aboutsummaryrefslogtreecommitdiff
path: root/drivers/target/tcm_fc/tfc_conf.c
blob: fcdbbffe88ccd635c6e692d0631484a424e7f7fc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
/*******************************************************************************
 * Filename:  tcm_fc.c
 *
 * This file contains the configfs implementation for TCM_fc fabric node.
 * Based on tcm_loop_configfs.c
 *
 * Copyright (c) 2010 Cisco Systems, Inc.
 * Copyright (c) 2009,2010 Rising Tide, Inc.
 * Copyright (c) 2009,2010 Linux-iSCSI.org
 *
 * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ****************************************************************************/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <generated/utsrelease.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/configfs.h>
#include <linux/ctype.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/libfc.h>

#include <target/target_core_base.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include <target/target_core_fabric_configfs.h>
#include <target/target_core_fabric_lib.h>
#include <target/target_core_device.h>
#include <target/target_core_tpg.h>
#include <target/target_core_configfs.h>
#include <target/target_core_base.h>
#include <target/configfs_macros.h>

#include "tcm_fc.h"

struct target_fabric_configfs *ft_configfs;

LIST_HEAD(ft_lport_list);
DEFINE_MUTEX(ft_lport_lock);

unsigned int ft_debug_logging;
module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");

/*
 * Parse WWN.
 * If strict, we require lower-case hex and colon separators to be sure
 * the name is the same as what would be generated by ft_format_wwn()
 * so the name and wwn are mapped one-to-one.
 */
static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
{
	const char *cp;
	char c;
	u32 nibble;
	u32 byte = 0;
	u32 pos = 0;
	u32 err;

	*wwn = 0;
	for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
		c = *cp;
		if (c == '\n' && cp[1] == '\0')
			continue;
		if (strict && pos++ == 2 && byte++ < 7) {
			pos = 0;
			if (c == ':')
				continue;
			err = 1;
			goto fail;
		}
		if (c == '\0') {
			err = 2;
			if (strict && byte != 8)
				goto fail;
			return cp - name;
		}
		err = 3;
		if (isdigit(c))
			nibble = c - '0';
		else if (isxdigit(c) && (islower(c) || !strict))
			nibble = tolower(c) - 'a' + 10;
		else
			goto fail;
		*wwn = (*wwn << 4) | nibble;
	}
	err = 4;
fail:
	FT_CONF_DBG("err %u len %zu pos %u byte %u\n",
		    err, cp - name, pos, byte);
	return -1;
}

ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
{
	u8 b[8];

	put_unaligned_be64(wwn, b);
	return snprintf(buf, len,
		 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
		 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
}

static ssize_t ft_wwn_show(void *arg, char *buf)
{
	u64 *wwn = arg;
	ssize_t len;

	len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
	buf[len++] = '\n';
	return len;
}

static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
{
	ssize_t ret;
	u64 wwn;

	ret = ft_parse_wwn(buf, &wwn, 0);
	if (ret > 0)
		*(u64 *)arg = wwn;
	return ret;
}

/*
 * ACL auth ops.
 */

static ssize_t ft_nacl_show_port_name(
	struct se_node_acl *se_nacl,
	char *page)
{
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_show(&acl->node_auth.port_name, page);
}

static ssize_t ft_nacl_store_port_name(
	struct se_node_acl *se_nacl,
	const char *page,
	size_t count)
{
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_store(&acl->node_auth.port_name, page, count);
}

TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR);

static ssize_t ft_nacl_show_node_name(
	struct se_node_acl *se_nacl,
	char *page)
{
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_show(&acl->node_auth.node_name, page);
}

static ssize_t ft_nacl_store_node_name(
	struct se_node_acl *se_nacl,
	const char *page,
	size_t count)
{
	struct ft_node_acl *acl = container_of(se_nacl,
			struct ft_node_acl, se_node_acl);

	return ft_wwn_store(&acl->node_auth.node_name, page, count);
}

TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR);

static struct configfs_attribute *ft_nacl_base_attrs[] = {
	&ft_nacl_port_name.attr,
	&ft_nacl_node_name.attr,
	NULL,
};

/*
 * ACL ops.
 */

/*
 * Add ACL for an initiator.  The ACL is named arbitrarily.
 * The port_name and/or node_name are attributes.
 */
static struct se_node_acl *ft_add_acl(
	struct se_portal_group *se_tpg,
	struct config_group *group,
	const char *name)
{
	struct ft_node_acl *acl;
	struct ft_tpg *tpg;
	u64 wwpn;
	u32 q_depth;

