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Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorri...
[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[ALUA_METADATA_PATH_LEN];
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 memset(path, 0, ALUA_METADATA_PATH_LEN);
931
932 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
933 "tg_pt_gp_id=%hu\n"
934 "alua_access_state=0x%02x\n"
935 "alua_access_status=0x%02x\n",
936 tg_pt_gp->tg_pt_gp_id,
937 tg_pt_gp->tg_pt_gp_alua_access_state,
938 tg_pt_gp->tg_pt_gp_alua_access_status);
939
940 snprintf(path, ALUA_METADATA_PATH_LEN,
941 "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0],
942 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
943
944 rc = core_alua_write_tpg_metadata(path, md_buf, len);
945 kfree(md_buf);
946 return rc;
947 }
948
949 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
950 {
951 struct se_dev_entry *se_deve;
952 struct se_lun *lun;
953 struct se_lun_acl *lacl;
954
955 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
956 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
957 lun_tg_pt_gp_link) {
958 /*
959 * After an implicit target port asymmetric access state
960 * change, a device server shall establish a unit attention
961 * condition for the initiator port associated with every I_T
962 * nexus with the additional sense code set to ASYMMETRIC
963 * ACCESS STATE CHANGED.
964 *
965 * After an explicit target port asymmetric access state
966 * change, a device server shall establish a unit attention
967 * condition with the additional sense code set to ASYMMETRIC
968 * ACCESS STATE CHANGED for the initiator port associated with
969 * every I_T nexus other than the I_T nexus on which the SET
970 * TARGET PORT GROUPS command
971 */
972 if (!percpu_ref_tryget_live(&lun->lun_ref))
973 continue;
974 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
975
976 spin_lock(&lun->lun_deve_lock);
977 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
978 lacl = rcu_dereference_check(se_deve->se_lun_acl,
979 lockdep_is_held(&lun->lun_deve_lock));
980
981 /*
982 * spc4r37 p.242:
983 * After an explicit target port asymmetric access
984 * state change, a device server shall establish a
985 * unit attention condition with the additional sense
986 * code set to ASYMMETRIC ACCESS STATE CHANGED for
987 * the initiator port associated with every I_T nexus
988 * other than the I_T nexus on which the SET TARGET
989 * PORT GROUPS command was received.
990 */
991 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
992 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
993 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
994 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
995 continue;
996
997 /*
998 * se_deve->se_lun_acl pointer may be NULL for a
999 * entry created without explicit Node+MappedLUN ACLs
1000 */
1001 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1002 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
1003 continue;
1004
1005 core_scsi3_ua_allocate(se_deve, 0x2A,
1006 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1007 }
1008 spin_unlock(&lun->lun_deve_lock);
1009
1010 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1011 percpu_ref_put(&lun->lun_ref);
1012 }
1013 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1014 }
1015
1016 static int core_alua_do_transition_tg_pt(
1017 struct t10_alua_tg_pt_gp *tg_pt_gp,
1018 int new_state,
1019 int explicit)
1020 {
1021 int prev_state;
1022
1023 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1024 /* Nothing to be done here */
1025 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
1026 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1027 return 0;
1028 }
1029
1030 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
1031 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1032 return -EAGAIN;
1033 }
1034
1035 /*
1036 * Save the old primary ALUA access state, and set the current state
1037 * to ALUA_ACCESS_STATE_TRANSITION.
1038 */
1039 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
1040 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
1041 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1042 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1043 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1044
1045 core_alua_queue_state_change_ua(tg_pt_gp);
1046
1047 if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
1048 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1049 return 0;
1050 }
1051
1052 /*
1053 * Check for the optional ALUA primary state transition delay
1054 */
1055 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1056 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1057
1058 /*
1059 * Set the current primary ALUA access state to the requested new state
1060 */
1061 tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
1062
1063 /*
1064 * Update the ALUA metadata buf that has been allocated in
1065 * core_alua_do_port_transition(), this metadata will be written
1066 * to struct file.
1067 *
1068 * Note that there is the case where we do not want to update the
1069 * metadata when the saved metadata is being parsed in userspace
1070 * when setting the existing port access state and access status.
1071 *
1072 * Also note that the failure to write out the ALUA metadata to
1073 * struct file does NOT affect the actual ALUA transition.
1074 */
1075 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1076 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1077 }
1078
1079 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1080 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1081 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1082 tg_pt_gp->tg_pt_gp_id,
1083 core_alua_dump_state(prev_state),
1084 core_alua_dump_state(new_state));
1085
1086 core_alua_queue_state_change_ua(tg_pt_gp);
1087
1088 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1089 return 0;
1090 }
1091
1092 int core_alua_do_port_transition(
1093 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1094 struct se_device *l_dev,
1095 struct se_lun *l_lun,
1096 struct se_node_acl *l_nacl,
1097 int new_state,
1098 int explicit)
1099 {
1100 struct se_device *dev;
1101 struct t10_alua_lu_gp *lu_gp;
1102 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1103 struct t10_alua_tg_pt_gp *tg_pt_gp;
1104 int primary, valid_states, rc = 0;
1105
1106 if (l_dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
1107 return -ENODEV;
1108
1109 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1110 if (core_alua_check_transition(new_state, valid_states, &primary,
1111 explicit) != 0)
1112 return -EINVAL;
1113
1114 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1115 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1116 lu_gp = local_lu_gp_mem->lu_gp;
1117 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1118 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1119 /*
1120 * For storage objects that are members of the 'default_lu_gp',
1121 * we only do transition on the passed *l_tp_pt_gp, and not
1122 * on all of the matching target port groups IDs in default_lu_gp.
