summaryrefslogtreecommitdiffstats
path: root/drivers/target/target_core_device.c
blob: e8dd6da164b28550f42d4909afed480291cc29ab (plain) (blame)
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
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
/*******************************************************************************
 * Filename:  target_core_device.c (based on iscsi_target_device.c)
 *
 * This file contains the TCM Virtual Device and Disk Transport
 * agnostic related functions.
 *
 * (c) Copyright 2003-2013 Datera, Inc.
 *
 * 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/delay.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/kthread.h>
#include <linux/in.h>
#include <linux/export.h>
#include <linux/t10-pi.h>
#include <asm/unaligned.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi_common.h>
#include <scsi/scsi_proto.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>

#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"

static DEFINE_MUTEX(device_mutex);
static LIST_HEAD(device_list);
static DEFINE_IDR(devices_idr);

static struct se_hba *lun0_hba;
/* not static, needed by tpg.c */
struct se_device *g_lun0_dev;

sense_reason_t
transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
{
	struct se_lun *se_lun = NULL;
	struct se_session *se_sess = se_cmd->se_sess;
	struct se_node_acl *nacl = se_sess->se_node_acl;
	struct se_dev_entry *deve;
	sense_reason_t ret = TCM_NO_SENSE;

	rcu_read_lock();
	deve = target_nacl_find_deve(nacl, unpacked_lun);
	if (deve) {
		atomic_long_inc(&deve->total_cmds);

		if (se_cmd->data_direction == DMA_TO_DEVICE)
			atomic_long_add(se_cmd->data_length,
					&deve->write_bytes);
		else if (se_cmd->data_direction == DMA_FROM_DEVICE)
			atomic_long_add(se_cmd->data_length,
					&deve->read_bytes);

		se_lun = rcu_dereference(deve->se_lun);

		if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
			se_lun = NULL;
			goto out_unlock;
		}

		se_cmd->se_lun = rcu_dereference(deve->se_lun);
		se_cmd->pr_res_key = deve->pr_res_key;
		se_cmd->orig_fe_lun = unpacked_lun;
		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
		se_cmd->lun_ref_active = true;

		if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
		    deve->lun_access_ro) {
			pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
				" Access for 0x%08llx\n",
				se_cmd->se_tfo->get_fabric_name(),
				unpacked_lun);
			rcu_read_unlock();
			ret = TCM_WRITE_PROTECTED;
			goto ref_dev;
		}
	}
out_unlock:
	rcu_read_unlock();

	if (!se_lun) {
		/*
		 * Use the se_portal_group->tpg_virt_lun0 to allow for
		 * REPORT_LUNS, et al to be returned when no active
		 * MappedLUN=0 exists for this Initiator Port.
		 */
		if (unpacked_lun != 0) {
			pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
				" Access for 0x%08llx\n",
				se_cmd->se_tfo->get_fabric_name(),
				unpacked_lun);
			return TCM_NON_EXISTENT_LUN;
		}

		se_lun = se_sess->se_tpg->tpg_virt_lun0;
		se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
		se_cmd->orig_fe_lun = 0;
		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;

		percpu_ref_get(&se_lun->lun_ref);
		se_cmd->lun_ref_active = true;

		/*
		 * Force WRITE PROTECT for virtual LUN 0
		 */
		if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
		    (se_cmd->data_direction != DMA_NONE)) {
			ret = TCM_WRITE_PROTECTED;
			goto ref_dev;
		}
	}
	/*
	 * RCU reference protected by percpu se_lun->lun_ref taken above that
	 * must drop to zero (including initial reference) before this se_lun
	 * pointer can be kfree_rcu() by the final se_lun->lun_group put via
	 * target_core_fabric_configfs.c:target_fabric_port_release
	 */
ref_dev:
	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
	atomic_long_inc(&se_cmd->se_dev->num_cmds);

	if (se_cmd->data_direction == DMA_TO_DEVICE)
		atomic_long_add(se_cmd->data_length,
				&se_cmd->se_dev->write_bytes);
	else if (se_cmd->data_direction == DMA_FROM_DEVICE)
		atomic_long_add(se_cmd->data_length,
				&se_cmd->se_dev->read_bytes);

	return ret;
}
EXPORT_SYMBOL(transport_lookup_cmd_lun);

