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25
26#include <linux/slab.h>
27#include <linux/spinlock.h>
28#include <linux/configfs.h>
29#include <linux/export.h>
30#include <linux/file.h>
31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33#include <asm/unaligned.h>
34
35#include <target/target_core_base.h>
36#include <target/target_core_backend.h>
37#include <target/target_core_fabric.h>
38#include <target/target_core_configfs.h>
39
40#include "target_core_internal.h"
41#include "target_core_alua.h"
42#include "target_core_ua.h"
43
44static sense_reason_t core_alua_check_transition(int state, int *primary);
45static int core_alua_set_tg_pt_secondary_state(
46 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
47 struct se_port *port, int explict, int offline);
48
49static u16 alua_lu_gps_counter;
50static u32 alua_lu_gps_count;
51
52static DEFINE_SPINLOCK(lu_gps_lock);
53static LIST_HEAD(lu_gps_list);
54
55struct t10_alua_lu_gp *default_lu_gp;
56
57
58
59
60
61
62sense_reason_t
63target_emulate_report_target_port_groups(struct se_cmd *cmd)
64{
65 struct se_device *dev = cmd->se_dev;
66 struct se_port *port;
67 struct t10_alua_tg_pt_gp *tg_pt_gp;
68 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
69 unsigned char *buf;
70 u32 rd_len = 0, off;
71 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
72
73
74
75
76
77 if (ext_hdr != 0)
78 off = 8;
79 else
80 off = 4;
81
82 if (cmd->data_length < off) {
83 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
84 " small for %s header\n", cmd->data_length,
85 (ext_hdr) ? "extended" : "normal");
86 return TCM_INVALID_CDB_FIELD;
87 }
88 buf = transport_kmap_data_sg(cmd);
89 if (!buf)
90 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
91
92 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
93 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
94 tg_pt_gp_list) {
95
96
97
98
99
100
101 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
102 cmd->data_length) {
103 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
104 continue;
105 }
106
107
108
109
110 if (tg_pt_gp->tg_pt_gp_pref)
111 buf[off] = 0x80;
112
113
114
115 buf[off++] |= (atomic_read(
116 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
117
118
119
120 buf[off] = 0x80;
121 buf[off] |= 0x40;
122 buf[off] |= 0x8;
123 buf[off] |= 0x4;
124 buf[off] |= 0x2;
125 buf[off++] |= 0x1;
126
127
128
129 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
130 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
131
132 off++;
133
134
135
136 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
137
138
139
140 buf[off++] = 0x00;
141
142
143
144 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
145 rd_len += 8;
146
147 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
148 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
149 tg_pt_gp_mem_list) {
150 port = tg_pt_gp_mem->tg_pt;
151
152
153
154
155
156 off += 2;
157
158
159
160 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
161 buf[off++] = (port->sep_rtpi & 0xff);
162 rd_len += 4;
163 }
164 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
165 }
166 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
167
168
169
170 put_unaligned_be32(rd_len, &buf[0]);
171
172
173
174
175 if (ext_hdr != 0) {
176 buf[4] = 0x10;
177
178
179
180
181
182
183
184
185 port = cmd->se_lun->lun_sep;
186 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
187 if (tg_pt_gp_mem) {
188 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
189 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
190 if (tg_pt_gp)
191 buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs;
192 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
193 }
194 }
195 transport_kunmap_data_sg(cmd);
196
197 target_complete_cmd(cmd, GOOD);
198 return 0;
199}
200
201
202
203
204
205
206sense_reason_t
207target_emulate_set_target_port_groups(struct se_cmd *cmd)
208{
209 struct se_device *dev = cmd->se_dev;
210 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
211 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
212 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
213 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
214 unsigned char *buf;
215 unsigned char *ptr;
216 sense_reason_t rc = TCM_NO_SENSE;
217 u32 len = 4;
218 int alua_access_state, primary = 0;
219 u16 tg_pt_id, rtpi;
220
221 if (!l_port)
222 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
223
224 if (cmd->data_length < 4) {
225 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
226 " small\n", cmd->data_length);
227 return TCM_INVALID_PARAMETER_LIST;
228 }
229
230 buf = transport_kmap_data_sg(cmd);
231 if (!buf)
232 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
233
234
235
236
237
238 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
239 if (!l_tg_pt_gp_mem) {
240 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
241 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
242 goto out;
243 }
244 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
245 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
246 if (!l_tg_pt_gp) {
247 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
248 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
249 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
250 goto out;
251 }
252 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
253
254 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) {
255 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
256 " while TPGS_EXPLICT_ALUA is disabled\n");
257 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
258 goto out;
259 }
260
261 ptr = &buf[4];
262
263 while (len < cmd->data_length) {
264 bool found = false;
265 alua_access_state = (ptr[0] & 0x0f);
266
267
268
269
270
271 rc = core_alua_check_transition(alua_access_state, &primary);
272 if (rc) {
273
274
275
276
277
278
279
280
281
282
283 goto out;
284 }
