAL;
 890                 break;
 891         }
 892
 893         if (p_buf)
 894                 strncpy(p_buf, buf, p_buf_len);
 895         else
 896                 pr_debug("%s", buf);
 897
 898         return ret;
 899 }
 900
 901 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 902 {
 903         /*
 904          * The VPD identification association..
 905          *
 906          * from spc3r23.pdf Section 7.6.3.1 Table 297
 907          */
 908         vpd->association = (page_83[1] & 0x30);
 909         return transport_dump_vpd_assoc(vpd, NULL, 0);
 910 }
 911 EXPORT_SYMBOL(transport_set_vpd_assoc);
 912
 913 int transport_dump_vpd_ident_type(
 914         struct t10_vpd *vpd,
 915         unsigned char *p_buf,
 916         int p_buf_len)
 917 {
 918         unsigned char buf[VPD_TMP_BUF_SIZE];
 919         int ret = 0;
 920         int len;
 921
 922         memset(buf, 0, VPD_TMP_BUF_SIZE);
 923         len = sprintf(buf, "T10 VPD Identifier Type: ");
 924
 925         switch (vpd->device_identifier_type) {
 926         case 0x00:
 927                 sprintf(buf+len, "Vendor specific\n");
 928                 break;
 929         case 0x01:
 930                 sprintf(buf+len, "T10 Vendor ID based\n");
 931                 break;
 932         case 0x02:
 933                 sprintf(buf+len, "EUI-64 based\n");
 934                 break;
 935         case 0x03:
 936                 sprintf(buf+len, "NAA\n");
 937                 break;
 938         case 0x04:
 939                 sprintf(buf+len, "Relative target port identifier\n");
 940                 break;
 941         case 0x08:
 942                 sprintf(buf+len, "SCSI name string\n");
 943                 break;
 944         default:
 945                 sprintf(buf+len, "Unsupported: 0x%02x\n",
 946                                 vpd->device_identifier_type);
 947                 ret = -EINVAL;
 948                 break;
 949         }
 950
 951         if (p_buf) {
 952                 if (p_buf_len < strlen(buf)+1)
 953                         return -EINVAL;
 954                 strncpy(p_buf, buf, p_buf_len);
 955         } else {
 956                 pr_debug("%s", buf);
 957         }
 958
 959         return ret;
 960 }
 961
 962 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 963 {
 964         /*
 965          * The VPD identifier type..
 966          *
 967          * from spc3r23.pdf Section 7.6.3.1 Table 298
 968          */
 969         vpd->device_identifier_type = (page_83[1] & 0x0f);
 970         return transport_dump_vpd_ident_type(vpd, NULL, 0);
 971 }
 972 EXPORT_SYMBOL(transport_set_vpd_ident_type);
 973
 974 int transport_dump_vpd_ident(
 975         struct t10_vpd *vpd,
 976         unsigned char *p_buf,
 977         int p_buf_len)
 978 {
 979         unsigned char buf[VPD_TMP_BUF_SIZE];
 980         int ret = 0;
 981
 982         memset(buf, 0, VPD_TMP_BUF_SIZE);
 983
 984         switch (vpd->device_identifier_code_set) {
 985         case 0x01: /* Binary */
 986                 snprintf(buf, sizeof(buf),
 987                         "T10 VPD Binary Device Identifier: %s\n",
 988                         &vpd->device_identifier[0]);
 989                 break;
 990         case 0x02: /* ASCII */
 991                 snprintf(buf, sizeof(buf),
 992                         "T10 VPD ASCII Device Identifier: %s\n",
 993                         &vpd->device_identifier[0]);
 994                 break;
 995         case 0x03: /* UTF-8 */
 996                 snprintf(buf, sizeof(buf),
 997                         "T10 VPD UTF-8 Device Identifier: %s\n",
 998                         &vpd->device_identifier[0]);
 999                 break;
1000         default:
1001                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1002                         " 0x%02x", vpd->device_identifier_code_set);
1003                 ret = -EINVAL;
1004                 break;
1005         }
1006
1007         if (p_buf)
1008                 strncpy(p_buf, buf, p_buf_len);
1009         else
1010                 pr_debug("%s", buf);
1011
1012         return ret;
1013 }
1014
1015 int
1016 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1017 {
1018         static const char hex_str[] = "0123456789abcdef";
1019         int j = 0, i = 4; /* offset to start of the identifier */
1020
1021         /*
1022          * The VPD Code Set (encoding)
1023          *
1024          * from spc3r23.pdf Section 7.6.3.1 Table 296
1025          */
1026         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1027         switch (vpd->device_identifier_code_set) {
1028         case 0x01: /* Binary */
1029                 vpd->device_identifier[j++] =
1030                                 hex_str[vpd->device_identifier_type];
1031                 while (i < (4 + page_83[3])) {
1032                         vpd->device_identifier[j++] =
1033                                 hex_str[(page_83[i] & 0xf0) >> 4];
1034                         vpd->device_identifier[j++] =
1035                                 hex_str[page_83[i] & 0x0f];
1036                         i++;
1037                 }
1038                 break;
1039         case 0x02: /* ASCII */
1040         case 0x03: /* UTF-8 */
1041                 while (i < (4 + page_83[3]))
1042                         vpd->device_identifier[j++] = page_83[i++];
1043                 break;
1044         default:
1045                 break;
1046         }
1047
1048         return transport_dump_vpd_ident(vpd, NULL, 0);
1049 }
1050 EXPORT_SYMBOL(transport_set_vpd_ident);
1051
1052 sense_reason_t
1053 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1054 {
1055         struct se_device *dev = cmd->se_dev;
1056
1057         if (cmd->unknown_data_length) {
1058                 cmd->data_length = size;
1059         } else if (size != cmd->data_length) {
1060                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1061                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1062                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1063                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1064
1065                 if (cmd->data_direction == DMA_TO_DEVICE) {
1066                         pr_err("Rejecting underflow/overflow"
1067                                         " WRITE data\n");
1068                         return TCM_INVALID_CDB_FIELD;
1069                 }
1070                 /*
1071                  * Reject READ_* or WRITE_* with overflow/underflow for
1072                  * type SCF_SCSI_DATA_CDB.
1073                  */
1074                 if (dev->dev_attrib.block_size != 512)  {
1075                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1076                                 " CDB on non 512-byte sector setup subsystem"
1077                                 " plugin: %s\n", dev->transport->name);
1078                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1079                         return TCM_INVALID_CDB_FIELD;
1080                 }
1081                 /*
1082                  * For the overflow case keep the existing fabric provided
1083                  * ->data_length.  Otherwise for the underflow case, reset
1084                  * ->data_length to the smaller SCSI expected data transfer
1085                  * length.
1086                  */
1087                 if (size > cmd->data_length) {
1088                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1089                         cmd->residual_count = (size - cmd->data_length);
1090                 } else {
1091                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1092                         cmd->residual_count = (cmd->data_length - size);
1093                         cmd->data_length = size;
1094                 }
1095         }
1096
1097         return 0;
1098
1099 }
1100
1101 /*
1102  * Used by fabric modules containing a local struct se_cmd within their
1103  * fabric dependent per I/O descriptor.
