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 <linux/version.h>
  27 #include <generated/utsrelease.h>
  28 #include <linux/utsname.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/kthread.h>
  32 #include <linux/types.h>
  33 #include <linux/string.h>
  34 #include <linux/configfs.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 nibble;
  75         u32 byte = 0;
  76         u32 pos = 0;
  77         u32 err;
  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                 if (isdigit(c))
  99                         nibble = c - '0';
 100                 else if (isxdigit(c) && (islower(c) || !strict))
 101                         nibble = tolower(c) - 'a' + 10;
 102                 else
 103                         goto fail;
 104                 *wwn = (*wwn << 4) | nibble;
 105         }
 106         err = 4;
 107 fail:
 108         pr_debug("err %u len %zu pos %u byte %u\n",
 109                     err, cp - name, pos, byte);
 110         return -1;
 111 }
 112
 113 ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
 114 {
 115         u8 b[8];
 116
 117         put_unaligned_be64(wwn, b);
 118         return snprintf(buf, len,
 119                  "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
 120                  b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
 121 }
 122
 123 static ssize_t ft_wwn_show(void *arg, char *buf)
 124 {
 125         u64 *wwn = arg;
 126         ssize_t len;
 127
 128         len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
 129         buf[len++] = '\n';
 130         return len;
 131 }
 132
 133 static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
 134 {
 135         ssize_t ret;
 136         u64 wwn;
 137
 138         ret = ft_parse_wwn(buf, &wwn, 0);
 139         if (ret > 0)
 140                 *(u64 *)arg = wwn;
 141         return ret;
 142 }
 143
 144 /*
 145  * ACL auth ops.
 146  */
 147
 148 static ssize_t ft_nacl_show_port_name(
 149         struct se_node_acl *se_nacl,
 150         char *page)
 151 {
 152         struct ft_node_acl *acl = container_of(se_nacl,
 153                         struct ft_node_acl, se_node_acl);
 154
 155         return ft_wwn_show(&acl->node_auth.port_name, page);
 156 }
 157
 158 static ssize_t ft_nacl_store_port_name(
 159         struct se_node_acl *se_nacl,
 160         const char *page,
 161         size_t count)
 162 {
 163         struct ft_node_acl *acl = container_of(se_nacl,
 164                         struct ft_node_acl, se_node_acl);
 165
 166         return ft_wwn_store(&acl->node_auth.port_name, page, count);
 167 }
 168
 169 TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR);
 170
 171 static ssize_t ft_nacl_show_node_name(
 172         struct se_node_acl *se_nacl,
 173         char *page)
 174 {
 175         struct ft_node_acl *acl = container_of(se_nacl,
 176                         struct ft_node_acl, se_node_acl);
 177
 178         return ft_wwn_show(&acl->node_auth.node_name, page);
 179 }
 180
 181 static ssize_t ft_nacl_store_node_name(
 182         struct se_node_acl *se_nacl,
 183         const char *page,
 184         size_t count)
 185 {
 186         struct ft_node_acl *acl = container_of(se_nacl,
 187                         struct ft_node_acl, se_node_acl);
 188
 189         return ft_wwn_store(&acl->node_auth.node_name, page, count);
 190 }
 191
 192 TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR);
 193
 194 static struct configfs_attribute *ft_nacl_base_attrs[] = {
 195         &ft_nacl_port_name.attr,
 196         &ft_nacl_node_name.attr,
 197         NULL,
 198 };
 199
 200 /*
 201  * ACL ops.
 202  */
 203
 204 /*
 205  * Add ACL for an initiator.  The ACL is named arbitrarily.
 206  * The port_name and/or node_name are attributes.