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299 if (primary) {
300 tg_pt_id = get_unaligned_be16(ptr + 2);
301
302
303
304
305 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
306 list_for_each_entry(tg_pt_gp,
307 &dev->t10_alua.tg_pt_gps_list,
308 tg_pt_gp_list) {
309 if (!tg_pt_gp->tg_pt_gp_valid_id)
310 continue;
311
312 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
313 continue;
314
315 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
316 smp_mb__after_atomic_inc();
317
318 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
319
320 if (!core_alua_do_port_transition(tg_pt_gp,
321 dev, l_port, nacl,
322 alua_access_state, 1))
323 found = true;
324
325 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
326 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
327 smp_mb__after_atomic_dec();
328 break;
329 }
330 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
331 } else {
332
333
334
335
336
337 rtpi = get_unaligned_be16(ptr + 2);
338
339
340
341
342 spin_lock(&dev->se_port_lock);
343 list_for_each_entry(port, &dev->dev_sep_list,
344 sep_list) {
345 if (port->sep_rtpi != rtpi)
346 continue;
347
348 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
349
350 spin_unlock(&dev->se_port_lock);
351
352 if (!core_alua_set_tg_pt_secondary_state(
353 tg_pt_gp_mem, port, 1, 1))
354 found = true;
355
356 spin_lock(&dev->se_port_lock);
357 break;
358 }
359 spin_unlock(&dev->se_port_lock);
360 }
361
362 if (!found) {
363 rc = TCM_INVALID_PARAMETER_LIST;
364 goto out;
365 }
366
367 ptr += 4;
368 len += 4;
369 }
370
371out:
372 transport_kunmap_data_sg(cmd);
373 if (!rc)
374 target_complete_cmd(cmd, GOOD);
375 return rc;
376}
377
378static inline int core_alua_state_nonoptimized(
379 struct se_cmd *cmd,
380 unsigned char *cdb,
381 int nonop_delay_msecs,
382 u8 *alua_ascq)
383{
384
385
386
387
388
389 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
390 cmd->alua_nonop_delay = nonop_delay_msecs;
391 return 0;
392}
393
394static inline int core_alua_state_standby(
395 struct se_cmd *cmd,
396 unsigned char *cdb,
397 u8 *alua_ascq)
398{
399
400
401
402
403 switch (cdb[0]) {
404 case INQUIRY:
405 case LOG_SELECT:
406 case LOG_SENSE:
407 case MODE_SELECT:
408 case MODE_SENSE:
409 case REPORT_LUNS:
410 case RECEIVE_DIAGNOSTIC:
411 case SEND_DIAGNOSTIC:
412 return 0;
413 case MAINTENANCE_IN:
414 switch (cdb[1] & 0x1f) {
415 case MI_REPORT_TARGET_PGS:
416 return 0;
417 default:
418 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
419 return 1;
420 }
421 case MAINTENANCE_OUT:
422 switch (cdb[1]) {
423 case MO_SET_TARGET_PGS:
424 return 0;
425 default:
426 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
427 return 1;
428 }
429 case REQUEST_SENSE:
430 case PERSISTENT_RESERVE_IN:
431 case PERSISTENT_RESERVE_OUT:
432 case READ_BUFFER:
433 case WRITE_BUFFER:
434 return 0;
435 default:
436 *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
437 return 1;
438 }
439
440 return 0;
441}
442
443static inline int core_alua_state_unavailable(
444 struct se_cmd *cmd,
445 unsigned char *cdb,
446 u8 *alua_ascq)
447{
448
449
450
451
452 switch (cdb[0]) {
453 case INQUIRY:
454 case REPORT_LUNS:
455 return 0;
456 case MAINTENANCE_IN:
457 switch (cdb[1] & 0x1f) {
458 case MI_REPORT_TARGET_PGS:
459 return 0;
460 default:
461 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
462 return 1;
463 }
464 case MAINTENANCE_OUT:
465 switch (cdb[1]) {
466 case MO_SET_TARGET_PGS:
467 return 0;
468 default:
469 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
470 return 1;
471 }
472 case REQUEST_SENSE:
473 case READ_BUFFER:
474 case WRITE_BUFFER:
475 return 0;
476 default:
477 *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
478 return 1;
479 }
480
481 return 0;
482}
483
484static inline int core_alua_state_transition(
485 struct se_cmd *cmd,
486 unsigned char *cdb,
487 u8 *alua_ascq)
488{
489
490
491
492
493 switch (cdb[0]) {
494 case INQUIRY:
495 case REPORT_LUNS:
496 return 0;
497 case MAINTENANCE_IN:
498 switch (cdb[1] & 0x1f) {
499 case MI_REPORT_TARGET_PGS:
500 return 0;
501 default:
502 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
503 return 1;
504 }
505 case REQUEST_SENSE:
506 case READ_BUFFER:
507 case WRITE_BUFFER:
508 return 0;
509 default:
510 *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
511 return 1;
512 }
513
514 return 0;
515}
516
517
518
519
520
521
522sense_reason_t
523target_alua_state_check(struct se_cmd *cmd)
524{
525 struct se_device *dev = cmd->se_dev;
526 unsigned char *cdb = cmd->t_task_cdb;
527 struct se_lun *lun = cmd->se_lun;
528 struct se_port *port = lun->lun_sep;
529 struct t10_alua_tg_pt_gp *tg_pt_gp;
530 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
531 int out_alua_state, nonop_delay_msecs;
532 u8 alua_ascq;
533 int ret;
534
535 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
536 return 0;
537 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
538 return 0;
539
540 if (!port)
541 return 0;
542
543
544
545
546 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
547 pr_debug("ALUA: Got secondary offline status for local"
548 " target port\n");
549 alua_ascq = ASCQ_04H_ALUA_OFFLINE;
550 ret = 1;
551 goto out;
552 }
553
554
555
556
557
558
559 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
560 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
561 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
562 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
563 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
564 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
565
566
567
568
569
570
571 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
572 return 0;
573
574 switch (out_alua_state) {
575 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
576 ret = core_alua_state_nonoptimized(cmd, cdb,
577 nonop_delay_msecs, &alua_ascq);
578 break;
579 case ALUA_ACCESS_STATE_STANDBY:
