summaryrefslogtreecommitdiffstats
path: root/drivers/target/target_core_tpg.c
blob: 448129f74cf9060b4268ee6ebf0c147bc3ea824c (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
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
/*******************************************************************************
 * Filename:  target_core_tpg.c
 *
 * This file contains generic Target Portal Group related functions.
 *
 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
 * Copyright (c) 2007-2010 Rising Tide Systems
 * Copyright (c) 2008-2010 Linux-iSCSI.org
 *
 * Nicholas A. Bellinger <nab@kernel.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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 ******************************************************************************/

#include <linux/net.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/in.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include <target/target_core_base.h>
#include <target/target_core_device.h>
#include <target/target_core_tpg.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>

#include "target_core_hba.h"
#include "target_core_stat.h"

extern struct se_device *g_lun0_dev;

static DEFINE_SPINLOCK(tpg_lock);
static LIST_HEAD(tpg_list);

/*	core_clear_initiator_node_from_tpg():
 *
 *
 */
static void core_clear_initiator_node_from_tpg(
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	int i;
	struct se_dev_entry *deve;
	struct se_lun *lun;
	struct se_lun_acl *acl, *acl_tmp;

	spin_lock_irq(&nacl->device_list_lock);
	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
		deve = &nacl->device_list[i];

		if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
			continue;

		if (!deve->se_lun) {
			printk(KERN_ERR "%s device entries device pointer is"
				" NULL, but Initiator has access.\n",
				tpg->se_tpg_tfo->get_fabric_name());
			continue;
		}

		lun = deve->se_lun;
		spin_unlock_irq(&nacl->device_list_lock);
		core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
			TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);

		spin_lock(&lun->lun_acl_lock);
		list_for_each_entry_safe(acl, acl_tmp,
					&lun->lun_acl_list, lacl_list) {
			if (!(strcmp(acl->initiatorname,
					nacl->initiatorname)) &&
			     (acl->mapped_lun == deve->mapped_lun))
				break;
		}

		if (!acl) {
			printk(KERN_ERR "Unable to locate struct se_lun_acl for %s,"
				" mapped_lun: %u\n", nacl->initiatorname,
				deve->mapped_lun);
			spin_unlock(&lun->lun_acl_lock);
			spin_lock_irq(&nacl->device_list_lock);
			continue;
		}

		list_del(&acl->lacl_list);
		spin_unlock(&lun->lun_acl_lock);

		spin_lock_irq(&nacl->device_list_lock);
		kfree(acl);
	}
	spin_unlock_irq(&nacl->device_list_lock);
}

/*	__core_tpg_get_initiator_node_acl():
 *
 *	spin_lock_bh(&tpg->acl_node_lock); must be held when calling
 */
struct se_node_acl *__core_tpg_get_initiator_node_acl(
	struct se_portal_group *tpg,
	const char *initiatorname)
{
	struct se_node_acl *acl;

	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
		if (!(strcmp(acl->initiatorname, initiatorname)))
			return acl;
	}

	return NULL;
}

/*	core_tpg_get_initiator_node_acl():
 *
 *
 */
struct se_node_acl *core_tpg_get_initiator_node_acl(
	struct se_portal_group *tpg,
	unsigned char *initiatorname)
{
	struct se_node_acl *acl;

	spin_lock_bh(&tpg->acl_node_lock);
	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
		if (!(strcmp(acl->initiatorname, initiatorname)) &&
		   (!(acl->dynamic_node_acl))) {
			spin_unlock_bh(&tpg->acl_node_lock);
			return acl;
		}
	}
	spin_unlock_bh(&tpg->acl_node_lock);

	return NULL;
}

/*	core_tpg_add_node_to_devs():
 *
 *
 */
void core_tpg_add_node_to_devs(
	struct se_node_acl *acl,
	struct se_portal_group *tpg)
{
	int i = 0;
	u32 lun_access = 0;
	struct se_lun *lun;
	struct se_device *dev;

	spin_lock(&tpg->tpg_lun_lock);
	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
		lun = &tpg->tpg_lun_list[i];
		if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
			continue;

