?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / target / target_core_alua.c
blob49aba4a31747c275dd51ab057808ec2b60202ca9
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/export.h>
30 #include <linux/file.h>
31 #include <scsi/scsi_proto.h>
32 #include <asm/unaligned.h>
33
34 #include <target/target_core_base.h>
35 #include <target/target_core_backend.h>
36 #include <target/target_core_fabric.h>
37
38 #include "target_core_internal.h"
39 #include "target_core_alua.h"
40 #include "target_core_ua.h"
41
42 static sense_reason_t core_alua_check_transition(int state, int valid,
43 int *primary);
44 static int core_alua_set_tg_pt_secondary_state(
45 struct se_lun *lun, int explicit, int offline);
46
47 static char *core_alua_dump_state(int state);
48
49 static void __target_attach_tg_pt_gp(struct se_lun *lun,
50 struct t10_alua_tg_pt_gp *tg_pt_gp);
51
52 static u16 alua_lu_gps_counter;
53 static u32 alua_lu_gps_count;
54
55 static DEFINE_SPINLOCK(lu_gps_lock);
56 static LIST_HEAD(lu_gps_list);
57
58 struct t10_alua_lu_gp *default_lu_gp;
59
60 /*
61 * REPORT REFERRALS
62 *
63 * See sbc3r35 section 5.23
64 */
65 sense_reason_t
66 target_emulate_report_referrals(struct se_cmd *cmd)
67 {
68 struct se_device *dev = cmd->se_dev;
69 struct t10_alua_lba_map *map;
70 struct t10_alua_lba_map_member *map_mem;
71 unsigned char *buf;
72 u32 rd_len = 0, off;
73
74 if (cmd->data_length < 4) {
75 pr_warn("REPORT REFERRALS allocation length %u too"
76 " small\n", cmd->data_length);
77 return TCM_INVALID_CDB_FIELD;
78 }
79
80 buf = transport_kmap_data_sg(cmd);
81 if (!buf)
82 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
83
84 off = 4;
85 spin_lock(&dev->t10_alua.lba_map_lock);
86 if (list_empty(&dev->t10_alua.lba_map_list)) {
87 spin_unlock(&dev->t10_alua.lba_map_lock);
88 transport_kunmap_data_sg(cmd);
89
90 return TCM_UNSUPPORTED_SCSI_OPCODE;
91 }
92
93 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
94 lba_map_list) {
95 int desc_num = off + 3;
96 int pg_num;
97
98 off += 4;
99 if (cmd->data_length > off)
100 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
101 off += 8;
102 if (cmd->data_length > off)
103 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
104 off += 8;
105 rd_len += 20;
106 pg_num = 0;
107 list_for_each_entry(map_mem, &map->lba_map_mem_list,
108 lba_map_mem_list) {
109 int alua_state = map_mem->lba_map_mem_alua_state;
110 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
111
112 if (cmd->data_length > off)
113 buf[off] = alua_state & 0x0f;
114 off += 2;
115 if (cmd->data_length > off)
116 buf[off] = (alua_pg_id >> 8) & 0xff;
117 off++;
118 if (cmd->data_length > off)
119 buf[off] = (alua_pg_id & 0xff);
120 off++;
121 rd_len += 4;
122 pg_num++;
123 }
124 if (cmd->data_length > desc_num)
125 buf[desc_num] = pg_num;
126 }
127 spin_unlock(&dev->t10_alua.lba_map_lock);
128
129 /*
130 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
131 */
132 put_unaligned_be16(rd_len, &buf[2]);
133
134 transport_kunmap_data_sg(cmd);
135
136 target_complete_cmd(cmd, GOOD);
137 return 0;
138 }
139
140 /*
141 * REPORT_TARGET_PORT_GROUPS
142 *
143 * See spc4r17 section 6.27
144 */
145 sense_reason_t
146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
147 {
148 struct se_device *dev = cmd->se_dev;
149 struct t10_alua_tg_pt_gp *tg_pt_gp;
150 struct se_lun *lun;
151 unsigned char *buf;
152 u32 rd_len = 0, off;
153 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
154
155 /*
156 * Skip over RESERVED area to first Target port group descriptor
157 * depending on the PARAMETER DATA FORMAT type..
158 */
159 if (ext_hdr != 0)
160 off = 8;
161 else
162 off = 4;
163
164 if (cmd->data_length < off) {
165 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
166 " small for %s header\n", cmd->data_length,
167 (ext_hdr) ? "extended" : "normal");
168 return TCM_INVALID_CDB_FIELD;
169 }
170 buf = transport_kmap_data_sg(cmd);
171 if (!buf)
172 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
173
174 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
175 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
176 tg_pt_gp_list) {
177 /*
178 * Check if the Target port group and Target port descriptor list
179 * based on tg_pt_gp_members count will fit into the response payload.
180 * Otherwise, bump rd_len to let the initiator know we have exceeded
181 * the allocation length and the response is truncated.
182 */
183 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
184 cmd->data_length) {
185 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
186 continue;
187 }
188 /*
189 * PREF: Preferred target port bit, determine if this
190 * bit should be set for port group.
191 */
192 if (tg_pt_gp->tg_pt_gp_pref)
193 buf[off] = 0x80;
194 /*
195 * Set the ASYMMETRIC ACCESS State
196 */
197 buf[off++] |= (atomic_read(
198 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
199 /*
200 * Set supported ASYMMETRIC ACCESS State bits
201 */
202 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
203 /*
204 * TARGET PORT GROUP
205 */
206 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
207 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
208
209 off++; /* Skip over Reserved */
210 /*
211 * STATUS CODE
212 */
213 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
214 /*
215 * Vendor Specific field
216 */
217 buf[off++] = 0x00;
218 /*
219 * TARGET PORT COUNT
220 */
221 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
222 rd_len += 8;
223
224 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
225 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
226 lun_tg_pt_gp_link) {
227 /*
228 * Start Target Port descriptor format
229 *
230 * See spc4r17 section 6.2.7 Table 247
231 */
232 off += 2; /* Skip over Obsolete */
233 /*
234 * Set RELATIVE TARGET PORT IDENTIFIER
235 */
236 buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
237 buf[off++] = (lun->lun_rtpi & 0xff);
238 rd_len += 4;
239 }
240 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
241 }
242 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
243 /*
244 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
245 */
246 put_unaligned_be32(rd_len, &buf[0]);
247
248 /*
249 * Fill in the Extended header parameter data format if requested
250 */
251 if (ext_hdr != 0) {
252 buf[4] = 0x10;
253 /*
254 * Set the implicit transition time (in seconds) for the application
255 * client to use as a base for it's transition timeout value.
256 *
257 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
258 * this CDB was received upon to determine this value individually
259 * for ALUA target port group.
260 */
261 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
262 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
263 if (tg_pt_gp)
264 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
265 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
266 }
267 transport_kunmap_data_sg(cmd);
268
269 target_complete_cmd(cmd, GOOD);
270 return 0;
271 }
272
273 /*
274 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
275 *
276 * See spc4r17 section 6.35
277 */
278 sense_reason_t
279 target_emulate_set_target_port_groups(struct se_cmd *cmd)
280 {
281 struct se_device *dev = cmd->se_dev;
282 struct se_lun *l_lun = cmd->se_lun;
283 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
284 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
285 unsigned char *buf;
286 unsigned char *ptr;
287 sense_reason_t rc = TCM_NO_SENSE;
288 u32 len = 4; /* Skip over RESERVED area in header */
289 int alua_access_state, primary = 0, valid_states;
290 u16 tg_pt_id, rtpi;
291
292 if (cmd->data_length < 4) {
293 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
294 " small\n", cmd->data_length);
295 return TCM_INVALID_PARAMETER_LIST;
296 }
297
298 buf = transport_kmap_data_sg(cmd);
299 if (!buf)
300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
301
302 /*
303 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
304 * for the local tg_pt_gp.