580 ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
581 break;
582 case ALUA_ACCESS_STATE_UNAVAILABLE:
583 ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
584 break;
585 case ALUA_ACCESS_STATE_TRANSITION:
586 ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
587 break;
588
589
590
591
592 case ALUA_ACCESS_STATE_OFFLINE:
593 default:
594 pr_err("Unknown ALUA access state: 0x%02x\n",
595 out_alua_state);
596 return TCM_INVALID_CDB_FIELD;
597 }
598
599out:
600 if (ret > 0) {
601
602
603
604
605
606 pr_debug("[%s]: ALUA TG Port not available, "
607 "SenseKey: NOT_READY, ASC/ASCQ: "
608 "0x04/0x%02x\n",
609 cmd->se_tfo->get_fabric_name(), alua_ascq);
610
611 cmd->scsi_asc = 0x04;
612 cmd->scsi_ascq = alua_ascq;
613 return TCM_CHECK_CONDITION_NOT_READY;
614 }
615
616 return 0;
617}
618
619
620
621
622static sense_reason_t
623core_alua_check_transition(int state, int *primary)
624{
625 switch (state) {
626 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
627 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
628 case ALUA_ACCESS_STATE_STANDBY:
629 case ALUA_ACCESS_STATE_UNAVAILABLE:
630
631
632
633
634 *primary = 1;
635 break;
636 case ALUA_ACCESS_STATE_OFFLINE:
637
638
639
640
641 *primary = 0;
642 break;
643 default:
644 pr_err("Unknown ALUA access state: 0x%02x\n", state);
645 return TCM_INVALID_PARAMETER_LIST;
646 }
647
648 return 0;
649}
650
651static char *core_alua_dump_state(int state)
652{
653 switch (state) {
654 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
655 return "Active/Optimized";
656 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
657 return "Active/NonOptimized";
658 case ALUA_ACCESS_STATE_STANDBY:
659 return "Standby";
660 case ALUA_ACCESS_STATE_UNAVAILABLE:
661 return "Unavailable";
662 case ALUA_ACCESS_STATE_OFFLINE:
663 return "Offline";
664 default:
665 return "Unknown";
666 }
667
668 return NULL;
669}
670
671char *core_alua_dump_status(int status)
672{
673 switch (status) {
674 case ALUA_STATUS_NONE:
675 return "None";
676 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
677 return "Altered by Explict STPG";
678 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
679 return "Altered by Implict ALUA";
680 default:
681 return "Unknown";
682 }
683
684 return NULL;
685}
686
687
688
689
690
691int core_alua_check_nonop_delay(
692 struct se_cmd *cmd)
693{
694 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
695 return 0;
696 if (in_interrupt())
697 return 0;
698
699
700
701
702 if (!cmd->alua_nonop_delay)
703 return 0;
704
705
706
707
708 msleep_interruptible(cmd->alua_nonop_delay);
709 return 0;
710}
711EXPORT_SYMBOL(core_alua_check_nonop_delay);
712
713
714
715
716
717static int core_alua_write_tpg_metadata(
718 const char *path,
719 unsigned char *md_buf,
720 u32 md_buf_len)
721{
722 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
723 int ret;
724
725 if (IS_ERR(file)) {
726 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
727 return -ENODEV;
728 }
729 ret = kernel_write(file, md_buf, md_buf_len, 0);
730 if (ret < 0)
731 pr_err("Error writing ALUA metadata file: %s\n", path);
732 fput(file);
733 return ret ? -EIO : 0;
734}
735
736
737
738
739static int core_alua_update_tpg_primary_metadata(
740 struct t10_alua_tg_pt_gp *tg_pt_gp,
741 int primary_state,
742 unsigned char *md_buf)
743{
744 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
745 char path[ALUA_METADATA_PATH_LEN];
746 int len;
747
748 memset(path, 0, ALUA_METADATA_PATH_LEN);
749
750 len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
751 "tg_pt_gp_id=%hu\n"
752 "alua_access_state=0x%02x\n"
753 "alua_access_status=0x%02x\n",
754 tg_pt_gp->tg_pt_gp_id, primary_state,
755 tg_pt_gp->tg_pt_gp_alua_access_status);
756
757 snprintf(path, ALUA_METADATA_PATH_LEN,
758 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
759 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
760
761 return core_alua_write_tpg_metadata(path, md_buf, len);
762}
763
764static int core_alua_do_transition_tg_pt(
765 struct t10_alua_tg_pt_gp *tg_pt_gp,
766 struct se_port *l_port,
767 struct se_node_acl *nacl,
768 unsigned char *md_buf,
769 int new_state,
770 int explict)
771{
772 struct se_dev_entry *se_deve;
773 struct se_lun_acl *lacl;
774 struct se_port *port;
775 struct t10_alua_tg_pt_gp_member *mem;
776 int old_state = 0;
777
778
779
780
781 old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
782 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
783 ALUA_ACCESS_STATE_TRANSITION);
784 tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
785 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
786 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
787
788
789
790 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
791 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
792
793 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
794 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
795 tg_pt_gp_mem_list) {
796 port = mem->tg_pt;
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811 atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
812 smp_mb__after_atomic_inc();
813 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
814
815 spin_lock_bh(&port->sep_alua_lock);
816 list_for_each_entry(se_deve, &port->sep_alua_list,
817 alua_port_list) {
818 lacl = se_deve->se_lun_acl;
819
820
821
822
823 if (!lacl)
824 continue;
825
826 if (explict &&
827 (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
828 (l_port != NULL) && (l_port == port))
829 continue;
830
831 core_scsi3_ua_allocate(lacl->se_lun_nacl,
832 se_deve->mapped_lun, 0x2A,
833 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
834 }
835 spin_unlock_bh(&port->sep_alua_lock);
836
837 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
838 atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
839 smp_mb__after_atomic_dec();
840 }