int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
{
	struct se_dev_entry *deve;
	struct se_lun *se_lun = NULL;
	struct se_session *se_sess = se_cmd->se_sess;
	struct se_node_acl *nacl = se_sess->se_node_acl;
	struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
	unsigned long flags;

	rcu_read_lock();
	deve = target_nacl_find_deve(nacl, unpacked_lun);
	if (deve) {
		se_lun = rcu_dereference(deve->se_lun);

		if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
			se_lun = NULL;
			goto out_unlock;
		}

		se_cmd->se_lun = rcu_dereference(deve->se_lun);
		se_cmd->pr_res_key = deve->pr_res_key;
		se_cmd->orig_fe_lun = unpacked_lun;
		se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
		se_cmd->lun_ref_active = true;
	}
out_unlock:
	rcu_read_unlock();

	if (!se_lun) {
		pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
			" Access for 0x%08llx\n",
			se_cmd->se_tfo->get_fabric_name(),
			unpacked_lun);
		return -ENODEV;
	}
	se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
	se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);

	spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
	list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
	spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);

	return 0;
}
EXPORT_SYMBOL(transport_lookup_tmr_lun);

bool target_lun_is_rdonly(struct se_cmd *cmd)
{
	struct se_session *se_sess = cmd->se_sess;
	struct se_dev_entry *deve;
	bool ret;

	rcu_read_lock();
	deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
	ret = deve && deve->lun_access_ro;
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(target_lun_is_rdonly);

/*
 * This function is called from core_scsi3_emulate_pro_register_and_move()
 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
 * when a matching rtpi is found.
 */
struct se_dev_entry *core_get_se_deve_from_rtpi(
	struct se_node_acl *nacl,
	u16 rtpi)
{
	struct se_dev_entry *deve;
	struct se_lun *lun;
	struct se_portal_group *tpg = nacl->se_tpg;

	rcu_read_lock();
	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
		lun = rcu_dereference(deve->se_lun);
		if (!lun) {
			pr_err("%s device entries device pointer is"
				" NULL, but Initiator has access.\n",
				tpg->se_tpg_tfo->get_fabric_name());
			continue;
		}
		if (lun->lun_rtpi != rtpi)
			continue;

		kref_get(&deve->pr_kref);
		rcu_read_unlock();

		return deve;
	}
	rcu_read_unlock();

	return NULL;
}

void core_free_device_list_for_node(
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	struct se_dev_entry *deve;

	mutex_lock(&nacl->lun_entry_mutex);
	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
		struct se_lun *lun = rcu_dereference_check(deve->se_lun,
					lockdep_is_held(&nacl->lun_entry_mutex));
		core_disable_device_list_for_node(lun, deve, nacl, tpg);
	}
	mutex_unlock(&nacl->lun_entry_mutex);
}

void core_update_device_list_access(
	u64 mapped_lun,
	bool lun_access_ro,
	struct se_node_acl *nacl)
{
	struct se_dev_entry *deve;

	mutex_lock(&nacl->lun_entry_mutex);
	deve = target_nacl_find_deve(nacl, mapped_lun);
	if (deve)
		deve->lun_access_ro = lun_access_ro;
	mutex_unlock(&nacl->lun_entry_mutex);
}

/*
 * Called with rcu_read_lock or nacl->device_list_lock held.
 */
struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
{
	struct se_dev_entry *deve;

	hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
		if (deve->mapped_lun == mapped_lun)
			return deve;

	return NULL;
}
EXPORT_SYMBOL(target_nacl_find_deve);

void target_pr_kref_release(struct kref *kref)
{
	struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
						 pr_kref);
	complete(&deve->pr_comp);
}

static void
target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
			     bool skip_new)
{
	struct se_dev_entry *tmp;