1123 */
1124 if (!lu_gp->lu_gp_id) {
1125 /*
1126 * core_alua_do_transition_tg_pt() will always return
1127 * success.
1128 */
1129 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1130 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1131 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1132 new_state, explicit);
1133 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1134 return rc;
1135 }
1136 /*
1137 * For all other LU groups aside from 'default_lu_gp', walk all of
1138 * the associated storage objects looking for a matching target port
1139 * group ID from the local target port group.
1140 */
1141 spin_lock(&lu_gp->lu_gp_lock);
1142 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1143 lu_gp_mem_list) {
1144
1145 dev = lu_gp_mem->lu_gp_mem_dev;
1146 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1147 spin_unlock(&lu_gp->lu_gp_lock);
1148
1149 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1150 list_for_each_entry(tg_pt_gp,
1151 &dev->t10_alua.tg_pt_gps_list,
1152 tg_pt_gp_list) {
1153
1154 if (!tg_pt_gp->tg_pt_gp_valid_id)
1155 continue;
1156 /*
1157 * If the target behavior port asymmetric access state
1158 * is changed for any target port group accessible via
1159 * a logical unit within a LU group, the target port
1160 * behavior group asymmetric access states for the same
1161 * target port group accessible via other logical units
1162 * in that LU group will also change.
1163 */
1164 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1165 continue;
1166
1167 if (l_tg_pt_gp == tg_pt_gp) {
1168 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1169 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1170 } else {
1171 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1172 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1173 }
1174 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1175 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1176 /*
1177 * core_alua_do_transition_tg_pt() will always return
1178 * success.
1179 */
1180 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1181 new_state, explicit);
1182
1183 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1184 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1185 if (rc)
1186 break;
1187 }
1188 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1189
1190 spin_lock(&lu_gp->lu_gp_lock);
1191 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1192 }
1193 spin_unlock(&lu_gp->lu_gp_lock);
1194
1195 if (!rc) {
1196 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1197 " Group IDs: %hu %s transition to primary state: %s\n",
1198 config_item_name(&lu_gp->lu_gp_group.cg_item),
1199 l_tg_pt_gp->tg_pt_gp_id,
1200 (explicit) ? "explicit" : "implicit",
1201 core_alua_dump_state(new_state));
1202 }
1203
1204 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1205 return rc;
1206 }
1207
1208 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1209 {
1210 struct se_portal_group *se_tpg = lun->lun_tpg;
1211 unsigned char *md_buf;
1212 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1213 int len, rc;
1214
1215 mutex_lock(&lun->lun_tg_pt_md_mutex);
1216
1217 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1218 if (!md_buf) {
1219 pr_err("Unable to allocate buf for ALUA metadata\n");
1220 rc = -ENOMEM;
1221 goto out_unlock;
1222 }
1223
1224 memset(path, 0, ALUA_METADATA_PATH_LEN);
1225 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1226
1227 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1228 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1229
1230 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1231 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1232 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1233
1234 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1235 "alua_tg_pt_status=0x%02x\n",
1236 atomic_read(&lun->lun_tg_pt_secondary_offline),
1237 lun->lun_tg_pt_secondary_stat);
1238
1239 snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu",
1240 db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1241 lun->unpacked_lun);
1242
1243 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1244 kfree(md_buf);
1245
1246 out_unlock:
1247 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1248 return rc;
1249 }
1250
1251 static int core_alua_set_tg_pt_secondary_state(
1252 struct se_lun *lun,
1253 int explicit,
1254 int offline)
1255 {
1256 struct t10_alua_tg_pt_gp *tg_pt_gp;
1257 int trans_delay_msecs;
1258
1259 spin_lock(&lun->lun_tg_pt_gp_lock);
1260 tg_pt_gp = lun->lun_tg_pt_gp;
1261 if (!tg_pt_gp) {
1262 spin_unlock(&lun->lun_tg_pt_gp_lock);
1263 pr_err("Unable to complete secondary state"
1264 " transition\n");
1265 return -EINVAL;
1266 }
1267 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1268 /*
1269 * Set the secondary ALUA target port access state to OFFLINE
1270 * or release the previously secondary state for struct se_lun
1271 */
1272 if (offline)
1273 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1274 else
1275 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1276
1277 lun->lun_tg_pt_secondary_stat = (explicit) ?