	FT_CONF_DBG("add acl %s\n", name);
	tpg = container_of(se_tpg, struct ft_tpg, se_tpg);

	if (ft_parse_wwn(name, &wwpn, 1) < 0)
		return ERR_PTR(-EINVAL);

	acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL);
	if (!(acl))
		return ERR_PTR(-ENOMEM);
	acl->node_auth.port_name = wwpn;

	q_depth = 32;		/* XXX bogus default - get from tpg? */
	return core_tpg_add_initiator_node_acl(&tpg->se_tpg,
				&acl->se_node_acl, name, q_depth);
}

static void ft_del_acl(struct se_node_acl *se_acl)
{
	struct se_portal_group *se_tpg = se_acl->se_tpg;
	struct ft_tpg *tpg;
	struct ft_node_acl *acl = container_of(se_acl,
				struct ft_node_acl, se_node_acl);

	FT_CONF_DBG("del acl %s\n",
		config_item_name(&se_acl->acl_group.cg_item));

	tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
	FT_CONF_DBG("del acl %p se_acl %p tpg %p se_tpg %p\n",
		    acl, se_acl, tpg, &tpg->se_tpg);

	core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1);
	kfree(acl);
}

struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata)
{
	struct ft_node_acl *found = NULL;
	struct ft_node_acl *acl;
	struct se_portal_group *se_tpg = &tpg->se_tpg;
	struct se_node_acl *se_acl;

	spin_lock_bh(&se_tpg->acl_node_lock);
	list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) {
		acl = container_of(se_acl, struct ft_node_acl, se_node_acl);
		FT_CONF_DBG("acl %p port_name %llx\n",
			acl, (unsigned long long)acl->node_auth.port_name);
		if (acl->node_auth.port_name == rdata->ids.port_name ||
		    acl->node_auth.node_name == rdata->ids.node_name) {
			FT_CONF_DBG("acl %p port_name %llx matched\n", acl,
				    (unsigned long long)rdata->ids.port_name);
			found = acl;
			/* XXX need to hold onto ACL */
			break;
		}
	}
	spin_unlock_bh(&se_tpg->acl_node_lock);
	return found;
}

struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg)
{
	struct ft_node_acl *acl;

	acl = kzalloc(sizeof(*acl), GFP_KERNEL);
	if (!(acl)) {
		printk(KERN_ERR "Unable to allocate struct ft_node_acl\n");
		return NULL;
	}
	FT_CONF_DBG("acl %p\n", acl);
	return &acl->se_node_acl;
}

static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg,
				      struct se_node_acl *se_acl)
{
	struct ft_node_acl *acl = container_of(se_acl,
				struct ft_node_acl, se_node_acl);

	FT_CONF_DBG(KERN_INFO "acl %p\n", acl);
	kfree(acl);
}

/*
 * local_port port_group (tpg) ops.
 */
static struct se_portal_group *ft_add_tpg(
	struct se_wwn *wwn,
	struct config_group *group,
	const char *name)
{
	struct ft_lport_acl *lacl;
	struct ft_tpg *tpg;
	unsigned long index;
	int ret;

	FT_CONF_DBG("tcm_fc: add tpg %s\n", name);

	/*
	 * Name must be "tpgt_" followed by the index.
	 */
	if (strstr(name, "tpgt_") != name)
		return NULL;
	if (strict_strtoul(name + 5, 10, &index) || index > UINT_MAX)
		return NULL;

	lacl = container_of(wwn, struct ft_lport_acl, fc_lport_wwn);
	tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
	if (!tpg)
		return NULL;
	tpg->index = index;
	tpg->lport_acl = lacl;
	INIT_LIST_HEAD(&tpg->lun_list);
	transport_init_queue_obj(&tpg->qobj);

	ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg,
				(void *)tpg, TRANSPORT_TPG_TYPE_NORMAL);
	if (ret < 0) {
		kfree(tpg);
		return NULL;
	}

	tpg->thread = kthread_run(ft_thread, tpg, "ft_tpg%lu", index);
	if (IS_ERR(tpg->thread)) {
		kfree(tpg);
		return NULL;
	}

	mutex_lock(&ft_lport_lock);
	list_add_tail(&tpg->list, &lacl->tpg_list);
	mutex_unlock(&ft_lport_lock);

	return &tpg->se_tpg;
}

static void ft_del_tpg(struct se_portal_group *se_tpg)
{
	struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);

	FT_CONF_DBG("del tpg %s\n",
		    config_item_name(&tpg->se_tpg.tpg_group.cg_item));

	kthread_stop(tpg->thread);