		spin_unlock(&tpg->tpg_lun_lock);

		dev = lun->lun_se_dev;
		/*
		 * By default in LIO-Target $FABRIC_MOD,
		 * demo_mode_write_protect is ON, or READ_ONLY;
		 */
		if (!(tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg))) {
			if (dev->dev_flags & DF_READ_ONLY)
				lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
			else
				lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
		} else {
			/*
			 * Allow only optical drives to issue R/W in default RO
			 * demo mode.
			 */
			if (dev->transport->get_device_type(dev) == TYPE_DISK)
				lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
			else
				lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
		}

		printk(KERN_INFO "TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
			" access for LUN in Demo Mode\n",
			tpg->se_tpg_tfo->get_fabric_name(),
			tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
			(lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
			"READ-WRITE" : "READ-ONLY");

		core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
				lun_access, acl, tpg, 1);
		spin_lock(&tpg->tpg_lun_lock);
	}
	spin_unlock(&tpg->tpg_lun_lock);
}

/*      core_set_queue_depth_for_node():
 *
 *
 */
static int core_set_queue_depth_for_node(
	struct se_portal_group *tpg,
	struct se_node_acl *acl)
{
	if (!acl->queue_depth) {
		printk(KERN_ERR "Queue depth for %s Initiator Node: %s is 0,"
			"defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
			acl->initiatorname);
		acl->queue_depth = 1;
	}

	return 0;
}

/*      core_create_device_list_for_node():
 *
 *
 */
static int core_create_device_list_for_node(struct se_node_acl *nacl)
{
	struct se_dev_entry *deve;
	int i;

	nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
				TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
	if (!(nacl->device_list)) {
		printk(KERN_ERR "Unable to allocate memory for"
			" struct se_node_acl->device_list\n");
		return -ENOMEM;
	}
	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
		deve = &nacl->device_list[i];

		atomic_set(&deve->ua_count, 0);
		atomic_set(&deve->pr_ref_count, 0);
		spin_lock_init(&deve->ua_lock);
		INIT_LIST_HEAD(&deve->alua_port_list);
		INIT_LIST_HEAD(&deve->ua_list);
	}

	return 0;
}

/*	core_tpg_check_initiator_node_acl()
 *
 *
 */
struct se_node_acl *core_tpg_check_initiator_node_acl(
	struct se_portal_group *tpg,
	unsigned char *initiatorname)
{
	struct se_node_acl *acl;

	acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
	if ((acl))
		return acl;

	if (!(tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)))
		return NULL;

	acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
	if (!(acl))
		return NULL;

	INIT_LIST_HEAD(&acl->acl_list);
	INIT_LIST_HEAD(&acl->acl_sess_list);
	spin_lock_init(&acl->device_list_lock);
	spin_lock_init(&acl->nacl_sess_lock);
	atomic_set(&acl->acl_pr_ref_count, 0);
	acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
	acl->se_tpg = tpg;
	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
	spin_lock_init(&acl->stats_lock);
	acl->dynamic_node_acl = 1;

	tpg->se_tpg_tfo->set_default_node_attributes(acl);

	if (core_create_device_list_for_node(acl) < 0) {
		tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
		return NULL;
	}

	if (core_set_queue_depth_for_node(tpg, acl) < 0) {
		core_free_device_list_for_node(acl, tpg);
		tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
		return NULL;
	}

	core_tpg_add_node_to_devs(acl, tpg);

	spin_lock_bh(&tpg->acl_node_lock);
	list_add_tail(&acl->acl_list, &tpg->acl_node_list);
	tpg->num_node_acls++;
	spin_unlock_bh(&tpg->acl_node_lock);

	printk("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
		" Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
		tpg->se_tpg_tfo->get_fabric_name(), initiatorname);

	return acl;
}
EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);

void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
{
	while (atomic_read(&nacl->acl_pr_ref_count) != 0)
		cpu_relax();
}

void core_tpg_clear_object_luns(struct se_portal_group *tpg)
{
	int i, ret;
	struct se_lun *lun;

	spin_lock(&tpg->tpg_lun_lock);
	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
		lun = &tpg->tpg_lun_list[i];

		if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
		    (lun->lun_se_dev == NULL))
			continue;

		spin_unlock(&tpg->tpg_lun_lock);
		ret = core_dev_del_lun(tpg, lun->unpacked_lun);
		spin_lock(&tpg->tpg_lun_lock);
	}
	spin_unlock(&tpg->tpg_lun_lock);
}
EXPORT_SYMBOL(core_tpg_clear_object_luns);