 207  */
 208 static struct se_node_acl *ft_add_acl(
 209         struct se_portal_group *se_tpg,
 210         struct config_group *group,
 211         const char *name)
 212 {
 213         struct ft_node_acl *acl;
 214         struct ft_tpg *tpg;
 215         u64 wwpn;
 216         u32 q_depth;
 217
 218         pr_debug("add acl %s\n", name);
 219         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 220
 221         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 222                 return ERR_PTR(-EINVAL);
 223
 224         acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL);
 225         if (!acl)
 226                 return ERR_PTR(-ENOMEM);
 227         acl->node_auth.port_name = wwpn;
 228
 229         q_depth = 32;           /* XXX bogus default - get from tpg? */
 230         return core_tpg_add_initiator_node_acl(&tpg->se_tpg,
 231                                 &acl->se_node_acl, name, q_depth);
 232 }
 233
 234 static void ft_del_acl(struct se_node_acl *se_acl)
 235 {
 236         struct se_portal_group *se_tpg = se_acl->se_tpg;
 237         struct ft_tpg *tpg;
 238         struct ft_node_acl *acl = container_of(se_acl,
 239                                 struct ft_node_acl, se_node_acl);
 240
 241         pr_debug("del acl %s\n",
 242                 config_item_name(&se_acl->acl_group.cg_item));
 243
 244         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 245         pr_debug("del acl %p se_acl %p tpg %p se_tpg %p\n",
 246                     acl, se_acl, tpg, &tpg->se_tpg);
 247
 248         core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1);
 249         kfree(acl);
 250 }
 251
 252 struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata)
 253 {
 254         struct ft_node_acl *found = NULL;
 255         struct ft_node_acl *acl;
 256         struct se_portal_group *se_tpg = &tpg->se_tpg;
 257         struct se_node_acl *se_acl;
 258
 259         spin_lock_irq(&se_tpg->acl_node_lock);
 260         list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) {
 261                 acl = container_of(se_acl, struct ft_node_acl, se_node_acl);
 262                 pr_debug("acl %p port_name %llx\n",
 263                         acl, (unsigned long long)acl->node_auth.port_name);
 264                 if (acl->node_auth.port_name == rdata->ids.port_name ||
 265                     acl->node_auth.node_name == rdata->ids.node_name) {
 266                         pr_debug("acl %p port_name %llx matched\n", acl,
 267                                     (unsigned long long)rdata->ids.port_name);
 268                         found = acl;
 269                         /* XXX need to hold onto ACL */
 270                         break;
 271                 }
 272         }
 273         spin_unlock_irq(&se_tpg->acl_node_lock);
 274         return found;
 275 }
 276
 277 struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg)
 278 {
 279         struct ft_node_acl *acl;
 280
 281         acl = kzalloc(sizeof(*acl), GFP_KERNEL);
 282         if (!acl) {
 283                 pr_err("Unable to allocate struct ft_node_acl\n");
 284                 return NULL;
 285         }
 286         pr_debug("acl %p\n", acl);
 287         return &acl->se_node_acl;
 288 }
 289
 290 static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg,
 291                                       struct se_node_acl *se_acl)
 292 {
 293         struct ft_node_acl *acl = container_of(se_acl,
 294                                 struct ft_node_acl, se_node_acl);
 295
 296         pr_debug("acl %p\n", acl);
 297         kfree(acl);
 298 }
 299
 300 /*
 301  * local_port port_group (tpg) ops.
 302  */
 303 static struct se_portal_group *ft_add_tpg(
 304         struct se_wwn *wwn,
 305         struct config_group *group,
 306         const char *name)
 307 {
 308         struct ft_lport_acl *lacl;
 309         struct ft_tpg *tpg;
 310         unsigned long index;
 311         int ret;
 312
 313         pr_debug("tcm_fc: add tpg %s\n", name);
 314
 315         /*
 316          * Name must be "tpgt_" followed by the index.