305 */
306 spin_lock(&l_lun->lun_tg_pt_gp_lock);
307 l_tg_pt_gp = l_lun->lun_tg_pt_gp;
308 if (!l_tg_pt_gp) {
309 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
310 pr_err("Unable to access l_lun->tg_pt_gp\n");
311 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
312 goto out;
313 }
314
315 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
316 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
317 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
318 " while TPGS_EXPLICIT_ALUA is disabled\n");
319 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
320 goto out;
321 }
322 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
323 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
324
325 ptr = &buf[4]; /* Skip over RESERVED area in header */
326
327 while (len < cmd->data_length) {
328 bool found = false;
329 alua_access_state = (ptr[0] & 0x0f);
330 /*
331 * Check the received ALUA access state, and determine if
332 * the state is a primary or secondary target port asymmetric
333 * access state.
334 */
335 rc = core_alua_check_transition(alua_access_state,
336 valid_states, &primary);
337 if (rc) {
338 /*
339 * If the SET TARGET PORT GROUPS attempts to establish
340 * an invalid combination of target port asymmetric
341 * access states or attempts to establish an
342 * unsupported target port asymmetric access state,
343 * then the command shall be terminated with CHECK
344 * CONDITION status, with the sense key set to ILLEGAL
345 * REQUEST, and the additional sense code set to INVALID
346 * FIELD IN PARAMETER LIST.
347 */
348 goto out;
349 }
350
351 /*
352 * If the ASYMMETRIC ACCESS STATE field (see table 267)
353 * specifies a primary target port asymmetric access state,
354 * then the TARGET PORT GROUP OR TARGET PORT field specifies
355 * a primary target port group for which the primary target
356 * port asymmetric access state shall be changed. If the
357 * ASYMMETRIC ACCESS STATE field specifies a secondary target
358 * port asymmetric access state, then the TARGET PORT GROUP OR
359 * TARGET PORT field specifies the relative target port
360 * identifier (see 3.1.120) of the target port for which the
361 * secondary target port asymmetric access state shall be
362 * changed.
363 */
364 if (primary) {
365 tg_pt_id = get_unaligned_be16(ptr + 2);
366 /*
367 * Locate the matching target port group ID from
368 * the global tg_pt_gp list
369 */
370 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
371 list_for_each_entry(tg_pt_gp,
372 &dev->t10_alua.tg_pt_gps_list,
373 tg_pt_gp_list) {
374 if (!tg_pt_gp->tg_pt_gp_valid_id)
375 continue;
376
377 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
378 continue;
379
380 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
381
382 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
383
384 if (!core_alua_do_port_transition(tg_pt_gp,
385 dev, l_lun, nacl,
386 alua_access_state, 1))
387 found = true;
388
389 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
390 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
391 break;
392 }
393 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
394 } else {
395 struct se_lun *lun;
396
397 /*
398 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
399 * the Target Port in question for the the incoming
400 * SET_TARGET_PORT_GROUPS op.
401 */
402 rtpi = get_unaligned_be16(ptr + 2);
403 /*
404 * Locate the matching relative target port identifier
405 * for the struct se_device storage object.
406 */
407 spin_lock(&dev->se_port_lock);
408 list_for_each_entry(lun, &dev->dev_sep_list,
409 lun_dev_link) {
410 if (lun->lun_rtpi != rtpi)
411 continue;
412
413 // XXX: racy unlock
414 spin_unlock(&dev->se_port_lock);
415
416 if (!core_alua_set_tg_pt_secondary_state(
417 lun, 1, 1))
418 found = true;
419
420 spin_lock(&dev->se_port_lock);
421 break;
422 }
423 spin_unlock(&dev->se_port_lock);
424 }
425
426 if (!found) {
427 rc = TCM_INVALID_PARAMETER_LIST;
428 goto out;
429 }
430
431 ptr += 4;
432 len += 4;
433 }
434
435 out:
436 transport_kunmap_data_sg(cmd);
437 if (!rc)
438 target_complete_cmd(cmd, GOOD);
439 return rc;
440 }
441
442 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
443 {
444 /*
445 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
446 * The ALUA additional sense code qualifier (ASCQ) is determined
447 * by the ALUA primary or secondary access state..
448 */
449 pr_debug("[%s]: ALUA TG Port not available, "
450 "SenseKey: NOT_READY, ASC/ASCQ: "
451 "0x04/0x%02x\n",
452 cmd->se_tfo->get_fabric_name(), alua_ascq);
453
454 cmd->scsi_asc = 0x04;
455 cmd->scsi_ascq = alua_ascq;
456 }
457
458 static inline void core_alua_state_nonoptimized(
459 struct se_cmd *cmd,
460 unsigned char *cdb,
461 int nonop_delay_msecs)
462 {
463 /*
464 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
465 * later to determine if processing of this cmd needs to be
466 * temporarily delayed for the Active/NonOptimized primary access state.
467 */
468 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
469 cmd->alua_nonop_delay = nonop_delay_msecs;
470 }
471
472 static inline int core_alua_state_lba_dependent(
473 struct se_cmd *cmd,
474 struct t10_alua_tg_pt_gp *tg_pt_gp)
475 {
476 struct se_device *dev = cmd->se_dev;
477 u64 segment_size, segment_mult, sectors, lba;
478
479 /* Only need to check for cdb actually containing LBAs */
480 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
481 return 0;
482
483 spin_lock(&dev->t10_alua.lba_map_lock);
484 segment_size = dev->t10_alua.lba_map_segment_size;
485 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
486 sectors = cmd->data_length / dev->dev_attrib.block_size;
487
488 lba = cmd->t_task_lba;
489 while (lba < cmd->t_task_lba + sectors) {
490 struct t10_alua_lba_map *cur_map = NULL, *map;
491 struct t10_alua_lba_map_member *map_mem;
492
493 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
494 lba_map_list) {
495 u64 start_lba, last_lba;
496 u64 first_lba = map->lba_map_first_lba;
497
498 if (segment_mult) {
499 u64 tmp = lba;
500 start_lba = do_div(tmp, segment_size * segment_mult);
501
502 last_lba = first_lba + segment_size - 1;
503 if (start_lba >= first_lba &&
504 start_lba <= last_lba) {
505 lba += segment_size;
506 cur_map = map;
507 break;
508 }
509 } else {
510 last_lba = map->lba_map_last_lba;
511 if (lba >= first_lba && lba <= last_lba) {
512 lba = last_lba + 1;
513 cur_map = map;
514 break;
515 }
516 }
517 }
518 if (!cur_map) {
519 spin_unlock(&dev->t10_alua.lba_map_lock);
520 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
521 return 1;
522 }
523 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
524 lba_map_mem_list) {
525 if (map_mem->lba_map_mem_alua_pg_id !=
526 tg_pt_gp->tg_pt_gp_id)
527 continue;
528 switch(map_mem->lba_map_mem_alua_state) {
529 case ALUA_ACCESS_STATE_STANDBY:
530 spin_unlock(&dev->t10_alua.lba_map_lock);
531 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
532 return 1;
533 case ALUA_ACCESS_STATE_UNAVAILABLE:
534 spin_unlock(&dev->t10_alua.lba_map_lock);
535 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
536 return 1;
537 default:
538 break;
539 }
540 }
541 }
542 spin_unlock(&dev->t10_alua.lba_map_lock);
543 return 0;
544 }
545
546 static inline int core_alua_state_standby(
547 struct se_cmd *cmd,
548 unsigned char *cdb)
549 {
550 /*
551 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
552 * spc4r17 section 5.9.2.4.4
553 */
554 switch (cdb[0]) {
555 case INQUIRY:
556 case LOG_SELECT:
557 case LOG_SENSE:
558 case MODE_SELECT:
559 case MODE_SENSE:
560 case REPORT_LUNS:
561 case RECEIVE_DIAGNOSTIC:
562 case SEND_DIAGNOSTIC:
563 case READ_CAPACITY:
564 return 0;
565 case SERVICE_ACTION_IN_16:
566 switch (cdb[1] & 0x1f) {
567 case SAI_READ_CAPACITY_16:
568 return 0;
569 default:
570 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