	/* Wait for sessions to be freed thru RCU, for BUG_ON below */
	synchronize_rcu();

	mutex_lock(&ft_lport_lock);
	list_del(&tpg->list);
	if (tpg->tport) {
		tpg->tport->tpg = NULL;
		tpg->tport = NULL;
	}
	mutex_unlock(&ft_lport_lock);

	core_tpg_deregister(se_tpg);
	kfree(tpg);
}

/*
 * Verify that an lport is configured to use the tcm_fc module, and return
 * the target port group that should be used.
 *
 * The caller holds ft_lport_lock.
 */
struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
{
	struct ft_lport_acl *lacl;
	struct ft_tpg *tpg;

	list_for_each_entry(lacl, &ft_lport_list, list) {
		if (lacl->wwpn == lport->wwpn) {
			list_for_each_entry(tpg, &lacl->tpg_list, list)
				return tpg; /* XXX for now return first entry */
			return NULL;
		}
	}
	return NULL;
}

/*
 * target config instance ops.
 */

/*
 * Add lport to allowed config.
 * The name is the WWPN in lower-case ASCII, colon-separated bytes.
 */
static struct se_wwn *ft_add_lport(
	struct target_fabric_configfs *tf,
	struct config_group *group,
	const char *name)
{
	struct ft_lport_acl *lacl;
	struct ft_lport_acl *old_lacl;
	u64 wwpn;

	FT_CONF_DBG("add lport %s\n", name);
	if (ft_parse_wwn(name, &wwpn, 1) < 0)
		return NULL;
	lacl = kzalloc(sizeof(*lacl), GFP_KERNEL);
	if (!lacl)
		return NULL;
	lacl->wwpn = wwpn;
	INIT_LIST_HEAD(&lacl->tpg_list);

	mutex_lock(&ft_lport_lock);
	list_for_each_entry(old_lacl, &ft_lport_list, list) {
		if (old_lacl->wwpn == wwpn) {
			mutex_unlock(&ft_lport_lock);
			kfree(lacl);
			return NULL;
		}
	}
	list_add_tail(&lacl->list, &ft_lport_list);
	ft_format_wwn(lacl->name, sizeof(lacl->name), wwpn);
	mutex_unlock(&ft_lport_lock);

	return &lacl->fc_lport_wwn;
}

static void ft_del_lport(struct se_wwn *wwn)
{
	struct ft_lport_acl *lacl = container_of(wwn,
				struct ft_lport_acl, fc_lport_wwn);

	FT_CONF_DBG("del lport %s\n",
			config_item_name(&wwn->wwn_group.cg_item));
	mutex_lock(&ft_lport_lock);
	list_del(&lacl->list);
	mutex_unlock(&ft_lport_lock);

	kfree(lacl);
}

static ssize_t ft_wwn_show_attr_version(
	struct target_fabric_configfs *tf,
	char *page)
{
	return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
		""UTS_RELEASE"\n",  utsname()->sysname, utsname()->machine);
}

TF_WWN_ATTR_RO(ft, version);

static struct configfs_attribute *ft_wwn_attrs[] = {
	&ft_wwn_version.attr,
	NULL,
};

static char *ft_get_fabric_name(void)
{
	return "fc";
}

static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
{
	struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;

	return tpg->lport_acl->name;
}

static u16 ft_get_tag(struct se_portal_group *se_tpg)
{
	struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;

	/*
	 * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
	 * to represent the SCSI Target Port.
	 */
	return tpg->index;
}

static u32 ft_get_default_depth(struct se_portal_group *se_tpg)
{
	return 1;
}

static int ft_check_false(struct se_portal_group *se_tpg)
{
	return 0;
}

static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
{
}

static u16 ft_get_fabric_sense_len(void)
{
	return 0;
}

static u16 ft_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_len)
{
	return 0;
}

static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
{
	struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;

	return tpg->index;
}

static u64 ft_pack_lun(unsigned int index)
{
	WARN_ON(index >= 256);
	/* Caller wants this byte-swapped */
	return cpu_to_le64((index & 0xff) << 8);
}