1278 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1279 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1280
1281 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1282 " to secondary access state: %s\n", (explicit) ? "explicit" :
1283 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1284 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1285
1286 spin_unlock(&lun->lun_tg_pt_gp_lock);
1287 /*
1288 * Do the optional transition delay after we set the secondary
1289 * ALUA access state.
1290 */
1291 if (trans_delay_msecs != 0)
1292 msleep_interruptible(trans_delay_msecs);
1293 /*
1294 * See if we need to update the ALUA fabric port metadata for
1295 * secondary state and status
1296 */
1297 if (lun->lun_tg_pt_secondary_write_md)
1298 core_alua_update_tpg_secondary_metadata(lun);
1299
1300 return 0;
1301 }
1302
1303 struct t10_alua_lba_map *
1304 core_alua_allocate_lba_map(struct list_head *list,
1305 u64 first_lba, u64 last_lba)
1306 {
1307 struct t10_alua_lba_map *lba_map;
1308
1309 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1310 if (!lba_map) {
1311 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1312 return ERR_PTR(-ENOMEM);
1313 }
1314 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1315 lba_map->lba_map_first_lba = first_lba;
1316 lba_map->lba_map_last_lba = last_lba;
1317
1318 list_add_tail(&lba_map->lba_map_list, list);
1319 return lba_map;
1320 }
1321
1322 int
1323 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1324 int pg_id, int state)
1325 {
1326 struct t10_alua_lba_map_member *lba_map_mem;
1327
1328 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1329 lba_map_mem_list) {
1330 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1331 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1332 return -EINVAL;
1333 }
1334 }
1335
1336 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1337 if (!lba_map_mem) {
1338 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1339 return -ENOMEM;
1340 }
1341 lba_map_mem->lba_map_mem_alua_state = state;
1342 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1343
1344 list_add_tail(&lba_map_mem->lba_map_mem_list,
1345 &lba_map->lba_map_mem_list);
1346 return 0;
1347 }
1348
1349 void
1350 core_alua_free_lba_map(struct list_head *lba_list)
1351 {
1352 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1353 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1354
1355 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1356 lba_map_list) {
1357 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1358 &lba_map->lba_map_mem_list,
1359 lba_map_mem_list) {
1360 list_del(&lba_map_mem->lba_map_mem_list);
1361 kmem_cache_free(t10_alua_lba_map_mem_cache,
1362 lba_map_mem);
1363 }
1364 list_del(&lba_map->lba_map_list);
1365 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1366 }
1367 }
1368
1369 void
1370 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1371 int segment_size, int segment_mult)
1372 {
1373 struct list_head old_lba_map_list;
1374 struct t10_alua_tg_pt_gp *tg_pt_gp;
1375 int activate = 0, supported;
1376
1377 INIT_LIST_HEAD(&old_lba_map_list);
1378 spin_lock(&dev->t10_alua.lba_map_lock);
1379 dev->t10_alua.lba_map_segment_size = segment_size;
1380 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1381 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1382 if (lba_map_list) {
1383 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1384 activate = 1;
1385 }
1386 spin_unlock(&dev->t10_alua.lba_map_lock);
1387 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1388 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1389 tg_pt_gp_list) {
1390
1391 if (!tg_pt_gp->tg_pt_gp_valid_id)
1392 continue;
1393 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1394 if (activate)
1395 supported |= ALUA_LBD_SUP;
1396 else
1397 supported &= ~ALUA_LBD_SUP;
1398 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1399 }
1400 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1401 core_alua_free_lba_map(&old_lba_map_list);
1402 }
1403
1404 struct t10_alua_lu_gp *
1405 core_alua_allocate_lu_gp(const char *name, int def_group)
1406 {
1407 struct t10_alua_lu_gp *lu_gp;
1408
1409 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1410 if (!lu_gp) {
1411 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1412 return ERR_PTR(-ENOMEM);
1413 }
1414 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1415 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1416 spin_lock_init(&lu_gp->lu_gp_lock);
1417 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1418
1419 if (def_group) {
1420 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1421 lu_gp->lu_gp_valid_id = 1;
1422 alua_lu_gps_count++;
1423 }
1424
1425 return lu_gp;
1426 }
1427
1428 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1429 {
1430 struct t10_alua_lu_gp *lu_gp_tmp;
1431 u16 lu_gp_id_tmp;
1432 /*
1433 * The lu_gp->lu_gp_id may only be set once..
