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_transport.h>
  45 #include <target/target_core_fabric_ops.h>
  46 #include <target/target_core_fabric_configfs.h>
  47 #include <target/target_core_fabric_lib.h>
  48 #include <target/target_core_device.h>
  49 #include <target/target_core_tpg.h>
  50 #include <target/target_core_configfs.h>
  51 #include <target/configfs_macros.h>
  52
  53 #include "tcm_fc.h"
  54
  55 struct target_fabric_configfs *ft_configfs;
  56
  57 LIST_HEAD(ft_lport_list);
  58 DEFINE_MUTEX(ft_lport_lock);
  59
  60 unsigned int ft_debug_logging;
  61 module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
  62 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
  63
  64 /*
  65  * Parse WWN.
  66  * If strict, we require lower-case hex and colon separators to be sure
  67  * the name is the same as what would be generated by ft_format_wwn()
  68  * so the name and wwn are mapped one-to-one.
  69  */
  70 static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
  71 {
  72         const char *cp;
  73         char c;
  74         u32 byte = 0;
  75         u32 pos = 0;
  76         u32 err;
  77         int val;
  78
  79         *wwn = 0;
  80         for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
  81                 c = *cp;
  82                 if (c == '\n' && cp[1] == '\0')
  83                         continue;
  84                 if (strict && pos++ == 2 && byte++ < 7) {
  85                         pos = 0;
  86                         if (c == ':')
  87                                 continue;
  88                         err = 1;
  89                         goto fail;
  90                 }
  91                 if (c == '\0') {
  92                         err = 2;
  93                         if (strict && byte != 8)
  94                                 goto fail;
  95                         return cp - name;
  96                 }
  97                 err = 3;
  98                 val = hex_to_bin(c);
  99                 if (val < 0 || (strict && isupper(c)))
 100                         goto fail;
 101                 *wwn = (*wwn << 4) | val;
 102         }
 103         err = 4;
 104 fail:
 105         pr_debug("err %u len %zu pos %u byte %u\n",
 106                     err, cp - name, pos, byte);
 107         return -1;
 108 }
 109
 110 ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
 111 {
 112         u8 b[8];
 113
 114         put_unaligned_be64(wwn, b);
 115         return snprintf(buf, len,
 116                  "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
 117                  b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
 118 }
 119
 120 static ssize_t ft_wwn_show(void *arg, char *buf)
 121 {
 122         u64 *wwn = arg;
 123         ssize_t len;
 124
 125         len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
 126         buf[len++] = '\n';
 127         return len;
 128 }
 129
 130 static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
 131 {
 132         ssize_t ret;
 133         u64 wwn;
 134
 135         ret = ft_parse_wwn(buf, &wwn, 0);
 136         if (ret > 0)
 137                 *(u64 *)arg = wwn;
 138         return ret;
 139 }
 140
 141 /*
 142  * ACL auth ops.
 143  */
 144
 145 static ssize_t ft_nacl_show_port_name(
 146         struct se_node_acl *se_nacl,
 147         char *page)
 148 {
 149         struct ft_node_acl *acl = container_of(se_nacl,
 150                         struct ft_node_acl, se_node_acl);
 151
 152         return ft_wwn_show(&acl->node_auth.port_name, page);
 153 }
 154
 155 static ssize_t ft_nacl_store_port_name(
 156         struct se_node_acl *se_nacl,
 157         const char *page,
 158         size_t count)
 159 {
 160         struct ft_node_acl *acl = container_of(se_nacl,
 161                         struct ft_node_acl, se_node_acl);
 162
 163         return ft_wwn_store(&acl->node_auth.port_name, page, count);
 164 }
 165
 166 TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR);
 167
 168 static ssize_t ft_nacl_show_node_name(
 169         struct se_node_acl *se_nacl,
 170         char *page)
 171 {
 172         struct ft_node_acl *acl = container_of(se_nacl,
 173                         struct ft_node_acl, se_node_acl);
 174
 175         return ft_wwn_show(&acl->node_auth.node_name, page);
 176 }
 177
 178 static ssize_t ft_nacl_store_node_name(
 179         struct se_node_acl *se_nacl,
 180         const char *page,
 181         size_t count)
 182 {
 183         struct ft_node_acl *acl = container_of(se_nacl,
 184                         struct ft_node_acl, se_node_acl);
 185
 186         return ft_wwn_store(&acl->node_auth.node_name, page, count);
 187 }
 188
 189 TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR);
 190
 191 static struct configfs_attribute *ft_nacl_base_attrs[] = {
 192         &ft_nacl_port_name.attr,
 193         &ft_nacl_node_name.attr,
 194         NULL,
 195 };
 196
 197 /*
 198  * ACL ops.