841 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
842
843
844
845
846
847
848
849
850
851
852
853
854 if (tg_pt_gp->tg_pt_gp_write_metadata) {
855 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
856 core_alua_update_tpg_primary_metadata(tg_pt_gp,
857 new_state, md_buf);
858 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
859 }
860
861
862
863 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
864
865 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
866 " from primary access state %s to %s\n", (explict) ? "explict" :
867 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
868 tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
869 core_alua_dump_state(new_state));
870
871 return 0;
872}
873
874int core_alua_do_port_transition(
875 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
876 struct se_device *l_dev,
877 struct se_port *l_port,
878 struct se_node_acl *l_nacl,
879 int new_state,
880 int explict)
881{
882 struct se_device *dev;
883 struct se_port *port;
884 struct se_node_acl *nacl;
885 struct t10_alua_lu_gp *lu_gp;
886 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
887 struct t10_alua_tg_pt_gp *tg_pt_gp;
888 unsigned char *md_buf;
889 int primary;
890
891 if (core_alua_check_transition(new_state, &primary) != 0)
892 return -EINVAL;
893
894 md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
895 if (!md_buf) {
896 pr_err("Unable to allocate buf for ALUA metadata\n");
897 return -ENOMEM;
898 }
899
900 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
901 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
902 lu_gp = local_lu_gp_mem->lu_gp;
903 atomic_inc(&lu_gp->lu_gp_ref_cnt);
904 smp_mb__after_atomic_inc();
905 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
906
907
908
909
910
911 if (!lu_gp->lu_gp_id) {
912
913
914
915
916 core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
917 md_buf, new_state, explict);
918 atomic_dec(&lu_gp->lu_gp_ref_cnt);
919 smp_mb__after_atomic_dec();
920 kfree(md_buf);
921 return 0;
922 }
923
924
925
926
927
928 spin_lock(&lu_gp->lu_gp_lock);
929 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
930 lu_gp_mem_list) {
931
932 dev = lu_gp_mem->lu_gp_mem_dev;
933 atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
934 smp_mb__after_atomic_inc();
935 spin_unlock(&lu_gp->lu_gp_lock);
936
937 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
938 list_for_each_entry(tg_pt_gp,
939 &dev->t10_alua.tg_pt_gps_list,
940 tg_pt_gp_list) {
941
942 if (!tg_pt_gp->tg_pt_gp_valid_id)
943 continue;
944
945
946
947
948
949
950
951
952 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
953 continue;
954
955 if (l_tg_pt_gp == tg_pt_gp) {
956 port = l_port;
957 nacl = l_nacl;
958 } else {
959 port = NULL;
960 nacl = NULL;
961 }
962 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
963 smp_mb__after_atomic_inc();
964 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
965
966
967
968
969 core_alua_do_transition_tg_pt(tg_pt_gp, port,
970 nacl, md_buf, new_state, explict);
971
972 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
973 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
974 smp_mb__after_atomic_dec();
975 }
976 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
977
978 spin_lock(&lu_gp->lu_gp_lock);
979 atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
980 smp_mb__after_atomic_dec();
981 }
982 spin_unlock(&lu_gp->lu_gp_lock);
983
984 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
985 " Group IDs: %hu %s transition to primary state: %s\n",
986 config_item_name(&lu_gp->lu_gp_group.cg_item),
987 l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
988 core_alua_dump_state(new_state));
989
990 atomic_dec(&lu_gp->lu_gp_ref_cnt);
991 smp_mb__after_atomic_dec();
992 kfree(md_buf);
993 return 0;
994}
995
996
997
998
999static int core_alua_update_tpg_secondary_metadata(
1000 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1001 struct se_port *port,
1002 unsigned char *md_buf,
1003 u32 md_buf_len)
1004{
1005 struct se_portal_group *se_tpg = port->sep_tpg;
1006 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1007 int len;
1008
1009 memset(path, 0, ALUA_METADATA_PATH_LEN);
1010 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1011
1012 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1013 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1014
1015 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1016 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1017 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1018
1019 len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
1020 "alua_tg_pt_status=0x%02x\n",
1021 atomic_read(&port->sep_tg_pt_secondary_offline),
1022 port->sep_tg_pt_secondary_stat);
1023
1024 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1025 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1026 port->sep_lun->unpacked_lun);
1027
1028 return core_alua_write_tpg_metadata(path, md_buf, len);
1029}
1030
1031static int core_alua_set_tg_pt_secondary_state(
1032 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1033 struct se_port *port,
1034 int explict,
1035 int offline)
1036{
1037 struct t10_alua_tg_pt_gp *tg_pt_gp;
1038 unsigned char *md_buf;
1039 u32 md_buf_len;
1040 int trans_delay_msecs;
1041
1042 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1043 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1044 if (!tg_pt_gp) {
1045 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1046 pr_err("Unable to complete secondary state"
1047 " transition\n");
1048 return -EINVAL;
1049 }
1050 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1051
1052
1053
1054
1055 if (offline)
1056 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1057 else
1058 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1059
1060 md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
1061 port->sep_tg_pt_secondary_stat = (explict) ?