571 return 1;
572 }
573 case MAINTENANCE_IN:
574 switch (cdb[1] & 0x1f) {
575 case MI_REPORT_TARGET_PGS:
576 return 0;
577 default:
578 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
579 return 1;
580 }
581 case MAINTENANCE_OUT:
582 switch (cdb[1]) {
583 case MO_SET_TARGET_PGS:
584 return 0;
585 default:
586 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
587 return 1;
588 }
589 case REQUEST_SENSE:
590 case PERSISTENT_RESERVE_IN:
591 case PERSISTENT_RESERVE_OUT:
592 case READ_BUFFER:
593 case WRITE_BUFFER:
594 return 0;
595 default:
596 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
597 return 1;
598 }
599
600 return 0;
601 }
602
603 static inline int core_alua_state_unavailable(
604 struct se_cmd *cmd,
605 unsigned char *cdb)
606 {
607 /*
608 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
609 * spc4r17 section 5.9.2.4.5
610 */
611 switch (cdb[0]) {
612 case INQUIRY:
613 case REPORT_LUNS:
614 return 0;
615 case MAINTENANCE_IN:
616 switch (cdb[1] & 0x1f) {
617 case MI_REPORT_TARGET_PGS:
618 return 0;
619 default:
620 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
621 return 1;
622 }
623 case MAINTENANCE_OUT:
624 switch (cdb[1]) {
625 case MO_SET_TARGET_PGS:
626 return 0;
627 default:
628 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
629 return 1;
630 }
631 case REQUEST_SENSE:
632 case READ_BUFFER:
633 case WRITE_BUFFER:
634 return 0;
635 default:
636 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
637 return 1;
638 }
639
640 return 0;
641 }
642
643 static inline int core_alua_state_transition(
644 struct se_cmd *cmd,
645 unsigned char *cdb)
646 {
647 /*
648 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
649 * spc4r17 section 5.9.2.5
650 */
651 switch (cdb[0]) {
652 case INQUIRY:
653 case REPORT_LUNS:
654 return 0;
655 case MAINTENANCE_IN:
656 switch (cdb[1] & 0x1f) {
657 case MI_REPORT_TARGET_PGS:
658 return 0;
659 default:
660 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
661 return 1;
662 }
663 case REQUEST_SENSE:
664 case READ_BUFFER:
665 case WRITE_BUFFER:
666 return 0;
667 default:
668 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
669 return 1;
670 }
671
672 return 0;
673 }
674
675 /*
676 * return 1: Is used to signal LUN not accessible, and check condition/not ready
677 * return 0: Used to signal success
678 * return -1: Used to signal failure, and invalid cdb field
679 */
680 sense_reason_t
681 target_alua_state_check(struct se_cmd *cmd)
682 {
683 struct se_device *dev = cmd->se_dev;
684 unsigned char *cdb = cmd->t_task_cdb;
685 struct se_lun *lun = cmd->se_lun;
686 struct t10_alua_tg_pt_gp *tg_pt_gp;
687 int out_alua_state, nonop_delay_msecs;
688
689 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
690 return 0;
691 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
692 return 0;
693
694 /*
695 * First, check for a struct se_port specific secondary ALUA target port
696 * access state: OFFLINE
697 */
698 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
699 pr_debug("ALUA: Got secondary offline status for local"
700 " target port\n");
701 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
702 return TCM_CHECK_CONDITION_NOT_READY;
703 }
704
705 if (!lun->lun_tg_pt_gp)
706 return 0;
707
708 spin_lock(&lun->lun_tg_pt_gp_lock);
709 tg_pt_gp = lun->lun_tg_pt_gp;
710 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
711 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
712
713 // XXX: keeps using tg_pt_gp witout reference after unlock
714 spin_unlock(&lun->lun_tg_pt_gp_lock);
715 /*
716 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
717 * statement so the compiler knows explicitly to check this case first.
718 * For the Optimized ALUA access state case, we want to process the
719 * incoming fabric cmd ASAP..
720 */
721 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
722 return 0;
723
724 switch (out_alua_state) {
725 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
726 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
727 break;
728 case ALUA_ACCESS_STATE_STANDBY:
729 if (core_alua_state_standby(cmd, cdb))
730 return TCM_CHECK_CONDITION_NOT_READY;
731 break;
732 case ALUA_ACCESS_STATE_UNAVAILABLE:
733 if (core_alua_state_unavailable(cmd, cdb))
734 return TCM_CHECK_CONDITION_NOT_READY;
735 break;
736 case ALUA_ACCESS_STATE_TRANSITION:
737 if (core_alua_state_transition(cmd, cdb))
738 return TCM_CHECK_CONDITION_NOT_READY;
739 break;
740 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
741 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
742 return TCM_CHECK_CONDITION_NOT_READY;
743 break;
744 /*
745 * OFFLINE is a secondary ALUA target port group access state, that is
746 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
747 */
748 case ALUA_ACCESS_STATE_OFFLINE:
749 default:
750 pr_err("Unknown ALUA access state: 0x%02x\n",
751 out_alua_state);
752 return TCM_INVALID_CDB_FIELD;
753 }
754
755 return 0;
756 }
757
758 /*
759 * Check implicit and explicit ALUA state change request.
760 */
761 static sense_reason_t
762 core_alua_check_transition(int state, int valid, int *primary)
763 {
764 /*
765 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
766 * defined as primary target port asymmetric access states.
767 */
768 switch (state) {
769 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
770 if (!(valid & ALUA_AO_SUP))
771 goto not_supported;
772 *primary = 1;
773 break;
774 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
775 if (!(valid & ALUA_AN_SUP))
776 goto not_supported;
777 *primary = 1;
778 break;
779 case ALUA_ACCESS_STATE_STANDBY:
780 if (!(valid & ALUA_S_SUP))
781 goto not_supported;
782 *primary = 1;
783 break;
784 case ALUA_ACCESS_STATE_UNAVAILABLE:
785 if (!(valid & ALUA_U_SUP))
786 goto not_supported;
787 *primary = 1;
788 break;
789 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
790 if (!(valid & ALUA_LBD_SUP))
791 goto not_supported;
792 *primary = 1;
793 break;
794 case ALUA_ACCESS_STATE_OFFLINE:
795 /*
796 * OFFLINE state is defined as a secondary target port
797 * asymmetric access state.
798 */
799 if (!(valid & ALUA_O_SUP))
800 goto not_supported;
801 *primary = 0;
802 break;
803 case ALUA_ACCESS_STATE_TRANSITION:
804 /*
805 * Transitioning is set internally, and
806 * cannot be selected manually.
807 */
808 goto not_supported;
809 default:
810 pr_err("Unknown ALUA access state: 0x%02x\n", state);
811 return TCM_INVALID_PARAMETER_LIST;
812 }
813
814 return 0;
815
816 not_supported:
817 pr_err("ALUA access state %s not supported",
818 core_alua_dump_state(state));
819 return TCM_INVALID_PARAMETER_LIST;
820 }
821
822 static char *core_alua_dump_state(int state)
823 {
824 switch (state) {
825 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
826 return "Active/Optimized";
827 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
828 return "Active/NonOptimized";
829 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
830 return "LBA Dependent";
831 case ALUA_ACCESS_STATE_STANDBY:
832 return "Standby";
833 case ALUA_ACCESS_STATE_UNAVAILABLE:
834 return "Unavailable";
835 case ALUA_ACCESS_STATE_OFFLINE:
836 return "Offline";
837 case ALUA_ACCESS_STATE_TRANSITION:
838 return "Transitioning";
839 default:
840 return "Unknown";
841 }
842
843 return NULL;
844 }
845
846 char *core_alua_dump_status(int status)
847 {
848 switch (status) {
849 case ALUA_STATUS_NONE:
850 return "None";
851 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
852 return "Altered by Explicit STPG";
853 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
854 return "Altered by Implicit ALUA";
855 default:
856 return "Unknown";
857 }
858
859 return NULL;
860 }
861
862 /*
863 * Used by fabric modules to determine when we need to delay processing
864 * for the Active/NonOptimized paths..
