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/target_core_base.h>
  52 #include <target/configfs_macros.h>
  53
  54 #include "tcm_fc.h"
  55
  56 struct target_fabric_configfs *ft_configfs;
  57
  58 LIST_HEAD(ft_lport_list);
  59 DEFINE_MUTEX(ft_lport_lock);
  60
  61 unsigned int ft_debug_logging;
  62 module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
  63 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
  64
  65 /*
  66  * Parse WWN.
  67  * If strict, we require lower-case hex and colon separators to be sure
  68  * the name is the same as what would be generated by ft_format_wwn()
  69  * so the name and wwn are mapped one-to-one.
  70  */
  71 static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
  72 {
  73         const char *cp;
  74         char c;
  75         u32 nibble;
  76         u32 byte = 0;
  77         u32 pos = 0;
  78         u32 err;
  79
  80         *wwn = 0;
  81         for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
  82                 c = *cp;
  83                 if (c == '\n' && cp[1] == '\0')
  84                         continue;
  85                 if (strict && pos++ == 2 && byte++ < 7) {
  86                         pos = 0;
  87                         if (c == ':')
  88                                 continue;
  89                         err = 1;
  90                         goto fail;
  91                 }
  92                 if (c == '\0') {
  93                         err = 2;
  94                         if (strict && byte != 8)
  95                                 goto fail;
  96                         return cp - name;
  97                 }
  98                 err = 3;
  99                 if (isdigit(c))
 100                         nibble = c - '0';
 101                 else if (isxdigit(c) && (islower(c) || !strict))
 102                         nibble = tolower(c) - 'a' + 10;
 103                 else
 104                         goto fail;
 105                 *wwn = (*wwn << 4) | nibble;
 106         }
 107         err = 4;
 108 fail:
 109         FT_CONF_DBG("err %u len %zu pos %u byte %u\n",
 110                     err, cp - name, pos, byte);
 111         return -1;
 112 }
 113
 114 ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
 115 {
 116         u8 b[8];
 117
 118         put_unaligned_be64(wwn, b);
 119         return snprintf(buf, len,
 120                  "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
 121                  b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
 122 }
 123
 124 static ssize_t ft_wwn_show(void *arg, char *buf)
 125 {
 126         u64 *wwn = arg;
 127         ssize_t len;
 128
 129         len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
 130         buf[len++] = '\n';
 131         return len;
 132 }
 133
 134 static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
 135 {
 136         ssize_t ret;
 137         u64 wwn;
 138
 139         ret = ft_parse_wwn(buf, &wwn, 0);
 140         if (ret > 0)
 141                 *(u64 *)arg = wwn;
 142         return ret;
 143 }
 144
 145 /*
 146  * ACL auth ops.
 147  */
 148
 149 static ssize_t ft_nacl_show_port_name(
 150         struct se_node_acl *se_nacl,
 151         char *page)
 152 {
 153         struct ft_node_acl *acl = container_of(se_nacl,
 154                         struct ft_node_acl, se_node_acl);
 155
 156         return ft_wwn_show(&acl->node_auth.port_name, page);
 157 }
 158
 159 static ssize_t ft_nacl_store_port_name(
 160         struct se_node_acl *se_nacl,
 161         const char *page,
 162         size_t count)
 163 {
 164         struct ft_node_acl *acl = container_of(se_nacl,
 165                         struct ft_node_acl, se_node_acl);
 166
 167         return ft_wwn_store(&acl->node_auth.port_name, page, count);
 168 }
 169
 170 TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR);
 171
 172 static ssize_t ft_nacl_show_node_name(
 173         struct se_node_acl *se_nacl,
 174         char *page)
 175 {
 176         struct ft_node_acl *acl = container_of(se_nacl,
 177                         struct ft_node_acl, se_node_acl);
 178
 179         return ft_wwn_show(&acl->node_auth.node_name, page);
 180 }
 181
 182 static ssize_t ft_nacl_store_node_name(
 183         struct se_node_acl *se_nacl,
 184         const char *page,
 185         size_t count)
 186 {
 187         struct ft_node_acl *acl = container_of(se_nacl,
 188                         struct ft_node_acl, se_node_acl);
 189
 190         return ft_wwn_store(&acl->node_auth.node_name, page, count);
 191 }
 192
 193 TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR);
 194
 195 static struct configfs_attribute *ft_nacl_base_attrs[] = {
 196         &ft_nacl_port_name.attr,
 197         &ft_nacl_node_name.attr,
 198         NULL,
 199 };
 200
 201 /*
 202  * ACL ops.
