1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * Filename: target_core_alua.c
4 *
5 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
6 *
7 * (c) Copyright 2009-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 ******************************************************************************/
12
13 #include <linux/slab.h>
14 #include <linux/spinlock.h>
15 #include <linux/configfs.h>
16 #include <linux/delay.h>
17 #include <linux/export.h>
18 #include <linux/fcntl.h>
19 #include <linux/file.h>
20 #include <linux/fs.h>
21 #include <scsi/scsi_proto.h>
22 #include <asm/unaligned.h>
23
24 #include <target/target_core_base.h>
25 #include <target/target_core_backend.h>
26 #include <target/target_core_fabric.h>
27
28 #include "target_core_internal.h"
29 #include "target_core_alua.h"
30 #include "target_core_ua.h"
31
32 static sense_reason_t core_alua_check_transition(int state, int valid,
33 int *primary, int explicit);
34 static int core_alua_set_tg_pt_secondary_state(
35 struct se_lun *lun, int explicit, int offline);
36
37 static char *core_alua_dump_state(int state);
38
39 static void __target_attach_tg_pt_gp(struct se_lun *lun,
40 struct t10_alua_tg_pt_gp *tg_pt_gp);
41
42 static u16 alua_lu_gps_counter;
43 static u32 alua_lu_gps_count;
44
45 static DEFINE_SPINLOCK(lu_gps_lock);
46 static LIST_HEAD(lu_gps_list);
47
48 struct t10_alua_lu_gp *default_lu_gp;
49
50 /*
51 * REPORT REFERRALS
52 *
53 * See sbc3r35 section 5.23
54 */
55 sense_reason_t
target_emulate_report_referrals(struct se_cmd * cmd)56 target_emulate_report_referrals(struct se_cmd *cmd)
57 {
58 struct se_device *dev = cmd->se_dev;
59 struct t10_alua_lba_map *map;
60 struct t10_alua_lba_map_member *map_mem;
61 unsigned char *buf;
62 u32 rd_len = 0, off;
63
64 if (cmd->data_length < 4) {
65 pr_warn("REPORT REFERRALS allocation length %u too"
66 " small\n", cmd->data_length);
67 return TCM_INVALID_CDB_FIELD;
68 }
69
70 buf = transport_kmap_data_sg(cmd);
71 if (!buf)
72 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
73
74 off = 4;
75 spin_lock(&dev->t10_alua.lba_map_lock);
76 if (list_empty(&dev->t10_alua.lba_map_list)) {
77 spin_unlock(&dev->t10_alua.lba_map_lock);
78 transport_kunmap_data_sg(cmd);
79
80 return TCM_UNSUPPORTED_SCSI_OPCODE;
81 }
82
83 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
84 lba_map_list) {
85 int desc_num = off + 3;
86 int pg_num;
87
88 off += 4;
89 if (cmd->data_length > off)
90 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
91 off += 8;
92 if (cmd->data_length > off)
93 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
94 off += 8;
95 rd_len += 20;
96 pg_num = 0;
97 list_for_each_entry(map_mem, &map->lba_map_mem_list,
98 lba_map_mem_list) {
99 int alua_state = map_mem->lba_map_mem_alua_state;
100 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
101
102 if (cmd->data_length > off)
103 buf[off] = alua_state & 0x0f;
104 off += 2;
105 if (cmd->data_length > off)
106 buf[off] = (alua_pg_id >> 8) & 0xff;
107 off++;
108 if (cmd->data_length > off)
109 buf[off] = (alua_pg_id & 0xff);
110 off++;
111 rd_len += 4;
112 pg_num++;
113 }
114 if (cmd->data_length > desc_num)
115 buf[desc_num] = pg_num;
116 }
117 spin_unlock(&dev->t10_alua.lba_map_lock);
118
119 /*
120 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
121 */
122 put_unaligned_be16(rd_len, &buf[2]);
123
124 transport_kunmap_data_sg(cmd);
125
126 target_complete_cmd(cmd, SAM_STAT_GOOD);
127 return 0;
128 }
129
130 /*
131 * REPORT_TARGET_PORT_GROUPS
132 *
133 * See spc4r17 section 6.27
134 */
135 sense_reason_t
target_emulate_report_target_port_groups(struct se_cmd * cmd)136 target_emulate_report_target_port_groups(struct se_cmd *cmd)
137 {
138 struct se_device *dev = cmd->se_dev;
139 struct t10_alua_tg_pt_gp *tg_pt_gp;
140 struct se_lun *lun;
141 unsigned char *buf;
142 u32 rd_len = 0, off;
143 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
144
145 /*
146 * Skip over RESERVED area to first Target port group descriptor
147 * depending on the PARAMETER DATA FORMAT type..
148 */
149 if (ext_hdr != 0)
150 off = 8;
151 else
152 off = 4;
153
154 if (cmd->data_length < off) {
155 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
156 " small for %s header\n", cmd->data_length,
157 (ext_hdr) ? "extended" : "normal");
158 return TCM_INVALID_CDB_FIELD;
159 }
160 buf = transport_kmap_data_sg(cmd);
161 if (!buf)
162 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
163
164 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
165 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
166 tg_pt_gp_list) {
167 /* Skip empty port groups */
168 if (!tg_pt_gp->tg_pt_gp_members)
169 continue;
170 /*
171 * Check if the Target port group and Target port descriptor list
172 * based on tg_pt_gp_members count will fit into the response payload.
173 * Otherwise, bump rd_len to let the initiator know we have exceeded
174 * the allocation length and the response is truncated.
175 */
176 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
177 cmd->data_length) {
178 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
179 continue;
180 }
181 /*
182 * PREF: Preferred target port bit, determine if this
183 * bit should be set for port group.
184 */
185 if (tg_pt_gp->tg_pt_gp_pref)
186 buf[off] = 0x80;
187 /*
188 * Set the ASYMMETRIC ACCESS State
189 */
190 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff;
191 /*
192 * Set supported ASYMMETRIC ACCESS State bits
193 */
194 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
195 /*
196 * TARGET PORT GROUP
197 */
198 put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
199 off += 2;
200
201 off++; /* Skip over Reserved */
202 /*
203 * STATUS CODE
204 */
205 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
206 /*
207 * Vendor Specific field
208 */
209 buf[off++] = 0x00;
210 /*
211 * TARGET PORT COUNT
212 */
213 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
214 rd_len += 8;
215
216 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
217 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
218 lun_tg_pt_gp_link) {
219 /*
220 * Start Target Port descriptor format
221 *
222 * See spc4r17 section 6.2.7 Table 247
223 */
224 off += 2; /* Skip over Obsolete */
225 /*
226 * Set RELATIVE TARGET PORT IDENTIFIER
227 */
228 put_unaligned_be16(lun->lun_tpg->tpg_rtpi, &buf[off]);
229 off += 2;
230 rd_len += 4;
231 }
232 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
233 }
234 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
235 /*
236 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
237 */
238 put_unaligned_be32(rd_len, &buf[0]);
239
240 /*
241 * Fill in the Extended header parameter data format if requested
242 */
243 if (ext_hdr != 0) {
244 buf[4] = 0x10;
245 /*
246 * Set the implicit transition time (in seconds) for the application
247 * client to use as a base for it's transition timeout value.
248 *
249 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
250 * this CDB was received upon to determine this value individually
251 * for ALUA target port group.
252 */
253 rcu_read_lock();
254 tg_pt_gp = rcu_dereference(cmd->se_lun->lun_tg_pt_gp);
255 if (tg_pt_gp)
256 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
257 rcu_read_unlock();
258 }
259 transport_kunmap_data_sg(cmd);
260
261 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, rd_len + 4);
262 return 0;
263 }
264
265 /*
266 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
267 *
268 * See spc4r17 section 6.35
269 */
270 sense_reason_t
target_emulate_set_target_port_groups(struct se_cmd * cmd)271 target_emulate_set_target_port_groups(struct se_cmd *cmd)
272 {
273 struct se_device *dev = cmd->se_dev;
274 struct se_lun *l_lun = cmd->se_lun;
275 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
276 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
277 unsigned char *buf;
278 unsigned char *ptr;
279 sense_reason_t rc = TCM_NO_SENSE;
280 u32 len = 4; /* Skip over RESERVED area in header */
281 int alua_access_state, primary = 0, valid_states;
282 u16 tg_pt_id, rtpi;
283
284 if (cmd->data_length < 4) {
285 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
286 " small\n", cmd->data_length);
287 return TCM_INVALID_PARAMETER_LIST;
288 }
289
290 buf = transport_kmap_data_sg(cmd);
291 if (!buf)
292 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
293
294 /*
295 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
296 * for the local tg_pt_gp.
