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Merge tag 'for-4.15-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_alua.c
1 /*******************************************************************************
2 * Filename: target_core_alua.c
3 *
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
5 *
6 * (c) Copyright 2009-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/delay.h>
30 #include <linux/export.h>
31 #include <linux/fcntl.h>
32 #include <linux/file.h>
33 #include <linux/fs.h>
34 #include <scsi/scsi_proto.h>
35 #include <asm/unaligned.h>
36
37 #include <target/target_core_base.h>
38 #include <target/target_core_backend.h>
39 #include <target/target_core_fabric.h>
40
41 #include "target_core_internal.h"
42 #include "target_core_alua.h"
43 #include "target_core_ua.h"
44
45 static sense_reason_t core_alua_check_transition(int state, int valid,
46 int *primary, 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 put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
209 off += 2;
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 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
239 off += 2;
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 loff_t pos = 0;
900 int ret;
901
902 if (IS_ERR(file)) {
903 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
904 return -ENODEV;
905 }
906 ret = kernel_write(file, md_buf, md_buf_len, &pos);
907 if (ret < 0)
908 pr_err("Error writing ALUA metadata file: %s\n", path);
909 fput(file);
910 return (ret < 0) ? -EIO : 0;
911 }
912
913 /*
914 * Called with tg_pt_gp->tg_pt_gp_transition_mutex held
915 */
916 static int core_alua_update_tpg_primary_metadata(
917 struct t10_alua_tg_pt_gp *tg_pt_gp)
918 {
919 unsigned char *md_buf;
920 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
921 char *path;
922 int len, rc;
923
924 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
925 if (!md_buf) {
926 pr_err("Unable to allocate buf for ALUA metadata\n");
927 return -ENOMEM;
928 }
929
930 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
931 "tg_pt_gp_id=%hu\n"
932 "alua_access_state=0x%02x\n"
933 "alua_access_status=0x%02x\n",
934 tg_pt_gp->tg_pt_gp_id,
935 tg_pt_gp->tg_pt_gp_alua_access_state,
936 tg_pt_gp->tg_pt_gp_alua_access_status);
937
938 rc = -ENOMEM;
939 path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
940 &wwn->unit_serial[0],
941 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
942 if (path) {
943 rc = core_alua_write_tpg_metadata(path, md_buf, len);
944 kfree(path);
945 }
946 kfree(md_buf);
947 return rc;
948 }
949
950 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
951 {
952 struct se_dev_entry *se_deve;
953 struct se_lun *lun;
954 struct se_lun_acl *lacl;
955
956 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
957 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
958 lun_tg_pt_gp_link) {
959 /*
960 * After an implicit target port asymmetric access state
961 * change, a device server shall establish a unit attention
962 * condition for the initiator port associated with every I_T
963 * nexus with the additional sense code set to ASYMMETRIC
964 * ACCESS STATE CHANGED.
965 *
966 * After an explicit target port asymmetric access state
967 * change, a device server shall establish a unit attention
968 * condition with the additional sense code set to ASYMMETRIC
969 * ACCESS STATE CHANGED for the initiator port associated with
970 * every I_T nexus other than the I_T nexus on which the SET
971 * TARGET PORT GROUPS command
972 */
973 if (!percpu_ref_tryget_live(&lun->lun_ref))
974 continue;
975 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
976
977 spin_lock(&lun->lun_deve_lock);
978 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
979 lacl = rcu_dereference_check(se_deve->se_lun_acl,
980 lockdep_is_held(&lun->lun_deve_lock));
981
982 /*
983 * spc4r37 p.242:
984 * After an explicit target port asymmetric access
985 * state change, a device server shall establish a
986 * unit attention condition with the additional sense
987 * code set to ASYMMETRIC ACCESS STATE CHANGED for
988 * the initiator port associated with every I_T nexus
989 * other than the I_T nexus on which the SET TARGET
990 * PORT GROUPS command was received.
991 */
992 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
993 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
994 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
995 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
996 continue;
997
998 /*
999 * se_deve->se_lun_acl pointer may be NULL for a
1000 * entry created without explicit Node+MappedLUN ACLs
1001 */
1002 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1003 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
1004 continue;
1005
1006 core_scsi3_ua_allocate(se_deve, 0x2A,
1007 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1008 }
1009 spin_unlock(&lun->lun_deve_lock);
1010
1011 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1012 percpu_ref_put(&lun->lun_ref);
1013 }
1014 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1015 }
1016
1017 static int core_alua_do_transition_tg_pt(
1018 struct t10_alua_tg_pt_gp *tg_pt_gp,
1019 int new_state,
1020 int explicit)
1021 {
1022 int prev_state;
1023
1024 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1025 /* Nothing to be done here */
1026 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
1027 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1028 return 0;
1029 }
1030
1031 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
1032 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1033 return -EAGAIN;
1034 }
1035
1036 /*
1037 * Save the old primary ALUA access state, and set the current state
1038 * to ALUA_ACCESS_STATE_TRANSITION.