 199  */
 200
 201 /*
 202  * Add ACL for an initiator.  The ACL is named arbitrarily.
 203  * The port_name and/or node_name are attributes.
 204  */
 205 static struct se_node_acl *ft_add_acl(
 206         struct se_portal_group *se_tpg,
 207         struct config_group *group,
 208         const char *name)
 209 {
 210         struct ft_node_acl *acl;
 211         struct ft_tpg *tpg;
 212         u64 wwpn;
 213         u32 q_depth;
 214
 215         pr_debug("add acl %s\n", name);
 216         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 217
 218         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 219                 return ERR_PTR(-EINVAL);
 220
 221         acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL);
 222         if (!acl)
 223                 return ERR_PTR(-ENOMEM);
 224         acl->node_auth.port_name = wwpn;
 225
 226         q_depth = 32;           /* XXX bogus default - get from tpg? */
 227         return core_tpg_add_initiator_node_acl(&tpg->se_tpg,
 228                                 &acl->se_node_acl, name, q_depth);
 229 }
 230
 231 static void ft_del_acl(struct se_node_acl *se_acl)
 232 {
 233         struct se_portal_group *se_tpg = se_acl->se_tpg;
 234         struct ft_tpg *tpg;
 235         struct ft_node_acl *acl = container_of(se_acl,
 236                                 struct ft_node_acl, se_node_acl);
 237
 238         pr_debug("del acl %s\n",
 239                 config_item_name(&se_acl->acl_group.cg_item));
 240
 241         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 242         pr_debug("del acl %p se_acl %p tpg %p se_tpg %p\n",
 243                     acl, se_acl, tpg, &tpg->se_tpg);
 244
 245         core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1);
 246         kfree(acl);
 247 }
 248
 249 struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata)
 250 {
 251         struct ft_node_acl *found = NULL;
 252         struct ft_node_acl *acl;
 253         struct se_portal_group *se_tpg = &tpg->se_tpg;
 254         struct se_node_acl *se_acl;
 255
 256         spin_lock_irq(&se_tpg->acl_node_lock);
 257         list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) {
 258                 acl = container_of(se_acl, struct ft_node_acl, se_node_acl);
 259                 pr_debug("acl %p port_name %llx\n",
 260                         acl, (unsigned long long)acl->node_auth.port_name);
 261                 if (acl->node_auth.port_name == rdata->ids.port_name ||
 262                     acl->node_auth.node_name == rdata->ids.node_name) {
 263                         pr_debug("acl %p port_name %llx matched\n", acl,
 264                                     (unsigned long long)rdata->ids.port_name);
 265                         found = acl;
 266                         /* XXX need to hold onto ACL */
 267                         break;
 268                 }
 269         }
 270         spin_unlock_irq(&se_tpg->acl_node_lock);
 271         return found;
 272 }
 273
 274 struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg)
 275 {
 276         struct ft_node_acl *acl;
 277
 278         acl = kzalloc(sizeof(*acl), GFP_KERNEL);
 279         if (!acl) {
 280                 pr_err("Unable to allocate struct ft_node_acl\n");
 281                 return NULL;
 282         }
 283         pr_debug("acl %p\n", acl);
 284         return &acl->se_node_acl;
 285 }
 286
 287 static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg,
 288                                       struct se_node_acl *se_acl)
 289 {
 290         struct ft_node_acl *acl = container_of(se_acl,
 291                                 struct ft_node_acl, se_node_acl);
 292
 293         pr_debug("acl %p\n", acl);
 294         kfree(acl);
 295 }
 296
 297 /*
 298  * local_port port_group (tpg) ops.