1104  */
1105 void transport_init_se_cmd(
1106         struct se_cmd *cmd,
1107         struct target_core_fabric_ops *tfo,
1108         struct se_session *se_sess,
1109         u32 data_length,
1110         int data_direction,
1111         int task_attr,
1112         unsigned char *sense_buffer)
1113 {
1114         INIT_LIST_HEAD(&cmd->se_delayed_node);
1115         INIT_LIST_HEAD(&cmd->se_qf_node);
1116         INIT_LIST_HEAD(&cmd->se_cmd_list);
1117         INIT_LIST_HEAD(&cmd->state_list);
1118         init_completion(&cmd->t_transport_stop_comp);
1119         init_completion(&cmd->cmd_wait_comp);
1120         init_completion(&cmd->task_stop_comp);
1121         spin_lock_init(&cmd->t_state_lock);
1122         kref_init(&cmd->cmd_kref);
1123         cmd->transport_state = CMD_T_DEV_ACTIVE;
1124
1125         cmd->se_tfo = tfo;
1126         cmd->se_sess = se_sess;
1127         cmd->data_length = data_length;
1128         cmd->data_direction = data_direction;
1129         cmd->sam_task_attr = task_attr;
1130         cmd->sense_buffer = sense_buffer;
1131
1132         cmd->state_active = false;
1133 }
1134 EXPORT_SYMBOL(transport_init_se_cmd);
1135
1136 static sense_reason_t
1137 transport_check_alloc_task_attr(struct se_cmd *cmd)
1138 {
1139         struct se_device *dev = cmd->se_dev;
1140
1141         /*
1142          * Check if SAM Task Attribute emulation is enabled for this
1143          * struct se_device storage object
1144          */
1145         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1146                 return 0;
1147
1148         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1149                 pr_debug("SAM Task Attribute ACA"
1150                         " emulation is not supported\n");
1151                 return TCM_INVALID_CDB_FIELD;
1152         }
1153         /*
1154          * Used to determine when ORDERED commands should go from
1155          * Dormant to Active status.
1156          */
1157         cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1158         smp_mb__after_atomic_inc();
1159         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1160                         cmd->se_ordered_id, cmd->sam_task_attr,
1161                         dev->transport->name);
1162         return 0;
1163 }
1164
1165 sense_reason_t
1166 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1167 {
1168         struct se_device *dev = cmd->se_dev;
1169         sense_reason_t ret;
1170
1171         /*
1172          * Ensure that the received CDB is less than the max (252 + 8) bytes
1173          * for VARIABLE_LENGTH_CMD
1174          */
1175         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1176                 pr_err("Received SCSI CDB with command_size: %d that"
1177                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1178                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1179                 return TCM_INVALID_CDB_FIELD;
1180         }
1181         /*
1182          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1183          * allocate the additional extended CDB buffer now..  Otherwise
1184          * setup the pointer from __t_task_cdb to t_task_cdb.
1185          */
1186         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1187                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1188                                                 GFP_KERNEL);
1189                 if (!cmd->t_task_cdb) {
1190                         pr_err("Unable to allocate cmd->t_task_cdb"
1191                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1192                                 scsi_command_size(cdb),
1193                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1194                         return TCM_OUT_OF_RESOURCES;
1195                 }
1196         } else
1197                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1198         /*
1199          * Copy the original CDB into cmd->
1200          */
1201         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1202
1203         trace_target_sequencer_start(cmd);
1204
1205         /*
1206          * Check for an existing UNIT ATTENTION condition
1207          */
1208         ret = target_scsi3_ua_check(cmd);
1209         if (ret)
1210                 return ret;
1211
1212         ret = target_alua_state_check(cmd);
1213         if (ret)
1214                 return ret;
1215
1216         ret = target_check_reservation(cmd);
1217         if (ret) {
1218                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1219                 return ret;
1220         }
1221
1222         ret = dev->transport->parse_cdb(cmd);
1223         if (ret)
1224                 return ret;
1225
1226         ret = transport_check_alloc_task_attr(cmd);
1227         if (ret)
1228                 return ret;
1229
1230         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1231
1232         spin_lock(&cmd->se_lun->lun_sep_lock);
1233         if (cmd->se_lun->lun_sep)
1234                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1235         spin_unlock(&cmd->se_lun->lun_sep_lock);
1236         return 0;
1237 }
1238 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1239
1240 /*
1241  * Used by fabric module frontends to queue tasks directly.
1242  * Many only be used from process context only
1243  */
1244 int transport_handle_cdb_direct(
1245         struct se_cmd *cmd)
1246 {
1247         sense_reason_t ret;
1248
1249         if (!cmd->se_lun) {
1250                 dump_stack();
1251                 pr_err("cmd->se_lun is NULL\n");
1252                 return -EINVAL;
1253         }
1254         if (in_interrupt()) {
1255                 dump_stack();
1256                 pr_err("transport_generic_handle_cdb cannot be called"
1257                                 " from interrupt context\n");
1258                 return -EINVAL;
1259         }
1260         /*
1261          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1262          * outstanding descriptors are handled correctly during shutdown via
1263          * transport_wait_for_tasks()
1264          *
1265          * Also, we don't take cmd->t_state_lock here as we only expect
1266          * this to be called for initial descriptor submission.
1267          */
1268         cmd->t_state = TRANSPORT_NEW_CMD;
1269         cmd->transport_state |= CMD_T_ACTIVE;
1270
1271         /*
1272          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1273          * so follow TRANSPORT_NEW_CMD processing thread context usage
1274          * and call transport_generic_request_failure() if necessary..
1275          */
1276         ret = transport_generic_new_cmd(cmd);
1277         if (ret)
1278                 transport_generic_request_failure(cmd, ret);
1279         return 0;
1280 }
1281 EXPORT_SYMBOL(transport_handle_cdb_direct);
1282
1283 sense_reason_t
1284 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1285                 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1286 {
1287         if (!sgl || !sgl_count)
1288                 return 0;
1289
1290         /*
1291          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1292          * scatterlists already have been set to follow what the fabric
1293          * passes for the original expected data transfer length.
1294          */
1295         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1296                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1297                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1298                 return TCM_INVALID_CDB_FIELD;
1299         }
1300
1301         cmd->t_data_sg = sgl;
1302         cmd->t_data_nents = sgl_count;
1303
1304         if (sgl_bidi && sgl_bidi_count) {
1305                 cmd->t_bidi_data_sg = sgl_bidi;
1306                 cmd->t_bidi_data_nents = sgl_bidi_count;
1307         }
1308         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1309         return 0;
1310 }
1311
1312 /*
1313  * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1314  *                       se_cmd + use pre-allocated SGL memory.
1315  *
1316  * @se_cmd: command descriptor to submit
1317  * @se_sess: associated se_sess for endpoint
1318  * @cdb: pointer to SCSI CDB
1319  * @sense: pointer to SCSI sense buffer
1320  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1321  * @data_length: fabric expected data transfer length
1322  * @task_addr: SAM task attribute
1323  * @data_dir: DMA data direction
1324  * @flags: flags for command submission from target_sc_flags_tables
1325  * @sgl: struct scatterlist memory for unidirectional mapping
1326  * @sgl_count: scatterlist count for unidirectional mapping
1327  * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1328  * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1329  * @sgl_prot: struct scatterlist memory protection information
1330  * @sgl_prot_count: scatterlist count for protection information
1331  *
1332  * Returns non zero to signal active I/O shutdown failure.  All other
1333  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1334  * but still return zero here.
1335  *
1336  * This may only be called from process context, and also currently
1337  * assumes internal allocation of fabric payload buffer by target-core.
1338  */
1339 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1340                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1341                 u32 data_length, int task_attr, int data_dir, int flags,
1342                 struct scatterlist *sgl, u32 sgl_count,
1343                 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1344                 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1345 {
1346         struct se_portal_group *se_tpg;
1347         sense_reason_t rc;
1348         int ret;
1349
1350         se_tpg = se_sess->se_tpg;
1351         BUG_ON(!se_tpg);
1352         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1353         BUG_ON(in_interrupt());
1354         /*
1355          * Initialize se_cmd for target operation.  From this point
1356          * exceptions are handled by sending exception status via
1357          * target_core_fabric_ops->queue_status() callback
1358          */
1359         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1360                                 data_length, data_dir, task_attr, sense);
1361         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1362                 se_cmd->unknown_data_length = 1;
1363         /*
1364          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1365          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1366          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1367          * kref_put() to happen during fabric packet acknowledgement.