297 */
298 rcu_read_lock();
299 l_tg_pt_gp = rcu_dereference(l_lun->lun_tg_pt_gp);
300 if (!l_tg_pt_gp) {
301 rcu_read_unlock();
302 pr_err("Unable to access l_lun->tg_pt_gp\n");
303 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
304 goto out;
305 }
306
307 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
308 rcu_read_unlock();
309 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
310 " while TPGS_EXPLICIT_ALUA is disabled\n");
311 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
312 goto out;
313 }
314 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
315 rcu_read_unlock();
316
317 ptr = &buf[4]; /* Skip over RESERVED area in header */
318
319 while (len < cmd->data_length) {
320 bool found = false;
321 alua_access_state = (ptr[0] & 0x0f);
322 /*
323 * Check the received ALUA access state, and determine if
324 * the state is a primary or secondary target port asymmetric
325 * access state.
326 */
327 rc = core_alua_check_transition(alua_access_state, valid_states,
328 &primary, 1);
329 if (rc) {
330 /*
331 * If the SET TARGET PORT GROUPS attempts to establish
332 * an invalid combination of target port asymmetric
333 * access states or attempts to establish an
334 * unsupported target port asymmetric access state,
335 * then the command shall be terminated with CHECK
336 * CONDITION status, with the sense key set to ILLEGAL
337 * REQUEST, and the additional sense code set to INVALID
338 * FIELD IN PARAMETER LIST.
339 */
340 goto out;
341 }
342
343 /*
344 * If the ASYMMETRIC ACCESS STATE field (see table 267)
345 * specifies a primary target port asymmetric access state,
346 * then the TARGET PORT GROUP OR TARGET PORT field specifies
347 * a primary target port group for which the primary target
348 * port asymmetric access state shall be changed. If the
349 * ASYMMETRIC ACCESS STATE field specifies a secondary target
350 * port asymmetric access state, then the TARGET PORT GROUP OR
351 * TARGET PORT field specifies the relative target port
352 * identifier (see 3.1.120) of the target port for which the
353 * secondary target port asymmetric access state shall be
354 * changed.
355 */
356 if (primary) {
357 tg_pt_id = get_unaligned_be16(ptr + 2);
358 /*
359 * Locate the matching target port group ID from
360 * the global tg_pt_gp list
361 */
362 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
363 list_for_each_entry(tg_pt_gp,
364 &dev->t10_alua.tg_pt_gps_list,
365 tg_pt_gp_list) {
366 if (!tg_pt_gp->tg_pt_gp_valid_id)
367 continue;
368
369 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
370 continue;
371
372 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
373
374 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
375
376 if (!core_alua_do_port_transition(tg_pt_gp,
377 dev, l_lun, nacl,
378 alua_access_state, 1))
379 found = true;
380
381 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
382 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
383 break;
384 }
385 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
386 } else {
387 struct se_lun *lun;
388
389 /*
390 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
391 * the Target Port in question for the incoming
392 * SET_TARGET_PORT_GROUPS op.
393 */
394 rtpi = get_unaligned_be16(ptr + 2);
395 /*
396 * Locate the matching relative target port identifier
397 * for the struct se_device storage object.
398 */
399 spin_lock(&dev->se_port_lock);
400 list_for_each_entry(lun, &dev->dev_sep_list,
401 lun_dev_link) {
402 if (lun->lun_tpg->tpg_rtpi != rtpi)
403 continue;
404
405 // XXX: racy unlock
406 spin_unlock(&dev->se_port_lock);
407
408 if (!core_alua_set_tg_pt_secondary_state(
409 lun, 1, 1))
410 found = true;
411
412 spin_lock(&dev->se_port_lock);
413 break;
414 }
415 spin_unlock(&dev->se_port_lock);
416 }
417
418 if (!found) {
419 rc = TCM_INVALID_PARAMETER_LIST;
420 goto out;
421 }
422
423 ptr += 4;
424 len += 4;
425 }
426
427 out:
428 transport_kunmap_data_sg(cmd);
429 if (!rc)
430 target_complete_cmd(cmd, SAM_STAT_GOOD);
431 return rc;
432 }
433
core_alua_state_nonoptimized(struct se_cmd * cmd,unsigned char * cdb,int nonop_delay_msecs)434 static inline void core_alua_state_nonoptimized(
435 struct se_cmd *cmd,
436 unsigned char *cdb,
437 int nonop_delay_msecs)
438 {
439 /*
440 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
441 * later to determine if processing of this cmd needs to be
442 * temporarily delayed for the Active/NonOptimized primary access state.
443 */
444 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
445 cmd->alua_nonop_delay = nonop_delay_msecs;
446 }
447
core_alua_state_lba_dependent(struct se_cmd * cmd,u16 tg_pt_gp_id)448 static inline sense_reason_t core_alua_state_lba_dependent(
449 struct se_cmd *cmd,
450 u16 tg_pt_gp_id)
451 {
452 struct se_device *dev = cmd->se_dev;
453 u64 segment_size, segment_mult, sectors, lba;
454
455 /* Only need to check for cdb actually containing LBAs */
456 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
457 return 0;
458
459 spin_lock(&dev->t10_alua.lba_map_lock);
460 segment_size = dev->t10_alua.lba_map_segment_size;
461 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
462 sectors = cmd->data_length / dev->dev_attrib.block_size;
463
464 lba = cmd->t_task_lba;
465 while (lba < cmd->t_task_lba + sectors) {
466 struct t10_alua_lba_map *cur_map = NULL, *map;
467 struct t10_alua_lba_map_member *map_mem;
468
469 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
470 lba_map_list) {
471 u64 start_lba, last_lba;
472 u64 first_lba = map->lba_map_first_lba;
473
474 if (segment_mult) {
475 u64 tmp = lba;
476 start_lba = do_div(tmp, segment_size * segment_mult);
477
478 last_lba = first_lba + segment_size - 1;
479 if (start_lba >= first_lba &&
480 start_lba <= last_lba) {
481 lba += segment_size;
482 cur_map = map;
483 break;
484 }
485 } else {
486 last_lba = map->lba_map_last_lba;
487 if (lba >= first_lba && lba <= last_lba) {
488 lba = last_lba + 1;
489 cur_map = map;
490 break;
491 }
492 }
493 }
494 if (!cur_map) {
495 spin_unlock(&dev->t10_alua.lba_map_lock);
496 return TCM_ALUA_TG_PT_UNAVAILABLE;
497 }
498 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
499 lba_map_mem_list) {
500 if (map_mem->lba_map_mem_alua_pg_id != tg_pt_gp_id)
501 continue;
502 switch(map_mem->lba_map_mem_alua_state) {
503 case ALUA_ACCESS_STATE_STANDBY:
504 spin_unlock(&dev->t10_alua.lba_map_lock);
505 return TCM_ALUA_TG_PT_STANDBY;
506 case ALUA_ACCESS_STATE_UNAVAILABLE:
507 spin_unlock(&dev->t10_alua.lba_map_lock);
508 return TCM_ALUA_TG_PT_UNAVAILABLE;
509 default:
510 break;
511 }
512 }
513 }
514 spin_unlock(&dev->t10_alua.lba_map_lock);
515 return 0;
516 }
517
core_alua_state_standby(struct se_cmd * cmd,unsigned char * cdb)518 static inline sense_reason_t core_alua_state_standby(
519 struct se_cmd *cmd,
520 unsigned char *cdb)
521 {
522 /*
523 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
524 * spc4r17 section 5.9.2.4.4
525 */
526 switch (cdb[0]) {
527 case INQUIRY:
528 case LOG_SELECT:
529 case LOG_SENSE:
530 case MODE_SELECT:
531 case MODE_SENSE:
532 case REPORT_LUNS:
533 case RECEIVE_DIAGNOSTIC:
534 case SEND_DIAGNOSTIC:
535 case READ_CAPACITY:
536 return 0;
537 case SERVICE_ACTION_IN_16:
538 switch (cdb[1] & 0x1f) {
539 case SAI_READ_CAPACITY_16:
540 return 0;
541 default:
542 return TCM_ALUA_TG_PT_STANDBY;
543 }
544 case MAINTENANCE_IN:
545 switch (cdb[1] & 0x1f) {
546 case MI_REPORT_TARGET_PGS:
547 return 0;
548 default:
549 return TCM_ALUA_TG_PT_STANDBY;
550 }
551 case MAINTENANCE_OUT:
552 switch (cdb[1]) {
553 case MO_SET_TARGET_PGS:
554 return 0;
555 default:
556 return TCM_ALUA_TG_PT_STANDBY;
557 }