1039 */
1040 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
1041 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
1042 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1043 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1044 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1045
1046 core_alua_queue_state_change_ua(tg_pt_gp);
1047
1048 if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
1049 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1050 return 0;
1051 }
1052
1053 /*
1054 * Check for the optional ALUA primary state transition delay
1055 */
1056 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1057 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1058
1059 /*
1060 * Set the current primary ALUA access state to the requested new state
1061 */
1062 tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
1063
1064 /*
1065 * Update the ALUA metadata buf that has been allocated in
1066 * core_alua_do_port_transition(), this metadata will be written
1067 * to struct file.
1068 *
1069 * Note that there is the case where we do not want to update the
1070 * metadata when the saved metadata is being parsed in userspace
1071 * when setting the existing port access state and access status.
1072 *
1073 * Also note that the failure to write out the ALUA metadata to
1074 * struct file does NOT affect the actual ALUA transition.
1075 */
1076 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1077 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1078 }
1079
1080 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1081 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1082 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1083 tg_pt_gp->tg_pt_gp_id,
1084 core_alua_dump_state(prev_state),
1085 core_alua_dump_state(new_state));
1086
1087 core_alua_queue_state_change_ua(tg_pt_gp);
1088
1089 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1090 return 0;
1091 }
1092
1093 int core_alua_do_port_transition(
1094 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1095 struct se_device *l_dev,
1096 struct se_lun *l_lun,
1097 struct se_node_acl *l_nacl,
1098 int new_state,
1099 int explicit)
1100 {
1101 struct se_device *dev;
1102 struct t10_alua_lu_gp *lu_gp;
1103 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1104 struct t10_alua_tg_pt_gp *tg_pt_gp;
1105 int primary, valid_states, rc = 0;
1106
1107 if (l_dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
1108 return -ENODEV;
1109
1110 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1111 if (core_alua_check_transition(new_state, valid_states, &primary,
1112 explicit) != 0)
1113 return -EINVAL;
1114
1115 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1116 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1117 lu_gp = local_lu_gp_mem->lu_gp;
1118 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1119 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1120 /*
1121 * For storage objects that are members of the 'default_lu_gp',
1122 * we only do transition on the passed *l_tp_pt_gp, and not
1123 * on all of the matching target port groups IDs in default_lu_gp.
1124 */
1125 if (!lu_gp->lu_gp_id) {
1126 /*
1127 * core_alua_do_transition_tg_pt() will always return
1128 * success.
1129 */
1130 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1131 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1132 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1133 new_state, explicit);
1134 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1135 return rc;
1136 }
1137 /*
1138 * For all other LU groups aside from 'default_lu_gp', walk all of
1139 * the associated storage objects looking for a matching target port
1140 * group ID from the local target port group.
1141 */
1142 spin_lock(&lu_gp->lu_gp_lock);
1143 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1144 lu_gp_mem_list) {
1145
1146 dev = lu_gp_mem->lu_gp_mem_dev;
1147 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1148 spin_unlock(&lu_gp->lu_gp_lock);
1149
1150 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1151 list_for_each_entry(tg_pt_gp,
1152 &dev->t10_alua.tg_pt_gps_list,
1153 tg_pt_gp_list) {
1154
1155 if (!tg_pt_gp->tg_pt_gp_valid_id)
1156 continue;
1157 /*
1158 * If the target behavior port asymmetric access state
1159 * is changed for any target port group accessible via
1160 * a logical unit within a LU group, the target port
1161 * behavior group asymmetric access states for the same
1162 * target port group accessible via other logical units
1163 * in that LU group will also change.
1164 */
1165 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1166 continue;
1167
1168 if (l_tg_pt_gp == tg_pt_gp) {
1169 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1170 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1171 } else {
1172 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1173 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1174 }
1175 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1176 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1177 /*
1178 * core_alua_do_transition_tg_pt() will always return
1179 * success.
1180 */
1181 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1182 new_state, explicit);
1183
1184 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1185 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1186 if (rc)
1187 break;
1188 }
1189 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1190
1191 spin_lock(&lu_gp->lu_gp_lock);
1192 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1193 }
1194 spin_unlock(&lu_gp->lu_gp_lock);
1195
1196 if (!rc) {
1197 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1198 " Group IDs: %hu %s transition to primary state: %s\n",
1199 config_item_name(&lu_gp->lu_gp_group.cg_item),
1200 l_tg_pt_gp->tg_pt_gp_id,
1201 (explicit) ? "explicit" : "implicit",
1202 core_alua_dump_state(new_state));
1203 }
1204
1205 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1206 return rc;
1207 }
1208
1209 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1210 {
1211 struct se_portal_group *se_tpg = lun->lun_tpg;
1212 unsigned char *md_buf;
1213 char *path;
1214 int len, rc;
1215
1216 mutex_lock(&lun->lun_tg_pt_md_mutex);
1217
1218 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1219 if (!md_buf) {
1220 pr_err("Unable to allocate buf for ALUA metadata\n");
1221 rc = -ENOMEM;
1222 goto out_unlock;
1223 }
1224
1225 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1226 "alua_tg_pt_status=0x%02x\n",
1227 atomic_read(&lun->lun_tg_pt_secondary_offline),
1228 lun->lun_tg_pt_secondary_stat);
1229
1230 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
1231 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
1232 db_root, se_tpg->se_tpg_tfo->get_fabric_name(),
1233 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1234 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
1235 lun->unpacked_lun);
1236 } else {
1237 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
1238 db_root, se_tpg->se_tpg_tfo->get_fabric_name(),
1239 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1240 lun->unpacked_lun);
1241 }
1242 if (!path) {
1243 rc = -ENOMEM;
1244 goto out_free;
1245 }
1246
1247 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1248 kfree(path);
1249 out_free:
1250 kfree(md_buf);
1251 out_unlock:
1252 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1253 return rc;
1254 }
1255
1256 static int core_alua_set_tg_pt_secondary_state(
1257 struct se_lun *lun,
1258 int explicit,
1259 int offline)
1260 {
1261 struct t10_alua_tg_pt_gp *tg_pt_gp;
1262 int trans_delay_msecs;
1263
1264 spin_lock(&lun->lun_tg_pt_gp_lock);
1265 tg_pt_gp = lun->lun_tg_pt_gp;
1266 if (!tg_pt_gp) {
1267 spin_unlock(&lun->lun_tg_pt_gp_lock);
1268 pr_err("Unable to complete secondary state"
1269 " transition\n");
1270 return -EINVAL;
1271 }
1272 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1273 /*
1274 * Set the secondary ALUA target port access state to OFFLINE
1275 * or release the previously secondary state for struct se_lun
1276 */
1277 if (offline)
1278 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1279 else
1280 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1281
1282 lun->lun_tg_pt_secondary_stat = (explicit) ?