1368          */
1369         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1370         if (ret)
1371                 return ret;
1372         /*
1373          * Signal bidirectional data payloads to target-core
1374          */
1375         if (flags & TARGET_SCF_BIDI_OP)
1376                 se_cmd->se_cmd_flags |= SCF_BIDI;
1377         /*
1378          * Locate se_lun pointer and attach it to struct se_cmd
1379          */
1380         rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1381         if (rc) {
1382                 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1383                 target_put_sess_cmd(se_sess, se_cmd);
1384                 return 0;
1385         }
1386         /*
1387          * Save pointers for SGLs containing protection information,
1388          * if present.
1389          */
1390         if (sgl_prot_count) {
1391                 se_cmd->t_prot_sg = sgl_prot;
1392                 se_cmd->t_prot_nents = sgl_prot_count;
1393         }
1394
1395         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1396         if (rc != 0) {
1397                 transport_generic_request_failure(se_cmd, rc);
1398                 return 0;
1399         }
1400         /*
1401          * When a non zero sgl_count has been passed perform SGL passthrough
1402          * mapping for pre-allocated fabric memory instead of having target
1403          * core perform an internal SGL allocation..
1404          */
1405         if (sgl_count != 0) {
1406                 BUG_ON(!sgl);
1407
1408                 /*
1409                  * A work-around for tcm_loop as some userspace code via
1410                  * scsi-generic do not memset their associated read buffers,
1411                  * so go ahead and do that here for type non-data CDBs.  Also
1412                  * note that this is currently guaranteed to be a single SGL
1413                  * for this case by target core in target_setup_cmd_from_cdb()
1414                  * -> transport_generic_cmd_sequencer().
1415                  */
1416                 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1417                      se_cmd->data_direction == DMA_FROM_DEVICE) {
1418                         unsigned char *buf = NULL;
1419
1420                         if (sgl)
1421                                 buf = kmap(sg_page(sgl)) + sgl->offset;
1422
1423                         if (buf) {
1424                                 memset(buf, 0, sgl->length);
1425                                 kunmap(sg_page(sgl));
1426                         }
1427                 }
1428
1429                 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1430                                 sgl_bidi, sgl_bidi_count);
1431                 if (rc != 0) {
1432                         transport_generic_request_failure(se_cmd, rc);
1433                         return 0;
1434                 }
1435         }
1436
1437         /*
1438          * Check if we need to delay processing because of ALUA
1439          * Active/NonOptimized primary access state..
1440          */
1441         core_alua_check_nonop_delay(se_cmd);
1442
1443         transport_handle_cdb_direct(se_cmd);
1444         return 0;
1445 }
1446 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1447
1448 /*
1449  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1450  *
1451  * @se_cmd: command descriptor to submit
1452  * @se_sess: associated se_sess for endpoint
1453  * @cdb: pointer to SCSI CDB
1454  * @sense: pointer to SCSI sense buffer
1455  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1456  * @data_length: fabric expected data transfer length
1457  * @task_addr: SAM task attribute
1458  * @data_dir: DMA data direction
1459  * @flags: flags for command submission from target_sc_flags_tables
1460  *
1461  * Returns non zero to signal active I/O shutdown failure.  All other
1462  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1463  * but still return zero here.
1464  *
1465  * This may only be called from process context, and also currently
1466  * assumes internal allocation of fabric payload buffer by target-core.
1467  *
1468  * It also assumes interal target core SGL memory allocation.
1469  */
1470 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1471                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1472                 u32 data_length, int task_attr, int data_dir, int flags)
1473 {
1474         return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1475                         unpacked_lun, data_length, task_attr, data_dir,
1476                         flags, NULL, 0, NULL, 0, NULL, 0);
1477 }
1478 EXPORT_SYMBOL(target_submit_cmd);
1479
1480 static void target_complete_tmr_failure(struct work_struct *work)
1481 {
1482         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1483
1484         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1485         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1486
1487         transport_cmd_check_stop_to_fabric(se_cmd);
1488 }
1489
1490 /**
1491  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1492  *                     for TMR CDBs
1493  *
1494  * @se_cmd: command descriptor to submit
1495  * @se_sess: associated se_sess for endpoint
1496  * @sense: pointer to SCSI sense buffer
1497  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1498  * @fabric_context: fabric context for TMR req
1499  * @tm_type: Type of TM request
1500  * @gfp: gfp type for caller
1501  * @tag: referenced task tag for TMR_ABORT_TASK
1502  * @flags: submit cmd flags
1503  *
1504  * Callable from all contexts.
1505  **/
1506
1507 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1508                 unsigned char *sense, u32 unpacked_lun,
1509                 void *fabric_tmr_ptr, unsigned char tm_type,
1510                 gfp_t gfp, unsigned int tag, int flags)
1511 {
1512         struct se_portal_group *se_tpg;
1513         int ret;
1514
1515         se_tpg = se_sess->se_tpg;
1516         BUG_ON(!se_tpg);
1517
1518         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1519                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1520         /*
1521          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1522          * allocation failure.
1523          */
1524         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1525         if (ret < 0)
1526                 return -ENOMEM;
1527
1528         if (tm_type == TMR_ABORT_TASK)
1529                 se_cmd->se_tmr_req->ref_task_tag = tag;
1530
1531         /* See target_submit_cmd for commentary */
1532         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1533         if (ret) {
1534                 core_tmr_release_req(se_cmd->se_tmr_req);
1535                 return ret;
1536         }
1537
1538         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1539         if (ret) {
1540                 /*
1541                  * For callback during failure handling, push this work off
1542                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1543                  */
1544                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1545                 schedule_work(&se_cmd->work);
1546                 return 0;
1547         }
1548         transport_generic_handle_tmr(se_cmd);
1549         return 0;
1550 }
1551 EXPORT_SYMBOL(target_submit_tmr);
1552
1553 /*
1554  * If the cmd is active, request it to be stopped and sleep until it
1555  * has completed.
1556  */
1557 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1558 {
1559         bool was_active = false;
1560
1561         if (cmd->transport_state & CMD_T_BUSY) {
1562                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1563                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1564
1565                 pr_debug("cmd %p waiting to complete\n", cmd);
1566                 wait_for_completion(&cmd->task_stop_comp);
1567                 pr_debug("cmd %p stopped successfully\n", cmd);
1568
1569                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1570                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1571                 cmd->transport_state &= ~CMD_T_BUSY;
1572                 was_active = true;
1573         }
1574
1575         return was_active;
1576 }
1577
1578 /*
1579  * Handle SAM-esque emulation for generic transport request failures.
1580  */
1581 void transport_generic_request_failure(struct se_cmd *cmd,
1582                 sense_reason_t sense_reason)
1583 {
1584         int ret = 0;
1585
1586         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1587                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1588                 cmd->t_task_cdb[0]);
1589         pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1590                 cmd->se_tfo->get_cmd_state(cmd),
1591                 cmd->t_state, sense_reason);
1592         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1593                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1594                 (cmd->transport_state & CMD_T_STOP) != 0,
1595                 (cmd->transport_state & CMD_T_SENT) != 0);
1596
1597         /*
1598          * For SAM Task Attribute emulation for failed struct se_cmd
1599          */
1600         transport_complete_task_attr(cmd);
1601         /*
1602          * Handle special case for COMPARE_AND_WRITE failure, where the
1603          * callback is expected to drop the per device ->caw_mutex.
1604          */
1605         if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1606              cmd->transport_complete_callback)
1607                 cmd->transport_complete_callback(cmd);
1608
1609         switch (sense_reason) {
1610         case TCM_NON_EXISTENT_LUN:
1611         case TCM_UNSUPPORTED_SCSI_OPCODE:
1612         case TCM_INVALID_CDB_FIELD:
1613         case TCM_INVALID_PARAMETER_LIST:
1614         case TCM_PARAMETER_LIST_LENGTH_ERROR:
1615         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1616         case TCM_UNKNOWN_MODE_PAGE:
1617         case TCM_WRITE_PROTECTED:
1618         case TCM_ADDRESS_OUT_OF_RANGE:
1619         case TCM_CHECK_CONDITION_ABORT_CMD:
1620         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1621         case TCM_CHECK_CONDITION_NOT_READY:
1622         case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1623         case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1624         case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1625                 break;
1626         case TCM_OUT_OF_RESOURCES:
1627                 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1628                 break;
1629         case TCM_RESERVATION_CONFLICT:
1630                 /*
1631                  * No SENSE Data payload for this case, set SCSI Status
1632                  * and queue the response to $FABRIC_MOD.