865 */
866 int core_alua_check_nonop_delay(
867 struct se_cmd *cmd)
868 {
869 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
870 return 0;
871 if (in_interrupt())
872 return 0;
873 /*
874 * The ALUA Active/NonOptimized access state delay can be disabled
875 * in via configfs with a value of zero
876 */
877 if (!cmd->alua_nonop_delay)
878 return 0;
879 /*
880 * struct se_cmd->alua_nonop_delay gets set by a target port group
881 * defined interval in core_alua_state_nonoptimized()
882 */
883 msleep_interruptible(cmd->alua_nonop_delay);
884 return 0;
885 }
886 EXPORT_SYMBOL(core_alua_check_nonop_delay);
887
888 static int core_alua_write_tpg_metadata(
889 const char *path,
890 unsigned char *md_buf,
891 u32 md_buf_len)
892 {
893 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
894 int ret;
895
896 if (IS_ERR(file)) {
897 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
898 return -ENODEV;
899 }
900 ret = kernel_write(file, md_buf, md_buf_len, 0);
901 if (ret < 0)
902 pr_err("Error writing ALUA metadata file: %s\n", path);
903 fput(file);
904 return (ret < 0) ? -EIO : 0;
905 }
906
907 /*
908 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
909 */
910 static int core_alua_update_tpg_primary_metadata(
911 struct t10_alua_tg_pt_gp *tg_pt_gp)
912 {
913 unsigned char *md_buf;
914 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
915 char path[ALUA_METADATA_PATH_LEN];
916 int len, rc;
917
918 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
919 if (!md_buf) {
920 pr_err("Unable to allocate buf for ALUA metadata\n");
921 return -ENOMEM;
922 }
923
924 memset(path, 0, ALUA_METADATA_PATH_LEN);
925
926 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
927 "tg_pt_gp_id=%hu\n"
928 "alua_access_state=0x%02x\n"
929 "alua_access_status=0x%02x\n",
930 tg_pt_gp->tg_pt_gp_id,
931 tg_pt_gp->tg_pt_gp_alua_pending_state,
932 tg_pt_gp->tg_pt_gp_alua_access_status);
933
934 snprintf(path, ALUA_METADATA_PATH_LEN,
935 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
936 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
937
938 rc = core_alua_write_tpg_metadata(path, md_buf, len);
939 kfree(md_buf);
940 return rc;
941 }
942
943 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
944 {
945 struct se_dev_entry *se_deve;
946 struct se_lun *lun;
947 struct se_lun_acl *lacl;
948
949 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
950 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
951 lun_tg_pt_gp_link) {
952 /*
953 * After an implicit target port asymmetric access state
954 * change, a device server shall establish a unit attention
955 * condition for the initiator port associated with every I_T
956 * nexus with the additional sense code set to ASYMMETRIC
957 * ACCESS STATE CHANGED.
958 *
959 * After an explicit target port asymmetric access state
960 * change, a device server shall establish a unit attention
961 * condition with the additional sense code set to ASYMMETRIC
962 * ACCESS STATE CHANGED for the initiator port associated with
963 * every I_T nexus other than the I_T nexus on which the SET
964 * TARGET PORT GROUPS command
965 */
966 if (!percpu_ref_tryget_live(&lun->lun_ref))
967 continue;
968 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
969
970 spin_lock(&lun->lun_deve_lock);
971 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
972 lacl = rcu_dereference_check(se_deve->se_lun_acl,
973 lockdep_is_held(&lun->lun_deve_lock));
974
975 /*
976 * spc4r37 p.242:
977 * After an explicit target port asymmetric access
978 * state change, a device server shall establish a
979 * unit attention condition with the additional sense
980 * code set to ASYMMETRIC ACCESS STATE CHANGED for
981 * the initiator port associated with every I_T nexus
982 * other than the I_T nexus on which the SET TARGET
983 * PORT GROUPS command was received.
984 */
985 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
986 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
987 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
988 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
989 continue;
990
991 /*
992 * se_deve->se_lun_acl pointer may be NULL for a
993 * entry created without explicit Node+MappedLUN ACLs
994 */
995 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
996 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
997 continue;
998
999 core_scsi3_ua_allocate(se_deve, 0x2A,
1000 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1001 }
1002 spin_unlock(&lun->lun_deve_lock);
1003
1004 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1005 percpu_ref_put(&lun->lun_ref);
1006 }
1007 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1008 }
1009
1010 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
1011 {
1012 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
1013 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
1014 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1015 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
1016 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
1017
1018 /*
1019 * Update the ALUA metadata buf that has been allocated in
1020 * core_alua_do_port_transition(), this metadata will be written
1021 * to struct file.
1022 *
1023 * Note that there is the case where we do not want to update the
1024 * metadata when the saved metadata is being parsed in userspace
1025 * when setting the existing port access state and access status.
1026 *
1027 * Also note that the failure to write out the ALUA metadata to
1028 * struct file does NOT affect the actual ALUA transition.
1029 */
1030 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1031 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1032 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1033 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1034 }
1035 /*
1036 * Set the current primary ALUA access state to the requested new state
1037 */
1038 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1039 tg_pt_gp->tg_pt_gp_alua_pending_state);
1040
1041 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1042 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1043 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1044 tg_pt_gp->tg_pt_gp_id,
1045 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1046 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1047
1048 core_alua_queue_state_change_ua(tg_pt_gp);
1049
1050 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1051 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1052 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1053
1054 if (tg_pt_gp->tg_pt_gp_transition_complete)
1055 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1056 }
1057
1058 static int core_alua_do_transition_tg_pt(
1059 struct t10_alua_tg_pt_gp *tg_pt_gp,
1060 int new_state,
1061 int explicit)
1062 {
1063 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1064 DECLARE_COMPLETION_ONSTACK(wait);
1065
1066 /* Nothing to be done here */
1067 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1068 return 0;
1069
1070 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1071 return -EAGAIN;
1072
1073 /*
1074 * Flush any pending transitions
1075 */
1076 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1077 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1078 ALUA_ACCESS_STATE_TRANSITION) {
1079 /* Just in case */
1080 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1081 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1082 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1083 wait_for_completion(&wait);
1084 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1085 return 0;
1086 }
1087
1088 /*
1089 * Save the old primary ALUA access state, and set the current state
1090 * to ALUA_ACCESS_STATE_TRANSITION.
1091 */
1092 tg_pt_gp->tg_pt_gp_alua_previous_state =
1093 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1094 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1095
1096 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1097 ALUA_ACCESS_STATE_TRANSITION);
1098 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1099 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1100 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1101
1102 core_alua_queue_state_change_ua(tg_pt_gp);
1103
1104 /*
1105 * Check for the optional ALUA primary state transition delay
1106 */
1107 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1108 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1109
1110 /*
1111 * Take a reference for workqueue item
1112 */
1113 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1114 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1115 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1116
1117 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1118 unsigned long transition_tmo;
1119
1120 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1121 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1122 &tg_pt_gp->tg_pt_gp_transition_work,
1123 transition_tmo);
1124 } else {
1125 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1126 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1127 &tg_pt_gp->tg_pt_gp_transition_work, 0);
1128 wait_for_completion(&wait);
1129 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1130 }
1131
1132 return 0;
1133 }
1134
1135 int core_alua_do_port_transition(
1136 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1137 struct se_device *l_dev,
1138 struct se_lun *l_lun,
1139 struct se_node_acl *l_nacl,
1140 int new_state,
1141 int explicit)
1142 {
1143 struct se_device *dev;
1144 struct t10_alua_lu_gp *lu_gp;
1145 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1146 struct t10_alua_tg_pt_gp *tg_pt_gp;
1147 int primary, valid_states, rc = 0;
1148
1149 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1150 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1151 return -EINVAL;
1152
1153 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1154 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1155 lu_gp = local_lu_gp_mem->lu_gp;
1156 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1157 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1158 /*
1159 * For storage objects that are members of the 'default_lu_gp',
1160 * we only do transition on the passed *l_tp_pt_gp, and not
1161 * on all of the matching target port groups IDs in default_lu_gp.
1162 */
1163 if (!lu_gp->lu_gp_id) {
1164 /*
1165 * core_alua_do_transition_tg_pt() will always return
1166 * success.
1167 */
1168 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1169 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1170 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1171 new_state, explicit);
1172 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1173 return rc;
1174 }
1175 /*
1176 * For all other LU groups aside from 'default_lu_gp', walk all of
1177 * the associated storage objects looking for a matching target port
1178 * group ID from the local target port group.