1434 */
1435 if (lu_gp->lu_gp_valid_id) {
1436 pr_warn("ALUA LU Group already has a valid ID,"
1437 " ignoring request\n");
1438 return -EINVAL;
1439 }
1440
1441 spin_lock(&lu_gps_lock);
1442 if (alua_lu_gps_count == 0x0000ffff) {
1443 pr_err("Maximum ALUA alua_lu_gps_count:"
1444 " 0x0000ffff reached\n");
1445 spin_unlock(&lu_gps_lock);
1446 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1447 return -ENOSPC;
1448 }
1449 again:
1450 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1451 alua_lu_gps_counter++;
1452
1453 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1454 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1455 if (!lu_gp_id)
1456 goto again;
1457
1458 pr_warn("ALUA Logical Unit Group ID: %hu"
1459 " already exists, ignoring request\n",
1460 lu_gp_id);
1461 spin_unlock(&lu_gps_lock);
1462 return -EINVAL;
1463 }
1464 }
1465
1466 lu_gp->lu_gp_id = lu_gp_id_tmp;
1467 lu_gp->lu_gp_valid_id = 1;
1468 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1469 alua_lu_gps_count++;
1470 spin_unlock(&lu_gps_lock);
1471
1472 return 0;
1473 }
1474
1475 static struct t10_alua_lu_gp_member *
1476 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1477 {
1478 struct t10_alua_lu_gp_member *lu_gp_mem;
1479
1480 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1481 if (!lu_gp_mem) {
1482 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1483 return ERR_PTR(-ENOMEM);
1484 }
1485 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1486 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1487 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1488
1489 lu_gp_mem->lu_gp_mem_dev = dev;
1490 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1491
1492 return lu_gp_mem;
1493 }
1494
1495 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1496 {
1497 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1498 /*
1499 * Once we have reached this point, config_item_put() has
1500 * already been called from target_core_alua_drop_lu_gp().
1501 *
1502 * Here, we remove the *lu_gp from the global list so that
1503 * no associations can be made while we are releasing
1504 * struct t10_alua_lu_gp.
1505 */
1506 spin_lock(&lu_gps_lock);
1507 list_del(&lu_gp->lu_gp_node);
1508 alua_lu_gps_count--;
1509 spin_unlock(&lu_gps_lock);
1510 /*
1511 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1512 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1513 * released with core_alua_put_lu_gp_from_name()
1514 */
1515 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1516 cpu_relax();
1517 /*
1518 * Release reference to struct t10_alua_lu_gp * from all associated
1519 * struct se_device.
1520 */
1521 spin_lock(&lu_gp->lu_gp_lock);
1522 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1523 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1524 if (lu_gp_mem->lu_gp_assoc) {
1525 list_del(&lu_gp_mem->lu_gp_mem_list);
1526 lu_gp->lu_gp_members--;
1527 lu_gp_mem->lu_gp_assoc = 0;
1528 }
1529 spin_unlock(&lu_gp->lu_gp_lock);
1530 /*
1531 *
1532 * lu_gp_mem is associated with a single
1533 * struct se_device->dev_alua_lu_gp_mem, and is released when
1534 * struct se_device is released via core_alua_free_lu_gp_mem().
1535 *
1536 * If the passed lu_gp does NOT match the default_lu_gp, assume
1537 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1538 */
1539 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1540 if (lu_gp != default_lu_gp)
1541 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1542 default_lu_gp);
1543 else
1544 lu_gp_mem->lu_gp = NULL;
1545 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1546
1547 spin_lock(&lu_gp->lu_gp_lock);
1548 }
1549 spin_unlock(&lu_gp->lu_gp_lock);
1550
1551 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1552 }
1553
1554 void core_alua_free_lu_gp_mem(struct se_device *dev)
1555 {
1556 struct t10_alua_lu_gp *lu_gp;
1557 struct t10_alua_lu_gp_member *lu_gp_mem;
1558
1559 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1560 if (!lu_gp_mem)
1561 return;
1562
1563 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1564 cpu_relax();
1565
1566 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1567 lu_gp = lu_gp_mem->lu_gp;
1568 if (lu_gp) {
1569 spin_lock(&lu_gp->lu_gp_lock);
1570 if (lu_gp_mem->lu_gp_assoc) {
1571 list_del(&lu_gp_mem->lu_gp_mem_list);
1572 lu_gp->lu_gp_members--;
1573 lu_gp_mem->lu_gp_assoc = 0;
1574 }
1575 spin_unlock(&lu_gp->lu_gp_lock);
1576 lu_gp_mem->lu_gp = NULL;
1577 }
1578 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1579
1580 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1581 }
1582
1583 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1584 {
1585 struct t10_alua_lu_gp *lu_gp;
1586 struct config_item *ci;
1587
1588 spin_lock(&lu_gps_lock);
1589 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1590 if (!lu_gp->lu_gp_valid_id)
1591 continue;
1592 ci = &lu_gp->lu_gp_group.cg_item;
1593 if (!strcmp(config_item_name(ci), name)) {
1594 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1595 spin_unlock(&lu_gps_lock);
1596 return lu_gp;
1597 }
1598 }
1599 spin_unlock(&lu_gps_lock);
1600
1601 return NULL;
1602 }
1603
1604 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1605 {
1606 spin_lock(&lu_gps_lock);
1607 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1608 spin_unlock(&lu_gps_lock);
1609 }
1610
1611 /*
1612 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1613 */
