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Merge branch 'stable/for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-zesty-kernel.git] / drivers / target / target_core_alua.c
1 /*******************************************************************************
2 * Filename: target_core_alua.c
3 *
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
5 *
6 * (c) Copyright 2009-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/delay.h>
30 #include <linux/export.h>
31 #include <linux/fcntl.h>
32 #include <linux/file.h>
33 #include <linux/fs.h>
34 #include <scsi/scsi_proto.h>
35 #include <asm/unaligned.h>
36
37 #include <target/target_core_base.h>
38 #include <target/target_core_backend.h>
39 #include <target/target_core_fabric.h>
40
41 #include "target_core_internal.h"
42 #include "target_core_alua.h"
43 #include "target_core_ua.h"
44
45 static sense_reason_t core_alua_check_transition(int state, int valid,
46 int *primary);
47 static int core_alua_set_tg_pt_secondary_state(
48 struct se_lun *lun, int explicit, int offline);
49
50 static char *core_alua_dump_state(int state);
51
52 static void __target_attach_tg_pt_gp(struct se_lun *lun,
53 struct t10_alua_tg_pt_gp *tg_pt_gp);
54
55 static u16 alua_lu_gps_counter;
56 static u32 alua_lu_gps_count;
57
58 static DEFINE_SPINLOCK(lu_gps_lock);
59 static LIST_HEAD(lu_gps_list);
60
61 struct t10_alua_lu_gp *default_lu_gp;
62
63 /*
64 * REPORT REFERRALS
65 *
66 * See sbc3r35 section 5.23
67 */
68 sense_reason_t
69 target_emulate_report_referrals(struct se_cmd *cmd)
70 {
71 struct se_device *dev = cmd->se_dev;
72 struct t10_alua_lba_map *map;
73 struct t10_alua_lba_map_member *map_mem;
74 unsigned char *buf;
75 u32 rd_len = 0, off;
76
77 if (cmd->data_length < 4) {
78 pr_warn("REPORT REFERRALS allocation length %u too"
79 " small\n", cmd->data_length);
80 return TCM_INVALID_CDB_FIELD;
81 }
82
83 buf = transport_kmap_data_sg(cmd);
84 if (!buf)
85 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
86
87 off = 4;
88 spin_lock(&dev->t10_alua.lba_map_lock);
89 if (list_empty(&dev->t10_alua.lba_map_list)) {
90 spin_unlock(&dev->t10_alua.lba_map_lock);
91 transport_kunmap_data_sg(cmd);
92
93 return TCM_UNSUPPORTED_SCSI_OPCODE;
94 }
95
96 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
97 lba_map_list) {
98 int desc_num = off + 3;
99 int pg_num;
100
101 off += 4;
102 if (cmd->data_length > off)
103 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
104 off += 8;
105 if (cmd->data_length > off)
106 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
107 off += 8;
108 rd_len += 20;
109 pg_num = 0;
110 list_for_each_entry(map_mem, &map->lba_map_mem_list,
111 lba_map_mem_list) {
112 int alua_state = map_mem->lba_map_mem_alua_state;
113 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
114
115 if (cmd->data_length > off)
116 buf[off] = alua_state & 0x0f;
117 off += 2;
118 if (cmd->data_length > off)
119 buf[off] = (alua_pg_id >> 8) & 0xff;
120 off++;
121 if (cmd->data_length > off)
122 buf[off] = (alua_pg_id & 0xff);
123 off++;
124 rd_len += 4;
125 pg_num++;
126 }
127 if (cmd->data_length > desc_num)
128 buf[desc_num] = pg_num;
129 }
130 spin_unlock(&dev->t10_alua.lba_map_lock);
131
132 /*
133 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
134 */
135 put_unaligned_be16(rd_len, &buf[2]);
136
137 transport_kunmap_data_sg(cmd);
138
139 target_complete_cmd(cmd, GOOD);
140 return 0;
141 }
142
143 /*
144 * REPORT_TARGET_PORT_GROUPS
145 *
146 * See spc4r17 section 6.27
147 */
148 sense_reason_t
149 target_emulate_report_target_port_groups(struct se_cmd *cmd)
150 {
151 struct se_device *dev = cmd->se_dev;
152 struct t10_alua_tg_pt_gp *tg_pt_gp;
153 struct se_lun *lun;
154 unsigned char *buf;
155 u32 rd_len = 0, off;
156 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
157
158 /*
159 * Skip over RESERVED area to first Target port group descriptor
160 * depending on the PARAMETER DATA FORMAT type..
161 */
162 if (ext_hdr != 0)
163 off = 8;
164 else
165 off = 4;
166
167 if (cmd->data_length < off) {
168 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
169 " small for %s header\n", cmd->data_length,
170 (ext_hdr) ? "extended" : "normal");
171 return TCM_INVALID_CDB_FIELD;
172 }
173 buf = transport_kmap_data_sg(cmd);
174 if (!buf)
175 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
176
177 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
178 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
179 tg_pt_gp_list) {
180 /*
181 * Check if the Target port group and Target port descriptor list
182 * based on tg_pt_gp_members count will fit into the response payload.
183 * Otherwise, bump rd_len to let the initiator know we have exceeded
184 * the allocation length and the response is truncated.
185 */
186 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
187 cmd->data_length) {
188 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
189 continue;
190 }
191 /*
192 * PREF: Preferred target port bit, determine if this
193 * bit should be set for port group.
194 */
195 if (tg_pt_gp->tg_pt_gp_pref)
196 buf[off] = 0x80;
197 /*
198 * Set the ASYMMETRIC ACCESS State
199 */
200 buf[off++] |= (atomic_read(
201 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
202 /*
203 * Set supported ASYMMETRIC ACCESS State bits
204 */
205 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
206 /*
207 * TARGET PORT GROUP
208 */
209 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
210 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
211
212 off++; /* Skip over Reserved */
213 /*
214 * STATUS CODE
215 */
216 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
217 /*
218 * Vendor Specific field
219 */
220 buf[off++] = 0x00;
221 /*
222 * TARGET PORT COUNT
223 */
224 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
225 rd_len += 8;
226
227 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
228 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
229 lun_tg_pt_gp_link) {
230 /*
231 * Start Target Port descriptor format
232 *
233 * See spc4r17 section 6.2.7 Table 247
234 */
235 off += 2; /* Skip over Obsolete */
236 /*
237 * Set RELATIVE TARGET PORT IDENTIFIER
238 */
239 buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
240 buf[off++] = (lun->lun_rtpi & 0xff);
241 rd_len += 4;
242 }
243 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
244 }
245 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
246 /*
247 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
248 */
249 put_unaligned_be32(rd_len, &buf[0]);
250
251 /*
252 * Fill in the Extended header parameter data format if requested
253 */
254 if (ext_hdr != 0) {
255 buf[4] = 0x10;
256 /*
257 * Set the implicit transition time (in seconds) for the application
258 * client to use as a base for it's transition timeout value.
259 *
260 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
261 * this CDB was received upon to determine this value individually
262 * for ALUA target port group.
263 */
264 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
265 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
266 if (tg_pt_gp)
267 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
268 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
269 }
270 transport_kunmap_data_sg(cmd);
271
272 target_complete_cmd(cmd, GOOD);
273 return 0;
274 }
275
276 /*
277 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
278 *
279 * See spc4r17 section 6.35
280 */
281 sense_reason_t
282 target_emulate_set_target_port_groups(struct se_cmd *cmd)
283 {
284 struct se_device *dev = cmd->se_dev;
285 struct se_lun *l_lun = cmd->se_lun;
286 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
287 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
288 unsigned char *buf;
289 unsigned char *ptr;
290 sense_reason_t rc = TCM_NO_SENSE;
291 u32 len = 4; /* Skip over RESERVED area in header */
292 int alua_access_state, primary = 0, valid_states;
293 u16 tg_pt_id, rtpi;
294
295 if (cmd->data_length < 4) {
296 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
297 " small\n", cmd->data_length);
298 return TCM_INVALID_PARAMETER_LIST;
299 }
300
301 buf = transport_kmap_data_sg(cmd);
302 if (!buf)
303 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
304
305 /*
306 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
307 * for the local tg_pt_gp.