 203  */
 204
 205 /*
 206  * Add ACL for an initiator.  The ACL is named arbitrarily.
 207  * The port_name and/or node_name are attributes.
 208  */
 209 static struct se_node_acl *ft_add_acl(
 210         struct se_portal_group *se_tpg,
 211         struct config_group *group,
 212         const char *name)
 213 {
 214         struct ft_node_acl *acl;
 215         struct ft_tpg *tpg;
 216         u64 wwpn;
 217         u32 q_depth;
 218
 219         FT_CONF_DBG("add acl %s\n", name);
 220         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 221
 222         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 223                 return ERR_PTR(-EINVAL);
 224
 225         acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL);
 226         if (!(acl))
 227                 return ERR_PTR(-ENOMEM);
 228         acl->node_auth.port_name = wwpn;
 229
 230         q_depth = 32;           /* XXX bogus default - get from tpg? */
 231         return core_tpg_add_initiator_node_acl(&tpg->se_tpg,
 232                                 &acl->se_node_acl, name, q_depth);
 233 }
 234
 235 static void ft_del_acl(struct se_node_acl *se_acl)
 236 {
 237         struct se_portal_group *se_tpg = se_acl->se_tpg;
 238         struct ft_tpg *tpg;
 239         struct ft_node_acl *acl = container_of(se_acl,
 240                                 struct ft_node_acl, se_node_acl);
 241
 242         FT_CONF_DBG("del acl %s\n",
 243                 config_item_name(&se_acl->acl_group.cg_item));
 244
 245         tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 246         FT_CONF_DBG("del acl %p se_acl %p tpg %p se_tpg %p\n",
 247                     acl, se_acl, tpg, &tpg->se_tpg);
 248
 249         core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1);
 250         kfree(acl);
 251 }
 252
 253 struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata)
 254 {
 255         struct ft_node_acl *found = NULL;
 256         struct ft_node_acl *acl;
 257         struct se_portal_group *se_tpg = &tpg->se_tpg;
 258         struct se_node_acl *se_acl;
 259
 260         spin_lock_bh(&se_tpg->acl_node_lock);
 261         list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) {
 262                 acl = container_of(se_acl, struct ft_node_acl, se_node_acl);
 263                 FT_CONF_DBG("acl %p port_name %llx\n",
 264                         acl, (unsigned long long)acl->node_auth.port_name);
 265                 if (acl->node_auth.port_name == rdata->ids.port_name ||
 266                     acl->node_auth.node_name == rdata->ids.node_name) {
 267                         FT_CONF_DBG("acl %p port_name %llx matched\n", acl,
 268                                     (unsigned long long)rdata->ids.port_name);
 269                         found = acl;
 270                         /* XXX need to hold onto ACL */
 271                         break;
 272                 }
 273         }
 274         spin_unlock_bh(&se_tpg->acl_node_lock);
 275         return found;
 276 }
 277
 278 struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg)
 279 {
 280         struct ft_node_acl *acl;
 281
 282         acl = kzalloc(sizeof(*acl), GFP_KERNEL);
 283         if (!(acl)) {
 284                 printk(KERN_ERR "Unable to allocate struct ft_node_acl\n");
 285                 return NULL;
 286         }
 287         FT_CONF_DBG("acl %p\n", acl);
 288         return &acl->se_node_acl;
 289 }
 290
 291 static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg,
 292                                       struct se_node_acl *se_acl)
 293 {
 294         struct ft_node_acl *acl = container_of(se_acl,
 295                                 struct ft_node_acl, se_node_acl);
 296
 297         FT_CONF_DBG(KERN_INFO "acl %p\n", acl);
 298         kfree(acl);
 299 }
 300
 301 /*
 302  * local_port port_group (tpg) ops.
 303  */
 304 static struct se_portal_group *ft_add_tpg(
 305         struct se_wwn *wwn,
 306         struct config_group *group,
 307         const char *name)
 308 {
 309         struct ft_lport_acl *lacl;
 310         struct ft_tpg *tpg;
 311         unsigned long index;
 312         int ret;
 313
 314         FT_CONF_DBG("tcm_fc: add tpg %s\n", name);
 315
 316         /*
 317          * Name must be "tpgt_" followed by the index.