1614 void __core_alua_attach_lu_gp_mem(
1615 struct t10_alua_lu_gp_member *lu_gp_mem,
1616 struct t10_alua_lu_gp *lu_gp)
1617 {
1618 spin_lock(&lu_gp->lu_gp_lock);
1619 lu_gp_mem->lu_gp = lu_gp;
1620 lu_gp_mem->lu_gp_assoc = 1;
1621 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1622 lu_gp->lu_gp_members++;
1623 spin_unlock(&lu_gp->lu_gp_lock);
1624 }
1625
1626 /*
1627 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1628 */
1629 void __core_alua_drop_lu_gp_mem(
1630 struct t10_alua_lu_gp_member *lu_gp_mem,
1631 struct t10_alua_lu_gp *lu_gp)
1632 {
1633 spin_lock(&lu_gp->lu_gp_lock);
1634 list_del(&lu_gp_mem->lu_gp_mem_list);
1635 lu_gp_mem->lu_gp = NULL;
1636 lu_gp_mem->lu_gp_assoc = 0;
1637 lu_gp->lu_gp_members--;
1638 spin_unlock(&lu_gp->lu_gp_lock);
1639 }
1640
1641 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1642 const char *name, int def_group)
1643 {
1644 struct t10_alua_tg_pt_gp *tg_pt_gp;
1645
1646 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1647 if (!tg_pt_gp) {
1648 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1649 return NULL;
1650 }
1651 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1652 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1653 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
1654 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1655 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1656 tg_pt_gp->tg_pt_gp_dev = dev;
1657 tg_pt_gp->tg_pt_gp_alua_access_state =
1658 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
1659 /*
1660 * Enable both explicit and implicit ALUA support by default
1661 */
1662 tg_pt_gp->tg_pt_gp_alua_access_type =
1663 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1664 /*
1665 * Set the default Active/NonOptimized Delay in milliseconds
1666 */
1667 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1668 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1669 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1670
1671 /*
1672 * Enable all supported states
1673 */
1674 tg_pt_gp->tg_pt_gp_alua_supported_states =
1675 ALUA_T_SUP | ALUA_O_SUP |
1676 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1677
1678 if (def_group) {
1679 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1680 tg_pt_gp->tg_pt_gp_id =
1681 dev->t10_alua.alua_tg_pt_gps_counter++;
1682 tg_pt_gp->tg_pt_gp_valid_id = 1;
1683 dev->t10_alua.alua_tg_pt_gps_count++;
1684 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1685 &dev->t10_alua.tg_pt_gps_list);
1686 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1687 }
1688
1689 return tg_pt_gp;
1690 }
1691
1692 int core_alua_set_tg_pt_gp_id(
1693 struct t10_alua_tg_pt_gp *tg_pt_gp,
1694 u16 tg_pt_gp_id)
1695 {
1696 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1697 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1698 u16 tg_pt_gp_id_tmp;
1699
1700 /*
1701 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1702 */
1703 if (tg_pt_gp->tg_pt_gp_valid_id) {
1704 pr_warn("ALUA TG PT Group already has a valid ID,"
1705 " ignoring request\n");
1706 return -EINVAL;
1707 }
1708
1709 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1710 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1711 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1712 " 0x0000ffff reached\n");
1713 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1714 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1715 return -ENOSPC;
1716 }
1717 again:
1718 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1719 dev->t10_alua.alua_tg_pt_gps_counter++;
1720
1721 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1722 tg_pt_gp_list) {
1723 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1724 if (!tg_pt_gp_id)
1725 goto again;
1726
1727 pr_err("ALUA Target Port Group ID: %hu already"
1728 " exists, ignoring request\n", tg_pt_gp_id);
1729 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1730 return -EINVAL;
1731 }
1732 }
1733
1734 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1735 tg_pt_gp->tg_pt_gp_valid_id = 1;
1736 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1737 &dev->t10_alua.tg_pt_gps_list);
1738 dev->t10_alua.alua_tg_pt_gps_count++;
1739 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1740
1741 return 0;
1742 }
1743
1744 void core_alua_free_tg_pt_gp(
1745 struct t10_alua_tg_pt_gp *tg_pt_gp)
1746 {
1747 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1748 struct se_lun *lun, *next;
1749
1750 /*
1751 * Once we have reached this point, config_item_put() has already
1752 * been called from target_core_alua_drop_tg_pt_gp().
1753 *
1754 * Here we remove *tg_pt_gp from the global list so that
1755 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1756 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1757 */
1758 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1759 list_del(&tg_pt_gp->tg_pt_gp_list);
1760 dev->t10_alua.alua_tg_pt_gps_counter--;
1761 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1762
1763 /*
1764 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1765 * core_alua_get_tg_pt_gp_by_name() in
1766 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1767 * to be released with core_alua_put_tg_pt_gp_from_name().
1768 */
1769 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1770 cpu_relax();
1771
1772 /*
1773 * Release reference to struct t10_alua_tg_pt_gp from all associated
1774 * struct se_port.