558 case REQUEST_SENSE:
559 case PERSISTENT_RESERVE_IN:
560 case PERSISTENT_RESERVE_OUT:
561 case READ_BUFFER:
562 case WRITE_BUFFER:
563 return 0;
564 default:
565 return TCM_ALUA_TG_PT_STANDBY;
566 }
567
568 return 0;
569 }
570
core_alua_state_unavailable(struct se_cmd * cmd,unsigned char * cdb)571 static inline sense_reason_t core_alua_state_unavailable(
572 struct se_cmd *cmd,
573 unsigned char *cdb)
574 {
575 /*
576 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
577 * spc4r17 section 5.9.2.4.5
578 */
579 switch (cdb[0]) {
580 case INQUIRY:
581 case REPORT_LUNS:
582 return 0;
583 case MAINTENANCE_IN:
584 switch (cdb[1] & 0x1f) {
585 case MI_REPORT_TARGET_PGS:
586 return 0;
587 default:
588 return TCM_ALUA_TG_PT_UNAVAILABLE;
589 }
590 case MAINTENANCE_OUT:
591 switch (cdb[1]) {
592 case MO_SET_TARGET_PGS:
593 return 0;
594 default:
595 return TCM_ALUA_TG_PT_UNAVAILABLE;
596 }
597 case REQUEST_SENSE:
598 case READ_BUFFER:
599 case WRITE_BUFFER:
600 return 0;
601 default:
602 return TCM_ALUA_TG_PT_UNAVAILABLE;
603 }
604
605 return 0;
606 }
607
core_alua_state_transition(struct se_cmd * cmd,unsigned char * cdb)608 static inline sense_reason_t core_alua_state_transition(
609 struct se_cmd *cmd,
610 unsigned char *cdb)
611 {
612 /*
613 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
614 * spc4r17 section 5.9.2.5
615 */
616 switch (cdb[0]) {
617 case INQUIRY:
618 case REPORT_LUNS:
619 return 0;
620 case MAINTENANCE_IN:
621 switch (cdb[1] & 0x1f) {
622 case MI_REPORT_TARGET_PGS:
623 return 0;
624 default:
625 return TCM_ALUA_STATE_TRANSITION;
626 }
627 case REQUEST_SENSE:
628 case READ_BUFFER:
629 case WRITE_BUFFER:
630 return 0;
631 default:
632 return TCM_ALUA_STATE_TRANSITION;
633 }
634
635 return 0;
636 }
637
638 /*
639 * return 1: Is used to signal LUN not accessible, and check condition/not ready
640 * return 0: Used to signal success
641 * return -1: Used to signal failure, and invalid cdb field
642 */
643 sense_reason_t
target_alua_state_check(struct se_cmd * cmd)644 target_alua_state_check(struct se_cmd *cmd)
645 {
646 struct se_device *dev = cmd->se_dev;
647 unsigned char *cdb = cmd->t_task_cdb;
648 struct se_lun *lun = cmd->se_lun;
649 struct t10_alua_tg_pt_gp *tg_pt_gp;
650 int out_alua_state, nonop_delay_msecs;
651 u16 tg_pt_gp_id;
652 sense_reason_t rc = TCM_NO_SENSE;
653
654 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
655 return 0;
656 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
657 return 0;
658
659 /*
660 * First, check for a struct se_port specific secondary ALUA target port
661 * access state: OFFLINE
662 */
663 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
664 pr_debug("ALUA: Got secondary offline status for local"
665 " target port\n");
666 return TCM_ALUA_OFFLINE;
667 }
668 rcu_read_lock();
669 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
670 if (!tg_pt_gp) {
671 rcu_read_unlock();
672 return 0;
673 }
674
675 out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state;
676 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
677 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
678 rcu_read_unlock();
679 /*
680 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
681 * statement so the compiler knows explicitly to check this case first.
682 * For the Optimized ALUA access state case, we want to process the
683 * incoming fabric cmd ASAP..
684 */
685 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
686 return 0;
687
688 switch (out_alua_state) {
689 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
690 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
691 break;
692 case ALUA_ACCESS_STATE_STANDBY:
693 rc = core_alua_state_standby(cmd, cdb);
694 break;
695 case ALUA_ACCESS_STATE_UNAVAILABLE:
696 rc = core_alua_state_unavailable(cmd, cdb);
697 break;
698 case ALUA_ACCESS_STATE_TRANSITION:
699 rc = core_alua_state_transition(cmd, cdb);
700 break;
701 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
702 rc = core_alua_state_lba_dependent(cmd, tg_pt_gp_id);
703 break;
704 /*
705 * OFFLINE is a secondary ALUA target port group access state, that is
706 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
707 */
708 case ALUA_ACCESS_STATE_OFFLINE:
709 default:
710 pr_err("Unknown ALUA access state: 0x%02x\n",
711 out_alua_state);
712 rc = TCM_INVALID_CDB_FIELD;
713 }
714
715 if (rc && rc != TCM_INVALID_CDB_FIELD) {
716 pr_debug("[%s]: ALUA TG Port not available, "
717 "SenseKey: NOT_READY, ASC/rc: 0x04/%d\n",
718 cmd->se_tfo->fabric_name, rc);
719 }
720
721 return rc;
722 }
723
724 /*
725 * Check implicit and explicit ALUA state change request.
726 */
727 static sense_reason_t
core_alua_check_transition(int state,int valid,int * primary,int explicit)728 core_alua_check_transition(int state, int valid, int *primary, int explicit)
729 {
730 /*
731 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
732 * defined as primary target port asymmetric access states.
733 */
734 switch (state) {
735 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
736 if (!(valid & ALUA_AO_SUP))
737 goto not_supported;
738 *primary = 1;
739 break;
740 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
741 if (!(valid & ALUA_AN_SUP))
742 goto not_supported;
743 *primary = 1;
744 break;
745 case ALUA_ACCESS_STATE_STANDBY:
746 if (!(valid & ALUA_S_SUP))
747 goto not_supported;
748 *primary = 1;
749 break;
750 case ALUA_ACCESS_STATE_UNAVAILABLE:
751 if (!(valid & ALUA_U_SUP))
752 goto not_supported;
753 *primary = 1;
754 break;
755 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
756 if (!(valid & ALUA_LBD_SUP))
757 goto not_supported;
758 *primary = 1;
759 break;
760 case ALUA_ACCESS_STATE_OFFLINE:
761 /*
762 * OFFLINE state is defined as a secondary target port
763 * asymmetric access state.
764 */
765 if (!(valid & ALUA_O_SUP))
766 goto not_supported;
767 *primary = 0;
768 break;
769 case ALUA_ACCESS_STATE_TRANSITION:
770 if (!(valid & ALUA_T_SUP) || explicit)
771 /*
772 * Transitioning is set internally and by tcmu daemon,
773 * and cannot be selected through a STPG.
774 */
775 goto not_supported;
776 *primary = 0;
777 break;
778 default:
779 pr_err("Unknown ALUA access state: 0x%02x\n", state);
780 return TCM_INVALID_PARAMETER_LIST;
781 }
782
783 return 0;
784
785 not_supported:
786 pr_err("ALUA access state %s not supported",
787 core_alua_dump_state(state));
788 return TCM_INVALID_PARAMETER_LIST;
789 }
790
core_alua_dump_state(int state)791 static char *core_alua_dump_state(int state)
792 {
793 switch (state) {
794 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
795 return "Active/Optimized";
796 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
797 return "Active/NonOptimized";
798 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
799 return "LBA Dependent";
800 case ALUA_ACCESS_STATE_STANDBY:
801 return "Standby";
802 case ALUA_ACCESS_STATE_UNAVAILABLE:
803 return "Unavailable";
804 case ALUA_ACCESS_STATE_OFFLINE:
805 return "Offline";
806 case ALUA_ACCESS_STATE_TRANSITION:
807 return "Transitioning";
808 default:
809 return "Unknown";
810 }
811
812 return NULL;
813 }
814
core_alua_dump_status(int status)815 char *core_alua_dump_status(int status)
816 {
817 switch (status) {
818 case ALUA_STATUS_NONE:
819 return "None";
820 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
821 return "Altered by Explicit STPG";
822 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
823 return "Altered by Implicit ALUA";
824 default:
825 return "Unknown";
826 }
827
828 return NULL;
829 }
830
831 /*
832 * Used by fabric modules to determine when we need to delay processing
833 * for the Active/NonOptimized paths..
