drivers/target/tcm_fc/tfc_conf.c

   1 /*******************************************************************************
   2  * Filename:  tcm_fc.c
   3  *
   4  * This file contains the configfs implementation for TCM_fc fabric node.
   5  * Based on tcm_loop_configfs.c
   6  *
   7  * Copyright (c) 2010 Cisco Systems, Inc.
   8  * Copyright (c) 2009,2010 Rising Tide, Inc.
   9  * Copyright (c) 2009,2010 Linux-iSCSI.org
  10  *
  11  * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  ****************************************************************************/
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <generated/utsrelease.h>
  27 #include <linux/utsname.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/kthread.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/configfs.h>
  34 #include <linux/kernel.h>
  35 #include <linux/ctype.h>
  36 #include <asm/unaligned.h>
  37 #include <scsi/scsi.h>
  38 #include <scsi/scsi_host.h>
  39 #include <scsi/scsi_device.h>
  40 #include <scsi/scsi_cmnd.h>
  41 #include <scsi/libfc.h>
  42
  43 #include <target/target_core_base.h>
  44 #include <target/target_core_fabric.h>
  45 #include <target/target_core_fabric_configfs.h>
  46 #include <target/target_core_configfs.h>
  47 #include <target/configfs_macros.h>
  48
  49 #include "tcm_fc.h"
  50
  51 struct target_fabric_configfs *ft_configfs;
  52
  53 LIST_HEAD(ft_lport_list);
  54 DEFINE_MUTEX(ft_lport_lock);
  55
  56 unsigned int ft_debug_logging;
  57 module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
  58 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
  59
  60 /*
  61  * Parse WWN.
  62  * If strict, we require lower-case hex and colon separators to be sure
  63  * the name is the same as what would be generated by ft_format_wwn()
  64  * so the name and wwn are mapped one-to-one.
  65  */
  66 static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
  67 {
  68         const char *cp;
  69         char c;
  70         u32 byte = 0;
  71         u32 pos = 0;
  72         u32 err;
  73         int val;
  74
  75         *wwn = 0;
  76         for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
  77                 c = *cp;
  78                 if (c == '\n' && cp[1] == '\0')
  79                         continue;
  80                 if (strict && pos++ == 2 && byte++ < 7) {
  81                         pos = 0;
  82                         if (c == ':')
  83                                 continue;
  84                         err = 1;
  85                         goto fail;
  86                 }
  87                 if (c == '\0') {
  88                         err = 2;
  89                         if (strict && byte != 8)
  90                                 goto fail;
  91                         return cp - name;
  92                 }
  93                 err = 3;
  94                 val = hex_to_bin(c);
  95                 if (val < 0 || (strict && isupper(c)))
  96                         goto fail;
  97                 *wwn = (*wwn << 4) | val;
  98         }
  99         err = 4;
 100 fail:
 101         pr_debug("err %u len %zu pos %u byte %u\n",
 102                     err, cp - name, pos, byte);
 103         return -1;
 104 }
 105
 106 ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
 107 {
 108         u8 b[8];
 109
 110         put_unaligned_be64(wwn, b);
 111         return snprintf(buf, len,
 112                  "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
 113                  b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
 114 }
 115
 116 static ssize_t ft_wwn_show(void *arg, char *buf)
 117 {
 118         u64 *wwn = arg;
 119         ssize_t len;
 120
 121         len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
 122         buf[len++] = '\n';
 123         return len;
 124 }
 125
 126 static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
 127 {
 128         ssize_t ret;
 129         u64 wwn;
 130
 131         ret = ft_parse_wwn(buf, &wwn, 0);
 132         if (ret > 0)
 133                 *(u64 *)arg = wwn;
 134         return ret;
 135 }
 136
 137 /*
 138  * ACL auth ops.