/*	core_tpg_add_initiator_node_acl():
 *
 *
 */
struct se_node_acl *core_tpg_add_initiator_node_acl(
	struct se_portal_group *tpg,
	struct se_node_acl *se_nacl,
	const char *initiatorname,
	u32 queue_depth)
{
	struct se_node_acl *acl = NULL;

	spin_lock_bh(&tpg->acl_node_lock);
	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
	if ((acl)) {
		if (acl->dynamic_node_acl) {
			acl->dynamic_node_acl = 0;
			printk(KERN_INFO "%s_TPG[%u] - Replacing dynamic ACL"
				" for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
				tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
			spin_unlock_bh(&tpg->acl_node_lock);
			/*
			 * Release the locally allocated struct se_node_acl
			 * because * core_tpg_add_initiator_node_acl() returned
			 * a pointer to an existing demo mode node ACL.
			 */
			if (se_nacl)
				tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
							se_nacl);
			goto done;
		}

		printk(KERN_ERR "ACL entry for %s Initiator"
			" Node %s already exists for TPG %u, ignoring"
			" request.\n",  tpg->se_tpg_tfo->get_fabric_name(),
			initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
		spin_unlock_bh(&tpg->acl_node_lock);
		return ERR_PTR(-EEXIST);
	}
	spin_unlock_bh(&tpg->acl_node_lock);

	if (!(se_nacl)) {
		printk("struct se_node_acl pointer is NULL\n");
		return ERR_PTR(-EINVAL);
	}
	/*
	 * For v4.x logic the se_node_acl_s is hanging off a fabric
	 * dependent structure allocated via
	 * struct target_core_fabric_ops->fabric_make_nodeacl()
	 */
	acl = se_nacl;

	INIT_LIST_HEAD(&acl->acl_list);
	INIT_LIST_HEAD(&acl->acl_sess_list);
	spin_lock_init(&acl->device_list_lock);
	spin_lock_init(&acl->nacl_sess_lock);
	atomic_set(&acl->acl_pr_ref_count, 0);
	acl->queue_depth = queue_depth;
	snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
	acl->se_tpg = tpg;
	acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
	spin_lock_init(&acl->stats_lock);

	tpg->se_tpg_tfo->set_default_node_attributes(acl);

	if (core_create_device_list_for_node(acl) < 0) {
		tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
		return ERR_PTR(-ENOMEM);
	}

	if (core_set_queue_depth_for_node(tpg, acl) < 0) {
		core_free_device_list_for_node(acl, tpg);
		tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
		return ERR_PTR(-EINVAL);
	}

	spin_lock_bh(&tpg->acl_node_lock);
	list_add_tail(&acl->acl_list, &tpg->acl_node_list);
	tpg->num_node_acls++;
	spin_unlock_bh(&tpg->acl_node_lock);

done:
	printk(KERN_INFO "%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
		" Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
		tpg->se_tpg_tfo->get_fabric_name(), initiatorname);

	return acl;
}
EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);