308 */
309 spin_lock(&l_lun->lun_tg_pt_gp_lock);
310 l_tg_pt_gp = l_lun->lun_tg_pt_gp;
311 if (!l_tg_pt_gp) {
312 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
313 pr_err("Unable to access l_lun->tg_pt_gp\n");
314 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
315 goto out;
316 }
317
318 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
319 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
320 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
321 " while TPGS_EXPLICIT_ALUA is disabled\n");
322 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
323 goto out;
324 }
325 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
326 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
327
328 ptr = &buf[4]; /* Skip over RESERVED area in header */
329
330 while (len < cmd->data_length) {
331 bool found = false;
332 alua_access_state = (ptr[0] & 0x0f);
333 /*
334 * Check the received ALUA access state, and determine if
335 * the state is a primary or secondary target port asymmetric
336 * access state.
337 */
338 rc = core_alua_check_transition(alua_access_state,
339 valid_states, &primary);
340 if (rc) {
341 /*
342 * If the SET TARGET PORT GROUPS attempts to establish
343 * an invalid combination of target port asymmetric
344 * access states or attempts to establish an
345 * unsupported target port asymmetric access state,
346 * then the command shall be terminated with CHECK
347 * CONDITION status, with the sense key set to ILLEGAL
348 * REQUEST, and the additional sense code set to INVALID
349 * FIELD IN PARAMETER LIST.
350 */
351 goto out;
352 }
353
354 /*
355 * If the ASYMMETRIC ACCESS STATE field (see table 267)
356 * specifies a primary target port asymmetric access state,
357 * then the TARGET PORT GROUP OR TARGET PORT field specifies
358 * a primary target port group for which the primary target
359 * port asymmetric access state shall be changed. If the
360 * ASYMMETRIC ACCESS STATE field specifies a secondary target
361 * port asymmetric access state, then the TARGET PORT GROUP OR
362 * TARGET PORT field specifies the relative target port
363 * identifier (see 3.1.120) of the target port for which the
364 * secondary target port asymmetric access state shall be
365 * changed.
366 */
367 if (primary) {
368 tg_pt_id = get_unaligned_be16(ptr + 2);
369 /*
370 * Locate the matching target port group ID from
371 * the global tg_pt_gp list
372 */
373 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
374 list_for_each_entry(tg_pt_gp,
375 &dev->t10_alua.tg_pt_gps_list,
376 tg_pt_gp_list) {
377 if (!tg_pt_gp->tg_pt_gp_valid_id)
378 continue;
379
380 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
381 continue;
382
383 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
384
385 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
386
387 if (!core_alua_do_port_transition(tg_pt_gp,
388 dev, l_lun, nacl,
389 alua_access_state, 1))
390 found = true;
391
392 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
393 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
394 break;
395 }
396 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
397 } else {
398 struct se_lun *lun;
399
400 /*
401 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
402 * the Target Port in question for the the incoming
403 * SET_TARGET_PORT_GROUPS op.
404 */
405 rtpi = get_unaligned_be16(ptr + 2);
406 /*
407 * Locate the matching relative target port identifier
408 * for the struct se_device storage object.
409 */
410 spin_lock(&dev->se_port_lock);
411 list_for_each_entry(lun, &dev->dev_sep_list,
412 lun_dev_link) {
413 if (lun->lun_rtpi != rtpi)
414 continue;
415
416 // XXX: racy unlock
417 spin_unlock(&dev->se_port_lock);
418
419 if (!core_alua_set_tg_pt_secondary_state(
420 lun, 1, 1))
421 found = true;
422
423 spin_lock(&dev->se_port_lock);
424 break;
425 }
426 spin_unlock(&dev->se_port_lock);
427 }
428
429 if (!found) {
430 rc = TCM_INVALID_PARAMETER_LIST;
431 goto out;
432 }
433
434 ptr += 4;
435 len += 4;
436 }
437
438 out:
439 transport_kunmap_data_sg(cmd);
440 if (!rc)
441 target_complete_cmd(cmd, GOOD);
442 return rc;
443 }
444
445 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
446 {
447 /*
448 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
449 * The ALUA additional sense code qualifier (ASCQ) is determined
450 * by the ALUA primary or secondary access state..
451 */
452 pr_debug("[%s]: ALUA TG Port not available, "
453 "SenseKey: NOT_READY, ASC/ASCQ: "
454 "0x04/0x%02x\n",
455 cmd->se_tfo->get_fabric_name(), alua_ascq);
456
457 cmd->scsi_asc = 0x04;
458 cmd->scsi_ascq = alua_ascq;
459 }
460
461 static inline void core_alua_state_nonoptimized(
462 struct se_cmd *cmd,
463 unsigned char *cdb,
464 int nonop_delay_msecs)
465 {
466 /*
467 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
468 * later to determine if processing of this cmd needs to be
469 * temporarily delayed for the Active/NonOptimized primary access state.
470 */
471 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
472 cmd->alua_nonop_delay = nonop_delay_msecs;
473 }
474
475 static inline int core_alua_state_lba_dependent(
476 struct se_cmd *cmd,
477 struct t10_alua_tg_pt_gp *tg_pt_gp)
478 {
479 struct se_device *dev = cmd->se_dev;
480 u64 segment_size, segment_mult, sectors, lba;
481
482 /* Only need to check for cdb actually containing LBAs */
483 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
484 return 0;
485
486 spin_lock(&dev->t10_alua.lba_map_lock);
487 segment_size = dev->t10_alua.lba_map_segment_size;
488 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
489 sectors = cmd->data_length / dev->dev_attrib.block_size;
490
491 lba = cmd->t_task_lba;
492 while (lba < cmd->t_task_lba + sectors) {
493 struct t10_alua_lba_map *cur_map = NULL, *map;
494 struct t10_alua_lba_map_member *map_mem;
495
496 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
497 lba_map_list) {
498 u64 start_lba, last_lba;
499 u64 first_lba = map->lba_map_first_lba;
500
501 if (segment_mult) {
502 u64 tmp = lba;
503 start_lba = do_div(tmp, segment_size * segment_mult);
504
505 last_lba = first_lba + segment_size - 1;
506 if (start_lba >= first_lba &&
507 start_lba <= last_lba) {
508 lba += segment_size;
509 cur_map = map;
510 break;
511 }
512 } else {
513 last_lba = map->lba_map_last_lba;
514 if (lba >= first_lba && lba <= last_lba) {
515 lba = last_lba + 1;
516 cur_map = map;
517 break;
518 }
519 }
520 }
521 if (!cur_map) {
522 spin_unlock(&dev->t10_alua.lba_map_lock);
523 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
524 return 1;
525 }
526 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
527 lba_map_mem_list) {
528 if (map_mem->lba_map_mem_alua_pg_id !=
529 tg_pt_gp->tg_pt_gp_id)
530 continue;
531 switch(map_mem->lba_map_mem_alua_state) {
532 case ALUA_ACCESS_STATE_STANDBY:
533 spin_unlock(&dev->t10_alua.lba_map_lock);
534 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
535 return 1;
536 case ALUA_ACCESS_STATE_UNAVAILABLE:
537 spin_unlock(&dev->t10_alua.lba_map_lock);
538 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
539 return 1;
540 default:
541 break;
542 }
543 }
544 }
545 spin_unlock(&dev->t10_alua.lba_map_lock);
546 return 0;
547 }
548
549 static inline int core_alua_state_standby(
550 struct se_cmd *cmd,
551 unsigned char *cdb)
552 {
553 /*
554 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
555 * spc4r17 section 5.9.2.4.4
556 */
557 switch (cdb[0]) {
558 case INQUIRY:
559 case LOG_SELECT:
560 case LOG_SENSE:
561 case MODE_SELECT:
562 case MODE_SENSE:
563 case REPORT_LUNS:
564 case RECEIVE_DIAGNOSTIC:
565 case SEND_DIAGNOSTIC:
566 case READ_CAPACITY:
567 return 0;
568 case SERVICE_ACTION_IN_16:
569 switch (cdb[1] & 0x1f) {
570 case SAI_READ_CAPACITY_16:
571 return 0;
572 default:
573 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