 139  */
 140
 141 static ssize_t ft_nacl_show_port_name(
 142         struct se_node_acl *se_nacl,
 143         char *page)
 144 {
 145         struct ft_node_acl *acl = container_of(se_nacl,
 146                         struct ft_node_acl, se_node_acl);
 147
 148         return ft_wwn_show(&acl->node_auth.port_name, page);
 149 }
 150
 151 static ssize_t ft_nacl_store_port_name(
 152         struct se_node_acl *se_nacl,
 153         const char *page,
 154         size_t count)
 155 {
 156         struct ft_node_acl *acl = container_of(se_nacl,
 157                         struct ft_node_acl, se_node_acl);
 158
 159         return ft_wwn_store(&acl->node_auth.port_name, page, count);
 160 }
 161
 162 TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR);
 163
 164 static ssize_t ft_nacl_show_node_name(
 165         struct se_node_acl *se_nacl,
 166         char *page)
 167 {
 168         struct ft_node_acl *acl = container_of(se_nacl,
 169                         struct ft_node_acl, se_node_acl);
 170
 171         return ft_wwn_show(&acl->node_auth.node_name, page);
 172 }
 173
 174 static ssize_t ft_nacl_store_node_name(
 175         struct se_node_acl *se_nacl,
 176         const char *page,
 177         size_t count)
 178 {
 179         struct ft_node_acl *acl = container_of(se_nacl,
 180                         struct ft_node_acl, se_node_acl);
 181
 182         return ft_wwn_store(&acl->node_auth.node_name, page, count);
 183 }
 184
 185 TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR);
 186
 187 static struct configfs_attribute *ft_nacl_base_attrs[] = {
 188         &ft_nacl_port_name.attr,
 189         &ft_nacl_node_name.attr,
 190         NULL,
 191 };
 192
 193 /*
 194  * ACL ops.
 195  */
 196
 197 /*
 198  * Add ACL for an initiator.  The ACL is named arbitrarily.
 199  * The port_name and/or node_name are attributes.
 200  */
 201 static struct se_node_acl *ft_add_acl(
 202         struct se_portal_group *se_tpg,
 203         struct config_group *group,
 204         const char *name)
 205 {
 206         struct ft_node_acl *acl;
 207         struct ft_tpg *tpg;
 208         u64 wwpn;
 209         u32 q_depth;
 210
 211         pr_debug("add acl %s\n", name);
 212         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 213
 214         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 215                 return ERR_PTR(-EINVAL);
 216
 217         acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL);
 218         if (!acl)
 219                 return ERR_PTR(-ENOMEM);
 220         acl->node_auth.port_name = wwpn;
 221
 222         q_depth = 32;           /* XXX bogus default - get from tpg? */
 223         return core_tpg_add_initiator_node_acl(&tpg->se_tpg,
 224                                 &acl->se_node_acl, name, q_depth);
 225 }
 226
 227 static void ft_del_acl(struct se_node_acl *se_acl)
 228 {
 229         struct se_portal_group *se_tpg = se_acl->se_tpg;
 230         struct ft_tpg *tpg;
 231         struct ft_node_acl *acl = container_of(se_acl,
 232                                 struct ft_node_acl, se_node_acl);
 233
 234         pr_debug("del acl %s\n",
 235                 config_item_name(&se_acl->acl_group.cg_item));
 236
 237         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 238         pr_debug("del acl %p se_acl %p tpg %p se_tpg %p\n",
 239                     acl, se_acl, tpg, &tpg->se_tpg);
 240
 241         core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1);
 242         kfree(acl);
 243 }
 244
 245 struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata)
 246 {
 247         struct ft_node_acl *found = NULL;
 248         struct ft_node_acl *acl;
 249         struct se_portal_group *se_tpg = &tpg->se_tpg;
 250         struct se_node_acl *se_acl;
 251
 252         spin_lock_irq(&se_tpg->acl_node_lock);
 253         list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) {
 254                 acl = container_of(se_acl, struct ft_node_acl, se_node_acl);
 255                 pr_debug("acl %p port_name %llx\n",
 256                         acl, (unsigned long long)acl->node_auth.port_name);
 257                 if (acl->node_auth.port_name == rdata->ids.port_name ||
 258                     acl->node_auth.node_name == rdata->ids.node_name) {
 259                         pr_debug("acl %p port_name %llx matched\n", acl,
 260                                     (unsigned long long)rdata->ids.port_name);
 261                         found = acl;
 262                         /* XXX need to hold onto ACL */
 263                         break;
 264                 }
 265         }
 266         spin_unlock_irq(&se_tpg->acl_node_lock);
 267         return found;
 268 }
 269
 270 struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg)
 271 {
 272         struct ft_node_acl *acl;
 273
 274         acl = kzalloc(sizeof(*acl), GFP_KERNEL);
 275         if (!acl) {
 276                 pr_err("Unable to allocate struct ft_node_acl\n");
 277                 return NULL;
 278         }
 279         pr_debug("acl %p\n", acl);
 280         return &acl->se_node_acl;
 281 }
 282
 283 static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg,
 284                                       struct se_node_acl *se_acl)
 285 {
 286         struct ft_node_acl *acl = container_of(se_acl,
 287                                 struct ft_node_acl, se_node_acl);
 288
 289         pr_debug("acl %p\n", acl);
 290         kfree(acl);
 291 }
 292
 293 /*
 294  * local_port port_group (tpg) ops.