1179 */
1180 spin_lock(&lu_gp->lu_gp_lock);
1181 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1182 lu_gp_mem_list) {
1183
1184 dev = lu_gp_mem->lu_gp_mem_dev;
1185 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1186 spin_unlock(&lu_gp->lu_gp_lock);
1187
1188 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1189 list_for_each_entry(tg_pt_gp,
1190 &dev->t10_alua.tg_pt_gps_list,
1191 tg_pt_gp_list) {
1192
1193 if (!tg_pt_gp->tg_pt_gp_valid_id)
1194 continue;
1195 /*
1196 * If the target behavior port asymmetric access state
1197 * is changed for any target port group accessible via
1198 * a logical unit within a LU group, the target port
1199 * behavior group asymmetric access states for the same
1200 * target port group accessible via other logical units
1201 * in that LU group will also change.
1202 */
1203 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1204 continue;
1205
1206 if (l_tg_pt_gp == tg_pt_gp) {
1207 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1208 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1209 } else {
1210 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1211 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1212 }
1213 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1214 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1215 /*
1216 * core_alua_do_transition_tg_pt() will always return
1217 * success.
1218 */
1219 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1220 new_state, explicit);
1221
1222 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1223 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1224 if (rc)
1225 break;
1226 }
1227 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1228
1229 spin_lock(&lu_gp->lu_gp_lock);
1230 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1231 }
1232 spin_unlock(&lu_gp->lu_gp_lock);
1233
1234 if (!rc) {
1235 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1236 " Group IDs: %hu %s transition to primary state: %s\n",
1237 config_item_name(&lu_gp->lu_gp_group.cg_item),
1238 l_tg_pt_gp->tg_pt_gp_id,
1239 (explicit) ? "explicit" : "implicit",
1240 core_alua_dump_state(new_state));
1241 }
1242
1243 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1244 return rc;
1245 }
1246
1247 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1248 {
1249 struct se_portal_group *se_tpg = lun->lun_tpg;
1250 unsigned char *md_buf;
1251 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1252 int len, rc;
1253
1254 mutex_lock(&lun->lun_tg_pt_md_mutex);
1255
1256 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1257 if (!md_buf) {
1258 pr_err("Unable to allocate buf for ALUA metadata\n");
1259 rc = -ENOMEM;
1260 goto out_unlock;
1261 }
1262
1263 memset(path, 0, ALUA_METADATA_PATH_LEN);
1264 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1265
1266 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1267 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1268
1269 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1270 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1271 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1272
1273 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1274 "alua_tg_pt_status=0x%02x\n",
1275 atomic_read(&lun->lun_tg_pt_secondary_offline),
1276 lun->lun_tg_pt_secondary_stat);
1277
1278 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%llu",
1279 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1280 lun->unpacked_lun);
1281
1282 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1283 kfree(md_buf);
1284
1285 out_unlock:
1286 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1287 return rc;
1288 }
1289
1290 static int core_alua_set_tg_pt_secondary_state(
1291 struct se_lun *lun,
1292 int explicit,
1293 int offline)
1294 {
1295 struct t10_alua_tg_pt_gp *tg_pt_gp;
1296 int trans_delay_msecs;
1297
1298 spin_lock(&lun->lun_tg_pt_gp_lock);
1299 tg_pt_gp = lun->lun_tg_pt_gp;
1300 if (!tg_pt_gp) {
1301 spin_unlock(&lun->lun_tg_pt_gp_lock);
1302 pr_err("Unable to complete secondary state"
1303 " transition\n");
1304 return -EINVAL;
1305 }
1306 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1307 /*
1308 * Set the secondary ALUA target port access state to OFFLINE
1309 * or release the previously secondary state for struct se_lun
1310 */
1311 if (offline)
1312 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1313 else
1314 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1315
1316 lun->lun_tg_pt_secondary_stat = (explicit) ?
1317 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1318 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1319
1320 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1321 " to secondary access state: %s\n", (explicit) ? "explicit" :
1322 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1323 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1324
1325 spin_unlock(&lun->lun_tg_pt_gp_lock);
1326 /*
1327 * Do the optional transition delay after we set the secondary
1328 * ALUA access state.
1329 */
1330 if (trans_delay_msecs != 0)
1331 msleep_interruptible(trans_delay_msecs);
1332 /*
1333 * See if we need to update the ALUA fabric port metadata for
1334 * secondary state and status
1335 */
1336 if (lun->lun_tg_pt_secondary_write_md)
1337 core_alua_update_tpg_secondary_metadata(lun);
1338
1339 return 0;
1340 }
1341
1342 struct t10_alua_lba_map *
1343 core_alua_allocate_lba_map(struct list_head *list,
1344 u64 first_lba, u64 last_lba)
1345 {
1346 struct t10_alua_lba_map *lba_map;
1347
1348 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1349 if (!lba_map) {
1350 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1351 return ERR_PTR(-ENOMEM);
1352 }
1353 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1354 lba_map->lba_map_first_lba = first_lba;
1355 lba_map->lba_map_last_lba = last_lba;
1356
1357 list_add_tail(&lba_map->lba_map_list, list);
1358 return lba_map;
1359 }
1360
1361 int
1362 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1363 int pg_id, int state)
1364 {
1365 struct t10_alua_lba_map_member *lba_map_mem;
1366
1367 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1368 lba_map_mem_list) {
1369 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1370 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1371 return -EINVAL;
1372 }
1373 }
1374
1375 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1376 if (!lba_map_mem) {
1377 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1378 return -ENOMEM;
1379 }
1380 lba_map_mem->lba_map_mem_alua_state = state;
1381 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1382
1383 list_add_tail(&lba_map_mem->lba_map_mem_list,
1384 &lba_map->lba_map_mem_list);
1385 return 0;
1386 }
1387
1388 void
1389 core_alua_free_lba_map(struct list_head *lba_list)
1390 {
1391 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1392 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1393
1394 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1395 lba_map_list) {
1396 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1397 &lba_map->lba_map_mem_list,
1398 lba_map_mem_list) {
1399 list_del(&lba_map_mem->lba_map_mem_list);
1400 kmem_cache_free(t10_alua_lba_map_mem_cache,
1401 lba_map_mem);
1402 }
1403 list_del(&lba_map->lba_map_list);
1404 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1405 }
1406 }
1407
1408 void
1409 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1410 int segment_size, int segment_mult)
1411 {
1412 struct list_head old_lba_map_list;
1413 struct t10_alua_tg_pt_gp *tg_pt_gp;
1414 int activate = 0, supported;
1415
1416 INIT_LIST_HEAD(&old_lba_map_list);
1417 spin_lock(&dev->t10_alua.lba_map_lock);
1418 dev->t10_alua.lba_map_segment_size = segment_size;
1419 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1420 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1421 if (lba_map_list) {
1422 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1423 activate = 1;
1424 }
1425 spin_unlock(&dev->t10_alua.lba_map_lock);
1426 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1427 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1428 tg_pt_gp_list) {
1429
1430 if (!tg_pt_gp->tg_pt_gp_valid_id)
1431 continue;
1432 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1433 if (activate)
1434 supported |= ALUA_LBD_SUP;
1435 else
1436 supported &= ~ALUA_LBD_SUP;
1437 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1438 }
1439 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1440 core_alua_free_lba_map(&old_lba_map_list);
1441 }
1442
1443 struct t10_alua_lu_gp *
1444 core_alua_allocate_lu_gp(const char *name, int def_group)
1445 {
1446 struct t10_alua_lu_gp *lu_gp;
1447
1448 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1449 if (!lu_gp) {
1450 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1451 return ERR_PTR(-ENOMEM);
1452 }
1453 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1454 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1455 spin_lock_init(&lu_gp->lu_gp_lock);
1456 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1457
1458 if (def_group) {
1459 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1460 lu_gp->lu_gp_valid_id = 1;
1461 alua_lu_gps_count++;
1462 }
1463
1464 return lu_gp;
1465 }
1466
1467 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1468 {
1469 struct t10_alua_lu_gp *lu_gp_tmp;
1470 u16 lu_gp_id_tmp;
1471 /*
1472 * The lu_gp->lu_gp_id may only be set once..