574 return 1;
575 }
576 case MAINTENANCE_IN:
577 switch (cdb[1] & 0x1f) {
578 case MI_REPORT_TARGET_PGS:
579 return 0;
580 default:
581 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
582 return 1;
583 }
584 case MAINTENANCE_OUT:
585 switch (cdb[1]) {
586 case MO_SET_TARGET_PGS:
587 return 0;
588 default:
589 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
590 return 1;
591 }
592 case REQUEST_SENSE:
593 case PERSISTENT_RESERVE_IN:
594 case PERSISTENT_RESERVE_OUT:
595 case READ_BUFFER:
596 case WRITE_BUFFER:
597 return 0;
598 default:
599 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
600 return 1;
601 }
602
603 return 0;
604 }
605
606 static inline int core_alua_state_unavailable(
607 struct se_cmd *cmd,
608 unsigned char *cdb)
609 {
610 /*
611 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
612 * spc4r17 section 5.9.2.4.5
613 */
614 switch (cdb[0]) {
615 case INQUIRY:
616 case REPORT_LUNS:
617 return 0;
618 case MAINTENANCE_IN:
619 switch (cdb[1] & 0x1f) {
620 case MI_REPORT_TARGET_PGS:
621 return 0;
622 default:
623 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
624 return 1;
625 }
626 case MAINTENANCE_OUT:
627 switch (cdb[1]) {
628 case MO_SET_TARGET_PGS:
629 return 0;
630 default:
631 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
632 return 1;
633 }
634 case REQUEST_SENSE:
635 case READ_BUFFER:
636 case WRITE_BUFFER:
637 return 0;
638 default:
639 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
640 return 1;
641 }
642
643 return 0;
644 }
645
646 static inline int core_alua_state_transition(
647 struct se_cmd *cmd,
648 unsigned char *cdb)
649 {
650 /*
651 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
652 * spc4r17 section 5.9.2.5
653 */
654 switch (cdb[0]) {
655 case INQUIRY:
656 case REPORT_LUNS:
657 return 0;
658 case MAINTENANCE_IN:
659 switch (cdb[1] & 0x1f) {
660 case MI_REPORT_TARGET_PGS:
661 return 0;
662 default:
663 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
664 return 1;
665 }
666 case REQUEST_SENSE:
667 case READ_BUFFER:
668 case WRITE_BUFFER:
669 return 0;
670 default:
671 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
672 return 1;
673 }
674
675 return 0;
676 }
677
678 /*
679 * return 1: Is used to signal LUN not accessible, and check condition/not ready
680 * return 0: Used to signal success
681 * return -1: Used to signal failure, and invalid cdb field
682 */
683 sense_reason_t
684 target_alua_state_check(struct se_cmd *cmd)
685 {
686 struct se_device *dev = cmd->se_dev;
687 unsigned char *cdb = cmd->t_task_cdb;
688 struct se_lun *lun = cmd->se_lun;
689 struct t10_alua_tg_pt_gp *tg_pt_gp;
690 int out_alua_state, nonop_delay_msecs;
691
692 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
693 return 0;
694 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
695 return 0;
696
697 /*
698 * First, check for a struct se_port specific secondary ALUA target port
699 * access state: OFFLINE
700 */
701 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
702 pr_debug("ALUA: Got secondary offline status for local"
703 " target port\n");
704 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
705 return TCM_CHECK_CONDITION_NOT_READY;
706 }
707
708 if (!lun->lun_tg_pt_gp)
709 return 0;
710
711 spin_lock(&lun->lun_tg_pt_gp_lock);
712 tg_pt_gp = lun->lun_tg_pt_gp;
713 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
714 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
715
716 // XXX: keeps using tg_pt_gp witout reference after unlock
717 spin_unlock(&lun->lun_tg_pt_gp_lock);
718 /*
719 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
720 * statement so the compiler knows explicitly to check this case first.
721 * For the Optimized ALUA access state case, we want to process the
722 * incoming fabric cmd ASAP..
723 */
724 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
725 return 0;
726
727 switch (out_alua_state) {
728 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
729 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
730 break;
731 case ALUA_ACCESS_STATE_STANDBY:
732 if (core_alua_state_standby(cmd, cdb))
733 return TCM_CHECK_CONDITION_NOT_READY;
734 break;
735 case ALUA_ACCESS_STATE_UNAVAILABLE:
736 if (core_alua_state_unavailable(cmd, cdb))
737 return TCM_CHECK_CONDITION_NOT_READY;
738 break;
739 case ALUA_ACCESS_STATE_TRANSITION:
740 if (core_alua_state_transition(cmd, cdb))
741 return TCM_CHECK_CONDITION_NOT_READY;
742 break;
743 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
744 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
745 return TCM_CHECK_CONDITION_NOT_READY;
746 break;
747 /*
748 * OFFLINE is a secondary ALUA target port group access state, that is
749 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
750 */
751 case ALUA_ACCESS_STATE_OFFLINE:
752 default:
753 pr_err("Unknown ALUA access state: 0x%02x\n",
754 out_alua_state);
755 return TCM_INVALID_CDB_FIELD;
756 }
757
758 return 0;
759 }
760
761 /*
762 * Check implicit and explicit ALUA state change request.
763 */
764 static sense_reason_t
765 core_alua_check_transition(int state, int valid, int *primary)
766 {
767 /*
768 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
769 * defined as primary target port asymmetric access states.
770 */
771 switch (state) {
772 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
773 if (!(valid & ALUA_AO_SUP))
774 goto not_supported;
775 *primary = 1;
776 break;
777 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
778 if (!(valid & ALUA_AN_SUP))
779 goto not_supported;
780 *primary = 1;
781 break;
782 case ALUA_ACCESS_STATE_STANDBY:
783 if (!(valid & ALUA_S_SUP))
784 goto not_supported;
785 *primary = 1;
786 break;
787 case ALUA_ACCESS_STATE_UNAVAILABLE:
788 if (!(valid & ALUA_U_SUP))
789 goto not_supported;
790 *primary = 1;
791 break;
792 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
793 if (!(valid & ALUA_LBD_SUP))
794 goto not_supported;
795 *primary = 1;
796 break;
797 case ALUA_ACCESS_STATE_OFFLINE:
798 /*
799 * OFFLINE state is defined as a secondary target port
800 * asymmetric access state.
801 */
802 if (!(valid & ALUA_O_SUP))
803 goto not_supported;
804 *primary = 0;
805 break;
806 case ALUA_ACCESS_STATE_TRANSITION:
807 /*
808 * Transitioning is set internally, and
809 * cannot be selected manually.
810 */
811 goto not_supported;
812 default:
813 pr_err("Unknown ALUA access state: 0x%02x\n", state);
814 return TCM_INVALID_PARAMETER_LIST;
815 }
816
817 return 0;
818
819 not_supported:
820 pr_err("ALUA access state %s not supported",
821 core_alua_dump_state(state));
822 return TCM_INVALID_PARAMETER_LIST;
823 }
824
825 static char *core_alua_dump_state(int state)
826 {
827 switch (state) {
828 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
829 return "Active/Optimized";
830 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
831 return "Active/NonOptimized";
832 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
833 return "LBA Dependent";
834 case ALUA_ACCESS_STATE_STANDBY:
835 return "Standby";
836 case ALUA_ACCESS_STATE_UNAVAILABLE:
837 return "Unavailable";
838 case ALUA_ACCESS_STATE_OFFLINE:
839 return "Offline";
840 case ALUA_ACCESS_STATE_TRANSITION:
841 return "Transitioning";
842 default:
843 return "Unknown";
844 }
845
846 return NULL;
847 }
848
849 char *core_alua_dump_status(int status)
850 {
851 switch (status) {
852 case ALUA_STATUS_NONE:
853 return "None";
854 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
855 return "Altered by Explicit STPG";
856 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
857 return "Altered by Implicit ALUA";
858 default:
859 return "Unknown";
860 }
861
862 return NULL;
863 }
864
865 /*
866 * Used by fabric modules to determine when we need to delay processing
867 * for the Active/NonOptimized paths..