 318          */
 319         if (strstr(name, "tpgt_") != name)
 320                 return NULL;
 321         if (strict_strtoul(name + 5, 10, &index) || index > UINT_MAX)
 322                 return NULL;
 323
 324         lacl = container_of(wwn, struct ft_lport_acl, fc_lport_wwn);
 325         tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
 326         if (!tpg)
 327                 return NULL;
 328         tpg->index = index;
 329         tpg->lport_acl = lacl;
 330         INIT_LIST_HEAD(&tpg->lun_list);
 331         transport_init_queue_obj(&tpg->qobj);
 332
 333         ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg,
 334                                 tpg, TRANSPORT_TPG_TYPE_NORMAL);
 335         if (ret < 0) {
 336                 kfree(tpg);
 337                 return NULL;
 338         }
 339
 340         tpg->thread = kthread_run(ft_thread, tpg, "ft_tpg%lu", index);
 341         if (IS_ERR(tpg->thread)) {
 342                 kfree(tpg);
 343                 return NULL;
 344         }
 345
 346         mutex_lock(&ft_lport_lock);
 347         list_add_tail(&tpg->list, &lacl->tpg_list);
 348         mutex_unlock(&ft_lport_lock);
 349
 350         return &tpg->se_tpg;
 351 }
 352
 353 static void ft_del_tpg(struct se_portal_group *se_tpg)
 354 {
 355         struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
 356
 357         FT_CONF_DBG("del tpg %s\n",
 358                     config_item_name(&tpg->se_tpg.tpg_group.cg_item));
 359
 360         kthread_stop(tpg->thread);
 361
 362         /* Wait for sessions to be freed thru RCU, for BUG_ON below */
 363         synchronize_rcu();
 364
 365         mutex_lock(&ft_lport_lock);
 366         list_del(&tpg->list);
 367         if (tpg->tport) {
 368                 tpg->tport->tpg = NULL;
 369                 tpg->tport = NULL;
 370         }
 371         mutex_unlock(&ft_lport_lock);
 372
 373         core_tpg_deregister(se_tpg);
 374         kfree(tpg);
 375 }
 376
 377 /*
 378  * Verify that an lport is configured to use the tcm_fc module, and return
 379  * the target port group that should be used.
 380  *
 381  * The caller holds ft_lport_lock.
 382  */
 383 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
 384 {
 385         struct ft_lport_acl *lacl;
 386         struct ft_tpg *tpg;
 387
 388         list_for_each_entry(lacl, &ft_lport_list, list) {
 389                 if (lacl->wwpn == lport->wwpn) {
 390                         list_for_each_entry(tpg, &lacl->tpg_list, list)
 391                                 return tpg; /* XXX for now return first entry */
 392                         return NULL;
 393                 }
 394         }
 395         return NULL;
 396 }
 397
 398 /*
 399  * target config instance ops.
 400  */
 401
 402 /*
 403  * Add lport to allowed config.
 404  * The name is the WWPN in lower-case ASCII, colon-separated bytes.