834 */
core_alua_check_nonop_delay(struct se_cmd * cmd)835 int core_alua_check_nonop_delay(
836 struct se_cmd *cmd)
837 {
838 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
839 return 0;
840 /*
841 * The ALUA Active/NonOptimized access state delay can be disabled
842 * in via configfs with a value of zero
843 */
844 if (!cmd->alua_nonop_delay)
845 return 0;
846 /*
847 * struct se_cmd->alua_nonop_delay gets set by a target port group
848 * defined interval in core_alua_state_nonoptimized()
849 */
850 msleep_interruptible(cmd->alua_nonop_delay);
851 return 0;
852 }
853 EXPORT_SYMBOL(core_alua_check_nonop_delay);
854
core_alua_write_tpg_metadata(const char * path,unsigned char * md_buf,u32 md_buf_len)855 static int core_alua_write_tpg_metadata(
856 const char *path,
857 unsigned char *md_buf,
858 u32 md_buf_len)
859 {
860 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
861 loff_t pos = 0;
862 int ret;
863
864 if (IS_ERR(file)) {
865 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
866 return -ENODEV;
867 }
868 ret = kernel_write(file, md_buf, md_buf_len, &pos);
869 if (ret < 0)
870 pr_err("Error writing ALUA metadata file: %s\n", path);
871 fput(file);
872 return (ret < 0) ? -EIO : 0;
873 }
874
core_alua_update_tpg_primary_metadata(struct t10_alua_tg_pt_gp * tg_pt_gp)875 static int core_alua_update_tpg_primary_metadata(
876 struct t10_alua_tg_pt_gp *tg_pt_gp)
877 {
878 unsigned char *md_buf;
879 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
880 char *path;
881 int len, rc;
882
883 lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex);
884
885 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
886 if (!md_buf) {
887 pr_err("Unable to allocate buf for ALUA metadata\n");
888 return -ENOMEM;
889 }
890
891 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
892 "tg_pt_gp_id=%hu\n"
893 "alua_access_state=0x%02x\n"
894 "alua_access_status=0x%02x\n",
895 tg_pt_gp->tg_pt_gp_id,
896 tg_pt_gp->tg_pt_gp_alua_access_state,
897 tg_pt_gp->tg_pt_gp_alua_access_status);
898
899 rc = -ENOMEM;
900 path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
901 &wwn->unit_serial[0],
902 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
903 if (path) {
904 rc = core_alua_write_tpg_metadata(path, md_buf, len);
905 kfree(path);
906 }
907 kfree(md_buf);
908 return rc;
909 }
910
core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp * tg_pt_gp)911 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
912 {
913 struct se_dev_entry *se_deve;
914 struct se_lun *lun;
915 struct se_lun_acl *lacl;
916
917 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
918 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
919 lun_tg_pt_gp_link) {
920 /*
921 * After an implicit target port asymmetric access state
922 * change, a device server shall establish a unit attention
923 * condition for the initiator port associated with every I_T
924 * nexus with the additional sense code set to ASYMMETRIC
925 * ACCESS STATE CHANGED.
926 *
927 * After an explicit target port asymmetric access state
928 * change, a device server shall establish a unit attention
929 * condition with the additional sense code set to ASYMMETRIC
930 * ACCESS STATE CHANGED for the initiator port associated with
931 * every I_T nexus other than the I_T nexus on which the SET
932 * TARGET PORT GROUPS command
933 */
934 if (!percpu_ref_tryget_live(&lun->lun_ref))
935 continue;
936 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
937
938 spin_lock(&lun->lun_deve_lock);
939 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
940 lacl = se_deve->se_lun_acl;
941
942 /*
943 * spc4r37 p.242:
944 * After an explicit target port asymmetric access
945 * state change, a device server shall establish a
946 * unit attention condition with the additional sense
947 * code set to ASYMMETRIC ACCESS STATE CHANGED for
948 * the initiator port associated with every I_T nexus
949 * other than the I_T nexus on which the SET TARGET
950 * PORT GROUPS command was received.
951 */
952 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
953 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
954 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
955 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
956 continue;
957
958 /*
959 * se_deve->se_lun_acl pointer may be NULL for a
960 * entry created without explicit Node+MappedLUN ACLs
961 */
962 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
963 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
964 continue;
965
966 core_scsi3_ua_allocate(se_deve, 0x2A,
967 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
968 }
969 spin_unlock(&lun->lun_deve_lock);
970
971 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
972 percpu_ref_put(&lun->lun_ref);
973 }
974 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
975 }
976
core_alua_do_transition_tg_pt(struct t10_alua_tg_pt_gp * tg_pt_gp,int new_state,int explicit)977 static int core_alua_do_transition_tg_pt(
978 struct t10_alua_tg_pt_gp *tg_pt_gp,
979 int new_state,
980 int explicit)
981 {
982 int prev_state;
983
984 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
985 /* Nothing to be done here */
986 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
987 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
988 return 0;
989 }
990
991 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
992 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
993 return -EAGAIN;
994 }
995
996 /*
997 * Save the old primary ALUA access state, and set the current state
998 * to ALUA_ACCESS_STATE_TRANSITION.
999 */
1000 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
1001 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
1002 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1003 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1004 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1005
1006 core_alua_queue_state_change_ua(tg_pt_gp);
1007
1008 if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
1009 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1010 return 0;
1011 }
1012
1013 /*
1014 * Check for the optional ALUA primary state transition delay
1015 */
1016 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1017 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1018
1019 /*
1020 * Set the current primary ALUA access state to the requested new state
1021 */
1022 tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
1023
1024 /*
1025 * Update the ALUA metadata buf that has been allocated in
1026 * core_alua_do_port_transition(), this metadata will be written
1027 * to struct file.
1028 *
1029 * Note that there is the case where we do not want to update the
1030 * metadata when the saved metadata is being parsed in userspace
1031 * when setting the existing port access state and access status.
1032 *
1033 * Also note that the failure to write out the ALUA metadata to
1034 * struct file does NOT affect the actual ALUA transition.
1035 */
1036 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1037 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1038 }
1039
1040 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1041 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1042 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1043 tg_pt_gp->tg_pt_gp_id,
1044 core_alua_dump_state(prev_state),
1045 core_alua_dump_state(new_state));
1046
1047 core_alua_queue_state_change_ua(tg_pt_gp);
1048
1049 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1050 return 0;
1051 }
1052
core_alua_do_port_transition(struct t10_alua_tg_pt_gp * l_tg_pt_gp,struct se_device * l_dev,struct se_lun * l_lun,struct se_node_acl * l_nacl,int new_state,int explicit)1053 int core_alua_do_port_transition(
1054 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1055 struct se_device *l_dev,
1056 struct se_lun *l_lun,
1057 struct se_node_acl *l_nacl,
1058 int new_state,
1059 int explicit)
1060 {
1061 struct se_device *dev;
1062 struct t10_alua_lu_gp *lu_gp;
1063 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1064 struct t10_alua_tg_pt_gp *tg_pt_gp;
1065 int primary, valid_states, rc = 0;
1066
1067 if (l_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
1068 return -ENODEV;
1069
1070 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1071 if (core_alua_check_transition(new_state, valid_states, &primary,
1072 explicit) != 0)
1073 return -EINVAL;
1074
1075 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1076 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1077 lu_gp = local_lu_gp_mem->lu_gp;
1078 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1079 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1080 /*
1081 * For storage objects that are members of the 'default_lu_gp',
1082 * we only do transition on the passed *l_tp_pt_gp, and not
1083 * on all of the matching target port groups IDs in default_lu_gp.
1084 */
1085 if (!lu_gp->lu_gp_id) {
1086 /*
1087 * core_alua_do_transition_tg_pt() will always return
1088 * success.
1089 */
1090 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1091 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1092 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1093 new_state, explicit);
1094 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1095 return rc;
1096 }
1097 /*
1098 * For all other LU groups aside from 'default_lu_gp', walk all of
1099 * the associated storage objects looking for a matching target port
1100 * group ID from the local target port group.
1101 */
1102 spin_lock(&lu_gp->lu_gp_lock);
1103 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1104 lu_gp_mem_list) {
1105
1106 dev = lu_gp_mem->lu_gp_mem_dev;
1107 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1108 spin_unlock(&lu_gp->lu_gp_lock);
1109
1110 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1111 list_for_each_entry(tg_pt_gp,
1112 &dev->t10_alua.tg_pt_gps_list,
1113 tg_pt_gp_list) {
1114
1115 if (!tg_pt_gp->tg_pt_gp_valid_id)
1116 continue;
1117 /*
1118 * If the target behavior port asymmetric access state
1119 * is changed for any target port group accessible via
1120 * a logical unit within a LU group, the target port
1121 * behavior group asymmetric access states for the same
1122 * target port group accessible via other logical units
1123 * in that LU group will also change.
1124 */
1125 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1126 continue;
1127
1128 if (l_tg_pt_gp == tg_pt_gp) {
1129 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1130 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1131 } else {
1132 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1133 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1134 }
1135 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1136 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1137 /*
1138 * core_alua_do_transition_tg_pt() will always return
1139 * success.