868 */
869 int core_alua_check_nonop_delay(
870 struct se_cmd *cmd)
871 {
872 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
873 return 0;
874 if (in_interrupt())
875 return 0;
876 /*
877 * The ALUA Active/NonOptimized access state delay can be disabled
878 * in via configfs with a value of zero
879 */
880 if (!cmd->alua_nonop_delay)
881 return 0;
882 /*
883 * struct se_cmd->alua_nonop_delay gets set by a target port group
884 * defined interval in core_alua_state_nonoptimized()
885 */
886 msleep_interruptible(cmd->alua_nonop_delay);
887 return 0;
888 }
889 EXPORT_SYMBOL(core_alua_check_nonop_delay);
890
891 static int core_alua_write_tpg_metadata(
892 const char *path,
893 unsigned char *md_buf,
894 u32 md_buf_len)
895 {
896 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
897 int ret;
898
899 if (IS_ERR(file)) {
900 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
901 return -ENODEV;
902 }
903 ret = kernel_write(file, md_buf, md_buf_len, 0);
904 if (ret < 0)
905 pr_err("Error writing ALUA metadata file: %s\n", path);
906 fput(file);
907 return (ret < 0) ? -EIO : 0;
908 }
909
910 /*
911 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
912 */
913 static int core_alua_update_tpg_primary_metadata(
914 struct t10_alua_tg_pt_gp *tg_pt_gp)
915 {
916 unsigned char *md_buf;
917 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
918 char path[ALUA_METADATA_PATH_LEN];
919 int len, rc;
920
921 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
922 if (!md_buf) {
923 pr_err("Unable to allocate buf for ALUA metadata\n");
924 return -ENOMEM;
925 }
926
927 memset(path, 0, ALUA_METADATA_PATH_LEN);
928
929 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
930 "tg_pt_gp_id=%hu\n"
931 "alua_access_state=0x%02x\n"
932 "alua_access_status=0x%02x\n",
933 tg_pt_gp->tg_pt_gp_id,
934 tg_pt_gp->tg_pt_gp_alua_pending_state,
935 tg_pt_gp->tg_pt_gp_alua_access_status);
936
937 snprintf(path, ALUA_METADATA_PATH_LEN,
938 "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0],
939 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
940
941 rc = core_alua_write_tpg_metadata(path, md_buf, len);
942 kfree(md_buf);
943 return rc;
944 }
945
946 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
947 {
948 struct se_dev_entry *se_deve;
949 struct se_lun *lun;
950 struct se_lun_acl *lacl;
951
952 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
953 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
954 lun_tg_pt_gp_link) {
955 /*
956 * After an implicit target port asymmetric access state
957 * change, a device server shall establish a unit attention
958 * condition for the initiator port associated with every I_T
959 * nexus with the additional sense code set to ASYMMETRIC
960 * ACCESS STATE CHANGED.
961 *
962 * After an explicit target port asymmetric access state
963 * change, a device server shall establish a unit attention
964 * condition with the additional sense code set to ASYMMETRIC
965 * ACCESS STATE CHANGED for the initiator port associated with
966 * every I_T nexus other than the I_T nexus on which the SET
967 * TARGET PORT GROUPS command
968 */
969 if (!percpu_ref_tryget_live(&lun->lun_ref))
970 continue;
971 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
972
973 spin_lock(&lun->lun_deve_lock);
974 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
975 lacl = rcu_dereference_check(se_deve->se_lun_acl,
976 lockdep_is_held(&lun->lun_deve_lock));
977
978 /*
979 * spc4r37 p.242:
980 * After an explicit target port asymmetric access
981 * state change, a device server shall establish a
982 * unit attention condition with the additional sense
983 * code set to ASYMMETRIC ACCESS STATE CHANGED for
984 * the initiator port associated with every I_T nexus
985 * other than the I_T nexus on which the SET TARGET
986 * PORT GROUPS command was received.
987 */
988 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
989 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
990 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
991 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
992 continue;
993
994 /*
995 * se_deve->se_lun_acl pointer may be NULL for a
996 * entry created without explicit Node+MappedLUN ACLs
997 */
998 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
999 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
1000 continue;
1001
1002 core_scsi3_ua_allocate(se_deve, 0x2A,
1003 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1004 }
1005 spin_unlock(&lun->lun_deve_lock);
1006
1007 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1008 percpu_ref_put(&lun->lun_ref);
1009 }
1010 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1011 }
1012
1013 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
1014 {
1015 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
1016 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
1017 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1018 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
1019 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
1020
1021 /*
1022 * Update the ALUA metadata buf that has been allocated in
1023 * core_alua_do_port_transition(), this metadata will be written
1024 * to struct file.
1025 *
1026 * Note that there is the case where we do not want to update the
1027 * metadata when the saved metadata is being parsed in userspace
1028 * when setting the existing port access state and access status.
1029 *
1030 * Also note that the failure to write out the ALUA metadata to
1031 * struct file does NOT affect the actual ALUA transition.
1032 */
1033 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1034 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1035 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1036 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1037 }
1038 /*
1039 * Set the current primary ALUA access state to the requested new state
1040 */
1041 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1042 tg_pt_gp->tg_pt_gp_alua_pending_state);
1043
1044 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1045 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1046 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1047 tg_pt_gp->tg_pt_gp_id,
1048 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1049 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1050
1051 core_alua_queue_state_change_ua(tg_pt_gp);
1052
1053 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1054 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1055 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1056
1057 if (tg_pt_gp->tg_pt_gp_transition_complete)
1058 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1059 }
1060
1061 static int core_alua_do_transition_tg_pt(
1062 struct t10_alua_tg_pt_gp *tg_pt_gp,
1063 int new_state,
1064 int explicit)
1065 {
1066 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1067 DECLARE_COMPLETION_ONSTACK(wait);
1068
1069 /* Nothing to be done here */
1070 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1071 return 0;
1072
1073 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1074 return -EAGAIN;
1075
1076 /*
1077 * Flush any pending transitions
1078 */
1079 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1080 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1081 ALUA_ACCESS_STATE_TRANSITION) {
1082 /* Just in case */
1083 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1084 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1085 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1086 wait_for_completion(&wait);
1087 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1088 return 0;
1089 }
1090
1091 /*
1092 * Save the old primary ALUA access state, and set the current state
1093 * to ALUA_ACCESS_STATE_TRANSITION.
1094 */
1095 tg_pt_gp->tg_pt_gp_alua_previous_state =
1096 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1097 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1098
1099 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1100 ALUA_ACCESS_STATE_TRANSITION);
1101 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1102 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1103 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1104
1105 core_alua_queue_state_change_ua(tg_pt_gp);
1106
1107 /*
1108 * Check for the optional ALUA primary state transition delay
1109 */
1110 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1111 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1112
1113 /*
1114 * Take a reference for workqueue item
1115 */
1116 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1117 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1118 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1119
1120 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1121 unsigned long transition_tmo;
1122
1123 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1124 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1125 &tg_pt_gp->tg_pt_gp_transition_work,
1126 transition_tmo);
1127 } else {
1128 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1129 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1130 &tg_pt_gp->tg_pt_gp_transition_work, 0);
1131 wait_for_completion(&wait);
1132 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1133 }
1134
1135 return 0;
1136 }
1137
1138 int core_alua_do_port_transition(
1139 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1140 struct se_device *l_dev,
1141 struct se_lun *l_lun,
1142 struct se_node_acl *l_nacl,
1143 int new_state,
1144 int explicit)
1145 {
1146 struct se_device *dev;
1147 struct t10_alua_lu_gp *lu_gp;
1148 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1149 struct t10_alua_tg_pt_gp *tg_pt_gp;
1150 int primary, valid_states, rc = 0;
1151
1152 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1153 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1154 return -EINVAL;
1155
1156 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1157 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1158 lu_gp = local_lu_gp_mem->lu_gp;
1159 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1160 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1161 /*
1162 * For storage objects that are members of the 'default_lu_gp',
1163 * we only do transition on the passed *l_tp_pt_gp, and not
1164 * on all of the matching target port groups IDs in default_lu_gp.
1165 */
1166 if (!lu_gp->lu_gp_id) {
1167 /*
1168 * core_alua_do_transition_tg_pt() will always return
1169 * success.
1170 */
1171 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1172 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1173 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1174 new_state, explicit);
1175 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1176 return rc;
1177 }
1178 /*
1179 * For all other LU groups aside from 'default_lu_gp', walk all of
1180 * the associated storage objects looking for a matching target port
1181 * group ID from the local target port group.