/*	core_tpg_del_initiator_node_acl():
 *
 *
 */
int core_tpg_del_initiator_node_acl(
	struct se_portal_group *tpg,
	struct se_node_acl *acl,
	int force)
{
	struct se_session *sess, *sess_tmp;
	int dynamic_acl = 0;

	spin_lock_bh(&tpg->acl_node_lock);
	if (acl->dynamic_node_acl) {
		acl->dynamic_node_acl = 0;
		dynamic_acl = 1;
	}
	list_del(&acl->acl_list);
	tpg->num_node_acls--;
	spin_unlock_bh(&tpg->acl_node_lock);

	spin_lock_bh(&tpg->session_lock);
	list_for_each_entry_safe(sess, sess_tmp,
				&tpg->tpg_sess_list, sess_list) {
		if (sess->se_node_acl != acl)
			continue;
		/*
		 * Determine if the session needs to be closed by our context.
		 */
		if (!(tpg->se_tpg_tfo->shutdown_session(sess)))
			continue;

		spin_unlock_bh(&tpg->session_lock);
		/*
		 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
		 * forcefully shutdown the $FABRIC_MOD session/nexus.
		 */
		tpg->se_tpg_tfo->close_session(sess);

		spin_lock_bh(&tpg->session_lock);
	}
	spin_unlock_bh(&tpg->session_lock);

	core_tpg_wait_for_nacl_pr_ref(acl);
	core_clear_initiator_node_from_tpg(acl, tpg);
	core_free_device_list_for_node(acl, tpg);

	printk(KERN_INFO "%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
		" Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
		tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);

	return 0;
}
EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);

/*	core_tpg_set_initiator_node_queue_depth():
 *
 *
 */
int core_tpg_set_initiator_node_queue_depth(
	struct se_portal_group *tpg,
	unsigned char *initiatorname,
	u32 queue_depth,
	int force)
{
	struct se_session *sess, *init_sess = NULL;
	struct se_node_acl *acl;
	int dynamic_acl = 0;

	spin_lock_bh(&tpg->acl_node_lock);
	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
	if (!(acl)) {
		printk(KERN_ERR "Access Control List entry for %s Initiator"
			" Node %s does not exists for TPG %hu, ignoring"
			" request.\n", tpg->se_tpg_tfo->get_fabric_name(),
			initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
		spin_unlock_bh(&tpg->acl_node_lock);
		return -ENODEV;
	}
	if (acl->dynamic_node_acl) {
		acl->dynamic_node_acl = 0;
		dynamic_acl = 1;
	}
	spin_unlock_bh(&tpg->acl_node_lock);

	spin_lock_bh(&tpg->session_lock);
	list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
		if (sess->se_node_acl != acl)
			continue;

		if (!force) {
			printk(KERN_ERR "Unable to change queue depth for %s"
				" Initiator Node: %s while session is"
				" operational.  To forcefully change the queue"
				" depth and force session reinstatement"
				" use the \"force=1\" parameter.\n",
				tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
			spin_unlock_bh(&tpg->session_lock);

			spin_lock_bh(&tpg->acl_node_lock);
			if (dynamic_acl)
				acl->dynamic_node_acl = 1;
			spin_unlock_bh(&tpg->acl_node_lock);
			return -EEXIST;
		}
		/*
		 * Determine if the session needs to be closed by our context.
		 */
		if (!(tpg->se_tpg_tfo->shutdown_session(sess)))
			continue;

		init_sess = sess;
		break;
	}

	/*
	 * User has requested to change the queue depth for a Initiator Node.
	 * Change the value in the Node's struct se_node_acl, and call
	 * core_set_queue_depth_for_node() to add the requested queue depth.
	 *
	 * Finally call  tpg->se_tpg_tfo->close_session() to force session
	 * reinstatement to occur if there is an active session for the
	 * $FABRIC_MOD Initiator Node in question.
	 */
	acl->queue_depth = queue_depth;

	if (core_set_queue_depth_for_node(tpg, acl) < 0) {
		spin_unlock_bh(&tpg->session_lock);
		/*
		 * Force session reinstatement if
		 * core_set_queue_depth_for_node() failed, because we assume
		 * the $FABRIC_MOD has already the set session reinstatement
		 * bit from tpg->se_tpg_tfo->shutdown_session() called above.
		 */
		if (init_sess)
			tpg->se_tpg_tfo->close_session(init_sess);