 299  */
 300 static struct se_portal_group *ft_add_tpg(
 301         struct se_wwn *wwn,
 302         struct config_group *group,
 303         const char *name)
 304 {
 305         struct ft_lport_acl *lacl;
 306         struct ft_tpg *tpg;
 307         unsigned long index;
 308         int ret;
 309
 310         pr_debug("tcm_fc: add tpg %s\n", name);
 311
 312         /*
 313          * Name must be "tpgt_" followed by the index.
 314          */
 315         if (strstr(name, "tpgt_") != name)
 316                 return NULL;
 317         if (strict_strtoul(name + 5, 10, &index) || index > UINT_MAX)
 318                 return NULL;
 319
 320         lacl = container_of(wwn, struct ft_lport_acl, fc_lport_wwn);
 321         tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
 322         if (!tpg)
 323                 return NULL;
 324         tpg->index = index;
 325         tpg->lport_acl = lacl;
 326         INIT_LIST_HEAD(&tpg->lun_list);
 327
 328         ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg,
 329                                 tpg, TRANSPORT_TPG_TYPE_NORMAL);
 330         if (ret < 0) {
 331                 kfree(tpg);
 332                 return NULL;
 333         }
 334
 335         tpg->workqueue = alloc_workqueue("tcm_fc", 0, 1);
 336         if (!tpg->workqueue) {
 337                 kfree(tpg);
 338                 return NULL;
 339         }
 340
 341         mutex_lock(&ft_lport_lock);
 342         list_add_tail(&tpg->list, &lacl->tpg_list);
 343         mutex_unlock(&ft_lport_lock);
 344
 345         return &tpg->se_tpg;
 346 }
 347
 348 static void ft_del_tpg(struct se_portal_group *se_tpg)
 349 {
 350         struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 351
 352         pr_debug("del tpg %s\n",
 353                     config_item_name(&tpg->se_tpg.tpg_group.cg_item));
 354
 355         destroy_workqueue(tpg->workqueue);
 356
 357         /* Wait for sessions to be freed thru RCU, for BUG_ON below */
 358         synchronize_rcu();
 359
 360         mutex_lock(&ft_lport_lock);
 361         list_del(&tpg->list);
 362         if (tpg->tport) {
 363                 tpg->tport->tpg = NULL;
 364                 tpg->tport = NULL;
 365         }
 366         mutex_unlock(&ft_lport_lock);
 367
 368         core_tpg_deregister(se_tpg);
 369         kfree(tpg);
 370 }
 371
 372 /*
 373  * Verify that an lport is configured to use the tcm_fc module, and return
 374  * the target port group that should be used.
 375  *
 376  * The caller holds ft_lport_lock.
 377  */
 378 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
 379 {
 380         struct ft_lport_acl *lacl;
 381         struct ft_tpg *tpg;
 382
 383         list_for_each_entry(lacl, &ft_lport_list, list) {
 384                 if (lacl->wwpn == lport->wwpn) {
 385                         list_for_each_entry(tpg, &lacl->tpg_list, list)
 386                                 return tpg; /* XXX for now return first entry */
 387                         return NULL;
 388                 }
 389         }
 390         return NULL;
 391 }
 392
 393 /*
 394  * target config instance ops.
 395  */
 396
 397 /*
 398  * Add lport to allowed config.
 399  * The name is the WWPN in lower-case ASCII, colon-separated bytes.