1062 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
1063 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
1064
1065 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1066 " to secondary access state: %s\n", (explict) ? "explict" :
1067 "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1068 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1069
1070 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1071
1072
1073
1074
1075 if (trans_delay_msecs != 0)
1076 msleep_interruptible(trans_delay_msecs);
1077
1078
1079
1080
1081 if (port->sep_tg_pt_secondary_write_md) {
1082 md_buf = kzalloc(md_buf_len, GFP_KERNEL);
1083 if (!md_buf) {
1084 pr_err("Unable to allocate md_buf for"
1085 " secondary ALUA access metadata\n");
1086 return -ENOMEM;
1087 }
1088 mutex_lock(&port->sep_tg_pt_md_mutex);
1089 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
1090 md_buf, md_buf_len);
1091 mutex_unlock(&port->sep_tg_pt_md_mutex);
1092
1093 kfree(md_buf);
1094 }
1095
1096 return 0;
1097}
1098
1099struct t10_alua_lu_gp *
1100core_alua_allocate_lu_gp(const char *name, int def_group)
1101{
1102 struct t10_alua_lu_gp *lu_gp;
1103
1104 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1105 if (!lu_gp) {
1106 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1107 return ERR_PTR(-ENOMEM);
1108 }
1109 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1110 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1111 spin_lock_init(&lu_gp->lu_gp_lock);
1112 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1113
1114 if (def_group) {
1115 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1116 lu_gp->lu_gp_valid_id = 1;
1117 alua_lu_gps_count++;
1118 }
1119
1120 return lu_gp;
1121}
1122
1123int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1124{
1125 struct t10_alua_lu_gp *lu_gp_tmp;
1126 u16 lu_gp_id_tmp;
1127
1128
1129
1130 if (lu_gp->lu_gp_valid_id) {
1131 pr_warn("ALUA LU Group already has a valid ID,"
1132 " ignoring request\n");
1133 return -EINVAL;
1134 }
1135
1136 spin_lock(&lu_gps_lock);
1137 if (alua_lu_gps_count == 0x0000ffff) {
1138 pr_err("Maximum ALUA alua_lu_gps_count:"
1139 " 0x0000ffff reached\n");
1140 spin_unlock(&lu_gps_lock);
1141 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1142 return -ENOSPC;
1143 }
1144again:
1145 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1146 alua_lu_gps_counter++;
1147
1148 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1149 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1150 if (!lu_gp_id)
1151 goto again;
1152
1153 pr_warn("ALUA Logical Unit Group ID: %hu"
1154 " already exists, ignoring request\n",
1155 lu_gp_id);
1156 spin_unlock(&lu_gps_lock);
1157 return -EINVAL;
1158 }
1159 }
1160
1161 lu_gp->lu_gp_id = lu_gp_id_tmp;
1162 lu_gp->lu_gp_valid_id = 1;
1163 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1164 alua_lu_gps_count++;
1165 spin_unlock(&lu_gps_lock);
1166
1167 return 0;
1168}
1169
1170static struct t10_alua_lu_gp_member *
1171core_alua_allocate_lu_gp_mem(struct se_device *dev)
1172{
1173 struct t10_alua_lu_gp_member *lu_gp_mem;
1174
1175 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1176 if (!lu_gp_mem) {
1177 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1178 return ERR_PTR(-ENOMEM);
1179 }
1180 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1181 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1182 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1183
1184 lu_gp_mem->lu_gp_mem_dev = dev;
1185 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1186
1187 return lu_gp_mem;
1188}
1189
1190void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1191{
1192 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1193
1194
1195
1196
1197
1198
1199
1200
1201 spin_lock(&lu_gps_lock);
1202 list_del(&lu_gp->lu_gp_node);
1203 alua_lu_gps_count--;
1204 spin_unlock(&lu_gps_lock);
1205
1206
1207
1208
1209
1210 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1211 cpu_relax();
1212
1213
1214
1215
1216 spin_lock(&lu_gp->lu_gp_lock);
1217 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1218 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1219 if (lu_gp_mem->lu_gp_assoc) {
1220 list_del(&lu_gp_mem->lu_gp_mem_list);
1221 lu_gp->lu_gp_members--;
1222 lu_gp_mem->lu_gp_assoc = 0;
1223 }
1224 spin_unlock(&lu_gp->lu_gp_lock);
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1235 if (lu_gp != default_lu_gp)
1236 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1237 default_lu_gp);
1238 else
1239 lu_gp_mem->lu_gp = NULL;
1240 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1241
1242 spin_lock(&lu_gp->lu_gp_lock);
1243 }
1244 spin_unlock(&lu_gp->lu_gp_lock);
1245
1246 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1247}
1248
1249void core_alua_free_lu_gp_mem(struct se_device *dev)
1250{
1251 struct t10_alua_lu_gp *lu_gp;
1252 struct t10_alua_lu_gp_member *lu_gp_mem;
1253
1254 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1255 if (!lu_gp_mem)
1256 return;
1257
1258 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1259 cpu_relax();
1260
1261 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1262 lu_gp = lu_gp_mem->lu_gp;
1263 if (lu_gp) {
1264 spin_lock(&lu_gp->lu_gp_lock);
1265 if (lu_gp_mem->lu_gp_assoc) {
1266 list_del(&lu_gp_mem->lu_gp_mem_list);
1267 lu_gp->lu_gp_members--;
1268 lu_gp_mem->lu_gp_assoc = 0;
1269 }
1270 spin_unlock(&lu_gp->lu_gp_lock);
1271 lu_gp_mem->lu_gp = NULL;
1272 }
1273 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1274
1275 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1276}
1277
1278struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1279{
1280 struct t10_alua_lu_gp *lu_gp;
1281 struct config_item *ci;
1282
1283 spin_lock(&lu_gps_lock);
1284 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1285 if (!lu_gp->lu_gp_valid_id)
1286 continue;
1287 ci = &lu_gp->lu_gp_group.cg_item;
1288 if (!strcmp(config_item_name(ci), name)) {
1289 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1290 spin_unlock(&lu_gps_lock);
1291 return lu_gp;
1292 }
1293 }
1294 spin_unlock(&lu_gps_lock);
1295
1296 return NULL;
1297}
1298
1299void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1300{
1301 spin_lock(&lu_gps_lock);
1302 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1303 spin_unlock(&lu_gps_lock);
1304}
1305
1306
1307
1308
1309void __core_alua_attach_lu_gp_mem(
1310 struct t10_alua_lu_gp_member *lu_gp_mem,
1311 struct t10_alua_lu_gp *lu_gp)
1312{
1313 spin_lock(&lu_gp->lu_gp_lock);
1314 lu_gp_mem->lu_gp = lu_gp;
1315 lu_gp_mem->lu_gp_assoc = 1;
1316 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1317 lu_gp->lu_gp_members++;
1318 spin_unlock(&lu_gp->lu_gp_lock);
1319}
1320
1321
1322
1323
1324void __core_alua_drop_lu_gp_mem(
1325 struct t10_alua_lu_gp_member *lu_gp_mem,