		spin_lock_bh(&tpg->acl_node_lock);
		if (dynamic_acl)
			acl->dynamic_node_acl = 1;
		spin_unlock_bh(&tpg->acl_node_lock);
		return -EINVAL;
	}
	spin_unlock_bh(&tpg->session_lock);
	/*
	 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
	 * forcefully shutdown the $FABRIC_MOD session/nexus.
	 */
	if (init_sess)
		tpg->se_tpg_tfo->close_session(init_sess);

	printk(KERN_INFO "Successfuly changed queue depth to: %d for Initiator"
		" Node: %s on %s Target Portal Group: %u\n", queue_depth,
		initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg));

	spin_lock_bh(&tpg->acl_node_lock);
	if (dynamic_acl)
		acl->dynamic_node_acl = 1;
	spin_unlock_bh(&tpg->acl_node_lock);

	return 0;
}
EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);

static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
{
	/* Set in core_dev_setup_virtual_lun0() */
	struct se_device *dev = g_lun0_dev;
	struct se_lun *lun = &se_tpg->tpg_virt_lun0;
	u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
	int ret;

	lun->unpacked_lun = 0;
	lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
	atomic_set(&lun->lun_acl_count, 0);
	init_completion(&lun->lun_shutdown_comp);
	INIT_LIST_HEAD(&lun->lun_acl_list);
	INIT_LIST_HEAD(&lun->lun_cmd_list);
	spin_lock_init(&lun->lun_acl_lock);
	spin_lock_init(&lun->lun_cmd_lock);
	spin_lock_init(&lun->lun_sep_lock);

	ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
	if (ret < 0)
		return ret;

	return 0;
}

static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
{
	struct se_lun *lun = &se_tpg->tpg_virt_lun0;

	core_tpg_post_dellun(se_tpg, lun);
}

int core_tpg_register(
	struct target_core_fabric_ops *tfo,
	struct se_wwn *se_wwn,
	struct se_portal_group *se_tpg,
	void *tpg_fabric_ptr,
	int se_tpg_type)
{
	struct se_lun *lun;
	u32 i;

	se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
				TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
	if (!(se_tpg->tpg_lun_list)) {
		printk(KERN_ERR "Unable to allocate struct se_portal_group->"
				"tpg_lun_list\n");
		return -ENOMEM;
	}

	for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
		lun = &se_tpg->tpg_lun_list[i];
		lun->unpacked_lun = i;
		lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
		atomic_set(&lun->lun_acl_count, 0);
		init_completion(&lun->lun_shutdown_comp);
		INIT_LIST_HEAD(&lun->lun_acl_list);
		INIT_LIST_HEAD(&lun->lun_cmd_list);
		spin_lock_init(&lun->lun_acl_lock);
		spin_lock_init(&lun->lun_cmd_lock);
		spin_lock_init(&lun->lun_sep_lock);
	}

	se_tpg->se_tpg_type = se_tpg_type;
	se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
	se_tpg->se_tpg_tfo = tfo;
	se_tpg->se_tpg_wwn = se_wwn;
	atomic_set(&se_tpg->tpg_pr_ref_count, 0);
	INIT_LIST_HEAD(&se_tpg->acl_node_list);
	INIT_LIST_HEAD(&se_tpg->se_tpg_node);
	INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
	spin_lock_init(&se_tpg->acl_node_lock);
	spin_lock_init(&se_tpg->session_lock);
	spin_lock_init(&se_tpg->tpg_lun_lock);

	if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
		if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
			kfree(se_tpg);
			return -ENOMEM;
		}
	}

	spin_lock_bh(&tpg_lock);
	list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
	spin_unlock_bh(&tpg_lock);

	printk(KERN_INFO "TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
		" endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
		(se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
		"Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
		"None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));

	return 0;
}
EXPORT_SYMBOL(core_tpg_register);

int core_tpg_deregister(struct se_portal_group *se_tpg)
{
	struct se_node_acl *nacl, *nacl_tmp;

	printk(KERN_INFO "TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
		" for endpoint: %s Portal Tag %u\n",
		(se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
		"Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
		se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
		se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));