1283 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1284 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1285
1286 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1287 " to secondary access state: %s\n", (explicit) ? "explicit" :
1288 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1289 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1290
1291 spin_unlock(&lun->lun_tg_pt_gp_lock);
1292 /*
1293 * Do the optional transition delay after we set the secondary
1294 * ALUA access state.
1295 */
1296 if (trans_delay_msecs != 0)
1297 msleep_interruptible(trans_delay_msecs);
1298 /*
1299 * See if we need to update the ALUA fabric port metadata for
1300 * secondary state and status
1301 */
1302 if (lun->lun_tg_pt_secondary_write_md)
1303 core_alua_update_tpg_secondary_metadata(lun);
1304
1305 return 0;
1306 }
1307
1308 struct t10_alua_lba_map *
1309 core_alua_allocate_lba_map(struct list_head *list,
1310 u64 first_lba, u64 last_lba)
1311 {
1312 struct t10_alua_lba_map *lba_map;
1313
1314 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1315 if (!lba_map) {
1316 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1317 return ERR_PTR(-ENOMEM);
1318 }
1319 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1320 lba_map->lba_map_first_lba = first_lba;
1321 lba_map->lba_map_last_lba = last_lba;
1322
1323 list_add_tail(&lba_map->lba_map_list, list);
1324 return lba_map;
1325 }
1326
1327 int
1328 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1329 int pg_id, int state)
1330 {
1331 struct t10_alua_lba_map_member *lba_map_mem;
1332
1333 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1334 lba_map_mem_list) {
1335 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1336 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1337 return -EINVAL;
1338 }
1339 }
1340
1341 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1342 if (!lba_map_mem) {
1343 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1344 return -ENOMEM;
1345 }
1346 lba_map_mem->lba_map_mem_alua_state = state;
1347 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1348
1349 list_add_tail(&lba_map_mem->lba_map_mem_list,
1350 &lba_map->lba_map_mem_list);
1351 return 0;
1352 }
1353
1354 void
1355 core_alua_free_lba_map(struct list_head *lba_list)
1356 {
1357 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1358 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1359
1360 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1361 lba_map_list) {
1362 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1363 &lba_map->lba_map_mem_list,
1364 lba_map_mem_list) {
1365 list_del(&lba_map_mem->lba_map_mem_list);
1366 kmem_cache_free(t10_alua_lba_map_mem_cache,
1367 lba_map_mem);
1368 }
1369 list_del(&lba_map->lba_map_list);
1370 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1371 }
1372 }
1373
1374 void
1375 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1376 int segment_size, int segment_mult)
1377 {
1378 struct list_head old_lba_map_list;
1379 struct t10_alua_tg_pt_gp *tg_pt_gp;
1380 int activate = 0, supported;
1381
1382 INIT_LIST_HEAD(&old_lba_map_list);
1383 spin_lock(&dev->t10_alua.lba_map_lock);
1384 dev->t10_alua.lba_map_segment_size = segment_size;
1385 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1386 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1387 if (lba_map_list) {
1388 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1389 activate = 1;
1390 }
1391 spin_unlock(&dev->t10_alua.lba_map_lock);
1392 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1393 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1394 tg_pt_gp_list) {
1395
1396 if (!tg_pt_gp->tg_pt_gp_valid_id)
1397 continue;
1398 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1399 if (activate)
1400 supported |= ALUA_LBD_SUP;
1401 else
1402 supported &= ~ALUA_LBD_SUP;
1403 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1404 }
1405 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1406 core_alua_free_lba_map(&old_lba_map_list);
1407 }
1408
1409 struct t10_alua_lu_gp *
1410 core_alua_allocate_lu_gp(const char *name, int def_group)
1411 {
1412 struct t10_alua_lu_gp *lu_gp;
1413
1414 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1415 if (!lu_gp) {
1416 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1417 return ERR_PTR(-ENOMEM);
1418 }
1419 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1420 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1421 spin_lock_init(&lu_gp->lu_gp_lock);
1422 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1423
1424 if (def_group) {
1425 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1426 lu_gp->lu_gp_valid_id = 1;
1427 alua_lu_gps_count++;
1428 }
1429
1430 return lu_gp;
1431 }
1432
1433 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1434 {
1435 struct t10_alua_lu_gp *lu_gp_tmp;
1436 u16 lu_gp_id_tmp;
1437 /*
1438 * The lu_gp->lu_gp_id may only be set once..
