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