 295  */
 296 static struct se_portal_group *ft_add_tpg(
 297         struct se_wwn *wwn,
 298         struct config_group *group,
 299         const char *name)
 300 {
 301         struct ft_lport_acl *lacl;
 302         struct ft_tpg *tpg;
 303         unsigned long index;
 304         int ret;
 305
 306         pr_debug("tcm_fc: add tpg %s\n", name);
 307
 308         /*
 309          * Name must be "tpgt_" followed by the index.
 310          */
 311         if (strstr(name, "tpgt_") != name)
 312                 return NULL;
 313         if (strict_strtoul(name + 5, 10, &index) || index > UINT_MAX)
 314                 return NULL;
 315
 316         lacl = container_of(wwn, struct ft_lport_acl, fc_lport_wwn);
 317         tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
 318         if (!tpg)
 319                 return NULL;
 320         tpg->index = index;
 321         tpg->lport_acl = lacl;
 322         INIT_LIST_HEAD(&tpg->lun_list);
 323
 324         ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg,
 325                                 tpg, TRANSPORT_TPG_TYPE_NORMAL);
 326         if (ret < 0) {
 327                 kfree(tpg);
 328                 return NULL;
 329         }
 330
 331         tpg->workqueue = alloc_workqueue("tcm_fc", 0, 1);
 332         if (!tpg->workqueue) {
 333                 kfree(tpg);
 334                 return NULL;
 335         }
 336
 337         mutex_lock(&ft_lport_lock);
 338         list_add_tail(&tpg->list, &lacl->tpg_list);
 339         mutex_unlock(&ft_lport_lock);
 340
 341         return &tpg->se_tpg;
 342 }
 343
 344 static void ft_del_tpg(struct se_portal_group *se_tpg)
 345 {
 346         struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 347
 348         pr_debug("del tpg %s\n",
 349                     config_item_name(&tpg->se_tpg.tpg_group.cg_item));
 350
 351         destroy_workqueue(tpg->workqueue);
 352
 353         /* Wait for sessions to be freed thru RCU, for BUG_ON below */
 354         synchronize_rcu();
 355
 356         mutex_lock(&ft_lport_lock);
 357         list_del(&tpg->list);
 358         if (tpg->tport) {
 359                 tpg->tport->tpg = NULL;
 360                 tpg->tport = NULL;
 361         }
 362         mutex_unlock(&ft_lport_lock);
 363
 364         core_tpg_deregister(se_tpg);
 365         kfree(tpg);
 366 }
 367
 368 /*
 369  * Verify that an lport is configured to use the tcm_fc module, and return
 370  * the target port group that should be used.
 371  *
 372  * The caller holds ft_lport_lock.
 373  */
 374 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
 375 {
 376         struct ft_lport_acl *lacl;
 377         struct ft_tpg *tpg;
 378
 379         list_for_each_entry(lacl, &ft_lport_list, list) {
 380                 if (lacl->wwpn == lport->wwpn) {
 381                         list_for_each_entry(tpg, &lacl->tpg_list, list)
 382                                 return tpg; /* XXX for now return first entry */
 383                         return NULL;
 384                 }
 385         }
 386         return NULL;
 387 }
 388
 389 /*
 390  * target config instance ops.
 391  */
 392
 393 /*
 394  * Add lport to allowed config.
 395  * The name is the WWPN in lower-case ASCII, colon-separated bytes.