1473 */
1474 if (lu_gp->lu_gp_valid_id) {
1475 pr_warn("ALUA LU Group already has a valid ID,"
1476 " ignoring request\n");
1477 return -EINVAL;
1478 }
1479
1480 spin_lock(&lu_gps_lock);
1481 if (alua_lu_gps_count == 0x0000ffff) {
1482 pr_err("Maximum ALUA alua_lu_gps_count:"
1483 " 0x0000ffff reached\n");
1484 spin_unlock(&lu_gps_lock);
1485 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1486 return -ENOSPC;
1487 }
1488 again:
1489 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1490 alua_lu_gps_counter++;
1491
1492 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1493 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1494 if (!lu_gp_id)
1495 goto again;
1496
1497 pr_warn("ALUA Logical Unit Group ID: %hu"
1498 " already exists, ignoring request\n",
1499 lu_gp_id);
1500 spin_unlock(&lu_gps_lock);
1501 return -EINVAL;
1502 }
1503 }
1504
1505 lu_gp->lu_gp_id = lu_gp_id_tmp;
1506 lu_gp->lu_gp_valid_id = 1;
1507 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1508 alua_lu_gps_count++;
1509 spin_unlock(&lu_gps_lock);
1510
1511 return 0;
1512 }
1513
1514 static struct t10_alua_lu_gp_member *
1515 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1516 {
1517 struct t10_alua_lu_gp_member *lu_gp_mem;
1518
1519 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1520 if (!lu_gp_mem) {
1521 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1522 return ERR_PTR(-ENOMEM);
1523 }
1524 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1525 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1526 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1527
1528 lu_gp_mem->lu_gp_mem_dev = dev;
1529 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1530
1531 return lu_gp_mem;
1532 }
1533
1534 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1535 {
1536 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1537 /*
1538 * Once we have reached this point, config_item_put() has
1539 * already been called from target_core_alua_drop_lu_gp().
1540 *
1541 * Here, we remove the *lu_gp from the global list so that
1542 * no associations can be made while we are releasing
1543 * struct t10_alua_lu_gp.
1544 */
1545 spin_lock(&lu_gps_lock);
1546 list_del(&lu_gp->lu_gp_node);
1547 alua_lu_gps_count--;
1548 spin_unlock(&lu_gps_lock);
1549 /*
1550 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1551 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1552 * released with core_alua_put_lu_gp_from_name()
1553 */
1554 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1555 cpu_relax();
1556 /*
1557 * Release reference to struct t10_alua_lu_gp * from all associated
1558 * struct se_device.
1559 */
1560 spin_lock(&lu_gp->lu_gp_lock);
1561 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1562 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1563 if (lu_gp_mem->lu_gp_assoc) {
1564 list_del(&lu_gp_mem->lu_gp_mem_list);
1565 lu_gp->lu_gp_members--;
1566 lu_gp_mem->lu_gp_assoc = 0;
1567 }
1568 spin_unlock(&lu_gp->lu_gp_lock);
1569 /*
1570 *
1571 * lu_gp_mem is associated with a single
1572 * struct se_device->dev_alua_lu_gp_mem, and is released when
1573 * struct se_device is released via core_alua_free_lu_gp_mem().
1574 *
1575 * If the passed lu_gp does NOT match the default_lu_gp, assume
1576 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1577 */
1578 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1579 if (lu_gp != default_lu_gp)
1580 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1581 default_lu_gp);
1582 else
1583 lu_gp_mem->lu_gp = NULL;
1584 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1585
1586 spin_lock(&lu_gp->lu_gp_lock);
1587 }
1588 spin_unlock(&lu_gp->lu_gp_lock);
1589
1590 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1591 }
1592
1593 void core_alua_free_lu_gp_mem(struct se_device *dev)
1594 {
1595 struct t10_alua_lu_gp *lu_gp;
1596 struct t10_alua_lu_gp_member *lu_gp_mem;
1597
1598 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1599 if (!lu_gp_mem)
1600 return;
1601
1602 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1603 cpu_relax();
1604
1605 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1606 lu_gp = lu_gp_mem->lu_gp;
1607 if (lu_gp) {
1608 spin_lock(&lu_gp->lu_gp_lock);
1609 if (lu_gp_mem->lu_gp_assoc) {
1610 list_del(&lu_gp_mem->lu_gp_mem_list);
1611 lu_gp->lu_gp_members--;
1612 lu_gp_mem->lu_gp_assoc = 0;
1613 }
1614 spin_unlock(&lu_gp->lu_gp_lock);
1615 lu_gp_mem->lu_gp = NULL;
1616 }
1617 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1618
1619 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1620 }
1621
1622 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1623 {
1624 struct t10_alua_lu_gp *lu_gp;
1625 struct config_item *ci;
1626
1627 spin_lock(&lu_gps_lock);
1628 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1629 if (!lu_gp->lu_gp_valid_id)
1630 continue;
1631 ci = &lu_gp->lu_gp_group.cg_item;
1632 if (!strcmp(config_item_name(ci), name)) {
1633 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1634 spin_unlock(&lu_gps_lock);
1635 return lu_gp;
1636 }
1637 }
1638 spin_unlock(&lu_gps_lock);
1639
1640 return NULL;
1641 }
1642
1643 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1644 {
1645 spin_lock(&lu_gps_lock);
1646 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1647 spin_unlock(&lu_gps_lock);
1648 }
1649
1650 /*
1651 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1652 */
1653 void __core_alua_attach_lu_gp_mem(
1654 struct t10_alua_lu_gp_member *lu_gp_mem,
1655 struct t10_alua_lu_gp *lu_gp)
1656 {
1657 spin_lock(&lu_gp->lu_gp_lock);
1658 lu_gp_mem->lu_gp = lu_gp;
1659 lu_gp_mem->lu_gp_assoc = 1;
1660 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1661 lu_gp->lu_gp_members++;
1662 spin_unlock(&lu_gp->lu_gp_lock);
1663 }
1664
1665 /*
1666 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1667 */
1668 void __core_alua_drop_lu_gp_mem(
1669 struct t10_alua_lu_gp_member *lu_gp_mem,
1670 struct t10_alua_lu_gp *lu_gp)
1671 {
1672 spin_lock(&lu_gp->lu_gp_lock);
1673 list_del(&lu_gp_mem->lu_gp_mem_list);
1674 lu_gp_mem->lu_gp = NULL;
1675 lu_gp_mem->lu_gp_assoc = 0;
1676 lu_gp->lu_gp_members--;
1677 spin_unlock(&lu_gp->lu_gp_lock);
1678 }
1679
1680 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1681 const char *name, int def_group)
1682 {
1683 struct t10_alua_tg_pt_gp *tg_pt_gp;
1684
1685 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1686 if (!tg_pt_gp) {
1687 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1688 return NULL;
1689 }
1690 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1691 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1692 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1693 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1694 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1695 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1696 core_alua_do_transition_tg_pt_work);
1697 tg_pt_gp->tg_pt_gp_dev = dev;
1698 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1699 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1700 /*
1701 * Enable both explicit and implicit ALUA support by default
1702 */
1703 tg_pt_gp->tg_pt_gp_alua_access_type =
1704 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1705 /*
1706 * Set the default Active/NonOptimized Delay in milliseconds
1707 */
1708 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1709 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1710 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1711
1712 /*
1713 * Enable all supported states
1714 */
1715 tg_pt_gp->tg_pt_gp_alua_supported_states =
1716 ALUA_T_SUP | ALUA_O_SUP |
1717 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1718
1719 if (def_group) {
1720 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1721 tg_pt_gp->tg_pt_gp_id =
1722 dev->t10_alua.alua_tg_pt_gps_counter++;
1723 tg_pt_gp->tg_pt_gp_valid_id = 1;
1724 dev->t10_alua.alua_tg_pt_gps_count++;
1725 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1726 &dev->t10_alua.tg_pt_gps_list);
1727 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1728 }
1729
1730 return tg_pt_gp;
1731 }
1732
1733 int core_alua_set_tg_pt_gp_id(
1734 struct t10_alua_tg_pt_gp *tg_pt_gp,
1735 u16 tg_pt_gp_id)
1736 {
1737 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1738 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1739 u16 tg_pt_gp_id_tmp;
1740
1741 /*
1742 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1743 */
1744 if (tg_pt_gp->tg_pt_gp_valid_id) {
1745 pr_warn("ALUA TG PT Group already has a valid ID,"
1746 " ignoring request\n");
1747 return -EINVAL;
1748 }
1749
1750 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1751 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1752 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1753 " 0x0000ffff reached\n");
1754 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1755 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1756 return -ENOSPC;
1757 }
1758 again:
1759 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1760 dev->t10_alua.alua_tg_pt_gps_counter++;
1761
1762 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1763 tg_pt_gp_list) {
1764 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1765 if (!tg_pt_gp_id)
1766 goto again;
1767
1768 pr_err("ALUA Target Port Group ID: %hu already"
1769 " exists, ignoring request\n", tg_pt_gp_id);
1770 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1771 return -EINVAL;
1772 }
1773 }
1774
1775 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1776 tg_pt_gp->tg_pt_gp_valid_id = 1;
1777 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1778 &dev->t10_alua.tg_pt_gps_list);
1779 dev->t10_alua.alua_tg_pt_gps_count++;
1780 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1781
1782 return 0;
1783 }
1784
1785 void core_alua_free_tg_pt_gp(
1786 struct t10_alua_tg_pt_gp *tg_pt_gp)
1787 {
1788 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1789 struct se_lun *lun, *next;
1790
1791 /*
1792 * Once we have reached this point, config_item_put() has already
1793 * been called from target_core_alua_drop_tg_pt_gp().