	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
		if (skip_new && tmp == new)
			continue;
		core_scsi3_ua_allocate(tmp, 0x3F,
				       ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
	}
	rcu_read_unlock();
}

int core_enable_device_list_for_node(
	struct se_lun *lun,
	struct se_lun_acl *lun_acl,
	u64 mapped_lun,
	bool lun_access_ro,
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	struct se_dev_entry *orig, *new;

	new = kzalloc(sizeof(*new), GFP_KERNEL);
	if (!new) {
		pr_err("Unable to allocate se_dev_entry memory\n");
		return -ENOMEM;
	}

	atomic_set(&new->ua_count, 0);
	spin_lock_init(&new->ua_lock);
	INIT_LIST_HEAD(&new->ua_list);
	INIT_LIST_HEAD(&new->lun_link);

	new->mapped_lun = mapped_lun;
	kref_init(&new->pr_kref);
	init_completion(&new->pr_comp);

	new->lun_access_ro = lun_access_ro;
	new->creation_time = get_jiffies_64();
	new->attach_count++;

	mutex_lock(&nacl->lun_entry_mutex);
	orig = target_nacl_find_deve(nacl, mapped_lun);
	if (orig && orig->se_lun) {
		struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
					lockdep_is_held(&nacl->lun_entry_mutex));

		if (orig_lun != lun) {
			pr_err("Existing orig->se_lun doesn't match new lun"
			       " for dynamic -> explicit NodeACL conversion:"
				" %s\n", nacl->initiatorname);
			mutex_unlock(&nacl->lun_entry_mutex);
			kfree(new);
			return -EINVAL;
		}
		if (orig->se_lun_acl != NULL) {
			pr_warn_ratelimited("Detected existing explicit"
				" se_lun_acl->se_lun_group reference for %s"
				" mapped_lun: %llu, failing\n",
				 nacl->initiatorname, mapped_lun);
			mutex_unlock(&nacl->lun_entry_mutex);
			kfree(new);
			return -EINVAL;
		}

		rcu_assign_pointer(new->se_lun, lun);
		rcu_assign_pointer(new->se_lun_acl, lun_acl);
		hlist_del_rcu(&orig->link);
		hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
		mutex_unlock(&nacl->lun_entry_mutex);

		spin_lock(&lun->lun_deve_lock);
		list_del(&orig->lun_link);
		list_add_tail(&new->lun_link, &lun->lun_deve_list);
		spin_unlock(&lun->lun_deve_lock);

		kref_put(&orig->pr_kref, target_pr_kref_release);
		wait_for_completion(&orig->pr_comp);

		target_luns_data_has_changed(nacl, new, true);
		kfree_rcu(orig, rcu_head);
		return 0;
	}

	rcu_assign_pointer(new->se_lun, lun);
	rcu_assign_pointer(new->se_lun_acl, lun_acl);
	hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
	mutex_unlock(&nacl->lun_entry_mutex);

	spin_lock(&lun->lun_deve_lock);
	list_add_tail(&new->lun_link, &lun->lun_deve_list);
	spin_unlock(&lun->lun_deve_lock);

	target_luns_data_has_changed(nacl, new, true);
	return 0;
}

/*
 *	Called with se_node_acl->lun_entry_mutex held.
 */
void core_disable_device_list_for_node(
	struct se_lun *lun,
	struct se_dev_entry *orig,
	struct se_node_acl *nacl,
	struct se_portal_group *tpg)
{
	/*
	 * rcu_dereference_raw protected by se_lun->lun_group symlink
	 * reference to se_device->dev_group.
	 */
	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
	/*
	 * If the MappedLUN entry is being disabled, the entry in
	 * lun->lun_deve_list must be removed now before clearing the
	 * struct se_dev_entry pointers below as logic in
	 * core_alua_do_transition_tg_pt() depends on these being present.
	 *
	 * deve->se_lun_acl will be NULL for demo-mode created LUNs
	 * that have not been explicitly converted to MappedLUNs ->
	 * struct se_lun_acl, but we remove deve->lun_link from
	 * lun->lun_deve_list. This also means that active UAs and
	 * NodeACL context specific PR metadata for demo-mode
	 * MappedLUN *deve will be released below..
	 */
	spin_lock(&lun->lun_deve_lock);
	list_del(&orig->lun_link);
	spin_unlock(&lun->lun_deve_lock);
	/*
	 * Disable struct se_dev_entry LUN ACL mapping
	 */
	core_scsi3_ua_release_all(orig);

	hlist_del_rcu(&orig->link);
	clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
	orig->lun_access_ro = false;
	orig->creation_time = 0;
	orig->attach_count--;
	/*
	 * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
	 * or REGISTER_AND_MOVE PR operation to complete.
	 */
	kref_put(&orig->pr_kref, target_pr_kref_release);
	wait_for_completion(&orig->pr_comp);

	rcu_assign_pointer(orig->se_lun, NULL);
	rcu_assign_pointer(orig->se_lun_acl, NULL);

	kfree_rcu(orig, rcu_head);

	core_scsi3_free_pr_reg_from_nacl(dev, nacl);
	target_luns_data_has_changed(nacl, NULL, false);
}