1326 struct t10_alua_lu_gp *lu_gp)
1327{
1328 spin_lock(&lu_gp->lu_gp_lock);
1329 list_del(&lu_gp_mem->lu_gp_mem_list);
1330 lu_gp_mem->lu_gp = NULL;
1331 lu_gp_mem->lu_gp_assoc = 0;
1332 lu_gp->lu_gp_members--;
1333 spin_unlock(&lu_gp->lu_gp_lock);
1334}
1335
1336struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1337 const char *name, int def_group)
1338{
1339 struct t10_alua_tg_pt_gp *tg_pt_gp;
1340
1341 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1342 if (!tg_pt_gp) {
1343 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1344 return NULL;
1345 }
1346 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1347 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1348 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1349 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1350 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1351 tg_pt_gp->tg_pt_gp_dev = dev;
1352 tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
1353 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1354 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
1355
1356
1357
1358 tg_pt_gp->tg_pt_gp_alua_access_type =
1359 TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
1360
1361
1362
1363 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1364 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1365 tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS;
1366
1367 if (def_group) {
1368 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1369 tg_pt_gp->tg_pt_gp_id =
1370 dev->t10_alua.alua_tg_pt_gps_counter++;
1371 tg_pt_gp->tg_pt_gp_valid_id = 1;
1372 dev->t10_alua.alua_tg_pt_gps_count++;
1373 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1374 &dev->t10_alua.tg_pt_gps_list);
1375 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1376 }
1377
1378 return tg_pt_gp;
1379}
1380
1381int core_alua_set_tg_pt_gp_id(
1382 struct t10_alua_tg_pt_gp *tg_pt_gp,
1383 u16 tg_pt_gp_id)
1384{
1385 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1386 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1387 u16 tg_pt_gp_id_tmp;
1388
1389
1390
1391
1392 if (tg_pt_gp->tg_pt_gp_valid_id) {
1393 pr_warn("ALUA TG PT Group already has a valid ID,"
1394 " ignoring request\n");
1395 return -EINVAL;
1396 }
1397
1398 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1399 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1400 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1401 " 0x0000ffff reached\n");
1402 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1403 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1404 return -ENOSPC;
1405 }
1406again:
1407 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1408 dev->t10_alua.alua_tg_pt_gps_counter++;
1409
1410 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1411 tg_pt_gp_list) {
1412 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1413 if (!tg_pt_gp_id)
1414 goto again;
1415
1416 pr_err("ALUA Target Port Group ID: %hu already"
1417 " exists, ignoring request\n", tg_pt_gp_id);
1418 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1419 return -EINVAL;
1420 }
1421 }
1422
1423 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1424 tg_pt_gp->tg_pt_gp_valid_id = 1;
1425 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1426 &dev->t10_alua.tg_pt_gps_list);
1427 dev->t10_alua.alua_tg_pt_gps_count++;
1428 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1429
1430 return 0;
1431}
1432
1433struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1434 struct se_port *port)
1435{
1436 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1437
1438 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1439 GFP_KERNEL);
1440 if (!tg_pt_gp_mem) {
1441 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1442 return ERR_PTR(-ENOMEM);
1443 }
1444 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1445 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1446 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1447
1448 tg_pt_gp_mem->tg_pt = port;
1449 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1450
1451 return tg_pt_gp_mem;
1452}
1453
1454void core_alua_free_tg_pt_gp(
1455 struct t10_alua_tg_pt_gp *tg_pt_gp)
1456{
1457 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1458 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1469 list_del(&tg_pt_gp->tg_pt_gp_list);
1470 dev->t10_alua.alua_tg_pt_gps_counter--;
1471 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1472
1473
1474
1475
1476
1477
1478
1479 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1480 cpu_relax();
1481
1482
1483
1484
1485
1486 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1487 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1488 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1489 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1490 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1491 tg_pt_gp->tg_pt_gp_members--;
1492 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1493 }
1494 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1505 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1506 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1507 dev->t10_alua.default_tg_pt_gp);
1508 } else
1509 tg_pt_gp_mem->tg_pt_gp = NULL;
1510 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1511
1512 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1513 }
1514 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1515
1516 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1517}
1518
1519void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1520{
1521 struct t10_alua_tg_pt_gp *tg_pt_gp;
1522 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1523
1524 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1525 if (!tg_pt_gp_mem)
1526 return;
1527
1528 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1529 cpu_relax();
1530
1531 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1532 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1533 if (tg_pt_gp) {
1534 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1535 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1536 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1537 tg_pt_gp->tg_pt_gp_members--;
1538 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1539 }
1540 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1541 tg_pt_gp_mem->tg_pt_gp = NULL;
1542 }
1543 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1544
1545 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1546}
1547
1548static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1549 struct se_device *dev, const char *name)
1550{
1551 struct t10_alua_tg_pt_gp *tg_pt_gp;
1552 struct config_item *ci;
1553
1554 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1555 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1556 tg_pt_gp_list) {