1633                  *
1634                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1635                  */
1636                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1637                 /*
1638                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1639                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1640                  * CONFLICT STATUS.
1641                  *
1642                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1643                  */
1644                 if (cmd->se_sess &&
1645                     cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1646                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1647                                 cmd->orig_fe_lun, 0x2C,
1648                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1649
1650                 trace_target_cmd_complete(cmd);
1651                 ret = cmd->se_tfo-> queue_status(cmd);
1652                 if (ret == -EAGAIN || ret == -ENOMEM)
1653                         goto queue_full;
1654                 goto check_stop;
1655         default:
1656                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1657                         cmd->t_task_cdb[0], sense_reason);
1658                 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1659                 break;
1660         }
1661
1662         ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1663         if (ret == -EAGAIN || ret == -ENOMEM)
1664                 goto queue_full;
1665
1666 check_stop:
1667         transport_lun_remove_cmd(cmd);
1668         if (!transport_cmd_check_stop_to_fabric(cmd))
1669                 ;
1670         return;
1671
1672 queue_full:
1673         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1674         transport_handle_queue_full(cmd, cmd->se_dev);
1675 }
1676 EXPORT_SYMBOL(transport_generic_request_failure);
1677
1678 void __target_execute_cmd(struct se_cmd *cmd)
1679 {
1680         sense_reason_t ret;
1681
1682         if (cmd->execute_cmd) {
1683                 ret = cmd->execute_cmd(cmd);
1684                 if (ret) {
1685                         spin_lock_irq(&cmd->t_state_lock);
1686                         cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1687                         spin_unlock_irq(&cmd->t_state_lock);
1688
1689                         transport_generic_request_failure(cmd, ret);
1690                 }
1691         }
1692 }
1693
1694 static bool target_handle_task_attr(struct se_cmd *cmd)
1695 {
1696         struct se_device *dev = cmd->se_dev;
1697
1698         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1699                 return false;
1700
1701         /*
1702          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1703          * to allow the passed struct se_cmd list of tasks to the front of the list.
1704          */
1705         switch (cmd->sam_task_attr) {
1706         case MSG_HEAD_TAG:
1707                 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1708                          "se_ordered_id: %u\n",
1709                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1710                 return false;
1711         case MSG_ORDERED_TAG:
1712                 atomic_inc(&dev->dev_ordered_sync);
1713                 smp_mb__after_atomic_inc();
1714
1715                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1716                          " se_ordered_id: %u\n",
1717                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1718
1719                 /*
1720                  * Execute an ORDERED command if no other older commands
1721                  * exist that need to be completed first.
1722                  */
1723                 if (!atomic_read(&dev->simple_cmds))
1724                         return false;
1725                 break;
1726         default:
1727                 /*
1728                  * For SIMPLE and UNTAGGED Task Attribute commands
1729                  */
1730                 atomic_inc(&dev->simple_cmds);
1731                 smp_mb__after_atomic_inc();
1732                 break;
1733         }
1734
1735         if (atomic_read(&dev->dev_ordered_sync) == 0)
1736                 return false;
1737
1738         spin_lock(&dev->delayed_cmd_lock);
1739         list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1740         spin_unlock(&dev->delayed_cmd_lock);
1741
1742         pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1743                 " delayed CMD list, se_ordered_id: %u\n",
1744                 cmd->t_task_cdb[0], cmd->sam_task_attr,
1745                 cmd->se_ordered_id);
1746         return true;
1747 }
1748
1749 void target_execute_cmd(struct se_cmd *cmd)
1750 {
1751         /*
1752          * If the received CDB has aleady been aborted stop processing it here.
1753          */
1754         if (transport_check_aborted_status(cmd, 1))
1755                 return;
1756
1757         /*
1758          * Determine if frontend context caller is requesting the stopping of
1759          * this command for frontend exceptions.
1760          */
1761         spin_lock_irq(&cmd->t_state_lock);
1762         if (cmd->transport_state & CMD_T_STOP) {
1763                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1764                         __func__, __LINE__,
1765                         cmd->se_tfo->get_task_tag(cmd));
1766
1767                 spin_unlock_irq(&cmd->t_state_lock);
1768                 complete_all(&cmd->t_transport_stop_comp);
1769                 return;
1770         }
1771
1772         cmd->t_state = TRANSPORT_PROCESSING;
1773         cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1774         spin_unlock_irq(&cmd->t_state_lock);
1775
1776         if (target_handle_task_attr(cmd)) {
1777                 spin_lock_irq(&cmd->t_state_lock);
1778                 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1779                 spin_unlock_irq(&cmd->t_state_lock);
1780                 return;
1781         }
1782
1783         __target_execute_cmd(cmd);
1784 }
1785 EXPORT_SYMBOL(target_execute_cmd);
1786
1787 /*
1788  * Process all commands up to the last received ORDERED task attribute which
1789  * requires another blocking boundary
1790  */
1791 static void target_restart_delayed_cmds(struct se_device *dev)
1792 {
1793         for (;;) {
1794                 struct se_cmd *cmd;
1795
1796                 spin_lock(&dev->delayed_cmd_lock);
1797                 if (list_empty(&dev->delayed_cmd_list)) {
1798                         spin_unlock(&dev->delayed_cmd_lock);
1799                         break;
1800                 }
1801
1802                 cmd = list_entry(dev->delayed_cmd_list.next,
1803                                  struct se_cmd, se_delayed_node);
1804                 list_del(&cmd->se_delayed_node);
1805                 spin_unlock(&dev->delayed_cmd_lock);
1806
1807                 __target_execute_cmd(cmd);
1808
1809                 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1810                         break;
1811         }
1812 }
1813
1814 /*
1815  * Called from I/O completion to determine which dormant/delayed
1816  * and ordered cmds need to have their tasks added to the execution queue.
1817  */
1818 static void transport_complete_task_attr(struct se_cmd *cmd)
1819 {
1820         struct se_device *dev = cmd->se_dev;
1821
1822         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1823                 return;
1824
1825         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1826                 atomic_dec(&dev->simple_cmds);
1827                 smp_mb__after_atomic_dec();
1828                 dev->dev_cur_ordered_id++;
1829                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1830                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1831                         cmd->se_ordered_id);
1832         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1833                 dev->dev_cur_ordered_id++;
1834                 pr_debug("Incremented dev_cur_ordered_id: %u for"
1835                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1836                         cmd->se_ordered_id);
1837         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1838                 atomic_dec(&dev->dev_ordered_sync);
1839                 smp_mb__after_atomic_dec();
1840
1841                 dev->dev_cur_ordered_id++;
1842                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1843                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1844         }
1845
1846         target_restart_delayed_cmds(dev);
1847 }
1848
1849 static void transport_complete_qf(struct se_cmd *cmd)
1850 {
1851         int ret = 0;
1852
1853         transport_complete_task_attr(cmd);
1854
1855         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1856                 trace_target_cmd_complete(cmd);
1857                 ret = cmd->se_tfo->queue_status(cmd);
1858                 if (ret)
1859                         goto out;
1860         }
1861
1862         switch (cmd->data_direction) {
1863         case DMA_FROM_DEVICE:
1864                 trace_target_cmd_complete(cmd);
1865                 ret = cmd->se_tfo->queue_data_in(cmd);
1866                 break;
1867         case DMA_TO_DEVICE:
1868                 if (cmd->se_cmd_flags & SCF_BIDI) {
1869                         ret = cmd->se_tfo->queue_data_in(cmd);
1870                         if (ret < 0)
1871                                 break;
1872                 }
1873                 /* Fall through for DMA_TO_DEVICE */
1874         case DMA_NONE:
1875                 trace_target_cmd_complete(cmd);
1876                 ret = cmd->se_tfo->queue_status(cmd);
1877                 break;
1878         default:
1879                 break;
1880         }
1881
1882 out:
1883         if (ret < 0) {
1884                 transport_handle_queue_full(cmd, cmd->se_dev);
1885                 return;
1886         }
1887         transport_lun_remove_cmd(cmd);
1888         transport_cmd_check_stop_to_fabric(cmd);
1889 }
1890
1891 static void transport_handle_queue_full(
1892         struct se_cmd *cmd,
1893         struct se_device *dev)
1894 {
1895         spin_lock_irq(&dev->qf_cmd_lock);
1896         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1897         atomic_inc(&dev->dev_qf_count);
1898         smp_mb__after_atomic_inc();
1899         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1900
1901         schedule_work(&cmd->se_dev->qf_work_queue);
1902 }
1903
1904 static void target_complete_ok_work(struct work_struct *work)
1905 {
1906         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1907         int ret;
1908
1909         /*
1910          * Check if we need to move delayed/dormant tasks from cmds on the
1911          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1912          * Attribute.