/*      core_clear_lun_from_tpg():
 *
 *
 */
void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
{
	struct se_node_acl *nacl;
	struct se_dev_entry *deve;

	mutex_lock(&tpg->acl_node_mutex);
	list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {

		mutex_lock(&nacl->lun_entry_mutex);
		hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
			struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
					lockdep_is_held(&nacl->lun_entry_mutex));

			if (lun != tmp_lun)
				continue;

			core_disable_device_list_for_node(lun, deve, nacl, tpg);
		}
		mutex_unlock(&nacl->lun_entry_mutex);
	}
	mutex_unlock(&tpg->acl_node_mutex);
}

int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
{
	struct se_lun *tmp;

	spin_lock(&dev->se_port_lock);
	if (dev->export_count == 0x0000ffff) {
		pr_warn("Reached dev->dev_port_count =="
				" 0x0000ffff\n");
		spin_unlock(&dev->se_port_lock);
		return -ENOSPC;
	}
again:
	/*
	 * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
	 * Here is the table from spc4r17 section 7.7.3.8.
	 *
	 *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
	 *
	 * Code      Description
	 * 0h        Reserved
	 * 1h        Relative port 1, historically known as port A
	 * 2h        Relative port 2, historically known as port B
	 * 3h to FFFFh    Relative port 3 through 65 535
	 */
	lun->lun_rtpi = dev->dev_rpti_counter++;
	if (!lun->lun_rtpi)
		goto again;

	list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
		/*
		 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
		 * for 16-bit wrap..
		 */
		if (lun->lun_rtpi == tmp->lun_rtpi)
			goto again;
	}
	spin_unlock(&dev->se_port_lock);

	return 0;
}

static void se_release_vpd_for_dev(struct se_device *dev)
{
	struct t10_vpd *vpd, *vpd_tmp;

	spin_lock(&dev->t10_wwn.t10_vpd_lock);
	list_for_each_entry_safe(vpd, vpd_tmp,
			&dev->t10_wwn.t10_vpd_list, vpd_list) {
		list_del(&vpd->vpd_list);
		kfree(vpd);
	}
	spin_unlock(&dev->t10_wwn.t10_vpd_lock);
}

static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
{
	u32 aligned_max_sectors;
	u32 alignment;
	/*
	 * Limit max_sectors to a PAGE_SIZE aligned value for modern
	 * transport_allocate_data_tasks() operation.
	 */
	alignment = max(1ul, PAGE_SIZE / block_size);
	aligned_max_sectors = rounddown(max_sectors, alignment);

	if (max_sectors != aligned_max_sectors)
		pr_info("Rounding down aligned max_sectors from %u to %u\n",
			max_sectors, aligned_max_sectors);

	return aligned_max_sectors;
}

int core_dev_add_lun(
	struct se_portal_group *tpg,
	struct se_device *dev,
	struct se_lun *lun)
{
	int rc;

	rc = core_tpg_add_lun(tpg, lun, false, dev);
	if (rc < 0)
		return rc;

	pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
		" CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
		tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
	/*
	 * Update LUN maps for dynamically added initiators when
	 * generate_node_acl is enabled.
	 */
	if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
		struct se_node_acl *acl;

		mutex_lock(&tpg->acl_node_mutex);
		list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
			if (acl->dynamic_node_acl &&
			    (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
			     !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
				core_tpg_add_node_to_devs(acl, tpg, lun);
			}
		}
		mutex_unlock(&tpg->acl_node_mutex);
	}

	return 0;
}

/*      core_dev_del_lun():
 *
 *
 */
void core_dev_del_lun(
	struct se_portal_group *tpg,
	struct se_lun *lun)
{
	pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
		" device object\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
		tpg->se_tpg_tfo->get_fabric_name());

	core_tpg_remove_lun(tpg, lun);
}

struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_node_acl *nacl,
	u64 mapped_lun,
	int *ret)
{
	struct se_lun_acl *lacl;

	if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
		pr_err("%s InitiatorName exceeds maximum size.\n",
			tpg->se_tpg_tfo->get_fabric_name());
		*ret = -EOVERFLOW;
		return NULL;
	}
	lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
	if (!lacl) {
		pr_err("Unable to allocate memory for struct se_lun_acl.\n");
		*ret = -ENOMEM;
		return NULL;
	}