1140 */
1141 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1142 new_state, explicit);
1143
1144 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1145 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1146 if (rc)
1147 break;
1148 }
1149 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1150
1151 spin_lock(&lu_gp->lu_gp_lock);
1152 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1153 }
1154 spin_unlock(&lu_gp->lu_gp_lock);
1155
1156 if (!rc) {
1157 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1158 " Group IDs: %hu %s transition to primary state: %s\n",
1159 config_item_name(&lu_gp->lu_gp_group.cg_item),
1160 l_tg_pt_gp->tg_pt_gp_id,
1161 (explicit) ? "explicit" : "implicit",
1162 core_alua_dump_state(new_state));
1163 }
1164
1165 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1166 return rc;
1167 }
1168
core_alua_update_tpg_secondary_metadata(struct se_lun * lun)1169 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1170 {
1171 struct se_portal_group *se_tpg = lun->lun_tpg;
1172 unsigned char *md_buf;
1173 char *path;
1174 int len, rc;
1175
1176 mutex_lock(&lun->lun_tg_pt_md_mutex);
1177
1178 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1179 if (!md_buf) {
1180 pr_err("Unable to allocate buf for ALUA metadata\n");
1181 rc = -ENOMEM;
1182 goto out_unlock;
1183 }
1184
1185 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1186 "alua_tg_pt_status=0x%02x\n",
1187 atomic_read(&lun->lun_tg_pt_secondary_offline),
1188 lun->lun_tg_pt_secondary_stat);
1189
1190 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
1191 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
1192 db_root, se_tpg->se_tpg_tfo->fabric_name,
1193 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1194 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
1195 lun->unpacked_lun);
1196 } else {
1197 path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
1198 db_root, se_tpg->se_tpg_tfo->fabric_name,
1199 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
1200 lun->unpacked_lun);
1201 }
1202 if (!path) {
1203 rc = -ENOMEM;
1204 goto out_free;
1205 }
1206
1207 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1208 kfree(path);
1209 out_free:
1210 kfree(md_buf);
1211 out_unlock:
1212 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1213 return rc;
1214 }
1215
core_alua_set_tg_pt_secondary_state(struct se_lun * lun,int explicit,int offline)1216 static int core_alua_set_tg_pt_secondary_state(
1217 struct se_lun *lun,
1218 int explicit,
1219 int offline)
1220 {
1221 struct t10_alua_tg_pt_gp *tg_pt_gp;
1222 int trans_delay_msecs;
1223
1224 rcu_read_lock();
1225 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
1226 if (!tg_pt_gp) {
1227 rcu_read_unlock();
1228 pr_err("Unable to complete secondary state"
1229 " transition\n");
1230 return -EINVAL;
1231 }
1232 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1233 /*
1234 * Set the secondary ALUA target port access state to OFFLINE
1235 * or release the previously secondary state for struct se_lun
1236 */
1237 if (offline)
1238 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1239 else
1240 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1241
1242 lun->lun_tg_pt_secondary_stat = (explicit) ?
1243 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1244 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1245
1246 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1247 " to secondary access state: %s\n", (explicit) ? "explicit" :
1248 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1249 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1250
1251 rcu_read_unlock();
1252 /*
1253 * Do the optional transition delay after we set the secondary
1254 * ALUA access state.
1255 */
1256 if (trans_delay_msecs != 0)
1257 msleep_interruptible(trans_delay_msecs);
1258 /*
1259 * See if we need to update the ALUA fabric port metadata for
1260 * secondary state and status
1261 */
1262 if (lun->lun_tg_pt_secondary_write_md)
1263 core_alua_update_tpg_secondary_metadata(lun);
1264
1265 return 0;
1266 }
1267
1268 struct t10_alua_lba_map *
core_alua_allocate_lba_map(struct list_head * list,u64 first_lba,u64 last_lba)1269 core_alua_allocate_lba_map(struct list_head *list,
1270 u64 first_lba, u64 last_lba)
1271 {
1272 struct t10_alua_lba_map *lba_map;
1273
1274 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1275 if (!lba_map) {
1276 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1277 return ERR_PTR(-ENOMEM);
1278 }
1279 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1280 lba_map->lba_map_first_lba = first_lba;
1281 lba_map->lba_map_last_lba = last_lba;
1282
1283 list_add_tail(&lba_map->lba_map_list, list);
1284 return lba_map;
1285 }
1286
1287 int
core_alua_allocate_lba_map_mem(struct t10_alua_lba_map * lba_map,int pg_id,int state)1288 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1289 int pg_id, int state)
1290 {
1291 struct t10_alua_lba_map_member *lba_map_mem;
1292
1293 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1294 lba_map_mem_list) {
1295 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1296 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1297 return -EINVAL;
1298 }
1299 }
1300
1301 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1302 if (!lba_map_mem) {
1303 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1304 return -ENOMEM;
1305 }
1306 lba_map_mem->lba_map_mem_alua_state = state;
1307 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1308
1309 list_add_tail(&lba_map_mem->lba_map_mem_list,
1310 &lba_map->lba_map_mem_list);
1311 return 0;
1312 }
1313
1314 void
core_alua_free_lba_map(struct list_head * lba_list)1315 core_alua_free_lba_map(struct list_head *lba_list)
1316 {
1317 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1318 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1319
1320 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1321 lba_map_list) {
1322 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1323 &lba_map->lba_map_mem_list,
1324 lba_map_mem_list) {
1325 list_del(&lba_map_mem->lba_map_mem_list);
1326 kmem_cache_free(t10_alua_lba_map_mem_cache,
1327 lba_map_mem);
1328 }
1329 list_del(&lba_map->lba_map_list);
1330 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1331 }
1332 }
1333
1334 void
core_alua_set_lba_map(struct se_device * dev,struct list_head * lba_map_list,int segment_size,int segment_mult)1335 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1336 int segment_size, int segment_mult)
1337 {
1338 struct list_head old_lba_map_list;
1339 struct t10_alua_tg_pt_gp *tg_pt_gp;
1340 int activate = 0, supported;
1341
1342 INIT_LIST_HEAD(&old_lba_map_list);
1343 spin_lock(&dev->t10_alua.lba_map_lock);
1344 dev->t10_alua.lba_map_segment_size = segment_size;
1345 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1346 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1347 if (lba_map_list) {
1348 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1349 activate = 1;
1350 }
1351 spin_unlock(&dev->t10_alua.lba_map_lock);
1352 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1353 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1354 tg_pt_gp_list) {
1355
1356 if (!tg_pt_gp->tg_pt_gp_valid_id)
1357 continue;
1358 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1359 if (activate)
1360 supported |= ALUA_LBD_SUP;
1361 else
1362 supported &= ~ALUA_LBD_SUP;
1363 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1364 }
1365 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1366 core_alua_free_lba_map(&old_lba_map_list);
1367 }
1368
1369 struct t10_alua_lu_gp *
core_alua_allocate_lu_gp(const char * name,int def_group)1370 core_alua_allocate_lu_gp(const char *name, int def_group)
1371 {
1372 struct t10_alua_lu_gp *lu_gp;
1373
1374 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1375 if (!lu_gp) {
1376 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1377 return ERR_PTR(-ENOMEM);
1378 }
1379 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1380 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1381 spin_lock_init(&lu_gp->lu_gp_lock);
1382 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1383
1384 if (def_group) {
1385 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1386 lu_gp->lu_gp_valid_id = 1;
1387 alua_lu_gps_count++;
1388 }
1389
1390 return lu_gp;
1391 }
1392
core_alua_set_lu_gp_id(struct t10_alua_lu_gp * lu_gp,u16 lu_gp_id)1393 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1394 {
1395 struct t10_alua_lu_gp *lu_gp_tmp;
1396 u16 lu_gp_id_tmp;
1397 /*
1398 * The lu_gp->lu_gp_id may only be set once..
1399 */
1400 if (lu_gp->lu_gp_valid_id) {
1401 pr_warn("ALUA LU Group already has a valid ID,"
1402 " ignoring request\n");
1403 return -EINVAL;
1404 }
1405
1406 spin_lock(&lu_gps_lock);
1407 if (alua_lu_gps_count == 0x0000ffff) {
1408 pr_err("Maximum ALUA alua_lu_gps_count:"
1409 " 0x0000ffff reached\n");
1410 spin_unlock(&lu_gps_lock);
1411 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1412 return -ENOSPC;
1413 }
1414 again:
1415 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1416 alua_lu_gps_counter++;
1417
1418 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1419 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1420 if (!lu_gp_id)
1421 goto again;
1422
1423 pr_warn("ALUA Logical Unit Group ID: %hu"
1424 " already exists, ignoring request\n",
1425 lu_gp_id);
1426 spin_unlock(&lu_gps_lock);
1427 return -EINVAL;
1428 }
1429 }
1430
1431 lu_gp->lu_gp_id = lu_gp_id_tmp;
1432 lu_gp->lu_gp_valid_id = 1;
1433 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1434 alua_lu_gps_count++;
1435 spin_unlock(&lu_gps_lock);
1436
1437 return 0;
1438 }
1439
1440 static struct t10_alua_lu_gp_member *
core_alua_allocate_lu_gp_mem(struct se_device * dev)1441 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1442 {
1443 struct t10_alua_lu_gp_member *lu_gp_mem;
1444
1445 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1446 if (!lu_gp_mem) {
1447 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1448 return ERR_PTR(-ENOMEM);
1449 }
1450 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1451 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1452 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1453
1454 lu_gp_mem->lu_gp_mem_dev = dev;
1455 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1456
1457 return lu_gp_mem;
1458 }
1459
core_alua_free_lu_gp(struct t10_alua_lu_gp * lu_gp)1460 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1461 {
1462 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1463 /*
1464 * Once we have reached this point, config_item_put() has
1465 * already been called from target_core_alua_drop_lu_gp().