 317          */
 318         if (strstr(name, "tpgt_") != name)
 319                 return NULL;
 320         if (strict_strtoul(name + 5, 10, &index) || index > UINT_MAX)
 321                 return NULL;
 322
 323         lacl = container_of(wwn, struct ft_lport_acl, fc_lport_wwn);
 324         tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
 325         if (!tpg)
 326                 return NULL;
 327         tpg->index = index;
 328         tpg->lport_acl = lacl;
 329         INIT_LIST_HEAD(&tpg->lun_list);
 330         transport_init_queue_obj(&tpg->qobj);
 331
 332         ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg,
 333                                 tpg, TRANSPORT_TPG_TYPE_NORMAL);
 334         if (ret < 0) {
 335                 kfree(tpg);
 336                 return NULL;
 337         }
 338
 339         tpg->thread = kthread_run(ft_thread, tpg, "ft_tpg%lu", index);
 340         if (IS_ERR(tpg->thread)) {
 341                 kfree(tpg);
 342                 return NULL;
 343         }
 344
 345         mutex_lock(&ft_lport_lock);
 346         list_add_tail(&tpg->list, &lacl->tpg_list);
 347         mutex_unlock(&ft_lport_lock);
 348
 349         return &tpg->se_tpg;
 350 }
 351
 352 static void ft_del_tpg(struct se_portal_group *se_tpg)
 353 {
 354         struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 355
 356         pr_debug("del tpg %s\n",
 357                     config_item_name(&tpg->se_tpg.tpg_group.cg_item));
 358
 359         kthread_stop(tpg->thread);
 360
 361         /* Wait for sessions to be freed thru RCU, for BUG_ON below */
 362         synchronize_rcu();
 363
 364         mutex_lock(&ft_lport_lock);
 365         list_del(&tpg->list);
 366         if (tpg->tport) {
 367                 tpg->tport->tpg = NULL;
 368                 tpg->tport = NULL;
 369         }
 370         mutex_unlock(&ft_lport_lock);
 371
 372         core_tpg_deregister(se_tpg);
 373         kfree(tpg);
 374 }
 375
 376 /*
 377  * Verify that an lport is configured to use the tcm_fc module, and return
 378  * the target port group that should be used.
 379  *
 380  * The caller holds ft_lport_lock.
 381  */
 382 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
 383 {
 384         struct ft_lport_acl *lacl;
 385         struct ft_tpg *tpg;
 386
 387         list_for_each_entry(lacl, &ft_lport_list, list) {
 388                 if (lacl->wwpn == lport->wwpn) {
 389                         list_for_each_entry(tpg, &lacl->tpg_list, list)
 390                                 return tpg; /* XXX for now return first entry */
 391                         return NULL;
 392                 }
 393         }
 394         return NULL;
 395 }
 396
 397 /*
 398  * target config instance ops.
 399  */
 400
 401 /*
 402  * Add lport to allowed config.
 403  * The name is the WWPN in lower-case ASCII, colon-separated bytes.
 404  */
 405 static struct se_wwn *ft_add_lport(
 406         struct target_fabric_configfs *tf,
 407         struct config_group *group,
 408         const char *name)
 409 {
 410         struct ft_lport_acl *lacl;
 411         struct ft_lport_acl *old_lacl;
 412         u64 wwpn;
 413
 414         pr_debug("add lport %s\n", name);
 415         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 416                 return NULL;
 417         lacl = kzalloc(sizeof(*lacl), GFP_KERNEL);
 418         if (!lacl)
 419                 return NULL;
 420         lacl->wwpn = wwpn;
 421         INIT_LIST_HEAD(&lacl->tpg_list);
 422
 423         mutex_lock(&ft_lport_lock);
 424         list_for_each_entry(old_lacl, &ft_lport_list, list) {
 425                 if (old_lacl->wwpn == wwpn) {
 426                         mutex_unlock(&ft_lport_lock);
 427                         kfree(lacl);
 428                         return NULL;
 429                 }
 430         }
 431         list_add_tail(&lacl->list, &ft_lport_list);
 432         ft_format_wwn(lacl->name, sizeof(lacl->name), wwpn);
 433         mutex_unlock(&ft_lport_lock);
 434
 435         return &lacl->fc_lport_wwn;
 436 }
 437
 438 static void ft_del_lport(struct se_wwn *wwn)
 439 {
 440         struct ft_lport_acl *lacl = container_of(wwn,