1775 */
1776 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1777 list_for_each_entry_safe(lun, next,
1778 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1779 list_del_init(&lun->lun_tg_pt_gp_link);
1780 tg_pt_gp->tg_pt_gp_members--;
1781
1782 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1783 /*
1784 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1785 * assume we want to re-associate a given tg_pt_gp_mem with
1786 * default_tg_pt_gp.
1787 */
1788 spin_lock(&lun->lun_tg_pt_gp_lock);
1789 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1790 __target_attach_tg_pt_gp(lun,
1791 dev->t10_alua.default_tg_pt_gp);
1792 } else
1793 lun->lun_tg_pt_gp = NULL;
1794 spin_unlock(&lun->lun_tg_pt_gp_lock);
1795
1796 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1797 }
1798 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1799
1800 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1801 }
1802
1803 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1804 struct se_device *dev, const char *name)
1805 {
1806 struct t10_alua_tg_pt_gp *tg_pt_gp;
1807 struct config_item *ci;
1808
1809 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1810 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1811 tg_pt_gp_list) {
1812 if (!tg_pt_gp->tg_pt_gp_valid_id)
1813 continue;
1814 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1815 if (!strcmp(config_item_name(ci), name)) {
1816 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1817 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1818 return tg_pt_gp;
1819 }
1820 }
1821 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1822
1823 return NULL;
1824 }
1825
1826 static void core_alua_put_tg_pt_gp_from_name(
1827 struct t10_alua_tg_pt_gp *tg_pt_gp)
1828 {
1829 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1830
1831 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1832 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1833 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1834 }
1835
1836 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1837 struct t10_alua_tg_pt_gp *tg_pt_gp)
1838 {
1839 struct se_dev_entry *se_deve;
1840
1841 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1842
1843 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1844 lun->lun_tg_pt_gp = tg_pt_gp;
1845 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1846 tg_pt_gp->tg_pt_gp_members++;
1847 spin_lock(&lun->lun_deve_lock);
1848 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1849 core_scsi3_ua_allocate(se_deve, 0x3f,
1850 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1851 spin_unlock(&lun->lun_deve_lock);
1852 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1853 }
1854
1855 void target_attach_tg_pt_gp(struct se_lun *lun,
1856 struct t10_alua_tg_pt_gp *tg_pt_gp)
1857 {
1858 spin_lock(&lun->lun_tg_pt_gp_lock);
1859 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1860 spin_unlock(&lun->lun_tg_pt_gp_lock);
1861 }
1862
1863 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1864 struct t10_alua_tg_pt_gp *tg_pt_gp)
1865 {
1866 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1867
1868 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1869 list_del_init(&lun->lun_tg_pt_gp_link);
1870 tg_pt_gp->tg_pt_gp_members--;
1871 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1872
1873 lun->lun_tg_pt_gp = NULL;
1874 }
1875
1876 void target_detach_tg_pt_gp(struct se_lun *lun)
1877 {
1878 struct t10_alua_tg_pt_gp *tg_pt_gp;
1879
1880 spin_lock(&lun->lun_tg_pt_gp_lock);
1881 tg_pt_gp = lun->lun_tg_pt_gp;
1882 if (tg_pt_gp)
1883 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1884 spin_unlock(&lun->lun_tg_pt_gp_lock);
1885 }
1886
1887 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1888 {
1889 struct config_item *tg_pt_ci;
1890 struct t10_alua_tg_pt_gp *tg_pt_gp;
1891 ssize_t len = 0;
1892
1893 spin_lock(&lun->lun_tg_pt_gp_lock);
1894 tg_pt_gp = lun->lun_tg_pt_gp;
1895 if (tg_pt_gp) {
1896 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1897 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1898 " %hu\nTG Port Primary Access State: %s\nTG Port "
1899 "Primary Access Status: %s\nTG Port Secondary Access"
1900 " State: %s\nTG Port Secondary Access Status: %s\n",
1901 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1902 core_alua_dump_state(
1903 tg_pt_gp->tg_pt_gp_alua_access_state),
1904 core_alua_dump_status(
1905 tg_pt_gp->tg_pt_gp_alua_access_status),
1906 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1907 "Offline" : "None",
1908 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1909 }
1910 spin_unlock(&lun->lun_tg_pt_gp_lock);
1911
1912 return len;
1913 }
1914
1915 ssize_t core_alua_store_tg_pt_gp_info(
1916 struct se_lun *lun,
1917 const char *page,
1918 size_t count)
1919 {
1920 struct se_portal_group *tpg = lun->lun_tpg;
1921 /*
1922 * rcu_dereference_raw protected by se_lun->lun_group symlink
1923 * reference to se_device->dev_group.
1924 */
1925 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1926 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1927 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1928 int move = 0;
1929
1930 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
1931 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1932 return -ENODEV;
1933
1934 if (count > TG_PT_GROUP_NAME_BUF) {
1935 pr_err("ALUA Target Port Group alias too large!\n");
1936 return -EINVAL;
1937 }
1938 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1939 memcpy(buf, page, count);
1940 /*
1941 * Any ALUA target port group alias besides "NULL" means we will be
1942 * making a new group association.