 400  */
 401 static struct se_wwn *ft_add_lport(
 402         struct target_fabric_configfs *tf,
 403         struct config_group *group,
 404         const char *name)
 405 {
 406         struct ft_lport_acl *lacl;
 407         struct ft_lport_acl *old_lacl;
 408         u64 wwpn;
 409
 410         pr_debug("add lport %s\n", name);
 411         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 412                 return NULL;
 413         lacl = kzalloc(sizeof(*lacl), GFP_KERNEL);
 414         if (!lacl)
 415                 return NULL;
 416         lacl->wwpn = wwpn;
 417         INIT_LIST_HEAD(&lacl->tpg_list);
 418
 419         mutex_lock(&ft_lport_lock);
 420         list_for_each_entry(old_lacl, &ft_lport_list, list) {
 421                 if (old_lacl->wwpn == wwpn) {
 422                         mutex_unlock(&ft_lport_lock);
 423                         kfree(lacl);
 424                         return NULL;
 425                 }
 426         }
 427         list_add_tail(&lacl->list, &ft_lport_list);
 428         ft_format_wwn(lacl->name, sizeof(lacl->name), wwpn);
 429         mutex_unlock(&ft_lport_lock);
 430
 431         return &lacl->fc_lport_wwn;
 432 }
 433
 434 static void ft_del_lport(struct se_wwn *wwn)
 435 {
 436         struct ft_lport_acl *lacl = container_of(wwn,
 437                                 struct ft_lport_acl, fc_lport_wwn);
 438
 439         pr_debug("del lport %s\n", lacl->name);
 440         mutex_lock(&ft_lport_lock);
 441         list_del(&lacl->list);
 442         mutex_unlock(&ft_lport_lock);
 443
 444         kfree(lacl);
 445 }
 446
 447 static ssize_t ft_wwn_show_attr_version(
 448         struct target_fabric_configfs *tf,
 449         char *page)
 450 {
 451         return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
 452                 ""UTS_RELEASE"\n",  utsname()->sysname, utsname()->machine);
 453 }
 454
 455 TF_WWN_ATTR_RO(ft, version);
 456
 457 static struct configfs_attribute *ft_wwn_attrs[] = {
 458         &ft_wwn_version.attr,
 459         NULL,
 460 };
 461
 462 static char *ft_get_fabric_name(void)
 463 {
 464         return "fc";
 465 }
 466
 467 static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
 468 {
 469         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 470
 471         return tpg->lport_acl->name;
 472 }
 473
 474 static u16 ft_get_tag(struct se_portal_group *se_tpg)
 475 {
 476         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 477
 478         /*
 479          * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
 480          * to represent the SCSI Target Port.
 481          */
 482         return tpg->index;
 483 }
 484
 485 static u32 ft_get_default_depth(struct se_portal_group *se_tpg)
 486 {
 487         return 1;
 488 }
 489
 490 static int ft_check_false(struct se_portal_group *se_tpg)
 491 {
 492         return 0;
 493 }
 494
 495 static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
 496 {
 497 }
 498
 499 static u16 ft_get_fabric_sense_len(void)
 500 {
 501         return 0;
 502 }
 503
 504 static u16 ft_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_len)
 505 {
 506         return 0;
 507 }
 508
 509 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
 510 {
 511         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 512
 513         return tpg->index;
 514 }
 515
 516 static struct target_core_fabric_ops ft_fabric_ops = {
 517         .get_fabric_name =              ft_get_fabric_name,
 518         .get_fabric_proto_ident =       fc_get_fabric_proto_ident,
 519         .tpg_get_wwn =                  ft_get_fabric_wwn,
 520         .tpg_get_tag =                  ft_get_tag,
 521         .tpg_get_default_depth =        ft_get_default_depth,
 522         .tpg_get_pr_transport_id =      fc_get_pr_transport_id,
 523         .tpg_get_pr_transport_id_len =  fc_get_pr_transport_id_len,
 524         .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id,
 525         .tpg_check_demo_mode =          ft_check_false,
 526         .tpg_check_demo_mode_cache =    ft_check_false,
 527         .tpg_check_demo_mode_write_protect = ft_check_false,
 528         .tpg_check_prod_mode_write_protect = ft_check_false,
 529         .tpg_alloc_fabric_acl =         ft_tpg_alloc_fabric_acl,
 530         .tpg_release_fabric_acl =       ft_tpg_release_fabric_acl,
 531         .tpg_get_inst_index =           ft_tpg_get_inst_index,
 532         .check_stop_free =              ft_check_stop_free,
 533         .release_cmd =                  ft_release_cmd,
 534         .shutdown_session =             ft_sess_shutdown,
 535         .close_session =                ft_sess_close,
 536         .stop_session =                 ft_sess_stop,
 537         .fall_back_to_erl0 =            ft_sess_set_erl0,
 538         .sess_logged_in =               ft_sess_logged_in,