1913          */
1914         transport_complete_task_attr(cmd);
1915
1916         /*
1917          * Check to schedule QUEUE_FULL work, or execute an existing
1918          * cmd->transport_qf_callback()
1919          */
1920         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1921                 schedule_work(&cmd->se_dev->qf_work_queue);
1922
1923         /*
1924          * Check if we need to send a sense buffer from
1925          * the struct se_cmd in question.
1926          */
1927         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1928                 WARN_ON(!cmd->scsi_status);
1929                 ret = transport_send_check_condition_and_sense(
1930                                         cmd, 0, 1);
1931                 if (ret == -EAGAIN || ret == -ENOMEM)
1932                         goto queue_full;
1933
1934                 transport_lun_remove_cmd(cmd);
1935                 transport_cmd_check_stop_to_fabric(cmd);
1936                 return;
1937         }
1938         /*
1939          * Check for a callback, used by amongst other things
1940          * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1941          */
1942         if (cmd->transport_complete_callback) {
1943                 sense_reason_t rc;
1944
1945                 rc = cmd->transport_complete_callback(cmd);
1946                 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
1947                         return;
1948                 } else if (rc) {
1949                         ret = transport_send_check_condition_and_sense(cmd,
1950                                                 rc, 0);
1951                         if (ret == -EAGAIN || ret == -ENOMEM)
1952                                 goto queue_full;
1953
1954                         transport_lun_remove_cmd(cmd);
1955                         transport_cmd_check_stop_to_fabric(cmd);
1956                         return;
1957                 }
1958         }
1959
1960         switch (cmd->data_direction) {
1961         case DMA_FROM_DEVICE:
1962                 spin_lock(&cmd->se_lun->lun_sep_lock);
1963                 if (cmd->se_lun->lun_sep) {
1964                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1965                                         cmd->data_length;
1966                 }
1967                 spin_unlock(&cmd->se_lun->lun_sep_lock);
1968
1969                 trace_target_cmd_complete(cmd);
1970                 ret = cmd->se_tfo->queue_data_in(cmd);
1971                 if (ret == -EAGAIN || ret == -ENOMEM)
1972                         goto queue_full;
1973                 break;
1974         case DMA_TO_DEVICE:
1975                 spin_lock(&cmd->se_lun->lun_sep_lock);
1976                 if (cmd->se_lun->lun_sep) {
1977                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
1978                                 cmd->data_length;
1979                 }
1980                 spin_unlock(&cmd->se_lun->lun_sep_lock);
1981                 /*
1982                  * Check if we need to send READ payload for BIDI-COMMAND
1983                  */
1984                 if (cmd->se_cmd_flags & SCF_BIDI) {
1985                         spin_lock(&cmd->se_lun->lun_sep_lock);
1986                         if (cmd->se_lun->lun_sep) {
1987                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1988                                         cmd->data_length;
1989                         }
1990                         spin_unlock(&cmd->se_lun->lun_sep_lock);
1991                         ret = cmd->se_tfo->queue_data_in(cmd);
1992                         if (ret == -EAGAIN || ret == -ENOMEM)
1993                                 goto queue_full;
1994                         break;
1995                 }
1996                 /* Fall through for DMA_TO_DEVICE */
1997         case DMA_NONE:
1998                 trace_target_cmd_complete(cmd);
1999                 ret = cmd->se_tfo->queue_status(cmd);
2000                 if (ret == -EAGAIN || ret == -ENOMEM)
2001                         goto queue_full;
2002                 break;
2003         default:
2004                 break;
2005         }
2006
2007         transport_lun_remove_cmd(cmd);
2008         transport_cmd_check_stop_to_fabric(cmd);
2009         return;
2010
2011 queue_full:
2012         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2013                 " data_direction: %d\n", cmd, cmd->data_direction);
2014         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2015         transport_handle_queue_full(cmd, cmd->se_dev);
2016 }
2017
2018 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2019 {
2020         struct scatterlist *sg;
2021         int count;
2022
2023         for_each_sg(sgl, sg, nents, count)
2024                 __free_page(sg_page(sg));
2025
2026         kfree(sgl);
2027 }
2028
2029 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2030 {
2031         /*
2032          * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2033          * emulation, and free + reset pointers if necessary..
2034          */
2035         if (!cmd->t_data_sg_orig)
2036                 return;
2037
2038         kfree(cmd->t_data_sg);
2039         cmd->t_data_sg = cmd->t_data_sg_orig;
2040         cmd->t_data_sg_orig = NULL;
2041         cmd->t_data_nents = cmd->t_data_nents_orig;
2042         cmd->t_data_nents_orig = 0;
2043 }
2044
2045 static inline void transport_free_pages(struct se_cmd *cmd)
2046 {
2047         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2048                 transport_reset_sgl_orig(cmd);
2049                 return;
2050         }
2051         transport_reset_sgl_orig(cmd);
2052
2053         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2054         cmd->t_data_sg = NULL;
2055         cmd->t_data_nents = 0;
2056
2057         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2058         cmd->t_bidi_data_sg = NULL;
2059         cmd->t_bidi_data_nents = 0;
2060 }
2061
2062 /**
2063  * transport_release_cmd - free a command
2064  * @cmd:       command to free
2065  *
2066  * This routine unconditionally frees a command, and reference counting
2067  * or list removal must be done in the caller.
2068  */
2069 static int transport_release_cmd(struct se_cmd *cmd)
2070 {
2071         BUG_ON(!cmd->se_tfo);
2072
2073         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2074                 core_tmr_release_req(cmd->se_tmr_req);
2075         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2076                 kfree(cmd->t_task_cdb);
2077         /*
2078          * If this cmd has been setup with target_get_sess_cmd(), drop
2079          * the kref and call ->release_cmd() in kref callback.
2080          */
2081         return target_put_sess_cmd(cmd->se_sess, cmd);
2082 }
2083
2084 /**
2085  * transport_put_cmd - release a reference to a command
2086  * @cmd:       command to release
2087  *
2088  * This routine releases our reference to the command and frees it if possible.