1466 *
1467 * Here, we remove the *lu_gp from the global list so that
1468 * no associations can be made while we are releasing
1469 * struct t10_alua_lu_gp.
1470 */
1471 spin_lock(&lu_gps_lock);
1472 list_del(&lu_gp->lu_gp_node);
1473 alua_lu_gps_count--;
1474 spin_unlock(&lu_gps_lock);
1475 /*
1476 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1477 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1478 * released with core_alua_put_lu_gp_from_name()
1479 */
1480 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1481 cpu_relax();
1482 /*
1483 * Release reference to struct t10_alua_lu_gp * from all associated
1484 * struct se_device.
1485 */
1486 spin_lock(&lu_gp->lu_gp_lock);
1487 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1488 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1489 if (lu_gp_mem->lu_gp_assoc) {
1490 list_del(&lu_gp_mem->lu_gp_mem_list);
1491 lu_gp->lu_gp_members--;
1492 lu_gp_mem->lu_gp_assoc = 0;
1493 }
1494 spin_unlock(&lu_gp->lu_gp_lock);
1495 /*
1496 *
1497 * lu_gp_mem is associated with a single
1498 * struct se_device->dev_alua_lu_gp_mem, and is released when
1499 * struct se_device is released via core_alua_free_lu_gp_mem().
1500 *
1501 * If the passed lu_gp does NOT match the default_lu_gp, assume
1502 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1503 */
1504 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1505 if (lu_gp != default_lu_gp)
1506 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1507 default_lu_gp);
1508 else
1509 lu_gp_mem->lu_gp = NULL;
1510 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1511
1512 spin_lock(&lu_gp->lu_gp_lock);
1513 }
1514 spin_unlock(&lu_gp->lu_gp_lock);
1515
1516 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1517 }
1518
core_alua_free_lu_gp_mem(struct se_device * dev)1519 void core_alua_free_lu_gp_mem(struct se_device *dev)
1520 {
1521 struct t10_alua_lu_gp *lu_gp;
1522 struct t10_alua_lu_gp_member *lu_gp_mem;
1523
1524 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1525 if (!lu_gp_mem)
1526 return;
1527
1528 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1529 cpu_relax();
1530
1531 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1532 lu_gp = lu_gp_mem->lu_gp;
1533 if (lu_gp) {
1534 spin_lock(&lu_gp->lu_gp_lock);
1535 if (lu_gp_mem->lu_gp_assoc) {
1536 list_del(&lu_gp_mem->lu_gp_mem_list);
1537 lu_gp->lu_gp_members--;
1538 lu_gp_mem->lu_gp_assoc = 0;
1539 }
1540 spin_unlock(&lu_gp->lu_gp_lock);
1541 lu_gp_mem->lu_gp = NULL;
1542 }
1543 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1544
1545 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1546 }
1547
core_alua_get_lu_gp_by_name(const char * name)1548 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1549 {
1550 struct t10_alua_lu_gp *lu_gp;
1551 struct config_item *ci;
1552
1553 spin_lock(&lu_gps_lock);
1554 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1555 if (!lu_gp->lu_gp_valid_id)
1556 continue;
1557 ci = &lu_gp->lu_gp_group.cg_item;
1558 if (!strcmp(config_item_name(ci), name)) {
1559 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1560 spin_unlock(&lu_gps_lock);
1561 return lu_gp;
1562 }
1563 }
1564 spin_unlock(&lu_gps_lock);
1565
1566 return NULL;
1567 }
1568
core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp * lu_gp)1569 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1570 {
1571 spin_lock(&lu_gps_lock);
1572 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1573 spin_unlock(&lu_gps_lock);
1574 }
1575
1576 /*
1577 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1578 */
__core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1579 void __core_alua_attach_lu_gp_mem(
1580 struct t10_alua_lu_gp_member *lu_gp_mem,
1581 struct t10_alua_lu_gp *lu_gp)
1582 {
1583 spin_lock(&lu_gp->lu_gp_lock);
1584 lu_gp_mem->lu_gp = lu_gp;
1585 lu_gp_mem->lu_gp_assoc = 1;
1586 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1587 lu_gp->lu_gp_members++;
1588 spin_unlock(&lu_gp->lu_gp_lock);
1589 }
1590
1591 /*
1592 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1593 */
__core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member * lu_gp_mem,struct t10_alua_lu_gp * lu_gp)1594 void __core_alua_drop_lu_gp_mem(
1595 struct t10_alua_lu_gp_member *lu_gp_mem,
1596 struct t10_alua_lu_gp *lu_gp)
1597 {
1598 spin_lock(&lu_gp->lu_gp_lock);
1599 list_del(&lu_gp_mem->lu_gp_mem_list);
1600 lu_gp_mem->lu_gp = NULL;
1601 lu_gp_mem->lu_gp_assoc = 0;
1602 lu_gp->lu_gp_members--;
1603 spin_unlock(&lu_gp->lu_gp_lock);
1604 }
1605
core_alua_allocate_tg_pt_gp(struct se_device * dev,const char * name,int def_group)1606 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1607 const char *name, int def_group)
1608 {
1609 struct t10_alua_tg_pt_gp *tg_pt_gp;
1610
1611 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1612 if (!tg_pt_gp) {
1613 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1614 return NULL;
1615 }
1616 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1617 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1618 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
1619 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1620 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1621 tg_pt_gp->tg_pt_gp_dev = dev;
1622 tg_pt_gp->tg_pt_gp_alua_access_state =
1623 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
1624 /*
1625 * Enable both explicit and implicit ALUA support by default
1626 */
1627 tg_pt_gp->tg_pt_gp_alua_access_type =
1628 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1629 /*
1630 * Set the default Active/NonOptimized Delay in milliseconds
1631 */
1632 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1633 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1634 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1635
1636 /*
1637 * Enable all supported states
1638 */
1639 tg_pt_gp->tg_pt_gp_alua_supported_states =
1640 ALUA_T_SUP | ALUA_O_SUP |
1641 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1642
1643 if (def_group) {
1644 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1645 tg_pt_gp->tg_pt_gp_id =
1646 dev->t10_alua.alua_tg_pt_gps_counter++;
1647 tg_pt_gp->tg_pt_gp_valid_id = 1;
1648 dev->t10_alua.alua_tg_pt_gps_count++;
1649 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1650 &dev->t10_alua.tg_pt_gps_list);
1651 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1652 }
1653
1654 return tg_pt_gp;
1655 }
1656
core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp * tg_pt_gp,u16 tg_pt_gp_id)1657 int core_alua_set_tg_pt_gp_id(
1658 struct t10_alua_tg_pt_gp *tg_pt_gp,
1659 u16 tg_pt_gp_id)
1660 {
1661 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1662 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1663 u16 tg_pt_gp_id_tmp;
1664
1665 /*
1666 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1667 */
1668 if (tg_pt_gp->tg_pt_gp_valid_id) {
1669 pr_warn("ALUA TG PT Group already has a valid ID,"
1670 " ignoring request\n");
1671 return -EINVAL;
1672 }
1673
1674 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1675 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1676 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1677 " 0x0000ffff reached\n");
1678 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1679 return -ENOSPC;
1680 }
1681 again:
1682 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1683 dev->t10_alua.alua_tg_pt_gps_counter++;
1684
1685 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1686 tg_pt_gp_list) {
1687 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1688 if (!tg_pt_gp_id)
1689 goto again;
1690
1691 pr_err("ALUA Target Port Group ID: %hu already"
1692 " exists, ignoring request\n", tg_pt_gp_id);
1693 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1694 return -EINVAL;
1695 }
1696 }
1697
1698 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1699 tg_pt_gp->tg_pt_gp_valid_id = 1;
1700 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1701 &dev->t10_alua.tg_pt_gps_list);
1702 dev->t10_alua.alua_tg_pt_gps_count++;
1703 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1704
1705 return 0;
1706 }
1707
core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp * tg_pt_gp)1708 void core_alua_free_tg_pt_gp(
1709 struct t10_alua_tg_pt_gp *tg_pt_gp)
1710 {
1711 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1712 struct se_lun *lun, *next;
1713
1714 /*
1715 * Once we have reached this point, config_item_put() has already
1716 * been called from target_core_alua_drop_tg_pt_gp().
1717 *
1718 * Here we remove *tg_pt_gp from the global list so that
1719 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1720 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1721 */
1722 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1723 if (tg_pt_gp->tg_pt_gp_valid_id) {
1724 list_del(&tg_pt_gp->tg_pt_gp_list);
1725 dev->t10_alua.alua_tg_pt_gps_count--;
1726 }
1727 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1728
1729 /*
1730 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1731 * core_alua_get_tg_pt_gp_by_name() in
1732 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1733 * to be released with core_alua_put_tg_pt_gp_from_name().