 396  */
 397 static struct se_wwn *ft_add_lport(
 398         struct target_fabric_configfs *tf,
 399         struct config_group *group,
 400         const char *name)
 401 {
 402         struct ft_lport_acl *lacl;
 403         struct ft_lport_acl *old_lacl;
 404         u64 wwpn;
 405
 406         pr_debug("add lport %s\n", name);
 407         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 408                 return NULL;
 409         lacl = kzalloc(sizeof(*lacl), GFP_KERNEL);
 410         if (!lacl)
 411                 return NULL;
 412         lacl->wwpn = wwpn;
 413         INIT_LIST_HEAD(&lacl->tpg_list);
 414
 415         mutex_lock(&ft_lport_lock);
 416         list_for_each_entry(old_lacl, &ft_lport_list, list) {
 417                 if (old_lacl->wwpn == wwpn) {
 418                         mutex_unlock(&ft_lport_lock);
 419                         kfree(lacl);
 420                         return NULL;
 421                 }
 422         }
 423         list_add_tail(&lacl->list, &ft_lport_list);
 424         ft_format_wwn(lacl->name, sizeof(lacl->name), wwpn);
 425         mutex_unlock(&ft_lport_lock);
 426
 427         return &lacl->fc_lport_wwn;
 428 }
 429
 430 static void ft_del_lport(struct se_wwn *wwn)
 431 {
 432         struct ft_lport_acl *lacl = container_of(wwn,
 433                                 struct ft_lport_acl, fc_lport_wwn);
 434
 435         pr_debug("del lport %s\n", lacl->name);
 436         mutex_lock(&ft_lport_lock);
 437         list_del(&lacl->list);
 438         mutex_unlock(&ft_lport_lock);
 439
 440         kfree(lacl);
 441 }
 442
 443 static ssize_t ft_wwn_show_attr_version(
 444         struct target_fabric_configfs *tf,
 445         char *page)
 446 {
 447         return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
 448                 ""UTS_RELEASE"\n",  utsname()->sysname, utsname()->machine);
 449 }
 450
 451 TF_WWN_ATTR_RO(ft, version);
 452
 453 static struct configfs_attribute *ft_wwn_attrs[] = {
 454         &ft_wwn_version.attr,
 455         NULL,
 456 };
 457
 458 static char *ft_get_fabric_name(void)
 459 {
 460         return "fc";
 461 }
 462
 463 static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
 464 {
 465         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 466
 467         return tpg->lport_acl->name;
 468 }
 469
 470 static u16 ft_get_tag(struct se_portal_group *se_tpg)
 471 {
 472         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 473
 474         /*
 475          * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
 476          * to represent the SCSI Target Port.
 477          */
 478         return tpg->index;
 479 }
 480
 481 static u32 ft_get_default_depth(struct se_portal_group *se_tpg)
 482 {
 483         return 1;
 484 }
 485
 486 static int ft_check_false(struct se_portal_group *se_tpg)
 487 {
 488         return 0;
 489 }
 490
 491 static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
 492 {
 493 }
 494
 495 static u16 ft_get_fabric_sense_len(void)
 496 {
 497         return 0;
 498 }
 499
 500 static u16 ft_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_len)
 501 {
 502         return 0;
 503 }
 504
 505 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
 506 {
 507         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 508
 509         return tpg->index;
 510 }
 511
 512 static struct target_core_fabric_ops ft_fabric_ops = {
 513         .get_fabric_name =              ft_get_fabric_name,
 514         .get_fabric_proto_ident =       fc_get_fabric_proto_ident,
 515         .tpg_get_wwn =                  ft_get_fabric_wwn,
 516         .tpg_get_tag =                  ft_get_tag,
 517         .tpg_get_default_depth =        ft_get_default_depth,
 518         .tpg_get_pr_transport_id =      fc_get_pr_transport_id,
 519         .tpg_get_pr_transport_id_len =  fc_get_pr_transport_id_len,
 520         .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id,
 521         .tpg_check_demo_mode =          ft_check_false,
 522         .tpg_check_demo_mode_cache =    ft_check_false,
 523         .tpg_check_demo_mode_write_protect = ft_check_false,
 524         .tpg_check_prod_mode_write_protect = ft_check_false,
 525         .tpg_alloc_fabric_acl =         ft_tpg_alloc_fabric_acl,
 526         .tpg_release_fabric_acl =       ft_tpg_release_fabric_acl,
 527         .tpg_get_inst_index =           ft_tpg_get_inst_index,
 528         .check_stop_free =              ft_check_stop_free,
 529         .release_cmd =                  ft_release_cmd,
 530         .shutdown_session =             ft_sess_shutdown,
 531         .close_session =                ft_sess_close,
 532         .sess_get_index =               ft_sess_get_index,