2089  */
2090 static int transport_put_cmd(struct se_cmd *cmd)
2091 {
2092         transport_free_pages(cmd);
2093         return transport_release_cmd(cmd);
2094 }
2095
2096 void *transport_kmap_data_sg(struct se_cmd *cmd)
2097 {
2098         struct scatterlist *sg = cmd->t_data_sg;
2099         struct page **pages;
2100         int i;
2101
2102         /*
2103          * We need to take into account a possible offset here for fabrics like
2104          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2105          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2106          */
2107         if (!cmd->t_data_nents)
2108                 return NULL;
2109
2110         BUG_ON(!sg);
2111         if (cmd->t_data_nents == 1)
2112                 return kmap(sg_page(sg)) + sg->offset;
2113
2114         /* >1 page. use vmap */
2115         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2116         if (!pages)
2117                 return NULL;
2118
2119         /* convert sg[] to pages[] */
2120         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2121                 pages[i] = sg_page(sg);
2122         }
2123
2124         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2125         kfree(pages);
2126         if (!cmd->t_data_vmap)
2127                 return NULL;
2128
2129         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2130 }
2131 EXPORT_SYMBOL(transport_kmap_data_sg);
2132
2133 void transport_kunmap_data_sg(struct se_cmd *cmd)
2134 {
2135         if (!cmd->t_data_nents) {
2136                 return;
2137         } else if (cmd->t_data_nents == 1) {
2138                 kunmap(sg_page(cmd->t_data_sg));
2139                 return;
2140         }
2141
2142         vunmap(cmd->t_data_vmap);
2143         cmd->t_data_vmap = NULL;
2144 }
2145 EXPORT_SYMBOL(transport_kunmap_data_sg);
2146
2147 int
2148 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2149                  bool zero_page)
2150 {
2151         struct scatterlist *sg;
2152         struct page *page;
2153         gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2154         unsigned int nent;
2155         int i = 0;
2156
2157         nent = DIV_ROUND_UP(length, PAGE_SIZE);
2158         sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2159         if (!sg)
2160                 return -ENOMEM;
2161
2162         sg_init_table(sg, nent);
2163
2164         while (length) {
2165                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2166                 page = alloc_page(GFP_KERNEL | zero_flag);
2167                 if (!page)
2168                         goto out;
2169
2170                 sg_set_page(&sg[i], page, page_len, 0);
2171                 length -= page_len;
2172                 i++;
2173         }
2174         *sgl = sg;
2175         *nents = nent;
2176         return 0;
2177
2178 out:
2179         while (i > 0) {
2180                 i--;
2181                 __free_page(sg_page(&sg[i]));
2182         }
2183         kfree(sg);
2184         return -ENOMEM;
2185 }
2186
2187 /*
2188  * Allocate any required resources to execute the command.  For writes we
2189  * might not have the payload yet, so notify the fabric via a call to
2190  * ->write_pending instead. Otherwise place it on the execution queue.
2191  */
2192 sense_reason_t
2193 transport_generic_new_cmd(struct se_cmd *cmd)
2194 {
2195         int ret = 0;
2196
2197         /*
2198          * Determine is the TCM fabric module has already allocated physical
2199          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2200          * beforehand.
2201          */
2202         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2203             cmd->data_length) {
2204                 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2205
2206                 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2207                     (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2208                         u32 bidi_length;
2209
2210                         if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2211                                 bidi_length = cmd->t_task_nolb *
2212                                               cmd->se_dev->dev_attrib.block_size;
2213                         else
2214                                 bidi_length = cmd->data_length;
2215
2216                         ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2217                                                &cmd->t_bidi_data_nents,
2218                                                bidi_length, zero_flag);
2219                         if (ret < 0)
2220                                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2221                 }
2222
2223                 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2224                                        cmd->data_length, zero_flag);
2225                 if (ret < 0)
2226                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2227         }
2228         /*
2229          * If this command is not a write we can execute it right here,
2230          * for write buffers we need to notify the fabric driver first
2231          * and let it call back once the write buffers are ready.
2232          */
2233         target_add_to_state_list(cmd);
2234         if (cmd->data_direction != DMA_TO_DEVICE) {
2235                 target_execute_cmd(cmd);
2236                 return 0;
2237         }
2238         transport_cmd_check_stop(cmd, false, true);
2239
2240         ret = cmd->se_tfo->write_pending(cmd);
2241         if (ret == -EAGAIN || ret == -ENOMEM)
2242                 goto queue_full;
2243
2244         /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2245         WARN_ON(ret);
2246
2247         return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2248
2249 queue_full:
2250         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2251         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2252         transport_handle_queue_full(cmd, cmd->se_dev);
2253         return 0;
2254 }
2255 EXPORT_SYMBOL(transport_generic_new_cmd);
2256
2257 static void transport_write_pending_qf(struct se_cmd *cmd)
2258 {
2259         int ret;
2260
2261         ret = cmd->se_tfo->write_pending(cmd);
2262         if (ret == -EAGAIN || ret == -ENOMEM) {
2263                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2264                          cmd);
2265                 transport_handle_queue_full(cmd, cmd->se_dev);
2266         }
2267 }
2268
2269 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2270 {
2271         unsigned long flags;
2272         int ret = 0;
2273
2274         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2275                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2276                          transport_wait_for_tasks(cmd);
2277
2278                 ret = transport_release_cmd(cmd);
2279         } else {
2280                 if (wait_for_tasks)
2281                         transport_wait_for_tasks(cmd);
2282                 /*
2283                  * Handle WRITE failure case where transport_generic_new_cmd()
2284                  * has already added se_cmd to state_list, but fabric has
2285                  * failed command before I/O submission.
2286                  */
2287                 if (cmd->state_active) {
2288                         spin_lock_irqsave(&cmd->t_state_lock, flags);
2289                         target_remove_from_state_list(cmd);
2290                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2291                 }
2292
2293                 if (cmd->se_lun)
2294                         transport_lun_remove_cmd(cmd);
2295
2296                 ret = transport_put_cmd(cmd);
2297         }
2298         return ret;
2299 }
2300 EXPORT_SYMBOL(transport_generic_free_cmd);
2301
2302 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2303  * @se_sess:    session to reference
2304  * @se_cmd:     command descriptor to add
2305  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2306  */
2307 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2308                                bool ack_kref)
2309 {
2310         unsigned long flags;
2311         int ret = 0;
2312
2313         /*
2314          * Add a second kref if the fabric caller is expecting to handle
2315          * fabric acknowledgement that requires two target_put_sess_cmd()
2316          * invocations before se_cmd descriptor release.
2317          */
2318         if (ack_kref == true) {
2319                 kref_get(&se_cmd->cmd_kref);
2320                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2321         }
2322
2323         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2324         if (se_sess->sess_tearing_down) {
2325                 ret = -ESHUTDOWN;
2326                 goto out;
2327         }
2328         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2329 out:
2330         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2331         return ret;
2332 }
2333 EXPORT_SYMBOL(target_get_sess_cmd);
2334
2335 static void target_release_cmd_kref(struct kref *kref)
2336 {
2337         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2338         struct se_session *se_sess = se_cmd->se_sess;
2339
2340         if (list_empty(&se_cmd->se_cmd_list)) {
2341                 spin_unlock(&se_sess->sess_cmd_lock);
2342                 se_cmd->se_tfo->release_cmd(se_cmd);
2343                 return;
2344         }
2345         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2346                 spin_unlock(&se_sess->sess_cmd_lock);
2347                 complete(&se_cmd->cmd_wait_comp);
2348                 return;
2349         }
2350         list_del(&se_cmd->se_cmd_list);
2351         spin_unlock(&se_sess->sess_cmd_lock);
2352
2353         se_cmd->se_tfo->release_cmd(se_cmd);
2354 }
2355
2356 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2357  * @se_sess:    session to reference
2358  * @se_cmd:     command descriptor to drop
2359  */
2360 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2361 {
2362         if (!se_sess) {
2363                 se_cmd->se_tfo->release_cmd(se_cmd);
2364                 return 1;
2365         }
2366         return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2367                         &se_sess->sess_cmd_lock);
2368 }
2369 EXPORT_SYMBOL(target_put_sess_cmd);
2370
2371 /* target_sess_cmd_list_set_waiting - Flag all commands in
2372  *         sess_cmd_list to complete cmd_wait_comp.  Set
2373  *         sess_tearing_down so no more commands are queued.