1734 */
1735 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1736 cpu_relax();
1737
1738 /*
1739 * Release reference to struct t10_alua_tg_pt_gp from all associated
1740 * struct se_port.
1741 */
1742 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1743 list_for_each_entry_safe(lun, next,
1744 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1745 list_del_init(&lun->lun_tg_pt_gp_link);
1746 tg_pt_gp->tg_pt_gp_members--;
1747
1748 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1749 /*
1750 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1751 * assume we want to re-associate a given tg_pt_gp_mem with
1752 * default_tg_pt_gp.
1753 */
1754 spin_lock(&lun->lun_tg_pt_gp_lock);
1755 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1756 __target_attach_tg_pt_gp(lun,
1757 dev->t10_alua.default_tg_pt_gp);
1758 } else
1759 rcu_assign_pointer(lun->lun_tg_pt_gp, NULL);
1760 spin_unlock(&lun->lun_tg_pt_gp_lock);
1761
1762 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1763 }
1764 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1765
1766 synchronize_rcu();
1767 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1768 }
1769
core_alua_get_tg_pt_gp_by_name(struct se_device * dev,const char * name)1770 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1771 struct se_device *dev, const char *name)
1772 {
1773 struct t10_alua_tg_pt_gp *tg_pt_gp;
1774 struct config_item *ci;
1775
1776 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1777 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1778 tg_pt_gp_list) {
1779 if (!tg_pt_gp->tg_pt_gp_valid_id)
1780 continue;
1781 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1782 if (!strcmp(config_item_name(ci), name)) {
1783 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1784 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1785 return tg_pt_gp;
1786 }
1787 }
1788 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1789
1790 return NULL;
1791 }
1792
core_alua_put_tg_pt_gp_from_name(struct t10_alua_tg_pt_gp * tg_pt_gp)1793 static void core_alua_put_tg_pt_gp_from_name(
1794 struct t10_alua_tg_pt_gp *tg_pt_gp)
1795 {
1796 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1797
1798 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1799 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1800 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1801 }
1802
__target_attach_tg_pt_gp(struct se_lun * lun,struct t10_alua_tg_pt_gp * tg_pt_gp)1803 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1804 struct t10_alua_tg_pt_gp *tg_pt_gp)
1805 {
1806 struct se_dev_entry *se_deve;
1807
1808 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1809
1810 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1811 rcu_assign_pointer(lun->lun_tg_pt_gp, tg_pt_gp);
1812 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1813 tg_pt_gp->tg_pt_gp_members++;
1814 spin_lock(&lun->lun_deve_lock);
1815 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1816 core_scsi3_ua_allocate(se_deve, 0x3f,
1817 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1818 spin_unlock(&lun->lun_deve_lock);
1819 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1820 }
1821
target_attach_tg_pt_gp(struct se_lun * lun,struct t10_alua_tg_pt_gp * tg_pt_gp)1822 void target_attach_tg_pt_gp(struct se_lun *lun,
1823 struct t10_alua_tg_pt_gp *tg_pt_gp)
1824 {
1825 spin_lock(&lun->lun_tg_pt_gp_lock);
1826 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1827 spin_unlock(&lun->lun_tg_pt_gp_lock);
1828 synchronize_rcu();
1829 }
1830
__target_detach_tg_pt_gp(struct se_lun * lun,struct t10_alua_tg_pt_gp * tg_pt_gp)1831 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1832 struct t10_alua_tg_pt_gp *tg_pt_gp)
1833 {
1834 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1835
1836 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1837 list_del_init(&lun->lun_tg_pt_gp_link);
1838 tg_pt_gp->tg_pt_gp_members--;
1839 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1840 }
1841
target_detach_tg_pt_gp(struct se_lun * lun)1842 void target_detach_tg_pt_gp(struct se_lun *lun)
1843 {
1844 struct t10_alua_tg_pt_gp *tg_pt_gp;
1845
1846 spin_lock(&lun->lun_tg_pt_gp_lock);
1847 tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp,
1848 lockdep_is_held(&lun->lun_tg_pt_gp_lock));
1849 if (tg_pt_gp) {
1850 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1851 rcu_assign_pointer(lun->lun_tg_pt_gp, NULL);
1852 }
1853 spin_unlock(&lun->lun_tg_pt_gp_lock);
1854 synchronize_rcu();
1855 }
1856
target_swap_tg_pt_gp(struct se_lun * lun,struct t10_alua_tg_pt_gp * old_tg_pt_gp,struct t10_alua_tg_pt_gp * new_tg_pt_gp)1857 static void target_swap_tg_pt_gp(struct se_lun *lun,
1858 struct t10_alua_tg_pt_gp *old_tg_pt_gp,
1859 struct t10_alua_tg_pt_gp *new_tg_pt_gp)
1860 {
1861 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1862
1863 if (old_tg_pt_gp)
1864 __target_detach_tg_pt_gp(lun, old_tg_pt_gp);
1865 __target_attach_tg_pt_gp(lun, new_tg_pt_gp);
1866 }
1867
core_alua_show_tg_pt_gp_info(struct se_lun * lun,char * page)1868 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1869 {
1870 struct config_item *tg_pt_ci;
1871 struct t10_alua_tg_pt_gp *tg_pt_gp;
1872 ssize_t len = 0;
1873
1874 rcu_read_lock();
1875 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
1876 if (tg_pt_gp) {
1877 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1878 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1879 " %hu\nTG Port Primary Access State: %s\nTG Port "
1880 "Primary Access Status: %s\nTG Port Secondary Access"
1881 " State: %s\nTG Port Secondary Access Status: %s\n",
1882 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1883 core_alua_dump_state(
1884 tg_pt_gp->tg_pt_gp_alua_access_state),
1885 core_alua_dump_status(
1886 tg_pt_gp->tg_pt_gp_alua_access_status),
1887 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1888 "Offline" : "None",
1889 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1890 }
1891 rcu_read_unlock();
1892
1893 return len;
1894 }
1895
core_alua_store_tg_pt_gp_info(struct se_lun * lun,const char * page,size_t count)1896 ssize_t core_alua_store_tg_pt_gp_info(
1897 struct se_lun *lun,
1898 const char *page,
1899 size_t count)
1900 {
1901 struct se_portal_group *tpg = lun->lun_tpg;
1902 /*
1903 * rcu_dereference_raw protected by se_lun->lun_group symlink
1904 * reference to se_device->dev_group.
1905 */
1906 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1907 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1908 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1909 int move = 0;
1910
1911 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
1912 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1913 return -ENODEV;
1914
1915 if (count > TG_PT_GROUP_NAME_BUF) {
1916 pr_err("ALUA Target Port Group alias too large!\n");
1917 return -EINVAL;
1918 }
1919 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1920 memcpy(buf, page, count);
1921 /*
1922 * Any ALUA target port group alias besides "NULL" means we will be
1923 * making a new group association.
1924 */
1925 if (strcmp(strstrip(buf), "NULL")) {
1926 /*
1927 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1928 * struct t10_alua_tg_pt_gp. This reference is released with
1929 * core_alua_put_tg_pt_gp_from_name() below.
1930 */
1931 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1932 strstrip(buf));
1933 if (!tg_pt_gp_new)
1934 return -ENODEV;
1935 }
1936
1937 spin_lock(&lun->lun_tg_pt_gp_lock);
1938 tg_pt_gp = rcu_dereference_check(lun->lun_tg_pt_gp,
1939 lockdep_is_held(&lun->lun_tg_pt_gp_lock));
1940 if (tg_pt_gp) {
1941 /*
1942 * Clearing an existing tg_pt_gp association, and replacing
1943 * with the default_tg_pt_gp.