	lacl->mapped_lun = mapped_lun;
	lacl->se_lun_nacl = nacl;

	return lacl;
}

int core_dev_add_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_lun_acl *lacl,
	struct se_lun *lun,
	bool lun_access_ro)
{
	struct se_node_acl *nacl = lacl->se_lun_nacl;
	/*
	 * rcu_dereference_raw protected by se_lun->lun_group symlink
	 * reference to se_device->dev_group.
	 */
	struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);

	if (!nacl)
		return -EINVAL;

	if (lun->lun_access_ro)
		lun_access_ro = true;

	lacl->se_lun = lun;

	if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
			lun_access_ro, nacl, tpg) < 0)
		return -EINVAL;

	pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
		" InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
		lun_access_ro ? "RO" : "RW",
		nacl->initiatorname);
	/*
	 * Check to see if there are any existing persistent reservation APTPL
	 * pre-registrations that need to be enabled for this LUN ACL..
	 */
	core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
					    lacl->mapped_lun);
	return 0;
}

int core_dev_del_initiator_node_lun_acl(
	struct se_lun *lun,
	struct se_lun_acl *lacl)
{
	struct se_portal_group *tpg = lun->lun_tpg;
	struct se_node_acl *nacl;
	struct se_dev_entry *deve;

	nacl = lacl->se_lun_nacl;
	if (!nacl)
		return -EINVAL;

	mutex_lock(&nacl->lun_entry_mutex);
	deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
	if (deve)
		core_disable_device_list_for_node(lun, deve, nacl, tpg);
	mutex_unlock(&nacl->lun_entry_mutex);

	pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
		" InitiatorNode: %s Mapped LUN: %llu\n",
		tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
		nacl->initiatorname, lacl->mapped_lun);

	return 0;
}

void core_dev_free_initiator_node_lun_acl(
	struct se_portal_group *tpg,
	struct se_lun_acl *lacl)
{
	pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
		" Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
		tpg->se_tpg_tfo->tpg_get_tag(tpg),
		tpg->se_tpg_tfo->get_fabric_name(),
		lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);

	kfree(lacl);
}

static void scsi_dump_inquiry(struct se_device *dev)
{
	struct t10_wwn *wwn = &dev->t10_wwn;
	char buf[17];
	int i, device_type;
	/*
	 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
	 */
	for (i = 0; i < 8; i++)
		if (wwn->vendor[i] >= 0x20)
			buf[i] = wwn->vendor[i];
		else
			buf[i] = ' ';
	buf[i] = '\0';
	pr_debug("  Vendor: %s\n", buf);

	for (i = 0; i < 16; i++)
		if (wwn->model[i] >= 0x20)
			buf[i] = wwn->model[i];
		else
			buf[i] = ' ';
	buf[i] = '\0';
	pr_debug("  Model: %s\n", buf);

	for (i = 0; i < 4; i++)
		if (wwn->revision[i] >= 0x20)
			buf[i] = wwn->revision[i];
		else
			buf[i] = ' ';
	buf[i] = '\0';
	pr_debug("  Revision: %s\n", buf);

	device_type = dev->transport->get_device_type(dev);
	pr_debug("  Type:   %s ", scsi_device_type(device_type));
}

struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
{
	struct se_device *dev;
	struct se_lun *xcopy_lun;

	dev = hba->backend->ops->alloc_device(hba, name);
	if (!dev)
		return NULL;

	dev->se_hba = hba;
	dev->transport = hba->backend->ops;
	dev->prot_length = sizeof(struct t10_pi_tuple);
	dev->hba_index = hba->hba_index;