1439 */
1440 if (lu_gp->lu_gp_valid_id) {
1441 pr_warn("ALUA LU Group already has a valid ID,"
1442 " ignoring request\n");
1443 return -EINVAL;
1444 }
1445
1446 spin_lock(&lu_gps_lock);
1447 if (alua_lu_gps_count == 0x0000ffff) {
1448 pr_err("Maximum ALUA alua_lu_gps_count:"
1449 " 0x0000ffff reached\n");
1450 spin_unlock(&lu_gps_lock);
1451 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1452 return -ENOSPC;
1453 }
1454 again:
1455 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1456 alua_lu_gps_counter++;
1457
1458 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1459 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1460 if (!lu_gp_id)
1461 goto again;
1462
1463 pr_warn("ALUA Logical Unit Group ID: %hu"
1464 " already exists, ignoring request\n",
1465 lu_gp_id);
1466 spin_unlock(&lu_gps_lock);
1467 return -EINVAL;
1468 }
1469 }
1470
1471 lu_gp->lu_gp_id = lu_gp_id_tmp;
1472 lu_gp->lu_gp_valid_id = 1;
1473 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1474 alua_lu_gps_count++;
1475 spin_unlock(&lu_gps_lock);
1476
1477 return 0;
1478 }
1479
1480 static struct t10_alua_lu_gp_member *
1481 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1482 {
1483 struct t10_alua_lu_gp_member *lu_gp_mem;
1484
1485 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1486 if (!lu_gp_mem) {
1487 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1488 return ERR_PTR(-ENOMEM);
1489 }
1490 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1491 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1492 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1493
1494 lu_gp_mem->lu_gp_mem_dev = dev;
1495 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1496
1497 return lu_gp_mem;
1498 }
1499
1500 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1501 {
1502 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1503 /*
1504 * Once we have reached this point, config_item_put() has
1505 * already been called from target_core_alua_drop_lu_gp().
1506 *
1507 * Here, we remove the *lu_gp from the global list so that
1508 * no associations can be made while we are releasing
1509 * struct t10_alua_lu_gp.
1510 */
1511 spin_lock(&lu_gps_lock);
1512 list_del(&lu_gp->lu_gp_node);
1513 alua_lu_gps_count--;
1514 spin_unlock(&lu_gps_lock);
1515 /*
1516 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1517 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1518 * released with core_alua_put_lu_gp_from_name()
1519 */
1520 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1521 cpu_relax();
1522 /*
1523 * Release reference to struct t10_alua_lu_gp * from all associated
1524 * struct se_device.
1525 */
1526 spin_lock(&lu_gp->lu_gp_lock);
1527 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1528 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1529 if (lu_gp_mem->lu_gp_assoc) {
1530 list_del(&lu_gp_mem->lu_gp_mem_list);
1531 lu_gp->lu_gp_members--;
1532 lu_gp_mem->lu_gp_assoc = 0;
1533 }
1534 spin_unlock(&lu_gp->lu_gp_lock);
1535 /*
1536 *
1537 * lu_gp_mem is associated with a single
1538 * struct se_device->dev_alua_lu_gp_mem, and is released when
1539 * struct se_device is released via core_alua_free_lu_gp_mem().