1944 */
1945 if (!tg_pt_gp_new) {
1946 pr_debug("Target_Core_ConfigFS: Moving"
1947 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1948 " alua/%s, ID: %hu back to"
1949 " default_tg_pt_gp\n",
1950 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1951 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1952 config_item_name(&lun->lun_group.cg_item),
1953 config_item_name(
1954 &tg_pt_gp->tg_pt_gp_group.cg_item),
1955 tg_pt_gp->tg_pt_gp_id);
1956
1957 target_swap_tg_pt_gp(lun, tg_pt_gp,
1958 dev->t10_alua.default_tg_pt_gp);
1959 spin_unlock(&lun->lun_tg_pt_gp_lock);
1960
1961 goto sync_rcu;
1962 }
1963 move = 1;
1964 }
1965
1966 target_swap_tg_pt_gp(lun, tg_pt_gp, tg_pt_gp_new);
1967 spin_unlock(&lun->lun_tg_pt_gp_lock);
1968 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1969 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1970 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1971 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1972 config_item_name(&lun->lun_group.cg_item),
1973 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1974 tg_pt_gp_new->tg_pt_gp_id);
1975
1976 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1977 sync_rcu:
1978 synchronize_rcu();
1979 return count;
1980 }
1981
core_alua_show_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)1982 ssize_t core_alua_show_access_type(
1983 struct t10_alua_tg_pt_gp *tg_pt_gp,
1984 char *page)
1985 {
1986 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
1987 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
1988 return sprintf(page, "Implicit and Explicit\n");
1989 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
1990 return sprintf(page, "Implicit\n");
1991 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
1992 return sprintf(page, "Explicit\n");
1993 else
1994 return sprintf(page, "None\n");
1995 }
1996
core_alua_store_access_type(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)1997 ssize_t core_alua_store_access_type(
1998 struct t10_alua_tg_pt_gp *tg_pt_gp,
1999 const char *page,
2000 size_t count)
2001 {
2002 unsigned long tmp;
2003 int ret;
2004
2005 ret = kstrtoul(page, 0, &tmp);
2006 if (ret < 0) {
2007 pr_err("Unable to extract alua_access_type\n");
2008 return ret;
2009 }
2010 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2011 pr_err("Illegal value for alua_access_type:"
2012 " %lu\n", tmp);
2013 return -EINVAL;
2014 }
2015 if (tmp == 3)
2016 tg_pt_gp->tg_pt_gp_alua_access_type =
2017 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2018 else if (tmp == 2)
2019 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2020 else if (tmp == 1)
2021 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2022 else
2023 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2024
2025 return count;
2026 }
2027
core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2028 ssize_t core_alua_show_nonop_delay_msecs(
2029 struct t10_alua_tg_pt_gp *tg_pt_gp,
2030 char *page)
2031 {
2032 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2033 }
2034
core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2035 ssize_t core_alua_store_nonop_delay_msecs(
2036 struct t10_alua_tg_pt_gp *tg_pt_gp,
2037 const char *page,
2038 size_t count)
2039 {
2040 unsigned long tmp;
2041 int ret;
2042
2043 ret = kstrtoul(page, 0, &tmp);
2044 if (ret < 0) {
2045 pr_err("Unable to extract nonop_delay_msecs\n");
2046 return ret;
2047 }
2048 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2049 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2050 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2051 ALUA_MAX_NONOP_DELAY_MSECS);
2052 return -EINVAL;
2053 }
2054 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2055
2056 return count;
2057 }
2058
core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2059 ssize_t core_alua_show_trans_delay_msecs(
2060 struct t10_alua_tg_pt_gp *tg_pt_gp,
2061 char *page)
2062 {
2063 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2064 }
2065
core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2066 ssize_t core_alua_store_trans_delay_msecs(
2067 struct t10_alua_tg_pt_gp *tg_pt_gp,
2068 const char *page,
2069 size_t count)
2070 {
2071 unsigned long tmp;
2072 int ret;
2073
2074 ret = kstrtoul(page, 0, &tmp);
2075 if (ret < 0) {
2076 pr_err("Unable to extract trans_delay_msecs\n");
2077 return ret;
2078 }
2079 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2080 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2081 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2082 ALUA_MAX_TRANS_DELAY_MSECS);
2083 return -EINVAL;
2084 }
2085 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2086
2087 return count;
2088 }
2089
core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2090 ssize_t core_alua_show_implicit_trans_secs(
2091 struct t10_alua_tg_pt_gp *tg_pt_gp,
2092 char *page)
2093 {
2094 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2095 }
2096
core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2097 ssize_t core_alua_store_implicit_trans_secs(
2098 struct t10_alua_tg_pt_gp *tg_pt_gp,
2099 const char *page,
2100 size_t count)
2101 {
2102 unsigned long tmp;
2103 int ret;
2104
2105 ret = kstrtoul(page, 0, &tmp);
2106 if (ret < 0) {
2107 pr_err("Unable to extract implicit_trans_secs\n");
2108 return ret;
2109 }
2110 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2111 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2112 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2113 ALUA_MAX_IMPLICIT_TRANS_SECS);
2114 return -EINVAL;
2115 }
2116 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2117
2118 return count;
2119 }
2120
core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,char * page)2121 ssize_t core_alua_show_preferred_bit(
2122 struct t10_alua_tg_pt_gp *tg_pt_gp,
2123 char *page)
2124 {
2125 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2126 }
2127
core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp * tg_pt_gp,const char * page,size_t count)2128 ssize_t core_alua_store_preferred_bit(
2129 struct t10_alua_tg_pt_gp *tg_pt_gp,
2130 const char *page,
2131 size_t count)
2132 {
2133 unsigned long tmp;
2134 int ret;
2135
2136 ret = kstrtoul(page, 0, &tmp);
2137 if (ret < 0) {
2138 pr_err("Unable to extract preferred ALUA value\n");
2139 return ret;
2140 }
2141 if ((tmp != 0) && (tmp != 1)) {
2142 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2143 return -EINVAL;
2144 }
2145 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2146
2147 return count;
2148 }
2149
core_alua_show_offline_bit(struct se_lun * lun,char * page)2150 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2151 {
2152 return sprintf(page, "%d\n",
2153 atomic_read(&lun->lun_tg_pt_secondary_offline));
2154 }
2155
core_alua_store_offline_bit(struct se_lun * lun,const char * page,size_t count)2156 ssize_t core_alua_store_offline_bit(
2157 struct se_lun *lun,
2158 const char *page,
2159 size_t count)
2160 {
2161 /*
2162 * rcu_dereference_raw protected by se_lun->lun_group symlink
2163 * reference to se_device->dev_group.
2164 */
2165 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2166 unsigned long tmp;
2167 int ret;
2168
2169 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
2170 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2171 return -ENODEV;
2172
2173 ret = kstrtoul(page, 0, &tmp);
2174 if (ret < 0) {
2175 pr_err("Unable to extract alua_tg_pt_offline value\n");
2176 return ret;
2177 }
2178 if ((tmp != 0) && (tmp != 1)) {
2179 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2180 tmp);
2181 return -EINVAL;
2182 }
2183
2184 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2185 if (ret < 0)
2186 return -EINVAL;
2187
2188 return count;
2189 }
2190
core_alua_show_secondary_status(struct se_lun * lun,char * page)2191 ssize_t core_alua_show_secondary_status(
2192 struct se_lun *lun,
2193 char *page)
2194 {
2195 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2196 }
2197
core_alua_store_secondary_status(struct se_lun * lun,const char * page,size_t count)2198 ssize_t core_alua_store_secondary_status(
2199 struct se_lun *lun,
2200 const char *page,
2201 size_t count)
2202 {
2203 unsigned long tmp;
2204 int ret;
2205
2206 ret = kstrtoul(page, 0, &tmp);
2207 if (ret < 0) {
2208 pr_err("Unable to extract alua_tg_pt_status\n");
2209 return ret;
2210 }
2211 if ((tmp != ALUA_STATUS_NONE) &&
2212 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2213 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2214 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2215 tmp);
2216 return -EINVAL;
2217 }
2218 lun->lun_tg_pt_secondary_stat = (int)tmp;
2219
2220 return count;
2221 }
2222
core_alua_show_secondary_write_metadata(struct se_lun * lun,char * page)2223 ssize_t core_alua_show_secondary_write_metadata(
2224 struct se_lun *lun,
2225 char *page)
2226 {
2227 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2228 }
2229
core_alua_store_secondary_write_metadata(struct se_lun * lun,const char * page,size_t count)2230 ssize_t core_alua_store_secondary_write_metadata(
2231 struct se_lun *lun,
2232 const char *page,
2233 size_t count)
2234 {
2235 unsigned long tmp;
2236 int ret;
2237
2238 ret = kstrtoul(page, 0, &tmp);
2239 if (ret < 0) {
2240 pr_err("Unable to extract alua_tg_pt_write_md\n");
2241 return ret;
2242 }
2243 if ((tmp != 0) && (tmp != 1)) {
2244 pr_err("Illegal value for alua_tg_pt_write_md:"
2245 " %lu\n", tmp);
2246 return -EINVAL;
2247 }
2248 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2249
2250 return count;
2251 }
2252
core_setup_alua(struct se_device * dev)2253 int core_setup_alua(struct se_device *dev)
2254 {
2255 if (!(dev->transport_flags &
2256 TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
2257 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2258 struct t10_alua_lu_gp_member *lu_gp_mem;
2259
2260 /*
2261 * Associate this struct se_device with the default ALUA
2262 * LUN Group.
2263 */
2264 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2265 if (IS_ERR(lu_gp_mem))
2266 return PTR_ERR(lu_gp_mem);
2267
2268 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2269 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2270 default_lu_gp);
2271 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2272
2273 pr_debug("%s: Adding to default ALUA LU Group:"
2274 " core/alua/lu_gps/default_lu_gp\n",
2275 dev->transport->name);
2276 }
2277
2278 return 0;
2279 }
2280