1943 */
1944 if (strcmp(strstrip(buf), "NULL")) {
1945 /*
1946 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1947 * struct t10_alua_tg_pt_gp. This reference is released with
1948 * core_alua_put_tg_pt_gp_from_name() below.
1949 */
1950 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1951 strstrip(buf));
1952 if (!tg_pt_gp_new)
1953 return -ENODEV;
1954 }
1955
1956 spin_lock(&lun->lun_tg_pt_gp_lock);
1957 tg_pt_gp = lun->lun_tg_pt_gp;
1958 if (tg_pt_gp) {
1959 /*
1960 * Clearing an existing tg_pt_gp association, and replacing
1961 * with the default_tg_pt_gp.
1962 */
1963 if (!tg_pt_gp_new) {
1964 pr_debug("Target_Core_ConfigFS: Moving"
1965 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1966 " alua/%s, ID: %hu back to"
1967 " default_tg_pt_gp\n",
1968 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1969 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1970 config_item_name(&lun->lun_group.cg_item),
1971 config_item_name(
1972 &tg_pt_gp->tg_pt_gp_group.cg_item),
1973 tg_pt_gp->tg_pt_gp_id);
1974
1975 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1976 __target_attach_tg_pt_gp(lun,
1977 dev->t10_alua.default_tg_pt_gp);
1978 spin_unlock(&lun->lun_tg_pt_gp_lock);
1979
1980 return count;
1981 }
1982 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1983 move = 1;
1984 }
1985
1986 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
1987 spin_unlock(&lun->lun_tg_pt_gp_lock);
1988 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1989 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1990 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1991 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1992 config_item_name(&lun->lun_group.cg_item),
1993 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1994 tg_pt_gp_new->tg_pt_gp_id);
1995
1996 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1997 return count;
1998 }
1999
2000 ssize_t core_alua_show_access_type(
2001 struct t10_alua_tg_pt_gp *tg_pt_gp,
2002 char *page)
2003 {
2004 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2005 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2006 return sprintf(page, "Implicit and Explicit\n");
2007 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2008 return sprintf(page, "Implicit\n");
2009 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2010 return sprintf(page, "Explicit\n");
2011 else
2012 return sprintf(page, "None\n");
2013 }
2014
2015 ssize_t core_alua_store_access_type(
2016 struct t10_alua_tg_pt_gp *tg_pt_gp,
2017 const char *page,
2018 size_t count)
2019 {
2020 unsigned long tmp;
2021 int ret;
2022
2023 ret = kstrtoul(page, 0, &tmp);
2024 if (ret < 0) {
2025 pr_err("Unable to extract alua_access_type\n");
2026 return ret;
2027 }
2028 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2029 pr_err("Illegal value for alua_access_type:"
2030 " %lu\n", tmp);
2031 return -EINVAL;
2032 }
2033 if (tmp == 3)
2034 tg_pt_gp->tg_pt_gp_alua_access_type =
2035 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2036 else if (tmp == 2)
2037 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2038 else if (tmp == 1)
2039 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2040 else
2041 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2042
2043 return count;
2044 }
2045
2046 ssize_t core_alua_show_nonop_delay_msecs(
2047 struct t10_alua_tg_pt_gp *tg_pt_gp,
2048 char *page)
2049 {
2050 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2051 }
2052
2053 ssize_t core_alua_store_nonop_delay_msecs(
2054 struct t10_alua_tg_pt_gp *tg_pt_gp,
2055 const char *page,
2056 size_t count)
2057 {
2058 unsigned long tmp;
2059 int ret;
2060
2061 ret = kstrtoul(page, 0, &tmp);
2062 if (ret < 0) {
2063 pr_err("Unable to extract nonop_delay_msecs\n");
2064 return ret;
2065 }
2066 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2067 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2068 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2069 ALUA_MAX_NONOP_DELAY_MSECS);
2070 return -EINVAL;
2071 }
2072 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2073
2074 return count;
2075 }
2076
2077 ssize_t core_alua_show_trans_delay_msecs(
2078 struct t10_alua_tg_pt_gp *tg_pt_gp,
2079 char *page)
2080 {
2081 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2082 }
2083
2084 ssize_t core_alua_store_trans_delay_msecs(
2085 struct t10_alua_tg_pt_gp *tg_pt_gp,
2086 const char *page,
2087 size_t count)
2088 {
2089 unsigned long tmp;
2090 int ret;
2091
2092 ret = kstrtoul(page, 0, &tmp);
2093 if (ret < 0) {
2094 pr_err("Unable to extract trans_delay_msecs\n");
2095 return ret;
2096 }
2097 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2098 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2099 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2100 ALUA_MAX_TRANS_DELAY_MSECS);
2101 return -EINVAL;
2102 }
2103 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2104
2105 return count;
2106 }
2107
2108 ssize_t core_alua_show_implicit_trans_secs(