static struct target_core_fabric_ops ft_fabric_ops = {
	.get_fabric_name =		ft_get_fabric_name,
	.get_fabric_proto_ident =	fc_get_fabric_proto_ident,
	.tpg_get_wwn =			ft_get_fabric_wwn,
	.tpg_get_tag =			ft_get_tag,
	.tpg_get_default_depth =	ft_get_default_depth,
	.tpg_get_pr_transport_id =	fc_get_pr_transport_id,
	.tpg_get_pr_transport_id_len =	fc_get_pr_transport_id_len,
	.tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id,
	.tpg_check_demo_mode =		ft_check_false,
	.tpg_check_demo_mode_cache =	ft_check_false,
	.tpg_check_demo_mode_write_protect = ft_check_false,
	.tpg_check_prod_mode_write_protect = ft_check_false,
	.tpg_alloc_fabric_acl =		ft_tpg_alloc_fabric_acl,
	.tpg_release_fabric_acl =	ft_tpg_release_fabric_acl,
	.tpg_get_inst_index =		ft_tpg_get_inst_index,
	.check_stop_free =		ft_check_stop_free,
	.release_cmd_to_pool =		ft_release_cmd,
	.release_cmd_direct =		ft_release_cmd,
	.shutdown_session =		ft_sess_shutdown,
	.close_session =		ft_sess_close,
	.stop_session =			ft_sess_stop,
	.fall_back_to_erl0 =		ft_sess_set_erl0,
	.sess_logged_in =		ft_sess_logged_in,
	.sess_get_index =		ft_sess_get_index,
	.sess_get_initiator_sid =	NULL,
	.write_pending =		ft_write_pending,
	.write_pending_status =		ft_write_pending_status,
	.set_default_node_attributes =	ft_set_default_node_attr,
	.get_task_tag =			ft_get_task_tag,
	.get_cmd_state =		ft_get_cmd_state,
	.new_cmd_failure =		ft_new_cmd_failure,
	.queue_data_in =		ft_queue_data_in,
	.queue_status =			ft_queue_status,
	.queue_tm_rsp =			ft_queue_tm_resp,
	.get_fabric_sense_len =		ft_get_fabric_sense_len,
	.set_fabric_sense_len =		ft_set_fabric_sense_len,
	.is_state_remove =		ft_is_state_remove,
	.pack_lun =			ft_pack_lun,
	/*
	 * Setup function pointers for generic logic in
	 * target_core_fabric_configfs.c
	 */
	.fabric_make_wwn =		&ft_add_lport,
	.fabric_drop_wwn =		&ft_del_lport,
	.fabric_make_tpg =		&ft_add_tpg,
	.fabric_drop_tpg =		&ft_del_tpg,
	.fabric_post_link =		NULL,
	.fabric_pre_unlink =		NULL,
	.fabric_make_np =		NULL,
	.fabric_drop_np =		NULL,
	.fabric_make_nodeacl =		&ft_add_acl,
	.fabric_drop_nodeacl =		&ft_del_acl,
};

int ft_register_configfs(void)
{
	struct target_fabric_configfs *fabric;
	int ret;

	/*
	 * Register the top level struct config_item_type with TCM core
	 */
	fabric = target_fabric_configfs_init(THIS_MODULE, "fc");
	if (!fabric) {
		printk(KERN_INFO "%s: target_fabric_configfs_init() failed!\n",
		       __func__);
		return -1;
	}
	fabric->tf_ops = ft_fabric_ops;

	/* Allowing support for task_sg_chaining */
	fabric->tf_ops.task_sg_chaining = 1;

	/*
	 * Setup default attribute lists for various fabric->tf_cit_tmpl
	 */
	TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = ft_wwn_attrs;
	TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = NULL;
	TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
	TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
	TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs =
						    ft_nacl_base_attrs;
	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
	TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
	/*
	 * register the fabric for use within TCM
	 */
	ret = target_fabric_configfs_register(fabric);
	if (ret < 0) {
		FT_CONF_DBG("target_fabric_configfs_register() for"
			    " FC Target failed!\n");
		printk(KERN_INFO
		       "%s: target_fabric_configfs_register() failed!\n",
		       __func__);
		target_fabric_configfs_free(fabric);
		return -1;
	}

	/*
	 * Setup our local pointer to *fabric.
	 */
	ft_configfs = fabric;
	return 0;
}

void ft_deregister_configfs(void)
{
	if (!ft_configfs)
		return;
	target_fabric_configfs_deregister(ft_configfs);
	ft_configfs = NULL;
}

static struct notifier_block ft_notifier = {
	.notifier_call = ft_lport_notify
};

static int __init ft_init(void)
{
	if (ft_register_configfs())
		return -1;
	if (fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov)) {
		ft_deregister_configfs();
		return -1;
	}
	blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
	fc_lport_iterate(ft_lport_add, NULL);
	return 0;
}

static void __exit ft_exit(void)
{
	blocking_notifier_chain_unregister(&fc_lport_notifier_head,
					   &ft_notifier);
	fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
	fc_lport_iterate(ft_lport_del, NULL);
	ft_deregister_configfs();
	synchronize_rcu();
}

#ifdef MODULE
MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
MODULE_LICENSE("GPL");
module_init(ft_init);
module_exit(ft_exit);
#endif /* MODULE */