 405  */
 406 static struct se_wwn *ft_add_lport(
 407         struct target_fabric_configfs *tf,
 408         struct config_group *group,
 409         const char *name)
 410 {
 411         struct ft_lport_acl *lacl;
 412         struct ft_lport_acl *old_lacl;
 413         u64 wwpn;
 414
 415         FT_CONF_DBG("add lport %s\n", name);
 416         if (ft_parse_wwn(name, &wwpn, 1) < 0)
 417                 return NULL;
 418         lacl = kzalloc(sizeof(*lacl), GFP_KERNEL);
 419         if (!lacl)
 420                 return NULL;
 421         lacl->wwpn = wwpn;
 422         INIT_LIST_HEAD(&lacl->tpg_list);
 423
 424         mutex_lock(&ft_lport_lock);
 425         list_for_each_entry(old_lacl, &ft_lport_list, list) {
 426                 if (old_lacl->wwpn == wwpn) {
 427                         mutex_unlock(&ft_lport_lock);
 428                         kfree(lacl);
 429                         return NULL;
 430                 }
 431         }
 432         list_add_tail(&lacl->list, &ft_lport_list);
 433         ft_format_wwn(lacl->name, sizeof(lacl->name), wwpn);
 434         mutex_unlock(&ft_lport_lock);
 435
 436         return &lacl->fc_lport_wwn;
 437 }
 438
 439 static void ft_del_lport(struct se_wwn *wwn)
 440 {
 441         struct ft_lport_acl *lacl = container_of(wwn,
 442                                 struct ft_lport_acl, fc_lport_wwn);
 443
 444         FT_CONF_DBG("del lport %s\n",
 445                         config_item_name(&wwn->wwn_group.cg_item));
 446         mutex_lock(&ft_lport_lock);
 447         list_del(&lacl->list);
 448         mutex_unlock(&ft_lport_lock);
 449
 450         kfree(lacl);
 451 }
 452
 453 static ssize_t ft_wwn_show_attr_version(
 454         struct target_fabric_configfs *tf,
 455         char *page)
 456 {
 457         return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
 458                 ""UTS_RELEASE"\n",  utsname()->sysname, utsname()->machine);
 459 }
 460
 461 TF_WWN_ATTR_RO(ft, version);
 462
 463 static struct configfs_attribute *ft_wwn_attrs[] = {
 464         &ft_wwn_version.attr,
 465         NULL,
 466 };
 467
 468 static char *ft_get_fabric_name(void)
 469 {
 470         return "fc";
 471 }
 472
 473 static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
 474 {
 475         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 476
 477         return tpg->lport_acl->name;
 478 }
 479
 480 static u16 ft_get_tag(struct se_portal_group *se_tpg)
 481 {
 482         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 483
 484         /*
 485          * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
 486          * to represent the SCSI Target Port.
 487          */
 488         return tpg->index;
 489 }
 490
 491 static u32 ft_get_default_depth(struct se_portal_group *se_tpg)
 492 {
 493         return 1;
 494 }
 495
 496 static int ft_check_false(struct se_portal_group *se_tpg)
 497 {
 498         return 0;
 499 }
 500
 501 static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
 502 {
 503 }
 504
 505 static u16 ft_get_fabric_sense_len(void)
 506 {
 507         return 0;
 508 }
 509
 510 static u16 ft_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_len)
 511 {
 512         return 0;
 513 }
 514
 515 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
 516 {
 517         struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
 518
 519         return tpg->index;
 520 }
 521
 522 static struct target_core_fabric_ops ft_fabric_ops = {
 523         .get_fabric_name =              ft_get_fabric_name,
 524         .get_fabric_proto_ident =       fc_get_fabric_proto_ident,
 525         .tpg_get_wwn =                  ft_get_fabric_wwn,
 526         .tpg_get_tag =                  ft_get_tag,
 527         .tpg_get_default_depth =        ft_get_default_depth,
 528         .tpg_get_pr_transport_id =      fc_get_pr_transport_id,
 529         .tpg_get_pr_transport_id_len =  fc_get_pr_transport_id_len,
 530         .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id,
 531         .tpg_check_demo_mode =          ft_check_false,
 532         .tpg_check_demo_mode_cache =    ft_check_false,
 533         .tpg_check_demo_mode_write_protect = ft_check_false,
 534         .tpg_check_prod_mode_write_protect = ft_check_false,
 535         .tpg_alloc_fabric_acl =         ft_tpg_alloc_fabric_acl,
 536         .tpg_release_fabric_acl =       ft_tpg_release_fabric_acl,
 537         .tpg_get_inst_index =           ft_tpg_get_inst_index,
 538         .check_stop_free =              ft_check_stop_free,
 539         .release_cmd_to_pool =          ft_release_cmd,
 540         .release_cmd_direct =           ft_release_cmd,
 541         .shutdown_session =             ft_sess_shutdown,
 542         .close_session =                ft_sess_close,
 543         .stop_session =                 ft_sess_stop,
 544         .fall_back_to_erl0 =            ft_sess_set_erl0,
 545         .sess_logged_in =               ft_sess_logged_in,
 546         .sess_get_index =               ft_sess_get_index,
 547         .sess_get_initiator_sid =       NULL,