 441                                 struct ft_lport_acl, fc_lport_wwn);
 442
 443         pr_debug("del lport %s\n",
 444                         config_item_name(&wwn->wwn_group.cg_item));
 445         mutex_lock(&ft_lport_lock);
 446         list_del(&lacl->list);
 447         mutex_unlock(&ft_lport_lock);
 448
 449         kfree(lacl);
 450 }
 451
 452 static ssize_t ft_wwn_show_attr_version(
 453         struct target_fabric_configfs *tf,
 454         char *page)
 455 {
 456         return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
 457                 ""UTS_RELEASE"\n",  utsname()->sysname, utsname()->machine);
 458 }
 459
 460 TF_WWN_ATTR_RO(ft, version);
 461
 462 static struct configfs_attribute *ft_wwn_attrs[] = {
 463         &ft_wwn_version.attr,
 464         NULL,
 465 };
 466
 467 static char *ft_get_fabric_name(void)
 468 {
 469         return "fc";
 470 }
 471
 472 static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
 473 {
 474         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 475
 476         return tpg->lport_acl->name;
 477 }
 478
 479 static u16 ft_get_tag(struct se_portal_group *se_tpg)
 480 {
 481         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 482
 483         /*
 484          * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
 485          * to represent the SCSI Target Port.
 486          */
 487         return tpg->index;
 488 }
 489
 490 static u32 ft_get_default_depth(struct se_portal_group *se_tpg)
 491 {
 492         return 1;
 493 }
 494
 495 static int ft_check_false(struct se_portal_group *se_tpg)
 496 {
 497         return 0;
 498 }
 499
 500 static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
 501 {
 502 }
 503
 504 static u16 ft_get_fabric_sense_len(void)
 505 {
 506         return 0;
 507 }
 508
 509 static u16 ft_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_len)
 510 {
 511         return 0;
 512 }
 513
 514 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
 515 {
 516         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 517
 518         return tpg->index;
 519 }
 520
 521 static struct target_core_fabric_ops ft_fabric_ops = {
 522         .get_fabric_name =              ft_get_fabric_name,
 523         .get_fabric_proto_ident =       fc_get_fabric_proto_ident,
 524         .tpg_get_wwn =                  ft_get_fabric_wwn,
 525         .tpg_get_tag =                  ft_get_tag,
 526         .tpg_get_default_depth =        ft_get_default_depth,
 527         .tpg_get_pr_transport_id =      fc_get_pr_transport_id,
 528         .tpg_get_pr_transport_id_len =  fc_get_pr_transport_id_len,
 529         .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id,
 530         .tpg_check_demo_mode =          ft_check_false,
 531         .tpg_check_demo_mode_cache =    ft_check_false,
 532         .tpg_check_demo_mode_write_protect = ft_check_false,
 533         .tpg_check_prod_mode_write_protect = ft_check_false,
 534         .tpg_alloc_fabric_acl =         ft_tpg_alloc_fabric_acl,
 535         .tpg_release_fabric_acl =       ft_tpg_release_fabric_acl,
 536         .tpg_get_inst_index =           ft_tpg_get_inst_index,
 537         .check_stop_free =              ft_check_stop_free,
 538         .release_cmd =                  ft_release_cmd,
 539         .shutdown_session =             ft_sess_shutdown,
 540         .close_session =                ft_sess_close,
 541         .stop_session =                 ft_sess_stop,
 542         .fall_back_to_erl0 =            ft_sess_set_erl0,
 543         .sess_logged_in =               ft_sess_logged_in,
 544         .sess_get_index =               ft_sess_get_index,
 545         .sess_get_initiator_sid =       NULL,
 546         .write_pending =                ft_write_pending,
 547         .write_pending_status =         ft_write_pending_status,
 548         .set_default_node_attributes =  ft_set_default_node_attr,
 549         .get_task_tag =                 ft_get_task_tag,
 550         .get_cmd_state =                ft_get_cmd_state,
 551         .queue_data_in =                ft_queue_data_in,
 552         .queue_status =                 ft_queue_status,
 553         .queue_tm_rsp =                 ft_queue_tm_resp,