1540 *
1541 * If the passed lu_gp does NOT match the default_lu_gp, assume
1542 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1543 */
1544 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1545 if (lu_gp != default_lu_gp)
1546 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1547 default_lu_gp);
1548 else
1549 lu_gp_mem->lu_gp = NULL;
1550 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1551
1552 spin_lock(&lu_gp->lu_gp_lock);
1553 }
1554 spin_unlock(&lu_gp->lu_gp_lock);
1555
1556 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1557 }
1558
1559 void core_alua_free_lu_gp_mem(struct se_device *dev)
1560 {
1561 struct t10_alua_lu_gp *lu_gp;
1562 struct t10_alua_lu_gp_member *lu_gp_mem;
1563
1564 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1565 if (!lu_gp_mem)
1566 return;
1567
1568 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1569 cpu_relax();
1570
1571 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1572 lu_gp = lu_gp_mem->lu_gp;
1573 if (lu_gp) {
1574 spin_lock(&lu_gp->lu_gp_lock);
1575 if (lu_gp_mem->lu_gp_assoc) {
1576 list_del(&lu_gp_mem->lu_gp_mem_list);
1577 lu_gp->lu_gp_members--;
1578 lu_gp_mem->lu_gp_assoc = 0;
1579 }
1580 spin_unlock(&lu_gp->lu_gp_lock);
1581 lu_gp_mem->lu_gp = NULL;
1582 }
1583 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1584
1585 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1586 }
1587
1588 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1589 {
1590 struct t10_alua_lu_gp *lu_gp;
1591 struct config_item *ci;
1592
1593 spin_lock(&lu_gps_lock);
1594 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1595 if (!lu_gp->lu_gp_valid_id)
1596 continue;
1597 ci = &lu_gp->lu_gp_group.cg_item;
1598 if (!strcmp(config_item_name(ci), name)) {
1599 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1600 spin_unlock(&lu_gps_lock);
1601 return lu_gp;
1602 }
1603 }
1604 spin_unlock(&lu_gps_lock);
1605
1606 return NULL;
1607 }
1608
1609 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1610 {
1611 spin_lock(&lu_gps_lock);
1612 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1613 spin_unlock(&lu_gps_lock);
1614 }
1615
1616 /*
1617 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1618 */
1619 void __core_alua_attach_lu_gp_mem(
1620 struct t10_alua_lu_gp_member *lu_gp_mem,
1621 struct t10_alua_lu_gp *lu_gp)
1622 {
1623 spin_lock(&lu_gp->lu_gp_lock);
1624 lu_gp_mem->lu_gp = lu_gp;
1625 lu_gp_mem->lu_gp_assoc = 1;
1626 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1627 lu_gp->lu_gp_members++;
1628 spin_unlock(&lu_gp->lu_gp_lock);
1629 }
1630
1631 /*
1632 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1633 */
1634 void __core_alua_drop_lu_gp_mem(
1635 struct t10_alua_lu_gp_member *lu_gp_mem,
1636 struct t10_alua_lu_gp *lu_gp)
1637 {
1638 spin_lock(&lu_gp->lu_gp_lock);
1639 list_del(&lu_gp_mem->lu_gp_mem_list);
1640 lu_gp_mem->lu_gp = NULL;
1641 lu_gp_mem->lu_gp_assoc = 0;
1642 lu_gp->lu_gp_members--;
1643 spin_unlock(&lu_gp->lu_gp_lock);
1644 }
1645
1646 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1647 const char *name, int def_group)
1648 {
1649 struct t10_alua_tg_pt_gp *tg_pt_gp;
1650
1651 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1652 if (!tg_pt_gp) {
1653 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1654 return NULL;
1655 }
1656 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1657 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1658 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
1659 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1660 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1661 tg_pt_gp->tg_pt_gp_dev = dev;
1662 tg_pt_gp->tg_pt_gp_alua_access_state =
1663 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
1664 /*
1665 * Enable both explicit and implicit ALUA support by default
1666 */
1667 tg_pt_gp->tg_pt_gp_alua_access_type =
1668 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1669 /*
1670 * Set the default Active/NonOptimized Delay in milliseconds
1671 */
1672 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1673 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1674 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1675
1676 /*
1677 * Enable all supported states
1678 */
1679 tg_pt_gp->tg_pt_gp_alua_supported_states =
1680 ALUA_T_SUP | ALUA_O_SUP |
1681 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1682
1683 if (def_group) {
1684 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1685 tg_pt_gp->tg_pt_gp_id =
1686 dev->t10_alua.alua_tg_pt_gps_counter++;
1687 tg_pt_gp->tg_pt_gp_valid_id = 1;
1688 dev->t10_alua.alua_tg_pt_gps_count++;
1689 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1690 &dev->t10_alua.tg_pt_gps_list);
1691 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1692 }
1693
1694 return tg_pt_gp;
1695 }
1696
1697 int core_alua_set_tg_pt_gp_id(
1698 struct t10_alua_tg_pt_gp *tg_pt_gp,
1699 u16 tg_pt_gp_id)
1700 {
1701 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1702 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1703 u16 tg_pt_gp_id_tmp;
1704
1705 /*
1706 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1707 */
1708 if (tg_pt_gp->tg_pt_gp_valid_id) {
1709 pr_warn("ALUA TG PT Group already has a valid ID,"
1710 " ignoring request\n");
1711 return -EINVAL;
1712 }
1713
1714 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1715 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1716 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1717 " 0x0000ffff reached\n");
1718 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1719 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1720 return -ENOSPC;
1721 }
1722 again:
1723 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1724 dev->t10_alua.alua_tg_pt_gps_counter++;
1725
1726 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1727 tg_pt_gp_list) {
1728 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1729 if (!tg_pt_gp_id)
1730 goto again;
1731
1732 pr_err("ALUA Target Port Group ID: %hu already"
1733 " exists, ignoring request\n", tg_pt_gp_id);
1734 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1735 return -EINVAL;
1736 }
1737 }
1738
1739 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1740 tg_pt_gp->tg_pt_gp_valid_id = 1;
1741 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1742 &dev->t10_alua.tg_pt_gps_list);
1743 dev->t10_alua.alua_tg_pt_gps_count++;
1744 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1745
1746 return 0;
1747 }
1748
1749 void core_alua_free_tg_pt_gp(
1750 struct t10_alua_tg_pt_gp *tg_pt_gp)
1751 {
1752 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1753 struct se_lun *lun, *next;
1754
1755 /*
1756 * Once we have reached this point, config_item_put() has already
1757 * been called from target_core_alua_drop_tg_pt_gp().