1794 *
1795 * Here we remove *tg_pt_gp from the global list so that
1796 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1797 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1798 */
1799 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1800 list_del(&tg_pt_gp->tg_pt_gp_list);
1801 dev->t10_alua.alua_tg_pt_gps_counter--;
1802 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1803
1804 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1805
1806 /*
1807 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1808 * core_alua_get_tg_pt_gp_by_name() in
1809 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1810 * to be released with core_alua_put_tg_pt_gp_from_name().
1811 */
1812 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1813 cpu_relax();
1814
1815 /*
1816 * Release reference to struct t10_alua_tg_pt_gp from all associated
1817 * struct se_port.
1818 */
1819 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1820 list_for_each_entry_safe(lun, next,
1821 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1822 list_del_init(&lun->lun_tg_pt_gp_link);
1823 tg_pt_gp->tg_pt_gp_members--;
1824
1825 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1826 /*
1827 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1828 * assume we want to re-associate a given tg_pt_gp_mem with
1829 * default_tg_pt_gp.
1830 */
1831 spin_lock(&lun->lun_tg_pt_gp_lock);
1832 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1833 __target_attach_tg_pt_gp(lun,
1834 dev->t10_alua.default_tg_pt_gp);
1835 } else
1836 lun->lun_tg_pt_gp = NULL;
1837 spin_unlock(&lun->lun_tg_pt_gp_lock);
1838
1839 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1840 }
1841 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1842
1843 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1844 }
1845
1846 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1847 struct se_device *dev, const char *name)
1848 {
1849 struct t10_alua_tg_pt_gp *tg_pt_gp;
1850 struct config_item *ci;
1851
1852 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1853 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1854 tg_pt_gp_list) {
1855 if (!tg_pt_gp->tg_pt_gp_valid_id)
1856 continue;
1857 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1858 if (!strcmp(config_item_name(ci), name)) {
1859 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1860 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1861 return tg_pt_gp;
1862 }
1863 }
1864 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1865
1866 return NULL;
1867 }
1868
1869 static void core_alua_put_tg_pt_gp_from_name(
1870 struct t10_alua_tg_pt_gp *tg_pt_gp)
1871 {
1872 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1873
1874 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1875 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1876 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1877 }
1878
1879 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1880 struct t10_alua_tg_pt_gp *tg_pt_gp)
1881 {
1882 struct se_dev_entry *se_deve;
1883
1884 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1885
1886 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1887 lun->lun_tg_pt_gp = tg_pt_gp;
1888 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1889 tg_pt_gp->tg_pt_gp_members++;
1890 spin_lock(&lun->lun_deve_lock);
1891 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1892 core_scsi3_ua_allocate(se_deve, 0x3f,
1893 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1894 spin_unlock(&lun->lun_deve_lock);
1895 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1896 }
1897
1898 void target_attach_tg_pt_gp(struct se_lun *lun,
1899 struct t10_alua_tg_pt_gp *tg_pt_gp)
1900 {
1901 spin_lock(&lun->lun_tg_pt_gp_lock);
1902 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1903 spin_unlock(&lun->lun_tg_pt_gp_lock);
1904 }
1905
1906 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1907 struct t10_alua_tg_pt_gp *tg_pt_gp)
1908 {
1909 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1910
1911 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1912 list_del_init(&lun->lun_tg_pt_gp_link);
1913 tg_pt_gp->tg_pt_gp_members--;
1914 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1915
1916 lun->lun_tg_pt_gp = NULL;
1917 }
1918
1919 void target_detach_tg_pt_gp(struct se_lun *lun)
1920 {
1921 struct t10_alua_tg_pt_gp *tg_pt_gp;
1922
1923 spin_lock(&lun->lun_tg_pt_gp_lock);
1924 tg_pt_gp = lun->lun_tg_pt_gp;
1925 if (tg_pt_gp)
1926 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1927 spin_unlock(&lun->lun_tg_pt_gp_lock);
1928 }
1929
1930 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1931 {
1932 struct config_item *tg_pt_ci;
1933 struct t10_alua_tg_pt_gp *tg_pt_gp;
1934 ssize_t len = 0;
1935
1936 spin_lock(&lun->lun_tg_pt_gp_lock);
1937 tg_pt_gp = lun->lun_tg_pt_gp;
1938 if (tg_pt_gp) {
1939 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1940 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1941 " %hu\nTG Port Primary Access State: %s\nTG Port "
1942 "Primary Access Status: %s\nTG Port Secondary Access"
1943 " State: %s\nTG Port Secondary Access Status: %s\n",
1944 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1945 core_alua_dump_state(atomic_read(
1946 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1947 core_alua_dump_status(
1948 tg_pt_gp->tg_pt_gp_alua_access_status),
1949 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1950 "Offline" : "None",
1951 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1952 }
1953 spin_unlock(&lun->lun_tg_pt_gp_lock);
1954
1955 return len;
1956 }
1957
1958 ssize_t core_alua_store_tg_pt_gp_info(
1959 struct se_lun *lun,
1960 const char *page,
1961 size_t count)
1962 {
1963 struct se_portal_group *tpg = lun->lun_tpg;
1964 /*
1965 * rcu_dereference_raw protected by se_lun->lun_group symlink
1966 * reference to se_device->dev_group.
1967 */
1968 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1969 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1970 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1971 int move = 0;
1972
1973 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
1974 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1975 return -ENODEV;
1976
1977 if (count > TG_PT_GROUP_NAME_BUF) {
1978 pr_err("ALUA Target Port Group alias too large!\n");
1979 return -EINVAL;
1980 }
1981 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1982 memcpy(buf, page, count);
1983 /*
1984 * Any ALUA target port group alias besides "NULL" means we will be
1985 * making a new group association.
1986 */
1987 if (strcmp(strstrip(buf), "NULL")) {
1988 /*
1989 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1990 * struct t10_alua_tg_pt_gp. This reference is released with
1991 * core_alua_put_tg_pt_gp_from_name() below.
1992 */
1993 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1994 strstrip(buf));
1995 if (!tg_pt_gp_new)
1996 return -ENODEV;
1997 }
1998
1999 spin_lock(&lun->lun_tg_pt_gp_lock);
2000 tg_pt_gp = lun->lun_tg_pt_gp;
2001 if (tg_pt_gp) {
2002 /*
2003 * Clearing an existing tg_pt_gp association, and replacing
2004 * with the default_tg_pt_gp.