1182 */
1183 spin_lock(&lu_gp->lu_gp_lock);
1184 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1185 lu_gp_mem_list) {
1186
1187 dev = lu_gp_mem->lu_gp_mem_dev;
1188 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1189 spin_unlock(&lu_gp->lu_gp_lock);
1190
1191 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1192 list_for_each_entry(tg_pt_gp,
1193 &dev->t10_alua.tg_pt_gps_list,
1194 tg_pt_gp_list) {
1195
1196 if (!tg_pt_gp->tg_pt_gp_valid_id)
1197 continue;
1198 /*
1199 * If the target behavior port asymmetric access state
1200 * is changed for any target port group accessible via
1201 * a logical unit within a LU group, the target port
1202 * behavior group asymmetric access states for the same
1203 * target port group accessible via other logical units
1204 * in that LU group will also change.
1205 */
1206 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1207 continue;
1208
1209 if (l_tg_pt_gp == tg_pt_gp) {
1210 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1211 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1212 } else {
1213 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1214 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1215 }
1216 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1217 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1218 /*
1219 * core_alua_do_transition_tg_pt() will always return
1220 * success.
1221 */
1222 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1223 new_state, explicit);
1224
1225 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1226 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1227 if (rc)
1228 break;
1229 }
1230 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1231
1232 spin_lock(&lu_gp->lu_gp_lock);
1233 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1234 }
1235 spin_unlock(&lu_gp->lu_gp_lock);
1236
1237 if (!rc) {
1238 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1239 " Group IDs: %hu %s transition to primary state: %s\n",
1240 config_item_name(&lu_gp->lu_gp_group.cg_item),
1241 l_tg_pt_gp->tg_pt_gp_id,
1242 (explicit) ? "explicit" : "implicit",
1243 core_alua_dump_state(new_state));
1244 }
1245
1246 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1247 return rc;
1248 }
1249
1250 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1251 {
1252 struct se_portal_group *se_tpg = lun->lun_tpg;
1253 unsigned char *md_buf;
1254 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1255 int len, rc;
1256
1257 mutex_lock(&lun->lun_tg_pt_md_mutex);
1258
1259 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1260 if (!md_buf) {
1261 pr_err("Unable to allocate buf for ALUA metadata\n");
1262 rc = -ENOMEM;
1263 goto out_unlock;
1264 }
1265
1266 memset(path, 0, ALUA_METADATA_PATH_LEN);
1267 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1268
1269 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1270 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1271
1272 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1273 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1274 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1275
1276 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1277 "alua_tg_pt_status=0x%02x\n",
1278 atomic_read(&lun->lun_tg_pt_secondary_offline),
1279 lun->lun_tg_pt_secondary_stat);
1280
1281 snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu",
1282 db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1283 lun->unpacked_lun);
1284
1285 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1286 kfree(md_buf);
1287
1288 out_unlock:
1289 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1290 return rc;
1291 }
1292
1293 static int core_alua_set_tg_pt_secondary_state(
1294 struct se_lun *lun,
1295 int explicit,
1296 int offline)
1297 {
1298 struct t10_alua_tg_pt_gp *tg_pt_gp;
1299 int trans_delay_msecs;
1300
1301 spin_lock(&lun->lun_tg_pt_gp_lock);
1302 tg_pt_gp = lun->lun_tg_pt_gp;
1303 if (!tg_pt_gp) {
1304 spin_unlock(&lun->lun_tg_pt_gp_lock);
1305 pr_err("Unable to complete secondary state"
1306 " transition\n");
1307 return -EINVAL;
1308 }
1309 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1310 /*
1311 * Set the secondary ALUA target port access state to OFFLINE
1312 * or release the previously secondary state for struct se_lun
1313 */
1314 if (offline)
1315 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1316 else
1317 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1318
1319 lun->lun_tg_pt_secondary_stat = (explicit) ?
1320 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1321 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1322
1323 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1324 " to secondary access state: %s\n", (explicit) ? "explicit" :
1325 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1326 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1327
1328 spin_unlock(&lun->lun_tg_pt_gp_lock);
1329 /*
1330 * Do the optional transition delay after we set the secondary
1331 * ALUA access state.
1332 */
1333 if (trans_delay_msecs != 0)
1334 msleep_interruptible(trans_delay_msecs);
1335 /*
1336 * See if we need to update the ALUA fabric port metadata for
1337 * secondary state and status
1338 */
1339 if (lun->lun_tg_pt_secondary_write_md)
1340 core_alua_update_tpg_secondary_metadata(lun);
1341
1342 return 0;
1343 }
1344
1345 struct t10_alua_lba_map *
1346 core_alua_allocate_lba_map(struct list_head *list,
1347 u64 first_lba, u64 last_lba)
1348 {
1349 struct t10_alua_lba_map *lba_map;
1350
1351 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1352 if (!lba_map) {
1353 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1354 return ERR_PTR(-ENOMEM);
1355 }
1356 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1357 lba_map->lba_map_first_lba = first_lba;
1358 lba_map->lba_map_last_lba = last_lba;
1359
1360 list_add_tail(&lba_map->lba_map_list, list);
1361 return lba_map;
1362 }
1363
1364 int
1365 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1366 int pg_id, int state)
1367 {
1368 struct t10_alua_lba_map_member *lba_map_mem;
1369
1370 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1371 lba_map_mem_list) {
1372 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1373 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1374 return -EINVAL;
1375 }
1376 }
1377
1378 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1379 if (!lba_map_mem) {
1380 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1381 return -ENOMEM;
1382 }
1383 lba_map_mem->lba_map_mem_alua_state = state;
1384 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1385
1386 list_add_tail(&lba_map_mem->lba_map_mem_list,
1387 &lba_map->lba_map_mem_list);
1388 return 0;
1389 }
1390
1391 void
1392 core_alua_free_lba_map(struct list_head *lba_list)
1393 {
1394 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1395 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1396
1397 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1398 lba_map_list) {
1399 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1400 &lba_map->lba_map_mem_list,
1401 lba_map_mem_list) {
1402 list_del(&lba_map_mem->lba_map_mem_list);
1403 kmem_cache_free(t10_alua_lba_map_mem_cache,
1404 lba_map_mem);
1405 }
1406 list_del(&lba_map->lba_map_list);
1407 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1408 }
1409 }
1410
1411 void
1412 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1413 int segment_size, int segment_mult)
1414 {
1415 struct list_head old_lba_map_list;
1416 struct t10_alua_tg_pt_gp *tg_pt_gp;
1417 int activate = 0, supported;
1418
1419 INIT_LIST_HEAD(&old_lba_map_list);
1420 spin_lock(&dev->t10_alua.lba_map_lock);
1421 dev->t10_alua.lba_map_segment_size = segment_size;
1422 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1423 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1424 if (lba_map_list) {
1425 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1426 activate = 1;
1427 }
1428 spin_unlock(&dev->t10_alua.lba_map_lock);
1429 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1430 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1431 tg_pt_gp_list) {
1432
1433 if (!tg_pt_gp->tg_pt_gp_valid_id)
1434 continue;
1435 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1436 if (activate)
1437 supported |= ALUA_LBD_SUP;
1438 else
1439 supported &= ~ALUA_LBD_SUP;
1440 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1441 }
1442 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1443 core_alua_free_lba_map(&old_lba_map_list);
1444 }
1445
1446 struct t10_alua_lu_gp *
1447 core_alua_allocate_lu_gp(const char *name, int def_group)
1448 {
1449 struct t10_alua_lu_gp *lu_gp;
1450
1451 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1452 if (!lu_gp) {
1453 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1454 return ERR_PTR(-ENOMEM);
1455 }
1456 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1457 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1458 spin_lock_init(&lu_gp->lu_gp_lock);
1459 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1460
1461 if (def_group) {
1462 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1463 lu_gp->lu_gp_valid_id = 1;
1464 alua_lu_gps_count++;
1465 }
1466
1467 return lu_gp;
1468 }
1469
1470 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1471 {
1472 struct t10_alua_lu_gp *lu_gp_tmp;
1473 u16 lu_gp_id_tmp;
1474 /*
1475 * The lu_gp->lu_gp_id may only be set once..