1758 *
1759 * Here we remove *tg_pt_gp from the global list so that
1760 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1761 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1762 */
1763 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1764 list_del(&tg_pt_gp->tg_pt_gp_list);
1765 dev->t10_alua.alua_tg_pt_gps_counter--;
1766 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1767
1768 /*
1769 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1770 * core_alua_get_tg_pt_gp_by_name() in
1771 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1772 * to be released with core_alua_put_tg_pt_gp_from_name().
1773 */
1774 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1775 cpu_relax();
1776
1777 /*
1778 * Release reference to struct t10_alua_tg_pt_gp from all associated
1779 * struct se_port.
1780 */
1781 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1782 list_for_each_entry_safe(lun, next,
1783 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1784 list_del_init(&lun->lun_tg_pt_gp_link);
1785 tg_pt_gp->tg_pt_gp_members--;
1786
1787 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1788 /*
1789 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1790 * assume we want to re-associate a given tg_pt_gp_mem with
1791 * default_tg_pt_gp.
1792 */
1793 spin_lock(&lun->lun_tg_pt_gp_lock);
1794 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1795 __target_attach_tg_pt_gp(lun,
1796 dev->t10_alua.default_tg_pt_gp);
1797 } else
1798 lun->lun_tg_pt_gp = NULL;
1799 spin_unlock(&lun->lun_tg_pt_gp_lock);
1800
1801 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1802 }
1803 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1804
1805 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1806 }
1807
1808 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1809 struct se_device *dev, const char *name)
1810 {
1811 struct t10_alua_tg_pt_gp *tg_pt_gp;
1812 struct config_item *ci;
1813
1814 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1815 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1816 tg_pt_gp_list) {
1817 if (!tg_pt_gp->tg_pt_gp_valid_id)
1818 continue;
1819 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1820 if (!strcmp(config_item_name(ci), name)) {
1821 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1822 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1823 return tg_pt_gp;
1824 }
1825 }
1826 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1827
1828 return NULL;
1829 }
1830
1831 static void core_alua_put_tg_pt_gp_from_name(
1832 struct t10_alua_tg_pt_gp *tg_pt_gp)
1833 {
1834 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1835
1836 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1837 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1838 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1839 }
1840
1841 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1842 struct t10_alua_tg_pt_gp *tg_pt_gp)
1843 {
1844 struct se_dev_entry *se_deve;
1845
1846 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1847
1848 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1849 lun->lun_tg_pt_gp = tg_pt_gp;
1850 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1851 tg_pt_gp->tg_pt_gp_members++;
1852 spin_lock(&lun->lun_deve_lock);
1853 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1854 core_scsi3_ua_allocate(se_deve, 0x3f,
1855 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1856 spin_unlock(&lun->lun_deve_lock);
1857 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1858 }
1859
1860 void target_attach_tg_pt_gp(struct se_lun *lun,
1861 struct t10_alua_tg_pt_gp *tg_pt_gp)
1862 {
1863 spin_lock(&lun->lun_tg_pt_gp_lock);
1864 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1865 spin_unlock(&lun->lun_tg_pt_gp_lock);
1866 }
1867
1868 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1869 struct t10_alua_tg_pt_gp *tg_pt_gp)
1870 {
1871 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1872
1873 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1874 list_del_init(&lun->lun_tg_pt_gp_link);
1875 tg_pt_gp->tg_pt_gp_members--;
1876 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1877
1878 lun->lun_tg_pt_gp = NULL;
1879 }
1880
1881 void target_detach_tg_pt_gp(struct se_lun *lun)
1882 {
1883 struct t10_alua_tg_pt_gp *tg_pt_gp;
1884
1885 spin_lock(&lun->lun_tg_pt_gp_lock);
1886 tg_pt_gp = lun->lun_tg_pt_gp;
1887 if (tg_pt_gp)
1888 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1889 spin_unlock(&lun->lun_tg_pt_gp_lock);
1890 }
1891
1892 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1893 {
1894 struct config_item *tg_pt_ci;
1895 struct t10_alua_tg_pt_gp *tg_pt_gp;
1896 ssize_t len = 0;
1897
1898 spin_lock(&lun->lun_tg_pt_gp_lock);
1899 tg_pt_gp = lun->lun_tg_pt_gp;
1900 if (tg_pt_gp) {
1901 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1902 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1903 " %hu\nTG Port Primary Access State: %s\nTG Port "
1904 "Primary Access Status: %s\nTG Port Secondary Access"
1905 " State: %s\nTG Port Secondary Access Status: %s\n",
1906 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1907 core_alua_dump_state(
1908 tg_pt_gp->tg_pt_gp_alua_access_state),
1909 core_alua_dump_status(
1910 tg_pt_gp->tg_pt_gp_alua_access_status),
1911 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1912 "Offline" : "None",
1913 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1914 }
1915 spin_unlock(&lun->lun_tg_pt_gp_lock);
1916
1917 return len;
1918 }
1919
1920 ssize_t core_alua_store_tg_pt_gp_info(
1921 struct se_lun *lun,
1922 const char *page,
1923 size_t count)
1924 {
1925 struct se_portal_group *tpg = lun->lun_tpg;
1926 /*
1927 * rcu_dereference_raw protected by se_lun->lun_group symlink
1928 * reference to se_device->dev_group.