	spin_lock_bh(&tpg_lock);
	list_del(&se_tpg->se_tpg_node);
	spin_unlock_bh(&tpg_lock);

	while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
		cpu_relax();
	/*
	 * Release any remaining demo-mode generated se_node_acl that have
	 * not been released because of TFO->tpg_check_demo_mode_cache() == 1
	 * in transport_deregister_session().
	 */
	spin_lock_bh(&se_tpg->acl_node_lock);
	list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
			acl_list) {
		list_del(&nacl->acl_list);
		se_tpg->num_node_acls--;
		spin_unlock_bh(&se_tpg->acl_node_lock);

		core_tpg_wait_for_nacl_pr_ref(nacl);
		core_free_device_list_for_node(nacl, se_tpg);
		se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);

		spin_lock_bh(&se_tpg->acl_node_lock);
	}
	spin_unlock_bh(&se_tpg->acl_node_lock);

	if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
		core_tpg_release_virtual_lun0(se_tpg);

	se_tpg->se_tpg_fabric_ptr = NULL;
	kfree(se_tpg->tpg_lun_list);
	return 0;
}
EXPORT_SYMBOL(core_tpg_deregister);

struct se_lun *core_tpg_pre_addlun(
	struct se_portal_group *tpg,
	u32 unpacked_lun)
{
	struct se_lun *lun;

	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
		printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
			"-1: %u for Target Portal Group: %u\n",
			tpg->se_tpg_tfo->get_fabric_name(),
			unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
		return ERR_PTR(-EOVERFLOW);
	}

	spin_lock(&tpg->tpg_lun_lock);
	lun = &tpg->tpg_lun_list[unpacked_lun];
	if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
		printk(KERN_ERR "TPG Logical Unit Number: %u is already active"
			" on %s Target Portal Group: %u, ignoring request.\n",
			unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
		spin_unlock(&tpg->tpg_lun_lock);
		return ERR_PTR(-EINVAL);
	}
	spin_unlock(&tpg->tpg_lun_lock);

	return lun;
}

int core_tpg_post_addlun(
	struct se_portal_group *tpg,
	struct se_lun *lun,
	u32 lun_access,
	void *lun_ptr)
{
	int ret;

	ret = core_dev_export(lun_ptr, tpg, lun);
	if (ret < 0)
		return ret;

	spin_lock(&tpg->tpg_lun_lock);
	lun->lun_access = lun_access;
	lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
	spin_unlock(&tpg->tpg_lun_lock);

	return 0;
}

static void core_tpg_shutdown_lun(
	struct se_portal_group *tpg,
	struct se_lun *lun)
{
	core_clear_lun_from_tpg(lun, tpg);
	transport_clear_lun_from_sessions(lun);
}

struct se_lun *core_tpg_pre_dellun(
	struct se_portal_group *tpg,
	u32 unpacked_lun,
	int *ret)
{
	struct se_lun *lun;

	if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
		printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
			"-1: %u for Target Portal Group: %u\n",
			tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
			TRANSPORT_MAX_LUNS_PER_TPG-1,
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
		return ERR_PTR(-EOVERFLOW);
	}

	spin_lock(&tpg->tpg_lun_lock);
	lun = &tpg->tpg_lun_list[unpacked_lun];
	if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
		printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
			" Target Portal Group: %u, ignoring request.\n",
			tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
			tpg->se_tpg_tfo->tpg_get_tag(tpg));
		spin_unlock(&tpg->tpg_lun_lock);
		return ERR_PTR(-ENODEV);
	}
	spin_unlock(&tpg->tpg_lun_lock);

	return lun;
}

int core_tpg_post_dellun(
	struct se_portal_group *tpg,
	struct se_lun *lun)
{
	core_tpg_shutdown_lun(tpg, lun);

	core_dev_unexport(lun->lun_se_dev, tpg, lun);

	spin_lock(&tpg->tpg_lun_lock);
	lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
	spin_unlock(&tpg->tpg_lun_lock);

	return 0;
}
OpenPOWER on IntegriCloud