	INIT_LIST_HEAD(&dev->dev_sep_list);
	INIT_LIST_HEAD(&dev->dev_tmr_list);
	INIT_LIST_HEAD(&dev->delayed_cmd_list);
	INIT_LIST_HEAD(&dev->state_list);
	INIT_LIST_HEAD(&dev->qf_cmd_list);
	spin_lock_init(&dev->execute_task_lock);
	spin_lock_init(&dev->delayed_cmd_lock);
	spin_lock_init(&dev->dev_reservation_lock);
	spin_lock_init(&dev->se_port_lock);
	spin_lock_init(&dev->se_tmr_lock);
	spin_lock_init(&dev->qf_cmd_lock);
	sema_init(&dev->caw_sem, 1);
	INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
	spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
	INIT_LIST_HEAD(&dev->t10_pr.registration_list);
	INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
	spin_lock_init(&dev->t10_pr.registration_lock);
	spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
	INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
	spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
	INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
	spin_lock_init(&dev->t10_alua.lba_map_lock);

	dev->t10_wwn.t10_dev = dev;
	dev->t10_alua.t10_dev = dev;

	dev->dev_attrib.da_dev = dev;
	dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
	dev->dev_attrib.emulate_dpo = 1;
	dev->dev_attrib.emulate_fua_write = 1;
	dev->dev_attrib.emulate_fua_read = 1;
	dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
	dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
	dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
	dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
	dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
	dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
	dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
	dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
	dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
	dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
	dev->dev_attrib.is_nonrot = DA_IS_NONROT;
	dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
	dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
	dev->dev_attrib.max_unmap_block_desc_count =
		DA_MAX_UNMAP_BLOCK_DESC_COUNT;
	dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
	dev->dev_attrib.unmap_granularity_alignment =
				DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
	dev->dev_attrib.unmap_zeroes_data =
				DA_UNMAP_ZEROES_DATA_DEFAULT;
	dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;

	xcopy_lun = &dev->xcopy_lun;
	rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
	init_completion(&xcopy_lun->lun_ref_comp);
	init_completion(&xcopy_lun->lun_shutdown_comp);
	INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
	INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
	mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
	xcopy_lun->lun_tpg = &xcopy_pt_tpg;

	return dev;
}

/*
 * Check if the underlying struct block_device request_queue supports
 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
 * in ATA and we need to set TPE=1
 */
bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
				       struct request_queue *q)
{
	int block_size = queue_logical_block_size(q);

	if (!blk_queue_discard(q))
		return false;

	attrib->max_unmap_lba_count =
		q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
	/*
	 * Currently hardcoded to 1 in Linux/SCSI code..
	 */
	attrib->max_unmap_block_desc_count = 1;
	attrib->unmap_granularity = q->limits.discard_granularity / block_size;
	attrib->unmap_granularity_alignment = q->limits.discard_alignment /
								block_size;
	attrib->unmap_zeroes_data = (q->limits.max_write_zeroes_sectors);
	return true;
}
EXPORT_SYMBOL(target_configure_unmap_from_queue);

/*
 * Convert from blocksize advertised to the initiator to the 512 byte
 * units unconditionally used by the Linux block layer.
 */
sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
{
	switch (dev->dev_attrib.block_size) {
	case 4096:
		return lb << 3;
	case 2048:
		return lb << 2;
	case 1024:
		return lb << 1;
	default:
		return lb;
	}
}
EXPORT_SYMBOL(target_to_linux_sector);

/**
 * target_find_device - find a se_device by its dev_index
 * @id: dev_index
 * @do_depend: true if caller needs target_depend_item to be done
 *
 * If do_depend is true, the caller must do a target_undepend_item
 * when finished using the device.
 *
 * If do_depend is false, the caller must be called in a configfs
 * callback or during removal.
 */
struct se_device *target_find_device(int id, bool do_depend)
{
	struct se_device *dev;

	mutex_lock(&device_mutex);
	dev = idr_find(&devices_idr, id);
	if (dev && do_depend && target_depend_item(&dev->dev_group.cg_item))
		dev = NULL;
	mutex_unlock(&device_mutex);
	return dev;
}
EXPORT_SYMBOL(target_find_device);

struct devices_idr_iter {
	int (*fn)(struct se_device *dev, void *data);
	void *data;
};

static int target_devices_idr_iter(int id, void *p, void *data)
{
	struct devices_idr_iter *iter = data;
	struct se_device *dev = p;