2109 struct t10_alua_tg_pt_gp *tg_pt_gp,
2110 char *page)
2111 {
2112 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2113 }
2114
2115 ssize_t core_alua_store_implicit_trans_secs(
2116 struct t10_alua_tg_pt_gp *tg_pt_gp,
2117 const char *page,
2118 size_t count)
2119 {
2120 unsigned long tmp;
2121 int ret;
2122
2123 ret = kstrtoul(page, 0, &tmp);
2124 if (ret < 0) {
2125 pr_err("Unable to extract implicit_trans_secs\n");
2126 return ret;
2127 }
2128 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2129 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2130 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2131 ALUA_MAX_IMPLICIT_TRANS_SECS);
2132 return -EINVAL;
2133 }
2134 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2135
2136 return count;
2137 }
2138
2139 ssize_t core_alua_show_preferred_bit(
2140 struct t10_alua_tg_pt_gp *tg_pt_gp,
2141 char *page)
2142 {
2143 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2144 }
2145
2146 ssize_t core_alua_store_preferred_bit(
2147 struct t10_alua_tg_pt_gp *tg_pt_gp,
2148 const char *page,
2149 size_t count)
2150 {
2151 unsigned long tmp;
2152 int ret;
2153
2154 ret = kstrtoul(page, 0, &tmp);
2155 if (ret < 0) {
2156 pr_err("Unable to extract preferred ALUA value\n");
2157 return ret;
2158 }
2159 if ((tmp != 0) && (tmp != 1)) {
2160 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2161 return -EINVAL;
2162 }
2163 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2164
2165 return count;
2166 }
2167
2168 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2169 {
2170 return sprintf(page, "%d\n",
2171 atomic_read(&lun->lun_tg_pt_secondary_offline));
2172 }
2173
2174 ssize_t core_alua_store_offline_bit(
2175 struct se_lun *lun,
2176 const char *page,
2177 size_t count)
2178 {
2179 /*
2180 * rcu_dereference_raw protected by se_lun->lun_group symlink
2181 * reference to se_device->dev_group.
2182 */
2183 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2184 unsigned long tmp;
2185 int ret;
2186
2187 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
2188 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2189 return -ENODEV;
2190
2191 ret = kstrtoul(page, 0, &tmp);
2192 if (ret < 0) {
2193 pr_err("Unable to extract alua_tg_pt_offline value\n");
2194 return ret;
2195 }
2196 if ((tmp != 0) && (tmp != 1)) {
2197 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2198 tmp);
2199 return -EINVAL;
2200 }
2201
2202 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2203 if (ret < 0)
2204 return -EINVAL;
2205
2206 return count;
2207 }
2208
2209 ssize_t core_alua_show_secondary_status(
2210 struct se_lun *lun,
2211 char *page)
2212 {
2213 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2214 }
2215
2216 ssize_t core_alua_store_secondary_status(
2217 struct se_lun *lun,
2218 const char *page,
2219 size_t count)
2220 {
2221 unsigned long tmp;
2222 int ret;
2223
2224 ret = kstrtoul(page, 0, &tmp);
2225 if (ret < 0) {
2226 pr_err("Unable to extract alua_tg_pt_status\n");
2227 return ret;
2228 }
2229 if ((tmp != ALUA_STATUS_NONE) &&
2230 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2231 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2232 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2233 tmp);
2234 return -EINVAL;
2235 }
2236 lun->lun_tg_pt_secondary_stat = (int)tmp;
2237
2238 return count;
2239 }
2240
2241 ssize_t core_alua_show_secondary_write_metadata(
2242 struct se_lun *lun,
2243 char *page)
2244 {
2245 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2246 }
2247
2248 ssize_t core_alua_store_secondary_write_metadata(
2249 struct se_lun *lun,
2250 const char *page,
2251 size_t count)
2252 {
2253 unsigned long tmp;
2254 int ret;
2255
2256 ret = kstrtoul(page, 0, &tmp);
2257 if (ret < 0) {
2258 pr_err("Unable to extract alua_tg_pt_write_md\n");
2259 return ret;
2260 }
2261 if ((tmp != 0) && (tmp != 1)) {
2262 pr_err("Illegal value for alua_tg_pt_write_md:"
2263 " %lu\n", tmp);
2264 return -EINVAL;
2265 }
2266 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2267
2268 return count;
2269 }
2270
2271 int core_setup_alua(struct se_device *dev)
2272 {
2273 if (!(dev->transport->transport_flags &
2274 TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
2275 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2276 struct t10_alua_lu_gp_member *lu_gp_mem;
2277
2278 /*
2279 * Associate this struct se_device with the default ALUA
2280 * LUN Group.
2281 */
2282 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2283 if (IS_ERR(lu_gp_mem))
2284 return PTR_ERR(lu_gp_mem);
2285
2286 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2287 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2288 default_lu_gp);
2289 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2290
2291 pr_debug("%s: Adding to default ALUA LU Group:"
2292 " core/alua/lu_gps/default_lu_gp\n",
2293 dev->transport->name);
2294 }
2295
2296 return 0;
2297 }
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