1476 */
1477 if (lu_gp->lu_gp_valid_id) {
1478 pr_warn("ALUA LU Group already has a valid ID,"
1479 " ignoring request\n");
1480 return -EINVAL;
1481 }
1482
1483 spin_lock(&lu_gps_lock);
1484 if (alua_lu_gps_count == 0x0000ffff) {
1485 pr_err("Maximum ALUA alua_lu_gps_count:"
1486 " 0x0000ffff reached\n");
1487 spin_unlock(&lu_gps_lock);
1488 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1489 return -ENOSPC;
1490 }
1491 again:
1492 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1493 alua_lu_gps_counter++;
1494
1495 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1496 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1497 if (!lu_gp_id)
1498 goto again;
1499
1500 pr_warn("ALUA Logical Unit Group ID: %hu"
1501 " already exists, ignoring request\n",
1502 lu_gp_id);
1503 spin_unlock(&lu_gps_lock);
1504 return -EINVAL;
1505 }
1506 }
1507
1508 lu_gp->lu_gp_id = lu_gp_id_tmp;
1509 lu_gp->lu_gp_valid_id = 1;
1510 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1511 alua_lu_gps_count++;
1512 spin_unlock(&lu_gps_lock);
1513
1514 return 0;
1515 }
1516
1517 static struct t10_alua_lu_gp_member *
1518 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1519 {
1520 struct t10_alua_lu_gp_member *lu_gp_mem;
1521
1522 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1523 if (!lu_gp_mem) {
1524 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1525 return ERR_PTR(-ENOMEM);
1526 }
1527 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1528 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1529 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1530
1531 lu_gp_mem->lu_gp_mem_dev = dev;
1532 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1533
1534 return lu_gp_mem;
1535 }
1536
1537 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1538 {
1539 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1540 /*
1541 * Once we have reached this point, config_item_put() has
1542 * already been called from target_core_alua_drop_lu_gp().
1543 *
1544 * Here, we remove the *lu_gp from the global list so that
1545 * no associations can be made while we are releasing
1546 * struct t10_alua_lu_gp.
1547 */
1548 spin_lock(&lu_gps_lock);
1549 list_del(&lu_gp->lu_gp_node);
1550 alua_lu_gps_count--;
1551 spin_unlock(&lu_gps_lock);
1552 /*
1553 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1554 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1555 * released with core_alua_put_lu_gp_from_name()
1556 */
1557 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1558 cpu_relax();
1559 /*
1560 * Release reference to struct t10_alua_lu_gp * from all associated
1561 * struct se_device.
1562 */
1563 spin_lock(&lu_gp->lu_gp_lock);
1564 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1565 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1566 if (lu_gp_mem->lu_gp_assoc) {
1567 list_del(&lu_gp_mem->lu_gp_mem_list);
1568 lu_gp->lu_gp_members--;
1569 lu_gp_mem->lu_gp_assoc = 0;
1570 }
1571 spin_unlock(&lu_gp->lu_gp_lock);
1572 /*
1573 *
1574 * lu_gp_mem is associated with a single
1575 * struct se_device->dev_alua_lu_gp_mem, and is released when
1576 * struct se_device is released via core_alua_free_lu_gp_mem().
1577 *
1578 * If the passed lu_gp does NOT match the default_lu_gp, assume
1579 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1580 */
1581 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1582 if (lu_gp != default_lu_gp)
1583 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1584 default_lu_gp);
1585 else
1586 lu_gp_mem->lu_gp = NULL;
1587 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1588
1589 spin_lock(&lu_gp->lu_gp_lock);
1590 }
1591 spin_unlock(&lu_gp->lu_gp_lock);
1592
1593 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1594 }
1595
1596 void core_alua_free_lu_gp_mem(struct se_device *dev)
1597 {
1598 struct t10_alua_lu_gp *lu_gp;
1599 struct t10_alua_lu_gp_member *lu_gp_mem;
1600
1601 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1602 if (!lu_gp_mem)
1603 return;
1604
1605 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1606 cpu_relax();
1607
1608 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1609 lu_gp = lu_gp_mem->lu_gp;
1610 if (lu_gp) {
1611 spin_lock(&lu_gp->lu_gp_lock);
1612 if (lu_gp_mem->lu_gp_assoc) {
1613 list_del(&lu_gp_mem->lu_gp_mem_list);
1614 lu_gp->lu_gp_members--;
1615 lu_gp_mem->lu_gp_assoc = 0;
1616 }
1617 spin_unlock(&lu_gp->lu_gp_lock);
1618 lu_gp_mem->lu_gp = NULL;
1619 }
1620 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1621
1622 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1623 }
1624
1625 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1626 {
1627 struct t10_alua_lu_gp *lu_gp;
1628 struct config_item *ci;
1629
1630 spin_lock(&lu_gps_lock);
1631 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1632 if (!lu_gp->lu_gp_valid_id)
1633 continue;
1634 ci = &lu_gp->lu_gp_group.cg_item;
1635 if (!strcmp(config_item_name(ci), name)) {
1636 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1637 spin_unlock(&lu_gps_lock);
1638 return lu_gp;
1639 }
1640 }
1641 spin_unlock(&lu_gps_lock);
1642
1643 return NULL;
1644 }
1645
1646 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1647 {
1648 spin_lock(&lu_gps_lock);
1649 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1650 spin_unlock(&lu_gps_lock);
1651 }
1652
1653 /*
1654 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1655 */
1656 void __core_alua_attach_lu_gp_mem(
1657 struct t10_alua_lu_gp_member *lu_gp_mem,
1658 struct t10_alua_lu_gp *lu_gp)
1659 {
1660 spin_lock(&lu_gp->lu_gp_lock);
1661 lu_gp_mem->lu_gp = lu_gp;
1662 lu_gp_mem->lu_gp_assoc = 1;
1663 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1664 lu_gp->lu_gp_members++;
1665 spin_unlock(&lu_gp->lu_gp_lock);
1666 }
1667
1668 /*
1669 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1670 */
1671 void __core_alua_drop_lu_gp_mem(
1672 struct t10_alua_lu_gp_member *lu_gp_mem,
1673 struct t10_alua_lu_gp *lu_gp)
1674 {
1675 spin_lock(&lu_gp->lu_gp_lock);
1676 list_del(&lu_gp_mem->lu_gp_mem_list);
1677 lu_gp_mem->lu_gp = NULL;
1678 lu_gp_mem->lu_gp_assoc = 0;
1679 lu_gp->lu_gp_members--;
1680 spin_unlock(&lu_gp->lu_gp_lock);
1681 }
1682
1683 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1684 const char *name, int def_group)
1685 {
1686 struct t10_alua_tg_pt_gp *tg_pt_gp;
1687
1688 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1689 if (!tg_pt_gp) {
1690 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1691 return NULL;
1692 }
1693 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1694 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1695 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1696 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1697 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1698 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1699 core_alua_do_transition_tg_pt_work);
1700 tg_pt_gp->tg_pt_gp_dev = dev;
1701 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1702 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1703 /*
1704 * Enable both explicit and implicit ALUA support by default
1705 */
1706 tg_pt_gp->tg_pt_gp_alua_access_type =
1707 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1708 /*
1709 * Set the default Active/NonOptimized Delay in milliseconds
1710 */
1711 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1712 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1713 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1714
1715 /*
1716 * Enable all supported states
1717 */
1718 tg_pt_gp->tg_pt_gp_alua_supported_states =
1719 ALUA_T_SUP | ALUA_O_SUP |
1720 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1721
1722 if (def_group) {
1723 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1724 tg_pt_gp->tg_pt_gp_id =
1725 dev->t10_alua.alua_tg_pt_gps_counter++;
1726 tg_pt_gp->tg_pt_gp_valid_id = 1;
1727 dev->t10_alua.alua_tg_pt_gps_count++;
1728 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1729 &dev->t10_alua.tg_pt_gps_list);
1730 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1731 }
1732
1733 return tg_pt_gp;
1734 }
1735
1736 int core_alua_set_tg_pt_gp_id(
1737 struct t10_alua_tg_pt_gp *tg_pt_gp,
1738 u16 tg_pt_gp_id)
1739 {
1740 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1741 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1742 u16 tg_pt_gp_id_tmp;
1743
1744 /*
1745 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1746 */
1747 if (tg_pt_gp->tg_pt_gp_valid_id) {
1748 pr_warn("ALUA TG PT Group already has a valid ID,"
1749 " ignoring request\n");
1750 return -EINVAL;
1751 }
1752
1753 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1754 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1755 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1756 " 0x0000ffff reached\n");
1757 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1758 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1759 return -ENOSPC;
1760 }
1761 again:
1762 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1763 dev->t10_alua.alua_tg_pt_gps_counter++;
1764
1765 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1766 tg_pt_gp_list) {
1767 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1768 if (!tg_pt_gp_id)
1769 goto again;
1770
1771 pr_err("ALUA Target Port Group ID: %hu already"
1772 " exists, ignoring request\n", tg_pt_gp_id);
1773 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1774 return -EINVAL;
1775 }
1776 }
1777
1778 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1779 tg_pt_gp->tg_pt_gp_valid_id = 1;
1780 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1781 &dev->t10_alua.tg_pt_gps_list);
1782 dev->t10_alua.alua_tg_pt_gps_count++;
1783 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1784
1785 return 0;
1786 }
1787
1788 void core_alua_free_tg_pt_gp(
1789 struct t10_alua_tg_pt_gp *tg_pt_gp)
1790 {
1791 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1792 struct se_lun *lun, *next;
1793
1794 /*
1795 * Once we have reached this point, config_item_put() has already
1796 * been called from target_core_alua_drop_tg_pt_gp().