1929 */
1930 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1931 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1932 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1933 int move = 0;
1934
1935 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
1936 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1937 return -ENODEV;
1938
1939 if (count > TG_PT_GROUP_NAME_BUF) {
1940 pr_err("ALUA Target Port Group alias too large!\n");
1941 return -EINVAL;
1942 }
1943 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1944 memcpy(buf, page, count);
1945 /*
1946 * Any ALUA target port group alias besides "NULL" means we will be
1947 * making a new group association.
1948 */
1949 if (strcmp(strstrip(buf), "NULL")) {
1950 /*
1951 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1952 * struct t10_alua_tg_pt_gp. This reference is released with
1953 * core_alua_put_tg_pt_gp_from_name() below.
1954 */
1955 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1956 strstrip(buf));
1957 if (!tg_pt_gp_new)
1958 return -ENODEV;
1959 }
1960
1961 spin_lock(&lun->lun_tg_pt_gp_lock);
1962 tg_pt_gp = lun->lun_tg_pt_gp;
1963 if (tg_pt_gp) {
1964 /*
1965 * Clearing an existing tg_pt_gp association, and replacing
1966 * with the default_tg_pt_gp.
1967 */
1968 if (!tg_pt_gp_new) {
1969 pr_debug("Target_Core_ConfigFS: Moving"
1970 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1971 " alua/%s, ID: %hu back to"
1972 " default_tg_pt_gp\n",
1973 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1974 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1975 config_item_name(&lun->lun_group.cg_item),
1976 config_item_name(
1977 &tg_pt_gp->tg_pt_gp_group.cg_item),
1978 tg_pt_gp->tg_pt_gp_id);
1979
1980 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1981 __target_attach_tg_pt_gp(lun,
1982 dev->t10_alua.default_tg_pt_gp);
1983 spin_unlock(&lun->lun_tg_pt_gp_lock);
1984
1985 return count;
1986 }
1987 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1988 move = 1;
1989 }
1990
1991 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
1992 spin_unlock(&lun->lun_tg_pt_gp_lock);
1993 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1994 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1995 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1996 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1997 config_item_name(&lun->lun_group.cg_item),
1998 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1999 tg_pt_gp_new->tg_pt_gp_id);
2000
2001 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2002 return count;
2003 }
2004
2005 ssize_t core_alua_show_access_type(
2006 struct t10_alua_tg_pt_gp *tg_pt_gp,
2007 char *page)
2008 {
2009 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2010 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2011 return sprintf(page, "Implicit and Explicit\n");
2012 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2013 return sprintf(page, "Implicit\n");
2014 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2015 return sprintf(page, "Explicit\n");
2016 else
2017 return sprintf(page, "None\n");
2018 }
2019
2020 ssize_t core_alua_store_access_type(
2021 struct t10_alua_tg_pt_gp *tg_pt_gp,
2022 const char *page,
2023 size_t count)
2024 {
2025 unsigned long tmp;
2026 int ret;
2027
2028 ret = kstrtoul(page, 0, &tmp);
2029 if (ret < 0) {
2030 pr_err("Unable to extract alua_access_type\n");
2031 return ret;
2032 }
2033 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2034 pr_err("Illegal value for alua_access_type:"
2035 " %lu\n", tmp);
2036 return -EINVAL;
2037 }
2038 if (tmp == 3)
2039 tg_pt_gp->tg_pt_gp_alua_access_type =
2040 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2041 else if (tmp == 2)
2042 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2043 else if (tmp == 1)
2044 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2045 else
2046 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2047
2048 return count;
2049 }
2050
2051 ssize_t core_alua_show_nonop_delay_msecs(
2052 struct t10_alua_tg_pt_gp *tg_pt_gp,
2053 char *page)
2054 {
2055 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2056 }
2057
2058 ssize_t core_alua_store_nonop_delay_msecs(
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 nonop_delay_msecs\n");
2069 return ret;
2070 }
2071 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2072 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2073 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2074 ALUA_MAX_NONOP_DELAY_MSECS);
2075 return -EINVAL;
2076 }
2077 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2078
2079 return count;
2080 }
2081
2082 ssize_t core_alua_show_trans_delay_msecs(
2083 struct t10_alua_tg_pt_gp *tg_pt_gp,
2084 char *page)
2085 {
2086 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2087 }
2088
2089 ssize_t core_alua_store_trans_delay_msecs(
2090 struct t10_alua_tg_pt_gp *tg_pt_gp,
2091 const char *page,
2092 size_t count)
2093 {
2094 unsigned long tmp;
2095 int ret;
2096
2097 ret = kstrtoul(page, 0, &tmp);
2098 if (ret < 0) {
2099 pr_err("Unable to extract trans_delay_msecs\n");
2100 return ret;
2101 }
2102 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2103 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2104 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2105 ALUA_MAX_TRANS_DELAY_MSECS);