 533         .sess_get_initiator_sid =       NULL,
 534         .write_pending =                ft_write_pending,
 535         .write_pending_status =         ft_write_pending_status,
 536         .set_default_node_attributes =  ft_set_default_node_attr,
 537         .get_task_tag =                 ft_get_task_tag,
 538         .get_cmd_state =                ft_get_cmd_state,
 539         .queue_data_in =                ft_queue_data_in,
 540         .queue_status =                 ft_queue_status,
 541         .queue_tm_rsp =                 ft_queue_tm_resp,
 542         .get_fabric_sense_len =         ft_get_fabric_sense_len,
 543         .set_fabric_sense_len =         ft_set_fabric_sense_len,
 544         /*
 545          * Setup function pointers for generic logic in
 546          * target_core_fabric_configfs.c
 547          */
 548         .fabric_make_wwn =              &ft_add_lport,
 549         .fabric_drop_wwn =              &ft_del_lport,
 550         .fabric_make_tpg =              &ft_add_tpg,
 551         .fabric_drop_tpg =              &ft_del_tpg,
 552         .fabric_post_link =             NULL,
 553         .fabric_pre_unlink =            NULL,
 554         .fabric_make_np =               NULL,
 555         .fabric_drop_np =               NULL,
 556         .fabric_make_nodeacl =          &ft_add_acl,
 557         .fabric_drop_nodeacl =          &ft_del_acl,
 558 };
 559
 560 int ft_register_configfs(void)
 561 {
 562         struct target_fabric_configfs *fabric;
 563         int ret;
 564
 565         /*
 566          * Register the top level struct config_item_type with TCM core
 567          */
 568         fabric = target_fabric_configfs_init(THIS_MODULE, "fc");
 569         if (IS_ERR(fabric)) {
 570                 pr_err("%s: target_fabric_configfs_init() failed!\n",
 571                        __func__);
 572                 return PTR_ERR(fabric);
 573         }
 574         fabric->tf_ops = ft_fabric_ops;
 575
 576         /* Allowing support for task_sg_chaining */
 577         fabric->tf_ops.task_sg_chaining = 1;
 578
 579         /*
 580          * Setup default attribute lists for various fabric->tf_cit_tmpl
 581          */
 582         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = ft_wwn_attrs;
 583         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = NULL;
 584         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
 585         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
 586         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
 587         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs =
 588                                                     ft_nacl_base_attrs;
 589         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
 590         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
 591         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
 592         /*
 593          * register the fabric for use within TCM
 594          */
 595         ret = target_fabric_configfs_register(fabric);
 596         if (ret < 0) {
 597                 pr_debug("target_fabric_configfs_register() for"
 598                             " FC Target failed!\n");
 599                 target_fabric_configfs_free(fabric);
 600                 return -1;
 601         }
 602
 603         /*
 604          * Setup our local pointer to *fabric.
 605          */
 606         ft_configfs = fabric;
 607         return 0;
 608 }
 609
 610 void ft_deregister_configfs(void)
 611 {
 612         if (!ft_configfs)
 613                 return;
 614         target_fabric_configfs_deregister(ft_configfs);
 615         ft_configfs = NULL;
 616 }
 617
 618 static struct notifier_block ft_notifier = {
 619         .notifier_call = ft_lport_notify
 620 };
 621
 622 static int __init ft_init(void)
 623 {
 624         if (ft_register_configfs())
 625                 return -1;
 626         if (fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov)) {
 627                 ft_deregister_configfs();
 628                 return -1;
 629         }
 630         blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
 631         fc_lport_iterate(ft_lport_add, NULL);
 632         return 0;
 633 }
 634
 635 static void __exit ft_exit(void)
 636 {
 637         blocking_notifier_chain_unregister(&fc_lport_notifier_head,
 638                                            &ft_notifier);
 639         fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
 640         fc_lport_iterate(ft_lport_del, NULL);
 641         ft_deregister_configfs();
 642         synchronize_rcu();
 643 }
 644
 645 MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
 646 MODULE_LICENSE("GPL");
 647 module_init(ft_init);
 648 module_exit(ft_exit);