1797 *
1798 * Here we remove *tg_pt_gp from the global list so that
1799 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1800 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1801 */
1802 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1803 list_del(&tg_pt_gp->tg_pt_gp_list);
1804 dev->t10_alua.alua_tg_pt_gps_counter--;
1805 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1806
1807 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1808
1809 /*
1810 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1811 * core_alua_get_tg_pt_gp_by_name() in
1812 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1813 * to be released with core_alua_put_tg_pt_gp_from_name().
1814 */
1815 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1816 cpu_relax();
1817
1818 /*
1819 * Release reference to struct t10_alua_tg_pt_gp from all associated
1820 * struct se_port.
1821 */
1822 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1823 list_for_each_entry_safe(lun, next,
1824 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1825 list_del_init(&lun->lun_tg_pt_gp_link);
1826 tg_pt_gp->tg_pt_gp_members--;
1827
1828 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1829 /*
1830 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1831 * assume we want to re-associate a given tg_pt_gp_mem with
1832 * default_tg_pt_gp.
1833 */
1834 spin_lock(&lun->lun_tg_pt_gp_lock);
1835 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1836 __target_attach_tg_pt_gp(lun,
1837 dev->t10_alua.default_tg_pt_gp);
1838 } else
1839 lun->lun_tg_pt_gp = NULL;
1840 spin_unlock(&lun->lun_tg_pt_gp_lock);
1841
1842 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1843 }
1844 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1845
1846 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1847 }
1848
1849 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1850 struct se_device *dev, const char *name)
1851 {
1852 struct t10_alua_tg_pt_gp *tg_pt_gp;
1853 struct config_item *ci;
1854
1855 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1856 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1857 tg_pt_gp_list) {
1858 if (!tg_pt_gp->tg_pt_gp_valid_id)
1859 continue;
1860 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1861 if (!strcmp(config_item_name(ci), name)) {
1862 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1863 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1864 return tg_pt_gp;
1865 }
1866 }
1867 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1868
1869 return NULL;
1870 }
1871
1872 static void core_alua_put_tg_pt_gp_from_name(
1873 struct t10_alua_tg_pt_gp *tg_pt_gp)
1874 {
1875 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1876
1877 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1878 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1879 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1880 }
1881
1882 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1883 struct t10_alua_tg_pt_gp *tg_pt_gp)
1884 {
1885 struct se_dev_entry *se_deve;
1886
1887 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1888
1889 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1890 lun->lun_tg_pt_gp = tg_pt_gp;
1891 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1892 tg_pt_gp->tg_pt_gp_members++;
1893 spin_lock(&lun->lun_deve_lock);
1894 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1895 core_scsi3_ua_allocate(se_deve, 0x3f,
1896 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1897 spin_unlock(&lun->lun_deve_lock);
1898 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1899 }
1900
1901 void target_attach_tg_pt_gp(struct se_lun *lun,
1902 struct t10_alua_tg_pt_gp *tg_pt_gp)
1903 {
1904 spin_lock(&lun->lun_tg_pt_gp_lock);
1905 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1906 spin_unlock(&lun->lun_tg_pt_gp_lock);
1907 }
1908
1909 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1910 struct t10_alua_tg_pt_gp *tg_pt_gp)
1911 {
1912 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1913
1914 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1915 list_del_init(&lun->lun_tg_pt_gp_link);
1916 tg_pt_gp->tg_pt_gp_members--;
1917 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1918
1919 lun->lun_tg_pt_gp = NULL;
1920 }
1921
1922 void target_detach_tg_pt_gp(struct se_lun *lun)
1923 {
1924 struct t10_alua_tg_pt_gp *tg_pt_gp;
1925
1926 spin_lock(&lun->lun_tg_pt_gp_lock);
1927 tg_pt_gp = lun->lun_tg_pt_gp;
1928 if (tg_pt_gp)
1929 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1930 spin_unlock(&lun->lun_tg_pt_gp_lock);
1931 }
1932
1933 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1934 {
1935 struct config_item *tg_pt_ci;
1936 struct t10_alua_tg_pt_gp *tg_pt_gp;
1937 ssize_t len = 0;
1938
1939 spin_lock(&lun->lun_tg_pt_gp_lock);
1940 tg_pt_gp = lun->lun_tg_pt_gp;
1941 if (tg_pt_gp) {
1942 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1943 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1944 " %hu\nTG Port Primary Access State: %s\nTG Port "
1945 "Primary Access Status: %s\nTG Port Secondary Access"
1946 " State: %s\nTG Port Secondary Access Status: %s\n",
1947 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1948 core_alua_dump_state(atomic_read(
1949 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1950 core_alua_dump_status(
1951 tg_pt_gp->tg_pt_gp_alua_access_status),
1952 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1953 "Offline" : "None",
1954 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1955 }
1956 spin_unlock(&lun->lun_tg_pt_gp_lock);
1957
1958 return len;
1959 }
1960
1961 ssize_t core_alua_store_tg_pt_gp_info(
1962 struct se_lun *lun,
1963 const char *page,
1964 size_t count)
1965 {
1966 struct se_portal_group *tpg = lun->lun_tpg;
1967 /*
1968 * rcu_dereference_raw protected by se_lun->lun_group symlink
1969 * reference to se_device->dev_group.
1970 */
1971 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1972 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1973 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1974 int move = 0;
1975
1976 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
1977 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1978 return -ENODEV;
1979
1980 if (count > TG_PT_GROUP_NAME_BUF) {
1981 pr_err("ALUA Target Port Group alias too large!\n");
1982 return -EINVAL;
1983 }
1984 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1985 memcpy(buf, page, count);
1986 /*
1987 * Any ALUA target port group alias besides "NULL" means we will be
1988 * making a new group association.
1989 */
1990 if (strcmp(strstrip(buf), "NULL")) {
1991 /*
1992 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1993 * struct t10_alua_tg_pt_gp. This reference is released with
1994 * core_alua_put_tg_pt_gp_from_name() below.
1995 */
1996 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1997 strstrip(buf));
1998 if (!tg_pt_gp_new)
1999 return -ENODEV;
2000 }
2001
2002 spin_lock(&lun->lun_tg_pt_gp_lock);
2003 tg_pt_gp = lun->lun_tg_pt_gp;
2004 if (tg_pt_gp) {
2005 /*
2006 * Clearing an existing tg_pt_gp association, and replacing
2007 * with the default_tg_pt_gp.