1557 if (!tg_pt_gp->tg_pt_gp_valid_id)
1558 continue;
1559 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1560 if (!strcmp(config_item_name(ci), name)) {
1561 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1562 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1563 return tg_pt_gp;
1564 }
1565 }
1566 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1567
1568 return NULL;
1569}
1570
1571static void core_alua_put_tg_pt_gp_from_name(
1572 struct t10_alua_tg_pt_gp *tg_pt_gp)
1573{
1574 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1575
1576 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1577 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1578 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1579}
1580
1581
1582
1583
1584void __core_alua_attach_tg_pt_gp_mem(
1585 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1586 struct t10_alua_tg_pt_gp *tg_pt_gp)
1587{
1588 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1589 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1590 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1591 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1592 &tg_pt_gp->tg_pt_gp_mem_list);
1593 tg_pt_gp->tg_pt_gp_members++;
1594 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1595}
1596
1597
1598
1599
1600static void __core_alua_drop_tg_pt_gp_mem(
1601 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1602 struct t10_alua_tg_pt_gp *tg_pt_gp)
1603{
1604 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1605 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1606 tg_pt_gp_mem->tg_pt_gp = NULL;
1607 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1608 tg_pt_gp->tg_pt_gp_members--;
1609 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1610}
1611
1612ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1613{
1614 struct config_item *tg_pt_ci;
1615 struct t10_alua_tg_pt_gp *tg_pt_gp;
1616 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1617 ssize_t len = 0;
1618
1619 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1620 if (!tg_pt_gp_mem)
1621 return len;
1622
1623 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1624 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1625 if (tg_pt_gp) {
1626 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1627 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1628 " %hu\nTG Port Primary Access State: %s\nTG Port "
1629 "Primary Access Status: %s\nTG Port Secondary Access"
1630 " State: %s\nTG Port Secondary Access Status: %s\n",
1631 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1632 core_alua_dump_state(atomic_read(
1633 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1634 core_alua_dump_status(
1635 tg_pt_gp->tg_pt_gp_alua_access_status),
1636 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
1637 "Offline" : "None",
1638 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
1639 }
1640 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1641
1642 return len;
1643}
1644
1645ssize_t core_alua_store_tg_pt_gp_info(
1646 struct se_port *port,
1647 const char *page,
1648 size_t count)
1649{
1650 struct se_portal_group *tpg;
1651 struct se_lun *lun;
1652 struct se_device *dev = port->sep_lun->lun_se_dev;
1653 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1654 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1655 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1656 int move = 0;
1657
1658 tpg = port->sep_tpg;
1659 lun = port->sep_lun;
1660
1661 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1662 if (!tg_pt_gp_mem)
1663 return 0;
1664
1665 if (count > TG_PT_GROUP_NAME_BUF) {
1666 pr_err("ALUA Target Port Group alias too large!\n");
1667 return -EINVAL;
1668 }
1669 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1670 memcpy(buf, page, count);
1671
1672
1673
1674
1675 if (strcmp(strstrip(buf), "NULL")) {
1676
1677
1678
1679
1680
1681 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1682 strstrip(buf));
1683 if (!tg_pt_gp_new)
1684 return -ENODEV;
1685 }
1686
1687 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1688 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1689 if (tg_pt_gp) {
1690
1691
1692
1693
1694 if (!tg_pt_gp_new) {
1695 pr_debug("Target_Core_ConfigFS: Moving"
1696 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1697 " alua/%s, ID: %hu back to"
1698 " default_tg_pt_gp\n",
1699 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1700 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1701 config_item_name(&lun->lun_group.cg_item),
1702 config_item_name(
1703 &tg_pt_gp->tg_pt_gp_group.cg_item),
1704 tg_pt_gp->tg_pt_gp_id);
1705
1706 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1707 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1708 dev->t10_alua.default_tg_pt_gp);
1709 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1710
1711 return count;
1712 }
1713
1714
1715
1716 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
1717 move = 1;
1718 }
1719
1720
1721
1722 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
1723 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1724 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1725 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1726 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1727 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1728 config_item_name(&lun->lun_group.cg_item),
1729 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1730 tg_pt_gp_new->tg_pt_gp_id);
1731
1732 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1733 return count;
1734}
1735
1736ssize_t core_alua_show_access_type(
1737 struct t10_alua_tg_pt_gp *tg_pt_gp,
1738 char *page)
1739{
1740 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
1741 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
1742 return sprintf(page, "Implict and Explict\n");
1743 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
1744 return sprintf(page, "Implict\n");
1745 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
1746 return sprintf(page, "Explict\n");
1747 else
1748 return sprintf(page, "None\n");
1749}
1750
1751ssize_t core_alua_store_access_type(
1752 struct t10_alua_tg_pt_gp *tg_pt_gp,
1753 const char *page,
1754 size_t count)
1755{
1756 unsigned long tmp;
1757 int ret;
1758
1759 ret = strict_strtoul(page, 0, &tmp);
1760 if (ret < 0) {
1761 pr_err("Unable to extract alua_access_type\n");
1762 return -EINVAL;
1763 }
1764 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
1765 pr_err("Illegal value for alua_access_type:"
1766 " %lu\n", tmp);
1767 return -EINVAL;
1768 }
1769 if (tmp == 3)
1770 tg_pt_gp->tg_pt_gp_alua_access_type =
1771 TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
1772 else if (tmp == 2)
1773 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
1774 else if (tmp == 1)