 548         .write_pending =                ft_write_pending,
 549         .write_pending_status =         ft_write_pending_status,
 550         .set_default_node_attributes =  ft_set_default_node_attr,
 551         .get_task_tag =                 ft_get_task_tag,
 552         .get_cmd_state =                ft_get_cmd_state,
 553         .new_cmd_failure =              ft_new_cmd_failure,
 554         .queue_data_in =                ft_queue_data_in,
 555         .queue_status =                 ft_queue_status,
 556         .queue_tm_rsp =                 ft_queue_tm_resp,
 557         .get_fabric_sense_len =         ft_get_fabric_sense_len,
 558         .set_fabric_sense_len =         ft_set_fabric_sense_len,
 559         .is_state_remove =              ft_is_state_remove,
 560         /*
 561          * Setup function pointers for generic logic in
 562          * target_core_fabric_configfs.c
 563          */
 564         .fabric_make_wwn =              &ft_add_lport,
 565         .fabric_drop_wwn =              &ft_del_lport,
 566         .fabric_make_tpg =              &ft_add_tpg,
 567         .fabric_drop_tpg =              &ft_del_tpg,
 568         .fabric_post_link =             NULL,
 569         .fabric_pre_unlink =            NULL,
 570         .fabric_make_np =               NULL,
 571         .fabric_drop_np =               NULL,
 572         .fabric_make_nodeacl =          &ft_add_acl,
 573         .fabric_drop_nodeacl =          &ft_del_acl,
 574 };
 575
 576 int ft_register_configfs(void)
 577 {
 578         struct target_fabric_configfs *fabric;
 579         int ret;
 580
 581         /*
 582          * Register the top level struct config_item_type with TCM core
 583          */
 584         fabric = target_fabric_configfs_init(THIS_MODULE, "fc");
 585         if (IS_ERR(fabric)) {
 586                 printk(KERN_INFO "%s: target_fabric_configfs_init() failed!\n",
 587                        __func__);
 588                 return PTR_ERR(fabric);
 589         }
 590         fabric->tf_ops = ft_fabric_ops;
 591
 592         /* Allowing support for task_sg_chaining */
 593         fabric->tf_ops.task_sg_chaining = 1;
 594
 595         /*
 596          * Setup default attribute lists for various fabric->tf_cit_tmpl
 597          */
 598         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = ft_wwn_attrs;
 599         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = NULL;
 600         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
 601         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
 602         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
 603         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs =
 604                                                     ft_nacl_base_attrs;
 605         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
 606         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
 607         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
 608         /*
 609          * register the fabric for use within TCM
 610          */
 611         ret = target_fabric_configfs_register(fabric);
 612         if (ret < 0) {
 613                 FT_CONF_DBG("target_fabric_configfs_register() for"
 614                             " FC Target failed!\n");
 615                 printk(KERN_INFO
 616                        "%s: target_fabric_configfs_register() failed!\n",
 617                        __func__);
 618                 target_fabric_configfs_free(fabric);
 619                 return -1;
 620         }
 621
 622         /*
 623          * Setup our local pointer to *fabric.
 624          */
 625         ft_configfs = fabric;
 626         return 0;
 627 }
 628
 629 void ft_deregister_configfs(void)
 630 {
 631         if (!ft_configfs)
 632                 return;
 633         target_fabric_configfs_deregister(ft_configfs);
 634         ft_configfs = NULL;
 635 }
 636
 637 static struct notifier_block ft_notifier = {
 638         .notifier_call = ft_lport_notify
 639 };
 640
 641 static int __init ft_init(void)
 642 {
 643         if (ft_register_configfs())
 644                 return -1;
 645         if (fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov)) {
 646                 ft_deregister_configfs();
 647                 return -1;
 648         }
 649         blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
 650         fc_lport_iterate(ft_lport_add, NULL);
 651         return 0;
 652 }
 653
 654 static void __exit ft_exit(void)
 655 {
 656         blocking_notifier_chain_unregister(&fc_lport_notifier_head,
 657                                            &ft_notifier);
 658         fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
 659         fc_lport_iterate(ft_lport_del, NULL);
 660         ft_deregister_configfs();
 661         synchronize_rcu();
 662 }
 663
 664 #ifdef MODULE
 665 MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
 666 MODULE_LICENSE("GPL");
 667 module_init(ft_init);
 668 module_exit(ft_exit);
 669 #endif /* MODULE */