2374  * @se_sess:    session to flag
2375  */
2376 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2377 {
2378         struct se_cmd *se_cmd;
2379         unsigned long flags;
2380
2381         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2382         if (se_sess->sess_tearing_down) {
2383                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2384                 return;
2385         }
2386         se_sess->sess_tearing_down = 1;
2387         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2388
2389         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2390                 se_cmd->cmd_wait_set = 1;
2391
2392         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2393 }
2394 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2395
2396 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2397  * @se_sess:    session to wait for active I/O
2398  */
2399 void target_wait_for_sess_cmds(struct se_session *se_sess)
2400 {
2401         struct se_cmd *se_cmd, *tmp_cmd;
2402         unsigned long flags;
2403
2404         list_for_each_entry_safe(se_cmd, tmp_cmd,
2405                                 &se_sess->sess_wait_list, se_cmd_list) {
2406                 list_del(&se_cmd->se_cmd_list);
2407
2408                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2409                         " %d\n", se_cmd, se_cmd->t_state,
2410                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2411
2412                 wait_for_completion(&se_cmd->cmd_wait_comp);
2413                 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2414                         " fabric state: %d\n", se_cmd, se_cmd->t_state,
2415                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2416
2417                 se_cmd->se_tfo->release_cmd(se_cmd);
2418         }
2419
2420         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2421         WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2422         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2423
2424 }
2425 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2426
2427 static int transport_clear_lun_ref_thread(void *p)
2428 {
2429         struct se_lun *lun = p;
2430
2431         percpu_ref_kill(&lun->lun_ref);
2432
2433         wait_for_completion(&lun->lun_ref_comp);
2434         complete(&lun->lun_shutdown_comp);
2435
2436         return 0;
2437 }
2438
2439 int transport_clear_lun_ref(struct se_lun *lun)
2440 {
2441         struct task_struct *kt;
2442
2443         kt = kthread_run(transport_clear_lun_ref_thread, lun,
2444                         "tcm_cl_%u", lun->unpacked_lun);
2445         if (IS_ERR(kt)) {
2446                 pr_err("Unable to start clear_lun thread\n");
2447                 return PTR_ERR(kt);
2448         }
2449         wait_for_completion(&lun->lun_shutdown_comp);
2450
2451         return 0;
2452 }
2453
2454 /**
2455  * transport_wait_for_tasks - wait for completion to occur
2456  * @cmd:        command to wait
2457  *
2458  * Called from frontend fabric context to wait for storage engine
2459  * to pause and/or release frontend generated struct se_cmd.
2460  */
2461 bool transport_wait_for_tasks(struct se_cmd *cmd)
2462 {
2463         unsigned long flags;
2464
2465         spin_lock_irqsave(&cmd->t_state_lock, flags);
2466         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2467             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2468                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2469                 return false;
2470         }
2471
2472         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2473             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2474                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2475                 return false;
2476         }
2477
2478         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2479                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2480                 return false;
2481         }
2482
2483         cmd->transport_state |= CMD_T_STOP;
2484
2485         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2486                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2487                 cmd, cmd->se_tfo->get_task_tag(cmd),
2488                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2489
2490         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2491
2492         wait_for_completion(&cmd->t_transport_stop_comp);
2493
2494         spin_lock_irqsave(&cmd->t_state_lock, flags);
2495         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2496
2497         pr_debug("wait_for_tasks: Stopped wait_for_completion("
2498                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2499                 cmd->se_tfo->get_task_tag(cmd));
2500
2501         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2502
2503         return true;
2504 }
2505 EXPORT_SYMBOL(transport_wait_for_tasks);
2506
2507 static int transport_get_sense_codes(
2508         struct se_cmd *cmd,
2509         u8 *asc,
2510         u8 *ascq)
2511 {
2512         *asc = cmd->scsi_asc;
2513         *ascq = cmd->scsi_ascq;
2514
2515         return 0;
2516 }
2517
2518 static
2519 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2520 {
2521         /* Place failed LBA in sense data information descriptor 0. */
2522         buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2523         buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2524         buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2525         buffer[SPC_VALIDITY_OFFSET] = 0x80;
2526
2527         /* Descriptor Information: failing sector */
2528         put_unaligned_be64(bad_sector, &buffer[12]);
2529 }
2530
2531 int
2532 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2533                 sense_reason_t reason, int from_transport)
2534 {
2535         unsigned char *buffer = cmd->sense_buffer;
2536         unsigned long flags;
2537         u8 asc = 0, ascq = 0;
2538
2539         spin_lock_irqsave(&cmd->t_state_lock, flags);
2540         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2541                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2542                 return 0;
2543         }
2544         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2545         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2546
2547         if (!reason && from_transport)
2548                 goto after_reason;
2549
2550         if (!from_transport)
2551                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2552
2553         /*
2554          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2555          * SENSE KEY values from include/scsi/scsi.h
2556          */
2557         switch (reason) {
2558         case TCM_NO_SENSE:
2559                 /* CURRENT ERROR */
2560                 buffer[0] = 0x70;
2561                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2562                 /* Not Ready */
2563                 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2564                 /* NO ADDITIONAL SENSE INFORMATION */
2565                 buffer[SPC_ASC_KEY_OFFSET] = 0;
2566                 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2567                 break;
2568         case TCM_NON_EXISTENT_LUN:
2569                 /* CURRENT ERROR */
2570                 buffer[0] = 0x70;
2571                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2572                 /* ILLEGAL REQUEST */
2573                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2574                 /* LOGICAL UNIT NOT SUPPORTED */
2575                 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2576                 break;
2577         case TCM_UNSUPPORTED_SCSI_OPCODE:
2578         case TCM_SECTOR_COUNT_TOO_MANY:
2579                 /* CURRENT ERROR */
2580                 buffer[0] = 0x70;
2581                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2582                 /* ILLEGAL REQUEST */
2583                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2584                 /* INVALID COMMAND OPERATION CODE */
2585                 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2586                 break;
2587         case TCM_UNKNOWN_MODE_PAGE:
2588                 /* CURRENT ERROR */
2589                 buffer[0] = 0x70;
2590                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2591                 /* ILLEGAL REQUEST */
2592                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2593                 /* INVALID FIELD IN CDB */
2594                 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2595                 break;
2596         case TCM_CHECK_CONDITION_ABORT_CMD:
2597                 /* CURRENT ERROR */
2598                 buffer[0] = 0x70;
2599                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2600                 /* ABORTED COMMAND */
2601                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2602                 /* BUS DEVICE RESET FUNCTION OCCURRED */
2603                 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2604                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2605                 break;
2606         case TCM_INCORRECT_AMOUNT_OF_DATA:
2607                 /* CURRENT ERROR */
2608                 buffer[0] = 0x70;
2609                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2610                 /* ABORTED COMMAND */
2611                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2612                 /* WRITE ERROR */
2613                 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2614                 /* NOT ENOUGH UNSOLICITED DATA */
2615                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2616                 break;
2617         case TCM_INVALID_CDB_FIELD:
2618                 /* CURRENT ERROR */
2619                 buffer[0] = 0x70;
2620                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2621                 /* ILLEGAL REQUEST */
2622                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2623                 /* INVALID FIELD IN CDB */
2624                 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2625                 break;
2626         case TCM_INVALID_PARAMETER_LIST:
2627                 /* CURRENT ERROR */
2628                 buffer[0] = 0x70;
2629                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2630                 /* ILLEGAL REQUEST */
2631                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2632                 /* INVALID FIELD IN PARAMETER LIST */
2633                 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2634                 break;
2635         case TCM_PARAMETER_LIST_LENGTH_ERROR:
2636                 /* CURRENT ERROR */
2637                 buffer[0] = 0x70;
2638                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2639                 /* ILLEGAL REQUEST */
2640                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2641                 /* PARAMETER LIST LENGTH ERROR */
2642                 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2643                 break;
2644         case TCM_UNEXPECTED_UNSOLICITED_DATA:
2645                 /* CURRENT ERROR */
2646                 buffer[0] = 0x70;
2647                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2648                 /* ABORTED COMMAND */
2649                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2650                 /* WRITE ERROR */