 554         .get_fabric_sense_len =         ft_get_fabric_sense_len,
 555         .set_fabric_sense_len =         ft_set_fabric_sense_len,
 556         .is_state_remove =              ft_is_state_remove,
 557         /*
 558          * Setup function pointers for generic logic in
 559          * target_core_fabric_configfs.c
 560          */
 561         .fabric_make_wwn =              &ft_add_lport,
 562         .fabric_drop_wwn =              &ft_del_lport,
 563         .fabric_make_tpg =              &ft_add_tpg,
 564         .fabric_drop_tpg =              &ft_del_tpg,
 565         .fabric_post_link =             NULL,
 566         .fabric_pre_unlink =            NULL,
 567         .fabric_make_np =               NULL,
 568         .fabric_drop_np =               NULL,
 569         .fabric_make_nodeacl =          &ft_add_acl,
 570         .fabric_drop_nodeacl =          &ft_del_acl,
 571 };
 572
 573 int ft_register_configfs(void)
 574 {
 575         struct target_fabric_configfs *fabric;
 576         int ret;
 577
 578         /*
 579          * Register the top level struct config_item_type with TCM core
 580          */
 581         fabric = target_fabric_configfs_init(THIS_MODULE, "fc");
 582         if (IS_ERR(fabric)) {
 583                 pr_err("%s: target_fabric_configfs_init() failed!\n",
 584                        __func__);
 585                 return PTR_ERR(fabric);
 586         }
 587         fabric->tf_ops = ft_fabric_ops;
 588
 589         /* Allowing support for task_sg_chaining */
 590         fabric->tf_ops.task_sg_chaining = 1;
 591
 592         /*
 593          * Setup default attribute lists for various fabric->tf_cit_tmpl
 594          */
 595         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = ft_wwn_attrs;
 596         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = NULL;
 597         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
 598         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
 599         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
 600         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs =
 601                                                     ft_nacl_base_attrs;
 602         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
 603         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
 604         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
 605         /*
 606          * register the fabric for use within TCM
 607          */
 608         ret = target_fabric_configfs_register(fabric);
 609         if (ret < 0) {
 610                 pr_debug("target_fabric_configfs_register() for"
 611                             " FC Target failed!\n");
 612                 target_fabric_configfs_free(fabric);
 613                 return -1;
 614         }
 615
 616         /*
 617          * Setup our local pointer to *fabric.
 618          */
 619         ft_configfs = fabric;
 620         return 0;
 621 }
 622
 623 void ft_deregister_configfs(void)
 624 {
 625         if (!ft_configfs)
 626                 return;
 627         target_fabric_configfs_deregister(ft_configfs);
 628         ft_configfs = NULL;
 629 }
 630
 631 static struct notifier_block ft_notifier = {
 632         .notifier_call = ft_lport_notify
 633 };
 634
 635 static int __init ft_init(void)
 636 {
 637         if (ft_register_configfs())
 638                 return -1;
 639         if (fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov)) {
 640                 ft_deregister_configfs();
 641                 return -1;
 642         }
 643         blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
 644         fc_lport_iterate(ft_lport_add, NULL);
 645         return 0;
 646 }
 647
 648 static void __exit ft_exit(void)
 649 {
 650         blocking_notifier_chain_unregister(&fc_lport_notifier_head,
 651                                            &ft_notifier);
 652         fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
 653         fc_lport_iterate(ft_lport_del, NULL);
 654         ft_deregister_configfs();
 655         synchronize_rcu();
 656 }
 657
 658 MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
 659 MODULE_LICENSE("GPL");
 660 module_init(ft_init);
 661 module_exit(ft_exit);