 539         .sess_get_index =               ft_sess_get_index,
 540         .sess_get_initiator_sid =       NULL,
 541         .write_pending =                ft_write_pending,
 542         .write_pending_status =         ft_write_pending_status,
 543         .set_default_node_attributes =  ft_set_default_node_attr,
 544         .get_task_tag =                 ft_get_task_tag,
 545         .get_cmd_state =                ft_get_cmd_state,
 546         .queue_data_in =                ft_queue_data_in,
 547         .queue_status =                 ft_queue_status,
 548         .queue_tm_rsp =                 ft_queue_tm_resp,
 549         .get_fabric_sense_len =         ft_get_fabric_sense_len,
 550         .set_fabric_sense_len =         ft_set_fabric_sense_len,
 551         .is_state_remove =              ft_is_state_remove,
 552         /*
 553          * Setup function pointers for generic logic in
 554          * target_core_fabric_configfs.c
 555          */
 556         .fabric_make_wwn =              &ft_add_lport,
 557         .fabric_drop_wwn =              &ft_del_lport,
 558         .fabric_make_tpg =              &ft_add_tpg,
 559         .fabric_drop_tpg =              &ft_del_tpg,
 560         .fabric_post_link =             NULL,
 561         .fabric_pre_unlink =            NULL,
 562         .fabric_make_np =               NULL,
 563         .fabric_drop_np =               NULL,
 564         .fabric_make_nodeacl =          &ft_add_acl,
 565         .fabric_drop_nodeacl =          &ft_del_acl,
 566 };
 567
 568 int ft_register_configfs(void)
 569 {
 570         struct target_fabric_configfs *fabric;
 571         int ret;
 572
 573         /*
 574          * Register the top level struct config_item_type with TCM core
 575          */
 576         fabric = target_fabric_configfs_init(THIS_MODULE, "fc");
 577         if (IS_ERR(fabric)) {
 578                 pr_err("%s: target_fabric_configfs_init() failed!\n",
 579                        __func__);
 580                 return PTR_ERR(fabric);
 581         }
 582         fabric->tf_ops = ft_fabric_ops;
 583
 584         /* Allowing support for task_sg_chaining */
 585         fabric->tf_ops.task_sg_chaining = 1;
 586
 587         /*
 588          * Setup default attribute lists for various fabric->tf_cit_tmpl
 589          */
 590         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = ft_wwn_attrs;
 591         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = NULL;
 592         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
 593         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
 594         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
 595         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs =
 596                                                     ft_nacl_base_attrs;
 597         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
 598         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
 599         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
 600         /*
 601          * register the fabric for use within TCM
 602          */
 603         ret = target_fabric_configfs_register(fabric);
 604         if (ret < 0) {
 605                 pr_debug("target_fabric_configfs_register() for"
 606                             " FC Target failed!\n");
 607                 target_fabric_configfs_free(fabric);
 608                 return -1;
 609         }
 610
 611         /*
 612          * Setup our local pointer to *fabric.
 613          */
 614         ft_configfs = fabric;
 615         return 0;
 616 }
 617
 618 void ft_deregister_configfs(void)
 619 {
 620         if (!ft_configfs)
 621                 return;
 622         target_fabric_configfs_deregister(ft_configfs);
 623         ft_configfs = NULL;
 624 }
 625
 626 static struct notifier_block ft_notifier = {
 627         .notifier_call = ft_lport_notify
 628 };
 629
 630 static int __init ft_init(void)
 631 {
 632         if (ft_register_configfs())
 633                 return -1;
 634         if (fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov)) {
 635                 ft_deregister_configfs();
 636                 return -1;
 637         }
 638         blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
 639         fc_lport_iterate(ft_lport_add, NULL);
 640         return 0;
 641 }
 642
 643 static void __exit ft_exit(void)
 644 {
 645         blocking_notifier_chain_unregister(&fc_lport_notifier_head,
 646                                            &ft_notifier);
 647         fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
 648         fc_lport_iterate(ft_lport_del, NULL);
 649         ft_deregister_configfs();
 650         synchronize_rcu();
 651 }
 652
 653 MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
 654 MODULE_LICENSE("GPL");
 655 module_init(ft_init);
 656 module_exit(ft_exit);