1775 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
1776 else
1777 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
1778
1779 return count;
1780}
1781
1782ssize_t core_alua_show_nonop_delay_msecs(
1783 struct t10_alua_tg_pt_gp *tg_pt_gp,
1784 char *page)
1785{
1786 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
1787}
1788
1789ssize_t core_alua_store_nonop_delay_msecs(
1790 struct t10_alua_tg_pt_gp *tg_pt_gp,
1791 const char *page,
1792 size_t count)
1793{
1794 unsigned long tmp;
1795 int ret;
1796
1797 ret = strict_strtoul(page, 0, &tmp);
1798 if (ret < 0) {
1799 pr_err("Unable to extract nonop_delay_msecs\n");
1800 return -EINVAL;
1801 }
1802 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
1803 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1804 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
1805 ALUA_MAX_NONOP_DELAY_MSECS);
1806 return -EINVAL;
1807 }
1808 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
1809
1810 return count;
1811}
1812
1813ssize_t core_alua_show_trans_delay_msecs(
1814 struct t10_alua_tg_pt_gp *tg_pt_gp,
1815 char *page)
1816{
1817 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1818}
1819
1820ssize_t core_alua_store_trans_delay_msecs(
1821 struct t10_alua_tg_pt_gp *tg_pt_gp,
1822 const char *page,
1823 size_t count)
1824{
1825 unsigned long tmp;
1826 int ret;
1827
1828 ret = strict_strtoul(page, 0, &tmp);
1829 if (ret < 0) {
1830 pr_err("Unable to extract trans_delay_msecs\n");
1831 return -EINVAL;
1832 }
1833 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
1834 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1835 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
1836 ALUA_MAX_TRANS_DELAY_MSECS);
1837 return -EINVAL;
1838 }
1839 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
1840
1841 return count;
1842}
1843
1844ssize_t core_alua_show_implict_trans_secs(
1845 struct t10_alua_tg_pt_gp *tg_pt_gp,
1846 char *page)
1847{
1848 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs);
1849}
1850
1851ssize_t core_alua_store_implict_trans_secs(
1852 struct t10_alua_tg_pt_gp *tg_pt_gp,
1853 const char *page,
1854 size_t count)
1855{
1856 unsigned long tmp;
1857 int ret;
1858
1859 ret = strict_strtoul(page, 0, &tmp);
1860 if (ret < 0) {
1861 pr_err("Unable to extract implict_trans_secs\n");
1862 return -EINVAL;
1863 }
1864 if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) {
1865 pr_err("Passed implict_trans_secs: %lu, exceeds"
1866 " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp,
1867 ALUA_MAX_IMPLICT_TRANS_SECS);
1868 return -EINVAL;
1869 }
1870 tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp;
1871
1872 return count;
1873}
1874
1875ssize_t core_alua_show_preferred_bit(
1876 struct t10_alua_tg_pt_gp *tg_pt_gp,
1877 char *page)
1878{
1879 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
1880}
1881
1882ssize_t core_alua_store_preferred_bit(
1883 struct t10_alua_tg_pt_gp *tg_pt_gp,
1884 const char *page,
1885 size_t count)
1886{
1887 unsigned long tmp;
1888 int ret;
1889
1890 ret = strict_strtoul(page, 0, &tmp);
1891 if (ret < 0) {
1892 pr_err("Unable to extract preferred ALUA value\n");
1893 return -EINVAL;
1894 }
1895 if ((tmp != 0) && (tmp != 1)) {
1896 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
1897 return -EINVAL;
1898 }
1899 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
1900
1901 return count;
1902}
1903
1904ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
1905{
1906 if (!lun->lun_sep)
1907 return -ENODEV;
1908
1909 return sprintf(page, "%d\n",
1910 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
1911}
1912
1913ssize_t core_alua_store_offline_bit(
1914 struct se_lun *lun,
1915 const char *page,
1916 size_t count)
1917{
1918 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1919 unsigned long tmp;
1920 int ret;
1921
1922 if (!lun->lun_sep)
1923 return -ENODEV;
1924
1925 ret = strict_strtoul(page, 0, &tmp);
1926 if (ret < 0) {
1927 pr_err("Unable to extract alua_tg_pt_offline value\n");
1928 return -EINVAL;
1929 }
1930 if ((tmp != 0) && (tmp != 1)) {
1931 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1932 tmp);
1933 return -EINVAL;
1934 }
1935 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
1936 if (!tg_pt_gp_mem) {
1937 pr_err("Unable to locate *tg_pt_gp_mem\n");
1938 return -EINVAL;
1939 }
1940
1941 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
1942 lun->lun_sep, 0, (int)tmp);
1943 if (ret < 0)
1944 return -EINVAL;
1945
1946 return count;
1947}
1948
1949ssize_t core_alua_show_secondary_status(
1950 struct se_lun *lun,
1951 char *page)
1952{
1953 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
1954}
1955
1956ssize_t core_alua_store_secondary_status(
1957 struct se_lun *lun,
1958 const char *page,
1959 size_t count)
1960{
1961 unsigned long tmp;
1962 int ret;
1963
1964 ret = strict_strtoul(page, 0, &tmp);
1965 if (ret < 0) {
1966 pr_err("Unable to extract alua_tg_pt_status\n");
1967 return -EINVAL;
1968 }
1969 if ((tmp != ALUA_STATUS_NONE) &&
1970 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
1971 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
1972 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1973 tmp);
1974 return -EINVAL;
1975 }
1976 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
1977
1978 return count;
1979}
1980
1981ssize_t core_alua_show_secondary_write_metadata(
1982 struct se_lun *lun,
1983 char *page)
1984{
1985 return sprintf(page, "%d\n",
1986 lun->lun_sep->sep_tg_pt_secondary_write_md);
1987}
1988
1989ssize_t core_alua_store_secondary_write_metadata(
1990 struct se_lun *lun,
1991 const char *page,
1992 size_t count)
1993{
1994 unsigned long tmp;
1995 int ret;
1996
1997 ret = strict_strtoul(page, 0, &tmp);
1998 if (ret < 0) {
1999 pr_err("Unable to extract alua_tg_pt_write_md\n");
2000 return -EINVAL;
2001 }
2002 if ((tmp != 0) && (tmp != 1)) {
2003 pr_err("Illegal value for alua_tg_pt_write_md:"
2004 " %lu\n", tmp);
2005 return -EINVAL;
2006 }
2007 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2008
2009 return count;
2010}
2011
2012int core_setup_alua(struct se_device *dev)
2013{
2014 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
2015 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2016 struct t10_alua_lu_gp_member *lu_gp_mem;
2017
2018
2019
2020
2021
2022 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2023 if (IS_ERR(lu_gp_mem))
2024 return PTR_ERR(lu_gp_mem);
2025
2026 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2027 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2028 default_lu_gp);
2029 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2030
2031 pr_debug("%s: Adding to default ALUA LU Group:"
2032 " core/alua/lu_gps/default_lu_gp\n",
2033 dev->transport->name);
2034 }
2035
2036 return 0;
2037}
2038