2651                 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2652                 /* UNEXPECTED_UNSOLICITED_DATA */
2653                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2654                 break;
2655         case TCM_SERVICE_CRC_ERROR:
2656                 /* CURRENT ERROR */
2657                 buffer[0] = 0x70;
2658                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2659                 /* ABORTED COMMAND */
2660                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2661                 /* PROTOCOL SERVICE CRC ERROR */
2662                 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2663                 /* N/A */
2664                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2665                 break;
2666         case TCM_SNACK_REJECTED:
2667                 /* CURRENT ERROR */
2668                 buffer[0] = 0x70;
2669                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2670                 /* ABORTED COMMAND */
2671                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2672                 /* READ ERROR */
2673                 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2674                 /* FAILED RETRANSMISSION REQUEST */
2675                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2676                 break;
2677         case TCM_WRITE_PROTECTED:
2678                 /* CURRENT ERROR */
2679                 buffer[0] = 0x70;
2680                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2681                 /* DATA PROTECT */
2682                 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2683                 /* WRITE PROTECTED */
2684                 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2685                 break;
2686         case TCM_ADDRESS_OUT_OF_RANGE:
2687                 /* CURRENT ERROR */
2688                 buffer[0] = 0x70;
2689                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2690                 /* ILLEGAL REQUEST */
2691                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2692                 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2693                 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2694                 break;
2695         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2696                 /* CURRENT ERROR */
2697                 buffer[0] = 0x70;
2698                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2699                 /* UNIT ATTENTION */
2700                 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2701                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2702                 buffer[SPC_ASC_KEY_OFFSET] = asc;
2703                 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2704                 break;
2705         case TCM_CHECK_CONDITION_NOT_READY:
2706                 /* CURRENT ERROR */
2707                 buffer[0] = 0x70;
2708                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2709                 /* Not Ready */
2710                 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2711                 transport_get_sense_codes(cmd, &asc, &ascq);
2712                 buffer[SPC_ASC_KEY_OFFSET] = asc;
2713                 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2714                 break;
2715         case TCM_MISCOMPARE_VERIFY:
2716                 /* CURRENT ERROR */
2717                 buffer[0] = 0x70;
2718                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2719                 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2720                 /* MISCOMPARE DURING VERIFY OPERATION */
2721                 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2722                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2723                 break;
2724         case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2725                 /* CURRENT ERROR */
2726                 buffer[0] = 0x70;
2727                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2728                 /* ILLEGAL REQUEST */
2729                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2730                 /* LOGICAL BLOCK GUARD CHECK FAILED */
2731                 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2732                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2733                 transport_err_sector_info(buffer, cmd->bad_sector);
2734                 break;
2735         case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2736                 /* CURRENT ERROR */
2737                 buffer[0] = 0x70;
2738                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2739                 /* ILLEGAL REQUEST */
2740                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2741                 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2742                 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2743                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2744                 transport_err_sector_info(buffer, cmd->bad_sector);
2745                 break;
2746         case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2747                 /* CURRENT ERROR */
2748                 buffer[0] = 0x70;
2749                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2750                 /* ILLEGAL REQUEST */
2751                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2752                 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2753                 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2754                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2755                 transport_err_sector_info(buffer, cmd->bad_sector);
2756                 break;
2757         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2758         default:
2759                 /* CURRENT ERROR */
2760                 buffer[0] = 0x70;
2761                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2762                 /*
2763                  * Returning ILLEGAL REQUEST would cause immediate IO errors on
2764                  * Solaris initiators.  Returning NOT READY instead means the
2765                  * operations will be retried a finite number of times and we
2766                  * can survive intermittent errors.
2767                  */
2768                 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2769                 /* LOGICAL UNIT COMMUNICATION FAILURE */
2770                 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2771                 break;
2772         }
2773         /*
2774          * This code uses linux/include/scsi/scsi.h SAM status codes!
2775          */
2776         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2777         /*
2778          * Automatically padded, this value is encoded in the fabric's
2779          * data_length response PDU containing the SCSI defined sense data.
2780          */
2781         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER;
2782
2783 after_reason:
2784         trace_target_cmd_complete(cmd);
2785         return cmd->se_tfo->queue_status(cmd);
2786 }
2787 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2788
2789 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2790 {
2791         if (!(cmd->transport_state & CMD_T_ABORTED))
2792                 return 0;
2793
2794         if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2795                 return 1;
2796
2797         pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2798                  cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2799
2800         cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2801         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2802         trace_target_cmd_complete(cmd);
2803         cmd->se_tfo->queue_status(cmd);
2804
2805         return 1;
2806 }
2807 EXPORT_SYMBOL(transport_check_aborted_status);
2808
2809 void transport_send_task_abort(struct se_cmd *cmd)
2810 {
2811         unsigned long flags;
2812
2813         spin_lock_irqsave(&cmd->t_state_lock, flags);
2814         if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
2815                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2816                 return;
2817         }
2818         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2819
2820         /*
2821          * If there are still expected incoming fabric WRITEs, we wait
2822          * until until they have completed before sending a TASK_ABORTED
2823          * response.  This response with TASK_ABORTED status will be
2824          * queued back to fabric module by transport_check_aborted_status().
2825          */
2826         if (cmd->data_direction == DMA_TO_DEVICE) {
2827                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2828                         cmd->transport_state |= CMD_T_ABORTED;
2829                         smp_mb__after_atomic_inc();
2830                         return;
2831                 }
2832         }
2833         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2834
2835         transport_lun_remove_cmd(cmd);
2836
2837         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2838                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2839                 cmd->se_tfo->get_task_tag(cmd));
2840
2841         trace_target_cmd_complete(cmd);
2842         cmd->se_tfo->queue_status(cmd);
2843 }
2844
2845 static void target_tmr_work(struct work_struct *work)
2846 {
2847         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2848         struct se_device *dev = cmd->se_dev;
2849         struct se_tmr_req *tmr = cmd->se_tmr_req;
2850         int ret;
2851
2852         switch (tmr->function) {
2853         case TMR_ABORT_TASK:
2854                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2855                 break;
2856         case TMR_ABORT_TASK_SET:
2857         case TMR_CLEAR_ACA:
2858         case TMR_CLEAR_TASK_SET:
2859                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2860                 break;
2861         case TMR_LUN_RESET:
2862                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2863                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2864                                          TMR_FUNCTION_REJECTED;
2865                 break;
2866         case TMR_TARGET_WARM_RESET:
2867                 tmr->response = TMR_FUNCTION_REJECTED;
2868                 break;
2869         case TMR_TARGET_COLD_RESET:
2870                 tmr->response = TMR_FUNCTION_REJECTED;
2871                 break;
2872         default:
2873                 pr_err("Uknown TMR function: 0x%02x.\n",
2874                                 tmr->function);
2875                 tmr->response = TMR_FUNCTION_REJECTED;
2876                 break;
2877         }
2878
2879         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2880         cmd->se_tfo->queue_tm_rsp(cmd);
2881
2882         transport_cmd_check_stop_to_fabric(cmd);
2883 }
2884
2885 int transport_generic_handle_tmr(
2886         struct se_cmd *cmd)
2887 {
2888         unsigned long flags;
2889
2890         spin_lock_irqsave(&cmd->t_state_lock, flags);
2891         cmd->transport_state |= CMD_T_ACTIVE;
2892         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2893
2894         INIT_WORK(&cmd->work, target_tmr_work);
2895         queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2896         return 0;
2897 }
2898 EXPORT_SYMBOL(transport_generic_handle_tmr);