2106 return -EINVAL;
2107 }
2108 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2109
2110 return count;
2111 }
2112
2113 ssize_t core_alua_show_implicit_trans_secs(
2114 struct t10_alua_tg_pt_gp *tg_pt_gp,
2115 char *page)
2116 {
2117 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2118 }
2119
2120 ssize_t core_alua_store_implicit_trans_secs(
2121 struct t10_alua_tg_pt_gp *tg_pt_gp,
2122 const char *page,
2123 size_t count)
2124 {
2125 unsigned long tmp;
2126 int ret;
2127
2128 ret = kstrtoul(page, 0, &tmp);
2129 if (ret < 0) {
2130 pr_err("Unable to extract implicit_trans_secs\n");
2131 return ret;
2132 }
2133 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2134 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2135 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2136 ALUA_MAX_IMPLICIT_TRANS_SECS);
2137 return -EINVAL;
2138 }
2139 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2140
2141 return count;
2142 }
2143
2144 ssize_t core_alua_show_preferred_bit(
2145 struct t10_alua_tg_pt_gp *tg_pt_gp,
2146 char *page)
2147 {
2148 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2149 }
2150
2151 ssize_t core_alua_store_preferred_bit(
2152 struct t10_alua_tg_pt_gp *tg_pt_gp,
2153 const char *page,
2154 size_t count)
2155 {
2156 unsigned long tmp;
2157 int ret;
2158
2159 ret = kstrtoul(page, 0, &tmp);
2160 if (ret < 0) {
2161 pr_err("Unable to extract preferred ALUA value\n");
2162 return ret;
2163 }
2164 if ((tmp != 0) && (tmp != 1)) {
2165 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2166 return -EINVAL;
2167 }
2168 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2169
2170 return count;
2171 }
2172
2173 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2174 {
2175 return sprintf(page, "%d\n",
2176 atomic_read(&lun->lun_tg_pt_secondary_offline));
2177 }
2178
2179 ssize_t core_alua_store_offline_bit(
2180 struct se_lun *lun,
2181 const char *page,
2182 size_t count)
2183 {
2184 /*
2185 * rcu_dereference_raw protected by se_lun->lun_group symlink
2186 * reference to se_device->dev_group.
2187 */
2188 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2189 unsigned long tmp;
2190 int ret;
2191
2192 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
2193 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2194 return -ENODEV;
2195
2196 ret = kstrtoul(page, 0, &tmp);
2197 if (ret < 0) {
2198 pr_err("Unable to extract alua_tg_pt_offline value\n");
2199 return ret;
2200 }
2201 if ((tmp != 0) && (tmp != 1)) {
2202 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2203 tmp);
2204 return -EINVAL;
2205 }
2206
2207 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2208 if (ret < 0)
2209 return -EINVAL;
2210
2211 return count;
2212 }
2213
2214 ssize_t core_alua_show_secondary_status(
2215 struct se_lun *lun,
2216 char *page)
2217 {
2218 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2219 }
2220
2221 ssize_t core_alua_store_secondary_status(
2222 struct se_lun *lun,
2223 const char *page,
2224 size_t count)
2225 {
2226 unsigned long tmp;
2227 int ret;
2228
2229 ret = kstrtoul(page, 0, &tmp);
2230 if (ret < 0) {
2231 pr_err("Unable to extract alua_tg_pt_status\n");
2232 return ret;
2233 }
2234 if ((tmp != ALUA_STATUS_NONE) &&
2235 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2236 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2237 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2238 tmp);
2239 return -EINVAL;
2240 }
2241 lun->lun_tg_pt_secondary_stat = (int)tmp;
2242
2243 return count;
2244 }
2245
2246 ssize_t core_alua_show_secondary_write_metadata(
2247 struct se_lun *lun,
2248 char *page)
2249 {
2250 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2251 }
2252
2253 ssize_t core_alua_store_secondary_write_metadata(
2254 struct se_lun *lun,
2255 const char *page,
2256 size_t count)
2257 {
2258 unsigned long tmp;
2259 int ret;
2260
2261 ret = kstrtoul(page, 0, &tmp);
2262 if (ret < 0) {
2263 pr_err("Unable to extract alua_tg_pt_write_md\n");
2264 return ret;
2265 }
2266 if ((tmp != 0) && (tmp != 1)) {
2267 pr_err("Illegal value for alua_tg_pt_write_md:"
2268 " %lu\n", tmp);
2269 return -EINVAL;
2270 }
2271 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2272
2273 return count;
2274 }
2275
2276 int core_setup_alua(struct se_device *dev)
2277 {
2278 if (!(dev->transport->transport_flags &
2279 TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
2280 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2281 struct t10_alua_lu_gp_member *lu_gp_mem;
2282
2283 /*
2284 * Associate this struct se_device with the default ALUA
2285 * LUN Group.
2286 */
2287 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2288 if (IS_ERR(lu_gp_mem))
2289 return PTR_ERR(lu_gp_mem);
2290
2291 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2292 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2293 default_lu_gp);
2294 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2295
2296 pr_debug("%s: Adding to default ALUA LU Group:"
2297 " core/alua/lu_gps/default_lu_gp\n",
2298 dev->transport->name);
2299 }
2300
2301 return 0;
2302 }
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