2008 */
2009 if (!tg_pt_gp_new) {
2010 pr_debug("Target_Core_ConfigFS: Moving"
2011 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2012 " alua/%s, ID: %hu back to"
2013 " default_tg_pt_gp\n",
2014 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2015 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2016 config_item_name(&lun->lun_group.cg_item),
2017 config_item_name(
2018 &tg_pt_gp->tg_pt_gp_group.cg_item),
2019 tg_pt_gp->tg_pt_gp_id);
2020
2021 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2022 __target_attach_tg_pt_gp(lun,
2023 dev->t10_alua.default_tg_pt_gp);
2024 spin_unlock(&lun->lun_tg_pt_gp_lock);
2025
2026 return count;
2027 }
2028 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2029 move = 1;
2030 }
2031
2032 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
2033 spin_unlock(&lun->lun_tg_pt_gp_lock);
2034 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2035 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2036 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2037 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2038 config_item_name(&lun->lun_group.cg_item),
2039 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2040 tg_pt_gp_new->tg_pt_gp_id);
2041
2042 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2043 return count;
2044 }
2045
2046 ssize_t core_alua_show_access_type(
2047 struct t10_alua_tg_pt_gp *tg_pt_gp,
2048 char *page)
2049 {
2050 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2051 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2052 return sprintf(page, "Implicit and Explicit\n");
2053 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2054 return sprintf(page, "Implicit\n");
2055 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2056 return sprintf(page, "Explicit\n");
2057 else
2058 return sprintf(page, "None\n");
2059 }
2060
2061 ssize_t core_alua_store_access_type(
2062 struct t10_alua_tg_pt_gp *tg_pt_gp,
2063 const char *page,
2064 size_t count)
2065 {
2066 unsigned long tmp;
2067 int ret;
2068
2069 ret = kstrtoul(page, 0, &tmp);
2070 if (ret < 0) {
2071 pr_err("Unable to extract alua_access_type\n");
2072 return ret;
2073 }
2074 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2075 pr_err("Illegal value for alua_access_type:"
2076 " %lu\n", tmp);
2077 return -EINVAL;
2078 }
2079 if (tmp == 3)
2080 tg_pt_gp->tg_pt_gp_alua_access_type =
2081 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2082 else if (tmp == 2)
2083 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2084 else if (tmp == 1)
2085 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2086 else
2087 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2088
2089 return count;
2090 }
2091
2092 ssize_t core_alua_show_nonop_delay_msecs(
2093 struct t10_alua_tg_pt_gp *tg_pt_gp,
2094 char *page)
2095 {
2096 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2097 }
2098
2099 ssize_t core_alua_store_nonop_delay_msecs(
2100 struct t10_alua_tg_pt_gp *tg_pt_gp,
2101 const char *page,
2102 size_t count)
2103 {
2104 unsigned long tmp;
2105 int ret;
2106
2107 ret = kstrtoul(page, 0, &tmp);
2108 if (ret < 0) {
2109 pr_err("Unable to extract nonop_delay_msecs\n");
2110 return ret;
2111 }
2112 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2113 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2114 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2115 ALUA_MAX_NONOP_DELAY_MSECS);
2116 return -EINVAL;
2117 }
2118 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2119
2120 return count;
2121 }
2122
2123 ssize_t core_alua_show_trans_delay_msecs(
2124 struct t10_alua_tg_pt_gp *tg_pt_gp,
2125 char *page)
2126 {
2127 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2128 }
2129
2130 ssize_t core_alua_store_trans_delay_msecs(
2131 struct t10_alua_tg_pt_gp *tg_pt_gp,
2132 const char *page,
2133 size_t count)
2134 {
2135 unsigned long tmp;
2136 int ret;
2137
2138 ret = kstrtoul(page, 0, &tmp);
2139 if (ret < 0) {
2140 pr_err("Unable to extract trans_delay_msecs\n");
2141 return ret;
2142 }
2143 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2144 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2145 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2146 ALUA_MAX_TRANS_DELAY_MSECS);
2147 return -EINVAL;
2148 }
2149 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2150
2151 return count;
2152 }
2153
2154 ssize_t core_alua_show_implicit_trans_secs(
2155 struct t10_alua_tg_pt_gp *tg_pt_gp,
2156 char *page)
2157 {
2158 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2159 }
2160
2161 ssize_t core_alua_store_implicit_trans_secs(
2162 struct t10_alua_tg_pt_gp *tg_pt_gp,
2163 const char *page,
2164 size_t count)
2165 {
2166 unsigned long tmp;
2167 int ret;
2168
2169 ret = kstrtoul(page, 0, &tmp);
2170 if (ret < 0) {
2171 pr_err("Unable to extract implicit_trans_secs\n");
2172 return ret;
2173 }
2174 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2175 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2176 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2177 ALUA_MAX_IMPLICIT_TRANS_SECS);
2178 return -EINVAL;
2179 }
2180 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2181
2182 return count;
2183 }
2184
2185 ssize_t core_alua_show_preferred_bit(
2186 struct t10_alua_tg_pt_gp *tg_pt_gp,
2187 char *page)
2188 {
2189 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2190 }
2191
2192 ssize_t core_alua_store_preferred_bit(
2193 struct t10_alua_tg_pt_gp *tg_pt_gp,
2194 const char *page,
2195 size_t count)
2196 {
2197 unsigned long tmp;
2198 int ret;
2199
2200 ret = kstrtoul(page, 0, &tmp);
2201 if (ret < 0) {
2202 pr_err("Unable to extract preferred ALUA value\n");
2203 return ret;
2204 }
2205 if ((tmp != 0) && (tmp != 1)) {
2206 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2207 return -EINVAL;
2208 }
2209 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2210
2211 return count;
2212 }
2213
2214 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2215 {
2216 return sprintf(page, "%d\n",
2217 atomic_read(&lun->lun_tg_pt_secondary_offline));
2218 }
2219
2220 ssize_t core_alua_store_offline_bit(
2221 struct se_lun *lun,
2222 const char *page,
2223 size_t count)
2224 {
2225 /*
2226 * rcu_dereference_raw protected by se_lun->lun_group symlink
2227 * reference to se_device->dev_group.
2228 */
2229 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2230 unsigned long tmp;
2231 int ret;
2232
2233 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
2234 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2235 return -ENODEV;
2236
2237 ret = kstrtoul(page, 0, &tmp);
2238 if (ret < 0) {
2239 pr_err("Unable to extract alua_tg_pt_offline value\n");
2240 return ret;
2241 }
2242 if ((tmp != 0) && (tmp != 1)) {
2243 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2244 tmp);
2245 return -EINVAL;
2246 }
2247
2248 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2249 if (ret < 0)
2250 return -EINVAL;
2251
2252 return count;
2253 }
2254
2255 ssize_t core_alua_show_secondary_status(
2256 struct se_lun *lun,
2257 char *page)
2258 {
2259 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2260 }
2261
2262 ssize_t core_alua_store_secondary_status(
2263 struct se_lun *lun,
2264 const char *page,
2265 size_t count)
2266 {
2267 unsigned long tmp;
2268 int ret;
2269
2270 ret = kstrtoul(page, 0, &tmp);
2271 if (ret < 0) {
2272 pr_err("Unable to extract alua_tg_pt_status\n");
2273 return ret;
2274 }
2275 if ((tmp != ALUA_STATUS_NONE) &&
2276 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2277 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2278 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2279 tmp);
2280 return -EINVAL;
2281 }
2282 lun->lun_tg_pt_secondary_stat = (int)tmp;
2283
2284 return count;
2285 }
2286
2287 ssize_t core_alua_show_secondary_write_metadata(
2288 struct se_lun *lun,
2289 char *page)
2290 {
2291 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2292 }
2293
2294 ssize_t core_alua_store_secondary_write_metadata(
2295 struct se_lun *lun,
2296 const char *page,
2297 size_t count)
2298 {
2299 unsigned long tmp;
2300 int ret;
2301
2302 ret = kstrtoul(page, 0, &tmp);
2303 if (ret < 0) {
2304 pr_err("Unable to extract alua_tg_pt_write_md\n");
2305 return ret;
2306 }
2307 if ((tmp != 0) && (tmp != 1)) {
2308 pr_err("Illegal value for alua_tg_pt_write_md:"
2309 " %lu\n", tmp);
2310 return -EINVAL;
2311 }
2312 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2313
2314 return count;
2315 }
2316
2317 int core_setup_alua(struct se_device *dev)
2318 {
2319 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2320 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2321 struct t10_alua_lu_gp_member *lu_gp_mem;
2322
2323 /*
2324 * Associate this struct se_device with the default ALUA
2325 * LUN Group.
2326 */
2327 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2328 if (IS_ERR(lu_gp_mem))
2329 return PTR_ERR(lu_gp_mem);
2330
2331 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2332 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2333 default_lu_gp);
2334 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2335
2336 pr_debug("%s: Adding to default ALUA LU Group:"
2337 " core/alua/lu_gps/default_lu_gp\n",
2338 dev->transport->name);
2339 }
2340
2341 return 0;
2342 }
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