	/*
	 * We add the device early to the idr, so it can be used
	 * by backend modules during configuration. We do not want
	 * to allow other callers to access partially setup devices,
	 * so we skip them here.
	 */
	if (!(dev->dev_flags & DF_CONFIGURED))
		return 0;

	return iter->fn(dev, iter->data);
}

/**
 * target_for_each_device - iterate over configured devices
 * @fn: iterator function
 * @data: pointer to data that will be passed to fn
 *
 * fn must return 0 to continue looping over devices. non-zero will break
 * from the loop and return that value to the caller.
 */
int target_for_each_device(int (*fn)(struct se_device *dev, void *data),
			   void *data)
{
	struct devices_idr_iter iter;
	int ret;

	iter.fn = fn;
	iter.data = data;

	mutex_lock(&device_mutex);
	ret = idr_for_each(&devices_idr, target_devices_idr_iter, &iter);
	mutex_unlock(&device_mutex);
	return ret;
}

int target_configure_device(struct se_device *dev)
{
	struct se_hba *hba = dev->se_hba;
	int ret, id;

	if (dev->dev_flags & DF_CONFIGURED) {
		pr_err("se_dev->se_dev_ptr already set for storage"
				" object\n");
		return -EEXIST;
	}

	/*
	 * Add early so modules like tcmu can use during its
	 * configuration.
	 */
	mutex_lock(&device_mutex);
	/*
	 * Use cyclic to try and avoid collisions with devices
	 * that were recently removed.
	 */
	id = idr_alloc_cyclic(&devices_idr, dev, 0, INT_MAX, GFP_KERNEL);
	mutex_unlock(&device_mutex);
	if (id < 0) {
		ret = -ENOMEM;
		goto out;
	}
	dev->dev_index = id;

	ret = dev->transport->configure_device(dev);
	if (ret)
		goto out_free_index;
	/*
	 * XXX: there is not much point to have two different values here..
	 */
	dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
	dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;

	/*
	 * Align max_hw_sectors down to PAGE_SIZE I/O transfers
	 */
	dev->dev_attrib.hw_max_sectors =
		se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
					 dev->dev_attrib.hw_block_size);
	dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;

	dev->creation_time = get_jiffies_64();

	ret = core_setup_alua(dev);
	if (ret)
		goto out_free_index;

	/*
	 * Startup the struct se_device processing thread
	 */
	dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
				      dev->transport->name);
	if (!dev->tmr_wq) {
		pr_err("Unable to create tmr workqueue for %s\n",
			dev->transport->name);
		ret = -ENOMEM;
		goto out_free_alua;
	}

	/*
	 * Setup work_queue for QUEUE_FULL
	 */
	INIT_WORK(&dev->qf_work_queue, target_qf_do_work);

	/*
	 * Preload the initial INQUIRY const values if we are doing
	 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
	 * passthrough because this is being provided by the backend LLD.
	 */
	if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
		strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
		strncpy(&dev->t10_wwn.model[0],
			dev->transport->inquiry_prod, 16);
		strncpy(&dev->t10_wwn.revision[0],
			dev->transport->inquiry_rev, 4);
	}

	scsi_dump_inquiry(dev);

	spin_lock(&hba->device_lock);
	hba->dev_count++;
	spin_unlock(&hba->device_lock);

	dev->dev_flags |= DF_CONFIGURED;

	return 0;

out_free_alua:
	core_alua_free_lu_gp_mem(dev);
out_free_index:
	mutex_lock(&device_mutex);
	idr_remove(&devices_idr, dev->dev_index);
	mutex_unlock(&device_mutex);
out:
	se_release_vpd_for_dev(dev);
	return ret;
}

void target_free_device(struct se_device *dev)
{
	struct se_hba *hba = dev->se_hba;

	WARN_ON(!list_empty(&dev->dev_sep_list));

	if (dev->dev_flags & DF_CONFIGURED) {
		destroy_workqueue(dev->tmr_wq);

		dev->transport->destroy_device(dev);

		mutex_lock(&device_mutex);
		idr_remove(&devices_idr, dev->dev_index);
		mutex_unlock(&device_mutex);

		spin_lock(&hba->device_lock);
		hba->dev_count--;
		spin_unlock(&hba->device_lock);
	}

	core_alua_free_lu_gp_mem(dev);
	core_alua_set_lba_map(dev, NULL, 0, 0);
	core_scsi3_free_all_registrations(dev);
	se_release_vpd_for_dev(dev);

	if (dev->transport->free_prot)
		dev->transport->free_prot(dev);

	dev->transport->free_device(dev);
}

int core_dev_setup_virtual_lun0(void)
{
	struct se_hba *hba;
	struct se_device *dev;
	char buf[] = "rd_pages=8,rd_nullio=1";
	int ret;

	hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
	if (IS_ERR(hba))
		return PTR_ERR(hba);

	dev = target_alloc_device(hba, "virt_lun0");
	if (!dev) {
		ret = -ENOMEM;
		goto out_free_hba;
	}

	hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));

	ret = target_configure_device(dev);
	if (ret)
		goto out_free_se_dev;

	lun0_hba = hba;
	g_lun0_dev = dev;
	return 0;

out_free_se_dev:
	target_free_device(dev);
out_free_hba:
	core_delete_hba(hba);
	return ret;
}


void core_dev_release_virtual_lun0(void)
{
	struct se_hba *hba = lun0_hba;

	if (!hba)
		return;

	if (g_lun0_dev)
		target_free_device(g_lun0_dev);
	core_delete_hba(hba);
}

/*
 * Common CDB parsing for kernel and user passthrough.
 */
sense_reason_t
passthrough_parse_cdb(struct se_cmd *cmd,
	sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
{
	unsigned char *cdb = cmd->t_task_cdb;
	struct se_device *dev = cmd->se_dev;
	unsigned int size;

	/*
	 * Clear a lun set in the cdb if the initiator talking to use spoke
	 * and old standards version, as we can't assume the underlying device
	 * won't choke up on it.
	 */
	switch (cdb[0]) {
	case READ_10: /* SBC - RDProtect */
	case READ_12: /* SBC - RDProtect */
	case READ_16: /* SBC - RDProtect */
	case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
	case VERIFY: /* SBC - VRProtect */
	case VERIFY_16: /* SBC - VRProtect */
	case WRITE_VERIFY: /* SBC - VRProtect */
	case WRITE_VERIFY_12: /* SBC - VRProtect */
	case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
		break;
	default:
		cdb[1] &= 0x1f; /* clear logical unit number */
		break;
	}

	/*
	 * For REPORT LUNS we always need to emulate the response, for everything
	 * else, pass it up.
	 */
	if (cdb[0] == REPORT_LUNS) {
		cmd->execute_cmd = spc_emulate_report_luns;
		return TCM_NO_SENSE;
	}

	/*
	 * For PERSISTENT RESERVE IN/OUT, RELEASE, and RESERVE we need to
	 * emulate the response, since tcmu does not have the information
	 * required to process these commands.
	 */
	if (!(dev->transport->transport_flags &
	      TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
		if (cdb[0] == PERSISTENT_RESERVE_IN) {
			cmd->execute_cmd = target_scsi3_emulate_pr_in;
			size = get_unaligned_be16(&cdb[7]);
			return target_cmd_size_check(cmd, size);
		}
		if (cdb[0] == PERSISTENT_RESERVE_OUT) {
			cmd->execute_cmd = target_scsi3_emulate_pr_out;
			size = get_unaligned_be32(&cdb[5]);
			return target_cmd_size_check(cmd, size);
		}

		if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
			cmd->execute_cmd = target_scsi2_reservation_release;
			if (cdb[0] == RELEASE_10)
				size = get_unaligned_be16(&cdb[7]);
			else
				size = cmd->data_length;
			return target_cmd_size_check(cmd, size);
		}
		if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
			cmd->execute_cmd = target_scsi2_reservation_reserve;
			if (cdb[0] == RESERVE_10)
				size = get_unaligned_be16(&cdb[7]);
			else
				size = cmd->data_length;
			return target_cmd_size_check(cmd, size);
		}
	}

	/* Set DATA_CDB flag for ops that should have it */
	switch (cdb[0]) {
	case READ_6:
	case READ_10:
	case READ_12:
	case READ_16:
	case WRITE_6:
	case WRITE_10:
	case WRITE_12:
	case WRITE_16:
	case WRITE_VERIFY:
	case WRITE_VERIFY_12:
	case WRITE_VERIFY_16:
	case COMPARE_AND_WRITE:
	case XDWRITEREAD_10:
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		break;
	case VARIABLE_LENGTH_CMD:
		switch (get_unaligned_be16(&cdb[8])) {
		case READ_32:
		case WRITE_32:
		case WRITE_VERIFY_32:
		case XDWRITEREAD_32:
			cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
			break;
		}
	}

	cmd->execute_cmd = exec_cmd;

	return TCM_NO_SENSE;
}
EXPORT_SYMBOL(passthrough_parse_cdb);