2005 */
2006 if (!tg_pt_gp_new) {
2007 pr_debug("Target_Core_ConfigFS: Moving"
2008 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2009 " alua/%s, ID: %hu back to"
2010 " default_tg_pt_gp\n",
2011 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2012 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2013 config_item_name(&lun->lun_group.cg_item),
2014 config_item_name(
2015 &tg_pt_gp->tg_pt_gp_group.cg_item),
2016 tg_pt_gp->tg_pt_gp_id);
2017
2018 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2019 __target_attach_tg_pt_gp(lun,
2020 dev->t10_alua.default_tg_pt_gp);
2021 spin_unlock(&lun->lun_tg_pt_gp_lock);
2022
2023 return count;
2024 }
2025 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2026 move = 1;
2027 }
2028
2029 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
2030 spin_unlock(&lun->lun_tg_pt_gp_lock);
2031 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2032 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2033 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2034 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2035 config_item_name(&lun->lun_group.cg_item),
2036 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2037 tg_pt_gp_new->tg_pt_gp_id);
2038
2039 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2040 return count;
2041 }
2042
2043 ssize_t core_alua_show_access_type(
2044 struct t10_alua_tg_pt_gp *tg_pt_gp,
2045 char *page)
2046 {
2047 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2048 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2049 return sprintf(page, "Implicit and Explicit\n");
2050 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2051 return sprintf(page, "Implicit\n");
2052 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2053 return sprintf(page, "Explicit\n");
2054 else
2055 return sprintf(page, "None\n");
2056 }
2057
2058 ssize_t core_alua_store_access_type(
2059 struct t10_alua_tg_pt_gp *tg_pt_gp,
2060 const char *page,
2061 size_t count)
2062 {
2063 unsigned long tmp;
2064 int ret;
2065
2066 ret = kstrtoul(page, 0, &tmp);
2067 if (ret < 0) {
2068 pr_err("Unable to extract alua_access_type\n");
2069 return ret;
2070 }
2071 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2072 pr_err("Illegal value for alua_access_type:"
2073 " %lu\n", tmp);
2074 return -EINVAL;
2075 }
2076 if (tmp == 3)
2077 tg_pt_gp->tg_pt_gp_alua_access_type =
2078 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2079 else if (tmp == 2)
2080 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2081 else if (tmp == 1)
2082 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2083 else
2084 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2085
2086 return count;
2087 }
2088
2089 ssize_t core_alua_show_nonop_delay_msecs(
2090 struct t10_alua_tg_pt_gp *tg_pt_gp,
2091 char *page)
2092 {
2093 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2094 }
2095
2096 ssize_t core_alua_store_nonop_delay_msecs(
2097 struct t10_alua_tg_pt_gp *tg_pt_gp,
2098 const char *page,
2099 size_t count)
2100 {
2101 unsigned long tmp;
2102 int ret;
2103
2104 ret = kstrtoul(page, 0, &tmp);
2105 if (ret < 0) {
2106 pr_err("Unable to extract nonop_delay_msecs\n");
2107 return ret;
2108 }
2109 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2110 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2111 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2112 ALUA_MAX_NONOP_DELAY_MSECS);
2113 return -EINVAL;
2114 }
2115 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2116
2117 return count;
2118 }
2119
2120 ssize_t core_alua_show_trans_delay_msecs(
2121 struct t10_alua_tg_pt_gp *tg_pt_gp,
2122 char *page)
2123 {
2124 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2125 }
2126
2127 ssize_t core_alua_store_trans_delay_msecs(
2128 struct t10_alua_tg_pt_gp *tg_pt_gp,
2129 const char *page,
2130 size_t count)
2131 {
2132 unsigned long tmp;
2133 int ret;
2134
2135 ret = kstrtoul(page, 0, &tmp);
2136 if (ret < 0) {
2137 pr_err("Unable to extract trans_delay_msecs\n");
2138 return ret;
2139 }
2140 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2141 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2142 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2143 ALUA_MAX_TRANS_DELAY_MSECS);
2144 return -EINVAL;
2145 }
2146 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2147
2148 return count;
2149 }
2150
2151 ssize_t core_alua_show_implicit_trans_secs(
2152 struct t10_alua_tg_pt_gp *tg_pt_gp,
2153 char *page)
2154 {
2155 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2156 }
2157
2158 ssize_t core_alua_store_implicit_trans_secs(
2159 struct t10_alua_tg_pt_gp *tg_pt_gp,
2160 const char *page,
2161 size_t count)
2162 {
2163 unsigned long tmp;
2164 int ret;
2165
2166 ret = kstrtoul(page, 0, &tmp);
2167 if (ret < 0) {
2168 pr_err("Unable to extract implicit_trans_secs\n");
2169 return ret;
2170 }
2171 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2172 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2173 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2174 ALUA_MAX_IMPLICIT_TRANS_SECS);
2175 return -EINVAL;
2176 }
2177 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2178
2179 return count;
2180 }
2181
2182 ssize_t core_alua_show_preferred_bit(
2183 struct t10_alua_tg_pt_gp *tg_pt_gp,
2184 char *page)
2185 {
2186 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2187 }
2188
2189 ssize_t core_alua_store_preferred_bit(
2190 struct t10_alua_tg_pt_gp *tg_pt_gp,
2191 const char *page,
2192 size_t count)
2193 {
2194 unsigned long tmp;
2195 int ret;
2196
2197 ret = kstrtoul(page, 0, &tmp);
2198 if (ret < 0) {
2199 pr_err("Unable to extract preferred ALUA value\n");
2200 return ret;
2201 }
2202 if ((tmp != 0) && (tmp != 1)) {
2203 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2204 return -EINVAL;
2205 }
2206 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2207
2208 return count;
2209 }
2210
2211 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2212 {
2213 return sprintf(page, "%d\n",
2214 atomic_read(&lun->lun_tg_pt_secondary_offline));
2215 }
2216
2217 ssize_t core_alua_store_offline_bit(
2218 struct se_lun *lun,
2219 const char *page,
2220 size_t count)
2221 {
2222 /*
2223 * rcu_dereference_raw protected by se_lun->lun_group symlink
2224 * reference to se_device->dev_group.
2225 */
2226 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2227 unsigned long tmp;
2228 int ret;
2229
2230 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
2231 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2232 return -ENODEV;
2233
2234 ret = kstrtoul(page, 0, &tmp);
2235 if (ret < 0) {
2236 pr_err("Unable to extract alua_tg_pt_offline value\n");
2237 return ret;
2238 }
2239 if ((tmp != 0) && (tmp != 1)) {
2240 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2241 tmp);
2242 return -EINVAL;
2243 }
2244
2245 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2246 if (ret < 0)
2247 return -EINVAL;
2248
2249 return count;
2250 }
2251
2252 ssize_t core_alua_show_secondary_status(
2253 struct se_lun *lun,
2254 char *page)
2255 {
2256 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2257 }
2258
2259 ssize_t core_alua_store_secondary_status(
2260 struct se_lun *lun,
2261 const char *page,
2262 size_t count)
2263 {
2264 unsigned long tmp;
2265 int ret;
2266
2267 ret = kstrtoul(page, 0, &tmp);
2268 if (ret < 0) {
2269 pr_err("Unable to extract alua_tg_pt_status\n");
2270 return ret;
2271 }
2272 if ((tmp != ALUA_STATUS_NONE) &&
2273 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2274 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2275 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2276 tmp);
2277 return -EINVAL;
2278 }
2279 lun->lun_tg_pt_secondary_stat = (int)tmp;
2280
2281 return count;
2282 }
2283
2284 ssize_t core_alua_show_secondary_write_metadata(
2285 struct se_lun *lun,
2286 char *page)
2287 {
2288 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2289 }
2290
2291 ssize_t core_alua_store_secondary_write_metadata(
2292 struct se_lun *lun,
2293 const char *page,
2294 size_t count)
2295 {
2296 unsigned long tmp;
2297 int ret;
2298
2299 ret = kstrtoul(page, 0, &tmp);
2300 if (ret < 0) {
2301 pr_err("Unable to extract alua_tg_pt_write_md\n");
2302 return ret;
2303 }
2304 if ((tmp != 0) && (tmp != 1)) {
2305 pr_err("Illegal value for alua_tg_pt_write_md:"
2306 " %lu\n", tmp);
2307 return -EINVAL;
2308 }
2309 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2310
2311 return count;
2312 }
2313
2314 int core_setup_alua(struct se_device *dev)
2315 {
2316 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2317 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2318 struct t10_alua_lu_gp_member *lu_gp_mem;
2319
2320 /*
2321 * Associate this struct se_device with the default ALUA
2322 * LUN Group.
2323 */
2324 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2325 if (IS_ERR(lu_gp_mem))
2326 return PTR_ERR(lu_gp_mem);
2327
2328 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2329 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2330 default_lu_gp);
2331 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2332
2333 pr_debug("%s: Adding to default ALUA LU Group:"
2334 " core/alua/lu_gps/default_lu_gp\n",
2335 dev->transport->name);
2336 }
2337
2338 return 0;
2339 }
Linux with added FPC-III support